WO2018201537A1 - 背光模组、液晶显示器及背光模组驱动控制方法 - Google Patents

背光模组、液晶显示器及背光模组驱动控制方法 Download PDF

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Publication number
WO2018201537A1
WO2018201537A1 PCT/CN2017/085923 CN2017085923W WO2018201537A1 WO 2018201537 A1 WO2018201537 A1 WO 2018201537A1 CN 2017085923 W CN2017085923 W CN 2017085923W WO 2018201537 A1 WO2018201537 A1 WO 2018201537A1
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Prior art keywords
led lamp
white led
lamp group
pwm control
light
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PCT/CN2017/085923
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English (en)
French (fr)
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徐鹏博
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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 US15/546,938 priority Critical patent/US10398002B2/en
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module, a liquid crystal display, and a backlight module driving control method thereof.
  • LEDs Light Emitting Diodes
  • LCD backlights for LED backlights have conquered many users with their thin and environmentally friendly concepts.
  • Liquid crystal display products with LED backlights have gradually become mainstream.
  • the LED used in the backlight used in the existing liquid crystal display has the principle of emitting white light: part of the blue light emitted by the chip is converted into yellow light by the medium; and blue light and yellow light are mixed to generate white light.
  • This kind of LED backlight will yellow after long-term use, which causes the display to have a problem of reduced brightness and yellow color.
  • the object of the present invention is to provide a backlight module with adjustable chromaticity, which can improve the brightness of the backlight module after long-term use, and the color yellowing is poor, thereby improving the display effect.
  • Another object of the present invention is to provide a liquid crystal display using the above backlight module.
  • Another object of the present invention is to provide a backlight module driving control method, which can adjust the chromaticity of the backlight module, improve the brightness of the backlight module after long-term use, and cause yellow color defects, thereby improving the display effect.
  • the invention provides a backlight module, comprising a PWM control circuit, a driving circuit, a first white LED lamp group and a second white LED lamp group, wherein the PWM control circuit is connected to the driving circuit, and the driving circuit is also respectively connected To the first white LED light group and the second white LED light group,
  • the PWM control module is configured to control the driving circuit to drive the first white LED lamp group and the second white LED lamp group to emit light, wherein the first white LED lamp group and the second white LED lamp group have Different shades.
  • the detection unit is further configured to detect light chromaticity information of the first white LED light group and the second white LED light group, and transmit the chromaticity information to a PWM control circuit,
  • the PWM control circuit controls the driving circuit according to the chromaticity information such that the chromaticity of the light after the mixing of the first white LED lamp group and the second white LED lamp group is within a preset threshold range.
  • the PWM control circuit includes a first PWM control module and a second PWM control module that are independent of each other, and the first PWM control module is configured to control the driving circuit to drive the first white LED light group to emit light.
  • the second PWM control module is configured to control the driving circuit to drive the second white LED lamp group to emit light.
  • the first white LED lamp group is a bluish LED lamp group
  • the second white LED lamp group is a yellow LED lamp group.
  • the first white LED lamp group includes a plurality of first white LED lamps arranged in series; and the second white LED lamp group includes a plurality of second white LED lamps arranged in series.
  • the present invention also provides a liquid crystal display comprising a display panel and a backlight module, the backlight module comprising a PWM control circuit, a driving circuit, a first white LED lamp group and a second white LED lamp group, the PWM control circuit and The driving circuit is connected, the driving circuit is further connected to the first white LED lamp group and the second white LED lamp group, respectively, the PWM control module is configured to control the driving circuit to drive the first white LED The lamp group and the second white LED lamp group emit light, wherein the first white LED lamp group and the second white LED lamp group have different chromaticities.
  • the detection unit is further configured to detect light chromaticity information of the first white LED light group and the second white LED light group, and transmit the chromaticity information to a PWM control circuit,
  • the PWM control circuit controls the driving circuit according to the chromaticity information such that the chromaticity of the light after the mixing of the first white LED lamp group and the second white LED lamp group is within a preset threshold range.
  • the PWM control circuit includes a first PWM control module and a second PWM control module that are independent of each other, and the first PWM control module is configured to control the driving circuit to drive the first white LED light group to emit light.
  • the second PWM control module is configured to control the driving circuit Thereby driving the second white LED lamp group to emit light.
  • the first white LED lamp group is a bluish LED lamp group
  • the second white LED lamp group is a yellow LED lamp group.
  • the first white LED lamp group includes a plurality of first white LED lamps arranged in series; and the second white LED lamp group includes a plurality of second white LED lamps arranged in series.
  • the invention also provides a backlight module driving control method, the method comprising:
  • the PWM control circuit sends the PWM modulated signal to the driving circuit
  • the driving circuit generates a first driving signal and a second driving signal according to the PWM modulation signal and outputs to the first white LED lamp group and the second white LED lamp group, respectively, thereby driving the first white LED lamp group and the The second white LED lamp group emits light.
  • the PWM control circuit transmitting the PWM modulation signal to the driving circuit further includes:
  • the detecting unit acquires light chromaticity information of the first white LED light group and the second white LED light group, and transmits the chromaticity information to the PWM control circuit;
  • the PWM control circuit generates a PWM modulated signal according to the chrominance information and sends the PWM modulated signal to the driving circuit;
  • the driving circuit generates a first driving signal and a second driving signal according to the PWM modulation signal and outputs to the first white LED lamp group and the second white LED lamp group, respectively, thereby driving the first white LED lamp group and the The chromaticity of the light after mixing of the second white LED lamp group is within a preset threshold range.
  • the method further includes: pre-establishing a correspondence table between the chrominance change value and the PWM modulation signal pulse width change value, wherein the PWM control circuit is configured according to the correspondence table and the chromaticity information and a median of the preset threshold range The difference value determines a variation value of the PWM modulation signal pulse width, thereby generating the PWM modulation signal.
  • the method further includes setting a chromaticity value of the light after mixing the first white LED lamp group and the second white LED lamp group, and transmitting the chromaticity value to the PWM control circuit, wherein the PWM control circuit is The chrominance value generates a PWM modulated signal and is sent to the drive circuit;
  • the driving circuit generates a first driving signal and a second driving signal according to the PWM modulation signal and outputs to the first white LED lamp group and the second white LED lamp group, respectively, thereby driving the first white LED lamp group and the The chromaticity of the light after mixing of the second white LED lamp group is within a preset threshold range.
  • the light source of the backlight module of the present invention comprises a first white LED lamp group and a second white LED lamp group, and the driving circuit is controlled by a PWM control circuit in the backlight module to drive the first white LED lamp group and the first
  • the two white LED light groups emit light, realize the function of adjusting the light color of the backlight module, and can improve the brightness of the backlight module after long-term use, and the color yellow is bad, and the display effect is improved.
  • FIG. 1 is a structural block diagram of a backlight module according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural view of a liquid crystal display of the present invention.
  • FIG. 3 is a schematic flow chart of a backlight module driving control method according to the present invention.
  • the light source used in the backlight module is typically a white LED.
  • White LED can be mainly divided into Bchip+Y powder (blue chip + yellow phosphor) LED, Bchip+Y ⁇ powder (blue chip + red yellow phosphor) LED, Bchip+RG powder (blue chip + red green phosphor) LED, BGchip+R powder (blue-green chip + red phosphor) LED and RGBchip (red-green blue chip) LED, its color performance is increasing.
  • the color of the backlight module is usually represented by chromaticity and brightness.
  • the chromaticity is used to evaluate the color stimuli, and its value is usually represented by chromaticity coordinates.
  • (x, y) is used to represent a color, which is called chromaticity coordinates.
  • the NTSC National Television Systems Committee
  • the pure white light chromaticity coordinates are (0.33, 0.33), and the yellow light chromaticity coordinates are roughly (0.48, 0.52).
  • FIG. 1 is a structural block diagram of a backlight module according to an embodiment of the present invention.
  • the backlight module 100 of the present invention mainly comprises: a PWM control circuit 10, a driving circuit 30, a first white LED lamp group 41, a second white LED lamp group 42 and a light guide plate (not shown).
  • the light emitted by the first white LED lamp group 41 and the second white LED lamp group 42 is mixed and enters the light guide plate.
  • the backlight module further includes other components, which are not the focus of the present invention and will not be described in detail herein.
  • PWM Pulse Width Modulation
  • the duty ratio of the PWM signal is adjusted within 100%-10%, the linearity is very good, and the efficiency can be improved with respect to the analog dimming mode, and color shift can be avoided when the current changes.
  • the PWM control circuit 10 may include a first PWM control module 21 and a second PWM control module 22 that are independent of each other.
  • the outputs of the first PWM control module 21 and the second PWM control module 22 are respectively connected to two input ends of the driving circuit 30, and the driving circuit 30 further includes a first output end and a second output end. .
  • the first input and output ends are connected to the first white LED lamp group 41.
  • the second output is connected to the second white LED lamp set 42.
  • the PWM control circuit 10 (ie, the first PWM control module 21 and the second PWM control module 22) is equivalent to a switching function.
  • the first PWM control module 21 is configured to control the driving circuit 30 to drive the first white LED lamp group 41 to emit light.
  • the second PWM control module 22 is configured to drive the second white LED lamp group 42 to emit light.
  • the first white LED lamp group 41 and the second white LED lamp group 42 have different chromaticities.
  • the chromaticity coordinates of the light emitted by the first white LED lamp group 41 are greater than the chromaticity coordinates of the white light; the chromaticity coordinates of the light emitted by the second white LED lamp group 42 are smaller than the chromaticity coordinates of the white light.
  • the first white LED lamp group 41 is a bluish LED lamp group, and the second white LED lamp group 42 is a yellow LED lamp group.
  • the first white LED lamp group 41 includes a plurality of first white LED lamps arranged in series. It can be understood that the plurality of first white LED lamps are all bluish; the second white LED group 42 includes a plurality of second white LED lamps arranged in series. It can be understood that the plurality of second White LED lights are yellowish.
  • the light source of the backlight module of the present invention comprises a first white LED lamp group 41 and a second white LED lamp group 42.
  • the driving circuit 30 is controlled by the PWM control circuit 20 in the backlight module to drive the first white LED lamp group.
  • 41 and the second white LED lamp group 42 emit light, thereby realizing the function of adjusting the chromaticity of the backlight module, and improving the brightness of the backlight module after long-term use, and the color yellowing is poor, thereby improving the display effect.
  • the backlight module further includes a detecting unit 10, and the detecting unit 10 is configured to detect the mixed light of the first white LED lamp group 41 and the second white LED lamp group 42.
  • the chrominance information is transmitted to the PWM control circuit 10.
  • the first PWM control module 21 and the second PWM control module 22 respectively output PWM modulation signals to the driving circuit 30, and the first PWM control module 21 and The second PWM control module 22 respectively controls the driving circuit 30 to adjust the lighting states of the first white LED lamp group 41 and the second white LED lamp group 42 such that the first white LED lamp group 41 and the second white light
  • the chromaticity of the light after the LED lamp group 42 is mixed is within a preset threshold range.
  • the median of the preset threshold may be a pure white light chromaticity value.
  • the detecting unit 10 in the present invention may be a sensor module that can be used to directly or indirectly detect the chromaticity value of light.
  • FIG. 2 is a schematic structural view of a liquid crystal display according to the present invention.
  • the present invention also provides a liquid crystal display 500 comprising a display panel 200 and any of the backlight modules 100 mentioned in the above embodiments.
  • the display panel 200 is stacked on the backlight module 100 , and the backlight module 100 is used to provide a backlight for the display panel 200 .
  • the liquid crystal display in the present invention can be applied to, for example, a display terminal such as a mobile phone, a tablet computer, a television, a palmtop computer or the like.
  • FIG. 3 is a schematic flow chart of a backlight module driving control method according to the present invention.
  • the invention also provides a backlight module driving control method, which mainly comprises the following steps:
  • Step S001 The PWM control circuit sends a PWM modulation signal to the driving circuit.
  • the adjustment may be performed by an automatic control method.
  • the backlight module 100 further includes a detecting unit 10.
  • the detecting unit 10 acquires the light color emitted by the first white LED lamp group 41 and the light color of the light emitted by the second white LED lamp group 42 The degree information, the detecting unit 10 transmits the chrominance information to the PWM control circuit 10.
  • the PWM control circuit 10 may include a first PWM control module 21 and a second PWM control module 22 that are independent of each other.
  • the PWM control circuit 10 ie, the first PWM control module 21 and the second PWM control module 22) receives the chrominance information and performs analysis.
  • a correspondence table between the chrominance change value and the PWM modulation signal pulse width change value may be established in advance, and the first PWM control module 21 and the second PWM control module 22 are configured according to the correspondence table and the chromaticity information and the preset threshold range.
  • the difference in the median determines the pulse width variation value of the PWM modulation signal, thereby determining the pulse width of the PWM modulation signal transmitted by the first PWM control module 21 to the driving circuit 30 and the PWM transmitted by the second PWM control module 22 to the driving circuit 30.
  • the pulse width of the modulated signal That is, the PWM control circuit 10 generates a PWM modulation signal based on the chrominance information acquired by the detecting unit 10 and transmits it to the drive circuit 30;
  • Step S002 The driving circuit 30 generates a first driving signal and a second driving signal according to the PWM modulation signal and outputs to the first white LED lamp group 41 and the second white LED lamp group 42 respectively, thereby driving the first The white LED lamp group 41 and the second white LED lamp group 42 emit light.
  • the driving circuit 30 generates a first driving signal according to a pulse width of the PWM modulation signal generated by the first PWM control module 21, and a pulse width of the PWM modulation signal generated by the driving circuit 30 according to the second PWM control module 22.
  • a second driving signal is generated, and the driving circuit 30 outputs the first driving signal to the first white LED lamp group 41, and the second driving signal is output to the second white LED lamp group 42, thereby driving the first white LED lamp group 41.
  • the chromaticity of the light mixed with the second white LED lamp group 42 is within a preset threshold range.
  • the median of the preset threshold may be a pure white light chromaticity value.
  • the detecting unit 10 when the detecting unit 10 detects that the light emitted by the backlight module is yellowish, the detecting unit 10 transmits the detected chromaticity information to the first PWM control module 21 and the second PWM control module 22, the first PWM control.
  • the module 21 and the second PWM control module 22 simultaneously read the pre-stored chrominance change value and the PWM modulation signal pulse width change value correspondence table, thereby increasing the pulse width of the PWM modulation signal transmitted by the first PWM control module 21 to the drive circuit 30. / or reducing the pulse width of the PWM modulated signal transmitted by the second PWM control module 22 to the drive circuit 30.
  • the driving unit receives the PWM modulation signal generated by the PWM control circuit 10 to generate a first driving signal and a second driving signal and outputs to the first white LED lamp group 41 and the second white LED lamp group 42, respectively, thereby controlling the first white light.
  • the chromaticity of the light after mixing of the LED lamp group 41 and the second white LED lamp group 42 is within a preset threshold range. It can be understood that when the detecting unit 10 detects that the light emitted by the backlight module is bluish, the pulse width of the PWM modulation signal transmitted to the driving circuit 30 by the first PWM control module 21 can be reduced and/or the second can be increased.
  • the pulse width of the PWM modulation signal transmitted by the PWM control module 22 to the driving circuit 30 is adjusted to adjust the chromaticity of the light of the first white LED lamp group 41 and the second white LED lamp group 42 to be within a preset threshold range.
  • the driving circuit is controlled by the PWM control circuit, thereby controlling the lighting states of the first white LED lamp group and the second white LED lamp group, thereby realizing the chromaticity adjustment function of the backlight module, which can be improved.
  • the brightness is lowered and the color is yellow, which improves the display effect.
  • a backlight module driving control method is further provided. It mainly includes the following steps:
  • Step S101 The PWM control circuit 10 transmits a PWM modulation signal to the drive circuit 30.
  • the chromaticity value of the light after mixing by the user manually setting the first white LED lamp group 41 and the second white LED lamp group 42 is included.
  • the chromaticity value of the backlight module is set in the setting module of the mobile phone.
  • the setting module of the mobile phone transmits the chrominance value to the PWM control circuit 10, and the PWM control circuit 10 generates a PWM modulated signal according to the chromaticity value and transmits it to the driving circuit 30.
  • Step S102 The driving circuit 30 generates a first driving signal and a second driving signal according to the PWM modulation signal and outputs to the first white LED lamp group 41 and the second white LED lamp group 42 respectively, thereby driving the first The white LED lamp group 41 and the second white LED lamp group 42 emit light.
  • the driving circuit 30 generates a first driving signal and a second driving signal according to the PWM modulation signal and outputs to the first white LED lamp group 41 and the second white LED lamp group 42 respectively, thereby driving the first white LED lamp
  • the chromaticity of the light after mixing of the group 41 and the second white LED lamp group 42 is within a preset threshold range.

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Abstract

一种背光模组（100）、液晶显示器及背光模组（100）驱动控制方法，背光模组（100）包括PWM控制电路（10）、驱动电路（30）、第一白光LED灯组（41）和第二白光LED灯组（42）， PWM控制电路（10）与驱动电路（30）连接，驱动电路（30）还分别连接至第一白光LED灯组（41）和第二白光LED灯组（42）， PWM控制模块（21、22）用于控制驱动电路（30）从而驱动第一白光LED灯组（41）及第二白光LED灯组（42）发光，其中，第一白光LED灯组（41）和第二白光LED灯组（42）具有不同色度。从而，能够实现对背光模组（100）光线色度调节的功能，能够改善背光模组（100）长期使用后亮度降低、色彩发黄的不良，提高显示效果。

Description

背光模组、液晶显示器及背光模组驱动控制方法
本发明要求2017年5月5日递交的发明名称为“背光模组、液晶显示器及背光模组驱动控制方法”的申请号201710313171.3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
本发明涉及显示技术领域，特别是涉及一种背光模组、液晶显示器及其背光模组驱动控制方法。
背景技术
当前，发光二极管(LED，Light Emitting Diode)在液晶显示器背光源领域应用越来越广泛。LED背光源的液晶显示产品以其轻薄和环保的概念征服了很多用户，以LED为背光源的液晶显示产品已逐渐成为主流。
现有的液晶显示器所用的背光所使用的LED，其发出白光的原理是：芯片发出的蓝光一部分通过媒介转变为黄光；蓝光和黄光混和就产生了白光。这种LED背光源在长期使用后会发生黄化，使得显示屏出现亮度降低、色彩发黄的问题。
发明内容
本发明的目的在于提供背光模组，该背光模组的色度可调，能够改善背光模组长期使用后亮度降低、色彩发黄的不良，提高显示效果。
本发明的另一目的在于提供一种采用上述背光模组的液晶显示器。
本发明的另一目的在于提供一种背光模组驱动控制方法，能够调节背光模组的色度，改善背光模组长期使用后亮度降低、色彩发黄的不良，提高显示效果。
为了实现上述目的，本发明实施方式提供如下技术方案：
本发明提供一种背光模组，包括PWM控制电路、驱动电路、第一白光LED灯组和第二白光LED灯组，所述PWM控制电路与所述驱动电路连接，所述驱动电路还分别连接至所述第一白光LED灯组和第二白光LED灯组，所 述PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组及所述第二白光LED灯组发光，其中，所述第一白光LED灯组和第二白光LED灯组具有不同色度。
其中，还包括检测单元，所述检测单元用于检测所述第一白光LED灯组和第二白光LED灯组混合后的光线色度信息并将该色度信息传输至PWM控制电路，所述PWM控制电路根据所述色度信息控制所述驱动电路，从而使得所述第一白光LED灯组和第二白光LED灯组混合后的光线色度位于预设阈值范围内。
其中，所述PWM控制电路包括相互独立的第一PWM控制模块和第二PWM控制模块，所述第一PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组发光，所述第二PWM控制模块用于控制所述驱动电路从而驱动所述第二白光LED灯组发光。
其中，所述第一白光LED灯组为偏蓝LED灯组，所述第二白光LED灯组为偏黄LED灯组。
其中，所述第一白光LED灯组包括多个串联设置的第一白光LED灯；所述第二白光LED灯组包括多个串联设置的第二白光LED灯。
本发明还提供一种液晶显示器，包括显示面板和背光模组，所述背光模组包括PWM控制电路、驱动电路、第一白光LED灯组和第二白光LED灯组，所述PWM控制电路与所述驱动电路连接，所述驱动电路还分别连接至所述第一白光LED灯组和第二白光LED灯组，所述PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组及所述第二白光LED灯组发光，其中，所述第一白光LED灯组和第二白光LED灯组具有不同色度。
其中，还包括检测单元，所述检测单元用于检测所述第一白光LED灯组和第二白光LED灯组混合后的光线色度信息并将该色度信息传输至PWM控制电路，所述PWM控制电路根据所述色度信息控制所述驱动电路，从而使得所述第一白光LED灯组和第二白光LED灯组混合后的光线色度位于预设阈值范围内。
其中，所述PWM控制电路包括相互独立的第一PWM控制模块和第二PWM控制模块，所述第一PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组发光，所述第二PWM控制模块用于控制所述驱动电路 从而驱动所述第二白光LED灯组发光。
其中，所述第一白光LED灯组为偏蓝LED灯组，所述第二白光LED灯组为偏黄LED灯组。
其中，所述第一白光LED灯组包括多个串联设置的第一白光LED灯；所述第二白光LED灯组包括多个串联设置的第二白光LED灯。
本发明还提供一种背光模组驱动控制方法，所述方法包括：
PWM控制电路发送PWM调制信号至驱动电路；
所述驱动电路根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组和第二白光LED灯组，从而驱动所述第一白光LED灯组和所述第二白光LED灯组发光。
其中，所述PWM控制电路发送PWM调制信号至驱动电路还包括：
检测单元获取第一白光LED灯组和第二白光LED灯组混合后的光线色度信息，并将该色度信息传输至所述PWM控制电路；
所述PWM控制电路根据该色度信息产生PWM调制信号并发送至所述驱动电路；以及
所述驱动电路根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组和第二白光LED灯组，从而驱动所述第一白光LED灯组和所述第二白光LED灯组混合后的光线色度位于预设阈值范围内。
其中，所述方法还包括：预先建立色度变化值与PWM调制信号脉宽变化值对应表，所述PWM控制电路根据所述对应表及所述色度信息与预设阈值范围的中位数的差值确定PWM调制信号脉宽的变化值，从而生成所述PWM调制信号。
其中，所述方法还包括设置第一白光LED灯组和第二白光LED灯组后混合后的光线色度值，并将该色度值传输至所述PWM控制电路，所述PWM控制电路根据该色度值产生PWM调制信号并发送至所述驱动电路；以及
所述驱动电路根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组和第二白光LED灯组，从而驱动所述第一白光LED灯组和所述第二白光LED灯组混合后的光线色度位于预设阈值范围内。
本发明实施例具有如下优点或有益效果：
本发明中的背光模组的光源包括第一白光LED灯组和第二白光LED灯组，通过背光模组中的PWM控制电路控制驱动电路从而驱动所述第一白光LED灯组及所述第二白光LED灯组发光，实现对背光模组光线色度调节的功能，能够改善背光模组长期使用后亮度降低、色彩发黄的不良，提高显示效果。
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为本发明一种实施方式的背光模组结构框图。
图2为本发明的液晶显示器结构示意图。
图3为本发明背光模组驱动控制方法流程示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在背光模组中使用的光源通常为白光LED。白光LED可主要分为Bchip+Y粉(蓝光芯片+黄色荧光粉)LED、Bchip+Yσ粉(蓝光芯片+红黄荧光粉)LED、Bchip+RG粉(蓝光芯片+红绿色荧光粉)LED、BGchip+R粉(蓝绿光芯片+红色荧光粉)LED以及RGBchip(红绿蓝光芯片)LED，其色彩表现能力依次递增。
背光模组发光的颜色通常由色度和亮度共同表示，色度用来评价色质刺激，其值通常由色度坐标来表示。一般用(x，y)来表示一种颜色，称之为色度坐标。NTSC(National TelevisionSystems Committee)规定，标准红色色度坐标为(0.67，0.33)，标准绿色色度坐标为(0.21，0.71)，标准蓝色色度坐标为(0.14， 0.08)。纯正的白光色度坐标为(0.33，0.33)，黄光色度坐标大致为(0.48，0.52)。
请结合参阅图1，图1为本发明一种实施方式的背光模组结构框图。本发明的背光模组100主要包括：PWM控制电路10、驱动电路30、第一白光LED灯组41、第二白光LED灯组42和导光板(图未示出)。所述第一白光LED灯组41和所述第二白光LED灯组42发出的光线混合后进入所述导光板。可以理解的是，背光模组还包括其他零组件，因其不是本发明的重点，此处不再详述。
PWM(Pulse Width Modulation，脉冲宽度调制)是通过控制背光电流的通断时间比，从而改变背光电流的有效值，达到改变LED灯组亮度的目的，即背光电流要么处于最大值，要么被关断，PWM信号的占空比在100％-10％内调节时，线性度很好，相对于模拟调光方式能够提高效率，并能避免在电流变化时发生色偏。
所述PWM控制电路10可以包括相互独立的第一PWM控制模块21和第二PWM控制模块22。所述第一PWM控制模块21和所述第二PWM控制模块22的输出端分别与所述驱动电路30的两个输入端连接，所述驱动电路30还包括第一输出端和第二输出端。所述第一输出入端连接至所述第一白光LED灯组41。所述第二输出端连接至所述第二白光LED灯组42。所述PWM控制电路10(即所述第一PWM控制模块21和第二PWM控制模块22)相当于开关作用。其中，所述第一PWM控制模块21用于控制所述驱动电路30从而驱动所述第一白光LED灯组41进行发光。所述第二PWM控制模块22用于驱动所述第二白光LED灯组42进行发光。其中，所述第一白光LED灯组41和第二白光LED灯组42具有不同色度。
进一步具体的，所述第一白光LED灯组41发出的光线的色度坐标大于白光的色度坐标；所述第二白光LED灯组42发出的光线的色度坐标小于白光的色度坐标。优选的，所述第一白光LED灯组41为偏蓝LED灯组，所述第二白光LED灯组42为偏黄LED灯组。
进一步具体的，所述第一白光LED灯组41包括多个串联设置的第一白光LED灯。可以理解的是，所述多个第一白光LED灯均偏蓝；所述第二白光LED灯组42包括多个串联设置的第二白光LED灯。可以理解的是，所述多个第二 白光LED灯均偏黄。
本发明中的背光模组的光源包括第一白光LED灯组41和第二白光LED灯组42，通过背光模组中的PWM控制电路20控制驱动电路30从而驱动所述第一白光LED灯组41及所述第二白光LED灯组42发光，实现对背光模组光线色度调节的功能，能够改善背光模组长期使用后亮度降低、色彩发黄的不良，提高显示效果。
本发明一种可能的实现方式中，所述背光模组还包括检测单元10，所述检测单元10用于检测所述第一白光LED灯组41和第二白光LED灯组42混合后的光线色度信息并将该色度信息传输至PWM控制电路10。所述PWM控制电路10对所述色度信息进行分析处理后，分别由第一PWM控制模块21和第二PWM控制模块22输出PWM调制信号至所述驱动电路30，第一PWM控制模块21和第二PWM控制模块22分别控制所述驱动电路30从而调节所述第一白光LED灯组41和第二白光LED灯组42的发光状态，使得所述第一白光LED灯组41和第二白光LED灯组42混合后的光线色度位于预设阈值范围内。本发明一种可能的实现方式中，所述预设阈值的中位数可以为纯正的白光色度值。
优选的，本发明中的检测单元10可以为能够用于直接或间接检测光线色度值的传感器模组。
请参阅图2，图2为本发明的液晶显示器结构示意图。本发明还提供一种液晶显示器500，包括显示面板200和上述实施例中提到的任意一种背光模组100。所述显示面板200与所述背光模组100层叠设置，所述背光模组100用于为所述显示面板200提供背光源。可以理解的是，本发明中的液晶显示器可以应用于例如，手机、平板电脑、电视机、掌上电脑等显示终端中。
请参阅图3，图3为本发明背光模组驱动控制方法流程示意图。本发明还提供一种背光模组驱动控制方法，主要包括如下步骤：
步骤S001:PWM控制电路发送PWM调制信号至驱动电路。
具体的，本发明一种实施方式中，可以采用自动控制的方法进行调节。例如，背光模组100中还包括检测单元10。所述检测单元10获取第一白光LED灯组41发出的光线及所述第二白光LED灯组42发出的光线混合后的光线色 度信息，检测单元10将该色度信息传输至所述PWM控制电路10。PWM控制电路10可以包括相互独立的第一PWM控制模块21和第二PWM控制模块22。所述PWM控制电路10(即第一PWM控制模块21和第二PWM控制模块22)接收该色度信息后，进行分析。例如，可以预先建立色度变化值与PWM调制信号脉宽变化值对应表，第一PWM控制模块21和第二PWM控制模块22根据所述对应表及所述色度信息与预设阈值范围的中位数的差值确定PWM调制信号的脉宽变化值，进而确定第一PWM控制模块21传输至驱动电路30的PWM调制信号的脉宽及第二PWM控制模块22传输至驱动电路30的PWM调制信号的脉宽。也就是说，所述PWM控制电路10根据检测单元10获取的色度信息产生PWM调制信号并发送至所述驱动电路30；。
步骤S002:所述驱动电路30根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组41和第二白光LED灯组42，从而驱动所述第一白光LED灯组41和所述第二白光LED灯组42发光。
具体的，所述驱动电路30根据第一PWM控制模块21产生的PWM调制信号的脉宽产生第一驱动信号，以及所述驱动电路30根据第二PWM控制模块22产生的PWM调制信号的脉宽产生第二驱动信号，驱动电路30相应将第一驱动信号输出至第一白光LED灯组41，第二驱动信号输出至第二白光LED灯组42，从而驱动所述第一白光LED灯组41和所述第二白光LED灯组42混合后的光线色度位于预设阈值范围内。本发明一种可能的实现方式中，所述预设阈值的中位数可以为纯正的白光色度值。
例如，当检测单元10检测到背光模组发出的光线偏黄时，检测单元10将检测到的色度信息传输至第一PWM控制模块21和第二PWM控制模块22，所述第一PWM控制模块21和第二PWM控制模块22同时读取预存的色度变化值与PWM调制信号脉宽变化值对应表，从而增加第一PWM控制模块21传输至驱动电路30的PWM调制信号的脉宽和/或减小第二PWM控制模块22传输至驱动电路30的PWM调制信号的脉宽。驱动单元接收到PWM控制电路10产生的PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组41和第二白光LED灯组42，从而控制所述第一白光LED灯组41和所述第二白光LED灯组42混合后的光线色度位于预设阈值范围内。 可以理解的是，当检测单元10检测到背光模组发出的光线偏蓝时，可以通过减小第一PWM控制模块21传输至驱动电路30的PWM调制信号的脉宽和/或增大第二PWM控制模块22传输至驱动电路30的PWM调制信号的脉宽来调节所述第一白光LED灯组41和所述第二白光LED灯组42混合后的光线色度位于预设阈值范围内。
本发明的背光模组驱动控制方法中，通过PWM控制电路控制驱动电路，进而控制第一白光LED灯组和第二白光LED灯组的发光状态，实现背光模组的色度调节功能，能够改善背光模组长期使用后亮度降低、色彩发黄的不良，提高显示效果。
本发明另一种可能的实现方式中，还提供一种背光模组驱动控制方法。主要包括如下步骤：
步骤S101:PWM控制电路10发送PWM调制信号至驱动电路30。
具体的，包括用户手动设置第一白光LED灯组41和第二白光LED灯组42后混合后的光线色度值。例如，通过在手机的设置模块中设置背光模组的色度值。手机的设置模块将该色度值传输至所述PWM控制电路10，所述PWM控制电路10根据该色度值产生PWM调制信号并发送至所述驱动电路30。
步骤S102:所述驱动电路30根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组41和第二白光LED灯组42，从而驱动所述第一白光LED灯组41和所述第二白光LED灯组42发光。
所述驱动电路30根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组41和第二白光LED灯组42，从而驱动所述第一白光LED灯组41和所述第二白光LED灯组42混合后的光线色度位于预设阈值范围内。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。而且，描述的具体特征、结构、材料或特点可以在任何的一个或多个实施例或示例中以合适的方式结合。
以上所述的实施方式，并不构成对该技术方案保护范围的限定。任何在上述实施方式的精神和原则之内所作的修改、等同替换和改进等，均应包含在该技术方案的保护范围之内。

Claims (14)

  1. 一种背光模组，其中，包括PWM控制电路、驱动电路、第一白光LED灯组和第二白光LED灯组，所述PWM控制电路与所述驱动电路连接，所述驱动电路还分别连接至所述第一白光LED灯组和第二白光LED灯组，所述PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组及所述第二白光LED灯组发光，其中，所述第一白光LED灯组和第二白光LED灯组具有不同色度。
  2. 如权利要求1所述的背光模组，其中，还包括检测单元，所述检测单元用于检测所述第一白光LED灯组和第二白光LED灯组混合后的光线色度信息并将该色度信息传输至PWM控制电路，所述PWM控制电路根据所述色度信息控制所述驱动电路，从而使得所述第一白光LED灯组和第二白光LED灯组混合后的光线色度位于预设阈值范围内。
  3. 如权利要求2所述的背光模组，其中，所述PWM控制电路包括相互独立的第一PWM控制模块和第二PWM控制模块，所述第一PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组发光，所述第二PWM控制模块用于控制所述驱动电路从而驱动所述第二白光LED灯组发光。
  4. 如权利要求1所述的背光模组，其中，所述第一白光LED灯组为偏蓝LED灯组，所述第二白光LED灯组为偏黄LED灯组。
  5. 如权利要求4所述的背光模组，其中，所述第一白光LED灯组包括多个串联设置的第一白光LED灯；所述第二白光LED灯组包括多个串联设置的第二白光LED灯。
  6. 一种液晶显示器，包括显示面板和背光模组，其中，所述背光模组包括PWM控制电路、驱动电路、第一白光LED灯组和第二白光LED灯组，所述PWM控制电路与所述驱动电路连接，所述驱动电路还分别连接至所述第一白 光LED灯组和第二白光LED灯组，所述PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组及所述第二白光LED灯组发光，其中，所述第一白光LED灯组和第二白光LED灯组具有不同色度。
  7. 如权利要求6所述的液晶显示器，其中，还包括检测单元，所述检测单元用于检测所述第一白光LED灯组和第二白光LED灯组混合后的光线色度信息并将该色度信息传输至PWM控制电路，所述PWM控制电路根据所述色度信息控制所述驱动电路，从而使得所述第一白光LED灯组和第二白光LED灯组混合后的光线色度位于预设阈值范围内。
  8. 如权利要求7所述的液晶显示器，其中，所述PWM控制电路包括相互独立的第一PWM控制模块和第二PWM控制模块，所述第一PWM控制模块用于控制所述驱动电路从而驱动所述第一白光LED灯组发光，所述第二PWM控制模块用于控制所述驱动电路从而驱动所述第二白光LED灯组发光。
  9. 如权利要求6所述的液晶显示器，其中，所述第一白光LED灯组为偏蓝LED灯组，所述第二白光LED灯组为偏黄LED灯组。
  10. 如权利要求9所述的液晶显示器，其中，所述第一白光LED灯组包括多个串联设置的第一白光LED灯；所述第二白光LED灯组包括多个串联设置的第二白光LED灯。
  11. 一种背光模组驱动控制方法，其中，所述方法包括：
    PWM控制电路发送PWM调制信号至驱动电路；
    所述驱动电路根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组和第二白光LED灯组，从而驱动所述第一白光LED灯组和所述第二白光LED灯组发光。
  12. 如权利要求11所述的背光模组驱动控制方法，其中，所述PWM控制电路发送PWM调制信号至驱动电路还包括：
    检测单元获取第一白光LED灯组和第二白光LED灯组混合后的光线色度 信息，并将该色度信息传输至所述PWM控制电路；
    所述PWM控制电路根据该色度信息产生PWM调制信号并发送至所述驱动电路；以及
    所述驱动电路根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组和第二白光LED灯组，从而驱动所述第一白光LED灯组和所述第二白光LED灯组混合后的光线色度位于预设阈值范围内。
  13. 如权利要求12所述的背光模组驱动控制方法，其中，所述方法还包括：预先建立色度变化值与PWM调制信号脉宽变化值对应表，所述PWM控制电路根据所述对应表及所述色度信息与预设阈值范围的中位数的差值确定PWM调制信号脉宽的变化值，从而生成所述PWM调制信号。
  14. 如权利要求11所述的背光模组驱动控制方法，其中，所述方法还包括设置第一白光LED灯组和第二白光LED灯组后混合后的光线色度值，并将该色度值传输至所述PWM控制电路，所述PWM控制电路根据该色度值产生PWM调制信号并发送至所述驱动电路；以及
    所述驱动电路根据所述PWM调制信号产生第一驱动信号和第二驱动信号并分别输出至第一白光LED灯组和第二白光LED灯组，从而驱动所述第一白光LED灯组和所述第二白光LED灯组混合后的光线色度位于预设阈值范围内。
PCT/CN2017/085923 2017-05-05 2017-05-25 背光模组、液晶显示器及背光模组驱动控制方法 Ceased WO2018201537A1 (zh)

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