TWI719761B - Reverse current detection circuit and display apparatus thereof - Google Patents

Abstract

The present disclosure relates to a reverse current detection circuit for dynamically adjusting the reverse current on a source line under a display period. The reverse current detection circuit includes a detection unit, a comparison unit, and a control unit. The detection unit detects a reverse current on a specified source line under a non-display period and calculates a reference current based on the detected reverse current. The comparison unit compares the reference current with a specified forward current. When the reference current is larger than the specified forward current, the comparison unit outputs a first control signal, the control unit sinks a specified current from the specified source line in response to the first control signal. When the reference current is less than the specified forward current, the comparison unit outputs a second control signal, the control unit provides a compensation current to the specified source line in response to the second control signal. A related display apparatus with the reverse current detection circuit is also provided.

Description

Reverse current detection circuit and display device with reverse current detection circuit

The invention relates to a reverse current detection circuit and a display device with the reverse current detection circuit.

The display area of the display device includes a plurality of mutually parallel gate lines and a plurality of mutually parallel source lines. A plurality of gate lines and a plurality of source lines are staggered, and a plurality of pixel units are defined at the staggered positions. The pixel unit is electrically connected to the source driver through the source line, and electrically connected to the gate driver through the gate line. The pixel unit includes at least one light emitting diode. The positive electrode of the light-emitting diode is electrically connected to the source line, and the negative electrode of the light-emitting diode is electrically connected to the gate line. When the pixel unit is driven, the corresponding gate line is loaded with a forward bias voltage, so that the light-emitting diode is turned on and emits light; when it is not driven, the corresponding gate line is loaded with a reverse bias voltage to make the light-emitting diode The pole body cuts off and stops emitting light. The reverse bias voltage can cause the light-emitting diode to generate a reverse current on the source line. When the number of pixel units increases, the more accumulated reverse currents will result in the inability to display images in the absolutely dark state, which will affect the display effect of the display device.

The present invention provides a reverse current detection circuit, which is electrically connected to multiple pixel units through multiple source lines, the reverse current detection circuit is used to dynamically adjust the reverse current on the source line in the display stage; the reverse current The detection circuit includes: The detection unit is electrically connected to a plurality of the source lines, and is used to detect the reverse current on the target source line in the non-display phase, and calculate a reference current according to the reverse current; the target source line Is the source line corresponding to the driven pixel unit; the reference current is the pixel unit that the driven pixel unit is in the display stage and is electrically connected to the same target source line The total leakage current in the non-display phase; a comparison unit, electrically connected to the detection unit, for comparing the reference current with a target forward current; the target forward current is the driven The current generated when the light-emitting diode in the pixel unit is turned on; when the reference current is greater than the target forward current, the comparison unit outputs a first control signal; when the reference current is less than the target forward current When the current is current, the comparison unit outputs a second control signal; when the reference current is equal to the target forward current, the comparison unit outputs a third control signal; The source line is electrically connected to draw a specified current from the target source line when the first control signal is received, and to provide compensation to the target source line when the second control signal is received The current stops working when the third control signal is received.

The present invention also provides a display device with a reverse current detection circuit, which includes: at least one reverse current detection circuit as described above; multiple gate lines arranged in parallel with each other; multiple source lines arranged in parallel with each other A plurality of the gate lines are staggered to define a plurality of pixel units; a source driver is electrically connected to the pixel units through a plurality of the source lines; the source driver includes a reverse current detection circuit The reverse current detection circuit is used to dynamically adjust the reverse current on the target source line; the target source line is the source line corresponding to the pixel unit being driven; the reverse current detection circuit can work in the pull Current mode, sink current mode, and loss Effective mode; In the source current mode, the reverse current detection circuit outputs a compensation current to the target source line; In the sink current mode, the reverse current detection circuit is drawn from the target source line Specify current; in the failure mode, the reverse current detection circuit stops working.

The above-mentioned reverse current detection circuit and the display device with the reverse current detection circuit detect the leakage current on the target source line and compare it with the corresponding forward current. According to the comparison result, the current on the source line is extracted or compensated to avoid the reverse The effect of current on the dark state, the current on the source line is precisely controlled to ensure the reliability of the display effect.

1: display device

11: Display area

13: Non-display area

G1~Gn, Gi: gate line

S1~Sm, Sk: source line

10: Pixel unit

D1-1~Dn-m: Light-emitting diode

20: Gate driver

30: source driver

300: Reverse current detection circuit

31: Detection unit

32: comparison unit

34: control unit

341: switch circuit

343: Extraction Circuit

345: input circuit

VL: first voltage source

VH: second voltage source

SW1: The first switch

SW2: second switch

A1: The first controlled current source

A2: Second controlled current source

R1: The first adjustable resistor

R2: second adjustable resistor

FIG. 1 is a three-dimensional schematic diagram of a display device according to a preferred embodiment.

FIG. 2 is a schematic plan view of the display device in FIG. 1.

FIG. 3 is a schematic diagram of a module of the source driver in FIG. 2.

FIG. 4 is a schematic circuit diagram of the control unit of the first embodiment in FIG. 3.

FIG. 5 is a schematic circuit diagram of the control unit of the second embodiment in FIG. 3.

6a-6c are schematic diagrams of waveforms of a source line current in FIG. 2 under different conditions.

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly defined and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. ; It can be a mechanical connection, an electrical connection, or a mutual communication; it can be a direct connection, or an indirect connection without an intermediate connection, it can be a connection between two components or an interaction relationship between two components. For those of ordinary skill in the art, the specific meaning of the above-mentioned terms in the present invention can be immediately determined according to the specific situation.

The terms "first", "second", and "third" in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the term "including" and any variations of them are intended to cover non-exclusive inclusion.

The specific implementation of the display device of the present invention will be described below with reference to the accompanying drawings.

Please refer to FIG. 1, which is a perspective view of a display device 1 according to a preferred embodiment of the present invention. The display device 1 can be applied to a variety of electronic devices with display structures, such as desktop displays, tablet computers, personal digital assistants (PDAs), car dashboards, and wearable display devices, but is not limited thereto.

Please also refer to FIG. 2, which is a schematic plan view of the display device 1 of the preferred embodiment. The display device 1 is defined with a display area 11 and a non-display area 13 provided around the display area 11. The display area 11 includes a plurality of mutually parallel gate lines G1 ˜Gn and a plurality of mutually parallel source lines S1 ˜Sm. Among them, m and n are positive integers. A plurality of gate lines G1~Gn extend along a first direction X, and a plurality of source lines S1~Sm extend along a second direction Y perpendicular to the first direction X, interlacing each other to define a grid shape, and the hollow of the grid A plurality of pixel units 10 arranged in a matrix are defined. Understandably, the multiple gate lines G1~Gn and source lines S1~Sm of the display device 1 of this embodiment can be arranged as needed, for example, the gate lines G1~Gn and the source lines S1~Sm are not orthogonal Stagger, but oblique stagger, is not limited to this embodiment. The display device 1 includes n*m light emitting diodes D1-1 to Dn-m. Light-emitting diodes D1-1~Dn-m can include red light-emitting diodes R-LED, green light-emitting diodes G-LED and blue light-emitting diode B-LED. In other embodiments, the light-emitting diodes D1-1 to Dn-m may also include white light-emitting diodes W-LED or light-emitting diodes of other colors. In this embodiment, each pixel unit 10 includes a light emitting diode D(n-m). In other embodiments, the pixel unit 10 may further include a switching transistor, a driving transistor, a reset transistor, and so on. When the pixel unit 10 at the intersection of the target gate line Gi and the target source line Sk is driven, the signal on the target gate line Gi is valid and the data voltage is loaded on the target source line Sk. The light-emitting diode LED is turned on to generate a forward current I(i,k). The forward current I(i,k) is proportional to the voltage on the target source line Sk. That is, when the voltage on the target source line Sk becomes larger, the corresponding forward current I(i,k) becomes larger. When the voltage on the target source line Sk becomes smaller, the corresponding forward current I(i,k) becomes smaller. ) Becomes smaller. A gate driver 20 and a source driver 30 are provided in the non-display area 13. Each pixel unit 10 is electrically connected to the gate driver 20 through a gate line Gi, and is electrically connected to the source driver 30 through a source line Sk. In this embodiment, the gate driver 20 and the source driver 30 can be connected to the display panel by means of automatic bonding (tape-automated bonding, TAB) or chip-on-glass (COG). The bonding pads (not shown) can also be directly formed on the display panel through a (gate-in-panel, GIP) method. In other embodiments, the gate driver 20 and the source driver 30 can also be directly integrated on the display panel as a part of the display panel. In other embodiments, the display device 1 further includes a timing controller (not shown). The timing controller is used to provide multiple synchronization control signals (not shown) to the gate driver 20 and the source driver 30 to drive the gate driver 20 and the source driver 30. Among them, the multiple synchronization control signals may include horizontal synchronization (Vsync), vertical synchronization (Vsync), clock (clock, CLK), data enable (EN), and so on.

Please also refer to FIG. 3, the source driver 30 includes a reverse current detection circuit 300 electrically connected to the source lines S1 ˜Sm. The reverse current detection circuit 300 is used to dynamically adjust the Reverse current on the target source line Sk. The reverse current detection circuit 300 can work in a current source mode, a current sink mode, and a failure mode. Among them, in the source current mode, the reverse current detection circuit 300 outputs a compensation current to the target source line Sk; in the sink current mode, the reverse current detection circuit 300 draws a specified current from the target source line Sk. In the failure mode, the reverse current detection circuit 300 stops working.

<n，0<k

m。 The reverse current detection circuit 300 detects the reverse current Ir on the target source line Sk during the non-display phase Toff, and calculates the reference current Is based on the detected reverse current Ir. The reverse current detection circuit 300 is also used to obtain the target forward current I(i,k), compare the reference current Is with the obtained target forward current I(i,k), and control the reverse current detection circuit 300 to work according to the comparison result In source current mode, sink current mode or failure mode. The target forward current I(i,k) is the forward current of the light emitting diode LED in the corresponding pixel unit 10 determined by the target gate line Gi and the target source line Sk. The target gate line Gi is a gate line loaded with a valid signal, and the target source line Sk is a source line loaded with a data voltage. When the reference current Is is greater than the target forward current I(i,k), the reverse current detection circuit 300 operates in the sink current mode and draws a specified current from the target source line Sk; when the reference current Is is less than the target target forward current I (i,k), the reverse current detection circuit 300 works in the current source mode and provides compensation current to the target source line Sk; when the reference current Is is equal to the target forward current I(i,k), the reverse current detection circuit 300 works in the failure mode, and stops drawing a specified current from the target source line Sk or provides a compensation current to the target source line Sk. In this embodiment, i and k are positive integers, 0<i

<n, 0<k

m.

The reverse current detection circuit 300 includes a detection unit 31, a comparison unit 32 and a control unit 34. The detection unit 31 is electrically connected to the source lines S1~Sm, and is used to detect the reverse current Ir on the target source line Sk in the non-display phase Toff, and calculate the reference current Is based on the detected reverse current Ir . The reverse current Ir is related to the number n of the gate lines G1 to Gn and the leakage current Ileak generated by the light emitting diode LED in the corresponding pixel unit 10 driven by the reverse voltage. Among them, Ir=n*Ileak. LEDs of different colors have different leakage currents Ileak. In this embodiment, the leakage current Ileak generated by the red light-emitting diode R-LED driven by the reverse voltage is 5μA, and the leakage current Ileak generated by the green light-emitting diode G-LED driven by the reverse voltage is 2μA, the leakage current Ileak generated by the blue light-emitting diode B-LED driven by the reverse voltage is 2μA. The reference current Is is the sum of the leakage currents on the corresponding source line Sk when the corresponding pixel unit 10 is in the display phase Ton and other pixel units 10 in the same line are at the non-display extreme Toff. Among them, Is=(n-1)*Ir/n.

The comparison unit 32 is electrically connected to the detection unit 31. The comparing unit 32 is used to obtain the target forward current I(i,k), compare the reference current Is with the obtained target forward current I(i,k), and output different control signals according to the comparison result. When the reference current Is is greater than the target forward current I(i,k), the comparison unit 32 generates a first control signal; when the reference current Is is equal to the target forward current I(i,k), the comparison unit 32 generates a second control signal Signal; when the reference current Is is less than the target forward current I(i,k), the comparison unit 32 generates a third control signal.

The control unit 34 is electrically connected to the comparison unit 32 and the source lines S1~Sm. The control unit 34 draws a specified current from the target source line Sk according to the first control signal. The specified current is the difference between the reference current Is and the target forward current I(i,k). The control unit 34 provides a compensation current to the target source line Sk according to the second control signal. Among them, the compensation current is the difference between the reference current Is and the target forward current I(i,k). The control unit 34 stops working according to the third control signal to stop drawing a specified current from the target source line Sk and stop supplying a compensation current to the target source line Sk.

The control unit 34 includes a switch circuit 341, an extraction circuit 343, and an input circuit 345.

The switch circuit 341 is electrically connected to the source lines S1 to Sm, the extraction circuit 343, and the input circuit 345, respectively. The switch circuit 341 establishes an electrical connection between the extraction circuit 343 and the target source line Sk when receiving the first control signal. The switch circuit 341 establishes an electrical connection between the input circuit 345 and the target source line Sk when receiving the second control signal. The switch circuit 341 receives the third control signal At the time of the signal, the electrical connection between the extraction circuit 343 and the target source line Sk is disconnected and the electrical connection between the input circuit 345 and the target source line Sk is disconnected.

The extraction circuit 343 is connected between the first voltage source V _L and the switch circuit 341. The extraction circuit 343 is used to draw a specified current from the target source line Sk.

The input circuit 345 is connected between the second voltage source V _H and the switch circuit 341. An input circuit 345 for supplying a compensation current to the source line Sk target according to a second voltage source V _H. The voltage of the first voltage source V _L is less than the voltage of the second voltage source V _H. In this embodiment, the voltage of the first voltage source V _L is a low voltage, which may be 0V, and the voltage of the second voltage source V _H is a high level, which may be 3V. In other embodiments, the voltage of the second voltage source V _H can be adjusted according to requirements.

Please refer to FIG. 4, which is a schematic circuit diagram of the control unit 34 of the first embodiment. For ease of description, only the target source line S1 is shown in FIG. 4. Understandably, the control unit 34 is substantially electrically connected to all the source lines S1 to Sm. In this embodiment, the switch circuit 341 includes a first switch SW1 and a second switch SW2. Wherein, the first switch SW1 is electrically connected between the extraction circuit 343 and the target source line S1. The second switch SW2 is electrically connected between the input circuit 345 and the target source line S1.

The extraction circuit 343 includes a first controlled current source A1. The first controlled current source A1 is electrically connected between the first voltage source V _L and the first switch SW1. Among them, the first controlled current source A1 can adjust the magnitude of the extracted current under the control of the driving network (not shown).

The input circuit 345 includes a second controlled current source A2. The second controlled current source A2 is electrically connected between the second voltage source _VH and the second switch SW2. Among them, the second controlled current source A2 can adjust the output current under the control of the driving network (not shown).

Please refer to FIG. 5, which is a schematic circuit diagram of the control unit 34 of the second embodiment. For the convenience of description, only the target source line S1 is shown in FIG. 5. Understandably, the control unit 34 is substantially electrically connected to all the source lines S1 to Sm. In this embodiment, the switch circuit 341 includes a A switch SW1 and a second switch SW2. Wherein, the first switch SW1 is electrically connected between the extraction circuit 343 and the target source line S1. The second switch SW2 is electrically connected between the input circuit 345 and the target source line S1.

The extraction circuit 343 includes a first adjustable resistor R1. The first adjustable resistor R1 is electrically connected between the first voltage source V _L and the first switch SW1. Wherein, the first adjustable resistor R1 can adjust the magnitude of the extracted current by adjusting its own resistance value.

The input circuit 345 includes a second adjustable resistor R2. The second adjustable resistor R2 is electrically connected between the second voltage source _VH and the second switch SW2. Among them, the second adjustable resistor R2 can adjust its own resistance to adjust the output current.

Take the 1080*1080 matrix as an example to illustrate, that is, n=1080, m=1080. In this embodiment, the light-emitting diode LED in one pixel unit 10 in the first row and first column is a red light-emitting diode R-LED.

In the non-display period Toff, the detection unit 31 detects the reverse current Ir-red on the target source line S1. Among them, Ir=1080*5μA=5.4mA. The detection unit 31 further calculates the reference current Is-red according to the reverse current Ir-red. Is-red=(1080-1)*5.4mA/1080=5.395mA. The comparison unit 32 compares the reference current Is-red with the target forward current I(1, 1). When the reference current Is-red is greater than the target forward current I(1,1), the comparison unit 32 generates the first control signal. The switch circuit 341 establishes an electrical connection between the extraction circuit 343 and the target source line S1 according to the first control signal. The extraction circuit 343 draws a specified current from the target source line S1. Among them, the designated current is the difference between the reference current Is and the target forward current I(i,k). It can be seen from FIG. 6a that during the display phase Ton, the current on the target source line S1 is reduced by the extracting circuit 343.

In the non-display period Toff, the detection unit 31 detects the reverse current Ir-red on the target source line S1. Among them, Ir=1080*5μA=5.4mA. The detection unit 31 further calculates the reference current Is-red according to the reverse current Ir-red. Is-red=(1080-1)*5.4mA/1080=5.395mA. ratio The comparing unit 32 compares the reference current Is-red with the target forward current I(1,1). When the reference current Is-red is equal to the target forward current I(1,1), the comparison unit 32 generates a third control signal. The switch circuit 341 disconnects the electrical connection between the extraction circuit 343 and the target source line S1, and disconnects the electrical connection between the input circuit 345 and the target source line S1 according to the third control signal. It can be seen from FIG. 6b that during the display phase Ton, the current on the target source line S1 is maintained at the target forward current I(1,1).

In the non-display period Toff, the detection unit 31 detects the reverse current Ir-red on the target source line S1. Among them, Ir=1080*5μA=5.4mA. The detection unit 31 further calculates the reference current Is-red according to the reverse current Ir-red. Is-red=(1080-1)*5.4mA/1080=5.395mA. The comparison unit 32 compares the reference current Is-red with the target forward current I(1, 1). When the reference current Is-red is less than the target forward current I(1,1), the comparison unit 32 generates the second control signal. The switch circuit 341 establishes an electrical connection between the input circuit 345 and the target source line S1 according to the second control signal. The input circuit 345 provides a compensation current to the target source line S1. Among them, the compensation current is the difference between the reference current Is and the target forward current I(i,k). It can be seen from FIG. 6c that, during the display phase Ton, the current on the target source line S1 increases under the action of the input circuit 345.

The above-mentioned display device 1 with the reverse current detection circuit 300 detects the leakage current on the target source line Sk and compares it with the corresponding forward current I(i,k). According to the comparison result, the current on the source line Sk is measured. Extraction or compensation can avoid the influence of the reverse current on the dark state display, and accurately control the current on the source line to ensure the reliability of the display effect.

In summary, the present invention meets the requirements of an invention patent, and Yan filed a patent application in accordance with the law. However, the above are only the preferred embodiments of the present invention. For those who are familiar with the technique of this case, equivalent modifications or changes made in accordance with the creative spirit of this case should be included in the scope of the following patent applications.

300: Reverse current detection circuit

10: Pixel unit

S1~Sm: source line

31: Detection unit

32: comparison unit

34: control unit

341: switch circuit

343: Extraction Circuit

345: input circuit

Claims (13)

A reverse current detection circuit is electrically connected to multiple pixel units through multiple source lines. The reverse current detection circuit is used to dynamically adjust the reverse current on the source line in the display stage; the reverse current detection circuit includes : A detecting unit, electrically connected to a plurality of the source lines, for detecting a reverse current on the target source line in the non-display phase, and calculating a reference current according to the reverse current; the target source The line is the source line corresponding to the driven pixel unit; the reference current is the pixel that is in the display stage of the driven pixel unit and is electrically connected to the same target source line The sum of the leakage current when the unit is in the non-display phase; the comparison unit is electrically connected to the detection unit for comparing the reference current and the target forward current; the target forward current is all driven The current generated when the light-emitting diode in the pixel unit is turned on; when the reference current is greater than the target forward current, the comparison unit outputs a first control signal; when the reference current is less than the target positive current When the current is supplied, the comparison unit outputs a second control signal; when the reference current is equal to the target forward current, the comparison unit outputs a third control signal; and the control unit is connected to the comparison unit and a plurality of The source line is electrically connected to draw a specified current from the target source line when the first control signal is received, and to provide the target source line when the second control signal is received The compensation current stops working when the third control signal is received. The reverse current detection circuit according to claim 1, wherein the reverse current is the difference between the number of gate lines corresponding to the pixel unit and the reverse voltage of the light-emitting diode in the pixel unit being driven The product of the leakage current generated by the drive. The reverse current detection circuit according to claim 1, wherein the control unit includes a switch circuit and an extraction circuit; the switch circuit is connected to a plurality of the source lines and the extraction circuit The extraction circuit is connected between the first voltage source and the switch circuit; the switch circuit establishes between the extraction circuit and the target source line when the first control signal is received The electrical connection; the extraction circuit is used to extract the specified current from the target source line. The reverse current detection circuit according to claim 3, wherein the control unit further includes an input circuit; the input circuit is connected between the switch circuit and a second voltage source; the voltage of the second voltage source is greater than The voltage of the first voltage source; the switch circuit establishes an electrical connection between the input circuit and the target source line when receiving the second control signal; the input circuit is used to supply the The target source line provides the compensation current. The reverse current detection circuit according to claim 4, wherein the extraction circuit is a first controlled current source, and the input circuit is a second controlled current source; by adjusting the output of the first controlled current source The current is used to realize the adjustment of the specified current, and the adjustment of the compensation current is realized by adjusting the output current of the second controlled current source. The reverse current detection circuit according to claim 4, wherein the extraction circuit is a first adjustable resistor, and the input circuit is a second adjustable resistor; the resistance of the first adjustable resistor is adjusted to achieve The adjustment of the specified current is achieved by adjusting the resistance of the second adjustable resistor to achieve the adjustment of the compensation current. The reverse current detection circuit according to claim 1, wherein the specified current is the difference between the reference current and the target forward current; and the compensation current is the reference current and the target forward current The difference. A display device with a reverse current detection circuit, comprising: at least one reverse current detection circuit as described in claim 1; a plurality of gate lines arranged in parallel with each other; a plurality of source lines arranged in parallel with each other The gate lines are staggered to define a plurality of pixel units; The source driver is electrically connected to a plurality of the pixel units through a plurality of the source lines; the source driver includes a reverse current detection circuit; the reverse current detection circuit is used to dynamically adjust the target source line The target source line is the source line corresponding to the pixel unit being driven; the reverse current detection circuit can work in the current source mode, the sink current mode, and the failure mode; in the source current In the mode, the reverse current detection circuit outputs a compensation current to the target source line; in the sink current mode, the reverse current detection circuit draws a specified current from the target source line; in the failure mode Next, the reverse current detection circuit stops working. The display device according to claim 8, wherein the control unit includes a switch circuit, an extraction circuit, and an input circuit; the switch circuit is connected to a plurality of the source lines, the extraction circuit, and the input circuit. The extraction circuit is connected between the first voltage source and the switching circuit; the switching circuit establishes the electrical connection between the extraction circuit and the target source line when receiving the first control signal The extraction circuit is used to extract the specified current from the target source line; the input circuit is connected between the switch circuit and a second voltage source; the voltage of the second voltage source is greater than the The voltage of the first voltage source; the switch circuit establishes an electrical connection between the input circuit and the target source line when receiving the second control signal; the input circuit is used to provide the The target source line provides the compensation current. The display device according to claim 9, wherein the extraction circuit is a first controlled current source, and the input circuit is a second controlled current source; the output current of the first controlled current source is adjusted to The adjustment of the specified current is realized, and the adjustment of the compensation current is realized by adjusting the output current of the second controlled current source. The display device according to claim 9, wherein the extraction circuit is a first adjustable resistor, and the input circuit is a second adjustable resistor; by adjusting the resistance of the first adjustable resistor In order to realize the adjustment of the specified current, the adjustment of the compensation current is realized by adjusting the resistance of the second adjustable resistor. The display device according to claim 8, wherein the specified current is the difference between the reference current and the target forward current; the compensation current is the difference between the reference current and the target forward current value. The display device according to claim 8, wherein the specified current is the number of gate lines corresponding to the pixel unit and the light-emitting diode in the pixel unit being driven is driven by a reverse voltage The product of the resulting leakage current.

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