JPH0943630A - Liquid crystal panel substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal panel substrate for a bright liquid crystal display device by improving an opening ratio. SOLUTION: Electrode wires 11r, 11g, 11b connected with switching elements 12r, 12g, 12b of each image electrode are arranged around multiple image electrodes 13r, 13g, 13b formed in a matrix form on a substrate surface and are wired together with every plural wires laminated in multilayers.

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, and more particularly to a liquid crystal panel substrate used in an active matrix type device.

[0002]

2. Description of the Related Art A liquid crystal display device is constructed by disposing a liquid crystal layer between a pair of substrates with electrodes facing each other, and applying a voltage between the electrodes to control the electro-optical characteristics of the liquid crystal layer.

An active matrix type device, which is a kind of liquid crystal display device, has a large number of independent pixel electrodes arranged in a matrix on one glass substrate, and electrode lines wired between the electrodes and switching elements attached to each pixel electrode. Connected through. 1 for each pixel electrode surface and the counter electrode on the counter substrate
Since the liquid crystal layer cannot be controlled in the region where the pixel region is formed and the electrode lines are wired, the light shielding layer is formed in the non-control region while leaving the pixel region in the shape of a lattice window.

That is, FIGS. 4A and 4B explain a conventional liquid crystal panel substrate, in which the red pixel electrode 3 is shown.
r, the green pixel electrode 3g, and the blue pixel electrode 3b are arranged in parallel, and the red signal line 1a, the green signal line 1g, and the blue signal line 1b are arranged on the right side of these electrodes, and further, the gate line is formed under the pixel electrode. 4 is wired, and the TFT transistor 2 of each pixel electrode
It is connected to the pixel electrode via r, 2g and 2b.

As described above, since the liquid crystal layer is not controlled in the area of the electrode line wired for each pixel electrode, it is covered with a light shielding layer to prevent light leakage. Since the wiring is independently formed on the substrate, the area of the wiring becomes large, and the width of the light-shielding layer is widened correspondingly, so that the aperture ratio of the lattice window is reduced.

The aperture ratio is at most about 50%, and it was difficult to improve the aperture ratio in the above structure.

[0007]

In the liquid crystal display device, it is desired to brighten the display screen, and it is difficult for the conventional device to obtain a bright display due to the limitation of the aperture ratio.

It is an object of the present invention to obtain a liquid crystal panel substrate for a bright display liquid crystal display device by improving the aperture ratio.

[0009]

First, the present invention provides a substrate, a plurality of pixel electrodes formed in a matrix on the surface of the substrate, and electrodes arranged around the pixel electrodes on the glass substrate. In a liquid crystal panel substrate including a line and a switching element that is provided for each pixel electrode on the substrate and connects the pixel electrode to the electrode line, the electrode lines are wired in a plurality of layers in a multi-layered manner. To obtain a liquid crystal panel substrate.

Secondly, the present invention relates to a gate electrode connected to the gate line, a source electrode connected to the signal line, and a pixel electrode in which the switching element is composed of a plurality of gate lines and signal lines. A thin film transistor having a drain electrode to be connected, wherein a plurality of signal lines are laminated and wired in multiple layers to obtain a liquid crystal panel substrate.

A third aspect of the present invention is that a set of a plurality of pixel electrodes is 1
A liquid crystal panel substrate is described, in which color pixels are formed and signal lines are laminated in multiple layers for each color pixel.

In a fourth aspect of the present invention, the electrode lines are signal lines,
Switching element is connected between signal line and pixel electrode 2
A terminal type non-linear resistance element for obtaining a liquid crystal panel substrate in which the signal lines are laminated in multiple layers.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the liquid crystal panel substrate of the present invention, for example, a plurality of signal lines of each pixel electrode are grouped together and wired in multiple layers in the same substrate region to increase the area of the pixel electrode occupied in the substrate. The aperture ratio is increased by narrowing the width of the light shielding layer in the area where there is no wiring between the electrodes.

1 to 3 show an embodiment of the present invention.

FIG. 1 shows a liquid crystal panel using the liquid crystal panel substrate 10 of this embodiment shown in FIG.
A liquid crystal layer 30 is disposed between the counter substrate 20 and the counter substrate 20. A pair of color filters 21 including a red filter 21r, a green filter 21g, and a blue filter 21b is formed on the surface of the counter substrate 20 on the liquid crystal layer side, a light shielding layer 22 is formed between these finators, and a cut line is formed on the filter 21. Common counter electrode 23 and alignment film 2 made of transparent conductive film without
4 are formed. A red pixel electrode 13r, a green pixel electrode 13g, and a blue pixel electrode 13b are formed on a transparent substrate 10a made of, for example, glass of the liquid crystal panel substrate 10, and an electrode line 11 is wired around the pixel electrode 13r. It is provided.

2 and 3 illustrate the liquid crystal panel substrate 10 in detail. In FIG. 2A and FIG. 2B, a part of the pixel electrodes arranged in a matrix on the substrate is shown as one color pixel A.
The liquid crystal panel substrate 10 is shown as a representative of the three pixel electrode trios 13r, 13g, and 13b constituting the. These electrodes form a pixel region of each color with the red pixel electrode 13r, the green pixel electrode 13g, and the blue pixel electrode 13b. The pixel electrodes are directly adjacent to each other, and
These are thin film transistors, ie, TFTs 12R, 12G, 12 which are switching elements attached to each pixel electrode.
The signal lines 11r, 11g, and 11b connected via b are wired between the electrodes of the adjacent color pixels B.

The signal lines are shown extending vertically in the figure, and as shown in FIG. 3A, the signal line 11b for the pixel electrode for green is arranged in order from the signal line 11b for the pixel electrode for blue on the lowermost layer. ,
Insulating layer 1 is multiplexed with the signal line 11r of the uppermost red pixel electrode.
11 are laminated via.

The gate lines 14 of these pixel electrodes are shown in FIG.
It extends in the lateral direction along the lower side of each pixel electrode and is commonly connected as a gate electrode to the TFTs 13r, 13g, 13b of each pixel electrode.

FIG. 3B is a TFT near the TFT 12b of the blue pixel electrode 13b closest to the common wiring area of each signal line.
The structure and the connection between the wiring and the pixel electrode 13b are shown. The TFT 12b is a TFT transistor having an inverted staggered structure, and the gate line 1 also serving as the gate electrode of the transistor.
4 has a gate insulating layer 141 on which a semiconductor layer 15b made of an a-Si film is formed. This semiconductor layer 15
The blue pixel electrode 13b is provided at a constant distance from b, and the metal layer 16b is deposited on the semiconductor layer 15b and the pixel electrode 13b to connect them. This metal layer 16
b forms the drain electrode of the transistor.

From the signal line common wiring area to the blue signal line 11b
1 extends in a direction orthogonal to the common wiring region along the gate line, reaches the TFT 13b, and is connected to the semiconductor layer 15b with the metal layer 16b at a constant interval. This connecting portion serves as the source electrode of the transistor.

FIG. 3C shows the TFT 12g of the green pixel electrode.
The TFT structure in the vicinity and the connection state between the wiring and the pixel electrode 13g are shown. The TFT 12g is a TFT transistor having an inverted stagger structure, and has a gate insulating layer 142 on the gate line 14 which also serves as the gate electrode of the transistor, and a semiconductor layer 15g made of an a-Si film is formed thereon. The green pixel electrode 13g is spaced from the semiconductor layer 15g by a certain distance.
The semiconductor layer 15g and the pixel electrode 13g are provided.
A metal layer 16g is deposited on the top to connect the two. This metal layer 16g forms the drain electrode of the transistor.

From the signal line common wiring area to the green signal line 11g
1 is stacked on the blue signal line 11b1 and branched and extended along the gate line 14 in the orthogonal direction, reaches the TFT 12g through the TFT 12b, and the metal layer 1 is formed on the semiconductor layer 15g.
6g is connected at a constant interval. This connecting portion serves as the source electrode of the transistor.

FIG. 3D shows the TFT 12r of the red pixel electrode.
The TFT structure in the vicinity and the connection state between the wiring and the pixel electrode 13r are shown. The TFT 12r is an inverted staggered TFT
A gate insulating layer 143 is provided on a gate line 14 which is a transistor and also serves as a gate electrode of the transistor, and a semiconductor layer 15r made of an a-Si film is formed thereon. The red pixel electrode 13 is spaced at a constant distance from the semiconductor layer 15r.
r, the semiconductor layer 15r and the pixel electrode 13 are provided.
A metal layer 16r is deposited on r to connect them. This metal layer 16r forms the drain electrode of the transistor.

From the signal line common wiring area to the red signal line 11r
1 is stacked on the blue signal line 11b1 and the green signal line 11g1 and the gate line 14 is formed in the direction orthogonal to the common wiring region.
Is branched and extended along with
r, the semiconductor layer 15r is connected to the metal layer 16r at a constant interval. This connecting portion serves as the source electrode of the transistor.

As shown in FIG. 2B, a scanning signal is applied to the gate line 14 and a data signal is applied to the signal line 11 of each color, whereby the TFT switching elements 12r, 1 are formed.
2g and 12b are switched, and the pixel electrodes 13r and 13
A voltage is selectively applied to g and 13b. Therefore,
A voltage is applied between the common counter electrodes, and the liquid crystal layer 3 in the application region is applied.
0 is electro-optically controlled and operates as a light switch or light valve.

As shown in FIG. 1B, the pixel electrode 13
The light-shielding layer 22 formed around the color filters 21r, 21g, and 21b, which are formed in a one-to-one correspondence with r, 13g, and 13b, has a wide layer 221 in a region where wiring is provided and between pixel electrodes without wiring. Area is formed in the narrow layer 222.
The aperture ratio formed by the light shielding layer 22 is 75%, for example, which is 1.5 times higher than that of the conventional panel.

As described in the above embodiment, by stacking the electrode wires in multiple layers, it is possible to reduce the area ratio of the area of the electrode wires on the glass substrate and increase the aperture ratio. .

The present invention uses a TFT as a switching element.
Not only can it be applied to a liquid crystal panel substrate using a two-terminal type non-linear resistance element such as an MIM element. M
Although only the signal lines are wired on the panel substrate on which the IM elements are arranged, the signal line common wiring regions are collectively stacked in one place for each pixel electrode trio that forms a plurality of pixel electrodes, for example, one color pixel, and is laminated in multiple layers. As a result, the area of the wiring region occupied in the substrate can be reduced and the aperture ratio can be increased.

[0029]

According to the present invention, the area of the wiring region of the electrode line on the substrate can be reduced and the area of the pixel electrode can be increased.
The aperture ratio can be improved.

[Brief description of drawings]

1A is a partial cross-sectional view showing an embodiment of the present invention, FIG. 1B is a partial plan view of a counter substrate, FIG.

2A is a partial plan view of a liquid crystal panel substrate according to an embodiment of the present invention, FIG. 2B is an equivalent circuit diagram of FIG.

3 (a), (b), (c) and (d) are schematic sectional views showing a part of FIG. 2;

FIG. 4 shows a conventional device, (a) is a partial plan view,
(B) is an equivalent circuit diagram of (a).

[Explanation of symbols]

 10: Liquid crystal panel substrate 10a: Substrate 11r, 11g, 11b: Signal line 12r, 12g, 12b: TFT 13r, 13g, 13b: Pixel electrode 14: Gate line

Claims (4)

[Claims] 1. A substrate, a plurality of pixel electrodes formed in a matrix on the surface of the substrate, electrode lines wired around the pixel electrodes on the substrate, and each pixel electrode on the substrate. A liquid crystal panel substrate comprising a switching element which is provided and connects the pixel electrode to the electrode line, wherein a plurality of the electrode lines are laminated and wired in multiple layers. 2. An electrode line is composed of a plurality of gate lines and a signal line, respectively, and a switching element is connected to the gate line, a gate electrode, a source electrode connected to the signal line,
The liquid crystal panel substrate according to claim 1, wherein the liquid crystal panel substrate is a thin film transistor having a drain electrode connected to a pixel electrode, and a plurality of the signal lines are laminated and wired. 3. The liquid crystal panel substrate according to claim 1, wherein one color pixel is formed by a set of a plurality of pixel electrodes, and a signal line is laminated in multiple layers for each one color pixel. 4. The electrode line is a signal line, the switching element is a two-terminal type non-linear resistance element connected between the signal line and the pixel electrode, and the signal line is laminated in multiple layers. The liquid crystal panel substrate described.