CN101334988A - Display device with repaired circuit layout - Google Patents

Abstract

A display device with repaired circuit layout transmits data signals which can not be transmitted to a plurality of pixels due to broken data lines to the pixels through another path, an amplifier is arranged on the path, and the feedback point of the amplifier is positioned on the substrate of the pixels. The display device can solve the problem of disconnection of the data line and reduce the distortion of the data signal caused by attenuation.

Description

Display device with repaired circuit layout

technical field

The present invention relates to a display device, and more particularly to a display device with a repaired circuit layout.

Background technique

With the development of science and technology, electronic products have flooded people's daily life, and display devices have become an important medium for people to obtain information. Generally speaking, a display device includes a display panel (display panel) for displaying information and a driving circuit for controlling the display panel. The driving circuit provides data signals to pixels (Pixels) of the display panel through the data lines, so that the display panel presents images.

However, in the process of manufacturing the display device, the problem of disconnection of the data line often occurs, which reduces the yield of the display device. In order to solve the problem of disconnection of data lines, the prior art proposes a technique for repairing disconnection. FIG. 1 is a schematic diagram of a conventional display device with a repaired circuit layout. Referring to FIG. 1 , the display device 100 includes a first substrate 110 and a second substrate 120 , and the second substrate 120 has an amplifier 126 . The first substrate 110 is, for example, a display panel. The second substrate 120 is, for example, a driving circuit board. The first substrate 110 includes a plurality of pixels 112 . The second substrate 120 provides the data signal Vin to the pixels 112 of the first substrate 110 through a plurality of data lines (represented by data lines 122 and 124 ).

Assuming that the data line 122 is disconnected ("X" in FIG. 1 indicates the position of the disconnection), the data line 122 can be divided into data lines 122A and 122B, and the data signal Vin can only be transmitted to the data line 122A. In other words, the data line 122B cannot receive the data signal Vin. In order to enable the data line 122B to receive the data signal Vin, the prior art uses laser technology to provide another signal transmission path. That is, the welding point M1 and the welding point M3 are respectively welded by using laser technology. In this way, the data signal Vin can be transmitted to the data line 122B through the wire 122A, the welding point M1, the amplifier 126, and the welding point M3 in sequence, so that the pixels (not shown) coupled to the data line 122B can also display data. .

FIG. 2 is a schematic diagram of an equivalent circuit shown in FIG. 1 . Referring to FIG. 1 and FIG. 2 , the terminal A can receive the data signal Vin. Since the two input terminals of the amplifier 126 can be regarded as a virtual short circuit (VirtualShort), the terminal B also receives the data signal Vin. In addition, since the impedance between the terminals B and C is relatively small, the data signal Vout' at the terminal C can be regarded as the same as the data signal Vin at the terminal B. From the above, it can be deduced that the data signal Vout=Vin×Zs/(Zr+Zs) of the terminal D, wherein, the impedance Zr is the impedance of the wire between the terminal C and the terminal D, and the impedance Zs is the terminal D and the broken wire position “×” wire impedance between.

It should be noted that although the prior art solves the disconnection problem, the impedance between the terminal C and the terminal D causes signal attenuation. Signal attenuation will make the pixels (not shown) connected to the data line 122B unable to obtain signals of sufficient intensity, so there will be a large gap between the brightness displayed by the pixels (not shown) connected to the data line 122B and the ideal value. The gap caused the distortion of the picture. If the signal Vout at the terminal D can be made closer to the signal at the terminal A, the problem that the brightness of the pixel 112 connected to the data line 122B is inconsistent with the ideal value can be greatly improved.

In view of this, relevant manufacturers of display devices are eager to seek appropriate solutions to overcome the above-mentioned problems.

Contents of the invention

The invention provides a display device with repairing circuit layout, which not only solves the disconnection problem of the panel, but also reduces the distortion caused by signal attenuation.

The present invention proposes a display device with repaired circuit layout. The display device includes a first substrate, a second substrate, a first amplifier, a first backup line, a first repair line and a first feedback line. A plurality of data lines are disposed on the first substrate, wherein each data line is coupled to a plurality of corresponding pixels. A first driving circuit is disposed on the second substrate, and the first driving circuit is coupled to the first end of each data line. The first backup line and at least part of the first ends of the data lines are floating and suitable for welding to each other, and the first backup line is coupled to the first input end of the first amplifier. The first end of the first repair line is coupled to the output end of the first amplifier, and the second end of the first repair line is coupled to the second end of the first data line. The first end of the first feedback line is coupled to the second input end of the first amplifier, and the connection point between the second end of the first feedback line and the first repair line is located on the first substrate.

In an embodiment of the present invention, the above-mentioned display device further includes a second amplifier, a second backup line, a second repair line, and a second feedback line. The second preparation line is floatingly connected to the first end of another part of the data line and is suitable for mutual welding, and the second preparation line is coupled to the first input end of the second amplifier. The first end of the second repair line is coupled to the output end of the second amplifier, and the second end of the second repair line is coupled to the second end of the second data line. The first end of the second feedback line is coupled to the second input end of the second amplifier, and the connection point between the second end of the second feedback line and the second repair line is located on the first substrate.

In an embodiment of the present invention, the above display device further includes a third substrate. The second driving circuit is arranged on the third substrate. A plurality of scanning lines are further arranged on the first substrate. Each scanning line is coupled to a plurality of corresponding pixels, and the second driving circuit is coupled to the first end of each scanning line. In addition, the first repair line may pass through the second substrate, the third substrate and the first substrate in sequence. In addition, the first feedback line can pass through the second substrate, the third substrate and the first substrate in sequence.

In the display device of the present invention, the amplifier is used to transmit the data signal that cannot be transmitted to the plurality of pixels due to the disconnection of the data line to the above-mentioned pixel through another path, and the feedback point of the amplifier is located on the substrate on which the above-mentioned pixel is arranged. . In this way, not only the disconnection problem of the data line of the display device is solved, but also the distortion caused by the attenuation of the data signal is reduced.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

Description of drawings

FIG. 1 is a schematic diagram of a conventional display device with a repaired circuit layout.

FIG. 2 is a schematic diagram of an equivalent circuit shown in FIG. 1 .

FIG. 3A is a schematic diagram of a display device with a repaired circuit layout according to a first embodiment of the present invention.

FIG. 3B is a schematic diagram of a pixel according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram of an equivalent circuit of FIG. 3A .

FIG. 5 is a schematic diagram of a display device with a repaired circuit layout according to a second embodiment of the present invention.

FIG. 6 is a schematic diagram of a display device with a repaired circuit layout according to a third embodiment of the present invention.

Description of reference symbols

100, 300: display device

110, 310: the first substrate

330, 340: drive circuit

120, 320: second substrate

126, 350, 352: amplifier

360: third substrate

112, 302: pixels

122, 122A, 122B, 124, 332, 334, 336: data lines

342, 344: scan lines

"×": the location of the broken line

Bk1, Bk3: Reserve lines

R10, R12, R14: repair line

F10, F12, F14: Feedback line

A, B, C, D, A1, B1, C1: endpoints

Zs, Zr, Zf: Impedance

If, Ir, Is: Current

Vin, Vout, Vout': data signal

M1, M3, M10, M12, M14, M16: welding points

D1, D3, D5: connection points

304: Transistor

306: storage capacitor

308: pixel capacitance.

Detailed ways

FIG. 3A is a schematic diagram of a display device with a repaired circuit layout according to a first embodiment of the present invention. Please refer to FIG. 3A , the display device 300 with a repair circuit layout includes a first substrate 310 , a second substrate 320 , an amplifier 350 , a backup line Bk1 , a repair line R10 and a feedback line F10 . In this embodiment, the amplifier 350 is disposed on the second substrate 320 , and an operational amplifier is taken as an example for illustration. The first substrate 310 is illustrated by taking a glass substrate as an example. In other embodiments, the first substrate 310 may also be other types of substrates, such as transparent substrates, acrylic substrates, etc. Multiple data lines (represented by data lines 332, 334 and 336) are disposed on the first substrate 310, wherein each data line is coupled to a corresponding plurality of pixels (represented by pixel 302 here) . The first ends of the backup line Bk1 and the data lines 332 , 334 and 336 are floating and suitable for being welded to each other, and the backup line Bk1 is coupled to the first input end of the amplifier 350 . The display device 300 of this embodiment may be a liquid crystal display, an organic electroluminescent display or other types of display devices.

The driving circuit 330 is disposed on the second substrate 320 . In this embodiment, the second substrate 320 is described by taking a printed circuit board (Printed Circuit Board, PCB for short) as an example. In another embodiment, those skilled in the art can also use other forms of substrates according to their needs The second substrate 320 is implemented, for example, the second substrate 320 may be a flexible circuit board or other suitable substrates. In this embodiment, the driving circuit 330 is described by taking a data driving circuit (Data Drive Circuit) as an example. It should be noted that in FIG. 3A, the driving circuit 330 is shown as being connected between the first substrate 310 and the second substrate 320, which means that the driving circuit 330 is arranged between the first substrate 310 and the second substrate 320. flexible circuit board. The driving circuit 330 is used for providing data signals to the data lines 332 , 334 and 336 of the first substrate 310 . In other words, the driving circuit 330 is used to provide data signals to the pixels 302 . In another embodiment, the driving circuit 330 may also be directly configured on the second substrate 320 . In addition, those skilled in the art should know that although this embodiment is described with four driving circuits 330 , in other embodiments, the number of driving circuits 330 can be adjusted arbitrarily according to the requirement. For example, in another embodiment, the number of the driving circuit 330 may be one.

FIG. 3B is a schematic diagram of a pixel according to the first embodiment of the present invention. Please refer to FIG. 3A and FIG. 3B at the same time. In this embodiment, the driving circuit 340 takes a scan driving circuit (Scan Drive Circuit) as an example. The scanning signal is sent to the pixel 302 . Each pixel 302 includes, for example, a transistor 304 , a storage capacitor 306 and a pixel capacitor 308 , as shown in FIG. 3B .

As mentioned above, the gate terminal of the transistor 304 is coupled to the scan line 342 , and the first source and drain of the transistor 304 are coupled to the data line 332 . A first terminal of the storage capacitor 306 is coupled to the second source and drain of the transistor 304 , and a second terminal of the storage capacitor 306 is coupled to the first voltage. A first terminal of the pixel capacitor 308 is coupled to the second source and drain of the transistor 304 , and a second terminal of the pixel capacitor 308 is coupled to the second voltage. In short, the driving circuit 340 is used to provide scan signals to the pixels 302 . Although the embodiment in FIG. 3A is described with three driving circuits 340 , in other embodiments, the number of driving circuits 340 can be adjusted arbitrarily according to the requirement. For example, the number of driving circuits 340 may be one.

Please continue to refer to FIG. 3A , when the data line 334 is disconnected (the location of the disconnection is represented by “×” in FIG. 3A ), the data signal provided by the driving circuit 330 will not be sent to the lower half of the data line 334. Each pixel 302 coupled. In order to enable the data signal to be transmitted to each pixel 302 coupled to the lower half of the data line 334 , this embodiment provides another path for transmitting the data signal. For example, after the disconnection of the data line 334 is confirmed, the welding point M10 is firstly welded together by laser, that is, the backup line Bk1 and the data line 334 are fused to each other at the floating position. In this way, the backup line Bk1 and the data line 334 can be connected to each other, and the data signal provided by the driving circuit 330 can be input to the first input of the amplifier 350 through the data line 334, the welding point M10 and the backup line Bk1 in sequence. terminal (positive input terminal). Although this embodiment uses laser technology as an example to weld the backup line Bk1 and the data line 334 , those skilled in the art can also change the implementation according to their needs. In other words, when the data line 334 is disconnected, the first end of the data line 334 can be coupled to the first input end of the amplifier 350 in any manner.

As mentioned above, the welding point M12 is then welded to couple the repair line R10 and the lower half of the data line 334 to each other, but other suitable methods can also be used to couple the repair line R10 to the lower half of the data line 334 . In this way, the data signal provided by the driving circuit 330 can pass through the data line 334, the welding point M10, the backup line Bk1, the amplifier 350, the repair line R10, the feedback line F10 and the welding point M12 to reach the lower half of the data line 334, Solve the problem that the data line 334 is disconnected.

Please refer to FIG. 3A again, from which the coupling relationship between the repairing line R10 and the feedback line F10 can be clearly seen. The first end of the repair line R10 is coupled to the output end of the amplifier 350 . The first terminal of the feedback line F10 is coupled to the second input terminal (the negative input terminal) of the amplifier 350 . The connection point D1 between the second end of the feedback line F10 and the repair line R10 is located on the first substrate 310 . Those skilled in the art can also change the position of the connection point D1 according to the spirit of the present invention and the teachings of the aforementioned embodiments according to their needs, so that the feedback signal of the amplifier 350 can be obtained from the lower half of the data line 334 closest to Feedback on the position of the head. In this way, the advantage of reducing signal attenuation can be obtained.

。换言之，本实施例中因采用将反馈线F10与修复线R10的连接点D1的位置配置于第一基板310上的设计，故可大幅减少数据信号的衰减。如此，即可避免因信号衰减，而使断线位置“×”下方的数据线334所连接的像素302所显示的亮度不足的问题。As mentioned above, FIG. 4 is a schematic diagram of an equivalent circuit of FIG. 3A. Please refer to FIG. 3A and FIG. 4 at the same time. The terminal A1 in FIG. 4 can receive the data signal Vin. Since the two input terminals of the amplifier 350 are virtual short-circuited, the terminal B1 can also receive the data signal Vin. The impedance Zr represents the impedance of the repairing line R10, the impedance Zf represents the impedance of the feedback line F10, and the impedance Zs represents the wire impedance of the data line 334 from the welding point M12 to the broken line “×”. Suppose the data signal passing through the terminal C1 is Vout', the data signal passing through the connection point D1 is Vout, the current passing through the terminal C1 is Ir, the current from the connection point D1 to the impedance Zs is Is, and the current from the connection point D1 to the impedance Zf For If. From the above, it can be deduced that the voltage difference of the feedback line F10 (that is, the voltage difference of the impedance Zf) ΔV=Vout−Vin=If×Zf, so Vout=Vin+If×Zf. And because the input end of the amplifier 350 is high impedance, so the current If tends to 0, that is to say

. In other words, in this embodiment, since the position of the connection point D1 of the feedback line F10 and the repair line R10 is arranged on the first substrate 310 , the attenuation of the data signal can be greatly reduced. In this way, the problem of insufficient brightness displayed by the pixel 302 connected to the data line 334 below the disconnection position “×” due to signal attenuation can be avoided.

Those skilled in the art can also change the number of amplifiers according to the spirit of the present invention and the teachings of the above-mentioned embodiments according to their needs, and adjust their coupling relationship properly, so as to repair multiple disconnection problems. For example, FIG. 5 is a schematic diagram of a display device with a repaired circuit layout according to a second embodiment of the present invention. Please refer to FIG. 5, the first substrate 310, the second substrate 320, the driving circuit 330, the driving circuit 340, the repair line R10, the feedback line F10, the data lines 332-336, the scanning lines 342 and 344, the pixel 302 and the amplifier 350 are related to the above The embodiments are the same, and will not be repeated here. It is worth noting that the amplifier 352, the backup line Bk3, the repair line R12 and the feedback line F12 of this embodiment.

As mentioned above, when the data line 336 is also disconnected (the position of the disconnection is indicated by "X" in FIG. connected to each pixel 302. In order to enable the data signal to be transmitted to each pixel 302 coupled to the lower half of the data line 336 , this embodiment provides another path for transmitting the data signal. For example, after the disconnection of the data line 336 is confirmed, the welding point M14 is welded together by laser, that is, the backup line Bk3 and the data line 336 are welded to each other at the floating position. In this way, the backup line Bk3 and the data line 336 can be connected to each other, and the data signal provided by the driving circuit 330 can be input to the first input of the amplifier 352 through the data line 336, the welding point M14 and the backup line Bk3 in sequence. terminal (positive input terminal).

As mentioned above, the welding point M16 is then welded, so that the repair line R12 and the lower half of the data line 336 are coupled to each other. In this way, the data signal provided by the driving circuit 330 can pass through the data line 336 , the welding point M14 , the backup line Bk3 , the amplifier 352 , the repairing line R12 , the feedback line F12 and the welding point M16 to reach the lower half of the data line 336 . In this way, the problem of disconnection of the data line 336 can be solved, so that the pixels 302 coupled to the lower half of the data line 336 can receive the data signal.

Please refer to FIG. 5 again, from which it can be clearly seen the coupling relationship between the repair line R12 and the feedback line F12. The first end of the repair line R12 is coupled to the output end of the amplifier 352 . The first terminal of the feedback line F12 is coupled to the second input terminal (the negative input terminal) of the amplifier 352 . The connection point D3 between the second end of the feedback line F12 and the repair line R12 is located on the first substrate 310 . It should be noted that the closer the connection point D3 is to the disconnected data line 336 , the smaller the signal attenuation will be. Therefore, in this embodiment, the connection point D3 is designed on the first substrate 310 to reduce data signal attenuation.

Those skilled in the art can also change the coupling paths of the repair line and the feedback line according to the spirit of the present invention and the teachings of the above-mentioned embodiments according to their needs, and can appropriately change the arrangement position of the driving circuit. For example, FIG. 6 is a schematic diagram of a display device with a repaired circuit layout according to a third embodiment of the present invention. Please refer to FIG. 6 , the first substrate 310 , the second substrate 320 , the driving circuit 330 , the data lines 332 - 336 , the scan lines 342 and 344 , the pixels 302 and the amplifier 350 are the same as those of the above-mentioned embodiments, and will not be repeated here. It should be noted that the repair line R14 , the feedback line F14 , the driving circuit 340 and the third substrate 360 in this embodiment.

As mentioned above, the third substrate 360 is described by taking a printed circuit board as an example. In other embodiments, the third substrate 360 may also be a flexible circuit board or other suitable substrates. In this embodiment, the driving circuit 340 is configured on a flexible circuit board connected between the first substrate 310 and the third substrate 360 . The driving circuit 340 is used for providing scan signals to the scan lines 342 and 344 of the first substrate 310 . In another embodiment, the driving circuit 340 may also be directly disposed on the third substrate 360 . In addition, the number of the driving circuit 340 can also be changed according to the requirement, for example, the number of the driving circuit 340 can be one in another embodiment.

The impedance of the wiring formed on the printed circuit board (third substrate 360 ) may be smaller than the impedance of the wiring formed on the glass substrate (first substrate 310 ). Therefore, in order to improve the problem of signal attenuation, the repairing line R14 of this embodiment passes through the second substrate 320 and the third substrate 360 to the first substrate 310 sequentially from the output end of the amplifier 350 . The feedback line F14 passes through the second substrate 320 and the third substrate 360 sequentially from the negative input terminal of the amplifier 350 to the first substrate 310 . Meanwhile, the connection point D5 of the repair line R14 and the feedback line F14 is located on the first substrate 310 . In this way, the impedance of the repair line R14 and the feedback line F14 can be further reduced, thereby improving the attenuation of the data signal.

Those skilled in the art can also change the arrangement position of the amplifier according to the spirit of the present invention and the teachings of the above-mentioned embodiments according to their needs, and properly adjust the coupling paths of the backup line, the feedback line and the repair line. For example, the amplifier 350 of the embodiment of FIG. 6 can be configured on the third substrate 360 . For another example, the amplifier 350 of each embodiment may be integrated in the driving circuit 330 or the driving circuit 340 .

To sum up, in the above-mentioned display device with repaired circuit layout in each embodiment of the present invention, it has the following advantages:

1. Provide a backup signal transmission path, so that when the data line is disconnected, the data signal is transmitted to the pixel coupled to the lower part of the data line through the signal transmission path, so as to solve the disconnection of the data line of the display device line problem.

2. The feedback point of the amplifier is arranged on the substrate where the disconnection occurs, which reduces the distortion of the data signal due to attenuation.

3. The feedback line connecting the repair line at the output end of the amplifier and the negative input end of the amplifier should be formed as much as possible on the substrate that can be made of low-impedance materials to improve the attenuation of the data signal.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some modifications and changes without departing from the spirit and scope of the present invention. Modification, so the scope of protection of the present invention should be defined by the patent scope of the present invention.

Claims (10)

1. A display device with a repaired circuit layout, comprising: A first substrate, on which a plurality of data lines are arranged, wherein each of the data lines is coupled to a corresponding plurality of pixels; A second substrate, on which a first drive circuit is disposed, and the first drive circuit is coupled to the first end of the data line; a first amplifier; A first preparation line, floating at least part of the first ends of the data lines and suitable for mutual welding, the first preparation line is coupled to the first input end of the first amplifier; a first repair line, the first end of the first repair line is coupled to the output end of the first amplifier, the second end of the first repair line is coupled to the second end of the first data line; and A first feedback line, the first end of the first feedback line is coupled to the second input end of the first amplifier, the connection point between the second end of the first feedback line and the first repair line is located at the first substrate. 2. The display device according to claim 1, further comprising: a second amplifier; a second preparation line, floating the first end of another part of the data line and suitable for mutual welding, and the second preparation line is coupled to the first input end of the second amplifier; a second repair line, the first end of the second repair line is coupled to the output end of the second amplifier, the second end of the second repair line is coupled to the second end of the second data line; and A second feedback line, the first end of the second feedback line is coupled to the second input end of the second amplifier, the connection point between the second end of the second feedback line and the second repair line is located at the first substrate. 3. The display device according to claim 1, further comprising: A third substrate, a second drive circuit is arranged on the third substrate, wherein a plurality of scanning lines are further arranged on the first substrate, each of the scanning lines is coupled to a corresponding plurality of pixels, and the The second driving circuit is coupled to the first end of the scan line. 4. The display device according to claim 3, wherein the first repair line passes through the second substrate, the third substrate and the first substrate in sequence. 5. The display device as claimed in claim 3, wherein the first feedback line passes through the second substrate, the third substrate and the first substrate in sequence. 6. The display device as claimed in claim 3, wherein the third substrate is a printed circuit board. 7. The display device according to claim 3, wherein each of said pixels comprises: a transistor, the gate terminal of the transistor is coupled to one of the scanning lines, and the first source and drain of the transistor are coupled to one of the data lines; a storage capacitor, the first end of the storage capacitor is coupled to the second source and drain of the transistor, and the second end of the storage capacitor is coupled to a first voltage; and A pixel capacitor, the first end of the pixel capacitor is coupled to the second source and drain of the transistor, and the second end of the pixel capacitor is coupled to a second voltage. 8. The display device as claimed in claim 1, wherein the first substrate is a glass substrate. 9. The display device as claimed in claim 1, wherein the second substrate is a printed circuit board. 10. The display device as claimed in claim 1, wherein the first input terminal of the first amplifier is a positive input terminal, and the second input terminal of the first amplifier is a negative input terminal.

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