Pixel circuit, display substrate and display device

Abstract

The present invention discloses a pixel circuit, a display substrate and a display device, wherein the pixel circuit comprises a driving module, a detection module, a repair module, an original pixel light emitting diode and a spare pixel light emitting diode; the driving module is connected to the original pixel light emitting diode and the repair module; the original pixel light emitting diode is connected to the detection module and the repair module; the repair module is connected to the spare pixel light emitting diode and the detection module; the driving module is connected to a gate signal line and a data signal line; wherein the detection module is used to output a control signal to the repair module according to the output signal of the original pixel light emitting diode; the repair module supplies power to the spare pixel light emitting diode according to the control signal. The present invention automatically detects whether the original pixel light emitting diode is damaged through the detection module, and uses the spare pixel light emitting diode to replace the original pixel light emitting diode to achieve the purpose of repairing the pixel, thereby ensuring the display effect of the display device.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a pixel circuit, a display substrate and a display device. Background Art

[0002] Light Emitting Diode (LED) has high brightness and high reliability, so it will be widely used in the future display field, such as Micro Light Emitting Diode (Micro-LED) and Mini Light Emitting Diode (MiniLED). After MicroLED and MiniLED are made on the wafer, they are welded on the backplane by transfer. The backplane provides a current driving circuit, and the current flows through the MicroLED or MiniLED, making the MicroLED or MiniLED emit light to realize the display function.

[0003] In the related art, one sub-pixel corresponds to one LED chip. However, the problem with the related art is that due to the huge number of LED chips to be transferred, when the LED chip transfer fails or the LED chip is damaged, it will cause poor display dark spots, thereby affecting the display of MicroLED and MiniLED, and further resulting in poor display effect of the display device.

[0004] Therefore, the prior art still needs to be improved and developed. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a pixel circuit, a display substrate and a display device to solve the problem of poor display effect of the display device caused by poor display dark spots due to transfer failure of the LED chip or damage of the LED chip.

[0006] The technical solution of the present invention is as follows:

[0007] A pixel circuit, the pixel circuit comprising a driving module, a detection module, a repair module, an original pixel light emitting diode and a spare pixel light emitting diode; the driving module is connected to the original pixel light emitting diode and the repair module; the original pixel light emitting diode is connected to the detection module and the repair module; the repair module is connected to the spare pixel light emitting diode and the detection module; the driving module is connected to a gate signal line and a data signal line;

[0008] The detection module is used to output a control signal to the repair module according to the output signal of the original pixel light emitting diode; and the repair module supplies power to the spare pixel light emitting diode according to the control signal.

[0009] The present invention is further configured such that the driving module includes a first transistor, a second transistor and a capacitor; the first end of the first transistor is connected to the data signal line, the second end of the first transistor is connected to the gate end of the second transistor, the first end of the capacitor and the repair module, and the gate end of the first transistor is connected to the gate signal line; the first end of the second transistor is connected to the second end of the capacitor and the positive pole of the power supply, and the second end of the second transistor is connected to the anode of the original pixel light-emitting diode.

[0010] The present invention is further configured such that the detection module includes a first resistor, a first end of the first resistor is connected to the cathode of the original pixel light emitting diode and the repair module, and a second end of the first resistor is connected to the negative electrode of a power supply.

[0011] The present invention is further configured such that the repair module includes a third transistor and a fourth transistor; the first end of the third transistor is connected to the positive pole of the power supply, the second end of the third transistor is connected to the first end of the fourth transistor, and the gate end of the third transistor is connected to the first end of the capacitor; the second end of the fourth transistor is connected to the anode of the backup pixel light emitting diode, and the gate end of the fourth transistor is connected to the detection module.

[0012] The present invention is further configured such that the repair module includes a third transistor, a first end of the third transistor is connected to a second end of the second transistor, a second end of the third transistor is connected to an anode of the backup pixel light emitting diode, and a gate end of the third transistor is connected to the detection module.

[0013] The present invention is further configured such that the gate signal line provides a scanning signal for controlling the on and off of the first transistor; and the data signal line is used to provide a data signal.

[0014] According to a further configuration of the present invention, the pixel circuit further includes a second resistor, a first end of the second resistor is connected to the cathode of the standby pixel light emitting diode, and a second end of the second resistor is connected to the negative electrode of the power supply.

[0015] According to a further configuration of the present invention, the first transistor, the second transistor, the third transistor and the fourth transistor are all P-type transistors.

[0016] The present invention further provides a display substrate, which includes a plurality of pixel units, and the pixel units include the pixel circuit.

[0017] The present invention also provides a display device, which includes the display substrate.

[0018] The present invention provides a pixel circuit, a display substrate and a display device, wherein the pixel circuit includes a driving module, a detection module, a repair module, an original pixel light emitting diode and a spare pixel light emitting diode; the driving module is connected to the original pixel light emitting diode and the repair module; the original pixel light emitting diode is connected to the detection module and the repair module; the repair module is connected to the spare pixel light emitting diode and the detection module; the driving module is connected to a gate signal line and a data signal line; wherein the detection module is used to output a control signal to the repair module according to the output signal of the original pixel light emitting diode; the repair module supplies power to the spare pixel light emitting diode according to the control signal. The present invention automatically detects whether the original pixel light emitting diode is damaged through the detection module, and uses the spare pixel light emitting diode to replace the original pixel light emitting diode to achieve the purpose of repairing the pixel, thereby ensuring the display effect of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0020] Figure 1 It is a functional module schematic diagram of a pixel circuit in the present invention.

[0021] Figure 2 It is a circuit principle diagram of a pixel circuit in an embodiment of the present invention.

[0022] Figure 3 It is a circuit principle diagram of a pixel circuit in another embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention provides a pixel circuit, a display substrate and a display device. The pixel circuit of the present invention can turn on another spare sub-pixel to emit light when detecting that one of the sub-pixels is broken, and perform brightness compensation to ensure the display effect of the display device. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] In the embodiments and patent claims, unless otherwise specified, "a", "an" and "the" may refer to a single or a plurality of items.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] See also Figure 1 and Figure 2 , the present invention provides a preferred embodiment of a pixel circuit.

[0027] like Figure 1 As shown, a pixel circuit includes a driving module 10, a detection module 20, a repair module 30, an original pixel light emitting diode 40 and a spare pixel light emitting diode 50. Specifically, the driving module 10 is connected to the original pixel light emitting diode 40 and the repair module 30, the original pixel light emitting diode 40 is connected to the detection module 20 and the repair module 30, and the repair module 30 is connected to the spare pixel light emitting diode 50 and the detection module 40, wherein the driving module 10 is connected to a gate signal line G and a data signal line D. The detection module 20 is used to output a control signal to the repair module 30 according to the output signal of the original pixel light emitting diode 40, and the repair module 30 supplies power to the spare pixel light emitting diode 50 according to the control signal. The gate signal line G provides a scanning signal, and the data signal line D provides a data signal. The driving module 10 is used to power the repair circuit 30 and the original pixel light-emitting diode 40 according to the received scanning signal of the gate signal line G and the data signal of the data signal line D. When the original pixel light-emitting diode 40 works normally, the repair module 30 is in a disconnected state and does not work. The driving module 10 powers the original pixel light-emitting diode 40. When the detection module 20 detects that the original pixel light-emitting diode 40 is damaged, the driving module 10 powers the repair module 30, and the detection module 20 outputs a control signal to the repair module 30. The repair module 30 powers the spare pixel light-emitting diode 50 according to the control signal, that is, the spare pixel light-emitting diode 50 is used to replace the original pixel light-emitting diode 40 to achieve the purpose of repairing the pixel, so that brightness compensation can be performed, thereby ensuring the display effect of the display device.

[0028] See also Figure 1 and Figure 2In a further implementation of an embodiment, the driving module 10 includes a first transistor T1, a second transistor T2 and a capacitor C1; the first end of the first transistor T1 is connected to the data signal line D, the second end of the first transistor T1 is connected to the gate end of the second transistor T2, the first end of the capacitor C1 and the repair module 30, the gate end of the first transistor T1 is connected to the gate signal line G, the first end of the second transistor T2 is connected to the second end of the capacitor C1 and the positive power supply VDD, and the second end of the second transistor T2 is connected to the anode of the original pixel light emitting diode 40. The gate signal line G provides a scanning signal for controlling the opening and closing of the first transistor T1. When the scanning signal is at a high level, the first transistor T1 is in an open state, and when the scanning signal is at a low level, the first transistor T1 is in a closed state. The data signal line D is used to provide a data signal. When the data signal is at a high level, the second transistor T2 and the third transistor T3 are in an open state, and when the data signal is at a low level, the second transistor T2 and the third transistor T3 are in a closed state. When the first transistor T1 is turned on (the scan signal is at a high level), the data signal (the data signal is at a high level) is transmitted to the second transistor T2 and the repair module 30 through the first transistor T1 to control the second transistor T2 and the repair module 30 to be turned on.

[0029] Please continue reading Figure 1 and Figure 2 In a further implementation of an embodiment, the detection module 20 includes a first resistor R1, the first end of the first resistor R1 is connected to the cathode of the original pixel light emitting diode 40 and the repair module 30, that is, the control end (i.e., node P1) of the first resistor R1 is connected to the repair module 30, the second end of the first resistor R1 is connected to the negative electrode VSS (grounded) of the power supply, and the repair module 30 is connected to the positive electrode VDD of the power supply. When the original pixel light emitting diode 40 works normally, the first resistor R1 divides the voltage, and the node P1 is at a high level at this time. The repair module 30 and the spare pixel light emitting diode 50 are in a disconnected state, and the spare pixel light emitting diode 50 does not work. When the original pixel light emitting diode 50 is broken, the node P1 is at a low level at this time, the data voltage flows through the repair module 30, and combined with the voltage provided by the positive electrode VDD of the power supply, a signal is provided to the spare pixel light emitting diode 50 to repair the broken original pixel light emitting diode.

[0030] Please continue reading Figure 1 and Figure 2In a further implementation of an embodiment, the repair module 30 includes a third transistor T3 and a fourth transistor T4, the first end of the third transistor T3 is connected to the positive power supply VDD, the second end of the third transistor T3 is connected to the first end of the fourth transistor T4, the gate end of the third transistor T3 is connected to the first end of the capacitor C1, the second end of the fourth transistor T4 is connected to the anode of the spare pixel light emitting diode 50, and the gate end of the fourth transistor T4 is connected to the control end (node ​​P1) of the first resistor R1.

[0031] Please continue reading Figure 1 and Figure 2 In a further implementation of an embodiment, the pixel circuit also includes a second resistor R2, the second resistor R2 is a load resistor, the first end of the second resistor R2 is connected to the cathode of the backup pixel light emitting diode 50, and the second end of the second resistor R2 is connected to the negative electrode of the power supply VSS (ground).

[0032] Please continue reading Figure 1 and Figure 2 In a specific implementation, when the original pixel light emitting diode 40 can work normally, the scanning signal of the gate signal line G controls the opening and closing of the first transistor T1. When the scanning signal of the gate signal line G (the scanning signal is at a high level) controls the first transistor T1 to turn on, the data signal of the data signal line D (the data signal is at a high level) enters the gate terminal of the second transistor T2 and the gate terminal of the third transistor T3 through the first transistor T1, and is temporarily stored by the capacitor C1, where the capacitor C1 can prevent the voltage drift of the gate terminal of the second transistor T2 and the gate terminal of the third transistor T3. When the data signal of the data signal line D is at a high level, the second transistor T2 and the third transistor T3 are in the on state, and the positive power supply VDD supplies power to the pixel light emitting diode. At this time, when the original pixel light emitting diode 40 can work normally, due to the voltage division of the first resistor R1, the control end node P1 of the first resistor R1 is a high voltage, so that the fourth transistor T4 is disconnected due to the high level signal provided by the P1 node, so the power provided by the third transistor T3 cannot supply power to the standby pixel light emitting diode 50 through the fourth transistor T4, and the standby pixel light emitting diode 50 does not work, while the original pixel light emitting diode 40 can emit light normally. When the original pixel light emitting diode 40 cannot work normally (disconnected), the first resistor R1 cannot divide the voltage, so the voltage of the node P1 is a low voltage, and the fourth transistor T4 is turned on due to the low level signal provided by the node P1 and is in an on state, so that the power provided by the third transistor T3 supplies power to the standby light emitting diode 50 through the fourth transistor T4, so that the standby pixel light emitting diode 50 emits light to repair the broken original pixel light emitting diode 40.

[0033] In a further implementation of an embodiment, the first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4 are all P-type transistors. It should be noted that the first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4 can also be set as N-type transistors, and it is only necessary to swap the anode and cathode of the original pixel light emitting diode 40, and swap the positive power supply VDD and the negative power supply VSS. The principle of using the first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4 as N-type transistors is similar to the principle of using P-type transistors, which will not be repeated here.

[0034] See also Figure 1 and Figure 3 , the present invention provides another embodiment of a pixel circuit. The difference from the above embodiment is that the repair module 30 only includes a third transistor T3, the first end of the third transistor T3 is connected to the second end of the second transistor T2, the second end of the third transistor T3 is connected to the anode of the spare pixel light emitting diode 50, and the gate end of the third transistor T3 is connected to the detection module 20. In other words, the spare pixel light emitting diode 50 and the original pixel light emitting diode 40 share a second transistor T2 for power supply, so compared with the previous embodiment, one transistor is saved. The principle of repairing pixels in this embodiment is similar to that in the above embodiment, so it is not repeated here.

[0035] See also Figure 1 and Figure 2 The present invention also provides a display substrate, the display substrate includes a plurality of pixel units, the pixel units include a pixel circuit, the pixel circuit includes a driving module 10, a detection module 20, a repair module 30, an original pixel light emitting diode 40 and a spare pixel light emitting diode 50, the driving module 10 is connected to the original pixel light emitting diode 40 and the repair module 30, the original pixel light emitting diode 40 is connected to the detection module 20 and the repair module 30, the repair module 30 is connected to the spare pixel light emitting diode 50 and the detection module 40, and the driving module 10 is connected to a gate signal line G and a data signal line D. The detection module 20 is used to output a control signal to the repair module 30 according to the output signal of the original pixel light emitting diode 40, and the repair module 30 supplies power to the spare pixel light emitting diode 50 according to the control signal. The details are as described above and will not be repeated here.

[0036] See also Figure 1 and Figure 2The present invention also provides a display device, which includes a display substrate, the display substrate includes a plurality of pixel units, the pixel unit includes a pixel circuit, the pixel circuit includes a driving module 10, a detection module 20, a repair module 30, an original pixel light emitting diode 40 and a spare pixel light emitting diode 50, the driving module 10 is connected to the original pixel light emitting diode 40 and the repair module 30, the original pixel light emitting diode 40 is connected to the detection module 20 and the repair module 30, the repair module 30 is connected to the spare pixel light emitting diode 50 and the detection module 40, and the driving module 10 is connected to a gate signal line G and a data signal line D. The detection module 20 is used to output a control signal to the repair module 30 according to the output signal of the original pixel light emitting diode 40, and the repair module 30 supplies power to the spare pixel light emitting diode 50 according to the control signal. The details are as described above and will not be repeated here.

[0037] In summary, the present invention provides a pixel circuit, a display substrate and a display device, wherein the pixel circuit includes a driving module, a detection module, a repair module, an original pixel light emitting diode and a spare pixel light emitting diode; the driving module is connected to the original pixel light emitting diode and the repair module; the original pixel light emitting diode is connected to the detection module and the repair module; the repair module is connected to the spare pixel light emitting diode and the detection module; the driving module is connected to a gate signal line and a data signal line; wherein the detection module is used to output a control signal to the repair module according to the output signal of the original pixel light emitting diode; the repair module supplies power to the spare pixel light emitting diode according to the control signal. The present invention automatically detects whether the original pixel light emitting diode is damaged through the detection module, and uses the spare pixel light emitting diode to replace the original pixel light emitting diode to achieve the purpose of repairing the pixel, thereby ensuring the display effect of the display device.

[0038] It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made based on the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A pixel circuit, characterized in that: It includes a driving module, a detection module, a repair module, an original pixel light emitting diode and a spare pixel light emitting diode; the driving module is connected to the original pixel light emitting diode and the repair module; The original pixel light emitting diode is connected to the detection module and the repair module; The repair module is connected to the spare pixel light emitting diode and the detection module; The driving module is connected to a gate signal line and a data signal line; The detection module is used to output a control signal to the repair module according to the output signal of the original pixel light emitting diode, and the detection module includes a first resistor, a first end of the first resistor is connected to the cathode of the original pixel light emitting diode and the repair module, and a second end of the first resistor is connected to the negative electrode of the power supply; the repair module supplies power to the spare pixel light emitting diode according to the control signal; The driving module includes a first transistor, a second transistor and a capacitor; the first end of the first transistor is connected to the data signal line, the second end of the first transistor is connected to the gate end of the second transistor, the first end of the capacitor and the repair module, and the gate end of the first transistor is connected to the gate signal line; the first end of the second transistor is connected to the second end of the capacitor and the positive pole of the power supply, and the second end of the second transistor is connected to the anode of the original pixel light-emitting diode.

2. The pixel circuit according to claim 1, characterized in that: The repair module includes a third transistor and a fourth transistor; the first end of the third transistor is connected to the positive pole of the power supply, the second end of the third transistor is connected to the first end of the fourth transistor, and the gate end of the third transistor is connected to the first end of the capacitor; the second end of the fourth transistor is connected to the anode of the spare pixel light emitting diode, and the gate end of the fourth transistor is connected to the detection module.

3. The pixel circuit according to claim 1, characterized in that: The repair module includes a third transistor, a first end of the third transistor is connected to the second end of the second transistor, a second end of the third transistor is connected to the anode of the spare pixel light emitting diode, and a gate end of the third transistor is connected to the detection module.

4. The pixel circuit according to claim 2, characterized in that: The gate signal line provides a scanning signal for controlling the on and off of the first transistor; the data signal line is used to provide a data signal.

5. The pixel circuit according to claim 1, characterized in that: A second resistor is also included, wherein a first end of the second resistor is connected to the cathode of the standby pixel light emitting diode, and a second end of the second resistor is connected to the negative electrode of the power supply.

6. The pixel circuit according to claim 2, characterized in that: The first transistor, the second transistor, the third transistor and the fourth transistor are all P-type transistors.

7. A display substrate, characterized in that: The display substrate comprises a plurality of pixel units, and the pixel units comprise the pixel circuit according to any one of claims 1 to 6.

8. A display device, characterized in that: Comprising the display substrate as claimed in claim 7.

Images