WO2018227653A1 - 背光模组及液晶显示装置 - Google Patents

背光模组及液晶显示装置 Download PDF

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Publication number
WO2018227653A1
WO2018227653A1 PCT/CN2017/089933 CN2017089933W WO2018227653A1 WO 2018227653 A1 WO2018227653 A1 WO 2018227653A1 CN 2017089933 W CN2017089933 W CN 2017089933W WO 2018227653 A1 WO2018227653 A1 WO 2018227653A1
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Prior art keywords
light emitting
blue
emitting unit
unit
saturation
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Ceased
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PCT/CN2017/089933
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English (en)
French (fr)
Inventor
杨勇
杨映保
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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 US15/545,695 priority Critical patent/US10416496B2/en
Publication of WO2018227653A1 publication Critical patent/WO2018227653A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • 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
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • 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
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/851—Wavelength conversion means
    • H10H20/8515—Wavelength conversion means not being in contact with the bodies
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • G02F1/133624—Illuminating devices characterised by their spectral emissions
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight module and a liquid crystal display device.
  • liquid crystal display devices such as mobile phones, computers and televisions have become a necessity in people's lives.
  • the light-emitting diode has gradually become a mainstream light source because of its low heat generation and low power consumption.
  • blue light emitting chips and yellow fluorescent powders are most commonly used as white light emitting diodes.
  • a large number of medical studies have shown that long-term exposure to short-wave blue light with a wavelength below 460 nm can cause damage to the eye and cause lesions. Therefore, reducing short-wave blue light in the liquid crystal display device is advantageous for protecting the health of the user.
  • the inventor of the present application found in the long-term research and development that the short-wave blue light in the short-wavelength liquid crystal display device is currently mainly for preparing anti-blue light glasses, filtering the blue light film on the display, adjusting the blue light ratio by software, or changing the blue light peak through hardware. To achieve, but these methods will lead to loss of brightness, display color yellowing and other issues, affecting the display.
  • the technical problem to be solved by the present invention is to provide a backlight module and a liquid crystal display device capable of selectively achieving low blue light eye protection while maintaining display brightness and chromaticity.
  • a technical solution adopted by the present invention is to provide a backlight module, including: at least one first light emitting unit, the first light emitting unit respectively includes a first blue light emitting chip; and at least one second light emitting unit
  • the second light emitting unit respectively includes a second blue light emitting chip, and a wavelength of an emission peak of the second blue light emitting chip is greater than a wavelength of an emission peak of the first blue light emitting chip; and a control circuit is configured to acquire
  • the backlight module provides blue saturation of a display screen of the backlighted liquid crystal panel, and dynamically adjusts the light emission brightness of the first light emitting unit and the second light emitting unit according to the blue light saturation.
  • the device includes the backlight module described above.
  • the invention provides two kinds of light-emitting units with different emission wavelengths in the backlight module, and dynamically adjusts the output of the short-wave blue light according to the blue-light saturation, and selectively realizes low-light blue-eye protection while maintaining display brightness and chromaticity.
  • FIG. 1 is a schematic structural view of an embodiment of a backlight module of the present invention
  • FIG. 2 is a schematic structural view of a first light emitting unit according to another embodiment of the backlight module of the present invention.
  • FIG. 3 is a schematic structural view of a first light emitting unit according to another embodiment of the backlight module of the present invention.
  • FIG. 4 is a schematic structural view of a second light emitting unit according to another embodiment of the backlight module of the present invention.
  • FIG. 5 is a schematic structural view of another embodiment of a backlight module of the present invention.
  • FIG. 6 is a schematic structural view of still another embodiment of a backlight module of the present invention.
  • FIG. 7 is a schematic structural view of still another embodiment of a backlight module of the present invention.
  • Figure 8 is a schematic view showing the structure of an embodiment of a liquid crystal display device of the present invention.
  • an embodiment of a backlight module of the present invention includes:
  • the wavelength of the emission peak of the light emitting chip 201 is greater than the wavelength of the emission peak of the first blue light emitting chip 101;
  • the first light emitting unit 10 and the second light emitting unit 20 may be an illuminable package such as an LED (Light Emitting Diode).
  • the first light emitting unit 10 and the second light emitting unit 20 may respectively emit light through the first blue light
  • the chip 101 and the second blue light emitting chip 201 cooperate with the fluorescent material to emit white light as a backlight of the backlight module.
  • the blue light generated by the first blue light emitting chip 101 and the second blue light emitting chip 201 respectively excite the respective fluorescent materials to generate excitation light such as green light, red light or yellow light, and is mixed with the remaining blue light by the excitation light. And output white light separately.
  • the first light emitting unit 10 and the second light emitting unit 20 may also cooperate with the fluorescent material through the first blue light emitting chip 101 and the second blue light emitting chip 201, respectively, so that the first light emitting unit 10 and the second light emitting unit At least one of the light emitting units 20 emits a first blue light, at least one of the light emitting units emits a second blue light, at least one of the cells emits green light, and the other of the light emitting units emits red light, and then is mixed by optical elements such as a light guide plate and a diffusion plate. And achieve white light output.
  • the green light emitting chip, the red light emitting chip, or the independent green light emitting unit and the red light emitting unit may be added by the first light emitting unit 10 and the second light emitting unit 20 to realize white light output.
  • the control circuit 30 is configured to acquire the blue saturation of the display screen of the liquid crystal panel provided with the backlight by the backlight module, and dynamically adjust the light emission brightness of the first light emitting unit 10 and the second light emitting unit 20 according to the blue light saturation.
  • control circuit 30 can be integrated on the flexible circuit board to facilitate the installation of the backlight module.
  • two kinds of light emitting units with different emitting wavelengths are disposed in the backlight module, and the output of the short-wave blue light is dynamically adjusted according to the blue saturation, and the low blue light eye is selectively realized while maintaining the display brightness and the chromaticity.
  • another embodiment of the backlight module of the present invention includes:
  • the wavelength of the emission peak of the light emitting chip 201 is greater than the wavelength of the emission peak of the first blue light emitting chip 101;
  • the first illuminating unit 10 and the second illuminating unit 20 are arranged in a straight line to form a side-entry backlight 100, and the reflective sheet 200, the light guide sheet 300, the diffusion sheet 400, and the brightness enhancement film 500 form a backlight module. .
  • the first blue light emitting chip 101 includes a substrate 1011, a buffer layer 1012, a negative electrode 1013, an electron transport layer 1014, a light emitting layer 1015, a hole transport layer 1016, and a positive electrode 1017, and electrons pass through the electron from the negative electrode 1013 under voltage driving.
  • the transport layer 1014 reaches the light-emitting layer 1015, and holes pass from the positive electrode 1017 through the hole transport layer 1016 to the light-emitting layer 1015, and electrons and holes interact in the light-emitting layer 1015 to emit light.
  • the electron transport layer is an N-type semiconductor
  • the light-emitting layer is an indium gallium compound
  • the hole transport layer is a P-type semiconductor.
  • the structure of the second blue light emitting chip 201 is the same as that of the first blue light emitting chip 101, except that the ratio of the indium element to the gallium element of the indium gallium compound of the second blue light emitting chip 201 is larger than that of the indium gallium compound of the first blue light emitting chip 101.
  • the ratio of the indium element to the gallium element is such that the wavelength of the light emitted by the second blue light emitting chip 201 is greater than the wavelength of the light emitted by the first blue light emitting chip 101, wherein the wavelength of the emission peak of the first blue light emitting chip 101 is 440 nm to 455 nm.
  • the wavelength of the emission peak of the second blue light emitting chip 201 is 460 nm to 470 nm.
  • the substrate 1011 may be a material such as sapphire (Al 2 O 3 ), silicon (Si) or silicon carbide (SiC), and the N-type semiconductor may be an N-type gallium nitride (N-GaN) material, an indium gallium compound. It may be a material such as indium gallium nitride (InGaN), indium gallium phosphide (InGaP) or indium gallium arsenide (InGaAs), and the p-type semiconductor may be a P-type gallium nitride (P-GaN) material.
  • Al 2 O 3 aluminum oxide
  • Si silicon
  • SiC silicon carbide
  • the N-type semiconductor may be an N-type gallium nitride (N-GaN) material, an indium gallium compound. It may be a material such as indium gallium nitride (InGaN), indium gallium phosphide (InGaP) or indium gallium ar
  • the first light emitting unit 10 further includes a fluorescent layer 102
  • the second light emitting unit 20 further includes a fluorescent layer 202
  • the fluorescent layer 102 and the fluorescent layer 202 contain a fluorescent material that can be excited by blue light to generate other light.
  • the fluorescent layer 102 includes a first yellow fluorescent material, which is excited by the first blue light emitted by the first blue light emitting chip 101 to generate a first yellow light, and is mixed with the remaining first blue light to emit the first white light
  • the fluorescent layer 202 comprises a second yellow fluorescent material excited by the second blue light emitted by the second blue light emitting chip 201 to generate a second yellow light, which is mixed with the remaining second blue light to emit the second white light;
  • the difference between the difference between the X-axis coordinate values of the white light and the second white light color coordinates and the Y-axis coordinate value is not more than 0.015, so that the light emitted by the first light-emitting unit 10 and the second light-emitting unit 20 is not generated. Large
  • the first lighting units 10 respectively comprise a single first blue light emitting chip 101 or at least two a first blue light emitting chip 101 connected in parallel, that is, a single crystal structure, a twin crystal structure or a polycrystalline structure;
  • the second light emitting unit 20 respectively includes at least two second blue light emitting chips connected in parallel, that is, a twin crystal structure or more
  • the number of the first light emitting unit 10 and the second light emitting unit 20 is 1/2-2, wherein the number of the second blue light emitting chips 201 in the second light emitting unit 20 is greater than the number in the first light emitting unit 10 The number of a blue light emitting chip 101.
  • the backlight module in this embodiment further includes a control circuit 30 for acquiring the blue saturation of the display screen of the liquid crystal panel provided with the backlight by the backlight module, and dynamically adjusting the first illumination unit 10 and the second illumination according to the blue saturation.
  • the brightness of the light emitted by unit 20 is not limited to.
  • control circuit 30 includes a first driving circuit 301 and a second driving circuit 302.
  • the first driving circuit 301 is connected to the first lighting unit 10 for controlling the brightness of the first lighting unit 10 according to the blue saturation.
  • the second driving circuit 302 is connected to the second lighting unit 20 for controlling the brightness of the second lighting unit 20 according to the blue saturation.
  • the control circuit 30 controls the illumination brightness of the first illumination unit 10 and the second illumination unit 20 in the first mode, and the first mode is the control circuit 30.
  • the driving current of one light emitting unit 10 is set to the saturation current of the first light emitting unit 10
  • the driving current of the second light emitting unit 20 is set lower than the saturation current of the second light emitting unit 20 (for example, 1/2 of the saturation current to 2/3);
  • the control circuit 30 controls the illumination brightness of the first illumination unit 10 and the second illumination unit 20 in the second mode, and the second mode is that the control circuit 30 turns off the first illumination unit.
  • the light-emitting brightness of the first light-emitting unit 10 in the first mode is greater than the light-emitting brightness of the first light-emitting unit 10 in the second mode
  • the light-emitting brightness of the second light-emitting unit 20 in the first mode is smaller than the second light-emitting unit.
  • 20 illuminance in the second mode.
  • the illumination brightness effects of the first mode and the second mode described above may be implemented in other manners.
  • the control circuit 30 controls the light-emitting luminances of the first light-emitting unit 10 and the second light-emitting unit 20 in a third mode, and the third mode is that the control circuit 30 sets the first light-emitting unit
  • the driving currents of 10 and the second light emitting unit 20 are respectively set to respective saturation currents.
  • the saturation threshold can be 40%, 50% or 60%, with a preferred value of 50%.
  • control circuit 30 is further configured to receive the external ambient light brightness of the backlight module in real time.
  • the control circuit 30 controls the first light emitting unit 10 and the second light emitting in the third mode.
  • the light-emitting luminance of the unit 20, that is, the driving currents of the first light-emitting unit 10 and the second light-emitting unit 20 are respectively set to respective saturation currents.
  • the brightness threshold can be 1800 lux (lux), 2000 lux or 2200 lux, preferably 2000 lux.
  • two kinds of light-emitting units with different emission wavelengths are disposed in the backlight module, and the output of the short-wave blue light is dynamically adjusted according to the display screen, and the low-light blue-eye protection is selectively realized while maintaining the display brightness and the chromaticity.
  • another embodiment of the backlight module of the present invention includes at least one first light emitting unit 10 , at least one second light emitting unit 20 , and a control circuit 30 in the backlight module embodiment.
  • the first light emitting unit 10 and the second light emitting unit 20 are arranged in a matrix to form a direct type backlight 100, and the reflective sheet 600, the diffusion sheet 700, and the brightness enhancing film 800 constitute a backlight module.
  • two kinds of light-emitting units with different emission wavelengths are disposed in the direct-lit backlight module, and the output of the short-wave blue light is dynamically adjusted according to the blue saturation, the light guide plate is omitted, and the thickness of the backlight module and the loss of the backlight are reduced.
  • the liquid crystal display device embodiment of the present invention includes the backlight module 601 and the display panel 602 disposed above the backlight module 601 .
  • two kinds of light emitting units with different emitting wavelengths are disposed in the backlight module, and the output of the short-wave blue light is dynamically adjusted according to the blue saturation, and the low blue light eye is selectively realized while maintaining the display brightness and the chromaticity.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

背光模组及液晶显示装置，包括至少一设有第一蓝光发光芯片（101）的第一发光单元（10）；至少一设有第二蓝光发光芯片（201）的第二发光单元（20），且第二蓝光发光芯片（201）的发射峰值的波长大于第一蓝光发光芯片（101）的发射峰值的波长；控制电路（30），用于根据蓝光饱和度动态调整第一发光单元（10）和第二发光单元（20）的发光亮度。能够根据蓝光饱和度动态调整短波蓝光的输出量，在保持显示亮度和色度的同时有选择地实现低蓝光护眼。

Description

背光模组及液晶显示装置 【技术领域】
本发明涉及显示技术领域，特别涉及背光模组及液晶显示装置。
【背景技术】
目前，手机、电脑和电视等液晶显示装置已经成为人们生活中的必需品。而在液晶显示装置中，发光二极管因其发热量低、耗电量小等优点，已逐渐成为主流光源。其中，又以蓝光发光芯片搭配黄光荧光粉作为白光发光二极管最为普遍。经过大量医学研究表明，长期暴露在波长低于460nm的短波蓝光下，会对眼睛造成损伤，导致病变。因此，减少液晶显示装置中的短波蓝光有利于保护用户的健康。
本申请的发明人在长期的研发中发现，目前减少短波液晶显示装置中的短波蓝光主要是配制防蓝光眼镜、在显示器上贴滤蓝光膜、通过软件调节蓝光占比，或者通过硬件改变蓝光峰值来实现，但是这些方法会导致亮度损失，显示颜色偏黄等问题，影响显示效果。
【发明内容】
本发明主要解决的技术问题是提供背光模组及液晶显示装置，能够在保持显示亮度和色度的同时有选择地实现低蓝光护眼。
为解决上述技术问题，本发明采用的一个技术方案是提供一种背光模组，包括：至少一第一发光单元，所述第一发光单元分别包括第一蓝光发光芯片；至少一第二发光单元，所述第二发光单元分别包括第二蓝光发光芯片，且所述第二蓝光发光芯片的发射峰值的波长大于所述第一蓝光发光芯片的发射峰值的波长；控制电路，用于获取由所述背光模组提供背光的液晶面板的显示画面的蓝光饱和度，并根据所述蓝光饱和度动态调整所述第一发光单元和第二发光单元的发光亮度。
为解决上述技术问题，本发明采用的另一个技术方案是提供一种液晶显示 装置，包括上述的背光模组。
本发明通过在背光模组中设置两种发射波长不同的发光单元，并根据蓝光饱和度动态调整短波蓝光的输出量，在保持显示亮度和色度的同时有选择地实现低蓝光护眼。
【附图说明】
图1是本发明背光模组一实施例的结构示意图；
图2是本发明背光模组另一实施例的第一发光单元的结构示意图；
图3是本发明背光模组另一实施例的第一发光单元的结构示意图；
图4是本发明背光模组另一实施例的第二发光单元的结构示意图；
图5是本发明背光模组另一实施例的结构示意图；
图6是本发明背光模组又一实施例的结构示意图；
图7是本发明背光模组又一实施例的结构示意图；
图8是本发明液晶显示装置实施例的结构示意图。
【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。
参见图1，本发明背光模组一实施例包括：
至少一第一发光单元10和至少一第二发光单元20，其中，第一发光单元10分别包括第一蓝光发光芯片101；第二发光单元20分别包括第二蓝光发光芯片201，且第二蓝光发光芯片201的发射峰值的波长大于第一蓝光发光芯片101的发射峰值的波长；
可选的，第一发光单元10和第二发光单元20可以是LED(Light Emitting Diode，发光二极管)等可发光的封装体。
可选的，第一发光单元10和第二发光单元20可以分别通过第一蓝光发光 芯片101和第二蓝光发光芯片201与荧光材料配合，发射白光作为背光模组的背光源。具体来说，第一蓝光发光芯片101和第二蓝光发光芯片201所产生的蓝光分别激发各自的荧光材料产生绿光、红光或黄光等激发光，并通过激发光与剩余蓝光进行混光而分别输出白光。
在其他实施例中，第一发光单元10和第二发光单元20还可以分别通过第一蓝光发光芯片101和第二蓝光发光芯片201与荧光材料配合，使第一发光单元10和第二发光单元20中的至少一个发光单元发射第一蓝光，至少一个发光单元发射第二蓝光，至少一个单元发射绿光，而其他发光单元发射红光，并再通过导光板、扩散板等光学元件进行混光而实现白光输出。或者，也可以通过第一发光单元10和第二发光单元20增加绿光发光芯片、红光发光芯片，或者增加独立的绿光发光单元、红光发光单元来实现白光输出。
控制电路30，用于获取由背光模组提供背光的液晶面板的显示画面的蓝光饱和度，并根据蓝光饱和度动态调整第一发光单元10和第二发光单元20的发光亮度。
可选的，控制电路30可以集成于柔性电路板上，以便于背光模组的安装。
本发明实施例通过在背光模组中设置两种发射波长不同的发光单元，并根据蓝光饱和度动态调整短波蓝光的输出量，在保持显示亮度和色度的同时有选择地实现低蓝光护眼。
参见图1至图5，本发明背光模组另一实施例包括：
至少一第一发光单元10和至少一第二发光单元20，其中，第一发光单元10分别包括第一蓝光发光芯片101；第二发光单元20分别包括第二蓝光发光芯片201，且第二蓝光发光芯片201的发射峰值的波长大于第一蓝光发光芯片101的发射峰值的波长；
可选的，第一发光单元10和第二发光单元20呈直线排列，形成侧入式背光源100，与反射片200、导光片300、扩散片400和增亮膜500等构成背光模组。
第一蓝光发光芯片101包括衬底1011、缓冲层1012、负电极1013、电子传输层1014、发光层1015、空穴传输层1016和正电极1017，在电压驱动下，电子从负电极1013穿过电子传输层1014到达发光层1015，空穴从正电极1017穿过空穴传输层1016到达发光层1015，电子和空穴在发光层1015相互作用从而发光。
其中，电子传输层为N型半导体，发光层为铟镓化合物，空穴传输层为P型半导体。第二蓝光发光芯片201的结构与第一蓝光发光芯片101相同，区别在于，第二蓝光发光芯片201的铟镓化合物的铟元素与镓元素的比例大于第一蓝光发光芯片101的铟镓化合物的铟元素与镓元素的比例，使得第二蓝光发光芯片201发出的光的波长大于第一蓝光发光芯片101发出的光的波长，其中，第一蓝光发光芯片101的发射峰值的波长为440nm-455nm，第二蓝光发光芯片201的发射峰值的波长为460nm-470nm。
可选的，衬底1011可以是蓝宝石(Al2O3)、硅(Si)或碳化硅(SiC)等材料，N型半导体可以是N型氮化镓(N-GaN)材料，铟镓化合物可以是铟氮化镓(InGaN)、磷化镓铟(InGaP)或铟砷化镓(InGaAs)等材料，P型半导体可以是P型氮化镓(P-GaN)材料。
第一发光单元10还包括荧光层102，第二发光单元20还包括荧光层202，荧光层102和荧光层202中包含可以被蓝光激发产生其他光的荧光材料。可选的，荧光层102包含第一黄光荧光材料，被第一蓝光发光芯片101发射的第一蓝光激发，产生第一黄光，与剩余第一蓝光进行混光而出射第一白光；可选的，荧光层202包含第二黄光荧光材料，被第二蓝光发光芯片201发射的第二蓝光激发，产生第二黄光，与剩余第二蓝光进行混光而出射第二白光；且第一白光和第二白光色坐标的X轴坐标值之间的差异和Y轴坐标值之间的差异均不大于0.015，以使得第一发光单元10和第二发光单元20发出的光不会产生较大的色偏。
可选的，第一发光单元10分别包括单个第一蓝光发光芯片101或至少两个 并联连接的第一蓝光发光芯片101，即单晶结构、双晶结构或多晶结构；第二发光单元20分别包括至少两个并联连接的所述第二蓝光发光芯片，即双晶结构或多晶结构；第一发光单元10与第二发光单元20的数量比为1/2-2，其中，第二发光单元20内的第二蓝光发光芯片201的数量大于第一发光单元10内的第一蓝光发光芯片101的数量。
本实施例中的背光模组还包括控制电路30，用于获取由背光模组提供背光的液晶面板的显示画面的蓝光饱和度，并根据蓝光饱和度动态调整第一发光单元10和第二发光单元20的发光亮度。
本实施例中，控制电路30包括第一驱动电路301和第二驱动电路302，第一驱动电路301连接第一发光单元10，用于根据蓝光饱和度控制第一发光单元10的发光亮度，第二驱动电路302连接第二发光单元20，用于根据蓝光饱和度控制第二发光单元20的发光亮度。
具体的，当蓝光饱和度小于或等于预设的饱和度阈值时，控制电路30以第一模式控制第一发光单元10和第二发光单元20的发光亮度，第一模式为控制电路30将第一发光单元10的驱动电流设置成第一发光单元10的饱和电流，并将第二发光单元20的驱动电流设置成低于第二发光单元20的饱和电流(例如，饱和电流的1/2到2/3)；当蓝光饱和度大于饱和度阈值时，控制电路30以第二模式控制第一发光单元10和第二发光单元20的发光亮度，第二模式为控制电路30关闭第一发光单元10或将第一发光单元10的驱动电流设置成小于第一发光单元10的饱和电流，并将第二发光单元20的驱动电流设置成第二发光单元20的饱和电流。由此使得第一发光单元10在第一模式下的发光亮度大于第一发光单元10在第二模式下的发光亮度，且第二发光单元20在第一模式下的发光亮度小于第二发光单元20在第二模式下的发光亮度。在其他实施例中，可以通过其他方式实现上述第一模式和第二模式的发光亮度效果。
进一步，当显示画面为白色画面，控制电路30以第三模式控制第一发光单元10和第二发光单元20的发光亮度，第三模式为控制电路30将第一发光单元 10和第二发光单元20的驱动电流分别设置成各自的饱和电流。
可选的，饱和度阈值可以是40％、50％或60％，优选值为50％。
具体的，控制电路30还用于实时接收背光模组的外部环境光亮度，当外部环境光亮度大于预设的亮度阈值时，控制电路30以第三模式控制第一发光单元10和第二发光单元20的发光亮度，即将第一发光单元10和第二发光单元20的驱动电流分别设置成各自的饱和电流。
可选的，亮度阈值可以是1800lux(勒克斯)、2000lux或2200lux，优选值为2000lux。
本发明实施例通过在背光模组中设置两种发射波长不同的发光单元，并根据显示画面动态调整短波蓝光的输出量，在保持显示亮度和色度的同时有选择地实现低蓝光护眼。
参见图6和图7，本发明背光模组又一实施例包括上述背光模组实施例中的至少一第一发光单元10、至少一第二发光单元20和控制电路30。
可选的，第一发光单元10和第二发光单元20呈矩阵排列，形成直下式背光源100，与反射片600、扩散片700和增亮膜800等构成背光模组。
本发明实施例通过在直下式背光模组中设置两种发射波长不同的发光单元，并根据蓝光饱和度动态调整短波蓝光的输出量，省去导光板，减少背光模组的厚度和背光的损失，使发光面更均匀，在保持显示亮度和色度的同时有选择地实现低蓝光护眼。
参见图8，本发明液晶显示装置实施例包括上述的背光模组601以及设置于背光模组601上方的显示面板602。
本发明实施例通过在背光模组中设置两种发射波长不同的发光单元，并根据蓝光饱和度动态调整短波蓝光的输出量，在保持显示亮度和色度的同时有选择地实现低蓝光护眼。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接 运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (20)

  1. 一种背光模组，其中，包括：
    至少一第一发光单元，每一所述第一发光单元包括第一蓝光发光芯片；
    至少一第二发光单元，每一所述第二发光单元包括第二蓝光发光芯片，且所述第二蓝光发光芯片的发射峰值的波长大于所述第一蓝光发光芯片的发射峰值的波长；
    控制电路，用于获取由所述背光模组提供背光的液晶面板的显示画面的蓝光饱和度，并根据所述蓝光饱和度动态调整所述第一发光单元和第二发光单元的发光亮度；
    所述第一蓝光发光芯片的发射峰值的波长为440nm-455nm，所述第二蓝光发光芯片的发射峰值的波长为460nm-470nm；
    当所述蓝光饱和度小于或等于预设的饱和度阈值时，所述控制电路以第一模式控制所述第一发光单元和第二发光单元的发光亮度，当所述蓝光饱和度大于所述饱和度阈值时，所述控制电路以第二模式控制所述第一发光单元和第二发光单元的发光亮度，其中所述第一发光单元在所述第一模式下的发光亮度大于所述第一发光单元在所述第二模式下的发光亮度，且所述第二发光单元在所述第一模式下的发光亮度小于所述第二发光单元在所述第二模式下的发光亮度。
  2. 根据权利要求1所述的背光模组，其中，
    在所述第一模式下，所述控制电路将所述第一发光单元的驱动电流设置成所述第一发光单元的饱和电流，并将所述第二发光单元的驱动电流设置成低于所述第二发光单元的饱和电流；在所述第二模式下，所述控制电路关闭所述第一发光单元或将所述第一发光单元的驱动电流设置成小于所述第一发光单元的饱和电流，并将所述第二发光单元的驱动电流设置成所述第二发光单元的饱和电流。
  3. 根据权利要求1所述的背光模组，其中，
    当所述显示画面为白色画面或所述背光模组的外部环境光亮度大于预设的亮度阈值时，所述控制电路以第三模式控制所述第一发光单元和第二发光单元的发光亮度，在所述第三模式下，所述控制电路将所述第一发光单元和所述第二发光单元的驱动电流分别设置成各自的饱和电流。
  4. 一种背光模组，其中，包括：
    至少一第一发光单元，每一所述第一发光单元包括第一蓝光发光芯片；
    至少一第二发光单元，每一所述第二发光单元包括第二蓝光发光芯片，且所述第二蓝光发光芯片的发射峰值的波长大于所述第一蓝光发光芯片的发射峰值的波长；
    控制电路，用于获取由所述背光模组提供背光的液晶面板的显示画面的蓝光饱和度，并根据所述蓝光饱和度动态调整所述第一发光单元和第二发光单元的发光亮度。
  5. 根据权利要求4所述的背光模组，其中，
    所述第一蓝光发光芯片和第二蓝光发光芯片的发光层分别包括铟镓化合物，其中所述第二蓝光发光芯片的所述铟镓化合物的铟元素与镓元素的比例大于所述第一蓝光发光芯片的所述铟镓化合物的铟元素与镓元素的比例。
  6. 根据权利要求4所述的背光模组，其中，
    所述第一发光单元分别包括单个所述第一蓝光发光芯片或至少两个并联连接的所述第一蓝光发光芯片，所述第二发光单元分别包括至少两个并联连接的所述第二蓝光发光芯片，其中所述第二发光单元内的所述第二蓝光发光芯片的数量大于所述第一发光单元内的所述第一蓝光发光芯片的数量。
  7. 根据权利要求4所述的背光模组，其中，
    所述第一蓝光发光芯片的发射峰值的波长为440nm-455nm，所述第二蓝光发光芯片的发射峰值的波长为460nm-470nm。
  8. 根据权利要求4所述的背光模组，其中，
    所述第一发光单元和所述第二发光单元分别包括由所述第一蓝光发光芯片和第二蓝光发光芯片激发的荧光材料，以使得所述第一发光单元和所述第二发光单元分别出射白光，且所述第一发光单元和所述第二发光单元的白光色坐标的X轴坐标值之间的差异和Y轴坐标值之间的差异均不大于0.015。
  9. 根据权利要求4所述的背光模组，其中，
    所述控制电路包括第一驱动电路和第二驱动电路，所述第一驱动电路用于根据所述蓝光饱和度控制所述第一发光单元的发光亮度，所述第二驱动电路用于根据所述蓝光饱和度控制所述第二发光单元的发光亮度。
  10. 根据权利要求4所述的背光模组，其中，
    当所述蓝光饱和度小于或等于预设的饱和度阈值时，所述控制电路以第一模式控制所述第一发光单元和第二发光单元的发光亮度，当所述蓝光饱和度大于所述饱和度阈值时，所述控制电路以第二模式控制所述第一发光单元和第二发光单元的发光亮度，其中所述第一发光单元在所述第一模式下的发光亮度大于所述第一发光单元在所述第二模式下的发光亮度，且所述第二发光单元在所述第一模式下的发光亮度小于所述第二发光单元在所述第二模式下的发光亮度。
  11. 根据权利要求10所述的背光模组，其中，
    在所述第一模式下，所述控制电路将所述第一发光单元的驱动电流设置成所述第一发光单元的饱和电流，并将所述第二发光单元的驱动电流设置成低于所述第二发光单元的饱和电流；在所述第二模式下，所述控制电路关闭所述第一发光单元或将所述第一发光单元的驱动电流设置成小于所述第一发光单元的饱和电流，并将所述第二发光单元的驱动电流设置成所述第二发光单元的饱和电漉。
  12. 根据权利要求10所述的背光模组，其中，
    当所述显示画面为白色画面或所述背光模组的外部环境光亮度大于预设的亮度阈值时，所述控制电路以第三模式控制所述第一发光单元和第二发光单元 的发光亮度，在所述第三模式下，所述控制电路将所述第一发光单元和所述第二发光单元的驱动电流分别设置成各自的饱和电流。
  13. 一种液晶显示装置，其中，包括背光模组，所述背光模组包括：
    至少一第一发光单元，每一所述第一发光单元包括第一蓝光发光芯片；
    至少一第二发光单元，每一所述第二发光单元包括第二蓝光发光芯片，且所述第二蓝光发光芯片的发射峰值的波长大于所述第一蓝光发光芯片的发射峰值的波长；
    控制电路，用于获取由所述背光模组提供背光的液晶面板的显示画面的蓝光饱和度，并根据所述蓝光饱和度动态调整所述第一发光单元和第二发光单元的发光亮度。
  14. 根据权利要求13所述的液晶显示装置，其中，
    所述第一蓝光发光芯片和第二蓝光发光芯片的发光层分别包括铟镓化合物，其中所述第二蓝光发光芯片的所述铟镓化合物的铟元素与镓元素的比例大于所述第一蓝光发光芯片的所述铟镓化合物的铟元素与镓元素的比例。
  15. 根据权利要求13所述的液晶显示装置，其中，
    所述第一蓝光发光芯片的发射峰值的波长为440nm-455nm，所述第二蓝光发光芯片的发射峰值的波长为460nm-470nm。
  16. 根据权利要求13所述的液晶显示装置，其中，
    所述第一发光单元和所述第二发光单元分别包括由所述第一蓝光发光芯片和第二蓝光发光芯片激发的荧光材料，以使得所述第一发光单元和所述第二发光单元分别出射白光，且所述第一发光单元和所述第二发光单元的白光色坐标的X轴坐标值之间的差异和Y轴坐标值之间的差异均不大于0.015。
  17. 根据权利要求13所述的液晶显示装置，其中，
    所述控制电路包括第一驱动电路和第二驱动电路，所述第一驱动电路用于根据所述蓝光饱和度控制所述第一发光单元的发光亮度，所述第二驱动电路用于根据所述蓝光饱和度控制所述第二发光单元的发光亮度。
  18. 根据权利要求13所述的液晶显示装置，其中，
    当所述蓝光饱和度小于或等于预设的饱和度阈值时，所述控制电路以第一模式控制所述第一发光单元和第二发光单元的发光亮度，当所述蓝光饱和度大于所述饱和度阈值时，所述控制电路以第二模式控制所述第一发光单元和第二发光单元的发光亮度，其中所述第一发光单元在所述第一模式下的发光亮度大于所述第一发光单元在所述第二模式下的发光亮度，且所述第二发光单元在所述第一模式下的发光亮度小于所述第二发光单元在所述第二模式下的发光亮度。
  19. 根据权利要求18所述的液晶显示装置，其中，
    在所述第一模式下，所述控制电路将所述第一发光单元的驱动电流设置成所述第一发光单元的饱和电流，并将所述第二发光单元的驱动电流设置成低于所述第二发光单元的饱和电流；在所述第二模式下，所述控制电路关闭所述第一发光单元或将所述第一发光单元的驱动电流设置成小于所述第一发光单元的饱和电流，并将所述第二发光单元的驱动电流设置成所述第二发光单元的饱和电漉。
  20. 根据权利要求18所述的液晶显示装置，其中，
    当所述显示画面为白色画面或所述背光模组的外部环境光亮度大于预设的亮度阈值时，所述控制电路以第三模式控制所述第一发光单元和第二发光单元的发光亮度，在所述第三模式下，所述控制电路将所述第一发光单元和所述第二发光单元的驱动电流分别设置成各自的饱和电流。
PCT/CN2017/089933 2017-06-12 2017-06-26 背光模组及液晶显示装置 Ceased WO2018227653A1 (zh)

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