TWI395005B - Display panel and repairing method thereof - Google Patents

Description

Display panel and its repair method

The present invention relates to a display device and a repair method thereof, and more particularly to a display device having a repair line and a repair method therefor.

As far as the display is concerned, a thin film transistor liquid crystal display (TFT-LCD) having high image quality, good space utilization efficiency, low power consumption, and no radiation is gradually becoming the mainstream of the market.

Generally, a thin film transistor liquid crystal display is mainly composed of a thin film transistor array substrate, a pair of substrates, and a liquid crystal layer sandwiched between the opposite substrates, wherein the thin film transistor array substrate can be divided into display regions ( Display region) and a non-display region, wherein a plurality of pixel units arranged in an array are arranged on the display area, and each pixel unit includes a thin film transistor and a pixel connected to the thin film transistor Pixel electrode. In addition, a plurality of scan lines and data lines are arranged in the display area, wherein the thin film transistors of each pixel unit are controlled by corresponding scan lines and data lines. a signal line, a source driving circuit and a gate driving circuit are disposed in the non-display area, wherein the signal line is disposed in a corner area of the non-display area and is located between the source driving circuit and the gate driving circuit for transmitting the signal Between the source drive circuit and the gate drive circuit.

Since the signal line is located at the periphery of the thin film transistor array substrate, that is, it is located in the non-display area, the film transistor array substrate is often not cornered or fragmented due to improper pick-and-place operation and wrong operation of the device or personnel, thereby causing the non-display area to be located in the non-display area. The signal line in the corner area of the display area has a broken line and must be discarded after being repaired.

The invention provides a display panel with a repairing line, which can retain the possibility of repairing, so as to effectively reduce the amount of scrapping of the display panel due to breakage of the signal line.

The present invention provides a method for repairing a display panel, which repairs a broken wire at a signal line by electrically connecting a repair wire to a signal wire and a pin of the flexible circuit board.

The present invention provides a display panel having a display area and a non-display area surrounding one of the display areas, and the non-display area located around the display area has four corner areas. The display panel includes a pixel array, a first driving circuit, a second driving circuit, a plurality of signal lines, a plurality of first repair lines, and a plurality of second repair lines. The pixel array is located in the display area. The first driving circuit is located in a non-display area on one side of the display area. The second drive circuit is located in the non-display area on the other side of the display area. The signal line is located in the non-display area. The signal line is disposed in the at least one corner region and is located between the first driving circuit and the second driving circuit. The first repairing line and the second repairing line are respectively located at two ends of the signal line in the corner area, wherein the first and second repairing lines are electrically insulated from the signal line, and each of the first and second repairing lines and the signal line respectively There is an overlapping area.

In an embodiment of the invention, the display panel further includes a plurality of transparent conductive patterns covering and electrically connecting the first repairing line and the second repairing line.

In an embodiment of the invention, the material of the transparent conductive pattern comprises indium tin oxide.

In an embodiment of the invention, the first driving circuit is a source driving circuit, and the second driving circuit is a gate driving circuit.

The invention provides a repair method for a display panel. First, a display panel is provided, which is the display panel as described above, wherein the display panel has a broken line at the signal line of the corner area. Then, a welding step is performed at the overlapping area to electrically connect each of the signal lines with the corresponding first and second repairing lines. Perform a disconnection procedure to cut off the signal line at the break. Provide a flexible circuit board. The flexible circuit board has a plurality of pins at each end. Then, the pins of the two ends of the flexible circuit board are respectively disposed on the first repairing line and the second repairing line, so that each pin of one end of the flexible circuit board is electrically connected to one of the first repairing lines, and Each pin of the other end of the flexible circuit board is electrically connected to one of the second repair lines.

In an embodiment of the invention, the method for repairing the display panel further includes placing an anisotropic conductive paste between the pins of the flexible circuit board and the first repairing line and the second repairing line. Performing a bonding step to electrically connect each pin of one end of the flexible circuit board with one of the first repair lines through the anisotropic conductive paste, and to make each pin of the other end of the flexible circuit board A second repair line is electrically connected through the anisotropic conductive paste.

In an embodiment of the invention, the first repairing line and the second repairing line further comprise a plurality of transparent conductive patterns, and the transparent conductive patterns are electrically connected to the pins.

In an embodiment of the invention, the material of the transparent conductive pattern comprises indium tin oxide.

In an embodiment of the invention, the fusing step includes a laser fusing.

In one embodiment of the invention, the cutting process described above includes a laser cut.

The present invention further provides a display panel having a display area and a non-display area surrounding one of the display areas, and the non-display area around the display area has four corner areas. The display panel includes a pixel array, at least one first driving circuit, at least one second driving circuit, a plurality of signal lines, and four sets of corner repairing lines. The pixel array is located in the display area. The first driving circuit is located in a non-display area on one side of the display area. The second drive circuit is located in the non-display area on the other side of the display area. The signal line is located in the non-display area. The signal line passes through the four corner areas. Each set of corner repairing lines includes a plurality of first repairing lines and a plurality of second repairing lines respectively located at two ends of the signal lines of the corresponding corner regions, wherein the first and second repairing lines are electrically insulated from the signal lines. And each of the first and second repair lines has an overlapping area with the signal line.

In an embodiment of the invention, the display panel further includes a plurality of transparent conductive patterns covering and electrically connecting the first repairing line and the second repairing line.

In an embodiment of the invention, the material of the transparent conductive pattern comprises indium tin oxide.

In an embodiment of the invention, the first driving circuit is a source driving circuit, and the second driving circuit is a gate driving circuit.

Based on the above, since the display panel of the present invention has a repairing line, when the display panel is broken due to equipment or human error, the signal line located in the corner area of the non-display area may be broken through the repair line and the signal line. After the connection, the signal line at the disconnection port is cut off, and then the repair line is electrically connected to the pin of the flexible circuit board, and the signal line with the broken line is repaired. Therefore, compared with the prior art, the design of the display panel of the present invention can retain the possibility of repairing, so as to effectively reduce the amount of scrapping of the display panel due to breakage at the signal line.

The above described features and advantages of the present invention will be more apparent from the following description.

1A is a schematic view of a display panel according to an embodiment of the present invention, and FIG. 1B is an enlarged schematic view of a region “P1” of FIG. 1A. Referring to FIG. 1A and FIG. 1B simultaneously, in the embodiment, the display panel 100 has a display area 100a and a non-display area 100b surrounding the display area 100a, and the non-display area 100b located around the display area 100a has four. Corner areas C1, C2, C3, C4.

The display panel 100 is, for example, a medium and small size display panel, and includes a pixel array 110, a first driving circuit 120, a second driving circuit 130, a plurality of signal lines 140, and a plurality of first repairing lines 150. A plurality of second repair lines 160. In the present embodiment, the pixel array 110 is located in the display area 100a, and the pixel array 110 is composed of, for example, a plurality of pixel units 110a, wherein each pixel unit 110a includes a thin film transistor 20 and a pixel. The electrode 30, the thin film transistor 20 has a gate G, a source S, and a drain D, and the pixel electrode P is disposed on a portion of the drain D, and the pixel electrode P is directly in contact with the drain D.

The first driving circuit 120 is located in the non-display area 100b on the side of the display area 100a, and the second driving circuit 130 is located in the non-display area 100b on the other side of the display area 100a. In this embodiment, the first driving circuit 120 and the second driving circuit 130 are respectively connected to the non-display area 100b of the display panel 100 by a plurality of package structures 122, wherein each package structure 122 is automatically bonded through the tape. The Tape Automated Bonding (TAB) technology or the Chip-on-Chip (COF) bonding technique is configured by disposing a driving wafer 122a on a flexible carrier 122b. The first driving circuit 120 is, for example, a source driving circuit, and the second driving circuit 130 is, for example, a gate driving circuit.

These signal lines 140 are located in the non-display area 100b. In detail, the signal lines 140 are disposed in the corner area C1 and are located between the first driving circuit 120 and the second driving circuit 130 for transmitting signals between the first driving circuit 120 and the second driving circuit 130. . In other words, the signal lines 140 are the transmission paths of the first driving circuit 120 and the second driving circuit 130. In the present embodiment, only four signal lines 140 are schematically illustrated as an example, but are not limited thereto.

The first repairing lines 150 and the second repairing lines 160 are located at the two ends of the signal lines 140 of the corner area C1, wherein the first repairing lines 150 and the second repairing lines 160 are electrically insulated from the signal lines 140, respectively. Each of the first repairing lines 150 and each of the second repairing lines 160 has an overlapping area R with the signal lines 160. That is, each of the first repair lines 150 and each of the second repair lines 160 are perpendicular to the signal lines 140 and have an overlap region R. The arrangement of the first repairing line 150 and the signal line 140 is the same as that of the second repairing line 160 and the signal line 140. Therefore, only the configuration relationship between the first repairing line 150 and the signal line 140 is schematically illustrated in FIG. 1B. As an example.

Fig. 1C is a schematic cross-sectional view taken along line I-I' of Fig. 1B. Referring to FIG. 1C , in the embodiment, the display panel 100 further includes a plurality of transparent conductive patterns 170 , wherein the transparent conductive patterns 170 respectively cover the first repair lines 150 and a portion of the substrate 10 therebelow and the second repair lines 160 . The first repairing lines 150 and the second repairing lines 160 are electrically connected to a portion of the substrate 10 below it. In other words, each of the first repair lines 150 and each of the second repair lines 160 are each covered with a transparent conductive pattern 170. When the signal line 140 has a broken line and needs to be repaired, the transparent conductive patterns 170 can be used to increase the contact area between the first repair lines 150 and the second repair lines 160 and the external lines, thereby effectively reducing the impedance. In addition, the material of the transparent conductive pattern 170 includes a metal oxide such as indium tin oxide or indium zinc oxide.

In short, since the display panel 100 of the embodiment has the first repairing line 150 and the second repairing line 160 that intersect with the signal line 140, the first repairing line 150 is not broken when the signal line 140 is disconnected. The possibility of repairing the display panel 100 may be retained with the second repair line 160. In other words, when there is a disconnection at the signal line 140, the first repairing line 150 and the second repairing line 160 can be electrically connected to the external line, thereby effectively reducing the amount of the display panel 100 being scrapped due to the breakage of the signal line. Therefore, the design of the display panel 100 of the present embodiment can effectively reduce the number of unnecessary panel scraps compared to the prior art.

The design of other different types of display panels of the present invention will be exemplified below. 2 is a schematic diagram of a display panel according to another embodiment of the present invention. Referring to FIG. 2, the display panel 100' of FIG. 2 is similar to the display panel 100 of FIG. 1, except that in the embodiment, the display panel 100' is, for example, a large-sized display panel, which includes two The first driving circuit 120a, 120b, the two second driving circuits 130a, 130b, and the four sets of corner repairing lines CR, wherein each set of corner repairing lines CR includes a plurality of first repairing lines 150 and a plurality of second repairing lines 160 , respectively located at the two ends of the signal line 140 corresponding to the corner regions C1, C2, C3, C4. Since the display panel 100' has the first repairing line 150 and the second repairing line 160, in addition to the possibility of repairing the display panel 100', when the signal line 140 is broken due to equipment or human error, The first repairing line 150 and the second repairing line 160 can be electrically connected to the external line, thereby effectively reducing the amount of the display panel 100' being scrapped due to the breakage of the signal line.

Only the display panels 100, 100' of some embodiments of the present invention are described above, and the repair method of the display panel of the present invention is not described. In this regard, the repairing method of the display panel will be described below with reference to an embodiment, and the display panel 100 of FIG. 1A is taken as an example, and the repairing method of the display panel is described in detail with reference to FIG. 3 and FIG. 4A to FIG. 4B is an enlarged schematic view of the area "P1" of FIG. 4A, FIG. 4C is a schematic view of the display panel of FIG. 4A after being repaired, and FIG. 4D is an enlarged schematic view of the area "P2" of FIG. 4C. Fig. 4E is a schematic cross-sectional view taken along line II-II' of Fig. 4C. It should be noted that, since the first repairing line 150 and the signal line 140 are arranged in the same manner as the second repairing line 160 and the signal line 140, only the first embodiment is schematically illustrated in FIG. 4B and FIG. 4D. The configuration relationship between the repair line 150 and the signal line 140 is illustrated as an example.

3 is a flow chart of a method for repairing a display panel according to an embodiment of the present invention, and FIG. 4A is a schematic diagram of a display panel having a broken wire at a signal line according to an embodiment of the present invention. Referring to FIG. 3 and FIG. 4A simultaneously, according to the repairing method of the display panel of the embodiment, first, step S301 is to provide a display panel 100, wherein the display panel 100 has a broken line at the signal line 140 of the corner area C1.

Next, referring to FIG. 4B, step S302 is to perform a welding step at the overlapping region R, so that each signal line 140 is electrically connected to the corresponding first repairing line 150 and the second repairing line 160, wherein the welding step includes a Laser welding. In detail, each of the first repairing lines 150 and each of the second repairing lines 160 has an overlapping area R with the signal lines 160, so that the welding step can be selectively performed at an overlapping area R, that is, each A first repairing line 150 and each of the second repairing lines 160 and each of the signal lines 140 have only one overlapping region R for the welding step.

Next, in step S303, a disconnection procedure is performed to cut off the signal line 140 at the broken line, wherein the cutting procedure is, for example, a laser cut.

Next, please refer to FIG. 4C and FIG. 4D simultaneously. Step S304 is to provide a flexible circuit board 200, wherein each end of the flexible circuit board 200 has a plurality of pins 210. Then, the pins 210 of the two ends of the flexible circuit board 200 are respectively disposed on the first repairing line 150 and the second repairing line 160, so that each of the pins 210 at one end of the flexible circuit board 200 and one of the first patches are repaired. The wire 150 is electrically connected, and each pin 210 at the other end of the flexible circuit board 200 is electrically connected to one of the second repairing wires 160.

In detail, please refer to FIG. 4D and FIG. 4E simultaneously, before the pins 210 at both ends of the flexible circuit board 200 are respectively disposed on the first repairing line 150 and the second repairing line 160, and further included in the flexible circuit board 200. An anisotropic conductive paste 220 is placed between the pin 210 and the first repairing line 150 and the second repairing line 160. Thereafter, a bonding step is performed to electrically connect each of the pins 210 at one end of the flexible circuit board 200 with one of the first repair lines 150 through the anisotropic conductive paste 220, and the other end of the flexible circuit board 200 Each of the pins 210 and one of the second repairing lines 160 are electrically connected through the anisotropic conductive adhesive 220. It should be noted that the flexible circuit board 200 has a flexible film 212 for covering the pins 210 to protect the pins 210 from directly contacting the pins 210 with the outside.

In addition, a plurality of transparent conductive patterns 170 are further included on the first repairing line 150 and the second repairing line 160, wherein the transparent conductive patterns 170 respectively cover the first repairing lines 150 and a portion of the substrate 10 therebelow and the second repairing lines The first repair line 150 and the second repair line 160 and the pin 210 are electrically connected to the portion of the substrate 10 and the portion of the substrate 10 . When the signal line 140 has a broken line and needs to be repaired, the transparent conductive patterns 170 can be used to increase the contact area between the first repair lines 150 and the second repair lines 160 and the pins 210, thereby effectively reducing the impedance. The material of the transparent conductive pattern 170 includes indium tin oxide or indium zinc oxide.

In short, since the display panel 100 of the present embodiment has the first repairing line 150 and the second repairing line 160, the signal line 140 located in the corner area C1 of the non-display area 100b is caused by the device or human error. When there is a broken wire, the first repairing line 150 and the second repairing line 160 are first electrically connected to the signal line 140, and then the signal line 140 at the broken line is cut off, and then the flexible circuit board 200 is connected. The foot 210 is electrically connected to the first repairing line 150 and the second repairing line 160 through the anisotropic conductive adhesive 220, and the signal line 140 repaired with the broken wire is completed. Therefore, compared with the prior art, the design of the display panel 100 of the present embodiment can preserve the possibility of repair, and can effectively reduce the amount of the display panel 100 being scrapped due to breakage at the signal line 140.

In summary, the display panel of the present invention has a repairing line. Therefore, when the display panel is disconnected due to equipment or human error, the signal line located in the corner area of the non-display area can pass through the repairing line and the external line (softness). The board is electrically connected and repaired with a broken signal line. Therefore, compared with the prior art, the design of the display panel of the present invention can retain the possibility of repairing, and when the signal line has a broken line, the display panel can be effectively reduced due to the breakage of the signal line. quantity.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10. . . Substrate

20. . . Thin film transistor

30. . . Pixel electrode

100, 100’. . . Display panel

100a. . . Display area

100b. . . Non-display area

110. . . Pixel array

110a. . . Pixel unit

120, 120a, 120b. . . First drive circuit

122. . . Package structure

122a. . . Driver chip

122b. . . Soft carrier

130, 130a, 130b. . . Second drive circuit

140. . . Signal line

150. . . First repair line

160. . . Second repair line

170. . . Transparent conductive pattern

200. . . Flexible circuit board

210. . . Pin

212. . . Flexible film

220. . . Anisotropic conductive adhesive

C1～C4. . . Corner area

CR. . . Corner repair line

D. . . Bungee

S. . . Source

G. . . Gate

R. . . Overlapping area

S301~S305. . . step

P1, P2. . . region

FIG. 1A is a schematic diagram of a display panel according to an embodiment of the invention.

Fig. 1B is an enlarged schematic view of a region "P1" of Fig. 1A.

Fig. 1C is a schematic cross-sectional view taken along line I-I' of Fig. 1B.

2 is a schematic diagram of a display panel according to another embodiment of the present invention.

FIG. 3 is a flowchart of a method for repairing a display panel according to an embodiment of the present invention.

4A is a schematic diagram of a display panel having a broken wire at a signal line according to an embodiment of the present invention.

4B is an enlarged schematic view of a region "P1" of FIG. 4A.

4C is a schematic view of the display panel of FIG. 4A after being repaired.

4D is an enlarged schematic view of a region "P2" of FIG. 4C.

Fig. 4E is a schematic cross-sectional view taken along line II-II' of Fig. 4C.

20. . . Thin film transistor

30. . . Pixel electrode

100. . . Display panel

100a. . . Display area

100b. . . Non-display area

110. . . Pixel array

110a. . . Pixel unit

120. . . First drive circuit

122. . . Package structure

122a. . . Driver chip

122b. . . Soft carrier

130. . . Second drive circuit

140. . . Signal line

150. . . First repair line

160. . . Second repair line

C1～C4. . . Corner area

D. . . Bungee

S. . . Source

G. . . Gate

P1. . . region

Claims (14)

A display panel has a display area and a non-display area surrounding the display area, and the non-display area located around the display area has four corner areas, and the display panel comprises: a pixel array located in the display area a first driving circuit located in the non-display area on one side of the display area; a second driving circuit located in the non-display area on the other side of the display area; and a plurality of signal lines located in the non-display area The signal lines are disposed in the at least one of the corner regions and located between the first driving circuit and the second driving circuit, and each of the signal lines is electrically connected to the first driving circuit and the second driving circuit; And the plurality of first repairing lines and the plurality of second repairing lines are respectively located at the two ends of the signal lines of the corner area, wherein the first and second repairing lines are electrically insulated from the signal lines, and The first repairing lines are electrically insulated from the second repairing lines, and each of the first and second repairing lines has an overlapping area with the signal lines. The display panel of claim 1, further comprising a plurality of transparent conductive patterns covering and electrically connecting the first repair lines and the second repair lines. The display panel of claim 1, wherein the material of the transparent conductive patterns comprises indium tin oxide. The display panel of claim 1, wherein the A driving circuit is a source driving circuit, and the second driving circuit is a gate driving circuit. A method for repairing a display panel, comprising: providing a display panel, as described in claim 1, wherein the display panel has a broken line at the signal lines of the corner area; at the overlapping areas Performing a welding step to electrically connect each signal line to the corresponding first and second repairing lines; performing a disconnection process to cut off the signal lines at the broken line; providing a flexible circuit Each of the two ends of the flexible circuit board has a plurality of pins; and the pins of the two ends of the flexible circuit board are respectively disposed on the first repairing lines and the second repairing lines, so that the Each of the pins of one end of the flexible circuit board is electrically connected to one of the first repairing lines, and each of the other ends of the flexible circuit board is electrically connected to one of the second repairing lines. The method for repairing a display panel according to claim 5, further comprising: placing an anisotropy between the pins of the flexible circuit board and the first repair lines and the second repair lines a conductive adhesive; and performing a bonding step to electrically connect each of the pins of one end of the flexible circuit board with one of the first repair lines through the anisotropic conductive paste, and to make the other end of the flexible circuit board Each of the pins is electrically connected to the one of the second repair wires through the anisotropic conductive paste. The method for repairing a display panel according to claim 5, wherein the first repairing lines and the second repairing lines further comprise a plurality of transparent conductive patterns, and the transparent conductive patterns and the plurality of pins Electrical connection. The method for repairing a display panel according to claim 7, wherein the material of the transparent conductive patterns comprises indium tin oxide. The method for repairing a display panel according to claim 5, wherein the welding step comprises a laser welding. The method of repairing a display panel according to claim 5, wherein the cutting process comprises a laser cutting. A display panel having a display area and a non-display area surrounding the display area, the non-display area around the display area having four corner areas, the display panel comprising: a pixel array, located in the display area; At least one first driving circuit is located in the non-display area on one side of the display area; at least one second driving circuit is located in the non-display area on the other side of the display area; and a plurality of signal lines are located in the non-display area The signal lines pass through the four corner regions, and each of the signal lines is electrically connected to the first driving circuit and the second driving circuit; and four sets of corner repairing lines, each set of corner repairing lines includes a plurality of a first repairing line and a plurality of second repairing lines respectively located at opposite ends of the signal lines corresponding to the corner area, wherein the first and second repairing lines and the The signal lines are electrically insulated, and the first repair lines are electrically insulated from the second repair lines, and each of the first and second repair lines has an overlapping area with the signal lines. The display panel of claim 11, further comprising a plurality of transparent conductive patterns covering and electrically connecting the first repair lines and the second repair lines. The display panel of claim 12, wherein the material of the transparent conductive patterns comprises indium tin oxide. The display panel of claim 11, wherein the first driving circuit is a source driving circuit, and the second driving circuit is a gate driving circuit.