TW202127697A - Led pixel cell, led display device and brightness adjustment method thereof - Google Patents

Abstract

An LED pixel cell includes an LED pixel circuit, a switch circuit, and a charge and discharge regulation circuit. The switch circuit is coupled between the LED pixel circuit and a power source voltage. The charge and discharge regulation circuit is coupled to the switch circuit to control the switch circuit to be turned on and off. The switch circuit is turned on by charging the charge and discharge regulation circuit so as to apply the power source voltage to the LED pixel circuit to start emitting light, and the switch circuit is turned off by discharging the charge and discharge regulation circuit so as to cause the LED pixel circuit to stop emitting light.

Description

Light-emitting diode pixel display unit, light-emitting diode display device and brightness adjustment method thereof

The present invention relates to the technical field of light-emitting diode display, in particular to a light-emitting diode pixel display unit with brightness adjustment, a light-emitting diode display device and a brightness adjustment method thereof.

Due to the rapid advancement of semiconductor devices and display technology, display devices have gradually emerged such as Active Matrix Organic Light Emitting Diode (AMOLED), Micro-LED and Mini-LED (Mini-LED) and other light-emitting diode display devices, because the light-emitting diode display device has self-illumination, good image quality, no viewing angle limitation, high response speed, power saving, DC drive, and operating temperature range Because of the advantages of large size and light weight, its characteristics can meet the requirements of current display devices. Therefore, light-emitting diode display devices have great development potential and are expected to gradually replace Liquid Crystal Display (LCD). The mainstream of flat-panel displays.

Due to the different lighting principles, the dimming method of the LED display device is also different from that of the liquid crystal display device. The brightness of the LED display device is adjusted by lengthening or shortening the lighting time of the LED. Figure 1 shows the dimming method of a conventional light-emitting diode display device, which uses a pulse generator (Pulse Generator) to generate a switch signal (SW), and the switch signal (SW) is used to turn on or off Turning on a switch determines whether the power is turned on or off. It also determines whether all the light-emitting diodes of the light-emitting diode display panel emit light. Therefore, it is assumed that it is a light-emitting diode display panel with a resolution of 1024x1024. The dimming method of the polar body display device can only change the brightness and darkness of 1024x1024 light-emitting diodes at the same time, and it is impossible to fine-tune the brightness and darkness of each light-emitting diode unit individually.

And due to the manufacturing process, LED display panels often have uneven brightness. However, the dimming method of the aforementioned conventional LED display devices can only change the brightness of the entire LED display panel at the same time. Therefore, it is impossible to adjust the brightness of the light-emitting diode pixels (Pixel) individually, which causes the brightness performance of the light-emitting diode display device to often not meet expectations.

Therefore, there are still many shortcomings in the design of the brightness adjustment of the conventional light-emitting diode display device, and it is necessary to improve it.

The purpose of the present invention is mainly to provide a light-emitting diode pixel display unit and a brightness adjustment method thereof. The brightness adjustment circuit is provided in the light-emitting diode pixel display unit to solve the deficiencies of the conventional technology.

According to one feature of the present invention, a light-emitting diode pixel display unit with brightness adjustment is provided, which includes: a light-emitting diode pixel circuit having a light-emitting diode which is driven to emit light; Connected between the light-emitting diode pixel circuit and a power supply voltage; and a charge and discharge control circuit, coupled to the switch circuit to control the on and off of the switch circuit, wherein the charge and discharge control circuit is charged The switch circuit is turned on to apply the power supply voltage to the LED pixel circuit to emit light, and the switch circuit is turned off by discharging the charge and discharge control circuit, causing the LED pixel circuit to stop emitting light.

According to another feature of the present invention, a brightness adjustment method is provided to adjust the emission brightness of the LED pixel display unit. The brightness adjustment method includes: during a first precharge period, the switch circuit is turned off, and the The charge and discharge control circuit causes the output disable signal to the switch circuit; during a second precharge period, the switch circuit is turned off, and the charge and discharge control circuit is charged, so that the enable signal is output to the switch circuit; During the period, the switch circuit is turned on, so that the power supply voltage is applied to the light-emitting diode pixel circuit, and the charge-discharge degree control circuit is discharged; and during a light emission stop period, the charge-discharge control circuit is discharged, causing the output disable signal to The switch circuit.

According to another feature of the present invention, a light-emitting diode display device is provided, which includes a plurality of light-emitting diode pixel display units arranged in a matrix array, wherein at least one light-emitting diode pixel display unit includes: a light-emitting diode The volume pixel circuit has a light emitting diode which is driven to emit light; a switch circuit coupled between the light emitting diode pixel circuit and a power supply voltage; and a charge and discharge control circuit coupled to the switch The circuit controls the on and off of the switch circuit, wherein the switch circuit is turned on by charging the charge and discharge control circuit to apply the power supply voltage to the light emitting diode pixel circuit to emit light, and by making the charge and discharge The control circuit discharges and disconnects the switch circuit, causing the LED pixel circuit to stop emitting light.

The above summary and the following detailed description are exemplary in nature, and are intended to further illustrate the scope of the patent application of the present invention. Other objectives and advantages of the present invention will be described in the following description and drawings.

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the implementation of the present invention and are not used to limit the present invention. In the circuit diagrams of the present invention, based on the expression habits of the circuit, the same circuit symbol can represent one end of the circuit. Or the signal on this end point. For example, the circuit symbol VDD can represent the power supply voltage end point of the circuit or the power supply voltage signal.

FIG. 2 is a block diagram of a light-emitting diode pixel display unit of the present invention. The light-emitting diode pixel display unit includes a light-emitting diode pixel circuit 10, a switch circuit 20, and a charge and discharge control circuit 30. As shown in the figure, the switch circuit 20 is coupled between the light emitting diode pixel circuit 10 and a power supply voltage (VDD), and is controlled by the charge and discharge control circuit 30 to selectively apply the power supply voltage (VDD) to the light emitting diode. The polar pixel circuit 10 makes the light-emitting diode pixel circuit 10 emit light or not, so as to achieve brightness adjustment.

Please also refer to FIG. 3 for a circuit diagram of an embodiment of the light-emitting diode pixel display unit of the present invention. As shown in the figure, the light-emitting diode pixel circuit 10 has a light-emitting diode 14 which can be driven to emit light. And the light-emitting diode pixel circuit 10 of this embodiment is a 2T1C circuit structure, that is, the light-emitting diode pixel circuit 10 includes two transistors 11, 12 and a capacitor 13, wherein one of the transistors 11 The connecting end is connected to the anode of the light emitting diode 14, the other connecting end is connected to one end of the capacitor 13 and used to receive the applied power supply voltage VDD, the cathode of the light emitting diode 14 is grounded, and the other end of the capacitor 13 is connected to the control of the transistor 11 Terminal and a connection terminal of the transistor 12, the other connection terminal and the control terminal of the transistor 12 are respectively connected to the data voltage terminal (data) and the scan signal terminal (SCAN) to drive the light emitting diode according to the scan signal and the data voltage 14 emits light. Since the driving of the LED pixel circuit 10 is known to those familiar with LED display drivers, its circuit operation will not be described in detail here. In addition, the aforementioned light-emitting diode pixel circuit 10 is not limited to the circuit architecture of 2T1C, and it can also be any suitable driving circuit architecture. For example, the architecture of the light-emitting diode pixel circuit 10 can also be a tri-transistor and A combination of a capacitor (3T1C), a combination of five transistors and two capacitors (5T2C), a combination of six transistors and a capacitor (6T1C), a combination of seven transistors and a capacitor (7T1C), and so on.

As shown in FIG. 2, the aforementioned charge and discharge control circuit 30 is coupled to the switch circuit 20 to control the on and off of the switch circuit 20. The charge and discharge control circuit 30 has a capacitive element (as shown in FIG. 3). The capacitor 31) can be charged and discharged. By charging the charging and discharging control circuit 30, the switch circuit 20 can be controlled to turn on the switch circuit 20, so that the power supply voltage (VDD) is applied to the light emitting diode pixel circuit 10 to emit light, and by using The charge and discharge control circuit 30 discharges and the switch circuit 20 is controlled to turn off the switch circuit 20 to control the LED pixel circuit 10 to stop emitting light.

As shown in FIG. 3, the switching circuit 20 includes two switching transistors 21, 22 connected in series, wherein a connecting end of the switching transistor 21 is connected to the power supply voltage (VDD), and the control end of the switching transistor 21 is coupled to the charge and discharge control circuit 30. , The switching transistor 21 is turned on or off by being controlled, one terminal of the switching transistor 22 is connected to the other terminal of the switching transistor 21, and the other terminal of the switching transistor 22 is connected to the light-emitting diode At the junction of the capacitor 13 of the pixel circuit 10 and the transistor 11, the control terminal of the switch transistor 22 is connected to a light-emitting terminal (EM).

Please continue to refer to FIG. 3, the aforementioned charge and discharge control circuit 30 may include two capacitors 31, 32 and three transistors 33, 34, 35, wherein the control terminal of the transistor 33 is connected to a pulse width modulation terminal (PWM), One terminal of the transistor 33 is connected to a first regulated voltage terminal (SIG1), the other terminal of the transistor 33 is connected to one end of the capacitor 31 (marked as node VG1 in FIG. 3), and the other end of the capacitor 31 is connected to A second regulating voltage terminal (SIG2); the control terminal of the transistor 34 is connected to one end of the capacitor 31 (node VG1), one terminal of the transistor 34 is connected to the power supply voltage (VDD), and the other terminal of the transistor 34 is connected Connected to one end of the capacitor 32 (labeled as node VG2 in FIG. 3) and further connected to the control terminal of the switching transistor 21 of the switching circuit 20, the other end of the capacitor 32 is grounded; the control terminal of the transistor 35 is connected to a reset terminal (Reset), one terminal of the transistor 35 is connected to one terminal of the capacitor 32 (node VG2), and the other terminal of the transistor 35 is connected to a reference voltage terminal (VREF).

With the aforementioned circuit in FIG. 3, the capacitor 31 of the charge and discharge control circuit 30 can be precharged in two stages, so that the charge and discharge control circuit 30 can control the on and off of the switch circuit 20, wherein the charge and discharge control circuit 30 is The capacitor 31 is charged through the first regulating voltage terminal (SIG1), and the capacitor 31 is charged again through the second regulating voltage terminal (SIG2), and then the capacitor 31 of the charging and discharging regulating circuit 30 is discharged through the second regulating voltage terminal (SIG2) .

Furthermore, FIG. 4 shows the brightness adjustment method of the LED pixel display unit of the present invention, which includes a first pre-charging step, a second pre-charging step, a light-emitting step, and a light-emitting stop step. The first pre-charging step is used to turn off the switch circuit 20 and charge the charge and discharge control circuit 30 during a first pre-charge period, so as to output a disable signal to the switch circuit 20. Please also Referring to the control waveform diagram of the light-emitting diode pixel display unit of the present invention shown in FIG. 5 and the circuit connection diagram of the light-emitting diode pixel display unit of the present invention shown in FIG. 6(A) during the first precharge period, as shown in FIG. As shown, during the first precharge period (T1), a disable signal is applied to the light-emitting end (EM) of the switching transistor 22 of the switching circuit 20 to turn off the switching transistor 22, and the PWM of the pulse width modulation end (PWM) is The signal is to turn on the transistor 33, the reset signal at the reset terminal (Reset) is to turn off the transistor 35, and a first regulating voltage V (SIG1) is applied to the first regulating voltage terminal (SIG1) to control the charging and discharging control circuit The capacitor 31 of 30 is charged, so the potential of the node VG1 is V(SIG1) and the transistor 34 is turned on, and the power supply voltage (VDD) charges the capacitor 32 so that the potential of the node VG2 is VDD, causing the output disable signal to the switching transistor 21 The switching transistor 21 is turned off. During this period, since the switching transistors 21 and 22 of the switching circuit 20 are all off, the power supply voltage (VDD) is not applied to the light-emitting diode pixel circuit 10, so the light-emitting diode 14 Does not emit light.

The aforementioned second pre-charging step is used to turn off the switch circuit 20 and charge the charge-discharge control circuit 30 during a second pre-charge period, so that an enable signal is output to the switch circuit 20. Please also refer to Fig. 5 shows the control waveform diagram of the LED pixel display unit of the present invention and Fig. 6(B) shows the circuit connection diagram of the LED pixel display unit of the present invention during the second precharge period, as shown in the figure As shown, during the second pre-charge period (T2), a disable signal (disable) is applied to the light-emitting end (EM) of the switching transistor 22 of the switching circuit 20 to turn off the switching transistor 22, and the pulse width modulation end (PWM) The PWM signal is to turn off the transistor 33, and apply a second regulating voltage V(SIG2) to the second regulating voltage terminal (SIG2) to charge the capacitor 31 of the charging and discharging regulating circuit 30, so the potential of the node VG1 is V( SIG1)+V(SIG2) turns off the transistor 34, and because the reset signal of the reset terminal (Reset) turns on the transistor 35, the potential of the node VG2 is the reference potential VREF of the reference voltage terminal (VREF), Since the reference potential VREF is set to be less than VDD, for example, VREF=VDD-Vth, where Vth is the threshold voltage of the transistor, so that an enable signal is output to the switching transistor 21 to turn on the switching transistor 21. During this period, because The switching transistor 22 of the switching circuit 20 is off, and the power supply voltage (VDD) is not applied to the light-emitting diode pixel circuit 10, so the light-emitting diode 14 does not emit light.

The aforementioned light-emitting step is used to turn on the switch circuit 20 during a light-emitting period, so that the power supply voltage (VDD) is applied to the light-emitting diode pixel circuit 10, and the charge and discharge control circuit 20 is discharged. The control waveform diagram of the light-emitting diode pixel display unit of the invention and the circuit connection diagram of the light-emitting diode pixel display unit of the present invention during the light-emitting period shown in FIG. 6(C), as shown in the figure, during the light-emitting period (T3) , The PWM signal at the pulse width modulation terminal (PWM) turns off the transistor 33, and an enable signal (enable) is applied to the light-emitting terminal (EM) of the switching transistor 22 of the switching circuit 20 to turn on the switching transistor 22 and charge The discharge regulating circuit 30 discharges through the second regulating voltage terminal (SIG2), and the potential of the node VG1 decreases from V(SIG1)+V(SIG2), but is still greater than VDD, and the transistor 34 is still disconnected, and the reset terminal ( The reset signal of Reset) turns off the transistor 35, and the potential of the node VG2 is still the reference potential VREF. During this period, since the switching transistors 21 and 22 of the switching circuit 20 are both turned on, the power supply voltage (VDD) is applied to the light emitting The diode pixel circuit 10 causes the light emitting diode 14 to emit light.

The aforementioned light-emission stop step is used to discharge the charge and discharge control circuit 30 during a light-emission stop period, so as to output a disable signal to the switch circuit 20. Please also refer to the light-emitting diode pixel display unit of the present invention shown in FIG. 5 The control waveform diagram and the circuit connection diagram of the LED pixel display unit of the present invention during the luminescence stop period shown in Fig. 6(D), as shown in the figure, during the luminescence stop period (T4), the pulse width modulation terminal (PWM ) Is to turn off the transistor 33, the reset signal of the reset terminal (Reset) is to turn off the transistor 35, the light-emitting signal of the light-emitting terminal (EM) is to turn on the switching transistor 22, and the charge and discharge control circuit 30 still passes through the first The second regulation voltage terminal (SIG2) is discharged, and the potential of node VG1 has been reduced from V(SIG1)+V(SIG2) to less than VDD and finally to 0V, so the transistor 34 is turned on, causing the potential of node VG2 to become VDD and the output is disabled. A signal can be sent to the switching transistor 21 to turn off the switching transistor 21. During this period, since the switching transistor 21 of the switching circuit 20 is off, the power supply voltage (VDD) is not applied to the LED pixel circuit 10, so it emits light. The diode 14 no longer emits light.

From the above circuit diagram and control waveform diagram of the LED pixel display unit of the present invention, it can be seen that the starting point of the light-emitting diode 14 is when the light-emitting end (EM) of the light-emitting signal is at a low potential (turning on the switching transistor 22), The potential ending at node VG1 is less than VDD. Since VG1 is composed of V(SIG1)+V(SIG2), the light-emitting time of the light-emitting diode 14 can be controlled by adjusting V(SIG1), which can effectively achieve individual The purpose of adjusting the brightness of the light-emitting diode pixel display unit.

FIG. 7 is a schematic diagram of the light-emitting diode display device of the present invention. As shown in the figure, the light-emitting diode display device includes a plurality of light-emitting diode pixel display units 1, wherein a plurality of light-emitting diode pixel display units 1 is arranged in a matrix array and driven by data voltage (data) and scan signal (SCAN) for display, and at least one light-emitting diode pixel display unit 1 is the light-emitting diode of the foregoing embodiment The circuit of the pixel display unit is realized, so in the display of the light emitting diode display device, the brightness of the light emitting diode pixel display unit 1 can be adjusted individually, so that the light emission of the light emitting diode display device is more even, and the display image is improved. quality.

In addition, although the circuit diagrams of the foregoing embodiments of the present invention are implemented using PMOS transistors, the present invention is not limited to this. In other embodiments, NMOS transistors or other types of transistors can also be used. In the disclosure of the present invention, different types of transistors can be used to implement the circuit of the present invention, so the circuit structure thereof will not be described in detail. Furthermore, the circuit structure of the charge-discharge control circuit 30 described above is only used to illustrate a specific embodiment, and is not used to limit the implementation of the charge-discharge control circuit 30 of the present invention.

The above-mentioned embodiments are merely examples for the convenience of description, and the scope of rights claimed in the present invention should be subject to the scope of the patent application, rather than being limited to the above-mentioned embodiments.

10: LED pixel circuit 11, 12: Transistor 13: Capacitance 14: Light-emitting diode 20: Switching circuit 21, 22: switching transistor 30: charge and discharge control circuit 31, 32: Capacitance 33, 34, 35: Transistor 1: LED pixel display unit

Figure 1 shows the dimming method of the conventional LED display. FIG. 2 shows a block diagram of the LED pixel display unit of the present invention. FIG. 3 shows a circuit diagram of an embodiment of the LED pixel display unit of the present invention. FIG. 4 shows the brightness adjustment method of the LED pixel display unit of the present invention. FIG. 5 shows a control waveform diagram of the LED pixel display unit of the present invention. FIG. 6(A) shows a circuit connection diagram of the LED pixel display unit of the present invention during the first precharging period. FIG. 6(B) shows a circuit connection diagram of the LED pixel display unit of the present invention during the second precharging period. FIG. 6(C) shows the wiring connection diagram of the light-emitting diode pixel display unit of the present invention during the light-emitting period. FIG. 6(D) shows the wiring diagram of the LED pixel display unit of the present invention during the light-emission stop period. FIG. 7 shows a schematic diagram of the light-emitting diode display device of the present invention.

10: LED pixel circuit

11, 12: Transistor

13: Capacitance

14: Light-emitting diode

20: Switching circuit

21, 22: switching transistor

30: charge and discharge control circuit

31, 32: Capacitance

33, 34, 35: Transistor

Claims (16)

A light-emitting diode pixel display unit, comprising: A light-emitting diode pixel circuit with a light-emitting diode, which is driven to emit light; A switch circuit coupled between the light-emitting diode pixel circuit and a power supply voltage; and A charge and discharge control circuit coupled to the switch circuit to control the on and off of the switch circuit, wherein the switch circuit is turned on by charging the charge and discharge control circuit to apply the power supply voltage to the light emitting diode The pixel circuit emits light, and the switch circuit is turned off by discharging the charge and discharge control circuit to control the light emitting diode pixel circuit to stop emitting light. According to the light-emitting diode pixel display unit described in claim 1, wherein the charge and discharge control circuit has a first control voltage terminal and a second control voltage terminal, and the first control voltage terminal and the second control voltage terminal The control voltage terminal charges the charge-discharge control circuit, and discharges the charge-discharge control circuit through the second control voltage terminal. According to the light-emitting diode pixel display unit described in claim 2, wherein the switch circuit includes a first switch transistor and a second switch transistor connected in series, and the first switch transistor is coupled to The charge and discharge control circuit is controlled to be turned on or off. The light-emitting diode pixel display unit described in item 3 of the scope of patent application, wherein, during a first charging period, the switch circuit is turned off, and the charging and discharging control circuit is charged, so that the disable signal is output to the Switch circuit; in a second charging period, the switch circuit is off, and the charge and discharge control circuit is charged, causing the output enable signal to the switch circuit; in a light emitting period, the switch circuit is turned on, causing the power supply A voltage is applied to the light-emitting diode pixel circuit, and the charge-discharge control circuit discharges; during a light-emission stop period, the charge-discharge control circuit discharges, so that a disable signal is output to the switch circuit. The light-emitting diode pixel display unit according to claim 4, wherein, during the first charging period, a disable signal is applied to the second switching transistor to turn off the second switching transistor, and applying A first regulating voltage is applied to the first regulating voltage terminal to charge the charging and discharging regulating circuit, so as to output a disable signal to the first switching transistor to turn off the first switching transistor. The light-emitting diode pixel display unit described in claim 4, wherein, during the second charging period, a disable signal is applied to the second switching transistor to turn off the second switching transistor, and applying A second regulating voltage is applied to the second regulating voltage terminal to charge the brightness charging and discharging regulating circuit, so as to output an enabling signal to the first switching transistor to turn on the first switching transistor. The light-emitting diode pixel display unit described in claim 4, wherein, during the light-emitting period, an enabling signal is applied to the second switching transistor to turn on the second switching transistor, so that the power supply voltage is applied to The light-emitting diode pixel circuit makes the light-emitting diode emit light, and the charge-discharge control circuit discharges through the second control voltage terminal. The light-emitting diode pixel display unit described in claim 4, wherein, during the light-emission stop period, the charge-discharge control circuit discharges through the second control voltage terminal, so that a disable signal is output to the first switch The transistor turns off the first switching transistor. According to the light-emitting diode pixel display unit described in item 4 of the scope of patent application, the charge and discharge control circuit includes: A first capacitor having a first terminal and a second terminal, the second terminal of the first capacitor is connected to the second regulating voltage terminal; and A second capacitor has a first terminal and a second terminal. The first terminal of the second capacitor is connected to the first switching transistor, and the second terminal of the second capacitor is grounded. According to the light-emitting diode pixel display unit described in item 9 of the scope of patent application, the charge-discharge control circuit further includes: A first transistor having a control terminal, a connection terminal connected to the first regulating voltage terminal, and another connection terminal connected to the first terminal of the first capacitor; A second transistor having a control terminal connected to the first terminal of the first capacitor, a connection terminal connected to the power supply voltage, and another connection terminal connected to the first terminal of the second capacitor; and A third transistor has a control terminal, a connection terminal is connected to the first terminal of the second capacitor, and the other connection terminal is connected to a reference voltage. The light-emitting diode pixel display unit described in claim 10, wherein the control terminal of the first transistor applies a pulse width modulation signal, and the control terminal of the third transistor applies a reset signal . A brightness adjustment method for adjusting the light-emitting brightness of the light-emitting diode pixel display unit as described in item 1 of the scope of patent application, including: During a first pre-charging period, the switch circuit is turned off, and the charge and discharge control circuit is charged, so that the disable signal is output to the switch circuit; During a second pre-charging period, the switch circuit is turned off, and the charge and discharge control circuit is charged, so that an enable signal is output to the switch circuit; During a light-emitting period, the switch circuit is turned on, so that the power supply voltage is applied to the light-emitting diode pixel circuit, and the charge-discharge degree control circuit is discharged; and During a light-emitting stop period, the charge and discharge control circuit is discharged, so that a disable signal is output to the switch circuit. A light-emitting diode display device includes a plurality of light-emitting diode pixel display units arranged in a matrix array, wherein at least one light-emitting diode pixel display unit includes: A light-emitting diode pixel circuit with a light-emitting diode, which is driven to emit light; A switch circuit coupled between the light-emitting diode pixel circuit and a power supply voltage; and A charge and discharge control circuit coupled to the switch circuit to control the on and off of the switch circuit, wherein the switch circuit is turned on by charging the charge and discharge control circuit to apply the power supply voltage to the light emitting diode The pixel circuit emits light, and the switch circuit is turned off by discharging the charge and discharge control circuit to control the light emitting diode pixel circuit to stop emitting light. According to the light-emitting diode display device described in claim 13, wherein the charge and discharge control circuit has a first control voltage terminal and a second control voltage terminal, through which the first control voltage terminal and the second control voltage terminal The voltage terminal charges the charge and discharge control circuit, and discharges the charge and discharge control circuit through the second control voltage terminal. According to the light emitting diode display device described in claim 14, wherein the switch circuit includes a first switch transistor and a second switch transistor connected in series, and the first switch transistor is coupled to the The charge and discharge control circuit is turned on or off under control. According to the light-emitting diode display device described in item 15 of the scope of patent application, in a first charging period, the switch circuit is turned off, and the charge and discharge control circuit is charged, so that the disable signal is output to the switch Circuit; in a second charging period, the switch circuit is off, and the charge and discharge control circuit is charged, causing the output enable signal to the switch circuit; in a light-emitting period, the switch circuit is turned on, causing the power supply voltage It is applied to the light-emitting diode pixel circuit, and the charge-discharge control circuit discharges; during a light-emission stop period, the charge-discharge control circuit discharges, causing the output disable signal to the switch circuit.

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