WO2020083389A1 - 一种液晶显示背光模组 - Google Patents

一种液晶显示背光模组 Download PDF

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Publication number
WO2020083389A1
WO2020083389A1 PCT/CN2019/113406 CN2019113406W WO2020083389A1 WO 2020083389 A1 WO2020083389 A1 WO 2020083389A1 CN 2019113406 W CN2019113406 W CN 2019113406W WO 2020083389 A1 WO2020083389 A1 WO 2020083389A1
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led
blue
light source
leds
red
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English (en)
French (fr)
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杨敏娜
李健林
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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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
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
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    • 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
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    • 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
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    • 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
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    • G—PHYSICS
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    • 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
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    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
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    • 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
    • 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
    • G02F1/133604—Direct backlight with lamps
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
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    • G02F2201/52—RGB geometrical arrangements
    • 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
    • G—PHYSICS
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    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance

Definitions

  • the present disclosure relates to the technical field of LED display, and particularly to a liquid crystal display backlight module.
  • HDR High Dynamic Range
  • high dynamic range technology is beginning to be used more and more, high brightness and high color gamut technology has become a research hotspot in the display industry.
  • the screen displayed by the high-brightness display device has more levels of brightness detail.
  • global dimming is generally used to achieve dynamic control, but for high-brightness screens, such as the reflection of glass in the sun, fireworks in the night sky, etc
  • high-brightness screens such as the reflection of glass in the sun, fireworks in the night sky, etc
  • the backlight design generally considers the partition design of the entire light source scheme, that is, the local dynamic backlight (Local Dimming) technology.
  • the combination of high brightness and high color gamut can display more perfect colors, because the high color gamut display technology has the characteristics of wide number of colors, high color saturation, more vivid colors and beautiful picture quality than ordinary color gamut TVs. If the highlighted screen appears on a display device with a low color gamut, the screen will appear whitish, distorted, and unclear in detail.
  • the present disclosure proposes a liquid crystal display backlight module capable of achieving high brightness and high color gamut display effect, the liquid crystal display backlight module can be combined Global light control technology Global Dimming and local dynamic backlight technology Local Dimming solve the problem of color distortion and low color reproducibility under high-brightness images.
  • the backlight module is a direct type backlight module.
  • the backlight light source of the backlight module is a color light source composed of a red LED, a green LED, a blue LED and a white LED.
  • the light source is partitioned to control each partition independently to realize the backlight area control function.
  • the LED backlight light source includes a plurality of LED light bars arranged on the backplane, and a single LED in each LED light bar is a spaced-apart LED chip including a red LED, a green LED, and a blue LED chip Three-in-one chip and white LED.
  • the red LED, green LED and blue LED chips in the three-in-one chip of the single LED are all electrically connected with a separate circuit for control, and the white LED is also electrically connected with a separate circuit for control To adjust the current of the circuit according to the brightness and color required by the LCD display.
  • the three-in-one chip is a red LED, a green LED, and a blue LED.
  • the three chips are arranged in a triangle on the LED substrate.
  • the LED backlight light source includes a plurality of LED light bars arranged on the backplane, and the single LED in each LED light bar is a red LED, a green LED, a blue LED, or a white LED.
  • Red LEDs, green LEDs, blue LEDs or white LEDs are sequentially arranged on the LED light bar, and each zone contains red LEDs, green LEDs, blue LEDs or white LEDs, so that each zone can be independently controlled to achieve monochrome Red, green, blue or white backlight.
  • the LED backlight light source includes a plurality of LED light bars arranged on the back panel, and the single LED in each LED light bar is a color light source composed of a red LED, a green LED, and a white LED, or A color light source composed of green, blue and white LEDs, or a color light source composed of red, blue LEDs and white LEDs, so that each zone can be independently controlled to achieve a single-color red, green, blue or white backlight.
  • each LED on the LED light bar is controlled by a separate circuit.
  • the red LEDs, green LEDs and blue LEDs all use blue LED excitation light sources
  • the red LEDs are formed by blue LED excitation light sources doped with red quantum dot materials in corresponding lenses
  • the green LEDs are blue LEDs
  • the excitation light source is formed by doping a green quantum dot material in the corresponding lens
  • the blue LED is a blue LED.
  • the excitation light source is formed by a transparent lens.
  • the quantum dot material includes at least one of the following materials: indium phosphide quantum dots, indium arsenide quantum dots, gallium arsenide quantum dots, zinc sulfide quantum dots, zinc selenide quantum dots, Perovskite quantum dot material.
  • the blue LED excitation light source may be replaced with a violet LED excitation light source.
  • the blue LED excitation light source is composed of a blue LED, a quantum dot lens, and a reflective sheet.
  • the partition number when the color light source is partitioned, when the partition number is 1, it is global light control, and when the partition number is greater than 1, it is a local dynamic backlight.
  • each partition should contain red LEDs, green LEDs, blue LEDs, and white LEDs, and multiple LEDs of the same color in each partition are connected to each other.
  • the liquid crystal display backlight module of the present disclosure uses an RGB color light source as the backlight source in the backlight source, combining global light control technology and local dynamic backlight technology to achieve high brightness and high color gamut Combined dynamic color gamut technology.
  • the backlight LED light source can be illuminated regionally, which is completely white with the traditional LED white light. Compared with the high-brightness solution, it can greatly reduce energy consumption.
  • quantum dot red LEDs, quantum dot green LEDs, and quantum dot blue LED light sources can be used to form backlights, or high-frequency LED light sources, such as purple LED light sources, to excite red, green, and blue Color quantum dot lens realizes high color gamut display.
  • FIG. 1 is a schematic diagram of a cross-sectional structure principle of a liquid crystal display backlight module of the present disclosure.
  • FIG. 2 is a schematic diagram showing the principle of the arrangement structure of the back panel LED light bar of a liquid crystal display backlight module of the present disclosure.
  • FIG. 3 is a schematic structural diagram of a preferred embodiment 1 of a liquid crystal display backlight module of the present disclosure.
  • FIG. 4 is a schematic diagram of an enlarged structural principle of a single LED chip in FIG. 3.
  • FIG. 5 is a schematic structural diagram of a preferred embodiment 2 of a liquid crystal display backlight module of the present disclosure.
  • FIG. 6 is a schematic diagram of the principle structure of the quantum dot lens light source of the present disclosure.
  • the backlight module is one of the key components of the LCD panel.
  • the function is to provide sufficient brightness and uniformly distributed light sources so that it can display images normally.
  • the so-called backlight (BackLight) is a light source for LCD display, and its luminous effect will directly affect the visual effect of the LCD module.
  • the cost of the backlight source accounts for 30-50% of the LCD module, and the power consumed accounts for 75% of the module.
  • EL EL
  • CCFL CCFL
  • LED Depending on the location of the light source, they are divided into side-lit and direct-lit (bottom-backlit).
  • high brightness and high color gamut technology has become a hotspot in the display industry.
  • the combination of high brightness and high color gamut can display more perfect colors.
  • the high color gamut display technology has the characteristics of wide color quantity, high color saturation, more vivid colors and brighter picture quality than ordinary color gamut TV. If a bright picture appears on a display device with a low color gamut, the screen will appear white, the color is distorted, and the specific details and colors cannot be seen clearly. The problem of low color gamut is not yet a good solution .
  • the liquid crystal display backlight module of the present disclosure is a direct type backlight module.
  • the direct-type backlight module mainly includes an optical film group 101, a diffusion plate 102, a reflection sheet and a back plate 103, an LED light bar 104 and The lens 105 is composed.
  • the light source used in the conventional direct-type backlight scheme is an LED white light source, that is, the LED light arranged on the LED light bar 104 is a white LED light source.
  • FIG. 2 is a schematic diagram showing the principle of the arrangement structure of the back panel LED light bar of the liquid crystal display backlight module.
  • the LED light bar 201 is evenly arranged on the reflective sheet and the back board 202.
  • 203 is evenly arranged on the LED light bar.
  • the LED lamp 203 used in the liquid crystal display backlight module of the present disclosure adopts a color light source composed of red LED, green LED, blue LED and white LED, and partitions the color light source to Each zone is independently controlled to realize the backlight area control function.
  • the display device can take into account the color details when displaying a high-brightness picture, that is, in a high-brightness scene, the color reproducibility will not be reduced, and the phenomenon of high-brightness distortion pictures will not appear, and through the color light source Global Dimming and Local Dimming technology can also greatly improve the picture contrast and achieve energy saving effect.
  • the LED backlight light source of the backlight module includes a plurality of LED light bars 301 arranged on the back plate 302, and the present disclosure is preferably implemented Example 1:
  • a single LED in a number of LED light bars 301 in an LED backlight light source of a backlight module includes an LED lamp including a three-in-one chip 303 and a white LED 304 of a red LED, a green LED, and a blue LED chip.
  • the integrated chip 303LED and the white LED 304 are evenly arranged on the LED light bar 301, and the LED light bar 301 is evenly distributed on the backplane 302.
  • the principle structure diagram of a three-in-one chip 303 LED including a red LED, a green LED, and a blue LED chip is shown in FIG. 4.
  • the three chips of red LED 3031, green LED 3033, and blue LED 3032 are arranged in a triangle on the LED substrate On the 3034, the red LED 3031, green LED 3033 and blue LED 3032 are controlled by separate circuits.
  • the current and other parameters of the independent circuit are adjusted according to the required brightness and color.
  • the three-in-one LED lamp Can display pure white.
  • the effect of adding white LEDs in the first preferred embodiment is to increase the backlight brightness and improve energy efficiency.
  • the partition number when the partition number is equal to 1, it is the Global Dimming control mode. At this time, all three-in-one chips 303 are connected with red LEDs, all green LEDs, or all blue LEDs. Through backlight algorithm adjustment, Global Dimming control can be achieved.
  • the partition is greater than 1, it is the Local Dimming control method. The more partitions, the higher the contrast; at this time, connect multiple LEDs of the same color in each partition, that is, multiple red LEDs in the partition The multiple blue LEDs in the connection and partition are connected to each other and the multiple green LEDs are connected to each other.
  • the number of partitions is selected as the number of LEDs of the entire backlight light source, at this time, each LED lamp is independently switched on and off.
  • the red chip at that position lights up to form a Local Dimming control effect .
  • the best backlight algorithm can choose to use four LEDs as a partition.
  • all the red chips at that position will light up and output a red signal at the same time, and the effect of Local Dimming is better.
  • the above four LEDs can include a white LED.
  • the white LED When the corresponding position needs to display a red signal, all the red chips at the position simultaneously light up to output a red signal, and the white LED also lights up, which can achieve an ultra-high brightness red signal The display effect is better.
  • the implementation method of the backlight display in other colors is also the same, which will not be repeated here.
  • the red LED 3031, green LED 3033 and blue LED 3032 of the three-in-one chip 303 in the LED backlight light source of the backlight module can select blue LED excitation light sources, and the red LED 3031 is a blue LED
  • the excitation light source is doped with red quantum dot material in the corresponding lens.
  • the green LED 3033 is formed by doping green quantum dot material in the corresponding lens.
  • the blue LED 3032 is formed by a transparent lens for the blue LED excitation light source.
  • the principle structural diagram of the blue LED excitation light source is shown in the schematic structural diagram of the quantum dot lens light source of the present disclosure in FIG. 6, which is composed of a blue LED 501, a quantum dot lens 502 and a reflection sheet 503.
  • LED excitation light source blue LED501 can choose high-frequency LED light source according to need, such as violet LED light source.
  • the quantum dot material on the quantum dot lens 502 is selected according to the desired color.
  • the number of partitions can be selected according to the actual needs. For example, four three-in-one chips 303LED lights are used as a partition. When a red signal appears here, four of the red chips light up at the same time Red signal. Generally speaking, the more partitions, the higher the cost.
  • the number of partitions is the number of LED lights. That is, each lamp has an independent switch, and the chip in each lamp is also an independent switch, and each chip switches according to different input signals. For example, when a red signal needs to be displayed here, the red chip at this position lights up. This creates a colorful Local Dimming effect.
  • FIG. 5 is a schematic diagram showing the structure and principle of a second preferred embodiment of a liquid crystal display backlight module of the present disclosure.
  • the LED backlight light source used in the backlight module includes a plurality of LED light bars 401 arranged on the back plate 402, and the single LED in each LED light bar 401 is a red LED 403, a green LED 405, a blue LED 404, or a white LED 406, the red LED403, green LED405, blue LED404, and white LED406 are sequentially arranged on the LED light bar 401, and each zone includes red LED, green LED, blue LED, and white LED, red LED403, green LED405, blue LED404, The position of the white LED406 can also be adjusted according to actual needs.
  • each red LED, green LED or blue LED is lit individually, and the backlight algorithm can be adjusted to achieve Global Dimming control.
  • the partition is greater than 1, it is the Local Dimming control method.
  • each LED light Independent switch control for example, with red LED, green LED, blue LED and white LED as a partition, when a red signal needs to be displayed at a certain display position, the red LED in the partition lights up and outputs a red signal to form a local dimming control effect .
  • the white LED added in the second preferred embodiment can also improve energy efficiency, that is, when the red LED is lit and the red signal is output, the white LED is also lit to realize the ultra-high brightness red signal.
  • the red LED can be controlled separately from the white LED.
  • the Global Dimming or Local Dimming control effect can be achieved, or the red LED or the white LED can be controlled separately to achieve the Global Dimming or Local Dimming control effect.
  • the control can be realized according to the actual needs of the display.
  • the green LED or the blue LED plus the white LED can also achieve the Global Dimming or Local Dimming control effect of the red LED plus the white LED.
  • the red LED 403, the green LED 405, or the blue LED 404 of the individual LEDs in each LED light bar 401 in the LED backlight light source of the backlight module can be selected as blue LED excitation light sources.
  • the red LED403 is a blue LED excitation light source doped with red quantum dot material in the corresponding lens
  • the green LED405 is a blue LED excitation light source doped with green quantum dot material in the corresponding lens
  • the blue LED404 is a blue LED excitation light source using transparent Lens formation.
  • the principle structural diagram of the blue LED excitation light source is shown in the schematic structural diagram of the quantum dot lens light source of the present disclosure shown in FIG.
  • This third embodiment is a technical means that can be compromised in consideration of cost. It is implemented on the basis of the preferred embodiment 1.
  • the LED of the three-in-one chip in the preferred embodiment 1 is changed to the LED of the two-in-one chip.
  • the LED backlight light source includes several LED light bars arranged on the back panel, and the single LED in each LED light bar is a color light source composed of red LEDs, green LEDs and white LEDs, or composed of green, blue and white LEDs A color light source, or a color light source composed of red, blue, and white LEDs, so that each zone can be independently controlled to achieve a single-color red, green, blue, or white backlight.
  • a red LED and a green LED form a two-in-one chip LED and a white LED color light source
  • a green LED and a blue LED form a two-in-one chip LED and white LED color light source
  • a red LED The two-in-one chip LED composed of blue LED and the color light source composed of white LED are used for backlight control adjustment, because the red LED, green LED or green LED, blue LED or red LED, blue LED in the two-in-one ,
  • the white LED have separate circuits to control, the combination of two-in-one chip LED and white LED can achieve backlight control.
  • the working principle is the same as that of the first preferred embodiment, which will not be repeated here.
  • the red LED, green LED and blue LED can also be implemented with blue LED excitation light sources and corresponding lenses as in the first preferred embodiment. It is also completely the same as that in the above-mentioned preferred embodiment 1, which will not be repeated here.

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Abstract

一种液晶显示背光模组，背光模组为直下式背光模组，背光模组的LED背光光源为红色LED、绿色LED、蓝色LED和白色LED组成的彩色光源，红色LED、绿色LED和蓝色LED还可采用量子点材料LED或高频LED光源激发红、绿、蓝色量子点透镜，彩色光源中的单颗LED可采用二芯或三芯合一的芯片（303），或单独采用红色（403）、绿色（405）、蓝色LED（404）、白色LED（406），各色LED都电连接有单独的控制电路，通过对彩色光源进行分区来对各分区进行独立控制，实现背光区域控制功能，从而实现全局或区域性点亮背光LED光源，可降低能耗，在色域要求高的场合，采用量子点LED光源来形成背光源，或者采用高频LED光源来激发红、绿、蓝色量子点透镜实现高色域的显示。

Description

一种液晶显示背光模组 技术领域
本公开涉及LED显示技术领域，尤其涉及一种液晶显示背光模组。
背景技术
目前，在液晶显示技术领域，HDR(High Dynamic Range)高动态范围技术开始越来越多被使用，高亮度和高色域技术成为了显示行业研究的热点。高亮度显示设备所显示的画面更加具有亮度细节层次，目前一般选择用全局控光技术(Global Dimming)实现动态控制，但对于高亮度的画面，如玻璃在阳光下的反光，夜空中的烟花等，在显示画面中一般都不是整个显示画面的高亮，而是短时间、小面积的超高亮度。为了实现这种效果，背光设计时一般会考虑对整个光源方案进行分区设计，即局部动态背光(Local Dimming)技术。高亮度与高色域的结合才能显示更完美的色彩，因为高色域显示技术具有色彩数量广、色彩饱和度高、颜色较普通色域的电视更加生动、画质靓丽的特点。如果高亮的画面出现在色域不高的显示设备上时，会出现画面颜色发白、色彩失真、细节颜色不清楚的现象。
因此，现有技术还有待于改进和发展。
发明内容
鉴于上述现有技术的不足之处，本公开为解决现有技术缺陷和不足，提出了一种能够实现高亮度、高色域显示效果的液晶显示背光模组，该液晶显示背光模组能够结合全局控光技术Global Dimming和局部动态背光技术Local Dimming解决高亮度画面下色彩失真、色重现度低的问题。
本公开解决技术问题所采用的技术方案如下：
一种液晶显示背光模组，所述背光模组为直下式背光模组，所述背光模组的LED背光光源为红色LED、绿色LED、蓝色LED和白色LED组成的彩色光源，并对彩色光 源进行分区，以对各分区进行独立控制实现背光区域控制功能。
作为一种改进技术方案，所述LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为间隔设置的包含红色LED、绿色LED和蓝色LED芯片的三芯合一的芯片和白色LED。
作为一种改进技术方案，所述单颗LED中三芯合一芯片中的红色LED、绿色LED和蓝色LED芯片都电连接有单独的电路进行控制，白色LED也电连接单独的电路进行控制，以根据液晶显示画面所需的亮度和颜色调整电路的电流。
作为一种改进技术方案，所述三芯合一的芯片为红色LED、绿色LED和蓝色LED三个芯片呈三角形设置在LED基板上。
作为一种改进技术方案，所述LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为红色LED、绿色LED、蓝色LED或白色LED，所述红色LED、绿色LED、蓝色LED或白色LED依序排布在LED灯条上，各分区均包含有红色LED、绿色LED、蓝色LED或白色LED，以使各分区能够独立控制实现单色的红色、绿色、蓝色或白色背光。
作为一种改进技术方案，所述LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为红色LED、绿色LED和白色LED组成的彩色光源，或者为绿色、蓝色和白色LED组成的彩色光源，或者为红色、蓝色LED和白色LED组成的彩色光源，以使各分区能够独立控制实现单色的红色、绿色、蓝色或白色背光。
作为一种改进技术方案，所述LED灯条上的各LED均由单独的电路进行控制。
作为一种改进技术方案，所述红色LED、绿色LED和蓝色LED均采用蓝光LED激发光源，红色LED为蓝光LED激发光源在对应的透镜中掺杂红色量子点材料形成，绿色LED为蓝光LED激发光源在对应的透镜中掺杂绿色量子点材料形成，蓝色LED为蓝光LED激发光源采用透明的透镜形成。
作为一种改进技术方案，所述量子点材料至少包括以下材料中的一种：磷化铟量子点、砷化铟量子点、砷化镓量子点、硫化锌量子点、硒化锌量子点、钙钛矿量子点材料。
作为一种改进技术方案，所述蓝光LED激发光源可替换为紫光LED激发光源。
作为一种改进技术方案，所述蓝光LED激发光源由蓝光LED、量子点透镜以及反射片构成。
作为一种改进的技术方案，对彩色光源进行分区时，分区数为1时，为全局控光，分区数大于1时为局部动态背光。
作为一种改进技术方案，当分区数等于1时，所有红色LED相连接、所有绿色LED相连接，以及所有蓝色LED相连接，并通过背光算法控制点亮。
作为一种改进技术方案，当分区数大于1时，每个分区中均应同时包含红色LED、绿色LED、蓝色LED和白色LED，并且每个分区中颜色相同的多个LED相互连接。相比现有技术仅采用LED白光作为背光源，本公开液晶显示背光模组在背光源中采用RGB彩色光源作为背光源，结合全局控光技术和局部动态背光技术来实现高亮度、高色域结合的动态色域技术。通过对彩色背光源进行分区，以分区区域内容进行独立控制，实现彩色Global Dimming和Local Dimming效果，在需要高亮度高色彩饱和度时实现区域性点亮背光LED光源，与传统LED白光全白场高亮度的方案相比，可大大降低能耗。在色域要求特别高的场合，可以采用量子点红色LED、量子点绿色LED和量子点蓝色LED光源来形成背光源，或者采用高频LED光源，如紫色LED光源来激发红、绿、蓝色量子点透镜实现高色域的显示。
附图说明
图1是本公开一种液晶显示背光模组的截面结构原理示意图。
图2是本公开一种液晶显示背光模组的背板LED灯条排布结构原理示意图。
图3是本公开一种液晶显示背光模组优选实施例一的结构原理示意图。
图4是图3中单颗LED芯片的放大结构原理示意图。
图5是本公开一种液晶显示背光模组优选实施例二的结构原理示意图。
图6是本公开量子点透镜光源原理结构示意图。
具体实施方式
为使本公开的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本公开进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本公开，并不用于限定本公开。
背光模组为液晶显示器面板的关键零组件之一。功能在于供应充足的亮度与分布均匀的光源，使其能正常显示影像。所谓背光源(BackLight)是液晶显示器显示的一种光源，它的发光效果将直接影响到液晶显示模块视觉效果。背光源性能的好坏除了会直接影响LCD显像质量外，背光源的成本占LCD模块的30-50％，所消耗的电力更占模块的75％，可说是LCD模块中相当重要的零组件。目前主要有EL、CCFL及LED三种背光源类型，依光源分布位置不同则分为侧光式和直下式(底背光式)。主要由光源、导光板、光学用膜片、塑胶框等组成。随着HDR技术到来，高亮度和高色域技术成为显示行业研究的热点。高亮度与高色域的结合才能显示更完美的色彩。因为高色域显示技术具有色彩数量广、色彩饱和度高、颜色较普通色域的电视更加生动、画质亮丽的特点。高亮的画面如果出现在色域不高的显示设备上，则会出现画面颜色发白、色彩失真、看不清具体细节颜色的现象，色域不高的问题目前还没有太好的解决方案。
本公开所述液晶显示背光模组为直下式背光模组。如图1是本公开一种液晶显示背光模组的截面结构原理示意图所示，直下式背光模组主要由光学膜片组101、扩散板102、反射片及背板103、LED灯条104和透镜105组成。传统直下式背光方案所用的光源为LED白光光源，即LED灯条104上所布设的LED灯为白色的LED光源。灯条的排布方式如图2本公开一种液晶显示背光模组的背板LED灯条排布结构原理示意图所示，LED灯条201被均匀布设在反射片及背板202上，LED灯203均匀地排列在LED灯条上。为解决色域不高的问题，本公开所述液晶显示背光模组采用的LED灯203采用红色LED、绿色LED、蓝色LED和白色LED组成的彩色光源，并对彩色光源进行分区，以对各分区进行独立控制实现背光区域控制功能。使显示设备在显示高亮度画面时可兼顾颜色细节，即在高亮度场景中，其颜色的重现度不会降低，不会出现高亮度失真画面的现象，且通过彩色光源的Global Dimming和Local Dimming技术，还能大大提高画面对比度，实现节能效果。
实施例一：
具体如图3本公开一种液晶显示背光模组优选实施例一的结构原理示意图所示，背光模组的LED背光光源包括排布在背板302上的若干LED灯条301，本公开优选实施例一背光模组的LED背光光源中若干LED灯条301中的单颗LED采用的LED灯包含红色LED、绿色LED和蓝色LED芯片的三芯合一的芯片303和白色LED304，该三芯合一的芯片303LED和白色LED304均匀地排列在LED灯条301上，LED灯条301则均匀地分布在背板302上。包含红色LED、绿色LED和蓝色LED芯片的三芯合一的芯片303的LED的原理结构图如图4所示，由红色LED3031、绿色LED3033和蓝色LED3032三个芯片呈三角形设置在LED基板3034上，红色LED3031、绿色LED3033和蓝色LED3032都有单独的电路进行控制，根据所需的亮度和颜色调整独立电路的电流等参数，当调整到合适的配比时，三芯合一LED灯可显示纯白色。虽然三芯合一的LED灯可以显示纯白色，但是本优选实施例一中增加白色LED的作用在于提高背光亮度，提高能效。
设置背光分区时，当分区数等于1时，为Global Dimming的控制方式，此时，所有三芯合一的芯片303中红色LED相连接、所有绿色LED相连接、或所有蓝色LED相连接，通过背光算法调整，可实现Global Dimming控制。当分区大于1时，则为Local Dimming的控制方式，分区数越多，对比度则越高；此时，将每一分区中颜色相同的多个LED相互连接，即分区中的多个红色LED相互连接、分区中的多个蓝色LED相互相连接以及多个绿色LED相互连接。当选择分区数为整个背光光源的LED数量时，此时，每颗LED灯均独立开关控制，当某显示位置需要显示红色信号时，该位置处的红色芯片点亮，即形成Local Dimming控制效果。当然，最佳的背光算法可选择以四颗LED为一个分区，当相应位置需要显示红色信号时，则该位置处的所有红色芯片同时点亮输出红色信号，Local Dimming的效果更佳。以上四颗LED可包含一颗白色LED，当相应位置需要显示红色信号时，该位置处的所有红色芯片同时点亮输出红色信号，同时白色LED也点亮，可实现超高亮度的红色信号，显示效果更好。同理，其他颜色的背光显示实现方法也相同，此处不赘述。
如果对色域要求特别高，则所述背光模组的LED背光光源中的三芯合一的芯片303的红色LED3031、绿色LED3033和蓝色LED3032均可选择蓝光LED激发光源，红色LED3031为蓝光LED激发光源在对应的透镜中掺杂红色量子点材料形成，绿色LED3033为蓝光LED激发光源在对应的透镜中掺杂绿色量子点材料形成，蓝色LED3032为蓝光LED激发光源采用透明的透镜形成。其蓝光LED激发光源原理结构图如图6本公开量子点透镜光源原理结构示意图所示，由蓝光LED501、量子点透镜502和反射片503构成。LED激发光源蓝光LED501根据需要可选择高频LED光源，例如紫光LED光源等。量子点透镜502上的量子点材料根据所需颜色，选择所述颜色的量子点材料。目前市场上的量子点材料除了II-VI族、III-V族体系的无机量子点，例如，CdE(E＝S/Se/Te)量子点，磷化铟量子点，砷化铟量子点，砷化镓量子点，砷化镓量子点及其他体系的例如硫化锌量子点、硒化锌量子点等。还出现了钙钛矿材料，例如无机钙钛矿CsPbX3(x＝Cl/Br/I)和有机-无机杂化钙钛矿材料CH3NH3PbX3(x＝Cl/Br/I)，CH3NH3PbX3(x＝Cl/Br/I)等。
对彩色光源进行的分区，可根据实际需要选择分区数，例如以四颗三芯合一的芯片303LED灯为一个分区，则当此处出现红色信号时，其中四颗红色的芯片同时点亮输出红色信号。一般来说，分区越多，成本越高。
如果要做高对比度，则分区数量就为LED灯的数量。即，每颗灯有独立开关，每颗灯中的芯片也是独立开关，每颗芯片根据输入信号的不同进行开关。例如，当此处需要显示红色信号时，此位置处的红色芯片点亮。这样即形成了彩色Local Dimming效果。
实施例二：
图5是本公开一种液晶显示背光模组优选实施例二的结构原理示意图所示。背光模组采用的LED背光光源包括排布在背板402上的若干LED灯条401，各LED灯条401中的单颗LED为红色LED403、绿色LED405、蓝色LED404或白色LED406，所述红色LED403、绿色LED405、蓝色LED404、白色LED406依序排布在LED灯条401上，各分区均包含有红色LED、绿色LED、蓝色LED和白色LED，红色LED403、绿色LED405、蓝色LED404、白色LED406的位置也可根据实际需要进行调整。
设置背光分区时，当分区数等于1时，为Global Dimming的控制方式，此时，各红色LED、绿色LED或蓝色LED单独点亮，通过背光算法调整，可实现Global Dimming控制。当分区大于1时，则为Local Dimming的控制方式，分区数越多，对比度则越高；当每个分区中均应同时包含红色LED、绿色LED、蓝色LED和白色LED，每颗LED灯均独立开关控制，例如以红色LED、绿色LED、蓝色LED和白色LED为一个分区，则当某显示位置需要显示红色信号时，分区中的红色LED点亮输出红色信号，形成Local Dimming控制效果。本优选实施例二中增加的白色LED同样可以提高能效，即点亮红色LED输出红色信号的同时也点亮白色LED，实现超高亮度的红色信号。在本例中，红色LED可以和白色LED分开控制，同时点亮红色LED与白色LED时实现Global Dimming或者Local Dimming控制效果，或者单独控制红色LED或白色LED实现Global Dimming或者Local Dimming控制效果，均可以根据显示的实际需要来实现控制。同理，绿色LED或蓝色LED加上白色LED也可实现上述红色LED加白色LED的Global Dimming或Local Dimming控制效果。
如果对色域要求特别高，则所述背光模组的LED背光光源中的各LED灯条401中的单颗LED中的红色LED403、绿色LED405或蓝色LED404均可选择为蓝光LED激发光源。红色LED403为蓝光LED激发光源在对应的透镜中掺杂红色量子点材料形成，绿色LED405为蓝光LED激发光源在对应的透镜中掺杂绿色量子点材料形成，蓝色LED404为蓝光LED激发光源采用透明的透镜形成。其蓝光LED激发光源原理结构图如图6本公开量子点透镜光源原理结构示意图所示，原理结构及量子点材料的选择与优选实施例一所述完全相同，在此不再多述。
实施例三：
本实施例三是考虑成本的情况下可折衷的一种技术手段，基于优选实施例一的基础来实现，在优选实施例一的三芯合一芯片成本较高的情况下，也可以将该三芯合一芯片的LED改为二芯合一芯片的LED。LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为红色LED、绿色LED和白色LED组成的彩色光源，或者为绿色、蓝色和白色LED组成的彩色光源，或者为红色、蓝色LED和白色LED组成 的彩色光源，以使各分区能够独立控制实现单色的红色、绿色、蓝色或白色背光。即采用的红色LED、绿色LED组成二芯合一的芯片LED与白色LED组成的彩色光源、绿色LED、蓝色LED组成的二芯合一的芯片LED与白色LED组成的彩色光源或者红色LED、蓝色LED组成的二芯合一的芯片LED与白色LED组成的彩色光源进行背光控制调节，因为二芯合一中的红色LED、绿色LED或绿色LED、蓝色LED或红色LED、蓝色LED，以及白色LED均有单独的电路进行控制，将二芯合一的芯片LED与白色LED配合可实现背光的控制。其工作原理与优选实施例一相同，此处不赘述。
另外，本优选实施例三如果对色域要求特别高的情况下，也可以如优选实施例一中对红色LED、绿色LED和蓝色LED采用蓝光LED激发光源配合相应透镜来实现，其工作原理也与上述优选实施例一中完全相同，此处不赘述。
应当理解的是，以上所述仅为本公开的较佳实施例而已，并不足以限制本公开的技术方案，对本领域普通技术人员来说，在本公开的精神和原则之内，可以根据上述说明加以增减、替换、变换或改进，而所有这些增减、替换、变换或改进后的技术方案，都应属于本公开所附权利要求的保护范围。

Claims (14)

  1. 一种液晶显示背光模组，所述背光模组为直下式背光模组，其特征在于，所述背光模组的LED背光光源为红色LED、绿色LED、蓝色LED和白色LED组成的彩色光源，并对彩色光源进行分区，以对各分区进行独立控制实现背光区域控制功能。
  2. 根据权利要求1所述的液晶显示背光模组，其特征在于，所述LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为间隔设置的包含红色LED、绿色LED和蓝色LED芯片的三芯合一的芯片和白色LED。
  3. 根据权利要求2所述的液晶显示背光模组，其特征在于，所述单颗LED中三芯合一芯片中的红色LED、绿色LED和蓝色LED芯片都电连接有单独的电路进行控制，白色LED也电连接单独的电路进行控制，以根据液晶显示画面所需的亮度和颜色调整电路的电流。
  4. 根据权利要求2所述的液晶显示背光模组，其特征在于，所述三芯合一的芯片为红色LED、绿色LED和蓝色LED三个芯片呈三角形设置在LED基板上。
  5. 根据权利要求1所述的液晶显示背光模组，其特征在于，所述LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为红色LED、绿色LED、蓝色LED或白色LED，所述红色LED、绿色LED、蓝色LED或白色LED依序排布在LED灯条上，各分区均包含有红色LED、绿色LED、蓝色LED或白色LED，以使各分区能够独立控制实现单色的红色、绿色、蓝色或白色背光。
  6. 根据权利要求1所述的液晶显示背光模组，其特征在于，所述LED背光光源包括排布在背板上的若干LED灯条，各LED灯条中的单颗LED为红色LED、绿色LED和白色LED组成的彩色光源，或者为绿色、蓝色和白色LED组成的彩色光源，或者为红色、蓝色LED和白色LED组成的彩色光源，以使各分区能够独立控制实现单色的红色、绿色、蓝色或白色背光。
  7. 根据权利要求6所述的液晶显示背光模组，其特征在于，所述LED灯条上的各LED均由单独的电路进行控制。
  8. 根据权利要求1所述的液晶显示背光模组，其特征在于，所述红色LED、绿色LED和蓝色LED均采用蓝光LED激发光源，红色LED为蓝光LED激发光源在对应的 透镜中掺杂红色量子点材料形成，绿色LED为蓝光LED激发光源在对应的透镜中掺杂绿色量子点材料形成，蓝色LED为蓝光LED激发光源采用透明的透镜形成。
  9. 根据权利要求8所述的液晶显示背光模组，其特征在于，所述量子点材料至少包括以下材料中的一种：磷化铟量子点、砷化铟量子点、砷化镓量子点、硫化锌量子点、硒化锌量子点、钙钛矿量子点材料。
  10. 根据权利要求8所述的液晶显示背光模组，其特征在于，所述蓝光LED激发光源可替换为紫光LED激发光源。
  11. 根据权利要求8所述的液晶显示背光模组，其特征在于，所述蓝光LED激发光源由蓝光LED、量子点透镜以及反射片构成。
  12. 根据权利要求8所述的液晶显示背光模组，其特征在于，对彩色光源进行分区时，分区数为1时，为全局控光，分区数大于1时为局部动态背光。
  13. 根据权利要求12所述的液晶显示背光模组，其特征在于，当分区数等于1时，所有红色LED相连接、所有绿色LED相连接，以及所有蓝色LED相连接，并通过背光算法控制点亮。
  14. 根据权利要求12所述的液晶显示背光模组，其特征在于，当分区数大于1时，每个分区中均应同时包含红色LED、绿色LED、蓝色LED和白色LED，并且每个分区中颜色相同的多个LED相互连接。
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