JPH06103371B2 - Liquid crystal display element - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electrode structure of a liquid crystal display device having a light shielding layer, and more particularly to an electrode structure of a liquid crystal display device having a simple up / down structure having a light shielding layer.

[Conventional technology]

First, a liquid crystal display element having a simple vertical structure will be described. A data electrode provided on the first substrate and a second electrode
In the so-called passive matrix drive liquid crystal display element in which the timing electrodes provided on the substrate are overlapped so as to be orthogonal to each other, a voltage is sequentially applied to the timing electrodes, and a data signal adapted to the electrodes is applied from the data electrodes. When the number of electrodes is increased, crosstalk occurs and sufficient contrast cannot be obtained.

Therefore, the data electrode is divided into upper and lower parts into a first block and a second block. For example, the same timing is used for two of the first timing electrode of the first block and the first timing electrode of the second block. A simple top-bottom structure is a structure in which the voltage is applied by applying a voltage and the different data signals are applied to each to halve the number of timing electrodes viewed from the driving surface to suppress the occurrence of crosstalk and ensure the contrast.

FIG. 3 shows an electrode structure of a simple top and bottom liquid crystal display device having a light shielding layer formed by using the conventional technique. A plurality of data electrodes 302 separated by a space 303 between data electrodes are provided on the first substrate. Further, the data electrode 302 is divided into upper and lower blocks by the butting portion 301 provided in the screen center 300. In the non-pixel region of the data electrode 302, a data electrode light-shielding layer 306 shown by hatching in the lower left of FIG. 3 is provided.

The second substrate is provided with a plurality of timing electrodes 304 separated by a space 305 between the timing electrodes. In the non-pixel region of the timing electrode 304, a timing electrode light shielding layer 307 shown by hatching in the lower right of FIG. 3 is provided.

The first substrate and the second substrate are superposed so that the data electrode 302 and the timing electrode 304 installed on each are orthogonal to each other. Data electrode 302 and timing electrode 3
The intersection area of 04 becomes a pixel 308, which is a portion which operates when a voltage is applied to this liquid crystal display element. The inter-data electrode space 303 that does not operate even when a voltage is applied is shielded by the timing electrode light shielding layer 307, and the inter-timing electrode space 305 that does not operate similarly is shielded by the data electrode light shielding layer 306, and most of the non-pixel portion is shielded.

However, as is apparent from FIG. 3, the abutting portion 301 of the data electrode 302 is not shielded from light.

The graph of FIG. 4 (A) shows electro-optical characteristics when a liquid crystal display element having no data electrode light-shielding layer 306 and timing electrode light-shielding layer 307, which are light-shielding layers, is used in a normally white state. FIG. 4B shows electro-optical characteristics when the liquid crystal display device having the data electrode light-shielding layer 306 and the timing electrode light-shielding layer 307 and having the structure shown in FIG. 3 is used in a normally white state. In each graph, the vertical axis represents the average transmitted light intensity of the liquid crystal display element, and the horizontal axis represents the effective value of the voltage applied to the liquid crystal display element.

Description will be given below with reference to FIGS. 3 and 4.

First, the data electrode light-shielding layer 306 shown in FIG.
The electro-optical characteristics of the liquid crystal display element without the timing electrode light shielding layer 307 will be described. When a voltage is applied to the liquid crystal display element and the voltage is gradually increased, the transmitted light intensity decreases from L _S when it exceeds the voltage V _TLC , and it becomes the minimum transmitted light intensity L _O when it exceeds the voltage V _SATLC . The transmitted light intensity L _O is the sum of the transmitted light from the pixel 308 and the transmitted light from the data inter-electrode space 303 and the timing inter-electrode space 305.

A voltage is applied to the pixel 308 to sufficiently suppress the transmitted light. However, since no voltage is applied to the space 303 between the data electrodes and the space 305 between the timing electrodes,
The amount of transmitted light does not change and remains bright. The contrast ratio at this time is (L _S / L _O ). In the case of a liquid crystal display element having no light-shielding film as described above, the transmitted light intensity L _O is not sufficiently small and a sufficient contrast ratio cannot be obtained.

In the structure having neither the data electrode light-shielding layer 306 nor the timing electrode light-shielding layer 307, the smaller the dimension between the data electrode space 303 and the timing electrode space 307, the smaller the value of the transmitted light intensity L _O and the contrast. The ratio (L _S / L _O ) improves. However, in the present technology, the lower limit of each space dimension is about 30 μm. This can be reduced to about 10 μm when forming a small number of electrodes, but when forming a large number of data electrodes 302 and timing electrodes 304,
The above-mentioned 30 μm is the lower limit because short-circuiting between electrodes occurs due to dust in the manufacturing process and resist bubbles. In the actual production line, after forming the electrodes, a short-circuit check between the electrodes is performed, and the short-circuit portion is corrected by laser light. Next, the electro-optical characteristics when the light shielding film is provided in the space between the electrodes will be described. Fig. 4 (B)
Shows the electro-optical characteristics.

When the applied voltage is V _TLC or less, the transmitted light is L _S − (L _O −L _OO ).
And it is darker than the case without the light-shielding film, but V
_When a voltage higher than _SATLC is applied, the transmitted light intensity _{drops to} L _OO . Since the transmitted light of the black level is reduced from L _O to L _OO, contrast ratio _{(L S -L O + L OO} ) / L OO is enhanced significantly.

Here, a method of manufacturing the liquid crystal display device having the conventional electrode structure shown in FIG. 3 will be described. First, ITO (Indium Oxide) that becomes a transparent conductive film is formed on the glass substrate that becomes the first substrate.
A film is formed on the entire surface by a vacuum evaporation method or a sputtering method. On the transparent conductive film, a Cr (chrome) film to be a light shielding layer is similarly formed on the entire surface by a vacuum deposition method or a sputtering method. After that, on the substrate with this ITO film and Cr film formed,
A photoresist is applied and only the Cr film is etched by the photo etching method to form the data electrode light shielding layer 306. Next, a photoresist is coated again on this first substrate, and the Cr film and the ITO film are etched by the photoetching method to form the data electrode 302. A second substrate on which the timing electrode 304 and the timing electrode light shielding layer 307 are formed is formed by the same method.

Note that the size of the space 303 between the data electrodes and the space 305 between the timing electrodes has a lower limit of 30 μm from the capability of the current photo-etching process. The width of the data electrode light-shielding film 306 is set to 50 μm, which is the width 30 μm of the space 305 between the timing electrodes and the overlay accuracy of ± 10 μm of the first substrate and the second substrate. The width dimension of the butted portion 301 of the data electrode 302 was set to 10 μm. The data electrode pitch is 200 μm and the timing electrode pitch is 300 μm.
Therefore, the effective pixel size is 150 μm × 250 μm, and the aperture ratio of the liquid crystal display element is 62.5%.

[Problems to be Solved by the Invention]

However, a light-shielding film cannot be provided on the abutting portion 301 of the data electrode 302 having the simple vertical structure shown in FIG. Therefore, a white line runs laterally in the butted portion 301, and the display quality of the liquid crystal display element is significantly deteriorated.

It is an object of the present invention to solve the above problems and provide a liquid crystal display device having good display quality.

[Means for solving problems]

In order to achieve the above object, the liquid crystal display device of the present invention adopts the constitution described below.

The liquid crystal display device of the present invention includes a first substrate provided with a data electrode made of a transparent electrode film, a second substrate provided with a timing electrode made of a transparent electrode film, and a data electrode light-shield provided in a non-pixel region of the data electrode. Layer and a timing electrode light-shielding layer provided in the non-pixel area of the timing electrode, and the data electrode is divided into upper and lower parts at a position deviated from the screen center to form a butt portion, and the data electrode end provided so as to extend from the screen center A light-shielding layer is provided at the end of the data electrode to serve as a light-shielding layer at the end, and the width dimensions of the timing electrodes above and below the abutting portion are changed, and the width dimension of the timing electrode space near the abutting portion is smaller than that of the non-butting portion. When the first substrate and the second substrate are superposed on each other, the abutting portion is provided on the timing electrode having a wide width. From light at that time the electrode shielding layer,
Further, the narrow space between the timing electrodes in the vicinity of the abutting portion is characterized by being shielded by the data electrode end light shielding layer.

Further, the liquid crystal display device of the present invention includes a first substrate provided with a data electrode made of a transparent electrode film, a second substrate provided with a timing electrode made of a transparent electrode film, and a data electrode provided in a non-pixel region of the data electrode. The data electrode comprises a light-shielding layer and a timing electrode light-shielding layer provided in a non-pixel area of the timing electrode. A light-shielding layer is provided at the extreme part to serve as a light-shielding layer at the end of the data electrode. The timing electrode shield is provided near the data electrode butting part of the timing electrode with a wider width. A notch is provided at a position corresponding to the space between the data electrodes of the layer, and when the first substrate and the second substrate are superposed, the butted portion is shielded by the timing electrode light shielding layer provided on the timing electrode having a wide width. Moreover, the narrow space between the timing electrodes near the butted portion is shielded by the light shielding layer at the end of the data electrode, and the area between the first light leakage portion at the non-butted portion and the second light leakage portion at the butted portion is almost equal. The feature is that they are the same.

〔Example〕

A liquid crystal display device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing an electrode structure of a liquid crystal display device showing a first embodiment of the present invention.

As shown in FIG. 1, a plurality of data electrodes 102 separated by a space 103 between data electrodes are provided on the first substrate. Further, the data electrode 102 is divided into upper and lower first blocks and second blocks by the abutting portion 101 at a position deviated from the screen center 100. Then, in the non-pixel region of the data electrode 102, a data electrode light-shielding layer 108 shown by hatching to the left in FIG. 1 is provided. Further, a data electrode end light-shielding layer 110 is provided in the tip region of the data electrode 102 of the first block on the upper side of FIG. 1 so as to extend from the screen center 100.

The second substrate is provided with a plurality of timing electrodes 104 separated by a space 107 between the timing electrodes. Here, the upper and lower timing electrodes sandwiching the abutting portion 101, in particular, one is the timing electrode TU105 and the other is the timing electrode T.
Call it D106. The width dimension of the timing electrode TD106 is narrower than that of the timing electrode TU105. The timing electrode 107, the timing electrode TU105, and the timing electrode TD106 have a first
Timing electrode light shielding layer 10 shown by hatching in the lower right of the figure
Set 9. Here, the timing electrode light-shielding layer 109 provided on the timing electrode TD106 having a wide width is provided so as to extend the screen center 100. Further, the width dimension of the inter-timing electrode space 103 near the butted portion 101 of the data electrode 102 is made narrower than the inter-timing electrode space 107 of the non-butted portion other than the butted portion 101.

The data electrode 102 and the timing electrode 104, on which the first substrate and the second substrate are respectively placed, are stacked so as to be orthogonal to each other. The intersection area between the data electrode 102 and the timing electrode 104 serves as a pixel 113, which is a portion that operates when a voltage is applied to the liquid crystal display element of the present invention. Space between data electrodes that does not operate even when voltage is applied
103 is a space between the timing electrodes that is shielded by the timing electrode light shielding layer 109 and does not operate even if a voltage is applied.
107 is a pixel that is shielded by the data electrode shading layer 108.
Most of the non-pixel areas other than the 113 areas are shielded.

However, the first light leakage portion 111, which is the intersection area between the data electrode space 103 and the timing electrode space 107, does not shield light. Further, in the abutting portion 101, the second light leakage portion 112, which is an intersection region of the inter-timing electrode space 113 between the timing electrode TU105 and the timing electrode TD106, and the inter-data electrode space 103 is also not shielded.

Further, the light-shielding layer structure of the butting portion 101 will be described in detail.

The inter-timing electrode space 113 position between the timing electrode TU105 and the timing electrode TD106 is provided so as to deviate from the position of the screen center 100. And timing electrodes
The width dimension of the TD 106 is enlarged so as to spread upward beyond the screen center 100, and a timing electrode light shielding layer 109 that shields the butted portion 101 from light is provided on the upper side of the timing electrode TD106. Moreover, the data electrode end light-shielding layer 110 is provided so that the abutting portion 101 of the data electrode 102 is shifted below the screen center 100. Further, the dimension of the inter-timing electrode space 113 between the timing electrode TU105 and the timing electrode TD106 is set to be smaller than the inter-timing electrode space 107 of the non-butting portion other than the abutting portion 101. As a result, the inter-timing electrode space 113 between the timing electrode TU105 and the timing electrode TD106 can be shielded by the data electrode end light shielding layer 110 provided at the end of the data electrode 102 of the upper first block, The butting portion 101 is a timing electrode light shielding layer 109 provided on the timing electrode TD106.
You can block light with.

The manufacturing method of the liquid crystal display element shown in FIG. 1 is the same as the conventional manufacturing method of the liquid crystal display element, and therefore the description thereof will be omitted.

Here, the size of the space 103 between the data electrodes is 30 μm, the size of the butted part 101 of the data electrode 102 is 10 μm, and the size of the space 107 between the timing electrodes of the non-butted part is 30 μm.
m, and timing electrode TU105 and timing electrode TD106
The size of the space 113 between the timing electrodes is 10 μm.
Set each. The width dimension of each light-shielding layer is such that the overlay accuracy of the first substrate and the second substrate is ± 10 μm added to the space between the electrodes, and the dimension of the data electrode light-shielding layer 108 is 5.
The dimension of the timing electrode light shielding layer 109 is 50 μm, and the dimension of the data electrode end light shielding layer 110 is 30 μm.

Further, the pitch dimension of the data electrodes 102 is 200 μm, and the pitch dimension of the timing electrodes 104 is 300 μm. As a result, the size of the pixel 113 is 150 × 250 μm, and the aperture ratio of the liquid crystal display element is 62.5%.

If the inter-timing electrode space 113 between the timing electrode TU105 and the timing electrode TD106 is set to 30 μm without being set narrower than the inter-electrode space 107 in the non-butting portion, the width of the data electrode light shielding layer 108 is 70 μm, and the data electrode end is The width of the partial light shielding layer 110 should be 50 μm. In this case, the size of the pixel 113 is 150 × 230 μm and the aperture ratio is 57.7.
% And 5%, resulting in a liquid crystal display device with a dark screen.

It was thought that only the butted portion 101 would be shielded with a width of 70 μm, and the non-butted portion would be shielded with a width of 50 μm, but a black line appeared at the butted portion 101, and it became a liquid crystal display element that could not be actually used.

When the liquid crystal display element shown in the example of the present invention was turned on,
The white line at the butted part was suppressed and the display quality was good. However, when observed in detail, a thin black line was observed at the butted portion. The cause is the intersection area of the space between the timing electrodes and the space between the data electrodes.
This is because the area of the light leaking part 111 and the area of the second light leaking part 112 slightly change. The area of the first light leakage portion 111 is 30 × 30 square μm, and the area of the second light leakage portion 112 is 10 × 30 square μm. An embodiment in which the areas of the first light leakage portion 111 and the second light leakage portion 112 are made substantially the same will be described with reference to FIG.

FIG. 2 is a plan view showing a second embodiment of the present invention. The difference between the configurations of the first embodiment and the second embodiment is that the timing electrode T that shields the abutting portion 201 from light in the second embodiment.
The notch 200 is provided at a position of the timing electrode light-shielding layer 209 provided in D206 with respect to the space 103 between the data electrodes. The notch 200 is provided with a width dimension substantially the same as the space 103 between the data electrodes.

By providing this notch 200, the area of the first light leakage portion 203 of the non-butting portion and the area of the second light leakage portion 202 of the abutting portion can be made substantially the same. Therefore, the slightly visible black line observed in the first example could be greatly reduced. In this second embodiment, the notch 200 corresponds to the space 103 between the data electrodes.
It has a size of 30 x 10 μm. The area of the second light leakage portion 202 when the first substrate and the second substrate are stacked is 20 × 30.
The first light leakage portion 203 is a square μm and is a non-butting portion.
The area is not the same as 30 × 30 square μm, but it has the effect of significantly reducing the black lines.

It is also possible to set the size of the notch 200 to other dimensions such as 30 × 30 square μm and 50 × 25 square μm.

FIG. 5 shows a light shielding layer structure in a multiple matrix according to a reference example of the present invention. The space between the data electrodes is shielded on the timing electrode 501, and the space between the timing electrodes is shielded on the data electrode 502.

〔The invention's effect〕

As described above, according to the present invention, the abutting portion of the data electrode is shielded from light by providing the light shielding layer by changing the width of the timing electrode sandwiching the abutting portion, and the space between the timing electrodes sandwiching the abutting portion is set as the data of the non-butting portion. It should be narrower than the space between electrodes. As a result, it is possible to obtain a liquid crystal display element having a simple top-and-bottom structure which is bright and has a high contrast and has a good display quality.

Further, by forming a notch in the timing electrode light-shielding layer provided on the timing electrode that shields the butt portion, it is possible to obtain a liquid crystal display element of high display quality in which a slight black line generated at the butt portion is suppressed.

[Brief description of drawings]

1 is a plan view showing a liquid crystal display element in a first embodiment of the present invention, FIG. 2 is a plan view showing a liquid crystal display element in a second embodiment of the present invention, and FIG. 3 is a liquid crystal in a conventional example. FIG. 4A is a plan view showing a light shielding layer structure of a display element, FIG. 4A is a graph showing electro-optical characteristics of a liquid crystal display element having no light shielding layer, and FIG. 4B is a liquid crystal display element having a light shielding layer. FIG. 5 is a plan view showing a liquid crystal display element in a reference example of the present invention, showing a graph showing electro-optical characteristics. 100 ... Screen center, 101 ... Butt, 102 ... Data electrode, 104 ... Timing electrode, 108 ... Data electrode light-shielding layer, 109 ... Timing electrode light-shielding layer, 110 ... Data electrode end light-shielding layer, 200 …… Notch.

Claims (2)

[Claims] 1. A first substrate provided with a data electrode made of a transparent electrode film, a second substrate provided with a timing electrode made of a transparent electrode film, and a data electrode light-shielding layer provided in a non-pixel region of the data electrode. It is equipped with a timing electrode light shielding layer provided in the non-pixel area of the timing electrode, and the data electrode is divided into upper and lower parts at a position deviated from the screen center to form a butt portion, and the data electrode end portion provided so as to extend from the screen center is shielded from light. Layers are provided as data electrode end light shielding layers, the width dimensions of the timing electrodes above and below the abutting portion are changed, and the width dimension of the space between the timing electrodes near the abutting portion is made narrower than the space between the timing electrodes in the non-abutting portion, When the first substrate and the second substrate are superposed on each other, a butted portion is provided on the timing electrode having a wide width. The liquid crystal display device is shielded by the electrode shielding layer, further butted portion narrow timing electrode spacing of neighboring, characterized in that the shields in the data electrode end portion light shielding layer. 2. A first substrate provided with a data electrode made of a transparent electrode film, a second substrate provided with a timing electrode made of a transparent electrode film, and a data electrode light-shielding layer provided in a non-pixel region of the data electrode. It is equipped with a timing electrode light shielding layer provided in the non-pixel area of the timing electrode, and the data electrode is divided into upper and lower parts at a position deviated from the screen center to form a butt portion, and the data electrode end portion provided so as to extend from the screen center is shielded from light. Layers are provided as data electrode end light shielding layers, the width dimensions of the timing electrodes above and below the abutting portion are changed, and the width dimension of the space between the timing electrodes near the abutting portion is made narrower than the space between the timing electrodes in the non-abutting portion, Between the data electrodes of the timing electrode light-shielding layer that is provided near the data electrode butting part of the timing electrode with the wider width When a notch is provided at a position corresponding to a space and the first substrate and the second substrate are overlapped with each other, the butted portion is shielded by a timing electrode light shielding layer provided on a timing electrode having a wide width, and the vicinity of the butted portion is provided. The narrow space between the timing electrodes is shielded by the light-shielding layer at the end of the data electrode, and the first light leakage portion of the non-butted portion and the second light leakage portion of the butted portion are made to have substantially the same area. Characteristic liquid crystal display element.