CN117784482A - Broken wire repair circuit, display panel and broken wire repair method - Google Patents

Abstract

The application provides a broken wire repair circuit, a display panel and a broken wire repair method. The broken line repair circuit comprises an operational amplifier and a square wave generating circuit and is used for repairing the data line of the broken line of the display panel. When the data line arranged in the display area is broken, the broken line repair circuit can be connected with the broken data line, and further, the compensation voltage waveform generated by the square wave generating circuit can be input to the positive input end of the operational amplifier, so that the operational amplifier can accumulate the gray scale voltage waveform and the compensation voltage waveform and then output the accumulated gray scale voltage waveform and the compensation voltage waveform to the broken data line, and waveform distortion of the data line which is output to the broken line and is caused by overlong repair line and overlarge resistance-capacitance load can be reduced in the repair process, and the display effect is improved.

Description

Broken wire repair circuit, display panel and broken wire repair method

Technical Field

The application relates to the technical field of display equipment, in particular to a broken wire repair circuit, a display panel and a broken wire repair method.

Background

In the manufacturing process of a panel of a liquid crystal display (Liquid Crystal Display, LCD), the data lines are often broken inside the panel due to some bad reasons, and obvious bright lines (or dark lines) appear after the panel is powered on.

In order to solve the above problems, the related art provides a technical solution, in which a data driving output channel corresponding to the broken line is pulled to a printed circuit board (PrintedCircuit Board, abbreviated as PCB) by means of laser bonding wires, and then passed through a Buffer (OP Buffer) and then passed through a test line reserved in the panel to the other side of the panel, and the test line and the other section of the broken line are conducted by means of laser bonding wires, and the display of the other section of the broken line can be charged by the test line, so that the defect of the line can be changed into a dot defect, and the display quality of the liquid crystal display is not greatly affected by the defect of the dot. However, this repair method requires to pull wires to the printed circuit board, so that the routing length of the data line is significantly increased, and the resistance-capacitance load (RC loading) of the line is increased, so that a run buffer is required to be added to the printed circuit board to drive the broken wire. Along with the continuous development of the liquid crystal display panel towards large size, the length of the wiring is increased, so that the resistance-capacitance load on the wiring is increased, the waveform of the voltage output to the broken data line is distorted, and the charging of partial sub-pixels on the broken data line is insufficient, thereby influencing the display effect.

Disclosure of Invention

The embodiment of the application mainly aims to provide a broken wire repairing circuit, a display panel and a broken wire repairing method. The compensation voltage waveform generated by the square wave generating circuit is input to the positive electrode input end of the operational amplifier, so that the operational amplifier can accumulate the gray-scale voltage waveform and the compensation voltage waveform and then output the accumulated gray-scale voltage waveform and the accumulated compensation voltage waveform to the broken data line, waveform distortion of the data line which is output to the broken data line due to overlong repair line can be reduced in the repair process, and the display effect is improved.

In order to achieve the above object, a first aspect of an embodiment of the present application provides a broken line repair circuit for repairing a data line of a broken line of a display panel, where the broken line repair circuit includes an operational amplifier and a square wave generating circuit;

the positive electrode input end of the operational amplifier is used for being connected with the first end of the broken data line so as to receive a gray scale voltage waveform applied to the data line;

the square wave generating circuit is used for generating a compensation voltage waveform, the output end of the square wave generating circuit is connected with the positive electrode input end of the operational amplifier so as to transmit the compensation voltage waveform to the operational amplifier, and the period of the compensation voltage waveform is the same as that of the gray scale voltage waveform;

the output end of the operational amplifier is used for being connected with the second end of the broken data line so as to accumulate the compensation voltage waveform and the gray-scale voltage waveform and then transmit the accumulated compensation voltage waveform and the gray-scale voltage waveform to the broken data line so as to repair the broken data line.

In one embodiment of the present application, the positive power supply pin of the operational amplifier is connected to a first positive voltage, and the negative power supply pin of the operational amplifier is connected to a first negative voltage, where the first positive voltage is greater than a sum of an absolute value of a peak of the gray scale voltage waveform and an absolute value of a peak of the compensation voltage waveform.

In one embodiment of the present application, the broken wire repair circuit further includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

the first resistor is connected between a first end of the broken data line and the positive input end of the operational amplifier, and the second resistor is connected between the output end of the square wave generating circuit and the positive input end of the operational amplifier; the positive electrode input end of the operational amplifier is grounded after passing through the third resistor, the negative electrode input end of the operational amplifier is grounded after passing through the fourth resistor, and the negative electrode input end of the operational amplifier is connected to the output end of the operational amplifier after passing through the fifth resistor; the resistance of the first resistor, the resistance of the second resistor, the resistance of the third resistor and the resistance of the fourth resistor are equal.

A second aspect of an embodiment of the present application proposes a display panel, including:

the display device comprises a display area and a non-display area surrounding the display area, wherein the display area is provided with a plurality of data lines which are arranged at intervals;

the broken wire repair circuit of any embodiment of the present application, wherein an anode input end of the operational amplifier in the broken wire repair circuit is used for connecting a first end of the broken data line; the output end of the operational amplifier is used for being connected with the second end of the broken data line so as to repair the broken data line.

In one embodiment of the present application, the non-display area is provided with a first repair line and a second repair line, the first repair line is connected with a first end of the broken data line, and the second repair line is connected with a second end of the broken data line;

the positive electrode input end of the operational amplifier is connected with the first end of the broken data line through the first repair line;

and the output end of the operational amplifier is connected with the second end of the broken data line through the second repair line.

A third aspect of the embodiments of the present application provides a wire breakage repairing method, which is executed by using the wire breakage repairing circuit described in any one of the embodiments of the present application, where the method includes:

determining a compensation voltage waveform, wherein the period of the compensation voltage waveform is the same as the period of the gray scale voltage waveform;

and controlling the square wave generating circuit to generate the compensation voltage waveform, so that the operational amplifier adds up the compensation voltage waveform and the gray scale voltage waveform and then transmits the accumulated compensation voltage waveform and the gray scale voltage waveform to the broken data line so as to repair the broken data line.

In one embodiment of the present application, determining the compensation voltage waveform includes:

under the condition that the output end of the operational amplifier outputs gray-scale voltage waveforms, simulating first voltage waveforms output to the broken data lines according to a resistance-capacitance load on a connection line between the output end of the operational amplifier and the second end of the broken data lines;

adjusting the peak value of the first voltage waveform to obtain a second voltage waveform, wherein the peak value of the second voltage waveform is equal to the peak value of the gray scale voltage waveform;

according to the second voltage waveform and the resistance-capacitance load, reversely pushing to obtain a target voltage waveform to be output by the output end of the operational amplifier;

and subtracting the gray-scale voltage waveform from the target voltage waveform to obtain a compensation voltage waveform.

In one embodiment of the present application, after controlling the square wave generating circuit to generate the compensation voltage waveform, the method includes:

detecting whether the display state of the display panel meets the preset requirement;

and if the display state of the display panel does not meet the preset requirement, controlling the square wave generating circuit to adjust the peak value of the compensation voltage waveform until the display state of the display panel meets the preset requirement.

In one embodiment of the present application, the determining the compensation voltage waveform includes:

controlling the square wave generating circuit to generate a preset voltage waveform, and detecting whether the display state of the display panel meets the preset requirement, wherein the period of the preset voltage waveform is the same as the period of the gray scale voltage waveform;

when the display state of the display panel meets the preset requirement, taking the preset voltage waveform as a compensation voltage waveform;

and when the display state of the display panel does not meet the preset requirement, controlling the square wave generating circuit to adjust the peak value of the preset voltage waveform until the display state of the display panel meets the preset requirement.

In one embodiment of the present application, before acquiring the compensation voltage waveform, the method further comprises:

when the broken data line in the display panel is detected, the first end of the broken data line is connected with the positive electrode input end of the operational amplifier through a first repair line, and the output end of the operational amplifier is connected with the second end of the broken data line through a second repair line.

In the technical scheme provided by the embodiment of the application, the broken line repair circuit comprises an operational amplifier and a square wave generating circuit and is used for repairing the data line of the broken line of the display panel. When the data line arranged in the display area is broken, the broken line repair circuit can be connected with the broken data line, and further, the compensation voltage waveform generated by the square wave generating circuit can be input to the positive input end of the operational amplifier, so that the operational amplifier can accumulate the gray scale voltage waveform and the compensation voltage waveform and then output the accumulated gray scale voltage waveform and the compensation voltage waveform to the broken data line, and waveform distortion of the data line which is output to the broken line and is caused by overlong repair line and overlarge resistance-capacitance load can be reduced in the repair process, and the display effect is improved.

Drawings

FIG. 1 is a schematic diagram of a pixel architecture of a liquid crystal display;

fig. 2 is a schematic diagram of a wire breakage repairing circuit according to an embodiment of the present disclosure;

fig. 3 is a circuit diagram of a broken wire repair circuit provided in an embodiment of the present application;

FIG. 4 is a circuit example diagram of a square wave generation circuit;

FIG. 5 is a schematic waveform diagram of a square wave generating circuit;

fig. 6 is a flowchart of a broken wire repairing method provided in an embodiment of the present application;

FIG. 7 is a flowchart of steps for determining a compensation voltage waveform provided by an embodiment of the present application;

fig. 8 is a schematic waveform diagram of an output end of an operational amplifier according to an embodiment of the present application outputting only gray scale voltage waveforms;

FIG. 9 is a schematic diagram of an adjusted repair waveform provided by an embodiment of the present application;

FIG. 10 is a flowchart illustrating steps performed after the control square wave generating circuit according to the embodiment of the present application generates a compensation voltage waveform;

fig. 11 is a flowchart of steps for determining a compensation voltage waveform provided in an embodiment of the present application.

Reference numerals:

a display area-10; a non-display area-20; a data line-11; a first repair line-211; a second repair line-212; a broken wire repair circuit-40; an operational amplifier-41; square wave generating circuit-42.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It should be noted that although functional block division is performed in a device diagram and a logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.

In the liquid crystal display, the horizontal direction is opened row by row, and the vertical direction is charged by driving a data Line (Source Line). The horizontal array substrate gate driving circuit (GOA circuit) is driven by a left-right dual driving mode, the vertical direction is driven by a Source Driver (Source Driver) chip, the Source Driver receives display data transmitted from the front end and performs more complex data processing, then performs digital-to-analog conversion (DAC conversion) to generate gray scale voltages, the gray scale voltages are transmitted to the in-plane driving mode for display, the Source Driver chip has high cost and is convenient for transmitting the display data, and the display data is usually driven by a single side, as shown in fig. 1, and fig. 1 is a schematic diagram of a pixel architecture of a liquid crystal display.

However, in the manufacturing process, the data lines inside the lcd panel inevitably have broken lines due to the process, resulting in poor contact and increased impedance, which in turn results in black lines, lines of weakness, etc. In order to solve the data line breakage defect, the data line breakage is usually repaired. The existing repairing method needs to pull wires to the printed circuit board, so that the wiring length of the data wire is obviously increased, the sub-pixels of the wire breaking part are not charged enough, namely, the target gray level voltage level cannot be charged in the charging time, and obvious demarcation difference exists in display.

Based on this, the embodiment of the application provides a broken line repair circuit, which generates a compensation voltage waveform through a square wave generating circuit and inputs the compensation voltage waveform to the positive electrode input end of an operational amplifier, so that the operational amplifier can accumulate the gray scale voltage waveform and the compensation voltage waveform and then output the accumulated gray scale voltage waveform to a broken line data line, thereby reducing waveform distortion of the data line which is output to the broken line due to overlong repair line in the repair process and improving the display effect.

Referring to fig. 2-3, fig. 2 is a schematic diagram of a wire breakage repairing circuit according to an embodiment of the present application. Fig. 3 is a circuit diagram of a broken wire repair circuit provided in an embodiment of the present application. As shown in fig. 2, the display panel includes a display area 10 and a non-display area 20 surrounding the display area, and the display area 10 is provided with a plurality of data lines 11 arranged at intervals. As shown in fig. 3, the wire break repair circuit 40 includes an operational amplifier 41 and a square wave generating circuit 42.

When a line break occurs in the data line 11 (BE in the drawing) in the display area 10, the break point is a to divide the data line 11 (BE in the drawing) into a first segment BA and a second segment AE. At this time, one end (i.e., point B) of the first segment BA of the broken data line 11 may be connected to the positive input terminal a of the operational amplifier 41. Thus, the gray scale voltage waveform applied to the data line 11 can be transmitted to the operational amplifier 41 through the operational amplifier 41. Meanwhile, the output terminal of the square wave generating circuit 42 is connected to the positive input terminal a of the operational amplifier 41. So that the compensation voltage waveform generated by the square wave generating circuit 42 can be transmitted to the operational amplifier 41. The output terminal c of the operational amplifier 41 is connected to one end (i.e., point E) of the second section AE of the broken data line 11. Thus, since the period of the compensation voltage waveform is the same as the period of the gray scale voltage waveform, the operational amplifier 41 can accumulate the compensation voltage waveform and the gray scale voltage waveform and transmit the accumulated compensation voltage waveform and the gray scale voltage waveform to the broken data line 11, so as to repair the broken data line 11.

In this embodiment of the present application, considering that when the gray-scale voltage waveform is only transmitted to the broken data line 11 through the operational amplifier 41 for repairing, due to the increase of the repairing line, the corresponding resistance-capacitance (RC) load increases, so that the voltage waveform on the sub-pixel corresponding to the broken data line 11 is distorted, and the sub-pixel is not fully charged, i.e. the charging time is not fully charged to the target gray-scale voltage level, and there is still an obvious demarcation difference during display. Therefore, the broken wire repairing circuit according to the embodiment of the present application further includes a square wave generating circuit 42, and an output of the square wave generating circuit 42 is connected to the positive input terminal a of the operational amplifier 41. The square wave generating circuit 42 is used to generate a compensation voltage waveform, so that the compensation voltage waveform generated by the square wave generating circuit 42 can be input into the operational amplifier 41. Therefore, the operational amplifier 41 can accumulate the gray-scale voltage waveform and the compensation voltage waveform and output the accumulated gray-scale voltage waveform and the compensation voltage waveform to the broken data line 11, so that waveform distortion of the data line 11 which is output to the broken data line due to overlong repair line can be reduced, and display effect can be improved.

It should be noted that the compensation voltage waveform generated by the square wave generating circuit 42 can be determined by the following steps:

step one: under the condition that the output end of the operational amplifier outputs gray-scale voltage waveforms, according to the resistance-capacitance load on the second repair line, simulating the first voltage waveform of the data line which is output to the broken line;

step two: adjusting the peak value of the first voltage waveform to obtain a second voltage waveform, wherein the peak value of the second voltage waveform is equal to the peak value of the gray scale voltage waveform;

step three: according to the second voltage waveform and the resistance-capacitance load on the second repair line, reversely pushing to obtain a target voltage waveform to be output by the output end of the operational amplifier;

step four: and subtracting the gray-scale voltage waveform from the target voltage waveform to obtain a compensation voltage waveform.

After the compensation voltage waveform is determined, the compensation voltage waveform is generated by the square wave generating circuit 42 and is input into the operational amplifier 41, so that the operational amplifier 41 can accumulate the gray-scale voltage waveform and the compensation voltage waveform and output the accumulated gray-scale voltage waveform to the broken data line 11, repair of the broken data line is realized, and waveform distortion of the data line 11 output to the broken data line due to overlong repair line can be reduced.

In this embodiment, the signal of the first segment BA of the broken data line 11 (BE in the illustration) shown in fig. 2, which is one end of the data line 11 near the signal input end, is directly provided by the source driver chip, that is, after the first segment BA of the broken data line 11 is communicated with the positive input end a of the operational amplifier 41, the first segment BA of the broken data line 11 can BE directly driven. The sub-pixel of the region corresponding to the first segment BA of the data line 11 may be normally displayed. The signal of the second section AE of the broken data line 11 shown in fig. 3, which is the end of the data line 11 far from the signal input end, is generated after the signal output by the source driving chip passes through the operational amplifier 41. That is, after the second section AE of the broken data line 11 is connected to the broken repair circuit shown in fig. 3, the broken repair circuit may drive the second section AE of the broken data line 11. The sub-pixel of the area corresponding to the second segment AE of the data line 11 may also be displayed normally.

In one embodiment of the present application, as shown in fig. 3, the positive power supply pin of the operational amplifier 41 is connected to a first positive voltage +vcc, and the negative power supply pin of the operational amplifier 41 is connected to a first negative voltage-VCC. Wherein the first positive voltage +VCC is greater than the sum of the absolute value of the peak value of the gray scale voltage waveform and the absolute value of the peak value of the compensation voltage waveform.

Illustratively, the first positive voltage VCC is typically around 16V, the data lines are for transmitting gray-scale voltage data, the positive gray-scale voltage is typically about 8-14.5V, and the negative gray-scale voltage is typically about 1-7.5V. The high-brush or large-size display panel usually performs polarity switching once every frame, and enough time is left between two frames to charge and switch polarity, so that the brightest and darkest switching of adjacent rows, namely 8V-14.5V-8V-14.5V or 1V-7.5V-1V-7.5V, is more difficult to charge.

In this embodiment of the present application, considering that the positive input terminal a of the operational amplifier 41 is connected to the gray-scale voltage waveform and the compensation voltage waveform generated by the square wave generating circuit 42, the operational amplifier 41 needs to accumulate the gray-scale voltage waveform and the compensation voltage waveform, so that the first positive voltage +vcc connected to the positive power pin of the operational amplifier 41 is greater than the sum of the absolute peak value of the gray-scale voltage waveform and the absolute peak value of the compensation voltage waveform. Meanwhile, since the operational amplifier 41 may output a negative voltage condition, the negative power pin of the operational amplifier 41 needs to be supplied with power from the connection Ground (GND) to the connection first negative voltage-VCC.

In one embodiment of the present application, as shown in fig. 3, the broken wire repair circuit further includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. Wherein:

the first resistor R1 is connected between the first end of the broken data line 11 and the positive input terminal a of the operational amplifier 41, and the second resistor R2 is connected between the output terminal of the square wave generating circuit 42 and the positive input terminal a of the operational amplifier 41. The positive input terminal a of the operational amplifier 41 is further grounded GND through the third resistor R3, the negative input terminal b of the operational amplifier 41 is grounded GND through the fourth resistor R4, and the negative input terminal b of the operational amplifier 41 is further connected to the output terminal c of the operational amplifier 41 through the fifth resistor R5. The resistance of the first resistor R1, the resistance of the second resistor R2, the resistance of the third resistor R3, and the resistance of the fourth resistor R4 are equal.

In the embodiment of the present application, referring to fig. 4 to 5, fig. 4 is a circuit example diagram of a square wave generating circuit, and fig. 5 is a waveform schematic diagram of the square wave generating circuit. As shown in fig. 4 and 5, the amplitude Uom = ±uz of the square wave, the period t=2r3cln (1+2r1/R2). It can be seen that the period of the compensation voltage waveform generated by the square wave generating circuit can be adjusted to be consistent with the period of the gray scale voltage waveform by adjusting the resistors R1, R2, R3 and the capacitor C in the square wave generating circuit. The compensation voltage of different breakpoints can be satisfied by adjusting the UZ.

In one embodiment of the present application, referring to fig. 2, the present application further proposes a display panel, including:

a display area 10 and a non-display area 20 surrounding the display area 10, the display area 10 being provided with a plurality of data lines 11 arranged at intervals;

the broken wire repair circuit 40 provided in any embodiment of the present application, the positive input terminal a of the operational amplifier 41 in the broken wire repair circuit 40 is used for connecting the first end (i.e. the point B in the diagram) of the broken data line 11; the output terminal c of the operational amplifier is used for connecting the second terminal (e.g. point E in the drawing) of the broken data line 11 to repair the broken data line 11.

The display panel in this embodiment of the application includes a broken line repair circuit 40, where the broken line repair circuit 40 may be connected with a broken data line, so as to repair the broken data line. The square wave generating circuit can generate a compensation voltage waveform and can input the generated compensation voltage waveform to the positive electrode input end of the operational amplifier, so that the operational amplifier can accumulate the gray-scale voltage waveform and the compensation voltage waveform and then output the accumulated gray-scale voltage waveform and the compensation voltage waveform to the broken data line, waveform distortion of the data line which is output to the broken data line and is caused by overlong repair line and overlarge resistance-capacitance load can be reduced in the repair process, and the display effect is improved.

In one embodiment of the present application, referring to fig. 2, the non-display area 20 is provided with a first repair line 211 and a second repair line 212, wherein the first repair line 211 is connected to a first end (i.e. point B in the drawing) of the broken data line 11, and the second repair line 212 is connected to a second end (i.e. point E in the drawing) of the broken data line 11. The positive input terminal a of the operational amplifier 41 is connected to a first end (i.e., point B in the drawing) of the broken data line 11 through the first repair line 211. The output terminal c of the operational amplifier 41 is connected to the second terminal (i.e. point E in the drawing) of the broken data line 11 through the second repair line 212.

In this embodiment, the display panel further includes a printed circuit board, the broken wire repair circuit 40 is disposed On the printed circuit board, a Chip On Film (COF for short) is disposed above the display panel, and a first end (i.e., a point B in the drawing) of the broken data line 11 is connected to the broken wire repair circuit 40 On the printed circuit board through the first repair line 211 passing through the Chip On Film. The second end of the broken data line 11 (i.e., point E as shown) is connected to the broken repair circuit 40 on the printed circuit board via a second repair line 212.

In this embodiment of the present application, since the non-display area 20 of the display panel is provided with the first repair line 211 and the second repair line 212, when the data line is broken, the data line is directly connected with the broken line repair circuit 40 through the first repair line 211 and the second repair line 212, so that the connection is convenient, the wiring design is not required, and the repair rate can be improved.

In one embodiment of the present application, referring to fig. 6, an embodiment of the present application further provides a flowchart of a wire breakage repairing method, which is performed by the wire breakage repairing circuit according to any embodiment of the present application, including but not limited to steps S610 to S620.

In step S610, a compensation voltage waveform is determined, and the period of the compensation voltage waveform is the same as the period of the gray scale voltage waveform.

In this embodiment of the present application, considering that when the gray-scale voltage waveform is only transmitted to the broken data line 11 through the operational amplifier 41 for repairing, due to the increase of the repairing line, the corresponding resistance-capacitance (RC) load increases, so that the voltage waveform on the sub-pixel corresponding to the broken data line 11 is distorted, and the sub-pixel is not fully charged, i.e. the charging time is not fully charged to the target gray-scale voltage level, and there is still an obvious demarcation difference during display. Therefore, the embodiment of the present application needs to generate the compensation voltage waveform by the square wave generating circuit 42 and transmit the compensation voltage waveform to the operational amplifier 41, that is, the compensation voltage waveform generated by the square wave generating circuit 42, so as to eliminate the waveform distortion caused by the repair line rc load.

In one embodiment of the present application, referring to fig. 7, fig. 7 is a flowchart of steps provided in embodiments of the present application for determining a compensation voltage waveform, including but not limited to steps S710 to S740.

Step S710, under the condition that the output end of the operational amplifier outputs the gray-scale voltage waveform, simulating the first voltage waveform of the data line which is output to the broken line according to the resistance-capacitance load on the second repair line;

step S720, adjusting the peak value of the first voltage waveform to obtain a second voltage waveform, wherein the peak value of the second voltage waveform is equal to the peak value of the gray scale voltage waveform;

step S730, reversely pushing to obtain a target voltage waveform to be output by the output end of the operational amplifier according to the second voltage waveform and the resistance-capacitance load on the second repair line;

step S740, subtracting the gray voltage waveform from the target voltage waveform to obtain a compensation voltage waveform.

In the embodiment of the present application, referring to fig. 8, fig. 8 is a schematic diagram of the output end of the operational amplifier provided in the embodiment of the present application outputting only the gray scale voltage waveform under the condition that the output end of the operational amplifier 41 only outputs the gray scale voltage waveform. As shown in fig. 8, waveform 1 is a gray scale voltage waveform, waveform 2 overlaps waveform 1, waveform 2 is a voltage waveform corresponding to the output terminal of the operational amplifier 41, and waveform 3 is a first voltage waveform corresponding to the second terminal of the data line input to the disconnection. The waveform 3 is a first voltage waveform which is simulated to be output to the broken data line according to the resistance-capacitance load on the second repair line. As shown in fig. 8, under the condition that only the gray-scale voltage waveform is output from the output end of the operational amplifier 41, the distortion condition occurs in the first voltage waveform corresponding to the second end of the broken data line, which results in insufficient charging of the sub-pixel corresponding to the second end of the broken data line (AE in the drawing), that is, the charging time is not up to the target gray-scale voltage level, and there is still a significant demarcation difference during display. Thus, if an effective repair of the broken data line is required, the distortion of the first voltage waveform needs to be eliminated. Referring to fig. 9, fig. 9 is a schematic diagram of an adjusted repair waveform according to an embodiment of the present application. As shown in fig. 9, waveform 1 is a gray scale voltage waveform, waveform 3 is a first voltage waveform, waveform 4 is a second voltage waveform, waveform 5 is a target voltage waveform, and waveform 6 is a compensation voltage waveform. In this embodiment, the peak value of the first voltage waveform is adjusted to obtain a second voltage waveform (e.g. waveform 4), where the peak value of the second voltage waveform is equal to the peak value of the gray voltage waveform. And then, reversely pushing to obtain a target voltage waveform (such as waveform 5) which needs to be output by the output end of the operational amplifier according to the second voltage waveform and the resistance-capacitance load on the second repair line. Thereby subtracting the gray scale voltage waveform from the target voltage waveform to obtain a compensation voltage waveform (e.g., waveform 6). Specifically, in the embodiment of the present application, in order to improve the repairing effect, so that there is no obvious difference between before and after repairing, the waveform 3 needs to be adjusted to the waveform 4, and the output of the operational amplifier needs to be changed to the waveform 5 to eliminate the resistive-capacitive load of the repairing line when adjusted to the waveform 4, so that the waveform 5 needs to be changed from the original waveform 1 to the current position of the waveform 5, and the waveform 6 can be obtained by subtracting the waveform 1 from the waveform 5.

In one embodiment of the present application, referring to fig. 10, fig. 10 is a flowchart of steps performed after the control square wave generating circuit provided in the embodiment of the present application generates the compensation voltage waveform, including but not limited to steps S1010 to S1020.

Step S1010, detecting whether the display state of the display panel meets the preset requirement;

in step S1020, if the display status of the display panel does not meet the preset requirement, the square wave generating circuit is controlled to adjust the peak value of the compensation voltage waveform until the display status of the display panel meets the preset requirement.

In the embodiment of the application, after the square wave generating circuit is controlled to generate the compensation voltage waveform, the broken data line can be effectively repaired. However, considering that the compensation voltage waveform is obtained by reversely pushing the target voltage waveform to be output at the output end of the operational amplifier after being adjusted based on the first voltage waveform which is output to the broken data line and according to the resistance-capacitance load on the second repair line, in order to verify whether the theoretical value can effectively eliminate waveform distortion caused by the resistance-capacitance load of the repair line, after the square wave generating circuit is controlled to generate the compensation voltage waveform, whether the display state of the display panel meets the preset requirement can be further detected, if the display state of the display panel meets the preset requirement, the compensation voltage waveform obtained by speculation is accurate, and the gray-scale voltage waveform and the compensation voltage waveform are accumulated by the operational amplifier and then output to the broken data line, so that waveform distortion caused by the resistance-capacitance load of the repair line can be effectively eliminated. If the display state of the display panel does not meet the preset requirement, the square wave generating circuit is required to be controlled to adjust the peak value of the compensation voltage waveform, and the adjusted compensation voltage waveform can be ensured to effectively eliminate waveform distortion caused by the resistance-capacitance load of the repair line until the display state of the display panel meets the preset requirement.

In one embodiment of the present application, referring to fig. 11, fig. 11 is a flowchart of steps provided in an embodiment of the present application for determining a compensation voltage waveform, including but not limited to steps S1110 to S1130.

Step S1110, controlling a square wave generating circuit to generate a preset voltage waveform, and detecting whether the display state of the display panel meets the preset requirement, wherein the period of the preset voltage waveform is the same as the period of the gray scale voltage waveform;

step S1120, when the display state of the display panel meets the preset requirement, taking the preset voltage waveform as the compensation voltage waveform;

in step S1130, when the display status of the display panel does not meet the preset requirement, the square wave generating circuit is controlled to adjust the peak value of the preset voltage waveform until the display status of the display panel meets the preset requirement.

In this embodiment, as another method for determining the compensation voltage waveform, the square wave generating circuit is controlled to generate a preset voltage waveform, and whether the display state of the display panel meets the preset requirement is detected. The period of the preset voltage waveform is the same as the period of the gray scale voltage waveform. When the display state of the display panel meets the preset requirement, the preset voltage waveform is used as the compensation voltage waveform. And if the display state of the display panel does not meet the preset requirement, controlling the square wave generating circuit to adjust the peak value of the preset voltage waveform until the display state of the display panel meets the preset requirement.

In the embodiment of the application, whether the preset voltage waveform generated by the square wave generating circuit is the final compensation voltage waveform can be determined by detecting whether the display state of the display panel meets the preset requirement. And the peak value of the preset voltage waveform can be adjusted to enable the display state of the display panel to meet the preset requirement, so that the final compensation voltage waveform can be determined.

In one embodiment of the present application, before acquiring the compensation voltage waveform, the repairing method further includes:

when the broken data line in the display panel is detected, the first end of the broken data line is connected with the positive electrode input end of the operational amplifier through the first repair line, and the output end of the operational amplifier is connected with the second end of the broken data line through the second repair line.

In this embodiment, after the position of the broken data line can be found and located by using the detection device, the first end of the broken data line is connected with the positive input end of the operational amplifier through the first repair line, and the output end of the operational amplifier is connected with the second end of the broken data line through the second repair line. Therefore, the broken data line can be connected with the broken repair circuit through the first repair line and the second repair line, and the broken data line can be repaired by the broken repair circuit.

And S620, controlling the square wave generating circuit to generate a compensation voltage waveform so that the operational amplifier can accumulate the compensation voltage waveform and the gray scale voltage waveform and then transmit the accumulated compensation voltage waveform and the gray scale voltage waveform to the broken data line so as to repair the broken data line.

In the embodiment of the application, the compensation voltage waveform generated by the square wave generating circuit is input to the positive electrode input end a of the operational amplifier, and the gray scale voltage waveform is also input to the positive electrode input end a of the operational amplifier, so that the operational amplifier can accumulate the compensation voltage waveform and the gray scale voltage waveform and then transmit the accumulated compensation voltage waveform and the gray scale voltage waveform to the broken data line, repair the broken data line, reduce waveform distortion of the data line which is output to the broken data line due to overlong repair line and overlarge resistance-capacitance load, and improve the display effect.

The embodiments described in the embodiments of the present application are for more clearly describing the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application, and as those skilled in the art can know that, with the evolution of technology and the appearance of new application scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

It will be appreciated by those skilled in the art that the technical solutions shown in the figures do not constitute limitations of the embodiments of the present application, and may include more or fewer steps than shown, or may combine certain steps, or different steps.

The above described apparatus embodiments are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

Those of ordinary skill in the art will appreciate that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof.

The terms "first," "second," "third," "fourth," and the like in the description of the present application and in the above-described figures, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It should be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "and/or" for describing the association relationship of the association object, the representation may have three relationships, for example, "a and/or B" may represent: only a, only B and both a and B are present, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the above-described division of units is merely a logical function division, and there may be another division manner in actual implementation, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including multiple instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing a program.

Preferred embodiments of the present application are described above with reference to the accompanying drawings, and thus do not limit the scope of the claims of the embodiments of the present application. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the embodiments of the present application shall fall within the scope of the claims of the embodiments of the present application.

Claims (10)

1. The broken line repair circuit is used for repairing the data line of the broken line of the display panel and is characterized by comprising an operational amplifier and a square wave generating circuit;

the positive electrode input end of the operational amplifier is used for being connected with the first end of the broken data line so as to receive a gray scale voltage waveform applied to the data line;

the square wave generating circuit is used for generating a compensation voltage waveform, the output end of the square wave generating circuit is connected with the positive electrode input end of the operational amplifier so as to transmit the compensation voltage waveform to the operational amplifier, and the period of the compensation voltage waveform is the same as that of the gray scale voltage waveform;

the output end of the operational amplifier is used for being connected with the second end of the broken data line so as to accumulate the compensation voltage waveform and the gray-scale voltage waveform and then transmit the accumulated compensation voltage waveform and the gray-scale voltage waveform to the broken data line so as to repair the broken data line.

2. The broken wire repair circuit of claim 1, wherein the positive power supply pin of the operational amplifier is connected to a first positive voltage and the negative power supply pin of the operational amplifier is connected to a first negative voltage, the first positive voltage being greater than a sum of an absolute value of a peak of the gray scale voltage waveform and an absolute value of a peak of the compensation voltage waveform.

3. The wire break repair circuit of claim 1, further comprising a first resistor, a second resistor, a third resistor, a fourth resistor, and a fifth resistor;

the first resistor is connected between a first end of the broken data line and the positive input end of the operational amplifier, and the second resistor is connected between the output end of the square wave generating circuit and the positive input end of the operational amplifier;

the positive electrode input end of the operational amplifier is grounded after passing through the third resistor, the negative electrode input end of the operational amplifier is grounded after passing through the fourth resistor, and the negative electrode input end of the operational amplifier is connected to the output end of the operational amplifier after passing through the fifth resistor;

the resistance of the first resistor, the resistance of the second resistor, the resistance of the third resistor and the resistance of the fourth resistor are equal.

4. A display panel, comprising:

the display device comprises a display area and a non-display area surrounding the display area, wherein the display area is provided with a plurality of data lines which are arranged at intervals;

a wire break repair circuit as claimed in any one of claims 1 to 3, wherein a positive input terminal of the operational amplifier in the wire break repair circuit is used for connecting a first end of the data wire which is broken; the output end of the operational amplifier is used for being connected with the second end of the broken data line so as to repair the broken data line.

5. The display panel according to claim 4, wherein the non-display region is provided with a first repair line connected to a first end of the data line of the broken line and a second repair line connected to a second end of the data line of the broken line;

the positive electrode input end of the operational amplifier is connected with the first end of the broken data line through the first repair line;

and the output end of the operational amplifier is connected with the second end of the broken data line through the second repair line.

6. A wire breakage repair method performed with the wire breakage repair circuit of any one of claims 1-3, the method comprising:

determining a compensation voltage waveform, wherein the period of the compensation voltage waveform is the same as the period of the gray scale voltage waveform;

and controlling the square wave generating circuit to generate the compensation voltage waveform, so that the operational amplifier adds up the compensation voltage waveform and the gray scale voltage waveform and then transmits the accumulated compensation voltage waveform and the gray scale voltage waveform to the broken data line so as to repair the broken data line.

7. The method of claim 6, wherein the determining a compensation voltage waveform comprises:

under the condition that the output end of the operational amplifier outputs gray-scale voltage waveforms, simulating first voltage waveforms output to the broken data lines according to a resistance-capacitance load on a connection line between the output end of the operational amplifier and the second end of the broken data lines;

adjusting the peak value of the first voltage waveform to obtain a second voltage waveform, wherein the peak value of the second voltage waveform is equal to the peak value of the gray scale voltage waveform;

according to the second voltage waveform and the resistance-capacitance load, reversely pushing to obtain a target voltage waveform to be output by the output end of the operational amplifier;

and subtracting the gray-scale voltage waveform from the target voltage waveform to obtain a compensation voltage waveform.

8. The method of claim 7, wherein after controlling the square wave generation circuit to generate the compensation voltage waveform, the method comprises:

detecting whether the display state of the display panel meets the preset requirement;

and if the display state of the display panel does not meet the preset requirement, controlling the square wave generating circuit to adjust the peak value of the compensation voltage waveform until the display state of the display panel meets the preset requirement.

9. The method of claim 6, wherein determining the compensation voltage waveform comprises:

controlling the square wave generating circuit to generate a preset voltage waveform, and detecting whether the display state of the display panel meets the preset requirement, wherein the period of the preset voltage waveform is the same as the period of the gray scale voltage waveform;

when the display state of the display panel meets the preset requirement, taking the preset voltage waveform as a compensation voltage waveform;

and when the display state of the display panel does not meet the preset requirement, controlling the square wave generating circuit to adjust the peak value of the preset voltage waveform until the display state of the display panel meets the preset requirement.

10. The method of claim 6, wherein prior to acquiring the compensation voltage waveform, the method further comprises:

when the broken data line in the display panel is detected, the first end of the broken data line is connected with the positive electrode input end of the operational amplifier through a first repair line, and the output end of the operational amplifier is connected with the second end of the broken data line through a second repair line.