JP4899698B2 - Color filter and liquid crystal display device using the same - Google Patents

Description

  The present invention relates to a color filter used in a color liquid crystal display device and a color liquid crystal display device using the same.

  Conventionally, a normal active matrix type liquid crystal display device has a predetermined distance between an active matrix substrate on which a thin film transistor (TFT) and a pixel electrode are formed as switching elements, and a color filter on which a color filter layer and a counter electrode are formed. Are arranged so as to face each other, and a liquid crystal layer is sandwiched between the gaps. In order to keep the thickness of the liquid crystal layer constant, it was held by a bead spacer made of plastic or the like.

Since these plastic beads are scattered on the substrate, the position cannot be fixed, and light scattering is caused by the beads existing on the pixels, which deteriorates the display quality.
In order to solve the above problems, a structure is proposed in which the colored layers constituting the color filter are laminated, formed as a laminated photo spacer at a predetermined position (on the light shielding layer), and the thickness of the liquid crystal layer is kept constant. Has been.
Japanese Patent Laid-Open No. 9-43425

  On the other hand, with the three primary colors of red (R), green (G), and blue (B), the color characteristics of the pigments used are far from the ideal color characteristics, so the colors in the natural world cannot be reproduced. , B In addition to the three primary colors, liquid crystal displays have been developed that combine cyan (C), yellow (Y), and magenta (M), which are complementary colors.

  In order to keep the distance between the active matrix substrate and the color filter constant, a photo spacer or a laminated photo spacer having a uniform in-plane height is used. However, there is an act in which the observer strongly presses the screen with a finger or the like (particularly in the case of small and medium-sized panels). For this reason, the photo spacer is broken and cannot maintain a certain thickness, and the display quality is deteriorated. The problem occurs.

  The present invention has been made under the circumstances as described above, and by changing the combination of the colored layers to be laminated, the photo spacers having different heights in the screen can be changed into two types of laminated photo spacers (main photo spacer and sub photo spacer). A photo spacer is intended to be formed without increasing the number of manufacturing steps.

In order to solve the above-described problems, the first invention of the present invention includes a yellow (Y) colored layer in addition to the three primary colored layers of red (R), green (G), and blue (B) light. In a color filter for a color liquid crystal display device in which at least one color layer is selected from cyan (C) and magenta (M) and added to the color layer.
By selecting and laminating at least two of the colored layers, a spacer is formed on the black matrix layer to maintain a distance from the counter substrate of the liquid crystal display device, or a part of the spacer is formed. A color filter,
Sub spacer colored layer stacked, is formed thinly by using a colored layer of another color layer amount of pigment is less likely to contain than the yellow (Y), the main spacers except Lee yellow (Y) remaining The color filter is formed by laminating the colored layers.

  According to a second aspect of the present invention, there is provided a color liquid crystal display device using the color filter as described above.

According to the present invention, a sub-spacer having a low height and a main spacer are formed in the screen, and a photo spacer having a different height is formed to counteract pressing (external force) with the sub-spacer having a low height. The force applied to the main spacer is reduced to prevent the main spacer from breaking.
Further, in the present invention, since the yellow colored layer uses the fact that the film thickness is thinner than the other colored layers, the step of forming the main and sub laminated spacers can be created simultaneously with the step of forming the colored layer. Therefore, there is no increase in separate processes.

The best mode for carrying out the invention will be described below.
Of the laminated spacers formed in the color filter according to one aspect of the present invention, the main spacer is formed on the resin black matrix layer 2 patterned in a lattice pattern on the glass substrate 1 as shown in FIG. In the embodiment shown in FIG. 1, the red (R), green (G), and blue (B) colored layers 3R, 3G, and 3B are selected and laminated. These three layers are laminated. According to this embodiment, the thickness of the resin black matrix layer is 1.25 μm, the thickness of the red (R) colored layer 3R is 1.62 μm, and the thickness of the green (G) colored layer 3G is 1.26 μm. The thickness of the blue (B) colored layer 3B is 0.9 μm.

As the second layer of green (G) colored layer 3G and the third layer of blue (B) colored layer 3B become thinner, the film thickness decreases because the colored layer is formed on the top surface of the protruding portion for use as a spacer. When the coating liquid is applied, the amount of the coating film to be carried on gradually decreases and the coating film becomes thin.
In other words, the coating film is formed with a film thickness of 1.8 μm on the pixel on which the colored layer is to be originally formed, but at the layered spacer portion, the red (R) colored layer 3R is 90% green ( The thickness of the colored layer 3G of G) is 70%, and the thickness of the colored layer 3B of blue (B) is 50%.

Therefore, the main spacer in FIG. 1 is 5.03 μm in height from the surface of the glass substrate 1 and 3.23 μm in height on the pixel surface (1.8 μm from the glass substrate).
In the embodiment of FIG. 1, the counter electrode 4 is provided on the entire surface of the color filter pixel on the three-layer spacer, and the auxiliary spacer 5 made of an insulating resin is used so as not to cause an electrical short circuit with the active matrix substrate. Has been added.

  On the other hand, among the stacked spacers formed in the color filter according to one embodiment of the present invention, the sub-spacer includes the yellow (Y) colored layer 3Y in the colored layer that is necessarily stacked as shown in FIG. It is included. The yellow (Y) colored layer 3Y has a small amount of pigment contained in the colored layer due to its thin color. Therefore, when applied to the top surface of the protruding portion such as a spacer, It becomes thinner than other colored layers.

  That is, in the embodiment of FIG. 2, the thickness of the resin black matrix layer is 1.25 μm, and the thickness of the red (R) colored layer 3R is 1.62 μm, which is the same as the main spacer of FIG. The thickness of the yellow (Y) colored layer 3Y is 1.08 μm, and the thickness of the cyan (C) colored layer 3C is 0.8 μm. The yellow (Y) colored layer 3C has a thickness of 60%, and the cyan (C) colored layer 3C has a thickness of 44%. Similar to the yellow (Y) colored layer 3C, the cyan (C) colored layer 3C also shows a slight decrease in the riding rate.

  Therefore, the sub-spacer of FIG. 2 is 4.75 μm in height from the surface of the glass substrate 1 and 2.95 μm in height from the pixel surface (1.8 μm from the glass substrate). This is about 0.3 μm lower than the main spacer of FIG. 1, and this height difference is suitable as a sub-spacer. The counter electrode 4 is provided on the entire surface of the color filter pixel on the three-layer spacer, and the auxiliary spacer 5 made of an insulating resin is further added so as not to cause an electrical short circuit with the active matrix substrate. And upset.

In addition, the laminated spacer formed in the color filter of the present invention has two or more colored layers to be laminated, but from the thickness of the liquid crystal layer, the number of laminated layers is sufficient up to four layers, There is little possibility of being stacked in five or more layers.
In the present invention, even if a colored layer is laminated, it may constitute only a part of the spacer, not the entire spacer. For example, as shown in the embodiment of FIGS. 1 and 2, the auxiliary spacer 5 made of an insulating resin is further added.

  The color filter of the present invention is opposed to the active matrix substrate to form a color liquid crystal display device, thereby obtaining a color display flat display resistant to pressure (external force).

The principal part expanded sectional view which shows an example of the main spacer of the color filter which concerns on one Embodiment of this invention. The principal part expanded sectional view which shows an example of the sub-spacer of the color filter which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Glass substrate 2 ... Black matrix layer 3 ... Colored layer 4 ... Counter electrode 5 ... Auxiliary spacer

Claims (2)

In addition to the three primary colors of red (R), green (G), and blue (B), at least one color of yellow (Y), cyan (C), and magenta (M) is used. In a color filter for a color liquid crystal display device in which a layer is selected and added to a colored layer,
By selecting and laminating at least two of the colored layers, a spacer is formed on the black matrix layer to maintain a distance from the counter substrate of the liquid crystal display device, or a part of the spacer is formed. A color filter,
Sub spacer colored layer stacked, is formed thinly by using a colored layer of another color layer amount of pigment is less likely to contain than the yellow (Y), the main spacers except Lee yellow (Y) remaining A color filter formed by laminating colored layers.   A color liquid crystal display device using the color filter according to claim 1.

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