Sub-pixel circuit

Abstract

The embodiment of the application discloses a sub-pixel circuit, which comprises a passive drive circuit, an internal compensation type circuit and a light-emitting diode. The internal compensation type circuit comprises a first data writing interface. The passive drive circuit comprises a second data writing interface and a sweep signal writing interface. The second data writing interface is used for writing a second data voltage, and the sweep signal writing interface is used for receiving a sweep signal. The passive drive circuit is used for changing the voltage of a connection point of the passive drive circuit and the internal compensation type circuit according to the second data voltage and the sweep signal. The internal compensation type circuit is used for turning on or cutting off a path between the first data writing interface and the light-emitting diode according to the voltage of the connection point. When the path is turned on, the light-emitting diode emits light under the drive of the first data voltage. When the path is cut off, the light-emitting diode is extinguished. The embodiment of the application can solve the problems of gray scale loss and display defects of a display when displaying low gray scales.

Description

Technical Field

[0001] This application relates to the field of electronic technology, specifically to a sub-pixel circuit. Background Technology

[0002] Micro LED technology is a technique that miniaturizes and matrixes light-emitting diodes (LEDs). Micro LED displays offer numerous advantages, including high brightness, short response time, and low power consumption. Furthermore, they are self-emissive and require no backlight, making them a mainstream trend in future display technology with excellent development prospects. Micro LED displays primarily employ an active-matrix design, but uneven brightness occurs when displaying low grayscale levels. Current technologies mainly address this unevenness by reducing the driving voltage at low grayscale levels, but this method can lead to the loss of certain grayscale levels, resulting in poor display quality. Summary of the Invention

[0003] This application discloses a sub-pixel circuit that can solve the problems of grayscale loss and poor display when the display shows low grayscale.

[0004] This application discloses a sub-pixel circuit, characterized in that the sub-pixel circuit includes a passive driving circuit, an internal compensation circuit, and a light-emitting diode; the passive driving circuit is connected to the internal compensation circuit, and the light-emitting diode is connected to the internal compensation circuit;

[0005] The internal compensation circuit includes a first data writing interface; the first data writing interface is used to write a first data voltage; the passive drive circuit includes a second data writing interface and a sweep signal writing interface; the second data writing interface is used to write a second data voltage, and the sweep signal writing interface is used to receive a sweep signal.

[0006] The passive drive circuit is used to change the voltage at the connection point between the passive drive circuit and the internal compensation circuit according to the second data voltage and the frequency sweep signal.

[0007] The internal compensation circuit is used to turn on or off the path between the first data writing interface and the light-emitting diode according to the voltage at the connection point; when the path is turned on, the light-emitting diode emits light under the drive of the first data voltage; when the path is turned off, the light-emitting diode turns off.

[0008] As an optional implementation, the passive driving circuit further includes a ninth thin-film transistor; the first electrode of the ninth thin-film transistor is connected to the connection point, and the second electrode of the ninth thin-film transistor is used to receive the input of the power supply voltage; the gate of the ninth thin-film transistor is connected to the second data writing interface and the sweep signal writing interface respectively; the gate voltage of the ninth thin-film transistor changes under the coupling of the second data voltage and the sweep signal.

[0009] The ninth thin-film transistor is configured to turn off when the gate voltage is higher than the turn-on voltage of the ninth thin-film transistor; when the ninth thin-film transistor is turned off, the voltage at the connection point is a first voltage;

[0010] The internal compensation circuit is used to connect the first data writing interface and the light-emitting diode when the voltage at the connection point is the first voltage.

[0011] The ninth thin-film transistor is configured to turn on when the gate voltage is lower than the turn-on voltage of the ninth thin-film transistor; when the ninth thin-film transistor is turned on, the voltage at the connection point is the power supply voltage; the power supply voltage is higher than the first voltage.

[0012] The internal compensation circuit is used to cut off the path between the first data writing interface and the light-emitting diode when the voltage at the connection point is the power supply voltage.

[0013] As an optional implementation, the passive driving circuit further includes a tenth thin-film transistor and a second capacitor; the second data writing interface includes a first electrode of the tenth thin-film transistor, and the second electrode of the tenth thin-film transistor is connected to the gate of the ninth thin-film transistor; one end of the second capacitor is connected to the second electrode of the tenth thin-film transistor and the gate of the ninth thin-film transistor respectively; the sweep frequency signal writing interface includes the other end of the second capacitor.

[0014] As an optional implementation, the passive driving circuit further includes an eleventh thin-film transistor; the internal compensation circuit further includes a sixth thin-film transistor; the first electrode of the eleventh thin-film transistor is connected to one end of the second capacitor and the second electrode of the tenth thin-film transistor, the second electrode of the eleventh thin-film transistor is connected to the first electrode of the sixth thin-film transistor, and the gate of the eleventh thin-film transistor is connected to the gate of the sixth thin-film transistor; the second electrode of the sixth thin-film transistor is connected to the connection point between the passive driving circuit and the internal compensation circuit.

[0015] As an optional implementation, the sub-pixel circuit is connected to the controller;

[0016] The controller is used to input the first data voltage, the second data voltage, and the sweep frequency signal to the sub-pixel circuit.

[0017] As an optional implementation, the controller is connected to a plurality of the sub-pixel circuits respectively;

[0018] The controller is configured to write different second data voltages to the second data write interfaces of each of the sub-pixel circuits.

[0019] As an optional implementation, the first data write interfaces of each of the sub-pixel circuits are interconnected;

[0020] The controller is configured to simultaneously write the first data voltage to the first data write interface of each of the sub-pixel circuits.

[0021] As an optional implementation, the passive drive circuit further includes a twelfth thin-film transistor; the first electrode of the ninth thin-film transistor is also connected to the first electrode of the twelfth thin-film transistor; the second electrode and gate of the twelfth thin-film transistor are respectively connected to the controller;

[0022] The controller is used to cut off the path between the passive drive circuit and the internal compensation circuit, and to maintain the sweep frequency signal at a fixed level.

[0023] The controller is also configured to detect the current flowing through the ninth thin film transistor and the twelfth thin film transistor through the second electrode of the twelfth thin film transistor when the light-emitting diode is off, and adjust the second data voltage written to the second data writing interface according to the current.

[0024] As an optional implementation, the controller is configured to increase the second data voltage written to the second data write interface to a preset voltage value when the current flowing through the ninth thin-film transistor and the twelfth thin-film transistor is less than a preset current value.

[0025] As an optional implementation, the sub-pixel circuit further includes an eighth thin-film transistor; the passive driving circuit is connected to the first electrode of the eighth thin-film transistor, and the internal compensation circuit is connected to the second electrode of the eighth thin-film transistor; the connection point between the passive driving circuit and the internal compensation circuit includes the connection point between the second electrode of the eighth thin-film transistor and the internal compensation circuit; the gate of the eighth thin-film transistor is used to receive a control signal; the eighth thin-film transistor switches different switching states according to the control signal.

[0026] When the eighth thin-film transistor is in the ON state, the path between the passive drive circuit and the internal compensation circuit is in the ON state.

[0027] When the eighth thin-film transistor is in the off state, the path between the passive drive circuit and the internal compensation circuit is cut off.

[0028] Compared with related technologies, the embodiments of this application have the following beneficial effects:

[0029] This application discloses a sub-pixel circuit, which includes a passive driving circuit that can change the voltage at the connection point between the passive driving circuit and the internal compensation circuit according to the written second data voltage and the input sweep frequency signal. The internal compensation circuit included in the sub-pixel circuit can turn on or off the path between the first data writing interface and the light-emitting diode according to the voltage at the connection point, so as to control the light-emitting diode to light up or turn off.

[0030] As can be seen, the sub-pixel circuit of this application introduces a passive driving circuit, which enables the internal compensation circuit to switch the light emission state of the light-emitting diode according to the second data voltage and the sweep frequency signal input to the passive driving circuit. This allows the sub-pixel circuit to control the light emission duration of the light-emitting diode according to different grayscale display requirements, thereby improving the brightness uniformity of the display when displaying low grayscale, and solving the problems of grayscale loss and poor display when displaying low grayscale. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the 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.

[0032] Figure 1 This is a schematic diagram of a sub-pixel circuit based on a related technology.

[0033] Figure 2 This is a schematic diagram of the structure of a sub-pixel circuit disclosed in an embodiment of this application;

[0034] Figure 3 This is a schematic diagram of another seed pixel circuit disclosed in an embodiment of this application;

[0035] Figure 4 This is a schematic diagram of another seed pixel circuit disclosed in an embodiment of this application;

[0036] Figure 5 This is a schematic diagram of another seed pixel circuit disclosed in an embodiment of this application;

[0037] Figure 6 This is a schematic diagram of the structure of a display panel disclosed in an embodiment of this application;

[0038] Figure 7 This is a schematic diagram illustrating the process of a passive driving circuit changing the emission duration of a sub-pixel, as disclosed in an embodiment of this application.

[0039] Figure 8 This is a schematic diagram of the driving signals of a display panel within one frame, as disclosed in an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of another type of drive signal for a display panel within a frame, as disclosed in an embodiment of this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a sub-pixel circuit based on a related technology. For example... Figure 1 As shown, the sub-pixel circuit is a 7T1C structure, which is an internal compensation type circuit. The 7T1C structure consists of 7 thin-film transistors (TFTs) and 1 storage capacitor. The sub-pixel circuit includes a first thin-film transistor 101, a second thin-film transistor 102, a third thin-film transistor 103, a fourth thin-film transistor 104, a fifth thin-film transistor 105, a sixth thin-film transistor 106, a seventh thin-film transistor 107, a light-emitting diode 203, and a first capacitor 109.

[0044] Thin-film transistors (TFTs) are voltage-type switching devices. A TFT consists of three electrodes: the source, drain, and gate. When the gate voltage of the TFT is greater than the turn-on voltage, the source and drain are connected; when the gate voltage is less than the turn-on voltage, the source and drain are disconnected.

[0045] Each subpixel circuit includes a light-emitting diode 203, i.e., a Micro LED.

[0046] Because Micro LED displays generally use an active-drive design, displaying colors with 0-255 gray levels conforms to the gamma 2.2 standard. The formula for gamma 2.2 is:

[0047] L = L²⁵⁵ * (L / L²⁵⁵)^gamma;

[0048] Where L represents the brightness of the sub-pixel, L255 is the grayscale value of the sub-pixel at grayscale level 255 (i.e., the maximum grayscale level), and L is the grayscale value at grayscale level i, where i can be an integer in the range of 0 to 255; gamma is 2.2. Gamma 2.2 is the optimal value for brightness perceived by the human eye. Therefore, a Micro LED display of a color at 255 grayscale levels will conform to a light-current (LI) curve with gamma 2.2, which is the curve of the LED chip driving current versus brightness.

[0049] Micro LEDs with active-drive design exhibit uneven brightness when displaying low grayscale levels (such as 0-32 grayscale levels). This is mainly because the L1 curve of Micro LEDs is too steep, resulting in uneven brightness due to the unevenness of the first data voltage and the electrical properties of the TFT devices when displaying low grayscale levels.

[0050] In related technologies, to address the issue of uneven display brightness, the data line voltage driving the display panel is typically reduced when displaying low grayscale levels. This reduces the current flowing through the TFT device, limiting the current to the Micro LED. When the current to the Micro LED decreases, it emits lower brightness light. This method of controlling brightness through active devices is called active-mode display driving. However, Micro LED displays are current-driven light-emitting units, unlike liquid crystal displays which are voltage-driven. Current-mode control requires controlling the current flowing through the TFT to control the current flowing through the Micro LED. Therefore, in low grayscale situations, the data line voltage driving the display panel is relatively small, varying within a minimum unit voltage range. Consequently, the brightness difference caused by current variations in the Micro LED is not significant, resulting in some grayscale levels being lost and unable to be displayed.

[0051] This application discloses a sub-pixel circuit that can solve the problems of grayscale loss and poor display quality in Micro LED displays when displaying low grayscale levels. These will be described in detail below.

[0052] The sub-pixel circuit disclosed in this application can be applied to Micro LED displays in electronic devices, which may include, but are not limited to, mobile phones, computers, televisions, etc. The Micro LED can be an LED chip with a size of less than 50 micrometers (μm) * 50 μm and a thickness of approximately 7–10 μm, without a sapphire substrate.

[0053] Each pixel is composed of the three primary colors: red, blue, and green (RGB). Each color on a pixel is called a subpixel. For example, a Micro LED display panel with a resolution of 480*270 has 270*(480*3) = 388,800 subpixels. Each subpixel on a Micro LED display panel corresponds to a subpixel circuit.

[0054] Please see Figure 2 , Figure 2 This is a schematic diagram of a sub-pixel circuit disclosed in an embodiment of this application. The sub-pixel circuit includes a passive driving circuit 201, an internal compensation circuit 202, and a light-emitting diode 203; the passive driving circuit 201 is connected to the internal compensation circuit 202, and the light-emitting diode 203 is connected to the internal compensation circuit 202.

[0055] The internal compensation circuit 202 includes a first data writing interface 204; the first data writing interface 204 is used to write a first data voltage; the passive drive circuit 201 includes a second data writing interface 206 and a sweep frequency signal writing interface 205; the second data writing interface 206 is used to write a second data voltage, and the sweep frequency signal writing interface 205 is used to receive a sweep frequency signal.

[0056] The passive drive circuit 201 is used to change the voltage at the connection point 207 between the passive drive circuit 201 and the internal compensation circuit 202 according to the second data voltage and the frequency sweep signal.

[0057] The internal compensation circuit 202 is used to turn on or off the path 208 between the first data write interface 204 and the light-emitting diode 203 according to the voltage of the connection point 207; when the path 208 is turned on, the light-emitting diode 203 emits light under the drive of the first data voltage; when the path 208 is turned off, the light-emitting diode 203 turns off.

[0058] Among them, the internal compensation circuit 202 can be as follows: Figure 1 The sub-pixel circuit shown has a 7T1C circuit structure, but the specific structure is not limited.

[0059] The first data voltage and the second data voltage are the data line voltages that drive the display panel to emit light. Different data line voltages will correspond to different brightness levels of the display panel.

[0060] The first data write interface 204 can be a circuit interface in the internal compensation circuit 202 used for reset, compensation, and writing, and can be used to write the first data voltage. Optionally, the first data write interface 204 can also be a port of an electronic device such as a switch or transistor, which can control when the first data voltage is written.

[0061] The first data voltage can adjust the brightness of the LED 203; the first data voltage can be 2V to 6V, and the specific value is not limited.

[0062] The light-emitting diode 203 can be a Micro LED with a size of about 50 micrometers (μm) * 50 μm.

[0063] The path 208 between the first data write interface 204 and the light-emitting diode 203 can include voltage-driven devices, such as field-effect transistors (MOSFETs) and insulated-gate bipolar transistors (IGBTs), etc., without specific limitations. Therefore, the conduction state of the path 208 can be determined based on the voltage at the connection point 207 between the passive drive circuit and the internal compensation circuit. The conduction state of the path 208 determines the light-emitting state of the light-emitting diode 203.

[0064] The second data voltage can be the data line voltage that drives the display panel to emit light. When the light-emitting diode 203 emits light, the second data voltage can affect the brightness of the light-emitting diode 203. The second data voltage can be 2 volts (V) to 6V, and there is no specific limitation.

[0065] A sweep frequency signal can be a signal whose frequency changes linearly within a defined range. The sweep frequency signal can be coupled with a second data voltage to obtain a variable voltage. Therefore, the voltage output by the passive drive circuit 201 to the internal compensation circuit 202 based on the second data voltage and the sweep frequency signal is variable. The passive drive circuit 201 can change the voltage at connection point 207, causing the internal compensation circuit 202 to control the light-emitting state of the LED 203 according to the voltage at connection point 207. In other words, by changing the voltage at connection point 207, the passive drive circuit 201 can indirectly control when the LED 203 lights up and when it turns off, thus controlling the duration of the LED's illumination.

[0066] As can be seen, the sub-pixel circuit of this application introduces a passive driving circuit, which enables the internal compensation circuit to switch the light emission state of the light-emitting diode according to the second data voltage and the sweep frequency signal input to the passive driving circuit. This allows the sub-pixel circuit to control the light emission duration of the light-emitting diode according to different grayscale display requirements, thereby improving the brightness uniformity of the display when displaying low grayscale, and solving the problems of grayscale loss and poor display when displaying low grayscale.

[0067] Please refer to further information. Figure 3 , Figure 3 This is a schematic diagram of another seed pixel circuit disclosed in an embodiment of this application.

[0068] The passive drive circuit 201 also includes a ninth thin-film transistor 301; the first electrode of the ninth thin-film transistor 301 is connected to the connection point 207, and the second electrode of the ninth thin-film transistor 301 is used to receive the input of the power supply voltage; the gate of the ninth thin-film transistor 301 is connected to the second data writing interface 206 and the sweep frequency signal writing interface 205 respectively; the gate voltage of the ninth thin-film transistor 301 changes under the coupling of the second data voltage and the sweep frequency signal.

[0069] Thin-film transistors (TFTs) are a type of insulated-gate field-effect transistor, which can be divided into n-type TFTs and p-type TFTs. The TFTs used in the embodiments of this application are all p-type TFTs. The working principle of a p-type TFT is as follows: when the gate voltage of the TFT is less than the turn-on voltage, the TFT is turned on; when the gate voltage is greater than the turn-on voltage, the TFT is turned off. The turn-on voltage is a device parameter of the TFT, specifically the gate voltage at which the source and drain of the TFT are just connected.

[0070] The first electrode and the second electrode of the ninth thin-film transistor 301 can represent the source and drain of the ninth thin-film transistor 301, respectively. In the embodiments of this application, the first electrode and the second electrode of each thin-film transistor can represent the source and drain of the thin-film transistor, respectively. Which of the first electrode and the second electrode is the source and which is the drain is not specifically limited.

[0071] The second electrode of the ninth thin-film transistor 301 is used to receive the input of the power supply voltage, which can be 3.3 volts or 5 volts, and is not specifically limited.

[0072] The ninth thin-film transistor 301 is used to turn off when the gate voltage is higher than the turn-on voltage of the ninth thin-film transistor 301; when the ninth thin-film transistor 301 is turned off, the voltage at connection point 207 is the first voltage.

[0073] The internal compensation circuit 202 is used to open the path 208 between the first data write interface 204 and the light-emitting diode 203 when the voltage at the connection point 207 is the first voltage.

[0074] The ninth thin-film transistor 301 is used to turn on when the gate voltage is lower than the turn-on voltage of the ninth thin-film transistor 301; when the ninth thin-film transistor 301 is turned on, the voltage at connection point 207 is the power supply voltage; the power supply voltage is higher than the first voltage.

[0075] The gate voltage of the ninth thin-film transistor 301 can be the voltage coupled between the second data voltage and the sweep signal. This coupled voltage is variable, and its value gradually decreases starting from the second data voltage. For example, the second data voltage is 4V, and the voltage coupled between the second data voltage and the sweep signal gradually decreases starting from 4V, meaning the gate voltage of the ninth thin-film transistor 301 gradually decreases starting from 4V. Assuming the turn-on voltage of the ninth thin-film transistor 301 is 0.8V, when the gate voltage of the ninth thin-film transistor 301 has not decreased below the turn-on voltage, the ninth thin-film transistor 301 is turned off. At this time, the voltage at the connection point 207 between the passive drive circuit 201 and the internal compensation circuit 202 is the first voltage.

[0076] The first voltage can be a low level below 0.5V, and there is no specific limitation.

[0077] When the gate voltage of the ninth thin-film transistor 301 decreases below the turn-on voltage, the ninth thin-film transistor 301 turns on, and the second electrode of the ninth thin-film transistor 301 can receive the input of the power supply voltage. At this time, the voltage of the connection point 207 will be pulled to the same voltage as the power supply voltage, that is, the voltage of the connection point 207 is the power supply voltage.

[0078] The power supply voltage can be a high level higher than 3V, and there is no specific limitation.

[0079] The internal compensation circuit 202 is used to cut off the path 208 between the first data write interface 204 and the light-emitting diode 203 when the voltage at the connection point 207 is the power supply voltage.

[0080] When the voltage at connection point 207 is the first voltage, the internal compensation circuit 202 can open the path 208 between the first data write interface 204 and the light-emitting diode 203. Optionally, the internal compensation circuit 202 can control the switching device on the path 208 by inputting a control signal, thereby controlling the opening or closing of the path 208. Alternatively, the internal compensation circuit 202 can control the opening or closing of the path 208 by a voltage-driven device on the path 208. Optionally, the voltage-driven device can close when the voltage at connection point 207 is the first voltage and open when the voltage at connection point 207 is the power supply voltage.

[0081] As can be seen, in this embodiment, the passive driving circuit switches the operating state of the ninth thin-film transistor through the second data voltage and the frequency sweep signal, so that the internal compensation circuit can directly and flexibly control the light-emitting state of the light-emitting diode according to the operating state of the ninth thin-film transistor. Therefore, the sub-pixel circuit can control the light-emitting duration of the light-emitting diode according to different gray-scale display requirements, thereby improving the brightness uniformity of the Micro LED display when displaying low gray-scale, and solving the problems of gray-scale loss and poor display when displaying low gray-scale.

[0082] In some embodiments, the sub-pixel circuit is connected to the controller 303; the controller 303 is used to input a first data voltage, a second data voltage, and a sweep frequency signal to the sub-pixel circuit.

[0083] The controller 303 can be the central processing unit (CPU) of electronic devices such as mobile phones, computers, and televisions, and is not specifically limited thereto. The controller 303 can input a first data voltage, a second data voltage, and a sweep frequency signal to the sub-pixel circuit in the display panel of the electronic device to switch the light emission state of the light-emitting diodes in the sub-pixel circuit, thereby adjusting the brightness, color, and other parameters of the display panel.

[0084] The passive drive circuit 201 also includes a twelfth thin-film transistor 302; the first electrode of the ninth thin-film transistor 301 is also connected to the first electrode of the twelfth thin-film transistor 302; the second electrode and gate of the twelfth thin-film transistor 302 are respectively connected to the controller 303.

[0085] The controller 303 is used to cut off the path between the passive drive circuit 201 and the internal compensation circuit 202, and to maintain the sweep frequency signal at a fixed level.

[0086] It should be noted that when the controller 303 cuts off the path between the passive drive circuit 201 and the internal compensation circuit 202, the light-emitting diode 203 is turned off and the sweep frequency signal is maintained at a fixed level, that is, the sweep frequency signal will not couple to the second data voltage.

[0087] The controller 303 is also used to detect the current flowing through the ninth thin film transistor 301 and the twelfth thin film transistor 302 through the second electrode of the twelfth thin film transistor 302 when the light-emitting diode 203 is off, and adjust the second data voltage written to the second data write interface 206 according to the current.

[0088] The second electrode and gate of the twelfth thin-film transistor 302 can be used to receive control signals sent by the controller 303 to switch the state.

[0089] The controller 303 is configured to increase the second data voltage written to the second data write interface 206 to a voltage preset value when the current flowing through the ninth thin film transistor 301 and the twelfth thin film transistor 302 is less than the current preset value.

[0090] When the LED 203 is off, the controller 303 inputs a control signal to the second electrode and gate of the twelfth thin-film transistor 302. After the twelfth thin-film transistor 302 is turned on according to the control signal, the controller 303 detects the current flowing through the ninth thin-film transistor 301 and the twelfth thin-film transistor 302 to detect the current driving capability of the ninth thin-film transistor 301. The current preset value can be the current value used to ensure that the ninth thin-film transistor 301 is in the optimal current driving capability. Therefore, if the current flowing through the ninth thin-film transistor 301 and the twelfth thin-film transistor 302 is less than the current preset value, it means that the second data voltage used to drive the ninth thin-film transistor 301 is less than the voltage preset value. In order to improve the driving capability of the ninth thin-film transistor, the second data voltage can be increased to the voltage preset value.

[0091] As can be seen, in the embodiment of this application, during the light-emitting diode 203's light-emitting and light-extinguishing processes, the ninth thin-film transistor 301 may experience voltage losses such as driving losses and conduction losses due to the switching of its working state and changes in current. Therefore, by introducing the twelfth thin-film transistor 302, the current driving capability of the ninth thin-film transistor 301 can be detected each time the light-emitting diode 203 is extinguished, and the second data voltage written to the second data writing interface 206 can be fed back and compensated, which can effectively improve the stability of the sub-pixel circuit.

[0092] Please refer to further information. Figure 4 , Figure 4 This is a schematic diagram of another seed pixel circuit disclosed in an embodiment of this application.

[0093] The sub-pixel circuit also includes an eighth thin-film transistor 401; a passive driving circuit 201 is connected to the first electrode of the eighth thin-film transistor 401, and an internal compensation circuit 202 is connected to the second electrode of the eighth thin-film transistor 401; the connection point between the passive driving circuit 201 and the internal compensation circuit 202 includes the connection point between the second electrode of the eighth thin-film transistor 401 and the internal compensation circuit 202; the gate of the eighth thin-film transistor 401 is used to receive control signals; the eighth thin-film transistor 401 switches different switching states according to the control signals;

[0094] When the eighth thin-film transistor 401 is in the on state, the path between the passive drive circuit 201 and the internal compensation circuit 202 is in the conducting state, and the light-emitting diode 203 emits light.

[0095] When the eighth thin-film transistor 401 is in the off state, the path between the passive drive circuit 201 and the internal compensation circuit 202 is cut off, and the light-emitting diode 203 is turned off.

[0096] The gate of the eighth thin-film transistor 401 can be used to receive a control signal sent by the controller to control the switching state of the eighth thin-film transistor. The eighth thin-film transistor 401 can switch between an on state and an off state according to the control signal. The light-emitting diode 203 can switch between emitting light and extinguishing light according to the switching state of the eighth thin-film transistor 401.

[0097] It should be noted that when the eighth thin-film transistor 401 is in the on state, it means that the current can be conducted between the first electrode and the second electrode of the eighth thin-film transistor 401; when the eighth thin-film transistor 401 is in the off state, it means that no current flows between the first electrode and the second electrode of the eighth thin-film transistor 401.

[0098] The eighth thin-film transistor 401 and the ninth thin-film transistor 301 can jointly control the light-emitting diode (LED) to light up or turn off. When the eighth thin-film transistor 401 is in the on state and the ninth thin-film transistor 301 is in the off state, the LED 203 lights up; when the eighth thin-film transistor 401 is in the on state and the ninth thin-film transistor 301 is also in the on state, the LED 203 turns off.

[0099] Therefore, the light-emitting process of LED 203 is as follows: The eighth thin-film transistor 401 is turned on, and the second data voltage makes the gate voltage of the ninth thin-film transistor 301 higher than the turn-on voltage, so the ninth thin-film transistor 301 is turned off. The voltage at the connection point 207 between the passive drive circuit 201 and the internal compensation circuit 202 is the first voltage, the path 208 is turned on, and LED 203 starts to emit light. The second data voltage is coupled with the sweep frequency signal, causing the gate voltage of the ninth thin-film transistor 301 to continuously decrease. When the gate voltage of the ninth thin-film transistor 301 is lower than the turn-on voltage, the ninth thin-film transistor 301 is turned on, and the voltage at the connection point 207 between the passive drive circuit 201 and the internal compensation circuit 202 is pulled to the same voltage as the power supply voltage, that is, the voltage at the connection point 207 is the power supply voltage. The path 208 is cut off, and LED 203 is turned off.

[0100] Therefore, the eighth thin-film transistor 401 is equivalent to a master switch, which determines the conduction state between the passive drive circuit 201 and the internal compensation circuit 202, and determines whether the light-emitting diode 203 can emit light; when the eighth thin-film transistor 401 is in the on state, the ninth thin-film transistor 301 is used to control the light-emitting duration of the light-emitting diode 203, and determines when the light-emitting diode 203 will turn off.

[0101] The passive drive circuit 201 also includes a tenth thin-film transistor 402 and a second capacitor 403; the second data writing interface 206 includes a first electrode of the tenth thin-film transistor 402, and the second electrode of the tenth thin-film transistor 402 is connected to the gate of the ninth thin-film transistor 301; one end of the second capacitor 403 is connected to the second electrode of the tenth thin-film transistor 402 and the gate of the ninth thin-film transistor 301 respectively; the sweep frequency signal writing interface 205 includes the other end of the second capacitor 403.

[0102] In this embodiment, the second data writing interface 206 includes a first electrode of a tenth thin-film transistor 402, which can be used to receive the second data voltage being written. The gate of the tenth thin-film transistor 402 can be used to receive a control signal input from a controller, and the tenth thin-film transistor 402 switches its switching state according to the control signal. The tenth thin-film transistor 402 can control when to receive the second data voltage being written based on different switching states.

[0103] The other end of the second capacitor 403 can be used to receive the input sweep frequency signal, and the second capacitor 403 can be used to store the sweep frequency signal.

[0104] The passive drive circuit 201 also includes an eleventh thin-film transistor 404; the internal compensation circuit 202 also includes a sixth thin-film transistor 106; the first electrode of the eleventh thin-film transistor 404 is connected to one end of the second capacitor 403 and the second electrode of the tenth thin-film transistor 402 respectively, the second electrode of the eleventh thin-film transistor 404 is connected to the first electrode of the sixth thin-film transistor 106, and the gate of the eleventh thin-film transistor 404 is connected to the gate of the sixth thin-film transistor 106; the second electrode of the sixth thin-film transistor 106 is connected to the connection point between the passive drive circuit 201 and the internal compensation circuit 202.

[0105] The connection between the eleventh thin-film transistor 404 and the sixth thin-film transistor 106 provides an additional current path between the passive drive circuit 201 and the internal compensation circuit 202. When the eighth thin-film transistor 401 is turned on and the ninth thin-film transistor 301 is turned off, the internal compensation circuit 202 can receive current from the passive drive circuit 201. The brightness of the light-emitting diode 203 is affected not only by the first data voltage but also by the second data voltage.

[0106] As can be seen, the embodiments of this application can drive the light-emitting diode to emit light through an internal compensation circuit and a passive driving circuit when the display panel displays low grayscale. The internal compensation circuit changes the brightness of the light-emitting diode, and the passive driving circuit changes the light-emitting duration of the light-emitting diode. This can improve the brightness uniformity of the Micro LED display when displaying low grayscale, and solve the problems of grayscale loss and poor display when displaying low grayscale.

[0107] Please refer to further information. Figure 5 , Figure 5 This is a schematic diagram of another seed pixel circuit disclosed in an embodiment of this application. The seed pixel circuit has a 12T2C structure, including 12 thin-film transistors and 2 capacitors. Figure 5 Each thin-film transistor is a p-type TFT. Therefore, the path 208 between the first data write interface 204 and the light-emitting diode 203 may include a third thin-film transistor 103 and a fifth thin-film transistor 105.

[0108] When both the eighth thin-film transistor 401 and the fifth thin-film transistor 105 are in the ON state, and the ninth thin-film transistor 301 is in the OFF state, the light-emitting diode 203 starts to emit light. Specifically, the gate of the fifth thin-film transistor 105 receives an enable signal from the controller. The fifth thin-film transistor switches its switching state according to the enable signal; when the enable signal causes the gate voltage of the fifth thin-film transistor to fall below the turn-on voltage, the fifth thin-film transistor turns on.

[0109] When the gate voltage of the ninth thin-film transistor 301 changes to below the turn-on voltage of the ninth thin-film transistor 301 under the coupling effect of the second data voltage and the sweep frequency signal, the ninth thin-film transistor 301 turns on. At this time, the connection point 207 between the passive drive circuit 201 and the internal compensation circuit 202 is pulled to the same voltage as the power supply voltage, that is, the voltage of the connection point 207 is the power supply voltage. The connection point 207 is connected to the gate of the third thin-film transistor 103, so the gate voltage of the third thin-film transistor 103 is also the power supply voltage. The third thin-film transistor 103 is in the off state and no current flows through it. Therefore, the light-emitting diode 203 does not emit light.

[0110] The first electrode of the first thin-film transistor 101 is connected to the first data writing interface, and the first thin-film transistor 101 can control when to write the first data voltage to the first data writing interface.

[0111] The gates of the first thin-film transistor 101, the second thin-film transistor 102, the fourth thin-film transistor 104, the fifth thin-film transistor 105, the sixth thin-film transistor 106, the seventh thin-film transistor 107, the eighth thin-film transistor 401, the tenth thin-film transistor 402, the eleventh thin-film transistor 404, and the twelfth thin-film transistor 302 can all be connected to the controller 303. The switching state of the aforementioned thin-film transistors can be determined according to the control signals sent by the controller 303 to each thin-film transistor. For example, the control signals may include a first turn-on signal, a second turn-on signal, an enable signal, a first detection control signal, a second detection control signal, etc., but are not limited to these.

[0112] As an optional implementation, the gates of the first thin-film transistor 101, the fourth thin-film transistor 104, and the tenth thin-film transistor 402 can be used to receive the same first turn-on signal sent by the controller 303; the gates of the sixth thin-film transistor 106, the seventh thin-film transistor 107, and the eleventh thin-film transistor 404 can be used to receive the same second turn-on signal sent by the controller 303; the gates of the second thin-film transistor 102 and the fifth thin-film transistor 105 can be used to receive the same enable signal sent by the controller 303; the gate of the eighth thin-film transistor 401 can be used to receive a control signal; the second electrode of the twelfth thin-film transistor 302 can be used to receive a first detection control signal sent by the controller 303, and the gate of the twelfth thin-film transistor 302 can be used to receive a second detection control signal sent by the controller 303.

[0113] like Figure 6 As shown, Figure 6This is a schematic diagram of a display panel structure disclosed in an embodiment of this application. The display panel is a 480*270 resolution MicroLED panel, with 270 rows and 1440 columns of sub-pixels 60, meaning there are 388,800 sub-pixels 60. Each sub-pixel 60 corresponds to a sub-pixel circuit. The sub-pixel circuit can be... Figures 2-5 Any of the aforementioned sub-pixel circuits. D1, D2, D3...D1438, D1439, D1440 represent each column of sub-pixel circuits. The first data write interface 204 in each row of sub-pixel circuits can share a common trace. The second data write interface 206 in each row of sub-pixel circuits can share a common trace. The gates of the first thin-film transistor 101, the fourth thin-film transistor 104, and the tenth thin-film transistor 402 used to receive the first turn-on signal in each row of sub-pixel circuits can share a common trace. G(1), G(2), G(3)...G(268), G(269), G(270) represent the first turn-on signal received by each row of sub-pixel circuits in the display panel. Since the gates of each first thin-film transistor 101, the fourth thin-film transistor 104, and the tenth thin-film transistor 402 in each row of sub-pixel circuits share a common trace, they can be used to receive the same first turn-on signal together. In other words, in each row of sub-pixel circuits, each first thin-film transistor 101 and tenth thin-film transistor 402 switches between states under the same first turn-on signal. Therefore, the controller 303 can write the first data voltage to the first thin-film transistor 101 and the second data voltage to the tenth thin-film transistor 402 in the same timing sequence.

[0114] like Figure 7 As shown, Figure 7 This is a schematic diagram illustrating the process of a passive driving circuit changing the emission duration of a sub-pixel, as disclosed in an embodiment of this application.

[0115] In some embodiments, the controller 303 is connected to a plurality of sub-pixel circuits; the controller 303 is configured to write different second data voltages to the second data write interface 206 of each sub-pixel circuit. The sub-pixel circuits may be... Figures 2-5 Any of the aforementioned sub-pixel circuits.

[0116] The passive drive circuit 201 starts working when the eighth thin-film transistor 401 is turned on. When the controller 303 writes different second data voltages (e.g., 4V, 5V, and 6V) to the second data write interface 206 of each sub-pixel circuit, since the turn-on voltage of the ninth thin-film transistor 301 in each sub-pixel circuit is consistent, the time when the gate voltage of the ninth thin-film transistor 301 in each sub-pixel circuit drops below the turn-on voltage under the coupling effect of the sweep frequency signal is different, that is, the time when the ninth thin-film transistor 301 turns off is different. Therefore, the time when the current through the light-emitting diode 203 is cut off is different, that is, the time when the light-emitting diode 203 is turned off is different. This allows control of the light-emitting duration of each sub-pixel circuit, enabling the sub-pixel circuit to control the light-emitting duration of the light-emitting diode according to different grayscale display requirements, thereby improving the brightness uniformity of the display when displaying low grayscale, and solving the problems of grayscale loss and display defects that occur when displaying low grayscale.

[0117] Please refer to further information. Figure 8 , Figure 8 This is a schematic diagram of the driving signals of a display panel within one frame, as disclosed in an embodiment of this application.

[0118] For example, the display panel can display one frame for 1 / 60th of a second. Within one frame, each sub-pixel circuit can include three stages: a "reset + compensation + data writing" stage, a "light emission" stage, and an "external detection" stage. Figure 8 As shown, G(1)~G(270) can represent the first turn-on signal received by each row of sub-pixel circuits in the display panel.

[0119] During the "reset + compensation + data writing" stage, G(1) to G(270) are the first voltage (low level) in sequence. For each row of sub-pixel circuits in the display panel, if the first turn-on signal is the first voltage, the first thin film transistor 101 and the tenth thin film transistor 402 in the sub-pixel circuit of that row are turned on. The controller can write the first data voltage to the first data writing interface 204 and the second data voltage to the second data writing interface 206.

[0120] During the entire "reset + compensation + data writing" phase, the enable signal EM and control signal Control input by the controller to each sub-pixel circuit are at a high level, which means that the second thin-film transistor 102, the fifth thin-film transistor 105, and the eighth thin-film transistor 401 are turned off.

[0121] Data1_1 to Data1_270 represent the first data voltages used for input to the first data write interface 204. Data2_1 to Data2_270 represent the second data voltages used for input to the second data write interface 206. During the "light emission" phase, the sweep signal gradually decreases and couples with the second data voltages to affect the switching state of the ninth thin-film transistor 301 in each sub-pixel circuit.

[0122] G_det(1-270) is the first detection control signal sent by the controller 303 to the second electrode of the twelfth thin-film transistor 302, and V_det(1-270) is the second detection control signal sent by the controller 303 to the gate of the twelfth thin-film transistor 302. Each sub-pixel circuit requires the twelfth thin-film transistor 302 to realize the current driving capability of the ninth thin-film transistor 301. For example... Figure 8 As shown, during the "external detection" phase before the end of a frame, the enable signal EM and the control signal Control are at the power supply voltage (high level), meaning that the fifth thin-film transistor 105 and the eighth thin-film transistor 401 are both off. The sweep signal Sweep maintains a fixed level, and the first detection control signal G_det and the second detection control signal V_det are at the first voltage (low level). The twelfth thin-film transistor 302 will then be turned on. The sweep signal Sweep maintaining a fixed level can be achieved as follows: Figure 8 The sweep signal Sweep is shown in the "external detection" phase.

[0123] Within one frame, when the twelfth thin-film transistor 302 is turned on, the controller 303 can select one row of sub-pixel circuits from the 270 rows of sub-pixel circuits to detect the current driving capability of the ninth thin-film transistor 301. The controller 303 selects a different row of sub-pixel circuits each frame, and can traverse each row of sub-pixel circuits after 270 frames. The controller 303 can randomly select one row of sub-pixel circuits each time, but the selected sub-pixel circuits are different in each of the 270 frames; alternatively, the controller 303 can select them sequentially.

[0124] In other words, the controller 303 randomly selects a set of second data voltages and first turn-on voltages from Data2(1~270) and G(1~270). For example, the second data voltage corresponding to the sub-pixel circuit to be detected is Data2_1, and the first turn-on voltage is G(1). After the twelfth thin-film transistor 302 is turned on, the first turn-on voltage G(1) is at a low level, and the tenth thin-film transistor 402 is in the on state. The controller inputs the second data voltage Data2_1 to the second data write interface 206. At this time, the detection current will flow through the ninth thin-film transistor 301 and the twelfth thin-film transistor 302 to the external controller 303 to detect the current driving capability, and feed back the corresponding current change to the voltage value of the second data voltage Data2_1. For example, if the detection current is less than the preset current value, that is, the driving capability of the ninth thin-film transistor 301 is insufficient, it is necessary to increase the voltage value of the second data voltage Data2_1 to the preset voltage value.

[0125] Please refer to further information. Figure 9 , Figure 9 This is a schematic diagram of another type of drive signal for a display panel within a frame, as disclosed in an embodiment of this application.

[0126] In some embodiments, the first data write interfaces 204 of each sub-pixel circuit are interconnected; the controller 303 is configured to simultaneously write a first data voltage to the first data write interfaces 204 of each sub-pixel circuit. The sub-pixel circuit may be... Figures 2-5 Any of the aforementioned sub-pixel circuits.

[0127] G1_1 to G1_270 are the first turn-on signals received by the gate of the first thin-film transistor 101 of the internal compensation circuit 202 in each row of sub-pixel circuit, and G2_1 to G2_270 are the first turn-on signals received by the gate of the tenth thin-film transistor 402 and the gate of the fourth thin-film transistor 104 of the passive driving circuit 201 in each row of sub-pixel circuit.

[0128] In some optional implementations, all G1_1 to G1_270 traces are merged, and all Data1_1 to Data1_270 traces are merged. That is, the first data write interfaces 204 of the internal compensation circuits 202 in each sub-pixel circuit are interconnected, and the gates of the first thin-film transistors 101 in each internal compensation circuit 202 are interconnected. Therefore, the internal compensation circuits 202 can achieve global light emission. At the beginning of a frame, the controller 303 performs a global reset, compensation, and data writing to the internal compensation circuits 202. That is, the controller 303 simultaneously writes the same first data voltage to each first data write interface 204, and then independently controls the light emission duration of each sub-pixel in each row of sub-pixel circuits of the display panel, that is, the light emission duration of each light-emitting diode, through the passive drive circuit 201. Therefore, the circuit layout and drive design can be simplified.

[0129] like Figure 9 As shown, all traces G1_1 to G1_270 are merged, and all traces Data1_1 to Data1_270 are merged. During the "reset + compensation + data writing" stage, the first thin-film transistor 101 of the internal compensation circuit 202 is turned on simultaneously, and the controller 303 simultaneously writes the same first data voltage to each first data writing interface 204, thereby adjusting the overall brightness of the display panel. Traces G2_1 to G2_270 and Data2_1 to Data2_270 are independent, meaning the controller still writes different second data voltages to the second data writing interface 206 of the passive drive circuit 201 in each row of sub-pixel circuits according to a sequential timing, thus controlling the light-emitting duration of each row of sub-pixels to be different.

[0130] In existing general designs, timing differences exist between G1_1 to G1_270 and between Data1_1 to Data1_270, making the driver design complex. Therefore, by merging the traces of G1_1 to G1_270 and Data1_1 to Data1_270, global illumination can be achieved through the internal compensation circuit 202. This simplifies the driver design and improves the efficiency of global internal compensation at the beginning of a frame. Thus, trace merging and driver simplification increase the layout design space, improving flexibility in circuit layout and driver design, while also simplifying chip design and reducing costs. While ensuring that the internal compensation circuit 202 drives each sub-pixel circuit to achieve global illumination, the passive driving circuit 201 adjusts the illumination duration of each sub-pixel circuit, which helps solve the problem of uneven brightness and addresses the grayscale loss and display defects that occur when displaying low grayscale levels in Micro LED displays.

[0131] In other alternative implementations, the controller can use different first data voltages for different grayscale values. For example, the grayscale values ​​can be divided into three grayscale value ranges: 0–32, 32–128, and 128–255. Using different first data voltages for different grayscale value ranges can achieve global illumination with varying brightness. For instance, a higher first data voltage can be used at low grayscale values, and a lower first data voltage can be used at high grayscale values. Furthermore, the passive drive circuit 201 adjusts the emission duration of each sub-pixel circuit by coupling a frequency sweep signal with a second data voltage. By designing different first data voltages for different grayscale value ranges and combining them with different second data voltages for each sub-pixel circuit, different brightness and emission duration of sub-pixels can be achieved across different grayscale value ranges, thereby improving the uniformity of microLED emission.

[0132] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0133] In the various embodiments of this application, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0134] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they can be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0135] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0136] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-accessible memory. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several requests to cause a computer device (which can be a personal computer, server, or network device, specifically a processor in the computer device) to execute some or all of the steps of the methods described in the various embodiments of this application.

[0137] Those skilled in the art will understand that all or part of the steps in the various methods of the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium capable of carrying or storing data.

[0138] The foregoing has provided a detailed description of a sub-pixel circuit disclosed in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A sub-pixel circuit, characterized in that, The sub-pixel circuit comprises a passive drive circuit, an internal compensation type circuit and a light emitting diode; the passive drive circuit is connected with the internal compensation type circuit; the light emitting diode is connected with the internal compensation type circuit; The internal compensation type circuit comprises a first data writing interface; the first data writing interface is used for writing a first data voltage; the passive drive circuit comprises a second data writing interface and a sweep signal writing interface; the second data writing interface is used for writing a second data voltage; the sweep signal writing interface is used for receiving a sweep signal; The passive drive circuit is used for changing the voltage of a connection point of the passive drive circuit and the internal compensation type circuit according to the second data voltage and the sweep signal; The internal compensation type circuit is used for turning on or cutting off a path between the first data writing interface and the light emitting diode according to the voltage of the connection point; When the path is turned on, the light emitting diode emits light under the drive of the first data voltage; When the path is cut off, the light emitting diode is extinguished; The passive drive circuit further comprises a ninth thin film transistor; a first electrode of the ninth thin film transistor is connected with the connection point; a second electrode of the ninth thin film transistor is used for receiving the input of a power voltage; a gate of the ninth thin film transistor is connected with the second data writing interface and the sweep signal writing interface respectively; the gate voltage of the ninth thin film transistor changes under the coupling of the second data voltage and the sweep signal; The ninth thin film transistor is used for being turned off when the gate voltage is higher than the turn-on voltage of the ninth thin film transistor; when the ninth thin film transistor is turned off, the voltage of the connection point is a first voltage; The internal compensation type circuit is used for turning on the path between the first data writing interface and the light emitting diode when the voltage of the connection point is the first voltage; The ninth thin film transistor is used for being turned on when the gate voltage is lower than the turn-on voltage of the ninth thin film transistor; when the ninth thin film transistor is turned on, the voltage of the connection point is the power voltage; the power voltage is higher than the first voltage; The internal compensation type circuit is used for cutting off the path between the first data writing interface and the light emitting diode when the voltage of the connection point is the power voltage.

2. The sub-pixel circuit of claim 1, wherein, The passive drive circuit further comprises a tenth thin film transistor and a second capacitor; the second data writing interface comprises a first electrode of the tenth thin film transistor; a second electrode of the tenth thin film transistor is connected with the gate of the ninth thin film transistor; one end of the second capacitor is connected with the second electrode of the tenth thin film transistor and the gate of the ninth thin film transistor respectively; the sweep signal writing interface comprises the other end of the second capacitor.

3. The sub-pixel circuit of claim 2, wherein, The passive drive circuit further comprises an eleventh thin film transistor; the internal compensation type circuit further comprises a sixth thin film transistor; a first electrode of the eleventh thin film transistor is connected with one end of the second capacitor and a second electrode of the tenth thin film transistor respectively, a second electrode of the eleventh thin film transistor is connected with a first electrode of the sixth thin film transistor, and a gate of the eleventh thin film transistor is connected with a gate of the sixth thin film transistor; and a second electrode of the sixth thin film transistor is connected with a connection point of the passive drive circuit and the internal compensation type circuit.

4. The sub-pixel circuit of claim 1, wherein, The sub-pixel circuit is connected with the controller; The controller is configured to input the first data voltage, the second data voltage and the sweep signal into the sub-pixel circuit.

5. The sub-pixel circuit of claim 4, wherein, The controller is connected with a plurality of sub-pixel circuits respectively; The controller is configured to write different second data voltages into the second data write interfaces of the sub-pixel circuits respectively.

6. The sub-pixel circuit of claim 4, wherein, The first data write interfaces of the sub-pixel circuits are connected with each other; The controller is configured to write the first data voltage into the first data write interfaces of the sub-pixel circuits simultaneously.

7. The sub-pixel circuit of claim 4, wherein, The passive drive circuit further comprises a twelfth thin film transistor; a first electrode of the ninth thin film transistor is further connected with a first electrode of the twelfth thin film transistor; a second electrode and a gate of the twelfth thin film transistor are connected with the controller respectively; The controller is configured to cut off a path between the passive drive circuit and the internal compensation type circuit, and maintain the sweep signal at a fixed level; The controller is further configured to detect a current flowing through the ninth thin film transistor and the twelfth thin film transistor through the second electrode of the twelfth thin film transistor when the light-emitting diode is turned off, and adjust the second data voltage written into the second data write interface according to the current.

8. The sub-pixel circuit of claim 7, wherein: The controller is configured to increase the second data voltage written into the second data write interface to a voltage preset value when the current flowing through the ninth thin film transistor and the twelfth thin film transistor is less than a current preset value.

9. The sub-pixel circuit of claim 1, wherein, The sub-pixel circuit further comprises an eighth thin film transistor; a first electrode of the eighth thin film transistor is connected with the passive drive circuit, and a second electrode of the eighth thin film transistor is connected with the internal compensation type circuit; a connection point of the passive drive circuit and the internal compensation type circuit comprises a connection point of the second electrode of the eighth thin film transistor and the internal compensation type circuit; a gate of the eighth thin film transistor is configured to receive a control signal; and the eighth thin film transistor switches different switch states according to the control signal; When the switch state of the eighth thin film transistor is an open state, a path between the passive drive circuit and the internal compensation type circuit is in a conducting state; When the switch state of the eighth thin film transistor is a closed state, the path between the passive drive circuit and the internal compensation type circuit is in a cut-off state.

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