JP3410664B2 - Liquid crystal display - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used in office automation equipment such as word processors and personal computers, portable information equipment such as an electronic notebook, or a camera-integrated VTR equipped with a liquid crystal monitor.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices are characterized by their thinness and low power consumption, so that OA devices such as word processors and personal computers, portable information devices such as electronic notebooks, or cameras equipped with a liquid crystal monitor are available. Widely used in integrated VTRs.

In such a liquid crystal display device, a transmissive liquid crystal display device using a transparent conductive thin film such as ITO (Indium Tin Oxide) for a pixel electrode, and a reflection using a reflective electrode such as a metal for the pixel electrode. Type liquid crystal display device.

Originally, a liquid crystal display device is not a self-luminous display device which emits light by itself unlike a CRT (CRT) or EL (electroluminescence). Therefore, in the case of a transmissive liquid crystal display device, a liquid crystal display device is used. Arrange a lighting device such as a fluorescent tube, a so-called backlight, behind the device,
Display is performed by the light incident from there. Further, in the case of a reflective liquid crystal display device, display is performed by reflecting incident light from the outside with a reflective electrode.

Here, in the case of a transmissive liquid crystal display device,
In order to display using the backlight as described above,
Although it has the advantage of being able to perform a bright and high-contrast display without being significantly affected by the ambient brightness, a backlight normally consumes 50% or more of the total power consumption of a liquid crystal display device. From consuming,
There is also a problem that power consumption increases.

Further, in the case of the reflection type liquid crystal display device, since the backlight is not used as described above, it has an advantage that the power consumption can be made extremely small, but the brightness of the surroundings and the like. There is also a problem that the brightness and contrast of the display are affected by the usage environment or usage conditions.

As described above, the reflection type liquid crystal display device has a drawback that the visibility is extremely deteriorated in a use environment such as ambient brightness, especially when the external light is dark. On the other hand, the transmissive liquid crystal display device, on the other hand, has a problem in that when external light is extremely bright, the visibility is deteriorated, for example, in fine weather.

The inventors of the present invention have proposed a patent application for a liquid crystal display device having both reflective and transmissive functions as a means for solving these problems. (Japanese Patent Application No. 9-201176) In the liquid crystal display device proposed by this patent application, by forming a reflection portion that reflects external light and a transmission portion that transmits light from the backlight in one display pixel, As a transmissive liquid crystal display device that uses the light transmitted through the transmissive part from the backlight for display when the surroundings are pitch dark, and when the outside light is dark, transmits the transmissive part from the backlight. As a dual-purpose liquid crystal display device that performs display by using both the light that is reflected and the light that is reflected by the reflection portion formed of a film having a relatively high light reflectance, and when the outside light is bright, the light reflectance Is a transmissive / reflective liquid crystal display device having a configuration such that it can be used as a reflective liquid crystal display device that performs display by utilizing light reflected by a reflecting portion formed of a relatively high film.

[0009]

The liquid crystal display device having such a structure makes it possible to provide a liquid crystal display device which is always excellent in visibility regardless of the brightness of external light. In order to realize a bright color display with high color purity for both the reflective type and the reflective type, there are various problems as described below.

For example, when a general color filter that has been conventionally used is arranged in the above-mentioned transflective liquid crystal display device, the light from the backlight is transmitted through the color filter corresponding to the transmitting portion. However, since the color filter corresponding to the reflective portion transmits the external light twice when the external light enters and when the external light exits, both the transmissive type and the reflective type are bright and have high color purity. It has been very difficult to realize color display.

This is because the transmittance of the color filter in a normal transmissive liquid crystal display device is about 3 after the visibility correction.
Since it is 2%, if this is used as it is as a color filter in a reflection type liquid crystal display device, the transmittance will be about 11%, resulting in a very dark display.

In Japanese Patent Laid-Open No. 8-286178, as a liquid crystal display device for realizing a bright color display with high color purity, a colored portion of a color filter is divided into islands in one pixel, and openings are formed around the colored portion. A configuration for forming a part (a part without coloring) is disclosed.

However, this publication also only discloses the structure of the color filter in the transmissive liquid crystal display device or the reflective liquid crystal display device, and a reflection portion and a backlight for reflecting external light to one display pixel. The optimum color filter configuration in the liquid crystal display device in which the transmission part that transmits the light from is built in, that is, the characteristics and arrangement relationship of the colored part and the opening part are not disclosed at all, and disclosed in this publication. Even if the color filter forming technology is directly applied to a liquid crystal display device in which a reflective portion and a transmissive portion are formed in one display pixel, a pale display with poor color purity is obtained, and both the transmissive portion and the reflective portion are displayed. It is very difficult to realize a color filter that enables bright, high-purity color display.

The present invention has been made in view of the problems relating to the formation of the color filter in the above-mentioned reflective type or transflective type liquid crystal display device, and the object thereof is a reflective type or transmissive type. A case where a color filter in a reflective dual-use liquid crystal display device is formed without increasing the number of processes as compared with a color filter in a conventional liquid crystal display device, and a misalignment between the pixel electrode region and the color filter region occurs. Another object of the present invention is to provide a liquid crystal display device which realizes bright color display with high color purity.

[0015]

A liquid crystal display device according to the present invention has a structure in which an external light is reflected on one substrate of a pair of substrates which are bonded to face each other with a liquid crystal layer interposed therebetween.
Within one pixel, the projection part and the transmissive part that transmits the light from the back light source
In a liquid crystal display device in which a pixel electrode is formed, and a color filter is formed on the other substrate of the pair of substrates, a region corresponding to the reflection portion on the other substrate. Is composed of an area in which a color filter is formed and an area in which a color filter is not formed, and the color filter is formed even when a misalignment between the pixel electrode area and the color filter forming area occurs. The color filter is formed so that the area of the region where the color filter is not formed is constant, whereby the above object is achieved.

[0016]

At this time, it is preferable that the region corresponding to the transmitting portion on the other side substrate is constituted by a region where a color filter is formed.

Further, at this time, and the color filter over is formed region, the boundary between the color filter over is not formed region, it is desirable that the black mask is formed.

The operation of the present invention will be briefly described below.

According to the present invention, the reflective electrode is formed on one of the pair of substrates which are bonded to face each other with the liquid crystal layer interposed therebetween, and the other side of the pair of substrates is formed. In the area corresponding to the reflective electrode on the substrate,
In a liquid crystal display device in which a region where a color filter is formed and a region where a color filter is not formed are formed, this color filter is provided when a bonding displacement between the reflective electrode region and the color filter forming region occurs. In addition, since the area where the color filter is not formed is formed to be constant, the variation in the finish of the color filter edge portion at the time of making the color filter and the substrate Even when the bonding error occurs, it is possible to minimize variations in optical characteristics such as brightness and color tone of the liquid crystal display device.

In addition, in a liquid crystal display device in which a pixel electrode is formed in which a reflection portion that reflects external light and a transmission portion that transmits light from a back light source are formed in one pixel, the liquid crystal display device on the other side substrate is formed. By configuring the area corresponding to the transmissive portion with the area where the color filter is formed, it is possible to perform display with high color purity.

Further, by forming a black mask having a line width wider than the variation in the finish of the color filter edge portion at the boundary between the area where the color filter is formed and the area where the color filter is not formed, Even when variations occur in the finish at the color filter edge portion, it is possible to minimize variations in display characteristics such as color purity and contrast.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The features of the embodiments of the present invention will be described below with reference to the drawings together with comparative examples.

(Comparative Example 1) In order to facilitate the description of the embodiment of the present invention, a liquid crystal display device in Comparative Example 1 of the present invention will be described with reference to the drawings. Figure 1 (a)
FIG. 1B is an enlarged plan view showing a pixel electrode portion of a reflective liquid crystal display device in Comparative Example 1 of the present invention, and FIG.
It is an expanded sectional view showing the section of the AA 'line in (a).

In addition, an enlarged plan view showing a pixel electrode portion of a conventional reflective liquid crystal display device is also shown in FIG.
2B is an enlarged cross-sectional view showing a cross section taken along the line AA ′ in FIG.

In FIGS. 1 and 2, components other than the color filters 11A, 11B and 11C and the reflective electrode 3 which is a pixel electrode are omitted. Further, the shape of the reflective electrode 3 does not have to be the rectangular shape shown in the drawing.

First, a conventional reflective liquid crystal display device will be described with reference to FIG. As shown in FIGS. 2A and 2B, a reflective electrode 3 is formed in a predetermined shape on the lower substrate 1, and a color filter 11A, which is opposed to the reflective electrode 3, is formed on the color filter substrate 2. 11B and 11C and the transparent electrode 4 are formed respectively. A liquid crystal layer 5 is sandwiched between the reflective electrode 3 and the transparent electrode 4 formed on the lower substrate 1 and the color filter substrate 2.

Generally, in a liquid crystal display device, in order to display various colors, three color filters of red (R), green (G) and blue (B) are arranged side by side on one substrate, A method of mixing colors by controlling the voltage applied to the liquid crystal layer 5 by the amount of light passing through these is used (additive color mixing method).

However, in a color filter used in a transmissive liquid crystal display device, when three colors of R, G and B are uniformly mixed, white (W) is obtained and a transmittance of about 32% is obtained. However, when the color filter used in this transmissive liquid crystal display device is used as it is in a reflective or transflective liquid crystal display device, light is displayed twice in the reflective area when the light is passed through the color filter. It has been found that only the brightness of about 11% can be obtained with the same white display because it passes.

Here, in order to improve the brightness of white display in display in a reflective area in a reflective or transflective liquid crystal display device, in comparison with a color filter used in a transmissive liquid crystal display device. There are known methods such as reducing the film thickness of the color filter or the amount of pigment dispersed in the resin, or using a completely new pigment.These methods are the same as those of the transmissive liquid crystal display device. Since you can't use color filters,
It was a big factor in cost increase.

Further, when the above-mentioned color filter is used in the transflective liquid crystal display device, white display is performed in the reflective region as compared with the case where the color filter used in the transmissive liquid crystal display device is used. However, there is also a problem in that the color purity is significantly reduced in the transmissive region although the brightness is improved.

Here, Comparative Example 1 of the present invention will be described with reference to FIG. As shown in FIGS. 1A and 1B, a reflective electrode 3 is formed in a predetermined shape on a lower substrate 1, and a color filter 11A, which is opposed to the reflective electrode 3, is formed on a color filter substrate 2. 11B and 11C and the transparent electrode 4 are formed respectively. The reflective electrode 3 formed on the lower substrate 1 and the color filter substrate 2
A liquid crystal layer 5 is sandwiched between the transparent electrode 4 and the transparent electrode 4.

In Comparative Example 1, as shown in FIG. 1A, the reflective electrode 3 on the color filter substrate 2 is replaced with the conventional method for adjusting the material and film thickness of the color filter as described above. In the region corresponding to (1), a color filter for a transmissive liquid crystal display device having high color purity is formed, and a region (B) where no color filter is formed is provided. Then, white is displayed in the area (B) in which the color filter is not formed and mixed with the color filter having a high color purity, so that the reflective area in the reflective liquid crystal display device or the transflective liquid crystal display device is displayed. It has become possible to realize the bright display required for.

Although a reflective liquid crystal display device in which the pixel electrodes 3 are all reflective regions has been described as Comparative Example 1, a transmissive region 8 and a reflective region are formed in a part of the pixel electrode as shown in FIG. 3, for example. The same applies to the case of a transflective liquid crystal display device having the above-mentioned 3 and 3.

(Embodiment 1) Here, a liquid crystal display device according to Embodiment 1 of the present invention will be described with reference to the drawings. 5A to 5D are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the first embodiment.

Although not shown, the liquid crystal display device according to the first embodiment has a reflective electrode 3 formed in a predetermined shape on a lower substrate 1 and a color filter substrate 2 facing the reflective electrode 3. The color filter 11 and the transparent electrode 4 are formed. A liquid crystal layer 5 is sandwiched between the reflective electrode 3 and the transparent electrode 4 formed on the lower substrate 1 and the color filter substrate 2.

In the first embodiment, as shown in FIG. 5A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the reflective electrode 3 on the color filter substrate 2. In addition, areas (C1) and (C2) where no color filter is formed are provided. Then, a region (C
By displaying white by 1) and (C2) and mixing with a color filter having high color purity, a bright display necessary for a reflective region in a reflective liquid crystal display device or a transflective liquid crystal display device is realized. It is possible.

The structure shown in FIG. 5A shows a case where the lower substrate 1 and the color filter substrate 2 are bonded to each other with the accuracy as designed, and the reflection type liquid crystal display device at this time is The color filter 11 on the color filter substrate 2 and the reflective electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 5B shows the lower substrate 1
3 shows a case where the color filter substrate 2 is attached in the direction of the arrow while being displaced. At this time, the color filter 11 on the color filter substrate 2 of the reflective liquid crystal display device and the reflective electrode on the substrate 1 facing the color filter 11 are shown. 3 and 3.

Here, in the manufacturing process of the liquid crystal display device according to the first embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Even if the color filter substrate 2 is deviated in the direction of the arrow with respect to 1 and is bonded, the color filter 1
The total area S (C ′) of the regions (C1 ′) and (C2 ′) in which 1 is not formed is the same as that of the lower substrate 1 and the color filter substrate 2 as designed as shown in FIG. When compared with the total area S (C) of the areas (C1) and (C2) where the color filter 11 is not formed when S is attached, S (C ′) = (C1 ′) + (C2 ′) S ( C) = (C1) + (C2) S (C ′) = S (C), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the first embodiment has a region where the color filter is not formed, and
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

However, as shown in FIG. 5 (c), when the lower substrate 1 and the color filter substrate 2 are attached to each other, the displacement of the attachment is large, and the color filter 11 shown in FIG. 5 (a) is formed. When C2 in the non-existing region is not present, the area S (C ″) of the region (C1 ″) in which the color filter 11 is not formed is S (C ″) = (C1 ″) S ( C ″)> S (C), and the chromaticity and brightness of the liquid crystal display device change.

Therefore, in the first embodiment, a pattern that does not cause the state shown in FIG. 5C is determined in consideration of the substrate bonding accuracy in the liquid crystal process in the production of the liquid crystal display device. It is desirable to keep.

In the first embodiment, as shown in FIG. 5D, the transmissive region 8 and the reflective region 3 are formed in a part of the pixel electrode.
The same effect can be obtained also in the case of a transflective liquid crystal display device having and.

However, in the case of a transflective liquid crystal display device, the lower substrate 1 and the color filter substrate 2 are used.
If there is a misalignment when pasting and
If the area on the color filter substrate 2 where the color filter 11 is not formed overlaps the transmissive area 8 of the pixel electrode, the chromaticity and brightness of the transmissive area 8 change, and thus in such a case as well, It is desirable to determine a pattern in which the region where the color filter 11 is not formed does not overlap the transmissive region 8 of the pixel electrode in consideration of the substrate bonding accuracy in the liquid crystal process in the production of the liquid crystal display device.

Here, in the case where the lower substrate 1 and the color filter substrate 2 are bonded to each other in the liquid crystal display device having the color filter pattern as shown in the above-described Comparative Example 1, A brief description will be given below.

FIG. 4A shows the color filter 11 and the reflective electrode 3 of the reflective liquid crystal display device in which the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed. is there. Further, FIG. 4B shows the color filter 11 and the reflective electrode 3 of the reflective liquid crystal display device in a state where the color filter substrate 2 is attached to the lower substrate 1 while being displaced in the arrow direction. is there.

Here, in the manufacturing process of the liquid crystal display device in Comparative Example 1 described above, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. When the color filter substrate 2 is deviated in the direction of the arrow with respect to 1 and is attached, the color filter 1
The area of the region S (B ′) in which 1 is not formed is shown in FIG.
Compared with the area of the region S (B) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in (b), S (B ′) <S (B), and therefore, in the liquid crystal display device in Comparative Example 1 described above, when the misalignment of the substrates occurs, the chromaticity and brightness of the liquid crystal display device change. Become.

Comparative Example 2 Next, a liquid crystal display device in Comparative Example 2 of the present invention will be described with reference to the drawings. Figure 6
FIG. 6A is an enlarged plan view showing a pixel electrode portion of a transflective liquid crystal display device in Comparative Example 2 of the present invention.

In Comparative Example 2, as shown in FIG. 6A, a color filter 11 for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. And color filter 1
The feature is that the regions (D1) and (D2) where 1 is not formed are provided. And this color filter 1
By displaying white in the areas (D1) and (D2) where 1 is not formed and mixing the colors with the color filter 11 having high color purity, a bright display necessary for the reflective area in the transflective liquid crystal display device can be obtained. It is possible to realize.

The structure shown in FIG. 6A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the transflective liquid crystal of this type is used. Color filter substrate 2 in display device
The upper color filter 11 and the reflection area 3 and the transmission area 8 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 6B shows the lower substrate 1
2 shows a case where the color filter substrate 2 is bonded in the direction of the arrow while being displaced. At this time, the color filter 11 on the color filter substrate 2 in the transflective liquid crystal display device and the substrate 1 facing it. The reflective area 3 and the transmissive area 8 are shown.

Here, in the manufacturing process of the liquid crystal display device in Comparative Example 2, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. When the color filter substrate 2 is attached while being displaced in the direction of the arrow, the color filter 11
The total area S (D ′) of the reflection regions (D1 ′) and (D2 ′) in which the pattern is not formed is the same as that of the lower substrate 1 and the color filter substrate 2 as designed as shown in FIG. When compared with the total area S (D) of the regions (D1) and (D2) where the color filter 11 is not formed when S is attached, S (D ′) = (D1 ′) + (D2 ′) − ( D3 ′) S (D) = (D1) + (D2) S (D ′) <S (D), and therefore, in the liquid crystal display device in Comparative Example 2 described above, the substrate is misaligned. Then, the chromaticity and brightness of the liquid crystal display device will change.

This is a transflective liquid crystal display device in which the liquid crystal display device in Comparative Example 2 has a transmissive region 8 and a reflective region 3 in a part of a pixel electrode, as shown in FIG. 6 (b). Moreover, if the edge portion of the color filter 11 is set near the edge portion of the transmissive region 8 within the bonding accuracy, such a problem will occur.

As described above, in the case of the transflective liquid crystal display device, when the lower substrate 1 and the color filter substrate 2 are attached to each other when the attachment displacement occurs, Color filter 11
If the region where the pixel is not formed overlaps the transmissive region 8 of the pixel electrode, the chromaticity and brightness of the transmissive region 8 change, so that the substrate bonding precision in the liquid crystal process in the production of the liquid crystal display device is sufficiently high. In consideration of color filter 1
It is desirable to determine the pattern of the color filter 11 so that the region where 1 is not formed does not overlap the transmissive region 8 of the pixel electrode.

(Second Embodiment) Next, a liquid crystal display device according to a second embodiment of the present invention will be described with reference to the drawings. 7A and 7B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the second embodiment.

In the second embodiment, as shown in FIG. 7A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, regions (E1) and (E2) where no color filter is formed are provided. Then, the area (E
By displaying white by 1) and (E2) and mixing the color with a color filter having high color purity, it is possible to realize a bright display necessary for a reflective region in a transflective liquid crystal display device. .

The structure shown in FIG. 7A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

On the other hand, FIG. 7B shows the lower substrate 1
3 shows a case where the color filter substrate 2 is attached in the direction of the arrow while being displaced, and the color filter 11 on the color filter substrate 2 of the liquid crystal display device at this time is shown.
And the pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the second embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Even if the color filter substrate 2 is deviated in the direction of the arrow with respect to 1 and is bonded, the color filter 1
The total area S (E ′) of the regions (E1 ′) and (E2 ′) in which 1 is not formed is the same as that of the lower substrate 1 and the color filter substrate 2 as designed as shown in FIG. When compared with the total area S (C) of the areas (E1) and (E2) where the color filter 11 is not formed when S is attached, S (E ′) = (E1 ′) + (E2 ′) S ( E) = (E1) + (E2) S (E ′) = S (E), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the second embodiment has a region where the color filter is not formed, and
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

With respect to this point, in the second embodiment, when the lower substrate 1 and the color filter substrate 2 are misaligned in the case of a transflective liquid crystal display device, the liquid crystal display device is produced. In consideration of the substrate bonding accuracy in the liquid crystal process in the above, the pattern shape of the color filter 11 is determined so that the region where the color filter 11 is not formed does not overlap the transmissive region 8 of the pixel electrode (color filter 11 Edge and transparent area 8
The distance between the edge of the liquid crystal display device and the edge portion of the liquid crystal display device is larger than the bonding accuracy. It is possible to suppress the change in brightness.

(Third Embodiment) Next, a liquid crystal display device according to a third embodiment of the present invention will be described with reference to the drawings. 8A and 8B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the third embodiment.

In the third embodiment, as shown in FIG. 8A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, the area (F) where the color filter is not formed is provided. Then, by displaying white in the area (F) where the color filter is not formed and mixing the color with the color filter having high color purity, a bright display necessary for the reflective area in the transflective liquid crystal display device is realized. It is possible to do.

The structure shown in FIG. 8A shows a case where the lower substrate 1 and the color filter substrate 2 are bonded to each other with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

On the other hand, FIG. 8B shows the lower substrate 1
3 shows a case where the color filter substrate 2 is attached in the direction of the arrow while being displaced, and the color filter 11 on the color filter substrate 2 of the liquid crystal display device at this time is shown.
And the pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the third embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Even if the color filter substrate 2 is deviated in the direction of the arrow with respect to 1 and is bonded, the color filter 1
The area of the region S (F ′) in which 1 is not formed is shown in FIG.
Compared with the area of the region S (F) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in (a), S (F ′) = S (F), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the third embodiment has a region where the color filter is not formed, and
A color filter is formed in a pattern shape such that the total area does not change even if a bonding deviation occurs in the areas (the distance between the edge of the color filter 11 and the edge of the transmissive region 8 is larger than the bonding accuracy). Therefore, it is possible to realize a liquid crystal display device in which changes in chromaticity and brightness do not occur.

(Fourth Embodiment) Next, a liquid crystal display device according to the fourth embodiment of the present invention will be described with reference to the drawings. 9A and 9B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the fourth embodiment.

In the fourth embodiment, as shown in FIG. 9A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, a region (G) where no color filter is formed is provided. Then, by displaying white in the area (G) where the color filter is not formed and mixing the color with the color filter having high color purity, a bright display necessary for the reflective area in the transflective liquid crystal display device is realized. It is possible to do.

The structure shown in FIG. 9A shows a case where the lower substrate 1 and the color filter substrate 2 are bonded to each other with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

On the other hand, FIG. 9B shows the lower substrate 1
3 shows a case where the color filter substrate 2 is attached in the direction of the arrow while being displaced, and the color filter 11 on the color filter substrate 2 of the liquid crystal display device at this time is shown.
And the pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the fourth embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Even if the color filter substrate 2 is deviated in the direction of the arrow with respect to 1 and is bonded, the color filter 1
The area of the region S (G ′) in which 1 is not formed is shown in FIG.
Compared with the area of the region S (G) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in FIG. ′) = S (G), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the fourth embodiment has a region where the color filter is not formed, and
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

(Fifth Embodiment) Next, a liquid crystal display device according to a fifth embodiment of the present invention will be described with reference to the drawings. 10A and 10B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the fifth embodiment, and FIG. 10C is a color diagram of the liquid crystal display device according to the fifth embodiment. It is the top view which showed the pattern of the whole filter.

In the fifth embodiment, as shown in FIG. 10A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, the area (H) where the color filter is not formed is provided. Then, by displaying white in the area (H) where the color filter is not formed and mixing the color with the color filter having high color purity, a bright display necessary in the reflective area in the transflective liquid crystal display device is realized. It is possible to do.

In the liquid crystal display device according to the fifth embodiment, as shown in FIG.
The color filter 11 as shown in FIG.
Color display is performed by arranging three colors of G, B.

The structure shown in FIG. 10A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 10 (b) shows a case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced, and the color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the fifth embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. 1, the area of the region S (H ′) in which the color filter 11 is not formed even when the color filter substrate 2 is bonded in the direction of the arrow in the direction of the arrow in FIG.
Compared with the area of the region S (H) in which the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded with the accuracy as designed as shown in 0 (a), S ( H ') = S (H), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the fifth embodiment has a region where the color filter is not formed, and
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

(Sixth Embodiment) Next, a liquid crystal display device according to the sixth embodiment of the present invention will be described with reference to the drawings. 11A and 11B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the sixth embodiment.

In the sixth embodiment, as shown in FIG. 11A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, a region (I) where no color filter is formed is provided. Then, by displaying white in the area (I) where the color filter is not formed and mixing the color with the color filter having high color purity, a bright display necessary for the reflective area in the transflective liquid crystal display device is realized. It is possible to do.

The structure shown in FIG. 11A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 11B shows the case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced. The color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the sixth embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. 1, the area of the region S (I ′) in which the color filter 11 is not formed even if the color filter substrate 2 is attached in the direction of the arrow in FIG.
Compared with the area of the region S (I) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in FIG. I ′) = S (I), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the sixth embodiment has a region where the color filter is not formed, and
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

Next, FIG. 9 (a), FIG. 10 (a), and FIG.
Taking (a) as an example, the influence of variations in finish at the edge portion of the color filter on the optical characteristics will be briefly described.

First, in FIG. 11A, a boundary line between the area where the color filter 11 is formed and the area where the color filter 11 is not formed (hereinafter referred to as a boundary line).
Are all present in the area corresponding to the reflection part. On the other hand, in FIG. 9A, since a part of the boundary line protrudes from the area corresponding to the reflecting portion, the boundary line existing in the area corresponding to the reflecting portion is shown in FIG. It's getting shorter. Further, in FIG. 10A, since more of the boundary line extends beyond the area corresponding to the reflection portion, the boundary line existing in the area corresponding to the reflection portion is shorter than that in FIG. 9. Has become.

Here, when the finish of the color filter edge portion varies, the boundary line portion existing in the region corresponding to the reflecting portion affects the optical characteristics. Therefore, for example, in FIG.
As shown in FIG. 10A, the length of the boundary line existing in the area corresponding to the reflecting portion is set by making a part of the boundary line protrude from the area corresponding to the reflecting portion. Is shortened, and it is possible to make it less likely to be affected by variations in finish at the edge of the color filter.

Alternatively, at least on the boundary line in the region corresponding to the reflection part, by forming a black mask having a line width wider than the variation in the finish at the color filter edge part, the aperture ratio is somewhat sacrificed, but the color purity is reduced. It is possible to reduce variations in display characteristics such as contrast and contrast.

(Embodiment 7) Next, a liquid crystal display device according to Embodiment 7 of the present invention will be described with reference to the drawings. 12A and 12B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the seventh embodiment.

In the seventh embodiment, as shown in FIG. 12A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, regions (J1) and (J2) where no color filter is formed are provided. Then, a region (J
By displaying white by 1) and (J2) and mixing the colors with a color filter having high color purity, it is possible to realize a bright display necessary for a reflective region in a reflective liquid crystal display device.

The structure shown in FIG. 12A shows a case where the lower substrate 1 and the color filter substrate 2 are bonded to each other with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 12 (b) shows a case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced. The color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the seventh embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. When the color filter substrate 2 is deviated in the arrow direction with respect to 1 and attached, the total area S (J ′) of the regions (J1 ′) and (J2 ′) where the color filter 11 is not formed is shown in FIG. The total area S (J) of the regions (J1) and (J2) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in a). Compared with, S (J ′) = (J1 ′) + (J2 ′) S (J) = (J1) + (J2) S (J ′) <S (J).

However, this seventh embodiment
Has a region where no color filter is formed, and the color filter is formed with a pattern shape that changes as a result when the areas of these areas are misaligned, but colors with the same area Compared with Comparative Example 1 in which a region where no filter is formed is formed in only one place, the amount of change in this area is extremely small and the change in chromaticity and brightness does not occur.

Next, with reference to FIGS. 12A and 13A as an example, the influence on the optical characteristics due to variations in the finish at the color filter edge portion will be briefly described.

First, in FIGS. 12 (a) and 13 (b),
When the area of the region where the color filter 11 corresponding to the reflection portion is not formed is the same, the boundary line corresponding to the reflection portion is shorter in FIG. 12A than in FIG. 13A. ing. Therefore, in FIG. 12A, it is possible to make it more difficult to be affected by variations in the finish at the color filter edge portion.

Depending on the type of the color filter layer used for the color filter 11, the effect of variations in the finish at the color filter edge portion may be greater than the bonding accuracy. In such a case, in particular, The pattern shown in FIG. 12A is preferable to that shown in FIG.

Then, by forming a black mask having a line width wider than the variation in the finish at the color filter edge portion at least on the boundary line in the region corresponding to the reflection portion, the aperture ratio is somewhat sacrificed, but the color purity is slightly reduced. It is possible to reduce variations in display characteristics such as contrast and contrast.

(Embodiment 8) Next, a liquid crystal display device according to Embodiment 6 of the present invention will be described with reference to the drawings. 13A and 13B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the eighth embodiment.

In the eighth embodiment, as shown in FIG. 13A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. And areas (K1), (K2), (K3), and (K) where the color filter is not formed.
4) is provided. Then, the areas (K1), (K2), (K3) where the color filter is not formed,
By displaying white by (K4) and mixing the color with a color filter having high color purity, it is possible to realize bright display necessary for a reflective region in a reflective liquid crystal display device.

The structure shown in FIG. 13A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 13B shows the case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced. The color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the eighth embodiment, when the lower substrate 1 and the color filter substrate 2 are attached to each other, as shown in FIG. Areas (K1 ′) where the color filter 11 is not formed even if the color filter substrate 2 is deviated in the arrow direction with respect to 1 and bonded to each other (K2 ′),
The total area S (K ′) of (K3 ′) and (K4 ′) is shown in FIG.
Regions (K1) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded to each other with the accuracy as designed as shown in FIG.
2), (K3), compared with the total area S (K) of (K4), S (K ′) = (K1 ′) + (K2 ′) + (K3 ′) +
(K4 ′) S (K) = (K1) + (K2) + (K3) + (K4) S (K ′) = S (K), and the chromaticity and brightness of the liquid crystal display device do not change. .

As described above, in the eighth embodiment, in addition to having the area where the color filter is not formed,
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

(Ninth Embodiment) Next, a liquid crystal display device according to a ninth embodiment of the present invention will be similarly described with reference to the drawings. 14A and 14B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the ninth embodiment.

In the ninth embodiment, as shown in FIG. 14A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, the region (L) where the color filter is not formed is provided. Then, white is displayed in the area (L) where the color filter is not formed and mixed with a color filter having a high color purity to realize a bright display necessary in the reflective area in the reflective liquid crystal display device. Is possible.

The structure shown in FIG. 14A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 14B shows a case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced. The color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the ninth embodiment, when the lower substrate 1 and the color filter substrate 2 are attached to each other, as shown in FIG. 1, the area of the region S (L ′) in which the color filter 11 is not formed even if the color filter substrate 2 is attached in the direction of the arrow in the direction of the arrow in FIG.
Compared with the area of the region S (L) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in FIG. L ′) = S (L), and the chromaticity and brightness of the liquid crystal display device do not change.

As described above, the ninth embodiment has a region where the color filter is not formed, and
Since the color filters are formed in a pattern shape that does not change as a whole even if their areas are misaligned, it is possible to realize a liquid crystal display device that does not change in chromaticity or brightness. Has become.

(Tenth Embodiment) Next, a liquid crystal display device according to a tenth embodiment of the present invention will be described with reference to the drawings. 15A and 15B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the tenth embodiment.

In the tenth embodiment, as shown in FIG. 15A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, a region (M) where no color filter is formed is provided. Then, white is displayed in the area (M) where the color filter is not formed, and the white color is mixed with the color filter having high color purity to realize a bright display required in the reflective area in the reflective liquid crystal display device. Is possible.

The structure shown in FIG. 15A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 15B shows a case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced, and the color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the tenth embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Even if the color filter substrate 2 is bonded to the substrate 1 in the direction of the arrow with respect to 1, the area of the region S (M ′) in which the color filter 11 is not formed has an accuracy as designed as shown in FIG. Compared with the area of the region S (M) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together, S (M ′) = S (M), and the liquid crystal display No change in chromaticity or brightness of the device occurs.

As described above, in the tenth embodiment, the color filter has a pattern shape such that it has a region in which the color filter is not formed, and the total area does not change even if the misalignment occurs. Therefore, it is possible to realize a liquid crystal display device in which changes in chromaticity and brightness do not occur.

Next, with reference to FIGS. 14A and 15A as an example, the influence of variations in the finish at the edge portion of the color filter on the optical characteristics will be briefly described.

First, the region L in which the color filter 11 corresponding to the pixel electrode 3 in FIG.
A region M in which one side is a quadrangle of x and y, and the color filter 11 corresponding to the pixel electrode 3 in FIG. 15A is not formed is a circle having a radius of r, and both areas have the same area. To do. Then, as shown in FIGS. 14 (a) and 15 (a), it is assumed that the exposure process for creating the color plate causes a variation in the finish at the color filter edge portion by d more than the set value described above.

At this time, the area difference ΔL generated in FIG. 14A is ΔL = (x + 2d) (y + 2d) -xy = 2d (x +
y) + 4d ² and this value becomes the minimum when x = y, and ΔL = 4dx + 4d ² . Here, since both areas are equal, xy = x ² = πr ² x = (√π) r, and therefore ΔL = 4 (√π) rd + 4d ² . Further, the area difference ΔM generated in FIG. 15A is ΔM = π (r + d) 2-πr ² = 2πrd + πd ² , and therefore ΔL> ΔM.

As described above, when the areas L and M have the same area, the circular pattern as shown in FIG. 15A has a peripheral length, that is, the above-described boundary line is shorter. It is possible to reduce the influence of variations in finish at the edge of the color filter.

Also at this time, the aperture ratio is somewhat sacrificed by forming a black mask having a line width wider than the variation of the finish in the color filter edge portion at least on the boundary line in the region corresponding to the reflecting portion. However, variations in display characteristics such as color purity and contrast can be reduced.

(Embodiment 11) Next, a liquid crystal display device according to Embodiment 11 of the present invention will be described with reference to the drawings. 16A and 16B are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the eleventh embodiment, and FIG. 16C is a color diagram of the liquid crystal display device according to the eleventh embodiment. It is the top view which showed the pattern of the whole filter.

In the eleventh embodiment, as shown in FIG. 16A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, regions (N1) and (N2) where no color filter is formed are provided. Then, white is displayed by the areas (N1) and (N2) where the color filter is not formed, and by mixing with a color filter having high color purity, a bright display necessary for the reflective area in the reflective liquid crystal display device. Can be realized.

In the liquid crystal display device according to the eleventh embodiment, as shown in FIG.
Color display is performed by arranging the color filters 11 as shown in (a) in a delta shape in three colors of R, G, B.

The structure shown in FIG. 16A shows a case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 16B shows the case where the color filter substrate 2 is attached to the lower substrate 1 while being displaced in the arrow direction. The color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the eleventh embodiment, when the lower substrate 1 and the color filter substrate 2 are attached to each other, as shown in FIG. Regions (N1 '), (N2') where the color filter 11 is not formed even if the color filter substrate 2 is deviated in the arrow direction with respect to 1 and bonded.
16A, the total area S (N ′) is a region where the color filter 11 is not formed in the case where the lower substrate 1 and the color filter substrate 2 are bonded with the accuracy as designed as shown in FIG. Total area S (N) of N1) and (N2)
Compared with S (N ′) = (N1 ′) + (N2 ′) S (N) = (N1) + (N2) S (N ′) = S (N), the chromaticity of the liquid crystal display device and No change in brightness occurs.

As described above, in the eleventh embodiment, the color filter has a pattern shape such that it has a region in which the color filter is not formed and the area thereof does not change as a whole even if the displacement of the bonding occurs. Therefore, it is possible to realize a liquid crystal display device in which changes in chromaticity and brightness do not occur.

(Embodiment 12) Next, a liquid crystal display device according to Embodiment 12 of the present invention will be described with reference to the drawings. 17A and 17B are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the twelfth embodiment.

In the twelfth embodiment, as shown in FIG. 17A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, the area (O) where the color filter is not formed is provided. Then, white is displayed in the area (O) where the color filter is not formed and mixed with a color filter having high color purity, thereby realizing a bright display required in the reflective area in the reflective liquid crystal display device. Is possible.

The structure shown in FIG. 17A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 17B shows the case where the color filter substrate 2 is attached to the lower substrate 1 in the direction of the arrow while being displaced, and the color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the twelfth embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Even if the color filter substrate 2 is bonded in the direction of the arrow with respect to 1, the area of the region S (O ′) in which the color filter 11 is not formed has an accuracy as designed as shown in FIG. In comparison with the area of the region S (O) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together, S (O ′) = S (O), and the liquid crystal display No change in chromaticity or brightness of the device occurs.

As described above, in the twelfth embodiment, the color filter has a pattern shape such that it has a region in which the color filter is not formed and the area thereof does not change as a whole even if the bonding deviation occurs. Therefore, it is possible to realize a liquid crystal display device in which changes in chromaticity and brightness do not occur.

However, in such a case, the circumferential pattern is not arranged in the range within the laminating accuracy in the lateral direction, and the pattern shown in FIG.
It is necessary to set a rectangular pattern as shown in 6 (a).

(Thirteenth Embodiment) Next, a liquid crystal display device according to the thirteenth embodiment of the present invention will be described with reference to the drawings. 18A to 18D are enlarged plan views showing the pixel electrode portion of the liquid crystal display device according to the thirteenth embodiment.

In the thirteenth embodiment, as shown in FIG. 18A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, regions (P1) and (P2) where no color filter is formed are provided. Then, white is displayed by the areas (P1) and (P2) where the color filter is not formed, and by mixing with a color filter having a high color purity, a bright display necessary for the reflective area in the reflective liquid crystal display device. Can be realized.

The structure shown in FIG. 18A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 18B shows a case where the color filter substrate 2 is attached to the lower substrate 1 while being displaced in the arrow direction, and the color filter of the liquid crystal display device at this time is attached. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the thirteenth embodiment, when the lower substrate 1 and the color filter substrate 2 are bonded together, as shown in FIG. Regions (P1 ′) where the color filter 11 is not formed even if the color filter substrate 2 is bonded to the substrate 1 in the arrow direction with respect to 1 (P1 ′), (P1 ′)
18 (a) is the total area S (P ') of the area where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed ( Total area S (P) of P1) and (P2)
Compared with S (P ′) = (P1 ′) + (P2 ′) S (P) = (P1) + (P2) S (P ′) = S (P), the chromaticity of the liquid crystal display device and No change in brightness occurs.

As described above, in the thirteenth embodiment, the color filter has a pattern shape such that it has a region in which the color filter is not formed, and the total area of the regions does not change even when the displacement of the bonding occurs. Therefore, it is possible to realize a liquid crystal display device in which changes in chromaticity and brightness do not occur.

Next, with reference to FIGS. 18C and 18D as an example, the influence of variations in the finish at the color filter edge portion on the optical characteristics will be briefly described.

First, a region (P1) in which the color filter 11 corresponding to the pixel electrode 3 of FIG.
+ P2) is the area of two quadrangles each having x in the vertical direction and y in the horizontal direction (corresponding to the short side of the pixel), and the region ((a) in which the color filter corresponding to the pixel electrode 3 is not formed ( P
1 + P2) is x'in the vertical direction (corresponding to the long side of the pixel) and y in the horizontal direction.
It is the area of two squares of '. At this time, it is assumed that due to the exposure process of forming the color plate, the CF edge finish varies by d from the above-mentioned set value.

At this time, the area difference ΔP occurring in FIG. 18C is ΔP = 2 (x + d) y−2xy = 2dy, and the area difference ΔP occurring in FIG. 18D is ΔC = 2x ′. (Y ′ + d) −2x′y = 2dx ′ y <x ′, and therefore ΔC> ΔP.

As described above, in the case where the pixel electrode has a rectangular shape, it is better to form a region where the color filter 11 is not formed in the region corresponding to the reflection part so that the entire short axis of the pixel electrode is one side. It is possible to make it less likely to be affected by variations in finish at the edge portion of the filter.

Also at this time, the aperture ratio is somewhat sacrificed by forming a black mask having a line width wider than the variation in the finish of the color filter edge portion at least on the boundary line in the area corresponding to the reflection portion. However, variations in display characteristics such as color purity and contrast can be reduced.

(Fourteenth Embodiment) Next, a liquid crystal display device according to a fourteenth embodiment of the present invention will be described with reference to the drawings. 19A to 19C are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the fourteenth embodiment, and FIG. 19D is a plan view of the liquid crystal display device according to the fourteenth embodiment. It is a top view showing the pattern of the whole color filter.

In the fourteenth embodiment, as shown in FIG. 19A, a color filter for a transmissive liquid crystal display device having high color purity is formed in a region corresponding to the pixel electrode 3 on the color filter substrate 2. In addition, a region (Q) where no color filter is formed is provided. By displaying white in the area (Q) where the color filter is not formed and mixing the color with the color filter having high color purity, a bright display necessary for the reflective area in the reflective liquid crystal display device can be realized. Is possible.

In the liquid crystal display device according to the fourteenth embodiment, as shown in FIG.
Color display is performed by arranging the color filters 11 as shown in (a) in a delta shape in three colors of R, G, B.

The structure shown in FIG. 19A shows the case where the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed, and the color filter of the liquid crystal display device at this time is shown. The color filter 11 on the substrate 2 and the pixel electrode 3 on the substrate 1 facing the color filter 11 are shown.

On the other hand, FIG. 19 (b) shows a case where the color filter substrate 2 is attached to the lower substrate 1 while being displaced in the arrow direction. The color filter of the liquid crystal display device at this time is shown. Color filter 1 on substrate 2
1 and a pixel electrode 3 on the substrate 1 facing it.

Here, in the manufacturing process of the liquid crystal display device according to the fourteenth embodiment, when the lower substrate 1 and the color filter substrate 2 are attached to each other, as shown in FIG. Even when the color filter substrate 2 is bonded to the substrate 1 in the direction of the arrow in the direction of the arrow, the area S (Q ′) in which the color filter 11 is not formed is as shown in FIG.
Compared with the area of the region S (Q) where the color filter 11 is not formed when the lower substrate 1 and the color filter substrate 2 are bonded together with the accuracy as designed as shown in FIG. Since Q ') = S (Q), the chromaticity and brightness of the liquid crystal display device do not change.

As described above, in the fourteenth embodiment, the color filter has a pattern shape such that it has a region in which the color filter is not formed and the area thereof does not change as a whole even if the bonding deviation occurs. Therefore, it is possible to realize a liquid crystal display device in which changes in chromaticity and brightness do not occur.

Next, with reference to FIG. 19C as an example, the influence of variations in the finish at the edge portion of the color filter on the optical characteristics will be briefly described.

FIG. 19 (a) corresponds to FIG.
The colored portion of (a) is divided into upper and lower parts, and P1 and P2 are combined and arranged in the central portion of the pixel electrode. Therefore, in comparison with FIG. 9A in which the colored portion of FIG. 18D is divided into upper and lower parts and C1 and C2 are placed at the center of the pixel together, the influence of variations in finish at the edge portion of the color filter is reduced. It is possible to make it hard to receive.

Also at this time, the aperture ratio is somewhat sacrificed by forming a black mask having a line width wider than the variation in the finish of the color filter edge portion at least on the boundary line in the region corresponding to the reflecting portion. However, variations in display characteristics such as color purity and contrast can be reduced.

The liquid crystal display device according to the present invention is characterized by the color filter pattern shape as described in each of the above-described embodiments, but the present invention is not limited to the color described in each of the above-described embodiments. The shape of the filter is not limited to the pattern shape, and the area of the area where the color filter is not formed is constant even when the pixel electrode area of the liquid crystal display device and the color filter forming area are misaligned. Any color filter having such a pattern shape may be used.

[0161]

According to the present invention, the pixel electrode is formed on one of the pair of substrates which are bonded to face each other with the liquid crystal layer sandwiched therebetween, and the pixel electrode is formed. In a liquid crystal display device in which a region where a color filter is formed and a region where a color filter is not formed are formed in a region corresponding to the pixel electrode on the substrate on the other side, the color filter is the pixel When the color filter is created, it is characterized in that the area of the area where the color filter is not formed is constant even if the electrode area and the area where the color filter is formed are misaligned. Even if color plate misregistration in the LCD or substrate misalignment during panel creation occurs, the optical characteristics such as brightness and color tone of the liquid crystal display device may vary. It is possible to minimize the can.

[Brief description of drawings]

FIG. 1 (a) is an enlarged plan view showing a pixel electrode portion of a reflective liquid crystal display device in Comparative Example 1 of the present invention, and FIG. 1 (b) is an A view in FIG. 1 (a). It is an expanded sectional view showing the section of the A'line.

FIG. 2 (a) is an enlarged plan view showing a pixel electrode portion of a conventional reflective liquid crystal display device, and FIG. 2 (b) is
It is an expanded sectional view showing the section of the AA 'line in Drawing 2 (a).

FIG. 3 is an enlarged plan view showing a pixel electrode portion of a transflective liquid crystal display device in Comparative Example 1 of the present invention.

4 (a) and 4 (b) are enlarged plan views showing pixel electrode portions of a reflective liquid crystal display device in Comparative Example 1 of the present invention.

5A to 5D are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the first embodiment.

6 (a) and 6 (b) are enlarged plan views showing pixel electrode portions of a transflective liquid crystal display device in Comparative Example 2 of the present invention.

7A and 7B are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the second embodiment.

8A and 8B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the third embodiment.

9A and 9B are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the fourth embodiment.

10A and 10B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the fifth embodiment, and FIG. 10C is a liquid crystal according to the fifth embodiment. FIG. 7 is a plan view showing a pattern of the entire color filter of the display device.

11A and 11B are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the sixth embodiment.

12A and 12B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the seventh embodiment.

13A and 13B are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the eighth embodiment.

14A and 14B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the ninth embodiment.

15 (a) and 15 (b) are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the tenth embodiment.

16A and 16B are enlarged plan views showing a pixel electrode portion of the liquid crystal display device according to the eleventh embodiment, and FIG. 16C is a liquid crystal according to the eleventh embodiment. FIG. 7 is a plan view showing a pattern of the entire color filter of the display device.

17 (a) and 17 (b) are enlarged plan views showing pixel electrode portions of the liquid crystal display device according to the twelfth embodiment.

FIG. 18A to FIG. 18D show the thirteenth embodiment.
3 is an enlarged plan view showing a pixel electrode portion of the liquid crystal display device in FIG.

19A to 19C show a fourteenth embodiment.
19D is an enlarged plan view showing the pixel electrode portion of the liquid crystal display device in FIG. 19D, and FIG. 19D is a plan view showing the pattern of the entire color filter of the liquid crystal display device in the fourteenth embodiment.

[Explanation of symbols]

1 Lower substrate 2 Color filter substrate 3 Pixel electrode (reflection area) 4 transparent electrodes 5 Liquid crystal layer 8 pixel electrodes (transmissive area) 11 color filters

Continuation of the front page (56) Reference JP-A-10-142621 (JP, A) JP-A-11-109331 (JP, A) JP-A-11-295736 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) G02F 1/1335

Claims (3)

(57) [Claims] 1. A reflecting portion for reflecting external light and a transmitting portion for transmitting light from a back light source are provided on one substrate of a pair of substrates which are bonded to face each other with a liquid crystal layer interposed therebetween. In a liquid crystal display device in which a pixel electrode that configures a pixel in one pixel is formed, and a color filter is formed on the other side substrate of the pair of substrates, the reflection unit on the other side substrate. The region corresponding to is composed of a region in which a color filter is formed and a region in which a color filter is not formed, and the color filter has a bonding displacement between the pixel electrode region and the color filter formation region. A liquid crystal display device, characterized in that, even when it occurs, the area of the region where the color filter is not formed is constant. 2. The liquid crystal display device according to claim 1 , wherein a region corresponding to the transmissive portion on the other substrate is constituted by a region where a color filter is formed. 3. A region in which the color filter over is formed on the boundary between the color filter over is not formed region, according to claim 1 or 2, characterized in that the black mask is formed Liquid crystal display device.