CN105448265B - One kind repairs unit and its restorative procedure, gate driving circuit, display device - Google Patents

Abstract

Embodiments of the present invention provide a repair unit and its repair method, a gate drive circuit, and a display device, which relate to the field of display technology and can ensure that the signal output from a damaged shift register unit to a gate line is normal. The repair unit includes a comparison module, a control module and an output module. Wherein, the comparison module is used to compare the signal collected by the second signal terminal with the signal of the reference voltage terminal, and output the comparison result to the control module; the control module is used to control the opening and closing of the output module according to the signal output by the comparison module ; The output module is used to output the signal of the first signal terminal to the second signal terminal in the on state. Used to repair the signal.

Description

A repair unit and its repair method, gate drive circuit, and display device

technical field

The invention relates to the field of display technology, in particular to a repair unit and its repair method, a gate drive circuit, and a display device.

Background technique

Thin Film Transistor-Liquid Crystal Display (TFT-LCD) is composed of a pixel matrix defined by the intersection of gate lines and data lines in both horizontal and vertical directions. The gate driver on the upper gate sequentially inputs a square wave of a certain width to each pixel row from top to bottom to strobe, and then outputs the signal required by each row of pixels from top to bottom through the source driver on the data line, so that Realize screen display.

The above-mentioned gate driver can be fabricated in the non-display area on one side of the TFT-LCD through a bonding process. In addition, as the display resolution continues to increase, the output terminals of the gate driver need to be continuously increased, and the length of the gate driver will also increase. This is not conducive to the design requirements of symmetry on both sides of the frame and narrow frame. In order to solve the above problems, GOA (Gate Driver on Array, array substrate row drive) circuit design is adopted in the prior art, and the gate drive circuit composed of TFT is integrated on both sides of the array substrate of the display panel, and the gate drive on one side is The circuit scans the odd-numbered gate lines of the display panel, and the gate drive circuit on the other side scans the even-numbered gate lines of the display panel.

However, the above-mentioned gate drive circuit includes multi-stage cascaded shift register units. When a shift register unit is damaged, it will affect the output results of the upper and lower level shift register units, so that the display panel displays abnormal.

Contents of the invention

Embodiments of the present invention provide a repairing unit and its repairing method, a gate drive circuit, and a display device, which can ensure that the signal output to the gate line by a damaged one-stage shift register unit is normal.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

An aspect of the embodiments of the present invention provides a repair unit, including a comparison module, a control module, and an output module; the comparison module is connected to a second signal terminal, a reference voltage terminal, and the The signal collected by the signal terminal is compared with the signal at the reference voltage terminal, and the comparison result is output to the control module; the control module is also connected to the output module, and is used to control the signal according to the signal output by the comparison module. Turning on and off of the output module; the output module is connected to the first signal terminal and the second signal terminal, and is used to output the signal of the first signal terminal to the second signal terminal in the on state.

Preferably, it also includes a shift processing module, the first signal terminal is connected to the output module through the shift processing module, and is used to shift the output signal of the first signal terminal for a preset time, When the output module is turned on, it is output to the second signal terminal through the output module.

Preferably, the comparison module includes a comparator, the first input terminal of the comparator is connected to the second signal terminal, the second input terminal is connected to the reference voltage terminal, and the output terminal is connected to the control module.

Preferably, the control module includes a D flip-flop, the first input end of the D flip-flop is connected to the comparison module, the second input end is connected to a clock signal, and the output end is connected to the output module.

Preferably, the output module includes a switch transistor, the gate of the switch transistor is connected to the control module, the first pole is connected to the first signal terminal, and the second pole is connected to the second signal terminal.

Preferably, the shift processing module includes a digital-to-analog conversion sub-module, a shift sub-module, and an analog-to-digital conversion sub-module; the input terminal of the digital-to-analog conversion sub-module is connected to the first signal terminal and the third signal terminal, The output end is connected to the input end of the shift sub-module; the output end of the shift sub-module is connected to the input end of the analog-to-digital conversion sub-module; the output end of the analog-to-digital conversion sub-module is connected to the output module.

Still another aspect of the embodiments of the present invention provides a gate drive circuit, including multi-stage cascaded shift register units, and two adjacent shift register units are respectively connected to adjacent first gate lines and second gate lines. The line also includes any one of the above-mentioned repairing units; wherein, the first gate line is connected to the first signal terminal of the repairing unit; the second gate line is connected to the second signal terminal of the repairing unit end connected.

Preferably, when the input end of the first-stage shift register unit is connected to the first start signal end, the first start signal end is connected to the first signal end, and the output of the first-stage shift register unit terminal is connected to the second signal terminal.

Preferably, when the input end of the last-stage shift register unit is connected to the second start signal end, the second start signal end is connected to the first signal end, and the last-stage shift register unit The output end is connected to the second signal end; wherein, the first start signal end is used to output the start signal in the first image frame, and the second start signal end is used to output the start signal in the second image frame A start signal, the first image frame and the second image frame are two adjacent image frames.

Still another aspect of the embodiments of the present invention provides a display device, which is characterized by comprising any one of the above-mentioned gate driving circuits.

Another aspect of the embodiments of the present invention provides a method for signal repair using any of the repair units as described above, including: the comparison module compares the signal collected by the second signal terminal with the reference voltage terminal, and Output the comparison result to the control module; the control module controls the opening and closing of the output module according to the signal output by the comparison module; the output module outputs the signal of the first signal terminal to the second signal terminal.

Preferably, when the repairing unit further includes a shift processing module, the output module outputs the signal of the first signal end to the second signal end before the output module is turned on, and the method further includes shifting The processing module shifts the output signal of the first signal terminal line by a preset time.

Embodiments of the present invention provide a repair unit and a repair method thereof, a gate drive circuit, and a display device. The repair unit includes a comparison module, a control module and an output module. Wherein, the comparison module is connected to the second signal terminal, the reference voltage terminal and the control module, and is used to compare the signal collected by the second signal terminal with the signal of the reference voltage terminal, and output the comparison result to the control module. The control module is also connected to the output module, and is used to control the opening and closing of the output module according to the signal output by the comparison module. The output module is connected to the first signal terminal and the second signal terminal, and is used to output the signal of the first signal terminal to the second signal terminal in an on state.

In this way, by comparing the signal collected at the second signal terminal with the signal at the reference voltage terminal by the comparison module, it can be determined whether the signal at the second signal terminal meets the preset condition. If the preset conditions are not met. The above-mentioned control module can turn on the output module after receiving the output signal of the comparison module, so as to output the signal of the first signal terminal to the second signal terminal through the output module, thereby repairing the signal of the second signal terminal, avoiding the signal caused by the second signal terminal The signal does not meet the preset condition, which causes the component receiving the output signal of the second signal terminal to fail to work normally. In the case where the first signal terminal and the second signal terminal of the repair unit are respectively connected to the output terminals of any adjacent two-stage shift register unit in the gate drive circuit, when the shift register unit is connected to the second signal terminal When the signal output by the output end of the first signal end does not meet the preset conditions, the signal output by the shift register unit connected to the first signal end can be output by the repair unit to the output end of the shift register unit connected to the second signal end signal to be repaired. Therefore, it is possible to avoid the problem that a shift register unit of a certain stage fails to output a normal signal, and the other shift register units connected to the shift register unit fail to output a normal signal.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of a repair unit provided by an embodiment of the present invention;

FIG. 2 is a schematic structural view of a display device provided with the repair unit shown in FIG. 1;

FIG. 3 is a schematic structural view of another display device provided with the repair unit shown in FIG. 1;

Fig. 4 is a schematic structural diagram of another repair unit provided by an embodiment of the present invention;

Fig. 5 is the oscillogram of the output signal after repairing through the repairing unit described in Fig. 4;

Fig. 6 is a specific structural schematic diagram of the repair unit shown in Fig. 1;

Fig. 7 is a specific structural schematic diagram of the repair unit shown in Fig. 4;

FIG. 8 is a timing diagram of various signals used to control the gate drive circuit in the display device shown in FIG. 3;

FIG. 9 is a schematic structural view of the display device shown in FIG. 3 provided with preset grid lines;

FIG. 10 is a schematic structural diagram of the first-stage and last-stage shift register units connected to the initial signal terminals in the gate drive circuit of the display device shown in FIG. 2;

Fig. 11 is a flowchart of a repairing method for a repairing unit provided by an embodiment of the present invention.

Reference signs:

01-repair unit; 10-comparison module; 20-control module; 30-output module; 40-shift processing module; 100-display panel.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a repair unit 01 , as shown in FIG. 1 , including a comparison module 10 , a control module 20 and an output module 30 .

Wherein, the comparison module 10 is connected to the second signal terminal S1, the reference voltage terminal Vref and the control module 20, and is used to compare the signal collected by the second signal terminal S2 with the signal of the reference voltage terminal Vref, and output the comparison result to the control Module 20.

The control module 20 is also connected to the output module 30 , and is used for controlling the opening and closing of the output module 30 according to the signal output by the comparison module 10 .

The output module 30 is connected to the first signal terminal S1 and the second signal terminal S2, and is used to output the signal of the first signal terminal S1 to the second signal terminal S2 in the turned-on state, so as to perform the signal output from the second signal terminal S2 repair.

It should be noted that the first and first signal terminals S1 and the second signal terminal S2 are two different signal terminals.

Second, the voltage of the reference voltage terminal Vref is related to judging whether the voltage signal collected by the second signal terminal S2 satisfies a preset condition. Since TFT is a commonly used component in circuit structure. Therefore, the above preset conditions may be related to the on or off of the TFT. For example, when the preset condition is that the signal collected by the second signal terminal S2 needs to be able to turn on the N-type TFT in the circuit, since the turn-on voltage of the N-type transistor is about 5V-12V, the voltage of the above-mentioned reference voltage terminal Vref Can be 2V ~ 4V. In this case, when the voltage collected by the second signal terminal S2 is lower than the voltage of the reference voltage terminal Vref, the above-mentioned N-type TFT cannot be turned on. Therefore, the signal of the first signal terminal S1 needs to be repaired by the repair unit 01 to the signal of the second signal terminal S2.

Or, when the preset condition is that the signal collected by the second signal terminal S2 needs to be able to turn on the P-type TFT in the circuit, since the turn-on voltage of the N-type transistor is about -4V～-10V, the above-mentioned reference voltage terminal The voltage of Vref can be -2V～-3V. In this case, when the voltage collected by the second signal terminal S2 is greater than the voltage of the reference voltage terminal Vref, the P-type TFT cannot be turned on. Therefore, the signal of the first signal terminal S1 needs to be repaired by the repair unit 01 to the signal of the second signal terminal S2.

Third, the signal of the first signal terminal S1 to repair the signal of the second signal terminal S2 means that when the signal output by the second signal terminal S2 does not meet the preset conditions, the signal of the first signal terminal S1 can be replaced The signal of the second signal terminal S2 is output, so that the signal output by the second signal terminal S2 satisfies a preset condition.

For example, when the above-mentioned repair unit 01 is applied to a gate driving circuit, and the above-mentioned preset condition is for turning on an N-type TFT. If the shift register unit of a certain stage in the gate drive circuit is damaged, so that the signal output by the gate line connected to the shift register unit cannot conduct the above-mentioned TFT, the repair unit 01 can be used to repair the damaged The output signal of the adjacent shift register unit of the shift register unit is input to the repair unit 01 through the first signal terminal S1, and then the above normal signal is output to the output of the damaged shift register unit through the second signal terminal S2 terminal, so as to ensure that the damaged shift register unit can output a normal signal satisfying the preset condition.

The present invention does not limit the way of setting the above preset conditions. However, the following embodiments are all described by taking the preset condition that the N-type TFT in the circuit structure needs to be turned on as an example.

An embodiment of the present invention provides a repair unit, including a comparison module, a control module and an output module. Wherein, the comparison module is connected to the second signal terminal, the reference voltage terminal and the control module, and is used to compare the signal collected by the second signal terminal with the signal of the reference voltage terminal, and output the comparison result to the control module. The control module is also connected to the output module, and is used to control the opening and closing of the output module according to the signal output by the comparison module. The output module is connected to the first signal terminal and the second signal terminal, and is used to output the signal of the first signal terminal to the second signal terminal in an on state.

In this way, by comparing the signal collected at the second signal terminal with the signal at the reference voltage terminal by the comparison module, it can be determined whether the signal at the second signal terminal meets the preset condition. If the preset conditions are not met. The above-mentioned control module can turn on the output module after receiving the output signal of the comparison module, so as to output the signal of the first signal terminal to the second signal terminal through the output module, thereby repairing the signal of the second signal terminal, avoiding the signal caused by the second signal terminal The signal does not meet the preset condition, which causes the component receiving the output signal of the second signal terminal to fail to work normally. In the case where the first signal terminal and the second signal terminal of the repair unit are respectively connected to the output terminals of any adjacent two-stage shift register unit in the gate drive circuit, when the shift register unit is connected to the second signal terminal When the signal output by the output end of the first signal end does not meet the preset conditions, the signal output by the shift register unit connected to the first signal end can be output by the repair unit to the output end of the shift register unit connected to the second signal end signal to be repaired. Therefore, it is possible to avoid the problem that a shift register unit of a certain stage fails to output a normal signal, and the other shift register units connected to the shift register unit fail to output a normal signal.

When the repair unit 01 is applied to the gate drive circuit, it can output a normal signal to the output terminal of the damaged shift register unit RS.

Specifically, as shown in FIG. 2 , the gate driving circuit includes multi-stage cascaded shift register units (RS1, RS2, RS3...RSn). Each row of gate lines ( G1 , G2 , G3 . . . Gn) in the display panel 100 is respectively connected. Where n is a positive integer ≥ 2.

Wherein, the above-mentioned repairing unit 01 may be arranged between two adjacent rows of gate lines. Among the two adjacent rows of gate lines, the upper row of gate lines may be connected to the first signal terminal S1 of the repairing unit 01 , and the lower row of gate lines may be connected to the second signal terminal S2 of the repairing unit 01 . For example, the gate line G1 connected to the first-stage shift register unit RS1 can be connected to the first signal terminal S1 of the repair unit 01, and the gate line G2 connected to the second-stage shift register unit RS2 can be connected to the repair unit The second signal terminal S2 of 01 is connected.

In this way, the comparison module 10 shown in FIG. 1 in the restoration unit 01 can collect the signal of the gate line G2 through the second signal terminal S2, and compare the collected signal with the signal of the reference voltage terminal Vref. In order to turn on the N-type TFT, the voltage signal on the gate line G2 needs to be greater than the voltage of the reference voltage terminal Vref. If the voltage signal on the gate line G2, that is, the signal collected by the second signal terminal S2 is lower than the voltage of the reference voltage terminal Vref, it means that the second-stage shift register unit RS2 connected to the gate line G2 fails, causing the gate The signal output by the line G2 cannot satisfy the preset condition. At this time, the control module 20 controls the output module 30 to turn on, and outputs the signal of the first gate line G1 to the second signal terminal S2 through the first signal terminal S1, and then outputs the second signal terminal S2 to the gate line G2, thereby realizing Repair the output signal of the gate line G2.

To sum up, in the gate drive circuit shown in FIG. 2 , when the above-mentioned repair unit 01 is arranged between any two adjacent rows of gate lines, along the arrow direction of the solid line in FIG. 2 , the upper row The signals output by the gate lines can be repaired by the repair unit to the signals output by the next row of gate lines.

Of course, the above description is that the upper row of gate lines in any two adjacent rows of gate lines can be connected to the first signal terminal S1 of the repair unit 01, and the next row of gate lines can be connected to the second signal terminal S2 of the repair unit 01 , so as to realize that the signal output by the gate line of the previous row is repaired by the repair unit for the signal output by the gate line of the next row as an example. In addition, the next row of gate lines in any two adjacent rows can be connected to the first signal terminal S1 of the repair unit 01 , and the upper row of gate lines can be connected to the second signal terminal S2 of the repair unit 01 . For example, the gate line G1 connected to the first-stage shift register unit RS1 can be connected to the second signal terminal S2 of the repair unit 01, and the gate line G2 connected to the second-stage shift register unit RS2 can be connected to the repair unit The first signal terminal S1 of 01 is connected. In this case, when the first-stage shift register unit RS1 fails, the output signal of the gate line G2 connected to the second-stage shift register unit RS2 can be sent to the gate line through the repair unit 01 through the repair unit 01. The signal of G1 is repaired, so that the gate line G1 and the gate line G2 output the same signal. By analogy, as shown in the direction of the dotted arrow in FIG. 2 , the signals output by the gate lines of the next row can be repaired by the repair unit to the signals output by the gate lines of the previous row.

It should be noted that the present invention does not limit the physical location of the shift register units RS in the gate driving circuit, as shown in FIG. 2 , all the shift register units RS may be located on one side of the display panel 100 . Alternatively, as shown in FIG. 3 , shift register units RS may be provided on both sides of the display panel 100, wherein the shift register unit RS on one side is used to provide grid lines (G1, G1, G3, G5...G(2n+1)) output scanning signals. The shift register unit RS on the other side is used for outputting scan signals to the even-numbered gate lines ( G2 , G4 , G6 . . . G(2n)) in the display panel 100 .

In this case, in the structure shown in FIG. 3, the above-mentioned repair unit 01 can also be set between two adjacent rows of gate lines, so as to realize the signal output by the previous row of gate lines through the repair unit along the direction of the arrow in FIG. 3 The signal output by the next row of gate lines is repaired, or, along the direction of the dotted arrow in FIG. 3 , the signal output by the next row of gate lines is repaired by the repair unit to the signal output by the previous row of gate lines. The specific restoration process is the same as that described above, and will not be repeated here.

It can be seen from the above description that when the signal of the first signal terminal S1 of the restoration unit 01 is restored to the signal of the second signal terminal S2, the signal of the first signal terminal S1 is directly used as the output signal of the second signal terminal S2. For example, when the gate line G1 is connected to the first signal terminal S1, and the gate line G2 is connected to the second signal terminal S2, if the output signal of the gate line G2 cannot meet the preset condition, then the first signal terminal S2 will connect the gate line The signal of G1 is output to the gate line G2 through the output module 30 of the repairing unit 01 . At this time, the signals output by the gate line G2 and the gate line G1 are the same. In this case, for a high-resolution display device, since the pixel units on the display panel 100 are densely arranged, the number is large, and the response is fast. Therefore, it has less influence on the display effect. However, for a low-resolution display device with a small number of pixels and a relatively slow corresponding speed, it is easy for human eyes to detect display abnormalities, which will greatly affect the display effect.

In order to solve the above problem, when the restoration unit 01 restores the signal of the first signal terminal S1 to the signal of the second signal terminal S2, it also needs to shift the signal of the first signal terminal S1. Specifically, as shown in FIG. 4 , the repair unit 01 may further include a displacement processing module 40 . Wherein, the above-mentioned first signal terminal S1 is connected to the output module 30 through the shift processing module 40, and is used to shift the output signal of the first signal terminal S1 for a preset time, and then when the output module 30 is turned on, through The output module 30 outputs to the second signal terminal S2.

In any two adjacent rows of gate lines in Figure 2, the upper row of gate lines G(n-1) can be connected to the first signal terminal S1 of the repair unit 01, and the next row of gate lines Gn is connected to the second signal terminal of the repair unit 01. The connection of the signal terminal S2 is taken as an example, and the repairing process of the above-mentioned repairing unit 01 having the shift processing module 40 will be described.

Specifically, firstly, the comparison module 10 in the repairing unit 01 can collect the signal of the gate line Gn through the second signal terminal S2, and compare the collected signal with the signal of the reference voltage terminal Vref. When the signal output by the gate line Gn fails to meet the preset condition, that is, the voltage of the reference voltage terminal Vref is lower than that of the reference voltage terminal Vref, so that the N-type TFT cannot be turned on, the control module 20 controls the output module 30 to turn on. In this case, the shift processing module 40 shifts the signal of the gate line G(n-1) for a preset time t and then outputs it to the second signal terminal S2 through the output module 30 as shown in FIG. The final output signal of the gate line Gn connected to the second signal terminal S2 is shown in FIG. 5 , which may differ from the signal of the gate line G(n−1) by a preset time t. In this way, when the signal of the previous row of gate lines is used to repair the signal of the next row of gate lines through the repairing unit 01 , the display effect will be greatly affected due to the output of the same signal from two adjacent rows of gate lines.

It should be noted that the preset time t mentioned above can be set according to the scanning signal output by the gate lines when the display panel 100 is displaying. As shown in FIG. 5 , for an 8Phase (phase) raster line signal, it can be collected 8 times within a time P, so that the time P includes 8 preset times t. In this case, the shift processing module 40 can shift the gate line G(n-1), so that the output signal of the gate line G(n-1) and the signal output by the gate line Gn have a phase difference of 1/4 . Of course, for the 16Phase (phase) raster line signal, it can be collected 16 times within a time P so that the time P includes 16 preset times t. Similarly, finally, the shift processing module 40 makes the output signal of the gate line G(n−1) and the signal output by the gate line Gn have a phase difference of 1/8. The foregoing is only an example of how to set the preset time t. Other setting methods are the same as above, and will not be repeated here.

The above is only an example of applying the repairing unit 01 to the gate drive circuit, and describes the structure and repairing process of the repairing unit 01 . The case where the repair unit 01 is applied to other circuit structures will not be repeated here, as long as one of the signal lines or signal terminals in the circuit can be connected to the first signal terminal S1 of the repair unit 01, the other signal terminal or The signal line is connected to the second signal terminal S2 of the repairing unit 02. When the output signal of the signal terminal or the signal line connected to the second signal terminal S2 is wrong, the repairing unit 01 can be used to connect the circuit with the first The signals of the signal terminals or signal lines connected to the signal terminal S1 are used to repair the above-mentioned erroneous signals.

The specific structure of each module in the above repair unit 01 will be described in detail with examples below.

Specifically, as shown in FIG. 6, the comparison module 10 includes a comparator, the first input terminal (+) of the comparator is connected to the second signal terminal S2, the second input terminal (-) is connected to the reference voltage terminal Vref, and the output terminal is connected to the reference voltage terminal Vref. The control module 20 is connected. The voltage signal collected by the second signal terminal S2 can be compared with the voltage of the reference voltage terminal Vref through the comparator.

The control module 20 may include a D flip-flop, the first input terminal D of the D flip-flop is connected to the comparison module 10, the second input terminal C is connected to the clock signal CP, and the output terminal Connect the output module 30. When the structure of the comparison module 10 is as above, the first input terminal D of the D flip-flop is connected to the output terminal of the comparator.

It should be noted that, firstly, the D flip-flop also has an output terminal Q, which can be treated as vacant. Among them, the output It is opposite to the signal output by the output terminal Q. For example, the output Output 1, then the output terminal Q outputs 0, and vice versa. In addition, the output terminal Q can also be connected with the output module 30, and the output terminal Make it vacant. The present invention is not limited thereto.

Second, the second input terminal C of the above-mentioned D flip-flop needs to be connected to the clock signal CP. As long as the clock signal satisfies the above-mentioned first signal terminal S1 outputting a high-level device, the potential jump of the clock signal signal CP is sufficient.

For example, when the repair unit 01 is applied to the gate drive circuit shown in FIG. 3 , the shift register unit on the left side of the display panel 100 in the gate drive circuit needs to be connected to the signal STV_L_1 as shown in FIG. 8 , STV_L_2, CLK_L_1, CLK_L_2, CKB_L_1, CKB_L_2, the shift register unit located on the right side of the display panel 100 in the gate drive circuit needs to connect the signals STV_R_1, STV_R_2, CLK_R_1, CLK_R_2, CKB_R_1, CKB_R_2, so that the control of the above signal lines Each gate line ( G1 , G2 , G3 . . . ) outputs a scan signal to each row of pixel units in the display panel 100 . It should be noted that, in order to make the drawing concise, the above-mentioned signals in FIG. 8 are not drawn in FIG. 3 .

Based on this, if the above-mentioned repair unit 01 is set between the gate line G1 and the gate line G2, and the gate line G1 is connected to the first signal terminal S1, and the gate line G2 is connected to the second signal terminal S2, that is, the repair unit 01 uses the gate line G1 The signal of the grid line G2 is restored. At this time, as shown in Figure 8, when the gate line G1 is at a high level, the signal level of the gate line G2 jumps, and the output signal of the gate line G1 is obtained from the signal CKB_L_1, and the output signal of the gate line G1 The signal is the signal CKB_L_2, so the signal CKB_L_2 can be used as the clock signal connected to the second input terminal of the above-mentioned D flip-flop. Of course, when the gate line G1 is at a high level, in addition to the level transition of the signal of the gate line G2, there are other signals, such as the level transition of the signals of the gate line G3 and the gate line G4. Therefore, the clock signal used to generate the above-mentioned gate line signal can be used as the clock signal of the second input terminal of the D flip-flop, which will not be repeated here.

In addition, the output module 30 may include a switch transistor T, wherein the gate of the switch transistor T is connected to the control module 20 , the first pole is connected to the first signal terminal S1 , and the second pole is connected to the second signal terminal S2 . When the structure of the control module 20 is as described above, the gate of the switching transistor T is connected to the output terminal of the control module 20

It should be noted that the output module 30 may also include a plurality of TFTs connected in parallel with the switching transistors T. As shown in FIG. In addition, the present invention does not limit the type of the switching transistor T, which may be N-type or P-type. The following embodiments are all described by taking the switch transistor T as an N-type transistor as an example.

Next, the working process of the repair unit 01 shown in FIG. 6 will be described.

First, the above repair unit 01 is applied to a gate drive circuit, and the TFTs connected to the gate lines in the display panel 100 connected to the gate drive circuit are all N-type TFTs. In this case, the voltage of the reference voltage terminal Vref may be 2V˜4V. In addition, in FIG. 2 or FIG. 3 , the gate line G(n−1) is connected to the first signal terminal S1 , and the gate line Gn is connected to the second signal terminal S2 .

Next, the comparator will compare the voltage signal on the gate line Gn collected by the second signal terminal S2 with the voltage at the reference voltage terminal Vref. When Gn<Vref, it means that the signal output by the gate line Gn cannot control the display panel. The TFT connected to the gate line on 100 is turned on. At this time, the output terminal of the comparator inputs a low level to the first input terminal of the D flip-flop, that is, C1=0.

In this case, the gate line Gn can be used to output a signal with a high level transition and a level transition, for example, the signal of the gate line G(n-2) as a clock connected to the second input terminal C of the D flip-flop Signal. When the level of the output signal of the gate line G(n-2) jumps, the output terminal Q outputs a signal, Q=C1=0, at this time the output terminal is high level. In this case, the switch transistor T1 is turned on, so that the signal output from the gate line G(n-1) connected to the first signal terminal S1 is output to the second signal terminal S2 through the switch transistor T1, and passed through the second signal terminal S2. The terminal S2 restores the signal of the gate line Gn.

Further, as shown in FIG. 7 , the shift processing module 40 may include a digital-to-analog (A/D) conversion sub-module 401 , a shift sub-module 402 and an analog-to-digital (D/A) conversion sub-module 40 .

Specifically, the input end of the digital-to-analog (A/D) conversion sub-module 401 is connected to the first signal end S1 and the third signal end S3 , and the output end is connected to the input end of the shift sub-module 402 . Wherein, the third signal terminal is used to output a start pulse to drive the digital-to-analog (A/D) conversion sub-module 401 to work, so as to convert the digital signal output by the first signal terminal S1 into an analog signal.

The output end of the shift sub-module 402 is connected to the input end of the analog-to-digital (D/A) conversion sub-module 403 . Specifically, as shown in FIG. 5 , the signal of the gate line G(n−1) connected to the first signal terminal S1 can be shifted by 1/4 phase.

The output terminal of the analog-to-digital (D/A) conversion sub-module 403 is connected to the output module 30 . Wherein, when the structure of the output module 30 is as above, the output terminal of the analog-to-digital (D/A) conversion sub-module 403 is connected to the first pole of the switching transistor T. The analog-to-digital (D/A) conversion sub-module 403 can output the shifted signal to the gate line Gn through the second signal terminal S2, and the waveform of the output signal of the gate line Gn is shown in FIG. 5 .

It should be noted that, first, the above description of the working process of the repair unit 01 shown in Figure 6 or Figure 7 is to apply the repair unit 01 to the gate drive circuit, and the upper row of gate lines G(n- The signal of 1) is described as an example where the repairing unit 01 repairs the signal of the gate line Gn in the next row. In addition, the signal of the gate line Gn in the next row can also be used, and the signal of the gate line G(n−1) in the previous row can be repaired by the repair unit 01 . The restoration process is the same as that described above, and will not be repeated here.

Second, in the embodiment of the present invention, the comparison module 10 is not limited to a comparator, as long as it can realize the same function as the comparator. Similarly, the control module 20 is not limited to the D flip-flop, as long as it can realize the same function as the D flip-flop.

An embodiment of the present invention provides a gate driving circuit, as shown in FIG. 2 or FIG. 3 , including multi-stage cascaded shift register units RS. Among them, the present invention does not limit the cascading mode between the shift register units RS, as shown in Figure 2 or Figure 3, the output signal of the upper-level shift register unit among the adjacent two-level shift register units can be The input signal of the shift register unit of the next stage. Alternatively, the output signal of the shift register unit Gn may also be used as the input signal of the shift register unit G(n+3). Other cascading modes will not be described here one by one.

In addition, two adjacent shift register units are respectively connected to adjacent first gate lines and second gate lines. For example, adjacent first-stage shift register units RS1 and second-stage shift register units RS2 are respectively connected to adjacent gate lines G1 and G2. Therefore, the first gate line is the gate line G1 and the second gate line is the gate line G2 , or the first gate line is the gate line G2 and the second gate line is the gate line G1 . Therefore, the above-mentioned first grid line and second grid line refer to any two adjacent grid lines, but the upper and lower arrangement positions of the above-mentioned two grid lines are not limited.

In addition, the gate drive circuit further includes any repair unit 01 as described above. Wherein, the first gate line is connected to the first signal terminal S1 of the repairing unit 01 . The second gate line is connected to the second signal terminal S2 of the repair unit 02 . Since the repairing unit 01 restores the signal of the first signal terminal S1 to the signal of the second signal terminal S2, the upper and lower arrangement positions of the first gate line and the second gate line are not limited. Therefore, when the first grid line is located above the second grid line, that is, when the first grid line is the upper row of grid lines and the second grid line is the next row of grid lines, the repair unit 01 can be used to realize the pair of the upper row of grid lines. Repair of the output signal of a row of raster lines. In addition, when the first grid line is located below the second grid line, that is, the first grid line is the next row of grid lines, and the second grid line is the previous row of grid lines, the repair unit 01 can realize the next row of grid lines. Repair of the output signal of a row of raster lines.

In this way, it is possible to avoid the failure of a shift register unit of a certain stage to output normal scanning signals to the gate lines, resulting in the failure of other shift register units connected to the shift register unit to output normally.

It should be noted that, in order to stabilize the scanning signal output by the gate lines on the display panel 100 , preset gate lines may be set in non-display areas other than the display panel 100 . Specifically, on the basis of the display device shown in FIG. 3 , as shown in FIG. 9 , a first preset gate line Dummy_L1 and a second preset gate line Dummy_R1 may be provided in the non-display area above the display panel 10 . In addition, the third preset gate line Dummy_L2 and the fourth preset gate line Dummy_R2 may also be disposed in the non-display area below the display panel 10 . The input ends of the preset gate lines are all connected with shift register units. In this case, the above-mentioned first grid line and second grid line can also be any two adjacent preset grid lines, such as the first preset grid line Dummy_L1 and the second preset grid line Dummy_R1, or the third preset grid line The preset gate line Dummy_L2 and the fourth preset gate line Dummy_R2.

In addition, the first gate line and the second gate line may also be the second preset gate line Dummy_R1 and the gate line G1 , or the gate line Gn and the third preset gate line Dummy_L2 .

In this case, between two adjacent predetermined gate lines, between the second predetermined gate line Dummy_R1 and the gate line G1, or between the gate line Gn and the third predetermined gate line Dummy_L2 can be as shown in FIG. 9 Shows setting repair unit 01.

In addition, the repairing process of the output signal of the shift register unit by the repairing unit 01 is as described above, and will not be repeated here. The following will repair the output signals of the first-stage shift register and the last-stage shift register when the output failure of the first-stage shift register and the last-stage shift register in the gate drive circuit causes the output to fail normally. Be explained.

Wherein, as shown in FIG. 9, when a preset gate line (Dummy_L1, Dummy_R1, Dummy_L2 or Dummy_R2) is set in the display device, the shift register unit of the first stage may be a shift register unit connected to the first preset gate line Dummy_L1. The bit register unit RS_01 and the shift register unit of the last stage may be the shift register unit RS_04 connected to the fourth preset gate line Dummy_R2.

Or, as shown in FIG. 2 or FIG. 10, when the preset gate line (Dummy_L1, Dummy_R1, Dummy_L2 or Dummy_R2) is not set in the display device, the first-stage shift register unit can be connected to the gate line G1 on the display panel 100 The connected shift register unit RS1 and the last stage of the shift register unit may be the shift register unit RSn connected to the gate line Gn on the display panel 100 .

Hereinafter, taking FIG. 10 as an example, when the first-stage shift register and the last-stage shift register are damaged, the restoration process of outputting a normal signal through the above-mentioned restoration unit 01 will be described.

Wherein, when the input terminal of the first-stage shift register unit RS1 is connected to the first start signal terminal STV_1, when the first-stage shift register RS1 fails, causing the gate line G1 to fail to output normally, the first start signal terminal STV_1 can be The repair unit 01 is disposed between the signal terminal STV_1 and the gate line G1. Specifically, the first start signal terminal STV_1 is connected to the first signal terminal S1, and the output terminal of the shift register unit RS1 of the first stage is connected to the second signal terminal S2. Thus, the first signal terminal S1 outputs the signal of the first starting signal terminal STV_1 to the second signal terminal S2 through the repair unit 02, and through the second signal terminal S2 to the output terminal of the first-stage shift register unit RS1 (that is, the gate The signal of line G1) is repaired.

In addition, when the input terminal of the last-stage shift register unit RSn is connected to the second start signal terminal STV_2, when the last-stage shift register RSn fails and the gate line Gn cannot output normally, the second The start signal terminal STV_2 is connected to the first signal terminal S1, and the output terminal of the last stage shift register unit RSn is connected to the second signal terminal S2. Thus, the first signal terminal S1 outputs the signal of the second starting signal terminal STV_2 to the second signal terminal S2 through the repair unit 02, and through the second signal terminal S2 to the output terminal of the last stage shift register unit RSn (ie The signal of the gate line Gn) is repaired.

Among them, the above-mentioned first start signal terminal STV_1 is used to output the start signal in the first image frame, the second start signal terminal STV_2 is used to output the start signal in the second image frame, and the first frame image frame and the second frame The image frames are two adjacent image frames.

An embodiment of the present invention provides a display device, including any gate driving circuit as described above. It has the same structure and beneficial effects as the gate driving circuit provided by the foregoing embodiments, and since the foregoing embodiments have described the structure and beneficial effects of the gate driving circuit in detail, details are not repeated here.

It should be noted that, in the embodiment of the present invention, the display device may at least include a liquid crystal display device and an organic light-emitting diode display device. For example, the display device may be any device with A product or part showing a function.

An embodiment of the present invention provides a method for signal repair using any of the repair units 01 described above, as shown in FIG. 11 , the method includes:

S101 , the comparison module 10 compares the signal collected by the second signal terminal S2 with the reference voltage terminal Vref, and outputs the comparison result to the control module 20 .

S102 , the control module 20 controls the opening and closing of the output module 30 according to the signal output by the comparison module 10 .

S103 , the output module 30 outputs the signal of the first signal terminal S1 to the second signal terminal S2 when the output module 30 is turned on.

Specifically, when the comparison module 10 includes a comparator as shown in FIG. 6 , the control module 20 includes a D flip-flop, and the output module 30 includes a switching transistor T, when the above repair unit 01 is applied to the gate drive circuit, the The working process of repair unit 01 includes:

First, the TFTs connected to the gate lines in the display panel 100 connected to the gate driving circuit are all N-type TFTs. In this case, the voltage of the reference voltage terminal Vref may be 2V˜4V. In addition, in FIG. 2 or FIG. 3 , the gate line G(n−1) is connected to the first signal terminal S1 , and the gate line Gn is connected to the second signal terminal S2 .

Next, the comparator will compare the voltage signal on the gate line Gn collected by the second signal terminal S2 with the voltage at the reference voltage terminal Vref. When Gn<Vref, it means that the signal output by the gate line Gn cannot control the display panel. The TFT connected to the gate line on 100 is turned on. At this time, the output terminal of the comparator inputs a low level to the first input terminal of the D flip-flop, that is, C1=0.

In this case, the gate line Gn can be used to output a signal with a high level transition and a level transition, for example, the signal of the gate line G(n-2) as a clock connected to the second input terminal C of the D flip-flop Signal. When the level of the output signal of the gate line G(n-2) jumps, the output terminal Q outputs a signal, Q=C1=0, at this time the output terminal is high level. In this case, the switch transistor T1 is turned on, so that the signal output from the gate line G(n-1) connected to the first signal terminal S1 is output to the second signal terminal S2 through the switch transistor T1, and passed through the second signal terminal S2. The terminal S2 restores the signal of the gate line Gn.

In this way, by comparing the signal collected at the second signal terminal with the signal at the reference voltage terminal by the comparison module, it can be determined whether the signal at the second signal terminal meets the preset condition. If the preset conditions are not met. The above-mentioned control module can turn on the output module after receiving the output signal of the comparison module, so as to output the signal of the first signal terminal to the second signal terminal through the output module, thereby repairing the signal of the second signal terminal, avoiding the signal caused by the second signal terminal The signal does not meet the preset condition, which causes the component receiving the output signal of the second signal terminal to fail to work normally. In the case where the first signal terminal and the second signal terminal of the repair unit are respectively connected to the output terminals of any adjacent two-stage shift register unit in the gate drive circuit, when the shift register unit is connected to the second signal terminal When the signal output by the output end of the first signal end does not meet the preset conditions, the signal output by the shift register unit connected to the first signal end can be output by the repair unit to the output end of the shift register unit connected to the second signal end signal to be repaired. Therefore, it is possible to avoid the problem that a shift register unit of a certain stage fails to output a normal signal, and the other shift register units connected to the shift register unit fail to output a normal signal.

It can be seen from the above description that when the signal of the first signal terminal S1 of the restoration unit 01 is restored to the signal of the second signal terminal S2, the signal of the first signal terminal S1 is directly used as the output signal of the second signal terminal S2. For example, when the gate line G1 is connected to the first signal terminal S1, and the gate line G2 is connected to the second signal terminal S2, if the output signal of the gate line G2 cannot meet the preset condition, then the first signal terminal S2 will connect the gate line The signal of G1 is output to the gate line G2 through the output module 30 of the repairing unit 01 . At this time, the signals output by the gate line G2 and the gate line G1 are the same. In this case, for a high-resolution display device, since the pixel units on the display panel 100 are densely arranged, the number is large, and the response is fast. Therefore, it has less influence on the display effect. However, for a low-resolution display device with a small number of pixels and a relatively slow corresponding speed, it is easy for human eyes to detect display abnormalities, which will greatly affect the display effect.

In order to solve the above problems, when the restoration unit 01 as shown in FIG. 4 further includes a shift processing module 40, the output module 30 is in the open state, and outputs the signal of the first signal terminal S1 before the second signal terminal S2. The method further includes shifting the output signal of the first signal terminal line S1 by a preset time t by the shift processing module 40 . In this way, when the signal of the previous row of gate lines is used to repair the signal of the next row of gate lines through the repairing unit 01 , the display effect will be greatly affected due to the output of the same signal from two adjacent rows of gate lines.

Specifically, as shown in FIG. 7 , the shift processing module 40 may include a digital-to-analog (A/D) conversion sub-module 401 , a shift sub-module 402 and an analog-to-digital (D/A) conversion sub-module 40 .

The digital-to-analog (A/D) conversion sub-module 401 converts the digital signal output from the first signal terminal S1 into an analog signal. Next, the shift sub-module 402 shifts the signal of the gate line G(n−1) connected to the first signal terminal S1 for a preset time t, for example, 1/4 phase. Then, the analog-to-digital (D/A) conversion sub-module 403 outputs the shifted signal to the gate line Gn through the second signal terminal S2, and the waveform of the output signal of the gate line Gn is shown in FIG. 5 .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (11)

1. A gate drive circuit, comprising multi-stage cascaded shift register units, two adjacent shift register units are respectively connected to adjacent first gate lines and second gate lines, characterized in that the The gate drive circuit also includes a repair unit; The repair unit includes a comparison module, a control module and an output module; The comparison module is connected to the second signal terminal, the reference voltage terminal and the control module, and is used to compare the signal collected by the second signal terminal with the signal of the reference voltage terminal, and output the comparison result to the control module; The control module is also connected to the output module, and is used to control the opening and closing of the output module according to the signal output by the comparison module; The output module is connected to the first signal terminal and the second signal terminal, and is used to output the signal of the first signal terminal to the second signal terminal in an on state; Wherein, the first gate line is connected to the first signal end of the repair unit; The second gate line is connected to the second signal end of the repair unit. 2. The gate drive circuit according to claim 1, wherein the repair unit further comprises a shift processing module, the first signal terminal is connected to the output module through the shift processing module, After shifting the output signal of the first signal terminal for a preset time, the output signal is output to the second signal terminal through the output module when the output module is turned on. 3. The gate drive circuit according to claim 1, wherein the comparison module comprises a comparator, the first input terminal of the comparator is connected to the second signal terminal, and the second input terminal is connected to the The reference voltage terminal and the output terminal are connected with the control module. 4. The gate drive circuit according to claim 1, wherein the control module comprises a D flip-flop, the first input end of the D flip-flop is connected to the comparison module, and the second input end is connected to a clock signal , the output terminal is connected to the output module. 5. The gate drive circuit according to claim 1, wherein the output module includes a switch transistor, the gate of the switch transistor is connected to the control module, the first pole is connected to the first signal terminal, and the second pole is connected to the first signal terminal. The pole is connected to the second signal terminal. 6. The gate drive circuit according to claim 2, wherein the shift processing module comprises a digital-to-analog conversion sub-module, a shift sub-module, and an analog-to-digital conversion sub-module; The input end of the digital-to-analog conversion sub-module is connected to the first signal end and the third signal end, and the output end is connected to the input end of the shift sub-module; The output end of the shift sub-module is connected to the input end of the analog-to-digital conversion sub-module; The output end of the analog-to-digital conversion sub-module is connected to the output module. 7. The gate drive circuit according to claim 1, wherein when the input end of the shift register unit of the first stage is connected to the first start signal end, the first start signal end and the first signal end terminals, and the output terminal of the first-stage shift register unit is connected to the second signal terminal. 8. The gate drive circuit according to claim 7, wherein when the input end of the last stage shift register unit is connected to the second start signal end, the second start signal end is connected to the first start signal end A signal terminal is connected, and the output terminal of the last stage shift register unit is connected to the second signal terminal; Wherein, the first start signal terminal is used to output a start signal in the first image frame, the second start signal terminal is used to output a start signal in the second image frame, and the first image frame and the The second image frame is two adjacent image frames. 9. A display device, comprising the gate driving circuit according to any one of claims 1-8. 10. A method for signal restoration using the gate drive circuit according to any one of claims 1-8, characterized in that it comprises: The comparison module compares the signal collected by the second signal terminal with the reference voltage terminal, and outputs the comparison result to the control module; The control module controls the opening and closing of the output module according to the signal output by the comparison module; The output module outputs the signal of the first signal terminal to the second signal terminal when it is turned on. 11. The repair method according to claim 10, wherein when the repair unit further includes a shift processing module, the output module outputs the signal of the first signal terminal to the Before the second signal terminal, the method further includes a shift processing module shifting the output signal of the first signal terminal line for a preset time.