Display device and driving circuit thereof

Abstract

The utility model provides a display device and a driving circuit thereof, and the driving circuit comprises a voltage detection circuit which is used for detecting an initialization signal of the display device in a current image display period, and the initialization signal is used for initializing a light-emitting device of a pixel circuit; the judgment circuit is connected with the voltage detection circuit and is used for responding to the initialization signal which drops from a first voltage to a second voltage and judging whether the first duration of the drop reaches a first preset duration or not; wherein the difference value between the second voltage and the first voltage exceeds a voltage threshold value; and the voltage control circuit is connected with the judgment circuit and the pixel circuit, and is used for adjusting the initialization signal in the next picture display period in response to the first duration reaching the first preset duration, so that the anode voltage of the light-emitting device is consistent. The poor phenomenon of low-gray-scale screen splitting of the display device can be improved, and the yield is increased.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a display device and its driving circuit. Background Technology

[0002] In display devices, OLEDs typically require multiple resets to meet seamless refresh rate requirements and optimize display effects. However, during these resets, the display process involves active and blanking phases. When the load of a reset signal during the blanking phase differs from that during the non-blank phase, fluctuations in the initialization voltage during reset occur. This affects the voltage difference between the initial voltage and the negative power supply voltage. This variation interferes with the OLED device's anode reset process, particularly during low grayscale activation, leading to screen splitting. Utility Model Content

[0003] This disclosure proposes a display device and its driving circuit to solve or partially solve the above-mentioned technical problems.

[0004] A first aspect of this disclosure provides a driving circuit for a display device, used to provide initialization signals for pixel circuits of the display device, the driving circuit comprising:

[0005] A voltage detection circuit is used to provide an initialization signal to the light-emitting device of the display device, and the driving circuit includes:

[0006] A voltage detection circuit is used to detect the initialization signal of the display device within the current display cycle, and the initialization signal is used to initialize the light-emitting device;

[0007] A judgment circuit, connected to the voltage detection circuit, is used to determine whether the first duration of the voltage drop reaches a first preset duration in response to the initialization signal dropping from a first voltage to a second voltage; wherein the difference between the second voltage and the first voltage exceeds a voltage threshold.

[0008] A voltage control circuit, connected to the judgment circuit and the display device, is used to adjust the initialization signal in the next screen display cycle in response to the first duration reaching the first preset duration, so as to make the anode voltage of the light-emitting device consistent during initialization.

[0009] A second aspect of this disclosure provides a display device, comprising:

[0010] Multiple sub-pixels arranged in an array and multiple pixel circuits for driving the multiple sub-pixels;

[0011] The driving circuit as described in the first aspect is used to provide initialization signals for the plurality of pixel circuits.

[0012] As can be seen from the above, the display device and its driving circuit provided in this disclosure, by detecting the initialization signal, adjusts the initialization signal for the next display cycle when the duration of the initialization signal voltage drop meets a preset duration, ensuring the consistency of the anode voltage during the initialization of the light-emitting device. This precise control of the initialization signal adjustment effectively improves the screen splitting problem that occurs when the display device displays at low grayscale levels, thereby enhancing the overall display quality of the display device. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in this disclosure or related technologies, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a pixel circuit in a related technology.

[0015] Figure 2 This is a schematic diagram of the reset of a light-emitting device in a related technology.

[0016] Figure 3 This is a schematic diagram of the waveform of the initialization signal in related technologies.

[0017] Figure 4 This is a schematic diagram of the split-screen phenomenon in related technologies.

[0018] Figure 5 This is a schematic diagram of the driving circuit of the display device according to an embodiment of the present disclosure.

[0019] Figure 6 This is a schematic diagram of the driving circuit according to an embodiment of the present disclosure.

[0020] Figure 7 This is a schematic diagram of a driving method for a display device according to an embodiment of the present disclosure.

[0021] Figure 8 This is a schematic diagram of a driving method for a display device according to an embodiment of the present disclosure. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] In large-size display technologies, the voltage difference between the initialization signal Vint2 and the negative power supply voltage ELVSS determines the performance of low grayscale images. To meet the refresh rate requirements for smoother visuals and to achieve better display effects, the initialization signal Vint2 is often used to reset the light-emitting devices multiple times. In pixel circuits, the anode of the light-emitting device is typically connected to the initialization signal Vint2 via a reset circuit, such as... Figure 1 As shown, Figure 1 A schematic diagram of a pixel circuit in the related technology is shown. Figure 1 In the process, the first electrode (e.g., anode) of the light-emitting device L receives the initialization signal Vint2 via a reset circuit T7 (e.g., transistor T7). The first terminal (e.g., drain) of the reset circuit T7 is connected to the first electrode of the light-emitting device L, the second terminal (e.g., source) of the reset circuit T7 is connected to the initialization signal Vint2, and the control terminal (e.g., gate) of the reset circuit T7 is connected to the reset signal Reset2. When the reset signal Reset2 is at a valid reset level, the reset circuit T7 is turned on, and the initialization signal Vint2 is provided to the first electrode of the light-emitting device L, initializing (or resetting) the first electrode of the light-emitting device L to clear the existing charge in the first electrode of the light-emitting device L. Multiple resets may occur within a single display cycle, such as... Figure 2 As shown, Figure 2 A schematic diagram of the reset of a light-emitting device in the related technology is shown. Figure 2 In the diagram, the horizontal axis represents the scan time t, where ti (i is a positive integer) can be the moment when the reset signal is at an active level; the vertical axis represents the sub-pixels of rows 1-12 corresponding to the reset signal lines G1 to G12, respectively. Figure 2In the diagram, "1" represents the first pulse signal, "2" represents the second pulse signal, and "3" represents the third pulse signal. These represent the signal pulses when the second reset signal line Reset2 is active in the first, second, and third frequency conversion units within a display frame, respectively. The effective display phase of the nth frame (i.e., the nth screen display cycle) is t1-t12, the blanking phase (which can be a virtual time period used to adapt to display drive timing and signal transmission) is t13-t14, and the effective display phase of the (n+1)th frame (i.e., the (n+1)th screen display cycle) is t15-t26. Horizontally, the signals of the first reset signal line G1 at t1 and t15 are the first pulse signals, and the signals at t6 and t20 are the second pulse signals, and so on for other reset signal lines.

[0025] From a vertical perspective, taking t11 as an example, at t11, the signal of the first reset signal line is the third pulse signal, the signal of the sixth reset signal line is the second pulse signal, and the signal of the eleventh reset signal line is the first pulse signal. That is, at t11, the first, sixth, and eleventh reset signal lines are simultaneously turned on. When the reset signal lines are turned on, the second initial signal line provides an initial signal to the first electrode of the light-emitting device. In other words, at t11, the initial signal lines in the sub-pixels connected to the first, sixth, and eleventh reset signal lines provide an initial signal to the first electrode of the light-emitting device to effectively reset the first electrode of the light-emitting device. The same principle applies to other times.

[0026] After the first scan of the first pulse signal is completed, the display device enters the blanking phase (t13 and t14). At t13, the third reset signal line G3 and the eighth reset signal line G8 are simultaneously turned on; at t14, the fourth reset signal line G4 and the ninth reset signal line G9 are simultaneously turned on. After the first scan of the second pulse signal is completed, at t18, the fourth reset signal line G4 and the eighth reset signal line G8 are simultaneously turned on; at t19, the fifth reset signal line G5 and the eighth reset signal line G8 are simultaneously turned on. After the first scan of the third pulse signal is completed, at t23, the fourth reset signal line G4 and the ninth reset signal line G9 are simultaneously turned on; at t24, the fifth reset signal line G5 and the tenth reset signal line G10 are simultaneously turned on.

[0027] As can be seen, during all display frames except the first display frame and the aforementioned time periods, three second reset signal lines are simultaneously active on the display device. Therefore, the timing of the reset signals causes a difference in the number of rows of reset signal lines simultaneously active during the blanking phase and the partial effective display phase. Specifically, three rows of reset signal lines are simultaneously active during the partial effective display phase, and two rows are simultaneously active during both the partial effective display phase and the blanking phase. In this scenario, the fact that three rows of reset signal lines are simultaneously active during a portion of the display frame indicates that the load of the initialization signal is the sum of the anode capacitances of the three rows of light-emitting devices. The fact that two rows of reset signal lines are simultaneously active during the blanking phase indicates that the load of the initialization signal is the sum of the anode capacitances of the two rows of light-emitting devices. This difference in the load of the initialization signal between the effective display frame and the blanking phase causes the potential of the first electrode of the light-emitting device in some sub-pixels of the displayed frame to be higher than the potential of the first electrode of the light-emitting device in the blanking phase. Figure 3 As shown, Figure 3 A schematic diagram of the waveform of the initialization signal in the related art is shown. Figure 3 During the initialization phase, the Vinit2 signal experiences multiple voltage drops within a single display cycle. This causes the light-emitting devices of the sub-pixels displayed during the blanking phase to light up more slowly, resulting in a darker display and brighter surrounding areas. This creates a split-screen effect, leading to poor display quality.

[0028] Different reset counts may result in different screen splitting phenomena. For example, if a display frame includes two frequency conversion units, half of the display device will be darker, and the display effect will appear as a two-screen split. If a display frame includes three frequency conversion units, one-third and two-thirds of the display device will be darker, and the display effect will appear as a three-screen split. Figure 4 As shown, Figure 4 A schematic diagram of the split-screen phenomenon in related technologies is shown. When a display frame includes four frequency conversion units, the quarter, two-quarters, and three-quarters of the display device are darker, and the display screen effect is a four-screen split.

[0029] Therefore, how to improve the low grayscale splitting defect phenomenon in display devices and increase the yield rate has become an urgent technical problem to be solved.

[0030] Therefore, this disclosure provides a display device and its driving circuit, which, by detecting an initialization signal, adjusts the initialization signal for the next display cycle when the duration of the initialization signal voltage drop meets a preset duration, ensuring the consistency of the anode voltage during the initialization of the light-emitting device. This precise control of the initialization signal adjustment effectively improves the screen splitting problem that occurs when the display device displays at low grayscale levels, thereby enhancing the overall display quality of the display device.

[0031] See Figure 5 , Figure 5 A schematic diagram of a driving circuit for a display device according to an embodiment of the present disclosure is shown. Exemplarily, this driving circuit is used to drive the display device and provide initialization signals to the pixel circuits of the display device. Figure 5 In the middle, the driving circuit includes:

[0032] A voltage detection circuit is used to detect the initialization signal of the display device within the current display cycle, and the initialization signal is used to initialize the light-emitting device;

[0033] A judgment circuit, connected to the voltage detection circuit, is used to determine whether the first duration of the voltage drop reaches a first preset duration in response to the initialization signal dropping from a first voltage to a second voltage; wherein the difference between the second voltage and the first voltage exceeds a voltage threshold.

[0034] A voltage control circuit, connected to the judgment circuit and the display device, is used to adjust the initialization signal in the next screen display cycle in response to the first duration reaching the first preset duration, so as to make the anode voltage of the light-emitting device consistent during initialization.

[0035] The initialization signal can be used to initialize light-emitting devices (such as OLED pixels). At the beginning of each display cycle, the voltage detection circuit can detect the voltage change of the initialization signal. When the initialization signal drops from a first voltage (e.g., a higher voltage to ensure the light-emitting device is fully discharged or initialized) to a second voltage (e.g., a lower voltage indicating that part or all of the initialization process has been completed), if the voltage difference during this drop (i.e., the difference between the first and second voltages) exceeds a preset voltage threshold (the voltage threshold can range from 10mV to 100mV, e.g., 30mV), the judgment circuit will further determine whether the first duration of this drop process has reached a preset first duration (the first preset duration can range from 1 to 30ms, e.g., 8ms). If the judgment circuit determines that the first duration has reached the first preset duration, the voltage control circuit will adjust the initialization signal in the next display cycle, for example, by changing the voltage level of the initialization signal, to ensure that the anode voltage of all light-emitting devices remains consistent during initialization. This ensures that the brightness of each light-emitting device is consistent, thereby producing a uniform and high-quality display effect and improving the low grayscale splitting problem of the display device.

[0036] It should be understood that the implementation methods of voltage detection circuits, judgment circuits, and voltage control circuits can be selected according to specific application scenarios and requirements. In hardware implementation, these functions can be implemented using analog circuit components; while in scenarios where they are used in conjunction with microcontrollers, more flexible control can be achieved through software programming.

[0037] Specifically, a voltage detection circuit may include components such as voltage divider resistors, operational amplifiers, or comparators. The initialization signal is attenuated to a suitable detection range by the voltage divider resistors, and then the operational amplifier or comparator is used to detect the voltage level of the initialization signal. The voltage detection circuit can also read the voltage value of the initialization signal via an analog-to-digital converter (ADC) and analyze it in software.

[0038] The judgment circuit is connected to the voltage detection circuit and is used to determine whether the first duration of the voltage drop process, when the initialization signal drops from a first voltage to a second voltage, reaches a first preset duration, where the difference between the second voltage and the first voltage exceeds a preset voltage threshold. Specifically, the judgment circuit may include components such as a timer, counter, or microcontroller. When the voltage detection circuit detects that the voltage drop exceeds the voltage threshold, it can start the timer to obtain the first duration. When the voltage rises or recovers to a certain level (e.g., recovers to the first voltage, or another voltage value), the timing stops, and the timing result, i.e., the first duration, is obtained. This first duration is compared with the first preset duration. When the first duration is greater than or equal to the first preset duration, the judgment module can generate a first control signal. When the first duration is less than the first preset duration, the judgment module can generate a second control signal or not output a signal. The judgment circuit can also be used in conjunction with a microcontroller, which can be implemented through a software timer. When a voltage drop is detected, the software timer is started to obtain the first duration. After the voltage rises or recovers, it is compared with the first preset duration, and different control signals are generated based on different comparison results.

[0039] The voltage control circuit is connected to the judgment circuit and the display device. For example, the display device includes multiple sub-pixels arranged in an array and multiple pixel circuits for driving the sub-pixels. The voltage control circuit can provide an initialization signal to the sub-pixels (e.g., light-emitting devices) via a reset circuit of the pixel circuit. If the judgment circuit detects that the first duration has reached a preset duration, the voltage control circuit, in response to a first adjustment signal generated by the judgment circuit, adjusts the initialization signal Vinit2 in the next display cycle to ensure that the anode voltage of the light-emitting device is consistent during initialization. If the judgment circuit detects that the first duration has not reached the preset duration, the voltage control circuit, in response to a second adjustment signal generated by the judgment circuit (or if the judgment circuit has no output signal), does not adjust the initialization signal Vinit2 in the next display cycle. Specifically, the voltage control circuit may include a digital-to-analog converter (DAC), a voltage regulator, or a switching element. Based on the first or second adjustment signal output by the judgment circuit, the voltage control circuit can adjust the voltage level of the initialization signal provided to the pixel circuit. The voltage control circuit can also control the output of the DAC or voltage regulator via software to adjust the voltage of the initialization signal according to the judgment result.

[0040] In some embodiments, the pixel circuit driving the light-emitting device includes a reset circuit, a first terminal of the reset circuit being connected to the anode of the corresponding light-emitting device, and the output terminal of the voltage control circuit being connected to the second terminal of the reset circuit to provide the initialization signal; the control terminal of the reset circuit receives the reset signal of the light-emitting device.

[0041] In the next display cycle, when the reset signal is at an active level (e.g., high or low), the reset circuit is turned on. At this time, the voltage control circuit adjusts the initialization signal to keep the output of the initialization signal stable. The output initialization signal is then transmitted to the anode of the light-emitting device through the reset circuit to maintain the anode voltage at the first voltage (i.e., the voltage value of the initialization signal) for initialization, ensuring that the light-emitting device has consistent starting conditions during display.

[0042] Specifically, the reset circuit can be a transistor, such as... Figure 1 As shown, the anode of the light-emitting device L is connected to the reset circuit (transistor T7), and the cathode is connected to the common voltage ELVSS. The reset circuit can also be connected to the voltage control circuit ( Figure 1 (Not shown in the diagram) A connection is used to receive the initialization signal Vinit2. The control terminal of the reset circuit can receive a reset signal; for example, the control terminal of the reset circuit can be connected to the source drive circuit to receive the reset signal sent by the source drive circuit.

[0043] In some embodiments, the voltage control circuit is connected to a first power supply line extending along a first direction to provide the initialization signal;

[0044] The reset circuit of each row of pixel circuits is connected to the corresponding initialization signal line, which extends along the second direction and is connected to the first power supply line.

[0045] The first power supply line can be a common line providing initialization signals to all pixel circuits (or a portion thereof). The voltage control circuit provides the initialization signal by connecting to the first power supply line extending along a first direction (e.g., the column direction). The pixel circuits are arranged in a matrix, with each pixel circuit containing a reset circuit. The reset circuit of each row of pixel circuits is connected to a corresponding initialization signal line, and the initialization signal line of each row can be connected to the first power supply line. When the voltage control circuit outputs an initialization signal, this signal is first transmitted through the first power supply line. Then, the initialization signal is distributed to the reset circuit of each row of pixel circuits through the initialization signal lines of each row. The reset circuit conducts upon receiving a valid reset signal, transmitting the initialization signal to the anode of the light-emitting device, thereby completing the initialization process. When the voltage control circuit adjusts the initialization signal to maintain a stable voltage, the voltages of the first power supply line and the initialization signal line are also adjusted accordingly, thereby ensuring that the anode voltage of the light-emitting device remains consistent throughout the display cycle.

[0046] In some embodiments, the driving circuit further includes:

[0047] The source drive circuit is connected to a reset signal line extending along the second direction to provide the reset signal; the control terminal of the reset circuit of each row of pixel circuits is connected to the corresponding reset signal line.

[0048] The source drive circuit can provide a reset signal via a reset signal line extending along a second direction (e.g., the row direction). The control terminal of the reset circuit for each row of pixels is connected to the corresponding reset signal line, ensuring that each row of pixels can receive a reset signal when needed.

[0049] Specifically, see Figure 6 , Figure 6 A schematic diagram of a drive circuit according to an embodiment of the present disclosure is shown. Figure 6 In the display device, multiple pixel units PX are arranged in an array, and each pixel unit PX includes sub-pixels (e.g., Figure 1 The light-emitting device in the image) and the pixel circuitry for driving the sub-pixel (such as...) Figure 1(As shown). The first output of the source driver circuit in the driving circuit can be connected to the reset signal line Line_Reset to transmit the reset signal Reset via this reset signal line. The control terminal of the reset circuit is connected to the reset signal line. The second output of the source driver circuit can be connected to the first power supply line L1. Each row initialization signal line Line_Vinit2 is connected to the first power supply line L1. Each reset circuit in each row of pixel circuits is connected to the initialization signal line Line_Vinit2 to obtain the initialization signal Vinit2.

[0050] In some embodiments, the driving circuit is disposed in the power management circuit, the input terminal of the voltage detection circuit is the voltage detection pin of the power management circuit, the output terminal of the voltage control circuit is the initialization signal pin of the power management circuit, and the initialization signal pin is connected to the voltage detection pin.

[0051] The power management circuit can be a power management chip, the input of the voltage detection circuit can be the voltage detection pin of the power management chip, and the output of the voltage control circuit can be the initialization signal pin of the power management chip. The initialization signal pin can be connected to the voltage detection pin to realize the voltage detection of the initialization signal by the voltage detection pin.

[0052] In some embodiments, the driving circuit is disposed in the source driving circuit, the input terminal of the voltage detection circuit is a pin of the source driving circuit; the output terminal of the voltage control circuit is the initialization signal pin of the source driving circuit, and the initialization signal pin is connected to the voltage detection pin.

[0053] The voltage control circuit is connected to the power management circuit and is used to provide the initialization signal to the pixel circuit based on the operating voltage signal provided by the power management circuit.

[0054] The source driver circuit can have multiple output pins, including a reset signal pin for providing a reset signal, a data signal pin for providing a data signal, and an initialization signal pin for providing an initialization signal. The source driver circuit can convert the operating voltage signal provided by the power management circuit into various different signal outputs. Specifically, the reset signal pin of the source driver circuit can be a reset signal converted from the operating voltage signal provided by the power management circuit, and the initialization signal pin can be an initialization signal converted from the operating voltage signal provided by the power management circuit by the voltage control circuit. This initialization signal pin can be connected to a voltage detection pin to enable voltage detection of the initialization signal by the voltage detection pin.

[0055] Specifically, such as Figure 6As shown, the driving circuit may also include a timing controller, which provides corresponding timing signals to the source driver circuit, the electroluminescent circuit, and the power management circuit. The power management circuit provides operating voltage to the source driver circuit, the electroluminescent circuit, and the timing controller. The source driver circuit can be a source driver chip (SDIC), which can receive image data signals (isp) and GOA timing signals from the timing controller (e.g., a timing control chip). If the SDIC chip has voltage conversion capabilities, it can also generate various GOA signals, such as GateGOA, EMGOA, and ResetGOA. The timing controller also communicates with the power management circuit and the electroluminescent circuit via serial communication (I2C1 and I2C3).

[0056] The driving circuit may also include a power management circuit, which may be a power management chip (PMIC). The PMIC chip can convert the input voltage VCC from the master device (e.g., the host) into the required digital voltage signal, analog voltage signal AVDD, high-voltage reference signal VGH / low-voltage reference signal VGL, gamma reference signal VGSP / VGMP, and initialization signals VINT1 and VINT2, to be provided to the gate driving circuit. The PMIC chip can also provide input / output voltages VIO to the timing controller and source driving circuit.

[0057] The driving circuit may also include an electroluminescent circuit, which may be an electroluminescent chip (ELIC). The ELIC can provide ELVDD and ELVSS leads to the pixel circuit via a gate driving circuit. The ELVDD and ELVSS leads can provide high-level voltage and low-level voltage, respectively. The ELVSS lead can be connected to the cathode of the light-emitting device.

[0058] The driver circuit may also include a connector that provides the input voltage VCC of the autonomous device (e.g., the host) to the power management circuitry, and provides the core voltage VCORE of the timing controller via a converter (e.g., a buck converter). The connector may also provide the voltage VBAT of the autonomous device to the electroluminescent circuitry. The connector may also transmit commands from the autonomous device to the timing controller via MIPI. Furthermore, the connector may facilitate communication between the external system and the timing controller via serial communication methods I2C1, I2C3, and SPIM.

[0059] In some embodiments, during a first time period of the next screen display cycle, the voltage detection circuit detects that the initialization signal is a first voltage;

[0060] When the reset signal is at an active level, the reset circuit is turned on to provide the initialization signal to the anode of the light-emitting device, and the anode voltage of the light-emitting device is the first voltage.

[0061] The first time period can refer to the period in the next display cycle during which the initialization signal has not yet experienced a voltage drop. At this time, the voltage of the initialization signal is the first voltage. When the reset signal line is at an active level, the reset circuit in the corresponding row of pixel circuits is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized.

[0062] In some embodiments, during a second time period of the next screen display cycle, the voltage detection circuit detects that the initialization signal drops from a first voltage to a second voltage.

[0063] The judgment circuit sends a first control signal to the voltage control circuit in response to the second duration of the initialization signal dropping from the first voltage to the second voltage reaching a second preset duration; wherein the second preset duration is greater than or equal to 0ms;

[0064] The voltage control circuit increases the initialization signal by the difference between the first voltage and the second voltage based on the first control signal, so that the initialization signal is increased to the first voltage;

[0065] When the reset signal is at an active level, the reset circuit is turned on to provide the initialization signal to the anode of the light-emitting device, and the anode voltage of the light-emitting device is the first voltage.

[0066] The second time period can refer to the time period during which the voltage of the initialization signal drops in the next display cycle. During this time, the voltage of the initialization signal drops from a first voltage to a second voltage. The system can detect whether the second duration of the initialization signal drop reaches a second preset duration. In some embodiments, the second preset duration can be greater than 0 ms. This second preset duration can be the same as or different from the first preset duration. The range of the second preset duration can be 1-30 ms, for example, 8 ms. When the second duration is greater than the second preset duration, the determination circuit sends a first control signal to the voltage control circuit. When the voltage control circuit receives the first control signal, it raises the voltage of the initial signal to the first voltage, that is, increases the difference between the first voltage and the second voltage. At this time, when the reset signal line is at an active level, the reset circuit in the corresponding row of pixel circuits is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized. In some embodiments, the second preset duration can be equal to 0 ms, that is, once the initial signal drop to the second voltage is detected, the determination circuit sends the first control signal to the voltage control circuit. When the voltage control circuit receives the first control signal, it increases the voltage of the initial signal by the difference between the first and second voltages. In this way, the initialization signal is always maintained at the first voltage. When the reset signal line is active, the reset circuit in the corresponding row of pixel circuits is activated, and the initialization signal is input to the anode of the light-emitting device. This ensures that the anode voltage of the light-emitting device is the first voltage during initialization, guaranteeing consistent anode voltages during initialization, preventing screen splitting, and improving the display effect.

[0067] In some embodiments, the number of light-emitting devices initialized in the second time period is less than the number of light-emitting devices initialized in the first time period.

[0068] Specifically, the number of rows of reset signal lines simultaneously turned on during the voltage drop phase is less than the number of rows of reset signal lines simultaneously turned on during the voltage non-drop phase. Correspondingly, the number of light-emitting devices initialized in the second time period is less than the number of light-emitting devices initialized in the first time period.

[0069] In some embodiments, during the third time period of the next screen display cycle, the voltage detection circuit detects that the initialization signal is a first voltage or exceeds the first voltage;

[0070] The judgment circuit sends a second control signal to the voltage control circuit in response to the initialization signal exceeding the first voltage, or the initialization signal being adjusted to a third duration of the first voltage reaching the first duration or the first preset duration.

[0071] The voltage control circuit reduces the initialization signal by the difference between the first voltage and the second voltage based on the second control signal, so that the voltage of the initialization signal drops to the first voltage;

[0072] When the reset signal is at an active level, the reset circuit is turned on to provide the initialization signal to the anode of the light-emitting device, and the anode voltage of the light-emitting device is the first voltage.

[0073] The third time period can refer to the period during which the voltage of the initialization signal recovers after a voltage drop in the next display cycle. Similar to the first and second time periods, the number of light-emitting devices initialized in the second time period is less than the number initialized in the third time period. The number of rows of reset signal lines simultaneously activated in the second time period is less than the number of rows of reset signal lines simultaneously activated in the third time period. Due to the change in reset load, the voltage of the initialization signal recovers from its dropping state. In some embodiments, when the voltage of the initialization signal recovers to above the first voltage, the determination circuit sends a second control signal to the voltage control circuit. In other embodiments, since the voltage drop of the initialization signal is also regular, its duration can be a fixed value. When the duration of the voltage drop exceeds this fixed value, the voltage of the initialization signal will recover. Therefore, when the third duration of raising the initialization signal to the first voltage reaches the first preset duration or the first duration of the voltage drop in the previous display cycle, the determination circuit can send a second control signal to the voltage control circuit.

[0074] When the voltage control circuit receives the second control signal, it reduces the voltage of the initialization signal to the first voltage, that is, reduces the difference, so as to keep the initialization signal always at the first voltage. When the reset signal line is at an active level, the reset circuit in the corresponding row of pixel circuit is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized.

[0075] Therefore, it can be seen that during the initialization of the light-emitting device in the next display cycle, the anode voltage is always the first voltage, which ensures that the anode voltage of the light-emitting device is consistent during initialization, avoids the occurrence of screen splitting, and improves the display effect.

[0076] See Figure 7 , Figure 7 A schematic diagram of a driving method for a display device according to an embodiment of the present disclosure is shown. Figure 7 In the above, a driving method for a display device is provided for providing an initialization signal to the light-emitting device of the display device, the driving method 700 comprising:

[0077] In step S710, the initialization signal of the display device during the current display cycle is detected, and the initialization signal is used to initialize the light-emitting device.

[0078] At the start of each display cycle, the voltage change of the initialization signal can be detected, for example, by detecting the voltage waveform of the initialization signal. Specifically, this can be achieved by connecting the voltage detection pin of the source drive circuit or power management circuit of the pixel circuit driving the light-emitting device to the output pin of the initialization signal.

[0079] In step S720, in response to the initialization signal dropping from a first voltage to a second voltage, it is determined whether the first duration of the drop reaches a first preset duration; wherein the difference between the second voltage and the first voltage exceeds a voltage threshold.

[0080] The difference between the second voltage and the first voltage exceeding a voltage threshold is to ensure that the detected voltage change reliably indicates the change in the initialization signal. It can be determined whether the change in the initialization signal conforms to the expected time range. For example, to detect the duration of the initialization signal decreasing from a higher voltage (first voltage) to a lower voltage (second voltage), the duration of this process (first duration) can be calculated from the start and end times of the decrease from the first voltage to the second voltage, and compared with a preset first duration.

[0081] In step S730, in response to the first duration reaching the first preset duration, the initialization signal is adjusted in the next screen display cycle to make the anode voltage of the light-emitting device consistent during initialization.

[0082] Specifically, if the duration of the initialization signal's fall (i.e., the first duration) reaches a first preset duration, the initialization signal needs to be adjusted to ensure that all light-emitting devices have a consistent anode voltage during initialization. This ensures the stability and consistency of the light-emitting devices, thereby improving the overall display quality.

[0083] In some embodiments, adjusting the initialization signal in the next screen display cycle includes:

[0084] During the next display cycle, in response to the second duration of the initialization signal dropping to the second voltage reaching a second preset duration, the voltage of the initialization signal is increased by the difference between the second voltage and the first voltage to adjust the initialization signal to the first voltage; wherein the second preset duration is greater than or equal to 0.

[0085] When the voltage of the initialization signal drops from a first voltage to a second voltage, it can be detected whether the second duration of the initialization signal drop reaches a second preset duration. In some embodiments, the second preset duration can be greater than 0. If the second duration is greater than the second preset duration, the determination circuit sends a first control signal to the voltage control circuit. When the voltage control circuit receives the first control signal, it raises the voltage of the initial signal to the first voltage, that is, increases the difference between the first voltage and the second voltage. At this time, when the reset signal line is at an active level, the reset circuit in the corresponding row of pixel circuits is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized. In some embodiments, the second preset duration can be equal to 0, that is, once the initial signal is detected to drop to the second voltage, the determination circuit sends a first control signal to the voltage control circuit. When the voltage control circuit receives the first control signal, it raises the voltage of the initial signal to the difference between the first voltage and the second voltage. In this way, the initialization signal is always maintained at the first voltage. When the reset signal line is at an effective level, the reset circuit in the corresponding row of pixel circuit is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized. This ensures that the anode voltage of the light-emitting device is consistent during initialization, avoids the occurrence of screen splitting, and improves the display effect.

[0086] In some embodiments, the method further includes:

[0087] When the reset signal received by the reset circuit is at an effective level, the reset circuit is turned on and provides the initialization signal to the anode of the light-emitting device, and the anode voltage of the light-emitting device is the first voltage.

[0088] When the voltage of the initialization signal does not drop, it can be the first voltage. At this time, when the reset signal line is at an effective level, the reset circuit in the corresponding row of pixel circuit is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized.

[0089] In some embodiments, after adjusting the initialization signal to the first voltage, the driving method 700 further includes:

[0090] During the next display cycle, in response to the initialization signal exceeding the first voltage, the initialization signal is reduced by the difference between the first voltage and the second voltage, so that the voltage of the initialization signal drops to the first voltage;

[0091] When the reset signal is at an active level, the reset circuit is turned on to provide the initialization signal to the anode of the light-emitting device, and the anode voltage of the light-emitting device is the first voltage.

[0092] In this process, due to changes in the reset load, the voltage of the initialization signal recovers from a decreasing state. In some embodiments, when the voltage of the initialization signal recovers to a level exceeding the first voltage, the determination circuit sends a second control signal to the voltage control circuit. When the voltage control circuit receives the second control signal, it reduces the voltage of the initialization signal back to the first voltage, i.e., reduces the difference between the first and second voltages, to maintain the initialization signal at the first voltage. When the reset signal line is at an active level, the reset circuit in the corresponding row of pixel circuits is activated, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized.

[0093] In some embodiments, after adjusting the initialization signal to the first voltage, the driving method 700 further includes:

[0094] In response to the third duration of the initialization signal being adjusted to the first voltage reaching the first duration or the first preset duration, the difference between the first voltage and the second voltage of the initialization signal is reduced, so that the voltage of the initialization signal is reduced to the first voltage;

[0095] When the reset signal is at an active level, the reset circuit is turned on to provide the initialization signal to the anode of the light-emitting device, and the anode voltage of the light-emitting device is the first voltage.

[0096] Since the voltage drop of the initialization signal is also regular, its duration can be a fixed value. When the voltage drop duration exceeds this fixed value, the voltage of the initialization signal will recover. Therefore, when the third duration of raising the initialization signal to the first voltage reaches the first preset duration or the first duration of the voltage drop in the previous display cycle, the judgment circuit can send a second control signal to the voltage control circuit. When the voltage control circuit receives the second control signal, it lowers the voltage of the initialization signal to the first voltage, that is, it lowers the difference between the first voltage and the second voltage, so as to continue to maintain the initialization signal at the first voltage. When the reset signal line is at an active level, the reset circuit in the corresponding row pixel circuit is turned on, and the initialization signal is input to the anode of the light-emitting device, so that the anode voltage of the light-emitting device is the first voltage when it is initialized.

[0097] Specifically, see Figure 8 , Figure 8 A schematic diagram of a driving method according to an embodiment of the present disclosure is shown. Figure 8In this process, the drive circuit of the display device can be powered on, and the display panel of the display device can be woken up based on the MIPI (Mobile Industry Processor Interface) 11 instruction (exit sleep instruction) or 29 instruction (turn on display instruction). The voltage of the initialization signal Vinit2 input to the display panel can be detected to determine whether the voltage change of the initialization signal Vinit2 within a preset time period (e.g., the current screen display cycle) meets a preset condition. If the voltage change of the initialization signal Vinit2 meets the preset condition, it is determined that the voltage of the initialization signal Vinit2 needs to be compensated. For example, the preset condition could be that the voltage of the initialization signal Vinit2 drops, drops to a certain value, and remains for X ms (X is a positive number). If this preset condition is met, the voltage of the initialization signal Vinit2 can be adjusted and compensated when a voltage drop is detected in the next screen display cycle or when the voltage drop continues for a preset duration, so that it remains consistent. When the reset signal of the pixel circuit is active, the reset circuit is turned on to provide an initialization signal to the anode of the light-emitting device. This ensures that the anode voltage of the light-emitting device remains consistent during initialization, i.e., it is the first voltage. This guarantees the consistency of the output image quality of the display device, improves the low grayscale splitting defect phenomenon, and increases the yield rate.

[0098] This disclosure also proposes a display device, comprising:

[0099] Multiple sub-pixels arranged in an array and multiple pixel circuits for driving the multiple sub-pixels;

[0100] The driving circuit described in the embodiments of this disclosure is used to provide initialization signals for the plurality of pixel circuits;

[0101] Alternatively, the pixel circuit can be driven using the driving method described in the embodiments of this disclosure.

[0102] Based on the same technical concept, corresponding to the methods of any of the above embodiments, this disclosure also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the driving method of the display device as described in any of the above embodiments.

[0103] Based on the same technical concept, corresponding to the methods of any of the above embodiments, this disclosure also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the driving method of the display device as described in any of the above embodiments.

[0104] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0105] The computer instructions stored in the storage medium of the above embodiments are used to cause the computer to execute the driving method of the display device as described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0106] It should be noted that the above description describes some embodiments of this disclosure. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0107] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this disclosure as described above, which are not provided in detail for the sake of brevity.

[0108] Additionally, to simplify the description and discussion, and to avoid obscuring the embodiments of this disclosure, the provided drawings may or may not show well-known power / ground connections to integrated circuit (IC) chips and other components. Furthermore, the apparatus may be shown in block diagram form to avoid obscuring the embodiments of this disclosure, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which the embodiments of this disclosure will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that the embodiments of this disclosure can be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0109] Although this disclosure has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0110] This disclosure is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A driving circuit of a display device for providing an initializing signal to a light emitting device of the display device, characterized in that, The driving circuit comprises: a voltage detection circuit configured to detect an initialization signal of the display device in a current frame period, the initialization signal being configured to initialize the light emitting device; a judgment circuit connected to the voltage detection circuit and configured to determine whether a first duration of the drop of the initialization signal from the first voltage to the second voltage reaches a first preset duration; a voltage control circuit connected to the judgment circuit and the display device and configured to adjust the initialization signal in a next frame period to make the anode voltage of the light emitting device consistent when the light emitting device is initialized in response to the first duration reaching the first preset duration.

2. The drive circuit according to claim 1, characterized by The pixel circuit driving the light emitting device comprises a reset circuit, a first end of the reset circuit being connected to an anode of the corresponding light emitting device, and an output end of the voltage control circuit being connected to a second end of the reset circuit to provide the initialization signal; and a control end of the reset circuit receiving a reset signal of the light emitting device.

3. The drive circuit according to claim 2, characterized in that, The voltage control circuit is connected to a first power supply line extending in a first direction to provide the initialization signal. The reset circuit of each row of the pixel circuit is connected to a corresponding initialization signal line extending in a second direction and connected to the first power supply line.

4. The drive circuit according to claim 2, characterized by Further comprising: a source driving circuit connected to a reset signal line extending in the second direction to provide the reset signal; the control end of the reset circuit of each row of the pixel circuit is connected to the corresponding reset signal line.

5. The drive circuit according to claim 2, characterized by The driving circuit is arranged in a power management circuit, an input end of the voltage detection circuit is a voltage detection pin of the power management circuit, and an output end of the voltage control circuit is an initialization signal pin of the power management circuit, the initialization signal pin being connected to the voltage detection pin; Alternatively, the driving circuit is arranged in a source driving circuit, an input end of the voltage detection circuit is a pin of the source driving circuit; an output end of the voltage control circuit is an initialization signal pin of the source driving circuit, the initialization signal pin being connected to the voltage detection pin; The voltage control circuit is connected to the power management circuit and configured to provide the initialization signal to the pixel circuit based on a working voltage signal provided by the power management circuit.

6. The drive circuit according to claim 2, characterized by In a first time period of the next frame period, the voltage detection circuit detects that the initialization signal is the first voltage; When the reset signal is a valid level, the reset circuit is turned on to provide the initialization signal to the anode of the light emitting device, and the anode voltage of the light emitting device is the first voltage.

7. The drive circuit according to claim 6, characterized in that, In a second time period of the next frame period, the voltage detection circuit detects that the initialization signal drops from the first voltage to the second voltage; The judgment circuit sends a first control signal to the voltage control circuit in response to a second duration of the drop of the initialization signal from the first voltage to the second voltage reaching a second preset duration, and the second preset duration is greater than or equal to 0; The voltage control circuit increases the initialization signal by a difference between the first voltage and the second voltage based on the first control signal, so as to increase the initialization signal to the first voltage. When the reset signal is the active level, the reset circuit is turned on to provide the initialization signal to the anode of the light emitting device, and the anode voltage of the light emitting device is the first voltage.

8. The drive circuit according to claim 7, characterized in that, The number of the light emitting devices initialized in the second time period is less than the number of the light emitting devices initialized in the first time period.

9. The drive circuit according to claim 7, characterized by In a third time period of a next frame display period, the voltage detection circuit detects that the initialization signal is the first voltage or exceeds the first voltage; The judgment circuit sends a second control signal to the voltage control circuit in response to the initialization signal exceeding the first voltage, or the third duration that the initialization signal is adjusted to the first voltage reaching the first duration or a first preset duration; The voltage control circuit decreases the initialization signal by a difference between the first voltage and the second voltage based on the second control signal, so as to decrease the voltage of the initialization signal to the first voltage; When the reset signal is the active level, the reset circuit is turned on to provide the initialization signal to the anode of the light emitting device, and the anode voltage of the light emitting device is the first voltage.

10. A display device, characterized by comprising: Comprise: An array of a plurality of sub-pixels and a plurality of pixel circuits for driving the plurality of sub-pixels; The driving circuit according to any one of claims 1-9, configured to provide an initialization signal to the plurality of sub-pixels.

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