JP4571727B2 - LCD panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display panel that performs alignment division control of vertically aligned liquid crystal (hereinafter referred to as vertical alignment liquid crystal) by an MVA (Multi-domain Vertical Alignment) method.
[0002]
[Prior art]
A liquid crystal display panel using the MVA method will be briefly described. The MVA type liquid crystal display panel has a slit-like electrode on which an electrode material is not formed in a projection provided on an electrode as a member for locally distorting an electric field applied to the liquid crystal to regulate alignment of the liquid crystal. It has one of the blank areas. Here, a liquid crystal display panel in which a slit electrode extraction region is provided in a pixel electrode as an alignment regulating member will be described with reference to FIG.
[0003]
FIG. 7 shows a schematic configuration of a thin film transistor substrate of a conventional liquid crystal display panel as viewed toward the panel surface. The liquid crystal display panel includes a thin film transistor substrate, a counter substrate, and vertically aligned liquid crystal sandwiched between these substrates.
[0004]
In FIG. 7, the thin film transistor substrate includes a thin film transistor 3 and a transparent electrode material (for example, ITO; indium) for each pixel region defined by a gate bus line 1 extending in the horizontal direction and a data bus line 2 extending in the vertical direction. A pixel electrode 4 made of tin oxide is formed.
[0005]
The pixel electrodes 4 are widely distributed in the pixel region, and slit-shaped electrode extraction regions (hereinafter abbreviated as “slits”) 5 are arranged obliquely with respect to the gate bus lines 1 and the data bus lines 2. By arranging, it is divided into a plurality of divided electrode regions a, b, c, d, e. The plurality of divided electrode regions a, b, c, d, and e are maintained in a conductive state between each other by a thin connection electrode 6 formed between the slits 5. The contact hole 7 is provided in the divided electrode region a closest to the thin film transistor 3.
[0006]
The thin film transistor 3 is formed in the vicinity of the intersection of the gate bus line 1 and the data bus line 2. The thin film transistor 3 has a gate electrode connected to the gate bus line 1, a drain electrode connected to the data bus line 2, and a source electrode connected to the divided electrode region a through the contact hole 7.
[0007]
Although not shown, a counter electrode is formed on the counter substrate that faces the thin film transistor substrate with a predetermined gap. A vertical alignment film (not shown) is formed on the pixel electrode 4 and the counter electrode, and a liquid crystal having negative dielectric anisotropy is sealed between the two vertical alignment films. A plurality of linear protrusions made of a dielectric are formed between the counter electrode on the counter substrate and the vertical alignment film. The linear protrusions are periodically formed according to the slit pattern on the pixel electrode 4. The slits 5 and the linear protrusions facing each other between the two substrates are shifted by a half pitch when viewed from the substrate surface. The slits 5 and the linear protrusions are used for alignment control that divides the liquid crystal in the pixel region into a plurality of alignment directions.
[0008]
Two polarizing plates whose polarization axes are orthogonal to each other are provided on the outer surfaces of the two substrates. The mounting direction of the polarizing plate is adjusted so that the orientation of the major axis of the liquid crystal molecules tilted on the substrate display surface when a voltage is applied is approximately 45 ° with respect to the polarizing axis of the polarizing plate when viewed from the substrate surface. .
[0009]
When nematic liquid crystal having negative dielectric anisotropy is sealed between the substrates, the major axis of the liquid crystal molecules is aligned in the direction perpendicular to the film surface of the vertical alignment film. For this reason, the liquid crystal molecules on the substrate surface are aligned perpendicular to the substrate surface, and the liquid crystal molecules on the inclined surfaces of the linear protrusions are inclined with respect to the substrate surface.
[0010]
When light is incident from one substrate surface without applying a voltage between both electrodes of the MVA-LCD having the above structure, linearly polarized light that has passed through one polarizing plate and is incident on the liquid crystal layer is vertically aligned. It proceeds along the long axis direction of the liquid crystal molecules. Since birefringence does not occur in the major axis direction of the liquid crystal molecules, incident light travels without changing the polarization direction, and is absorbed by the other polarizing plate having a polarization axis perpendicular to one polarizing plate. This provides a dark display when no voltage is applied.
[0011]
When a voltage is applied between the counter electrodes, the liquid crystal molecules on the substrate surface follow the orientation direction of the liquid crystal molecules tilted in advance by the linear protrusions and the orientation direction of the liquid crystal molecules tilted by the oblique electric field generated in the vicinity of the slit 5. The major axis of the liquid crystal molecules is aligned parallel to the substrate surface while the alignment direction of the molecules is regulated.
[0012]
Liquid crystal molecules exhibit birefringence with respect to linearly polarized light incident on the liquid crystal layer in this state, and the polarization state of incident light changes according to the tilt of the liquid crystal molecules. The light passing through the liquid crystal layer when a predetermined maximum voltage is applied becomes linearly polarized light whose polarization direction is rotated by 90 °, and therefore the light is transmitted through the other polarizing plate to obtain a bright display. When the voltage is not applied again, the display can be returned to the dark state by the orientation regulating force. Further, gradation display can be performed by changing the applied light to control the inclination of the liquid crystal molecules to change the transmitted light intensity from the other polarizing plate.
[0013]
According to the active matrix type MVA type TFT-LCD in which a TFT is formed in each pixel, the orientation direction of the liquid crystal in the pixel can be divided into a plurality of parts. Therefore, an extremely wide viewing angle and a high contrast compared to the TN type TFT-LCD. Can be realized. Further, since the rubbing process is unnecessary, the manufacturing process is facilitated and the manufacturing yield can be improved.
[0014]
[Problems to be solved by the invention]
Incidentally, in recent years, the demand for liquid crystal display panels has increased and has been widely used as display devices for personal computers and portable terminals. Under such circumstances, there is an increasing demand for a low price, high definition and large screen from the market. Therefore, in order to meet the demand for high definition and large screen, the number of fine patterns increases.
[0015]
As a result, in the patterning process of the pixel electrode 4, for example, as shown in FIG. 8, a pattern defect may occur due to dust mixing during the formation of the pixel electrode pattern, which causes a high cost due to a decrease in yield. .
[0016]
FIG. 8 shows a schematic configuration of the thin film transistor substrate viewed from the front of the panel, as in FIG. 7, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0017]
In FIG. 8, the shaded region G on the upper layer of the thin film transistor 3b is connected to the divided electrode region b of the pixel electrode 4a and the divided electrode region a of the pixel electrode 4b on the upper layer of the thin film transistor 3b by ITO when the pixel electrode 4 is patterned. It shows the area that has been.
[0018]
In this case, since the two pixel electrodes 4a and 4b are conductive, a display defect occurs when different data is written. Such a defect in which adjacent pixel electrodes are short-circuited is referred to as a connection failure. Conventionally, however, the connection failure cannot be repaired and the pixel cannot be relieved, resulting in a decrease in manufacturing yield.
[0019]
An object of the present invention is to provide a liquid crystal display panel that can relieve a pixel having a poor connection and improve a manufacturing yield.
[0020]
[Means for Solving the Problems]
The object is to provide a thin film transistor formed for each pixel region and connected to a predetermined bus line, and a pixel electrode provided in the pixel region and divided into at least three or more divided electrode regions by a slit-like electrode extraction region. A thin film transistor substrate having a connection electrode for electrically connecting adjacent divided electrode regions, and a connection portion for electrically connecting the thin film transistor and the pixel electrode, and disposed opposite to the thin film transistor substrate. In the liquid crystal display panel in which the liquid crystal is sealed between the counter substrate, the connection portion is provided in at least two or more of the divided electrode regions and the divided electrode region connectable via the connecting electrodes. This is achieved by the featured liquid crystal display panel.
[0021]
According to the present invention, even if a connection failure with an adjacent pixel occurs, among the plurality of divided electrode regions, the connection electrodes around the divided electrode region related to the connection failure are made non-conductive by irradiation with laser light, etc. Most of the divided electrode regions can be relieved.
[0022]
In the liquid crystal display panel of the present invention, the connection portion is provided in the divided electrode region closest to the bus line or the thin film transistor. When there are a plurality of divided electrode regions that can be connected to at least two or more of the divided electrode regions via the connection electrodes, a connection portion is provided in the divided electrode region closest to the bus line or the thin film transistor. By doing so, the wiring pattern can be shortened, and the aperture ratio does not need to be reduced.
[0023]
In the liquid crystal display panel of the present invention, the connection electrode is formed of the same electrode material as that of the divided electrode region. According to the present invention, the connection electrode can be formed at the same time as the patterning of the divided electrode region, and the manufacturing process can be prevented from increasing.
[0024]
Furthermore, in the liquid crystal display panel of the present invention, the electrode extraction region is an alignment regulating member that controls the alignment of the liquid crystal by causing distortion in the electric field applied to the liquid crystal. According to the present invention, since the alignment of the vertically aligned liquid crystal can be performed in the remaining divided electrode region obtained by separating the defective divided electrode region, a wide-field display operation can be performed in the same manner as other normal pixel electrodes. Become.
[0025]
Furthermore, in the liquid crystal display panel of the present invention, the electrode extraction region is formed obliquely with respect to the bus line, or formed in parallel with the bus line. ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of design in adjustment of the polarizing axis of a polarizing plate affixed on both board | substrate outer surfaces, adjustment of a viewing angle characteristic, etc. can be raised now.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
A liquid crystal display panel according to a first embodiment of the present invention will be described with reference to FIG. In the following description, components having the same functions and functions as those described with reference to FIGS. 7 and 8 are denoted by the same reference numerals, and description thereof is omitted. FIG. 1 shows a schematic configuration of a liquid crystal display panel as viewed toward the panel surface, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0027]
The formation direction of the slits 5 a, 5 b, 5 c formed in the two pixel electrodes 4 a, 4 b in the present embodiment is oblique with respect to the gate bus line 1 and the data bus line 2. This formation direction is opposite to the formation direction of the slits 5 formed in the conventional thin film transistor substrate described with reference to FIGS. 7 and 8 with respect to the direction in which the data bus lines extend. In FIG. 1, four divided electrode regions a, b, c, and d are shown.
[0028]
Contact holes 7a and 7b that constitute connection portions that electrically connect the source electrodes of the thin film transistors 3a and 3b and the pixel electrodes 4a and 4b are provided in the divided electrode regions b of the pixel electrodes 4a and 4b. The contact hole 7b provided in the divided electrode region b of the pixel electrode 4b in the hatched region A is not shown. Thus, the connection part in this Embodiment is provided in the division | segmentation electrode area | region b connected via the two division | segmentation electrode area | regions a and c and connection electrode 6a, 6b.
[0029]
The reason why the divided electrode region b is selected as the region where the contact holes 7a and 7b constituting the connecting portion are provided is, firstly, the divided electrode region b is disposed closest to the thin film transistors 3a and 3b and the data bus line 2. Because. By selecting the divided electrode region b, the thin film transistor 3 can be formed in the vicinity of the data bus line, and the distance from the source electrode of the thin film transistor 3 to the contact hole 7 can be shortened. Secondly, even if a poor connection with an adjacent pixel occurs, among the plurality of divided electrode regions a, b, c, d, for example, as shown in FIG. This is because if the connection electrode 6a around a is made non-conductive by laser light irradiation or the like, most of the remaining divided electrode regions b, c, d of the pixel region 4a can be relieved.
[0030]
In FIG. 1, the hatched area A in the upper layer of the thin film transistor 3b is due to a pixel electrode pattern defect in which the divided electrode area a of the pixel electrode 4a and the divided electrode area b of the pixel electrode 4b are electrically connected in the vicinity of the thin film transistor 3b. An area where poor connection occurs is shown.
[0031]
In this case, in the present embodiment, the connection electrode 6a on the slit 5a that defines the divided electrode region a on the pixel electrode 4a side is cut by irradiating a laser beam or the like to make the divided electrode regions a and b non-conductive. By electrically separating the divided electrode region a from the thin film transistor 3a, the electrical connection between the pixel electrodes 4a and 4b can be cut off. The thin film transistors 3a and 3b can operate independently without being influenced by each other.
[0032]
At this time, in the pixel electrode 4a, the divided electrode regions b, c, and d are connected to the thin film transistor 3a. In the pixel electrode 4b, the divided electrode region a on the pixel electrode 4a side is newly connected to the pixel transistor 3b.
[0033]
In the pixel electrode 4a, the alignment is divided by regulating the alignment of the vertically aligned liquid crystal in a predetermined direction by an oblique electric field generated between the slit 5b between the divided electrode regions b and c which are in a conductive state and the counter electrode (not shown). Done. Similarly, alignment is performed by regulating the alignment of the vertically aligned liquid crystal in a predetermined direction by an oblique electric field generated between the slit 5c between the divided electrode regions c and d and a counter electrode (not shown). That is, in the pixel electrode 4a, the divided electrode regions b, c, and d that are in a conductive state with each other can perform a display operation with a wide viewing angle almost the same as the pixel electrodes of other normal pixels.
[0034]
In the pixel electrode 4b, the same alignment division is performed in the slits 5 between the divided electrode regions a, b, c, and d except for the newly added divided electrode region a on the pixel electrode 4a side.
[0035]
In this way, for the pixel electrode pattern defect indicated by the hatched area A in FIG. 1, the divided electrode area a on the pixel electrode 4a side is cut off to repair the connection defect, and the remaining divided electrode areas b, c, d are repaired. Since the pixel electrodes 4a and 4b can be relieved at the same time, the yield can be improved.
[0036]
Next, a liquid crystal display panel according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 shows a schematic configuration of the liquid crystal display panel as viewed toward the panel surface, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0037]
The slits 5 a and 5 b formed in the two pixel electrodes 4 a and 4 b in the present embodiment are formed in parallel with the data bus line 2. FIG. 2 shows three divided electrode regions a, b, and c arranged in the horizontal direction in the drawing.
[0038]
Contact holes 7a and 7b that constitute connection portions that electrically connect the source electrodes of the thin film transistors 3a and 3b and the pixel electrodes 4a and 4b are provided in the divided electrode regions b of the pixel electrodes 4a and 4b. Thus, the connection part in this Embodiment is provided in the division | segmentation electrode area | region b connected via the two division | segmentation electrode area | regions a and c and connection electrode 6a, 6b.
[0039]
The segmented electrode region b is selected as the region where the contact holes 7a and 7b constituting the connecting portion are provided even if a poor connection with an adjacent pixel occurs, among the segmented electrode regions a, b, and c, for example, As shown in FIG. 2, if the connection electrode 6b around the divided electrode region c of the pixel region 4a involved in the poor connection is made non-conductive by laser light irradiation or the like, the remaining divided electrode regions a and b of the pixel region 4a. This is because it can be rescued. Similarly, if the connection electrode 6a around the divided electrode region a of the pixel region 4b involved in the poor connection is made non-conductive by laser light irradiation or the like, the remaining divided electrode regions b and c of the pixel region 4a are relieved. Because you can.
[0040]
In FIG. 2, a hatched region B indicates a region where a pixel electrode pattern defect is caused by electrically connecting the divided electrode region c of the pixel electrode 4a and the divided electrode region a of the pixel electrode 4b. In this example, the present embodiment can employ two repair methods.
[0041]
In the first repair method, in the pixel electrode 4a, the connection electrode 6b on the slit 5b that defines the divided electrode region c is cut by irradiating a laser beam to make the divided electrode regions b and c non-conductive. The region c is electrically isolated from the thin film transistor 3a. By doing so, the electrical connection between the pixel electrodes 4a and 4b can be cut off.
[0042]
In the second repair method, in the pixel electrode 4b, the connection electrode 6a on the slit 5a that defines the divided electrode region a is cut by irradiating the laser beam, and the divided electrode regions a and b are made non-conductive. The region a is electrically isolated from the thin film transistor 3b. By doing so, the electrical connection between the pixel electrodes 4a and 4b can be cut off.
[0043]
Since the electrical connection between the pixel electrodes 4a and 4b can be cut off by any of the above methods, the thin film transistors 3a and 3b can operate independently without being affected by each other, and both pixel electrodes can be relieved together. .
[0044]
In the case of the first repair method, in the pixel electrode 4a, the vertically aligned liquid crystal is generated by an oblique electric field generated between the slit 5a between the divided electrode regions a and b that are in a conductive state and the counter electrode (not shown). Orientation division is performed while regulating the orientation in a predetermined direction.
That is, in the pixel electrode 4a, the display operation with a wide viewing angle almost the same as the pixel electrodes of other normal pixels can be performed by the divided electrode regions a and b which are in a conductive state. In the pixel electrode 4b, the same alignment division is performed in the slits 5 between the divided electrode regions a, b, and c excluding the newly added divided electrode region c on the pixel electrode 4a side.
[0045]
Further, in the case of the second method, in the pixel electrode 4b, the vertically aligned liquid crystal is generated by an oblique electric field generated between the slit 5b between the divided electrode regions b and c that are in a conductive state and the counter electrode (not shown). Is divided in a predetermined direction. In other words, in the pixel electrode 4b, the divided electrode regions b and c that are in a conductive state can perform a display operation with a wide viewing angle almost the same as the pixel electrodes of other normal pixels. Further, in the pixel electrode 4a, the same alignment division is performed in the slits 5 between the respective divided electrode regions a, b, c excluding the newly added divided electrode region a on the pixel electrode 4b side.
[0046]
In this way, the pixel electrode pattern defect indicated by the hatched region B in FIG. 2 is cut off from the divided electrode region c on the pixel electrode 4a side to repair the defective connection and repair the remaining divided electrode regions a and b, or By separating the divided electrode region a of the pixel electrode 4b and relieving the remaining divided electrode regions b and c, the pixel electrodes 4a and 4b can be relieved simultaneously. As a result, the yield can be improved.
[0047]
Next, a liquid crystal display panel according to a third embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a schematic configuration of the liquid crystal display panel as viewed toward the panel surface, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0048]
The slits 5 a, 5 b, 5 c, 5 d, 5 e formed in the two pixel electrodes 4 a, 4 b in the present embodiment are formed in parallel with the gate bus line 1. FIG. 3 shows six divided electrode regions a, b, c, d, e, and f arranged in the vertical direction in the drawing.
[0049]
Contact holes 7a and 7b constituting connection portions for electrically connecting the source electrodes of the thin film transistors 3a and 3b and the pixel electrodes 4a and 4b are provided in the divided electrode regions c of the pixel electrodes 4a and 4b. Thus, the connection part in this Embodiment is provided in the division | segmentation electrode area | region c connected via the two division | segmentation electrode area | regions b and d and connection electrode 6b, 6c.
[0050]
The segmented electrode region c is selected as a region where the contact holes 7a and 7b constituting the connection portion are provided even if a poor connection with an adjacent pixel occurs, a plurality of segmented electrode regions a, b, c, d, e , F, for example, as shown in FIG. 3, if the connection electrode 6a around the divided electrode region a of the pixel region 4a involved in poor connection is made non-conductive by laser light irradiation or the like, the remaining pixel region 4a This is because the divided electrode regions b to f can be relieved. Similarly, if the connection electrode 6a around the divided electrode region a of the pixel region 4b involved in the poor connection is made non-conductive by laser light irradiation or the like, the remaining divided electrode regions b to f of the pixel region 4a are relieved. Can do. Furthermore, in the present embodiment, even if a connection failure occurs in the divided electrode region b, the remaining divided regions cf can be relieved.
[0051]
In FIG. 3, a hatched region C indicates a region where a pixel electrode pattern defect has occurred in which the divided electrode regions a of the pixel electrodes 4a and 4b are electrically connected to each other.
In this example, the present embodiment can employ two repair methods.
[0052]
In the first repair method, in the pixel electrode 4a, the connection electrode 6a on the slit 5a that defines the divided electrode region a is cut by irradiating the laser beam, and the divided electrode regions a and b are made non-conductive. The region a is electrically isolated from the thin film transistor 3a. By doing so, the electrical connection between the pixel electrodes 4a and 4b can be cut off.
[0053]
In the second repair method, in the pixel electrode 4b, the connection electrode 6a on the slit 5a that defines the divided electrode region a is cut by irradiating the laser beam, and the divided electrode regions a and b are made non-conductive. The region a is electrically isolated from the thin film transistor 3b. By doing so, the electrical connection between the pixel electrodes 4a and 4b can be cut off.
[0054]
Since the electrical connection between the pixel electrodes 4a and 4b can be cut off by any of the above methods, the thin film transistors 3a and 3b can operate independently without being affected by each other, and both the pixel electrodes 4a and 4b can be relieved together. It becomes like this. Similarly to the second embodiment, this embodiment can perform a display operation with a wide viewing angle almost the same as the pixel electrodes of other normal pixels using the rescued divided electrode regions. .
[0055]
As described above, the pixel electrode 4a is repaired by cutting off the divided electrode region a in the pixel electrode 4a or the pixel electrode 4b and relieving the remaining divided electrode regions b to f with respect to the pixel electrode pattern defect indicated by the hatched region C in FIG. 4b can be relieved at the same time. As a result, the yield can be improved.
[0056]
Next, a liquid crystal display panel according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 4 shows a schematic configuration of the liquid crystal display panel as viewed toward the panel surface, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0057]
The slits 5a, 5b, and 5c formed in the two pixel electrodes 4a and 4b in the present embodiment are formed obliquely with respect to the gate bus line 1 and the data bus line 2. This forming direction is the same as the forming direction of the slit 5 formed in the conventional thin film transistor substrate described with reference to FIGS. The display of the divided electrode region a of the pixel electrode 4b appearing in the hatched region D is omitted.
[0058]
The thin film transistors 3a and 3b according to the present embodiment are formed in the vicinity of the data bus line 2 on the right side in the drawing. Contact holes 7a and 7b constituting connection portions for electrically connecting the source electrodes of the thin film transistors 3a and 3b and the pixel electrodes 4a and 4b are provided in the divided electrode regions c of the pixel electrodes 4a and 4b. Thus, the connection part in this Embodiment is provided in the division | segmentation electrode area | region c connected via the two division | segmentation electrode area | regions b and d and connection electrode 6b, 6c. By forming the thin film transistors 3a and 3b in the vicinity of the right adjacent data bus line 2 in the figure, the length of the source electrodes of the thin film transistors 3a and 3b connected to the contact holes 7a and 7b in the respective divided electrode regions c is minimized. Yes.
[0059]
The segmented electrode region c is selected as a region where the contact holes 7a and 7b constituting the connection portion are provided even if a poor connection with an adjacent pixel occurs, among the segmented electrode regions a, b, c, and d. For example, as shown in FIG. 4, if the connection electrodes 6b around the divided electrode regions b of the pixel regions 4a and 4b involved in poor connection are made non-conductive by laser light irradiation or the like, the remaining pixel regions 4a and 4b This is because the divided electrode regions c and d can be relieved.
[0060]
In FIG. 4, the hatched region D is electrically connected to the divided electrode region a of the pixel electrode 4a and the divided electrode regions a and b of the pixel electrode 4b in the vicinity where the gate bus line 1 and the data bus line 2 intersect. A region in which a relatively wide range of connected pixel electrode patterns has occurred is shown.
[0061]
In this case, in the present embodiment, the connection electrode 6b on the slit 5b between the divided electrode regions b and c on the pixel electrode 4b side is cut by irradiating laser light or the like, and the divided electrode regions b and c are not electrically connected. Then, the electrical connection between the pixel electrodes 4a and 4b can be cut off by electrically separating the divided electrode regions a and b from the thin film transistor 3b.
The thin film transistors 3a and 3b can operate independently without being influenced by each other.
[0062]
At this time, in the pixel electrode 4b, the pixel division electrode regions c and d are connected to the thin film transistor 3b. In the pixel electrode 4a, the divided electrode region a on the side of the pixel electrode 4b below the hatched region D is newly connected to the pixel transistor 3a. In such a state, desired alignment division control is performed on the pixel electrode 4a side, and similarly, normal division alignment control is performed on the divided electrode regions c and d on the pixel electrode 4b side.
[0063]
In this way, for the pixel electrode pattern defect indicated by the hatched area D in FIG. 4, the divided electrode areas a and b on the pixel electrode 4b side are separated to repair the connection defect, and the remaining divided electrode areas c and d are relieved. Thus, the pixel electrodes 4a and 4b can be relieved at the same time, so that the yield can be improved.
[0064]
Next, a liquid crystal display panel according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a schematic configuration of the liquid crystal display panel as viewed toward the panel surface, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0065]
The slits 5a, 5b, 5c, and 5d formed in the two pixel electrodes 4a and 4b in the present embodiment are formed obliquely with respect to the gate bus line 1 and the data bus line 2 as in the fourth embodiment. Has been. However, the slit formation pattern is different from the pattern shown in FIG.
[0066]
The thin film transistors 3a and 3b according to the present embodiment are formed in the vicinity of the data bus line 2 on the right side in the drawing. Contact holes 7a and 7b that constitute connection portions that electrically connect the source electrodes of the thin film transistors 3a and 3b and the pixel electrodes 4a and 4b are provided in the divided electrode regions b of the pixel electrodes 4a and 4b. Thus, the connection part in this Embodiment is provided in the division | segmentation electrode area | region b connected via the two division | segmentation electrode area | regions a and c and connection electrode 6a, 6b. By forming the thin film transistors 3a and 3b in the vicinity of the right data bus line 2 in the drawing, the length of the source electrodes of the thin film transistors 3a and 3b connected to the contact holes 7a and 7b in the respective divided electrode regions b is minimized. Yes.
[0067]
The reason why the divided electrode region b is selected as a region where the contact holes 7a and 7b constituting the connection portion are provided is the same as in the fourth embodiment. That is, even if a connection failure with an adjacent pixel occurs, if contact holes 7a and 7b connected to the source electrode are provided in the divided electrode region b, among the divided electrode regions a, b, c, and d, for example, As shown in FIG. 5, if the connection electrode 6a around the divided electrode region a of the pixel region 4b involved in poor connection is made non-conductive by laser light irradiation or the like, all of the pixel region 4a and the rest of the pixel region 4b are obtained. Most of the divided electrode regions b, c, d can be relieved.
[0068]
In FIG. 5, the hatched region E is electrically connected to the divided electrode region b of the pixel electrode 4a and the divided electrode region a of the pixel electrode 4b in the vicinity where the gate bus line 1 and the data bus line 2 intersect. A region where a defective pixel electrode pattern occurs is shown.
In the present embodiment, the connection electrode 6a on the slit 5a between the divided electrode regions a and b on the pixel electrode 4b side is cut by irradiating a laser beam or the like, and the divided electrode regions a and b are made non-conductive, and divided. By electrically separating the electrode region a from the thin film transistor 3b, the electrical connection between the pixel electrodes 4a and 4b can be cut off. The thin film transistors 3a and 3b can operate independently without being influenced by each other.
[0069]
At this time, in the pixel electrode 4b, the pixel division electrode regions b, c, and d are connected to the thin film transistor 3b. In the pixel electrode 4a, the divided electrode region a on the pixel electrode 4b side is newly connected to the pixel transistor 3a. In such a state, desired alignment division control is performed on the pixel electrode 4a side, and similarly, normal division alignment control is performed on the divided electrode regions b, c, and d on the pixel electrode 4b side.
[0070]
In this way, for the pixel electrode pattern defect indicated by the hatched area E in FIG. 5, the divided electrode region a on the pixel electrode 4b side is cut off to repair the defective connection, and the remaining divided electrode regions b, c, d are relieved. Thus, the pixel electrodes 4a and 4b can be relieved at the same time, so that the yield can be improved.
[0071]
Next, a liquid crystal display panel according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a schematic configuration of the liquid crystal display panel as viewed toward the panel surface, and shows two pixel regions arranged in the horizontal direction. In each pixel region, thin film transistors 3a and 3b and pixel electrodes 4a and 4b in which slits 5 are formed are formed.
[0072]
The pattern shapes of the slits 5a, 5b, and 5c formed in the two pixel electrodes 4a and 4b in the present embodiment are the same as those in the fourth embodiment. The thin film transistors 3a and 3b according to the present embodiment are formed near the right data bus line 2 in the drawing. Contact holes 7a and 7b that constitute connection portions that electrically connect the source electrodes of the thin film transistors 3a and 3b and the pixel electrodes 4a and 4b are provided in the divided electrode regions b of the pixel electrodes 4a and 4b. Thus, the connection part in this Embodiment is provided in the division | segmentation electrode area | region b connected via the two division | segmentation electrode area | regions a and c and connection electrode 6a, 6b. By forming the thin film transistors 3a and 3b in the vicinity of the data bus line 2 on the right in the figure, the length of the source electrodes of the thin film transistors 3a and 3b connected to the contact holes 7a and 7b in the respective divided electrode regions b is minimized. ing.
[0073]
The reason why the divided electrode region b is selected as a region where the contact holes 7a and 7b constituting the connection portion are provided is the same as in the fourth embodiment. In this case, even if poor connection with adjacent pixels occurs, among the plurality of divided electrode regions a, b, c, d, for example, as shown in FIG. 6, the divided electrode region a of the pixel region 4b involved in poor connection. If the connection electrode 6a around the pixel region is made non-conductive by laser light irradiation or the like, all of the pixel region 4a and most of the remaining divided electrode regions b, c, and d of the pixel region 4b can be relieved.
[0074]
In FIG. 6, the hatched region F is such that the divided electrode region b of the pixel electrode 4a and the divided electrode region a of the pixel electrode 4b are electrically connected in the vicinity where the gate bus line 1 and the data bus line 2 intersect. A region where a defective pixel electrode pattern occurs is shown.
In the present embodiment, the connection electrode 6a on the slit 5a that defines the divided electrode region a on the pixel electrode 4b side is cut by irradiating a laser beam or the like, and the divided electrode regions a and b are made non-conductive. By electrically separating the region a from the thin film transistor 3b, the electrical connection between the pixel electrodes 4a and 4b is cut off. The thin film transistors 3a and 3b can operate independently without being influenced by each other.
[0075]
At this time, in the pixel electrode 4b, the pixel division electrode regions b, c, and d are connected to the thin film transistor 3b. In the pixel electrode 4a, the divided electrode region a on the pixel electrode 4b side is newly connected to the pixel transistor 3a. In such a state, desired alignment division control is performed on the pixel electrode 4a side, and similarly, normal division alignment control is performed on the divided electrode regions b, c, and d on the pixel electrode 4b side.
[0076]
In this way, for the pixel electrode pattern defect indicated by the hatched area F in FIG. 6, the divided electrode area a on the pixel electrode 4b side is cut off to repair the connection defect, and the remaining divided electrode areas b, c, d are relieved. Thus, the pixel electrodes 4a and 4b can be relieved at the same time, so that the yield can be improved.
[0077]
The present invention is not limited to the above embodiment, and various modifications can be made.
For example, the connection electrode 6 on the slit 5 according to the above embodiment is formed of the same material in the same process as the pixel electrode 4 when the pixel electrode 4 is formed by patterning using a photolithography process. The present invention is not limited to this, and the connection electrode 6 may be formed of a different material using a process different from the process of forming the pixel electrode 4.
[0078]
【The invention's effect】
As described above, according to the present invention, it is possible to relieve a pixel in which a connection failure has occurred and improve the manufacturing yield.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a liquid crystal display panel according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a schematic configuration of a liquid crystal display panel according to a second embodiment of the present invention.
FIG. 3 is a diagram showing a schematic configuration of a liquid crystal display panel according to a third embodiment of the present invention.
FIG. 4 is a diagram showing a schematic configuration of a liquid crystal display panel according to a fourth embodiment of the present invention.
FIG. 5 is a diagram showing a schematic configuration of a liquid crystal display panel according to a fifth embodiment of the present invention.
FIG. 6 is a diagram showing a schematic configuration of a liquid crystal display panel according to a sixth embodiment of the present invention.
FIG. 7 is a diagram showing a schematic configuration of a conventional liquid crystal display panel.
FIG. 8 is a diagram illustrating a state in which a pattern defect has occurred in a pixel electrode in a conventional liquid crystal display panel.
[Explanation of symbols]
1 Gate bus line
2 Data bus line
3a, 3b thin film transistor
4a, 4b Pixel electrode
5a, 5b, 5c, 5d, 5e Slit
6a, 6b, 6c, 6d, 6e Connection electrode
7a, 7b Contact hole
a, b, c, d, e, f Split electrode region
A, B, C, D, E, F, G

Claims (4)

A thin film transistor formed for each pixel region and connected to a predetermined bus line is adjacent to a pixel electrode provided in the pixel region and divided into at least three or more divided electrode regions by a slit-shaped electrode extraction region. A thin film transistor substrate having a connection electrode that electrically connects the divided electrode regions; and a connection portion that electrically connects the thin film transistor and the pixel electrode; and a counter substrate disposed opposite to the thin film transistor substrate. In the liquid crystal display panel with the liquid crystal sealed between,
The liquid crystal display panel, wherein the connection portion is provided in at least two divided electrode regions that are arranged on both sides and are not adjacent to each other and can be connected via the connection electrodes. The liquid crystal panel according to claim 1,
The liquid crystal display panel, wherein the connection portion is provided in the divided electrode region closest to the bus line or the thin film transistor. The liquid crystal display panel according to claim 1 or 2,
The liquid crystal display panel, wherein the connection electrode is formed of the same electrode material as the divided electrode region. The liquid crystal display panel according to any one of claims 1 to 3,
The liquid crystal display panel, wherein the electrode extraction region is an alignment regulating member that controls the alignment of the liquid crystal by causing distortion in an electric field applied to the liquid crystal.

Images