Pixel compensation circuit and method, display device

Abstract

Provided are a pixel compensation circuit and method and a display device, which belong to the technical field of display. In the pixel compensation circuit, the sensing circuit can sense and output an electrical signal reflecting the temperature of the light-emitting device, the sampling circuit can sample and output a real-time driving signal of the pixel circuit output to the light-emitting device when it is determined that the temperature is abnormal based on the electrical signal, and the compensation circuit can compensate a data signal based on the real-time driving signal. Therefore, the purpose of compensating the light-emitting driving signal output by the pixel circuit to the light-emitting device based on the data signal can be achieved, the influence of the temperature abnormality on the light-emitting driving signal can be avoided, and thus the normal light emission of the light-emitting device can be ensured, so that the display effect of the display panel is better.

Description

Technical Field

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

[0002] Organic light-emitting diodes (OLEDs), as a new generation of display devices, are finding increasingly wider applications in display, lighting, and information technology (IT) fields. Display panels incorporating OLEDs are also called OLED display panels.

[0003] In related technologies, an OLED display panel generally includes a substrate and multiple pixels located on the substrate. Each pixel includes pixel circuitry and a light-emitting device (i.e., OLED). The pixel circuitry includes a data writing transistor and a driving transistor. The data writing transistor is used to output a data signal to the driving transistor; the driving transistor is used to output a driving current to the light-emitting device based on the data signal, so as to drive the light-emitting device to emit light.

[0004] However, tests revealed that as the temperature of the light-emitting device increases, the characteristics of the transistor vary greatly at different temperatures. This can cause abnormal driving current output from the pixel circuit to the light-emitting device, which in turn leads to abnormal light emission from the light-emitting device and results in poor display performance of the display panel. Summary of the Invention

[0005] A pixel compensation circuit and method, and a display device, are provided to solve the problem of poor display effect of the display panel caused by abnormal temperature in related technologies. The technical solution is as follows:

[0006] On one hand, a pixel compensation circuit is provided for compensating the light-emitting driving signal transmitted from the pixel circuit to the light-emitting device based on the data signal provided by the data terminal; the pixel compensation circuit includes: a sensing circuit, a sampling circuit and a compensation circuit, the sensing circuit is located on one side of the light-emitting device and connected to the sampling circuit, the sampling circuit is also connected to the compensation circuit and is used to connect to the light-emitting device, and the compensation circuit is also connected to the data terminal;

[0007] The sensing circuit is used to: sense the device temperature of the light-emitting device, and output a target electrical signal reflecting the device temperature based on the device temperature;

[0008] The sampling circuit is used to: sample and output the real-time driving signal transmitted from the pixel circuit to the light-emitting device when the target electrical signal does not meet the electrical signal reference value, wherein the electrical signal reference value is an electrical signal reflecting the device temperature of the light-emitting device when the light-emitting device emits normal brightness;

[0009] The compensation circuit is used to: compensate the data signal provided by the data terminal based on the real-time driving signal, so as to compensate the light-emitting driving signal transmitted by the pixel circuit to the light-emitting device.

[0010] Optionally, both the real-time driving signal and the light-emitting driving signal are driving currents flowing through the light-emitting device, and the pixel circuit is used to generate the driving current based on the data signal; the compensation circuit is used for:

[0011] The real-time drive current output by the sampling circuit and the real-time luminous intensity of the light-emitting device under the drive of the real-time drive current are input into the training model to obtain the feedback voltage.

[0012] The feedback voltage is used to compensate for the voltage of the data signal;

[0013] The training model is a model trained based on a sample set, which includes multiple input parameters and multiple output parameters that are one-to-one. Each input parameter includes the actual driving current flowing through the light-emitting device and the actual luminous brightness of the light-emitting device under the driving current. Each output parameter includes the feedback voltage required to generate the actual driving current. The multiple input parameters and multiple output parameters are parameters of the light-emitting device changing over time at a fixed brightness in multiple different display panels.

[0014] Optionally, the pixel circuit is further configured to drive the light-emitting device to emit light based on the light-emitting control signal provided by the light-emitting control terminal; the sensing circuit is also connected to the light-emitting control terminal.

[0015] Furthermore, the sensing circuit is configured to: sense the device temperature of the light-emitting device in response to the light-emitting control signal, and output a target electrical signal reflecting the device temperature based on the device temperature.

[0016] Optionally, the sensing circuit includes: a sensing unit and a reading unit; the sensing unit is located on one side of the light-emitting device and is connected to the light-emitting control terminal and the reading unit respectively, and the reading unit is also connected to the power supply terminal, the light-emitting control terminal and the sampling circuit respectively;

[0017] The sensing unit is used to: sense the device temperature of the light-emitting device in response to the light-emitting control signal, and output a control electrical signal based on the device temperature;

[0018] The reading unit is used to: respond to the light emission control signal and the control electrical signal, and output the target electrical signal based on the power signal provided by the power supply terminal.

[0019] Optionally, the pixel circuit and the light-emitting device are located on one side of the substrate and are stacked sequentially in a direction away from the substrate;

[0020] The sensing unit includes: a first electrode, a thermistor material layer, and a second electrode, which are located between the pixel circuit and the light-emitting device and are stacked sequentially in the direction close to the light-emitting device, wherein the first electrode is connected to the light-emitting control terminal and the second electrode is connected to the reading unit.

[0021] Optionally, the reading unit is integrated with the pixel circuit;

[0022] The sampling circuit and the compensation circuit are integrated on a processing chip independent of the substrate, and the second electrode in the sensing unit is connected to the processing chip through a flexible circuit board.

[0023] Optionally, the reading unit includes: a first switch section and a second switch section;

[0024] The first switch is connected to the sensing unit, the power supply terminal and the second switch, and the second switch is also connected to the light emission control terminal and the sampling circuit.

[0025] The first switch is used to: control the connection and disconnection between the power supply terminal and the second switch in response to the reference electrical signal;

[0026] The second switch is used to: control the on / off state of the first switch and the sampling circuit in response to the light emission control signal, and output the target electrical signal.

[0027] Optionally, the first switching part includes a first transistor; the second switching part includes a second transistor; and the first transistor and the second transistor are of different types.

[0028] The gate of the first transistor is connected to the sensing unit, the first electrode of the first transistor is connected to the power supply terminal, the second electrode of the first transistor is connected to the first electrode of the second transistor, the gate of the second transistor is connected to the light emission control terminal, and the second electrode of the second transistor is connected to the sampling circuit.

[0029] Optionally, the sampling circuit includes: a comparison unit and a sampling unit; the comparison unit is connected to a reference terminal, the sensing circuit and the sampling unit respectively, the sampling unit is also connected to the compensation circuit and is used to connect to the light-emitting device, and the reference terminal is used to provide the electrical signal reference value;

[0030] The comparison unit is used to: compare the target electrical signal with the electrical signal reference value, and output a sampling enable signal when it is determined that the target electrical signal is greater than the electrical signal reference value;

[0031] The sampling unit is used to: in response to the sampling enable signal, sample and output the real-time driving signal transmitted by the pixel circuit to the light-emitting device.

[0032] Optionally, the comparison unit includes: a comparator, a first resistor, and a second resistor;

[0033] Of the positive and negative input terminals of the comparator, one input terminal is connected to the sensing circuit through the first resistor, and the other input terminal is connected to the reference terminal through the second resistor. The output terminal of the comparator is connected to the sampling unit.

[0034] Optionally, the sampling unit includes: an amplifier, a capacitor, and a switch;

[0035] The positive input terminal of the amplifier is used to connect to the light-emitting device, the negative input terminal of the amplifier is grounded, and the output terminal of the amplifier is connected to the compensation circuit.

[0036] The capacitor is connected between the positive and negative input terminals of the amplifier.

[0037] The switch is connected between the positive and negative input terminals of the amplifier and is also connected to the comparator unit.

[0038] Optionally, the real-time drive signal output from the amplifier is an analog signal, and the signal processed by the compensation circuit is a digital signal.

[0039] The sampling unit further includes an analog-to-digital converter connected between the output of the amplifier and the compensation circuit. The analog-to-digital converter is used to convert the real-time drive signal in analog form output by the amplifier into a digital signal and then output it to the compensation circuit.

[0040] Optionally, the sampling unit includes: a controller and at least one sampling transistor;

[0041] The controller is connected to the comparison unit, the at least one sampling transistor is connected to the scan switch terminal and the sensing line respectively, and is also used to connect to the light-emitting device, the scan switch terminal is connected to the controller, and the sensing line is connected to the compensation circuit.

[0042] On the other hand, a pixel compensation method is provided for compensating the light-emitting driving signal transmitted from the pixel circuit to the light-emitting device based on the data signal provided by the data terminal, and is applied in the pixel compensation circuit as described in the above aspect; the method includes:

[0043] The sensor circuit in the pixel compensation circuit senses the device temperature of the light-emitting device, and the sensor circuit outputs a target electrical signal reflecting the device temperature based on the device temperature.

[0044] When the target electrical signal does not meet the electrical signal reference value, the sampling circuit in the pixel compensation circuit samples and outputs the real-time driving signal transmitted from the pixel circuit to the light-emitting device. The electrical signal reference value is the electrical signal that reflects the device temperature of the light-emitting device when the light-emitting device emits normal brightness.

[0045] The compensation circuit in the pixel compensation circuit compensates the data signal provided by the data terminal based on the real-time driving signal, so as to compensate the light-emitting driving signal transmitted by the pixel circuit to the light-emitting device.

[0046] In another aspect, a display device is provided, the display device comprising: a display panel, pixel circuitry and light-emitting devices located on the display panel, and a pixel compensation circuit as described in the preceding aspect;

[0047] The pixel circuit is used to transmit a light-emitting driving signal to the light-emitting device based on the data signal provided by the data terminal;

[0048] The pixel compensation circuit is used to compensate for the effect of temperature on the light emission driving signal.

[0049] In summary, the beneficial effects of the technical solutions provided in this application embodiment can include at least the following:

[0050] A pixel compensation circuit, method, and display device are provided. In this pixel compensation circuit, the sensing circuit can sense and output an electrical signal reflecting the temperature of the light-emitting device; the sampling circuit can sample and output the real-time driving signal from the pixel circuit to the light-emitting device when a temperature anomaly is determined based on the electrical signal; and the compensation circuit can compensate the data signal based on the real-time driving signal. Therefore, it can compensate the light-emitting driving signal output by the pixel circuit to the light-emitting device based on the data signal, avoiding the influence of temperature anomalies on the light-emitting driving signal, thereby ensuring normal light emission of the light-emitting device and resulting in a better display effect on the display panel. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of a pixel compensation circuit provided in an embodiment of this application;

[0053] Figure 2 This is a schematic diagram of another pixel compensation circuit provided in an embodiment of this application;

[0054] Figure 3 This is a schematic diagram of another pixel compensation circuit provided in the embodiments of this application;

[0055] Figure 4 This is a schematic diagram of another pixel compensation circuit provided in an embodiment of this application;

[0056] Figure 5 This is a schematic diagram of the film structure of a pixel compensation circuit provided in an embodiment of this application;

[0057] Figure 6 This is a schematic diagram of the film structure of a sensing unit provided in an embodiment of this application;

[0058] Figure 7 This is a schematic diagram of the structure of a reading unit provided in an embodiment of this application;

[0059] Figure 8 This is a schematic diagram of the circuit structure of a reading unit provided in an embodiment of this application;

[0060] Figure 9 This is a schematic diagram of the circuit structure of a comparison unit provided in an embodiment of this application;

[0061] Figure 10 This is a schematic diagram of the circuit structure of a sampling unit provided in an embodiment of this application;

[0062] Figure 11 This is a schematic diagram illustrating the relationship between luminous intensity and luminous current provided in an embodiment of this application;

[0063] Figure 12 This is a schematic diagram of the circuit structure of another sampling unit provided in an embodiment of this application;

[0064] Figure 13 Is Figure 12 A timing diagram illustrating the operation of a circuit is shown below.

[0065] Figure 14 This is a schematic flowchart of a pixel compensation method provided in an embodiment of this application;

[0066] Figure 15 This is a schematic diagram of the working process of a compensation circuit provided in an embodiment of this application;

[0067] Figure 16 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0069] It should be noted that the transistors used in the embodiments of this application can all be thin film transistors (TFTs), field-effect transistors (FETs), or other devices with similar characteristics. FETs can be, for example, metal-oxide-semiconductor (MOS) FETs, also known as MOS transistors. Furthermore, based on their function in the circuit, the transistors used in the embodiments of this application are mainly switching transistors. In the embodiments of this application, the source can be referred to as the first electrode, and the drain as the second electrode. According to the configuration shown in the drawings, the middle terminal of the transistor is the control electrode, also known as the gate; the signal input terminal is the source, and the signal output terminal is the drain. In addition, the switching transistors used in the embodiments of this application can include any of P-type transistors and N-type transistors. P-type transistors conduct when the gate is at a low potential and are cut off when the gate is at a high potential; N-type transistors conduct when the gate is at a high potential and are cut off when the gate is at a low potential. Furthermore, multiple signals in the various embodiments of this application correspond to a first potential and a second potential. The first potential and the second potential only represent that the potential of the signal has two state quantities, and do not mean that the first potential or the second potential has a specific value in the whole text.

[0070] With the continuous advancement of small- and medium-sized OLED technology development and industrial applications, as well as ongoing research into large-size technology and integration processes, higher demands are being placed on OLED products in terms of display bezels, refresh rates, power consumption, and display quality. Currently, the backplane driving circuits in OLED display panels on the market mainly use LTPS and LTPO backplane driving circuits. LTPS refers to circuits made of low-temperature polycrystalline silicon (LTPS) material; LTPO refers to circuits made of low-temperature polycrystalline oxide (LTPO) material. Here, it refers to the transistors in the circuit, where the active layer material can be either LTPS or LTPO. However, considering the high power consumption and large leakage current of LTPS backplane driving circuits, and the limitations of LTPO backplane driving circuits in terms of flicker and variable refresh rate (VRR), all-Oxide backplane driving technology is beginning to be adopted for circuit layout. All-Oxide means that the transistors in the circuit are made of oxide material.

[0071] However, research conducted during the full Oxide backplane driving technology verification project revealed that when an OLED display panel is displayed under high brightness and high grayscale conditions for an extended period, the overall panel temperature rises. Furthermore, as the temperature increases, the display brightness under these high grayscale conditions also becomes abnormal, such as an increase in overall brightness. High brightness is, for example, a brightness greater than or equal to 500 nits. After technical and process analysis, it was found that this phenomenon is primarily due to significant differences in the characteristics of transistors within the pixel circuitry of the display panel at different temperatures. This leads to abnormalities in the driving current (also known as the luminous current) transmitted to the OLED light-emitting device, resulting in abnormal brightness and thus abnormal display. Transistor characteristics include, for example, threshold voltage and / or mobility. Based on this, embodiments of this application provide a pixel compensation circuit that can compensate for the influence of temperature on the luminous current, solving the problem of abnormal brightness increases caused by temperature rise.

[0072] Figure 1 This is a schematic diagram of a pixel compensation circuit provided in an embodiment of this application. This pixel compensation circuit can be used to compensate for the light-emitting drive signal transmitted from the pixel circuit P1 to the light-emitting device L1 based on the data signal provided by the data terminal Vdata.

[0073] For example, the light-emitting device L1 can be an OLED, and reference Figure 1The pixel circuit P1 can be connected to the pull-up power supply terminal ELVDD, the data terminal Vdata, and the anode of the light-emitting device L1, respectively. The cathode of the light-emitting device L1 can be connected to the pull-down power supply terminal ELVSS. The pixel circuit P1 can output a light-emitting drive signal to the light-emitting device L1 based on the power signal provided by the pull-up power supply terminal ELVDD and the data signal provided by the data terminal Vdata. The light-emitting device L1 emits light based on the light-emitting drive signal and the power signal provided by the pull-down power supply terminal ELVSS. The structure including the pixel circuit P1 and the light-emitting device L1 can also be called a pixel. A display panel can generally include multiple pixels.

[0074] It is understandable that the light-emitting driving signal can be the driving current described above. Due to temperature effects, the driving current transmitted from the pixel circuit P1 to the light-emitting device L1 may become abnormal, which in turn will cause abnormal light emission from the light-emitting device L1, ultimately resulting in abnormal display brightness of the display panel and affecting the display effect.

[0075] Continue to refer to Figure 1 The pixel compensation circuit 00 described in this application embodiment includes: a sensing circuit 01, a sampling circuit 02, and a compensation circuit 03.

[0076] Sensing circuit 01 is located on one side of light-emitting device L1 and connected to sampling circuit 02. Sampling circuit 02 is also connected to compensation circuit 03 and used for connection to light-emitting device L1. Compensation circuit 03 is also connected to data terminal Vdata. Optionally, sampling circuit 02 can be connected to the anode of light-emitting device L1. It is understood that... Figure 1 The positional relationship between the sensing circuit 01 and the light-emitting device L1 is not shown.

[0077] The sensing circuit 01 is used to: sense the device temperature of the light-emitting device L1, and output a target electrical signal reflecting the device temperature based on the device temperature.

[0078] For example, the sensing circuit 01 may include a temperature sensing device to sense the device temperature of the light-emitting device L1 and output a current signal that is positively correlated with the device temperature. That is, the target electrical signal can be a current signal, and the higher the device temperature, the greater the current value, and the lower the device temperature, the smaller the current value. In this way, the temperature of the display panel at different points in time can be distinguished.

[0079] The sampling circuit 02 is used to sample and output the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1 when the target electrical signal does not meet the electrical signal reference value.

[0080] For example, after receiving the target electrical signal reflecting the device temperature output by the sensing circuit 01, the sampling circuit 02 can determine whether the target electrical signal meets the electrical signal reference value by comparing the magnitude of the target electrical signal and the electrical signal reference value. If it is determined that the target electrical signal does not meet the electrical signal reference value, the sampling circuit 02 can sample the real-time driving signal transmitted from the pixel circuit P1 to the light-emitting device L1, such as sampling the real-time driving current used to drive the light-emitting device L1 to emit light, that is, the driving current flowing through the light-emitting device L1.

[0081] The reference value for the electrical signal is an electrical signal reflecting the device temperature of the light-emitting device L1 when it emits normal brightness. That is, the reference value can be the electrical signal output by the sensing circuit 01 at the device temperature when the light-emitting device L1 emits normal brightness. Furthermore, this reference value can be pre-stored in the sampling circuit 02 for later retrieval. Of course, this reference value can also be flexibly adjusted in real time. Based on this, the sampling circuit 02 can determine that the device temperature is abnormal when the target electrical signal reflecting the device temperature exceeds (i.e., is greater than) the reference value, and then begin sampling the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1. Correspondingly, when the device temperature is normal, the sampling circuit 02 can be inactive. Therefore, the sampling circuit 02 can promptly sample and output the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1 even when the device temperature is high, resulting in low power consumption.

[0082] Of course, in some embodiments, the sampling circuit 02 may only further sample the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1 when the target electrical signal output by the sensing circuit 01 fails to meet the electrical signal reference value in multiple different time periods. This ensures sampling reliability and further reduces power consumption. Alternatively, the sampling circuit 02 may sample the real-time drive signal in real time.

[0083] In some embodiments, the reference value of the electrical signal may also be a range determined at different temperatures. The sampling circuit 02 may determine that the device temperature is abnormal when it determines that the target electrical signal reflecting the device temperature is not within the range and is greater than the upper limit of the range, and start sampling the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1.

[0084] The compensation circuit 03 is used to compensate the data signal provided by the data terminal Vdata based on the real-time drive signal, so as to compensate the light-emitting drive signal transmitted from the pixel circuit P1 to the light-emitting device L1.

[0085] Optionally, after receiving the real-time drive signal output by the sampling circuit 02 when the device temperature is abnormal, the compensation circuit 03 can compensate the voltage of the data signal based on the real-time drive signal to further compensate the light-emitting drive signal output by the pixel circuit P1 to the light-emitting device L1 based on the data signal, thereby avoiding the influence of temperature abnormality on the light-emitting drive signal, and thus reliably driving the light-emitting device L1 to emit light normally.

[0086] In summary, this application provides a pixel compensation circuit. In this pixel compensation circuit, the sensing circuit can sense and output an electrical signal reflecting the temperature of the light-emitting device, and the sampling circuit can sample and output the real-time driving signal from the pixel circuit to the light-emitting device when a temperature anomaly is determined based on this electrical signal. The compensation circuit can compensate the data signal based on this real-time driving signal. Therefore, it can achieve the purpose of compensating the light-emitting driving signal output by the pixel circuit to the light-emitting device based on the data signal, avoiding the influence of temperature anomalies on the light-emitting driving signal, thereby ensuring that the light-emitting device emits light normally, resulting in a better display effect on the display panel.

[0087] Optionally, as described in the above embodiments, whether it is the real-time driving signal acquired by the sampling circuit or the light-emitting driving signal output by the pixel circuit, the driving signal can refer to the driving current flowing through the light-emitting device L1, and the pixel circuit P1 can be used to generate this driving current based on the data signal. Accordingly, the real-time driving signal is also called the real-time driving current, and the light-emitting driving signal is also called the light-emitting driving current. Since both the real-time driving current and the light-emitting driving current are currents used to drive the light-emitting device L1 to emit light, they are also called light-emitting current.

[0088] Based on this, the compensation circuit 03 can be used to: input the real-time drive current output by the sampling circuit 02 and the real-time luminous intensity of the light-emitting device L1 under the drive of the real-time drive current into the training model to obtain the feedback voltage, and then use the feedback voltage to compensate the voltage of the data signal.

[0089] The training model can be a model trained based on a sample set. The sample set can include multiple input parameters and multiple output parameters that correspond one-to-one. Each input parameter can include the actual driving current flowing through the light-emitting device L1 and the actual luminous intensity of the light-emitting device L1 under the drive of the actual driving current. Each output parameter can include the feedback voltage required to generate the actual driving current. The multiple input parameters and multiple output parameters that correspond one-to-one can be parameters of the light-emitting device L1 changing over time at a fixed brightness (or a specific brightness) in multiple different display panels.

[0090] In other words, in this embodiment, the compensation circuit 03 first acquires the actual luminous brightness, luminous current, and required feedback voltage of several (i.e., multiple) display panels under a specific brightness level over time. The actual luminous brightness, luminous current, and feedback voltage serve as a sample set, with the actual luminous brightness and luminous current serving as input parameters and the required feedback voltage as an output parameter. Then, the compensation circuit 03 can train an algorithm on this sample set to establish a functional relationship model between the feedback voltage and the actual luminous brightness and luminous current as a training model.

[0091] Optionally, the algorithm could be a neural network algorithm. Neural network algorithms have self-learning capabilities; by training a sample set using a neural network algorithm, the resulting functional relationship model can acquire self-learning ability. When the actual luminous intensity and luminous current of the display panel are input to the functional relationship model, the corresponding feedback voltage can be calculated through the self-learning capability of the functional relationship model. Furthermore, neural network algorithms also have high-speed solution capabilities; therefore, the aforementioned functional relationship model can quickly solve for the exposure time, thereby improving the calculation speed of the functional relationship model. Of course, it is not limited to neural network algorithms.

[0092] Based on this, the compensation circuit 03 can directly input the real-time drive current and corresponding real-time luminous intensity output by the sampling circuit 02 into the established functional relationship model to quickly and accurately obtain the feedback voltage required for compensation of the current real-time drive current. After obtaining the feedback voltage, the compensation circuit 03 can further use this feedback voltage to compensate the voltage of the data signal, thereby further compensating the luminous drive current output from the pixel circuit P1 to the light-emitting device L1, offsetting the abnormal luminous drive current caused by abnormal temperature rise, and thus maintaining the normal brightness display of the display panel.

[0093] Optionally, the display panels can be of the same model, for example, display panels of the same model produced in the same or different batches. Furthermore, the variation in luminous current caused by the increase in brightness over time of the display panels at a specific brightness level leads to different actual luminous brightness and corresponding feedback voltages. The luminous current and feedback voltage of each display panel at its actual luminous brightness are considered as a sample, and the luminous current and feedback voltage of the display panels at their actual luminous brightness constitute the sample set described in the above embodiment. Additionally, it is understood that the more display panels there are, the more samples are in the sample set, and correspondingly, the more accurate the trained functional relationship model will be.

[0094] Optionally, Figure 2 This is a schematic diagram of another pixel compensation circuit provided in an embodiment of this application. Figure 2As shown, the pixel circuit P1 can also be used to drive the light-emitting device L1 to emit light based on the light-emitting control signal provided by the light-emitting control terminal EM.

[0095] For example, the pixel circuit P1 can generate a light-emitting drive signal when the potential of the light-emitting control signal is a first potential, and can choose not to generate a light-emitting drive signal when the potential of the light-emitting control signal is a second potential. And / or, the pixel circuit P1 can transmit the light-emitting drive signal to the light-emitting device L1 to drive the light-emitting device L1 to emit light when the potential of the light-emitting control signal is a first potential, and can choose not to transmit the light-emitting drive signal to the light-emitting device L1 to not drive the light-emitting device L1 to emit light when the potential of the light-emitting control signal is a second potential.

[0096] Optionally, in the embodiments of this application, the first potential can refer to an effective potential, and the second potential can refer to an ineffective potential. Furthermore, the first potential can be lower than the second potential, meaning the first potential can be low and the second potential can be high. Of course, in some other embodiments, the first potential can also be higher than the second potential. This is related to the type of transistor connected to the light-emitting control terminal EM in the pixel circuit P1.

[0097] Based on this, continue to refer to Figure 2 It can be seen that the sensing circuit 01 can also be connected to the light-emitting control terminal EM. Furthermore, the sensing circuit 01 can be used to: sense the device temperature of the light-emitting device L1 in response to the light-emitting control signal, and output a target electrical signal reflecting the device temperature based on the device temperature.

[0098] For example, in the same pixel circuit P1, the sensing circuit 01 can sense the device temperature of the light-emitting device L1 and output a target electrical signal when the potential of the light-emitting control signal is at the first potential, that is, when the light-emitting device L1 is emitting light. Conversely, when the potential of the light-emitting control signal is at the second potential, that is, when the light-emitting device L1 is not emitting light, the sensing circuit 01 can be inactive and not sense the device temperature. In this way, the sensing circuit 01 can only operate when it is necessary to sense the device temperature, thereby ensuring reliable sensing of the device temperature while reducing the power consumption of the sensing circuit 01. Furthermore, the target electrical signal can be, for example, a current signal.

[0099] Optionally, continue to refer to Figure 2 As can be seen, the sensing circuit 01 may include a sensing unit 011 and a reading unit 012.

[0100] The sensing unit 011 can be located on one side of the light-emitting device L1 and can be connected to the light-emitting control terminal EM and the reading unit 012 respectively. The reading unit 012 can also be connected to the power supply terminal, the light-emitting control terminal EM and the sampling circuit 02 respectively. Figure 2The positional relationship between the sensing unit 011 and the light-emitting device L1 is also not shown.

[0101] The power supply terminal can be, for example, the pull-up power supply terminal ELVDD connected to the pixel circuit P1. This simplifies wiring and saves costs. Of course, in some other embodiments, the power supply terminal can also be a different power supply terminal independent of the pull-up power supply terminal ELVDD.

[0102] The sensing unit 011 can be used to: sense the device temperature of the light-emitting device L1 in response to the light-emitting control signal, and output a control electrical signal based on the device temperature.

[0103] For example, the sensing unit 011 can sense the device temperature of the light-emitting device L1 when the potential of the light-emitting control signal is a first potential, and output a control electrical signal based on the device temperature; and the sensing unit 011 can stop sensing the device temperature of the light-emitting device L1 when the potential of the light-emitting control signal is a second potential. Furthermore, the control electrical signal output by the sensing unit 011 can be an AC signal generated based on temperature changes.

[0104] The reading unit 012 can be used to: respond to the light emission control signal and the control electrical signal, and output the target electrical signal based on the power signal provided by the power supply terminal.

[0105] For example, when the potential of the light emission control signal is a first potential and the potential of the control signal is also a first potential, the reading unit 012 can output the target electrical signal based on the power supply signal provided by the power supply terminal (e.g., ELVDD); and the reading unit 012 can stop outputting the target electrical signal when the potential of the light emission control signal and / or the potential of the control signal is a second potential.

[0106] That is, the sensing unit 011 and the reading unit 012 can cooperate to sense and output a target electrical signal that reflects the temperature of the device.

[0107] Optionally, Figure 3 This is a schematic diagram of another pixel compensation circuit provided in an embodiment of this application. Figure 3 As shown, the sampling circuit 02 may include a comparison unit 021 and a sampling unit 022.

[0108] The comparison unit 021 can be connected to the reference terminal V0, the sensing circuit 01, and the sampling unit 022, respectively. The sampling unit 022 can also be connected to the compensation circuit 03 and can be used to connect to the light-emitting device L1. The reference terminal V0 can be used to provide a reference value for the electrical signal. Furthermore, as described above, the comparison unit 021 can be connected to the reading unit 012 in the sensing circuit 01, and the sampling unit 022 can be connected to the anode of the light-emitting device L1.

[0109] The comparison unit 021 can be used to: compare the target electrical signal with the electrical signal reference value, and output a sampling enable signal when it is determined that the target electrical signal is greater than the electrical signal reference value.

[0110] In other words, the situation described above where the target electrical signal does not meet the electrical signal reference value can mean that the target electrical signal is greater than the electrical signal reference value, indicating an abnormal increase in the temperature of the indicator device. The comparison unit 021 can determine whether the target electrical signal is greater than the electrical signal reference value by comparing the magnitude of the target electrical signal and the electrical signal reference value. If it is determined that the target electrical signal is greater than the electrical signal reference value, it can output a sampling enable signal; if it is determined that the target electrical signal is not greater than the electrical signal reference value, it can stop outputting the sampling enable signal or output a de-enable signal.

[0111] Optionally, the potential of the sampling enable signal and the potential of the de-enable signal can be exactly opposite. For example, the potential of the sampling enable signal can be a high potential (1), while the potential of the de-enable signal can be a low potential (0).

[0112] The sampling unit 022 can be used to: in response to the sampling enable signal, sample and output the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1.

[0113] That is, the sampling unit 022 can start sampling the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1 and output the real-time drive signal when it receives the sampling enable signal output by the comparison unit 021 (indicating that the target electrical signal is greater than the electrical signal reference value and the device temperature rises abnormally). It will not work if it does not receive the sampling enable signal output by the comparison unit 021 or receives the de-enable signal output by the comparison unit 021 (indicating that the target electrical signal is not greater than the electrical signal reference value and the device temperature is normal).

[0114] In other words, the comparison unit 021 and the sampling unit 022 can cooperate to sample and output the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1, such as sampling the drive current flowing through the light-emitting device L1.

[0115] Combining the above records and Figure 4 As can be seen, the pixel compensation circuit provided in this application embodiment may include the following five modules: temperature device (corresponding to sensing unit 011), reading module (corresponding to reading unit 012), comparison module (corresponding to comparison unit 021), extraction module (corresponding to sampling unit 022) and voltage compensation module (corresponding to compensation circuit 03).

[0116] First, the temperature sensor detects the temperature of the display panel at different times, specifically the temperature of the light-emitting device L1 within the display panel, and converts the sensed temperature into a corresponding electrical signal. Then, the reading module reads the electrical signal from the temperature sensor. Next, the comparison module compares the signal read by the reading module with a preset electrical signal reference value. If the reading module determines that the signal does not meet the reference value, i.e., if the temperature is abnormally high, it provides an enable signal to the extraction module. Subsequently, the extraction module, in response to the received enable signal, extracts the current value flowing through the light-emitting device and outputs the extracted current value to the voltage compensation module. Finally, the voltage compensation module, using a functional relationship model between the established feedback voltage and the actual luminous brightness and luminous current, calculates the feedback voltage for compensation based on the received current value. This feedback voltage is then used to compensate the voltage of the data signal, further compensating the luminous drive current output from the pixel circuit to the light-emitting device. This counteracts the impact of abnormal temperature on the luminous drive current, ensuring the light-emitting device can emit light normally.

[0117] Optionally, combined Figure 1 and Figure 4 It can also be seen that the pixel circuit P1 in the pixel may include a driving transistor, which can be connected to the data terminal Vdata and the light-emitting device L1 in the pixel respectively, so as to output a light-emitting driving signal to the light-emitting device L1 based on the data signal provided by the data terminal Vdata, so as to drive the light-emitting device L1 to emit light. Of course, in addition to the driving transistor, other transistors may also be included, such as data writing transistors, light-emitting control transistors, and reset transistors, etc., which are not limited in this application embodiment.

[0118] Optionally, Figure 5 This is a schematic diagram of the film structure of a pixel compensation circuit provided in an embodiment of this application. Figure 6 This is a schematic diagram of the film structure of the sensing unit.

[0119] refer to Figure 5 It can be seen that the pixel circuit P1 and the light-emitting device L1 can be located on one side of the substrate 10 and can be stacked sequentially in a direction away from the substrate 10.

[0120] Combination Figure 5 and Figure 6 It can be seen that the sensing unit 011 may include: a first electrode 0111, a thermistor material layer 0112, and a second electrode 0113, which are located between the pixel circuit P1 and the light-emitting device L1 and are sequentially stacked along the direction close to the light-emitting device L1. Wherein, combined with Figure 2 In the sensing unit 011, the first electrode 0111 may be connected to the light emission control terminal EM, and the second electrode 0113 may be connected to the reading unit 012.

[0121] That is, the sensing unit 011, which serves as a temperature device, may include two electrodes and a thermistor material layer 0112 located between the two electrodes. Furthermore, a light emission control signal may be loaded onto the first electrode 0111, and the thermistor material layer 0113 may sense the temperature change of the light-emitting device L1 under the control of the light emission control signal and generate an alternating current signal. This alternating current signal may be output as a control signal through the second electrode 0113 to the reading unit 012, which serves as a reading module.

[0122] Optionally, continue to refer to Figure 5 It can be seen that the reading unit 012 and the pixel circuit P1 can be integrated. The sampling circuit 02 and the compensation circuit 03 can be integrated on a processing chip independent of the substrate 10, and the second electrode 0113 in the sensing unit 011 can be connected to the processing chip 2 through the flexible circuit board 1.

[0123] That is, the pixel circuit P1 can include a reading unit 012 as a reading module, which can be located on one side of the substrate 10. The sensing unit 011 as a temperature device can be located on the side of the pixel circuit P1 away from the substrate 10. The light-emitting device L1 can be located on the side of the sensing unit 011 away from the substrate 10. Furthermore, the comparison unit 021 as a comparison module, the sampling unit 022 as an extraction module, and the compensation circuit 03 as a voltage compensation module can all be integrated onto a separate processing chip 2 and connected to other circuits via the flexible circuit board 1. This structure results in a simple and compact display panel, which is beneficial for improving resolution and facilitating narrow bezel design. Of course, it is not limited to this. Figure 6 The structure is shown. For example, in some other embodiments, the reading unit 012 and the pixel circuit P1 can be independent of each other, and the reading unit 012 can be located between the pixel circuit P1 and the sensing unit 011. Furthermore, it is not limited to using a flexible circuit board to connect the circuit.

[0124] Optionally, Figure 7 This is a schematic diagram of the structure of a reading unit 012 provided in an embodiment of this application. For example... Figure 7 As shown, the reading unit 012 includes: a first switch section 0121 and a second switch section 0122.

[0125] The first switch 0121 can be connected to the sensing unit 011, the power supply terminal (e.g., ELVDD), and the second switch 0122. The second switch 0122 can also be connected to the light emission control terminal EM and the sampling circuit 02. Furthermore, in conjunction with... Figure 3 The second switch unit 0122 may be connected to the comparison unit 021 in the sampling circuit 02.

[0126] The first switch 0121 can be used to control the connection and disconnection between the power supply terminal and the second switch 0122 in response to a reference electrical signal.

[0127] For example, the first switch 0121 can control the power supply terminal ELVDD to conduct with the second switch 0122 when the potential of the reference electrical signal is the first potential, so that the power signal provided by the power supply terminal ELVDD can be transmitted to the second switch 0122; and the first switch 0121 can control the power supply terminal ELVDD to disconnect from the second switch 0122 when the potential of the reference electrical signal is the second potential.

[0128] The second switch 0122 can be used to: control the on / off state of the first switch 0121 and the sampling circuit 02 in response to the light emission control signal, and output the target electrical signal.

[0129] For example, when the potential of the light emission control signal is the first potential, the second switch 0122 can control the first switch 0121 to conduct with the comparison unit 021 in the sampling circuit 02, and simultaneously generate a target electrical signal based on the received power supply signal; and when the potential of the light emission control signal is the second potential, the second switch 0122 can control the first switch 0121 to disconnect from the comparison unit 021 in the sampling circuit 02.

[0130] Optionally, in Figure 7 Based on, and refer to Figure 8 It can be seen that the first switching part 0121 may include a first transistor T01. The second switching part 0122 may include a second transistor T02. Furthermore, the first transistor T01 and the second transistor T02 may be of different types. For example, refer to... Figure 8 The first transistor T01 shown is an N-channel transistor (i.e., an N-type transistor), and the second transistor T02 is a P-channel transistor (i.e., a P-type transistor). Of course, in some other embodiments, the first transistor T01 can also be a P-type transistor, and the second transistor T02 can also be an N-type transistor.

[0131] Specifically, the gate of the first transistor T01 can be connected to the sensing unit 011, which serves as a temperature device; the first terminal of the first transistor T01 can be connected to the power supply terminal ELVDD; the second terminal of the first transistor T01 can be connected to the first terminal of the second transistor T02; the gate of the second transistor T02 can be connected to the light-emitting control terminal EM; and the second terminal of the second transistor T02 can be connected to the sampling circuit 02. In conjunction with the preceding description, the second terminal of the second transistor T02 can be connected to the comparison unit 021, which serves as a comparison module in the sampling circuit 02.

[0132] Based on this, it can be seen that the gate of the first transistor T01 can receive a reference electrical signal output from the sensing unit 011, which serves as a temperature device, and can be turned on or off under the control of this reference electrical signal. Furthermore, since different temperatures generate different amounts of energy, the intensity of the electrical signal written to the gate of the first transistor T01 through the temperature device varies, and correspondingly, the degree to which the first transistor T01 is turned on varies. Consequently, the current at the second terminal of the second transistor T02 varies. Thus, different temperature conditions at different points in time can be distinguished by the signal output from the second terminal of the second transistor T02.

[0133] Optionally, Figure 9 This is a schematic diagram of the structure of a comparison unit 021 provided in an embodiment of this application. For example... Figure 9 As shown, the comparison unit 021 may include: a comparator Comp, a first resistor R1, and a second resistor R2. The first resistor R1 and the second resistor R2 serve to limit current.

[0134] Of the positive input terminal + and the negative input terminal - of comparator Comp, one input terminal can be connected to the sensing circuit 01 through the first resistor R1, and the other input terminal can be connected to the reference terminal V0 through the second resistor R2. The output terminal OUT0 of comparator Comp can be connected to the sampling unit 022. Furthermore, in conjunction with the preceding description, comparator Comp can be connected to the reading unit 012 in the sensing circuit 01.

[0135] Based on this, combined Figure 8 The comparator Comp can receive the signal output from the second terminal of the second transistor T02 and determine whether to send a sampling enable signal to the sampling unit 022, which is the extraction module, based on the received signal. As mentioned above, when the received signal is greater than the electrical signal reference value, the comparator Comp can output a sampling enable signal to prompt the sampling unit 022 to extract the driving current flowing through the light-emitting device L1.

[0136] Furthermore, based on the working principle of comparator Comp, with the positive input terminal + connected to the reading unit 012 in the sensing circuit 01 to receive the target electrical signal, and the negative input terminal - connected to the reference terminal V0 to receive the reference value of the electrical signal, comparator Comp can output a high-level sampling enable signal (1) through output terminal OUT0 when the target electrical signal is greater than the reference value of the electrical signal provided by the reference terminal V0. With the positive input terminal + connected to the reference terminal V0 to receive the reference value of the electrical signal, and the negative input terminal - connected to the reading unit 012 in the sensing circuit 01 to receive the target electrical signal, comparator Comp can output a low-level sampling enable signal (1) through output terminal OUT0 when the target electrical signal is greater than the reference value of the electrical signal provided by the reference terminal V0. For example, refer to... Figure 9The comparator Comp shown here has its negative input terminal - (labeled A) connected to the reference terminal V0, and its positive input terminal + (labeled B) connected to the readout unit 012 in the sensing circuit 01.

[0137] In addition, refer to Figure 9 It can also be seen that the comparator Comp can be connected to the positive power supply terminal V+ and the negative power supply terminal V- respectively, so as to operate based on the power signals provided by the positive power supply terminal V+ and the negative power supply terminal V-.

[0138] Optionally, the comparator Comp can be a hysteresis comparator with strong operational stability and strong anti-interference capability.

[0139] Alternatively, as an optional implementation: such as Figure 10 As shown, the sampling unit 022 may include: an amplifier OP-Amp, a capacitor Cfb, and a switch Cint.

[0140] The positive input terminal + of amplifier OP-Amp can be connected to the light-emitting device L1 (not shown in the figure), the negative input terminal - of amplifier OP-Amp can be grounded, and the output terminal OUT1 of amplifier OP-Amp can be connected to the compensation circuit 03.

[0141] The capacitor Cfb can be connected between the positive input terminal + and the negative input terminal - of the amplifier OP-Amp.

[0142] The switch Cint can be connected between the positive input terminal + and the negative input terminal - of the amplifier OP-Amp, and can also be connected to the comparator unit 021.

[0143] Based on this, when the comparison unit 021 outputs a sampling enable signal, the switch Cint included in the sampling unit 022 can be opened, the amplifier OP-Amp can operate, and the real-time drive signal transmitted from the pixel circuit P1 to the light-emitting device L1 is sampled. This real-time drive signal is then amplified and output to the compensation circuit 03 via the output terminal OUT1. This ensures that the real-time drive signal is reliably sampled and output to the compensation circuit 03. Conversely, when the comparison unit 021 stops outputting the sampling enable signal or outputs a de-enable signal, the switch Cint included in the sampling unit 022 can be closed, and the amplifier OP-Amp can stop operating, thus stopping the sampling of the real-time drive signal.

[0144] It is understandable that the real-time drive signal output by the output terminal OUT1 of the amplifier OP-Amp is generally an analog signal, while the compensation circuit 03 can process digital signals.

[0145] Accordingly, continue to refer to Figure 10It can be seen that the sampling unit 022 may also include an analog-to-digital converter (ADC) connected between the output terminal OUT1 of the amplifier OP-Amp and the compensation circuit 03. This ADC can be used to convert the real-time drive signal in analog form output by the amplifier OP-Amp into a digital signal and output it to the compensation circuit 03 for reliable processing. Figure 10 The output terminal of the analog-to-digital converter (ADC) is designated as OUT2.

[0146] exist Figure 10 Based on the structure, combined with Figure 11 As can be seen, the driver chip of the display panel can control the grayscale to switch between different brightness levels, enabling the sampling unit 022 to detect the driving current flowing through the light-emitting device L1, that is, to extract the corresponding current signal for the model building of the compensation circuit 03. The driver chip is similar to the host or computer of the display panel. Figure 11 In the diagram, the horizontal axis represents the voltage Vdata of the data signal, the vertical axis represents the driving current Current, and Gray represents the grayscale level. Figure 11 Used to represent the driving current generated under different data signal voltages, and the corresponding display grayscale of the driving current, which is expressed as luminous brightness.

[0147] Alternatively, as another optional implementation, such as Figure 12 As shown, the sampling unit 022 may include: a controller ( Figure 12 (Not shown) and at least one sampling transistor.

[0148] The controller can be connected to the comparator unit 021. At least one sampling transistor can be connected to the scan switch terminal Scan and the sensing line Sensing respectively, and is also used to connect to the light-emitting device L1 (which may refer to the anode of the light-emitting device L1). The scan switch terminal Scan can be connected to the controller, and the sensing line Sensing can be connected to the compensation circuit 03.

[0149] For example, Figure 12 At least one sampling transistor shown may include transistor T7. The gate of transistor T7 may be connected to the scan switch terminal Scan5, and transistor T7 may be indirectly connected to the anode of the light-emitting device L1 through transistors T4 and T2 in the pixel. The compensation circuit 03 may include a digital-to-analog converter (DAC). The controller may be the driver chip described above. Furthermore, refer to... Figure 12It can also be seen that the pixel circuit in the pixel can include transistors T1 to T6, T8, and storage capacitor C1. The gates of transistors T1 to T4 can be connected to the scan switches Scan1 to Scan4 respectively; the gate of transistor T5 can be connected to the light emission control terminal EM; the gate of transistor T8 is connected to the scan switch terminal Scan6; the first terminal of transistor T3 can be connected to the reference signal terminal Vref; the first terminal of transistor T5 can be connected to the pull-up power supply terminal ELVDD; and the first terminal of transistor T8 can be connected to the data terminal Vdata. Transistor T6 is the driving transistor described above. The connections between the transistors and the connection method of the storage capacitor can be found in [reference needed]. Figure 12 That will not be elaborated upon here. Figure 12 The anode connection point between transistor T6 and light-emitting device L1 is designated as node A.

[0150] Optionally, Figure 12 Each transistor shown can be an N-type transistor. Alternatively, in some other embodiments, each transistor can also be a P-type transistor. Or, it may include both P-type and N-type transistors. For example, using... Figure 12 The structure shown, and with Figure 12 All the transistors shown are N-type transistors, with the effective potential being higher than the inactive potential, as an example. Figure 13 A circuit timing diagram is shown.

[0151] Combination Figure 13 As can be seen, in stage t01, the scan switch terminals Scan1 to Scan4 can provide high-level scan switch signals, causing transistors T1 to T4 to be turned on. This allows the reference signal provided by the reference signal terminal Vref to be transmitted sequentially through the turned-on transistors T3, T4, and T1 to the gate of transistor T6, and then sequentially through transistors T3 and T2 to node A, thereby resetting the gate of transistor T6 and the anode of the light-emitting device L1. Accordingly, stage t01 can also be called the reset stage.

[0152] In stage t02, the scan switches Scan1 and Scan6 can provide high-level scan switch signals, turning on transistors T8 and T1. This allows the data signal provided by the DAC to the data terminal Vdata to be transmitted sequentially through the turned-on transistors T8 and T1 to the gate of transistor T6, charging the gate of transistor T6. Accordingly, stage t02 can also be called the data writing stage.

[0153] During stage t03, the light-emitting control terminal EM can provide a high-potential light-emitting control signal, causing transistor T5 to turn on. This, in turn, creates a path between the pull-up power supply terminal ELVDD and the pull-down power supply terminal ELVSS, thereby illuminating the light-emitting device L1. Accordingly, stage t03 can also be referred to as the light-emitting stage.

[0154] In stage t04, the light-emitting control terminal EM can continue to provide a high-potential light-emitting control signal to illuminate the light-emitting device L1. Simultaneously, the scan switch terminals Scan2, Scan4, and Scan5 can provide high-potential scan switch signals, turning on transistors T2, T4, and T7. This allows the current at node A to serve as a real-time drive signal, sequentially transmitted through the turned-on transistors T2, T4, and T7 to the sensing line Sensing, and then output to the compensation circuit 03 via the sensing line Sensing, completing the detection sampling. Accordingly, stage t04 can also be called the sensing stage. The current at node A is the light-emitting drive current flowing through the light-emitting device L1. Afterwards, the compensation circuit 03 can determine the feedback voltage based on the received real-time drive signal and use the feedback voltage to compensate the voltage of the data signal provided by the data terminal Vdata, i.e., provide the feedback voltage to the data terminal Vdata. Of course, in some other embodiments, stages t04 and t03 can be executed simultaneously.

[0155] Based on the above description, it can be seen that when the controller receives the sampling enable signal output by the comparator unit 021, it controls the scan switches Scan2, Scan4, and Scan5 to provide valid potential (e.g., high potential) scan switch signals, causing transistors T2, T4, and T7 to turn on. Conversely, when the controller receives a signal from the comparator unit 021 indicating that it has stopped outputting the sampling enable signal or has output a de-enable signal, it can control the scan switches Scan2, Scan4, and Scan5 to provide invalid potential (e.g., low potential) scan switch signals, causing transistors T2, T4, and T7 to turn off, thereby causing the sampling unit 022 to stop sampling the real-time drive signal.

[0156] It is understood that the circuit partitioning described above is merely illustrative. For example, in some other embodiments, transistors T2, T4, and T7 may all be assigned to sampling unit 022, meaning sampling unit 022 may include three sampling transistors. Furthermore, the compensation circuit 03 does not only include… Figure 12The DAC is shown. The compensation circuit 03 may also include other circuits, such as a processor. This processor can establish the training model described above and perform the compensation actions described above: inputting the real-time drive current output from the sampling circuit 02 and the real-time luminance of the light-emitting device L1 driven by the real-time drive current into the training model to obtain a feedback voltage, which is then used to compensate the voltage of the data signal. The DAC is used to convert the compensated data signal from a digital signal to an analog signal, which then drives the pixel circuit.

[0157] Based on the above description, this application provides a pixel compensation circuit. The circuit includes five modules: a sensing unit 011 as a temperature device, a reading unit 012 as a reading module, a comparison unit 021 as a comparison module, an extraction module as a sampling unit 022, and a voltage compensation module as a compensation circuit 03.

[0158] The temperature sensor and readout module can be integrated with the pixel circuit and mounted on the substrate, while being compatible with the light-emitting control signal provided by the light-emitting control terminal EM received by the pixel circuit. When the light-emitting device L1 emits light, i.e., when the display panel emits light, the first electrode 0111 of the temperature sensor and the second transistor T02 in the readout module can be loaded with the light-emitting control signal. When the potential of the light-emitting control signal is an effective potential, the second transistor T02 can be turned on, and the temperature sensor can sense the device temperature of the light-emitting device L1. When the temperature remains constant, the first transistor T01 in the readout module is turned off, and the light-emitting drive current flowing through the light-emitting device L1 is not sampled. As the display time of the display panel increases, the surface temperature of the light-emitting device L1 gradually rises. At this time, the temperature change causes the temperature sensor to generate an alternating current signal, thereby controlling the first transistor T01 to turn on. Furthermore, since the energy is different at different temperatures, the signal strength written to the first transistor T01 is also different, thus allowing the first transistor T01 to be turned on at different degrees, and the output current of the second electrode of the second transistor T02 to be different, thereby distinguishing the temperature conditions at different points in time.

[0159] Next, the signal output from the second terminal of the second transistor T02 passes through a comparison module. The comparison module compares this signal with a set value (i.e., an electrical signal reference value). If it determines that the signal is outside the set value range (e.g., greater than the electrical signal reference value), it outputs a sampling enable signal to the extraction module. This sampling enable signal triggers the extraction module to extract the light-emitting drive current flowing through the light-emitting device L1. Furthermore, it is understood that the comparison module can be, for example, a comparator as described above, and the non-inverting or negative input terminal of the comparator can receive the set value. When the non-inverting input terminal of the comparator receives the set value, it outputs a high-level sampling enable signal; when the negative input terminal of the comparator receives the set value, it outputs a low-level sampling enable signal. Also, the comparator can be, for example, a hysteresis comparator as described above.

[0160] Subsequently, under the control of the sampling enable signal, the extraction module can extract the light-emitting drive current value output from the pixel circuit P1 to the light-emitting device L1. That is, this extraction module can function as both a current sensor and a voltage sensor. Finally, the voltage compensation module can calculate the compensation value used to feed back the true light-emitting brightness based on the established functional relationship model between the feedback voltage and the actual luminous brightness and luminous current, thus offsetting the changes in luminous current caused by abnormal temperature rise and maintaining the normal brightness display of the display panel.

[0161] In summary, this application provides a pixel compensation circuit. In this pixel compensation circuit, the sensing circuit can sense and output an electrical signal reflecting the temperature of the light-emitting device, and the sampling circuit can sample and output the real-time driving signal from the pixel circuit to the light-emitting device when a temperature anomaly is determined based on this electrical signal. The compensation circuit can compensate the data signal based on this real-time driving signal. Therefore, it can achieve the purpose of compensating the light-emitting driving signal output by the pixel circuit to the light-emitting device based on the data signal, avoiding the influence of temperature anomalies on the light-emitting driving signal, thereby ensuring that the light-emitting device emits light normally, resulting in a better display effect on the display panel.

[0162] This application also provides a pixel compensation method, which can be used to compensate for the light-emitting driving signal transmitted from the pixel circuit to the light-emitting device based on the data signal provided by the data terminal, and can be applied to the pixel compensation circuit described in the above embodiments. Figure 14 As shown, the method includes:

[0163] Step 1401: The sensor circuit in the pixel compensation circuit senses the device temperature of the light-emitting device, and the sensor circuit outputs a target electrical signal reflecting the device temperature based on the device temperature.

[0164] Step 1402: When the target electrical signal does not meet the reference value of the electrical signal, the sampling circuit in the pixel compensation circuit samples and outputs the real-time driving signal transmitted from the pixel circuit to the light-emitting device.

[0165] Among them, the electrical signal reference value is the electrical signal that reflects the device temperature of the light-emitting device when it emits normal brightness.

[0166] Step 1403: The compensation circuit in the pixel compensation circuit compensates the data signal provided by the data terminal based on the real-time driving signal, so as to compensate the light-emitting driving signal transmitted from the pixel circuit to the light-emitting device.

[0167] Optionally, combined Figure 4 As mentioned above, Figure 15 A schematic diagram of a compensation method using a compensation circuit is also shown. (Combined with...) Figure 15 As can be seen, this method may include:

[0168] Step 1501: Obtain the actual luminous brightness, luminous current and required feedback voltage of several display panels at a specific brightness, and use the actual luminous brightness, luminous current and feedback voltage as a sample set.

[0169] Optionally, as mentioned above, the display panels can be of the same model, for example, display panels of the same model produced in the same or different batches. The temperature rise of several display panels over time at a specific brightness will cause changes in the luminous current, resulting in different actual luminous brightness. Consequently, the required feedback voltage for compensation will differ. Based on this, the luminous current and feedback voltage of each display panel at its actual luminous brightness can be considered as a sample. Furthermore, the luminous current and feedback voltage of several display panels at their actual luminous brightness can be used as a set of samples, constituting a sample set of the actual luminous brightness, luminous current, and feedback voltage of the display panels. Of course, the more display panels there are, the more samples in the sample set, and the more accurate the functional relationship model obtained during training will be.

[0170] Step 1502: Using the actual luminous intensity and luminous current as input parameters and the feedback voltage as output parameter, train the sample to establish a functional relationship model between the feedback voltage and the actual luminous intensity and luminous current that changes over time.

[0171] Optionally, as described above, the sample set can be divided into an input sample set and an output sample set. The actual luminous intensity and luminous current can be used as the input sample set, and the corresponding feedback voltage can be used as the output sample set. Then, by training the input and output sample sets, a functional relationship model between the display panel's feedback voltage and the actual luminous intensity and luminous current can be obtained, thus establishing the functional relationship model between the feedback voltage for collecting the display panel's brightness and the actual luminous intensity and luminous current of the display panel.

[0172] For example, training a sample set can mean training the sample set using a neural network algorithm.

[0173] Step 1503: The extraction module obtains the actual luminous brightness and luminous current of the display panel at a certain time point, and calculates the feedback voltage of the display panel at that time point based on the functional relationship model.

[0174] Optionally, as mentioned above, after establishing the functional relationship model, the luminous current and corresponding luminous brightness output by the sampling unit, which serves as the extraction module, at a certain time point can be input into the functional relationship model to quickly and accurately obtain the feedback voltage of the display panel at that time point.

[0175] Step 1504: Feed the calculated feedback voltage back to the data voltage for compensation.

[0176] Finally, the compensation circuit, which is the voltage compensation module, can feed back the calculated feedback voltage to the voltage of the data signal (also known as the data voltage) to compensate the data voltage, thereby further compensating the light-emitting drive signal (e.g., light-emitting current) output by the pixel circuit to the light-emitting device, and solving the problem of abnormal light emission of the display panel caused by abnormal light-emitting current.

[0177] It is understandable that, since the pixel compensation method has essentially the same technical effect as the pixel compensation circuit described above, the technical effect of the pixel compensation method will not be described again here for the sake of brevity.

[0178] This application also provides a display device. For example... Figure 16 As shown, the display device includes: a display panel 000, a pixel circuit P1 and a light-emitting device L1 located on the display panel 000, and a pixel compensation circuit 00 as described in the above embodiment.

[0179] The pixel circuit P1 is used to transmit the light-emitting drive signal to the light-emitting device L1 based on the data signal provided by the data terminal Vdata; the pixel compensation circuit 00 is used to compensate for the effect of temperature on the light-emitting drive signal.

[0180] The structure comprising pixel circuit P1 and light-emitting device L1 can be referred to as a pixel. Correspondingly, combined with... Figure 16 It can also be seen that the display panel may include multiple pixels arranged in an array.

[0181] It is understandable that, since the display device and the pixel compensation circuit described above have essentially the same technical effect, the technical effect of the display device will not be described again here for the sake of brevity.

[0182] Optionally, the display device can be an OLED display device. Furthermore, the display device can be any suitable display device, including but not limited to mobile phones, tablets, televisions, monitors, laptops, digital photo frames, navigators, and e-readers, as well as any product or component with display functionality.

[0183] It should be noted that the terminology used in the embodiments section of this application is only for explaining the embodiments of this application and is not intended to limit this application. Unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains.

[0184] For example, the terms "first," "second," "third," and similar words used in the patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising" or "including," and similar words mean that the element or object preceding "comprising" or "including" encompasses the element or object listed after "comprising" or "including," and does not exclude other elements or objects. The terms "connected" or "linked," and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly. "And / or" indicates that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0185] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pixel compensation circuit, characterized in that, Used to compensate for the light-emitting drive signal transmitted from the pixel circuit to the light-emitting device based on the data signal provided by the data terminal; The pixel compensation circuit includes a sensing circuit, a sampling circuit, and a compensation circuit. The sensing circuit is located on one side of the light-emitting device and is connected to the sampling circuit. The sampling circuit is also connected to the compensation circuit and is used to connect to the light-emitting device. The compensation circuit is also connected to the data terminal. The sensing circuit is used to: sense the device temperature of the light-emitting device, and output a target electrical signal reflecting the device temperature based on the device temperature; The sampling circuit is used to: sample and output the real-time driving signal transmitted from the pixel circuit to the light-emitting device when the target electrical signal does not meet the electrical signal reference value, wherein the electrical signal reference value is an electrical signal reflecting the device temperature of the light-emitting device when the light-emitting device emits normal brightness; wherein the driving signal in the real-time driving signal and the light-emitting driving signal are both driving currents flowing through the light-emitting device, and the pixel circuit is used to generate the driving current based on the data signal; The compensation circuit is used to: input the real-time driving current output by the sampling circuit and the real-time luminous brightness of the light-emitting device under the driving of the real-time driving current into the training model to obtain a feedback voltage; and use the feedback voltage to compensate the voltage of the data signal to compensate the light-emitting driving signal transmitted by the pixel circuit to the light-emitting device; wherein, the training model is a model trained based on a sample set, the sample set including multiple input parameters and multiple output parameters that correspond one-to-one, each input parameter including the real driving current flowing through the light-emitting device and the real luminous brightness of the light-emitting device under the driving of the real driving current, each output parameter including the feedback voltage required to generate the real driving current, and the multiple input parameters and multiple output parameters that correspond one-to-one are parameters of the light-emitting device changing with time under a fixed brightness in multiple different display panels.

2. The pixel compensation circuit according to claim 1, characterized in that, The pixel circuit is also used to drive the light-emitting device to emit light based on the light-emitting control signal provided by the light-emitting control terminal; the sensing circuit is also connected to the light-emitting control terminal. Furthermore, the sensing circuit is configured to: sense the device temperature of the light-emitting device in response to the light-emitting control signal, and output a target electrical signal reflecting the device temperature based on the device temperature.

3. The pixel compensation circuit according to claim 2, characterized in that, The sensing circuit includes a sensing unit and a reading unit; the sensing unit is located on one side of the light-emitting device and is connected to the light-emitting control terminal and the reading unit respectively; the reading unit is also connected to the power supply terminal, the light-emitting control terminal and the sampling circuit respectively. The sensing unit is used to: sense the device temperature of the light-emitting device in response to the light-emitting control signal, and output a control electrical signal based on the device temperature; The reading unit is used to: respond to the light emission control signal and the control electrical signal, and output the target electrical signal based on the power signal provided by the power supply terminal.

4. The pixel compensation circuit according to claim 3, characterized in that, The pixel circuit and the light-emitting device are located on one side of the substrate and are stacked sequentially in a direction away from the substrate; The sensing unit includes: a first electrode, a thermistor material layer, and a second electrode, which are located between the pixel circuit and the light-emitting device and are stacked sequentially in the direction close to the light-emitting device, wherein the first electrode is connected to the light-emitting control terminal and the second electrode is connected to the reading unit.

5. The pixel compensation circuit according to claim 4, characterized in that, The reading unit is integrated with the pixel circuit. The sampling circuit and the compensation circuit are integrated on a processing chip independent of the substrate, and the second electrode in the sensing unit is connected to the processing chip through a flexible circuit board.

6. The pixel compensation circuit according to claim 3, characterized in that, The reading unit includes: a first switch section and a second switch section; The first switch is connected to the sensing unit, the power supply terminal and the second switch, and the second switch is also connected to the light emission control terminal and the sampling circuit. The first switch is used to: control the connection and disconnection between the power supply terminal and the second switch in response to the control electrical signal; The second switch is used to: control the on / off state of the first switch and the sampling circuit in response to the light emission control signal, and output the target electrical signal.

7. The pixel compensation circuit according to claim 6, characterized in that, The first switching section includes a first transistor; the second switching section includes a second transistor; and the first transistor and the second transistor are of different types. The gate of the first transistor is connected to the sensing unit, the first electrode of the first transistor is connected to the power supply terminal, the second electrode of the first transistor is connected to the first electrode of the second transistor, the gate of the second transistor is connected to the light emission control terminal, and the second electrode of the second transistor is connected to the sampling circuit.

8. The pixel compensation circuit according to any one of claims 1 to 7, characterized in that, The sampling circuit includes a comparison unit and a sampling unit; the comparison unit is connected to a reference terminal, the sensing circuit and the sampling unit respectively, the sampling unit is also connected to the compensation circuit and is used to connect to the light-emitting device, and the reference terminal is used to provide the electrical signal reference value; The comparison unit is used to: compare the target electrical signal with the electrical signal reference value, and output a sampling enable signal when it is determined that the target electrical signal is greater than the electrical signal reference value; The sampling unit is used to: in response to the sampling enable signal, sample and output the real-time driving signal transmitted by the pixel circuit to the light-emitting device.

9. The pixel compensation circuit according to claim 8, characterized in that, The comparison unit includes: a comparator, a first resistor, and a second resistor; Of the positive and negative input terminals of the comparator, one input terminal is connected to the sensing circuit through the first resistor, and the other input terminal is connected to the reference terminal through the second resistor. The output terminal of the comparator is connected to the sampling unit.

10. The pixel compensation circuit according to claim 8, characterized in that, The sampling unit includes: an amplifier, a capacitor, and a switch; The positive input terminal of the amplifier is used to connect to the light-emitting device, the negative input terminal of the amplifier is grounded, and the output terminal of the amplifier is connected to the compensation circuit. The capacitor is connected between the positive and negative input terminals of the amplifier. The switch is connected between the positive and negative input terminals of the amplifier and is also connected to the comparator unit.

11. The pixel compensation circuit according to claim 10, characterized in that, The real-time drive signal output from the amplifier is an analog signal, while the signal processed by the compensation circuit is a digital signal. The sampling unit further includes an analog-to-digital converter connected between the output of the amplifier and the compensation circuit. The analog-to-digital converter is used to convert the real-time drive signal in analog form output by the amplifier into a digital signal and then output it to the compensation circuit.

12. The pixel compensation circuit according to claim 8, characterized in that, The sampling unit includes: a controller and at least one sampling transistor; The controller is connected to the comparison unit, the at least one sampling transistor is connected to the scan switch terminal and the sensing line respectively, and is also used to connect to the light-emitting device, the scan switch terminal is connected to the controller, and the sensing line is connected to the compensation circuit.

13. A pixel compensation method, characterized in that, The method is used to compensate for the light-emitting driving signal transmitted from the pixel circuit to the light-emitting device based on the data signal provided by the data terminal, and is applied in the pixel compensation circuit as described in any one of claims 1 to 12; the method includes: The sensor circuit in the pixel compensation circuit senses the device temperature of the light-emitting device, and the sensor circuit outputs a target electrical signal reflecting the device temperature based on the device temperature. When the target electrical signal does not meet the electrical signal reference value, the sampling circuit in the pixel compensation circuit samples and outputs the real-time driving signal transmitted by the pixel circuit to the light-emitting device. The electrical signal reference value is an electrical signal reflecting the device temperature of the light-emitting device when it emits normal brightness. The driving signal in both the real-time driving signal and the light-emitting driving signal is a driving current flowing through the light-emitting device, and the pixel circuit is used to generate the driving current based on the data signal. The real-time driving current output by the sampling circuit and the real-time luminous intensity of the light-emitting device driven by the real-time driving current are input into the training model through the compensation circuit in the pixel compensation circuit to obtain a feedback voltage; and the feedback voltage is used to compensate the voltage of the data signal to compensate the light-emitting driving signal transmitted by the pixel circuit to the light-emitting device; wherein, the training model is a model trained based on a sample set, the sample set including multiple input parameters and multiple output parameters that correspond one-to-one, each input parameter including the real driving current flowing through the light-emitting device and the real luminous intensity of the light-emitting device driven by the real driving current, each output parameter including the feedback voltage required to generate the real driving current, and the multiple input parameters and multiple output parameters that correspond one-to-one are parameters of the light-emitting device changing with time at a fixed brightness in multiple different display panels.

14. A display device, characterized in that, The display device includes: a display panel, pixel circuits and light-emitting devices located on the display panel, and a pixel compensation circuit as described in any one of claims 1 to 12; The pixel circuit is used to transmit a light-emitting driving signal to the light-emitting device based on the data signal provided by the data terminal; The pixel compensation circuit is used to compensate for the effect of temperature on the light emission driving signal.

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