WO2020233590A1 - 电压控制电路及电源电压控制方法、显示装置 - Google Patents

电压控制电路及电源电压控制方法、显示装置 Download PDF

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Publication number
WO2020233590A1
WO2020233590A1 PCT/CN2020/091244 CN2020091244W WO2020233590A1 WO 2020233590 A1 WO2020233590 A1 WO 2020233590A1 CN 2020091244 W CN2020091244 W CN 2020091244W WO 2020233590 A1 WO2020233590 A1 WO 2020233590A1
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Prior art keywords
voltage
pixel
display
control circuit
current frame
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PCT/CN2020/091244
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English (en)
French (fr)
Inventor
梁恒镇
田雪松
徐文
陆旭
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Priority to US17/269,546 priority Critical patent/US11386855B2/en
Publication of WO2020233590A1 publication Critical patent/WO2020233590A1/zh

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    • 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
    • G09G3/2003—Display of colours
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    • 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]
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    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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Definitions

  • the embodiments of the present disclosure relate to a voltage control circuit, a power supply voltage control method, and a display device.
  • OLED Organic Light-Emitting Diode
  • At least one embodiment of the present disclosure provides a voltage control circuit
  • the voltage control circuit is used to connect to a display panel
  • the display panel includes a plurality of pixels
  • the plurality of pixels includes a first pixel and a second pixel
  • the The first pixel and the second pixel are pixels of different colors.
  • the voltage control circuit is configured to provide a first voltage to the first pixel and a second voltage to the second pixel at a first time and a second time, respectively; at the first time, the first voltage Different from the second voltage; at the second time, the first voltage and the second voltage are the same.
  • the voltage control circuit is further configured to: determine whether the current frame picture of the display panel is a risk picture, and if the display picture of the current frame is a risk picture, the The first time is within the current frame.
  • the voltage control circuit is further configured to: obtain the first grayscale value of the display image of the current frame and the second grayscale value of the display image of the previous frame of the display panel; The first grayscale value and the second grayscale value determine whether the display picture of the current frame is a risk picture.
  • the plurality of pixels are divided into n display units, and the voltage control circuit is further configured to: calculate the first grayscale value of the display screen of the n display units in the current frame and N differences between the second grayscale value of the display screen of the previous frame; when the first grayscale value of the display screen of the current frame of the n display units and the display of the previous frame When the number of n differences between the second grayscale values of the screen that is greater than the preset difference is greater than the preset value n*k, it is determined that the display screen of the current frame is the risk screen, and n is greater than 1. An integer of ten thousand, 0 ⁇ k ⁇ 1.
  • k is greater than or equal to 75%.
  • the voltage control circuit is further configured to: obtain the first grayscale value of the display screen of the current frame of the display panel and the second grayscale value of the display screen of the previous frame, and obtain The brightness value of the display screen of the previous frame of the display panel is determined according to the first gray scale value, the second gray scale value and the brightness value whether the display screen of the current frame is the Risk picture.
  • the voltage control circuit is further configured to: calculate the first gray scale value of the display screen of the current frame and the second gray scale value of the display screen of the previous frame of the n display units. N differences between the gradation values; when the brightness value of the display screen of the previous frame is less than the preset brightness value, and the first gray scale value of the display screen of the current frame of the n display units is equal to the upper When the number of n differences between the second grayscale values of the display image of one frame that is greater than the preset difference is greater than the preset value, it is determined that the display image of the current frame is the risk image.
  • the voltage control circuit is further configured to: the plurality of pixels further include a third pixel, and the first pixel, the second pixel, and the third pixel are pixels of different colors; The voltage control circuit is further configured to respectively provide a third voltage to the third pixel at the first time and the second time; at the first time, the first voltage, the second voltage, and The third voltages are all different; at the second time, the first voltage, the second voltage, and the third voltage are the same.
  • the voltage control circuit is further configured to: when the display screen of the current frame is the risk screen, send to the first pixel, the second pixel, and the first pixel at the first time.
  • the third pixel provides the first voltage, the second voltage, and the third voltage.
  • the first pixel is a red pixel
  • the second pixel is a green pixel
  • the third pixel is a blue pixel.
  • the first voltage is less than the third pixel.
  • the third voltage is less than the second voltage.
  • the voltage control circuit is further configured to: when the display screen of the current frame is the risk screen, pull up the second voltage and the third voltage, and maintain the first voltage constant.
  • At least one embodiment of the present disclosure further provides a display device including the above-mentioned voltage control circuit and a display panel.
  • the display panel includes a first power supply voltage terminal and a second power supply voltage terminal, the first pixel is connected to the first power supply voltage terminal to receive the first voltage, and the second pixel is connected to the second power supply
  • the voltage terminal is connected to receive the second voltage; the voltage control circuit is respectively connected to the first power supply voltage terminal and the second power supply voltage terminal to provide the first voltage and the second voltage.
  • the first pixel includes a first pixel circuit and a first light-emitting element connected to the first pixel circuit
  • the second pixel includes a second pixel circuit and a first pixel circuit connected to the second pixel circuit.
  • the second light-emitting element, the first light-emitting element and the second light-emitting element are configured to emit light of different colors.
  • the first pixel circuit and the second pixel circuit respectively include a driver sub-circuit
  • the driver sub-circuit includes a control terminal, a first terminal, and a second terminal
  • the driver of the first pixel circuit The first terminal of the circuit is configured to receive the first voltage from the first power terminal, the second terminal is connected to the first light-emitting element, and the driving sub-circuit of the first pixel circuit is configured to respond to the signal from the The first voltage at the first power supply voltage terminal forms the driving current flowing through the first light-emitting element; the first terminal of the driving sub-circuit of the second pixel circuit is configured to receive the first power terminal from the second power supply terminal.
  • the second terminal is connected to the second light-emitting element, and the driving sub-circuit of the second pixel circuit is configured to flow through the second light-emitting element in response to the second voltage from the second power supply voltage terminal.
  • the drive current of the component is configured to flow through the second light-emitting element in response to the second voltage from the second power supply voltage terminal.
  • the display device further includes a first power line and a second power line, and the first power line connects the first power voltage terminal with the first terminal of the driver subcircuit of the first pixel circuit. Electrically connected, the second power line electrically connects the second power voltage terminal and the first terminal of the driving sub-circuit of the second pixel circuit; the first power line is insulated from the second power line.
  • At least one embodiment of the present disclosure further provides a power supply voltage control method for providing a power supply voltage to a display panel.
  • the display panel includes a plurality of pixels.
  • the plurality of pixels includes a first pixel and a second pixel.
  • a pixel and the second pixel are pixels of different colors, and the method includes: providing a first voltage to the first pixel at a first time and a second time, and providing a second voltage to the second pixel ; At the first time, the first voltage and the second voltage are different; at the second time, the first voltage and the second voltage are the same.
  • the method includes: determining whether the display screen of the current frame of the display panel is a risk screen, and when the display screen of the current frame is a risk screen, the first time is within the current frame .
  • determining whether the display image of the current frame of the display panel is the risk image includes: acquiring the first grayscale value of the display image of the current frame of the display panel and the first grayscale value of the display image of the previous frame. Two grayscale values; judging whether the display screen of the current frame is the risk screen according to the first grayscale value and the second grayscale value.
  • the plurality of pixels are divided into n display units, and determining whether the display picture of the current frame is the risk picture according to the first grayscale value and the second grayscale value includes: Calculate the difference between the first gray scale value of the display screen of the current frame and the second gray scale value of the display screen of the previous frame for the n display units; when the n display units The number of n differences between the first grayscale value of the display image of the current frame and the second grayscale value of the display image of the previous frame of the unit is greater than the preset value n*
  • n is an integer greater than 10,000, and 0 ⁇ k ⁇ 1.
  • k is greater than or equal to 75%.
  • FIG. 1 is a schematic structural diagram of a driving circuit of a pixel array
  • Figure 2 is a graph of the startup brightness-time curve of a RGB pixel
  • Figure 3 is a starting current-time curve diagram of a RGB pixel
  • FIG. 4A is a schematic structural diagram of a voltage control circuit according to an embodiment of the present disclosure.
  • 4B is a schematic structural diagram of a display device provided by at least one embodiment of the present disclosure.
  • FIG. 5 is a schematic diagram of the structure of a voltage control circuit according to another embodiment of the present disclosure.
  • FIG. 6 is a graph of the driving voltage of each pixel in an example of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a basic pixel architecture of an example of the present disclosure.
  • FIG. 8 is a graph of the startup current-time curve of an RGB pixel according to an example of the present disclosure.
  • FIG. 9 is a graph of the startup brightness-time curve of an RGB pixel according to an example of the present disclosure.
  • FIG. 10 is a structural block diagram of a display panel of an embodiment of the present disclosure.
  • FIG. 11 is a structural block diagram of a display device of an embodiment of the present disclosure.
  • FIG. 12 is a flowchart of a power supply voltage control method according to an embodiment of the present disclosure.
  • EL materials of different colors such as red (R) luminescent materials, green (G) luminescent materials, blue light (B) Luminescent materials
  • R red
  • G green
  • B blue light
  • the display screen (such as a static display screen) or a display screen with a high refresh rate (such as higher than 120HZ)
  • the display screen (such as a partial screen) changes from low grayscale to high grayscale and adjacent
  • the gray scale difference of the frame display picture for example, partial picture
  • the residual color smear phenomenon will appear at the edge of the light and dark junction of the picture, which reduces the display quality.
  • this phenomenon is particularly obvious when the brightness of the previous frame is low (for example, less than 50 nits).
  • pixels such as R, G, and B pixels
  • ELVDD driving voltage
  • FIG. 1 For example, pixels of different colors in the same row are all connected to the same power line ELVDD to receive the same driving voltage ELVDD.
  • the driving voltage ELVDD an example of the starting brightness-time curve and the starting current-time curve are shown in Figs. 2 and 3 respectively.
  • each pixel undergoes a lighting stage before reaching a stable brightness to obtain a stable display screen.
  • the duration is several frames (for example, 4 frames).
  • the response time (turn-on time) of the three colors of luminescent materials of red (R), green (G) and blue (B) to the starting current and The response speeds are different.
  • the blue luminescent material emits light first but the brightness increases the slowest, the red luminescent material emits faster and the brightness increases, and the green luminescent material emits the latest but the brightness increases the fastest.
  • the present disclosure proposes a voltage control circuit, a power supply voltage control method, and a display device.
  • FIG. 4A is a schematic structural diagram of a voltage control circuit according to an embodiment of the present disclosure
  • FIG. 4B is a schematic structural diagram of a display device provided by an embodiment of the present disclosure.
  • the voltage control circuit 203 is used to connect to the display panel 20 to provide the power supply voltage ELVDD.
  • the display panel includes a plurality of pixels 100 including red pixels, green pixels, and blue pixels.
  • the plurality of pixels includes a first pixel 101 and a second pixel 102, and the first pixel 101 and the second pixel 102 are pixels of different colors.
  • the voltage control circuit 203 is used to provide a first voltage ELVDD1 to the first pixel 101 and a second voltage ELVDD2 to the second pixel 102 at a first time t1 and a second time t2 respectively; at the first time t1, the first The voltage is different from the second voltage; at the second time t2, the first voltage and the second voltage are the same.
  • the first pixel 101 may be a red pixel
  • the second pixel 102 may be a green pixel or a blue pixel.
  • the voltage control circuit 203 outputs different power supply voltages to the first pixel and the second pixel during the lighting phase. .
  • Reduce the difference in the light-up speed of the first pixel and the second pixel, that is, the difference in the brightness change per unit time under the same current is reduced, thereby alleviating the smear phenomenon.
  • the first voltage and the second voltage in the lighting phase can be adjusted according to the response characteristics of the luminescent materials of different colors shown in FIG. 2 to the starting current. This will be described in detail later.
  • the display device 30 includes a display panel 20 and the voltage control circuit 203, and the voltage control circuit 203 is electrically connected to the display panel 20 to provide a power supply voltage ELVDD for the pixel circuit.
  • the display panel 20 includes a display area 110 and a non-display area 103 outside the display area 110.
  • the non-display area 103 is located in the peripheral area of the display area 110.
  • the display panel 20 includes a plurality of pixels 100 located in the display area 110.
  • the plurality of pixels are arranged in an array along a first direction D1 and a second direction D2, the first direction D1 and the second direction D2 are different, for example, the two are orthogonal.
  • the sub-pixels may form pixel units in a traditional RGB manner or a sub-pixel sharing manner (for example, pentile) to realize full-color display.
  • the present disclosure does not limit the arrangement of sub-pixels and the manner in which they realize full-color display.
  • the display panel 20 further includes a plurality of scan lines 11 and a plurality of data lines 12 located in the display area 110, and the plurality of scan lines 11 and the plurality of data lines 12 cross each other to define a plurality of pixel areas in the display area 110, One pixel 100 is correspondingly provided in each pixel area.
  • the scan line 11 extends along the first direction D1
  • the data line 12 extends along the second direction D2.
  • Each pixel 100 includes a pixel circuit and a light-emitting element, and the pixel circuit is used to drive the light-emitting element to emit light.
  • the pixel circuit is, for example, a conventional pixel circuit, such as a 2T1C (that is, two transistors and a capacitor) pixel circuit, 4T2C, 5T1C, 7T1C and other nTmC (n, m are positive integers) pixel circuits, and in different embodiments,
  • the pixel circuit may further include a compensation sub-circuit.
  • the compensation sub-circuit includes an internal compensation sub-circuit or an external compensation sub-circuit.
  • the compensation sub-circuit may include a transistor, a capacitor, and the like.
  • the pixel circuit may further include a reset circuit, a light emission control sub-circuit, a detection circuit, and the like.
  • the light emitting element is an organic light emitting diode (OLED).
  • the display panel 20 may also include a gate driving circuit 13 and a data driving circuit 14 located in the non-display area 103.
  • the gate driving circuit 13 may be connected to the pixel circuit through the scan line 11 to provide various scan signals or control signals for the pixels;
  • the data driving circuit 14 may be connected to the pixel circuit through the data line 12 to provide data signals.
  • the display panel 20 also includes a plurality of power lines to provide power voltages for the pixel circuits of each pixel.
  • the display panel 20 includes a first power line 201 and a second power line 202.
  • the first power line 201 is connected to the first pixel 101 to provide the first pixel 101 with a first voltage ELVDD1
  • the second power line 202 is connected to the second pixel 102 to provide a second voltage ELVDD2 to the second pixel 102.
  • the first power line 201 and the second power line 202 both extend along the first direction D1 and are insulated from each other.
  • the non-display area 103 is provided with a bonding area 130, and the bonding area is provided with a plurality of bonding electrodes or signal terminals, and the bonding electrodes are connected to circuits in the display substrate 20 (such as gate drive circuits) through wiring. 13) Or the power line is connected and used for bonding with external circuits (such as IC chips) to provide electrical signals (such as clock signals, power voltage signals, etc.) for the circuits or signal lines in the display substrate.
  • the first power line 201 and the second power line 202 respectively pass through the wiring 135 in the non-display area 103 and the first power voltage terminal 131 and the second power voltage terminal in the bonding area 130.
  • the wiring 135 has a ring shape and is arranged around the display area 110.
  • the voltage control circuit 203 is connected to the display panel 20 by means of bonding.
  • the voltage control circuit 203 is mounted on a flexible circuit board (FPC, not shown), and is bonded to the display panel 20 through the flexible circuit board.
  • the voltage control circuit 203 can also be directly integrated in the display panel 20.
  • the embodiment of the present disclosure does not limit the connection manner of the voltage control circuit 203 and the display panel 20.
  • the display panel 20 may also include a control circuit (not shown).
  • the control circuit is configured to control the data driving circuit 14 to apply the data signal, and the gate driving circuit 13 to apply the scan signal or control signal.
  • An example of this control circuit is a timing control circuit (T-con).
  • the control circuit may be in various forms, for example, including a processor and a memory.
  • the memory includes executable code, and the processor runs the executable code to execute the power supply voltage control method described above.
  • the processor may be a central processing unit (CPU) or other form of processing device with data processing capability and/or instruction execution capability, for example, may include a microprocessor, a programmable logic controller (PLC), and the like.
  • CPU central processing unit
  • PLC programmable logic controller
  • the storage device may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and/or nonvolatile memory.
  • Volatile memory may include random access memory (RAM) and/or cache memory (cache), for example.
  • the non-volatile memory may include read-only memory (ROM), hard disk, flash memory, etc., for example.
  • One or more computer program instructions can be stored on a computer-readable storage medium, and the processor can execute functions desired by the program instructions.
  • Various application programs and various data can also be stored in the computer-readable storage medium.
  • the voltage control circuit sets different power lines for different first pixels and second pixels, and applies the first voltage and the second voltage to each power line through the voltage control circuit to apply the first voltage and the second voltage to the first pixel and the second pixel.
  • Differential control of the current characteristics of the luminescent material will help improve the quality of the display and solve the smear problem caused by the different lighting characteristics of the luminescent materials.
  • the voltage control circuit 203 is used to determine whether the display picture of the current frame of the display panel is a risk picture; and when the display picture of the current frame is a risk picture, the first time t1 is at the current Within the frame.
  • the voltage control circuit analyzes the display data of the display screen of the current frame to determine whether the display screen of the current frame is at risk of the above-mentioned smear and other problems, and then the current frame
  • the output first voltage and/or the second voltage are adjusted to reduce the difference in the lighting speed of the first pixel 101 and the second pixel 102.
  • the voltage control circuit 203 is used to obtain the first gray scale value of the display screen of the current frame and the second gray scale value of the previous frame of the display screen of the display panel, and according to the first gray scale value and the second gray scale value.
  • the order value determines whether the display screen of the current frame is a risk screen.
  • multiple pixels can be divided into multiple display units (for example, n display units are denoted as D1 to Dn), and the voltage control circuit 203 is used to calculate the first gray of the display screen of the current frame of the n display units.
  • each display unit includes 25 (5*5) pixels or 100 (10*10) pixels, and the n display units are denoted as D1 to Dn, respectively.
  • the first voltage ELVDD1 and/or the second voltage ELVDD2 need to be adjusted, for example, according to the light emission of the first pixel 101 and the second pixel 102 Material characteristics.
  • the first voltage ELVDD1 or the second voltage ELVDD2 is distinguished.
  • the voltage of the sub-pixels is increased, so as to realize the Over Drive of the driving current of each pixel (that is, the speed-increasing drive), reducing the first pixel 101 and
  • the difference between the lighting time and the lighting brightness of the second pixel 102 makes the first pixel 101 and the second pixel 102 quickly reach the same brightness level.
  • n is an integer greater than 10,000, such as between 50,000 and 300,000, such as between 100,000 and 180,000.
  • k is a constant greater than 0 and less than or equal to 1, and its value can be set as required, for example, k is greater than or equal to 75%.
  • the voltage control circuit 203 is further configured to obtain the first grayscale value of the display screen of the current frame and the second grayscale value of the previous frame of the display screen of the display panel, and the upper According to the brightness value of a frame of display screen, it is determined whether the display screen of the current frame is a risk screen according to the first gray scale value, the second gray scale value and the brightness value.
  • the voltage control circuit 203 is used to calculate the difference between the first gray-scale value of the display screen of the current frame and the second gray-scale value of the display screen of the previous frame. Difference; when the brightness value of the display screen of the previous frame is less than the preset brightness value, and the first grayscale value of the display screen of the current frame of the n display units is compared with the first grayscale value of the display screen of the previous frame When the number of n differences between the two gray scale values that are greater than the preset difference is greater than the preset value, it is determined that the display screen of the current frame is the risk screen.
  • the preset brightness value is 50 nits.
  • the difference between this embodiment and the previous embodiment is that when determining whether the current picture is a risk picture, the brightness of the previous frame of the display picture is also considered. Since the smear phenomenon is more obvious when the brightness of the display screen in the previous frame is low, this example improves the performance by considering the brightness of the display screen in the previous frame and judging the risk of the display screen in the current frame.
  • the voltage control circuit improves the efficiency and effect of the display picture.
  • the plurality of sub-pixels may further include a third pixel 103.
  • the first pixel 101, the second pixel 102, and the third pixel 103 are pixels of different colors. .
  • the voltage control circuit 203 is also used to provide the third voltage ELVDD3 to the third pixel at the first time and the second time respectively.
  • the display panel 20 may further include a third power supply line 204 for connecting the third power supply voltage terminal 133 to the third pixel 103 to provide the third pixel 103 with a third voltage ELVDD3.
  • the voltage control circuit 203 is also connected to the third power line 203 to output the third voltage ELVDD3 to the third power line 204.
  • the voltage control circuit 203 can adjust at least one of the first voltage ELVDD1, the second voltage ELVDD2, and the third voltage ELVDD3 when judging that the display picture of the current frame is a risk picture, so as to reduce the first pixel 101, the second pixel 102 and The difference in the lighting speed of the third pixel 103.
  • the first voltage, the second voltage, and the third voltage are all different; at the second time, the first voltage, the second voltage, and the The third voltage is the same.
  • the first pixel 101 may be a red pixel
  • the second pixel 102 may be a green pixel
  • the third pixel 103 may be a blue pixel.
  • FIG. 6 shows a schematic diagram of waveforms of the first voltage, the second voltage, and the third point voltage output by a voltage control circuit provided by an embodiment of the present disclosure.
  • the power supply voltage ELVDD received by the three color pixels are all different; at the second time t2, the power supply voltage ELVDD received by the three color pixels are all the same, which is the reference voltage V0.
  • the first time t1 is in the light-up phase of the display panel
  • the second time t2 is in the stable phase after the light-up phase.
  • the voltage control circuit reduces the difference in the light-up speed of the first pixel, the second pixel, and the third pixel by providing power supply voltages to the first pixel, the second pixel, and the third pixel, that is, the same
  • the difference in brightness change per unit time under current is reduced, thereby alleviating the smear phenomenon.
  • the first voltage and the second voltage are both the reference voltage V0.
  • the first voltage ELVDD1 may be less than the third voltage ELVDD3, and the third voltage ELVDD3 may be less than the second voltage ELVDD2.
  • the working principle of the voltage control circuit of the embodiment of the present disclosure is described below based on the example shown in FIG. 5 in conjunction with FIGS. 6-9.
  • the pixel circuit of each pixel includes a driving sub-circuit including a control terminal, a first terminal, and a second terminal, and the driving sub-circuit is configured to form a current flowing through the light emitting element in response to a power supply voltage from a power supply voltage terminal. .
  • the first pixel includes a first pixel circuit and a first light-emitting element
  • the second pixel includes a second pixel circuit and a second light-emitting element
  • the first terminal of the driving sub-circuit of the first pixel circuit is configured from the first power terminal 131 Receiving the first voltage
  • the second terminal is connected to the first light-emitting element
  • the driving sub-circuit of the first pixel circuit is configured to flow through the first light-emitting element in response to the first voltage ELVDD1 from the first power supply voltage terminal 131 The drive current.
  • the first terminal of the driving sub-circuit of the second pixel circuit is configured to receive the second voltage from the second power supply terminal 132, the second terminal is connected to the second light-emitting element, and the driving sub-circuit of the second pixel circuit is configured to respond
  • the second voltage ELVDD2 from the second power supply voltage terminal 132 forms a driving current flowing through the second light-emitting element.
  • the driving sub-circuit includes a driving transistor, and the gate, first electrode, and second electrode of the driving transistor are respectively used as the control terminal, the first terminal and the second terminal of the driving sub-circuit.
  • the driving transistors may all be thin film transistors or field effect transistors or other switching devices with the same characteristics.
  • the source and drain of the transistor used here can be symmetrical in structure, so the source and drain can be structurally indistinguishable. In the embodiments of the present disclosure, in order to distinguish the two poles of the transistor other than the gate, one pole is directly described as the first pole and the other pole is the second pole.
  • the driving transistor may be directly electrically connected to the power supply voltage terminal, or a first light emitting control transistor may be connected to the power supply voltage terminal; the driving transistor may be directly electrically connected to the light emitting element or directly connected to the light emitting element The second light emission control transistor.
  • the first terminal and the second terminal of the driving transistor are directly electrically connected to the power supply voltage terminal and the light-emitting element as an example.
  • the basic pixel structure shown in Figure 7 includes a driving transistor Q1, a storage capacitor C1, and a light-emitting element D1.
  • the channel opening degree of the driving transistor Q1 controls the current I1 flowing through the light-emitting diode D1, and the driving voltage ELVDD and N1 point ( The voltage difference of the gate node of the driving transistor can control the opening degree of the channel of the driving transistor Q1.
  • the ELVDD voltage can be increased at the moment the channel is turned on (that is, the light-up phase), and the current flowing through D1 can be instantaneously changed, thereby controlling the sub-pixels of different colors The brightness of the light, while not affecting the display brightness in the normal state.
  • the startup current-time curve corresponding to each pixel is shown in FIG. 8, and the startup brightness-time curve is shown in FIG. 9. It can be seen from Figure 8 and Figure 9 that by pulling up the second voltage and the third voltage, the current flowing through the green light-emitting element and the blue light-emitting element is increased, and the three colors of pixels are reduced during the light-up phase. The difference in brightness, thereby effectively alleviating the smear phenomenon.
  • each pixel undergoes the above-mentioned lighting, and reaches its respective stable light-emitting brightness at a similar lighting speed, and the picture enters a stable stage.
  • the second voltage and the third voltage return to the reference voltage V0, and the light-emitting current and brightness of each pixel are determined by the data voltage written in the gate node N1 of the driving transistor, and the difference in the power supply voltage ELVDD is prevented from causing picture distortion.
  • the adjustment countermeasures for each power supply voltage can be set according to the device characteristics of the OLED, and are not limited to the device characteristics mentioned above.
  • different power lines can be set to apply different driving voltages respectively to control the current characteristics of each pixel differently. This can reduce the difference between the lighting time and the lighting brightness of each pixel, improve the quality of the display picture, and solve the smear problem caused by the different lighting characteristics of the luminescent material.
  • FIG. 10 is a structural block diagram of a display panel according to another embodiment of the present disclosure.
  • the display panel 300 includes the voltage control circuit 203 of the above embodiment.
  • the display panel of the embodiment of the present disclosure through the above-mentioned voltage control circuit, can reduce the difference between the lighting time and the lighting brightness of each pixel, improve the quality of the display picture, and solve the smear caused by the different lighting characteristics of the luminescent material problem.
  • FIG. 11 is a structural block diagram of a display device according to another embodiment of the present disclosure.
  • the display device 400 includes a housing 500 and the display panel 300 of the foregoing embodiment.
  • the display device 400 may be an LCD (Liquid Crystal Display) screen or an OLED (Organic Light-Emitting Diode) screen.
  • LCD Liquid Crystal Display
  • OLED Organic Light-Emitting Diode
  • the display device of the embodiment of the present disclosure adopts the above-mentioned display panel, which can reduce the difference between the lighting time and the lighting brightness of each pixel, improve the quality of the display picture, and solve the smear problem caused by the different lighting characteristics of the luminescent material .
  • At least one embodiment of the present disclosure also provides a power supply voltage control method, which is used to provide a power supply voltage to a display panel and is suitable for any of the above-mentioned voltage control circuits and display panels.
  • the method includes: providing the first voltage to the first pixel and providing the second voltage to the second pixel at a first time and a second time respectively; at the first time, the first voltage and the second voltage Different; at the second time, the first voltage and the second voltage are the same.
  • the method further includes: determining whether the display screen of the current frame of the display panel is a risk screen, and when the display screen of the current frame is a risk screen, the first time is within the current frame.
  • FIG. 12 is a flowchart of a power supply voltage control method according to an embodiment of the present disclosure.
  • the method includes the following steps:
  • S101 Determine whether the display screen of the current frame of the display panel is a risk screen
  • the driving voltage required by each type of pixel can be determined by looking up a table.
  • the EL materials of different pixels in the pixel array are different, and the electrical properties of different EL materials are also different, so the lighting voltage and lighting time of each pixel are also different at that time.
  • the driving voltage of each category of pixels can be determined according to the acquired categories of each pixel, and then corresponding drive voltages can be provided to each category of pixels. Therefore, by controlling each pixel differently, it is helpful to improve the display image quality and solve the smear problem caused by the different lighting characteristics of the luminescent materials.
  • determining whether the display image of the current frame of the display panel is the risk image includes: acquiring the first grayscale value of the display image of the current frame of the display panel and the second grayscale value of the display image of the previous frame Value; According to the first grayscale value and the second meeting medium, determine whether the display screen of the current frame is the risk screen.
  • the multiple pixels in the display panel are divided into n display units, and judging whether the display picture of the current frame is a risk picture according to the first grayscale value and the second grayscale value includes: calculating the n The display units respectively set the n differences between the first grayscale value of the display screen of the current frame and the second grayscale value of the display screen of the previous frame; when all of the n display units The number of n differences between the first grayscale value of the display image of the current frame and the second grayscale value of the display image of the previous frame is greater than the preset value n*
  • k it is determined that the display screen of the current frame is the risk screen, and 0 ⁇ k ⁇ 1. For example, k is greater than or equal to 75%.
  • the power supply voltage control method of the embodiment of the present disclosure can reduce the difference between the lighting time and the lighting brightness of each pixel by differently controlling each pixel, improve the quality of the display picture, and solve the problem caused by the different lighting characteristics of the luminescent material.
  • the smear problem can reduce the difference between the lighting time and the lighting brightness of each pixel by differently controlling each pixel, improve the quality of the display picture, and solve the problem caused by the different lighting characteristics of the luminescent material. The smear problem.
  • a "computer-readable medium” can be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, device, or device or in combination with these instruction execution systems, devices, or devices.
  • computer readable media include the following: electrical connections (electronic devices) with one or more wiring, portable computer disk cases (magnetic devices), random access memory (RAM), Read only memory (ROM), erasable and editable read only memory (EPROM or flash memory), fiber optic devices, and portable compact disk read only memory (CDROM).
  • the computer-readable medium may even be paper or other suitable media on which the program can be printed, because it can be used, for example, by optically scanning the paper or other media, and then editing, interpreting, or other suitable media if necessary. The program is processed in a manner to obtain the program electronically and then stored in the computer memory.
  • the voltage control circuit of the present disclosure can be implemented by hardware, software, firmware or a combination thereof.
  • multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system.
  • a logic gate circuit for implementing logic functions on data signals
  • PGA programmable gate array
  • FPGA field programmable gate array

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Abstract

一种电压控制电路(203)、电源电压(ELVDD)控制方法及显示装置(400)。该电压控制电路(203)用于与显示面板(20)连接，该显示面板(20)包括多个像素(100)，该多个像素(100)包括第一像素(101)和第二像素(102)，该第一像素(101)和该第二像素(102)为不同颜色的像素。该电压控制电路(203)配置为分别在第一时间(t1)和第二时间(t2)向该第一像素(101)提供第一电压(ELVDD1)以及向该第二像素(102)提供第二电压(ELVDD2)；在该第一时间(t1)，该第一电压(ELVDD1)和该第二电压(ELVDD2)不同；在该第二时间(t2)，该第一电压(ELVDD1)和该第二电压(ELVDD2)相同。该电压控制电路(203)有助于改善显示画面的质量，解决因发光材料的起亮特性不同造成的拖影问题。

Description

电压控制电路及电源电压控制方法、显示装置
本申请要求于2019年5月21日递交的中国专利申请第201910423808.3的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。
技术领域
本公开实施例涉及一种电压控制电路及电源电压控制方法、显示装置。
背景技术
随着显示技术的快速发展，作为显示装置核心的半导体元件技术也随之得到了飞跃性的进步。对于现有的显示装置而言，有机发光二极管(Organic Light-Emitting Diode，简称OLED)作为一种电流型发光器件，因其所具有的自发光、快速响应、宽视角和可制作在柔性衬底上等特点而越来越多地被应用于高性能显示技术领域当中。
发明内容
本公开至少一实施例提供一种电压控制电路，所述电压控制电路用于与显示面板连接，所述显示面板包括多个像素，所述多个像素包括第一像素和第二像素，所述第一像素和所述第二像素为不同颜色的像素。所述电压控制电路配置为分别在第一时间和第二时间向所述第一像素提供第一电压以及向所述第二像素提供第二电压；在所述第一时间，所述第一电压和所述第二电压不同；在所述第二时间，所述第一电压和所述第二电压相同。
在一些示例中，所述电压控制电路还配置为：判断所述显示面板的当前帧画面是否为风险画面的显示画面是否为风险画面，在所述当前帧的显示画面为风险画面时，所述第一时间在所述当前帧内。
在一些示例中，所述电压控制电路还配置为：获取所述显示面板的所述当前帧的显示画面的第一灰阶值和上一帧的显示画面的第二灰阶值；根据所述第一灰阶值和所述第二灰阶值判断所述当前帧的显示画面是否为风险画 面。
在一些示例中，所述多个像素被划分成n个显示单元，所述电压控制电路还配置为：计算所述n个显示单元在当所述前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的n个差值；当所述n个显示单元的当前帧的显示画面的第一灰阶值与所述上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值n*k时，判断所述当前帧的显示画面为所述风险画面，n为大于1万的整数，0<k≤1。
在一些示例中，k大于等于75％。
在一些示例中，所述电压控制电路还配置为：获取所述显示面板的所述当前帧的显示画面的第一灰阶值和所述上一帧的显示画面的第二灰阶值和获取所述显示面板的所述上一帧的显示画面的亮度值，根据所述第一灰阶值、所述第二灰阶值和所述亮度值判断所述当前帧的显示画面是否为所述风险画面。
在一些示例中，所述电压控制电路还配置为：计算所述n个显示单元分别在所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的n个差值；当所述上一帧的显示画面的亮度值小于预设亮度值，且所述n个显示单元的当前帧的显示画面的第一灰阶值与在上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值时，判断所述当前帧的显示画面为所述风险画面。
在一些示例中，所述电压控制电路还配置为：所述多个像素还包括第三像素，所述第一像素、所述第二像素和所述第三像素分别为不同颜色的像素；所述电压控制电路还配置为在所述第一时间和所述第二时间分别向所述第三像素提供第三电压；在所述第一时间，所述第一电压、所述第二电压和所述第三电压均不相同；在所述第二时间，所述第一电压、所述第二电压和所述第三电压相同。
在一些示例中，所述电压控制电路还配置为：在所述当前帧的显示画面为所述风险画面时，在所述第一时间分别向所述第一像素、所述第二像素和所述第三像素提供所述第一电压、所述第二电压和所述第三电压。
在一些示例中，所述第一像素为红色像素，所述第二像素为绿色像素，所述第三像素为蓝色像素，在所述第一时间，所述第一电压小于所述第三电 压，所述第三电压小于所述第二电压。
在一些示例中，所述电压控制电路还配置为：在所述当前帧的显示画面为所述风险画面时，拉高所述第二电压和所述第三电压，并保持所述第一电压不变。
本公开至少一实施例还提供一种显示装置，包括上述电压控制电路和显示面板。所述显示面板包括第一电源电压端和第二电源电压端，所述第一像素与所述第一电源电压端连接以接收所述第一电压，所述第二像素与所述第二电源电压端连接以接收所述第二电压；所述电压控制电路分别与所述第一电源电压端和所述第二电源电压端连接以提供所述第一电压和所述第二电压。
在一些示例中，所述第一像素包括第一像素电路以及与所述第一像素电路连接的第一发光元件，所述第二像素包括第二像素电路以及与所述第二像素电路连接的第二发光元件，所述第一发光元件和所述第二发光元件配置为发出不同颜色的光。
在一些示例中，所述第一像素电路和所述第二像素电路分别包括驱动子电路，所述驱动子电路包括控制端、第一端和第二端；所述第一像素电路的驱动子电路的第一端配置为从所述第一电源端接收所述第一电压，第二端与所述第一发光元件连接，所述第一像素电路的驱动子电路配置为响应于来自所述第一电源电压端的所述第一电压形成流经所述第一发光元件的驱动电流；所述第二像素电路的驱动子电路的第一端配置为从所述第二电源端接收所述第二电压，第二端与所述第二发光元件连接，所述第二像素电路的驱动子电路配置为响应于来自所述第二电源电压端的所述第二电压形成流经所述第二发光元件的驱动电流。
在一些示例中，所述显示装置还包括第一电源线和第二电源线，所述第一电源线将所述第一电源电压端与所述第一像素电路的驱动子电路的第一端电连接，所述第二电源线将所述第二电源电压端与所述第二像素电路的驱动子电路的第一端电连接；所述第一电源线和所述第二电源线绝缘。
本公开至少一实施例还提供一种电源电压控制方法，用于为显示面板提供电源电压，所述显示面板包括多个像素，所述多个像素包括第一像素和第二像素，所述第一像素和所述第二像素为不同颜色的像素，所述方法包括： 分别在第一时间和第二时间向所述第一像素提供第一电压，以及向所述第二像素提供第二电压；在所述第一时间，所述第一电压和所述第二电压不同；在所述第二时间，所述第一电压和所述第二电压相同。
在一些示例中，所述方法包括：判断所述显示面板的当前帧的显示画面是否为风险画面，在所述当前帧的显示画面为风险画面时，所述第一时间在所述当前帧内。
在一些示例中，判断所述显示面板的当前帧的显示画面是否为所述风险画面包括：获取所述显示面板的当前帧的显示画面的第一灰阶值和上一帧的显示画面的第二灰阶值；根据所述第一灰阶值和所述第二灰阶值判断所述当前帧的显示画面是否为所述风险画面。
在一些示例中，所述多个像素被划分成n个显示单元，根据所述第一灰阶值和所述第二灰阶值判断所述当前帧的显示画面是否为所述风险画面包括：计算所述n个显示单元分别在所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的差值；当所述n个显示单元的当前帧的显示画面的第一灰阶值与所述上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值n*k时，判断所述当前帧的显示画面为所述风险画面，n为大于1万的整数，0<k≤1。
在一些示例中，k大于等于75％。
附图说明
为了更清楚地说明本发明实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例，而非对本发明的限制。
图1是一种像素阵列的驱动电路的结构示意图；
图2是一种RGB像素的启动亮度-时间曲线图；
图3是一种RGB像素的启动电流-时间曲线图；
图4A是本公开一个实施例的电压控制电路的结构示意图；
图4B是本公开至少一实施例提供的显示装置的结构示意图；
图5是本公开另一个实施例的电压控制电路的结构示意图；
图6是本公开一个示例的各像素的驱动电压的曲线图；
图7是本公开一个示例的基本像素架构的结构示意图；
图8是本公开一个示例的RGB像素的启动电流-时间曲线图；
图9是本公开一个示例的RGB像素的启动亮度-时间曲线图；
图10是本公开实施例的显示面板的结构框图；
图11是本公开实施例的显示装置的结构框图；
图12是本公开实施例的电源电压控制方法的流程图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
发明人发现，在现有的OLED产品中，由于发光(Electro-Luminescent，简称EL)材料电学特性，不同颜色的EL材料(如红光(R)发光材料、绿光(G)发光材料、蓝光(B)发光材料)的启动阈值电压各不相同，对启动电流的响应速度也不同，导致画面显示质量降低。例如，在拖动显示画面(例如静态显示画面)或者显示画面刷新频率较高(例如高于120HZ)等情况下，当显示画面(例如局部画面)由低灰阶向高灰阶转变且相邻帧显示画面(例 如局部画面)的灰阶差异过大(例如大于20个灰阶)的情形，画面的亮暗交接边缘会出现残留混色拖影现象，降低显示质量。例如，在前一帧显示画面亮度较低时(例如低于50尼特)该现象尤为明显。
通常，在显示技术领域，对像素阵列进行驱动时，一般都采用同一驱动电压ELVDD驱动所有的像素(如R、G、B像素)，如图1所示。例如，位于同一行的不同颜色的像素均连接至同一电源线ELVDD以接收相同的驱动电压ELVDD。在该驱动电压ELVDD的作用下，启动亮度-时间曲线和启动电流-时间曲线的一种示例分别如图2、图3所示。
在显示画面进行切换时，例如由低灰阶显示画面向高灰阶显示画面进行切换时，各像素在到达稳定亮度以获得稳定的显示画面前要经历一个起亮阶段，例如该起亮阶段的时长为几帧(例如为4帧)的时长。例如，从图2、图3中可以看出，在该起亮阶段，红(R)、绿(G)、蓝(B)三种颜色的发光材料对于启动电流的响应时间(开启时间)和响应速度均不同，蓝色发光材料最先发光但亮度增长最慢，红色发光材料发光较快同时亮度增长较高，而绿色发光材料发光最晚但亮度增长最快。虽然流过不同颜色发光材料的电流相同，但是该电流在不同颜色发光材料中引起的亮度的变化速度存在差异，从而导致在到达画面稳定阶段之前的起亮阶段出现拖影现象。该技术中，像素阵列中的像素充电完成后，触发信号同时开启，对于各EL材料的电流响应特性无法区别控制，在低亮度下，R、B、G像素启动速度差异会导致亮暗交接边缘出现混色拖影，画面品质低。为此，本公开提出了一种电压控制电路及电源电压控制方法、显示装置。
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
下面参考附图描述本公开实施例的电压控制电路、电源电压控制方法及显示装置。
图4A是根据本公开的一个实施例的电压控制电路的结构示意图，图4B是本公开实施例提供的一种显示装置的结构示意图。
如图4A和图4B所示，该电压控制电路203用于与显示面板20连接以 提供电源电压ELVDD。该显示面板包括多个像素100，该多个像素包括红像素、绿像素和蓝像素。
该多个像素包括第一像素101和第二像素102，第一像素101和第二像素102为不同颜色的像素。该电压控制电路203用于分别在第一时间t1和第二时间t2向第一像素101提供第一电压ELVDD1、以及向第二像素102提供第二电压ELVDD2；在第一时间t1，该第一电压和该第二电压不同；在第二时间t2，该第一电压和该第二电压相同。例如，该第一像素101可以是红色像素，第二像素102可以是绿色像素或蓝色像素。
考虑到该第一像素和第二像素的发光材料在起亮阶段对电流的响应特性不同，该电压控制电路203通过在该起亮阶段向该第一像素和第二像素分别输出不同的电源电压，降低第一像素和第二像素的起亮速度的差异，也即相同电流下、单位时间内亮度的变化差异降低，从而缓解了拖影现象。例如，该起亮阶段的第一电压和第二电压可以根据图2所示的不同颜色的发光材料对于启动电流的响应特性来调节。后文将对此进行详细描述。
如图4B所示，该显示装置30包括显示面板20和该电压控制电路203，该电压控制电路203与该显示面板20电连接以为像素电路提供电源电压ELVDD。
如图4B所示，该显示面板20包括显示区110和显示区110外的非显示区103。例如，非显示区103位于显示区110的外围区域。该显示面板20包括位于显示区110中的多个像素100。例如，该多个像素沿第一方向D1和第二方向D2排成阵列，该第一方向D1和第二方向D2不同，例如二者正交。例如，子像素可以按照传统的RGB的方式或者子像素共享的方式(例如pentile)构成像素单元以实现全彩显示，本公开对子像素的排列方式及其实现全彩显示的方式不作限制。
该显示面板20还包括位于显示区110中的多条扫描线11和多条数据线12，该多条扫描线11和多条数据线12彼此交叉在显示区110中定义出多个像素区，每个像素区中对应设置一个像素100。例如，该扫描线11沿第一方向D1延伸，该数据线12沿第二方向D2延伸。
每个像素100包括像素电路和发光元件，该像素电路用于驱动该发光元件发光。该像素电路例如为常规的像素电路，例如为2T1C(即两个晶体管 和一个电容)像素电路、4T2C、5T1C、7T1C等nTmC(n、m为正整数)像素电路，并且不同的实施例中，该像素电路还可以进一步包括补偿子电路，该补偿子电路包括内部补偿子电路或外部补偿子电路，补偿子电路可以包括晶体管、电容等。又例如，根据需要，该像素电路还可以进一步包括复位电路、发光控制子电路、检测电路等。例如，该发光元件为有机发光二极管(OLED)。
例如，该显示面板20还可以包括位于非显示区103中的栅极驱动电路13和数据驱动电路14。例如，该栅极驱动电路13可以通过扫描线11与像素电路连接以为像素提供各种扫描信号或控制信号；该数据驱动电路14可以通过数据线12与像素电路连接以提供数据信号。
例如，该显示面板20还包括多条电源线以为各像素的像素电路提供电源电压。如图4B所示，该显示面板20包括第一电源线201和第二电源线202，第一电源线201与第一像素101连接以向第一像素101提供第一电压ELVDD1，第二电源线202与第二像素102连接以向第二像素102提供第二电压ELVDD2。例如，该第一电源线201和第二电源线202均沿第一方向D1延伸且彼此绝缘。
例如，该非显示区103中设置有邦定区130，该邦定区设置有多个邦定电极或信号端子，该邦定电极通过走线与显示基板20中的电路(例如栅极驱动电路13)或电源线连接，并用于与外部电路(例如IC芯片)邦定，从而为显示基板中的电路或信号线提供电信号(例如时钟信号、电源电压信号等)。例如，如图4B所示，第一电源线201、第二电源线202分别通过位于非显示区103中的走线135与位于邦定区130的第一电源电压端131、第二电源电压端132电连接。例如，该走线135为环状，围绕该显示区110设置。
例如，该电压控制电路203通过邦定(bonding)的方式与显示面板20连接。例如，该电压控制电路203安装在柔性电路板(FPC，未示出)上，并通过该柔性电路板与显示面板20邦定连接。在另一些示例中，该电压控制电路203也可以直接集成在显示面板20中。本公开实施例对于电压控制电路203与显示面板20的连接方式不作限制。
例如，显示面板20还可以包括控制电路(未示出)。例如，该控制电路配置为控制数据驱动电路14施加该数据信号，以及控制栅极驱动电路13施 加该扫描信号或控制信号。该控制电路的一个示例为时序控制电路(T-con)。控制电路可以为各种形式，例如包括处理器和存储器，存储器包括可执行代码，处理器运行该可执行代码以执行上述电源电压控制方法。
例如，处理器可以是中央处理单元(CPU)或者具有数据处理能力和/或指令执行能力的其它形式的处理装置，例如可以包括微处理器、可编程逻辑控制器(PLC)等。
例如，存储装置可以包括一个或多个计算机程序产品，所述计算机程序产品可以包括各种形式的计算机可读存储介质，例如易失性存储器和/或非易失性存储器。易失性存储器例如可以包括随机存取存储器(RAM)和/或高速缓冲存储器(cache)等。非易失性存储器例如可以包括只读存储器(ROM)、硬盘、闪存等。在计算机可读存储介质上可以存储一个或多个计算机程序指令，处理器可以运行该程序指令期望的功能。在计算机可读存储介质中还可以存储各种应用程序和各种数据。
该电压控制电路，针对不同的第一像素和第二像素，设置不同的电源线，并通过电压控制电路向各电源线分别施加第一电压和第二电压，以对第一像素和第二像素的电流特性进行区别控制，由此有助于改善显示画面的质量，解决因发光材料的起亮特性不同造成的拖影问题。
在本公开的一个实施例中，电压控制电路203用于判断显示面板的当前帧的显示画面是否为风险画面；以及在该当前帧的显示画面为风险画面时，该第一时间t1在该当前帧内。
例如，在当前帧的显示画面显示之前，该电压控制电路通过对当前帧的显示画面的显示数据进行分析，判断当前帧的显示画面是否存在上述拖影等问题的风险，并在该当前帧的显示画面为风险画面时对输出的第一电压和/或第二电压进行调节，以减少第一像素101与第二像素102在起亮速度上的差距。
例如，该电压控制电路203用于获取该显示面板的当前帧的显示画面的第一灰阶值和上一帧显示画面的第二灰阶值，并根据该第一灰阶值和第二灰阶值判断该当前帧的显示画面是否为风险画面。
例如，可将多个像素分割成多个显示单元(如n个显示单元记为D1～Dn)，电压控制电路203用于：分别计算该n个显示单元的当前帧的显示画面的第 一灰阶值GL1与上一帧的显示画面的第二灰阶值GL2之间的n个差值；在计算出的n个差值中大于预设差值的差值个数大于第一预设值时，判断当前帧的显示画面为风险画面。
举例而言，先对像素阵列对应的显示画面进行分析处理，将当前帧记为P2，上一帧记为P1，并将显示画面按照做单元分割，将多个像素划分为n个显示单元，例如每个显示单元包括25(5*5)个像素或者100(10*10)个像素，该n个显示单元分别记为D1～Dn。分别获取P1和P2中n个显示单元的第一灰阶值GL1和第二灰阶值GL2，并分别计算P1、P2中对应的显示单元的灰阶值的差值(GL2-GL1)，即分别计算P1中显示单元D1的灰阶值与P2中显示单元D1的灰阶值的差值，P1中显示单元D2的灰阶值与P2中显示单元D2的灰阶值的差值，…，P1中显示单元Dn的灰阶值与P2中显示单元Dn的灰阶值的差值，共计n个差值；判断n个差值中大于预设灰阶差值(例如最大灰阶值为255，该预设灰阶差值为20)的个数是否大于预设值如n*k(即灰阶差异变化大)；如果是，则表明灰阶差异大的显示单元的占比过多，对显示画面的质量造成的影响较大，即判断P1为风险画面，此时需要对第一电压ELVDD1和/或第二电压ELVDD2进行调整，例如可根据第一像素101和第二像素102的发光材料特性，在显示阶段对第一电压ELVDD1或第二电压ELVDD2做区分亚像素的电压拉高，以便实现在对各像素的驱动电流的Over Drive(即增速驱动)，减少第一像素101与第二像素102在起亮时间和起亮亮度上的差距，即使得第一像素101与第二像素102快速达到同样亮度水平。例如，n为大于1万的整数，例如为5万到30万之间，例如为10万到18万之间。例如，k为大于0小于等于1的常数，其值可根据需要设置，例如k大于等于75％。
在另一些示例中，例如，该电压控制电路203还配置为获取该显示面板的当前帧的显示画面的第一灰阶值和上一帧显示画面的第二灰阶值以及该显示面板的上一帧显示画面的亮度值，根据该第一灰阶值、该第二灰阶值和该亮度值判断所述当前帧的显示画面是否为风险画面。
例如，该电压控制电路203用于计算所述多个显示单元分别在所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的差值；当所述上一帧的显示画面的亮度值小于预设亮度值，且所述n个显示 单元的当前帧的显示画面的第一灰阶值与在上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值时，判断所述当前帧的显示画面为所述风险画面。例如，该预设亮度值为50尼特。
该实施例与上一实施例的区别在于在判断当前画面是否为风险画面时还考虑了上一帧显示画面的亮度。由于拖影现象在上一帧显示画面亮度较低的情形下表现得较为明显，该示例通过考虑将前一帧显示画面的亮度纳入考虑并对当前帧的显示画面的风险进行判断，提高了该电压控制电路对显示画面的改善效率和效果。在本公开的一个实施例中，如图5和图4B所示，该多个子像素还可包括第三像素103，第一像素101、第二像素102和第三像素103分别为不同颜色的像素。该电压控制电路203还用于分别在第一时间和第二时间向第三像素提供第三电压ELVDD3。该显示面板20还可以包括第三电源线204，第三电源线204用于将第三电源电压端133与该第三像素103连接以向第三像素103提供第三电压ELVDD3。
在该实施例中，如图5所示，电压控制电路203还与第三电源线203相连，以向第三电源线204输出第三电压ELVDD3。电压控制电路203可在判断当前帧的显示画面是为风险画面时，调节第一电压ELVDD1、第二电压ELVDD2、第三电压ELVDD3中的至少一个，以减少第一像素101、第二像素102和第三像素103在起亮速度上的差距。
例如，在所述第一时间，所述第一电压、所述第二电压和所述第三电压均不相同；在所述第二时间，所述第一电压、所述第二电压和所述第三电压相同。
例如，第一像素101可为红色像素，第二像素102可为绿色像素，第三像素103可为蓝色像素。
图6示出了本公开实施例提供的一种电压控制电路输出的第一电压、第二电压和第三点电压的波形示意图。如图6所示，在第一时间t1,三种颜色像素接收的电源电压ELVDD均不相同；在第二时间t2，三种颜色像素接收的电源电压ELVDD均相同，为参考电压V0。
例如，第一时间t1位于该显示面板的起亮阶段，第二时间t2位于该起亮阶段后的稳定阶段。在该起亮阶段，该电压控制电路通过对第一像素、第二像素和第三像素分别提供电源电压，降低第一像素、第二像素及第三像素 的起亮速度的差异，也即相同电流下、单位时间内亮度的变化差异降低，从而缓解拖影现象。例如，在该稳定阶段，第一电压和第二电压均为参考电压V0。
例如，基于图2所示的亮度特性曲线，参见图6，在驱动像素阵列起亮时，第一电压ELVDD1可小于第三电压ELVDD3，第三电压ELVDD3可小于所述第二电压ELVDD2。为便于理解，下面基于图5所示的示例，并结合图6-图9说明本公开实施例的电压控制电路的工作原理。
例如，每个像素的像素电路包括驱动子电路，该驱动子电路包括控制端、第一端和第二端，该驱动子电路配置为响应于来自电源电压端的电源电压形成流经发光元件的电流。
例如，第一像素包括第一像素电路和第一发光元件，第二像素包括第二像素电路和第二发光元件，第一像素电路的驱动子电路的第一端配置为从第一电源端131接收该第一电压，第二端与该第一发光元件连接，第一像素电路的驱动子电路配置为响应于来自该第一电源电压端131的第一电压ELVDD1形成流经该第一发光元件的驱动电流。第二像素电路的驱动子电路的第一端配置为从该第二电源端132接收该第二电压，第二端与该第二发光元件连接，该第二像素电路的驱动子电路配置为响应于来自第二电源电压端132的该第二电压ELVDD2形成流经该第二发光元件的驱动电流。
例如，该驱动子电路包括驱动晶体管，驱动晶体管的栅极、第一极和第二极分别作为该驱动子电路的控制端、第一端和第二端。例如，该驱动晶体管均可以为薄膜晶体管或场效应晶体管或其他特性相同的开关器件。这里采用的晶体管的源极、漏极在结构上可以是对称的，所以其源极、漏极在结构上可以是没有区别的。在本公开的实施例中，为了区分晶体管除栅极之外的两极，直接描述了其中一极为第一极，另一极为第二极。
例如，该驱动晶体管可以直接与电源电压端电连接，也可以与该电源电压端之间连接有第一发光控制晶体管；该驱动晶体管可以直接与发光元件电连接，也可以与该发光元件直接连接第二发光控制晶体管。以下将以驱动晶体管的第一端和第二端分别直接与电源电压端和发光元件电连接为例进行说明。
如图7所示的基本像素架构包括驱动晶体管Q1、存储电容C1和发光元 件D1，驱动晶体管Q1的沟道打开的程度会控制流过发光二极管D1的电流I1，同时驱动电压ELVDD和N1点(驱动晶体管的栅极节点)的电压差可以控制驱动晶体管Q1沟道的开启程度。在保证N1点正常显示像素电压不变的前提下，通过沟道开启瞬间(即起亮阶段)拉高ELVDD电压的方式，可以瞬间改变流过D1的电流，由此，可以控制不同颜色子像素的起亮亮度，同时又不影响常规状态下的显示亮度。
例如，从图2所示的亮度特性曲线可以看出，蓝色像素虽然会起亮快，但是亮度会很低，而绿色像素起亮点很晚，但是亮度爬升会很快，只有红色像素是起亮也快亮度也高，所以会有红色拖影。例如，由于红色较绿色或蓝色在视觉上显得更亮更突兀，基于此，可以通过拉快绿色像素和蓝色像素的起亮点去补偿，维持红色像素的起亮点不变，如图6所示，在起亮阶段，第二电压和第三电压被拉高，第一电压保持为参考电压V0。此时，对应图6所示的驱动电压，各像素对应的启动电流-时间曲线如图8所示，启动亮度-时间曲线如图9所示。从图8和图9中可以看出，通过拉高第二电压和第三电压，提高了流经绿色发光元件和蓝色发光元件的电流，降低了在起亮阶段三种颜色的像素在起亮素的上的差异，从而有效缓解了拖影现象。
如图6和图9所示，各像素经历上述起亮，以相近的起亮速度到达各自的稳定的发光亮度，画面进入稳定阶段。此时，第二电压和第三电压重新回到参考电压V0，各像素的发光电流与亮度由驱动晶体管栅极节点N1写入的数据电压决定，而避免了电源电压ELVDD的差异导致画面失真。
当然，关于各电源电压的调整对策，可以根据OLED的器件特性去设定，并不限于上述提到的器件特性。
综上所示，本公开实施例的电压控制电路，针对不同的像素阵列中不同的像素，可设置不同的电源线以分别施加不同的驱动电压，以对各像素的电流特性进行区别控制，由此能够减少各像素在起亮时间和起亮亮度上的差距，改善显示画面的质量，解决因发光材料的起亮特性不同造成的拖影问题。
图10是本公开另一实施例的显示面板的结构框图。
如图10所示，该显示面板300包括上述实施例的电压控制电路203。
本公开实施例的显示面板，通过上述的电压控制电路，能够减少各像素在起亮时间和起亮亮度上的差距，改善显示画面的质量，解决因发光材料的 起亮特性不同造成的拖影问题。
图11是本公开另一实施例的显示装置的结构框图。
如图11所示，该显示装置400包括壳体500和上述实施例的显示面板300。
在该实施例中，显示装置400可以是LCD(Liquid Crystal Display，液晶显示器)屏，也可以是OLED(Organic Light-Emitting Diode,有机发光二极管)屏。
本公开实施例的显示装置，采用上述的显示面板，能够减少各像素在起亮时间和起亮亮度上的差距，改善显示画面的质量，解决因发光材料的起亮特性不同造成的拖影问题。
本公开至少一实施例还提供一种电源电压控制方法，用于给显示面板提供电源电压并适用于上述任一电压控制电路及显示面板。该方法包括：分别在第一时间和第二时间向该第一像素提供该第一电压，以及向该第二像素提供第二电压；在该第一时间，该第一电压和该第二电压不同；在该第二时间，该第一电压和该第二电压相同。
例如，该方法还包括：判断显示面板的当前帧的显示画面是否为风险画面，在所述当前帧的显示画面为风险画面时，所述第一时间在所述当前帧内。
图12是本公开一实施例的电源电压控制方法的流程图。
如图12所示，该方法包括以下步骤：
S101，判断显示面板的当前帧的显示画面是否为风险画面；
S102，在所述当前帧的显示画面为风险画面时，在第一时间向该第一像素提供该第一电压，以及向该第二像素提供第二电压，该第一电压和第二电压不同，且向该第一时间在该当前帧内。
例如，可通过查表的方式确定每个类别的像素所需要的驱动电压。
例如，像素阵列中不同像素的EL材料不同，而不同EL材料的电学特性也有所差异，由此到时各像素的起亮电压和起亮时间也有差异。为此可根据获取到的各像素的类别确定每个类别的像素的驱动电压，进而分别向每个类别的像素提供相应的驱动电压。由此，通过对各像素进行区别控制，有助于改善显示画面质量，解决因发光材料的起亮特性不同造成的拖影问题。
例如，判断所述显示面板的当前帧的显示画面是否为所述风险画面包括： 获取所述显示面板的当前帧的显示画面的第一灰阶值和上一帧的显示画面的第二灰阶值；根据所述第一灰阶值和所述第二会介质判断所述当前帧的显示画面是否为所述风险画面。
例如，显示面板中的多个像素被划分成n个显示单元，根据所述第一灰阶值和第二灰阶值判断所述当前帧的显示画面是否为风险画面包括：计算所述n个显示单元分别在所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的n个差值；当所述n个显示单元的所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值n*k时，判断所述当前帧的显示画面为所述风险画面，0<k≤1。例如，k大于等于75％。
需要说明的是，上述对电压控制电路实施方式的陈述也适用于本公开实施例的电源电压控制方法，此处不再赘述。
本公开实施例的电源电压控制方法，通过对各像素进行区别控制，能够减少各像素在起亮时间和起亮亮度上的差距，改善显示画面的质量，解决因发光材料的起亮特性不同造成的拖影问题。
需要说明的是，在流程图中表示或在此以其他方式描述的逻辑和/或步骤，例如，可以被认为是用于实现逻辑功能的可执行指令的定序列表，可以具体实现在任何计算机可读介质中，以供指令执行系统、装置或设备(如基于计算机的系统、包括处理器的系统或其他可以从指令执行系统、装置或设备取指令并执行指令的系统)使用，或结合这些指令执行系统、装置或设备而使用。就本说明书而言，“计算机可读介质”可以是任何可以包含、存储、通信、传播或传输程序以供指令执行系统、装置或设备或结合这些指令执行系统、装置或设备而使用的装置。计算机可读介质的更具体的示例(非穷尽性列表)包括以下：具有一个或多个布线的电连接部(电子装置)，便携式计算机盘盒(磁装置)，随机存取存储器(RAM)，只读存储器(ROM)，可擦除可编辑只读存储器(EPROM或闪速存储器)，光纤装置，以及便携式光盘只读存储器(CDROM)。另外，计算机可读介质甚至可以是可在其上打印所述程序的纸或其他合适的介质，因为可以例如通过对纸或其他介质进行光学扫描，接着进行编辑、解译或必要时以其他合适方式进行处理来以电子方式获得所述程序，然后将其存储在计算机存储器中。
应当理解，本公开的电压控制电路可以用硬件、软件、固件或它们的组合来实现。在上述实施方式中，多个步骤或方法可以用存储在存储器中且由合适的指令执行系统执行的软件或固件来实现。例如，如果用硬件来实现，和在另一实施方式中一样，可用本领域公知的下列技术中的任一项或他们的组合来实现：具有用于对数据信号实现逻辑功能的逻辑门电路的离散逻辑电路，具有合适的组合逻辑门电路的专用集成电路，可编程门阵列(PGA)，现场可编程门阵列(FPGA)等。
以上所述仅是本发明的示范性实施方式，而非用于限制本发明的保护范围，本发明的保护范围由所附的权利要求确定。

Claims (20)

  1. 一种电压控制电路，用于与显示面板连接，所述显示面板包括多个像素，所述多个像素包括第一像素和第二像素，所述第一像素和所述第二像素为不同颜色的像素，
    其中，所述电压控制电路配置为分别在第一时间和第二时间向所述第一像素提供第一电压以及向所述第二像素提供第二电压；
    在所述第一时间，所述第一电压和所述第二电压不同；在所述第二时间，所述第一电压和所述第二电压相同。
  2. 如权利要求1所述的电压控制电路，其中，所述电压控制电路还配置为：
    判断所述显示面板的当前帧的显示画面是否为风险画面，
    其中，在所述当前帧的显示画面为风险画面时，所述第一时间在所述当前帧内。
  3. 如权利要求2所述的电压控制电路，还配置为：
    获取所述显示面板的所述当前帧的显示画面的第一灰阶值和上一帧的显示画面的第二灰阶值；
    根据所述第一灰阶值和所述第二灰阶值判断所述当前帧的显示画面是否为风险画面。
  4. 如权利要求3所述的电压控制电路，其中，所述多个像素被划分成n个显示单元，所述电压控制电路还配置为：
    计算所述n个显示单元在当所述前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的n个差值；
    当所述n个显示单元的当前帧的显示画面的第一灰阶值与所述上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值n*k时，判断所述当前帧的显示画面为所述风险画面，n为大于1万的整数，0<k≤1。
  5. 如权利要求4所述的电压控制电路，其中，k大于等于75％。
  6. 如权利要求3所述的电压控制电路，其中，所述电压控制电路还配置 为：
    获取所述显示面板的所述当前帧的显示画面的第一灰阶值和所述上一帧的显示画面的第二灰阶值和获取所述显示面板的所述上一帧的显示画面的亮度值，根据所述第一灰阶值、所述第二灰阶值和所述亮度值判断所述当前帧的显示画面是否为所述风险画面。
  7. 如权利要求6所述的电压控制电路，其中，所述电压控制电路还配置为：
    计算所述n个显示单元分别在所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的n个差值；
    当所述上一帧的显示画面的亮度值小于预设亮度值，且所述n个显示单元的当前帧的显示画面的第一灰阶值与在上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值时，判断所述当前帧的显示画面为所述风险画面。
  8. 如权利要求2-7任一项所述的电压控制电路，其中，所述多个像素还包括第三像素，所述第一像素、所述第二像素和所述第三像素分别为不同颜色的像素；
    所述电压控制电路还配置为在所述第一时间和所述第二时间分别向所述第三像素提供第三电压；
    在所述第一时间，所述第一电压、所述第二电压和所述第三电压均不相同；在所述第二时间，所述第一电压、所述第二电压和所述第三电压相同。
  9. 如权利要求8所述的电压控制电路，其中，所述电压控制电路还配置为：在所述当前帧的显示画面为所述风险画面时，在所述第一时间分别向所述第一像素、所述第二像素和所述第三像素提供所述第一电压、所述第二电压和所述第三电压。
  10. 如权利要求9所述的电压控制电路，其中，所述第一像素为红色像素，所述第二像素为绿色像素，所述第三像素为蓝色像素，
    在所述第一时间，所述第一电压小于所述第三电压，所述第三电压小于所述第二电压。
  11. 如权利要求10所述的电压控制电路，其中，所述电压控制电路还配 置为：
    在所述当前帧的显示画面为所述风险画面时，拉高所述第二电压和所述第三电压，并保持所述第一电压不变。
  12. 一种显示装置，包括如权利要求1-11任一所述的电压控制电路和所述显示面板，
    其中，所述显示面板包括第一电源电压端和第二电源电压端，所述第一像素与所述第一电源电压端连接以接收所述第一电压，所述第二像素与所述第二电源电压端连接以接收所述第二电压；
    所述电压控制电路分别与所述第一电源电压端和所述第二电源电压端连接以提供所述第一电压和所述第二电压。
  13. 如权利要求12所述的显示装置，其中，所述第一像素包括第一像素电路以及与所述第一像素电路连接的第一发光元件，所述第二像素包括第二像素电路以及与所述第二像素电路连接的第二发光元件，所述第一发光元件和所述第二发光元件配置为发出不同颜色的光。
  14. 如权利要求13所述的显示装置，其中，所述第一像素电路和所述第二像素电路分别包括驱动子电路，所述驱动子电路包括控制端、第一端和第二端；
    所述第一像素电路的驱动子电路的第一端配置为从所述第一电源端接收所述第一电压，第二端与所述第一发光元件连接，所述第一像素电路的驱动子电路配置为响应于来自所述第一电源电压端的所述第一电压形成流经所述第一发光元件的驱动电流；
    所述第二像素电路的驱动子电路的第一端配置为从所述第二电源端接收所述第二电压，第二端与所述第二发光元件连接，所述第二像素电路的驱动子电路配置为响应于来自所述第二电源电压端的所述第二电压形成流经所述第二发光元件的驱动电流。
  15. 如权利要求12-14任一所述的显示装置，还包括第一电源线和第二电源线，
    其中，所述第一电源线将所述第一电源电压端与所述第一像素电路的驱动子电路的第一端电连接，所述第二电源线将所述第二电源电压端与所述第 二像素电路的驱动子电路的第一端电连接；
    所述第一电源线和所述第二电源线绝缘。
  16. 一种电源电压控制方法，用于为显示面板提供电源电压，所述显示面板包括多个像素，所述多个像素包括第一像素和第二像素，所述第一像素和所述第二像素为不同颜色的像素，
    所述方法包括：
    分别在第一时间和第二时间向所述第一像素提供第一电压，以及向所述第二像素提供第二电压；
    在所述第一时间，所述第一电压和所述第二电压不同；在所述第二时间，所述第一电压和所述第二电压相同。
  17. 如权利要求16所述的方法，还包括：
    判断所述显示面板的当前帧的显示画面是否为风险画面，
    其中，在所述当前帧的显示画面为风险画面时，所述第一时间在所述当前帧内。
  18. 如权利要求17所述的方法，其中，判断所述显示面板的当前帧的显示画面是否为所述风险画面包括：
    获取所述显示面板的当前帧的显示画面的第一灰阶值和上一帧的显示画面的第二灰阶值；
    根据所述第一灰阶值和所述第二灰阶值判断所述当前帧的显示画面是否为所述风险画面。
  19. 如权利要求18所述的方法，其中，所述多个像素被划分成n个显示单元，
    根据所述第一灰阶值和所述第二灰阶值判断所述当前帧的显示画面是否为所述风险画面包括：
    计算所述n个显示单元分别在所述当前帧的显示画面的第一灰阶值与在所述上一帧的显示画面的第二灰阶值之间的差值；
    当所述n个显示单元的当前帧的显示画面的第一灰阶值与所述上一帧的显示画面的第二灰阶值之间的n个差值中大于预设差值的个数大于预设值n*k时，判断所述当前帧的显示画面为所述风险画面，n为大于1万的整数， 0<k≤1。
  20. 如权利要求19所述的方法，其中，k大于等于75％。
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