JP2001100193A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a structure from getting complex and assembling man- hours from increasing by forming a structure to divide the initial alignment direction by utilizing existing structural components. SOLUTION: In a vertical alignment type liquid crystal display device of which the alignment of the liquid crystal is oriented to the vertical direction when no voltage is applied and which has the liquid crystal 3 with negative dielectric anisotropy held between a first substrate with an electrode and a vertical alignment layer and a second substrate 2 with a color filter 8, an electrode 10 and a vertical alignment layer 11, a projecting part 12 to divide the initial alignment direction of the liquid crystal 3 into plural directions is formed on the peripheral part of the pixel region by overlapping plural color elements of the color filter 8. The projecting part 12 is formed higher on the short edge side of the pixel region than on the long edge side.

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 having a wide viewing angle.

[0002]

2. Description of the Related Art In a liquid crystal display device having a wide viewing angle, in order to solve the problem of viewing angle dependence, as disclosed in, for example, Japanese Patent Application Laid-Open No. 2. Description of the Related Art It has been practiced to form an inclined surface to divide the orientation direction of liquid crystal into a plurality.

[0003]

However, forming a new structure for dividing the alignment direction on the electrode has a problem that the structure becomes complicated and the number of assembling steps increases. Therefore, the present invention takes the above points into consideration,
An object of the present invention is to solve the problems of a complicated structure and an increase in the number of assembling steps by forming a structure for dividing an orientation direction using existing components. Also,
It is an object of the present invention to provide an optimum structure for a vertical alignment type liquid crystal display device in which viewing angle dependence is eliminated and a wide field of view is achieved.

[0004]

According to the present invention, there is provided a liquid crystal display device having a liquid crystal sandwiched between a first substrate having a color filter, an electrode and an alignment film, and a second substrate having an electrode and an alignment film. The device is characterized in that a projection for dividing the initial alignment direction of the liquid crystal into a plurality is formed by superimposing a plurality of color elements of the color filter on a peripheral portion of a pixel region.

Further, the liquid crystal display device of the present invention has a negative dielectric anisotropy between a first substrate having a color filter, an electrode and a vertical alignment film, and a second substrate having an electrode and a vertical alignment film. In a vertical alignment type liquid crystal display device in which the liquid crystal is sandwiched and the alignment of the liquid crystal becomes a vertical direction when no voltage is applied, a projection for dividing the initial alignment direction of the liquid crystal into a plurality of portions is formed in a peripheral portion of a pixel region. A plurality of color elements of the color filter are formed so as to overlap with each other, and the protrusions are formed to be higher on the short side than on the long side of the pixel region.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the liquid crystal display device of this embodiment has at least a first electrode having an electrode and an alignment film.
A substrate 1, a second substrate 2 having at least a color filter, an electrode, and an alignment film, and a liquid crystal 3 having a negative dielectric anisotropy sandwiched between the substrates 1 and 2. And a polarizing plate 5 above and below the panel 4.
6 are arranged.

[0007] The polarizing plates 5 and 6 are arranged with their polarization axes orthogonal to each other. If the liquid crystal panel 4 is of a reflective type, the panel
The polarizing plate may be disposed only on one of the four light entrance / exit surfaces.

The first substrate 1 is composed of a thin film transistor array type substrate in which thin film transistors and pixel electrodes (both not shown) connected thereto are arranged in a matrix on a transparent substrate such as glass. ing. A vertical alignment film 7 is disposed on the surface of the transistor array substrate.

The second substrate 2 is a color filter in which R, G, and B color elements 8R, 8G, and 8B are arranged on the surface of a transparent substrate such as glass as shown in FIG. 3, a protective film 9 also serving as a flattening film, a transparent counter electrode 10, and a vertical alignment film 11 are sequentially laminated thereon as shown in FIG.

On the second substrate 2, projections 12 for dividing the initial alignment direction of the liquid crystal into a plurality of portions are formed corresponding to the periphery of the pixel region. The protruding portion 12 is formed by overlapping peripheral portions of the color elements 8R, 8G, and 8B of the color filter 8. This projection 12 is
As shown in FIG. 3, the height and the width are changed on the short side and the long side of the pixel region, and the height and the width of the short side 12S are made larger than the long side 12L. That is, the long side of the pixel area is based on the projection 8TL in which two color elements are overlapped, whereas the short side of the pixel area is based on the projection 8TS in which three (all) color elements are overlapped. Therefore, the height of the short side projection 12S is higher than the height of the long side projection 12L. The color filter 8
8 formed by overlapping adjacent color elements
The width of T is set to be substantially the same on the short side and the long side of the pixel region. However, since the height of the projection 8T is different, the width of the protective film 9, the counter electrode 10, and the The width of the inclined surface 12K that appears on both sides of the projection 8T due to the formation is such that the shorter side 12KS is longer than the longer side 12KL.

Due to the presence of the inclined surface 12K (12KS, 12KL) formed by being divided in four different directions around the pixel area, the initial alignment direction of the liquid crystal molecules 3M by the vertical alignment film 11 is changed in four directions of up, down, left and right. Divided. here,
When the planar shape of the pixel region is rectangular, the length of the protrusion 12 is different between the long side 12L and the short side 12S, but the width of the protrusion 12 is set to be shorter than the long side 12L. Since the length is made longer, the area difference between the four regions having different initial alignment directions can be reduced. As described above, the four inclined surfaces 12 having substantially the same area but different directions in one pixel region.
Since K is formed, the initial alignment direction of the vertically aligned liquid crystal molecules 3M can be dispersed in four directions, and when no voltage is applied, the liquid crystal molecules in the vertical state change to a horizontal or inclined state by the application of a voltage. In this case, the viewing angle dependency that occurs in such a case can be improved and the viewing angle can be widened.

In this case, the projection 12 for division can be formed by using an existing member only by making a slight change to the mask for exposure when forming the color filter 8. No additional parts or changes to the manufacturing process are required. Therefore, it can be easily manufactured using existing equipment.

The liquid crystal panel 4 can adopt other configurations such as a simple matrix system other than the thin film transistor system. Further, as the color filter 8, various types such as a pigment system and a dyeing system can be adopted.

[0014]

As described above, according to the present invention, the projection for setting the initial alignment direction required for improving the viewing angle dependency of the liquid crystal display is slightly changed in the mask of the color filter. Therefore, it is not necessary to separately add a member for a protruding portion or to add to a manufacturing process. Therefore, it can be easily manufactured using existing equipment. In particular, when the planar shape of the pixel region is rectangular, the height of the short side protrusion is set higher than the height of the long side protrusion, so the short side inclined surface (divided area) , And the difference between the area of the long side and the area of the inclined surface (divided region) on the long side can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a schematic configuration of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a color filter of the embodiment.

FIG. 3 is a sectional view of a main part of the liquid crystal display device of the embodiment,
(A) is a sectional view of a portion corresponding to AA in FIG. 2, (B)
FIG. 3 is a sectional view of a portion corresponding to BB in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 3 Liquid crystal 4 Liquid crystal panel 5 Polarizer 6 Polarizer 7 Vertical alignment film 8 Color filter 8T Projection 9 Protective film 10 Counter electrode 11 Vertical alignment film 12 Projection part 12K Slope

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masayuki Kameya 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Taku Ikemoto 3-201 Minamiyoshikata, Tottori City, Tottori Sanyo Electric Tottori F term (for reference) 2H090 HA16 LA04 MA01 MA15 2H091 FA02Z FA08X FA08Z FD04 FD06 FD08 GA06 GA13 LA19

Claims (2)

[Claims] 1. A liquid crystal display device in which a liquid crystal is sandwiched between a first substrate having a color filter, an electrode, and an alignment film, and a second substrate having an electrode and an alignment film, wherein the liquid crystal has a plurality of initial alignment directions. A liquid crystal display device, wherein a plurality of projections for dividing are formed by overlapping a plurality of color elements of the color filter on a peripheral portion of a pixel region. 2. A liquid crystal having a negative dielectric anisotropy is sandwiched between a first substrate having a color filter, an electrode, and a vertical alignment film, and a second substrate having an electrode and a vertical alignment film. In a vertical alignment type liquid crystal display device in which the orientation of the liquid crystal is vertical when no voltage is applied, a plurality of projections for dividing the initial alignment direction of the liquid crystal into a plurality of colors of the color filter are provided around a pixel region. The liquid crystal display device, wherein the elements are formed in an overlapping manner, and the protruding portion is formed so that the shorter side is longer than the longer side of the pixel region.