WO2022057294A1 - 亮度调节方法、装置及显示设备 - Google Patents

亮度调节方法、装置及显示设备 Download PDF

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Publication number
WO2022057294A1
WO2022057294A1 PCT/CN2021/094429 CN2021094429W WO2022057294A1 WO 2022057294 A1 WO2022057294 A1 WO 2022057294A1 CN 2021094429 W CN2021094429 W CN 2021094429W WO 2022057294 A1 WO2022057294 A1 WO 2022057294A1
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Prior art keywords
light
control signal
pulse
pulse period
brightness
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PCT/CN2021/094429
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English (en)
French (fr)
Inventor
刘阿强
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北京集创北方科技股份有限公司
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Priority to US18/026,578 priority Critical patent/US12002433B2/en
Publication of WO2022057294A1 publication Critical patent/WO2022057294A1/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
    • G09G3/34—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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • 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
    • G09G3/34—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
    • G09G3/3406—Control of illumination source
    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G09G3/2096—Details of the interface to the display terminal specific for a flat panel
    • 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
    • G09G3/34—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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00—Aspects of interface with display user
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to the field of display technology, and in particular to a brightness adjustment method, device and display device.
  • Light Emitting Diode is a solid-state semiconductor device that can directly convert electrical energy into light energy.
  • LED has gradually replaced the traditional cold cathode fluorescent lamp CCFL (Cold Cathode Fluorescent Lamp) as the backlight source of LCD.
  • CCFL Cold Cathode Fluorescent Lamp
  • the backlight source is generally dimmed by controlling the backlight driver, so as to achieve the adjustment of the brightness of the LCD.
  • Pulse Width Modulation Pulse Width Modulation, referred to as PWM for short
  • PWM Pulse Width Modulation
  • waveform controls the LED driver for dimming. Controlling the LED driver for dimming through the PWM waveform is to make the LED driver periodically output current to the LED backlight, so that the LED backlight can be turned on and off periodically. Once the frequency of turning on and off exceeds 100Hz, what the human eye sees is the average brightness, not the LED light source being turned on and off.
  • changing the duty cycle of the PWM waveform input to the LED driver can adjust the time ratio of the LED backlight on and off in a PWM waveform cycle, so as to achieve the effect of adjusting the brightness of the LCD.
  • the higher the low-level time in the lighting control signal the higher the brightness of the display, and the less the low-level time, the lower the brightness of the display.
  • usually several pulse periods are designed in a light-emitting control signal. In each pulse period, the low level represents the pixel of this row. When the light is on, the high level means that the pixels in this row do not emit light. Therefore, the higher the duty cycle of the low level in the light-emitting control signal, the longer the light-emitting time, and the higher the brightness of the corresponding display.
  • a brightness adjustment module (Brightness Controller, BC module for short) is usually used to control the low-level width of the luminescence control signal (EM signal) to adjust the screen brightness.
  • the display brightness value (DBV) of the display panel changes, the required EM low-level width (or duty cycle) is calculated through the BC module, and then the on-time of the LED is changed to adjust the screen brightness.
  • the low-level width of the EM signal changes with the line precision
  • N and n are large, the precision of EM in adjusting the screen brightness will be very low, which will lead to the phenomenon that the brightness jumps too large when the display adjusts the brightness bar, which affects the user experience.
  • the present invention provides a brightness adjustment method, device and display device, which can effectively improve the backlight brightness adjustment precision of the display panel and have a larger adjustable range for the backlight brightness of the display panel.
  • the brightness adjustment method includes: acquiring a brightness adjustment instruction and a target display brightness value of the display panel, the display brightness value being used to represent the backlight brightness of the display panel ; adjust the duty cycle of the light-emitting control signal based on the target display brightness value of the display panel; drive the light-emitting diodes in the corresponding rows of the backlight to emit light by the adjusted light-emitting control signal, wherein, the display
  • the light-emitting control signal corresponding to each row of light-emitting diodes in the panel backlight includes N pulse periods; and whenever the duty cycle of the light-emitting control signal needs to be adjusted, select the one of the N pulse periods of the light-emitting control signal.
  • the duty cycle of part of the pulse period is adjusted accordingly, where N is a positive integer greater than 2.
  • selecting the duty ratio of some pulse periods in the N pulse periods of the light-emitting control signal to adjust accordingly includes: selecting an odd-numbered pulse period or an even-numbered pulse period in the N pulse periods of the light-emitting control signal. The duty cycle of each pulse period is adjusted accordingly.
  • selecting the duty cycle of some pulse periods in the N pulse periods of the light-emitting control signal for corresponding adjustment includes: selecting the i-th pulse period to the k-th pulse period in the N pulse periods of the light-emitting control signal.
  • the duty cycle of each pulse period is adjusted accordingly, where i is a positive integer greater than or equal to 1, k is a positive integer greater than i and less than or equal to N, where ki is less than N-1.
  • selecting the duty ratios of some pulse periods in the N pulse periods of the light-emitting control signal for corresponding adjustment includes: selecting the duty ratios in the N pulse periods of the light-emitting control signal to be smaller than the first threshold or greater than the first threshold.
  • the duty cycle of the pulse period of the second threshold is adjusted accordingly, wherein the method for setting the first threshold includes: sorting the duty cycles of the N pulse periods in descending order, and selecting one of the The duty cycle of the jth pulse period is used as the first threshold; the method for setting the second threshold includes: sorting the duty cycles of the N pulse periods in ascending order, and The duty cycle of the jth pulse period is selected as the second threshold, where j is a positive integer smaller than N-1.
  • selecting the duty ratios of some of the pulse periods in the N pulse periods of the light-emitting control signal for corresponding adjustment includes: randomly selecting the duty ratios of some of the pulse periods in the N pulse periods of the light-emitting control signal. Make corresponding adjustments.
  • the partial pulse periods required to be adjusted correspondingly by the light-emitting diodes of adjacent rows in the backlight source are the odd-numbered pulse period or the even-numbered pulse period;
  • the partial pulse period that needs to be adjusted correspondingly in one row of the light-emitting diodes is the odd-numbered pulse period, and the partial pulse period that needs to be adjusted correspondingly in the other row is the even-numbered pulse period.
  • the partial pulse periods required to be adjusted correspondingly by the light-emitting diodes of adjacent rows in the backlight source are the i-th pulse period to the k-th pulse period;
  • the part of the pulse period that needs to be adjusted correspondingly in one row of the light-emitting diodes is the i-th pulse period to the k-th pulse period, and the part of the pulse period that needs to be adjusted correspondingly in the other row is the i+m-th pulse period.
  • m is an integer
  • i+m is greater than or equal to 1
  • k+m is less than or equal to N.
  • the adjustment amount of the duty cycle of each pulse period in the partial pulse period correspondingly adjusted is the same.
  • acquiring the brightness adjustment instruction and the target display brightness value of the display panel includes: generating the brightness adjustment instruction according to the user's operation instruction, and taking the display brightness value set by the user as the target display brightness of the display panel. or generating the brightness adjustment instruction according to the brightness change of the ambient light, and generating the target display brightness value of the display panel according to the sensed brightness of the ambient light.
  • the brightness adjustment device can be used to perform the above brightness adjustment method, wherein when the display panel displays each frame of pictures, each row of light-emitting diodes in the backlight of the display panel
  • the received light-emitting control signals all include N pulse periods, and N is a positive integer greater than 2.
  • the device includes: a processor for generating a brightness adjustment instruction and a target display brightness value of the display panel; a timing controller, and the is connected to the processor, receives the brightness adjustment instruction and the target display brightness value, and adjusts the duty ratio of the output light-emitting control signal according to the brightness adjustment instruction and the target display brightness value; the backlight driver is connected to the The controller is connected to receive the adjusted light-emitting control signal to generate a corresponding driving current, and the driving current is used to drive the backlight to emit light, wherein whenever the duty cycle of the light-emitting control signal needs to be adjusted, The duty ratios of some pulse periods in the N pulse periods of the light-emitting control signal are selected for corresponding adjustment.
  • the timing controller includes: a calculation module for calculating the duty cycle of each pulse period in the output light-emitting control signal according to the target display brightness value of the display panel;
  • the calculation unit is connected to generate the light-emitting control signal according to the calculation result of the calculation module.
  • the apparatus further includes: a memory, connected to the processor and the timing controller respectively, for establishing and storing the mapping relationship between the display brightness value and the duty cycle of the corresponding lighting control signal.
  • a display device provided according to the present invention includes: the above-mentioned brightness adjustment device.
  • the present invention discloses a brightness adjustment method, a device and a display device, which adjust the duty cycle of the lighting control signal received by the backlight source of the display panel based on the brightness adjustment instruction and the target display brightness value to achieve
  • the present invention since only the duty ratio of part of the pulse periods in the N pulse periods of the light-emitting control signal is adjusted each time, the number of rows of light-emitting diodes in the backlight that needs to be adjusted remains unchanged.
  • the adjustment amount corresponding to the total brightness of the entire display panel will be correspondingly reduced, effectively improving the display panel.
  • the backlight brightness adjustment precision since the duty ratio of part of the pulse cycles (greater than 1 and less than N) in the N pulse cycles is adjusted each time, compared with only changing the duty cycle of one pulse cycle in one frame, the present invention has no effect on the display panel's duty cycle.
  • the adjustable range of backlight brightness is larger.
  • Taking the odd-numbered pulse period or the even-numbered pulse period as part of the pulse period of the light-emitting control signal to be adjusted ensures the stability of the subsequent driving based on the light-emitting control signal. Repeated jitter changes can effectively suppress electromagnetic interference from the source.
  • Part of the pulse period of the light-emitting control signal to be adjusted is set as a continuous pulse period, which reduces the number of times of repeated adjustment of the duty cycle, and reduces the adjustment difficulty and power consumption.
  • Adjusting the pulse period with a large empty ratio is conducive to maintaining the balance of the N pulse periods of the light-emitting control signal in one frame period, thereby improving the driving quality of the display panel backlight and enhancing the display effect.
  • FIG. 1 shows a schematic structural diagram of a display device provided according to an embodiment of the present disclosure
  • FIG. 2 shows a schematic waveform diagram of a lighting control signal in one frame period provided according to an embodiment of the present disclosure
  • FIG. 3 shows a flowchart of a brightness adjustment method provided according to an embodiment of the present disclosure.
  • FIG. 1 shows a schematic structural diagram of a display device provided according to an embodiment of the present disclosure
  • FIG. 2 shows a schematic waveform diagram of a light-emitting control signal in one frame period provided according to an embodiment of the present disclosure.
  • the display device 100 includes a display panel 1 , a source driver 2 , a gate driver 3 , a backlight 6 , and a brightness adjustment device (brightness adjustment device for short).
  • the display panel 1 includes a plurality of scan lines, a plurality of data lines, and a plurality of pixel units located at the intersection of the two, and each pixel unit includes a thin film transistor and a pixel electrode respectively.
  • the gate electrodes of the thin film transistors of the pixel units located in the same row are connected to the same scan line, and the sources of the thin film transistors of the pixel units located in the same column are connected to the same data line.
  • the display panel further includes a backlight source 6, and the backlight source 6 is provided with a plurality of light emitting diodes arranged in an array, and the plurality of light emitting diodes are used to provide backlight brightness for a plurality of pixel units of the display panel when emitting light.
  • the plurality of light emitting diodes of the backlight source 6 correspond to the plurality of pixel units on the display panel 1 one-to-one.
  • a row of light emitting diodes in the backlight source 6 corresponds to a row of pixel units on the display panel 1 .
  • the source driver 2 is connected to a plurality of data lines for applying gray-scale voltages corresponding to the gray-scale driving signals to the corresponding thin film transistors via the data lines.
  • the gate driver 3 is connected to the plurality of scan lines, and is used for providing gate signals, so as to sequentially scan the plurality of scan lines in each frame period and select the corresponding thin film transistors.
  • the brightness adjusting device is connected to the backlight source 6 and is used for providing a driving current to the backlight source 6 to control the light emission of the backlight source 6 .
  • the brightness adjustment apparatus further includes a processor 7 , a timing controller 4 and a backlight driver 5 .
  • the processor 7 is used for generating a brightness adjustment instruction and a target display brightness value of the display panel according to the user's instruction or sensing the external environment.
  • the processor 7 may, after receiving an operation instruction such as a user's touch control instruction or an information input instruction, analyze the user's instruction to obtain the target of the display panel, such as the user's setting or desired display panel, contained in the user's operation instruction.
  • the brightness value information is displayed and the brightness adjustment instruction is generated, so as to realize the active adjustment of the backlight brightness of the display panel by the user.
  • the processor 7 may also be connected to a light sensor in the display device 100 to receive and analyze the sensing result of the external ambient light by the light sensor, and then generate a light sensor when the light sensor senses a change in the brightness of the external ambient light.
  • the brightness adjustment command is used to analyze the sensing result of the external ambient light by the light sensor to obtain the optimal display brightness value of the display panel under the current external ambient light, that is, the target display brightness value.
  • the timing controller 4 is connected to the processor 7 .
  • the timing controller 4 is also connected to the source driver 2 and the gate driver 3 respectively, so as to provide a plurality of switching signals SW(1, 2, 3, . . . , n) to the source driver 3, and to
  • the gate driver 4 provides a horizontal synchronization signal Vsync, a start signal STV, and a plurality of clock signals CLK(1, 2, 3, . . . , n).
  • the processor 7 scales the image data input from the external data source according to the resolution of the display panel, and provides the image data together with a plurality of synchronization signals to the timing controller 4 .
  • the plurality of synchronization signals include at least a clock enable signal and a data enable signal, and further include a horizontal synchronization signal and a vertical synchronization signal.
  • the timing controller 4 corrects the image data input from the processor 7 using various data processing methods for improving image quality and reducing power consumption, and provides corresponding grayscale driving signals to the source driver 2 .
  • the timing controller 4 is also used to generate timing signals for controlling the timing of the source driver 2 and the gate driver 3 according to a plurality of synchronization signals input from the processor 7 .
  • the timing signals include, for example, a source start pulse and a source sampling pulse for controlling the latching of the data signal of the source driver 2, a polarity control signal for controlling the polarity of the data signal, and a signal for controlling the output period of the data signal. enable signal, etc.
  • the timing signals also include a start pulse signal and a shift clock for controlling the gate signal scanning of the gate driver 3, an enable signal for controlling the output period of the gate signal, and the like.
  • the timing controller 4 is also connected to the backlight driver 5 for providing the backlight driver 5 with a lighting control signal EM with a certain duty ratio (the lighting control signal EM or a pulse width modulation signal).
  • the timing controller 4 When the timing controller 4 receives the brightness adjustment instruction provided by the processor 7 and the target display brightness value of the display panel, it will adjust the duty cycle of the output lighting control signal according to the received brightness adjustment instruction and the target display brightness value of the display panel. , and the backlight driver 5 receives the adjusted lighting control signal provided by the timing controller to generate a corresponding driving current, which is used to drive the backlight 6 to emit light and control the brightness of the backlight 6 .
  • the light-emitting control signal EM received by each row of LEDs in the backlight of the display panel includes N pulse periods, and N is a positive integer greater than 2.
  • N is a positive integer greater than 2.
  • the timing controller 4 further includes: a calculation module 41 and a signal generation module 42 .
  • the calculation module 41 is used for calculating the duty cycle or the low level time of each pulse period of the output light-emitting control signal EM according to the target display brightness value of the display panel 1 .
  • the signal generation module 42 is connected to the calculation unit 41 for generating the final lighting control signal EM according to the calculation result of the calculation module 41 .
  • the brightness adjustment device further includes a memory 8 .
  • the memory 8 is respectively connected with the processor 7 and the timing controller 4, and is used for establishing and storing the mapping relationship between the display brightness value and the duty ratio of the corresponding lighting control signal.
  • the duty cycle of the corresponding light-emitting control signal can be directly searched and read from the memory, thereby eliminating the calculation process.
  • the computing resources of the device are saved, and the adjustment speed can also be improved.
  • the display panel displays one frame of picture within one frame period of the horizontal synchronization signal Vsyncs
  • EM1 represents the lighting control signal before adjustment
  • EM2 represents the lighting control signal after adjustment
  • W1 and W2 Both are used to represent the low level time of each pulse period in the light-emitting control signal, and then used to represent the duty cycle of each pulse period of the light-emitting control signal.
  • W1 and W2 Both are used to represent the low level time of each pulse period in the light-emitting control signal, and then used to represent the duty cycle of each pulse period of the light-emitting control signal.
  • Each pulse period in the light emission control signal EM1 has a first duty cycle.
  • the N pulse periods of the light-emitting control signal EM2 adjusted based on the technical solution disclosed in the present invention, since only part of the pulse period is changed, as shown in FIG. 2, only the duty cycle of the even-numbered pulse period is changed, so that the The odd-numbered pulse periods have a first duty cycle, and the even-numbered pulse periods have a second duty cycle.
  • the purpose of changing the driving current output by the backlight driver 5 can be achieved, thereby adjusting the display panel 1 the purpose of the backlight brightness.
  • the adjustable range of the backlight brightness of the display panel is also larger.
  • the selected light-emitting control signal EM in the N pulse periods of the partial pulse period of the duty cycle includes but is not limited to changing the low level time of the even-numbered pulse period as shown in FIG. 2 , and in other embodiments of the present disclosure, the partial pulse period may also be an odd-numbered pulse period in the N pulse periods pulse periods, or one or more consecutive partial pulse periods among the N pulse periods, or random partial pulse periods, etc., as long as the number of pulse periods changed by each adjustment is greater than 1 and less than N.
  • the position of the pulse period changed every two adjacent times may be the pulse period at the same position, or may be the pulse period at least at different positions, which is not limited in the present invention.
  • the odd-numbered pulse period or the even-numbered pulse period is used as the partial light-emitting control signal pulse period that needs to be adjusted, the stability of the subsequent driving based on the light-emitting control signal can be guaranteed, and due to the light-emitting control The signal undergoes repeated jitter changes in odd-numbered and even-numbered cycles within one frame period, which can effectively suppress electromagnetic interference from the source.
  • part of the pulse period of the light-emitting control signal to be adjusted is set as a continuous pulse period, the number of times of repeated adjustment of the duty cycle can be correspondingly reduced, thereby reducing adjustment difficulty and power consumption.
  • a pulse period with a small duty cycle for adjustment, and when the duty cycle adjustment of the partial pulse period of the light-emitting control signal needs to be reduced.
  • a pulse period with a large duty cycle can be preferably selected for adjustment. In this way, it is beneficial to maintain the balance of N pulse periods of the light-emitting control signal in one frame period, thereby improving the driving quality of the backlight source of the display panel and enhancing the display effect.
  • FIG. 3 shows a flowchart of a brightness adjustment method provided according to an embodiment of the present disclosure.
  • the brightness adjustment method can be applied to the brightness adjustment apparatus and the display device as shown in FIG. 1 and FIG. 2 .
  • the brightness adjustment method includes performing steps S1 to S3.
  • step S1 the brightness adjustment instruction and the target display brightness value of the display panel are obtained.
  • obtaining the brightness adjustment instruction and the target display brightness value of the display panel includes: generating the brightness adjustment instruction according to the user's operation instruction, and taking the display brightness value set by the user as the target display brightness value of the display panel; The brightness change of the ambient light generates a brightness adjustment instruction, and a target display brightness value of the display panel is generated according to the sensed brightness of the external ambient light.
  • the processor can parse the user’s instruction to further Obtaining the target display brightness value information of the display panel as set or desired by the user contained in the user's operation instruction and generating the brightness adjustment instruction, and then generating the corresponding brightness adjustment instruction and the target display brightness value of the display panel by the processor, which helps It is used to realize the active adjustment of the backlight brightness of the display panel.
  • the processor If the instruction to adjust the backlight brightness of the display panel is required, after the user sets the automatic brightness adjustment command, the processor generates the brightness based on the brightness of the external ambient light sensed by devices such as light sensors in the display device changes.
  • the adjustment instruction can be used by the processor to receive and parse the sensing result of the external ambient light by the light sensor, so as to obtain the optimal display brightness value of the display panel under the current external ambient light, that is, the target display brightness value, and then generate the corresponding brightness adjustment instruction. and the target display brightness value of the display panel, which helps to realize the intelligent adjustment of the backlight brightness of the display panel.
  • step S2 the duty cycle of the light emission control signal is adjusted based on the target display luminance value of the display panel.
  • the light-emitting control signal received by each row of light-emitting diodes in the backlight of the display panel includes N pulse periods, where N is A positive integer greater than 2.
  • adjusting the duty cycle of the light-emitting control signal based on the target display brightness value of the display panel includes: whenever the duty cycle of the light-emitting control signal needs to be adjusted, selecting a portion of the pulse period of the N pulse periods of the light-emitting control signal. The duty cycle is adjusted accordingly.
  • the present invention can improve the performance of the display panel.
  • the adjustable range of backlight brightness is larger.
  • selecting the duty ratios of some of the pulse periods in the N pulse periods of the light-emitting control signal for corresponding adjustment includes: selecting the odd-numbered pulse in the N pulse periods of the light-emitting control signal. The duty cycle of the period or even-numbered pulse period is adjusted accordingly.
  • the partial pulse period required to be adjusted correspondingly in one of the rows of light-emitting diodes is the odd-numbered pulse period, and the partial pulse period required to be adjusted correspondingly in the other row is the even-numbered pulse period.
  • the low-level time of each pulse period of the light-emitting control signal EM1 before adjustment is W1
  • the low level time of the first pulse period and the third pulse period of the lighting control signal EM1 corresponding to the row can be kept unchanged as W1, and only The low level time of the second pulse period and the fourth pulse period of the light emission control signal EM1 is adjusted to W2.
  • the low-level time of the second pulse period and the fourth pulse period of the light-emitting control signal EM1 corresponding to the two adjacent rows can be adjusted respectively.
  • the light-emitting control signal in one frame period of the Vsync signal contains only 3 pulse periods, only the odd-numbered (ie, the first and third) pulse periods are accounted for.
  • selecting the duty ratio of some pulse periods in the N pulse periods of the light-emitting control signal for corresponding adjustment includes: selecting the ith pulse period of the N pulse periods of the light-emitting control signal to The duty cycle of the kth pulse period is adjusted accordingly, where i is a positive integer greater than or equal to 1, k is a positive integer greater than i and less than or equal to N, and ki is less than N-1.
  • i is a positive integer greater than or equal to 1
  • k is a positive integer greater than i and less than or equal to N
  • ki is less than N-1.
  • the corresponding adjusted partial pulse period is the i-th pulse period to the k-th pulse period, and the part of the pulse period that needs to be adjusted correspondingly in another row is the i+m-th pulse period to the k+m-th pulse period, where m is an integer, and i+m is greater than or equal to 1, and k+m is less than or equal to N.
  • the low-level time of each pulse period of the light-emitting control signal EM1 before adjustment is W1
  • the low-level time from the first pulse period to the second or third pulse period of the light-emitting control signal EM1 corresponding to the row can be kept as W1
  • only the low level time from the second pulse period to the third or fourth pulse period of the light-emitting control signal EM1 is adjusted to W2.
  • only the low-power period from the second pulse period to the third or fourth pulse period of the light-emitting control signal EM1 corresponding to the two adjacent rows can be performed.
  • the average time is adjusted to W2; or the low level time from the first pulse period to the second pulse period of the light-emitting control signal EM1 corresponding to the first row of the two adjacent rows is adjusted to W2, and the two adjacent rows are The low level time from the second pulse period to the third pulse period or the third pulse period to the fourth pulse period of the light-emitting control signal EM1 corresponding to the second row is adjusted to W2. In this way, the number of times of repeatedly adjusting the duty cycle is reduced, and the adjustment difficulty and power consumption are also reduced.
  • selecting the duty ratios of some of the N pulse periods of the light-emitting control signal to adjust accordingly includes: selecting the duty ratios of the N pulse periods of the light-emitting control signal to be smaller than the first threshold value Or the duty cycle of the pulse period greater than the second threshold is adjusted accordingly.
  • the method for setting the first threshold includes: sorting the duty cycles of the N pulse periods in descending order, and selecting the duty cycle of the jth pulse period as the first threshold.
  • the method for setting the second threshold includes: sorting the duty cycles of the N pulse periods in ascending order, and selecting the duty cycle of the jth pulse period as the second threshold, where j is A positive integer less than N-1.
  • the respective low-level times are as follows: The order from large to small is the first pulse period, the second pulse period, the third pulse period and the fourth pulse period, and after calculation, it is necessary to adjust the low level time of the part of the pulse period of the light-emitting control signal EM1 to a specific value. value to adjust the duty cycle of the lighting control signal.
  • the duty ratio of the second pulse period can be used as the first threshold, and the light-emitting control signal EM1 corresponding to the row can be kept in the light-emitting control signal EM1.
  • the low-level time of the first pulse period and the second pulse period that is greater than or equal to the first threshold remains unchanged, and only the low-level time of the third pulse period and the fourth pulse period of the light-emitting control signal EM1 that is less than the first threshold value is used.
  • the normal time increases by a specific value.
  • the duty cycle of the third pulse period can be used as the second threshold to keep the light-emitting control signal EM1 corresponding to the row less than or
  • the low level time of the third pulse period and the fourth pulse period equal to the second threshold value remains unchanged, and only the low level time of the first pulse period and the second pulse period of the light-emitting control signal EM1 greater than the second threshold value is changed.
  • the time is decreased by a specific value. In this way, it is beneficial to maintain the balance of the N pulse periods of the light-emitting control signal in one frame period, thereby improving the driving quality of the backlight source of the display panel and enhancing the display effect.
  • selecting duty ratios of some of the N pulse periods of the light-emitting control signal to adjust accordingly includes: randomly selecting the duty ratio of some of the pulse periods of the N pulse periods of the light-emitting control signal The air ratio is adjusted accordingly. It should be noted that the above-mentioned embodiments are only described as exemplary embodiments. As long as the number of pulse periods of the light-emitting control signal that is changed by each adjustment is greater than 1 and less than N, it shall be used in the present invention. within the scope of protection.
  • the adjustment amount of the duty cycle of each pulse period in the corresponding adjusted partial pulse period is the same. to reduce the difficulty of adjustment.
  • step S3 the light-emitting diodes in the corresponding row of the backlight are driven to emit light by the adjusted light-emitting control signal.
  • the adjusted light-emitting control signal is output to the backlight driver to generate a corresponding driving current, and then the corresponding driving current of the backlight source in the display panel is driven by the driving current.
  • the LEDs in the row emit light, thereby completing the adjustment of the brightness of the backlight of the display panel, that is, the brightness of the screen.
  • the present invention adjusts the duty cycle of the lighting control signal received by the backlight source of the display panel based on the brightness adjustment command and the target display brightness value to realize the brightness adjustment of the display panel, because only the lighting control signal is adjusted correspondingly each time.
  • the duty ratio of the unit of the light-emitting control signal corresponds to the adjustment amount of the total brightness of the entire display panel, which is correspondingly reduced, which effectively improves the adjustment accuracy of the backlight brightness of the display panel.
  • the present invention since the duty ratio of part of the pulse periods (greater than 1) in the N pulse periods is adjusted each time, compared to only changing the duty ratio of one pulse period in one frame, the present invention has no effect on the brightness of the backlight of the display panel.
  • the adjustable range is larger.

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Abstract

一种亮度调节方法、装置及显示设备（100），该方法包括：获取亮度调节指令和显示面板（1）的目标显示亮度值，显示亮度值用以表征显示面板（1）的背光亮度；基于显示面板（1）的目标显示亮度值调节发光控制信号（EM）的占空比；由调节后的发光控制信号（EM）驱动背光源（6）中相应行的发光二极管发光，其中，每当需要调节发光控制信号（EM）的占空比时，选取发光控制信号（EM）的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。能够有效的提高显示面板（1）的背光亮度调节精度，且对显示面板（1）的背光亮度的可调节范围更大。

Description

亮度调节方法、装置及显示设备
本申请要求了申请日为2020年9月15日、申请号为2020109665896、名称为“亮度调节方法、装置及显示设备”的中国发明申请的优先权，并且通过参照上述中国发明申请的全部说明书、权利要求、附图和摘要的方式，将其引用于本申请。
技术领域
本发明涉及显示技术领域，具体涉及一种亮度调节方法、装置及显示设备。
背景技术
在电子工业中，背光是一种照明的形式，常被用于液晶显示器LCD(Liquid Crystal Display)上，被用来增加在低光源环境中的照明度和显示器、液晶荧幕上的亮度。发光二极管LED(Light Emitting Diode)是一种固态的半导体器件，它可以直接把电能转化为光能。近年来LED逐渐替代传统的冷阴极荧光灯管CCFL(Cold Cathode Fluorescent Lamp)作为LCD的背光源。
在LCD使用中，需要对LCD的亮度进行调节，现有技术中一般通过控制背光驱动器对背光源进行调光，从而达到对LCD亮度的调节，其中通常使用脉冲宽度调制(Pulse Width Modulation，简称PWM)波形控制LED驱动器进行调光。通过PWM波形控制LED驱动器进行调光，是使LED驱动器向LED背光源周期性的输出电流，使LED背光源周期性的开启和关闭，由于人眼对光源开启与关闭的切换不够敏感，当这一开启和关闭的频率超过100Hz，人眼看到的就是平均亮度，而不是LED光源在进行开启与关闭。而改变输入LED驱动器的PWM波形的占空比，则可调节在一个PWM波形周期里LED背光源开启与关闭的时间比例，从而达到对LCD亮度调节的效果。在一帧时间内，发光控制信号中低电 平时间越高，显示器的亮度越高，低电平时间越少，显示器的亮度越低。在一帧时间内，为了避免像素亮或暗的时间过长造成显示上的一些问题，通常在一个发光控制信号中会设计几个脉冲周期，每个脉冲周期中，低电平时代表此行像素点亮，高电平时代表此行像素不发光，因此发光控制信号中低电平的占空比越高，发光的时间越长，对应显示器的亮度越高。
在当前的显示驱动芯片中，通常使用亮度调节模块(Brightness Controller，简称BC模块)控制发光控制信号(EM信号)的低电平宽度进行屏幕亮度的调节。当显示面板的显示亮度值(DBV)发生改变时，通过BC模块计算出所需要的EM低电平宽度(或占空比)，进而改变发光二极管导通时间实现屏幕亮度的调节。但是由于EM信号低电平宽度以行为精度进行改变，当一帧中包含N个周期的EM信号时，EM信号的低电平宽度每改变n行，当前帧的总的EM信号低电平宽度改变N*n行，当N和n较大时，EM调节屏幕亮度的精度会很低，导致显示器在调整亮度条时出现亮度跳变过大的现象，影响用户体验。
因此，有必要提供改进的技术方案以克服现有技术中存在的以上技术问题。
发明内容
为了解决上述技术问题，本发明提供了一种亮度调节方法、装置及显示设备，能够有效的提高显示面板的背光亮度调节精度，且对显示面板的背光亮度的可调节范围更大。
根据本发明提供的一种亮度调节方法，其中，所述亮度调节方法包括：获取亮度调节指令和所述显示面板的目标显示亮度值，所述显示亮度值用以表征所述显示面板的背光亮度；基于所述显示面板的目标显示亮度值调节所述发光控制信号的占空比；由调节后的所述发光控制信号驱动所述背光源中相应行的发光二极管发光，其中，，所述显示面板背光源中每一行发光二极管所对应的发光控制信号均包括N个脉冲周期；以及每当需要调节所述发光控制信号的占空比时，选取所述发光控制信号 的N个脉冲周期中的部分脉冲周期的占空比进行对应调节，其中，N为大于2的正整数。
可选地，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：选取所述发光控制信号的N个脉冲周期中的第奇数个脉冲周期或第偶数个脉冲周期的占空比进行对应调节。
可选地，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：选取所述发光控制信号的N个脉冲周期中的第i个脉冲周期至第k个脉冲周期的占空比进行对应调节，其中，i为大于或等于1的正整数，k为大于i且小于或等于N的正整数，其中，k-i小于N-1。
可选地，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：选取所述发光控制信号的N个脉冲周期中占空比小于第一阈值或大于第二阈值的脉冲周期的占空比进行对应调节，其中，所述第一阈值的设置方法包括：对所述N个脉冲周期的占空比按照从大到小的顺序进行排序，并选取其中排在第j位的脉冲周期的占空比作为所述第一阈值；所述第二阈值的设置方法包括：对所述N个脉冲周期的占空比按照从小到大的顺序进行排序，并选取其中排在第j位的脉冲周期的占空比作为所述第二阈值，其中，j为小于N-1的正整数。
可选地，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：随机选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。
可选地，所述背光源中相邻行的发光二极管分别所需对应调节的所述部分脉冲周期均为第奇数个脉冲周期或第偶数个脉冲周期；或者所述背光源中相邻行的发光二极管中其中之一行所需对应调节的所述部分脉冲周期为第奇数个脉冲周期，其中另一行所需对应调节的所述部分脉冲周期为第偶数个脉冲周期。
可选地，所述背光源中相邻行的发光二极管分别所需对应调节的所述部分脉冲周期均为第i个脉冲周期至第k个脉冲周期；或者所述背光源中相邻行的发光二极管中其中之一行所需对应调节的所述部分脉冲周 期为第i个脉冲周期至第k个脉冲周期，其中另一行所需对应调节的所述部分脉冲周期为第i+m个脉冲周期至第k+m个脉冲周期，其中，m为整数，且i+m大于或等于1，k+m小于或等于N。
可选地，对应调节的所述部分脉冲周期中每个脉冲周期的占空比的调节量均相同。
可选地，获取亮度调节指令和所述显示面板的目标显示亮度值包括：根据用户的操作指令生成所述亮度调节指令，以及根据用户设定的显示亮度值作为所述显示面板的目标显示亮度值；或者根据外界环境光的亮度变化生成所述亮度调节指令，以及根据感测到的外界环境光的亮度生成所述显示面板的目标显示亮度值。
根据本发明提供的一种亮度调节装置，所述亮度调节装置可用于执行如上述的亮度调节方法，其中，所述显示面板在显示每一帧画面时，显示面板的背光源中每一行发光二极管接收的发光控制信号均包括N个脉冲周期，N为大于2的正整数，该装置包括：处理器，用以生成亮度调节指令和所述显示面板的目标显示亮度值；时序控制器，与所述处理器连接，接收所述亮度调节指令和所述目标显示亮度值，并根据所述亮度调节指令和所述目标显示亮度值调节输出的发光控制信号的占空比；背光驱动器，与所述控制器连接，接收调节后的所述发光控制信号以生成相应的驱动电流，所述驱动电流用以驱动所述背光源发光，其中，每当需要调节所述发光控制信号的占空比时，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。
可选地，所述时序控制器包括：计算模块，用以根据所述显示面板的目标显示亮度值计算输出的所述发光控制信号中每个脉冲周期的占空比；信号产生模块，与所述计算单元连接，用以根据所述计算模块的计算结果生成所述发光控制信号。
可选地，所述装置还包括：存储器，分别与所述处理器和所述时序控制器连接，用以建立显示亮度值与对应发光控制信号的占空比之间的映射关系并进行存储。
根据本发明提供的一种显示设备，包括：如上述的亮度调节装置。
本发明的有益效果是：本发明公开了一种亮度调节方法、装置及显示设备，在基于亮度调节指令和目标显示亮度值调节显示面板的背光源所接收的发光控制信号的占空比以实现对显示面板的亮度调节时，由于每次仅对应调节发光控制信号的N个脉冲周期中的部分脉冲周期的占空比，因此在需要调节的背光源中发光二极管的行数不变的情况下，减小了每行需要调节的脉冲周期数，进而每调节一个单位的发光控制信号的占空比，对应于整个显示面板的总亮度的调节量会相应的减小，有效的提高了显示面板的背光亮度调节精度。同时，由于每次调节的是N个脉冲周期中的部分脉冲周期(大于1且小于N)的占空比，相对于只改变一帧中一个脉冲周期的占空比，本发明对显示面板的背光亮度的可调节范围更大。
以第奇数个脉冲周期或第偶数脉冲周期作为需要调节的部分发光控制信号脉冲周期，保证了后续基于发光控制信号驱动的稳定性，进一步由于发光控制信号在一个帧周期内在奇数周期和偶数周期频率进行反复抖动变化，可以有效地从源头抑制电磁干扰。
将需要调节的发光控制信号的部分脉冲周期设置为连续的脉冲周期，减少了对占空比进行反复调节的次数，降低了调节难度和功耗。
在需要增大发光控制信号部分脉冲周期的占空比调节时，优选选取占空比小的脉冲周期进行调节，而在需要减小发光控制信号部分脉冲周期的占空比调节时，优选选取占空比大的脉冲周期进行调节，有利于保持一个帧周期内发光控制信号的N个脉冲周期的平衡性，进而提高对显示面板背光源的驱动质量，增强显示效果。
应当说明的是，以上的一般描述和后文的细节描述仅是示例性和解释性的，并不能限制本发明。
附图说明
通过以下参照附图对本发明实施例的描述，本发明的上述以及其他目的、特征和优点将更为清楚。
图1示出根据本公开实施例提供的显示设备的结构示意图；
图2示出根据本公开实施例提供的一个帧周期内发光控制信号的波形示意图；
图3示出根据本公开实施例提供的亮度调节方法流程图。
具体实施方式
为了便于理解本发明，下面将参照相关附图对本发明进行更全面的描述。附图中给出了本发明的较佳实施例。但是，本发明可以通过不同的形式来实现，并不限于本文所描述的实施例。相反的，提供这些实施例的目的是使对本发明的公开内容的理解更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文在本发明的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本发明。下面，参照附图对本发明进行详细说明。
图1示出根据本公开实施例提供的显示设备的结构示意图，图2示出根据本公开实施例提供的一个帧周期内发光控制信号的波形示意图。
如图1所示，本实施例中，显示设备100包括显示面板1、源极驱动器2、栅极驱动器3、背光源6以及亮度调节装置(简称亮度调节装置)。
显示面板1包括多条扫描线和多条数据线、以及位于二者交叉位置的多个像素单元，每个像素单元分别包括薄膜晶体管和像素电极。位于同一行的像素单元的薄膜晶体管的栅极连接至同一条扫描线，且位于同一列的所述像素单元的薄膜晶体管的源极连接至同一条数据线。
进一步的，显示面板还包括背光源6，背光源6中设置有呈阵列排布的多个发光二极管，该多个发光二极管在发光时用以为显示面板的多个像素单元提供背光亮度。且可选的，背光源6的多个发光二极管与显示面板1上的多个像素单元为一一对应，例如，背光源6中的一行发光二极管对应显示面板1上的一行像素单元。
源极驱动器2连接至多条数据线，用于经由数据线将与灰阶驱动信号对应的灰阶电压施加至对应的薄膜晶体管。
栅极驱动器3连接至多条扫描线，用于提供栅极信号，以在每个帧周期中会依次扫描多条扫描线，选通对应的薄膜晶体管。
亮度调节装置与背光源6连接，用于向背光源6提供驱动电流，以控制背光源6的发光。
如图2所示，本实施例中，亮度调节装置进一步包括处理器7、时序控制器4和背光驱动器5。
处理器7用以根据用户指示或感测外接环境，进而生成亮度调节指令和显示面板的目标显示亮度值。
可选地，处理器7可在接收到用户的触控指令或信息输入指令等操作指令后，通过解析用户的指令进而获得用户的操作指令中包含的如用户设定或希望的显示面板的目标显示亮度值信息以及生成亮度调节指令，进而实现用户对显示面板的背光亮度的主动调节。
可选地，处理器7还可与显示设备100中的如光传感器连接，接收并解析光传感器对外接环境光的感测结果，进而在光传感器感测到外界环境光的亮度发生变化时生成亮度调节指令，同时解析光传感器对外接环境光的感测结果以获得在当前的外接环境光下显示面板的最佳显示亮度值即目标显示亮度值。
时序控制器4与处理器7连接。一方面，时序控制器4还分别与源极驱动器2和栅极驱动器3连接，用以向源极驱动器3提供多个开关信号SW(1，2，3，...，n)，以及向栅极驱动器4提供水平同步信号Vsyns、启动信号STV和多个时钟信号CLK(1，2，3，...，n)。
进一步的，处理器7根据显示面板的分辨率来缩放从外部数据源输入的图像数据，并将该图像数据连同多个同步信号一起提供至时序控制器4。该多个同步信号至少包括时钟使能信号和数据使能信号，并进一步包括水平同步信号和垂直同步信号。时序控制器4使用各种提高图像质量和降低功耗的数据处理方法修正从处理器7输入的图像数据，并向源极驱动器2提供相应的灰阶驱动信号。
此外，时序控制器4还用于根据从处理器7输入的多个同步信号产生用于控制源极驱动器2和栅极驱动器3时序的时序信号。时序信号例如包括用于控制源极驱动器2的数据信号锁存的源极起始脉冲和源极采样脉冲、用于控制数据信号极性的极性控制信号、以及用于控制数据信号输出周期的使能信号等。时序信号还包括用于控制栅极驱动器3栅极信号扫描的起始脉冲信号和移位时钟、以及用于控制栅极信号输出周期的使能信号等。
另一方面，时序控制器4还与背光驱动器5连接，用于向背光驱动器5提供具有一定占空比的发光控制信号EM(发光控制信号EM或为脉宽调制信号)。
时序控制器4在接收处理器7提供的亮度调节指令和显示面板的目标显示亮度值，会根据所接收到的亮度调节指令和显示面板的目标显示亮度值调节输出的发光控制信号的占空比，而背光驱动器5接收时序控制器提供的调节后的发光控制信号以生成相应的驱动电流，该驱动电流用以驱动背光源6发光以及控制背光源6的发光亮度。
进一步地，在显示面板在显示每一帧画面时，显示面板的背光源中每一行发光二极管接收的发光控制信号EM均包括N个脉冲周期，且N为大于2的正整数。本发明实施例在每当需要调节发光控制信号EM的占空比时，为选取发光控制信号EM的N个脉冲周期中的部分脉冲周期的占空比进行对应调节，其中，所选取的部分脉冲周期的个数为大于一个且小于N个。如此，以提高显示面板的背光亮度调节精度，且确保对显示面板的背光亮度的可调节范围更大。
进一步地，本实施例中，时序控制器4还进一步包括：计算模块41和信号生成模块42。其中，计算模块41用以根据显示面板1的目标显示亮度值计算输出的发光控制信号EM的每个脉冲周期的占空比或低电平时间。信号产生模块42与计算单元41连接，用以根据计算模块41的计算结果生成最终的发光控制信号EM。
进一步地，本实施例中，亮度调节装置还包括存储器8。存储器8分别与处理器7和时序控制器4连接，用以建立显示亮度值与对应发光控制信号的占空比之间的映射关系并进行存储。如此，当后续显示面板的背光亮度需要调节至的目标显示亮度值为已经存储过的数值时，可以直接从存储器中查找读取对应的发光控制信号的占空比，进而省去计算的过程，节省了装置的运算资源，也能够提高调节速度。
如图2所示，本实施例中，设定水平同步信号Vsyns的一个帧周期内显示面板显示一帧画面，EM1表示调节前的发光控制信号，EM2表示调节后的发光控制信号，W1和W2均用以表示发光控制信号中每个脉冲周期的低电平时间，继而用以表征发光控制信号的每个脉冲周期的占空比。参考图2可知，在水平同步信号Vsyns的一个帧周期内，若调节前的发光控制信号EM1中N个脉冲周期中，每个脉冲周期的低电平时间均为W1，即此时调节前的发光控制信号EM1中每个脉冲周期具有第一占空比。那么基于本发明公开的技术方案而调节后的发光控制信号EM2的N个脉冲周期中，由于仅改变了部分脉冲周期，如图2中为仅改变第偶数个脉冲周期的占空比，使得其第奇数个脉冲周期具有第一占空比，而第偶数个脉冲周期具有第二占空比，如此，也能起到改变背光驱动器5输出的驱动电流的大小的目的，继而达到调节显示面板1的背光亮度的目的。同时由于每次改变的脉冲周期的个数大于1，也使得对显示面板的背光亮度的可调节范围更大。
可以理解的是，本发明所公开的技术方案中，每当需要调节发光控制信号EM的占空比时，选取的发光控制信号EM的N个脉冲周期中的部分脉冲周期的占空比中的部分脉冲周期包括但不限于如图2中所示的改变第偶数个脉冲周期的低电平时间，在本公开的其它实施例中，该部分脉冲周期还可为N个脉冲周期中的第奇数个脉冲周期，或N个脉冲周期中连续的一个或多个连续的部分脉冲周期，或随机的部分脉冲周期等，只要每次调整改变的脉冲周期的数量大于1且小于N即可。同时，当需要对发光控制信号EM进行多次调节(如对背光源中对应相邻两行发光二 极管所接收的发光控制信号的分别调节，或对相邻的两帧显示画面的亮度调节)时，每相邻两次所改变的脉冲周期的位置可以是相同位置处的脉冲周期，也可以是至少不同位置处的脉冲周期，本发明对此不做限定。进一步需要说明的是，在上述描述中，若以第奇数个脉冲周期或第偶数脉冲周期作为需要调节的部分发光控制信号脉冲周期，能够保证后续基于发光控制信号驱动的稳定性，且由于发光控制信号在一个帧周期内在奇数周期和偶数周期频率进行反复抖动变化，可以有效地从源头抑制电磁干扰。而若将需要调节的发光控制信号的部分脉冲周期设置为连续的脉冲周期，则可以相应的减少对占空比进行反复调节的次数，降低调节难度和功耗。
进一步地，在需要增大发光控制信号部分脉冲周期的占空比调节时，可以优选选取占空比小的脉冲周期进行调节，而在需要减小发光控制信号部分脉冲周期的占空比调节时，可以优选选取占空比大的脉冲周期进行调节。如此，有利于保持一个帧周期内发光控制信号的N个脉冲周期的平衡性，进而提高对显示面板背光源的驱动质量，增强显示效果。
需要说明的是，本文中所描述的改变脉冲周期的占空比与改变脉冲周期的低电平时间所要表述的为同一个意思，因此其不应成为对本发明的限定于否定)。
图3示出根据本公开实施例提供的亮度调节方法流程图。
如图3所示，本实施例中，亮度调节方法可应用于如图1和图2中所示的亮度调节装置和显示设备。其中，亮度调节方法包括执行步骤S1至步骤S3。
具体地，在步骤S1中，获取亮度调节指令和显示面板的目标显示亮度值。
本实施例中，获取亮度调节指令和显示面板的目标显示亮度值包括：根据用户的操作指令生成亮度调节指令，以及根据用户设定的显示亮度值作为显示面板的目标显示亮度值；或者根据外界环境光的亮度变化生成 亮度调节指令，以及根据感测到的外界环境光的亮度生成显示面板的目标显示亮度值。
其中，参考图1，若需要进行显示面板的背光亮度调节的指令为使用者主动下达的，可由处理器在接收到用户通过触控或信息输入等下达的操作指令后，通过解析用户的指令进而获得用户的操作指令中包含的如用户设定或希望的显示面板的目标显示亮度值信息以及生成亮度调节指令，进而由处理器生成相应的亮度调节指令和显示面板的目标显示亮度值，有助于实现对显示面板的背光亮度的主动调节。
而若需要进行显示面板的背光亮度调节的指令为使用者在设置自动亮度调节命令后，由处理器基于显示设备中的如光传感器等器件感测到的外界环境光的亮度发生变化时生成亮度调节指令，可由处理器接收和解析光传感器对外接环境光的感测结果，以获得在当前的外接环境光下显示面板的最佳显示亮度值即目标显示亮度值，进而生成相应的亮度调节指令和显示面板的目标显示亮度值，有助于实现对显示面板的背光亮度的智能调节。
需要说明的是，本文中，上述显示亮度值用以表征显示面板的背光亮度。在步骤S2中，基于显示面板的目标显示亮度值调节发光控制信号的占空比。
基于上述对图1和图2的描述，本实施例中，显示面板在显示每一帧画面时，显示面板的背光源中每一行发光二极管接收的发光控制信号均包括N个脉冲周期，N为大于2的正整数。进而，基于显示面板的目标显示亮度值调节发光控制信号的占空比包括：每当需要调节所述发光控制信号的占空比时，选取发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。如此，在需要调节的显示面板背光源中发光二极管的行数不变的情况下，减小了每行需要调节的脉冲周期数，进而每调节一个单位的发光控制信号的占空比，对应于整个显示面板的总亮度的调节量会相应的减小，有效的提高了显示面板的背光亮度调节精度。同时，由于每次调节的是N个脉冲周期中的部分脉冲周期(大于1)的 占空比，相对于现有的只改变一帧中一个脉冲周期的占空比，本发明对显示面板的背光亮度的可调节范围更大。
进一步地，在本发明的一个实施例中，选取发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：选取发光控制信号的N个脉冲周期中的第奇数个脉冲周期或第偶数个脉冲周期的占空比进行对应调节。同时基于本实施例描述的方案，可设置背光源中相邻行的发光二极管分别所需对应调节的部分脉冲周期均为第奇数个脉冲周期或第偶数个脉冲周期；或者设置背光源中相邻行的发光二极管中其中之一行所需对应调节的部分脉冲周期为第奇数个脉冲周期，其中另一行所需对应调节的部分脉冲周期为第偶数个脉冲周期。
参考图1和图2，以Vsyns信号的一个帧周期内发光控制信号包含有4个脉冲周期为例，若调节前的发光控制信号EM1的每个脉冲周期的低电平时间均为W1，且经过计算，需要将发光控制信号EM1的部分脉冲周期的低电平时间调整至W2以调节发光控制信号的占空比(在一个脉冲周期内，由于脉冲周期的总时长不变，若改变其低电平时长，则相应的占空比也会随之改变)。此时，对于背光源中某一行所接收的发光控制信号的调节，可保持该行所对应的发光控制信号EM1的第1脉冲周期和第3脉冲周期的低电平时间为W1不变，仅将发光控制信号EM1的第2脉冲周期和第4脉冲周期的低电平时间调节至W2。同时，对于背光源中相邻两行所接收的发光控制信号的调节，可分别仅将该相邻两行对应的发光控制信号EM1的第2脉冲周期和第4脉冲周期的低电平时间调节至W2；或者将该相邻两行中第一行对应的发光控制信号EM1的第2脉冲周期和第4脉冲周期的低电平时间调节至W2，而将该相邻两行中第二行对应的发光控制信号EM1的第1脉冲周期和第3脉冲周期的低电平时间调节至W2。如此，保证了后续基于发光控制信号驱动的稳定性，进一步由于发光控制信号在一个帧周期内在奇数周期和偶数周期频率进行反复抖动变化，也能够有效地从源头抑制电磁干扰。需要特别说明的是，本实施例中，当Vsyns信号的一个帧周期内发光控制信号仅包含有3个 脉冲周期时，只对第奇数个(即第1个和第3个)脉冲周期的占空比进行调节，以确保每次调节的脉冲周期的个数大于1且小于N(N＝3时)。在本发明的另一个实施例中，选取发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：选取发光控制信号的N个脉冲周期中的第i个脉冲周期至第k个脉冲周期的占空比进行对应调节，其中，i为大于或等于1的正整数，k为大于i且小于或等于N的正整数，以及，k-i小于N-1。同时基于本实施例描述的方案，可设置背光源中相邻行的发光二极管分别所需对应调节的部分脉冲周期均为第i个脉冲周期至第k个脉冲周期，或者设置其中之一行所需对应调节的部分脉冲周期为第i个脉冲周期至第k个脉冲周期，其中另一行所需对应调节的部分脉冲周期为第i+m个脉冲周期至第k+m个脉冲周期，其中，m为整数，且i+m大于或等于1，k+m小于或等于N。
参考图1和图2，以Vsyns信号的一个帧周期内发光控制信号包含有4个脉冲周期为例，若调节前的发光控制信号EM1的每个脉冲周期的低电平时间均为W1，且经过计算，需要将发光控制信号EM1的部分脉冲周期的低电平时间调整至W2以调节发光控制信号的占空比。此时，对于背光源中某一行所接收的发光控制信号的调节，可保持该行所对应的发光控制信号EM1的第1脉冲周期至第2或第3脉冲周期的低电平时间为W1不变，仅将发光控制信号EM1的第2脉冲周期至第3或第4脉冲周期的低电平时间调节至W2。同时，对于背光源中相邻两行所接收的发光控制信号的调节，可分别仅将该相邻两行对应的发光控制信号EM1的第2脉冲周期至第3或第4脉冲周期的低电平时间调节至W2；或者将该相邻两行中第一行对应的发光控制信号EM1的第1脉冲周期至第2脉冲周期的低电平时间调节至W2，而将该相邻两行中第二行对应的发光控制信号EM1的第2脉冲周期至第3脉冲周期或第3脉冲周期至第4脉冲周期的低电平时间调节至W2。如此，减少了对占空比进行反复调节的次数，也降低了调节难度和功耗。
在本发明的再一个实施例中，选取发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：选取发光控制信号的N个脉冲周期中占空比小于第一阈值或大于第二阈值的脉冲周期的占空比进行对应调节。其中，第一阈值的设置方法包括：对N个脉冲周期的占空比按照从大到小的顺序进行排序，并选取其中排在第j位的脉冲周期的占空比作为第一阈值。第二阈值的设置方法包括：对N个脉冲周期的占空比按照从小到大的顺序进行排序，并选取其中排在第j位的脉冲周期的占空比作为第二阈值，其中，j为小于N-1的正整数。具体地，当需要增大发光控制信号的部分脉冲信号的占空比时，对应调节发光控制信号的N个脉冲周期中占空比小于第一阈值的脉冲周期的占空比；当需要减小发光控制信号的部分脉冲信号的占空比时，对应调节发光控制信号的N个脉冲周期中占空比大于第二阈值的脉冲周期的占空比。
参考图1和图2，以Vsyns信号的一个帧周期内发光控制信号包含有4个脉冲周期为例，若调节前的发光控制信号EM1的4个脉冲周期中，各自的低电平时间按从大到小的顺序排列分别依次为第1脉冲周期、第2脉冲周期、第3脉冲周期和第4脉冲周期，且经过计算，需要将发光控制信号EM1的部分脉冲周期的低电平时间调整特定值以调节发光控制信号的占空比。则此时，对于背光源中某一行所接收的发光控制信号若需要增大其占空比，可以第2脉冲周期的占空比作为第一阈值，保持该行所对应的发光控制信号EM1中大于或等于第一阈值的第1脉冲周期和第2脉冲周期的低电平时间保持不变，仅将发光控制信号EM1中小于该第一阈值的第3脉冲周期和第4脉冲周期的低电平时间增大特定值。而对于背光源中某一行所接收的发光控制信号若需要减小其占空比的，可以第3脉冲周期的占空比作为第二阈值，保持该行所对应的发光控制信号EM1中小于或等于该第二阈值的第3脉冲周期和第4脉冲周期的低电平时间保持不变，仅将发光控制信号EM1中大于该第二阈值的第1脉冲周期和第2脉冲周期的低电平时间减小特定值。如此，有利于保持一个 帧周期内发光控制信号的N个脉冲周期的平衡性，进而提高对显示面板背光源的驱动质量，增强显示效果。
在本发明的又一个实施例中，选取发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：随机选取发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。需要说明的是，上述所例举的实施例均仅作为示例性的实施例进行的描述，只要每次调整改变的发光控制信号的脉冲周期的数量大于1且小于N的，均应在本发明的保护范围之内。
进一步地，在同一帧的显示画面内，对应调节的部分脉冲周期中每个脉冲周期的占空比的调节量均相同。以降低调节难度。
在步骤S3中，由调节后的发光控制信号驱动背光源中相应行的发光二极管发光。
基于上述步骤对发光控制信号的占空比或低电平时间进行调节后，将调节后的发光控制信号输出至背光驱动器以产生对应的驱动电流，再由驱动电流驱动显示面板中背光源的相应行的发光二极管发光，进而完成对显示面板的背光亮度即屏幕亮度的调节。
综上，本发明在基于亮度调节指令和目标显示亮度值调节显示面板的背光源所接收的发光控制信号的占空比以实现对显示面板的亮度调节时，由于每次仅对应调节发光控制信号的N个脉冲周期中的部分脉冲周期的占空比，因此在需要调节的背光源中发光二极管的行数不变的情况下，减小了每行需要调节的脉冲周期数，进而每调节一个单位的发光控制信号的占空比，对应于整个显示面板的总亮度的调节量会相应的减小，有效的提高了显示面板的背光亮度调节精度。同时，由于每次调节的是N个脉冲周期中的部分脉冲周期(大于1)的占空比，相对于只改变一帧中一个脉冲周期的占空比，本发明对显示面板的背光亮度的可调节范围更大。
应当说明的是，在本文中，所含术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、 物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。最后应说明的是：显然，上述实施例仅仅是为清楚地说明本发明所作的举例，而并非对实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而由此所引申出的显而易见的变化或变动仍处于本发明的保护范围之中。

Claims (13)

  1. 一种亮度调节方法，其中，所述亮度调节方法包括：
    获取亮度调节指令和所述显示面板的目标显示亮度值，所述显示亮度值用以表征所述显示面板的背光亮度；
    基于所述显示面板的目标显示亮度值调节发光控制信号的占空比；
    由调节后的所述发光控制信号驱动所述显示面板背光源中相应行的发光二极管发光，
    其中，所述显示面板背光源中每一行发光二极管所对应的发光控制信号均包括N个脉冲周期；以及
    每当需要调节所述发光控制信号的占空比时，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节，
    其中，N为大于2的正整数。
  2. 根据权利要求1所述的亮度调节方法，其中，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：
    选取所述发光控制信号的N个脉冲周期中的第奇数个脉冲周期或第偶数个脉冲周期的占空比进行对应调节。
  3. 根据权利要求1所述的亮度调节方法，其中，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：
    选取所述发光控制信号的N个脉冲周期中的第i个脉冲周期至第k个脉冲周期的占空比进行对应调节，
    其中，i为大于或等于1的正整数，k为大于i且小于或等于N的正整数，
    其中，k-i小于N-1。
  4. 根据权利要求1所述的亮度调节方法，其中，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：
    选取所述发光控制信号的N个脉冲周期中占空比小于第一阈值或大于第二阈值的脉冲周期的占空比进行对应调节，
    其中，所述第一阈值的设置方法包括：
    对所述N个脉冲周期的占空比按照从大到小的顺序进行排序，并选取其中排在第j位的脉冲周期的占空比作为所述第一阈值；
    所述第二阈值的设置方法包括：
    对所述N个脉冲周期的占空比按照从小到大的顺序进行排序，并选取其中排在第j位的脉冲周期的占空比作为所述第二阈值，
    其中，j为小于N-1的正整数。
  5. 根据权利要求1所述的亮度调节方法，其中，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节包括：
    随机选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。
  6. 根据权利要求2所述的亮度调节方法，其中，所述背光源中相邻行的发光二极管分别所需对应调节的所述部分脉冲周期均为第奇数个脉冲周期或第偶数个脉冲周期；或者
    所述背光源中相邻行的发光二极管中其中之一行所需对应调节的所述部分脉冲周期为第奇数个脉冲周期，其中另一行所需对应调节的所述部分脉冲周期为第偶数个脉冲周期。
  7. 根据权利要求3所述的亮度调节方法，其中，所述背光源中相邻行的发光二极管分别所需对应调节的所述部分脉冲周期均为第i个脉冲周期至第k个脉冲周期；或者
    所述背光源中相邻行的发光二极管中其中之一行所需对应调节的所述部分脉冲周期为第i个脉冲周期至第k个脉冲周期，其中另一行所需对应调节的所述部分脉冲周期为第i+m个脉冲周期至第k+m个脉冲周期，
    其中，m为整数，且i+m大于或等于1，k+m小于或等于N。
  8. 根据权利要求1-7中任一项所述的亮度调节方法，其中，对应调节的所述部分脉冲周期中每个脉冲周期的占空比的调节量均相同。
  9. 根据权利要求1所述的亮度调节方法，其中，获取亮度调节指令和所述显示面板的目标显示亮度值包括：
    根据用户的操作指令生成所述亮度调节指令，以及根据用户设定的显示亮度值作为所述显示面板的目标显示亮度值；或者
    根据外界环境光的亮度变化生成所述亮度调节指令，以及根据感测到的外界环境光的亮度生成所述显示面板的目标显示亮度值。
  10. 一种亮度调节装置，所述亮度调节装置可用于执行如权利要求1-9中任一项所述的亮度调节方法，其中，所述显示面板在显示每一帧画面时，显示面板的背光源中每一行发光二极管接收的发光控制信号均包括N个脉冲周期，N为大于2的正整数，该装置包括：
    处理器，用以生成亮度调节指令和所述显示面板的目标显示亮度值；
    时序控制器，与所述处理器连接，接收所述亮度调节指令和所述目标显示亮度值，并根据所述亮度调节指令和所述目标显示亮度值调节输出的发光控制信号的占空比；
    背光驱动器，与所述控制器连接，接收调节后的所述发光控制信号以生成相应的驱动电流，所述驱动电流用以驱动所述背光源发光，
    其中，每当需要调节所述发光控制信号的占空比时，选取所述发光控制信号的N个脉冲周期中的部分脉冲周期的占空比进行对应调节。
  11. 根据权利要求10所述的亮度调节装置，其中，所述时序控制器包括：
    计算模块，用以根据所述显示面板的目标显示亮度值计算输出的所述发光控制信号中每个脉冲周期的占空比；
    信号产生模块，与所述计算单元连接，用以根据所述计算模块的计算结果生成所述发光控制信号。
  12. 根据权利要求11所述的亮度调节装置，其中，所述装置还包括：
    存储器，分别与所述处理器和所述时序控制器连接，用以建立显示亮度值与对应发光控制信号的占空比之间的映射关系并进行存储。
  13. 一种显示设备，其中，包括：如权利要求10-12中任一项所述的亮度调节装置。
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CN114822394A (zh) * 2022-05-05 2022-07-29 武汉天马微电子有限公司 显示面板的调光方法、装置、设备及计算机可读存储介质
CN114822394B (zh) * 2022-05-05 2023-06-30 武汉天马微电子有限公司 显示面板的调光方法、装置、设备及计算机可读存储介质

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