WO2024093382A1 - 电压补偿电路、源驱动电路、显示器及电压补偿方法 - Google Patents

电压补偿电路、源驱动电路、显示器及电压补偿方法 Download PDF

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Publication number
WO2024093382A1
WO2024093382A1 PCT/CN2023/108887 CN2023108887W WO2024093382A1 WO 2024093382 A1 WO2024093382 A1 WO 2024093382A1 CN 2023108887 W CN2023108887 W CN 2023108887W WO 2024093382 A1 WO2024093382 A1 WO 2024093382A1
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Prior art keywords
voltage
gamma
circuit
gamma voltage
target
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PCT/CN2023/108887
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English (en)
French (fr)
Inventor
姚钦仁
洪炜翔
李权哲
李蓓
王胜超
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华为技术有限公司
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Publication of WO2024093382A1 publication Critical patent/WO2024093382A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element

Definitions

  • the present application relates to the field of display technology, and in particular to a voltage compensation circuit, a source driving circuit, a display, and a voltage compensation method.
  • OLED display is one of the hot topics in the field of flat panel display research today. Compared with Liquid Crystal Display (LCD), OLED display has the advantages of low energy consumption, low production cost, self-luminescence, wide viewing angle and fast response speed. At present, OLED display has begun to replace traditional LCD in the field of flat panel display such as mobile phones, PDAs and digital cameras.
  • LCD Liquid Crystal Display
  • the OLED is driven by a pixel circuit to emit light.
  • Figure 1 is a simplified circuit diagram of a pixel circuit driving an OLED to emit light.
  • the brightness of a pixel in an OLED display is determined by the current I flowing through the OLED, and the magnitude of the current I mainly depends on the magnitude of the gate-source voltage VGS of the driving transistor TFT.
  • VGS Vdata-VDD
  • Vdata represents the voltage value on the data line Data
  • VDD represents the voltage value on the power line ELVDD.
  • FIG. 2 is a schematic diagram of the structure of an OLED display.
  • the OLED display includes an OLED display screen 01 and a control circuit 02.
  • the OLED display screen 01 is provided with pixels arranged in a matrix (not shown in FIG. 2 ), a plurality of data lines Data, and a plurality of power lines ELVDD, and each pixel includes an OLED and a pixel circuit.
  • the control circuit 02 mainly includes a source driver circuit (Source Driver IC) 021, a power management integrated circuit (Power Management IC, PMIC) 022, a clock controller 023, a processor 024, an ELPMIC025, and the like.
  • the source driver circuit 021 is used to provide a voltage to the data line Data
  • the PMIC022 is used to provide a voltage to the source driver circuit 021
  • the ELPMIC025 is used to provide a voltage to the power line ELVDD.
  • the power line ELVDD between the ELPMIC025 and the OLED display screen 01 is long. Therefore, the voltage drop (IR Drop) on the power line ELVDD will make the VDD reaching the OLED display 01 lower than the voltage output by ELPMIC025, resulting in a dim overall brightness of the screen.
  • the present application provides a voltage compensation circuit, a source driving circuit, a display and a voltage compensation method, which can compensate for IR Drop on the power line, thereby improving the screen brightness.
  • an embodiment of the present application provides a voltage compensation circuit, which can be applied to a display.
  • the display includes an OLED display and a Gamma circuit.
  • the OLED display is provided with pixels arranged in a matrix, a plurality of data lines and a plurality of power lines, and each pixel includes an OLED and a pixel circuit.
  • the Gamma circuit is integrated in a source drive circuit, and the source drive circuit is used to provide a voltage to the data line.
  • the voltage compensation circuit is connected to the power line and the Gamma circuit at the end of the OLED display.
  • the voltage compensation circuit is used to collect the first power supply voltage on the power line at the end of the OLED display screen during the black insertion stage after the OLED display screen is turned on, and obtain a reference voltage based on the first power supply voltage; then collect the second power supply voltage on the power line when displaying each frame, and adjust the pre-stored initial maximum gamma voltage and initial minimum gamma voltage based on the difference between the reference voltage and the currently obtained second power supply voltage to obtain the target maximum gamma voltage and target minimum gamma voltage; finally, provide the obtained target maximum gamma voltage and target minimum gamma voltage to the Gamma circuit, so that the Gamma circuit adjusts the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage, thereby adjusting Vdata in real time, and then compensates for the IR Drop on the power line by adjusting Vdata to improve the screen brightness.
  • a driving circuit is generally also provided in the source driving circuit.
  • the gamma circuit adjusts the gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage to generate a grayscale voltage corresponding to the image data. Then the driving circuit can provide the grayscale voltage to the data line of the OLED display screen to realize the picture display.
  • the voltage compensation circuit in the present application may be integrated into the source driving circuit, and of course may also be independently provided with the source driving circuit, which is not limited here.
  • the voltage compensation circuit may include: a sampling circuit and a processing circuit.
  • the sampling circuit is used to collect the first power supply voltage on the power line at the end of the OLED display screen at least once during the black insertion phase after the OLED display screen is turned on, and convert each collected first power supply voltage into a first digital signal and send it to the processing circuit; collect the second power supply voltage on the power line at least once when displaying each frame of the picture, and convert each collected second power supply voltage into a second digital signal and send it to the processing circuit.
  • the sampling circuit can be an analog digital converter (ADC) circuit, and the accuracy of the ADC circuit is configured according to the compensation accuracy that needs to be met. For example, if the compensation accuracy that needs to be met is 8 bits, the accuracy of the ADC circuit can be configured to 8-bit accuracy.
  • ADC analog digital converter
  • the processing circuit is used to receive each first digital signal sent by the sampling circuit in the black insertion stage, and obtain and store a reference voltage based on at least one first digital signal received; when displaying each frame of the picture, receive each second digital signal sent by the sampling circuit, and adjust the pre-stored initial maximum gamma voltage and initial minimum gamma voltage according to the difference between the currently obtained second digital signal and the stored reference voltage to obtain a target maximum gamma voltage and a target minimum gamma voltage, and provide the obtained target maximum gamma voltage and target minimum gamma voltage to the Gamma circuit in the OLED display screen, so that the Gamma circuit adjusts the Gamma curve according to the currently obtained target maximum gamma voltage and target minimum gamma voltage.
  • the processing circuit can be a digital signal processor (DSP).
  • DSP digital signal processor
  • the target maximum gamma voltage and the target minimum gamma voltage are digital signals, which are applicable to the case where the gamma circuit is a PGamma circuit.
  • the two DAC circuits inside the PGamma circuit can convert the target maximum gamma voltage and the target minimum gamma voltage into two analog signals respectively, so that the PGamma circuit can adjust the gamma curve according to the two analog signals to generate a grayscale voltage corresponding to the image data.
  • the processing circuit may obtain a reference voltage based on one first digital signal, or may obtain a reference voltage based on multiple first digital signals, which is not limited here.
  • the reference voltage may be obtained according to a plurality of first digital signals.
  • the processing circuit may calculate the reference voltage according to an average value of a plurality of received first digital signals.
  • VGSP(1) represents the target minimum gamma voltage
  • VGMP(1) represents the target maximum gamma voltage
  • VGSP(0) represents the initial minimum gamma voltage
  • VGMP(1) represents the initial maximum gamma voltage
  • V2 represents the second digital signal
  • Vref represents the reference voltage
  • the present application does not limit the size of the threshold, and the threshold may be 0, or may be greater than 0, and may be specifically designed according to the actual product.
  • the target maximum gamma voltage is equal to the target maximum gamma voltage
  • the target minimum gamma voltage is equal to the initial minimum gamma voltage
  • the voltage compensation circuit provided in the embodiment of the present application can indirectly compensate for the IR Drop on the power line by compensating the minimum gamma voltage and the maximum gamma voltage.
  • the implementation of the embodiment of the present application only requires the introduction of an ADC and a DSP based on the original source drive circuit, which is relatively low in cost and does not require the area of the display screen.
  • fast and high-precision ELVDD compensation can be achieved by using a high-precision ADC.
  • the present application also provides a voltage compensation method, which may include the following steps: first, in the black insertion stage after the OLED display screen is turned on, the first power supply voltage on the power line at the end of the OLED display screen is collected, and a reference voltage is obtained based on the first power supply voltage. Then, when displaying each frame of the picture, the second power supply voltage on the power line is collected, and the pre-stored initial maximum gamma voltage and the initial minimum gamma voltage are adjusted according to the difference between the reference voltage and the currently acquired second power supply voltage to obtain the target maximum gamma voltage and the target minimum gamma voltage. Finally, the obtained target maximum gamma voltage and target minimum gamma voltage are provided to the Gamma circuit, so that the Gamma circuit adjusts the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage.
  • the first power supply voltage on the power line at the end of the OLED display screen is collected at least once during the black insertion phase after the OLED display screen is turned on, and each collected first power supply voltage is converted into a first digital signal, and a reference voltage is obtained and stored according to at least one first digital signal.
  • the second power supply voltage on the power line is collected at least once when each frame is displayed, and each collected second power supply voltage is converted into a second digital signal, and the pre-stored initial maximum gamma voltage and initial minimum gamma voltage are adjusted according to the difference between the currently obtained second digital signal and the stored reference voltage to obtain a target maximum gamma voltage and a target minimum gamma voltage.
  • the reference voltage may be calculated according to an average value of a plurality of first digital signals.
  • the target maximum gamma voltage is equal to the target maximum gamma voltage
  • the target minimum gamma voltage is equal to the initial minimum gamma voltage
  • the present application further provides a source driving circuit, comprising a voltage compensation circuit provided by the first aspect or any one of the embodiments of the first aspect and a Gamma circuit connected to the voltage compensation circuit.
  • a source driving circuit comprising a voltage compensation circuit provided by the first aspect or any one of the embodiments of the first aspect and a Gamma circuit connected to the voltage compensation circuit.
  • the Gamma circuit can adjust the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage, and adjust Vdata in real time, so as to compensate for the IR Drop on the power line by adjusting Vdata, thereby improving the screen display brightness.
  • the source driving circuit also includes a driving circuit, and the gamma circuit adjusts the gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage to generate a grayscale voltage corresponding to the image data.
  • the driving circuit can then provide the grayscale voltage to the data line of the OLED display screen to achieve picture display.
  • the present application further provides a display, comprising an OLED display and a source drive circuit provided in the third aspect, the source drive circuit being used to drive the OLED display.
  • the display may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, a navigator, etc.
  • the implementation of the display may refer to the embodiment of the source drive circuit described above, and the repetitive parts will not be repeated.
  • FIG1 is a simplified circuit diagram of a pixel circuit provided in an embodiment of the present application driving an OLED to emit light;
  • FIG2 is a schematic diagram of the structure of an OLED display provided in an embodiment of the present application.
  • FIG3 is a schematic diagram of the structure of a terminal provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of a set of set Gamma curves exemplarily shown in the present application.
  • FIG5 is a schematic diagram of a structure of a voltage compensation circuit provided in an embodiment of the present application applied to a display;
  • FIG6 is a schematic diagram of a flow chart of a voltage compensation method provided in an embodiment of the present application.
  • FIG7 is a schematic diagram of the structure of a voltage compensation circuit provided by an embodiment of the present application.
  • FIG8 is a timing diagram corresponding to a display provided by an embodiment of the present application.
  • FIG9 is a schematic diagram of the structure of a voltage compensation circuit provided by another embodiment of the present application.
  • FIG10 is a schematic diagram of a flow chart of the voltage compensation circuit shown in FIG9 when performing voltage compensation
  • FIG. 11 is a schematic diagram of the structure of a source driving circuit provided in an embodiment of the present application.
  • 01-OLED display 01-OLED display; 02-control circuit; 03-housing; 021-source drive circuit; 022-PMIC; 023-clock controller; 024-processor; 025-ELPMIC; 001-Gamma circuit; 002-drive circuit; 003-voltage compensation circuit; 0031-sampling circuit; 0032-processing circuit; TFT-drive transistor; Data-data line; ELVDD-power line.
  • connection refers to electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components.
  • a and B are connected, which can be either A and B directly connected, or A and B are indirectly connected through one or more other electrical components.
  • a and B are connected, or A and C are directly connected, C and B are directly connected, and A and B is connected through C.
  • the compensation circuit can be applied to a terminal, which includes, for example, a watch, a mobile phone, a tablet computer, a personal digital assistant (PDA), a car computer, a monitor, and a television (TV).
  • a terminal which includes, for example, a watch, a mobile phone, a tablet computer, a personal digital assistant (PDA), a car computer, a monitor, and a television (TV).
  • PDA personal digital assistant
  • TV television
  • the embodiment of the present application does not impose any special restrictions on the specific form of the above-mentioned terminal.
  • the terminal mainly includes an OLED display screen 01, a control circuit (not shown in Figure 3) and a housing 03.
  • the OLED display screen 01 and the control circuit can be arranged in the housing 03.
  • the OLED display screen 01 is provided with pixels arranged in a matrix (not shown in FIG. 2 ), a plurality of data lines Data and a plurality of power lines ELVDD, and each pixel includes an OLED and a pixel circuit.
  • the control circuit 02 mainly includes a source drive circuit 021 and a PMIC022, a clock controller 023, a processor 024, an ELPMIC025, etc.
  • the source drive circuit 021 is used to provide a voltage to the data line Data
  • the PMIC022 is used to provide a voltage to the source drive circuit 021
  • the ELPMIC025 is used to provide a voltage to the power line ELVDD.
  • the power line ELVDD between the ELPMIC025 and the OLED display screen 01 is long. Therefore, the voltage drop on the power line ELVDD will make the VDD reaching the OLED display screen 01 lower than the output of the ELPMIC025, resulting in a dim overall brightness of the screen.
  • the present application proposes a voltage compensation circuit, a driving circuit, a display and a voltage compensation method, which can compensate for the voltage drop on ELVDD.
  • a voltage compensation circuit for ease of understanding, the gamma curve is first introduced.
  • the Gamma curve is an important parameter that characterizes the response characteristics of the optical brightness of the OLED display to the electrical signal.
  • the display brightness of the display can be adjusted by adjusting the Gamma curve.
  • the Gamma curve can represent the corresponding relationship between the voltage value and the grayscale value of each node, and can also represent the corresponding relationship between the storage value in the register of the OLED display and the grayscale value. Therefore, the voltage value corresponding to the grayscale value of each node in the Gamma curve corresponds to the storage value in the register of the OLED module.
  • FIG4 is a schematic diagram of the relationship between various parameters corresponding to the Gamma curve of an OLED display provided by an embodiment of the present application.
  • a set of set Gamma curves is exemplarily shown
  • the horizontal axis in FIG4 represents the node grayscale value Gray
  • the number of bits of the grayscale value Gray is exemplarily set to 8 bits, that is, there are 256 grayscale values in the Gamma orientation, that is, 0 to 255 grayscale values
  • the left vertical axis represents the storage value D in the register
  • the storage value D can represent the initial value of the grayscale value to be adjusted stored in the register, that is, the image data
  • the storage value D is exemplarily represented by 10-bit binary here
  • the value range of the storage value D is 0-1024
  • the right vertical axis represents the grayscale voltage value Vdata (that is, the voltage value corresponding to different grayscale values, that is, the voltage value on the data line Data when displayed), and the value range of the grayscale voltage value Vdata is
  • VGSP represents the low voltage of the Gamma circuit, which may correspond to the lowest grayscale voltage, such as the voltage value corresponding to the grayscale value of 0.
  • VGMP represents the high voltage of the Gamma circuit, which may correspond to the highest grayscale voltage, such as the voltage value corresponding to the grayscale value of 255.
  • Gray in the Gamma curve there is a grayscale voltage value Vdata and a storage value D of the register corresponding to it, that is, each node voltage value in the grayscale voltage value Vdata corresponds to each node storage value of the storage value D.
  • the grayscale voltage value Vdata has a value range of VGSP-VGMP and the storage value D has a value range of 0-1024.
  • the Gamma circuit can determine the grayscale voltage value Vdata corresponding to each node storage value D (0-1024) in the register according to VGSP-VGMP, thereby converting the image data into a grayscale voltage. This process is called Gamma adjustment.
  • the digital Gamma (PGamma) circuit has become the mainstream implementation solution for the Gamma circuit.
  • the VGMP and VGSP of the PGamma circuit are generated by the two digital signals input to the PGamma circuit and the two digital-to-analog converter (DAC) circuits inside the PGamma circuit.
  • DAC digital-to-analog converter
  • FIG. 5 is a schematic diagram of the structure of a voltage compensation circuit 003 provided in an embodiment of the present application.
  • the voltage compensation circuit 003 is applied to a display, and the display includes an OLED display screen 01, a Gamma circuit 001 and an ELPMIC025.
  • the OLED display screen 01 is provided with pixels arranged in a matrix (not shown in Figure 5), a plurality of data lines Data and a plurality of power lines ELVDD, and each pixel includes an OLED and a pixel circuit.
  • the Gamma circuit 001 is integrated in the source driving circuit 021, and the source driving circuit 021 is used to provide a voltage to the data line Data, and the ELPMIC025 is used to provide a voltage to the power line ELVDD.
  • the voltage compensation circuit 003 is connected to the power line ELVDD and the Gamma circuit 001 at the end of the OLED display screen 01.
  • the voltage compensation circuit 003 can perform voltage compensation by the following method, as shown in Figure 6, and the method may include the following steps:
  • Step S101 collecting a first power supply voltage on a power supply line ELVDD at a terminal of the OLED display screen 01 during a black insertion phase after the OLED display screen 01 is turned on, and obtaining a reference voltage according to the first power supply voltage.
  • the OLED display screen 01 when the OLED display screen 01 is powered on, there will be a black insertion stage before each frame of the picture is displayed normally. During the black insertion stage, the OLED display screen 01 will display a black insertion picture. It can be considered that almost no current is supplied to the OELD in this stage, so the reference voltage is obtained according to the first power supply voltage on the power line ELVDD at the OLED display screen 01 end.
  • Step S102 acquiring the second power voltage on the power line ELVDD when displaying each frame, and adjusting the pre-stored initial maximum gamma voltage and initial minimum gamma voltage according to the difference between the reference voltage and the currently acquired second power voltage to obtain the target maximum gamma voltage and the target minimum gamma voltage.
  • Step S103 providing the obtained target maximum gamma voltage and target minimum gamma voltage to the Gamma circuit 001 , so that the Gamma circuit 001 adjusts the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage.
  • a driving circuit 002 is generally also provided in the source driving circuit 021.
  • the Gamma circuit 001 adjusts the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage, and can generate a grayscale voltage corresponding to the image data. Then, the driving circuit 002 can provide the grayscale voltage to the data line of the OLED display screen 01, thereby realizing picture display.
  • the embodiment of the present application provides a voltage compensation circuit 003, which can adjust the pre-stored initial maximum gamma voltage and the initial minimum gamma voltage according to the difference between the second power voltage and the reference voltage on the power line ELVDD when displaying each frame of the picture, so as to obtain the target maximum gamma voltage and the target minimum gamma voltage, and then provide the obtained target maximum gamma voltage and the target minimum gamma voltage to the Gamma circuit 001, so that the Gamma circuit 001 can adjust the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage, so as to adjust Vdata in real time, and then compensate for the IR Drop on ELVDD by adjusting Vdata, thereby improving the screen brightness.
  • the voltage compensation circuit 003 in the present application may be integrated into the source driving circuit 021 , and of course may also be independently provided with the source driving circuit 021 , which is not limited here.
  • the voltage compensation circuit 003 may include: a sampling circuit 0031 and a processing circuit 0032 .
  • the sampling circuit 0031 is used to collect the first power supply voltage on the power line ELVDD at the end of the OLED display screen 01 at least once during the black insertion phase after the OLED display screen 01 is turned on, and convert the collected first power supply voltage each time into a first digital signal and send it to the processing circuit 0032; collect the second power supply voltage on the power line ELVDD at least once when displaying each frame of the picture, and convert the collected second power supply voltage each time into a second digital signal and send it to the processing circuit 0032.
  • the sampling circuit 0031 can be an analog digital converter (ADC) circuit, and the accuracy of the ADC circuit is configured according to the compensation accuracy that needs to be met. For example, if the compensation accuracy that needs to be met is 8 bits, the accuracy of the ADC circuit can be configured to 8-bit accuracy.
  • ADC analog digital converter
  • the processing circuit 0032 is used to receive each first digital signal sent by the sampling circuit 0031 during the black insertion stage, and obtain a reference voltage and store the reference voltage based on at least one first digital signal received; when displaying each frame of the picture, it receives each second digital signal sent by the sampling circuit 0031, and adjusts the pre-stored initial maximum gamma voltage and the initial minimum gamma voltage according to the difference between the currently obtained second digital signal and the stored reference voltage to obtain the target maximum gamma voltage and the target minimum gamma voltage, and provides the obtained target maximum gamma voltage and the target minimum gamma voltage to the Gamma circuit 001 in the OLED display screen 01, so that the Gamma circuit 001 adjusts the Gamma curve according to the currently obtained target maximum gamma voltage and the target minimum gamma voltage.
  • the processing circuit 0032 can be a digital signal processor (DSP).
  • DSP digital signal processor
  • the obtained target maximum gamma voltage and target minimum gamma voltage are digital signals, which are applicable to the case where the gamma circuit 001 is a PGamma circuit 001.
  • the two DAC circuits inside the PGamma circuit 001 can convert the target maximum gamma voltage and the target minimum gamma voltage into two analog signals respectively, so that the PGamma circuit 001 can perform gamma curve adjustment according to the two analog signals to generate grayscale voltages corresponding to the image data.
  • the processing circuit 0032 may obtain a reference voltage according to one first digital signal, or may obtain a reference voltage according to multiple first digital signals, which is not limited here.
  • the reference voltage may be obtained according to a plurality of first digital signals.
  • the processing circuit 0032 may calculate the reference voltage according to an average value of a plurality of received first digital signals.
  • VGSP(1) represents the target minimum gamma voltage
  • VGMP(1) represents the target maximum gamma voltage
  • VGSP(0) represents the initial minimum gamma voltage
  • VGMP(1) represents the initial maximum gamma voltage
  • V2 represents the second digital signal
  • Vref represents the reference voltage
  • the present application does not limit the size of the threshold, and the threshold may be 0, or may be greater than 0, and may be specifically designed according to the actual product.
  • the target maximum gamma voltage is equal to the target maximum gamma voltage
  • the target minimum gamma voltage is equal to the initial minimum gamma voltage
  • the embodiment of the present application further provides a voltage compensation method, as shown in FIG6 , the voltage compensation method may include the following steps:
  • Step S101 collecting a first power supply voltage on a power supply line ELVDD at a terminal of the OLED display screen 01 during a black insertion phase after the OLED display screen 01 is turned on, and obtaining a reference voltage according to the first power supply voltage.
  • the first power supply voltage on the power line ELVDD at the OLED display screen 01 end is collected at least once, and each collected first power supply voltage is converted into a first digital signal, and a reference voltage is obtained and stored based on at least one first digital signal.
  • the reference voltage may be calculated according to an average value of a plurality of first digital signals.
  • Step S102 acquiring the second power voltage on the power line ELVDD when displaying each frame, and adjusting the pre-stored initial maximum gamma voltage and initial minimum gamma voltage according to the difference between the reference voltage and the currently acquired second power voltage to obtain the target maximum gamma voltage and the target minimum gamma voltage.
  • the second power supply voltage on the power line ELVDD is sampled at least once when displaying each frame, and each sampled second power supply voltage is converted into a second digital signal.
  • the pre-stored initial maximum gamma voltage and the initial minimum gamma voltage are adjusted according to the difference between the currently acquired second digital signal and the stored reference voltage to obtain the target maximum gamma voltage and the target minimum gamma voltage.
  • the target maximum gamma voltage is equal to the target maximum gamma voltage
  • the target minimum gamma voltage is equal to the initial minimum gamma voltage
  • Step S103 providing the obtained target maximum gamma voltage and target minimum gamma voltage to the Gamma circuit 001 , so that the Gamma circuit 001 adjusts the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage.
  • the voltage compensation circuit 003 and the voltage compensation method provided in the embodiment of the present application are described below in conjunction with specific embodiments. It should be noted that the embodiments are for better explaining the present application, but do not limit the present application.
  • FIG 8 is a timing diagram corresponding to the display provided by an embodiment of the present application.
  • the EN-AVC signal is an enable control signal for voltage compensation.
  • a high level of EN-AVC indicates that voltage compensation is required, and a low level of EN-AVC indicates that voltage compensation is not required.
  • the Mute signal is at a high level, it indicates the black insertion stage, and when the Mute signal is at a low level, it indicates the normal picture display stage.
  • Figure 9 is a structural schematic diagram of a voltage compensation circuit 003 provided by an embodiment of the present application. The implementation of the present application is divided into two stages: sampling ELVDD when there is no IR Drop and a normal compensation stage.
  • the ADC circuit samples the voltage on the power line ELVDD at the end of the OLED display screen 01, and converts the collected voltage into a digital signal and sends it to the DSP for processing.
  • FIG10 is a flow chart of the voltage compensation circuit 003 shown in FIG9 when performing voltage compensation.
  • the DSP determines whether the difference between the currently acquired second digital signal and the stored reference voltage is greater than the threshold value; if the difference between the currently acquired second digital signal and the stored reference voltage is greater than the threshold value, the initial maximum gamma voltage and the initial minimum gamma voltage are adjusted according to the difference to obtain the target maximum gamma voltage and the target minimum gamma voltage. If the difference between the currently acquired second digital signal and the stored reference voltage is less than or equal to the threshold value, the target maximum gamma voltage is equal to the target maximum gamma voltage, and the target minimum gamma voltage is equal to the initial minimum gamma voltage.
  • the DSP provides the obtained target maximum gamma voltage and target minimum gamma voltage to the PGamma circuit 001; the two DAC circuits inside the PGamma circuit 001 can convert the target maximum gamma voltage and the target minimum gamma voltage into two analog signals respectively, so that the PGamma circuit 001 can adjust the gamma curve according to the two analog signals to generate the grayscale voltage corresponding to the image data.
  • the voltage compensation circuit 003 provided in the embodiment of the present application can indirectly compensate for the IR Drop on the power line ELVDD by compensating the minimum gamma voltage and the maximum gamma voltage.
  • the implementation of the embodiment of the present application only requires the introduction of an ADC and a DSP based on the original source driving circuit 021, which is relatively low in cost and does not require the area of the display screen.
  • by using a high-precision ADC fast High-precision ELVDD compensation.
  • the present application further provides a source driving circuit 021, comprising any of the above-mentioned voltage compensation circuits 003 provided in the embodiments of the present application and a Gamma circuit 001 connected to the voltage compensation circuit 003.
  • a source driving circuit 021 comprising any of the above-mentioned voltage compensation circuits 003 provided in the embodiments of the present application and a Gamma circuit 001 connected to the voltage compensation circuit 003.
  • the pre-stored initial maximum gamma voltage and the initial minimum gamma voltage can be adjusted according to the difference between the second power supply voltage and the reference voltage on the power line ELVDD to obtain the target maximum gamma voltage and the target minimum gamma voltage, and then the obtained target maximum gamma voltage and the target minimum gamma voltage are provided to the Gamma circuit 001.
  • the Gamma circuit 001 can adjust the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage, and adjust Vdata in real time, so as to compensate for the IR Drop on the power line ELVDD by adjusting Vdata, thereby improving the screen display brightness.
  • the source driving circuit 021 also includes a driving circuit 002.
  • the Gamma circuit 001 adjusts the Gamma curve according to the target maximum gamma voltage and the target minimum gamma voltage to generate a grayscale voltage corresponding to the image data.
  • the driving circuit 002 can then provide the grayscale voltage to the data line of the OLED display screen 01 to achieve picture display.
  • the present application also provides a display, including an OLED display screen 01 and a source driving circuit 021 provided in an embodiment of the present application, wherein the source driving circuit 021 is used to drive the OLED display screen 01.
  • the structure of the display can be shown in FIG5.
  • the display can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, a navigator, etc.
  • the implementation of the display can refer to the embodiment of the source driving circuit 021 above, and the repeated parts will not be repeated.

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Abstract

一种电压补偿电路（003）、源驱动电路（021）、显示器及电压补偿方法，电压补偿电路（003）应用于显示器中，电压补偿电路（003）在OLED显示屏（01）开启后的插黑阶段采集OLED显示屏（01）端处的电源线（ELVDD）上的第一电源电压，并根据第一电源电压获得参考电压（S101）；然后在显示每一帧画面时采集电源线（ELVDD）上的第二电源电压，并根据参考电压与当前获取的第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压（S102）；最后将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路（001），以使Gamma电路（001）根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节（S103），从而实时对Vdata进行调节，进而通过调节Vdata来补偿电源线（ELVDD）上的IR Drop，提升屏幕亮度。

Description

电压补偿电路、源驱动电路、显示器及电压补偿方法
相关申请的交叉引用
本申请要求在2022年11月03日提交中国专利局、申请号为202211368112.3、申请名称为“电压补偿电路、源驱动电路、显示器及电压补偿方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示技术领域，尤其涉及一种电压补偿电路、源驱动电路、显示器及电压补偿方法。
背景技术
有机发光二极管(Organic Light Emitting Diode，OLED)显示器是当今平板显示器研究领域的热点之一，与液晶显示器(Liquid Crystal Display，LCD)相比，OLED显示器具有低能耗、生产成本低、自发光、宽视角及响应速度快等优点，目前，在手机、PDA、数码相机等平板显示领域，OLED显示器已经开始取代传统的LCD。
在OLED显示器中，OLED由像素电路驱动发光。参考图1，图1为像素电路驱动OLED发光时的简化电路示意图。显示时，OLED显示器中像素的亮度由流过OLED的电流I决定，而电流I的大小主要取决于驱动晶体管TFT的栅源跨压VGS的大小，VGS越小，流过驱动晶体管TFT的电流I越大，像素越亮。其中，VGS＝Vdata-VDD，Vdata表示数据线Data上的电压值，VDD表示电源线ELVDD上的电压值。
参考图2，图2为OLED显示器的结构示意图。OLED显示器包括OLED显示屏01和控制电路02。OLED显示屏01上设置有矩阵排列的像素(图2中未示出)、多条数据线Data和多条电源线ELVDD，每个像素包括OLED和像素电路。控制电路02主要包括源驱动电路(Source Driver IC)021和电源管理集成电路(Power Management IC，PMIC)022、时钟控制器023、处理器024、ELPMIC025等。其中，源驱动电路021用于向数据线Data提供电压，PMIC022用于向源驱动电路021提供电压，ELPMIC025用于向电源线ELVDD提供电压。但是由于ELPMIC025距OLED显示屏01较远，ELPMIC025与OLED显示屏01之间的电源线ELVDD较长。因此电源线ELVDD上的压降(IR Drop)会使得到达OLED显示屏01上的VDD比ELPMIC025输出的电压更低，导致屏幕整体亮度偏暗。
发明内容
本申请提供一种电压补偿电路、源驱动电路、显示器及电压补偿方法，可以补偿电源线上的IR Drop，从而提升屏幕亮度。
第一方面，本申请实施例提供的一种电压补偿电路，该电压补偿电路可以应用于显示器中。其中，显示器中包括OLED显示屏和Gamma电路。OLED显示屏上设置有矩阵排列的像素、多条数据线和多条电源线，每个像素包括OLED和像素电路。Gamma电路集成在源驱动电路中，源驱动电路用于向数据线提供电压。该电压补偿电路与OLED显示屏端处的电源线和Gamma电路连接。该电压补偿电路用于在OLED显示屏开启后的插黑阶段采集该OLED显示屏端处的电源线上的第一电源电压，并根据该第一电源电压获得参考电压；然后在显示每一帧画面时采集该电源线上的第二电源电压，并根据该参考电压与当前获取的第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压；最后将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路，以使Gamma电路根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，从而实时对Vdata进行调节，进而通过调节Vdata来补偿电源线上的IR Drop，提升屏幕亮度。
在具体实施时，源驱动电路中一般还设置有驱动电路，Gamma电路根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，可以产生图像数据对应的灰阶电压，然后驱动电路可以将该灰阶电压通过提供给OLED显示屏的数据线，从而实现画面显示。
在具体实施时，本申请中的电压补偿电路可以集成在源驱动电路中，当然也可以与源驱动电路独立设置，在此不作限定。
在一种可能是实现方式中，该电压补偿电路可以包括：采样电路和处理电路。
采样电路用于在OLED显示屏开启后的插黑阶段至少采集一次OLED显示屏端处的电源线上的第一电源电压，并将每一次采集的第一电源电压转换为第一数字信号后发送给处理电路；在显示每一帧画面时至少采集一次电源线上的第二电源电压，并将每一次采集的第二电源电压转换为第二数字信号后发送给处理电路。
示例性的，采样电路可以是模数转换(Analog Digital Converter，ADC)电路，ADC电路的精度根据需要满足的补偿精度进行配置，例如需要满足的补偿精度为8bit，则ADC电路的精度可以配置为8-bit精度。
处理电路用于在插黑阶段接收采样电路发送的每一个第一数字信号，并根据接收的至少一个第一数字信号获得参考电压并存储参考电压；在显示每一帧画面时，接收采样电路发送的每一个第二数字信号，并根据当前获取的第二数字信号与存储的参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压，并将得到的目标最大伽马电压和目标最小伽马电压提供给OLED显示屏中的Gamma电路，以使Gamma电路根据当前获取的目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节。
示例性的，处理电路可以是数字信号处理器(Digital Signal Processing，DSP)。
在该实施例中，得到的目标最大伽马电压和目标最小伽马电压为数字信号，适用于Gamma电路为PGamma电路的情况。PGamma电路内部的两个DAC电路可以将目标最大伽马电压和目标最小伽马电压分别转换为两个模拟信号，从而PGamma电路可以根据该两个模拟信号进行Gamma曲线调节，生成图像数据对应的灰阶电压。
可选的，本申请中，处理电路可以根据1个第一数字信号获得参考电压，也可以根据多个第一数字信号获得参考电压，在此不作限定。
示例性的，为了提高参考电压的准确度，可以根据多个第一数字信号获得参考电压。
在一种可能实现方式中，处理电路可以根据接收的多个第一数字信号的平均值计算参考电压。
在一种示例中，处理电路可以先确定当前获取的该第二数字信号与存储的该参考电压的差值是否大于阈值；如果当前获取的该第二数字信号与存储的该参考电压的差值大于阈值，则根据该差值分别调节该初始最大伽马电压和初始最小伽马电压，得到该目标最大伽马电压和该目标最小伽马电压。例如VGSP(1)＝VGSP(0)-K*(V2-Vref)，VGMP(1)＝VMSP(0)-K*(V2-Vref)。其中，VGSP(1)表示目标最小伽马电压，VGMP(1)表示目标最大伽马电压，VGSP(0)表示初始最小伽马电压，VGMP(1)表示初始最大伽马电压，V2表示第二数字信号，Vref表示参考电压，K表示调节系数，可以是预先存储的，也可以是由其它电路输入给处理器的，在此不作限定。示例性的，K＝0.8～1.5。
本申请对该阈值的大小不作限定，该阈值可以为0，当然也可以大于0，具体可以根据实际产品进行设计。
进一步地，如果当前获取的该第二数字信号与存储的该参考电压的差值小于或等于该阈值，则该目标最大伽马电压等于该目标最大伽马电压，该目标最小伽马电压等于该初始最小伽马电压。
本申请实施例提供的电压补偿电路，可以通过补偿最小伽马电压和最大伽马电压间接补偿电源线上的IR Drop。并且本申请实施例的实现只需要在原有的源驱动电路的基础上引入一个ADC和DSP，成本比较低，且不需要占用显示屏的面积，并且通过使用高精度的ADC可以实现快速高精度的ELVDD补偿。
第二方面，本申请还提供了一种电压补偿方法，该电压补偿方法可以包括以下步骤：首先在OLED显示屏开启后的插黑阶段采集该OLED显示屏端处的电源线上的第一电源电压，并根据该第一电源电压获得参考电压。然后在显示每一帧画面时采集该电源线上的第二电源电压，并根据该参考电压与当前获取的第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。最后将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路，以使Gamma电路根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节。
在一种可能的设计中，在OLED显示屏开启后的插黑阶段至少采集一次OLED显示屏端处的电源线上的第一电源电压，并将每一次采集的第一电源电压转换为第一数字信号，根据至少一个第一数字信号获得参考电压并存储参考电压。在显示每一帧画面时至少采集一次电源线上的第二电源电压，并将每一次采集的第二电源电压转换为第二数字信号，根据当前获取的第二数字信号与存储的参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
可选的，可以根据多个第一数字信号的平均值计算参考电压。
在一种示例中，可以先确定当前获取的第二数字信号与存储的参考电压的差值是否大于阈值；如果当前获取的该第二数字信号与存储的该参考电压的差值大于阈值，则根据该差值分别调节初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
进一步地，如果当前获取的该第二数字信号与存储的该参考电压的差值小于或等于阈值，则目标最大伽马电压等于目标最大伽马电压，目标最小伽马电压等于初始最小伽马电压。
第三方面，本申请还提供了一种源驱动电路，包括上述第一方面或第一方面中任意一种实施方式所提供的电压补偿电路和与该电压补偿电路连接的Gamma电路。可以在显示每一帧画面时，根据电源线上的第二电源电压和参考电压差值对预存的初始最大伽马电压和初始最小伽马电压进行调节，得到目标最大伽马电压和目标最小伽马电压，然后将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路。Gamma电路可以根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，实时对Vdata进行调节，从而通过调节Vdata来补偿电源线上的IR Drop，提升屏幕显示亮度。
示例性的，源驱动电路中还包括驱动电路，Gamma电路根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，可以产生图像数据对应的灰阶电压，然后驱动电路可以将该灰阶电压通过提供给OLED显示屏的数据线，从而实现画面显示。
第四方面，本申请还提供了一种显示器，包括OLED显示屏和上述第三方面提供的源驱动电路，该源驱动电路用于驱动该OLED显示屏。该显示器可以为：手机、平板电脑、电视机、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。该显示器的实施可以参见上述源驱动电路的实施例，重复之处不再赘述。
第三方面和第四方面可以达到的技术效果可以参照上述第一方面中任一可能设计可以达到的技术效果说明，这里不再重复赘述。
附图说明
图1为本申请实施例提供的一种像素电路驱动OLED发光时的简化电路示意图；
图2为本申请实施例提供的一种OLED显示器的结构示意图；
图3为本申请实施例提供的一种终端的结构示意图；
图4为本申请示例性地示出的一组设定的Gamma曲线的示意图；
图5为本申请实施例提供的电压补偿电路应用于显示器的结构示意图；
图6为本申请实施例提供的一种电压补偿方法的流程示意图；
图7为本申请一种实施例提供的电压补偿电路的结构示意图；
图8为本申请一种实施例提供的显示器对应的时序图；
图9为本申请另一种实施例提供的电压补偿电路的结构示意图；
图10为图9所示的电压补偿电路在进行电压补偿时的流程示意图；
图11为本申请实施例提供的一种源驱动电路的结构示意图。
附图标记说明：
01-OLED显示屏；02-控制电路；03-壳体；021-源驱动电路；022-PMIC；023-时钟控制器；024-处理器；025-ELPMIC；001-Gamma电路；002-驱动电路；003-电压补偿电路；0031-采样电路；0032-处理电路；TFT-驱动晶体管；Data-数据线；ELVDD-电源线。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。方法实施例中的具体操作方法也可以应用于装置实施例或系统实施例中。需要说明的是，在本申请的描述中“至少一个”是指一个或多个，其中，多个是指两个或两个以上。有鉴于此，本申请实施例中也可以将“多个”理解为“至少两个”。另外，需要理解的是，在本申请的描述中，“第一”、“第二”等词汇，仅用于区分描述的目的，而不能理解为指示或暗示相对重要性，也不能理解为指示或暗示顺序。
需要指出的是，本申请实施例中“连接”指的是电连接，两个电学元件连接可以是两个电学元件之间的直接或间接连接。例如，A与B连接，既可以是A与B直接连接，也可以是A与B之间通过一个或多个其它电学元件间接连接，例如A与B连接，也可以是A与C直接连接，C与B直接连接，A与 B之间通过C实现了连接。
为了方便理解本申请实施例提供的补偿电路，首先说明一下其应用场景，该补偿电路可应用于终端，该终端包括例如手表、手机、平板电脑、个人数字助理(personal digital assistant，PDA)、车载电脑、显示器(monitor)和电视(television，TV)等。本申请实施例对上述终端的具体形式不做特殊限制。以下为了方便说明，以终端为手机为例进行的说明。如图3所示，所述终端主要包括OLED显示屏01、控制电路(图3中未示出)和壳体03，OLED显示屏01和控制电路可以设置于壳体03内。
参见图2，OLED显示屏01上设置有矩阵排列的像素(图2中未示出)、多条数据线Data和多条电源线ELVDD，每个像素包括OLED和像素电路。控制电路02主要包括源驱动电路021和PMIC022、时钟控制器023、处理器024、ELPMIC025等。其中，源驱动电路021用于向数据线Data提供电压，PMIC022用于向源驱动电路021提供电压，ELPMIC025用于向电源线ELVDD提供电压。但是由于ELPMIC025距OLED显示屏01较远，ELPMIC025与OLED显示屏01之间的电源线ELVDD较长。因此电源线ELVDD上的压降会使得到达OLED显示屏01上的VDD比ELPMIC025输出的更低，导致屏幕整体亮度偏暗。
有鉴于此，本申请提出一种电压补偿电路、驱动电路、显示器及电压补偿方法，可以补偿ELVDD上的压降。为了便于理解，首先介绍一下伽马(Gamma)曲线。
Gamma曲线是表征OLED显示屏的光学亮度对电信号响应特性的重要参数，通过调节Gamma曲线能够调节显示屏的显示亮度。Gamma曲线可以表示各节点灰阶值的电压值与灰阶值的对应关系，也可以表示OLED显示屏的寄存器中的存储值与灰阶值的对应关系。因此Gamma曲线中各节点灰阶值对应的电压值与OLED模组寄存器中的存储值一一对应。
图4为本申请实施例提供的一种OLED显示屏的Gamma曲线对应的各参数的关系示意图。如图4所示，示例性地示出了一组设定的Gamma曲线，图4中横坐标表示节点灰阶值Gray，这里示例性地设置灰阶值Gray的位数为8比特，即Gamma取向中共256个灰阶值即0～255灰阶值，左侧纵坐标表示寄存器中的存储值D，存储值D可以表示存储在寄存器中待调节灰阶值的初始值，也即图像数据，这里示例性地以10位二进制表示存储值D，存储值D的取值范围为0-1024，右侧纵坐标表示灰阶电压值Vdata(即不同灰阶值对应的电压值，也即显示时数据线Data上的电压值)，这里示例性地设置灰阶电压值Vdata的取值范围为VGSP-VGMP。VGSP表示Gamma电路的低电压，可对应于最低灰阶电压，例如0灰阶值对应的电压值，VGMP表示Gamma电路的高电压，可对应于最高灰阶电压，例如255灰阶值对应的电压值。具体的，如图4所示，对于Gamma曲线中的每一灰阶值Gray，均有一灰阶电压值Vdata以及寄存器的存储值D与之一一对应，即灰阶电压值Vdata中的各节点电压值与存储值D的各节点存储值一一对应，以灰阶电压值Vdata的取值范围为VGSP-VGMP，存储值D的取值范围为0-1024为例，Gamma电路可以根据VGSP-VGMP确定出寄存器中各节点存储值D(0-1024)对应的灰阶电压值Vdata，从而将图像数据转化为灰阶电压，该过程称为Gamma调节。为了使Source Driver IC的灵活性更高，数字Gamma(PGamma)电路成为了Gamma电路的主流实现方案。而PGamma电路的VGMP和VGSP由输入PGamma电路的两个数字信号和PGamma电路内部的两个数模转换(Digital Analog Converter，DAC)电路分别转换产生的。
下面将结合附图对本申请作进一步地详细描述。
参见图5，图5为本申请一种实施例提供的电压补偿电路003的结构示意图。该电压补偿电路003应用于显示器中，显示器包括OLED显示屏01、Gamma电路001和ELPMIC025。OLED显示屏01上设置有矩阵排列的像素(图5中未示出)、多条数据线Data和多条电源线ELVDD，每个像素包括OLED和像素电路。Gamma电路001集成在源驱动电路021中，源驱动电路021用于向数据线Data提供电压，ELPMIC025用于向电源线ELVDD提供电压。该电压补偿电路003与OLED显示屏01端处的电源线ELVDD和Gamma电路001连接。该电压补偿电路003可以通过如下方法进行电压补偿，如图6所示，该方法可以包括以下步骤：
步骤S101、在OLED显示屏01开启后的插黑阶段采集该OLED显示屏01端处的电源线ELVDD上的第一电源电压，并根据该第一电源电压获得参考电压。
在实际显示过程中，当OLED显示屏01开启电源后，在正常显示每一帧画面之前会存在一段插黑阶段，在插黑阶段OLED显示屏01会显示插黑画面，该阶段可以认为几乎不向OELD供电流，因此并根据OLED显示屏01端处的电源线ELVDD上的第一电源电压获得参考电压。
步骤S102、在显示每一帧画面时采集该电源线ELVDD上的第二电源电压，并根据该参考电压与当前获取的第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
步骤S103、将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路001，以使Gamma电路001根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节。
在具体实施时，参见图5，源驱动电路021中一般还设置有驱动电路002，Gamma电路001根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，可以产生图像数据对应的灰阶电压，然后驱动电路002可以将该灰阶电压通过提供给OLED显示屏01的数据线，从而实现画面显示。
本申请实施例提供电压补偿电路003，可以在显示每一帧画面时，根据电源线ELVDD上的第二电源电压和参考电压差值对预存的初始最大伽马电压和初始最小伽马电压进行调节，得到目标最大伽马电压和目标最小伽马电压，然后将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路001，以使Gamma电路001根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，从而实时对Vdata进行调节，进而通过调节Vdata来补偿ELVDD上的IR Drop，提升屏幕亮度。
在具体实施时，本申请中的电压补偿电路003可以集成在源驱动电路021中，当然也可以与源驱动电路021独立设置，在此不作限定。
在一种可能是实现方式中，参见图7，该电压补偿电路003可以包括：采样电路0031和处理电路0032。
采样电路0031用于在OLED显示屏01开启后的插黑阶段至少采集一次OLED显示屏01端处的电源线ELVDD上的第一电源电压，并将每一次采集的第一电源电压转换为第一数字信号后发送给处理电路0032；在显示每一帧画面时至少采集一次电源线ELVDD上的第二电源电压，并将每一次采集的第二电源电压转换为第二数字信号后发送给处理电路0032。
示例性的，采样电路0031可以是模数转换(Analog Digital Converter，ADC)电路，ADC电路的精度根据需要满足的补偿精度进行配置，例如需要满足的补偿精度为8bit，则ADC电路的精度可以配置为8-bit精度。
处理电路0032用于在插黑阶段接收采样电路0031发送的每一个第一数字信号，并根据接收的至少一个第一数字信号获得参考电压并存储参考电压；在显示每一帧画面时，接收采样电路0031发送的每一个第二数字信号，并根据当前获取的第二数字信号与存储的参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压，并将得到的目标最大伽马电压和目标最小伽马电压提供给OLED显示屏01中的Gamma电路001，以使Gamma电路001根据当前获取的目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节。
示例性的，处理电路0032可以是数字信号处理器(Digital Signal Processing，DSP)。
在该实施例中，得到的目标最大伽马电压和目标最小伽马电压为数字信号，适用于Gamma电路001为PGamma电路001的情况。PGamma电路001内部的两个DAC电路可以将目标最大伽马电压和目标最小伽马电压分别转换为两个模拟信号，从而PGamma电路001可以根据该两个模拟信号进行Gamma曲线调节，生成图像数据对应的灰阶电压。
可选的，本申请中，处理电路0032可以根据1个第一数字信号获得参考电压，也可以根据多个第一数字信号获得参考电压，在此不作限定。
示例性的，为了提高参考电压的准确度，可以根据多个第一数字信号获得参考电压。
在一种可能实现方式中，处理电路0032可以根据接收的多个第一数字信号的平均值计算参考电压。
在一种示例中，处理电路0032可以先确定当前获取的该第二数字信号与存储的该参考电压的差值是否大于阈值；如果当前获取的该第二数字信号与存储的该参考电压的差值大于阈值，则根据该差值分别调节该初始最大伽马电压和初始最小伽马电压，得到该目标最大伽马电压和该目标最小伽马电压。例如VGSP(1)＝VGSP(0)-K*(V2-Vref)，VGMP(1)＝VMSP(0)-K*(V2-Vref)。其中，VGSP(1)表示目标最小伽马电压，VGMP(1)表示目标最大伽马电压，VGSP(0)表示初始最小伽马电压，VGMP(1)表示初始最大伽马电压，V2表示第二数字信号，Vref表示参考电压，K表示调节系数，可以是预先存储的，也可以是由其它电路输入给处理器的，在此不作限定。示例性的，K＝0.8～1.5。
本申请对该阈值的大小不作限定，该阈值可以为0，当然也可以大于0，具体可以根据实际产品进行设计。
进一步地，如果当前获取的该第二数字信号与存储的该参考电压的差值小于或等于该阈值，则该目标最大伽马电压等于该目标最大伽马电压，该目标最小伽马电压等于该初始最小伽马电压。
相应地，本申请实施例还提供了一种电压补偿方法，如图6所示，该电压补偿方法可以包括以下步骤：
步骤S101、在OLED显示屏01开启后的插黑阶段采集该OLED显示屏01端处的电源线ELVDD上的第一电源电压，并根据该第一电源电压获得参考电压。
示例性的，在OLED显示屏01开启后的插黑阶段至少采集一次OLED显示屏01端处的电源线ELVDD上的第一电源电压，并将每一次采集的第一电源电压转换为第一数字信号，根据至少一个第一数字信号获得参考电压并存储参考电压。
可选的，可以根据多个第一数字信号的平均值计算参考电压。
步骤S102、在显示每一帧画面时采集该电源线ELVDD上的第二电源电压，并根据该参考电压与当前获取的第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
示例性的，在显示每一帧画面时至少采集一次电源线ELVDD上的第二电源电压，并将每一次采集的第二电源电压转换为第二数字信号，根据当前获取的第二数字信号与存储的参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
在一种可能的实现方式中，可以先确定当前获取的第二数字信号与存储的参考电压的差值是否大于阈值；如果当前获取的该第二数字信号与存储的该参考电压的差值大于阈值，则根据该差值分别调节初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
进一步地，如果当前获取的该第二数字信号与存储的该参考电压的差值小于或等于阈值，则目标最大伽马电压等于目标最大伽马电压，目标最小伽马电压等于初始最小伽马电压。
步骤S103、将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路001，以使Gamma电路001根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节。
下面结合具体实施例说明本申请实施例提供的电压补偿电路003及电压补偿方法。需要说明的是，本实施例中是为了更好的解释本申请，但不限制本申请。
参见图8，图8为本申请一种实施例提供的显示器对应的时序图。当OLED显示屏01开启后，EN-AVC信号为电压补偿的使能控制信号，EN-AVC为高电平表示需要进行电压补偿，EN-AVC为低电平表示不需要进行电压补偿。Mute信号为高电平时表示为插黑阶段，Mute信号为低电平时表示为正常的画面显示阶段。结合图8，图9为本申请一种实施例提供的电压补偿电路003的结构示意图。本申请的实现分为两个阶段：采样无IR Drop时的ELVDD和正常的补偿阶段。ADC电路采样OLED显示屏01端处的电源线ELVDD上的电压，并将采集的电压转换成数字信号发送给DSP进行处理。
参考图10，图10为图9所示的电压补偿电路003在进行电压补偿时的流程示意图，结合图8所示的时序图，当OLED显示屏01开启后，确定EN-AVC是否等于1，如果EN-AVC＝1，则确定Mute是否等于1，如果Mute＝1，OLED显示屏01进入插黑阶段，OLED显示屏01显示插黑画面，可以认为几乎不给OLED提供电流。插黑阶段时，ADC电路采集电源线ELVDD上无IR Drop的第一电源电压，并将第一电源电压转化为第一数字信号后发送给DSP；DSP会根据接收的第一数字信号获得参考电压，并存储该参考电压。插黑画面结束后，Mute＝0，在显示每一帧画面时，ADC电路将电源线ELVDD上有IR Drop的第二电源电压转化为第二数字信号后发送给DSP，DSP确定当前获取的第二数字信号与存储的参考电压的差值是否大于阈值；如果当前获取的第二数字信号与存储的参考电压的差值大于所述阈值，则根据该差值分别调节初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。如果当前获取的第二数字信号与存储的参考电压的差值小于或等于该阈值，则目标最大伽马电压等于目标最大伽马电压，目标最小伽马电压等于初始最小伽马电压。最后DSP将得到的目标最大伽马电压和目标最小伽马电压提供给PGamma电路001；PGamma电路001内部的两个DAC电路可以将目标最大伽马电压和目标最小伽马电压分别转换为两个模拟信号，从而PGamma电路001可以根据该两个模拟信号进行Gamma曲线调节，从而生成图像数据对应的灰阶电压。
本申请实施例提供的电压补偿电路003，可以通过补偿最小伽马电压和最大伽马电压间接补偿电源线ELVDD上的IR Drop。并且本申请实施例的实现只需要在原有的源驱动电路021的基础上引入一个ADC和DSP，成本比较低，且不需要占用显示屏的面积，并且通过使用高精度的ADC可以实现快速 高精度的ELVDD补偿。
相应地，参见图11，本申请还提供了一种源驱动电路021，包括本申请实施例提供的上述任一种电压补偿电路003和与该电压补偿电路003连接的Gamma电路001。可以在显示每一帧画面时，根据电源线ELVDD上的第二电源电压和参考电压差值对预存的初始最大伽马电压和初始最小伽马电压进行调节，得到目标最大伽马电压和目标最小伽马电压，然后将得到的目标最大伽马电压和目标最小伽马电压提供给Gamma电路001。Gamma电路001可以根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，实时对Vdata进行调节，从而通过调节Vdata来补偿电源线ELVDD上的IR Drop，提升屏幕显示亮度。
继续参见图11，源驱动电路021中还包括驱动电路002，Gamma电路001根据目标最大伽马电压和目标最小伽马电压进行Gamma曲线调节，可以产生图像数据对应的灰阶电压，然后驱动电路002可以将该灰阶电压通过提供给OLED显示屏01的数据线，从而实现画面显示。
相应地，本申请还提供了一种显示器，包括OLED显示屏01和本申请实施例提供的源驱动电路021，该源驱动电路021用于驱动该OLED显示屏01。该显示器的结构可以参见图5。该显示器可以为：手机、平板电脑、电视机、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。该显示器的实施可以参见上述源驱动电路021的实施例，重复之处不再赘述。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的保护范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (12)

  1. 一种电压补偿电路，其特征在于，所述电压补偿电路应用于显示器中，所述显示器包括OLED显示屏和伽马电路；所述电压补偿电路用于：
    在所述OLED显示屏开启后的插黑阶段采集所述OLED显示屏端处的电源线上的第一电源电压，并根据所述第一电源电压获得参考电压；
    在显示每一帧画面时采集所述电源线上的第二电源电压，并根据所述参考电压与当前获取的所述第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压；
    将得到的所述目标最大伽马电压和所述目标最小伽马电压提供给所述伽马电路，以使所述伽马电路根据所述目标最大伽马电压和所述目标最小伽马电压进行Gamma曲线调节。
  2. 如权利要求1所述的电压补偿电路，其特征在于，所述电压补偿电路包括：采样电路和处理电路；
    所述采样电路用于在所述OLED显示屏开启后的插黑阶段至少采集一次所述OLED显示屏端处的电源线上的第一电源电压，并将每一次采集的所述第一电源电压转换为第一数字信号后发送给所述处理电路；在显示每一帧画面时至少采集一次所述电源线上的第二电源电压，并将每一次采集的所述第二电源电压转换为第二数字信号后发送给所述处理电路；
    所述处理电路用于在所述插黑阶段接收所述采样电路发送的每一个所述第一数字信号，并根据接收的至少一个所述第一数字信号获得参考电压并存储所述参考电压；在显示每一帧画面时，接收所述采样电路发送的每一个所述第二数字信号，并根据当前获取的所述第二数字信号与存储的所述参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压，并将得到的所述目标最大伽马电压和所述目标最小伽马电压提供给所述OLED显示屏中的伽马电路，以使所述伽马电路根据当前获取的所述目标最大伽马电压和所述目标最小伽马电压进行Gamma曲线调节。
  3. 如权利要求2所述的电压补偿电路，其特征在于，所述处理电路用于根据接收的多个所述第一数字信号获得参考电压，包括：
    所述处理电路用于根据接收的多个所述第一数字信号的平均值获得所述参考电压。
  4. 如权利要求2或3所述的电压补偿电路，其特征在于，所述处理电路用于根据当前获取的所述第二数字信号与存储的所述参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压，包括：
    确定当前获取的所述第二数字信号与存储的所述参考电压的差值是否大于阈值；
    如果当前获取的所述第二数字信号与存储的所述参考电压的差值大于所述阈值，则根据所述差值分别调节所述初始最大伽马电压和初始最小伽马电压，得到所述目标最大伽马电压和所述目标最小伽马电压。
  5. 如权利要求4所述的电压补偿电路，其特征在于，所述处理电路还用于：
    如果当前获取的所述第二数字信号与存储的所述参考电压的差值小于或等于所述阈值，则所述目标最大伽马电压等于所述目标最大伽马电压，所述目标最小伽马电压等于所述初始最小伽马电压。
  6. 一种源驱动电路，其特征在于，包括如权利要求1-5任一项所述的电压补偿电路和与所述电压补偿电路连接的伽马电路。
  7. 一种显示器，其特征在于，包括OLED显示屏和如权利要求6所述的源驱动电路，所述驱动电路用于驱动所述OLED显示屏。
  8. 一种电压补偿方法，其特征在于，包括：
    在OLED显示屏开启后的插黑阶段采集所述OLED显示屏端处的电源线上的第一电源电压，并根据所述第一电源电压获得参考电压；
    在显示每一帧画面时采集所述电源线上的第二电源电压，并根据所述参考电压与当前获取的所述第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压；
    将得到的所述目标最大伽马电压和所述目标最小伽马电压提供给伽马电路，以使所述伽马电路根据所述目标最大伽马电压和所述目标最小伽马电压进行Gamma曲线调节。
  9. 如权利要求8所述的电压补偿方法，其特征在于，在OLED显示屏开启后的插黑阶段采集所述OLED显示屏端处的电源线上的第一电源电压，并根据所述第一电源电压获得参考电压，包括：
    在所述OLED显示屏开启后的插黑阶段至少采集一次所述OLED显示屏端处的电源线上的第一电源电压，并将每一次采集的所述第一电源电压转换为第一数字信号，根据至少一个所述第一数字信号获得参考电压并存储所述参考电压；
    在显示每一帧画面时采集所述电源线上的第二电源电压，并根据所述参考电压与当前获取的所述第二电源电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压，包括：
    在显示每一帧画面时至少采集一次所述电源线上的第二电源电压，并将每一次采集的所述第二电源电压转换为第二数字信号，根据当前获取的所述第二数字信号与存储的所述参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压。
  10. 如权利要求9所述的电压补偿方法，其特征在于，根据多个所述第一数字信号获得参考电压，包括：
    根据多个所述第一数字信号的平均值获得所述参考电压。
  11. 如权利要求9或10所述的电压补偿方法，其特征在于，根据当前获取的所述第二数字信号与存储的所述参考电压的差值调节预存的初始最大伽马电压和初始最小伽马电压，得到目标最大伽马电压和目标最小伽马电压，包括：
    确定当前获取的所述第二数字信号与存储的所述参考电压的差值是否大于阈值；
    如果所述差值大于所述阈值，则根据所述差值分别调节所述初始最大伽马电压和初始最小伽马电压，得到所述目标最大伽马电压和所述目标最小伽马电压。
  12. 如权利要求11所述的电压补偿方法，其特征在于，还包括：
    如果所述差值小于或等于所述阈值，则所述目标最大伽马电压等于所述目标最大伽马电压，所述目标最小伽马电压等于所述初始最小伽马电压。
PCT/CN2023/108887 2022-11-03 2023-07-24 电压补偿电路、源驱动电路、显示器及电压补偿方法 WO2024093382A1 (zh)

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