JP2001281679A - Active matrix type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an active matrix type liquid crystal display device, in which generation of lateral stripes on the display caused by a feeding wiring structure is eliminated. SOLUTION: In the matrix type liquid crystal display device including plural scanning wirings, plural signal wirings, plural switching elements disposed in first crossing parts of the scanning wirings and the signal wirings, plural common wirings disposed in parallel with the scanning wirings and plural feeding wirings disposed in parallel with the signal wirings, the common wirings 2a and the feeding wirings 3a' are electrically connected directly to each other in the same layer and the scanning wirings 1a and the feeding wirings 3a' are not connected to each other, at second crossing parts of the scanning wirings 1a, and the feeding wirings 3a' and the scanning wirings 1a are connected to each other in a layer, where the feeding wirings are not wired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal display device using an IPS system.

[0002]

2. Description of the Related Art In recent years, in an active matrix driving type liquid crystal display device using a thin film transistor as a switching element, a liquid crystal display device called an IPS (In-Plain Switching) type has been developed. IPS
An active matrix type liquid crystal display device applies an electric field in a horizontal direction to a substrate by applying a voltage between two electrodes arranged in parallel on a substrate in order to apply a voltage to the liquid crystal. In some cases, display is performed by controlling the polarization of light passing through a liquid crystal panel by controlling the orientation of liquid crystal molecules.

This method uses a conventional counter electrode type TFT.
(Thin Film Transistor) Unlike a liquid crystal panel, a plurality of common wirings which are arranged substantially in parallel with a plurality of scanning wirings are required. FIG. 1 shows a conventional configuration for feeding common wirings and scanning wirings on an array substrate in an IPS active matrix type liquid crystal display device, and FIG. 2 is a cross-sectional view taken along a broken line YY 'in FIG.

As shown in FIG. 1, scanning lines 1a are arranged in parallel as gate electrode layers on a substrate 00, and common lines 2a are alternately arranged in parallel with the scanning lines 1a.

Then, as shown in FIG. 2, an insulating film 10 is formed so as to cover them, a power supply wiring 3a is provided as a source / drain layer via an a-Si film 20, and a common wiring 2a and a power supply wiring 3a are provided. Is provided with a contact hole 30 for electrically connecting.

As described above, in order to supply power to the common wiring 2a, the power supply wiring 3a (source / drain layer) and the common wiring 2a (gate electrode layer) formed on the substrate are electrically connected via the contact hole 30. It has a configuration to be connected.

[0007]

However, in the above-described power supply structure, impurities and the like existing at the interface between the gate electrode layer and the source / drain layer which are electrically connected by the contact hole 30 are required. It is also conceivable that the power supply resistance increases. In this case, it is considered that a sufficient voltage cannot be supplied to the common wiring 2a. If the supply of the voltage is insufficient, there is a problem in image quality such that a horizontal line of black stripes is generated when displaying on the screen. Had the problem of

An object of the present invention is to solve the above-mentioned problems, and to provide an active matrix type liquid crystal display device in which the power supply structure of the common wiring is made contactless and there is no problem in image quality. I do.

[0009]

In order to achieve the above object, an active matrix type liquid crystal display device according to the present invention comprises: a plurality of scanning lines; a plurality of signal lines; In an active matrix type liquid crystal display device including a plurality of switching elements arranged at the intersection, a plurality of common wirings arranged in parallel with the scanning wiring, and a plurality of power supply wirings arranged in parallel with the signal wiring, The wiring and the power supply wiring are directly electrically connected in the same layer, the scanning wiring and the power supply wiring are not connected at the second intersection of the scan wiring and the power supply wiring, and the scan wirings are connected to each other in a different layer from the power supply wiring. Are connected.

With this configuration, the power supply resistance does not fluctuate due to impurities or the like at the interface between the gate electrode layer and the source / drain layer, and the problem of image quality such as the occurrence of black stripes in a row due to insufficient voltage supply. It is possible to provide an active matrix type liquid crystal display device having no such device.

Further, in the active matrix type liquid crystal display device according to the present invention, it is preferable that the scanning lines are connected to each other in the layer where the signal lines are formed at the second intersection between the scanning lines and the power supply lines. This is to prevent the liquid crystal panel itself from becoming unnecessarily thick.

Further, in the active matrix type liquid crystal display device according to the present invention, an insulating film is provided at the second intersection of the scanning wiring and the power supply wiring so as to cover the power supply wiring, and the scanning wirings are connected to each other. It is preferable to include a contact hole and a bridge wiring for connecting the contact holes on the insulating film. This is to prevent the scanning wiring and the power supply wiring from being directly electrically connected.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an active matrix type liquid crystal display according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a configuration diagram of the power supply to the common wiring and the scanning wiring on the array substrate in the active matrix type liquid crystal display device according to the embodiment of the present invention, and FIG. 4 is a configuration sectional view taken along a broken line XX ′ of FIG. It is.

In FIG. 3, 1a is a scanning wiring, 2a is a common wiring, 3a 'is a power supply wiring, 4a is a signal wiring,
5a indicates a switching element, and 6a indicates a bridge wiring.

In the present embodiment, as shown in FIG. 3, scanning lines 1a are arranged as gate electrode layers on a substrate 00, and common lines 2a are alternately arranged so as to be parallel to the scanning lines 1a. I have. Further, a power supply wiring 3a 'is arranged so as to be electrically connected directly to the common wiring 2a and to be perpendicular to the common wiring 2a. Therefore, the common wiring 2a and the power supply wiring 3a 'are arranged on the same layer.

Then, as shown in FIG. 4, an insulating film 10 is formed so as to cover these, and an a-Si film 20 is interposed therebetween.
A bridge wiring 6a parallel to the scanning wiring 1a is arranged as a source / drain layer, and the bridge wiring 6a and the scanning wiring 1a are arranged.
Is provided with a contact hole 30 for electrically connecting.

With this configuration, the scanning wiring 1a and the power supply wiring 3a 'are not directly connected, and the common wiring 2a and the power supply wiring 3a' are directly electrically connected (the contact hole 30 is not connected). Therefore, it is not considered that the power supply resistance fluctuates due to impurities and the like seen in the conventional power supply configuration.

Therefore, it is not considered that a sufficient voltage cannot be supplied to the common wiring 2a, and there is no possibility that a problem in image quality such as generation of a black line in a row due to insufficient voltage supply will occur.

Further, the active matrix type liquid crystal display device according to the present embodiment can be manufactured by the following manufacturing method. First, aluminum is vapor-deposited on a transparent glass substrate 00 so as to have a thickness of 0.5 μm by a sputtering apparatus.

Next, aluminum is patterned by photolithography to form a scanning line 1a, a common line 2a, and a power supply line 3a '. A silicon nitride film and an a-Si film 20 are deposited thereon as an insulating film 10, and an aluminum film is further formed thereon, followed by patterning by photolithography to form a bridge wiring 6a, and contacting by dry etching. A hole 30 is formed.

In the liquid crystal display device using the active matrix type liquid crystal display panel manufactured by the above-described manufacturing method, it has been confirmed that the above-mentioned horizontal stripes on the display are not seen in the image inspection.

As described above, according to the present embodiment, the configuration for supplying power to the common wiring does not pass through the contact hole, and the configuration for supplying power to the scanning wiring passes through the contact hole. Thus, it is possible to provide an active matrix type liquid crystal display device which does not cause a change in power supply resistance due to the above-mentioned factors and does not have a problem in image quality such as generation of black streaks in a horizontal row due to insufficient voltage supply.

[0023]

As described above, according to the active matrix type liquid crystal display device according to the present invention, in the IPS system, the power supply to the common wiring is configured not to pass through the contact hole, and the power supply to the scanning wiring is changed to the contact. An active matrix type liquid crystal display device having a configuration in which the power supply resistance does not fluctuate due to impurities and the like and has no problem in image quality such as occurrence of black streaks in a horizontal line due to insufficient voltage supply by adopting a configuration through holes. Can be provided.

[Brief description of the drawings]

FIG. 1 is a power supply configuration diagram for a common wiring and a scanning wiring at a pixel terminal in a conventional IPS type active matrix liquid crystal display device.

FIG. 2 is a cross-sectional view of a power supply component for a common wiring and a scanning wiring at a pixel terminal in a conventional IPS type active matrix liquid crystal display device.

FIG. 3 is a power supply configuration diagram for a common wiring and a scanning wiring at a pixel terminal portion in the active matrix type liquid crystal display device according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of a power supply component for a common wiring and a scanning wiring at a pixel terminal in an active matrix type liquid crystal display device according to an embodiment of the present invention.

[Explanation of symbols]

 1a scanning wiring 2a common wiring 3a power supply wiring (source drain layer) 3a 'power supply wiring (gate electrode layer) 4a signal wiring (source drain layer) 5a switching element 6a bridge wiring (source drain layer) 00 glass substrate 10 insulating film (nitriding) Silicon) 20 a-Si film 30 contact hole

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Mitsuhiro Uno 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 2H092 GA14 GA24 GA29 GA30 JA46 JB22 JB31 JB38 JB56 KB24 MA05 MA13 NA01 NA02 NA28 5C094 AA02 BA03 BA43 CA19 DA15 EA03 EA04 EA07 EA10 FA02

Claims (3)

[Claims] A plurality of scanning lines; a plurality of signal lines;
A plurality of switching elements arranged at a first intersection between the scanning wiring and the signal wiring; a plurality of common wirings arranged in parallel with the scanning wiring; and a plurality of common wirings arranged in parallel with the signal wiring. In the active matrix type liquid crystal display device including the power supply wiring, the common wiring and the power supply wiring are directly electrically connected in the same layer, and at a second intersection of the scanning wiring and the power supply wiring, An active matrix type liquid crystal display device, wherein the scanning lines are connected to each other in a layer different from the power supply lines without connecting the scanning lines to the power supply lines. 2. The active matrix liquid crystal display device according to claim 1, wherein the scanning lines are connected to each other at a layer where the signal lines are formed at the second intersection between the scanning lines and the power supply lines. . 3. A contact hole for connecting the scanning lines to each other, wherein an insulating film is provided at the second intersection between the scanning line and the power supply line so as to cover the power supply line, and a contact hole for connecting the scan lines. 2. The active matrix liquid crystal display device according to claim 1, further comprising a bridge wiring connecting between the insulating films on the insulating film.