Multi-drive pixel circuit and display device

Abstract

The application relates to a multi-drive pixel circuit and a display device, which comprises a drive module and a light-emitting control module, the light-emitting control module is connected with the drive module, and the light-emitting control module is used for connecting a light-emitting element. Wherein, the number of the drive modules is more than two, each drive module is used for connecting a display data signal and a voltage input signal, and adjusting a conduction state according to the display data signal. When the drive module is turned on, a drive signal is generated according to the display data signal and the voltage input signal, and the drive signal is transmitted to the light-emitting control module. The light-emitting control module is used for connecting a light-emitting control signal, and controlling the working state of the light-emitting element according to the light-emitting control signal and the drive signal. The multi-drive pixel circuit and the display device can improve the driving capacity of the pixel circuit and guarantee the normal working of the light-emitting element by setting the number of the drive modules to be more than two.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a multi-drive pixel circuit and a display device. BACKGROUND

[0002] At present, LED (Light Emitting Diode) display screens are widely used in military command, security display, commercial display and other fields due to their advantages of bright colors, wide dynamic range, high brightness, long service life, stable and reliable operation, etc.

[0003] Among them, the LED display screen is mainly composed of a plurality of light emitting diodes, and one light emitting diode is also called one pixel. In order to ensure the normal display of the LED display screen, a large current is usually required to be provided to each pixel to drive it to work normally. However, under the existing driving architecture, the driving capability often cannot meet the requirements, resulting in that the LED display screen cannot display normally. SUMMARY

[0004] Therefore, it is necessary to provide a multi-drive pixel circuit and a display device aiming at the above technical problems.

[0005] In a first aspect, the present application provides a multi-drive pixel circuit, comprising a driving module and a light emitting control module, the light emitting control module is connected to the driving module, the light emitting control module is used to connect a light emitting element, and the number of the driving module is two or more.

[0006] Each driving module is used to input a display data signal and a voltage input signal, and adjust the conduction state according to the display data signal; when the driving module is turned on, a driving signal is generated according to the display data signal and the voltage input signal, and the driving signal is transmitted to the light emitting control module;

[0007] The light emitting control module is used to input a light emitting control signal, and control the working state of the light emitting element according to the light emitting control signal and the driving signal.

[0008] In one embodiment, the driving module comprises a transmission unit and a driving unit, the transmission unit is connected to the driving unit, and the driving unit is connected to the light emitting control module. The transmission unit is used to input a display data signal and transmit the display data signal to the driving unit, and the driving unit is used to input a voltage input signal and generate a driving signal according to the display data signal and the voltage input signal, and transmit the driving signal to the light emitting control module.

[0009] In one embodiment, the driving unit comprises a driving switch tube and a storage capacitor, the control end of the driving switch tube is connected to the transmission unit, the two ends of the storage capacitor are respectively connected to the control end and the first end of the driving switch tube, and the second end of the driving switch tube is used to input a voltage input signal.

[0010] In one embodiment, the transmission unit includes a transmission switch transistor, the control terminal of which is used to receive external signals, the first terminal of which is connected to the drive unit, and the second terminal of which is used to receive display data signals.

[0011] In one embodiment, the multi-drive pixel circuit further includes a voltage reading module, which is connected to both the drive module and the light emission control module. The voltage reading module reads the threshold voltage of the drive module when the drive module is in a conducting state; the threshold voltage of the drive module is used to update the display data signal.

[0012] In one embodiment, the voltage reading module is also used to send a trigger signal to the drive module, the trigger signal being used to control the drive module to turn on.

[0013] In one embodiment, the multi-drive pixel circuit further includes an isolation module, the number of which matches the number of drive modules. Each drive module is connected to a voltage reading module through a different isolation module, and the isolation module is connected to an emissive control module.

[0014] In one embodiment, the isolation module includes an isolation switch transistor, the control terminal of which is used to receive a working control signal, the first terminal of which is connected to a voltage reading module, and the second terminal of which is connected to a drive module.

[0015] In one embodiment, the number of light-emitting control modules matches the number of isolation modules, and each light-emitting control module is connected to a different isolation module.

[0016] Secondly, this application provides a display device, including a light-emitting element and a multi-drive pixel circuit in any of the above embodiments.

[0017] The aforementioned multi-drive pixel circuit and driving device include a driving module and an emissive control module. The emissive control module is connected to the driving module and is used to connect to the emissive element. There are two or more driving modules, each used to receive display data signals and voltage input signals, and adjust its conduction state according to the display data signals. When the driving module is on, it generates a driving signal based on the display data signals and voltage input signals, and transmits the driving signal to the emissive control module. The emissive control module receives the emissive control signal and controls the operating state of the emissive element according to the emissive control signal and the driving signal. By setting the number of driving modules to two or more, and generating driving signals based on display data signals and voltage input signals when the driving modules are on, transmitting the driving signals to the emissive control module, and then controlling the operating state of the emissive element according to the emissive control signal and the driving signal, this multi-drive pixel circuit and display device can improve the driving capability of the pixel circuit and ensure the normal operation of the emissive element. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a multi-drive pixel circuit in one embodiment;

[0019] Figure 2 This is a schematic diagram of the multi-drive pixel circuit in another embodiment;

[0020] Figure 3 This is a schematic diagram of the structure of the multi-drive pixel circuit in another embodiment;

[0021] Figure 4 This is a schematic diagram of the structure of the multi-drive pixel circuit in another embodiment;

[0022] Figure 5 This is a schematic diagram of the multi-drive pixel circuit in another embodiment;

[0023] Figure 6 This is a schematic diagram of the structure of the multi-drive pixel circuit in another embodiment;

[0024] Figure 7 This is a schematic diagram of the structure of the multi-drive pixel circuit in another embodiment;

[0025] Figure 8 This is a timing diagram of the reading phase in one embodiment;

[0026] Figure 9 This is a timing diagram illustrating the display phase in one embodiment;

[0027] Figure 10 This is a schematic diagram of the multi-drive pixel circuit in another embodiment;

[0028] Figure 11This is a timing diagram of the reading phase in another embodiment;

[0029] Figure 12 This is a timing diagram showing the phase in another embodiment. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0031] In one embodiment, such as Figure 1 As shown, a multi-drive pixel circuit is provided, including a drive module 110 and a light-emitting control module 120. The light-emitting control module 120 is connected to the drive module 110 and is used to connect light-emitting elements. The number of drive modules 110 is two or more.

[0032] Each drive module 110 is used to receive display data signals and voltage input signals, and adjusts its conduction state according to the display data signals. Specifically, the control terminal of each drive module 110 can be used to receive display data signals, and the input terminal of each drive module 110 can be used to receive voltage input signals. The structure and type of each drive module 110 can be the same. For example, when each drive module 110 includes a drive switch transistor, the control terminal of the drive switch transistor in each drive module 110 can be used to receive display data signals, and the input terminal of the drive switch transistor can be used to receive voltage input signals. The display data signals and voltage input signals can be set according to the conduction conditions of the drive switch transistors.

[0033] After the driving module 110 is turned on, it can generate a driving signal based on the display data signal and the voltage input signal, and transmit the driving signal to the light-emitting control module 120. Since there can be two or more driving modules 110, each driving module 110 can generate a driving signal and transmit it to the light-emitting control module 120. The driving signal can be a current driving signal, thereby improving the current driving capability of the multi-drive pixel circuit.

[0034] The light-emitting control module 120 is used to receive light-emitting control signals. These signals can control the light-emitting control module 120 to be turned on or off. Optionally, when the light-emitting control signal turns the light-emitting control module 120 off, it can control the light-emitting element to not emit light. When the light-emitting control signal turns the light-emitting control module 120 on, it can control the light-emitting element to emit light according to the drive signals transmitted by the drive module 110. Specifically, the light-emitting control module 120 can transmit the drive signals from each drive module 110 to the light-emitting element, allowing the light-emitting element to adjust its brightness, color, etc., according to the drive signals.

[0035] The multi-drive pixel circuit in this embodiment includes a drive module 110 and a light-emitting control module 120. The light-emitting control module 120 is connected to the drive module 110 and is used to connect to the light-emitting element. There are two or more drive modules 110, each used to receive display data signals and voltage input signals, and adjust its conduction state according to the display data signals. When the drive module 110 is on, it generates a drive signal based on the display data signals and voltage input signals, and transmits the drive signal to the light-emitting control module 120. The light-emitting control module 120 receives the light-emitting control signal and controls the working state of the light-emitting element according to the light-emitting control signal and the drive signal. By setting the number of drive modules 110 to two or more, and generating drive signals based on display data signals and voltage input signals when the drive modules 110 are on, transmitting the drive signals to the light-emitting control module 120, and then controlling the working state of the light-emitting element according to the light-emitting control signal and the drive signal, this multi-drive pixel circuit improves the driving capability of the pixel circuit, thereby ensuring the normal operation of the light-emitting element.

[0036] In one embodiment, such as Figure 2 As shown, the driving module 110 includes a transmission unit 111 and a driving unit 112. The transmission unit 111 is connected to the driving unit 112, and the driving unit 112 is connected to the light emission control module 120.

[0037] Each driving module 110 may include a transmission unit 111 and a driving unit 112. The transmission unit 111 and the driving unit 112 may have the same structure and type to reduce the influence between the driving modules 110 and ensure the normal operation of the multi-drive pixel circuit. Each transmission unit 111 is used to receive display data signals. When the transmission unit 111 is working, it can transmit the display data signals to the corresponding driving unit 112.

[0038] In addition, each transmission unit 111 can be connected to different external signals, and each external signal is used to control the working state of the corresponding transmission unit 111. Specifically, when the driving module 110 includes a first driving module and a second driving module, the transmission unit 111 of the first driving module can be connected to a first external signal, and the transmission unit 111 of the second driving module can be connected to a second external signal. The first external signal and the second external signal can control the working state of the transmission unit 111 of the first driving module and the transmission unit 111 of the second driving module, respectively. For example, when the first external signal controls the transmission unit 111 of the first driving module to work, and the second external signal controls the transmission unit 111 of the second driving module to not work, the display data signal can only be transmitted to the driving unit 112 of the first driving module through the transmission unit 111 of the first driving module. Therefore, by connecting different external signals, each transmission unit 111 can transmit the display data signal to the designated driving unit 112, thereby controlling the number of driving modules 110 that are actually working. Under the premise of ensuring that the light-emitting element emits light normally, the service life of the driving module 110 can be extended.

[0039] The driving unit 112 is used to receive a voltage input signal. After receiving the display data signal, the driving unit 112 can control the driving unit 112 to turn on. After the driving unit 112 is turned on, it can generate a driving signal based on the display data signal and the voltage input signal, and transmit the driving signal to the light-emitting control module 120. The driving signal can be a current driving signal to improve the current driving capability of the multi-drive pixel circuit.

[0040] In this embodiment, the driving module 110 includes a transmission unit 111 and a driving unit 112, with the transmission unit 111 connected to the driving unit 112. The transmission unit 111 receives display data signals and transmits them to the driving unit 112. The driving unit 112 receives voltage input signals, generates driving signals based on the display data signals and the voltage input signals, and transmits the driving signals to the light-emitting control module 120. By controlling the operating state of the transmission unit 111, it is possible to control whether the driving unit 112 receives display data signals, thereby controlling the number of driving modules 110 actually operating. This extends the lifespan of the driving modules 110 while ensuring the normal operation of the light-emitting elements.

[0041] In one embodiment, such as Figure 3 As shown, the driving unit 112 includes a driving switch transistor and a storage capacitor. The control terminal of the driving switch transistor is connected to the transmission unit 111, and the two ends of the storage capacitor are respectively connected to the control terminal and the first terminal of the driving switch transistor. The second terminal of the driving switch transistor is used to receive a voltage input signal.

[0042] Specifically, when the transmission unit 111 is working, the display data signal can be transmitted to the control terminal of the driving switch transistor via the transmission unit 111, and the display data signal can be stored in the storage capacitor. When the driving switch transistor is working, the driving switch transistor can generate a driving signal based on the voltage input signal and the display data signal stored in the storage capacitor, and transmit the driving signal to the light-emitting control module 120. For example, when the driving switch transistor is a driving transistor, the control terminal of the driving switch transistor can be the gate of the driving transistor, used to connect the display data signal. The first terminal of the driving switch transistor can be the drain of the driving transistor. The two ends of the storage capacitor are connected to the gate and drain of the driving transistor, respectively. The second terminal of the driving switch transistor can be the source of the driving transistor, used to connect the voltage input signal. The current driving signal I output by the driving transistor can be calculated according to the formula (1) for solving the output current of the driving transistor.

[0043] I = K(Vgs - Vth) 2 (1)

[0044] Where K is the mobility of the driving transistor, Vgs is the gate-source voltage of the driving transistor, and Vth is the threshold voltage of the driving transistor. The current driving signal I = K(Vdata - VDD - Vth) can be calculated using formula (1). 2 Vdata represents the display data signal, and VDD represents the voltage input signal.

[0045] It is understood that when there are two or more drive modules 110, the current drive signal output by the drive unit 112 in each drive module 110 can be calculated using the above formula. The current drive signals output by each drive module 110 can be accumulated and then transmitted to the light-emitting control module 120. When the light-emitting control module 120 is working, it can transmit the accumulated current drive signal to the light-emitting element to drive the light-emitting element to emit light.

[0046] In this embodiment, the driving unit 112 includes a driving switch transistor and a storage capacitor. The control terminal of the driving switch transistor is connected to the transmission unit 111, and the two ends of the storage capacitor are respectively connected to the control terminal and the first terminal of the driving switch transistor. The second terminal of the driving switch transistor is used to receive a voltage input signal. The storage capacitor can store display data signals, ensuring the driving switch transistor can operate normally. Furthermore, having two or more driving switches can improve the current driving capability of the multi-drive pixel circuit, thereby ensuring the normal emission of the light-emitting element.

[0047] In one embodiment, such as Figure 3 As shown, the transmission unit 111 includes a transmission switch transistor. The control terminal of the transmission switch transistor is used to receive external signals, the first terminal of the transmission switch transistor is connected to the drive unit 112, and the second terminal of the transmission switch transistor is used to receive display data signals.

[0048] External signals can be used to control the on / off state of the transmission switch transistor. For example, the external signal can be a high-level signal or a low-level signal. When the external signal is high, the transmission switch transistor is turned on. When the external signal is low, the transmission switch transistor is turned off. Specifically, when there are two or more drive modules 110, the control terminals of the transmission switch transistors in each drive module 110 can be connected to different external signals. Each external signal can control the on / off state of its corresponding transmission switch transistor, thereby controlling the transmission of display data signals to the actually operating drive module 110, reducing the pressure time of the remaining drive modules 110, and extending the service life of the drive modules 110.

[0049] Specifically, when the transmission switch is turned on, the display data signal can be transmitted to the drive unit 112 via the transmission switch. In particular, when the transmission switch is a transmission transistor, the control terminal of the transmission switch can be the gate, the first terminal can be the drain, and the second terminal can be the source.

[0050] In this embodiment, the transmission unit 111 includes a transmission switch transistor. The control terminal of the transmission switch transistor is used to receive external signals. The first terminal of the transmission switch transistor is connected to the drive unit 112, and the second terminal is used to receive display data signals. By controlling the transmission switch transistor to turn on or off via external signals, the display data signals can be controlled to be transmitted to the drive modules 110 that need to operate, thereby reducing the stress time on the other drive modules 110 and extending their service life.

[0051] In one embodiment, such as Figure 4 As shown, the multi-drive pixel circuit also includes a voltage reading module 130, and the drive module 110 and the light emission control module 120 are all connected to the voltage reading module 130.

[0052] The voltage reading module 130 is used to read the threshold voltage of the drive module 110 when the drive module 110 is in the ON state. Specifically, when the drive module 110 is ON, the voltage input signal can charge the drive module 110 until the drive module 110 is OFF. After the drive module 110 is OFF, the voltage reading module 130 can connect to an external sampling signal to read the threshold voltage of the drive module 110.

[0053] For example, when the driving module 110 includes a driving switch and a storage capacitor, the control terminal of the driving switch can be used to connect to a display data signal, and the second terminal of the driving switch can be used to connect to a voltage input signal. The two ends of the storage capacitor can be connected to the first and second terminals of the driving switch, respectively. The display data signal can be a preset potential signal Vdata, which makes the driving switch meet the conduction condition. When the display data signal controls the driving switch to conduct, the voltage input signal can charge the storage capacitor through the driving switch until the driving switch is turned off. When the potential of the first terminal of the driving switch is Vdata-Vth, the driving switch is turned off. At this time, the voltage reading module 130 can read the potential Vdata-Vth of the first terminal of the driving switch. Here, Vth represents the threshold voltage of the driving switch. Since the value of Vdata is known, the threshold voltage Vth of the driving module 110 can be calculated by reading the potential Vdata-Vth. In particular, when the driving switch is a driving transistor, the control terminal of the driving switch can be the gate of the driving transistor, and the first and second terminals of the driving switch can be the source and drain of the driving transistor, respectively.

[0054] After the voltage reading module 130 reads the threshold voltage of the driving module 110, it can update the display data signal. Specifically, the updated display data signal value can be the sum of the display voltage and the compensation voltage. The display voltage is used to control the light-emitting element to emit light, and the compensation voltage value is equal to the threshold voltage value of the driving module 110, used to compensate for the threshold voltage of the driving module 110, so that the output current of the driving module 110 is not affected by the threshold voltage. For example, based on the above, when the driving module 110 includes a driving switch and a storage capacitor, and the driving switch is a driving transistor, the updated display data signal can be transmitted to the gate of the driving transistor and stored in the storage capacitor. When the light-emitting control module 120 is working, the output current I of the driving module 110 can be calculated according to formula (1): I = K(Vg - Vs - Vth). 2 =K[(Vdata+Vth)-Vs-Vth] 2 =K(Vdata-Vs) 2 Where K represents the mobility of the driving transistor, Vd ata represents the display voltage, Vth represents the threshold voltage of the driving transistor, and Vs represents the source voltage of the driving transistor. Therefore, by compensating the threshold voltage of the driving module 110 with a compensation voltage, the output current of the driving module 110 is not affected by the threshold voltage, thus improving the current driving capability of the multi-drive pixel circuit.

[0055] In this embodiment, the multi-drive pixel circuit further includes a voltage reading module 130, which is connected to both the drive module 110 and the light emission control module 120. The voltage reading module 130 reads the threshold voltage of the drive module 110 when the drive module 110 is in the ON state. The threshold voltage of the drive module 110 is used to update the display data signal. The updated display data signal can compensate for the threshold voltage of the drive module 110, so that the output current of the drive module 110 is not affected by the threshold voltage, thereby improving the current driving capability of the multi-drive pixel circuit.

[0056] In one embodiment, the voltage reading module 130 is further configured to send a trigger signal to the drive module 110, the trigger signal being used to control the drive module 110 to turn on.

[0057] Specifically, after the display data signal is transmitted to the driver module 110, the voltage reading module 130 can send a trigger signal to the driver module 110 after a preset time interval. The potential of the trigger signal is lower than that of the display data signal, allowing the driver module 110 to turn on more quickly. Additionally, one end of each driver module 110 can be connected to a common terminal, which is then connected to the light-emitting control module 120. When the multi-drive pixel circuit also includes the voltage reading module 130, the common terminal of each driver module 110 is also connected to the voltage reading module 130 to save hardware resources. Each driver module 110 can also be connected to a different light-emitting control module 120 to reduce interference between the driver modules 110.

[0058] Specifically, when the drive module 110 includes a first drive module and a second drive module, the first drive module includes a first drive switch, the second drive module includes a second drive switch, and the first terminals of the first and second drive switches are connected to a common terminal, after reading the threshold voltage of the first drive switch, the potential of the first terminal of the first drive switch is raised to Vdata-Vth1, where Vth1 represents the threshold voltage of the first drive switch. Therefore, the potential of the first terminal of the second drive switch will also be raised to Vdata-Vth1, causing the second drive switch to fail to conduct normally. At this time, the voltage reading module 130 can send a trigger signal to the second drive switch after reading the threshold voltage of the first drive switch, so that the second drive switch can conduct normally.

[0059] In this embodiment, the voltage reading module 130 is also used to send a trigger signal to the drive module 110. The trigger signal is used to control the drive module 110 to be turned on, which can ensure that the drive module 110 works normally.

[0060] In one embodiment, such as Figure 5As shown, the multi-drive pixel circuit also includes an isolation module 140. The number of isolation modules 140 can be matched with the number of drive modules 110. Each drive module 110 is connected to the voltage reading module 130 through a different isolation module 140, and the isolation module 140 is connected to the light emission control module 120.

[0061] When the isolation module 140 is operational, the voltage reading module 130 can read the threshold voltage of the drive module 110. The specific steps include: pre-setting the value of the display data signal to meet the conduction conditions of the drive module 110; after the drive module 110 is turned on, the voltage input signal charges the drive module 110 until it is turned off; after the drive module 110 is turned off, the isolation module 140 is turned on, and the voltage reading module 130 can read the voltage of the drive module 110 through the isolation module 140. Then, the threshold voltage of the drive module 110 can be calculated based on the pre-set value of the display data signal.

[0062] Furthermore, since each drive module 110 is connected to the voltage reading module 130 via a different isolation module 140, when reading the threshold voltage of each drive module 110, the voltage reading module 130 does not need to send a trigger signal to the next drive module 110 to enable it to conduct normally after reading the threshold voltage of the previous drive module 110. This improves the efficiency of the voltage reading module 130 in reading the threshold voltage.

[0063] In this embodiment, the multi-drive pixel circuit further includes an isolation module 140. The number of isolation modules 140 matches the number of drive modules 110. Each drive module 110 is connected to the voltage reading module 130 through a different isolation module 140, and the isolation module 140 is connected to the light emission control module 120. By setting the isolation modules 140 to keep each drive module 110 independent, the influence between the drive modules 110 can be reduced. Furthermore, when the voltage reading module 130 reads the threshold voltage of each drive module 110, it is not necessary to send a trigger signal to control the drive module 110 to turn on, thus improving the efficiency of the voltage reading module 130 in reading the threshold voltage.

[0064] In one embodiment, such as Figure 6 As shown, the isolation module 140 includes an isolating switch. The control terminal of the isolating switch is used to receive the working control signal. The first terminal of the isolating switch is connected to the voltage reading module 130, and the second terminal of the isolating switch is connected to the drive module 110.

[0065] The operating control signal is used to control the switching on or off of the isolating switch transistor, and can be a high or low level signal. When each drive module 110 is connected to the voltage reading module 130 through a different isolating switch transistor, each isolating switch transistor can be controlled by a different operating control signal.

[0066] Specifically, when the operating control signal controls the isolating switch to turn on, the voltage reading module 130 can read the threshold voltage of the drive module 110. The specific reading process can be found in the above embodiment. When the operating control signal controls the isolating switch to turn off, the voltage reading module 130 cannot read the threshold voltage of the drive module 110 connected to the isolating switch. Therefore, the operating control signal can be used to enable the voltage reading module 130 to read the threshold voltage of the actually operating drive module 110 for threshold voltage compensation.

[0067] Specifically, when the drive module 110 includes a transmission switch, the control terminal of the transmission switch can also be connected to a working control signal. In this case, the working control signal can control the transmission switch and the isolation switch to be turned on or off simultaneously.

[0068] In this embodiment, the isolation module 140 includes an isolation switch transistor. The control terminal of the isolation switch transistor is used to connect to a working control signal. The working control signal can be used to control the opening or closing of the isolation switch transistor, thereby controlling the voltage reading module 130 to read the threshold voltage of the specified drive module 110. This improves the reading efficiency of the voltage reading module 130 and reduces the time that the unread drive module 110 is subjected to voltage, thus extending the service life of the drive module 110.

[0069] In one embodiment, such as Figure 6 As shown, the number of light-emitting control modules 120 matches the number of isolation modules 140. Each light-emitting control module 120 is connected to a different isolation module 140.

[0070] The number of light-emitting control modules 120 is matched with the number of isolation modules 140, meaning one light-emitting control module 120 is connected to one isolation module 140. For example, as... Figure 6 As shown, when the light-emitting control module 120 includes a light-emitting control switch and the isolation module 140 includes an isolation switch, the control terminal of the light-emitting control switch can be used to receive a light-emitting control signal, the first terminal of the light-emitting control switch can be connected to the first terminal of the isolation switch, and the second terminal of the light-emitting control switch can be used to connect to a light-emitting element. The control terminal of the isolation switch can be used to receive a working control signal, and the second terminal of the isolation switch can be used to connect to the voltage reading module 130. Furthermore, when the number of isolation modules 140 matches the number of drive modules 110, each drive module 110 can be connected to one isolation module 140 and one light-emitting control module 120. Each light-emitting control module 120 can first be connected to a common connection point, which in turn connects to a light-emitting element, allowing the light-emitting element to receive drive signals from multiple drive modules 110, further improving the driving capability of the multi-drive pixel circuit.

[0071] In this embodiment, the number of light-emitting control modules 120 matches the number of isolation modules 140, and each light-emitting control module 120 is connected to an isolation module 140. This ensures that the connection structure of each driving module 110 in the multi-drive pixel circuit is identical, reducing the influence between the driving modules 110 and guaranteeing the normal operation of the multi-drive pixel circuit.

[0072] In one embodiment, a display device is provided, including a light-emitting element and a multi-drive pixel circuit of any of the above embodiments.

[0073] Each light-emitting element in the display device can be connected to a multi-drive pixel circuit in any of the above embodiments. Furthermore, each multi-drive pixel circuit can be connected to different control signals. Each control signal can control the number of actually operating drive modules 110 in its corresponding multi-drive pixel circuit, while ensuring the light-emitting element emits light normally, thereby reducing the voltage exposure time of the remaining drive modules 110 and extending the lifespan of the multi-drive pixel circuit.

[0074] To facilitate understanding, a more detailed specific embodiment is provided below.

[0075] In one embodiment, such as Figure 7 As shown, a multi-drive pixel circuit is provided, including a drive module 110 and a light-emitting control module 120, wherein the number of drive modules 110 is n. Each drive module 110 includes a transmission unit 111 and a drive unit 112. The transmission unit 111 includes a transmission transistor, and the drive unit 112 includes a drive transistor and a storage capacitor. The light-emitting control module 120 includes a light-emitting control transistor TFT_EM. The multi-drive pixel circuit also includes a voltage readout module 130, which includes a voltage readout transistor TFT_RD.

[0076] In this configuration, the gate of each transmission transistor is used to connect to a different external signal; for example, the gate of transmission transistor T1 can be used to connect to the external signal Gate1. The drain of each transmission transistor is used to connect to the Data signal, and the source of each transmission transistor T is connected to the gate of the respective driving transistor. The source of the voltage readout transistor TFT_RD and the source of the light emission control transistor TFT_EM are both connected to the source of the respective driving transistor, and the drain of each driving transistor is used to connect to the voltage input signal. Specifically, this voltage input signal can be a positive voltage input signal VDD. The two ends of each storage capacitor are connected to the gate and source of the corresponding driving transistor, respectively.

[0077] The gate of the voltage readout transistor TFT_RD is used to connect to the switch signal RD_G, which controls the TFT_RD to turn on or off. The drain of the TFT_RD is used to connect to an external sample module. The external sample module includes a Ref unit and a Read unit. The Ref unit can be controlled by a Sw_Ref switch, and the Read unit can be controlled by a Sw_Samp switch. Specifically, with the TFT_RD on, when the Sw_Ref switch is closed, the external sample module can send a trigger signal Ref to each driving transistor, which controls the driving transistors to turn on. When the Sw_Samp switch is closed, the external sample module can read the threshold voltage of each driving transistor through the sampling signal sample. The Ref unit can be a digital-to-analog converter, and the Read unit can be an analog-to-digital converter.

[0078] The gate of the light-emitting control transistor TFT_EM is used to receive the light-emitting control signal EM, and the drain of the TFT_EM is used to connect to the anode of the light-emitting element. The cathode of the light-emitting element is used to receive the negative voltage input signal VSS. The light-emitting element can be a MiniLED or a MicroLED.

[0079] For this multi-drive pixel circuit, a working control method is also provided, the specific steps of which are as follows:

[0080] 1. The timing diagram for the reading phase is as follows: Figure 8As shown: Throughout the entire read phase, EM is at a low level, TFT_EM is off, and Data is at a high level. The read phase is divided into read phases 1 to n. In read phase 1, Gate1 and RD_G go high, T1 is turned on, and Data is written. After a short interval, Sample sends a high-level pulse Ref, which is lower than Data, allowing DTFT1 to meet the turn-on condition. Then, VDD charges capacitor C1 through DTFT1. When the source potential of DTFT1 is Vdata-Vth1, DTFT1 is turned off. Here, Vdata represents the display voltage, and Vth1 represents the threshold voltage of DTFT1. At this time, the external sample module samples the source potential of DTFT1 by controlling the Sw_Samp switch to close, reading the potential Vdata-Vth1. Subsequently, Gate1 and RD_G go low, and read phase 1 ends. Then, in reading phase 2, Gate2 and RD_G go high, T2 is turned on, and Data is written. After a short interval, the external sample module sends a high-level pulse Ref, which is lower than Data. This is because in the previous phase, the source potential of DTFT1 was raised to potential Vdata-Vth1. In order for DTFT2 to turn on, its source needs a lower potential to meet the turn-on condition. After DTFT2 turns on, VDD charges capacitor C2 through DTFT2. When the source potential of DTFT2 is Vdata-Vth2, DTFT2 is turned off. At this time, the external sample module samples the source potential of DTFT2 by controlling the Sw_Samp switch to close, reading the potential Vdata-Vth2. Here, Vth2 represents the threshold voltage of DTFT2. Subsequently, Gate2 and RD_G go low, and reading phase 2 ends. This process continues until the Vth of DTFTn is read. The reading phase ends.

[0081] 2. The timing diagram for the display phase is as follows: Figure 9As shown, the process includes a data writing stage and a light-emitting stage. First, in the data writing stage, RD_G remains low, and TFT_RD remains off. This stage is divided into data writing stages 1 through n. In data writing stage 1, Gate1 is high, and the Data potential is the display data of the frame plus the threshold voltage of DTFT1, which is Vdata + Vth1, stored in C1. Then, in data writing stage 2, Gate2 is high, and the Data potential is the display data of the frame plus the threshold voltage of DTFT2, which is Vdata + Vth2, stored in C2. This continues until the display data Vdata + Vthn of DTFTn is stored in Cn. Then, in the light-emitting stage, all Gate signals are low, EM becomes high, TFT_EM turns on, forming a current path, and the light-emitting element emits light. At this time, the current on the light-emitting element is the sum of the currents of all current branches, I1 + I2 + I3 + ... + In. Wherein, the current of any i-th current branch is Ii. ＝ K(Vgs-Vthi) 2 =K[(Vdata+Vthi)-(VSS+Vf)-Vthi] 2 =K(Vdata-VSS-Vf) 2 Where Vf is the operating voltage of the light-emitting element. Therefore, the threshold voltage of each driving transistor is compensated, and the output current is independent of Vth. In practical applications, those skilled in the art can select the number of driving transistors that actually operate based on the magnitude of the operating current of the light-emitting element; the Data signal of inactive driving transistors can be directly written as 0V.

[0082] Furthermore, to further reduce the design complexity of external sample modules, this embodiment also provides a multi-drive pixel circuit based on the above, such as... Figure 10 As shown, the multi-drive pixel circuit includes an isolation module 140, and the external sample module only needs to include a Read unit. The isolation module 140 includes isolation transistors, the number of which matches the number of drive transistors. The light-emitting control module 120 includes multiple light-emitting control transistors, the number of which matches the number of isolation transistors, and each light-emitting control transistor is connected to a different isolation transistor. The gate of each isolation transistor is used to connect to an external signal, the source of each isolation transistor is connected to the drain of the voltage read transistor, and the drains of both the light-emitting control transistors and the sources of the drive transistors are connected to the drains of the isolation transistors. The source of each light-emitting control transistor is used to connect to the anode of the light-emitting element.

[0083] A working control method is also provided for this multi-drive pixel circuit, and the specific steps are as follows:

[0084] 1. The timing diagram for the reading phase is as follows:Figure 11 As shown, during the entire read phase, EM is at a low level, all light-emitting control transistors are off, and Data is at a high level. The read phase is divided into read phases 1 to n. In read phase 1, Gate1 and RD_G become high, T1 is turned on, and Data is written. Data is a high potential, which allows DTFT1 to meet the turn-on condition. After DTFT1 is turned on, VDD charges capacitor C1 through DTFT1. When the source potential of DTFT1 is Vdata-Vth1, DTFT1 is turned off. At this time, the external sample module reads the potential Vdata-Vth1 through sampling. Subsequently, Gate1 and RD_G become low, and read phase 1 ends. Then, read phase 2 begins. Gate2 and RD_G become high, T2 is turned on, and Data is written. Since the source of DTFT1 is separated by TFT_EM1 and TFT_G1, the potential of the source of DTFT2 does not change after read phase 1, and the writing of Data allows DTFT2 to meet the turn-on condition. After DTFT2 is turned on, VDD charges capacitor C2 through DTFT2. When the source potential of DTFT2 is Vdata-Vth2, DTFT2 is turned off. At this time, the external sample module reads the potential Vdata-Vth2 through sampling. Subsequently, Gate2 and RD_G go low, and the reading phase 2 ends. This process continues until Vthn of DTFTn is read. The reading phase ends.

[0085] 2. Display phase sequence diagram as follows Figure 12 As shown, the working principle is as follows: First, there is the data writing stage. During this stage, RD_G is always low, and TFT_RD is always off. This stage is divided into data writing stages 1 to n. In data writing stage 1, Gate1 is high, and the Data potential is the display data of this frame plus the threshold voltage of DTFT1, which is Vdata + Vth1, stored in C1. Then, in data writing stage 2, Gate2 is high, and the Data potential is the display data of this frame plus the threshold voltage of DTFT2, which is Vdata + Vth2, stored in C2. This continues until the display data Vdata + Vthhn of DTFTn is stored in Cn.

[0086] Then, the light-emitting stage begins. All Gate signals are low, EM goes high, and all light-emitting control transistors turn on, forming n current paths, causing the LED to emit light. At this time, the current on the LED is the sum of the currents in all current branches, which is I1 + I2 + I3 + ... + In. The current in any i-th current branch is Ii = K(Vgs - Vthi). 2 =K[(Vdata+Vthi)-(VSS+Vf)-Vthi] 2=K(Vdata-VSS-Vf) 2 The threshold voltage of each driving transistor is compensated, and the output current is independent of Vth. In practical applications, those skilled in the art can select the number of driving transistors that actually operate based on the magnitude of the operating current of the light-emitting element. The Data signal of the unoperated driving transistors can be directly written as 0V.

[0087] In this embodiment, the multi-drive pixel circuit includes a drive module 110, a light-emitting control module 120, and a voltage reading module 130. The number of drive modules 110 is two or more, and each drive module 110 includes a drive transistor, a storage capacitor, and a transmission transistor. The light-emitting control module 120 includes a light-emitting control transistor, and the voltage reading module 130 includes a voltage reading transistor TFT_RD, which can compensate for the threshold voltage of the drive transistors. This multi-drive pixel circuit includes multiple drive transistors, improving the circuit's current driving capability. Furthermore, when controlling the light-emitting element to emit light, by writing the display data signal Data as Vdata+Vthn, the threshold voltage of each drive transistor can be compensated, reducing the impact of threshold voltage on performance instability. Additionally, by setting an isolation module 140 to isolate the potentials of each drive module 110, the design complexity of the external sample module can be reduced, improving the driving efficiency of the multi-drive pixel circuit. Simultaneously, by controlling the value of the written display data Data, the number of drive transistors to be used can be selected in real time, reducing the voltage exposure time of inactive drive transistors and further improving the lifespan of the multi-drive pixel circuit.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A multi-drive pixel circuit, characterized in that, The system includes a driving module, a light-emitting control module, a voltage reading module, and an isolation module. The number of isolation modules matches the number of driving modules. Each driving module is connected to a voltage reading module through a different isolation module. The light-emitting control module is connected to the driving module, and the isolation modules are connected to the light-emitting control module. The light-emitting control module is used to connect a light-emitting element. There are two or more driving modules. Each isolation module includes an isolation switch. The control terminal of the isolation switch is used to receive a working control signal. The first terminal of the isolation switch is connected to the voltage reading module, and the second terminal of the isolation switch is connected to the driving module. Each of the aforementioned driving modules is used to receive display data signals and voltage input signals, and adjust the conduction state according to the display data signals; when the driving module is on, it generates a driving signal according to the display data signals and the voltage input signals, and transmits the driving signal to the light-emitting control module; The light-emitting control module is used to receive the light-emitting control signal and control the working state of the light-emitting element according to the light-emitting control signal and the driving signal; The voltage reading module is used to read the threshold voltage of the driving module when the driving module is in the on state; the threshold voltage of the driving module is used to update the display data signal. The isolation module is used to isolate the potential of a certain driving module from the potentials of other driving modules when the voltage reading module reads the threshold voltage of a certain driving module. The driving current of the light-emitting element is the sum of the currents in the branches where each driving module is located.

2. The multi-drive pixel circuit according to claim 1, characterized in that, The driving module includes a transmission unit and a driving unit, wherein the transmission unit is connected to the driving unit, and the driving unit is connected to the light emission control module; The transmission unit is used to receive the display data signal and transmit the display data signal to the driving unit. The driving unit is used to receive the voltage input signal, generate a driving signal according to the display data signal and the voltage input signal, and transmit the driving signal to the light emission control module.

3. The multi-drive pixel circuit according to claim 2, characterized in that, The driving unit includes a driving switch and a storage capacitor. The control terminal of the driving switch is connected to the transmission unit. The two ends of the storage capacitor are respectively connected to the control terminal and the first terminal of the driving switch. The second terminal of the driving switch is used to receive a voltage input signal.

4. The multi-drive pixel circuit according to claim 2, characterized in that, The transmission unit includes a transmission switch transistor. The control terminal of the transmission switch transistor is used to receive external signals. The first terminal of the transmission switch transistor is connected to the driving unit, and the second terminal of the transmission switch transistor is used to receive the display data signal.

5. The multi-drive pixel circuit according to claim 1, characterized in that, The voltage reading module is also used to send a trigger signal to the drive module, and the trigger signal is used to control the drive module to turn on.

6. The multi-drive pixel circuit according to claim 1, characterized in that, The number of light-emitting control modules matches the number of isolation modules, and each light-emitting control module is connected to a different isolation module.

7. A display device, characterized in that, It includes a light-emitting element and a multi-drive pixel circuit according to any one of claims 1-6.

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