KR20070110966A - Liquid crystal display - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to repair generated pixel faults easily without reducing an aperture ratio of pixels as reducing the number of data driving circuit chips. An LCD(Liquid Crystal Display) comprises a substrate, plural gate lines(121), plural data lines(171), plural TFTs(Thin Film Transistors), plural pixel electrodes(191) and a repair member. The plural gate lines are formed on the substrate. The plural data lines cross the gate lines. The plural TFTs are connected with the gate and data lines. The plural pixel electrodes are connected with the TFTs, and arranged in a matrix form. The pixel electrode has a first side parallel to the gate line and has a second side which is shorter than the first side and adjacent to the first side. The repair member is overlapped with the pixel electrode.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY}

1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is an equivalent circuit diagram of one pixel of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a layout view of a liquid crystal display according to an exemplary embodiment of the present invention.

4 and 5 are cross-sectional views of the liquid crystal display of FIG. 3 taken along lines IV-IV and V-V, respectively.

FIG. 6 is a layout view illustrating the repair of the liquid crystal display shown in FIG. 3. FIG.

7 is a layout view of a liquid crystal display according to another exemplary embodiment of the present invention.

<Description of Drawing>

11, 21: alignment film 12, 22: polarizing plate

81, 82: contact auxiliary member

100: transistor display panel 110, 210: substrate

121: gate line 124: gate electrode

131: sustain electrode line 137: sustain electrode

140: gate insulating film 154: semiconductor

163 and 165: ohmic contact 171: data line

173: source electrode 175: drain electrode

180: protective film 181, 182, 185: contact hole

191: pixel electrode 200: color filter display panel

220: light blocking member 230: color filter

270 common electrode

The present invention relates to a liquid crystal display device.

The liquid crystal display is one of the most widely used flat panel display devices, and includes two display panels on which an electric field generating electrode such as a pixel electrode and a common electrode are formed, and a liquid crystal layer interposed therebetween. The liquid crystal display generates an electric field in the liquid crystal layer by applying a voltage to the field generating electrode, thereby determining an orientation of liquid crystal molecules in the liquid crystal layer and controlling the polarization of incident light to display an image.

The liquid crystal display also includes a switching element connected to each pixel electrode and a plurality of signal lines such as a gate line and a data line for controlling the switching element and applying a voltage to the pixel electrode. The gate line generates a gate signal generated by the gate driving circuit, the data line transfers the data voltage generated by the data driving circuit, and the switching element transfers the data voltage to the pixel electrode according to the gate signal.

The gate driving circuit and the data driving circuit are directly mounted on the display panel in the form of a plurality of integrated circuit chips or mounted on a flexible circuit film and attached to the display panel. Such integrated circuit chips have a high ratio in the manufacturing cost of the liquid crystal display device. do. In particular, since the data driving integrated circuit chip is very expensive compared to the gate driving circuit chip, the number of high resolution, large area liquid crystal display devices needs to be reduced. In the case of the gate driving circuit, the cost can be reduced by integrating the gate line, the data line, and the switching element together with the display panel. However, the data driving circuit is more complicated in structure and difficult to integrate into the display panel. .

On the other hand, when pixel defects occur in such a liquid crystal display, it may be difficult to easily repair the process.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a liquid crystal display device that can easily repair pixel defects in a structure in which the number of data driving circuit chips provided in the liquid crystal display device is reduced.

According to an exemplary embodiment of the present invention, a liquid crystal display device includes a substrate, a plurality of gate lines formed on the substrate, a plurality of data lines crossing the gate lines, the gate lines, and the data lines. A plurality of thin film transistors connected to the thin film transistors and arranged in a matrix form, the first side parallel to the gate line and the second side shorter than the first side and adjacent to the first side. A plurality of pixel electrodes having sides and a repair member overlapping the pixel electrodes are included.

The repair member may overlap the gate line.

The repair member may be made of the same material as the data line.

The display device may further include a first short point connecting the repair member and the gate line, and a second short point connecting the repair member and the pixel electrode.

The repair member may be made of the same material as the gate line.

The display device may further include a third shorting point connecting the repair member and the pixel electrode.

The display device may further include a storage electrode line overlapping at least a portion of the pixel electrode.

The storage electrode line may be positioned on the same layer as the data line.

The length of the first side may be three times the length of the second side.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. Like parts are designated by like reference numerals throughout the specification. When a part of a layer, film, area, plate, etc. is said to be "on" another part, this includes not only the other part being "right over" but also another part in the middle. On the contrary, when a part is "just above" another part, there is no other part in the middle.

Next, a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a block diagram of a liquid crystal display according to an exemplary embodiment of the present invention, and FIG. 2 is an equivalent circuit diagram of one pixel of the liquid crystal display according to an exemplary embodiment of the present invention.

1 and 2, a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel assembly 300, a gate driver 400, a data driver 500, and a data driver connected thereto. The gray voltage generator 800 connected to the 500 and a signal controller 600 for controlling the gray voltage generator 800 are included.

The liquid crystal panel assembly 300 includes a plurality of display signal lines and a plurality of pixels PX1, PX2, and PX3 connected to the display signal lines and arranged in a substantially matrix form when viewed in an equivalent circuit. In contrast, in the structure shown in FIG. 2, the liquid crystal panel assembly 300 includes a lower and upper panel 100 and 200 facing each other and a liquid crystal layer 3 interposed therebetween.

The signal lines G ₁ -G _n and D ₁ -D _m are a plurality of gate lines G ₁ -G _n for transmitting a gate signal (also called a “scan signal”) and a plurality of data lines for transmitting a data signal ( D ₁ -D _m ). The gate lines G ₁ -G _n extend substantially in the row direction and are substantially parallel to each other, and the data lines D ₁ -D _m extend substantially in the column direction and are substantially parallel to each other.

Each of the pixels PX1, PX2, and PX3 has a long structure in the row direction. For example, the pixels PX1, PX2, and PX3 connected to the gate line DL and the data line D1 are connected to the signal lines GL and DL. And a switching capacitor Q, a liquid crystal capacitor Clc, and a storage capacitor Cst connected thereto. Holding capacitor Cst can be omitted as needed.

The switching element Q is a three-terminal element of a thin film transistor or the like provided in the lower panel 100. The control terminal is connected to the gate line GL, and the input terminal is connected to the data line DL. The output terminal is connected to the liquid crystal capacitor Clc and the storage capacitor Cst.

The liquid crystal capacitor Clc has two terminals, the pixel electrode 191 of the lower panel 100 and the common electrode 270 of the upper panel 200, and the liquid crystal layer 3 between the two electrodes 191 and 270 is a dielectric material. Function as. The pixel electrode 191 is connected to the switching element Q, and the common electrode 270 is formed on the front surface of the upper panel 200 and receives the common voltage Vcom. Unlike in FIG. 2, the common electrode 270 may be provided in the lower panel 100. In this case, at least one of the two electrodes 191 and 270 may be formed in a linear or bar shape.

The storage capacitor Cst, which serves as an auxiliary part of the liquid crystal capacitor Clc, is formed by overlapping a separate signal line (not shown) and the pixel electrode 191 provided on the lower panel 100 with an insulator interposed therebetween. A predetermined voltage such as the common voltage Vcom is applied to the separate signal line. However, the storage capacitor Cst may be formed such that the pixel electrode 191 overlaps the front gate line directly above the insulator.

On the other hand, in order to implement color display, each pixel PX1-PX3 displays one of the primary colors uniquely (spatial division) or each pixel PX1-PX3 alternately displays the primary colors over time. (Time division) so that the desired color is recognized by the spatial and temporal sum of these primary colors. Examples of the primary colors include three primary colors such as red, green, and blue. FIG. 2 shows that each pixel PX1-PX3 has a color filter 230 representing one of the primary colors in an area of the upper panel 200 corresponding to the pixel electrode 191 as an example of spatial division. have. Unlike FIG. 2, the color filter 230 may be formed above or below the pixel electrode 191 of the lower panel 100. The color filters 230 of the pixels PX1 to PX3 adjacent to each other in the row direction are connected to each other and extend in the row direction, and color filters 230 that display different colors are alternately arranged in the column direction.

In the future, it is assumed that each color filter 230 represents any one of red, green, and blue, a pixel including the red color filter 230 is represented by a red pixel, a pixel including the green color filter 230 is represented by a green pixel, The pixel with the blue color filter 230 is called a blue pixel. The red pixels, the blue pixels, and the green pixels are alternately arranged in the column direction.

As such, the pixels PX1 to PX3 of the three primary colors form one dot DT, which is a basic unit of image display.

Referring back to FIG. 1, the gate driver 400 is integrated in the liquid crystal panel assembly 300 together with the signal lines G ₁ -G _n , D ₁ -D _m and the thin film transistor switching element Q. The left and right sides of the display panel assembly 300 are respectively located. The gate device 400 applies a gate signal formed of a combination of the gate-on voltage Von and the gate-off voltage Voff to the gate lines G ₁ -G _n . The gate driver 400 may be mounted directly on the assembly 300 in the form of an integrated circuit chip, or may be mounted on a flexible printed circuit film (not shown) to form a tape carrier package (TCP). The liquid crystal display may be attached to the liquid crystal panel assembly 300 or mounted on a separate printed circuit board (not shown).

At least one polarizer (not shown) for polarizing light is attached to an outer surface of the liquid crystal panel assembly 300.

The gray voltage generator 800 generates two sets of gray voltages (or reference gray voltage sets) related to the transmittance of the pixel PX. One of the two sets has a positive value for the common voltage Vcom and the other set has a negative value.

The data driver 500 is connected to the data lines D ₁ -D _m of the liquid crystal panel assembly 300 and selects a gray voltage from the gray voltage generator 800 and uses the data line D ₁ as a data signal. -D _m ). However, when the gray voltage generator 800 provides only a predetermined number of reference gray voltages instead of providing all of the voltages for all grays, the data driver 500 divides the reference gray voltages to divide the gray voltages for all grays. Generate and select the data signal from it. The data driver 500 is mounted directly on the liquid crystal panel assembly 300 in the form of an integrated circuit chip, or mounted on a flexible printed circuit film (not shown) to form a tape carrier package (TCP). Or attached to a liquid crystal panel assembly 300, or mounted on a separate printed circuit board (not shown). However, the signal lines G ₁ -G _n , D ₁ -D _m and the thin film transistor switching element Q may be integrated in the liquid crystal panel assembly 300.

The signal controller 600 controls the gate driver 400, the data driver 500, and the like.

Next, the operation of the liquid crystal display will be described in detail.

The signal controller 600 receives input image signals R, G, and B and an input control signal for controlling the display thereof from an external graphic controller (not shown) and processes the input image signals according to operating conditions of the liquid crystal panel assembly 300. After the gate control signal CONT1 and the data control signal CONT2 are generated, the gate control signal CONT1 and the data control signal CONT2 are generated and sent to the gate driver 400 and the data driver 500, respectively.

The gate driver 400 applies the gate-on voltage Von to the gate lines G ₁ -G _n in response to the gate control signal CONT1 from the signal controller 600, thereby applying the gate lines G ₁ -G _n . Turn on the switching element (Q) connected to. Then, the data signal applied to the data lines D ₁ -D _m is applied to the pixel PX through the switching element Q turned on.

The difference between the voltage of the data signal applied to the pixel PX and the common voltage Vcom is shown as the charging voltage of the liquid crystal capacitor Clc, that is, the pixel voltage. The arrangement of the liquid crystal molecules varies depending on the magnitude of the pixel voltage, thereby changing the polarization of light passing through the liquid crystal layer 3. The change in polarization is represented by a change in the transmittance of light by a polarizer attached to the display panel assembly 300, whereby the pixel PX displays the luminance represented by the gray level of the image signal DAT.

Next, an example of the liquid crystal panel assembly 300 will be described in detail with reference to FIGS. 3 to 5.

3 is a layout view of a liquid crystal panel assembly according to an exemplary embodiment of the present invention, and FIGS. 4 and 5 are cross-sectional views of the liquid crystal panel assembly illustrated in FIG. 3 taken along lines IV-IV and V-V, respectively.

3 to 5, a liquid crystal panel assembly according to an exemplary embodiment of the present invention may include a thin film transistor array panel 100, a common electrode display panel 200, and a liquid crystal layer interposed between the two display panels 100 and 200. Include 3).

First, the thin film transistor array panel 100 will be described.

A plurality of gate lines 121 are formed on an insulating substrate 110 made of transparent glass or plastic.

The gate line 121 transmits a gate signal and mainly extends in a horizontal direction. Each gate line 121 includes a plurality of gate electrodes 124 protruding upward or downward and a wide end portion 129 for connection with another layer or an external driving circuit. The gate line 121 includes a front gate line 121u and a rear gate line 121d adjacent thereto.

The gate line 121 may be formed of aluminum-based metal such as aluminum (Al) or aluminum alloy, silver-based metal such as silver (Ag) or silver alloy, copper-based metal such as copper (Cu) or copper alloy, molybdenum (Mo) or molybdenum alloy, etc. It may be made of molybdenum-based metal, chromium (Cr), tantalum (Ta) and titanium (Ti). However, they may have a multilayer structure including two conductive films (not shown) having different physical properties.

The side surface of the gate line 121 is inclined with respect to the surface of the substrate 110, and the inclination angle is preferably about 30 ° to about 80 °.

A gate insulating layer 140 made of silicon nitride (SiNx) or silicon oxide (SiOx) is formed on the gate line 121.

On the gate insulating layer 140, a plurality of island semiconductors 154 made of hydrogenated amorphous silicon (amorphous silicon is abbreviated as a-Si), polycrystalline silicon, or the like are formed. The semiconductor 154 is positioned over the gate electrode 124.

A plurality of island type ohmic contacts 163 and 165 are formed on the semiconductor 154. The ohmic contacts 163 and 165 may be made of a material such as n + hydrogenated amorphous silicon in which n-type impurities such as phosphorus are heavily doped, or may be made of silicide. The ohmic contacts 163 and 165 are paired and disposed on the semiconductor 154.

Side surfaces of the semiconductor 154 and the ohmic contacts 163 and 165 are also inclined with respect to the surface of the substrate 110, and the inclination angle is about 30 ° to 80 °.

The plurality of data lines 171, the plurality of drain electrodes 175, the plurality of storage electrode lines 131, and the repair member are disposed on the ohmic contacts 163 and 165 and the gate insulating layer 140. 178 is formed.

The data line 171 transmits a data signal and mainly extends in the vertical direction to cross the gate line 121. Each data line 171 includes a plurality of source electrodes 173 extending toward the gate electrode 124 and an end portion 179 having a large area for connection with another layer or an external driving circuit.

The drain electrode 175 is separated from the data line 171 and faces the source electrode 173 with respect to the gate electrode 124. Each drain electrode 175 includes one end portion having a large area and the other end portion having a rod shape, and the rod end portion is partially surrounded by the source electrode 173 bent in a U shape. The source electrode 173 and the drain electrode 175 are approximately symmetrical.

One gate electrode 124, one source electrode 173, and one drain electrode 175 together with the semiconductor 154 form one thin film transistor (TFT), and a channel of the thin film transistor. ) Is formed in the semiconductor 154 between the source electrode 173 and the drain electrode 175.

The storage electrode line 131 receives a predetermined voltage such as a common voltage, and has a stem line extending substantially parallel to the data line 171 and a plurality of first, second and third storage electrodes 137a, 137b, and 137c split therefrom. It includes. The first and third sustain electrodes 137a and 137c extend in parallel with the gate line 121 and are adjacent to the gate line 121. The second storage electrode 137b connects the first and third storage electrodes 137a and 137c and extends in parallel with the data line 171. The storage electrodes of the two vertically adjacent pixels are connected through the connection part 134. However, the shape and arrangement of the storage electrode line 131 may be modified in various ways.

A part of the repair member 178 partially overlaps the front gate line 121u and is separated from the drain electrode 175 and the sustain electrodes 137a, 137b, and 137c.

The data line 171, the drain electrode 175, the storage electrode line 131, and the repair member 178 may be made of a refractory metal such as molybdenum, chromium, tantalum, and titanium, or an alloy thereof. It may have a multilayer structure including a metal film (not shown) and a low resistance conductive film (not shown). However, the data line 171, the drain electrode 175, the storage electrode line 131, and the repair member 178 may be made of various other metals or conductors.

The data line 171, the drain electrode 175, the storage electrode line 131, and the repair member 178 may also be inclined at an inclination angle of about 30 ° to about 80 ° with respect to the surface of the substrate 110.

The ohmic contacts 163 and 165 exist only between the semiconductor 154 thereunder and the data line 171 and the drain electrode 175 thereon to lower the contact resistance therebetween. The semiconductor 154 includes portions exposed between the source electrode 173 and the drain electrode 175 and not covered by the data line 171 and the drain electrode 175.

A passivation layer 180 is formed on the data line 171, the drain electrode 175, and the exposed semiconductor 154. The passivation layer 180 is made of an inorganic insulator such as silicon nitride and silicon oxide. However, the passivation layer 180 may be made of an organic insulator and may have a flat surface. In the case of the organic insulator, it may have photosensitivity, and its dielectric constant is preferably about 4.0 or less. The passivation layer 180 may also have a double layer structure of the lower inorganic layer and the upper organic layer so as not to damage the exposed portion of the semiconductor 154 while maintaining excellent insulating properties of the organic layer.

In the passivation layer 180, a plurality of contact holes 185 exposing the end portion 179 and the drain electrode 175 of the data line 171 are formed, respectively, and the passivation layer 180 and the gate insulating layer 140 are formed. ), A plurality of contact holes 181 exposing the end portion 129 of the gate line 121 is formed.

A plurality of pixel electrodes 191, a plurality of connection members 81, and a plurality of contact assistants 82 are formed on the passivation layer 180. They may be made of a transparent conductive material such as ITO or IZO or a reflective metal such as aluminum, silver, chromium or an alloy thereof.

At least a portion of the pixel electrode 191 overlaps the repair member 178.

Each pixel electrode 191 has four peripheral sides substantially parallel to the gate line 121 or the data line 171. The two horizontal sides 191l parallel to the gate line 121 are longer than the length of two vertical sides 191s parallel to the data line 171 and are approximately three times as long. Therefore, the number of pixel electrodes 191 positioned in each row is smaller than that of the horizontal side smaller than the vertical side, and the number of pixel electrodes 191 positioned in each column is larger. Therefore, since the total number of data lines 171 is reduced, the number of integrated circuit chips for the data driver 500 may be reduced, thereby reducing material costs. Of course, although the number of gate lines 121 increases, the gate driver 400 can be integrated into the assembly 300 together with the gate lines 121, the data lines 171, and the thin film transistors. The increase is not a problem. In addition, even if the gate driver 400 is mounted in the form of an integrated circuit chip, it is more advantageous to reduce the number of integrated circuit chips for the data driver 500 because the price of the integrated circuit chip for the gate driver 400 is relatively low.

The pixel electrode 191 is physically and electrically connected to the drain electrode 175 through the contact hole 185 and receives a data voltage from the drain electrode 175. The pixel electrode 191 to which the data voltage is applied generates an electric field together with the common electrode 270 of the common electrode display panel 200 to which the common voltage is applied, thereby liquid crystal of the liquid crystal layer 3 between the two electrodes 191 and 270. Determine the orientation of the molecule. The polarization of light passing through the liquid crystal layer 3 varies according to the direction of the liquid crystal molecules determined as described above. The pixel electrode 191 and the common electrode 270 form a liquid crystal capacitor to maintain an applied voltage even after the thin film transistor is turned off.

The pixel electrode 191 overlaps the storage electrode lines 131 including the storage electrodes 137a-c to form a storage capacitor that enhances the voltage holding capability of the liquid crystal capacitor. When the storage electrode line 131 is disposed in this manner, electromagnetic interference formed between the gate line 121 and the pixel electrode 191 is blocked by the storage electrodes 137a-c to stably stabilize the voltage of the pixel electrode 191. Can be maintained. Such a structure also reduces the width in the horizontal direction occupied by the pixel due to the vertical conducting wire in comparison with the structure in which the sustain electrodes 137a-c are disposed near the left and right boundaries of the pixel electrode 191. It is possible to secure enough space for the integration of 400). The storage electrodes 137a-c also serve to block light leakage between the pixel electrodes 191. The step difference caused by the stem line of the storage electrode line 131 being disposed in the center of the pixel electrode 191 can be compensated by smoothing the side slope of the storage electrode line 131.

The contact auxiliary member 82 is connected to the end portion 179 of the data line 171 through the contact hole 182. The contact assisting member 82 compensates for and protects the adhesion between the end portion 179 of the data line 171 and the external device.

Next, the upper panel 200 will be described.

A light blocking member 220 is formed on an insulating substrate 210 made of transparent glass, plastic, or the like. The light blocking member 220 is also called a black matrix and prevents light leakage.

A plurality of color filters 230 is also formed on the substrate 210 and the light blocking member 220. The color filter 230 is mostly present in an area surrounded by the light blocking member 220, and may extend long along the row of pixel electrodes 191. Each color filter 230 may display one of primary colors such as three primary colors of red, green, and blue.

An overcoat 250 is formed on the color filter 230 and the light blocking member 220. The overcoat 250 may be made of an organic insulator, and may prevent the color filter 230 from being exposed and provide a flat surface. The overcoat 250 may be omitted.

Alignment layers 11 and 21 are coated on inner surfaces of the display panels 100 and 200, and they may be vertical alignment layers. Polarizers 12 and 22 are provided on the outer surfaces of the display panels 100 and 200, and polarization axes of the two polarizers may be parallel or orthogonal to each other. In the case of a reflective liquid crystal display, one of two polarizers may be omitted.

The liquid crystal display according to the present exemplary embodiment may further include a phase retardation film (not shown) for compensating for the delay of the liquid crystal layer 3. The liquid crystal display may also include a polarizer 12 and 22, a phase retardation film, display panels 100 and 200, and a backlight unit (not shown) for supplying light to the liquid crystal layer 3.

The liquid crystal layer 3 has positive or negative dielectric anisotropy, and the liquid crystal molecules 31 of the liquid crystal layer 3 have their long axes substantially parallel or perpendicular to the surfaces of the two display panels 100 and 200 in the absence of an electric field. Is oriented to achieve.

Hereinafter, repair of a bad pixel generated in the liquid crystal display according to the exemplary embodiment of the present invention will be described in detail with reference to FIG. 6.

FIG. 6 is a layout view illustrating how to repair defective pixels of the liquid crystal display illustrated in FIG. 3.

As illustrated in FIG. 6, when the foreign material 50 is introduced between the pixel electrode 191 and the data line 171, the pixel electrode 191 and the data line 171 may be shorted. Then, the data voltage flowing through the data line 171 is continuously applied to the pixel electrode 191. Therefore, the gray scale voltage corresponding to the luminance to be displayed on the liquid crystal display cannot be appropriately applied to the pixel electrode 191, so that the pixel becomes a defective pixel that cannot contribute to the normal display operation of the liquid crystal display.

Therefore, in such a case, the defective pixel is repaired by using the repair member 178 provided in the pixel.

That is, the first shorting point P1 is formed at a portion where the repair member 178 and the front gate line 121 overlap each other by using a laser or the like to physically and electrically connect the repair member 178 and the front gate line 121. do. Also, a second short point P2 is formed at a portion where the repair member 178 and the pixel electrode 191 overlap with each other by using a laser or the like to physically and electrically connect the repair member 178 and the pixel electrode 191.

Then, the front gate line 121 and the pixel electrode 191 are electrically connected to each other through the repair member 178, and a gate voltage flowing along the front gate line 121 is applied to the pixel electrode 191. The gate voltage includes a gate on voltage Von and a gate off voltage Voff, and the time for which the gate on voltage Von is applied is relatively shorter than the time for which the gate off voltage Voff is applied. Therefore, the gate-off voltage Voff is applied to the pixel electrode 191 where the defect occurs for most of the time, and the defective pixel displays black, which does not contribute to the display operation of the liquid crystal display. As a result, deterioration of the display of the liquid crystal display may be prevented by representing a voltage corresponding to an abnormal gray level of the bad pixel.

A liquid crystal panel assembly according to another exemplary embodiment of the present invention will now be described in detail with reference to FIG. 7.

7 is a layout view of a liquid crystal panel assembly according to another exemplary embodiment of the present invention.

The liquid crystal panel assembly according to the present exemplary embodiment also includes a lower panel (not shown) and an upper panel (not shown) facing each other and a liquid crystal layer (not shown) interposed between the two display panels.

The layered structure of the liquid crystal panel assembly according to the present embodiment is usually the same as the layered structure of the liquid crystal panel assembly shown in Figs.

Referring to the lower panel, a plurality of gate conductors including a plurality of gate lines 121 is formed on an insulating substrate (not shown). Each gate line 121 includes a gate electrode 124 and an end portion 129. A gate insulating film (not shown) is formed on the gate conductor 121. An island semiconductor 154 is formed on the gate insulating film, and a plurality of ohmic contacts (not shown) are formed thereon. A data conductor including a plurality of data lines 171, a plurality of drain electrodes 175, and a storage electrode line 131 is formed on the ohmic contact member and the gate insulating layer. The data line 171 includes a plurality of source electrodes 173 and end portions 179. The storage electrode line 131 includes a plurality of storage electrodes 137a, 137b, and 137c and the connection part 134. A passivation layer (not shown) is formed on the data conductors 171 and 175 and the exposed portion of the semiconductor 154, and a plurality of contact holes 181, 182, and 185 are formed in the passivation layer and the gate insulating layer. A plurality of pixel electrodes 191 and a plurality of contact auxiliary members 81 and 82 are formed on the passivation layer. An alignment layer (not shown) is formed on the pixel electrode 191, the contact auxiliary members 81 and 82, and the passivation layer.

Referring to the upper panel, a light blocking member (not shown), a plurality of color filters (not shown), an overcoat (not shown), a common electrode (not shown) on an insulating substrate (not shown), and An alignment film (not shown) is formed.

In the liquid crystal display according to the present exemplary embodiment, unlike the liquid crystal display illustrated in FIGS. 3 to 5, the front gate line 121 includes the repair member 125. That is, a portion of the front gate line 121 protrudes downward to overlap the pixel electrode 191 to form the repair member 125.

In the liquid crystal display according to the present exemplary embodiment, the foreign material 50 may flow between the pixel electrode 191 and the data line 171 to short-circuit the pixel electrode 191 and the data line 171. In this case, a third short point P3 is formed at a portion where the repair member 125 and the pixel electrode 191 overlap with each other by using a laser or the like to electrically connect the repair member 125 and the pixel electrode 191. Then, the gate voltage flowing through the front gate line 121 is applied to the pixel electrode 191. That is, since the gate off voltage Voff is applied to the pixel electrode 191, the pixel electrode 191 displays black. Therefore, the display operation of the bad pixel can be prevented.

According to the present invention, while reducing the number of data driving circuit chips of the liquid crystal display, when the pixel failure occurs, it can be easily repaired without reducing the aperture ratio of the pixel.

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims (9)

Board, A plurality of gate lines formed on the substrate, A plurality of data lines intersecting the gate lines, A plurality of thin film transistors connected to the gate line and the data line, A plurality of pixel electrodes connected to the thin film transistors and arranged in a matrix form and having a first side parallel to the gate line and a length shorter than the first side and adjacent to the first side; , And Repair member overlapping the pixel electrode Liquid crystal display comprising a. In claim 1, And the repair member overlaps the gate line. In claim 2, And the repair member is made of the same material as the data line. In claim 3, A first short circuit point connecting the repair member and the gate line, and A second short point connecting the repair member and the pixel electrode Liquid crystal display further comprising. In claim 1, The repair member is made of the same material as the gate line. In claim 5, And a third short point connecting the repair member and the pixel electrode. In claim 1, And a storage electrode line at least partially overlapping the pixel electrode. In claim 7, And the storage electrode line is on the same layer as the data line. In claim 1, The length of the first side is three times the length of the second side.

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