Voltage compensation circuit, method, driving device and display device

Abstract

This application discloses a voltage compensation circuit, method, driving device, and display device. The voltage compensation circuit includes a controller and a voltage compensation module. The controller receives pixel data and outputs a first control signal when the load state of the display screen corresponding to the pixel data is a target load state, and outputs a second control signal when the load state of the display screen corresponding to the pixel data is a non-target load state. The voltage compensation module is connected to a power management chip and the controller. The voltage compensation module outputs a first common voltage from the power management chip according to the first control signal, or compensates the first common voltage according to the second control signal and outputs a second common voltage. This application can effectively prevent circuit malfunctions due to high temperature, thereby improving the safety and reliability of the circuit.

Description

Technical Field

[0001] This application relates to the field of driving technology, specifically to a voltage compensation circuit, method, driving device, and display device. Background Technology

[0002] Due to the in-plane manufacturing process, parasitic capacitance is unavoidable between the pixel data (Data) traces and the common voltage (Vcom) traces in LCD displays. When the display panel displays certain images, the pixel data (Data) jumps from a high grayscale voltage to a low grayscale voltage, or vice versa. This data voltage jump is coupled to the common voltage through parasitic capacitance (i.e., the common voltage is coupled by the data voltage), and changes in the common voltage can cause crosstalk phenomena such as uneven brightness in the displayed image.

[0003] Currently, the common circuit design uses operational amplifiers to compensate for the common voltage supplied to the display panel. However, this compensation circuit suffers from overheating issues under heavy load conditions, which can easily lead to malfunctions and affect the normal operation of LCD (Liquid-Crystal Display) products. Summary of the Invention

[0004] This application provides a voltage compensation circuit, method, driving device, and display device, which can effectively alleviate the problem of excessive temperature in the voltage compensation circuit under heavy load conditions when the display screen is under load.

[0005] This application provides a voltage compensation circuit applied in a display device. The display device includes a power management chip, and the voltage compensation circuit includes a controller and a voltage compensation module. The controller receives pixel data and outputs a first control signal when the load state of the display screen corresponding to the pixel data is a target load state, and outputs a second control signal when the load state of the display screen corresponding to the pixel data is a non-target load state. The voltage compensation module is connected to the power management chip and the controller, and is used to output a first common voltage output by the power management chip according to the first control signal, or to compensate the first common voltage output by the power management chip according to the second control signal and output a second common voltage.

[0006] In some embodiments of the voltage compensation circuit, the voltage compensation module includes a first branch and an output terminal. The first branch is connected to the controller, the power management chip and the output terminal respectively. The first branch is used to output a first common voltage through the output terminal according to a first control signal.

[0007] In some embodiments of the voltage compensation circuit, the voltage compensation module further includes a second branch, which is connected to the controller, the power management chip and the output terminal respectively. The second branch is used to compensate the first common voltage to the second common voltage according to the second control signal and then output it through the output terminal.

[0008] In some embodiments of the voltage compensation circuit, the first branch includes a first switching transistor, a first terminal of the first switching transistor is connected to a controller, a second terminal of the first switching transistor is connected to a power management chip, and a third terminal of the first switching transistor is connected to an output terminal.

[0009] In some embodiments of the voltage compensation circuit, the second branch includes a second switching transistor and an operational amplifier. The first terminal of the second switching transistor is connected to the controller, the second terminal of the second switching transistor is energized, the third terminal of the second switching transistor is connected to the power supply terminal of the operational amplifier, the non-inverting input terminal of the operational amplifier is connected to the power management chip, and the output terminal of the operational amplifier is connected to the output terminal.

[0010] In some embodiments of the voltage compensation circuit, the first switch is turned on according to the first control signal, and the second switch is turned off according to the first control signal; the first switch is turned off according to the second control signal, and the second switch is turned on according to the second control signal.

[0011] This application embodiment also provides a driving device, which includes a power management chip and the voltage compensation circuit described above, with the voltage compensation circuit connected to the power management chip.

[0012] This application also provides a display device, which includes a display screen and the aforementioned driving device, wherein the voltage compensation circuit in the driving device is connected to the display screen.

[0013] This application also provides a voltage compensation method applied in a display device. The display device includes a display screen, a power management chip, and a voltage compensation circuit. The voltage compensation circuit includes a controller and a voltage compensation module. The voltage compensation method controls the controller to receive pixel data. When the load state of the display screen corresponding to the pixel data is a target load state, the controller outputs a first control signal. When the load state of the display screen corresponding to the pixel data is a non-target load state, the controller outputs a second control signal. The voltage compensation module outputs a first common voltage to the display screen according to the first control signal, or compensates the first common voltage output by the power management chip according to the second control signal and outputs a second common voltage to the display screen.

[0014] In some embodiments of the voltage compensation method, the voltage compensation module includes a first branch, an output terminal, and a second branch. The voltage compensation module is controlled to output a first common voltage according to a first control signal, or to compensate the first common voltage according to a second control signal and then output a second common voltage. When the controller outputs the first control signal, the first branch is controlled to output the first common voltage to the display screen through the output terminal; when the controller outputs the second control signal, the second branch is controlled to compensate the first common voltage and then output the second common voltage to the display screen.

[0015] This application provides a voltage compensation circuit, method, driving device, and display device. The voltage compensation circuit outputs a first common voltage from the power management chip according to a first control signal, or compensates the first common voltage according to a second control signal and outputs a second common voltage. When the load state of the displayed screen is the target load state, the voltage compensation circuit directly outputs the first common voltage from the power management chip to the display screen without participating in the compensation process for the first common voltage. This avoids the voltage compensation circuit malfunctioning due to excessive temperature when the displayed screen is in the target load state, thereby ensuring the safety and reliability of the entire compensation circuit. Attached Figure Description

[0016] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of a first structure of the voltage compensation circuit provided in an embodiment of this application.

[0018] Figure 2 This is a structural block diagram of the voltage compensation module in the voltage compensation circuit provided in the embodiments of this application.

[0019] Figure 3 The circuit diagram of the voltage compensation module in the voltage compensation circuit provided in the embodiment of this application is shown.

[0020] Figure 4 This is a schematic flowchart of the voltage compensation method provided in an embodiment of this application.

[0021] Figure 5 This is a flowchart illustrating step 102 of the voltage compensation method provided in the embodiments of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] 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. Features thus defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] Please see Figure 1 , Figure 1 A structural block diagram of a voltage compensation circuit is provided for embodiments of this application. The voltage compensation circuit provided in this application is applied in a display device, which includes a power management chip 10 and a display screen 30; the voltage compensation circuit includes a controller 21 and a voltage compensation module 22, the controller 21 being connected to the voltage compensation module 22, and the voltage compensation module 22 also being connected to the power management chip 10 and the display screen 30.

[0025] The controller 21 receives pixel data and outputs a first control signal when the load state of the display screen corresponding to the pixel data is the target load state, and outputs a second control signal when the load state of the display screen corresponding to the pixel data is not the target load state. In this embodiment, the target load state is the heavy load state, that is, when the controller 21 detects that the load state of the display screen corresponding to the pixel data is the heavy load state, it outputs the first control signal; otherwise, it outputs the second control signal. The voltage compensation module 22 outputs the first common voltage Vcom1 output by the power management chip 10 according to the first control signal, or compensates the first common voltage Vcom1 to the second common voltage Vcom2 according to the second control signal. That is, when the display screen is in the heavy load state, the voltage compensation module 22 directly outputs the first common voltage Vcom1 output by the power management chip 10 to the display screen 30 without participating in the compensation processing of the first common voltage Vcom1, thereby avoiding the problem of the voltage compensation module 22 overheating under the heavy load state, thus ensuring the safety and reliability of the entire compensation circuit.

[0026] Please see Figure 2 , Figure 2This is a structural block diagram of the voltage compensation module 22 in the voltage compensation circuit provided in this application embodiment. The voltage compensation module 22 includes a first branch 221 and an output terminal 2212. The first branch 221 is connected to the controller 21, the power management chip 10, and the output terminal, respectively. The first branch 221 is used to output the first common voltage Vcom1 through the output terminal 2212 according to the first control signal; that is, when the load state of the displayed screen is under heavy load, the first branch 221 directly outputs the first common voltage Vcom1 output by the power control chip to the display screen 30, without participating in the compensation processing of the common voltage.

[0027] In some embodiments, the voltage compensation module 22 further includes a second branch 222, which is connected to the controller 21, the power management chip 10, and the output terminal 2212. The second branch 222 is used to compensate the first common voltage Vcom1 to a second common voltage Vcom2 according to the second control signal and then output it through the output terminal 2212. When the load state of the display screen is not a heavy load state, the second branch 222 compensates the first common voltage Vcom1 and outputs the second common voltage Vcom2. At this time, the first branch 221 does not participate in the operation. When the load state of the display screen is a heavy load state, the first branch 221 directly outputs the first common voltage Vcom1 to the display screen 30. At this time, the second branch 222 does not participate in the operation and does not perform compensation processing on the first common voltage Vcom1. That is, in this embodiment, by setting two output branches for the common voltage, different branches are selected to output the common voltage according to the load state of the display screen, so as to avoid the voltage compensation circuit from overheating and malfunctioning when the display screen is under heavy load.

[0028] Please see Figure 3 , Figure 3 This is a circuit diagram of the voltage compensation module 22 in the voltage compensation circuit provided in this application embodiment. In one embodiment, the first branch 221 includes a first switch 2211. The first terminal of the first switch 2211 is connected to the controller 21, the second terminal of the first switch 2211 is connected to the power management chip 10, and the third terminal of the first switch 2211 is connected to the output terminal 2212. In this embodiment, the first switch 2211 is turned on according to the first control signal to output the first common voltage Vcom1 to the display screen 30. When the controller 21 outputs a second control signal, the first switch 2211 is turned off according to the second control signal, disconnecting the output of this branch.

[0029] As one embodiment, the second branch 222 includes a second switch 2221 and an operational amplifier 2222. The first end of the second switch 2221 is connected to the controller 21, the second end of the second switch 2221 is powered, the third end of the second switch 2221 is connected to the power supply terminal of the operational amplifier 2222, the non-inverting input terminal of the operational amplifier 2222 is connected to the power management chip 10, and the output terminal of the operational amplifier 2222 is connected to the output terminal 2212.

[0030] In this embodiment, the second switch 2221 is turned off according to the first control signal and turned on according to the second control signal. When the second switch 2221 is turned on, the operational amplifier 2222 receives power. At this time, the operational amplifier 2222 amplifies the first common voltage Vcom1 output by the power control chip to compensate for the first common voltage Vcom1, and the first branch 221 is turned on. When the second switch 2221 is turned off, the power to the operational amplifier 2222 is cut off, making the operational amplifier 2222 unable to work, and thus unable to compensate for the first common voltage Vcom1. Therefore, the second branch 222 is turned off.

[0031] In one implementation, both the first switch 2211 and the second switch 2221 in this embodiment are MOSFETs, but their types are opposite. For example, the first switch 2211 is an N-channel MOSFET, and the second switch 2221 is a P-channel MOSFET. The first terminal of the first switch 2211 is the gate of the MOSFET, the second terminal is the source of the MOSFET, and the third terminal is the drain of the MOSFET; similarly, the first terminal of the second switch 2221 is the gate of the MOSFET, the second terminal is the drain of the MOSFET, and the third terminal is the source of the MOSFET. By using two MOSFETs with opposite channel types in this embodiment, both MOSFETs can be controlled by the same port of the controller 21. When the controller 21 turns on one MOSFET, the other MOSFET is turned off, thereby effectively selecting the output branch of the two common voltages, simplifying the circuit structure, and improving the flexibility of the voltage compensation circuit.

[0032] As one embodiment, the controller 21 in this embodiment can be a SOC or a TCON IC. SOC is an abbreviation for System on Chip, often simply called a "system-on-a-chip." TCON IC is a logic board, also known as a screen driver board, and serves as the central control board. The controller 21 is a system or product formed by combining multiple integrated circuits with specific functions on a single chip, containing a complete hardware system and its embedded software. When the controller 21 detects that the load state of the display screen corresponding to the pixel data is a heavy load state, it outputs a first control signal (high level in this embodiment). At this time, the first switch 2211 is turned on and the second switch 2221 is turned off. The operational amplifier 2222 does not work, and the first common voltage Vcom1 is directly output through the first switch 2211. When the controller 21 detects that the load state of the display screen corresponding to the pixel data is not a heavy load state, the controller 21 outputs a second control signal (low level in this embodiment). At this time, the first switch 2211 is turned off and the second switch 2221 is turned on. The first common voltage Vcom1 is amplified by the operational amplifier 2222 to obtain the second common voltage Vcom2, which is then output to the display screen 30. This effectively avoids the voltage compensation circuit from overheating and causing abnormalities when the display screen is under heavy load conditions.

[0033] This application embodiment also provides a driving device, which includes a power management chip 10 and the aforementioned power compensation circuit. The voltage compensation circuit is connected to the power management chip 10 and outputs the common voltage from the power management chip 10 to the display screen 30 to ensure the normal operation of the display screen 30. Since the voltage compensation circuit has been described in detail above, it will not be repeated here.

[0034] This application also provides a display device, which includes a display screen and the aforementioned driving device. The display screen is connected to a voltage compensation circuit in the driving device, and the voltage compensation circuit provides a common voltage to the display screen to ensure its normal operation. Since the voltage compensation circuit has been described in detail above, it will not be repeated here.

[0035] This application also provides a voltage compensation method applied in a display device. The display device includes a display screen, a power management chip, and a voltage compensation circuit. The voltage compensation circuit includes a controller and a voltage compensation module. Specific details of the display device have been described above and will not be repeated here. Please refer to... Figure 4 , Figure 4 This is a schematic flowchart of the voltage compensation method provided in this embodiment. The specific flow of the voltage compensation method in this embodiment is as follows:

[0036] 101. Control the controller to receive pixel data, and when the load state of the display screen corresponding to the pixel data is the target load state, control the controller to output a first control signal, and when the load state of the display screen corresponding to the pixel data is a non-target load state, control the controller to output a second control signal.

[0037] 102. The control voltage compensation module outputs the first common voltage output by the power management chip to the display screen according to the first control signal, or compensates the first common voltage output by the power management chip according to the second control signal and outputs the second common voltage to the display screen.

[0038] After receiving pixel data, the controller detects the load status of the corresponding display screen. When the load status is the target load status, the controller outputs a first control signal; when the load status is not the target load status, the controller outputs a second control signal. Then, the voltage compensation module outputs a first common voltage to the display screen based on the first control signal, or compensates the first common voltage based on the second control signal before outputting it to the display screen. This effectively avoids the voltage compensation circuit overheating and malfunctioning when performing compensation under heavy load conditions.

[0039] Please see Figure 5 , Figure 5 This is a flowchart illustrating step 102 in the voltage compensation method provided in this embodiment. In some embodiments, the voltage compensation module in this embodiment includes a first branch, an output terminal, and a second branch. The specific details of the voltage compensation module have been described above and will not be repeated here. The flow of step 102 in this embodiment is as follows:

[0040] 1021. When the controller outputs the first control signal, it controls the first branch to output the first common voltage to the display screen through the output terminal.

[0041] 1022. When the controller outputs the second control signal, it controls the second branch to compensate for the first common voltage and then output the second common voltage to the display screen.

[0042] When the controller outputs the first control signal, it controls the first branch to output the first common voltage to the display screen through the output terminal. At this time, the second branch does not work. When the controller outputs the second control signal, it controls the second branch to output the first common voltage to the display screen after compensation. At this time, the first branch does not work. In this way, the compensation of the common voltage is completed according to the load status of the display screen, so as to avoid the voltage compensation circuit from overheating and malfunctioning under heavy load.

[0043] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0044] The voltage compensation circuit provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A voltage compensation circuit, characterized in that, Applied in a display device, the display device includes a power management chip, and the voltage compensation circuit includes: A controller is configured to receive pixel data and output a first control signal when the load state of the display screen corresponding to the pixel data is a target load state, and output a second control signal when the load state of the display screen corresponding to the pixel data is a non-target load state; wherein, the target load state is a heavy load state; A voltage compensation module is connected to the power management chip and the controller. The voltage compensation module is used to control the power management chip to output a first common voltage according to the first control signal, or to compensate the first common voltage output by the power management chip and output a second common voltage according to the second control signal. The voltage compensation module includes a first branch and an output terminal. The first branch is connected to the controller, the power management chip and the output terminal respectively. The first branch is used to output the first common voltage through the output terminal according to the first control signal. The voltage compensation module further includes a second branch, which is connected to the controller, the power management chip and the output terminal respectively. The second branch is used to compensate the first common voltage to the second common voltage according to the second control signal and then output it through the output terminal. The first branch includes a first switching transistor, a first end of which is connected to the controller, a second end of which is connected to the power management chip, and a third end of which is connected to the output terminal. The second branch includes a second switching transistor and an operational amplifier. The first terminal of the second switching transistor is connected to the controller, the second terminal of the second switching transistor is energized, the third terminal of the second switching transistor is connected to the power supply terminal of the operational amplifier, the non-inverting input terminal of the operational amplifier is connected to the power management chip, and the output terminal of the operational amplifier is connected to the output terminal.

2. The voltage compensation circuit according to claim 1, characterized in that, The first switch is turned on according to the first control signal, and the second switch is turned off according to the first control signal; the first switch is turned off according to the second control signal, and the second switch is turned on according to the second control signal.

3. A driving device, characterized in that, The driving device includes: Power management chip; The voltage compensation circuit as described in claim 1 or 2, wherein the voltage compensation circuit is connected to the power management chip.

4. A display device, characterized in that, The display device includes: Display screen; The driving device as described in claim 3, wherein the voltage compensation circuit in the driving device is connected to the display screen.

5. A voltage compensation method, characterized in that, The voltage compensation method is applied in a display device, which includes a display screen, a power management chip, and a voltage compensation circuit. The voltage compensation circuit includes a controller and a voltage compensation module. The voltage compensation method includes: The controller is controlled to receive pixel data, and when the load state of the display screen corresponding to the pixel data is the target load state, the controller is controlled to output a first control signal, and when the load state of the display screen corresponding to the pixel data is a non-target load state, the controller is controlled to output a second control signal; wherein, the target load state is a heavy load state; The voltage compensation module is controlled to output a first common voltage to the display screen according to the first control signal, or to compensate the first common voltage output by the power management chip and output a second common voltage to the display screen according to the second control signal; The voltage compensation module includes a first branch, an output terminal, and a second branch. The first branch is connected to the controller, the power management chip, and the output terminal, respectively. The second branch is also connected to the controller, the power management chip, and the output terminal. The first branch includes a first switching transistor, with its first terminal connected to the controller, its second terminal connected to the power management chip, and its third terminal connected to the output terminal. The second branch includes a second switching transistor and an operational amplifier. The first terminal of the second switching transistor is connected to the controller, its second terminal is energized, and its third terminal is connected to the power supply terminal of the operational amplifier. The non-inverting input terminal of the operational amplifier is connected to the power management chip, and the output terminal of the operational amplifier is connected to the output terminal. Controlling the voltage compensation module to output a first common voltage according to the first control signal, or to compensate the first common voltage according to the second control signal and then output a second common voltage, includes: When the controller outputs the first control signal, it controls the first branch to output the first common voltage to the display screen through the output terminal. The second switch in the second branch is turned off to cut off the power of the operational amplifier and disconnect the second branch to avoid the voltage compensation circuit from overheating due to compensation processing when the display screen is under heavy load. When the controller outputs the second control signal, it controls the second branch to compensate the first common voltage to the second common voltage and output it to the display screen. The first switch of the first branch is turned off to disconnect the output of the first branch.

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