JP2001100249A - Liquid crystal display panel and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display panel high in manufacturing yield and display quality by improving the display quality by relieving defective pixels resulting from a pattern abnormality or the like on the manufacture of a liquid crystal display panel. SOLUTION: In this liquid crystal panel, a common capacity pattern 7 forming a capacity across a common electrode wiring 6, and a pattern connected to a drain electrode of a thin film transistor 3 arranged at a part intersecting gate wiring are connected to a pixel electrode via individually independent pattern wiring 11, 12 and the same contact 8. Also a superposing pattern 9 flatly superimposed on a gate electrode directly connected to the common capacity pattern 7 is formed, and it is the respective patterns 7, 9 can be cut from each other, be connected to the gate wiring and combined with each other, so that a luminescence defective pixel can be made in to a dark pixel to improve the display quality and the manufacturing yield.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display panel and a method for manufacturing the same.

[0002]

2. Description of the Related Art Each pixel of a liquid crystal display panel using a thin film transistor (TFT) is, as shown in FIG.
A plurality of scanning signal lines 1; a plurality of video signal lines 2 intersecting with the scanning signal lines 1;
A plurality of scanning signal lines 1 and a plurality of video signal lines 2, and a pixel electrode connected to a drain electrode of the thin film transistor 3. 5 and a common capacitance pattern 7 connected to the pixel electrode 5 and forming a capacitance with the common electrode wiring 6. The scanning signal wiring 1 forms a gate electrode of the thin film transistor 3.

[0003]

Usually, the above-mentioned common electrode wiring 6 is connected to the counter electrode of the color filter substrate facing the array substrate on which the thin film transistor 3 is formed. If, for example, the common capacitance pattern 7 and the common electrode wiring 6 are electrically short-circuited, the potential of the pixel becomes the same as that of the common electrode, and a normal normally white liquid crystal display panel has a bright spot defect.

Further, since the scanning signal wiring 1, the thin film transistor 3 and the common capacitance pattern 7 are formed of the same layer of conductive material wiring, they are liable to be short-circuited due to a defect or the like generated in the production of the liquid crystal display panel. In this case, as in the above case, a normal normally white liquid crystal display panel has a defective bright spot. An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a liquid crystal display panel capable of relieving a luminescent spot defect generated by a defect or the like generated on a liquid crystal display panel and a method of manufacturing the same. I do.

[0005]

According to the present invention to solve the above-mentioned problems, a common capacitance pattern for forming a capacitor with a common electrode wiring is connected to a drain electrode of a thin film transistor (TFT) provided at a portion intersecting a gate wiring. The pattern has a structure in which each pattern wiring is independent pattern wiring and is connected to the pixel electrode via the same contact, and a pattern is formed which overlaps with the gate electrode directly connected to the common capacitance pattern, and each pattern is formed. Disconnecting,
By connecting the pixel electrode to the gate electrode wiring in combination with the connection to the gate wiring, the pixel which is a bright spot is turned into a black dot, the display quality is improved, and the yield is improved.

In the liquid crystal display panel of the present invention, liquid crystal is sealed between a pair of glass substrates, one of the glass substrates is provided with a counter electrode substrate, and the other of the glass substrates is provided with a plurality of scanning signal wirings and the scanning signal wiring. A plurality of video signal wirings intersecting with the signal wirings, a common electrode wiring wired in parallel with the plurality of scanning signal wirings, and a thin film transistor provided at a portion where the plurality of scanning signal wirings and the plurality of video signal wirings intersect And a pixel electrode connected to the drain electrode of the thin film transistor via a contact, and a common capacitance pattern forming a capacitance with a common electrode line connected to the pixel electrode. The capacitor pattern is connected to the pixel electrode via a second pattern wiring different from the first pattern wiring connecting the drain electrode and the pixel electrode. Is characterized in that a scan signal wiring and superimposed patterns overlap each other via the interlayer insulating film to form a gate electrode of the thin film transistor connected to the pixel electrode of the same pixel.

Further, the superposed pattern projects from the common capacitance pattern to the side of the scanning signal wiring in a plane, and intersects with the scanning signal wiring. Further, a capacitance between the scanning signal wiring of the overlapping pattern and a parasitic capacitance formed between the thin film transistor connected to the pattern and the gate wiring is not more than the capacitance.

Further, the capacitance between the scanning signal wiring of the overlapping pattern and one of the storage capacitors formed between the common capacitance pattern connected to this pattern and the common electrode wiring is one.
It is characterized by being 1/0 or less. Further, according to the method of manufacturing a liquid crystal display panel of the present invention, the first pattern wiring of the defective pixel in any one of the above liquid crystal display panels is cut and overlapped with the scanning signal wiring via an interlayer insulating film. It is characterized in that the pattern and the interlayer insulating film are destroyed and electrically connected to each other to make the display of the defective pixel black and difficult to recognize.

Further, according to the method of manufacturing a liquid crystal display panel of the present invention, the second pattern wiring of the defective pixel in any one of the above liquid crystal display panels is cut, and at the same time, the partial pattern wiring is partially interposed via the scanning signal wiring and the interlayer insulating film. The defective pattern is blackened to make it difficult to recognize the defective pixel by breaking the interlayer insulating film and electrically connecting the overlapping pattern with the overlapping pattern.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a liquid crystal display panel according to the present invention will be described based on specific embodiments. (Embodiment 1) FIGS. 1 to 3 show (Embodiment 1).

The same components as those of the prior art shown in FIG. 4 will be described with the same reference numerals. Hereinafter, the liquid crystal display panel will be described as a normally white mode. The liquid crystal display panel of the present invention includes a liquid crystal sealed between a pair of glass substrates, a counter electrode substrate provided on one of the glass substrates, and a plurality of scanning signal wirings 1 provided on the other of the glass substrates. 1, a plurality of video signal wirings 2, a common electrode wiring 6 wired in parallel with the plurality of scanning signal wirings 1, and a portion where the plurality of scanning signal wirings 1 and the plurality of video signal wirings 2 intersect. , A pixel electrode 5 connected to a drain electrode of the thin film transistor 3 via a contact, and a common capacitance pattern 7 connected to the pixel electrode 5 and forming a capacitance with a common electrode wiring 6. It is configured by forming pixels.

As further shown in FIG. 1, the drain electrode 4 and the pixel electrode 5 of the thin film transistor 3 are connected to each other via a first pattern wiring 11 and a contact 8, and form a common electrode forming a capacitor with the common electrode wiring 6. The capacitance pattern 7 is connected to the pixel electrode 5 via the second pattern wiring 12 and the contact 8. The capacitance between the overlapping pattern 9 and the scanning signal wiring 1 is equal to or smaller than the parasitic capacitance formed between the thin film transistor 3 connected to this pattern and the gate wiring in order to suppress the penetration effect.

The capacitance between the overlapping pattern 9 and the scanning signal line 1 is reduced by the common capacitance pattern 7 connected to the pattern and the common electrode line in order to suppress the influence of the penetration voltage when the TFT is off. 6 is less than or equal to one-tenth of the storage capacity formed. FIGS. 2 and 3 show an example of a case where there is a defect in this pixel. Specifically, FIG.
Indicates a change in pattern shape for making the defective pixel inconspicuous when a pattern abnormality A occurs between the drain electrode 4 of the thin film transistor 3 and the video signal wiring 2.

When a pattern abnormality A occurs, the pixel electrode 5 and the video signal wiring 2 are electrically short-circuited, and this pixel becomes a bright spot. Therefore, in the present invention, the first pattern wiring 11 connecting the pixel electrode 5 and the drain electrode 4 is cut at the portion B by irradiating a laser beam or the like, and the portion of the overlapping pattern 9 connected to the common capacitance pattern 7 is scanned with the scanning signal. By electrically connecting the common capacitance pattern 7, that is, the pixel electrode 5 to the scanning signal line 1 by breaking the interlayer insulation with the line 1, the pixel electrode 5 is connected to the scanning signal line having a sufficiently lower potential than the normal pixel potential. As a result, the pixel becomes a black point, and it is difficult to recognize the defect as a defect on the image display, and it is possible to improve the display quality and the yield.

FIG. 3 shows that the pattern abnormality is the common capacitance pattern 7.
Shows the case where this occurred. In this case, the second pattern wiring 12 is cut at the portion C, the interlayer insulation between the drain electrode 4 of the thin film transistor 3 and the scanning signal wiring 1 is broken, and the drain electrode 4, that is, the pixel electrode 5 is electrically disconnected. Are connected to the scanning signal wiring 1. As a result, the pixel becomes a black point, and it is difficult to recognize the defect as a defect on the image display, and it is possible to improve the display quality and the yield.

The same effect can be obtained by the same treatment not only for the pattern abnormality but also for various pixel defects such as interlayer insulation.

[0017]

As described above, according to the present invention, defects caused by pattern abnormalities and destruction of interlayer insulation during the manufacturing process of the liquid crystal display panel are connected to the common capacitor pattern and the pixel electrode, the drain electrode and the pixel electrode of the thin film transistor. By independently forming the pattern wirings to be formed, the pixel display is set to a black point, and it is difficult to recognize the defect as an image display defect, so that the display quality can be improved and the yield can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of one pixel of a liquid crystal display panel according to Embodiment 1 of the present invention.

FIG. 2 is an exemplary plan view showing an example of relief in the case where there is a pattern defect in the embodiment;

FIG. 3 is a plan view showing an example of remedy when another pattern defect is present in the embodiment.

FIG. 4 is a plan view of one pixel of a conventional liquid crystal display panel.

[Explanation of symbols]

Reference Signs List 1 scanning signal wiring 2 video signal wiring 3 thin film transistor 4 drain electrode 5 pixel electrode 6 common electrode wiring 7 common capacitance pattern 8 contact 9 overlapping pattern connected to common capacitance pattern 7 11 first pattern wiring 12 second pattern wiring A drain Abnormal pattern between electrode 4 and video signal wiring 2 B Cut part of pattern wiring connecting pixel electrode 5 and drain electrode 4 C Cut part of pattern wiring connecting pixel electrode 5 and common capacitance pattern 7

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Atsushi Mitsuo, Inventor 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. Terms (reference) 2H092 JA24 JB56 JB69 JB73 KB25 MA52 NA29 5C094 AA02 AA42 AA48 BA03 BA43 CA19 DA13 DB04 DB10 EA04 EA10 FA01 FB12 FB14 FB15 GB10 5F110 AA02 AA27 HM18 NN73 QQ30

Claims (6)

[Claims] A liquid crystal is sealed between a pair of glass substrates, a counter electrode substrate is provided on one of the glass substrates, and a plurality of scanning signal wirings and a plurality of scanning signal wirings intersecting the scanning signal wirings are provided on the other of the glass substrates. Video signal wiring, a common electrode wiring wired in parallel with the plurality of scanning signal wirings, a thin film transistor provided at a portion where the plurality of scanning signal wirings and the plurality of video signal wirings intersect, and a drain of the thin film transistor In a liquid crystal display panel in which each pixel is formed including a pixel electrode connected to an electrode via a contact, and a common capacitance pattern connected to the pixel electrode and forming a capacitance with a common electrode wiring, the common capacitance pattern includes the drain The pixel electrode of the same pixel is connected to the pixel electrode via a second pattern wiring different from the first pattern wiring connecting the electrode and the pixel electrode. A liquid crystal display panel provided with an overlapping pattern that partially overlaps with a scanning signal wiring forming a gate electrode of a thin film transistor connected to a pole via an interlayer insulating film. 2. The liquid crystal display panel according to claim 1, wherein the overlapping pattern protrudes from the common capacitance pattern toward the scanning signal wiring in a plane and crosses the scanning signal wiring. 3. The liquid crystal display according to claim 1, wherein a capacitance between the scanning signal wiring of the overlapping pattern and a parasitic capacitance formed between the thin film transistor connected to the pattern and the gate wiring is equal to or smaller than the capacitance. panel. 4. A storage capacitor formed between a common capacitance pattern and a common electrode wiring connected to this pattern, wherein the capacitance between the scanning signal wiring and the overlapping pattern is not more than one-tenth of the storage capacitance. 3. The liquid crystal display panel according to claim 1 or 2. 5. The liquid crystal display panel according to claim 1, wherein the first pattern wiring of the defective pixel in the liquid crystal display panel is cut, and a scanning signal wiring and an interlayer insulating film are interposed on the scanning signal wiring. A method of manufacturing a liquid crystal display panel in which the overlapping pattern partially overlapped is electrically connected by breaking the interlayer insulating film to make the display of the defective pixel black dots and difficult to recognize. 6. The liquid crystal display panel according to claim 1, wherein the second pattern wiring of the defective pixel in the liquid crystal display panel is cut, and a scanning signal wiring and an interlayer insulating film are interposed on the scanning signal wiring. A method of manufacturing a liquid crystal display panel in which the overlapped pattern partially overlaps and electrically connects the destructed interlayer insulating film to blacken the defective pixels to make them difficult to recognize.