Pixel circuit and control method, display device, apparatus, control terminal and medium

Abstract

This application relates to a 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 initializes the driving circuit and establishes a connection between the driving circuit and the light-emitting circuit. The driving circuit drives the light-emitting circuit and compensates for subthreshold current deviations and voltage fluctuations. The light-emitting circuit emits light under the drive of the driving circuit. This application, by combining the switching circuit, driving circuit, and light-emitting circuit, achieves efficient driving of the light-emitting unit, effectively improving the uniformity and brightness of light output. The driving circuit has the function of compensating for subthreshold current deviations and voltage fluctuations, which helps to improve the stability of the circuit under different operating environments, reduce performance fluctuations caused by external factors, improve system reliability, reduce failure rate, and extend the service life of the equipment by optimizing circuit components.

Description

Technical Field

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

[0002] In modern AMOLED (Organic Light Emitting Diode) display panels, the pixel driving circuit is a key component for achieving high-quality image display. This circuit controls the brightness of the light-emitting device by driving transistors, thereby displaying the image. However, current pixel driving circuits often face stability issues caused by leakage current. This leakage current not only affects the signal integrity of the driving transistor gate but also leads to instability in the light emission brightness, severely impacting the display effect and image quality of the AMOLED display panel. Summary of the Invention

[0003] Therefore, 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-mentioned technical problems.

[0004] In a first aspect, this application provides a pixel circuit, which includes a switching circuit, a driving circuit, and a light-emitting circuit;

[0005] A switching circuit is used to initialize the driving circuit and to connect the driving circuit and the light-emitting circuit.

[0006] The driving circuit is used to drive the light-emitting circuit and compensate for subthreshold current deviation and voltage fluctuation.

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

[0008] In one embodiment, the switching circuit includes a first switching circuit and a second switching circuit, and the driving circuit includes a first switching transistor.

[0009] The control electrode and drain of the first switching transistor are connected to the first switching circuit, and the source of the first switching transistor is connected to the second switching circuit and the light-emitting circuit.

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

[0011] In one embodiment, the first switching circuit includes a second switching transistor, a third switching transistor, and a storage capacitor;

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

[0013] The second terminal of the storage capacitor is connected to the drain of the third switching transistor;

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

[0015] With the second and third switching transistors turned on, the power supply voltage at the power supply terminal initializes the first switching transistor.

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

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

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

[0019] When the fourth switch is turned on, the data voltage at the data writing terminal writes data to the first switch.

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

[0021] In one embodiment, the light-emitting circuit includes an organic light-emitting diode, the anode of which is connected to the source of a fifth switching transistor.

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

[0023] Secondly, this application also provides a display device, which includes the pixel circuitry described in the first aspect above.

[0024] Thirdly, this application also provides a method for controlling a pixel circuit, the method comprising:

[0025] A first control signal is input to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit.

[0026] A second control signal is input to the switching circuit. The second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit.

[0027] A third control signal is input to the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0028] A fourth control signal is input to the switching circuit. 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 includes:

[0030] Obtain the subthreshold current value of the first switching transistor;

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

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

[0033] Obtain the voltage value of the first switching transistor;

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

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

[0036] The current of the light-emitting circuit is determined based on the unit area capacitance, mobility, aspect ratio, data voltage, the small voltage difference of the first switching transistor in the driving circuit, and the source voltage of the first switching transistor.

[0037] Fourthly, this application also provides a control device for a pixel circuit, the device comprising:

[0038] The first control module is used to input a first control signal to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit.

[0039] The second control module is used to input a second control signal to the switching circuit. The second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit.

[0040] The third control module is used to input a third control signal into the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0041] The fourth control module is used to input a fourth control signal to the switching circuit. 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] Fifthly, this application also provides a control terminal. The control terminal includes a memory chip and a processing chip. The memory chip stores a computer program, and the processing chip executes the computer program to implement the method steps described in the third aspect.

[0043] Sixthly, this application also provides a computer-readable storage medium. This computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the method steps of the third aspect described above.

[0044] In a seventh aspect, this application also provides a computer program product. This computer program product includes a computer program that, when executed by a processor, implements the method steps described in the third aspect.

[0045] The aforementioned pixel circuit, control method, display device, apparatus, control terminal, and medium include a pixel circuit comprising a switching circuit, a driving circuit, and a light-emitting circuit. The switching circuit initializes the driving circuit and establishes a connection between the driving circuit and the light-emitting circuit. The driving circuit drives the light-emitting circuit and compensates for subthreshold current deviations and voltage fluctuations. The light-emitting circuit emits light under the drive of the driving circuit. This application, combining the switching circuit, driving circuit, and light-emitting circuit, achieves efficient driving of the light-emitting unit, effectively improving the uniformity and brightness of light output. The driving circuit's compensation function for subthreshold current deviations and voltage fluctuations helps improve the circuit's stability under different operating environments, reduces performance fluctuations caused by external factors, and improves system reliability, reduces the failure rate, and extends the equipment's service life through circuit optimization. Attached Figure Description

[0046] Figure 1 Here is a circuit diagram of the 7T1C in a related technology in one embodiment;

[0047] Figure 2 This is a timing diagram of the 7T1C in a related technology in one embodiment;

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

[0049] Figure 4 This is a schematic diagram of a switching circuit in one embodiment;

[0050] Figure 5 This is a schematic diagram of the first switching circuit in one embodiment;

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

[0052] Figure 7 This is a schematic diagram of the light-emitting circuit in one embodiment;

[0053] Figure 8 This is an application environment diagram of the pixel circuit control method in one embodiment;

[0054] Figure 9 This is a flowchart illustrating a control method for a pixel circuit in one embodiment;

[0055] Figure 10 This is a flowchart illustrating the process of determining a minute current difference in one embodiment;

[0056] Figure 11 This is a flowchart illustrating the process of determining a small voltage difference in one embodiment;

[0057] Figure 12 This is a timing diagram of the pixel circuitry in one embodiment;

[0058] Figure 13 This is a structural block diagram of the control device for the pixel circuit in one embodiment. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0060] First, before introducing the technical solutions of the embodiments of this application in detail, the technical background on which the embodiments of this application are based will be introduced.

[0061] In the AMOLED (Active Matrix Organic Light Emitting Diode) display process, the pixel driving circuit drives the light-emitting device to emit light. For example... Figure 1 and 2 As shown, in related technologies, the pixel driving circuit includes a driving transistor. The gate of the driving transistor exhibits leakage current, resulting in poor stability and unstable light emission from the light-emitting device, which in turn affects the display quality of the AMOLED display panel. Due to the large number of TFT transistors and digital signals in the 7T1C circuit, the layout is quite limited, affecting brightness uniformity and Irdrop.

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

[0063] In one exemplary embodiment, such as Figure 3 As shown, this application embodiment provides a pixel circuit, which includes a switching circuit 1, a driving circuit 2, and a light-emitting circuit 3.

[0064] Among them, the switch circuit 1 is used to initialize the drive circuit 2 and to connect the drive circuit 2 and the light-emitting circuit 3.

[0065] Specifically, the main function of the switching circuit is to initialize the driving circuit and, when needed, connect the driving circuit and the light-emitting circuit. Through the control of this circuit, effective management of the entire signal path can be achieved, ensuring that the driving signal is effectively transmitted to the light-emitting circuit. During the initialization phase, the switching circuit can reset the state of the driving circuit, ensuring the stability of the pixel circuit with 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 driving the light-emitting circuit with current. This part of the circuit is designed with a compensation mechanism to effectively compensate for the effects of subthreshold current deviation and voltage fluctuations. It should be noted that the subthreshold current of the switching transistor is the current of the switching transistor 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 small drain current that still exists in a semiconductor device (such as a MOSFET switch) when the gate-source voltage is lower than the threshold voltage (i.e., the device is theoretically "cut off"). The subthreshold current is a key parameter for measuring the low-power performance of a device, especially having a significant impact on power consumption in the standby state of integrated circuits. Through a feedback mechanism, the driving circuit monitors the operating status of the light-emitting circuit in real time and adjusts the output current to ensure the consistency of the light-emitting performance. This mechanism not only improves the robustness of the circuit but also enhances 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 component 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 employ various light-emitting elements, such as OLED or LED, to meet different 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, meeting the needs of high-quality displays.

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

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

[0072] On-time control: The switching circuit opens the path to the light-emitting circuit through a control signal, allowing the driving circuit to supply current to the light-emitting circuit.

[0073] Signal-driven: 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 emission control: Once the driving circuit is running stably, the light emission circuit begins to emit light. The light intensity is directly determined by the current magnitude, and with high-precision feedback control, consistent brightness can be achieved.

[0075] The aforementioned pixel circuit and control method, display device, apparatus, chip, and storage medium include a pixel circuit comprising a switching circuit, a driving circuit, and a light-emitting circuit. The switching circuit initializes the driving circuit and establishes a connection between the driving circuit and the light-emitting circuit. The driving circuit drives the light-emitting circuit and compensates for subthreshold current deviations and voltage fluctuations. The light-emitting circuit emits light under the drive of the driving circuit. This application, combining the switching circuit, driving circuit, and light-emitting circuit, achieves efficient driving of the light-emitting unit, effectively improving the uniformity and brightness of light output. The driving circuit's compensation function for subthreshold current deviations and voltage fluctuations helps improve the circuit's stability under different operating environments, reduces performance fluctuations caused by external factors, and improves system reliability, reduces the failure rate, and extends the equipment's service life through circuit optimization.

[0076] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 4 The aforementioned switching circuit 1 includes a first switching circuit 11 and a second switching circuit 12, and the driving circuit 2 includes a first switching transistor M1.

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

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

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

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

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

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

[0083] The driving circuit includes a first switching transistor, whose control electrode and drain are connected to a first switching circuit, and whose source is connected to a second switching circuit and a light-emitting circuit.

[0084] Specific components can be adopted as follows:

[0085] NMOS or PMOS: As the first switching transistor, select the appropriate type for current control as needed.

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

[0087] The main function of this driver circuit is to provide current to the light-emitting circuit when it is in the ON state. Furthermore, when the current of the light-emitting circuit falls below a preset value, subthreshold current compensation is performed based on the received control signal to ensure stable display brightness.

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

[0089] OLED or LED displays: Light-emitting elements used to display colors.

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

[0091] The pixel circuit of this application embodiment achieves effective compensation for subthreshold current deviation and voltage fluctuation by rationally integrating the first switching circuit, the second switching circuit, and the driving circuit, and utilizing multiple controls of the first switching transistor. This design significantly improves the stability and response accuracy of the display unit and solves the display unevenness problem commonly found in traditional pixel circuits.

[0092] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 5 The first switching circuit of this application includes a second switching transistor M2, a third switching transistor M3, and a storage capacitor Cst.

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

[0094] With the second switch M2 and the third switch M3 turned on, the power supply voltage at the power supply terminal initializes the first switch.

[0095] Specifically, when the second switch M2 and the third switch 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 is initialized by the power supply voltage at the power supply terminal, thus preparing the drive circuit and ensuring its stable operation in subsequent operations.

[0096] The specific work steps are as follows:

[0097] Switching control signals: Upon receiving control signals from the first and second signal terminals, the second and third switching transistors are simultaneously turned on. At this time, the source of the second switching transistor is connected to the source of the third switching transistor, allowing current to flow smoothly through the switching transistors.

[0098] Storage capacitor charging: When the second switch is turned on, its drain is connected to the first terminal of the storage capacitor, and the storage capacitor begins to charge, storing the charge to provide the necessary voltage for subsequent operations.

[0099] Power initialization: Simultaneously, the third switch is also in the conducting state, with its drain connected to the power supply terminal, allowing the power supply voltage to be effectively transferred to the first switch. After storage and transfer through the storage capacitor, the first switch receives sufficient control voltage for initialization.

[0100] Stable circuit operation: After initialization, the switching circuit operates stably, ensuring that subsequent signals can be effectively transmitted to the driving circuit and the light-emitting circuit. The system remains stable under different operating conditions, reducing power consumption and improving signal transmission efficiency.

[0101] In this embodiment, the switching circuit has been optimized to achieve higher stability and reliability. Furthermore, the design of the storage capacitor effectively reduces unnecessary power consumption caused by signal transmission delay. The overall circuit exhibits improvements in power initialization, current stability, and operational response speed, contributing to a high-quality display effect.

[0102] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 6 The second switching circuit 12 of this application includes a fourth switching transistor M4 and a fifth switching transistor M5.

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

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

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

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

[0107] After the data is written, the first switching transistor determines its state according to the input voltage level, thus preparing for the subsequent light emission process.

[0108] Light emission control process:

[0109] When the control signal of the fifth switch (from the fourth signal terminal) receives a high-level signal, it will turn on. At this time, the first switch will transfer current to the light-emitting circuit according to the previously written data 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 and the correctness of the input signal combine to make the light-emitting circuit light up when the conditions are met, thereby realizing the light response effect of the pixel.

[0110] In this embodiment, efficient and precise data writing and light emission control are achieved through the coordinated operation of two switching transistors. This helps ensure that the pixels maintain their expected performance even under voltage fluctuations or signal interference.

[0111] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 7 The light-emitting circuit of this application includes an organic light-emitting diode (OLED), the anode of which is connected to the source of a fifth switch M5. The OLED emits light when the first switch M1, the third switch M3, and the fifth switch 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 switching transistor.

[0114] The fifth switch: 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 is responsible for regulating the conduction state of the OLED.

[0115] First switching transistor: connected to the first switching circuit, responsible for providing power to the light-emitting circuit.

[0116] The third switching transistor is used to control the grounding state of the OLED and shares the same grounding wire with the light-emitting circuit.

[0117] The operating states of the light-emitting circuit are as follows:

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

[0119] Conduction control: In order for the OLED to emit light, the first, third and fifth switching transistors must be turned on simultaneously.

[0120] The control signals are implemented as follows:

[0121] The first switching transistor is turned on: providing a constant power supply to the light-emitting circuit to ensure the normal operation of the organic light-emitting diode.

[0122] The third switch is turned on: grounding is used to form a complete circuit loop, allowing current to flow effectively.

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

[0124] Light emission: When all three switching transistors are in the ON state, current flows through the OLED, exciting its organic materials and emitting visible light. The OLED's brightness and color output can be precisely controlled based on the power supply voltage and the actual current flowing through it.

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

[0126] This application's embodiments achieve efficient driving of organic light-emitting diodes (OLEDs) through the rational design and control of the switching transistors. By precisely controlling the states of multiple switching transistors, the common problems of insufficient current and voltage fluctuations in display devices are solved.

[0127] In one embodiment, this application also 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 consists of several pixel units, each of which includes the aforementioned pixel circuit. Each pixel circuit can independently control its light emission state to form a complete image display.

[0130] Control Circuit: The control circuit is responsible for generating control signals and sending them to the first, second, and third switches in each pixel circuit to ensure precise control of each pixel unit. The control circuit can adjust the brightness and color of each pixel in real time based on the input image data.

[0131] Data Input Terminal: The data input terminal is used to receive image data from an external graphics processor (GPU) or other video source. This data is transmitted via data lines to the data writing terminals in each pixel circuit, enabling dynamic control of the pixels.

[0132] The pixel circuit control method provided in this application embodiment can be applied to, for example... Figure 8 In the application environment shown, control terminal 01 inputs a first control signal to the switching circuit 1 of the pixel circuit. This first control signal is used to control the switching circuit 1 to initialize the driving circuit of the pixel circuit. It also inputs a second control signal to the switching circuit 1, which controls the switching circuit 1 to form the gate-source voltage difference of the driving circuit 2. Finally, it inputs a third control signal to the switching circuit 1, which controls the switching circuit 1 to write data to the driving circuit 2. Finally, it inputs a fourth control signal to the switching circuit 1, which controls the driving circuit 2 to drive the light-emitting circuit 3 of the pixel circuit to emit light. The control terminal can be a control chip, microcontroller, etc., integrated into the terminal.

[0133] In one embodiment, such as Figure 9 As shown, a control method for a pixel circuit is provided, which is applied to... Figure 8 Taking the control terminal in the middle as an example, the following steps are included:

[0134] S201, input the first control signal to the switching circuit of the pixel circuit.

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

[0136] In this embodiment, the control terminal inputs a first control signal to the switching circuit of the pixel circuit. This signal controls the switching circuit to initialize the driving circuit of the pixel circuit, ensuring the circuit is in a safe initial state. During initialization, all switches are set to the off state to prevent accidental current flow and ensure the safety of circuit components.

[0137] S202, inputs the second control signal to the switching circuit.

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

[0139] In this embodiment, the control terminal inputs a second control signal to the switching circuit. The purpose of this signal is to control the switching circuit to form the gate-source voltage difference (Vgs) of the driving circuit. At this stage, the driving circuit is activated by adjusting the voltage difference between the gate and source, ensuring its operational capability. This precise control of the voltage difference effectively improves the accuracy of subsequent data readings.

[0140] S203, inputs a third control signal to the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0141] In this embodiment, after the differential pressure is established, a third control signal is input to the switching circuit. This signal is used to control the switching circuit to write data to the driving circuit. In this step, the driving signal is transmitted to the pixel circuit through the first switching transistor, and the corresponding voltage level is written to the pixel according to the designed image data, ensuring that each pixel can correctly receive its required excitation signal.

[0142] S204, inputs a fourth control signal to the switching circuit. 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 this embodiment, the control terminal inputs a fourth control signal to the switching circuit. This signal is used to control the driving circuit to drive the light-emitting circuit of the pixel circuit to emit light. At this stage, after all the above steps are successfully completed, the driving circuit converts the collected data into current, driving the OLED to emit light to achieve the desired display effect. Proper signal control and driving capability ensure that the brightness and color of the pixels reach their optimal state.

[0144] The precise control of signals at each step in this embodiment ensures rapid pixel response and stable output, improving display clarity and color reproduction. Initialization and gate-source voltage difference control significantly reduce the risk of circuit damage due to excessive current, guaranteeing the reliability of the system during long-term operation. This method, through standardized control steps, achieves efficient data input and light emission control, simplifying the operation process and improving system usability.

[0145] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 10 The method of this application also includes:

[0146] S301, obtain the subthreshold current value of the first switching transistor.

[0147] In this embodiment, the output current of the first switching transistor is monitored in real time by a data acquisition module in the control circuit. Based on specific time intervals and voltage, the subthreshold current value is recorded by feedback on the switching transistor's state. The acquired subthreshold current value is stored in a microcontroller (MCU) or a corresponding data memory for use in subsequent steps.

[0148] S302 determines the minute current difference based on the subthreshold current value and the theoretical current value. This minute current difference is used to compensate for the subthreshold current deviation.

[0149] Theoretical current value: The theoretical current value is calculated based on the operating conditions and requirements of the display device. This value is usually determined based on the design specifications and expected output.

[0150] Calculate the small current difference: The small current difference is calculated by comparing the obtained subthreshold current value with the theoretical current value.

[0151] The formula for calculating minute current difference is: minute current difference = theoretical current value - subthreshold current value.

[0152] Compensation Mechanism: This minute current difference can be used to adjust subsequent control signals to compensate for insufficient current caused by subthreshold current deviation, thereby ensuring optimal OLED illumination. Compensation can be achieved by dynamically adjusting the on-time or voltage amplitude of the first switching transistor.

[0153] In this embodiment, by real-time monitoring and compensation of the subthreshold current, the control precision of the first switching transistor is improved, thereby ensuring that the OLED can emit light stably in all operating states. By reducing brightness fluctuations caused by current deviations, the consistency of display effects is improved, enhancing the user's visual experience.

[0154] In one exemplary embodiment, based on the above embodiments, please refer to... Figure 11 The method of this application also includes the following steps:

[0155] S401, obtain the voltage value of the first switching transistor.

[0156] In this embodiment, the control terminal first needs to obtain the operating voltage value of the first switching transistor (typically used as a switching element in the drive circuit). This can be achieved by using a built-in voltage sensor to measure the voltage across the switching transistor, thereby obtaining the real-time voltage status.

[0157] S402 determines the minute voltage difference based on the voltage value and the theoretical voltage value. This minute voltage difference is used to compensate for voltage fluctuations.

[0158] In this embodiment, the acquired voltage value is compared with a pre-set theoretical voltage value. If a difference is found, the control terminal calculates this voltage difference, which is called the minute voltage difference. This information is used to dynamically adjust the voltage and improve the stability of the system under fluctuating conditions. The minute voltage difference can be detected by increasing the compensation time according to formula (1):

[0159] (1)

[0160] In one exemplary embodiment, based on the above embodiments, the method of this application further includes:

[0161] The current of the light-emitting circuit is determined based on the unit area capacitance, mobility, aspect ratio, data voltage, the small voltage difference of the first switching transistor in the driving circuit, and the source voltage of the first switching transistor.

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

[0163] Mobility (μ): Mobility refers to the ability of charge carriers to migrate under the influence of an electric field. This value is usually obtained experimentally or by looking up material properties.

[0164] Width-to-length ratio (W / L): This ratio is the proportion of the width (W) to the length (L) of the switching transistor, and it can affect the switching transistor's conduction capability.

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

[0166] Minimal voltage difference (ΔVsub): Determine the minimal voltage difference of the first switching transistor based on the minimal current difference calculated in step S302.

[0167] Source voltage (Vsource): Record the source voltage value of the first switching transistor in the driving circuit. Using the following formula (2), determine the current of the light-emitting circuit by combining the above parameters:

[0168] (2)

[0169] like Figure 12As shown, the circuit operates in the following state during stage T1:

[0170] (1) When S2 and EM1 are set high, ELVDD is initialized by writing to the gate of DTFT (M1) through M4 and M3.

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

[0172] Phase T2.

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

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

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

[0176] ELVDD enables the OLED to 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 this application, the current changes from 204.4nA to 201.8nA, with an intra-frame current change of 2.6nA and a gate voltage change of 0.009V. The new 5T1C circuit stabilizes the current during the light-emitting stage, solving the OLED current fluctuation caused by the offset of SS and VTH of DTFT, and enhancing the image quality of AMOLED displays.

[0179] In this embodiment, by monitoring and compensating for the voltage of the switching transistor in real time, the display device can maintain a steady state under different operating conditions, avoiding image flickering or uneven color. Precise voltage control combined with the compensation mechanism helps improve pixel response speed and brightness output.

[0180] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0181] Based on the same inventive concept, this application also provides a pixel circuit control device for implementing the pixel circuit control method described above. The solution provided by this device is similar to the implementation described in the above method; therefore, the specific limitations in one or more pixel circuit control device embodiments provided below can be found in the limitations of the pixel circuit control method described above, and will not be repeated here.

[0182] In one embodiment, such as Figure 13 As shown, a pixel circuit control device 500 is provided, comprising:

[0183] The first control module 501 is used to input a first control signal to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit.

[0184] The second control module 502 is used to input a second control signal to the switching circuit. The second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit.

[0185] The third control module 503 is used to input a third control signal to the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0186] The fourth control module 504 is used to input a fourth control signal to the switching circuit. 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-mentioned apparatus further includes:

[0188] The current value acquisition module is used to acquire the subthreshold current value of the first switching transistor;

[0189] The current difference determination module is used to determine the minute current difference based on the subthreshold current value and the theoretical current value; the minute current difference is used to compensate for the subthreshold current deviation.

[0190] In one embodiment, the above-mentioned apparatus further includes:

[0191] The first voltage acquisition module is used to acquire the voltage value of the first switching transistor;

[0192] The voltage difference determination module is used to determine the minute voltage difference based on the voltage value and the theoretical voltage value. This minute voltage difference is used to compensate for voltage fluctuations.

[0193] In one embodiment, the above-described apparatus further includes:

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

[0195] Each module in the aforementioned pixel circuit control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in hardware within or independently of the processor in a computer device, or stored in software within the memory of the computer device, so that the processor can call and execute the operations corresponding to each module.

[0196] In one embodiment, a control terminal is provided, including a memory chip and a processing chip. The memory chip stores a computer program, and the processing chip executes the computer program to perform the following steps:

[0197] A first control signal is input to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit.

[0198] A second control signal is input to the switching circuit. The second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit.

[0199] A third control signal is input to the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0200] A fourth control signal is input to the switching circuit. 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, when the processing chip executes a computer program, the following steps are also performed:

[0202] Obtain the subthreshold current value of the first switching transistor;

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

[0204] In one embodiment, when the processing chip executes a computer program, the following steps are also performed:

[0205] Obtain the voltage value of the first switching transistor;

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

[0207] In one embodiment, when the processing chip executes a computer program, the following steps are also performed:

[0208] The current of the light-emitting circuit is determined based on the unit area capacitance, mobility, aspect ratio, data voltage, the small voltage difference of the first switching transistor in the driving circuit, and the source voltage of the first switching transistor.

[0209] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0210] A first control signal is input to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit.

[0211] A second control signal is input to the switching circuit. The second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit.

[0212] A third control signal is input to the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0213] A fourth control signal is input to the switching circuit. 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, it also performs the following steps:

[0215] Obtain the subthreshold current value of the first switching transistor;

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

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

[0218] Obtain the voltage value of the first switching transistor;

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

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

[0221] The current of the light-emitting circuit is determined based on the unit area capacitance, mobility, aspect ratio, data voltage, the small voltage difference of the first switching transistor in the driving circuit, and the source voltage of the first switching transistor.

[0222] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0223] A first control signal is input to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit.

[0224] A second control signal is input to the switching circuit. The second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit.

[0225] A third control signal is input to the switching circuit. The third control signal is used to control the switching circuit to write data to the drive circuit.

[0226] A fourth control signal is input to the switching circuit. 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, it also performs the following steps:

[0228] Obtain the subthreshold current value of the first switching transistor;

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

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

[0231] Obtain the voltage value of the first switching transistor;

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

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

[0234] The current of the light-emitting circuit is determined based on the unit area capacitance, mobility, aspect ratio, data voltage, the small voltage difference of the first switching transistor in the driving circuit, and the source voltage of the first switching transistor.

[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, data stored, data displayed, 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 related data must comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0236] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media 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), magnetic 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. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0237] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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 embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A pixel circuit, characterized in that, The pixel circuit includes a switching circuit, a driving circuit, and a light-emitting circuit; the switching circuit is used to initialize the driving circuit and to connect the driving 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 to emit light under the drive of the driving circuit. The switching circuit includes a first switching circuit and a second switching circuit, and the driving circuit includes a first switching transistor. The source of the first switching transistor is connected to the light-emitting circuit. The first switching transistor is used to drive the light-emitting circuit when it is turned on, and to compensate for the subthreshold current deviation according to a received first control signal when the current of the light-emitting circuit is lower than a preset current value; and to compensate for the voltage fluctuation according to a received second control signal when the power supply voltage is lower than a preset voltage value. The subthreshold current deviation is compensated based on a small current difference, which is the difference between the theoretical current value and the subthreshold current value of the first switching transistor. The voltage fluctuation is compensated based on a small voltage difference, which is the difference between the theoretical voltage difference and the voltage value of the first switching transistor. The first switching circuit includes a second switching transistor, a third switching transistor, and a storage capacitor. The control terminal of the second switching transistor is connected to a first signal terminal, the source terminal of the second switching transistor is connected to the source terminal of the third switching transistor, and the drain terminal of the second switching transistor is connected to the first terminal of the storage capacitor and the control terminal of the first switching transistor. The second terminal of the storage capacitor is connected to the drain terminal of the third switching transistor. The control terminal of the third switching transistor is connected to a second signal terminal, the source terminal of the third switching transistor is also connected to the drain terminal of the first switching transistor, and the drain terminal of the third switching transistor is connected to a power supply terminal. When the circuit is on, the power supply voltage at the power supply terminal initializes the first switching transistor; the second switching circuit includes a fourth switching transistor and a fifth switching transistor; the control electrode of the fourth switching transistor is connected to the third signal terminal, the drain of the fourth switching transistor is connected to the source of the first switching transistor and the drain of the fifth switching transistor, and the source of the fourth switching transistor is connected to the data writing terminal; the control electrode of the fifth switching transistor is connected to the fourth signal terminal, and the source of the fifth switching transistor is connected to the light-emitting circuit; when the fourth switching transistor is on, the data voltage at the data writing terminal writes data to the first switching transistor; When the fifth switch is turned on, the first switch drives the light-emitting circuit to emit light.

2. The pixel circuit of claim 1, wherein, The light-emitting circuit includes an organic light-emitting diode, and the anode of the organic light-emitting diode is connected to the source of the fifth switching transistor; The organic light-emitting diode emits light when the first switch, the third switch, and the fifth switch are turned on.

3. A display device, characterized by comprising: The display device includes the pixel circuitry as described in claim 1 or 2.

4. A method for controlling a pixel circuit, characterized in that, Applied to the pixel circuit as described in claim 1 or 2, the method includes: A first control signal is input to the switching circuit of the pixel circuit. The first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit. A second control signal is input to the switching circuit, the second control signal being used to control the switching circuit to form the gate-source voltage difference of the driving circuit; A third control signal is input to the switching circuit, and the third control signal is used to control the switching circuit to write data to the driving circuit. A fourth control signal is input to the switching 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.

5. The method of claim 4, wherein, The method further includes: Obtain the subthreshold current value of the first switching transistor in the driving circuit; Based on the subthreshold current value and the theoretical current value, a small current difference is determined; the small current difference is used to compensate for the subthreshold current deviation.

6. The method of claim 4, wherein, The method further includes: Obtain the voltage value of the first switching transistor in the driving circuit; Based on the voltage value and the theoretical voltage value, a small voltage difference is determined, which is used to compensate for voltage fluctuations.

7. The method of claim 4, wherein, The method further includes: The current of the light-emitting circuit is determined based on the unit area capacitance, mobility, aspect ratio, data voltage, the small voltage difference of the first switching transistor in the driving circuit, and the source voltage of the first switching transistor.

8. A control device of a pixel circuit, characterized by comprising: The device, applied to the pixel circuit as described in claim 1 or 2, comprises: The first control module is used to input a first control signal to the switching circuit of the pixel circuit, and the first control signal is used to control the switching circuit to initialize the driving circuit of the pixel circuit. The second control module is used to input a second control signal to the switching circuit, and the second control signal is used to control the switching circuit to form the gate-source voltage difference of the driving circuit. The third control module is used to input a third control signal to the switching circuit, and the third control signal is used to control the switching circuit to write data to the driving circuit. The fourth control module is used to input a fourth control signal to the switching 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.

9. The apparatus of claim 8, wherein, The device further includes: The current value acquisition module is used to acquire the subthreshold current value of the first switching transistor; The current difference determination module is used to determine the minute current difference based on the subthreshold current value and the theoretical current value; the minute current difference is used to compensate for the subthreshold current deviation.

10. A computer program product comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 4 to 7.

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