Line break repair circuit, line break repair method, and display device

Abstract

The application discloses a broken line repairing circuit, a broken line repairing method and a display device. The broken line repairing circuit comprises an operational amplifier, a power supply voltage detection module and a first control module. The power supply voltage detection module is used for detecting a power supply voltage. When the power supply voltage is lower than a preset voltage, the power supply voltage detection module outputs a first detection signal. The first control module controls the operational amplifier to stop working and controls a repairing line to be in communication with a normal data line. When the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module outputs a second detection signal. The first control module controls the operational amplifier to normally work and controls the repairing line to receive the repairing voltage. Through the above design, not only the broken data line can be repaired, but also the problem that the data signal is attenuated due to the load of the repairing line and the display brightness is influenced can be avoided. Furthermore, when the display panel is powered off, the problem that the repaired broken data line is brighter than other normal data lines can be avoided.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a broken wire repair circuit, a broken wire repair method, and a display device. Background Technology

[0002] A Liquid Crystal Display (LCD) comprises a display panel, a data driver chip, and a scan driver circuit. The display panel has multiple parallel scan lines and multiple parallel data lines, arranged perpendicularly to each other. These scan lines and data lines define multiple pixel areas arranged in a matrix. The data driver chip receives display data from the front end and performs complex data processing, then performs digital-to-analog conversion to generate grayscale voltages, which are sent to the data lines within the display panel. The scan driver circuit is connected to the scan lines and scans them line by line.

[0003] During the manufacturing process of display panels, due to certain defects, data cables inside the panel may break, resulting in display problems such as black lines, dark lines, and weak lines. Although there are currently many solutions for repairing broken data cables, the repaired data cable may appear brighter when the device is powered off, affecting the display quality. Summary of the Invention

[0004] The purpose of this application is to provide a broken wire repair circuit, a broken wire repair method, and a display device to improve the abnormal phenomenon of the repair data cable being too bright when the device is turned off.

[0005] This application discloses a broken wire repair circuit for repairing broken data lines in a display panel. The circuit includes an operational amplifier, a power supply voltage detection module, and a first control module. The non-inverting input of the operational amplifier is connected to the first end of the broken data line to receive the data voltage supplied to the broken data line. The output of the operational amplifier is connected to the second end of the broken data line via a repair wire to provide a repair voltage to the second end of the broken data line. The inverting input of the operational amplifier is connected to its output. The power supply voltage detection module is connected to a power supply and is used to detect the power supply voltage. When the power supply voltage is lower than a preset voltage, the power supply voltage detection module outputs a first detection signal; when the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module outputs a second detection signal; the first control module is connected to the power supply voltage detection module, the operational amplifier, and the repair line. When the power supply voltage detection module outputs the first detection signal, the first control module controls the operational amplifier to stop working and controls the repair line to connect with the normal data line; when the power supply voltage detection module outputs the second detection signal, the first control module controls the operational amplifier to work normally and controls the repair line to receive the repair voltage.

[0006] Optionally, the first control module includes a first transistor and a second transistor. The control terminal of the first transistor is connected to the power supply voltage detection module, the input terminal of the first transistor is connected to the power supply port, and the output terminal of the first transistor is connected to the positive power supply terminal of the operational amplifier. The control terminal of the second transistor is connected to the power supply voltage detection module, the input terminal of the second transistor is used to communicate with the normal data line, and the output terminal of the second transistor is connected to the repair line. The first detection signal includes a first sub-signal and a second sub-signal. The first sub-signal is used to control the first transistor to turn off, and the second sub-signal is used to control the second transistor to turn on. The second detection signal includes a third sub-signal and a fourth sub-signal. The third sub-signal is used to control the first transistor to turn on, and the fourth sub-signal is used to control the second transistor to turn off.

[0007] Optionally, when the power supply voltage detection module outputs a first detection signal, the first control module controls the repair line to connect with the data output channel corresponding to the broken data line, so as to connect the normal data line.

[0008] Optionally, when the power supply voltage detection module outputs a first detection signal, the first control module controls the repair line to connect to the common electrode in the display panel to connect the normal data line.

[0009] Optionally, the first transistor and the second transistor are of different types, the first sub-signal and the second sub-signal are the same signal, and the third sub-signal and the fourth sub-signal are the same signal.

[0010] Optionally, the disconnection repair circuit further includes a second control module. The input terminal of the second control module is connected to the power supply voltage detection module, and the output terminal of the second control module is used to connect to the backlight driver chip. When the power supply voltage detection module outputs the first detection signal, the second control module controls the backlight driver chip to output a low-level voltage, controlling the backlight not to emit light. When the power supply voltage detection module outputs the second detection signal, the second control module controls the backlight driver chip to output a high-level voltage, controlling the backlight to emit light.

[0011] This application also discloses a method for repairing broken wires, used in the broken wire repair circuit described above. The broken wire repair method includes the following steps:

[0012] Identify the broken data cable;

[0013] Connect the first end of the broken data line to the non-inverting input of the operational amplifier, and connect the second end of the broken data line to the repair line;

[0014] The power supply voltage is detected by the power supply voltage detection module; and

[0015] When the power supply voltage is lower than the preset voltage, the power supply voltage detection module outputs a first detection signal, the operational amplifier stops working, and the repair line is connected to the normal data line; when the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module outputs a second detection signal, the operational amplifier works normally, and the repair line receives the repair voltage.

[0016] Optionally, the first control module includes a first transistor and a second transistor. The control terminal of the first transistor is connected to the power supply voltage detection module, the input terminal of the first transistor is connected to the power supply port, and the output terminal of the first transistor is connected to the positive power supply terminal of the operational amplifier. The control terminal of the second transistor is connected to the power supply voltage detection module, the input terminal of the second transistor is used to communicate with the normal data line, and the output terminal of the second transistor is connected to the repair line. When the power supply voltage detection module outputs a first detection signal, the first transistor is turned on, and the second transistor is turned off. When the power supply voltage detection module outputs a second detection signal, the first transistor is turned off, and the second transistor is turned on.

[0017] Optionally, when the power supply voltage detection module outputs a first detection signal, it controls the backlight driver chip to output a low-level voltage, thus controlling the backlight not to emit light; when the power supply voltage detection module outputs a second detection signal, it controls the backlight driver chip to output a high-level voltage, thus controlling the backlight to emit light.

[0018] This application also discloses a display device, which includes a display panel and a broken line repair circuit as described above. The display panel includes multiple parallel data lines, and the broken line repair circuit is used to repair broken data lines in the display panel.

[0019] The beneficial effects of this application embodiment are as follows: This application embodiment uses a broken wire repair circuit containing an operational amplifier, a power supply voltage detection module, and a first control module to repair broken data lines in the display panel. When a broken data line is detected, by connecting the first end of the broken data line to the non-inverting input terminal of the operational amplifier and connecting the second end of the broken data line to the output terminal of the operational amplifier through a repair wire, the same data signal can not only be transmitted from the first end of the broken data line to one half of the broken data line, but can also be repaired by the operational amplifier and transmitted to the other half of the broken data line through the repair wire and the second end of the broken data line. This ensures that both broken data lines can receive data signals, and the more distant end receives the repaired signal, avoiding the problem of data signal attenuation due to the load of the repair wire, which affects the display brightness. Furthermore, to avoid the parasitic capacitance on the repair line causing a slower power-off when the display panel is powered off, resulting in the repaired broken data line being brighter than other normal data lines, this embodiment of the application also uses a power supply voltage detection module to detect the power supply voltage. When the power supply voltage drops below a preset voltage, the first control module cuts off the power supply to the operational amplifier, controls the operational amplifier to stop working, and controls the repair line to connect with the normal data line. This rapidly reduces the parasitic capacitance on the repair line and makes the voltage on the repair line and the repaired broken data line more consistent with the voltage on the normal data line, thus avoiding a brightness difference between the repaired broken data line and the normal data line. Attached Figure Description

[0020] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of a display device provided in an embodiment of this application;

[0022] Figure 2 This is a partial schematic diagram of a display device;

[0023] Figure 3 This is a schematic diagram of the voltage waveform on the data output channel when a display panel is powered off.

[0024] Figure 4 This is a schematic diagram of a broken wire repair circuit provided in the first embodiment of this application;

[0025] Figure 5 yes Figure 4 Corresponding waveform diagram;

[0026] Figure 6 This is a schematic diagram of another broken wire repair circuit provided in the first embodiment of this application;

[0027] Figure 7 This is a schematic diagram of a broken wire repair circuit provided in the second embodiment of this application;

[0028] Figure 8 yes Figure 7 Corresponding waveform diagram;

[0029] Figure 9 This is a flowchart of a broken wire repair method provided in the third embodiment of this application.

[0030] Among them, 10 is a display device; 20 is a display panel; S1 is a broken data line; S2 is a normal data line; B is the first end of the broken data line; E is the second end of the broken data line; b is a horizontal wiring; 21 is a repair line; 30 is a printed circuit board; 31 is a source driver chip; 100 is a broken line repair circuit; 110 is an operational amplifier; 120 is a power supply voltage detection module; 130 is a first control module; 131 is a first transistor; 132 is a second transistor; 140 is a second control module; and 200 is a backlight driver chip. Detailed Implementation

[0031] It should be understood that the terminology, specific structural and functional details used herein are merely for describing particular embodiments and are representative. However, this application may be implemented in many alternative forms and should not be construed as being limited to the embodiments set forth herein.

[0032] Furthermore, unless otherwise explicitly specified and limited, "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] The present application will now be described in detail with reference to the accompanying drawings and optional embodiments.

[0034] Figure 1 This is a schematic diagram of a display device provided in an embodiment of this application, such as... Figure 1 As shown, the display device 10 includes a display panel 20, a broken line repair circuit 100, and a printed circuit board assembly (PCBA). The display area of ​​the display panel 20 has multiple parallel data lines, and the non-display area of ​​the display panel 20 has repair lines 21 arranged around the display area. The printed circuit board 30 also has multiple source driver chips, which are connected to the data lines on the display panel 20 through data output channels in a chip-on-film (COF) film to provide data signals to the data lines. The broken line repair circuit 100 can be disposed on the display panel 20, or it can be disposed on the printed circuit board 30, to repair broken data lines in the display panel 20.

[0035] The display panel 20 has a horizontal wiring b at the end of each flip-chip film away from the printed circuit board 30. The horizontal wiring b is on a different layer from the data line in the display panel 20. Under normal circumstances, the two are not connected, and the data line is not connected to the repair line 21.

[0036] like Figure 1 As shown, when a data line (BE in the diagram) in the display area breaks, the break point is A, dividing the data line (BE in the diagram) into a first segment BA and a second segment EA. At this time, by connecting the first end B of the broken data line to the adjacent horizontal wiring b, and connecting the second end E of the broken data line to the repair line 21, while simultaneously cutting off the excess portion of the repair line 21 (the vertical line on the repair line in the diagram indicates the cutting position), a path is formed between the broken line repair circuit 100, the repair line 21, and the second segment EA of the broken data line. At this point, the sub-pixels in region a corresponding to the first segment BA of the broken data line display normally, and the sub-pixels in region h corresponding to the second segment EA of the broken data line restore display through the charging path formed by the repair line 21, thus achieving the purpose of broken line repair.

[0037] It should be noted that repair line 21 can be used Figure 1 The design can be a multi-segment layout or a continuous trace; the choice can be made based on the actual situation and is not limited here.

[0038] Because the repair line 21 is relatively long and has a large load, when the data signal is transmitted through the repair line 21 to the second segment EA of the broken data line, the load on the repair line 21 causes insufficient charging of the sub-pixels in the h region corresponding to the second segment EA of the broken data line. That is, the target gray level voltage level cannot be reached within the charging time, resulting in a significant boundary difference between the h region and other display areas when displayed. Therefore, this embodiment of the application increases the signal voltage transmitted to the second segment EA of the broken data line through the broken line repair circuit 100, thereby offsetting the signal attenuation caused by the load on the repair line 21, so that the display brightness of the sub-pixels in the h region is the same as or similar to that of other areas, achieving the repair effect.

[0039] like Figure 2 As shown in the figure, as an exemplary circuit design of a part of a display device, S1 represents a broken data line, S11 represents the normal segment of the abnormal line in the broken data line, that is, the segment connected to the data output channel; S12 represents the abnormal line repair segment, that is, the end not connected to the data output channel; and S2 represents the normal data line. An operational amplifier (OP) 110 is provided on the printed circuit board 30. The positive input terminal (+) of the operational amplifier 110 is connected to the data output channel corresponding to the broken data line S1. The output channel corresponding to the broken data line S1 outputs a data signal to the normal segment S11 of the abnormal line, and also outputs a data signal to the positive input terminal (+) of the operational amplifier 110. The output terminal of the operational amplifier 110 is connected to the repair line 21, and the negative input terminal (-) of the operational amplifier 110 is connected to the output terminal of the operational amplifier 110, forming an OP follower circuit. The output terminal of the operational amplifier 110 outputs a repair signal, which enters from the top of the abnormal line repair segment S12 through the repair line 21. The positive power supply terminal of operational amplifier 110 is connected to the power supply port VAA, and the negative power supply terminal of operational amplifier 110 is grounded to GND.

[0040] Figure 3 This is a schematic diagram of the voltage waveform on the data output channel when the display panel is powered off, such as... Figure 3 As shown, when the display panel is powered off, to avoid indeterminate and random output voltages from the data output channels, when the power supply voltage DVDD drops below the preset voltage VT, all data output channels on the source driver chip are shorted together and simultaneously connected to the common electrode (VCOM), causing the voltage on all data lines (S1-Sn) to synchronously return to zero. It should be noted that the power supply voltage DVDD is provided by the power supply to the printed circuit board, and the preset voltage VT is a voltage greater than zero and less than the maximum value of the power supply voltage, set according to specific circumstances. Figure 3 The two curves below represent the positive and negative polarities of the data signal, while the shaded area in the figure represents the high-impedance state, in which no signal is output.

[0041] However, since the repair line 21 is connected to the output of the operational amplifier 110, the repair line 21 and the abnormal line repair segment S12 are not shorted together with other data output channels on the source driver chip 31 when the power is off. In addition, there is a parasitic capacitance on the repair line 21, which makes the voltage on the repair line 21 drop more slowly, resulting in the abnormal line repair segment S12 being brighter than other data lines, affecting the picture effect.

[0042] Based on the above problems, this application provides the following multiple embodiments to ensure that the brightness of the repair data line (abnormal line repair segment S12) is the same as that of other data lines when the device is powered off, thereby avoiding the problem of the repair data line being too bright.

[0043] like Figure 1 , Figure 4 and Figure 5 As shown in the first embodiment of this application, a broken data line repair circuit 100 for repairing a broken data line S1 in a display panel 20 is provided. The broken data line repair circuit 100 includes an operational amplifier 110, a power supply voltage detection module 120, and a first control module 130. The positive input terminal (+) of the operational amplifier 110 is connected to the first terminal B of the broken data line to receive the data voltage provided to the broken data line S1. Of course, the positive input terminal (+) of the operational amplifier 110 can also be connected to the data output channel corresponding to the broken data line S1. The output terminal of the operational amplifier 110 is connected to the second terminal E of the broken data line through a repair line 21 to provide a repair voltage to the second terminal E of the broken data line. The inverting input terminal (-) of the operational amplifier 110 is connected to the output terminal of the operational amplifier 110 to form a follower circuit of the operational amplifier 110.

[0044] The power supply voltage detection module 120 is connected to the power supply and is used to detect the power supply voltage DVDD. When the power supply voltage DVDD is lower than the preset voltage VT, the power supply voltage detection module 120 outputs a first detection signal; when the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module 120 outputs a second detection signal.

[0045] The first control module 130 is connected to the power supply voltage detection module 120, the operational amplifier 110, and the repair line 21. When the power supply voltage detection module 120 outputs a first detection signal, the first control module 130 controls the operational amplifier 110 to stop working and controls the repair line 21 to connect with the normal data line S2. When the power supply voltage detection module 120 outputs a second detection signal, the first control module 130 controls the operational amplifier 110 to work normally and controls the repair line 21 to receive the repair voltage.

[0046] It should be noted that the preset voltage VT refers to the power supply voltage at which the repaired data line (i.e., the repaired broken data line) is not visible when the display panel is powered off during the test. The preset voltage VT needs to be adjusted according to the display panel type and size, and is not a fixed value. In some cases, the preset voltage VT can be 30% of the power supply voltage when the display panel 20 is displaying normally.

[0047] This embodiment employs a broken data line repair circuit 100 containing an operational amplifier 110, a power supply voltage detection module 120, and a first control module 130 to repair a broken data line S1 in the display panel 20. When a broken data line S1 is detected, the first end B of the broken data line is connected to the non-inverting input terminal of the operational amplifier 110, and the second end E of the broken data line is connected to the output terminal of the operational amplifier 110 via a repair line 21. At this time, the same data signal can not only be transmitted from the first end B of the broken data line to one half of the broken data line BA, but can also be repaired by the operational amplifier 110 and transmitted through the repair line 21 and the second end E of the broken data line to the other half of the broken data line EA. This ensures that both broken data lines can receive data signals, and the more distant end receives the repaired signal, avoiding the problem of data signal attenuation due to the load on the repair line 21, which would affect the display brightness.

[0048] Furthermore, to avoid the parasitic capacitance on the repair line 21 causing a slower power-off when the display panel 20 is powered off, resulting in the repaired broken data line S1 being brighter than other normal data lines S2, this embodiment of the application also uses a power supply voltage detection module 120 to detect the power supply voltage DVDD. When the power supply voltage DVDD drops below a preset voltage VT, the first control module 130 cuts off the power supply to the operational amplifier 110, controls the operational amplifier 110 to stop working, and controls the repair line 21 to connect with the normal data line S2, so that the parasitic capacitance on the repair line 21 is reduced quickly, and the voltage on the repair line 21 and the repaired broken data line S1 tends to be consistent with the voltage on the normal data line S2, thus avoiding a brightness difference between the repaired broken data line S1 and the normal data line S2.

[0049] In this embodiment, the first control module 130 includes a first transistor 131 and a second transistor 132. The control terminal of the first transistor 131 is connected to the power supply voltage detection module 120, the input terminal of the first transistor 131 is connected to the power supply port VAA, and the output terminal of the first transistor 131 is connected to the positive power supply terminal of the operational amplifier 110. The control terminal of the second transistor 132 is connected to the power supply voltage detection module 120, the input terminal of the second transistor 132 is used to communicate with the normal data line, and the output terminal of the second transistor 132 is connected to the repair line 21.

[0050] The first detection signal includes a first sub-signal VG1 and a second sub-signal VG2. The first sub-signal VG1 is used to control the first transistor 131 to turn off, and the second sub-signal VG2 is used to control the second transistor 132 to turn on. The second detection signal includes a third sub-signal and a fourth sub-signal. The third sub-signal is used to control the first transistor 131 to turn on, and the fourth sub-signal is used to control the second transistor 132 to turn off.

[0051] By using a transistor design as the first control module 130 to control the connection between the operational amplifier 110 and the repair line 21, the effect of simultaneous control can be achieved using only two transistors, which helps to simplify the broken wire repair circuit 100 and improve the circuit integration.

[0052] In some embodiments, the first transistor 131 and the second transistor 132 are of the same type and are both N-type transistors. N-type transistors are turned on at a high level and turned off at a low level. At this time, the first sub-signal is a low-level signal, the second sub-signal is a high-level signal, the third sub-signal is a high-level signal, and the fourth sub-signal is a low-level signal.

[0053] In some embodiments, the first transistor 131 and the second transistor 132 are of the same type and are both P-type transistors. P-type transistors are turned on at a low level and turned off at a high level. At this time, the first sub-signal is a high-level signal, the second sub-signal is a low-level signal, the third sub-signal is a low-level signal, and the fourth sub-signal is a high-level signal.

[0054] When the first transistor 131 and the second transistor 132 are of the same type, the selection and procurement of the first transistor 131 and the second transistor 132 are relatively convenient.

[0055] In some embodiments, the first transistor 131 and the second transistor 132 are of different types, the first transistor 131 is a P-type transistor and the second transistor 132 is an N-type transistor. In this case, the first sub-signal is a high-level signal, the second sub-signal is a high-level signal, the third sub-signal is a low-level signal and the fourth sub-signal is a low-level signal.

[0056] In some embodiments, the first transistor 131 and the second transistor 132 are of different types, the first transistor 131 is an N-type transistor and the second transistor 132 is a P-type transistor. In this case, the first sub-signal is a low-level signal, the second sub-signal is a low-level signal, the third sub-signal is a high-level signal, and the fourth sub-signal is a high-level signal.

[0057] When the first transistor 131 and the second transistor 132 are of different types, the first sub-signal and the second sub-signal can be combined into the same signal, and the third sub-signal and the fourth sub-signal can also be combined into the same signal. At this time, regardless of whether the power supply voltage is greater than or equal to the preset voltage or less than the preset voltage, the power supply voltage detection module 120 only needs to output a control signal, which is beneficial to simplify the control design.

[0058] In some embodiments, the first control module 130 may also adopt other designs, such as using two single-pole double-throw switches, or not just two transistors, but three or more transistors to control the voltage received by the operational amplifier 110 and the repair line 21.

[0059] In some embodiments, the first control module 130 may be integrated into the timing controller of the display device.

[0060] In some embodiments, the power supply voltage DVDD employs a voltage divider design. The power supply voltage DVDD is connected to the power supply voltage detection module 120 via a first resistor R1, and is also grounded via a second resistor R2. By appropriately selecting the resistance ratio of the first resistor R1 and the second resistor R2, the sensitivity of the power supply voltage DVDD to load changes can be significantly reduced, ensuring a more stable power supply voltage DVDD output. Furthermore, the preset voltage DVDD can be adjusted by regulating the resistance values ​​of the first resistor R1 and the second resistor R2.

[0061] In this embodiment, when the power supply voltage detection module 120 outputs a first detection signal, the first control module 130 controls the repair line 21 to connect with the data output channel corresponding to the broken data line S1, so as to connect the normal data line. Specifically, the input terminal of the second transistor 132 is connected with the data output channel corresponding to the broken data line S1. When the display panel is turned off and the power supply voltage DVDD is lower than the preset voltage VT, the source driver chip 31 does not output data voltage, and the output channels of the normal data line S2 are shorted together; through the output terminal of the second transistor 132, the repair line 21 is connected with the data output channel, so that the broken data line is also shorted together with other normal data lines, and the parasitic capacitance in the repair line 21 can be quickly released, thereby keeping the voltage on the repaired broken data line S1 synchronized with the voltage on other normal data lines S2, thus avoiding the problem that the repaired broken data line S1 is brighter than other normal data lines S2.

[0062] like Figure 6 As shown, in some embodiments, the broken wire repair circuit 100 further includes a second control module 140. The input terminal of the second control module 140 is connected to the power supply voltage detection module 120, and the output terminal of the second control module 140 is connected to the backlight driver chip 200. When the power supply voltage is lower than a preset voltage, the power supply voltage detection module 120 outputs the first detection signal, and the second control module 140 controls the backlight driver chip 200 to output a low-level voltage. At this time, the backlight module in the display device does not emit light, causing the display panel to go black earlier, instead of waiting until the power supply voltage becomes zero before the backlight module stops emitting light, thus making the overly bright problem of the repaired broken data line S1 invisible. When the power supply voltage DVDD is greater than or equal to the preset voltage VT, the power supply voltage detection module 120 outputs the second detection signal, and the second control module 140 controls the backlight driver chip 200 to output a high-level voltage. At this time, the backlight module emits light normally.

[0063] This embodiment of the application can simultaneously control the state of the operational amplifier 110 and the object connected to the repair line 21 through the first control module 130, and control the light emission state of the backlight module through the second control module 140. This serves two purposes: firstly, if either the first control module 130 or the second control module 140 malfunctions, the other ensures that the problem of the repaired broken data line being too bright will not occur; secondly, the first control module 130 can control the rapid release of parasitic capacitance on the repair line 21, and the second control module 140 can control the backlight to stop emitting light in advance. The combination of these two measures effectively ensures that the brightness of the repaired broken data line is synchronized with other normal data lines, further improving the display effect.

[0064] In some embodiments, the first control module 130 and the second control module 140 can be integrated together and disposed in the timing controller. Of course, in other embodiments, the first control module 130 and the second control module 140 can also be disposed separately.

[0065] In the backlight driver chip 200, LED1-LED6 represent the negative electrodes of the LED string, and the EN port is the enable signal pin. The second control module 140 sends an enable signal to the EN port of the backlight driver chip 200, thereby controlling the backlight brightness through the backlight driver chip 200. In addition, LX represents an external inductor, the PWM port is the pulse width control pin, the MIX port is the mixed dimming signal input pin, the COMP port is the loop compensation pin, the ISET port sets the maximum current for each output channel, the FREQ port is the frequency adjustment pin, and the OVP port is for overvoltage protection.

[0066] like Figure 7 and Figure 8 As shown, in this second embodiment of the present application, a broken wire repair circuit 100 is provided. Compared with the first embodiment, in this embodiment, when the power supply voltage detection module 120 outputs a first detection signal, the first control module 130 controls the repair line 21 to connect to the common electrode VCOM in the display panel 20 to connect the normal data line. Specifically, the input terminal of the second transistor 132 is connected to the common electrode VCOM in the display panel.

[0067] When the display panel is powered off and the power supply voltage DVDD is lower than the preset voltage VT, the source driver chip 31 does not output data voltage, all output channels are short-circuited, and connected to the common electrode VCOM. In this embodiment, the output terminal of the second transistor 132 enables the repair line 21 to be connected to the common electrode VCOM and also to other normal data lines S2. The parasitic capacitance in the repair line 21 can be quickly released, thereby keeping the voltage on the repaired broken data line S1 synchronized with the voltage on other normal data lines S2, thus avoiding the problem that the repaired broken data line S1 is brighter than other normal data lines S2.

[0068] In some embodiments, the disconnection repair circuit 100 further includes a second control module 140. The input terminal of the second control module 140 is connected to the power supply voltage detection module 120, and the output terminal of the second control module 140 is connected to the backlight driver chip 200. When the power supply voltage detection module 120 outputs the first detection signal, the second control module 140 controls the backlight driver chip 200 to output a low-level voltage, controlling the backlight not to emit light. When the power supply voltage detection module 120 outputs the second detection signal, the second control module 140 controls the backlight driver chip 200 to output a high-level voltage, controlling the backlight to emit light.

[0069] Similarly, the first control module 130 includes a first transistor 131 and a second transistor 132. The first detection signal includes a first sub-signal VG1 and a second sub-signal VG2. The first sub-signal VG1 is used to control the first transistor 131 to turn off, and the second sub-signal VG2 is used to control the second transistor 132 to turn on. The second detection signal includes a third sub-signal and a fourth sub-signal. The third sub-signal is used to control the first transistor 131 to turn on, and the fourth sub-signal is used to control the second transistor 132 to turn off.

[0070] In some embodiments, the input terminal of the second transistor 132 is simultaneously connected to the common electrode VCOM in the data output channel and the display panel.

[0071] In some embodiments, the input terminal of the second transistor 132 is connected to both the data output channel and the common electrode VCOM in the display panel, and is also connected to the power supply voltage detection module 120 via the input terminal of the second control module 140.

[0072] like Figure 9 As shown, the third embodiment of this application provides a broken wire repair method, which is used in the broken wire repair circuit described above. The broken wire repair method includes the following steps:

[0073] S1: Identify the broken data line;

[0074] S2: Connect the first end of the broken data line to the non-inverting input of the operational amplifier, and connect the second end of the broken data line to the repair line;

[0075] S3: Detect the power supply voltage via the power supply voltage detection module;

[0076] S41: When the power supply voltage is lower than the preset voltage, the power supply voltage detection module outputs a first detection signal, the operational amplifier stops working, and the repair line is connected to the normal data line;

[0077] S42: When the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module outputs a second detection signal, the operational amplifier operates normally, and the repair line receives the repair voltage.

[0078] Through the design of this application embodiment, during the power-off phase, the parasitic capacitance present on the repair line can be quickly reduced, so that the voltage on the repaired broken data line tends to be consistent with the voltage on the normal data line, thus avoiding brightness differences between the repaired broken data line and the normal data line.

[0079] In this embodiment, the first control module includes a first transistor and a second transistor. The control terminal of the first transistor is connected to the power supply voltage detection module, the input terminal of the first transistor is connected to the power supply port, and the output terminal of the first transistor is connected to the positive power supply terminal of the operational amplifier. The control terminal of the second transistor is connected to the power supply voltage detection module, the input terminal of the second transistor is used to communicate with the normal data line, and the output terminal of the second transistor is connected to the repair line. When the power supply voltage detection module outputs a first detection signal, the first transistor is turned on and the second transistor is turned off. When the power supply voltage detection module outputs a second detection signal, the first transistor is turned off and the second transistor is turned on.

[0080] In step S41, when the power supply voltage detection module outputs a first detection signal, the first transistor is turned on, the second transistor is turned off, and the backlight driver chip is also controlled to output a low-level voltage to prevent the backlight from emitting light. When the power supply voltage detection module outputs a second detection signal, the first transistor is turned off, the second transistor is turned on, and the backlight driver chip is controlled to output a high-level voltage to prevent the backlight from emitting light.

[0081] Simultaneously controlling the state of the operational amplifier and the object connected to the repair line, as well as controlling the light emission state of the backlight module, serves as a double insurance measure and effectively ensures that the brightness of the repaired broken data line is synchronized with other normal data lines, further improving the display effect.

[0082] It should be noted that the limitations of each step involved in this solution are not considered as limiting the order of steps, provided that they do not affect the implementation of the specific solution. The steps listed first can be executed first, later, or even simultaneously. Solutions from different embodiments can be combined and applied without conflict. As long as this solution can be implemented, they should be considered to fall within the protection scope of this application.

[0083] The above description, in conjunction with specific optional embodiments, provides a further detailed explanation of this application and should not be construed as limiting the specific implementation of this application to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of this application, and all such modifications or substitutions should be considered within the scope of protection of this application.

Claims

1. A broken wire repair circuit for repairing broken data lines in a display panel, characterized in that, The broken wire repair circuit includes: An operational amplifier, wherein the non-inverting input terminal of the operational amplifier is connected to a first end of a broken data line to receive a data voltage supplied to the broken data line; the output terminal of the operational amplifier is connected to a second end of the broken data line via a repair line to provide a repair voltage to the second end of the broken data line; and the inverting input terminal of the operational amplifier is connected to the output terminal of the operational amplifier. A power supply voltage detection module, connected to a power source, is used to detect the power supply voltage. When the power supply voltage is lower than a preset voltage, the power supply voltage detection module outputs a first detection signal; when the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module outputs a second detection signal; and A first control module is connected to the power supply voltage detection module, the operational amplifier, and the repair line. When the power supply voltage detection module outputs a first detection signal, the first control module controls the operational amplifier to stop working and controls the repair line to connect with the normal data line. When the power supply voltage detection module outputs a second detection signal, the first control module controls the operational amplifier to work normally and controls the repair line to receive the repair voltage. The first control module includes a first transistor and a second transistor. The control terminal of the first transistor is connected to the power supply voltage detection module, the input terminal of the first transistor is connected to the power supply port, and the output terminal of the first transistor is connected to the positive power supply terminal of the operational amplifier. The control terminal of the second transistor is connected to the power supply voltage detection module, the input terminal of the second transistor is used to communicate with the normal data line, and the output terminal of the second transistor is connected to the repair line. The first detection signal includes a first sub-signal and a second sub-signal, wherein the first sub-signal is used to control the first transistor to turn off and the second sub-signal is used to control the second transistor to turn on; the second detection signal includes a third sub-signal and a fourth sub-signal, wherein the third sub-signal is used to control the first transistor to turn on and the fourth sub-signal is used to control the second transistor to turn off.

2. The broken wire repair circuit as described in claim 1, characterized in that, When the power supply voltage detection module outputs the first detection signal, the first control module controls the repair line to connect with the data output channel corresponding to the broken data line so as to connect the normal data line.

3. The broken wire repair circuit as described in claim 1, characterized in that, When the power supply voltage detection module outputs the first detection signal, the first control module controls the repair line to connect to the common electrode in the display panel to connect the normal data line.

4. The broken wire repair circuit as described in claim 1, characterized in that, The first transistor and the second transistor are of different types, the first sub-signal and the second sub-signal are the same signal, and the third sub-signal and the fourth sub-signal are the same signal.

5. The broken wire repair circuit as described in claim 1, characterized in that, The broken wire repair circuit also includes a second control module. The input terminal of the second control module is connected to the power supply voltage detection module, and the output terminal of the second control module is used to connect to the backlight driver chip. When the power supply voltage detection module outputs the first detection signal, the second control module controls the backlight driver chip to output a low-level voltage, controlling the backlight not to emit light; when the power supply voltage detection module outputs the second detection signal, the second control module controls the backlight driver chip to output a high-level voltage, controlling the backlight to emit light.

6. A method for repairing broken wires, used in the broken wire repair circuit as described in any one of claims 1-5, characterized in that, The broken wire repair method includes the following steps: Identify the broken data cable; Connect the first end of the broken data line to the non-inverting input of the operational amplifier, and connect the second end of the broken data line to the repair line; The power supply voltage is detected by the power supply voltage detection module; as well as When the power supply voltage is lower than the preset voltage, the power supply voltage detection module outputs a first detection signal, the operational amplifier stops working, and the repair line is connected to the normal data line; when the power supply voltage is greater than or equal to the preset voltage, the power supply voltage detection module outputs a second detection signal, the operational amplifier works normally, and the repair line receives the repair voltage.

7. The method for repairing broken wires as described in claim 6, characterized in that, The first control module includes a first transistor and a second transistor. The control terminal of the first transistor is connected to the power supply voltage detection module, the input terminal of the first transistor is connected to the power supply port, and the output terminal of the first transistor is connected to the positive power supply terminal of the operational amplifier. The control terminal of the second transistor is connected to the power supply voltage detection module, the input terminal of the second transistor is used to communicate with the normal data line, and the output terminal of the second transistor is connected to the repair line. When the power supply voltage detection module outputs a first detection signal, the first transistor is turned on and the second transistor is turned off; when the power supply voltage detection module outputs a second detection signal, the first transistor is turned off and the second transistor is turned on.

8. The method for repairing broken wires as described in claim 6, characterized in that, When the power supply voltage detection module outputs the first detection signal, it also controls the backlight driver chip to output a low-level voltage, controlling the backlight not to emit light; when the power supply voltage detection module outputs the second detection signal, it controls the backlight driver chip to output a high-level voltage, controlling the backlight to emit light.

9. A display device, characterized in that, include: The display panel includes multiple parallel data lines; as well as The broken wire repair circuit as described in any one of claims 1-5 is used to repair broken data lines in the display panel.

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