KR20060015207A - Substrate for a display panel, liquid crystal display panel and method for repairing the same - Google Patents

Abstract

The liquid crystal display panel includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes an upper plate and a common electrode. The second substrate includes a lower plate, a gate line disposed on the lower plate and electrically connected to a gate electrode of a switching element, a storage capacitor line disposed on the lower plate, and on the gate line and the capacitor line. And a repair pattern disposed on the insulation layer and overlapping a portion of the gate line and a portion of the storage capacitor line. The liquid crystal layer is disposed between the common electrode and the pixel electrode of the second substrate. Therefore, the malfunction of the plurality of thin film transistors is prevented, thereby improving the image quality of the display panel.

Description

Substrate for A Display Panel, Liquid Crystal Display Panel and Method for Repairing The Same}

1 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a plan view illustrating a liquid crystal display panel according to a first exemplary embodiment of the present invention.

3 is a cross-sectional view taken along the line II ′ of FIG. 2.

4 is a cross-sectional view taken along the line II-II 'of FIG. 2.

5 is a cross-sectional view taken along the line III-III ′ of FIG. 2.

6 is a plan view illustrating a failure occurring in the liquid crystal display panel illustrated in FIG. 2.

FIG. 7 is a cross-sectional view taken along the line VI-VI 'of FIG. 6.

8 is a plan view illustrating a liquid crystal display panel according to a second exemplary embodiment of the present invention.

9 is a cross-sectional view taken along the line VV ′ of FIG. 8.

10 to 14 are cross-sectional views illustrating a method of manufacturing a liquid crystal display panel according to a second embodiment of the present invention.                 

FIG. 15 is a plan view illustrating a failure occurring in the liquid crystal display panel illustrated in FIG. 8.

FIG. 16 is a cross-sectional view taken along the line VI-VI 'of FIG. 15.

17 to 19 are plan views illustrating a method for removing defects of a liquid crystal display panel according to a second exemplary embodiment of the present invention.

20 is a plan view illustrating a liquid crystal display panel according to a third exemplary embodiment of the present invention.

FIG. 21 is a cross-sectional view taken along the line VII-VII ′ of FIG. 20.

Explanation of symbols on the main parts of the drawings

10 liquid crystal display panel 11 second substrate

12 gate driver 13 data driver

20: printed circuit board 25: flexible circuit board

100: upper plate 102: black matrix

104a, 104b: color filter 105: overcoating layer

106: common electrode 108: liquid crystal layer

112 pixel electrode 114 organic film

116: passivation film 118a: source electrode

118a ': data line 118b: gate electrode

118b ': gate line 118c: drain electrode

119 thin film transistor 120 bottom plate                 

122: storage capacitor line 123: storage capacitor

126: gate insulating film 130: repair pattern

140: Particles

141a, 141b, 142a, 142b, 146a, 146b: open part

144a, 144b, 144c, 144d: Contact hole for repair pattern

170: first substrate

180: second substrate

The present invention relates to a substrate for a display panel, a liquid crystal display panel and a defect removing method thereof, and more particularly, to a display panel substrate having an improved image quality, a liquid crystal display panel having an improved image quality, and a defect removing method.

A liquid crystal display (LCD) applies an electric field to a liquid crystal material having an anisotropic dielectric constant injected between an array substrate and a counter substrate on which a thin film transistor is formed. A display device that obtains a desired image signal by controlling an intensity of an electric field to adjust an amount of light transmitted through a substrate.

The array substrate includes a thin film transistor, a gate line and a data line. The thin film transistor includes a gate electrode electrically connected to the gate line, a source electrode electrically connected to the data line, a drain electrode, and a semiconductor layer pattern. The thin film transistor, the gate line, and the data line are formed through a plurality of thin film deposition processes. In this case, when an etching failure occurs during the thin film deposition process, the gate electrode may be electrically insulated from the gate line. In addition, when impurities are present during the thin film deposition process, the gate electrode may be shorted to the source electrode or the drain electrode.

When the gate electrode is electrically insulated from the gate line, no voltage is applied between the pixel electrode of the array substrate and the common electrode of the opposite substrate.

When the gate electrode is shorted to the source electrode or the drain electrode, the thin film transistor malfunctions and the contrast ratio is reduced.

In particular, when the contrast ratio is reduced, the image quality of the liquid crystal display is drastically reduced.

The first object of the present invention for solving the above problems is to provide a display panel substrate with improved image quality.

It is a second object of the present invention to provide a liquid crystal display panel with improved image quality.

It is a third object of the present invention to provide a method of removing a defect of the display panel.

A display panel substrate according to an exemplary embodiment of the present invention for achieving the first object includes a plate, a gate line, a storage capacitor line, an insulating film, a pixel electrode, and a repair pattern. The gate line is disposed on the plate and electrically connected to the gate electrode of the switching element. The storage capacitor line is disposed on the plate. The insulating layer is disposed on the gate line and the capacitor line. The pixel electrode is disposed on the insulating layer, is electrically connected to the drain electrode of the switching element, and overlaps a portion of the storage capacitor line. The repair pattern is disposed on the insulating layer and overlaps a portion of the gate line and a portion of the storage capacitor line.

A liquid crystal display panel according to an exemplary embodiment of the present invention for achieving the second object includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate includes an upper plate and a common electrode disposed on the upper plate. The second substrate includes a lower plate, a gate line disposed on the lower plate and electrically connected to a gate electrode of a switching element, a storage capacitor line disposed on the lower plate, and on the gate line and the capacitor line. An insulating film disposed on the insulating film, a pixel electrode disposed on the insulating film, and electrically connected to a drain electrode of the switching element, and overlapping a portion of the storage capacitor line, a portion of the gate line disposed on the insulating film; It includes a repair pattern overlapping a portion of the storage capacitor line. The liquid crystal layer is disposed between the common electrode and the pixel electrode.                     

In the method of removing a defect of a display panel according to an exemplary embodiment of the present invention, first, both sides of a gate line adjacent to a malfunctioning thin film transistor are opened to electrically insulate the thin film transistor from the gate line. Let's do it. Subsequently, repair patterns arranged adjacent to the thin film transistor are electrically connected to the gate line and the storage capacitor line spaced apart from the gate line. Finally, both sides of the storage capacitor line disposed on the opposite side of the thin film transistor are opened based on the repair patterns.

The display panel includes the liquid crystal display panel (LCD), an organic electroluminescent display panel (OLED), a plasma display panel (PDP), and the like.

Therefore, even when a plurality of thin film transistors malfunction, the malfunction of the plurality of thin film transistors is prevented, thereby improving the image quality of the display panel. In addition, the display panel can be easily repaired, thereby reducing manufacturing and repair costs and improving yield.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display includes a liquid crystal display panel 10 for displaying an image, a gate driver 12 for driving the liquid crystal display panel 10, and a data driver for applying a data signal to the liquid crystal display panel. (13).

The liquid crystal display panel 10 includes a first substrate (not shown), a second substrate 11, and a liquid crystal layer disposed between the first substrate (not shown) and the second substrate 11 (not shown). Not included). The liquid crystal display panel 10 is divided into a display portion DP for displaying an image and a peripheral portion PP adjacent to the display portion.

The second substrate 11 includes a plurality of thin film transistors TFT, a plurality of gate lines GL, a plurality of data lines DL, a plurality of storage capacitor lines SL, and a first repair line RL1) and a second repair line RL2. The gate lines GL, the data lines DL, and the storage capacitor lines SL are disposed in the display unit DP. The data lines DL and the gate lines GL cross each other to define a plurality of pixel regions. Each of the data lines DL is electrically connected to a source electrode of each of the thin film transistors. The gate lines GL are electrically connected to gate electrodes of the thin film transistors TFT. The drain electrodes of the TFTs are connected to the pixel electrodes. The pixel electrode, the common electrode of the first substrate (not shown), and the liquid crystal layer (not shown) disposed between the pixel electrode and the common electrode form a liquid crystal capacitor Clc. The storage capacitor line SL overlaps a portion of the pixel electrode to form a storage capacitor Cst.

The gate lines GL may include a metal such as aluminum or an aluminum alloy. The data lines DL include a metal such as chromium, molybdenum, chromium alloy, and molybdenum alloy. In this case, the specific resistance p of the aluminum is about 4.5, and the specific resistance p of chromium is about 21.

The gate driver 12 applies gate signals to the gate lines GL. The data driver 13 applies data signals to the data lines DL.

The printed circuit board 20 transmits driving signals for driving the gate driver 12 and the data driver 13 through the flexible circuit board 25 in response to various signals provided from an external device (not shown). 2 is applied to the gate driver 12 and the data driver 13 of the substrate 11.

When the gate electrode and the drain electrode of the thin film transistor electrically connected to the i-th gate line GLi and the j-th data line DLi are short-circuited, the thin film transistor malfunctions and the image quality of the liquid crystal display is degraded. Therefore, in order to block the signal applied to the malfunctioning thin film transistor, a part of the j-th data line adjacent to the malfunctioning thin film transistor is opened. In this case, a portion of the j-th data line adjacent to the thin film transistor may be opened by irradiating a laser to a portion of the j-th data line adjacent to the thin film transistor.

In this case, since the data signal is applied from the end connected to the data driver 13 to the upper portion of the j-th data line, the data signal is applied to the j-th data line disposed below the liquid crystal display panel 10. To this end, the first repair line FRL and the upper and lower portions of the j-th data line are electrically connected to each other. In this case, the upper and lower portions of the j-th data line may be irradiated with a laser to electrically connect the first repair line FRL to the upper and lower portions of the j-th data line. An upper portion of the j th data line is electrically connected to the first repair line FRL through a first point LP1. A lower portion of the j th data line is electrically connected to the first repair line FRL through a second point LP2. Accordingly, the data signal is applied to the j-th data line disposed below the liquid crystal display panel 10 through the first point LP1, the first repair line FRL, and the second point LP2.

If another thin film transistor malfunctions, the second repair line SRL may be used to prevent the malfunction.

Example  One

2 is a plan view illustrating a liquid crystal display panel according to a first exemplary embodiment of the present invention, FIG. 3 is a cross-sectional view taken along the line II ′ of FIG. 2, and FIG. 4 is a cross-sectional view taken along the line II-II ′ of FIG. 2. 5 is a cross-sectional view taken along the line III-III ′ of FIG. 2.

2 to 5, the liquid crystal display panel includes a first substrate 170, a second substrate 180, and a liquid crystal layer 108.

The first substrate 170 includes an upper plate 100, a black matrix 102, an overcoating layer 105, and a common electrode 106.

The second substrate 180 may include a lower plate 120, a plurality of thin film transistors 119, a plurality of storage capacitors 123, a plurality of data lines 118a ', a plurality of gate lines 118b', and a plurality of substrates. The storage capacitor line 122, the gate insulating film 126, the passivation film 116, the plurality of color filters 104a, the organic film 114, the plurality of pixel electrodes 112, and the first repair line (not shown). And a second repair line (not shown).

The liquid crystal display panel includes a plurality of pixels, which are defined by the data lines 118a 'and the gate lines 118b' adjacent to each other.

The liquid crystal layer 108 is disposed between the first substrate 170 and the second substrate 180.

The upper plate 100 and the lower plate 120 uses a glass of transparent material that can pass light. The glass is alkali free. In the case where the glass has an alkali property, when alkali ions are eluted in the liquid crystal cell in the glass, the liquid crystal specific resistance is lowered to change the display characteristics.

In this case, the upper plate 100 and the lower plate 120 are triacetylcellulose (TAC), polycarbonate (PC), polyethersulfone (PES), polyethylene terephthalate (PET) Polyethylenenaphthalate (PEN), Polyvinylalcohol (PVA), Polymethylmethacrylate (PMMA), Cyclo-Olefin Polymer (COP) and the like.

Preferably, the top plate 100 and the bottom plate 120 are optically isotropic.

The thin film transistor 119 is disposed on the lower plate 120 corresponding to the pixel and includes a source electrode 118a, a gate electrode 118b, a drain electrode 118c, and a semiconductor layer pattern. A data driver (not shown) outputs a data voltage to the source electrode 118a through the data line 118a ', and a gate driver (not shown) outputs a select signal to the gate line (not shown). 118b ') to the gate electrode 118b.

The gate insulating layer 126 is disposed on the lower plate 120 on which the gate electrode 118b is formed to electrically insulate the gate electrode 118b from the source electrode 118a and the drain electrode 118c. . The gate insulating layer 126 may include silicon nitride (SiNx), silicon oxide (SiOx), or the like.

The passivation layer 116 is disposed on the lower plate 120 on which the thin film transistor 119 is formed, and includes a contact hole exposing a portion of the drain electrode 118c. The passivation film 116 includes silicon nitride (SiNx), silicon oxide (SiOx), or the like.

The storage capacitor line 122 is disposed between the lower plate 120 and the gate insulating layer 126 to form the storage capacitor 123 together with a portion of the pixel electrode 112.

The storage capacitor 123 maintains a potential difference between the common electrode 106 and the pixel electrode 112.

The color filter 104a is disposed on the lower plate 120 on which the thin film transistor 119 and the passivation layer 116 are formed to transmit only light having a predetermined wavelength. The color filter 104a includes a red color filter part, a green color filter part, and a blue color filter part. The color filter 104a includes a photopolymerization initiator, a monomer, a binder, a pigment, a dispersant, a solvent, a photoresist, and the like.

The organic layer 114 is disposed on the lower plate 120 on which the thin film transistor 119, the passivation layer 116, and the color filter 104a are formed to adjust the thickness of the liquid crystal layer 108. In addition, the surface of the lower substrate 180 is planarized.

The color filter 104a and the organic layer 114 include a contact hole exposing a part of the drain electrode 108c.

The pixel electrode 112 is formed on a surface of the organic layer 114 corresponding to the pixel and an inner surface of the contact hole to be electrically connected to the drain electrode 118c. The pixel electrode 112 controls the liquid crystal in the liquid crystal layer 108 by a voltage applied between the common electrode 106 and the light transmission. The pixel electrode 112 includes indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZO), or the like, which is a transparent conductive material. In this case, the pixel electrode may include a reflective electrode having a material having a high reflectance. In addition, the pixel electrode may include a transparent electrode having the transparent conductive material and a reflective electrode having a material having a high reflectance disposed on the transparent electrode.

The black matrix 102 is formed on a portion of the upper plate 100 corresponding to the data line 118a 'and the gate line 118b' to block light. The black matrix 102 improves image quality by blocking light passing through an area in which the liquid crystal cannot be controlled.

The black matrix 102 is formed by depositing and etching a metal or metal compound. The metal includes chromium (Cr) and the like, and the metal compound includes chromium oxide (CrOx), chromium nitride (CrNx), and the like. In addition, the black matrix 102 may be formed by applying an opaque organic material including a photoresist component, and then partially removing the applied organic material through a photolithography process. The opaque organics include carbon black, pigment mixtures, dye mixtures, and the like. The pigment mixture comprises red, green and blue pigments and the dye mixture comprises red, green and blue dyes. In this case, a plurality of color filters 104a may be overlapped to form a black matrix on the passivation layer 116 of the second substrate 180.

The overcoat layer 105 is disposed on the upper plate 100 on which the black matrix 102 is formed to protect the black matrix 102 and to planarize the surface of the first substrate 170.

The common electrode 106 is disposed on the overcoat layer 105. The common electrode 106 includes a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZO).

FIG. 6 is a plan view illustrating a failure occurring in the liquid crystal display illustrated in FIG. 2, and FIG. 7 is a cross-sectional view taken along the line VI-VI ′ of FIG. 6.

6 and 7, a particle 140 is disposed between the gate electrode 118b and the drain electrode 118c to short-circuit the gate electrode 118b and the drain electrode 118c. When the gate electrode 118b and the drain electrode 118c are short-circuited, the thin film transistor 119 malfunctions and the image quality of the liquid crystal display panel is degraded. Accordingly, in order to block the data signal applied to the malfunctioning thin film transistor 119, a portion of the data line 118a ′ adjacent to the malfunctioning thin film transistor 119 is irradiated with a laser to expose the thin film transistor ( A portion of the data line 118a 'adjacent to 119 is opened.

Further, in order to apply the data signal to the lower portion of the open data line 118a ', a laser is irradiated to the upper and lower portions of the first repair line (not shown) and the open data line 118a'. Thereby electrically connecting upper and lower portions of the first repair line (not shown) and the open data line 118a '. Accordingly, although the data signal is directly applied from the data driver (not shown) on the open data line 118a ', the data driver (not shown) is under the open data line 118a'. The data signal is bypassed and applied through the first repair line (not shown).

Therefore, when two or less thin film transistors malfunction, the malfunctions may be prevented by using the first and second repair lines (not shown).

Example  2

8 is a plan view illustrating a liquid crystal display panel according to a second exemplary embodiment of the present invention, and FIG. 9 is a cross-sectional view taken along the line VV ′ of FIG. 8. In the present embodiment, the rest of the components except for the repair pattern are the same as those of the first embodiment, and thus detailed descriptions of overlapping portions will be omitted.

8 and 9, the liquid crystal display panel includes a first substrate 170, a second substrate 180, and a liquid crystal layer 108.

The first substrate 170 includes an upper plate 100, a black matrix 102, an overcoating layer 105, and a common electrode 106.

The second substrate 180 may include a lower plate 120, a plurality of thin film transistors 119, a plurality of storage capacitors 123, a plurality of data lines 118a ', a plurality of gate lines 118b', and a plurality of substrates. The storage capacitor line 122, the gate insulating layer 126, the passivation layer 116, the plurality of color filters 104a, the organic layer 114, the plurality of pixel electrodes 112, and the plurality of repair patterns 130 are included. do.

The liquid crystal display panel includes a plurality of pixels, which are defined by data lines 118a 'and gate lines 118b' adjacent to each other.

The repair pattern 130 is disposed between the gate insulating layer 126 and the passivation layer 116 corresponding to the pixel, and an upper end portion and a lower end portion thereof respectively correspond to the storage capacitor line 122 and the gate line 118b '. ).

When the laser is irradiated to a portion where the repair pattern 130 overlaps the storage capacitor line 122 or the gate line 118b ', the repair pattern 130 may include the storage capacitor line 122 or the gate. Is electrically connected to line 118b '.

10 to 14 are cross-sectional views illustrating a method of manufacturing a liquid crystal display panel according to a second embodiment of the present invention.

8 and 10, first, a conductive material is deposited on the lower plate 120. Subsequently, a portion of the conductive material is etched to form the gate electrode 118b, the gate line 118b ′, the storage capacitor line 122, the first repair line (not shown), and the second repair line. (Not shown). Subsequently, the gate electrode 118b, the gate line 118b ′, the storage capacitor line 122, the first repair line (not shown), and the second repair line (not shown) are formed below. The gate insulating layer 126 is deposited on the plate 120. The gate insulating layer 126 includes silicon oxide, silicon nitride, or the like.

8 and 11, an amorphous silicon pattern and an N + amorphous silicon pattern are subsequently formed on the gate insulating layer 126 corresponding to the gate electrode 118b to form the semiconductor layer. Subsequently, a conductive material is deposited on the gate insulating layer 126 on which the semiconductor layer is formed. Subsequently, a portion of the conductive material is etched to form the source electrode 118a, the data line 118a ′, the drain electrode 118c, and the repair pattern 130. Accordingly, the thin film transistor 119 and the repair pattern 130 including the source electrode 118a, the gate electrode 118b, the drain electrode 118c, and the semiconductor layer are formed.

8 and 12, a transparent insulating material is deposited on the lower plate 120 on which the thin film transistor 119 and the repair pattern 130 are formed.

Subsequently, a color filter material is coated on the deposited transparent insulating material. The color filter material includes a photoresist. Thereafter, the organic material is applied onto the applied color filter material. The organic material includes a photoresist. Subsequently, a portion of the applied organic material and color filter material is removed using a photographic process to expose the organic layer 114 and the exposed transparent insulating material corresponding to a part of the drain electrode 118c. The color filter 104a is formed. Subsequently, the deposited transparent insulating material corresponding to a part of the drain electrode 118c is etched using the organic layer 114 and the color filter 104a as an etching mask to etch the passivation layer 116 and the passivation layer. A contact hole is formed.

Subsequently, a transparent conductive material is deposited on the inner surface of the organic layer 114 and the contact hole. The transparent conductive material includes indium tin oxide (ITO), tin oxide (TO), indium zinc oxide (IZO), zinc oxide (ZO), and the like. Subsequently, a portion of the deposited transparent conductive material is etched to form the pixel electrode 112. An insulating layer disposed between the storage capacitor line 122, the pixel electrode 122, the storage capacitor line 122, and the pixel electrode 122 forms the storage capacitor 123.

Accordingly, the lower plate 120, the thin film transistor 119, the storage capacitor 123, the data line 118a ′, the gate line 118b ′, the storage capacitor line 122, and the gate insulating layer 126, the passivation film 116, the color filter 104a, the organic film 114, the pixel electrode 112, the first repair line (not shown), and the second repair line (not shown) Second substrate 180 is formed.                     

8 and 13, an opaque material is subsequently deposited on the top plate 100. Subsequently, some of the opaque material is removed to form the black matrix 102. In this case, after the opaque material and the photoresist are applied onto the upper substrate 100, the black matrix 102 may be formed using a photo process. The photo process includes an exposure process and a development process.

Thereafter, the passivation layer 105 is formed by applying an organic material on the upper plate 100 on which the black matrix 102 is formed. Subsequently, a transparent conductive material is coated on the passivation film 105 to form the common electrode 106.

Accordingly, the first substrate 170 including the lower plate 100, the black matrix 102, the overcoating layer 105, and the common electrode 106 is formed.

8 and 14, the first substrate 170 and the second substrate 180 are then coupled to each other.

Subsequently, the liquid crystal is injected between the first substrate 170 and the second substrate 180 and then sealed by a sealant (not shown) to form the liquid crystal layer 108. In this case, after the liquid crystal is dropped onto the first substrate 170 or the second substrate 180 on which the sealant (not shown) is formed, the first substrate 170 and the second substrate ( The liquid crystal layer 108 may be formed by opposing and combining 180.

FIG. 15 is a plan view illustrating a failure occurring in the liquid crystal display panel illustrated in FIG. 8, and FIG. 16 is a cross-sectional view taken along the line VI-VI ′ of FIG. 15.                     

15 and 16, a particle 140 is disposed between the gate electrode 118b and the drain electrode 118c to short-circuit the gate electrode 118b and the drain electrode 118c. When the gate electrode 118b and the drain electrode 118c are short-circuited, the thin film transistor 119 malfunctions and the image quality of the liquid crystal display panel is degraded.

17 to 19 are plan views illustrating a method for removing defects of a liquid crystal display panel according to a second exemplary embodiment of the present invention.

Referring to FIG. 17, in order to block the data signal applied to the malfunctioning thin film transistor 119, a laser is irradiated to both sides of the gate line 118b ′ adjacent to the malfunctioning thin film transistor 119. Both sides of the gate line 118b 'adjacent to the malfunctioning thin film transistor 119 are opened. Open portions 142a and 142b of the gate line 118b 'are disposed on the left and right sides of the malfunctioning thin film transistor 119, respectively. Thus, the malfunctioning thin film transistor 119 is electrically insulated from the gate line 118b '.

Referring to FIG. 18, a portion of the repair patterns 130 adjacent to the malfunctioning thin film transistor 119 and the open gate line 118b 'overlaps with the repair patterns 130 and the storage. For the repair pattern for irradiating a laser to the overlapping portion of the capacitor line 122, the open gate line 118b 'electrically connected to the storage capacitor line 122 through the repair patterns 130 Contact holes 144a, 144b, 144c and 144d are formed.                     

Referring to FIG. 19, to prevent the common voltage from being applied to the open gate line 118b ', it is disposed on the opposite side of the malfunctioning thin film transistor 119 based on the repair patterns 130. In addition, both sides of the storage capacitor line 122 are opened by irradiating a laser to both sides of the storage capacitor line 122 electrically connected to the repair patterns 130. Open portions 146a and 146b of the storage capacitor line 122 are disposed at left and right sides of the contact holes 144b and 144c connecting the storage capacitor line 122 and the repair patterns 130.

Accordingly, the gate signal is applied to the open gate line 118b 'by bypassing the malfunctioning thin film transistor through the repair patterns 130 and the storage capacitor line 122. In the present embodiment, the gate signal is applied only at one side of the gate line 118b ', but the common voltage is applied at both sides of the storage capacitor line 122.

Therefore, even when the second substrate 180 includes the repair lines 130 and the number of the malfunctioning thin film transistors 119 is three or more, the malfunction can be prevented.

Example  3

20 is a plan view illustrating a liquid crystal display panel according to a third exemplary embodiment of the present invention, and FIG. 21 is a cross-sectional view taken along the line VII-VII ′ of FIG. 20. In the present embodiment, the rest of the components except for the color filter are the same as those of the second embodiment, and thus detailed descriptions thereof will be omitted.                     

20 and 21, the liquid crystal display panel includes a first substrate 170, a second substrate 180, and a liquid crystal layer 108.

The first substrate 170 includes an upper plate 100, a black matrix 102, a color filter 104b, and a common electrode 106.

The second substrate 180 may include a lower plate 120, a plurality of thin film transistors 119, a plurality of storage capacitors 123, a plurality of data lines 118a ', a plurality of gate lines 118b', and a plurality of substrates. The storage capacitor line 122, the gate insulating layer 126, the passivation layer 116, the organic layer 114, the plurality of pixel electrodes 112, and the plurality of repair patterns 130 are included.

Therefore, even when the first substrate 170 includes the color filter 104b, a malfunction of the thin film transistor 119 may be prevented by using the repair pattern.

According to the present invention as described above, the display panel includes a bypass circuit pattern to prevent malfunction of the thin film transistor. In addition, even when the display panel includes a repair pattern and a plurality of thin film transistors malfunction, the malfunction of the plurality of thin film transistors can be prevented. In addition, the image quality of the display panel is improved by preventing malfunction of the thin film transistors.

In addition, the display panel can be easily repaired, thereby reducing manufacturing and repair costs and improving yield.                     

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (17)

plate; A gate line disposed on the plate and electrically connected to the gate electrode of the switching element; A storage capacitor line disposed on the plate; An insulating layer disposed on the gate line and the capacitor line; A pixel electrode on the insulating layer, electrically connected to the drain electrode of the switching element, and overlapping a portion of the storage capacitor line; And And a repair pattern disposed on the insulating layer and overlapping a portion of the gate line and a portion of the storage capacitor line. The display panel substrate of claim 1, wherein the repair pattern is electrically insulated from the gate line and the storage capacitor line. The display panel of claim 1, wherein the display panel substrate further comprises a data line electrically connected to a source electrode of the switching element, and the repair pattern is disposed on the same layer as the data line. Board. The display panel substrate of claim 1, wherein the pixel electrode comprises a transparent electrode having a transparent conductive material. The display panel substrate of claim 1, wherein the pixel electrode comprises a reflective electrode having a material having a high reflectance. The display panel substrate of claim 1, wherein the pixel electrode comprises a transparent electrode having a transparent conductive material and a reflective electrode disposed on the transparent electrode and having a material having a high reflectance. The display panel substrate of claim 1, further comprising an organic layer disposed between the insulating layer on which the repair pattern is formed and the pixel electrode to planarize a surface of the display panel substrate. The display panel substrate of claim 1, further comprising a color filter disposed between the insulating layer on which the repair pattern is formed and the pixel electrode to transmit light having a predetermined wavelength. The display panel substrate of claim 8, further comprising an organic layer disposed between the color filter and the pixel electrode to planarize the surface of the display panel substrate. A first substrate including an upper plate and a common electrode disposed on the upper plate; A lower plate, a gate line disposed on the lower plate and electrically connected to a gate electrode of a switching element, a storage capacitor line disposed on the lower plate, an insulating layer disposed on the gate line and the capacitor line; A pixel electrode disposed on the insulating layer, electrically connected to a drain electrode of the switching element, and overlapping a portion of the storage capacitor line; a pixel electrode disposed on the insulating layer, the portion of the gate line and the storage capacitor line. A second substrate including a repair pattern overlapping a portion of the second substrate; And And a liquid crystal layer disposed between the common electrode and the pixel electrode. The liquid crystal display panel of claim 10, wherein the second substrate further comprises a color filter disposed between the insulating film on which the repair pattern is formed and the pixel electrode to transmit light having a predetermined wavelength. The liquid crystal display panel of claim 11, further comprising an organic layer disposed between the color filter and the pixel electrode to planarize the surface of the second substrate. The liquid crystal display panel of claim 10, wherein the first substrate further comprises a color filter disposed between the upper plate and the common electrode to transmit light having a predetermined wavelength. The liquid crystal display device of claim 13, further comprising an organic layer disposed between the insulating layer on which the repair pattern is formed and the pixel electrode to planarize the surface of the second substrate. Electrically insulating the thin film transistor from the gate line by opening both sides of a gate line adjacent to a malfunctioning thin film transistor; Electrically connecting repair patterns arranged adjacent to the thin film transistor with the gate lines and the storage capacitor lines spaced apart from the gate lines; And And opening both sides of a storage capacitor line disposed on the opposite side of the thin film transistor based on the repair patterns. 16. The method of claim 15, wherein opening both sides of the gate line comprises irradiating a laser to both sides of the gate line, and opening both sides of the storage capacitor line comprises lasering both sides of the storage capacitor line. And removing the defect from the display panel. The method of claim 15, wherein both ends of the repair patterns overlap with the gate line and the storage capacitor line, and the connecting of the repair patterns forms contact hole for the repair pattern by irradiating a laser to the overlapping portions. And removing the defects of the display panel.

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