JP2993105B2 - LCD panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to improvement in image quality and stable purchase of color liquid crystal panels using two-terminal elements.

[Related Art] In recent years, large-capacity matrix color liquid crystal panels have begun to be used for personal computer displays and the like. When these liquid crystal panels are classified according to the address method, they can be classified into a simple matrix method, an active matrix method, an optical address method, and the like. In view of the above, the active matrix system has come to be marketed as a high-quality, large-capacity display. A typical active matrix color liquid crystal panel is a TFT liquid crystal panel using amorphous silicon or polysilicon. In addition, a two-terminal element that has a simple manufacturing process and high yield and low cost is expected to be manufactured. A typical two-terminal element is a MIM liquid crystal panel. Hereinafter, the description will be made using the MIM panel as an example.

FIG. 2 is a diagram showing a panel structure of a conventional MIM color liquid crystal panel. MIM substrate 26 with lower deflection plate 25 attached
Tantalum line 22, MIM element 24, ITO pixel electrode
21 and the like are formed, on which an alignment film 28 is formed. On the color filter substrate 213 across the liquid crystal layer 29, an ITO electrode
212, a color filter layer 211, an alignment film 210, and the like are formed. On the color filter substrate 213, an upper polarizer 214
Is pasted.

FIG. 3 is a sectional view of a conventional MIM color liquid crystal panel. The color filter substrate 213 has ITO on the MIM substrate 26.
A color filter layer 34 is formed so as to face the pixel electrode 21, and a black matrix 35 is formed between the color filter layers 34.

FIG. 4 is a sectional view of another embodiment of the conventional MIM color liquid crystal panel. The color filter substrate 213 has a MIM substrate
The color filter layer 3 faces the ITO pixel electrode 21 on
4 are formed, and a black matrix 35 is formed between the color filter layers 34. Unlike FIG. 3, the color filter layer 34 and the black matrix 35
Do not overlap.

[Problems to be Solved by the Invention] However, the conventional MIM color liquid crystal panel has the following disadvantages.

If the MIM element and the black matrix are formed on different substrates, light obliquely incident on the panel may hit the MIM element or tantalum pentoxide on the wiring line, causing a shift in characteristics.

Black matrix 3 on color filter substrate 213
Since the step formed by 5 and the color filter layer 34 is very large, an area that is not rubbed in the rubbing step is formed,
Since the orientation is not stable, partial domains are easily formed.

Since the MIM element is bare, the element characteristics change due to dirt in the panel assembly process, scratches in the rubbing process or static electricity, and pixels are likely to be missing.

Color filter layer 34 on color filter substrate 213
In the structure shown in FIG. 4 where the black matrices 35 and the black matrices 35 do not overlap, light leaks from the boundary 41 between the color filter layer 34 and the black matrix 35, but the contrast is reduced.

[Means for Solving the Problems] The present invention relates to a liquid crystal panel in which a two-terminal element is formed on one of a pair of substrates.
A black matrix including an organic film formed on the two-terminal element and a wiring connected to the two-terminal element;
And a pixel electrode formed on the black matrix.

FIG. 1 is a sectional view of a MIM color liquid crystal panel according to a reference example of the present invention. The black matrix 11 is formed of black carbon. Since the MIM elements 24 and the wiring lines are covered with the black matrix 11, it is possible to prevent rubbing from being stained or damaged, and from being damaged by static electricity. Since the black matrix also covers the wiring lines, a high voltage is not applied to the liquid crystal on the wiring lines, and the reliability is improved. The black matrix 11 has the same effect as that obtained by mixing not only black carbon but also dye black, pigment black or the like with an organic resin.

FIG. 5 is a sectional view of a MIM color liquid crystal panel, which is another reference example of the present invention. The black matrix 51 is formed of a chromium thin film.

An insulating layer 52 is formed on the element 24 and the wiring line, and a black matrix 51 is formed thereon. The step formed by the black matrix 51 is very small, and there is no problem in rubbing or the like. Instead of chromium, it may be formed of tantalum or another metal thin film.

If not only the black matrix but also the color filter layer is formed on the substrate side, the total yield will drop extremely.
The reason is that the yield of the color filter is applied to the yield of the MIM process. Therefore, it is desirable to make them on separate substrates from the viewpoint of the yield.

FIG. 6 is an embodiment of the present invention and is a sectional view of a MIM color liquid crystal panel. The black matrix 61 is formed of an organic film containing a pigment. Element 24 and wiring line 22
A black matrix 61 is formed thereon, and a pixel electrode 62 is further formed thereon. The step formed by the black matrix 61 is very small and does not cause a problem in rubbing or the like.

[Effects of the Invention] The present invention has the following effects.

(A) Since the black matrix made of the organic film is arranged on the two-terminal element and the wiring on one substrate, the poorly-aligned region around the pixel electrode can be covered with the black matrix, and the display quality is improved. be able to.

(B) Since the black matrix is arranged on the element and the wiring on one substrate, it is necessary to form the black matrix wider in consideration of misalignment as compared with the case where the black matrix is arranged on the other substrate. Therefore, the aperture ratio can be improved.

(C) Since the black matrix is arranged between the two-terminal element and the wiring and the pixel electrode, the pixel electrode is prevented from being affected by electrolysis from the two-terminal element and the wiring by the black matrix. And the generation of domains due to a lateral electric field or the like can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a MIM color liquid crystal panel according to a reference example of the present invention. FIG. 2 is a diagram showing a panel structure of a conventional MIM color liquid crystal panel. FIG. 3 is a sectional view of a conventional MIM color liquid crystal panel. FIG. 4 is a sectional view of another embodiment of the conventional MIM color liquid crystal panel. FIG. 5 is a sectional view of a MIM color liquid crystal panel, which is another reference example of the present invention. FIG. 6 is an embodiment of the present invention and is a sectional view of a MIM color liquid crystal panel. 25: Chromium 27: Tantalum oxide film

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-54217 (JP, A) JP-A-2-234123 (JP, A) JP-A-3-94232 (JP, A) JP-A-4- 86809 (JP, A) Hikaru Hei 2-71822 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G02F 1/1335 G02F 1/136

Claims (1)

(57) [Claims] 1. A liquid crystal panel in which a two-terminal element is formed on one of a pair of substrates, wherein the one terminal is formed on the two-terminal element and a wiring connected to the two-terminal element. A liquid crystal panel comprising: a black matrix made of an organic film; and a pixel electrode formed on the black matrix.