Pixel circuit, control method, display equipment, device, control end and medium

Abstract

The invention relates to a pixel circuit, a control method, display equipment, a device, a control end and a medium. The pixel circuit comprises a switching circuit, a driving circuit and a light emitting circuit, the switching circuit can initialize the driving circuit and conduct a path between the driving circuit and the light emitting circuit; the driving circuit can drive the light emitting circuit and compensate for sub-threshold current deviation and voltage fluctuation; the light emitting circuit can emit light under the driving of the driving circuit. The switching circuit, the driving circuit and the light-emitting circuit are combined, efficient driving of the light-emitting unit can be achieved, and the uniformity and brightness of light output are effectively improved. The driving circuit has the compensation function of subthreshold current deviation and voltage fluctuation, the stability of the circuit in different working environments is improved, performance fluctuation caused by external factors is reduced, the reliability of the system is improved by optimizing circuit links, the fault occurrence rate is reduced, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a pixel circuit and control method, a display device, an apparatus, a control terminal and a medium. Background Art

[0002] In modern AMOLED (organic light-emitting diode) display panels, the pixel driver circuit is a key component to achieve high-quality image display. This circuit controls the brightness of the light-emitting device by driving the transistor to display the image. However, current pixel driver circuits often face stability issues caused by leakage current. This leakage current not only affects the signal integrity of the gate of the driving transistor, but also causes the instability of the light-emitting brightness, which seriously affects the display effect and image quality of the AMOLED display panel. Summary of the invention

[0003] Based on this, it is necessary to provide a pixel circuit and control method, display device, apparatus, chip and storage medium that can improve the display effect in response to the above technical problems.

[0004] In a first aspect, the present application provides a pixel circuit, which includes a switch circuit, a drive circuit and a light emitting circuit;

[0005] A switch circuit, used for initializing the driving circuit and conducting a path between the driving circuit and the light-emitting circuit;

[0006] A driving circuit, used for driving the light-emitting circuit and compensating for subthreshold current deviation and voltage fluctuation;

[0007] The light-emitting circuit is used to emit light under the drive of the driving circuit.

[0008] In one embodiment, the switch circuit includes a first switch circuit and a second switch circuit, and the drive circuit includes a first switch tube;

[0009] The control electrode and drain electrode of the first switch tube are connected to the first switch circuit, and the source electrode of the first switch tube is connected to the second switch circuit and the light-emitting circuit;

[0010] The first switch tube is used to drive the light-emitting circuit when it is turned on, and when the current of the light-emitting circuit is lower than a preset current value, compensate for the subthreshold current deviation according to the received first control signal; when the power supply voltage is lower than a preset voltage value, compensate for the voltage fluctuation according to the received second control signal.

[0011] In one embodiment, the first switch circuit comprises a second switch tube, a third switch tube and a storage capacitor;

[0012] The control electrode of the second switch tube is connected to the first signal terminal, the source electrode of the second switch tube is connected to the source electrode of the third switch tube, and the drain electrode of the second switch tube is connected to the first electrode of the storage capacitor and the control electrode of the first switch tube;

[0013] The second electrode of the storage capacitor is connected to the drain electrode of the third switch tube;

[0014] The control electrode of the third switch tube is connected to the second signal terminal, the source electrode of the third switch tube is also connected to the drain electrode of the first switch tube, and the drain electrode of the third switch tube is connected to the power supply terminal;

[0015] When the second switch tube and the third switch tube are turned on, the power supply voltage at the power supply end initializes the first switch tube.

[0016] In one embodiment, the second switch circuit includes a fourth switch tube and a fifth switch tube;

[0017] The control electrode of the fourth switch tube is connected to the third signal terminal, the drain electrode of the fourth switch tube is respectively connected to the source electrode of the first switch tube and the drain electrode of the fifth switch tube, and the source electrode of the fourth switch tube is connected to the data writing terminal;

[0018] The control electrode of the fifth switch tube is connected to the fourth signal terminal, and the source electrode of the fifth switch tube is connected to the light-emitting circuit;

[0019] When the fourth switch tube is turned on, the data voltage at the data writing end writes data into the first switch tube;

[0020] When the fifth switch tube is turned on, the first switch tube drives the light-emitting circuit to emit light.

[0021] In one embodiment, the light emitting circuit comprises an organic light emitting diode, and an anode of the organic light emitting diode is connected to a source of the fifth switch tube;

[0022] The organic light emitting diode emits light when the first switch tube, the third switch tube and the fifth switch tube are turned on.

[0023] In a second aspect, the present application further provides a display device, which includes the pixel circuit as described in the first aspect above.

[0024] In a third aspect, the present application further provides a method for controlling a pixel circuit, the method comprising:

[0025] Inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used to control the switch circuit to initialize a drive circuit of the pixel circuit;

[0026] Inputting a second control signal to the switch circuit, the second control signal being used to control the switch circuit to form a gate-source voltage difference of the drive circuit;

[0027] Inputting a third control signal to the switch circuit, the third control signal being used to control the switch circuit to write data to the drive circuit;

[0028] A fourth control signal is input to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0029] In one embodiment, the method further comprises:

[0030] Obtaining a subthreshold current value of the first switch tube;

[0031] A small current difference is determined based on the subthreshold current value and the theoretical current value; the small current difference is used to compensate for the subthreshold current deviation.

[0032] In one embodiment, the method further comprises:

[0033] Obtaining a voltage value of the first switch tube;

[0034] A small voltage difference is determined based on the voltage value and the theoretical voltage value, and the small voltage difference is used to compensate for voltage fluctuations.

[0035] In one embodiment, the method further comprises:

[0036] The current of the light-emitting circuit is determined according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

[0037] In a fourth aspect, the present application further provides a control device for a pixel circuit, the device comprising:

[0038] A first control module, used for inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used for controlling the switch circuit to initialize a drive circuit of the pixel circuit;

[0039] A second control module, used for inputting a second control signal to the switch circuit, the second control signal being used for controlling the switch circuit to form a gate-source voltage difference of the drive circuit;

[0040] A third control module, used for inputting a third control signal to the switch circuit, where the third control signal is used for controlling the switch circuit to write data to the drive circuit;

[0041] The fourth control module is used to input a fourth control signal to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0042] In a fifth aspect, the present application further provides a control terminal, which includes a storage chip and a processing chip, wherein the storage chip stores a computer program, and the processing chip implements the method steps of the third aspect when executing the computer program.

[0043] In a sixth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method steps of the third aspect are implemented.

[0044] In a seventh aspect, the present application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the method steps of the third aspect are implemented.

[0045] The above-mentioned pixel circuit and control method, display device, apparatus, control terminal and medium, the pixel circuit includes a switching circuit, a driving circuit and a light-emitting circuit; the switching circuit can initialize the driving circuit and conduct the path between the driving circuit and the light-emitting circuit; the driving circuit can drive the light-emitting circuit and compensate for subthreshold current deviation and voltage fluctuation; the light-emitting circuit can emit light under the drive of the driving circuit. The present application combines the switching circuit, the driving circuit and the light-emitting circuit to achieve efficient driving of the light-emitting unit, and effectively improves the uniformity and brightness of the light output. The driving circuit has the function of compensating for subthreshold current deviation and voltage fluctuation, which helps to improve the stability of the circuit under different working environments, reduce performance fluctuations caused by external factors, and improve the reliability of the system by optimizing the circuit links, reducing the failure rate and extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A 7T1C circuit diagram in the related art in one embodiment;

[0047] Figure 2 A timing diagram of 7T1C in the related art in one embodiment;

[0048] Figure 3 is a schematic diagram of a pixel circuit in an embodiment;

[0049] Figure 4 A schematic diagram of a switch circuit in an embodiment;

[0050] Figure 5 is a schematic diagram of a first switch circuit in an embodiment;

[0051] Figure 6 is a schematic diagram of a second switch circuit in one embodiment;

[0052] Figure 7 A schematic diagram of a light-emitting circuit in an embodiment;

[0053] Figure 8 A diagram showing an application environment of a method for controlling a pixel circuit in an embodiment;

[0054] Fig. 9 is a flow chart of a method for controlling a pixel circuit in one embodiment;

[0055] Fig.10 A schematic diagram of a process for determining a small current difference in one embodiment;

[0056] Fig.11 A schematic diagram of a process for determining a small voltage difference in one embodiment;

[0057] Fig.12 A timing diagram for determining the operation of a pixel circuit in one embodiment;

[0058] Fig.13 FIG. 4 is a structural block diagram of a control device for a pixel circuit in an embodiment. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] First of all, before specifically introducing the technical solution of the embodiments of the present application, the technical background based on the embodiments of the present application is introduced.

[0061] During the AMOLED (Active Matrix Organic Light Emitting Diode, display panel) display process, the pixel driving circuit drives the light-emitting device to emit light. Figure 1 and 2 As shown, in the related art, the pixel driving circuit includes a driving transistor, and the gate of the driving transistor has a leakage current phenomenon, which is relatively poor in stability, resulting in unstable luminance of the light-emitting device, thereby affecting the display quality of the AMOLED display panel. Due to the problems of more TFT tubes and more digital signals in the 7T1C circuit, the layout is relatively extreme, and brightness uniformity, Irdrop, etc. will be affected.

[0062] Based on this, the present application provides a pixel circuit and control method, a display device, an apparatus, a control terminal and a medium, aiming to solve the above-mentioned technical problems.

[0063] In an exemplary embodiment, Figure 3 As shown, an embodiment of the present application provides a pixel circuit, which includes a switch circuit 1, a drive circuit 2 and a light-emitting circuit 3.

[0064] The switch circuit 1 is used to initialize the driving circuit 2 and to conduct the path between the driving circuit 2 and the light-emitting circuit 3 .

[0065] Specifically, the main function of the switch circuit is to initialize the drive circuit and, when necessary, to open the path between the drive circuit and the light-emitting circuit. Through the control of this circuit, the entire signal path can be effectively managed to ensure that the drive signal can be effectively transmitted to the light-emitting circuit. During the initialization phase, the switch circuit can reset the state of the drive circuit to ensure the stability of the pixel circuit at each refresh.

[0066] The driving circuit 2 is used to drive the light-emitting circuit 3 and compensate for subthreshold current deviation and voltage fluctuation.

[0067] Specifically, the driving circuit is responsible for current driving the light-emitting circuit. A compensation mechanism is designed for this part of the circuit, which can effectively compensate for the effects caused by subthreshold current deviation and voltage fluctuation. It should be noted that the subthreshold current of the switch tube is the current of the switch tube in the subthreshold region, that is, the drain current when the gate-source voltage is lower than the threshold voltage. The subthreshold current involved in this application can be understood as the tiny drain current that still exists when the gate-source voltage of a semiconductor device (such as a MOSFET switch tube) is lower than the threshold voltage (that is, the device is theoretically "cut off"). The subthreshold current is a key parameter for measuring the low power consumption performance of the device, especially when the integrated circuit is in the standby state. It has a significant impact on power consumption. Through the feedback mechanism, the driving circuit monitors the working state of the light-emitting circuit in real time, adjusts the output current, and ensures the consistency of the light-emitting performance. This mechanism not only improves the robustness of the circuit, but also improves the stability of the display effect.

[0068] The light-emitting circuit 3 is used to emit light under the drive of the driving circuit 2.

[0069] Specifically, the light-emitting circuit 3 is the core part of the pixel circuit, and its main function is to emit light under the action of the driving circuit 2. The light-emitting circuit 3 can use a variety of light-emitting elements, such as OLED or LED, to achieve different types of display requirements. Under the stable drive of the driving circuit 2, the light-emitting circuit 3 can output light with uniform brightness and rich colors to meet the needs of high-quality display.

[0070] In actual implementation, the startup process of the pixel circuit is as follows:

[0071] Switching circuit initialization: The control signal of the switching circuit initializes the driving circuit. The trigger is set to a high level, the MOSFET is turned on, and the driving circuit is ready to receive signals.

[0072] Conduction control: The switch circuit opens the path to the light-emitting circuit through a control signal, allowing the drive circuit to supply current to the light-emitting circuit.

[0073] Signal drive: The drive circuit receives the input signal and adjusts the output current based on the feedback monitoring results. The operational amplifier compares the output current with the target current in real time and adjusts the output to ensure the normal operation of the compensation mechanism.

[0074] Light control: When the driving circuit runs stably, the light circuit starts to emit light. The light intensity is directly determined by the current, and with high-precision feedback control, the brightness consistency can be achieved.

[0075] The above-mentioned pixel circuit and control method, display device, apparatus, chip and storage medium, the pixel circuit includes a switching circuit, a driving circuit and a light-emitting circuit; the switching circuit can initialize the driving circuit and conduct the path between the driving circuit and the light-emitting circuit; the driving circuit can drive the light-emitting circuit and compensate for subthreshold current deviation and voltage fluctuation; the light-emitting circuit can emit light under the drive of the driving circuit. The present application combines the switching circuit, the driving circuit and the light-emitting circuit to achieve efficient driving of the light-emitting unit, and effectively improves the uniformity and brightness of the light output. The driving circuit has the function of compensating for subthreshold current deviation and voltage fluctuation, which helps to improve the stability of the circuit under different working environments, reduce performance fluctuations caused by external factors, and improve the reliability of the system by optimizing the circuit links, reducing the occurrence of failures and extending the service life of the equipment.

[0076] In an exemplary embodiment, based on the above embodiment, see Figure 4 The switch circuit 1 includes a first switch circuit 11 and a second switch circuit 12 , and the drive circuit 2 includes a first switch tube M1 .

[0077] The control electrode and the drain electrode of the first switch tube M1 are connected to the first switch circuit, and the source electrode of the first switch tube is connected to the second switch circuit and the light-emitting circuit.

[0078] The first switch tube M1 is used to drive the light-emitting circuit when it is turned on, and when the current of the light-emitting circuit is lower than the preset current value, compensate the subthreshold current deviation according to the received first control signal; when the power supply voltage is lower than the preset voltage value, compensate the voltage fluctuation according to the received second control signal.

[0079] Specific components of the switching circuit may include:

[0080] MOSFET (Metal Oxide Semiconductor Field Effect Transistor): Used to achieve efficient switching control.

[0081] Resistors: limit current flow and cooperate with switching circuits to protect circuit safety.

[0082] The first switch circuit generates a control signal to initialize the drive circuit, while the second switch circuit ensures the connection between the conduction circuit and the light-emitting circuit, and realizes state switching through the logic control switch.

[0083] The driving circuit comprises: a first switch tube, a control electrode and a drain electrode of which are connected to the first switch circuit, and a source electrode of which is connected to the second switch circuit and the light-emitting circuit.

[0084] Specific components can be used:

[0085] NMOS or PMOS: As the first switch tube, select the appropriate type to control the current according to the needs.

[0086] Operational amplifier: used to monitor the current value in real time, evaluate whether it is lower than the preset current value, and make adjustments.

[0087] The main function of the driving circuit is to provide current drive to the light-emitting circuit in the on state. In addition, when the current of the light-emitting circuit is lower than the preset value, the subthreshold current is compensated according to the received control signal to ensure the stability of the display brightness.

[0088] The light-emitting circuit is used to emit light and may include:

[0089] OLED or LED display: A light-emitting element used to display color.

[0090] Light sensor: monitors the amount of light emitted and adjusts the output brightness as needed.

[0091] The pixel circuit of the embodiment of the present application achieves effective compensation for subthreshold current deviation and voltage fluctuation by reasonably integrating the first switch circuit, the second switch circuit and the drive circuit and utilizing multiple controls of the first switch tube. This design significantly improves the stability and response accuracy of the display unit and solves the problem of uneven display commonly found in traditional pixel circuits.

[0092] In an exemplary embodiment, based on the above embodiment, see Figure 5 The first switch circuit of the present application includes a second switch tube M2, a third switch tube M3 and a storage capacitor Cst.

[0093] Among them, the control electrode of the second switch tube M2 is connected to the first signal terminal S2, the source electrode of the second switch tube M2 is connected to the source electrode of the third switch tube M3, the drain electrode of the second switch tube M2 is connected to the first electrode of the storage capacitor Cst and the control electrode of the first switch tube M1; the second electrode of the storage capacitor Cst is connected to the drain electrode of the third switch tube M3; the control electrode of the third switch tube M3 is connected to the second signal terminal EM1, the source electrode of the third switch tube M3 is also connected to the drain electrode of the first switch tube M1, and the drain electrode of the third switch tube M3 is connected to the power supply terminal.

[0094] When the second switch tube M2 and the third switch tube M3 are turned on, the power supply voltage at the power supply end initializes the first switch tube.

[0095] Specifically, when the second switch tube M2 and the third switch tube M3 are turned on, the control terminal can establish a connection between the first signal terminal and the power supply terminal ELVDD. At this time, the first switch tube is initialized through the power supply voltage of the power supply terminal to prepare the drive circuit and ensure that it can work stably in subsequent operations.

[0096] The specific working steps are as follows:

[0097] Switch control signal: After receiving the control signal from the first signal terminal and the second signal terminal, the second switch tube and the third switch tube are turned on at the same time. At this time, the source of the second switch tube is connected to the source of the third switch tube, and the current can pass through the switch tube smoothly.

[0098] Charging the storage capacitor: When the second switch tube is turned on, its drain is connected to the first electrode of the storage capacitor, and the storage capacitor begins to charge, and the stored charge provides the necessary voltage for subsequent operations.

[0099] Power initialization: At the same time, the third switch tube is also in the on state, and its drain is connected to the power supply end, so that the power supply voltage of the power supply end is effectively transmitted to the first switch tube. After storage and transmission by the storage capacitor, the first switch tube obtains sufficient control voltage for initialization.

[0100] Stable circuit operation: After initialization, the switch circuit can work stably, ensuring that subsequent signals can be effectively transmitted to the drive circuit and the light-emitting circuit. The system can remain stable under different working conditions, reduce power consumption, and improve the efficiency of signal transmission.

[0101] In the embodiment of the present application, the switch circuit is optimized to have higher stability and reliability. In addition, the design of the storage capacitor can effectively reduce unnecessary energy consumption caused by signal transmission delay. The overall circuit is improved in power initialization, current stability, and operation response speed, which helps to achieve high-quality display effects.

[0102] In an exemplary embodiment, based on the above embodiment, see Figure 6 The second switch circuit 12 of the present application includes a fourth switch tube M4 and a fifth switch tube M5.

[0103] Among them, the control electrode of the fourth switch tube M4 is connected to the third signal terminal S1, the drain of the fourth switch tube M4 is respectively connected to the source of the first switch tube M1 and the drain of the fifth switch tube M5, and the source of the fourth switch tube M4 is connected to the data writing terminal; the control electrode of the fifth switch tube M5 is connected to the fourth signal terminal EM2, and the source of the fifth switch tube M5 is connected to the light-emitting circuit 3.

[0104] When the fourth switch tube M4 is turned on, the data voltage at the data writing end writes data into the first switch tube M1 ; when the fifth switch tube M5 is turned on, the first switch tube M1 drives the light emitting circuit 3 to emit light.

[0105] In this structure, the working logic of the second switch circuit is as follows:

[0106] When the control electrode of the fourth switch tube receives a signal (i.e., a high level signal at the third signal terminal), the fourth switch tube is turned on. At this time, the voltage signal transmitted from the data writing terminal is directly transmitted to the source electrode of the first switch tube through the fourth switch tube, thereby implementing a data writing operation on the first switch tube.

[0107] After the data is written, the first switch tube determines its state according to the input voltage level, thereby preparing for the subsequent light-emitting process.

[0108] Luminescence control process:

[0109] When the control signal of the fifth switch tube (from the fourth signal terminal) receives a high-level signal, it will be turned on. At this time, the first switch tube will pass the current to the light-emitting circuit according to the previous data writing state. This process ensures that the light-emitting circuit can emit light according to the written data state. At this time, the conduction condition of the first switch tube is combined with the correctness of the input signal, so that the light-emitting circuit lights up when the conditions are met, thereby achieving the light response effect of the pixel.

[0110] In the embodiment of the present application, the two switching tubes work together to achieve efficient and accurate data writing and light emission control, which helps to ensure that the pixel can still maintain the expected performance in the case of voltage fluctuations or signal interference.

[0111] In an exemplary embodiment, based on the above embodiment, see Figure 7 The light emitting circuit of the present application includes an organic light emitting diode Oled, the anode of the organic light emitting diode is connected to the source of the fifth switch tube M5. The organic light emitting diode emits light when the first switch tube M1, the third switch tube M3 and the fifth switch tube M5 are turned on.

[0112] Light-emitting circuit structure:

[0113] Organic light emitting diode (OLED): a light emitting element, whose anode is connected to the source of the fifth switch tube.

[0114] The fifth switch tube: Its source is connected to the anode of the OLED, and its drain is connected to the power supply through an appropriate resistor. This switch tube is responsible for adjusting the conduction state of the OLED.

[0115] The first switch tube: connected to the first switch circuit, responsible for providing power to the light-emitting circuit.

[0116] The third switch tube is used to control the grounding state of the OLED and shares the same grounding line with the light-emitting circuit.

[0117] The working status of the light-emitting circuit is as follows:

[0118] Initialization stage: When the system starts, a control signal is sent through the first switch circuit to drive the first switch tube to conduct and provide power to the light-emitting circuit. At the same time, the third switch tube remains in the closed state to ensure the safety of the circuit.

[0119] Conduction control: In order to make the OLED emit light, the first switch tube, the third switch tube and the fifth switch tube must be turned on at the same time.

[0120] The control signal is implemented as follows:

[0121] The first switch tube is turned on to provide a constant power supply to the light emitting circuit to ensure the normal operation of the organic light emitting diode.

[0122] The third switch tube is turned on: it is grounded to form a complete circuit closed loop, allowing current to flow effectively.

[0123] The fifth switch tube is turned on: it is directly connected to the anode to adjust the current flowing to the OLED.

[0124] Light emission: When all three switches are turned on, current flows through the OLED, stimulating its organic material to emit visible light. Depending on the power supply voltage and the actual current flowing through the OLED, the OLED can precisely control the brightness and color output.

[0125] Current compensation mechanism: When the current of the light-emitting circuit is lower than the preset value, the conduction state of the first switch tube, the third switch tube and the fifth switch tube can be dynamically adjusted according to the received first control signal to compensate for possible current shortage and ensure the stability of the light-emitting effect.

[0126] The embodiment of the present application realizes efficient driving of the organic light emitting diode by rationally designing and controlling the switch tubes, and solves the common current shortage and voltage fluctuation problems in display devices by precisely regulating the states of multiple switch tubes.

[0127] In one embodiment, the present application further provides a display device, which includes the pixel circuit as described above.

[0128] The display device may include the following components:

[0129] Display panel: The display panel is composed of several pixel units, each of which includes the aforementioned pixel circuit. Each pixel circuit can independently control its light-emitting state to form a complete image display.

[0130] Control circuit: The control circuit is responsible for generating control signals and sending control signals to the first, second and third switch tubes in each pixel circuit to ensure accurate control of each pixel unit. The control circuit can adjust the brightness and color of each pixel in real time according to the input image data.

[0131] Data input terminal: The data input terminal is used to receive image data from a graphics processor (GPU) or other video source. This data is transmitted to the data writing terminal in each pixel circuit through the data line to achieve dynamic control of the pixel.

[0132] The pixel circuit control method provided in the embodiment of the present application can be applied to Figure 8 In the application environment shown. Among them, the control end 01 inputs a first control signal to the switch circuit 1 of the pixel circuit, and the first control signal is used to control the switch circuit 1 to initialize the driving circuit of the pixel circuit; inputs a second control signal to the switch circuit 1, and the second control signal can control the switch circuit 1 to form a gate-source voltage difference of the driving circuit 2; inputs a third control signal to the switch circuit 1, and the third control signal can control the switch circuit 1 to write data to the driving circuit 2; inputs a fourth control signal to the switch circuit 1, and the fourth control signal can control the driving circuit 2 to drive the light-emitting circuit 3 of the pixel circuit to emit light. Among them, the control end can be a control chip, a microcontroller, etc. integrated in the terminal.

[0133] In one embodiment, Fig. 9 As shown, a control method for a pixel circuit is provided, and the method is applied to Figure 8 The control end in the example is used to illustrate, including the following steps:

[0134] S201, input a first control signal to a switch circuit of a pixel circuit.

[0135] The first control signal is used to control the switch circuit to initialize the driving circuit of the pixel circuit.

[0136] In the embodiment of the present application, the control terminal inputs a first control signal to the switch circuit of the pixel circuit. The function of the signal is to control the switch circuit to initialize the drive circuit of the pixel circuit to ensure that the circuit is in a safe initial state. During the initialization process, all switch tubes are set to the cut-off state to prevent accidental current flow and ensure the safety of circuit components.

[0137] S202, input a second control signal to the switch circuit.

[0138] The second control signal is used to control the switch circuit to form a gate-source voltage difference of the driving circuit.

[0139] In the embodiment of the present application, the control terminal inputs a second control signal to the switch circuit, the purpose of which is to control the switch circuit to form a gate-source voltage difference (Vgs) of the drive circuit. At this stage, the drive circuit is activated by adjusting the voltage difference between the gate and the source to ensure that it has working ability. The precise control of this voltage difference effectively improves the accuracy of subsequent data reading.

[0140] S203, inputting a third control signal to the switch circuit, where the third control signal is used to control the switch circuit to write data into the drive circuit.

[0141] In the embodiment of the present application, after the voltage difference is established, a third control signal is input to the switch circuit, which is used to control the switch circuit to write data to the drive circuit. In this step, the drive signal is transmitted to the pixel circuit through the first switch tube, and the corresponding voltage level is written into the pixel according to the designed image data, ensuring that each pixel can correctly receive the required excitation signal.

[0142] S204, input a fourth control signal to the switch circuit, where the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0143] In the embodiment of the present application, the control end inputs a fourth control signal to the switch circuit, which is used to control the drive circuit to drive the light-emitting circuit of the pixel circuit to emit light. At this stage, when all the above steps are successfully completed, the drive circuit converts the collected data into current and drives the OLED to emit light to achieve the expected display effect. Correct signal control and driving capability ensure that the brightness and color of the pixel are in the best state.

[0144] The precise control of each signal in the embodiment of the present application ensures the rapid response and stable output of the pixel, and improves the clarity and color reproduction of the display. The control of initialization and gate-source voltage difference greatly reduces the risk of circuit damage caused by excessive current, and ensures the reliability of long-term operation of the system. The method realizes efficient data input and light emission control through standardized control steps, simplifies the operation process, and improves the ease of use of the system.

[0145] In an exemplary embodiment, based on the above embodiment, see Fig.10 , the method of the present application also includes:

[0146] S301, obtaining a subthreshold current value of a first switch tube.

[0147] In the embodiment of the present application, the output current of the first switch tube is monitored in real time by a data acquisition module in the control circuit. According to a specific time interval and voltage, the subthreshold current value is recorded by feedback of the state of the switch tube. The obtained subthreshold current value is stored in a microcontroller (MCU) or a corresponding data storage device for use in subsequent steps.

[0148] S302, determining a small current difference according to the subthreshold current value and the theoretical current value, wherein the small current difference is used to compensate for the subthreshold current deviation.

[0149] Theoretical Current Value: According to the working conditions and requirements of the display device, the theoretical current value (IdealCurrent Value) is calculated. This value is usually based on the design specifications and expected output.

[0150] Calculate small current difference: By comparing the obtained subthreshold current value with the theoretical current value, calculate the small current difference (Small Current Difference).

[0151] The calculation formula for the tiny current difference is: tiny current difference = theoretical current value - subthreshold current value.

[0152] Compensation mechanism: This tiny current difference can be used to adjust the subsequent control signal to compensate for the insufficient current caused by the subthreshold current deviation, thereby ensuring the optimal luminous state of the OLED. Compensation can be achieved by dynamically adjusting the conduction time or voltage amplitude of the first switch tube.

[0153] In the embodiment of the present application, the control accuracy of the first switch tube is improved by real-time monitoring and compensation of the subthreshold current, thereby ensuring that the OLED can emit light stably in all working states. By reducing the brightness fluctuation caused by current deviation, the consistency of the display effect is improved, and the user's visual experience is enhanced.

[0154] In an exemplary embodiment, based on the above embodiment, see Fig.11 , the method of the present application further comprises the following steps:

[0155] S401, obtaining a voltage value of a first switch tube.

[0156] In the embodiment of the present application, the control end first needs to obtain the working voltage value of the first switch tube (usually used as the switch element of the driving circuit). This can be achieved through a built-in voltage sensor to measure the voltage across the switch tube to obtain a real-time voltage state.

[0157] S402, determining a small voltage difference according to the voltage value and the theoretical voltage value, where the small voltage difference is used to compensate for voltage fluctuation.

[0158] In the embodiment of the present application, the obtained voltage value is compared with the preset theoretical voltage value. If a difference is found between the two, the control end will calculate the voltage difference, which is called a small voltage difference. This information will be used to dynamically adjust the voltage and improve the stability of the system under fluctuating conditions. The small voltage difference can be detected by increasing the compensation time according to formula (1):

[0159] (1)

[0160] In an exemplary embodiment, based on the above embodiment, the method of the embodiment of the present application further includes:

[0161] The current of the light-emitting circuit is determined according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

[0162] Among them, capacitance per unit area (Cox): the capacitance value per unit area is obtained through design specifications or experimental measurements.

[0163] Mobility (μ): Mobility refers to the ability of carriers to migrate under the action of an electric field. This value is usually obtained through experiments or found based on material properties.

[0164] Aspect ratio (W / L): This ratio is the ratio of the width (W) to the length (L) of the switch tube, which can affect the conduction capability of the switch tube.

[0165] Data voltage (V_data): records the voltage value to be written into the driving circuit, which usually comes from the image signal processing stage.

[0166] Small voltage difference (ΔVsub): According to the small current difference calculated in step S302, the small voltage difference of the first switch tube is determined.

[0167] Source voltage (Vsource): record the source voltage value of the first switch tube in the driving circuit. Use the following formula (2) to combine the above parameters to determine the current of the light-emitting circuit:

[0168] (2)

[0169] like Fig.12As shown, the circuit works as follows in phase T1:

[0170] (1) S2 and EM1 are set high, and ELVDD is written into the gate of DTFT (M1) through M4 and M3 to complete initialization.

[0171] (2) ELVDD reaches the M1Source end through M4 and M1, at which time Vsource = ELVDD-VTH.

[0172] T2 stage.

[0173] When S2 is set high, the voltage difference between the gate and source of M1 is VTH+∆SUB. Due to the SS deviation, the subthreshold current flows through M1, which can be used to detect small current differences.

[0174] Phase T3: S1 and S2 are set high, Data is written to the source end of T1, Vgate=Vdata+VTH+ ∆Vsub, based on the above formula, the changes of VTH and SS of DTFT can be detected. Phase T4:

[0175] EM1 and EM2 are set high, and the gate voltage is still Vdata+VTH+ ∆Vsub.

[0176] ELVDD makes OLED emit light through M4, M1, and M5.

[0177] In the original 7T1C circuit, the current changes from 203nA to 195.4nA, the current change within one frame is 7.6nA, and the gate voltage change is 0.024V.

[0178] In the 5T1C circuit of the present application, the current changes from 204.4nA to 201.8nA, the current change within one frame is 2.6nA, and the gate voltage change is 0.009V. The current of the new 5T1C circuit tends to be stable during the light-emitting stage, which solves the OLED current fluctuation caused by the offset of SS and VTH of DTFT and enhances the image quality of AMOLED display.

[0179] In the embodiment of the present application, by real-time monitoring of the voltage of the switch tube and compensation, the display device can maintain a steady state under different working conditions, avoiding image flickering or color unevenness. Accurate voltage control combined with compensation mechanism helps to improve the response speed and brightness output of pixels.

[0180] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0181] Based on the same inventive concept, the embodiment of the present application also provides a pixel circuit control device for implementing the above-mentioned pixel circuit control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above-mentioned method, so the specific limitations in the embodiments of the control device for one or more pixel circuits provided below can refer to the limitations of the pixel circuit control method above, and will not be repeated here.

[0182] In one embodiment, Fig.13 As shown, a control device 500 of a pixel circuit is provided, comprising:

[0183] A first control module 501, used for inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used for controlling the switch circuit to initialize a drive circuit of the pixel circuit;

[0184] A second control module 502, used for inputting a second control signal to the switch circuit, the second control signal being used for controlling the switch circuit to form a gate-source voltage difference of the drive circuit;

[0185] A third control module 503, used for inputting a third control signal to the switch circuit, where the third control signal is used for controlling the switch circuit to write data to the drive circuit;

[0186] The fourth control module 504 is used to input a fourth control signal to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0187] In one embodiment, the above device further comprises:

[0188] A current value acquisition module, used to acquire the subthreshold current value of the first switch tube;

[0189] The current difference determination module is used to determine a small current difference according to the subthreshold current value and the theoretical current value; the small current difference is used to compensate for the subthreshold current deviation.

[0190] In one embodiment, the above device further comprises:

[0191] A first voltage acquisition module, used to acquire the voltage value of the first switch tube;

[0192] The voltage difference determination module is used to determine a small voltage difference according to the voltage value and the theoretical voltage value, and the small voltage difference is used to compensate for voltage fluctuations.

[0193] In one embodiment, the above device further comprises:

[0194] The current determination module is used to determine the current of the light-emitting circuit according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

[0195] Each module in the above-mentioned pixel circuit control device can be implemented in whole or in part by software, hardware or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0196] In one embodiment, a control terminal is provided, including a storage chip and a processing chip, wherein a computer program is stored in the storage chip, and the processing chip implements the following steps when executing the computer program:

[0197] Inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used to control the switch circuit to initialize a drive circuit of the pixel circuit;

[0198] Inputting a second control signal to the switch circuit, the second control signal being used to control the switch circuit to form a gate-source voltage difference of the drive circuit;

[0199] Inputting a third control signal to the switch circuit, the third control signal being used to control the switch circuit to write data to the drive circuit;

[0200] A fourth control signal is input to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0201] In one embodiment, the processing chip further implements the following steps when executing the computer program:

[0202] Obtaining a subthreshold current value of the first switch tube;

[0203] A small current difference is determined based on the subthreshold current value and the theoretical current value; the small current difference is used to compensate for the subthreshold current deviation.

[0204] In one embodiment, the processing chip further implements the following steps when executing the computer program:

[0205] Obtaining a voltage value of the first switch tube;

[0206] A small voltage difference is determined based on the voltage value and the theoretical voltage value, and the small voltage difference is used to compensate for voltage fluctuations.

[0207] In one embodiment, the processing chip further implements the following steps when executing the computer program:

[0208] The current of the light-emitting circuit is determined according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

[0209] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0210] Inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used to control the switch circuit to initialize a drive circuit of the pixel circuit;

[0211] Inputting a second control signal to the switch circuit, the second control signal being used to control the switch circuit to form a gate-source voltage difference of the drive circuit;

[0212] Inputting a third control signal to the switch circuit, the third control signal being used to control the switch circuit to write data to the drive circuit;

[0213] A fourth control signal is input to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0214] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0215] Obtaining a subthreshold current value of the first switch tube;

[0216] A small current difference is determined based on the subthreshold current value and the theoretical current value; the small current difference is used to compensate for the subthreshold current deviation.

[0217] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0218] Obtaining a voltage value of the first switch tube;

[0219] A small voltage difference is determined based on the voltage value and the theoretical voltage value, and the small voltage difference is used to compensate for voltage fluctuations.

[0220] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0221] The current of the light-emitting circuit is determined according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

[0222] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0223] Inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used to control the switch circuit to initialize a drive circuit of the pixel circuit;

[0224] Inputting a second control signal to the switch circuit, the second control signal being used to control the switch circuit to form a gate-source voltage difference of the drive circuit;

[0225] Inputting a third control signal to the switch circuit, the third control signal being used to control the switch circuit to write data to the drive circuit;

[0226] A fourth control signal is input to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

[0227] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0228] Obtaining a subthreshold current value of the first switch tube;

[0229] A small current difference is determined based on the subthreshold current value and the theoretical current value; the small current difference is used to compensate for the subthreshold current deviation.

[0230] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0231] Obtaining a voltage value of the first switch tube;

[0232] A small voltage difference is determined based on the voltage value and the theoretical voltage value, and the small voltage difference is used to compensate for voltage fluctuations.

[0233] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0234] The current of the light-emitting circuit is determined according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

[0235] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0236] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0237] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0238] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A pixel circuit, characterized in that: The pixel circuit includes a switch circuit, a drive circuit and a light emitting circuit; The switch circuit is used to initialize the drive circuit and conduct the path between the drive circuit and the light-emitting circuit; The driving circuit is used to drive the light-emitting circuit and compensate for subthreshold current deviation and voltage fluctuation; The light-emitting circuit is used for emitting light under the drive of the driving circuit.

2. The pixel circuit according to claim 1, characterized in that: The switch circuit includes a first switch circuit and a second switch circuit, and the drive circuit includes a first switch tube; The control electrode and drain electrode of the first switch tube are connected to the first switch circuit, and the source electrode of the first switch tube is connected to the second switch circuit and the light-emitting circuit; The first switching tube is used to drive the light-emitting circuit when it is turned on, and when the current of the light-emitting circuit is lower than a preset current value, compensate for the subthreshold current deviation according to the received first control signal; when the power supply voltage is lower than a preset voltage value, compensate for the voltage fluctuation according to the received second control signal.

3. The pixel circuit according to claim 2, characterized in that: The first switch circuit includes a second switch tube, a third switch tube and a storage capacitor; The control electrode of the second switch tube is connected to the first signal terminal, the source electrode of the second switch tube is connected to the source electrode of the third switch tube, and the drain electrode of the second switch tube is connected to the first electrode of the storage capacitor and the control electrode of the first switch tube; The second electrode of the storage capacitor is connected to the drain electrode of the third switch tube; The control electrode of the third switch tube is connected to the second signal terminal, the source electrode of the third switch tube is also connected to the drain electrode of the first switch tube, and the drain electrode of the third switch tube is connected to the power supply terminal; When the second switch tube and the third switch tube are turned on, the power supply voltage at the power supply end initializes the first switch tube.

4. The pixel circuit according to claim 3, characterized in that: The second switch circuit includes a fourth switch tube and a fifth switch tube; The control electrode of the fourth switch tube is connected to the third signal terminal, the drain electrode of the fourth switch tube is respectively connected to the source electrode of the first switch tube and the drain electrode of the fifth switch tube, and the source electrode of the fourth switch tube is connected to the data writing terminal; The control electrode of the fifth switch tube is connected to the fourth signal terminal, and the source electrode of the fifth switch tube is connected to the light-emitting circuit; When the fourth switch tube is turned on, the data voltage at the data writing end writes data into the first switch tube; When the fifth switch tube is turned on, the first switch tube drives the light-emitting circuit to emit light.

5. The pixel circuit according to claim 4, characterized in that: The light emitting circuit comprises an organic light emitting diode, and an anode of the organic light emitting diode is connected to a source of the fifth switch tube; The organic light emitting diode emits light when the first switch tube, the third switch tube and the fifth switch tube are turned on.

6. A display device, characterized in that: The display device comprises the pixel circuit according to any one of claims 1 to 5.

7. A method for controlling a pixel circuit, characterized in that: The method comprises: Inputting a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is used to control the switch circuit to initialize a drive circuit of the pixel circuit; Inputting a second control signal to the switch circuit, wherein the second control signal is used to control the switch circuit to form a gate-source voltage difference of the drive circuit; Inputting a third control signal to the switch circuit, wherein the third control signal is used to control the switch circuit to write data to the drive circuit; A fourth control signal is input to the switch circuit, and the fourth control signal is used to control the drive circuit to drive the light-emitting circuit of the pixel circuit to emit light.

8. The method according to claim 7, characterized in that The method further comprises: Acquiring a subthreshold current value of a first switch tube of the switch circuit; Determining a small current difference according to the subthreshold current value and the theoretical current value; the small current difference is used to compensate for the subthreshold current deviation; Preferably, the method further comprises: Acquiring a voltage value of a first switch tube of the switch circuit; Determining a small voltage difference according to the voltage value and the theoretical voltage value, wherein the small voltage difference is used to compensate for voltage fluctuations; and Preferably, the method further comprises: The current of the light-emitting circuit is determined according to the unit area capacitance, mobility, aspect ratio, data voltage, a small voltage difference of the first switch tube in the driving circuit and the source voltage of the first switch tube.

9. A pixel circuit control device, characterized in that: The device comprises: A first control module, configured to input a first control signal to a switch circuit of the pixel circuit, wherein the first control signal is configured to control the switch circuit to initialize a drive circuit of the pixel circuit; A second control module, used for inputting a second control signal to the switch circuit, wherein the second control signal is used for controlling the switch circuit to form a gate-source voltage difference of the drive circuit; A third control module, used for inputting a third control signal to the switch circuit, wherein the third control signal is used for controlling the switch circuit to write data to the drive circuit; The fourth control module is used to input a fourth control signal to the switch circuit, and the fourth control signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 7 to 8 are implemented.

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