TWI858653B - Display device and discharge method thereof - Google Patents

Abstract

A display device and a discharge method thereof are provided. The display device includes a display panel, a first discharge control switch, a second discharge control switch and a discharge control circuit. The display panel includes a plurality of scan lines, a plurality of data lines and a plurality of pixel circuits. The pixel circuits are coupled to the scan lines and the data lines correspondingly. A first terminal of the first discharge control switch is coupled to the scan lines. A first terminal of the second discharge control switch is coupled to the data lines. The discharge control circuit is coupled to a second terminal of the first discharge control switch, a control terminal of the first discharge control switch, a second terminal of the second discharge control switch and a control terminal of the second discharge control switch. When at least one of a working voltage and a reset voltage is abnormal, the discharge control circuit has a discharge operation for discharging a data voltage of the pixel circuits through the first discharge control switch and the second discharge control switch.

Description

Display device and discharge method thereof

The present invention relates to a display technology, and in particular to a display device and a discharge method thereof which can perform a discharge operation of a pixel circuit when an abnormal power failure occurs in the display device.

When a display device is powered off without a normal shutdown procedure, the pixel circuit on a display panel, such as a liquid crystal display (LCD), will have a charge residue problem, which will cause panel afterimages or liquid crystal polarization. Specifically, when a display device is powered off without a normal shutdown procedure, the scan lines on the display panel in the display device are still at a low voltage level. Accordingly, the thin film transistor (TFT) in the pixel circuit is still in the disconnected state, making the discharge behavior of the pixel circuit very slow. As a result, the charge will remain in the pixel circuit for a long time, causing the display panel to have afterimages or liquid crystal polarization.

In view of this, the present invention provides a display device and a discharge method thereof, which can perform a discharge operation of a pixel circuit when an abnormal power failure occurs in the display device.

The present invention provides a display device, including a display panel, a first discharge control switch, a second discharge control switch and a discharge control circuit. The display panel includes a plurality of scan lines, a plurality of data lines and a plurality of pixel circuits. The plurality of pixel circuits are coupled correspondingly to the plurality of scan lines and the plurality of data lines. The first end of the first discharge control switch is coupled to the plurality of scan lines. The first end of the second discharge control switch is coupled to the plurality of data lines. The discharge control circuit is coupled to the second end of the first discharge control switch, the control end of the first discharge control switch, the second end of the second discharge control switch and the control end of the second discharge control switch. When at least one of the operating voltage and the reset voltage of the display device is abnormal, the discharge control circuit has a discharge operation of discharging the data voltage located in the plurality of pixel circuits through the first discharge control switch and the second discharge control switch.

The present invention provides a discharge method for a display device. The display device includes a display panel, a first discharge control switch, and a second discharge control switch. The display panel includes a plurality of scan lines, a plurality of data lines, and a plurality of pixel circuits. The first end of the first discharge control switch is coupled to the plurality of scan lines. The first end of the second discharge control switch is coupled to the plurality of data lines. The discharge method includes: receiving at least one of an operating voltage and a reset voltage of the display device; determining whether at least one of the operating voltage and the reset voltage is abnormal; when at least one of the operating voltage and the reset voltage is abnormal, turning on the first discharge control switch and the second discharge control switch; and discharging the data voltage located in the plurality of pixel circuits through the first discharge control switch and the second discharge control switch.

Based on the above, the display device and the discharge method provided by the present invention can discharge the data voltages in multiple pixel circuits by turning on the switch through the discharge control circuit when at least one of the working voltage and the reset voltage of the display device is abnormal. In this way, the image residue or liquid crystal polarization problems of the display panel can be reduced.

Some embodiments of the present invention will be described in detail below with reference to the drawings. When the same element symbols appear in different drawings, they will be regarded as the same or similar elements. These embodiments are only part of the present invention and do not disclose all possible implementations of the present invention. More precisely, these embodiments are only examples within the scope of the patent application of the present invention.

Please refer to FIG. 1 , which shows a schematic diagram of a display device of an embodiment of the present invention. The display device 10 is, for example, a liquid crystal display (LCD), a light-emitting diode (LED), an organic light-emitting diode (OLED), or the like, which provides a display function. In the present embodiment, the display device 10 includes a display panel 100, discharge control switches S1, S2, and a discharge control circuit 200. The display panel 100 includes scan lines 110-1~110-m, data lines 120-1~120-n, and a pixel circuit 130. The number of scan lines and the number of data lines can be set according to actual design requirements, and the present invention is not limited to the number of scan lines and the number of data lines of the present embodiment. The pixel circuit 130 is coupled to the corresponding scan line and the corresponding data line respectively. In this embodiment, the first end of the discharge control switch S1 is coupled to the scan lines 110-1 to 110-m. The first end of the discharge control switch S2 is coupled to the data lines 120-1 to 120-n. The discharge control circuit 200 is coupled to the second end of the discharge control switch S1, the control end of the discharge control switch S1, the second end of the discharge control switch S2, and the control end of the discharge control switch S2.

In this embodiment, the discharge control circuit 200 detects at least one of the operating voltage VDD and the reset voltage VR. For example, when at least one of the operating voltage VDD and the reset voltage VR is abnormal, the voltage value of the abnormal operating voltage VDD or/and the reset voltage VR is lower than the voltage value of the threshold voltage. In other words, when the operating voltage VDD or/and the reset voltage VR of the display device 10 is lower than the voltage value of the threshold voltage, the discharge control circuit 200 determines that an abnormal power-off event occurs in the display device 10. Therefore, the discharge control circuit 200 performs a discharge operation on the pixel circuit 130. When the voltage values of the operating voltage VDD and the reset voltage VR of the display device 10 are both higher than or equal to the voltage value of the threshold voltage, the discharge control circuit 200 determines that an abnormal power-off event does not occur in the display device 10 .

When at least one of the operating voltage VDD and the reset voltage VR of the display device 10 is abnormal, the discharge control circuit 200 has a discharge operation to discharge the data voltage located in the pixel circuit 130 through the discharge control switches S1 and S2. Specifically, when at least one of the operating voltage VDD and the reset voltage VR is abnormal, the discharge control circuit 200 turns on the discharge control switches S1 and S2. The discharge control circuit 200, for example, connects the second end of the discharge control switch S1 to the reference high voltage VH and turns on the discharge control switch S1. The scanning lines 110-1~110-m are connected to the reference high voltage VH. Accordingly, all the pixel circuits 130 are selected. The discharge control circuit 200 connects the second end of the discharge control switch S2 to the reference low voltage VL and turns on the discharge control switch S1. Accordingly, the discharge control switch S2 uses the reference low voltage VL to discharge all data voltages in the pixel circuit 130. When at least one of the operating voltage VDD and the reset voltage VR of the display device 10 is abnormal, the data voltage may include a residual voltage in the pixel circuit 130 that is not normally discharged.

Thus, when an abnormal power failure occurs in the display panel 100 (ie, at least one of the working voltage VDD and the reset voltage VR is abnormal), the discharge control circuit 200 performs a discharge operation on all pixel circuits 130 to reduce problems such as image residue or liquid crystal polarization of the display panel 100 .

On the other hand, when there is no abnormality in the operating voltage VDD and the reset voltage VR, the discharge control circuit 200 turns off the discharge control switches S1 and S2.

In the present embodiment, the display panel 100 further includes a common electrode Vcom corresponding to the pixel circuit 130. The common electrode Vcom is coupled to the first end of the discharge control switch S2. Therefore, when at least one of the working voltage VDD and the reset voltage VR is abnormal, the turned-on discharge control switch S2 connects the common electrode Vcom to the reference low voltage VL. The voltage at the common electrode Vcom is substantially equal to the data voltage at the pixel circuit 130. In this way, image residues generated based on the voltage difference between the voltage of the common electrode Vcom and the data voltage can be eliminated.

In some embodiments, the discharge control switches S1, S2 and the display panel 100 may be disposed on the same substrate. In some embodiments, the discharge control switches S1, S2 and the discharge control circuit 200 may be disposed on the same substrate. In some embodiments, the discharge control switches S1, S2, the discharge control circuit 200 and the display panel 100 may be disposed on the same substrate.

FIG2 is a schematic diagram of a discharge control circuit and a discharge control switch of an embodiment of the present invention. Please refer to FIG1 and FIG2 simultaneously. In this embodiment, the discharge control circuit 200 of the display device 10 includes a sensor 210, a logic circuit 220, and switch control circuits 230 and 240. The switch control circuit 230 includes switches S3, S4, and S5. The switch control circuit 240 includes switches S6 and S7. The logic circuit 220 is coupled to the sensor 210. The switch control circuit 230 is coupled to the logic circuit 220, the second end of the discharge control switch S1, and the control end of the discharge control switch S1. The switch control circuit 240 is coupled to the logic circuit 220, the second end of the discharge control switch S2, and the control end of the discharge control switch S2.

In the present embodiment, a first end of the switch S3 is coupled to a control end of the discharge control switch S1. A second end of the switch S3 is coupled to a reference high voltage VH. A control end of the switch S3 is coupled to a logic circuit 220. A first end of the switch S4 is coupled to a control end of the discharge control switch S1. A second end of the switch S4 is coupled to a reference low voltage VL. A control end of the switch S4 is coupled to the logic circuit 220. A first end of the switch S5 is coupled to a second end of the discharge control switch S1. A second end of the switch S5 is coupled to a reference high voltage VH. A control end of the switch S5 is coupled to the logic circuit 220.

In this embodiment, a first end of the switch S6 is coupled to a control end of the discharge control switch S2. A second end of the switch S6 is coupled to a reference high voltage VH. A control end of the switch S6 is coupled to the logic circuit 220. A first end of the switch S7 is coupled to a second end of the discharge control switch S2. A second end of the switch S7 is coupled to a reference low voltage VL. A control end of the switch S7 is coupled to the logic circuit 220.

In this embodiment, the sensor 210 senses at least one of the working voltage VDD and the reset voltage VR to generate a sensing signal SEN. Specifically, when the sensor 210 determines that the voltage value of at least one of the working voltage VDD and the reset voltage VR is lower than the voltage value of the threshold voltage Vth, the sensor 210 provides the sensing signal SEN with a first voltage level to the logic circuit 220 to notify the logic circuit 220 that the current display device 10 is experiencing an abnormal power failure. On the contrary, when the working voltage VDD and the reset voltage VR are both normal, the sensor 210 provides the sensing signal SEN with a second voltage level to the logic circuit 220. For example, the sensor 210 includes resistors R1, R2 and a comparator CP. The comparator CP can be implemented by an operational amplifier (OPA). The comparator CP has a first input terminal, a second input terminal and an output terminal. The first end of the resistor R1 receives one of the operating voltage VDD and the reset voltage VR. The second end of the resistor R1 is coupled to the first input terminal of the comparator CP. The first end of the resistor R2 is coupled to the first input terminal of the comparator CP. The second end of the resistor R2 is coupled to a system low voltage, such as a ground terminal. The first input terminal of the comparator CP receives a voltage division value of at least one of the operating voltage VDD and the reset voltage VR. The second input terminal of the comparator CP receives a threshold voltage Vth. In this embodiment, when the voltage division value is lower than the voltage value of the threshold voltage Vth, the comparator CP outputs a sensing signal SEN having a low voltage level (i.e., the first voltage level) to the logic circuit 220 through the output terminal; conversely, when the voltage division value is higher than or equal to the voltage value of the threshold voltage Vth, the comparator CP outputs a sensing signal SEN having a high voltage level (i.e., the second voltage level) to the logic circuit 220 through the output terminal.

The logic circuit 220 generates switch control signals CON1 and CON2 according to the sensing signal SEN. The logic circuit 220 provides the switch control signal CON1 to the switch control circuit 230, and provides the switch control signal CON2 to the switch control circuit 240. Specifically, when the operating voltage VDD and the reset voltage VR are both normal, the logic circuit 220 provides the switch control signals CON1 and CON2 according to the sensing signal SEN having the second voltage level. The switch control circuit 230 turns on the switch S4 in response to the switch control signal CON1, and turns off the switches S3 and S5. In addition, the switch control circuit 240 turns off the switches S6 and S7 in response to the switch control signal CON2. Therefore, the discharge control switches S1 and S2 are turned off.

On the contrary, when at least one of the working voltage VDD and the reset voltage VR is abnormal, the logic circuit 220 provides the switch control signals CON1 and CON2 respectively according to the sensing signal SEN having the first voltage level. The switch control circuit 230 turns on the discharge control switch S1 in response to the switch control signal CON1, and connects the second end of the discharge control switch S1 to the reference high voltage VH. Specifically, the switch control circuit 230 turns on the switches S3 and S5 in response to the switch control signal CON1, and turns off the switch S4 to connect the second end of the discharge control switch S1 to the reference high voltage VH. The discharge control switch S1 connects the scan lines 110-1 to 110-m to the reference high voltage VH. Accordingly, all pixel circuits 130 are selected. The switch control circuit 240 reacts to the switch control signal CON2 to turn on the discharge control switch S2, and connects the second end of the discharge control switch S2 to the reference low voltage VL. Specifically, the switch control circuit 240 reacts to the switch control signal CON2 to turn on switches S6 and S7 to connect the second end of the discharge control switch S2 to the reference low voltage VL. The discharge control switch S2 connects the data lines 120-1~120-n and the common electrode Vcom of the display panel 100 to the reference low voltage VL. Accordingly, the data voltages of all pixel circuits 130 are discharged.

In this way, when the sensor 210 determines that an abnormal power failure occurs in the display panel 100 (i.e., the voltage value of at least one of the operating voltage VDD and the reset voltage VR is lower than the voltage value of the threshold voltage Vth), the switch control circuits 230 and 240 respectively turn on the discharge control switches S1 and S2 to perform a discharge operation on all pixel circuits 130 to reduce problems such as image residue or liquid crystal polarization of the display panel 100.

In some embodiments, the resistors R1 and R2 can be ignored in the sensor 210. Therefore, the first input terminal of the comparator CP receives at least one of the working voltage VDD and the reset voltage VR. The second input terminal of the comparator CP receives the threshold voltage Vth. In this embodiment, when at least one of the operating voltage VDD and the reset voltage VR is lower than the voltage value of the threshold voltage Vth, the comparator CP outputs a sensing signal SEN having a low voltage level (i.e., a first voltage level) to the logic circuit 220; conversely, when the voltage value at the first input terminal is higher than or equal to the voltage value of the threshold voltage Vth, the comparator CP outputs a sensing signal SEN having a high voltage level (i.e., a second voltage level) to the logic circuit 220.

In this embodiment, the discharge control switches S1, S2 and the switches S3-S7 can be implemented by at least one transistor or a transmission gate. In this embodiment, the logic circuit 220 is, for example, a central processing unit (CPU), or other programmable general-purpose or special-purpose microprocessors (Microprocessors), digital signal processors (Digital Signal Processors, DSPs), programmable controllers, application-specific integrated circuits (Application Specific Integrated Circuits, ASICs), programmable logic devices (Programmable Logic Devices, PLDs) or other similar devices or combinations of these devices, which can load and execute computer programs.

FIG3A shows a discharge timing diagram of an abnormal working voltage of an embodiment of the present invention. Please refer to FIG1 and FIG3A at the same time. First, at time point t0, the discharge control circuit 200 determines that the voltage value of the working voltage VDD is lower than the voltage value of the threshold voltage Vth. The working voltage VDD is judged to be abnormal. Therefore, the discharge control circuit 200 turns on the discharge control switches S1 and S2. The discharge control circuit 200 connects the second end of the discharge control switch S1 to the reference high voltage VH and connects the second end of the discharge control switch S2 to the reference low voltage VL. At time point t1, the discharge control switch S1 charges the voltage Vs of the scan lines 110-1~110-m to the reference high voltage VH, and the discharge control switch S2 discharges the voltage Vd of the data lines 120-1~120-n and the voltage Vn of the common electrode Vcom of the display panel 100 to the reference low voltage VL. All pixel circuits 130 are selected, which causes all data voltages Vdata located in the pixel circuits 130 to be discharged. At time point t2, all data voltages Vdata located in the pixel circuits 130 are discharged to the reference low voltage VL. It is worth mentioning that the data voltage Vdata includes a residual voltage that is not normally discharged when an abnormal power failure occurs in the display device 10. In addition, in one embodiment, the time difference between time point t0, time point t1 and time point t2 can be ignored.

FIG3B shows a discharge timing diagram of an abnormal reset voltage of an embodiment of the present invention. Please refer to FIG1 and FIG3B at the same time. First, at time point t3, the discharge control circuit 200 determines that the voltage value of the reset voltage VR is lower than the voltage value of the threshold voltage Vth. The reset voltage VR is judged to be abnormal. Therefore, the discharge control circuit 200 turns on the discharge control switches S1 and S2. The discharge control circuit 200 connects the second end of the discharge control switch S1 to the reference high voltage VH, and connects the second end of the discharge control switch S2 to the reference low voltage VL. At time point t4, the discharge control switch S1 charges the voltage Vs of the scan lines 110-1~110-m to the reference high voltage VH, and the discharge control switch S2 discharges the voltage Vd of the data lines 120-1~120-n and the voltage Vn of the common electrode Vcom of the display panel 100 to the reference low voltage VL. All pixel circuits 130 are selected, which causes all data voltages Vdata located in the pixel circuits 130 to be discharged. At time point t5, all data voltages Vdata located in the pixel circuits 130 are discharged to the reference low voltage VL. It is worth mentioning that the data voltage Vdata includes a residual voltage that is not normally discharged when an abnormal power failure occurs in the display device 10. In addition, in one embodiment, the time difference between time point t3, time point t4 and time point t5 can be ignored.

It is worth mentioning that in one embodiment, when both the working voltage VDD and the reset voltage VR of the display device 10 are abnormal, the discharge control circuit 200 performs a discharge operation on the pixel circuit 130. For details on the implementation of the discharge control circuit 200 performing the discharge operation, reference may be made to the multiple embodiments of FIG. 1 to FIG. 3B .

FIG4 is a flow chart of a discharge method of a display device according to an embodiment of the present invention. The discharge method of the present embodiment can be executed by the display device 10 of FIG1 . Please refer to FIG1 and FIG4 at the same time. First, in step S410, the discharge control circuit 200 receives at least one of the operating voltage VDD and the reset voltage VR of the display device 10. Next, in step S420, the discharge control circuit 200 determines whether at least one of the operating voltage VDD and the reset voltage VR is abnormal. When both the operating voltage VDD and the reset voltage VR are normal, return to step S410. On the contrary, when at least one of the operating voltage VDD and the reset voltage VR is abnormal, enter step S430. In step S430, the discharge control circuit 200 turns on the discharge control switches S1 and S2. Finally, in step S440, the discharge control circuit 200 discharges the data voltages in all pixel circuits 130 through the discharge control switches S1 and S2. The implementation details of steps S410 to S440 have been clearly described in the multiple embodiments of FIG. 1 to FIG. 3B, and therefore will not be repeated here.

In summary, the display device and the discharge method provided by the present invention can perform a discharge operation on all pixel circuits by turning on the switch through the discharge control circuit when at least one of the working voltage and the reset voltage of the display device is abnormal. In this way, problems such as image residue or liquid crystal polarization of the display panel can be reduced.

Although the present invention has been disclosed as above by the embodiments, they are not intended to limit the present invention. Any person with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be defined by the scope of the attached patent application.

10: Display device

100: Display panel

110-1, 110-2, 110-3, 110-m: Scanning lines

120-1, 120-2, 120-3, 120-n: data line

130: Pixel circuit

200:Discharge control circuit

210:Sensor

220:Logic Circuit

230, 240: switch control circuit

CP: Comparator

R1, R2: Resistors

S1, S2: discharge control switch

S3, S4, S5, S6, S7: switch

S410, S420, S430, S440: Steps

SEN: Sensing signal

t0, t1, t2, t3, t4, t5: time points

Vcom: Common electrode

VH: Reference high voltage

VL: Reference low voltage

Vd, Vn, Vs: voltage

Vdata: data voltage

VDD: operating voltage

VR: Reset Voltage

Vth: Threshold voltage

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a discharge control circuit and a discharge control switch according to an embodiment of the present invention. FIG. 3A is a discharge timing diagram of an abnormal working voltage according to an embodiment of the present invention. FIG. 3B is a discharge timing diagram of an abnormal reset voltage according to an embodiment of the present invention. FIG. 4 is a flow chart of a discharge method of a display device according to an embodiment of the present invention.

10: Display device

100: Display panel

110-1, 110-2, 110-3, 110-m: scanning line

120-1, 120-2, 120-3, 120-n: data line

130: Pixel circuit

200:Discharge control circuit

S1, S2: discharge control switch

Vcom: common electrode

VDD: operating voltage

VH: Reference high voltage

VL: Reference low voltage

VR: Reset voltage

Claims (10)

A display device includes: a display panel including: a plurality of scan lines; a plurality of data lines; and a plurality of pixel circuits coupled to the plurality of scan lines and the plurality of data lines; a first discharge control switch, wherein a first end of the first discharge control switch is coupled to the plurality of scan lines; a second discharge control switch, wherein a first end of the second discharge control switch is coupled to the plurality of data lines; and a discharge control circuit coupled to the second end of the first discharge control switch, a control end of the first discharge control switch, a second end of the second discharge control switch, and a control end of the second discharge control switch, wherein the discharge control circuit includes the first discharge control switch The first discharge control switch control circuit comprises a switch, wherein the first end of the switch is coupled to the second end of the second discharge control switch, wherein the second end of the switch is coupled to a reference low voltage, wherein when at least one of the operating voltage and the reset voltage of the display device is abnormal, the switch is turned on to connect the second end of the second discharge control switch to the reference low voltage, and the data voltage located in the plurality of pixel circuits is discharged through the first discharge control switch and the second discharge control switch, wherein when the operating voltage and the reset voltage are normal, the switch is disconnected. A display device as described in claim 1, wherein when at least one of the operating voltage and the reset voltage is abnormal, the discharge control circuit turns on the first discharge control switch and the second discharge control switch. A display device as described in claim 1, wherein when at least one of the operating voltage and the reset voltage is abnormal, the discharge control circuit connects the second end of the first discharge control switch to a reference high voltage. A display device as described in claim 3, wherein when at least one of the operating voltage and the reset voltage is abnormal, the first discharge control switch connects the multiple scanning lines to the reference high voltage. A display device as described in claim 1, wherein when at least one of the operating voltage and the reset voltage is abnormal, the second discharge control switch connects the common electrode of the plurality of data lines and the display panel to the reference low voltage. A display device as described in claim 1, wherein when at least one of the working voltage and the reset voltage is abnormal, the voltage value of at least one of the working voltage and the reset voltage is lower than the voltage value of the threshold voltage. The display device as described in claim 1, wherein the discharge control circuit further comprises: a sensor configured to sense at least one of the working voltage and the reset voltage to generate a sensing signal; a logic circuit coupled to the sensor, configured to generate a first discharge control switch control signal and a second discharge control switch control signal according to the sensing signal; and a second discharge control switch control circuit coupled to the logic circuit, the second end of the first discharge control switch and the control end of the first discharge control switch, wherein the first discharge control switch control circuit is also coupled to the logic circuit and the control end of the second discharge control switch. A display device as described in claim 7, wherein when it is determined that the voltage value of at least one of the working voltage and the reset voltage is lower than the voltage value of the threshold voltage, the sensor provides the sensing signal having a first voltage level. A display device as described in claim 8, wherein: the logic circuit provides the first discharge control switch control signal and the second discharge control switch control signal according to the sensing signal having the first voltage level, the second discharge control switch control circuit responds to the first discharge control switch control signal to turn on the first discharge control switch and connect the second end of the first discharge control switch to a reference high voltage, and the first discharge control switch control circuit responds to the second discharge control switch control signal to turn on the second discharge control switch and connect the second end of the second discharge control switch to the reference low voltage. A discharge method for a display device, wherein the display device comprises a display panel, a first discharge control switch, a second discharge control switch and a discharge control circuit, wherein the display panel comprises a plurality of scan lines, a plurality of data lines and a plurality of pixel circuits, wherein a first end of the first discharge control switch is coupled to the plurality of scan lines, wherein a first end of the second discharge control switch is coupled to the plurality of data lines, wherein the discharge control circuit comprises a switch, wherein a first end of the switch is coupled to a second end of the second discharge control switch, wherein a second end of the switch is coupled to a reference low voltage, and the discharge method comprises: receiving a at least one of the working voltage and the reset voltage of the display device; judging whether at least one of the working voltage and the reset voltage is abnormal; when at least one of the working voltage and the reset voltage is abnormal, turning on the first discharge control switch and the second discharge control switch, and turning on the switch to connect the second end of the second discharge control switch to the reference low voltage; discharging the data voltage in the plurality of pixel circuits through the first discharge control switch and the second discharge control switch; and when the working voltage and the reset voltage are normal, turning off the switch.

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