TWI410704B - Method of repairing pixel structure of display panel and the related display panel - Google Patents

Abstract

The present invention provides a method of repairing a pixel structure of a display panel and the repaired display panel. First, a first substrate defining a pixel region is provided. A pixel electrode overlaps a common electrode, and therefore an overlapping area is defined near a drain electrode. Subsequently, a second substrate and a liquid crystal material are provided with the first substrate to form a display panel. Afterwards, a laser repairing process is performed on the pixel region. The laser track of the laser repairing process penetrates both the overlapping area and the drain electrode to connect the pixel electrode with the common electrode, and to cut off the drain electrode. Thus, the repairing procedure can be simplified.

Description

Method for repairing display panel pixel structure and display panel thereof

The present invention relates to a method for repairing a pixel structure of a display panel and a display panel thereof, and more particularly to a pixel structure after laser repair and a repair method thereof.

The liquid crystal display device has advantages that cannot be achieved by a display device manufactured by a conventional cathode ray tube (CRT) having low voltage operation, no radiation scattering, light weight, and small volume, and other flat panel display devices such as electricity Plasma display devices and electro-luminescence display devices have become the main research topics of display devices in recent years, and are regarded as the mainstream of display device development.

The liquid crystal display panel is mainly composed of a thin film transistor array substrate, a color filter substrate, a liquid crystal layer and an associated driving circuit, wherein the thin film transistor array substrate is composed of a plurality of pixel structures arranged in an array. After the liquid crystal display panel is assembled, the liquid crystal display panel, the optical film and the backlight module are combined by a frame to form a liquid crystal display device capable of displaying a screen. Thereafter, the formed liquid crystal display device can be tested to confirm whether or not the screen of the liquid crystal display device has a bright spot of display failure.

FIG. 1 is a schematic top view of a pixel structure after a conventional repair of a bright spot. The conventional pixel structure 50 includes a lower substrate 10, a scan line 12, a common electrode 14, and a channel layer 16, The data line 18, the drain electrode 20 and the pixel electrode 28.

The scan line 12 and the common electrode 14 are both formed by the first conductive layer and disposed on the lower substrate 10. Each of the scan lines 12 and the common electrode 14 may extend laterally across a plurality of sub-pixel regions (not labeled). Each of the scan lines 12 has a plurality of gate electrode (not labeled) portions corresponding to the respective pixel regions. The common electrode 14 is disposed corresponding to three sides of each pixel region, and is not connected or crossed across the scan line 12. The scan line 12 and the common electrode 14 may be covered with a gate insulating layer (not shown), and the channel layer 16 is disposed above the gate insulating layer, corresponding to each gate electrode portion of the scan line 12. The data line 18 and the drain electrode 20 are both formed by a second conductive layer disposed on the scan line 12, the common electrode 14 and the channel layer 16. The data line 18 can extend longitudinally across the scan line 12. Each data line 18 has a plurality of source electrode (not labeled) portions, and both the source electrode portion and the drain electrode 20 contact the channel layer 16 to form a thin film transistor structure. The channel layer 16, the data line 18 and the drain electrode 20 may be covered with a protective layer having contact holes 26. A contact hole 26 is provided in each pixel region for exposing the drain electrode 20. The pixel electrode 28 is formed of a transparent conductive layer, and is connected to the drain electrode 20 through the contact hole 26, and is matched with the common electrode layer (not shown) of the upper substrate to control the liquid crystal material. In addition, the pixel electrode 28 will partially overlap the scan line 12 for subsequent possible bright spot repair steps for fusion.

When the thin film transistor in FIG. 1 fails to generate a bright spot, the process of performing the bright spot repair must first remove the frame (not shown) of the liquid crystal display device and the backlight module (not The liquid crystal display panel is turned over and repaired from the side of the lower substrate 10. As shown in FIG. 1, first, the first electrode is used to blow the drain electrode 20 through the lower substrate 10 to form a laser cutting track 24, so that the pixel electrode 28 is no longer electrically connected to the channel layer 16; The second laser passes through the lower substrate 10 to heat the overlap between the pixel electrode 28 and the scanning line 12, so that the pixel electrode 28 and the scanning line 12 are fused to each other to form a fusion zone 22 to achieve electrical connection. The overlap of the pixel electrode 28 and the scan line 12 is the drain 26 of the thin film transistor adjacent to the next pixel structure 50, and away from the drain 26 of the thin film transistor of the pixel structure 50. The repaired pixel structure 50 will no longer have the effect of brightness adjustment, but will continue to appear as a dark spot. Thereafter, the liquid crystal display panel, the optical film, and the backlight module are combined by using a frame to form a liquid crystal display device.

It can be seen that the process of repairing the spot highlights is too complicated, and the disassembly and reassembly of the liquid crystal display device consumes considerable time and cost. How to simplify the process of highlight repair is still one of the topics in the field of display devices.

The object of the present invention is to provide a pixel structure and a repairing method thereof, which can effectively simplify the process of bright spot repair and reduce the cost and time of highlight repair.

The present invention provides a method of repairing the pixel structure of a display panel. First, a first substrate is provided. A pixel area is defined on the first substrate, and the pixel area includes a common Electrode, drain electrode and pixel electrode. Wherein, the pixel electrode and the common electrode are electrically insulated from each other, and the overlapping portion of the pixel electrode and the common electrode forms an overlapping region. Thereafter, a second substrate corresponding to the first substrate is provided, and the second substrate defines an area corresponding to the pixel area. Next, a liquid crystal material is disposed between the first substrate and the second substrate to form a display panel. Then, a laser repair process is performed on the pixel area. The laser trajectory of the laser repair process passes through the overlapping region and the drain electrode to connect the pixel electrode and the common electrode, and cuts the drain electrode, so that the first electrode and the first electrode are electrically insulated from each other. Two parts.

The present invention further provides a display panel comprising: a first substrate, a second substrate disposed corresponding to the first substrate, and a liquid crystal material disposed between the first substrate and the second substrate. a pixel region is defined on the first substrate, and the first substrate includes: a common electrode, a dielectric layer disposed above the common electrode, a pixel electrode disposed above the dielectric layer, and a pixel disposed on the pixel region a drain electrode between the dielectric layer and the pixel electrode. The dielectric layer has a laser opening and the laser opening can extend through the dielectric layer. The pixel electrode partially overlaps the common electrode to define an overlap region, and the pixel electrode and the common electrode are connected to each other through the laser opening in the overlap region. The drain electrode includes a first portion and a second portion. The first portion is adjacent to the overlapping region and is electrically connected to the pixel electrode. The second portion is adjacent to the first portion and the overlap region. Wherein the laser opening further comprises being disposed between the first portion and the second portion to electrically insulate the first portion from the second portion. The second substrate defines an area corresponding to the pixel area, and the liquid crystal material, the first substrate and the second substrate can form a display surface board.

In a preferred embodiment of the invention, the overlap between the overlap region and the drain electrode is substantially less than or equal to 10 microns. In another preferred embodiment of the present invention, the laser system of the laser repair process is performed by penetrating the first substrate.

The invention adopts a structure in which a pixel electrode and a common electrode form an overlapping region, and the overlapping region is adjacent to the drain electrode, so that one laser trajectory of the laser repairing process can pass through the overlapping region and the drain electrode to connect the pixels. The electrode and the common electrode are cut off, and the drain electrode is cut off to complete the process of bright spot repair.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

The method for repairing the pixel structure of the display panel and the display panel thereof according to the present invention are described in detail in conjunction with the drawings, but the embodiments are not intended to limit the scope of the present invention, and the method flow. The description of the steps is not intended to limit the order in which they are performed, and any method of re-combining the method steps to produce equal-efficiency is the scope of the present invention. The drawings are for illustrative purposes only and are not drawn to the original dimensions.

Please refer to FIG. 2 to FIG. 6 . FIG. 2 to FIG. 6 are schematic diagrams showing a method for repairing a pixel structure of a display panel according to a preferred embodiment of the present invention, and also a schematic structural view of the display panel. 3 and FIG. 4 only show one pixel area as a representation, but the actual structure is not limited thereto. Figure 5 is a cross-sectional view of Figure 4 taken along the laser trace 124 prior to repair, and Figure 6 is a cross-sectional view of Figure 4 taken along section line A-A' and section line B-B' after repair. The same elements or parts in the drawings are denoted by the same symbols. In order to clearly show the layout structure of the present invention, FIG. 4 is illustrated in a perspective manner, but in practice the material layers of the pixel structure are not limited to transparent materials. In the present embodiment, the method of repairing the pixel structure of the display panel can be performed through the color filter substrate without disassembling the display device, but the invention is not limited thereto.

As shown in FIG. 2, a thin film transistor array substrate 162, a color filter substrate 164, and a liquid crystal material 166 are first provided. The color filter substrate 164 is disposed corresponding to the thin film transistor array substrate 162, and the liquid crystal material 166 is disposed between the thin film transistor array substrate 162 and the color filter substrate 164, and then the polarizer 168 is attached to the thin film electricity. The surface of the crystal array substrate 162 and the color filter substrate 164 is formed to form the display panel 170. One or a plurality of pixel regions may be defined in the display panel 170, and one or a plurality of sub-pixel regions may be further defined in each pixel region. After the display panel 170 is formed, the display panel 170, the backlight module 172, and the optical film 174 are combined with the frame 178 to form a liquid crystal display device 160 that can display a screen. The backlight module 172 is disposed under the display panel 170 adjacent to one side of the thin film transistor array substrate 162. The optical film 174 is disposed on the backlight module 172 Between the display panel 170 and the display panel 170, for example, a light-increasing sheet or a diffusion sheet may be included, but is not limited thereto. The frame 176 and the frame 178 can be two parts, a front frame and a rear frame, respectively, for accommodating the display panel 170. More specifically, the frame 176 and the frame 178 can fix the display panel 170, the backlight module 172, and the optical film 174 therein, and the frame 176 can have an opening to expose the display area of the display panel 170.

Thereafter, the formed liquid crystal display device 160 can be tested to confirm whether or not the screen of the liquid crystal display device 160 has a bright spot of display failure. When the liquid crystal display device 160 generates a defective bright spot, the laser device 182 can be directly supplied from one side of the color filter substrate 164 by the laser device, that is, directly through the color filter substrate 164 for bright spot repair.

As shown in FIG. 3, the color filter substrate 164 has a black matrix 184 in a plan view to define an area corresponding to the pixel region 100. The black matrix 184 may expose the display area 180 of each pixel structure and mask portions outside the display area 180 to avoid side leakage. That is, the area defined by the black matrix 184 can be correlated to the predetermined position of the laser 182, so that the laser 182 can be accurately repaired through the color filter substrate 164 to form a laser cutting trajectory 124. .

As shown in FIG. 4 and FIG. 5, corresponding to the display region 180 of the color filter substrate 164, a pixel region 100 may be defined on the thin film transistor array substrate 162, and the pixel is The region 100 includes a scan line 112, a common electrode 114, a gate insulating layer 132, a channel layer 116, a data line 118, a gate electrode 120, a protective layer 134, and a pixel electrode 128. The scan line 112 and the common electrode 114 are both formed by the first conductive layer and disposed on the lower substrate 110. Each of the scan lines 112 and the common electrode 114 may extend laterally across the plurality of pixel regions 100. The scan line 112 has a plurality of gate electrode (not labeled) portions corresponding to the respective pixel regions 100.

The common electrode 114 is disposed on three sides of each pixel region 100 to be U-shaped, and is not connected or crossed across the scan line 112. The gate line 112 and the common electrode 114 can completely cover the gate insulating layer 132, and the channel layer 116 is disposed above the gate insulating layer 132, corresponding to each gate electrode portion of the scan line 112. In addition, the channel layer 116 may also be disposed above the portion of the common electrode 114 and other portions of the scan line 112 for use as a dielectric layer of the capacitor structure.

The data line 118 and the drain electrode 120 are both formed by the second conductive layer and disposed on the scan line 112, the common electrode 114 and the channel layer 116. The data line 118 can extend longitudinally across the scan line 112. Each data line 118 has a plurality of source (not labeled) electrode portions, and the source electrode portion and the drain electrode 120 both contact the channel layer 116 to form a thin film transistor structure. The channel layer 116, the data line 118 and the drain electrode 120 may be covered with a protective layer 134 having a contact hole 126. Each of the pixel regions 100 is provided with a contact hole 126 for exposing the drain electrode 120.

The pixel electrode 128 is formed by a conductive layer, such as a transparent conductive layer or other suitable material, and is connected to the drain electrode 120 through the contact hole 126, and is matched with the common electrode layer (not shown) of the color filter substrate 164. The liquid crystal material 166 is controlled. The pixel electrode 128 and the common electrode 114 may be electrically insulated from each other by the gate insulating layer 132 and the protective layer 134 before the bright spot repairing step. In the present invention, the pixel electrode 128 and the common electrode 114 partially overlap, and the overlapping portions thereof form an overlap region 186. In order to achieve better results in the laser trimming process, the overlap region 186 is preferably adjacent to the drain electrode 120. Taking the 8.4-inch panel process as an example, the distance between the overlap region 186 and the drain electrode 120 of the present invention is preferably less than or equal to 10 micrometers, more preferably about 5 micrometers.

When the laser repair process is performed on the pixel region 100, the laser trace 124 of the laser repair process passes through the overlap region 186 and the drain electrode 120. More specifically, this embodiment utilizes only one continuous laser trajectory 124 to pass the overlap region 186 and the drain electrode 120.

As shown in FIG. 6, the laser trajectory 124 of the overlap region 186 can connect the pixel electrode 128 and the common electrode 114, and the laser trajectory 124 of the drain electrode 120 can cut the gate electrode 120 to make the drain electrode 120 The first portion 120a and the second portion 120b electrically insulated from each other are formed to complete the bright spot repairing step.

According to the research of the present invention, the present invention can quickly and surely complete the stream of bright spot repair The process of disassembling the frame 176 is not required, and the display panel 170, the optical film 174, and the backlight module 172 are not required to be reused. The invention can directly repair the formed display device 160, has the advantages of simple process, fast and effective, and can greatly reduce the time and cost of the repair process.

According to the display panel and the repairing method of the present invention, the present invention does not need to be limited to the repair process after the assembly of the frame, nor is it limited to penetrating the color filter substrate for the repair process. Please refer to FIG. 7. FIG. 7 is a schematic diagram of a method for repairing a pixel structure of a display panel according to another embodiment of the present invention. The present embodiment can have the same display panel 170 as the previous embodiment. Similarly, the laser trajectory 124 can be used to complete the bright spot repairing step through the overlap region 186 and the drain electrode 120, and the similarities are not described herein.

As shown in FIG. 7, one of the main differences between the present embodiment and the foregoing embodiment is that the present embodiment can perform a repair process before assembling the frame. After forming the display panel 170, the present invention may first perform a cell test on the display panel 170, for example, with an external light source to test whether the structure of the display panel 170 is normal. If the existence of a defective bright spot is found before the assembly of the frame, the present invention can also directly perform the display panel 170 by using the aforementioned repairing method. At this time, since the display panel 170 is not yet accommodated in the frame, the laser 182 can be directly supplied from one side of the color filter substrate 164 by the laser device, that is, directly through the color filter substrate 164 for bright spot repair. Alternatively, the laser 182 may be provided from one side of the thin film transistor array substrate 162, that is, directly through the thin film transistor array substrate 162 for bright spot repair. or The laser device can provide the laser 182 from one side of the color filter substrate 164 and from one side of the thin film transistor array substrate 162 at the same time.

On the other hand, the display device structure and the pixel structure of the present invention need not be limited by the foregoing embodiments. For example, in other embodiments, the scan line, the common electrode, the gate insulating layer, the channel layer, and the data of the pixel structure. The shape or position of the wire, the drain electrode, the protective layer and the pixel electrode can be adjusted depending on the product requirements or process conditions. Please refer to FIG. 8. FIG. 8 is a schematic diagram of a method for repairing a pixel structure of a display panel according to still another preferred embodiment of the present invention. As shown in FIG. 8, a pixel region 200 may be defined on the lower substrate 210 of the thin film transistor array substrate, and the pixel region 200 includes a scan line 212, a common electrode 214, a channel layer 216, a data line 218, and a drain electrode. 220, contact hole 226 and pixel electrode 228.

One of the main differences between the present embodiment and the foregoing embodiment is that the common electrode 214 of the present embodiment can be surrounded by the pixel region 200 to exhibit a ring shape. Due to the shape adjustment of the common electrode 214, the shape of the display area 280 and the black matrix (not shown) also changes. The area defined by the black matrix can still correspond to the predetermined position of the laser cutting track 224. Therefore, the repairing of the embodiment can also provide a lightning from one side of the thin film transistor array substrate or the color filter substrate. Shoot.

Furthermore, the liquid crystal material in the above embodiments may also be replaced by a liquid display medium material such as an electrophoretic material, an electrowetting material, or other suitable materials. or Other solid materials, such as self-luminous materials. At this time, the pixel structure can be changed from a bright point to a dark point by the above-mentioned repairing method, and the pixel structure can be repaired.

In summary, the present invention has the following advantages by using a structure in which a pixel electrode and a common electrode form an overlapping region, and the overlapping region is adjacent to the drain electrode, thereby having the following advantages:

(1) Since the present invention can use only one laser trajectory to pass through the overlap region and the drain electrode, the pixel electrode and the common electrode can be connected, and the drain electrode can be cut off, so that the step of dividing the drain electrode is not required separately. And the welding step of the pixel electrode and the scanning line, thereby effectively simplifying the repairing step.

(2) Since the present invention can complete the dividing step and the soldering step around the display area of the pixel and at the position beside the thin film transistor, the display device can be provided with lightning from one side of the color filter substrate. Shooting, precise repair, no need to remove the frame, no need to reuse the frame combination display device, greatly reducing the time and cost of the repair process.

While the present invention has been described in its preferred embodiments, the present invention is not intended to limit the invention, and the present invention may be modified and modified without departing from the spirit and scope of the invention. The scope of protection is subject to the definition of the scope of the patent application.

10, 110, 210‧‧‧ lower substrate

12, 112, 212‧‧‧ scan lines

14, 114, 214‧‧ ‧ common electrode

16, 116, 216‧‧‧ channel layer

18, 118, 218‧‧‧ data lines

20, 120, 220‧‧‧汲electrode

22‧‧‧welding area

24, 124, 224‧‧ ‧ laser cutting trajectory

26, 126‧‧‧ contact holes

28, 128, 228‧‧ ‧ pixel electrodes

50‧‧‧ pixel structure

100, 200‧‧‧ pixel area

120a‧‧‧Part 1

120b‧‧‧Part II

132‧‧‧ gate insulation

134‧‧‧Protective layer

160‧‧‧Liquid crystal display device

162‧‧‧Film transistor array substrate

164‧‧‧Color filter substrate

166‧‧‧Liquid crystal materials

168‧‧‧ polarizer

170‧‧‧ display panel

172‧‧‧Backlight module

174‧‧‧Optical diaphragm

176, 178‧‧‧ framework

180, 280‧‧‧ display area

182‧‧ ‧ laser

184‧‧‧Black matrix

186‧‧‧ overlapping areas

FIG. 1 is a schematic top view of a pixel structure after a conventional patching of bright spots.

2 to FIG. 6 are schematic diagrams showing a method for repairing a pixel structure of a display panel according to a preferred embodiment of the present invention.

FIG. 7 is a schematic diagram of a method for repairing a pixel structure of a display panel according to another preferred embodiment of the present invention.

FIG. 8 is a schematic diagram of a method for repairing a pixel structure of a display panel according to still another preferred embodiment of the present invention.

110‧‧‧lower substrate

112‧‧‧ scan line

114‧‧‧Common electrode

116‧‧‧Channel layer

118‧‧‧Information line

120‧‧‧汲electrode

124‧‧‧Laser cutting track

126‧‧‧Contact hole

128‧‧‧ pixel electrodes

100‧‧‧ pixel area

120a‧‧‧Part 1

120b‧‧‧Part II

180‧‧‧Display area

182‧‧ ‧ laser

186‧‧‧ overlapping areas

Claims (15)

A method for repairing a pixel structure of a display panel, comprising: providing a first substrate, wherein a pixel region is defined on the first substrate, and the pixel region includes a common electrode, a drain electrode and a pixel electrode, wherein The pixel electrode and the common electrode are electrically insulated from each other, and an overlapping portion of the pixel electrode and the common electrode forms an overlapping region; a second substrate corresponding to the first substrate is provided, and the The two substrates are defined with an area corresponding to the pixel area; a liquid crystal material is disposed between the first substrate and the second substrate to form a display panel; and a laser repair process is performed on the pixel area a laser trajectory of the laser repair process passing through the overlap region and the drain electrode to connect the pixel electrode and the common electrode, and cutting the drain electrode to cause the 汲The pole electrodes form a first portion and a second portion that are electrically insulated from each other. The method of claim 1, wherein the overlap region and the drain electrode have a distance of less than or equal to 10 micrometers. The method of claim 1, wherein the common electrode is disposed on three sides of the pixel region to assume a U shape. The method of claim 1, wherein the common electrode is in a ring shape around the pixel region. The method of claim 1, wherein the laser of the laser repair process penetrates the second substrate to reach the first substrate. The method of claim 1, wherein the laser of the laser repair process penetrates the first substrate. The method of claim 1, further comprising: providing a frame and accommodating the display panel with the frame before the laser repair process. The method of claim 1, further comprising: providing a frame with which the display panel is housed after the laser repair process. The method of claim 1, wherein the overlap region is adjacent to the drain electrode. A display panel includes: a first substrate on which a pixel region is defined, and the first substrate includes: a common electrode in the pixel region; a dielectric layer disposed on the common electrode Above, the dielectric layer has a laser opening, and the laser opening penetrates through the dielectric layer; a pixel electrode is disposed above the dielectric layer, wherein the pixel electrode and the common electrode portion Overlapping to define an overlap region, and the pixel electrode and the common electrode are connected to each other through the laser opening in the overlap region; a drain electrode disposed above the dielectric layer and located in a pixel Below the electrode, the drain electrode comprises: a first portion adjacent to the overlapping region electrically connected to the pixel electrode; and a second portion adjacent to the first portion and the overlapping region, wherein the laser opening further comprises a first portion disposed Between the second portion and the second portion, the first portion and the second portion are electrically insulated from each other; a second substrate disposed corresponding to the first substrate, and the second substrate is defined corresponding to An area of the pixel region; and a liquid crystal material disposed between the first substrate and the second substrate to form a display panel. The display panel of claim 10, wherein a distance between the overlapping region and the first portion is less than or equal to 10 micrometers, and a distance between the overlapping region and the second portion is less than or equal to 10 micrometers. The display panel of claim 10, wherein the common electrode is disposed on three sides of the pixel region to assume a U shape. The display panel of claim 10, wherein the common electrode is in a ring shape around the pixel region. The display panel of claim 10, further comprising a frame, wherein the frame houses the display panel. The method of claim 10, wherein the overlap region is adjacent to the drain electrode.