WO2020238038A1 - 发光元件的驱动方法及装置 - Google Patents

发光元件的驱动方法及装置 Download PDF

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Publication number
WO2020238038A1
WO2020238038A1 PCT/CN2019/116595 CN2019116595W WO2020238038A1 WO 2020238038 A1 WO2020238038 A1 WO 2020238038A1 CN 2019116595 W CN2019116595 W CN 2019116595W WO 2020238038 A1 WO2020238038 A1 WO 2020238038A1
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Prior art keywords
brightness
emitting element
light
driving
pixel
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PCT/CN2019/116595
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English (en)
French (fr)
Inventor
陈书志
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深圳市华星光电半导体显示技术有限公司
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Application filed by 深圳市华星光电半导体显示技术有限公司 filed Critical 深圳市华星光电半导体显示技术有限公司
Priority to US16/620,929 priority Critical patent/US11587498B2/en
Publication of WO2020238038A1 publication Critical patent/WO2020238038A1/zh

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Classifications

    • 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
    • G09G3/22—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]
    • 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
    • G09G3/2007—Display of intermediate tones
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
    • G09G3/2081—Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation
    • 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
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude 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
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours
    • 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

Definitions

  • the present invention relates to the technical field of display panels, in particular to a method and device for driving a light-emitting element.
  • PWM backlight modulation
  • the high-frequency data line signal is used to quickly turn on and off the LED, and the expected display brightness is superimposed within the scan time.
  • the drive device inputs a certain number of the same pulses to the LED through the data line (Data) to control the number of times the LED is lit to superimpose the brightness.
  • the brightness of LED1 is L1
  • the brightness of LED2 is 3L1
  • the brightness of LED3 is 6L1.
  • the driving device needs to input 256 pulses to the corresponding LED to superimpose the brightness, which makes the driving efficiency of the driving device low, and thus the number of driving channels supported by the driving device is small.
  • the embodiment of the present invention provides a method and device for driving a light emitting element, which can improve driving efficiency and increase the number of driving channels supported.
  • the embodiment of the present invention provides a method for driving a light emitting element, including:
  • At least one pulse signal is selected from a plurality of preset pulse signals to drive the light-emitting element.
  • the driving voltages or driving currents of the multiple preset pulse signals are different.
  • the selecting at least one pulse signal from a plurality of preset pulse signals to drive the light-emitting element according to the backlight brightness specifically includes:
  • a corresponding number of pulse signals are sent to the light-emitting element according to the selected brightness and the number of superimpositions to drive the light-emitting element.
  • the light-emitting element includes at least one LED
  • the calculation of the backlight brightness required for the display image specifically includes:
  • the backlight brightness required by each pixel partition is calculated according to the pixel grayscale value.
  • the selecting at least one pulse signal from a plurality of preset pulse signals to drive the light-emitting element according to the backlight brightness specifically includes:
  • At least one pulse signal is selected from a variety of preset pulse signals to drive the LED corresponding to the pixel subarea.
  • the embodiment of the present invention also provides a method for driving a light-emitting element, including:
  • At least one pulse signal is selected from a plurality of preset pulse signals to drive the light-emitting element.
  • the selecting at least one pulse signal from a plurality of preset pulse signals to drive the light-emitting element according to the backlight brightness specifically includes:
  • a corresponding number of pulse signals are sent to the light-emitting element according to the selected brightness and the number of superimpositions to drive the light-emitting element.
  • the light-emitting element includes at least one LED
  • the calculation of the backlight brightness required for the display image specifically includes:
  • the backlight brightness required by each pixel partition is calculated according to the pixel grayscale value.
  • the selecting at least one pulse signal from a plurality of preset pulse signals to drive the light-emitting element according to the backlight brightness specifically includes:
  • At least one pulse signal is selected from a variety of preset pulse signals to drive the LED corresponding to the pixel subarea.
  • An embodiment of the present invention also provides a driving device for a light-emitting element, including:
  • Display image acquisition module for acquiring display images
  • a backlight brightness calculation module for calculating the backlight brightness required for the display image
  • the driving module is used to select at least one pulse signal from a variety of preset pulse signals to drive the light-emitting element according to the brightness of the backlight.
  • the driving voltages or driving currents of the multiple preset pulse signals are different.
  • the driving module specifically includes:
  • the query unit is used to query and obtain the brightness corresponding to each pulse signal from the preset brightness relationship table according to the preset driving voltage or driving current of each pulse signal;
  • the selection unit is configured to select at least one brightness from a variety of brightness to superimpose according to the backlight brightness, and calculate the number of superimposition required for each selected brightness;
  • the driving unit is configured to send a corresponding number of pulse signals to the light-emitting element according to the selected brightness and the number of superimpositions to drive the light-emitting element.
  • the light-emitting element includes at least one LED
  • the backlight brightness calculation module specifically includes:
  • a dividing unit configured to divide the display image into at least one pixel partition, and the at least one pixel partition corresponds to the at least one LED in a one-to-one correspondence;
  • the grayscale value obtaining unit is used to obtain the pixel grayscale value of each pixel partition respectively.
  • the backlight brightness calculation unit is configured to calculate the backlight brightness required by each pixel partition according to the pixel grayscale value.
  • the driving module is specifically used for:
  • At least one pulse signal is selected from a variety of preset pulse signals to drive the LED corresponding to the pixel subarea.
  • the beneficial effects of the present invention are: acquiring a display image, and calculating the backlight brightness required for the display image, so as to select at least one pulse signal from a variety of preset pulse signals to drive the light-emitting element according to the backlight brightness, that is, by selecting Different pulse signals drive the light-emitting elements to achieve the backlight brightness, effectively improve the driving efficiency, reduce the pulse output frequency, and increase the number of supported driving channels.
  • Figure 1 is a pulse waveform diagram of an LED in the prior art
  • FIG. 2 is a schematic flowchart of a method for driving a light-emitting element according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of the distribution of LEDs in a method for driving a light-emitting element according to an embodiment of the present invention
  • FIG. 4 is a graph showing the relationship between brightness and driving voltage in a driving method of a light-emitting element according to an embodiment of the present invention
  • FIG. 5 is a pulse waveform diagram of an LED in a method for driving a light-emitting element provided by an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a driving device for a light-emitting element provided by an embodiment of the present invention.
  • FIG. 2 is a schematic flowchart of a driving method of a light-emitting element according to an embodiment of the present invention.
  • the driving method of the light-emitting element provided in this embodiment includes:
  • the greater the brightness of the displayed image content the greater the required backlight brightness.
  • the backlight brightness required to display the image can be obtained by calculating the pixel grayscale value of the displayed image.
  • the backlight brightness is the brightness of the backlight light source.
  • the backlight light source is composed of a light-emitting element, and the light-emitting element includes at least one LED. That is, the backlight light source in this embodiment is an LED backlight.
  • the backlight source can be divided into at least one backlight zone, and each backlight zone corresponds to one LED.
  • the display image may be divided into at least one pixel subarea corresponding to the at least one backlight subarea in a one-to-one correspondence, and the backlight brightness of each backlight subarea is determined by the pixel grayscale value of its corresponding pixel subarea.
  • step 102 includes:
  • the backlight brightness required by each pixel partition is calculated according to the pixel grayscale value.
  • the required backlight brightness can be determined according to the average gray scale of all pixels in each pixel subarea, or according to each pixel in each pixel subarea.
  • the gray scale weighted value determines the required backlight brightness
  • the required backlight brightness can also be determined according to the average value of the maximum gray scales in the red, green and blue sub-pixels in each pixel partition.
  • the corresponding relationship between the pixel grayscale value of the pixel partition and the required backlight brightness can be as shown in Table 1.
  • the backlight brightness select at least one pulse signal from a plurality of preset pulse signals to drive the light-emitting element.
  • the preset multiple pulse signals have different drive voltages or drive currents.
  • one or more pulse signals are selected, and at least one corresponding pulse signal is sent to the light-emitting element according to the selected pulse signal. Pulse to drive the light-emitting element to light up.
  • the display brightness of the light-emitting elements driven by different pulse signals is different, and the required backlight brightness can be obtained by superimposing the brightness of the light-emitting elements driven by each pulse signal.
  • step 103 includes:
  • At least one pulse signal is selected from a variety of preset pulse signals to drive the LED corresponding to the pixel subarea.
  • the light-emitting elements correspond to multiple scan lines and multiple data lines.
  • the LEDs in the light-emitting elements are arranged in an array, and each row of LEDs corresponds to one scan line, and each column of LEDs Corresponds to a data line.
  • LED1 corresponds to data line D1 and scan line G1
  • LED2 corresponds to data line D2 and scan line G1
  • LED3 corresponds to data line D3 and scan line G1.
  • Each LED corresponds to a pixel partition.
  • a pulse signal is selected according to the backlight brightness to input at least one corresponding pulse to the corresponding LED according to the selected pulse signal.
  • the LED corresponding to the scan line inputs at least one corresponding pulse, that is, at least one corresponding pulse is input to the data line corresponding to the LED to drive the LED with the selected pulse signal.
  • the superimposed brightness after pulse driving is the required backlight brightness.
  • step 103 includes:
  • a corresponding number of pulse signals are sent to the light-emitting element according to the selected brightness and the number of superimpositions to drive the light-emitting element.
  • the preset brightness relationship table may be a correspondence relationship table between brightness and driving voltage, or a correspondence relationship table between brightness and driving current.
  • the brightness relation table can be based on LED
  • the LIV (light-current-voltage) curve is obtained.
  • the relationship between the brightness and the driving voltage is shown in Figure 4.
  • the LIV curves of different types of LEDs are different, that is, the corresponding relationship between the display brightness and the driving voltage is different.
  • the preset pulse signal includes a pulse signal with a driving voltage of 4V and a pulse signal with a driving voltage of 5V.
  • the query shows that the display brightness corresponding to the 4V pulse signal is L0, and the display brightness corresponding to the 5V pulse signal is 2L0.
  • the backlight brightness required by the pixel partition corresponding to LED1 is L0
  • the pulse signal with the display brightness of L0 is selected, that is, the 4V pulse signal, and the number of pulses is 1, in the scan line G1
  • the data line D1 of LED1 inputs a 4V pulse signal, so that a 4V pulse signal drives the brightness of the LED to L0
  • the backlight brightness required by the pixel partition corresponding to LED2 is 2L0
  • the display brightness is selected as 2L0
  • the pulse signal is a 5V pulse signal, and the number of pulses is 1.
  • the data line D2 of LED2 inputs a 5V pulse signal, so that a 5V pulse signal drives the LED brightness to 2L0 ;
  • the backlight brightness required by the pixel partition corresponding to LED3 is 3L0, then select a pulse signal with a display brightness of L0 and a pulse signal with a display brightness of 2L0, that is, a 4V pulse signal and a 5V pulse signal.
  • data line D3 of LED3 inputs one 4V pulse signal and one 5V pulse signal, so that one 4V pulse signal and one 5V pulse signal sequentially drive the LED and the brightness is superimposed to 3L0.
  • this embodiment improves the driving efficiency, reduces the pulse output frequency, and increases the number of driving channels supported.
  • the driving method of the light-emitting element can obtain a display image, and calculate the backlight brightness required for the display image, so as to select at least one pulse from a variety of preset pulse signals according to the backlight brightness Signals drive the light-emitting elements, that is, select different pulses to drive the light-emitting elements to achieve the backlight brightness, effectively improve the driving efficiency, reduce the pulse output frequency, and increase the number of supported driving channels.
  • an embodiment of the present invention also provides a driving device for a light-emitting element, which can implement all the processes in the foregoing embodiment.
  • the driving device in this embodiment can be integrated in the PWM driving chip.
  • the driving device for the light-emitting element provided in this embodiment includes:
  • Display image acquisition module 1 for acquiring display images
  • the backlight brightness calculation module 2 is used to calculate the backlight brightness required for the display image.
  • the driving module 3 is configured to select at least one pulse signal from a variety of preset pulse signals to drive the light-emitting element according to the brightness of the backlight.
  • the driving voltages or driving currents of the multiple preset pulse signals are different.
  • the driving module specifically includes:
  • the query unit is configured to query and obtain the display brightness corresponding to each pulse signal from the preset brightness relationship table according to the preset driving voltage or driving current of each pulse signal;
  • the selection unit is configured to select at least one display brightness from a variety of display brightness to superimpose according to the backlight brightness, and calculate the number of superimpositions required for each selected display brightness;
  • the driving unit is configured to send a corresponding number of pulse signals to the light-emitting element according to the selected display brightness and the number of superimpositions to drive the light-emitting element.
  • the light-emitting element includes at least one LED
  • the backlight brightness calculation module specifically includes:
  • a dividing unit configured to divide the display image into at least one pixel partition, and the at least one pixel partition corresponds to the at least one LED in a one-to-one correspondence;
  • the grayscale value obtaining unit is used to obtain the pixel grayscale value of each pixel partition respectively.
  • the backlight brightness calculation unit is configured to calculate the backlight brightness required by each pixel partition according to the pixel grayscale value.
  • the driving module is specifically used for:
  • At least one pulse signal is selected from a variety of preset pulse signals to drive the LED corresponding to the pixel subarea.
  • the driving device of the light-emitting element can obtain a display image and calculate the backlight brightness required for the display image, so as to select at least one pulse from a variety of preset pulse signals according to the backlight brightness Signals drive the light-emitting elements, that is, select different pulses to drive the light-emitting elements to achieve the backlight brightness, effectively improve the driving efficiency, reduce the pulse output frequency, and increase the number of supported driving channels.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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  • Liquid Crystal Display Device Control (AREA)
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Abstract

一种发光元件的驱动方法及装置。驱动方法包括：获取显示图像（101）；计算显示图像所需的背光亮度（102）；根据背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件（103）。其中预设的多种脉冲信号的驱动电压或驱动电流不同。

Description

发光元件的驱动方法及装置 技术领域
本发明涉及显示面板技术领域，尤其涉及一种发光元件的驱动方法及装置。
 背景技术
现有显示面板一般采用背光调制（PWM）技术来控制背光源的亮度，即利用时间切分瞬间亮度叠加来达到所需亮度。具体地，在扫描线逐行扫描时，利用高频的数据线信号让LED快速的发亮和关闭，并在扫描时间内叠加到预计的显示亮度。在扫描线（Gate）输入高电平时，驱动装置通过数据线（Data）向LED输入一定数量的相同脉冲，以控制LED发亮次数来叠加亮度，如图1所示，扫描线G1与数据线D1之间的LED1亮了1次，扫描线G1与数据线D2之间的LED2亮了3次，扫描线G1与数据线D4之间的LED4亮了6次，因此在扫描线G1输入高电平期间，LED1的亮度为L1，LED2的亮度为3L1，LED3的亮度为6L1。但是，若一帧图像的灰阶值为256，则驱动装置需要输入256个脉冲至相应LED来叠加亮度，使得驱动装置的驱动效率低下，进而导致驱动装置支持的驱动通道数量较少。
 技术问题
本发明实施例提供一种发光元件的驱动方法及装置，能够提高驱动效率，且提高驱动通道的支持数量。
 技术解决方案
本发明实施例提供了一种发光元件的驱动方法，包括：
获取显示图像；
计算所述显示图像所需的背光亮度；
根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
进一步地，所述预设的多种脉冲信号的驱动电压或驱动电流不同。
进一步地，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
根据预设的每种脉冲信号的驱动电压或驱动电流，从预设的亮度关系表中查询获得每种脉冲信号对应的亮度；
根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；
根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
进一步地，所述发光元件包括至少一个LED；
所述计算所述显示图像所需的背光亮度，具体包括：
将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
分别获取每一像素分区的像素灰阶值；
根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
进一步地，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
本发明实施例还提供了一种发光元件的驱动方法，包括：
获取显示图像；
计算所述显示图像所需的背光亮度；
根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
进一步地，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
从预设的亮度关系表中查询获得预设的每种脉冲信号对应的亮度；
根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；
根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
进一步地，所述发光元件包括至少一个LED；
所述计算所述显示图像所需的背光亮度，具体包括：
将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
分别获取每一像素分区的像素灰阶值；
根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
进一步地，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
本发明实施例还提供一种发光元件的驱动装置，包括：
显示图像获取模块，用于获取显示图像；
背光亮度计算模块，用于计算所述显示图像所需的背光亮度；以及，
驱动模块，用于根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
进一步地，所述预设的多种脉冲信号的驱动电压或驱动电流不同。
进一步地，所述驱动模块具体包括：
查询单元，用于根据预设的每种脉冲信号的驱动电压或驱动电流，从预设的亮度关系表中查询获得每种脉冲信号对应的亮度；
选择单元，用于根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；以及，
驱动单元，用于根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
进一步地，所述发光元件包括至少一个LED；
所述背光亮度计算模块具体包括：
划分单元，用于将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
灰阶值获取单元，用于分别获取每一像素分区的像素灰阶值；以及，
背光亮度计算单元，用于根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
进一步地，所述驱动模块具体用于：
根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
 有益效果
本发明的有益效果为：获取显示图像，并计算显示图像所需的背光亮度，以根据所述背光亮度从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，即通过选择不同的脉冲信号来驱动发光元件，达到所述背光亮度，有效提高驱动效率，且降低脉冲输出频率，提高驱动通道的支持数量。
 附图说明
为了更清楚地说明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有技术中LED的脉冲波形图；
图2为本发明实施例提供的发光元件的驱动方法的流程示意图；
图3为本发明实施例提供的发光元件的驱动方法中LED的分布示意图；
图4为本发明实施例提供的发光元件的驱动方法中亮度与驱动电压的曲线关系图；
图5为本发明实施例提供的发光元件的驱动方法中LED的脉冲波形图；
图6为本发明实施例提供的发光元件的驱动装置的结构示意图。
 本发明的实施方式
以下参考说明书附图介绍本发明的优选实施例，用以举例证明本发明可以实施，这些实施例可以向本领域中的技术人员完整介绍本发明的技术内容，使得本发明的技术内容更加清楚和便于理解。然而本发明可以通过许多不同形式的实施例来得以体现，本发明的保护范围并非仅限于文中提到的实施例。
本发明说明书中使用的术语仅用来描述特定实施方式，而并不意图显示本发明的概念。除非上下文中有明确不同的意义，否则，以单数形式使用的表达涵盖复数形式的表达。在本发明说明书中，应理解，诸如“包括”、“具有”以及“含有”等术语意图说明存在本发明说明书中揭示的特征、数字、步骤、动作或其组合的可能性，而并不意图排除可存在或可添加一个或多个其他特征、数字、步骤、动作或其组合的可能性。附图中的相同参考标号指代相同部分。
参见图2，是本发明实施例提供的发光元件的驱动方法的流程示意图。
如图2所示，本实施例提供的发光元件的驱动方法包括：
101、获取显示图像。
102、计算所述显示图像所需的背光亮度。
本实施例中，显示图像内容亮度越大，其所需的背光亮度越大。显示图像所需的背光亮度可以通过显示图像的像素灰阶值计算获得。
背光亮度为背光光源的亮度，背光光源由发光元件构成，所述发光元件包括至少一个LED，即本实施例中的背光光源为LED背光。背光光源可以划分为至少一个背光分区，每一背光分区对应一个LED。显示图像可以划分为与所述至少一个背光分区一一对应地至少一个像素分区，每一背光分区的背光亮度由其对应的像素分区的像素灰阶值来确定。
具体地，步骤102包括：
将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
分别获取每一像素分区的像素灰阶值；
根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
需要说明的是，在计算每一像素分区所需的背光亮度时，可以根据每一像素分区中所有像素的灰阶平均值确定其所需的背光亮度，也可以根据每一像素分区中各像素的灰阶加权值确定其所需的背光亮度，还可以根据每一像素分区中红绿蓝三色子像素中灰阶最大值的均值来确定其所需的背光亮度。例如，像素分区的像素灰阶值与其所需背光亮度的对应关系可以如表1所示。
像素灰阶值 背光亮度 （gamma=2.2）
32 10.40
64 47.78
128 219.52
196 560.50
255 1000.00
表1
103、根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
本实施例中，预设的多种脉冲信号的驱动电压或驱动电流不同，根据所需的背光亮度，选择一种或多种脉冲信号，并根据选择的脉冲信号向发光元件发送至少一个相应的脉冲，以驱动发光元件发亮。不同脉冲信号驱动发光元件的显示亮度不同，将发光元件在每一脉冲信号驱动下的亮度进行叠加，即可获得所需的背光亮度。
具体地，步骤103包括：
根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
本实施例中，如图3所示，发光元件与多条扫描线和多条数据线相对应，发光元件中的LED呈阵列排列，每一行的LED与一条扫描线相对应，每一列的LED与一条数据线相对应。例如，LED1对应数据线D1和扫描线G1；LED2对应数据线D2和扫描线G1；LED3对应数据线D3和扫描线G1。
每一LED对应一个像素分区，获取每一LED对应的像素分区所需的背光亮度后，根据背光亮度选择脉冲信号，以根据所选的脉冲信号向相应的LED输入至少一个相应的脉冲。在扫描线逐行扫描时，与该扫描线对应的LED输入至少一个相应的脉冲，即向该LED对应的数据线输入至少一个相应的脉冲，以采用所选的脉冲信号来驱动该LED，LED经脉冲驱动后叠加的亮度即为所需的背光亮度。
在一个实施方式中，步骤103包括：
根据预设的每种脉冲信号的驱动电压或驱动电流，从预设的亮度关系表中查询获得每种脉冲信号对应的亮度；
根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；
根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
需要说明的是，预设的亮度关系表可以为亮度与驱动电压的对应关系表，或者亮度与驱动电流的对应关系表。例如，亮度关系表可根据LED LIV（光-电流-电压）曲线获得，其中亮度与驱动电压的曲线关系图如图4所示，不同型号的LED的LIV曲线不同，即显示亮度与驱动电压对应关系不同。
先从亮度关系表中查询获得每一预设的脉冲信号对应的显示亮度，再根据所需的背光亮度选择脉冲信号并计算脉冲个数，不同脉冲信号的驱动电压或驱动电流不同，不同脉冲信号所需的个数也不相同。例如，预设的脉冲信号包括驱动电压为4V的脉冲信号和驱动电压为5V的脉冲信号，查询可知4V脉冲信号对应的显示亮度为L0，5V脉冲信号对应的显示亮度为2L0。
进而根据每一像素分区所需的背光亮度来选择显示亮度并计算所需叠加的个数，以向相应LED输入相应的脉冲。例如，如图3和图5所示，LED1对应的像素分区所需的背光亮度为L0，则选择显示亮度为L0的脉冲信号，即4V脉冲信号，且脉冲个数为1，在扫描线G1输入高电平期间，LED1的数据线D1输入1个4V脉冲信号，使1个4V脉冲信号驱动LED的亮度为L0；LED2对应的像素分区所需的背光亮度为2L0，则选择显示亮度为2L0的脉冲信号，即5V脉冲信号，且脉冲个数为1，在扫描线G1输入高电平期间，LED2的数据线D2输入1个5V脉冲信号，使1个5V脉冲信号驱动LED的亮度为2L0；LED3对应的像素分区所需的背光亮度为3L0，则选择1个显示亮度为L0的脉冲信号和1个显示亮度为2L0的脉冲信号，即1个4V脉冲信号和1个5V脉冲信号，在扫描线G1输入高电平期间，LED3的数据线D3输入1个4V脉冲信号和1个5V脉冲信号，使1个4V脉冲信号和1个5V脉冲信号依次驱动LED后亮度叠加为3L0。相对于现有技术中采用2个相同脉冲驱动LED2和3个相同脉冲驱动LED3来说，本实施例提高驱动效率，且降低脉冲输出频率，提高驱动通道的支持数量。
由上述可知，本实施例提供的发光元件的驱动方法，能够获取显示图像，并计算显示图像所需的背光亮度，以根据所述背光亮度从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，即通过选择不同的脉冲来驱动发光元件，达到所述背光亮度，有效提高驱动效率，且降低脉冲输出频率，提高驱动通道的支持数量。
相应地，本发明实施例还提供一种发光元件的驱动装置，能够实现上述实施例中的所有流程。本实施例中的驱动装置可以集成在PWM驱动芯片中。
如图6所示，本实施例提供的发光元件的驱动装置包括：
显示图像获取模块1，用于获取显示图像；
背光亮度计算模块2，用于计算所述显示图像所需的背光亮度；以及，
驱动模块3，用于根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
进一步地，所述预设的多种脉冲信号的驱动电压或驱动电流不同。
进一步地，所述驱动模块具体包括：
查询单元，用于根据预设的每种脉冲信号的驱动电压或驱动电流，从预设的亮度关系表中查询获得每种脉冲信号对应的显示亮度；
选择单元，用于根据所述背光亮度从多种显示亮度中选择至少一种显示亮度进行叠加，并计算所选的每种显示亮度所需叠加的个数；以及，
驱动单元，用于根据所选的每种显示亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
进一步地，所述发光元件包括至少一个LED；
所述背光亮度计算模块具体包括：
划分单元，用于将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
灰阶值获取单元，用于分别获取每一像素分区的像素灰阶值；以及，
背光亮度计算单元，用于根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
进一步地，所述驱动模块具体用于：
根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
由上述可知，本实施例提供的发光元件的驱动装置，能够获取显示图像，并计算显示图像所需的背光亮度，以根据所述背光亮度从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，即通过选择不同的脉冲来驱动发光元件，达到所述背光亮度，有效提高驱动效率，且降低脉冲输出频率，提高驱动通道的支持数量。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (13)

  1. 一种发光元件的驱动方法，其中，包括：
    获取显示图像；
    计算所述显示图像所需的背光亮度；
    根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件；所述预设的多种脉冲信号的驱动电压或驱动电流不同。
  2. 根据权利要求1所述的发光元件的驱动方法，其中，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
    根据预设的每种脉冲信号的驱动电压或驱动电流，从预设的亮度关系表中查询获得每种脉冲信号对应的亮度；
    根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；
    根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
  3. 根据权利要求1所述的发光元件的驱动方法，其中，所述发光元件包括至少一个LED；
    所述计算所述显示图像所需的背光亮度，具体包括：
    将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
    分别获取每一像素分区的像素灰阶值；
    根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
  4. 根据权利要求3所述的发光元件的驱动方法，其中，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
    根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
  5. 一种发光元件的驱动方法，其中，包括：
    获取显示图像；
    计算所述显示图像所需的背光亮度；
    根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
  6. 根据权利要求5所述的发光元件的驱动方法，其中，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
    从预设的亮度关系表中查询获得预设的每种脉冲信号对应的亮度；
    根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；
    根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
  7. 根据权利要求5所述的发光元件的驱动方法，其中，所述发光元件包括至少一个LED；
    所述计算所述显示图像所需的背光亮度，具体包括：
    将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
    分别获取每一像素分区的像素灰阶值；
    根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
  8. 根据权利要求7所述的发光元件的驱动方法，其中，所述根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件，具体包括：
    根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
  9. 一种发光元件的驱动装置，其中，包括：
    显示图像获取模块，用于获取显示图像；
    背光亮度计算模块，用于计算所述显示图像所需的背光亮度；以及，
    驱动模块，用于根据所述背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动发光元件。
  10. 根据权利要求9所述的发光元件的驱动装置，其中，所述预设的多种脉冲信号的驱动电压或驱动电流不同。
  11. 根据权利要求10所述的发光元件的驱动装置，其中，所述驱动模块具体包括：
    查询单元，用于根据预设的每种脉冲信号的驱动电压或驱动电流，从预设的亮度关系表中查询获得每种脉冲信号对应的亮度；
    选择单元，用于根据所述背光亮度从多种亮度中选择至少一种亮度进行叠加，并计算所选的每种亮度所需叠加的个数；以及，
    驱动单元，用于根据所选的每种亮度及叠加个数向所述发光元件发送相应数量的脉冲信号，以驱动所述发光元件。
  12. 根据权利要求9所述的发光元件的驱动装置，其中，所述发光元件包括至少一个LED；
    所述背光亮度计算模块具体包括：
    划分单元，用于将所述显示图像划分为至少一个像素分区，且所述至少一个像素分区与所述至少一个LED一一对应；
    灰阶值获取单元，用于分别获取每一像素分区的像素灰阶值；以及，
    背光亮度计算单元，用于根据所述像素灰阶值分别计算每一像素分区所需的背光亮度。
  13. 根据权利要求12所述的发光元件的驱动装置，其中，所述驱动模块具体用于：
    根据每一像素分区所需的背光亮度，从预设的多种脉冲信号中选择至少一种脉冲信号来驱动所述像素分区对应的LED。
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