WO2017096684A1 - Led背光色温调节电路及具有其的显示装置 - Google Patents

Led背光色温调节电路及具有其的显示装置 Download PDF

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Publication number
WO2017096684A1
WO2017096684A1 PCT/CN2016/070241 CN2016070241W WO2017096684A1 WO 2017096684 A1 WO2017096684 A1 WO 2017096684A1 CN 2016070241 W CN2016070241 W CN 2016070241W WO 2017096684 A1 WO2017096684 A1 WO 2017096684A1
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color temperature
led
unit
led backlight
matrix
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French (fr)
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郭星灵
周锦杰
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US14/909,113 priority Critical patent/US9886913B2/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/3413Details of control of colour illumination sources
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01JMEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/46Measurement of colour; Colour measuring devices, e.g. colorimeters
    • G01J3/50Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
    • G01J3/506Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors measuring the colour produced by screens, monitors, displays or CRTs
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0666Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/16Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to the field of liquid crystal display technology, and in particular, to an LED backlight color temperature adjustment circuit and a display device therewith.
  • the invention provides an LED backlight color temperature adjustment circuit, which comprises:
  • a driving unit configured to drive a display panel to display an image
  • An image data extracting unit extracting current display image data of the display panel
  • An image data analyzing unit configured to determine a color temperature of the currently displayed image, and calculate a deviation between a color temperature of the currently displayed image and a standard color temperature
  • LED backlight module including:
  • the control module is electrically connected to the driving chip and the LED backlight module, and is configured to adjust driving currents of the first LED and the second LED according to the color temperature adjustment signal, thereby adjusting a color temperature of the LED backlight module.
  • the image data analyzing unit calculates a grayscale average value of the red sub-pixels in the current display image and a grayscale average value of the blue sub-pixels, and according to the grayscale average value of the red sub-pixels and the gray of the blue sub-pixels.
  • the average value determines the color temperature of the currently displayed image.
  • the plurality of the first LEDs and the plurality of the second LEDs are alternately arranged and arranged in a line.
  • the plurality of the first LEDs and the plurality of the second LEDs are arranged in a matrix and are alternately arranged in a row direction and a column direction of the matrix.
  • the plurality of the first LEDs and the plurality of the second LEDs are only alternately arranged in a row.
  • the control module includes an I2C interface unit, a programmable resistance matrix, and a control unit; the I2C interface unit is configured to communicate with the driving chip to receive the color temperature adjustment signal; the programmable resistance matrix includes a resistor matrix and a second resistor matrix, wherein the first resistor matrix and the second resistor matrix are respectively connected in series with the first LED backlight unit and the second LED backlight unit; the control unit is configured to control the first resistor according to the root color temperature adjustment signal The resistance of the matrix and the second resistor matrix is adjusted to adjust the magnitudes of the driving currents of the first LED and the second LED to control the brightness of the first LED and the second LED accordingly.
  • the first resistor matrix includes a plurality of resistors arranged in parallel, a parallel circuit composed of a plurality of resistors is grounded at one end, and the other end is electrically connected to a cathode of the first LED backlight unit;
  • the anode of the LED backlight unit is electrically connected to a driving voltage.
  • the control module includes an I2C interface unit, a first variable circuit, a second variable resistor, and a control unit; the I2C interface unit is configured to communicate with the driving chip to receive the color temperature adjustment signal The first variable circuit device and the second variable resistor are respectively connected in series with the first LED backlight unit and the second LED backlight unit; the control unit is configured to control the first variable circuit device according to the root color temperature adjustment signal and The resistance of the second variable resistor is adjusted to adjust the magnitudes of the driving currents of the first LED and the second LED to control the brightness of the first LED and the second LED, respectively.
  • the invention also provides a display device comprising a display panel and the LED backlight color temperature adjustment circuit.
  • the LED backlight color temperature adjustment circuit controls the driving currents of the first LED and the second LED having different color temperatures according to the deviation between the current display color temperature and the standard color temperature, so that the color temperature of the LED backlight module can be adjusted, and different color temperature pictures are displayed.
  • the color temperature is automatically adjusted to improve the color performance of the display panel.
  • FIG. 1 is a functional block diagram of an LED backlight color temperature adjustment circuit according to a preferred embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a first resistor matrix, a second resistor matrix, and an LED backlight module of the LED backlight color temperature adjustment circuit shown in FIG. 1.
  • FIG. 3 is a circuit diagram of a control module and an LED backlight module according to another embodiment of the present invention.
  • the invention provides an LED backlight color temperature adjustment circuit, which can be applied to an electronic device having a display panel.
  • the invention provides a soft on-board chip structure, which can be applied to an electronic device having a display panel, such as a mobile phone, a tablet computer, a notebook computer. , LCD monitors, LCD TVs and digital cameras.
  • a display panel such as a mobile phone, a tablet computer, a notebook computer.
  • the driving unit 11 is for driving a display panel to display an image.
  • the image data extracting unit 12 is configured to extract current display image data of the display panel.
  • the current display image data includes at least data such as a red (R) sub-pixel, a green (G) sub-pixel, a blue (B) sub-pixel, and a white (W) sub-pixel.
  • the image data extracting unit 12 may be a buffer.
  • the image data analyzing unit 13 is configured to determine a color temperature of the currently displayed image, and calculate a deviation value between a color temperature of the currently displayed image and a standard color temperature. Specifically, the image data analyzing unit 13 calculates a grayscale average value of the red (R) sub-pixel and a grayscale average value of the blue (B) sub-pixel in the current display image, and according to the grayscale of the red (R) sub-pixel. The average value and the grayscale average of the blue (B) sub-pixels determine the color temperature of the currently displayed image.
  • the color temperature adjusting unit 14 is configured to generate and output a color temperature adjustment signal to the control module 30 according to the deviation value of the color temperature of the current display image from the standard color temperature.
  • the number of the first LED 211 and the second LED 221 in the present embodiment are all four, and are arranged in a matrix of 4 ⁇ 2, and the plurality of first LEDs 211 and the plurality of second LEDs 221 are in a matrix.
  • the row direction and the column direction are alternately set.
  • the control module 30 is configured to adjust the driving current of the LED backlight module 20 according to the color temperature adjustment signal, thereby adjusting the color temperature of the LED backlight module 20.
  • the control module 30 The I2C interface unit 31, the programmable resistance matrix 32 and the control unit 33 are included.
  • the I2C interface unit 31 is for communicating with the drive chip 10 to receive the color temperature adjustment signal.
  • the programmable resistance matrix 32 includes a first resistance matrix 321 and a second resistance matrix 322.
  • the first resistor matrix 321 and the second resistor matrix 322 are connected in series with the first LED backlight unit 21 and the second LED backlight unit 22, respectively.
  • the control unit 33 is electrically connected to the I2C interface unit 31 and the programmable resistance matrix 32 for controlling the resistance of the first resistor matrix 321 and the second resistor matrix 322 according to the root color temperature adjustment signal, thereby adjusting the first LED backlight unit 21 accordingly. And a driving current of the second LED backlight unit 22 to control the brightness of the first LED 211 and the second LED 221 correspondingly.
  • the color temperatures of the first LED 211 and the second LED 221 may increase or decrease correspondingly as their brightness increases or decreases. Since the first LED 211 and the second LED 212 have different color temperatures, the color temperature of the LED backlight module 20 can be adjusted by appropriately controlling the brightness of the first LED 211 and the second LED 212.
  • the current value of the LED with high color temperature in the first LED 211 and the second LED 221 can be increased; when the color temperature to be displayed of the LED backlight module 20 needs to be lowered, At this time, the current value of the LED having a low color temperature in the first LED 211 and the second LED 221 can be increased. It can be understood that, in order to adjust the color temperature of the LED backlight module 20 when the overall brightness of the LED backlight module 20 is constant, when the color temperature of the LED backlight module 20 to be displayed needs to be increased, the LED with high color temperature in the first LED 211 and the second LED 221 can be improved.
  • the first resistor matrix 321 includes a plurality of resistors R1-Rn disposed in parallel, and the parallel circuit composed of the plurality of resistors R1-Rn is grounded at one end and electrically connected to the first LED backlight unit 21 at the other end.
  • a cathode; an anode of the first LED backlight unit 21 is electrically connected to a driving voltage Vcc.
  • one end of the parallel circuit composed of R1-Rn is electrically connected to the driving voltage Vcc, and the other end is electrically connected to the anode of the first LED backlight unit 21; the cathode grounding processing of the first LED backlight unit 21 .
  • the first resistor matrix 321 further includes a plurality of electronic switches K2-Kn, and the plurality of electronic switches K2-Kn are respectively connected in series with the plurality of resistors R2-Rn.
  • the control unit 33 is electrically connected to the electronic switch K2-Kn (specific connection circuit diagram not shown). The control unit 33 controls the resistance of the first resistor matrix 321 by controlling the opening and closing of the electronic switches K2-Kn according to the color temperature adjustment signal.
  • the structure of the second resistor matrix 322 is substantially the same as the structure of the first resistor matrix 321; and the second The connection relationship between the resistance matrix 322 and the second LED backlight unit 21 and the control unit 33 is substantially the same as that of the first resistor matrix 321 and the first LED backlight unit 22 and the control unit 33. Therefore, details are not described herein.
  • the control module 30 may further include a first variable resistor 34 and a second variable resistor 36.
  • the first variable resistor 34 and the second variable resistor 36 replace the first resistance matrix 321 and the second resistance matrix 322, respectively.
  • the control unit 33 can adjust the driving currents of the first LED 211 and the second LED 212 by directly controlling the resistance values of the first variable resistor 34 and the second variable resistor 36 according to the color temperature adjustment signal.
  • the LED backlight color temperature adjustment circuit 100 controls the driving currents of the first LED 211 and the second LED 212 having different color temperatures according to the deviation between the current display color temperature and the standard color temperature, so that the color temperature of the LED backlight module 20 can be adjusted, and the display is different.
  • the color temperature is automatically adjusted when the color temperature picture is displayed, thereby improving the color performance of the display panel.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种LED背光色温调节电路(100)和具有LED背光调节电路的显示装置。LED背光色温调节电路包括驱动芯片(10)、LED背光模块(20)及控制模块(30)。驱动芯片(10)包括:驱动单元(11),用于驱动一显示面板显示图像;图像数据提取单元(12),提取该显示面板的当前显示图像数据;图像数据分析单元(13),用于计算该当前显示图像的色温与一标准色温的偏差值;色温调节单元(14),用于根据该当前显示图像的色温与标准色温的偏差值产生并输出色温调节信号。LED背光模块(20)包括多个同相串联的第一LED(211)及多个同相串联的第二LED(221),第二LED(221)的色温不同于第一LED(211)的色温。控制模块(30)用于根据该色温调节信号调节第一LED(211)及第二LED(221)的驱动电流,从而调节所述LED背光模块(20)的色温。所述LED背光色温调节电路(100)能有效调节色温。

Description

LED背光色温调节电路及具有其的显示装置
本发明要求2015年12月10日递交的发明名称为“LED背光色温调节电路及具有其的显示装置”的申请号201510915529.0的在先申请优先权,上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示技术领域,特别涉及一种LED背光色温调节电路及具有其的显示装置。
背景技术
传统液晶技术中,每个像素点都是由红/绿/蓝(R/G/B)三种颜色的子像素组成的。但是RGBW技术则在R/G/B的基础上,增加了白色(W)的子像素,也就是说RGBW的液晶面板有4种颜色的子像素。多增加一个W像素之后的有益效果是我们屏幕在显示画面的时候画面会更亮,图像颜色会更加鲜艳。
RGB子像素在基板是由相应色阻充当,而W子像素则是由透明的填平材料充当。液晶面板显示的红绿蓝这三种颜色的效果分别由RGB三种色阻和背光来决定,液晶面板显示的白色的效果由两种条件决定,一种是红绿蓝色阻+背光,一种是透明填平材料+背光。在设计产品时,会考量液晶面板的色域(NTSC)和液晶面板的色温及白点色坐标,然而红绿蓝色阻+背光的色温及白点却不等于OC+背光的色温及白点,这可能会导致最后设计生产出来的液晶面板的色温与最初设计的色温相差很大,造成色温及白点色坐标漂移的情况,造成液晶面板色彩表现不佳。
发明内容
本发明的目的在于提供一种LED背光色温调节电路,以解决现有技术中液晶面板色彩表现不佳的技术问题。
本发明提供一种LED背光色温调节电路,其包括:
驱动芯片,包括:
驱动单元,用于驱动一显示面板显示图像;
图像数据提取单元,提取该显示面板的当前显示图像数据;
图像数据分析单元,用于判断该当前显示图像的色温,并计算该当前显示图像的色温与一标准色温的偏差值;及
色温调节单元,用于根据该当前显示图像的色温与标准色温的偏差值产生并输出色温调节信号;
LED背光模块,包括:
第一LED背光单元,包括多个同相串联的第一LED;及
第二LED背光单元,包括多个同相串联的第二LED,第二LED的色温不同于第一LED的色温;
控制模块,电性连接至所述驱动芯片及LED背光模块,用于根据该色温调节信号调节第一LED及第二LED的驱动电流,从而调节所述LED背光模块的色温。
其中,所述图像数据分析单元计算该当前显示图像中红色子像素的灰阶平均值以及蓝色子像素的灰阶平均值,并根据红色子像素的灰阶平均值以及蓝色子像素的灰阶平均值判断当前显示图像的色温。
其中,多个所述第一LED及多个所述第二LED交替设置并呈线性排列。
其中,多个所述第一LED及多个所述第二LED排列成矩阵,且在矩阵的行方向及列方向均交替设置。
其中,多个所述第一LED及多个所述第二LED仅交替排成一列。
其中,所述控制模块包括I2C接口单元、可编程电阻矩阵及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述可编程电阻矩阵包括第一电阻矩阵及第二电阻矩阵,所述第一电阻矩阵及第二电阻矩阵分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一电阻矩阵及第二电阻矩阵的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
其中,所述第一电阻矩阵包括多个并联设置的电阻,多个电阻组成的并联电路一端接地,另一端电性连接至所述第一LED背光单元的阴极;所述第一 LED背光单元的阳极电性连接至一驱动电压。
其中,所述控制模块包括I2C接口单元、第一可变电路器、第二可变电阻器及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述第一可变电路器及第二可变电阻器分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一可变电路器及第二可变电阻器的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
其中,所述图像数据提取单元为一缓冲器。
本发明还提供一种显示装置,包括显示面板,和所述的LED背光色温调节电路。
所述的LED背光色温调节电路根据当前显示色温与标准色温的偏差值控制具有不同色温的第一LED及第二LED的驱动电流,即可对LED背光模块的色温进行调节,在显示不同色温图片时自动调整色温,从而提高了显示面板的色彩表现。
附图说明
为了更清楚地说明本发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地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,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是本发明较佳实施方式的LED背光色温调节电路的功能模块图。
图2是图1所示的LED背光色温调节电路的第一电阻矩阵、第二电阻矩阵及LED背光模块的电路图。
图3是本发明另一实施方式的控制模块与LED背光模块的电路图。
具体实施方式
本发明提供一种LED背光色温调节电路,可应用于具有显示面板的电子设备,本发明提供一种软板上芯片构造,可应用于具有显示面板的电子设备,例如手机、平板电脑、笔记本电脑、液晶显示器、液晶电视及数码相机等。在 本实施例中,以应用于液晶面板为例,阐述本发明的有益效果。
请参阅图1,本发明较佳实施例提供的LED背光色温调节电路100包括驱动芯片10、LED背光模块20以及电性连接至驱动芯片10级LED背光模块20的控制模块30。驱动芯片10包括驱动单元11、图像数据提取单元12、图像数据分析单元13以及色温调节单元14。
驱动单元11用于驱动一显示面板显示图像。
图像数据提取单元12用于提取该显示面板的当前显示图像数据。其中,该当前显示图像数据至少包括红色(R)子像素、绿色(G)子像素、蓝色(B)子像素以及白色(W)子像素等数据。在本实施方式中,图像数据提取单元12可以为一缓冲器(Buffer)。
图像数据分析单元13用于判断该当前显示图像的色温,并计算该当前显示图像的色温与一标准色温的偏差值。具体地,图像数据分析单元13计算该当前显示图像中红色(R)子像素的灰阶平均值以及蓝色(B)子像素的灰阶平均值,并根据红色(R)子像素的灰阶平均值以及蓝色(B)子像素的灰阶平均值判断当前显示图像的色温。
色温调节单元14用于根据该当前显示图像的色温与标准色温的偏差值产生并输出色温调节信号至控制模块30。
LED背光模块20包括第一LED背光单元21及第二LED背光单元22。第一LED背光单元21包括多个同相串联的第一LED211;第二LED背光单元22包括多个同相串联的第二LED221;第一LED211的色温不同于第二LED221的色温。多个第一LED211及多个第二LED221交替设置并呈线性排列。在本实施方式中,多个第一LED211及多个第二LED221排列成矩阵,且在矩阵的行方向及列方向均交替设置。例如,如图1所示,本实施方式的第一LED211及第二LED221的数量均为4个,共同排列成4×2的矩阵,且多个第一LED211及多个第二LED221在矩阵的行方向及列方向均交替设置。
可以理解,在其他实施方式中,多个第一LED211及多个第二LED221可以仅交替排成一列。
控制模块30用于根据该色温调节信号调节LED背光模块20的驱动电流,从而调节LED背光模块20的色温。具体地,在本实施方式中,控制模块30 包括I2C接口单元31、可编程电阻矩阵32及控制单元33。I2C接口单元31用于与驱动芯片10进行通信,从而接收所述色温调节信号。可编程电阻矩阵32包括第一电阻矩阵321及第二电阻矩阵322。第一电阻矩阵321及第二电阻矩阵322分别与第一LED背光单元21及第二LED背光单元22串联。控制单元33电性连接至I2C接口单元31及可编程电阻矩阵32,用于根据根色温调节信号控制第一电阻矩阵321及第二电阻矩阵322的电阻大小,从而相应调节第一LED背光单元21及第二LED背光单元22的驱动电流大小以相应控制第一LED 211及第二LED 221的亮度。而第一LED 211及第二LED 221的色温会随着其亮度的增大或减小而相应增大或减小。由于第一LED211及第二LED212具有不同的色温,通过适当控制第一LED211及第二LED212的亮度,即可达到调节LED背光模块20的色温的目的。例如,当LED背光模块20待显示的色温需增高时,此时可以提高第一LED 211及第二LED 221中色温高的LED的电流值;当LED背光模块20待显示的色温需降低时,此时可以提高第一LED 211及第二LED 221中色温低的LED的电流值。可以理解,为了在LED背光模块20整体光亮度不变的情况下调整其色温,当LED背光模块20待显示的色温需增高时,可以提高第一LED 211及第二LED 221中色温高的LED的电流值,同时降低色温低的LED的电流值;当LED背光模块20待显示的色温需降低时,此时可以提高第一LED 211及第二LED 221中色温低的LED的电流值,同时降低色温高的LED的电流值。
具体地,请参阅图2,第一电阻矩阵321包括多个并联设置的电阻R1-Rn,多个电阻R1-Rn组成的并联电路一端接地,另一端电性连接至第一LED背光单元21的阴极;第一LED背光单元21的阳极电性连接至一驱动电压Vcc。可以理解,在其他实施方式中,R1-Rn组成的并联电路一端电性连接至驱动电压Vcc,另一端电性连接至第一LED背光单元21的阳极;第一LED背光单元21的阴极接地处理。第一电阻矩阵321还包括多个电子开关K2-Kn,多个电子开关K2-Kn分别与多个电阻R2-Rn串联连接。控制单元33电性连接至电子开关K2-Kn(具体连接线路图未示出)。控制单元33通过根据色温调节信号控制电子开关K2-Kn的开闭,即可相应控制第一电阻矩阵321的阻值。
第二电阻矩阵322的结构与第一电阻矩阵321的结构大致相同;且第二电 阻矩阵322与第二LED背光单元21及控制单元33的连接关系与及第一电阻矩阵321与第一LED背光单元22及控制单元33的连接方式大致相同,因此,在此不再赘述。
可以理解,请参图3,在本发明另一实施方式中,控制模块30还可以包括第一可变电阻器34及第二可变电阻器36。在该实施方式中,第一可变电阻器34及第二可变电阻器36分别取代第一电阻矩阵321及第二电阻矩阵322。控制单元33通过根据色温调节信号直接控制第一可变电阻器34及第二可变电阻器36的阻值即可相应调节第一LED211及第二LED212的驱动电流大小。
所述的LED背光色温调节电路100根据当前显示色温与标准色温的偏差值控制具有不同色温的第一LED211及第二LED212的驱动电流,即可对LED背光模块20的色温进行调节,在显示不同色温图片时自动调整色温,从而提高了显示面板的色彩表现。
以上所揭露的仅为本发明较佳实施例而已,当然不能以此来限定本发明之权利范围,本领域普通技术人员可以理解实现上述实施例的全部或部分流程,并依本发明权利要求所作的等同变化,仍属于发明所涵盖的范围。

Claims (20)

  1. 一种LED背光色温调节电路,其特征在于,其包括:
    驱动芯片,包括:
    驱动单元,用于驱动一显示面板显示图像;
    图像数据提取单元,提取该显示面板的当前显示图像数据;
    图像数据分析单元,用于判断该当前显示图像的色温,并计算该当前显示图像的色温与一标准色温的偏差值;及
    色温调节单元,用于根据该当前显示图像的色温与标准色温的偏差值产生并输出色温调节信号;
    LED背光模块,包括:
    第一LED背光单元,包括多个同相串联的第一LED;及
    第二LED背光单元,包括多个同相串联的第二LED,第二LED的色温不同于第一LED的色温;
    控制模块,电性连接至所述驱动芯片及LED背光模块,用于根据该色温调节信号调节第一LED及第二LED的驱动电流,从而调节所述LED背光模块的色温。
  2. 如权利要求1所述的LED背光色温调节电路,其特征在于:所述图像数据分析单元计算该当前显示图像中红色子像素的灰阶平均值以及蓝色子像素的灰阶平均值,并根据红色子像素的灰阶平均值以及蓝色子像素的灰阶平均值判断当前显示图像的色温。
  3. 如权利要求1所述的LED背光色温调节电路,其特征在于:多个所述第一LED及多个所述第二LED交替设置并呈线性排列。
  4. 如权利要求3所述的LED背光色温调节电路,其特征在于:多个所述第一LED及多个所述第二LED排列成矩阵,且在矩阵的行方向及列方向均交替设置。
  5. 如权利要求3所述的LED背光色温调节电路,其特征在于:多个所述第一LED及多个所述第二LED仅交替排成一列。
  6. 如权利要求4所述的LED背光色温调节电路,其特征在于:所述控制 模块包括I2C接口单元、可编程电阻矩阵及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述可编程电阻矩阵包括第一电阻矩阵及第二电阻矩阵,所述第一电阻矩阵及第二电阻矩阵分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一电阻矩阵及第二电阻矩阵的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
  7. 如权利要求5所述的LED背光色温调节电路,其特征在于:所述控制模块包括I2C接口单元、可编程电阻矩阵及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述可编程电阻矩阵包括第一电阻矩阵及第二电阻矩阵,所述第一电阻矩阵及第二电阻矩阵分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一电阻矩阵及第二电阻矩阵的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
  8. 如权利要求6所述的LED背光色温调节电路,其特征在于:所述第一电阻矩阵包括多个并联设置的电阻,多个电阻组成的并联电路一端接地,另一端电性连接至所述第一LED背光单元的阴极;所述第一LED背光单元的阳极电性连接至一驱动电压。
  9. 如权利要求4所述的LED背光色温调节电路,其特征在于:所述控制模块包括I2C接口单元、第一可变电路器、第二可变电阻器及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述第一可变电路器及第二可变电阻器分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一可变电路器及第二可变电阻器的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
  10. 如权利要求1所述的LED背光色温调节电路,其特征在于:所述图像数据提取单元为一缓冲器。
  11. 一种显示装置,包括显示面板,其特征在于:还包括LED背光色温调节电路;LED背光色温调节电路包括:
    驱动芯片,包括:
    驱动单元,用于驱动一显示面板显示图像;
    图像数据提取单元,提取该显示面板的当前显示图像数据;
    图像数据分析单元,用于判断该当前显示图像的色温,并计算该当前显示图像的色温与一标准色温的偏差值;及
    色温调节单元,用于根据该当前显示图像的色温与标准色温的偏差值产生并输出色温调节信号;
    LED背光模块,包括:
    第一LED背光单元,包括多个同相串联的第一LED;及
    第二LED背光单元,包括多个同相串联的第二LED,第二LED的色温不同于第一LED的色温;
    控制模块,电性连接至所述驱动芯片及LED背光模块,用于根据该色温调节信号调节第一LED及第二LED的驱动电流,从而调节所述LED背光模块的色温。
  12. 如权利要求11所述的显示装置,其特征在于:所述图像数据分析单元计算该当前显示图像中红色子像素的灰阶平均值以及蓝色子像素的灰阶平均值,并根据红色子像素的灰阶平均值以及蓝色子像素的灰阶平均值判断当前显示图像的色温。
  13. 如权利要求11所述的显示装置,其特征在于:多个所述第一LED及多个所述第二LED交替设置并呈线性排列。
  14. 如权利要求13所述的显示装置,其特征在于:多个所述第一LED及多个所述第二LED排列成矩阵,且在矩阵的行方向及列方向均交替设置。
  15. 如权利要求13所述的显示装置,其特征在于:多个所述第一LED及多个所述第二LED仅交替排成一列。
  16. 如权利要求14所述的显示装置,其特征在于:所述控制模块包括I2C接口单元、可编程电阻矩阵及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述可编程电阻矩阵包括第一电阻矩阵及第二电阻矩阵,所述第一电阻矩阵及第二电阻矩阵分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一电阻矩阵及第二电阻矩阵的电阻大小,从而相应调节第一LED及第二 LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
  17. 如权利要求15所述的显示装置,其特征在于:所述控制模块包括12C接口单元、可编程电阻矩阵及控制单元;所述12C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述可编程电阻矩阵包括第一电阻矩阵及第二电阻矩阵,所述第一电阻矩阵及第二电阻矩阵分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一电阻矩阵及第二电阻矩阵的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
  18. 如权利要求16所述的显示装置,其特征在于:所述第一电阻矩阵包括多个并联设置的电阻,多个电阻组成的并联电路一端接地,另一端电性连接至所述第一LED背光单元的阴极;所述第一LED背光单元的阳极电性连接至一驱动电压。
  19. 如权利要求14所述的显示装置,其特征在于:所述控制模块包括I2C接口单元、第一可变电路器、第二可变电阻器及控制单元;所述I2C接口单元用于与所述驱动芯片进行通信,从而接收所述色温调节信号;所述第一可变电路器及第二可变电阻器分别与第一LED背光单元及第二LED背光单元串联;所述控制单元用于根据根色温调节信号控制第一可变电路器及第二可变电阻器的电阻大小,从而相应调节第一LED及第二LED的驱动电流大小以相应控制第一LED及第二LED的亮度。
  20. 如权利要求11所述的显示装置,其特征在于:所述图像数据提取单元为一缓冲器。
PCT/CN2016/070241 2015-12-10 2016-01-06 Led背光色温调节电路及具有其的显示装置 Ceased WO2017096684A1 (zh)

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