CN110837191A - Liquid crystal display backlight module - Google Patents
Liquid crystal display backlight module Download PDFInfo
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- CN110837191A CN110837191A CN201810934641.2A CN201810934641A CN110837191A CN 110837191 A CN110837191 A CN 110837191A CN 201810934641 A CN201810934641 A CN 201810934641A CN 110837191 A CN110837191 A CN 110837191A
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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
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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
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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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
The invention discloses a liquid crystal display backlight module, which is a lateral-in type backlight module, wherein an LED backlight source of the backlight module is a color light source consisting of a red LED, a green LED and a blue LED, the red LED, the green LED and the blue LED can also adopt quantum dot material LEDs or adopt a high-frequency LED light source to excite red, green and blue quantum dot lenses, wherein a single LED in the color light source can adopt a chip integrating three cores or independently adopt red, green or blue LED lamps, the LED chips of all colors are electrically connected with independent control circuits, and the backlight area control function is realized by independently controlling all subareas through the subareas of the color light source. The invention can realize regional lighting of the backlight LED light source, and can greatly reduce energy consumption compared with the traditional LED white light full white field high-brightness scheme. In the case of particularly high color gamut requirements, the quantum dot LED light source is used to form the backlight source, or the high-frequency LED light source is used to excite the red, green and blue quantum dot lenses, so that high color gamut display can be realized.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to a liquid crystal display backlight module.
Background
Currently, in the field of liquid crystal display technology, hdr (high Dynamic range) high Dynamic range technology is increasingly used, and high brightness and high color gamut technology is a hot spot for research in the display industry. The high brightness enables the picture displayed by the display device to have a brightness detail level, and for the picture with high brightness, such as the reflection of glass in the sun, fireworks in the night sky and the like, the whole display picture is generally not high in brightness, but is ultrahigh brightness in a short time and a small area. In order to achieve this effect, the backlight design generally considers partitioning the whole light source scheme, i.e. 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 color quantity, high color saturation, more vivid color than the television with the common color gamut, and beautiful image quality. If a highlighted picture appears on a display device with a low color gamut, the phenomena of whitish picture color, color distortion and unclear detail color can occur.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention provides the liquid crystal display backlight module capable of realizing high-brightness and high-color-gamut display effects to solve the defects of the prior art, and the liquid crystal display backlight module can be combined with a Local Dimming technology to solve the problems of color distortion and low color reproduction degree under a high-brightness picture.
The technical scheme adopted by the invention for solving the technical problem is as follows:
the backlight module is a side-in type backlight module, an LED backlight source of the backlight module is a color light source consisting of a red LED, a green LED and a blue LED, and the color light source is partitioned to independently control each partition to realize the backlight area control function.
As an improved technical scheme, a red LED, a green LED and a blue LED in an LED backlight source of the backlight module are all blue LED excitation light sources, the red LED is formed by doping a red quantum dot material in a corresponding lens with the blue LED excitation light source, the green LED is formed by doping a green quantum dot material in a corresponding lens with the blue LED excitation light source, and the blue LED is formed by adopting a transparent lens with the blue LED excitation light source.
As an improved technical scheme, the quantum dot material is an indium phosphide quantum dot, an indium arsenide quantum dot, a gallium arsenide quantum dot, a zinc sulfide quantum dot, a zinc selenide quantum dot or a perovskite quantum dot material.
As an improved technical solution, the blue LED excitation light source may adopt a violet LED excitation light source.
As an improved technical scheme, the LED backlight light source includes a plurality of LED light bars arranged on a back plate, a single LED in each LED light bar is a three-in-one chip including a red LED, a green LED, and a blue LED chip, and the red LED, the green LED, and the blue LED chip in the single LED are all electrically connected to an individual circuit for control so as to adjust the current of the circuit according to the brightness and color required by the liquid crystal display picture.
As an improved technical scheme, white LEDs are arranged among single LEDs formed by the three-in-one chip according to the size interval of the subareas.
As an improved technical scheme, the LED backlight light source includes a plurality of LED light bars arranged on a back plate, a single LED in each LED light bar is a red LED, a green LED or a blue LED, the red LED, the green LED and the blue LED are arranged on the LED light bars in sequence, and each partition includes the red LED, the green LED and the blue LED, so that each partition can be independently controlled to realize monochromatic red, green or blue backlight.
As an improved technical scheme, white LEDs are arranged among the single LEDs according to the size interval of the subareas.
Compared with the prior art that LED white light is used as a backlight source, the liquid crystal display backlight module disclosed by the invention adopts RGB (red, green and blue) colored light sources as the backlight source in the backlight source and combines a local dynamic backlight technology to realize a dynamic color gamut technology combining high brightness and high color gamut. The colored backlight source is partitioned, the content of the partitioned area is independently controlled, the colored LocalDimming effect is achieved, the backlight LED light source can be lightened regionally when high-brightness and high-color saturation is needed, and compared with the scheme of the traditional LED white light full-white-field high-brightness, the energy consumption can be greatly reduced. In the case of a particularly high color gamut requirement, the backlight source can be formed by a quantum dot red LED, a quantum dot green LED, and a quantum dot blue LED light source, or the high-frequency LED light source, such as a violet LED light source, can be used to excite a red, green, and blue quantum dot lens to realize high color gamut display.
Drawings
FIG. 1 is a schematic cross-sectional view of a liquid crystal display backlight module according to the present invention.
Fig. 2 is a schematic diagram of a back plate LED light bar arrangement structure of a liquid crystal display backlight module according to the present invention.
FIG. 3 is a schematic diagram of a first preferred embodiment of a liquid crystal display backlight module according to the present invention.
Fig. 4 is an enlarged schematic structural diagram of a single LED chip in fig. 3.
Fig. 5 is a schematic structural diagram of a second preferred embodiment of a liquid crystal display backlight module according to the invention.
FIG. 6 is a schematic diagram of a quantum dot lens light source according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The backlight module is one of the key components of the liquid crystal display panel. The function is to provide sufficient brightness and light source with uniform distribution, so that the image can be displayed normally. The so-called BackLight (BackLight) is a light source located in the lcd, and its light-emitting effect will directly affect the visual effect of the lcd module. Besides the direct effect on the display quality of LCD, the cost of backlight source is 30-50% of the LCD module, and the power consumption is more 75% of the LCD module, which is a very important component of the LCD module. At present, there are three types of backlight sources, i.e., EL, CCFL and LED, which are classified into edge type and direct type (bottom backlight type) according to the distribution position of the light source. The side light type is a single light source with its light source (Edge lighting) arranged on the side; compared with the direct type light source design with side incidence, the light source has the characteristics of light weight, thinness, narrow frame and low power consumption. Mainly comprises a light source, a light guide plate, an optical film, a plastic frame and the like. With the advent of HDR technology, high brightness and high color gamut technology has become a hotspot for research in the display industry. The combination of high brightness and high gamut can display more perfect colors. The high color gamut display technology has the characteristics of wide color quantity, high color saturation, more vivid color than a television with a common color gamut and bright image quality. If a highlighted picture appears on a display device with a low color gamut, the picture can have the phenomena of whitish color, color distortion and unclear specific detail color. The problem of low color gamut does not have a solution at present.
The liquid crystal display backlight module is a side-in type backlight module. As shown in fig. 1, which is a schematic diagram of a cross-sectional structure of a liquid crystal display backlight module according to the present invention, the side-in type backlight module mainly comprises an LED light bar (101), a reflective sheet (102), a light guide plate (103), a back plate (104), an optical film set (105), and a heat dissipation plate (106). The light source used in the traditional lateral backlight scheme is an LED white light source, namely, the LED lamps distributed on the LED lamp strip (101) are white LED light sources. Fig. 2 is a schematic diagram of a back panel LED light bar arrangement structure principle of the liquid crystal display backlight module according to the present invention, wherein the LED light bars (101) are uniformly arranged with LED lamps (201), and the light guide plate (103) is in front of the LED light bars. In order to realize high-brightness and high-color-gamut high-image-quality effects, the LED lamp (201) adopted by the liquid crystal display backlight module is a color light source consisting of a red LED, a green LED and a blue LED, and the color light source is partitioned to independently control each partition to realize the backlight area control function, so that the display equipment can give consideration to color details when displaying a high-brightness picture, namely in a high-brightness scene, the color reproduction degree cannot be reduced, the phenomenon of high-brightness distorted pictures cannot occur, and due to the color LocalDimming technology, the picture contrast can be greatly improved, and the energy-saving effect is realized.
As shown in fig. 3, which is a schematic structural diagram of a first preferred embodiment of the liquid crystal display backlight module according to the present invention, an LED lamp adopted by the liquid crystal display backlight module according to the first preferred embodiment of the present invention is a three-in-one chip including a red LED, a green LED, and a blue LED chip, the LED lamps (302) are uniformly arranged on the LED light bar (301), and a principle of the LED lamp (302) including a three-in-one chip including a red LED (3021), a green LED (3023), and a blue LED (3022) is as shown in fig. 4, which is an enlarged schematic structural diagram of a single LED chip in fig. 3, and the three chips of the red LED (3021), the green LED (3023), and the blue LED (3022) are linearly arranged on the LED substrate (401) to form the LED lamp (302). However, the three chips of the red LED (3021), the green LED (3023) and the blue LED (3022) are not only arranged on the LED substrate (401) in a straight line to form the LED lamp (302), but also the three chips of the red LED (3021), the green LED (3023) and the blue LED (3022) may be arranged on the LED substrate (401) in a triangular shape or the like to form the LED lamp (302). Each red LED (3021), green LED (3023) and blue LED (3022) in the LED lamp (302) is controlled by a separate circuit, parameters such as current of the separate circuits are adjusted according to the required brightness and color, and when the mixture ratio is adjusted to be proper, the three-in-one LED lamp can display pure white.
If the requirement on the color gamut is particularly high, the red LED (3021), the green LED (3023), and the blue LED (3022) of the LED lamp (302) in the LED backlight source of the backlight module can be selected as blue LED excitation light sources: the red LED (3021) is formed by doping a red quantum dot material in a corresponding lens with a blue LED excitation light source, the green LED (3023) is formed by doping a green quantum dot material in a corresponding lens with a blue LED excitation light source, and the blue LED (3022) is formed by adopting a transparent lens with a blue LED excitation light source. The principle structure diagram of the blue light LED excitation light source is shown in fig. 6, which is a principle structure diagram of the quantum dot lens light source of the invention, and the quantum dot lens light source is composed of a blue light LED (601), a quantum dot lens (602) and a reflector plate (603). The LED excitation light source is a blue LED (601), and a high-frequency LED light source, such as a purple LED light source and the like, can be selected according to needs. The quantum dot material on the quantum dot lens (602) is selected according to the desired color. The quantum dot materials on the market at present are inorganic quantum dots of II-VI and III-V systems, such as CdSe (E = S/Se/Te) quantum dots, indium phosphide quantum dots, indium arsenide quantum dots, gallium arsenide quantum dots and other systems such as zinc sulfide quantum dots, zinc selenide quantum dots and the like. Perovskite materials such as inorganic perovskite CsPbX3 (x = Cl/Br/I) and organic-inorganic hybrid perovskite materials CH3NH3PbX3 (x = Cl/Br/I), CH3NH3PbX3 (x = Cl/Br/I), and the like, also appear.
If the requirement on the color gamut is not high, white LED lamps can be added among the LED lamps (302) according to actual needs, and the number and the positions of the white LED lamps are designed according to the actual needs. This not only increases the brightness, but also reduces the cost.
The number of the subareas of the color light source can be selected according to actual needs, for example, four LED lamps (302) are taken as one subarea, and when a red signal appears, four red chips are simultaneously lightened to output the red signal. Generally, the more partitions, the higher the cost.
If high contrast is to be made, the number of segments is the number of LED lamps. 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 the difference of input signals. For example, when a red signal needs to be displayed here, the red chip at this position lights up. Thus, a color Local Dimming effect is formed.
Fig. 5 is a schematic structural diagram of a second preferred embodiment of a liquid crystal display backlight module according to the invention. The LED lamps adopted by the liquid crystal display backlight module of the second preferred embodiment of the invention are a red LED (502), a green LED (504) and a blue LED (503). The red LEDs (502), the green LEDs (504) and the blue LEDs (503) are uniformly and orderly arranged on the LED light bar (501). The positions of the red LED (502), the green LED (504) and the blue LED (503) can be adjusted according to actual needs. The LED array can be arranged on the same straight line or in a scattered way, and the sequence of the red LED (502), the green LED (504) and the blue LED (503) can be adjusted according to the actual requirement. Fig. 5 is a schematic view of a structural principle of a second preferred embodiment of the liquid crystal display backlight module according to the present invention, which only shows a simple arrangement.
If the requirement on the color gamut is particularly high, a single LED in an LED light bar (501) in an LED backlight light source of the backlight module is as follows: the red LED (502), green LED (504), or blue LED (503) can all be selected as blue LED excitation light sources: the red LED (502) is formed by doping a red quantum dot material in a corresponding lens by a blue LED excitation light source, the green LED (504) is formed by doping a green quantum dot material in a corresponding lens by a blue LED excitation light source, and the blue LED (503) is formed by adopting a transparent lens by the blue LED excitation light source. The principle structure and the choice of quantum dot material are exactly the same as those described in the first preferred embodiment, and will not be described in detail here.
If the requirement on the color gamut is not high, white LEDs can be added among the red LEDs (502), the green LEDs (504) and the blue LEDs (503) according to the actual requirement, and the number and the positions of the white LEDs are designed according to the actual requirement. This not only increases the brightness, but also reduces the cost.
The number of the subareas of the color light source can be selected according to actual needs, but each subarea is ensured to contain a red LED (502), a green LED (504) and a blue LED (503). For example, six lamps are taken as a subarea, and two of the red LED (502), the green LED (504) and the blue LED (503) are generally included, and when a red signal appears, all the red LEDs are simultaneously lightened to output the red signal. Thus, a color Local Dimming effect is formed.
The above embodiments of the present invention can be applied to a curved backlight module.
It should be understood that the above-mentioned embodiments are merely preferred examples of the present invention, and not restrictive, but rather, all the changes, substitutions, alterations and modifications that come within the spirit and scope of the invention as described above may be made by those skilled in the art, and all the changes, substitutions, alterations and modifications that fall within the scope of the appended claims should be construed as being included in the present invention.
Claims (8)
1. The liquid crystal display backlight module is characterized in that the backlight module is a side-in type backlight module, an LED backlight light source of the backlight module is a color light source consisting of a red LED, a green LED and a blue LED, and the color light source is partitioned to independently control each partition to realize a backlight area control function.
2. The liquid crystal display backlight module according to claim 1, wherein the red LED, the green LED and the blue LED in the LED backlight source of the backlight module are blue LED excitation light sources, the red LED is formed by doping the blue LED excitation light sources with red quantum dot materials in the corresponding lenses, the green LED is formed by doping the blue LED excitation light sources with green quantum dot materials in the corresponding lenses, and the blue LED is formed by using transparent lenses as the blue LED excitation light sources.
3. The liquid crystal display backlight module of claim 2, wherein the quantum dot material is an indium phosphide quantum dot, an indium arsenide quantum dot, a gallium arsenide quantum dot, a zinc sulfide quantum dot, a zinc selenide quantum dot or a perovskite quantum dot material.
4. The liquid crystal display backlight module as claimed in claim 2, wherein the blue LED excitation light source is a violet LED excitation light source.
5. The LCD backlight module of any one of claims 1 to 4, wherein the LED backlight source comprises a plurality of LED light bars arranged on a back plate, a single LED in each LED light bar is a three-in-one chip comprising a red LED, a green LED and a blue LED, and the red LED, the green LED and the blue LED in the single LED are electrically connected with a separate circuit for control so as to adjust the current of the circuit according to the brightness and color required by the LCD picture.
6. The liquid crystal display backlight module according to claim 5, wherein white LEDs are arranged among the single LEDs formed by the three-in-one chip according to the size of the partition.
7. The liquid crystal display backlight module of any one of claims 1 to 4, wherein the LED backlight source comprises a plurality of LED light bars arranged on a back plate, a single LED in each LED light bar is a red LED, a green LED or a blue LED, the red LED, the green LED and the blue LED are sequentially arranged on the LED light bars, and each partition comprises the red LED, the green LED and the blue LED, so that each partition can be independently controlled to realize monochromatic red, green or blue backlight.
8. The liquid crystal display backlight module according to claim 7, wherein white LEDs are arranged among the single LEDs according to the size of the subareas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810934641.2A CN110837191A (en) | 2018-08-16 | 2018-08-16 | Liquid crystal display backlight module |
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| CN201810934641.2A CN110837191A (en) | 2018-08-16 | 2018-08-16 | Liquid crystal display backlight module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112289781A (en) * | 2020-11-04 | 2021-01-29 | 深圳市大象视界科技有限公司 | LED display screen 3D image implementation method and quantum dot LED display screen thereof |
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| WO2018037775A1 (en) * | 2016-08-24 | 2018-03-01 | シャープ株式会社 | Light source device and backlight device provided with same, and display device |
| CN108051948A (en) * | 2017-10-11 | 2018-05-18 | 深圳Tcl新技术有限公司 | Backlight module and display device |
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| CN203519974U (en) * | 2013-10-11 | 2014-04-02 | 深圳Tcl新技术有限公司 | Light-emitting assembly of backlight module and liquid crystal display device |
| CN103796380A (en) * | 2013-12-25 | 2014-05-14 | 深圳市华星光电技术有限公司 | Liquid crystal display device, and backlight source and light modulation method thereof |
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| CN112289781A (en) * | 2020-11-04 | 2021-01-29 | 深圳市大象视界科技有限公司 | LED display screen 3D image implementation method and quantum dot LED display screen thereof |
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