Display panel, display device and voltage control method
By integrating multiple voltage branches into the OLED display panel and switching them using control signals, the problems of high VGH adjustment complexity and power consumption waste are solved, achieving efficient, flexible voltage control and precise voltage adjustment.
Patent Information
- Application Number
- CN202511359200.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-22
- Publication Date
- 2025-11-18
AI Technical Summary
In existing technologies, adjusting the high-potential gate voltage (VGH) of an OLED display panel is complex, inefficient, and wasteful of power.
Multiple voltage branches with different voltages are integrated into the display panel. Through the cooperation of the control unit and the selection module, the control signal is used to switch to the target voltage branch to output the required voltage without changing the circuit structure.
This achieves efficient adjustment of VGH, improves the flexibility and accuracy of voltage control, and reduces power consumption.
Smart Images
Figure CN120977252A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of display technology, and in particular to a display panel, display device, and voltage control method. Background Technology
[0002] Organic light-emitting diodes (OLEDs) are widely used in various display devices due to their advantages such as high contrast, fast response, lightweight, and flexibility. The high-potential gate voltage (VgateHigh, VGH) is the high-voltage level value of the gate of the transistors in the gate driver on array (GOA) and pixel circuit of the OLED display panel, playing a crucial role in pixel driving.
[0003] As the requirements for pixel control precision in display panels become increasingly stringent, VGH often needs to be adjusted to accommodate temperature variations that cause transistor threshold voltage shifts in the GOA or pixel circuits, as well as different VGH requirements.
[0004] Currently, VGH is often adjusted by changing the circuit structure of the control circuit, which has the problems of high adjustment complexity and low adjustment efficiency. Summary of the Invention
[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a display panel, display device and voltage control method that can adjust VGH through control commands without changing the circuit structure, thereby improving the adjustment efficiency of VGH.
[0006] In a first aspect, this application provides a display panel including a control unit and a voltage adjustment circuit. The voltage adjustment circuit includes a selection module and multiple voltage branches. The control unit is electrically connected to the selection module, and the selection module is connected to the output terminals of each voltage branch and the voltage adjustment circuit, respectively. The control unit is used to determine the target voltage required in the display panel; and to generate a control signal based on the target voltage, and send the control signal to the selection module; The selection module is used to receive control signals output by the control unit and control the on / off connection between the target voltage branch corresponding to the target voltage and the output terminal of the voltage adjustment circuit based on the control signals.
[0007] In conjunction with the first aspect, in one possible implementation, the control unit is connected to the first input terminal of the selection module via the serial data line of the integrated circuit bus, and to the second input terminal of the selection module via the serial clock line of the integrated circuit bus. The control unit is used to send control signals to the selection module via the serial data line and the serial clock line of the integrated circuit bus to instruct the selection module to open the path between the target voltage branch corresponding to the target voltage and the output terminal of the voltage adjustment circuit.
[0008] In conjunction with the first aspect, in one possible implementation, the selection module includes a first switching element, a second switching element, and a third switching element. The first end of each switching element is connected to the output end of each voltage branch in a one-to-one correspondence, and the second end of each switching element is connected to the output end of the voltage adjustment circuit. The switching element is used to conduct the path between the voltage branch and the output end of the voltage adjustment circuit when the corresponding voltage branch is the target voltage branch indicated by the control signal.
[0009] In conjunction with the first aspect, in one possible implementation, multiple voltage branches include a first branch, a second branch, and a third branch. The voltage output by the first branch is a multiple of the first power supply voltage, the voltage output by the second branch is the sum of the first power supply voltage and the second power supply voltage, and the voltage output by the third branch is the first power supply voltage. The first power supply voltage and the second power supply voltage are different.
[0010] In conjunction with the first aspect, in one possible implementation, the first power supply voltage is a power supply voltage used to power the analog circuit module of the control unit, and the second power supply voltage is a power supply voltage used to power the digital circuit module of the control unit.
[0011] In conjunction with the first aspect, in one possible implementation, the first branch includes a first power supply, a second power supply, a first capacitor, a second capacitor, a first diode, and a second diode. The anode of the first power supply is connected to the first terminal of the first diode, the anode of the second power supply is connected to the first terminal of the first capacitor, the second terminal of the first diode and the second terminal of the first capacitor are connected to the first terminal of the second diode, the first terminal of the second capacitor is grounded, and the second terminal of the second capacitor and the second terminal of the second diode are connected to the first terminal of the first switching element.
[0012] In conjunction with the first aspect, in one possible implementation, the second branch includes a third power supply, a fourth power supply, a third capacitor, a fourth capacitor, a third diode, and a fourth diode. The anode of the third power supply is connected to the first terminal of the third diode, the anode of the fourth power supply is connected to the first terminal of the third capacitor, the second terminal of the third diode and the second terminal of the third capacitor are connected to the first terminal of the fourth diode, the first terminal of the fourth capacitor is grounded, and the second terminal of the fourth capacitor and the second terminal of the fourth diode are connected to the first terminal of the second switching element.
[0013] In conjunction with the first aspect, in one possible implementation, the third branch includes a fifth power supply and a resistor, with the anode of the fifth power supply connected to the first end of the resistor and the second end of the resistor connected to the first end of the third switching element.
[0014] In conjunction with the first aspect, in one possible implementation, the voltage regulation circuit is integrated inside the power management chip of the display panel.
[0015] Secondly, this application also provides a display device, which includes the display panel described in the first aspect or any one of the first aspects.
[0016] Thirdly, this application also provides a voltage control method applied to the display panel described in the first aspect or any one of the first aspects, the method comprising: The target voltage required for the display panel is determined, and a control signal is generated based on the target voltage. The control signal includes a first control signal and a second control signal. Based on the first control signal and the second control signal, the switching element connected to the target voltage branch corresponding to the target voltage is turned on to output the target voltage to the display panel.
[0017] This application provides a display panel, a display device, and a voltage control method. The display panel includes a control unit and a voltage adjustment circuit. The voltage adjustment circuit includes a selection module and multiple voltage branches. The control unit is electrically connected to the selection module, and the selection module is connected to the output terminals of each voltage branch and the voltage adjustment circuit. The control unit is used to determine the target voltage required in the display panel and generate a control signal based on the target voltage, sending the control signal to the selection module. The selection module is used to receive the control signal output by the control unit and control the on / off connection between the target voltage branch corresponding to the target voltage and the output terminal of the voltage adjustment circuit based on the control signal. This application integrates multiple voltage branches with different voltages in the display panel. When the voltage demand changes, the control signal from the control unit can switch to the corresponding voltage branch to output the target voltage required by the display panel without changing the circuit structure. This effectively improves the voltage control efficiency of the display panel and enhances the flexibility of voltage selection control, which is beneficial for achieving precise control and saving power consumption. Attached Figure Description
[0018] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the VGH generation process; Figure 2 This is a schematic diagram of the structure of a display panel in the prior art; Figure 3This is a schematic diagram of the voltage adjustment method for display panels in the prior art; Figure 4 This is a schematic diagram of the display panel structure in one embodiment; Figure 5 This is a schematic diagram of another structure of the display panel in one embodiment. Figure 6 This is a schematic diagram of another structure of the display panel in one embodiment. Figure 7 This is a schematic diagram of another structure of the display panel in one embodiment. Figure 8 This is a schematic diagram of another structure of the display panel in one embodiment. Figure 9 This is a flowchart illustrating a voltage control method for a display panel in one embodiment.
[0019] Explanation of reference numerals in the attached figures: 10-Control unit, 20-Voltage adjustment circuit, 30-Selection module, 31-First switching element, 32-Second switching element, 33-Third switching element, 40-Voltage branch, 41-First branch, 42-Second branch, 43-Third branch, 51-First power supply, 52-Second power supply, 53-Third power supply, 54-Fourth power supply, 55-Fifth power supply, 61-First capacitor, 62-Second capacitor, 63-Third capacitor, 64-Fourth capacitor, 65-Resistor, 71-First diode, 72-Second diode, 73-Third diode, 74-Fourth diode. Detailed Implementation
[0020] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.
[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments. Furthermore, the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0023] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0024] OLED technology is widely used in various display devices due to its advantages such as high contrast, fast response, lightweight, and flexibility, especially in medium to large-sized display terminals, such as automotive center console screens, dashboards, and laptops, where the demand for OLED is increasingly significant. Therefore, compared to small-sized panels used in mobile phones and wearable devices, the design of the GOA circuit and pixel circuit of large-sized OLED panels places higher demands, one of which is the ability to dynamically adjust the VGH. VGH is the high voltage level value of the gate of the transistor in the GOA circuit and pixel circuit of the OLED display panel, playing a crucial role in pixel driving. For example, for a P-type field-effect thin-film transistor (FET), VGH corresponds to its off-state voltage.
[0025] Specifically, this is because the threshold voltage of transistors in the display panel is affected by temperature changes, causing threshold shifts. Therefore, the VGH input to the transistor gate needs to be adjusted accordingly to ensure the transistors can turn on and off normally. Additionally, there are requirements for adjusting VGH during circuit development. Furthermore, if the VGH required by the panel is much smaller than the actual available VGH, it will result in wasted power consumption. Therefore, it is necessary to implement VGH adjustment for the display panel to adapt to these different situations.
[0026] Display panels typically integrate embedded timing controllers (TEDs), power management integrated circuits (PMICs), and charge pump circuits (CPs) on their printed circuit boards (PCBs). These circuits work together to enable the display panel to function properly. The TED and PMIC can communicate via an inter-integrated circuit (IIC) bus. Figure 1 As shown, the current VGH generation process is as follows: TED, as the master device IIC, sends a control signal IIC control to the PMIC, which is the slave device IIC. The PMIC outputs a voltage signal (e.g., the power supply voltage AVDD) to the charge pump. The charge pump processes the voltage signal output by the PMIC (e.g., multiplies it by VGH=AVDD*2) and outputs it to the transistor gate of the display panel.
[0027] Currently, VGH adjustment is often achieved by changing the hardware circuit structure of the VGH control circuit (i.e., re-layouting the PCB), which suffers from high complexity and low efficiency. The following explanation uses a specific circuit that provides VGH to a P-type transistor as an example: like Figure 2 As shown, a VGH generation circuit in the prior art is provided. Pins 9, 10, 11, and 12 are pins on the PMIC, and pin 11 can provide a voltage signal of the same magnitude as PAVDD, for example, 7.6V. The circuit to the left of the PMIC is a charge pump circuit structure.
[0028] Among them, the marking "0ohm / 0402 / 5%" for resistor R25 indicates that resistor R25 has a resistance of 0 ohms, a package size of 0402, and a resistance tolerance of ±5%; the marking "NC" for resistor R24 indicates that this resistor is not connected in the circuit, that is, the path between VDD and diode D1 is open; the marking "0402_1uf_25V_X6S_10%" for capacitor C30 indicates that capacitor C30 has a package size of 0402, a capacitance of 1 microfarad, a rated voltage of 25V, a model number of X6S, and a capacitance tolerance of ±10%; the marking "NC" for capacitor C33 indicates that this capacitor is not connected in the circuit; D1 consists of two diodes connected in series, such as Schottky diodes S-LBAT54SLT1G.
[0029] In this circuit structure, the PVGH output by the charge pump is the sum of PAVDD and the voltage output from pin 11. When the voltage output from pin 11 is the same as PAVDD, PVGH = PAVDD * 2 ≈ 15V. For example, to adjust PVGH to the sum of PAVDD and VDD in this circuit structure, capacitor C30 needs to be removed, and resistor R24 and capacitor C33 need to be soldered into the circuit. That is, adjusting VGH requires removing and connecting components in the circuit, which is complex and inefficient.
[0030] For example, in this circuit structure, only a 7.6V VGH is needed for the transistor to operate normally, while the currently provided approximately 15V VGH is far greater than this requirement, resulting in wasted power consumption. In this case, if... Figure 3 As shown, the VGH required by the display panel is provided through pin 11 (CPCLK, i.e., the switching clock signal) of the power management chip PMIC. To adjust the PVGH to 7.6V, the series diode D1 needs to be removed, and the PVGH jumper needs to be connected to PAVDD. This requires adjusting the VGH by removing components and rewiring the circuit, resulting in high complexity and low efficiency. Pin 9 (VINT3) of the PMIC provides an initialization signal for the pixel circuit of the display panel, while pins 10 (PGNDC) and 12 (AGND) provide grounding signals.
[0031] Based on this, this application provides a display panel that can adjust VGH through control commands without changing the circuit structure, thereby improving the adjustment efficiency of VGH.
[0032] In one embodiment, such as Figure 4 As shown, a display panel is provided, which includes a control unit 10 and a voltage adjustment circuit 20. The voltage adjustment circuit 20 includes a selection module 30 and multiple voltage branches 40. The control unit 10 is electrically connected to the selection module 30, and the selection module 30 is connected to each voltage branch 40 and the output terminal Out of the voltage adjustment circuit 20, respectively. The control unit 10 is used to determine the target voltage required in the display panel; and generate a control signal based on the target voltage, and send the control signal to the selection module 30; the selection module 30 is used to receive the control signal output by the control unit 10, and control the on / off connection between the target voltage branch corresponding to the target voltage and the output terminal Out of the voltage adjustment circuit 20 based on the control signal.
[0033] In this embodiment, multiple voltage branches 40 capable of outputting different voltages are integrated into the display panel. The selection module 30 is selectively connected to each voltage branch 40, and connects to only one of the multiple voltage branches 40 at a time. That is, at any given time, the selection module 30 is only connected to one voltage branch 40 and outputs the voltage corresponding to that voltage branch 40. The multiple voltage branches 40 and the selection module 30 constitute a voltage adjustment circuit 20.
[0034] When the voltage requirement of the display panel changes, the control unit 10 determines the target voltage required by the display panel and outputs a control signal to the voltage adjustment circuit 20 based on the target voltage. In response to the control signal, the voltage adjustment circuit 20 adjusts its output voltage to the target voltage and outputs the target voltage from its output terminal Out. Specifically, the selection module 30 in the voltage adjustment circuit 20, in response to the control signal, selects and connects to the target voltage branch among the multiple voltage branches 40, thereby establishing a path between the target voltage branch and the output terminal Out of the voltage adjustment circuit 20, and outputting the target voltage through the target voltage branch.
[0035] In one possible implementation, the output terminal Out of the voltage adjustment circuit 20 can be connected to the gate of a transistor in the display panel to control the transistor's on and off states, thereby controlling the display effect of the display panel. Specifically, the output terminal Out of the voltage adjustment circuit 20 can be connected to the gate of a transistor in the gate driven on array (GOA) circuit of the display panel.
[0036] In this implementation, when the threshold voltage of the transistors in the display panel shifts due to temperature changes, the control unit 10 can determine a high-potential voltage VGH, i.e., the target voltage, that ensures the normal operation of the transistors, based on the shifted threshold voltage. Alternatively, when the high-potential voltage requirement of the transistor gates in the display panel changes, the target voltage is determined according to the high-potential voltage requirement. For example, during circuit development, if developers need to continuously adjust the transistor gate voltage for testing, the voltage set (selected or input) by the developers can be used as the target voltage. Another example is when the display panel has different high-potential voltage requirements in different display modes; the target voltage can be determined according to the display mode of the display panel (specifically, a pre-defined correspondence between different display modes and target voltages can be established).
[0037] The control unit 10 can pre-store the voltages corresponding to each voltage branch 40, as well as control signals instructing the selection module 30 to connect to different voltage branches 40. After determining the target voltage, the control unit 10 can first identify at least one candidate voltage branch whose voltage reaches the target voltage (i.e., the voltage is greater than or equal to the target voltage), then select the target voltage branch from the at least one candidate voltage branch, and output the control signal corresponding to the target voltage branch to the selection module 30. Specifically, the control unit 10 can sort at least one candidate voltage branch according to the order of voltage from smallest to largest, and determine the candidate voltage branch ranked first as the target voltage branch; that is, determine the candidate voltage branch whose voltage is closest to the target voltage as the target voltage branch, so as to achieve precise control and power saving. After receiving the control signal, the selection module 30 switches to the voltage branch 40 corresponding to the control signal, conducts the path between the target voltage branch and the transistor gate, so that the target voltage branch outputs the target voltage to the transistor gate.
[0038] The display panel provided in this embodiment includes a control unit 10 and a voltage adjustment circuit 20. The voltage adjustment circuit 20 includes a selection module 30 and multiple voltage branches 40. The control unit 10 is electrically connected to the selection module 30, and the selection module 30 is connected to each voltage branch 40 and the output terminal Out of the voltage adjustment circuit 20. The control unit 10 is used to determine the target voltage required in the display panel and generate a control signal based on the target voltage, and send the control signal to the selection module 30. The selection module 30 is used to receive the control signal output by the control unit 10 and control the connection and disconnection between the target voltage branch corresponding to the target voltage and the output terminal Out of the voltage adjustment circuit 20 based on the control signal. This embodiment integrates multiple voltage branches 40 with different voltages in the display panel. When the voltage requirement changes, the control signal from the control unit 10 can switch to the corresponding voltage branch 40 to output the target voltage required by the display panel without changing the circuit structure. This effectively improves the voltage control efficiency of the display panel and enhances the flexibility of voltage selection control, which is beneficial for achieving precise control and saving power consumption.
[0039] In one embodiment, the control unit 10 may be an embedded timing controller TED of the display panel, and the voltage adjustment circuit 20 may be integrated inside the power management chip PMIC of the display panel.
[0040] In this embodiment, the control unit 10 may be the embedded timing controller TED of the display panel. Considering the connection method between TED and PMIC based on the integrated circuit bus, the voltage adjustment circuit 20 may be integrated into the power management chip PMIC of the display panel to reuse the integrated circuit bus connecting PMIC and TED, thereby improving the voltage control efficiency of the display panel.
[0041] Specifically, such as Figure 5 As shown, the selection module 30 includes a first input terminal A0 and a second input terminal A1. The control unit 10 is connected to the first input terminal A0 of the selection module 30 via the serial data line SDA of the integrated circuit bus, and to the second input terminal A1 of the selection module 30 via the serial clock line SCL of the integrated circuit bus. The control unit 10 is used to send control signals to the selection module 30 via the serial data line SDA and the serial clock line SCL of the integrated circuit bus to instruct the selection module 30 to open the path between the target voltage branch corresponding to the target voltage and the output terminal Out of the voltage adjustment circuit 20.
[0042] In this embodiment of the application, the control signal may include a first control signal and a second control signal. The control unit 10 outputs the first control signal to the selection module 30 through the serial data line SDA and the second control signal to the selection module 30 through the serial clock line SCL.
[0043] The control unit 10 can pre-store the voltages corresponding to each voltage branch 40, as well as the correspondence between different combinations of the first and second control signals and the different voltage branches 40. For example, the first control signal can be 1 or 0; the second control signal can be 0 or 1. The combination of the first and second control signals can be 11, 10, 01, or 00. Here, 1 can be a high-level signal, and 0 can be a low-level signal.
[0044] After determining the target voltage, the control unit 10 identifies the voltage branch 40 among multiple voltage branches 40 whose voltage reaches and is closest to the target voltage as the target voltage branch. Then, it determines the combination of a first control signal and a second control signal corresponding to the target voltage branch from a pre-stored correspondence. The first control signal is sent to the selection module 30 via the serial data line SDA, and the second control signal is sent to the selection module 30 via the serial clock line SCL. In response to the first and second control signals, the selection module 30 switches to connect to the corresponding target voltage branch, establishing a path between the target voltage branch and the output terminal Out of the voltage adjustment circuit 20, and outputs the target voltage required by the display panel.
[0045] In the embodiment of this application, the control unit 10 in the display panel can be the embedded timing controller TED of the display panel, and the voltage adjustment circuit 20 can be integrated inside the power management chip PMIC of the display panel to reuse the integrated circuit bus connecting the PMIC and TED, so that the control unit 10 can output control signals to the voltage adjustment circuit 20 through the integrated circuit bus, effectively improving the integration of the display panel and the voltage control efficiency.
[0046] In one possible implementation, the control unit 10 can also be connected to the selection module 30 via control pins. Specifically, it can be connected to the first input terminal A0 of the selection module 30 via the first control pin GPIO1, and to the second input terminal A1 of the selection module 30 via the second control pin GPIO2; and outputs a first control signal to the selection module via the first control pin GPIO1, and outputs a second control signal to the selection module 30 via the second control pin GPIO2.
[0047] In one embodiment, such as Figure 6 As shown, the selection module 30 includes a first switching element 31, a second switching element 32, and a third switching element 33. The first end of each switching element is connected to the output end of each voltage branch 40, and the second end of each switching element is connected to the output end Out of the voltage adjustment circuit 20. The switching element is used to open the path between the voltage branch 40 and the output end Out of the voltage adjustment circuit 20 when the corresponding voltage branch 40 is the target voltage branch indicated by the control signal.
[0048] In this embodiment, the selection module 30 may include multiple switching elements, the number of which may be the same as the number of voltage branches 40. The first end of each switching element is connected to the output end of each voltage branch 40, and the second end of each switching element is connected to the output end Out of the voltage adjustment circuit 20. That is, each switching element is connected between the voltage branch 40 and the output end Out of the voltage adjustment circuit 20, so as to control the opening and closing of the path between the voltage branch 40 and the output end Out of the voltage adjustment circuit 20 through its own conduction and cutoff.
[0049] Specifically, the selection module 30 may include a first switching element 31, a second switching element 32, and a third switching element 33. The first terminal of the first switching element 31, the first terminal of the second switching element 32, and the first terminal of the third switching element 33 are respectively connected to the output terminal of each voltage branch 40; the second terminal of the first switching element 31, the second terminal of the second switching element 32, and the second terminal of the third switching element 33 are respectively connected to the output terminal Out of the voltage adjustment circuit 20.
[0050] Upon receiving a control signal from the control unit 10, the selection module 30 instructs the switching element connected to the target voltage branch corresponding to the control signal to be turned on, thereby establishing a path between the target voltage branch and the output terminal Out of the voltage adjustment circuit 20, and providing the target voltage to the output terminal Out of the voltage adjustment circuit 20. Simultaneously, other switching elements are kept off to prevent the voltages of multiple voltage branches 40 from being simultaneously output to the output terminal Out of the voltage adjustment circuit 20, thus enabling selective connection of the voltage adjustment circuit 20 to multiple voltage branches 40 to ensure the accuracy of voltage control on the display panel.
[0051] In one possible implementation, after the voltage control of the display panel is completed based on the target voltage of the target voltage branch, the switching element corresponding to the target voltage branch can be instructed to open, or the switching element can be automatically opened after a preset period of time, so as to avoid affecting the voltage of the output terminal Out of the voltage adjustment circuit 20 when the voltage of the display panel is subsequently controlled based on the voltage of other voltage branches 40.
[0052] In one possible implementation, the selection module 30 can be a multiplexer, such as the ADG5204 chip. Internally, it includes four CMOS transmission gates S1, S2, S3, and S4 (which function as switching elements), and two control terminals N1 and N2. The signal combination of the two control terminals N1 and N2 can control the selection of the four transmission gates. In this embodiment, three of the transmission gates S1, S2, and S3 can be used. Specifically, S1 is the first switching element 31, S2 is the second switching element 32, and S3 is the third switching element 33. The control terminal N1 is the first input terminal A0, and N2 is the second input terminal A1.
[0053] The control relationships between control terminals N1 and N2 and the three transmission gates S1, S2, and S3 can be shown in Table 1 below: Table 1
[0054] When the signal combination of the two control terminals N1 and N2 input to the ADG5204 chip is 00, the transmission gate S1 is turned on, that is, the first switching element 31 is turned on; when the signal combination of the two control terminals N1 and N2 input to the ADG5204 chip is 10, the transmission gate S2 is turned on, that is, the second switching element 32 is turned on; when the signal combination of the two control terminals N1 and N2 input to the ADG5204 chip is 01, the transmission gate S3 is turned on, that is, the third switching element 33 is turned on.
[0055] In one embodiment, such as Figure 6 As shown, when the switching elements include a first switching element 31, a second switching element 32, and a third switching element 33, the multiple voltage branches 40 may include a first branch 41, a second branch 42, and a third branch 43. The voltage output by the first branch 41 is a multiple of the first power supply voltage V1, the voltage output by the second branch 42 is the sum of the first power supply voltage V1 and the second power supply voltage V2, and the voltage output by the third branch 43 is the first power supply voltage V1.
[0056] In this embodiment of the application, the output terminal of the first branch 41 can be connected to the first terminal of the first switching element 31, the output terminal of the second branch 42 can be connected to the first terminal of the second switching element 32, and the output terminal of the third branch 43 can be connected to the first terminal of the third switching element 33. The first switching element 31 is turned on when the first branch 41 is the target voltage branch, so as to connect the first branch 41 and the output terminal Out of the voltage adjustment circuit 20, so that the first branch 41 provides a voltage to the output terminal Out of the voltage adjustment circuit 20 with a voltage magnitude that is a multiple of the first power supply voltage; the second switching element 32 is turned on when the second branch 42 is the target voltage branch, so as to connect the second branch 42 and the output terminal Out of the voltage adjustment circuit 20, so that the second branch 42 provides a voltage to the output terminal Out of the voltage adjustment circuit 20 with a voltage magnitude that is the sum of the first power supply voltage and the second power supply voltage; the third switching element 33 is turned on when the third branch 43 is the target voltage branch, so as to connect the third branch 43 and the output terminal Out of the voltage adjustment circuit 20, so that the third branch 43 provides the first power supply voltage to the output terminal Out of the voltage adjustment circuit 20.
[0057] The first power supply voltage and the second power supply voltage are different. For the scenario of adjusting the high voltage level VGH of the transistors in the display panel, considering the range of the required high voltage level VGH of the transistors, the first power supply voltage and the second power supply voltage in this application can be the voltages that supply power to the chips (e.g., control units) in the display panel. Their voltage values match the required range of VGH. While ensuring the accuracy of voltage control of the display panel, reusing the power supply voltage (of the control unit) in the display panel can reduce the structural complexity of the display panel.
[0058] Furthermore, considering that the analog and digital circuit modules of the control unit 10 have different requirements for power supply voltage ranges, the power supply voltage of the analog circuit module, the power supply voltage of the digital circuit module, and the combination of their power supply voltages all match the required range of VGH. Therefore, the first power supply voltage V1 can be the power supply voltage for the analog circuit section of the control unit 10, for example, it can be the analog voltage AVDD. The second power supply voltage V2 can be the power supply voltage for the digital circuit section of the control unit 10, for example, it can be the core / interface voltage (VCI).
[0059] The first power supply voltage V1 and the second power supply voltage V2 can be provided by the power management chip PMIC or by an external power supply; this application does not impose any restrictions on this.
[0060] The voltage provided by the first branch 41 can be a multiple of the first power supply voltage, which can be twice the first power supply voltage. When the control unit 10 is TED, for example, the first power supply voltage can be 7.6V and the second power supply voltage can be 3.3V. Then, the first branch 41 can provide a voltage of 7.6*2=15.2V, the second branch 42 can provide a voltage of 7.6+3.3=10.9V, and the third branch 43 can provide a voltage of 7.6V.
[0061] In one embodiment, such as Figure 7 As shown, the first branch 41 includes a first power supply 51, a second power supply 52, a first capacitor 61, a second capacitor 62, a first diode 71, and a second diode 72. The anode of the first power supply 51 is connected to the first terminal of the first diode 71, and the anode of the second power supply 52 is connected to the first terminal of the first capacitor 61. The cathodes of the first power supply 51 and the second cathode of the second power supply 52 are both grounded. The second terminal of the first diode 71 and the second terminal of the first capacitor 61 are connected to the first terminal of the second diode 72. The first terminal of the second capacitor 62 is grounded, and the second terminal of the second capacitor 62 and the second terminal of the second diode 72 are connected to the first terminal of the first switching element 31.
[0062] The first power supply 51 and the second power supply 52 can be power supplies for the control unit 10. The first capacitor 61 and the second capacitor 62 have a filtering function. The first diode 71 and the second diode 72 can prevent the second capacitor 62 from charging the second power supply 52 in reverse, and the first diode 71 can prevent the first capacitor 61 and the second capacitor 62 from charging the first power supply 51 in reverse.
[0063] The second branch 42 includes a third power supply 53, a fourth power supply 54, a third capacitor 63, a fourth capacitor 64, a third diode 73, and a fourth diode 74. The anode of the third power supply 53 is connected to the first terminal of the third diode 73, and the anode of the fourth power supply 54 is connected to the first terminal of the third capacitor 63. The cathodes of the third power supply 53 and the fourth power supply 54 are both grounded. The second terminal of the third diode 73 and the second terminal of the third capacitor 63 are connected to the first terminal of the fourth diode 74. The first terminal of the fourth capacitor 64 is grounded, and the second terminal of the fourth capacitor 64 and the second terminal of the fourth diode 74 are connected to the first terminal of the second switching element 32.
[0064] The third power supply 53 can be used to power the control unit 10, and the fourth power supply 54 can be used to power the display panel. The third capacitor 63 and the fourth capacitor 64 have a filtering function. The third diode 73 and the fourth diode 74 can prevent the fourth capacitor 64 from charging the fourth power supply 54 in reverse, and the third diode 73 can prevent the third capacitor 63 and the fourth capacitor 64 from charging the third power supply 53 in reverse.
[0065] The third branch 43 includes a fifth power supply 55 and a resistor 65. The anode of the fifth power supply 55 is connected to the first end of the resistor 65, the cathode of the fifth power supply 55 is grounded, and the second end of the resistor 65 is connected to the first end of the third switching element 33.
[0066] The fifth power supply 55 can be a power supply for the control unit 10. Resistor 65 can provide overcurrent and short-circuit protection for the third branch 43.
[0067] In one possible implementation, the voltages of the first power supply 51, the second power supply 52, the third power supply 53, the fourth power supply 54, and the fifth power supply 55 can all be different. The specific voltage of each power supply can be flexibly set according to the needs of the display panel.
[0068] In one possible implementation, the voltages of the first power supply 51, the second power supply 52, the third power supply 53, the fourth power supply 54, and the fifth power supply 55 can be partially the same. That is, the first power supply 51, the second power supply 52, the third power supply 53, and the fifth power supply 55 can all be power supply V1 supplying power to the control unit 10; the fourth power supply 54 can be power supply V2 supplying power to the display panel. In this case, the structure of the display panel can be as follows: Figure 8 As shown.
[0069] In one embodiment, Table 2 below shows a comparison of the current of the display panel in the prior art and in this application. The current of the display panel in this application is significantly reduced, meaning that the display panel structure provided in this application can effectively avoid situations such as high current, thus ensuring the safety of the display panel.
[0070]
[0071] Wherein, VCI(mA) represents the driving current in the pixel circuit of the display panel; Before(mA) represents the driving current of the display panel in the prior art; After(mA) represents the driving current of the display panel in this application; and DIFF(%) represents the difference between the driving current of the display panel in this application and that of the display panel in the prior art.
[0072] The DIFF (%) in the table, or Difference, indicates that, with the same VGH, the driving current in this application is significantly reduced compared to the prior art, thereby effectively reducing the power consumption of the pixel circuit and the display panel.
[0073] In one embodiment, a display device is provided, comprising the display panel shown in the above embodiment. The display panel includes a control unit 10 and a voltage adjustment circuit 20. The voltage adjustment circuit 20 includes a selection module 30 and a plurality of voltage branches 40. The control unit 10 is electrically connected to the selection module 30, and the selection module 30 is connected to each voltage branch 40 and the output terminal Out of the voltage adjustment circuit 20, respectively. The control unit 10 is used to determine the target voltage required in the display panel; and generate a control signal based on the target voltage, and send the control signal to the selection module 30; the selection module 30 is used to receive the control signal output by the control unit 10, and control the on / off connection between the target voltage branch corresponding to the target voltage and the output terminal Out of the voltage adjustment circuit 20 based on the control signal.
[0074] In this embodiment, when the voltage requirement of the display panel changes, the control unit 10 determines the target voltage required by the display panel and outputs a control signal to the voltage adjustment circuit 20 based on the target voltage. The voltage adjustment circuit 20 adjusts its output voltage to the target voltage in response to the control signal and then outputs the target voltage from its output terminal Out. Specifically, the selection module 30 in the voltage adjustment circuit 20, in response to the control signal, selects and connects to the target voltage branch among the multiple voltage branches 40, thereby establishing a path between the target voltage branch and the output terminal Out of the voltage adjustment circuit 20, and outputting the target voltage through the target voltage branch.
[0075] Specifically, the control unit 10 can pre-store the voltages corresponding to each voltage branch 40, as well as control signals instructing the selection module 30 to connect to different voltage branches 40. After determining the target voltage, the control unit 10 can first identify at least one candidate voltage branch whose voltage reaches the target voltage (i.e., the voltage is greater than or equal to the target voltage), then select the target voltage branch from the at least one candidate voltage branch, and output the control signal corresponding to the target voltage branch to the selection module 30. Specifically, the control unit 10 can sort the at least one candidate voltage branch according to the order of voltage from smallest to largest, and determine the candidate voltage branch ranked first as the target voltage branch; that is, determine the candidate voltage branch whose voltage is closest to the target voltage as the target voltage branch, so as to achieve precise control and power saving. After receiving the control signal, the selection module 30 switches to the voltage branch 40 corresponding to the control signal, conducts the path between the target voltage branch and the transistor gate, so that the target voltage branch outputs the target voltage to the transistor gate.
[0076] The display device provided in this application includes a display panel, which includes a control unit 10 and a voltage adjustment circuit 20. The voltage adjustment circuit 20 includes a selection module 30 and multiple voltage branches 40. The control unit 10 is electrically connected to the selection module 30, and the selection module 30 is connected to each voltage branch 40 and the output terminal Out of the voltage adjustment circuit 20. The control unit 10 is used to determine the target voltage required in the display panel and generate a control signal based on the target voltage, and send the control signal to the selection module 30. The selection module 30 is used to receive the control signal output by the control unit 10 and control the connection and disconnection between the target voltage branch corresponding to the target voltage and the output terminal Out of the voltage adjustment circuit 20 based on the control signal. This application integrates multiple voltage branches 40 with different voltages in the display panel of the display device. When the voltage requirement changes, the control signal from the control unit 10 can switch to the corresponding voltage branch 40 to output the target voltage required by the display panel without changing the circuit structure, effectively improving the voltage control efficiency of the display panel, thereby improving the voltage control efficiency and display effect of the display device, and also improving the flexibility of voltage selection control, which is conducive to achieving precise control and saving power consumption.
[0077] In one embodiment, a voltage control method is provided, which is applied to the display panel described in the above embodiment. The method includes, for example... Figure 9 The steps shown are as follows: Step 101: Determine the target voltage required for the display panel and generate a control signal based on the target voltage.
[0078] The control signals include a first control signal and a second control signal.
[0079] In this embodiment, when the voltage requirement of the display panel changes, the control unit 10 in the display panel determines the target voltage required by the display panel, generates a control signal based on the target voltage, and outputs the control signal to the voltage adjustment circuit 20.
[0080] The control unit 10 can pre-store the voltages corresponding to each voltage branch 40, as well as the correspondence between different combinations of the first and second control signals and the different voltage branches 40. For example, the first control signal can be 1 or 0; the second control signal can be 0 or 1. Then the combination of the first and second control signals can be 11, 10, 01, or 00.
[0081] After determining the target voltage, the control unit 10 can identify the voltage branch 40 among multiple voltage branches 40 whose voltage reaches and is closest to the target voltage as the target voltage branch. Then, it determines the combination of the first control signal and the second control signal corresponding to the target voltage branch from the pre-stored correspondence, and sends the first control signal to the selection module 30 through the serial data line SDA, and the second control signal to the selection module 30 through the serial clock line SCL.
[0082] Step 102: Based on the first control signal and the second control signal, turn on the switching element connected to the target voltage branch corresponding to the target voltage to output the target voltage to the display panel.
[0083] In this embodiment, the voltage adjustment circuit 20 in the display panel adjusts the output voltage to the target voltage in response to a control signal, and then outputs the target voltage from the output terminal Out. Specifically, the selection module 30 in the voltage adjustment circuit 20, in response to a first control signal and a second control signal, switches the corresponding switching element of the target voltage branch to open the path between the target voltage branch and the output terminal Out of the voltage adjustment circuit 20, thereby outputting the target voltage required by the display panel.
[0084] The voltage control method provided in this application embodiment can adjust the voltage of the display panel by means of the control signal output by the control unit 10 in the display panel, without changing the circuit structure in the display panel, which effectively improves the voltage control efficiency of the display panel, thereby improving the voltage control efficiency and display effect of the display device.
[0085] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.
Claims
1. A display panel, characterized in that, The display panel includes a control unit and a voltage adjustment circuit. The voltage adjustment circuit includes a selection module and multiple voltage branches. The control unit is electrically connected to the selection module, and the selection module is connected to each of the voltage branches and the output terminal of the voltage adjustment circuit. The control unit is used to determine the target voltage required in the display panel; and generate a control signal based on the target voltage, and send the control signal to the selection module; The selection module is used to receive the control signal output by the control unit, and control the connection and disconnection between the target voltage branch corresponding to the target voltage and the output terminal of the voltage adjustment circuit based on the control signal.
2. The display panel according to claim 1, characterized in that, The control unit is connected to the first input terminal of the selection module via the serial data line of the integrated circuit bus, and to the second input terminal of the selection module via the serial clock line of the integrated circuit bus. The control unit is configured to send the control signal to the selection module via the serial data line and the serial clock line of the integrated circuit bus, so as to instruct the selection module to open the path between the target voltage branch corresponding to the target voltage and the output terminal of the voltage adjustment circuit.
3. The display panel according to claim 1, characterized in that, The selection module includes a first switching element, a second switching element, and a third switching element. The first end of each switching element is connected to the output end of each voltage branch, and the second end of each switching element is connected to the output end of the voltage adjustment circuit. The switching element is used to connect the voltage branch and the output terminal of the voltage adjustment circuit when the corresponding voltage branch is the target voltage branch indicated by the control signal.
4. The display panel according to claim 3, characterized in that, The plurality of voltage branches include a first branch, a second branch, and a third branch. The voltage output by the first branch is a multiple of the first power supply voltage. The voltage output by the second branch is the sum of the first power supply voltage and the second power supply voltage. The voltage output by the third branch is the first power supply voltage. The first power supply voltage and the second power supply voltage are different.
5. The display panel according to claim 4, characterized in that, The first power supply voltage is used to power the analog circuit module of the control unit, and the second power supply voltage is used to power the digital circuit module of the control unit.
6. The display panel according to claim 4, characterized in that, The first branch includes a first power supply, a second power supply, a first capacitor, a second capacitor, a first diode, and a second diode. The anode of the first power supply is connected to the first terminal of the first diode, the anode of the second power supply is connected to the first terminal of the first capacitor, the second terminal of the first diode and the second terminal of the first capacitor are connected to the first terminal of the second diode, the first terminal of the second capacitor is grounded, and the second terminal of the second capacitor and the second terminal of the second diode are connected to the first terminal of the first switching element.
7. The display panel according to claim 4, characterized in that, The second branch includes a third power supply, a fourth power supply, a third capacitor, a fourth capacitor, a third diode, and a fourth diode. The anode of the third power supply is connected to the first terminal of the third diode, the anode of the fourth power supply is connected to the first terminal of the third capacitor, the second terminal of the third diode and the second terminal of the third capacitor are connected to the first terminal of the fourth diode, the first terminal of the fourth capacitor is grounded, and the second terminal of the fourth capacitor and the second terminal of the fourth diode are connected to the first terminal of the second switching element.
8. The display panel according to claim 4, characterized in that, The third branch includes a fifth power supply and a resistor. The anode of the fifth power supply is connected to the first end of the resistor, and the second end of the resistor is connected to the first end of the third switching element.
9. The display panel according to claim 1, characterized in that, The voltage adjustment circuit is integrated into the power management chip of the display panel.
10. A display device, characterized in that, The display device includes a display panel as described in any one of claims 1-9.
11. A voltage control method, characterized in that, Applied to the display panel according to any one of claims 1-9, the method comprises: The target voltage required for the display panel is determined, and a control signal is generated based on the target voltage, the control signal including a first control signal and a second control signal; Based on the first control signal and the second control signal, the switching element connected to the target voltage branch corresponding to the target voltage is turned on to output the target voltage to the display panel.