Display device and electronic device

Abstract

The embodiments of the present disclosure provide a display device and an electronic device. A pixel driver circuit of the display device comprises: a memory cell, a voltage dividing unit, a first switch unit, a second switch unit, a third switch unit, and a driver unit; the memory unit, by means of a potential thereof, compensates for a threshold voltage of the driver unit during a light-emission stage; the first switch unit turns on the driver unit during an initialization stage so that the driver unit discharges a charge by means of the second switch unit; and during a compensation stage and the light-emission stage, the potential of the memory cell is equal to the threshold voltage of the driver unit. The pixel driver circuit of the display device uses a relatively small number of elements and occupies a small area, which is beneficial for achieving high resolution. In addition, using the potential of the memory cell to compensate for the threshold voltage of the driver unit during the light-emission stage can compensate for brightness deviation caused by threshold voltage drift. Moreover, the charges of the driver unit and the memory cell can be discharged in advance during the initialization stage, ensuring write voltage stability.

Description

Display device and electronic device

[0001] The present application claims priority to the Chinese patent application No. 202410866106.3, filed on June 28, 2024, and entitled "Display device and electronic device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of display, in particular to a display device and an electronic device. BACKGROUND

[0003] In order to make the same area of display screen display more rich details, the pixel needs to be as small as possible, so that as many pixels as possible can be arranged on the same area of display screen. The size of the pixel driving circuit affects the size of the pixel, so reducing the size of the pixel driving circuit becomes the key to realize high resolution. In addition, the threshold voltage drift of the driving tube will cause the brightness deviation problem, which affects the display effect. Therefore, providing a scheme capable of reducing the number of components while improving the display effect has become a technical problem to be solved by those skilled in the art. SUMMARY

[0004] The purpose of the present application is to provide a display device and an electronic device, the number of components used by the pixel driving circuit of the display device is less, and the threshold voltage of the driving unit is compensated by the potential of the storage unit in the light-emitting stage, which can compensate the brightness deviation caused by the threshold voltage drift and improve the display effect.

[0005] To solve the above technical problems, the present application provides a display device, which is provided with a pixel driving circuit, and the pixel driving circuit comprises:

[0006] a storage unit, a voltage dividing unit, a first switch unit, a second switch unit, a third switch unit and a driving unit; the storage unit and the voltage dividing unit are connected in series; the first switch unit is connected with the voltage dividing unit, the storage unit and the driving unit respectively, and the driving unit is also connected with the second switch unit, the third switch unit and a light-emitting power supply voltage;

[0007] The voltage dividing unit is used for voltage division.

[0008] The storage unit is used for storing electric charge, and compensating the threshold voltage of the driving unit by the potential of the storage unit in the light-emitting stage.

[0009] The first switch unit is configured to turn on the driving unit in an initialization stage to enable the driving unit to discharge charge through the second switch unit; and to make the potential of the storage unit equal to the threshold voltage of the driving unit in a compensation stage and a light emitting stage.

[0010] The second switch unit is configured to provide a channel for the storage unit and the driving unit to discharge charge.

[0011] The driving unit is configured to output current to the third switch unit in the light emitting stage.

[0012] The third switch unit is configured to output current to the light emitting tube in the light emitting stage.

[0013] In some embodiments, the first switch unit comprises:

[0014] a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; a first end of the first switch tube is connected to a signal voltage, a second end of the first switch tube is connected to a first end of the voltage dividing unit and a first end of the second switch tube, and a third end of the first switch tube is connected to a control signal; a second end of the second switch tube is connected to a third end of the driving unit, and a third end of the second switch tube is connected to the control signal; a first end of the third switch tube is connected to a reference voltage, a second end of the third switch tube is connected to a second end of the voltage dividing unit, a first end of the storage unit and a first end of the fourth switch tube, and a third end of the third switch tube is connected to the control signal; a second end of the fourth switch tube is connected to the third end of the driving unit, and a third end of the fourth switch tube is connected to the control signal.

[0015] In some embodiments, the second switch unit comprises:

[0016] a fifth switch tube; a first end of the fifth switch tube is connected to a second end of the storage unit, a second end of the fifth switch tube is connected to an anode reset voltage, and a third end of the fifth switch tube is connected to the control signal.

[0017] In some embodiments, the third switch unit comprises:

[0018] a sixth switch tube; a first end of the sixth switch tube is connected to the light emitting tube, a second end of the sixth switch tube is connected to the second end of the driving unit, and a third end of the sixth switch tube is connected to the control signal.

[0019] In some embodiments, the third end of the first switch tube and the third end of the fifth switch tube are both connected to a reset control signal; the third end of the second switch tube, the third end of the third switch tube, the third end of the fourth switch tube and the third end of the sixth switch tube are all connected to a dimming control signal.

[0020] In some embodiments, the first switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are NMOS tubes; the first end of the first switch tube, the first end of the third switch tube, the first end of the fourth switch tube and the first end of the fifth switch tube are the drain of the NMOS tube, the second end of the first switch tube, the second end of the third switch tube, the second end of the fourth switch tube and the second end of the fifth switch tube are the source of the NMOS tube, the third end of the first switch tube, the third end of the third switch tube, the third end of the fourth switch tube and the third end of the fifth switch tube are the gate of the NMOS tube; the second switch tube and the sixth switch tube are PMOS tubes; the first end of the second switch tube and the first end of the sixth switch tube are the drain of the PMOS tube, the second end of the second switch tube and the second end of the sixth switch tube are the source of the PMOS tube, the third end of the second switch tube and the third end of the sixth switch tube are the gate of the PMOS tube.

[0021] In some embodiments, the driving unit comprises a seventh switch tube; the first end of the seventh switch tube is the first end of the driving unit, the second end of the seventh switch tube is the second end of the driving unit, and the third end of the seventh switch tube is the third end of the driving unit.

[0022] In some embodiments, the seventh switch tube is an NMOS tube; the first end of the seventh switch tube is the drain of the NMOS tube, the second end of the seventh switch tube is the source of the NMOS tube, and the third end of the seventh switch tube is the gate of the NMOS tube.

[0023] In some embodiments, the voltage dividing unit comprises a first capacitor; the first end of the first capacitor is connected to the second end of the first switch tube and the first end of the second switch tube, and the second end of the first capacitor is connected to the storage unit, the second end of the third switch tube and the first end of the fourth switch tube; the storage unit comprises a second capacitor; the first end of the second capacitor is connected to the voltage dividing unit, and the second end of the second capacitor is connected to the first end of the fifth switch tube, the second end of the sixth switch tube and the second end of the seventh switch tube.

[0024] In some embodiments, the display device is provided with driving.

[0025] To solve the above technical problems, the present application also provides an electronic device comprising the display device as described above.

[0026] The display device provided in the application is provided with a pixel driving circuit, which comprises a storage unit, a voltage dividing unit, a first switch unit, a second switch unit, a third switch unit and a driving unit; the storage unit is connected with the voltage dividing unit in series; the first switch unit is connected with the voltage dividing unit, the storage unit and the driving unit respectively, and the driving unit is also connected with the second switch unit, the third switch unit and a light-emitting power supply voltage; the voltage dividing unit is used for voltage division; the storage unit is used for storing electric charges, and the threshold voltage of the driving unit is compensated by the potential of the storage unit in the light-emitting stage; the first switch unit is used for turning on the driving unit in the initialization stage, so that the driving unit discharges electric charges through the second switch unit; the potential of the storage unit is equal to the threshold voltage of the driving unit in the compensation stage and the light-emitting stage; the second switch unit is used for providing a channel for discharging electric charges for the storage unit and the driving unit; the driving unit is used for outputting current to the third switch unit in the light-emitting stage; and the third switch unit is used for outputting current to a light-emitting tube in the light-emitting stage.

[0027] It can be seen that the pixel driving circuit in the display device provided in the application comprises a storage unit, a voltage dividing unit, a first switch unit, a second switch unit, a third switch unit and a driving unit, the number of elements used is small, the occupied area is small, and high resolution can be realized. In the light-emitting stage, the potential of the storage unit is equal to the threshold voltage of the driving unit, the threshold voltage of the driving unit is compensated by the potential of the storage unit, the brightness deviation caused by threshold voltage drift can be compensated, and the display effect is improved. In the initialization stage, the electric charges of the driving unit and the storage unit can be discharged in advance, so that the stability of the write voltage can be ensured, and the display effect is improved.

[0028] The electronic device provided in the application also has the above technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the prior art and the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] FIG. 1 is a schematic diagram of a pixel driving circuit of a display device provided in an embodiment of the application;

[0031] FIG. 2 is a schematic diagram of a specific pixel driving circuit provided in an embodiment of the application;

[0032] FIG. 3 is a schematic diagram of a specific pixel driving circuit provided in an embodiment of the application;

[0033] Figure 4 is a signal timing diagram provided by an embodiment of the present application. DETAILED DESCRIPTION

[0034] The core of the present application is to provide a display device and an electronic device, the pixel driving circuit of the display device uses a small number of elements, and the threshold voltage of the driving unit is compensated by the potential of the storage unit in the light-emitting stage, so as to compensate the brightness deviation caused by the threshold voltage drift and improve the display effect.

[0035] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Please refer to Figure 1, which is a schematic diagram of a pixel driving circuit of a display device provided by an embodiment of the present application. As shown in Figure 1, the pixel driving circuit comprises:

[0037] a storage unit 20, a voltage dividing unit 10, a first switch unit 30, a second switch unit 40, a third switch unit 50 and a driving unit 60; the storage unit 20 is connected in series with the voltage dividing unit 10; the first switch unit 30 is connected with the voltage dividing unit 10, the storage unit 20 and the driving unit 60 respectively, and the driving unit 60 is further connected with the second switch unit 40, the third switch unit 50 and a light-emitting power supply voltage;

[0038] The voltage dividing unit 10 is configured to divide voltage.

[0039] The storage unit 20 is configured to store electric charge and compensate the threshold voltage of the driving unit 60 by the potential of the storage unit 20 in the light-emitting stage.

[0040] The first switch unit 30 is configured to turn on the driving unit 60 in the initialization stage, so that the driving unit 60 discharges electric charge through the second switch unit 40; and make the potential of the storage unit 20 equal to the threshold voltage of the driving unit 60 in the compensation stage and the light-emitting stage.

[0041] The second switch unit 40 is configured to provide a channel for discharging electric charge for the storage unit 20 and the driving unit 60.

[0042] The driving unit 60 is configured to output current to the third switch unit 50 in the light-emitting stage.

[0043] The third switch unit 50 is configured to output current to the light emitting tube in the light emitting stage.

[0044] The pixel driving circuit in the embodiment mainly comprises a storage unit 20, a voltage dividing unit 10, a first switch unit 30, a second switch unit 40, a third switch unit 50 and a driving unit 60. The voltage dividing unit 10 is configured to divide voltage. The storage unit 20 is configured to store charge. In the light emitting stage, the threshold voltage of the driving unit 60 is compensated by the potential of the storage unit 20, so that the brightness deviation caused by the threshold voltage drift of the driving unit 60 is compensated in the light emitting stage.

[0045] In the initialization stage, the first switch unit 30 is mainly configured to apply a reference voltage to the gate of the driving unit 60, so that the driving unit 60 discharges charge through the second switch unit 40. In the compensation stage and the light emitting stage, the first switch unit 30 is mainly configured to make the potential of the storage unit 20 equal to the threshold voltage of the driving unit 60, so that the threshold voltage of the driving unit 60 is compensated by the potential of the storage unit 20.

[0046] The second switch unit 40 is configured to provide a channel for the storage unit 20 and the driving unit 60 to discharge charge. In the initialization stage, in addition to the charge of the driving unit 60 being discharged through the first switch unit 30, the charge of the storage unit 20 can also be discharged through the first switch unit 30, so as to ensure the stability of the write voltage.

[0047] The driving unit 60 is configured to output current to the third switch unit 50 in the light emitting stage, and then the third switch unit 50 outputs current to the light emitting tube.

[0048] In some embodiments, the first switch unit 30 comprises a first switch tube T1, a second switch tube T2, a third switch tube T3 and a fourth switch tube T4. The first end of the first switch tube T1 is connected to a signal voltage, the second end of the first switch tube T1 is connected to the first end of the voltage dividing unit 10 and the first end of the second switch tube T2, and the third end of the first switch tube T1 is connected to a control signal. The second end of the second switch tube T2 is connected to the third end of the driving unit 60, and the third end of the second switch tube T2 is connected to a control signal. The first end of the third switch tube T3 is connected to a reference voltage, the second end of the third switch tube T3 is connected to the second end of the voltage dividing unit 10, the first end of the storage unit 20 and the first end of the fourth switch tube T4, and the third end of the third switch tube T3 is connected to a control signal. The second end of the fourth switch tube T4 is connected to the third end of the driving unit 60, and the third end of the fourth switch tube T4 is connected to a control signal.

[0049] The second switch unit 40 comprises a fifth switch tube T5; a first end of the fifth switch tube T5 is connected to a second end of the storage unit 20, a second end of the fifth switch tube T5 is connected to an anode reset voltage, and a third end of the fifth switch tube T5 is connected to a control signal.

[0050] The third switch unit 50 comprises a sixth switch tube T6; a first end of the sixth switch tube T6 is connected to a light emitting tube, a second end of the sixth switch tube T6 is connected to a second end of the driving unit 60, and a third end of the sixth switch tube T6 is connected to a control signal.

[0051] The driving unit 60 comprises a seventh switch tube T7; a first end of the seventh switch tube T7 is a first end of the driving unit 60, a second end of the seventh switch tube T7 is a second end of the driving unit 60, and a third end of the seventh switch tube T7 is a third end of the driving unit 60.

[0052] The voltage dividing unit 10 comprises a first capacitor C0; a first end of the first capacitor C0 is connected to a second end of the first switch tube T1 and a first end of the second switch tube T2, and a second end of the first capacitor C0 is connected to the storage unit 20, a second end of the third switch tube T3 and a first end of the fourth switch tube T4.

[0053] The storage unit 20 comprises a second capacitor Cst; a first end of the second capacitor Cst is connected to the voltage dividing unit 10, and a second end of the second capacitor Cst is connected to a first end of the fifth switch tube T5, a second end of the sixth switch tube T6 and a second end of the seventh switch tube T7.

[0054] Referring to FIG. 2, in the embodiment, the pixel driving circuit comprises seven switch tubes and two capacitors, the number of elements of the pixel driving circuit is small, the area occupied by the pixel driving circuit is small, which is conducive to realizing high resolution, and the same area of the display screen can present more details.

[0055] Based on the above circuit structure, the working principle of the pixel driving circuit is as follows:

[0056] In the initialization stage, the signal voltage VDATA and the reference voltage Vref are connected at the same time, the first switch tube T1, the third switch tube T3, the fourth switch tube T4 and the fifth switch tube T5 are turned on, the second switch tube T2 and the sixth switch tube T6 are turned off, the voltage of the lower plate of the first capacitor C0 and the upper plate of the second capacitor Cst, that is, the potential of point A shown in FIG. 2, is the reference voltage, the voltage of the upper plate of the first capacitor C0, that is, the potential of point B shown in FIG. 2, is the signal voltage, so that the voltage difference between the two ends of the first capacitor C0 is VDATA-Vref. At the same time, the voltage of the gate of the seventh switch tube T7 is also the reference voltage, that is, the voltage for controlling the gate of the seventh switch tube T7 to be turned on, so that the seventh switch tube T7 discharges the charge to the fifth switch tube T5. The voltage of the upper plate of the second capacitor Cst is the reference voltage, and the voltage of the lower plate of the second capacitor Cst is the anode reset voltage VAR.

[0057] In the compensation stage, the first switch tube T1, the second switch tube T2, the fifth switch tube T5 and the sixth switch tube T6 are turned off, the third switch tube T3 and the fourth switch tube T4 are turned on, and the upper plate of the first capacitor C0 becomes a floating point, that is, point B shown in FIG. 2 becomes a floating point. The potential of the lower plate of the first capacitor C0, that is, the potential of point A shown in FIG. 2, is still the reference voltage, and the voltage of the gate of the seventh switch tube T7 is still the reference voltage. The voltage difference between the gate and the source of the seventh switch tube T7 is equal to Vref-Vth, that is, the potential stored in the second capacitor Cst is Vth. Vth is the threshold voltage of the first switch tube T1.

[0058] In the light-emitting stage, the first switch tube T1, the third switch tube T3, the fourth switch tube T4 and the fifth switch tube T5 are turned off, and the second switch tube T2 and the sixth switch tube T6 are turned on. At this time, the potentials of the first capacitor C0 and the second capacitor Cst are combined to be VDATA-Vref+Vth, the voltage VG of the gate of the seventh switch tube T7 is VDATA-Vref+Vth, so that the voltage difference between the gate and the source of the seventh switch tube T7 at this time is VDATA-Vref, which eliminates Vth and realizes compensation of the brightness deviation caused by Vth drift in the light-emitting stage.

[0059] In some embodiments, the third end of the first switch tube T1 and the third end of the fifth switch tube T5 are connected to a reset control signal; the third end of the second switch tube T2, the third end of the third switch tube T3, the third end of the fourth switch tube T4 and the third end of the sixth switch tube T6 are connected to a dimming control signal.

[0060] The control signal in the embodiment only includes a dimming control signal and a reset control signal, and there are only two control signal lines, so that fewer control signal logic lines can be used, and the coupling between the lines can be reduced. By using the circuit structure design described in the above embodiment, the number of switch tubes is reduced, and the requirements for the external control circuit unit are more relaxed. In the timing design, the demand for signals of the external control circuit unit (the number of GOA signals is controlled to be small) is reduced, that is, the control requirements for the control signal are more relaxed, and the circuit structure design can be optimized.

[0061] In some embodiments, the first switch tube T1, the third switch tube T3, the fourth switch tube T4, and the fifth switch tube T5 are all NMOS tubes; the first end of the first switch tube T1, the first end of the third switch tube T3, the first end of the fourth switch tube T4, and the first end of the fifth switch tube T5 are the drains of the NMOS tubes, the second end of the first switch tube T1, the second end of the third switch tube T3, the second end of the fourth switch tube T4, and the second end of the fifth switch tube T5 are the sources of the NMOS tubes, and the third end of the first switch tube T1, the third end of the third switch tube T3, the third end of the fourth switch tube T4, and the third end of the fifth switch tube T5 are the gates of the NMOS tubes; the second switch tube T2 and the sixth switch tube T6 are PMOS tubes; the first end of the second switch tube T2 and the first end of the sixth switch tube T6 are the drains of the PMOS tubes, the second end of the second switch tube T2 and the second end of the sixth switch tube T6 are the sources of the PMOS tubes, and the third end of the second switch tube T2 and the third end of the sixth switch tube T6 are the gates of the PMOS tubes. The seventh switch tube T7 is an NMOS tube; the first end of the seventh switch tube T7 is the drain of the NMOS tube, the second end of the seventh switch tube T7 is the source of the NMOS tube, and the third end of the seventh switch tube T7 is the gate of the NMOS tube.

[0062] The pixel driving circuit in the embodiment includes five NMOS tubes, two PMOS tubes, and two capacitors.

[0063] The drain of the first switch tube T1 is connected with a signal voltage VDATA, the source of the first switch tube T1 is connected with the first end of the first capacitor C0, i.e. the upper plate of the first capacitor C0 and the drain of the second switch tube T2, the gate of the first switch tube T1 is connected with a reset control signal. The source of the second switch tube T2 is connected with the gate of the seventh switch tube T7, the gate of the second switch tube T2 is connected with a dimming control signal. The drain of the third switch tube T3 is connected with a reference voltage Vref, the source of the third switch tube T3 is connected with the second end of the first capacitor C0, i.e. the lower plate of the first capacitor C0, the first end of the second capacitor Cst, i.e. the upper plate of the second capacitor Cst and the drain of the fourth switch tube T4, the gate of the third switch tube T3 is connected with the dimming control signal. The source of the fourth switch tube T4 is connected with the gate of the seventh switch tube T7, the gate of the fourth switch tube T4 is connected with the dimming control signal. The drain of the fifth switch tube T5 is connected with the second end of the second capacitor Cst, i.e. the lower plate of the second capacitor Cst, the source of the fifth switch tube T5 is connected with an anode reset voltage, the gate of the fifth switch tube T5 is connected with the reset control signal. The drain of the sixth switch tube T6 is connected with the anode of the light emitting tube, the source of the sixth switch tube T6 is connected with the source of the seventh switch tube T7, the gate of the sixth switch tube T6 is connected with the dimming control signal, the cathode of the light emitting tube is connected with a cathode power supply voltage ELVSS. The light emitting tube can be an OLED device. The drain of the seventh switch tube T7 is connected with a light emitting power supply voltage ELVDD.

[0064] Based on the above circuit structure, in combination with the signal timing diagram shown in FIG. 4, the working principle of the pixel driving circuit is as follows: ① in FIG. 4 represents the initialization stage, ② represents the compensation stage, and ③ represents the light emitting stage.

[0065] When the control signal of the gate of the PMOS tube is high, the PMOS tube is off, and when the control signal of the gate of the PMOS tube is low, the PMOS tube is on. When the control signal of the gate of the NMOS tube is high, the NMOS tube is on, and when the control signal of the gate of the NMOS tube is low, the NMOS tube is off.

[0066] The on-off states of the NMOS tube and the PMOS tube are opposite. By using the current structure design described in the above embodiment, the number of switch tubes is reduced, the requirement for the external control circuit unit is more relaxed, the demand for the signals of the external control circuit unit is reduced in timing design (the number of GOA signals is controlled to be small), that is, the control requirement for the control signal is more relaxed, and the circuit structure can be optimized. As shown in FIG. 4, only two control signal lines are needed to drive the switch tubes in the circuit at the same time, which greatly reduces the number of control signals.

[0067] In the initialization stage, the signal voltage VDATA and the reference voltage Vref are connected at the same time, the reset control signal and the dimming control signal are both high, the first switch tube T1, the third switch tube T3, the fourth switch tube T4 and the fifth switch tube T5 are turned on, the second switch tube T2 and the sixth switch tube T6 are turned off, the voltage of the lower plate of the first capacitor C0 and the upper plate of the second capacitor Cst, that is, the potential of point A shown in FIG. 2, is the reference voltage, the voltage of the upper plate of the first capacitor C0, that is, the potential of point B shown in FIG. 2, is the signal voltage, so that the voltage difference between the two ends of the first capacitor C0 is VDATA-Vref. At the same time, the voltage of the gate of the seventh switch tube T7 is also the reference voltage, that is, the voltage for controlling the gate of the seventh switch tube T7 to be turned on, so that the seventh switch tube T7 discharges the charge to the fifth switch tube T5. The voltage of the upper plate of the second capacitor Cst is the reference voltage, and the voltage of the lower plate of the second capacitor Cst is the anode reset voltage VAR.

[0068] In the compensation stage, the reset control signal becomes low, the dimming control signal remains high, the first switch tube T1, the second switch tube T2, the fifth switch tube T5 and the sixth switch tube T6 are turned off, the third switch tube T3 and the fourth switch tube T4 are turned on, and the upper plate of the first capacitor C0 becomes a floating point, that is, point B shown in FIG. 2 becomes a floating point. The potential of the lower plate of the first capacitor C0, that is, the potential of point A shown in FIG. 2, remains the reference voltage, and the voltage of the gate of the seventh switch tube T7 remains the reference voltage. The voltage difference between the gate and the source of the seventh switch tube T7 is equal to Vref-Vth, that is, the potential stored in the second capacitor Cst is Vth. Vth is the threshold voltage of the first switch tube T1.

[0069] In the light-emitting stage, the reset control signal remains low, the dimming control signal becomes low, the first switch tube T1, the third switch tube T3, the fourth switch tube T4 and the fifth switch tube T5 are turned off, the second switch tube T2 and the sixth switch tube T6 are turned on, at this time, the potentials of the first capacitor C0 and the second capacitor Cst are VDATA-Vref+Vth, the voltage VG of the gate of the seventh switch tube T7 is VDATA-Vref+Vth, therefore, the voltage difference between the gate and the source of the seventh switch tube T7 at this time is VDATA-Vref, which eliminates Vth, and the brightness deviation caused by Vth drift in the light-emitting stage is compensated.

[0070] It can be understood that, in some embodiments, the second switch tube T2 and the sixth switch tube T6 can be NMOS tubes, at this time, a control signal wire can be added, and the second switch tube T2 and the sixth switch tube T6 are controlled by the control signal of the added control signal wire, which achieves the same effect as the second switch tube T2 and the sixth switch tube being PMOS tubes and both being controlled by the dimming control signal.

[0071] In some embodiments, the display device is provided with a drive.

[0072] In the embodiment, the display device is provided with a drive. The drive is configured to output a control signal, such as a dimming control signal or a reset control signal.

[0073] In addition, in some embodiments, the display device can not be provided with a drive. The display device is not provided with a drive, and the drive is independent of the display device and is a different module.

[0074] In summary, the pixel driving circuit in the display device provided in the present application includes a storage unit, a voltage dividing unit, a first switch unit, a second switch unit, a third switch unit, and a driving unit. The number of elements used is small, the area occupied is small, and high resolution can be achieved. In the light-emitting stage, the potential of the storage unit is equal to the threshold voltage of the driving unit. The threshold voltage of the driving unit is compensated by the potential of the storage unit, the brightness deviation caused by the threshold voltage drift can be compensated, and the display effect is improved. In the initialization stage, the charges of the driving unit and the storage unit can be discharged in advance, so that the stability of the write voltage can be ensured, and the display effect is improved.

[0075] The present application also provides an electronic device provided with the display device described in any of the above embodiments. The electronic device can be an AR (Augmented Reality) device, a VR (Virtual Reality) device, an MR (Mixed Reality) device, a watch, or the like. The electronic device provided in the present application can be described with reference to the above embodiments of the display device, and will not be described here.

[0076] Because the situation is complex, it is impossible to enumerate and describe it one by one. Those skilled in the art should be aware that, under the basic principles of the embodiments provided in the present application, there can be many examples in combination with the actual situation, and without sufficient creative labor, they should all be within the scope of the present application.

[0077] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0078] The display device and the electronic device provided in the present application have been described in detail. The principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0079] It also needs to be explained that in the present specification, the relational terms such as first and second and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A display device, wherein the display device is provided with a pixel driving circuit, characterized in that, The pixel driving circuit includes: The system comprises a storage unit, a voltage divider unit, a first switch unit, a second switch unit, a third switch unit, and a drive unit; the storage unit is connected in series with the voltage divider unit; the first switch unit is connected to the voltage divider unit, the storage unit, and the drive unit, and the drive unit is also connected to the second switch unit, the third switch unit, and the light-emitting power supply voltage; The voltage divider unit is used for voltage division; The storage unit is used to store charge, and during the light-emitting phase, the potential of the storage unit compensates for the threshold voltage of the driving unit. The first switching unit is used to turn on the driving unit during the initialization phase, so that the driving unit can discharge charge through the second switching unit; and to make the potential of the storage unit equal to the threshold voltage of the driving unit during the compensation phase and the light emission phase. The second switching unit is used to provide a channel for discharging charge between the storage unit and the driving unit; The driving unit is used to output current to the third switching unit during the light-emitting phase; The third switching unit is used to output current to the light-emitting diode during the light-emitting stage.

2. The display device according to claim 1, characterized in that, The first switching unit includes: A first switch, a second switch, a third switch, and a fourth switch; the first terminal of the first switch is connected to a signal voltage, the second terminal of the first switch is connected to the first terminal of the voltage divider unit and the first terminal of the second switch, and the third terminal of the first switch is connected to a control signal; the second terminal of the second switch is connected to the third terminal of the drive unit, and the third terminal of the second switch is connected to a control signal; the first terminal of the third switch is connected to a reference voltage, the second terminal of the third switch is connected to the second terminal of the voltage divider unit, the first terminal of the storage unit, and the first terminal of the fourth switch, and the third terminal of the third switch is connected to a control signal; the second terminal of the fourth switch is connected to the third terminal of the drive unit, and the third terminal of the fourth switch is connected to a control signal.

3. The display device according to claim 2, characterized in that, The second switching unit includes: The fifth switching transistor; the first terminal of the fifth switching transistor is connected to the second terminal of the storage unit, the second terminal of the fifth switching transistor is connected to the anode reset voltage, and the third terminal of the fifth switching transistor is connected to the control signal.

4. The display device according to claim 3, characterized in that, The third switching unit includes: The sixth switch transistor; the first end of the sixth switch transistor is connected to the light-emitting diode, the second end of the sixth switch transistor is connected to the second end of the driving unit, and the third end of the sixth switch transistor is connected to the control signal.

5. The display device according to claim 4, characterized in that, The third terminal of the first switch and the third terminal of the fifth switch are both connected to a reset control signal; the third terminals of the second switch, the third switch, the fourth switch, and the sixth switch are all connected to a dimming control signal.

6. The display device according to claim 5, characterized in that, The first, third, fourth, and fifth switching transistors are all NMOS transistors; the first terminal of the first, third, fourth, and fifth switching transistors are the drains of the NMOS transistors, the second terminal of the first, third, fourth, and fifth switching transistors are the sources of the NMOS transistors, and the third terminal of the first, third, fourth, and fifth switching transistors are the gates of the NMOS transistors; the second and sixth switching transistors are PMOS transistors; the first terminal of the second and sixth switching transistors are the drains of the PMOS transistors, the second terminal of the second and sixth switching transistors are the sources of the PMOS transistors, and the third terminal of the second and sixth switching transistors are the gates of the PMOS transistors.

7. The display device according to claim 4, characterized in that, The driving unit includes a seventh switch transistor; the first end of the seventh switch transistor is the first end of the driving unit, the second end of the seventh switch transistor is the second end of the driving unit, and the third end of the seventh switch transistor is the third end of the driving unit.

8. The display device according to claim 7, characterized in that, The seventh switch is an NMOS transistor; the first terminal of the seventh switch is the drain of the NMOS transistor, the second terminal of the seventh switch is the source of the NMOS transistor, and the third terminal of the seventh switch is the gate of the NMOS transistor.

9. The display device according to claim 7, characterized in that, The voltage divider unit includes: a first capacitor; a first terminal of the first capacitor is connected to the second terminal of the first switching transistor and the first terminal of the second switching transistor, and the second terminal of the first capacitor is connected to the storage unit, the second terminal of the third switching transistor and the first terminal of the fourth switching transistor; The storage unit includes: a second capacitor; a first end of the second capacitor is connected to the voltage divider unit, and a second end of the second capacitor is connected to the first end of the fifth switch, the second end of the sixth switch, and the second end of the seventh switch.

10. The display device according to claim 1, characterized in that, The display device is equipped with a driver.

11. An electronic device, characterized in that, The electronic device includes the display device as described in any one of claims 1 to 10.

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