JPH04184323A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To lower the apparent presence feel of black matrices by substantially equaling the width between display electrodes and the width of auxiliary capacity electrodes and evenly dispersing the display regions to a plurality. CONSTITUTION:The auxiliary capacity electrodes 14 apparently divide the display electrodes 13 to a plurality and the width thereof is substantially equal to the spacing distance between the electrodes 13. On the other hand, the regions where light shielding films are formed are provided between the electrodes 13 and are so formed that the display parts D are as large as possible. The lines formed between the electrodes 13 are substantially the same as the regions formed of the light shielding films and these regions are one of the black stripes. The electrodes 14 are non-transparent and form the other of the black matrix. Then, these two black matrices form the gratings which are apparently evenly formed. The circumferences of the so-called display regions D are formed of the light shielding layers having a uniform width and since the regions D are divided into a plurality, the presence feel of the black matrices decreases.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a liquid crystal display device, and particularly relates to the structure of an auxiliary capacitor.

(b) Conventional technology In general, the development of liquid crystal display devices is progressing in a pinch because they can achieve low power consumption and large capacity.

However, when increasing the size of the screen and miniaturizing the pixel size, a large number of defects and mask misalignment occurred, resulting in an extremely low yield rate. Additionally, LCDs generally have the disadvantage that they are much harder to see than images on cathode ray tubes. Therefore, various companies are proposing various structures to solve this problem. Figure 2 is an example of this, and I will explain how.

First, there is an insulating transparent substrate 4, for example a glass substrate (50), and a gate line (51) is provided on this substrate. An auxiliary capacitance electrode (52), which is the subject of this application, is formed at the same time as the gate line (51) and is provided as shown by a broken line. On top of this is formed an active layer (53) made of a semiconductor layer covered with an insulating film made of a silicon nitride film or the like.

Here, this active layer (53) is made of, for example, amorphous silicon or polysilicon. Further, after the insulating stone is coated, a train electrode (f54) indicated by a solid line is formed on one side of the active layer (53), and a source electrode (55) indicated by a solid line is formed on the other side of the active layer (53). A display chamber 1'M (56) made of IT○ in contact with the electrode is formed. Here, this drain electrode is constructed integrally with the image line shown in figure number (57). In addition, the display room tfj
(56+, an alignment film covering the train electrode (54) and the transistor is formed.

On the other hand, the lower layer of another glass substrate facing the glass substrate (50) is formed with a common electrode and an alignment film. It has been stopped.

(c) Problems to be Solved by the Invention Here, the light shielding film is generally formed on the counter electrode substrate. However, when viewing a liquid crystal display device from an angle, parallax occurs and the transmitted light becomes visible, and the original effect of the light-shielding film, the so-called black matrix effect (avoiding color mixture by separating color pixels), may be lost. .

To solve this problem, there is a configuration in which a light shielding film is formed on a TPT substrate, which is the opposite of the configuration described above.

In either case, a light shielding film is generally provided between the display electrodes (56).

Now, considering the area that blocks light in Figure 2, the light shielding film provided between the auxiliary capacitor electrode (52) and the display electrode (56) shown by the broken line corresponds to the auxiliary capacitor electrode that actually becomes the display area. This blocking area is formed very widely around the area where (52) and the display chamber tf56) do not overlap, which causes the problem that the presence of the so-called black matrix becomes very noticeable.

Moreover, when this display device is applied to a liquid crystal projector, there is a problem in that the presence of the black matrix becomes even more noticeable as the image is enlarged.

(d) Means for solving the problems The present invention has been made in view of the above-mentioned problems.
The area of the display electrode that does not overlap with the auxiliary capacitance electrode (14) has a width substantially equal to the distance from the display electrode (13) to another adjacent display electrode (13), so that the area of the display electrode is substantially equally spaced.
This problem is solved by providing the auxiliary capacitance electrode (14).

(e) Effect The display lif! (13) The lines of the light-shielding film formed between and the lines of the auxiliary capacitor electrode (14) are evenly distributed on a grid as shown in FIG. The periphery of the area where the display electrodes (13) and the display electrodes (13) do not overlap, the so-called display area, is formed with a light-shielding layer of uniform width, and since the display area is divided into a plurality of parts, the apparent The presence of the black matrix decreases.

Kube) Example The present invention will now be described with reference to FIG.

First, there is an insulating transparent substrate (10), for example a glass substrate. On this glass substrate (10), gate electrodes' (11) (formed integrally with the gate line (12)) formed by Or sputtering are placed between the display electrodes (13) to be formed on the left and right sides. It is extended to . Moreover, at the same time as this gate voltage ffl+11], the auxiliary capacitance electrode (
14) is formed like a broken line.

Further, the entire surface of the substrate including the gate electrode (11) and the auxiliary capacitance electrode (14) is covered with a gate insulating film made of a silicon nitride film.

Further, on the gate insulating film corresponding to the gate electrode, a semiconductor active layer (15
) is provided.

Further, on the gate insulating film, a display electrode (1
3) is formed.

Contact layers made of N+ type amorphous silicon are formed at both ends of this semiconductor active layer (15). For convenience of the drawing, the contact layer is not shown, and an insulating layer is provided between the contact layers formed at both ends to prevent etching of the semiconductor active layer that occurs when etching the contact layer. A silicon nitride film is formed.

Furthermore, a source electrode (16) is formed between the contact layer corresponding to the source region and the display electrode, and a train line (17) is formed in the contact layer corresponding to the drain region.
A drain electrode (18) is formed integrally with the drain electrode (18). In addition, since the cell corresponds to one color, there are two display electrodes (13) adjacent to each other laterally.

(13) and the lower display electrode (13) have a triangular structure. The upper display electrode also has a triangular structure. Therefore, in reality, the drain line extends in a zigzag pattern in the vertical direction.

Furthermore, an alignment film is formed to cover the display electrode, source electrode, drain electrode, drain line, and transistor, and a common electrode and an alignment film are formed on the lower layer of the other glass substrate, and a The substrates are provided facing each other, and a liquid crystal is sealed between them.

Here, the light-shielding film is the glass substrate on which the transistor is formed (
10), or formed on a glass substrate on which a counter electrode is formed. The formation area is mainly provided in the area corresponding to between the display electrodes (13), and the overlapping area of the light shielding film and the display electrode (VjA+13) is minimized as much as possible so that one display area is as large as possible.

The feature of the present invention lies in the shape of the auxiliary capacitance electrode (14). When viewed in FIG. 1, this auxiliary capacitance electrode (14) apparently divides one display electrode (13) into a plurality of parts;
The width is substantially the same as the distance between the display electrode (13) and the adjacent display electrode tM (13).

As mentioned above, the region where the light shielding film is formed is located between the display electrodes (13)
The overlapping area of the light shielding film and the display electrodes (13) is minimized so that the display area is as large as possible, so the line formed between the display electrodes (13) is This area is substantially the same as the area formed by the film, and this area becomes one of the blank drives. Further, since the auxiliary capacitance electrode (14) is made of the same material as the gate electrode (11), it is non-transparent and serves as the other part of the black matrix. Therefore, these two black matrices form an apparently integral, uniformly formed lattice.

Here, the auxiliary capacitance electrode (14) and the display electrode (13)
) is formed to be very small due to the drawing, but in reality, if the radius A of the auxiliary capacitance electrode (14) is 1, one side B of the non-weight area is approximately 10-2
For example, one side of every 5 display areas is 50 μm for an apparent blank matrix with a width of 5 to 30 μm.
~200 μm. Therefore, the apparent width of the black matrix is narrower than in the conventional structure, and since one pixel is formed by being divided into a plurality of parts, the apparent presence of the black matrix is reduced.

Here, the display area is shown as a square, but it may be a rectangle, etc., and the number of divisions is not limited to 4, but 6, 8, etc.
Split... is fine, but the apparent display area is
All must be substantially the same size and evenly distributed.

(g) Effects of the invention As is clear from the above explanation, the apparent black matrix width is reduced, the width between the display electrodes and the width of the auxiliary capacitance electrode are made substantially the same, and the display area is divided into multiple equal parts. By dispersing it, the apparent presence of the black matrix can be reduced.

Therefore, even if a display device having this structure is applied to a projector, the presence of the display device can be far less than that of the conventional projector, and a clear image can be provided to the user.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the liquid crystal display device of the present invention, and FIG.
FIG. 2 is a plan view of a conventional liquid crystal display device.

Claims (4)

[Claims] (1) A plurality of gate lines and a plurality of image lines arranged in a matrix pattern, a transistor controlled by the gate line, and a transistor connected to the transistor and connected to the image line through the transistor. a liquid crystal cell comprising at least a display electrode to which an image signal is supplied; an auxiliary capacitance electrode made of an opaque material below the display electrode and supplementing the liquid crystal cell; and between the display electrode and the adjacent display electrode. In a liquid crystal display device having at least a light-shielding film provided for blocking light, the display electrode does not overlap with the auxiliary capacitance electrode and has a width substantially equal to the distance from the display electrode to another adjacent display electrode. A liquid crystal display device characterized in that the auxiliary capacitance electrodes are provided so that the regions are substantially equally spaced. (2) A plurality of gate lines and a plurality of image lines arranged in a matrix pattern, a transistor controlled by the gate line, and a transistor connected to the transistor and connected to the image line through the transistor. a liquid crystal cell comprising at least a display electrode to which an image signal is supplied; an auxiliary capacitance electrode made of an opaque material below the display electrode and supplementing the liquid crystal cell; and between the display electrode and the adjacent display electrode. In a liquid crystal display device having a light-shielding film provided for blocking light, the auxiliary capacitance of the display electrode is divided by the auxiliary capacitance electrode and a line equivalently formed between the display electrode and the adjacent display electrode. A liquid crystal display device characterized by uniformly disposing non-overlapping portions with electrodes. (3) A plurality of gate lines and a plurality of image lines arranged in a matrix pattern, a transistor controlled by the gate line, and a transistor connected to the transistor and connected to the image line through the transistor. a liquid crystal cell comprising at least a display electrode to which an image signal is supplied; an auxiliary capacitance electrode made of an opaque material below the display electrode and supplementing the liquid crystal cell; and between the display electrode and the adjacent display electrode. A liquid crystal display device having a light shielding film provided for shielding light, characterized in that the lines formed by the light shielding film and the lines formed by the auxiliary capacitor electrode form an apparently uniform lattice. LCD display device. (4) The liquid crystal display device according to claim 1, 2 or 3, wherein the light shielding film is formed on at least one of a pair of glass substrates constituting the liquid crystal display device.