CN110687716A - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN110687716A CN110687716A CN201810722213.3A CN201810722213A CN110687716A CN 110687716 A CN110687716 A CN 110687716A CN 201810722213 A CN201810722213 A CN 201810722213A CN 110687716 A CN110687716 A CN 110687716A
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- light
- blue light
- blue
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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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S8/00—Lighting devices intended for fixed installation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a backlight source module, comprising: the cavity is arranged on the LED lamp strip in the cavity; a diffuser plate disposed over the cavity; and an optical film disposed on the diffusion plate; the backlight module also comprises a short-wave blue light absorbent for absorbing short-wave blue light; the short wave blue light absorbent is packaged in the LED light bar or coated on the optical film. According to the invention, the short-wave blue light absorbent is packaged in the LED lamp strip or coated on the optical film, and is used for absorbing short-wave blue light so as to reduce the proportion of the short-wave blue light, thereby reducing the harm of the short-wave blue light to human eyes.
Description
Technical Field
The invention relates to the technical field of televisions, in particular to a backlight source module.
Background
At present, the mass-produced liquid crystal televisions basically all adopt the LEDs as backlight sources, and the blue light chips of the LEDs are used for exciting red and green fluorescent powder or quantum dot materials, so that white backlight sources are obtained. With the continuous attention and deep research of medical science on the short-wave blue light, the short-wave blue light can cause eye fatigue, inhibit melatonin secretion to influence sleep, and even cause damage to retina cells of human eyes.
Although the blue light can be reduced by adopting a software mode of a blue light prevention mode or an eye protection mode on the mobile phone and the TV at present, the total energy of the blue light can be reduced, and the short-wave blue light with the wavelength of 420-460nm can not be filtered.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a backlight module, aiming at solving the problem that short-wave blue light cannot be filtered in the prior art, so as to damage eyes of a user.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a backlight module, comprising: the cavity is arranged on the LED lamp strip in the cavity; a diffuser plate disposed over the cavity; and an optical film disposed on the diffusion plate; wherein the content of the first and second substances,
the backlight module also comprises a short-wave blue light absorbent for absorbing short-wave blue light; the short wave blue light absorbent is packaged in the LED light bar or coated on the optical film.
The backlight source module is characterized in that the LED lamp strip comprises an LED light-emitting chip; the optical conversion layer is coated on the LED light-emitting chip and used for converting light emitted by the LED light-emitting chip into white light; and a short wavelength blue light absorbing layer disposed on the optical conversion layer;
when the short wave blue light absorbent is packaged in the LED lamp strip, the short wave blue light absorbent is arranged in the short wave blue light absorption layer.
The backlight module is characterized in that when the LED light emitting chip is a blue light chip, the optical conversion layer comprises yellow fluorescent powder, or a combination of green light and red light quantum dots.
The backlight module is characterized in that when the LED light-emitting chip is a combination of a blue chip and a green chip, the optical conversion layer comprises red fluorescent powder or red quantum dots.
The backlight module is characterized in that when the LED light-emitting chip is a combination of a blue light chip, a green light chip and a red light chip, the optical conversion layer is not required to be arranged.
The backlight module, wherein, still be provided with light stabilizer in the shortwave blue light absorption layer.
The backlight module, wherein, when shortwave blue light absorbent scribbles on the optical film piece, shortwave blue light absorbent scribbles on the upper portion or the lower part of optical film piece.
The backlight module comprises a backlight module, wherein the optical film comprises one or more of a diffusion sheet, a brightness enhancement sheet, a DBEF (direct light-emitting) film and a composite film.
The backlight module, wherein the short-wave blue light absorber comprises one or more of an organic blue light absorber and an organic-inorganic hybrid blue light absorber; the organic blue-light absorber comprises a phenolic organic blue-light absorber, an amine organic blue-light absorber or a triazole organic blue-light absorber; the organic-inorganic hybrid blue-light absorber is a nickel organic-inorganic hybrid blue-light absorber.
The backlight module is a direct type backlight module or a side type backlight module.
The invention has the beneficial effects that: according to the invention, the short-wave blue light absorbent is packaged in the LED lamp strip or coated on the optical film, and is used for absorbing short-wave blue light so as to reduce the proportion of the short-wave blue light, thereby reducing the harm of the short-wave blue light to human eyes.
Drawings
Fig. 1 is a schematic structural view of an LED light bar packaged with a short-wave blue light absorber in a backlight module according to the present invention.
Fig. 2 is a schematic structural view of an embodiment of the short-wave blue light absorber packaged in an LED light bar according to the present invention.
FIG. 3 is a schematic structural diagram of an embodiment of the present invention in which a short-wave blue light absorber is coated on an optical film.
Fig. 4 is a schematic diagram of a spectrum of blue light in different backlight modules.
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.
In the national standard document of light biological safety of GB _ T20145-2006 lamp and lamp system, a spectrum weighting function table of the damage of different wave band light sources to retina is given, and it can be seen from the standard document that the weighting factor of the damage of 420-460nm wave band to human eyes is the largest. At present, the central wavelength of a blue light chip commonly adopted by the backlight LED lamp bead is about 445-doped 460nm, and due to the half-wave width of the LED blue light wave band, the LED blue light wave band has quite part of blue light in 420-doped 460nm wave band, so that the injury to human eyes is great. Although the blue light can be reduced by adopting a software mode of a blue light prevention mode or an eye protection mode on the mobile phone and the TV at present, the total energy of the blue light can be reduced, and the 420-460nm short-wave blue light cannot be filtered. In order to solve the above problem, the present invention provides a backlight module, as shown in fig. 2, the backlight module includes: the LED lamp comprises a back plate (a reflecting sheet is arranged in the back plate), a cavity 22 and an LED lamp strip 21 arranged in the cavity 22 are arranged in the back plate; a diffusion plate 23 disposed above the cavity 22; and an optical film 24 provided on the diffusion plate 23; wherein, the backlight module further comprises a short-wave blue light absorber 15 (shown in fig. 1) for absorbing short-wave blue light; the short-wave blue light absorber 15 is packaged in the LED light bar 21 or coated on the optical film 24 (the optical film 24 is provided with multiple layers).
According to the invention, the short-wave blue light absorbent 15 is arranged to absorb the short-wave blue light, the short-wave blue light absorbent 15 can be arranged in the LED lamp strip 21 or on the optical diaphragm 24, and the proportion of the short-wave blue light is reduced by the arranged short-wave blue light absorbent 15, so that the harm to human eyes is reduced.
Specifically, as shown in fig. 1, the LED light bar 21 includes LED light emitting chips 11; an optical conversion layer 12 coated on the LED light emitting chip 11 for converting light emitted from the LED light emitting chip 11 into white light; and a short-wave blue light absorption layer 13 disposed on the optical conversion layer 12. When the short wave blue light absorbent is packaged in the LED lamp strip, the short wave blue light absorbent 15 is arranged in the short wave blue light absorption layer 13.
Further, the LED light emitting chip 11 in the present invention may be a blue chip, two chips of a blue chip and a green chip, or three chips of a blue chip, a green chip and a red chip. The central wavelengths of the blue light chip, the green light chip and the red light chip are respectively 440-470nm, 520-550nm and 620-650 nm. When the LED light emitting chip 11 is a blue light chip, the optical conversion layer 12 includes particles 14 therein, and the particles 14 are yellow phosphor, or a combination of green light and red light quantum dots. When the LED light emitting chip 11 is a combination of a blue light chip and a green light chip, the particles 14 in the optical conversion layer 12 are red fluorescent powder or red light quantum dots. When the LED light emitting chip 11 is a combination of a blue light chip, a green light chip and a red light chip, the optical conversion layer 12 does not need to be disposed, because the blue, green and red chips can be combined into a white light without a conversion layer.
Preferably, in this embodiment, the yellow phosphor is preferably YAG powder, the green and red phosphors are silicate or fluoride or nitride phosphors, the green phosphor is preferably β -sialon green, the red phosphor is preferably KSF phosphor, and the quantum dot is preferably a cadmium selenide quantum dot material, and of course, the optical conversion layer 12 further includes a encapsulant commonly used for LEDs. A light stabilizer 16 is further provided in the short-wavelength blue light absorption layer 13. Preferably, the blue-light absorber 15 includes one or more of organic blue-light absorbers and organic-inorganic hybrid blue-light absorbers, and the organic blue-light absorbers include phenolic organic blue-light absorbers, amine organic blue-light absorbers or triazole organic blue-light absorbers; the organic-inorganic hybrid blue-light absorber is a nickel organic-inorganic hybrid blue-light absorber.
Further, when the short wavelength blue light absorber is coated on the optical film, the short wavelength blue light absorber is coated on an upper portion or a lower portion of the optical film, and particularly, the present invention provides an embodiment to which the optical film coated with the short wavelength blue light absorber is applied, as shown in fig. 3. Fig. 3 shows an application example of the direct type backlight module, and the film with the short wave blue light absorber can also be applied to a side type backlight module. The backlight module in fig. 3 also includes a back plate (a reflective sheet is disposed in the back plate), a cavity 32 is disposed in the back plate, and an LED light bar 31 is disposed in the cavity 32; a diffusion plate 33 disposed above the cavity 32; and optical films 34 and 35 (optical films provided with a plurality of layers, indicated by 34 and 35 in fig. 3) provided on the diffusion plate 33. In this embodiment, the optical film 34 or the optical film 35 is coated with a short-wave blue light absorber (labeled in fig. 3), so that the optical film 34 or 35 has a function of absorbing short-wave blue light, thereby reducing the damage of the short-wave blue light to human eyes.
Preferably, the optical film 34 or 35 comprises one or more combinations of a diffuser, a brightness enhancement film, a DBEF, and a composite film. When the scheme of the backlight module adopts the scheme of the quantum dot film, in order to ensure the excitation efficiency of blue light to red and green quantum dots, the optical film containing the short-wave blue light absorber particles is arranged on the uppermost layer, i.e. the optical film 35 in fig. 3; if the backlight scheme is other than quantum dot film, the optical film containing the short wavelength blue absorber particles is preferably placed on the bottom layer, i.e., the optical film 34 in fig. 3.
Further, the present invention also provides blue light spectra in different backlight schemes, as shown in fig. 4, there are three blue light spectra in fig. 4 for different backlight schemes, and the three schemes are: the light source module adopts a common YAG-LED backlight source module, the backlight source module with the short-wave blue light absorbent and the backlight source module adopting software to reduce the total amount of blue light. In this embodiment, the ratio of shortwave blue light to total blue light is evaluated by using v = (420-.
| TV scheme | v |
| Common YAG-LED backlight scheme | 0.72 |
| Application of short wave blue light absorber particles to backlight scheme | 0.65 |
| Software blue light reduction scheme | 0.70 |
TABLE 1
As can be seen from table 1 and fig. 4, in the backlight module using software to reduce the total amount of blue light, the proportion of short-wave blue light to the total blue light is not greatly reduced, and the backlight module having the short-wave blue light absorber of the present invention can greatly reduce the proportion of short-wave blue light to protect the health of human eyes.
In summary, the present invention provides a backlight module, including: the cavity is arranged on the LED lamp strip in the cavity; a diffuser plate disposed over the cavity; and an optical film disposed on the diffusion plate; the backlight module also comprises a short-wave blue light absorbent for absorbing short-wave blue light; the short wave blue light absorbent is packaged in the LED light bar or coated on the optical film. According to the invention, the short-wave blue light absorbent is packaged in the LED lamp strip or coated on the optical film, and is used for absorbing short-wave blue light so as to reduce the proportion of the short-wave blue light, thereby reducing the harm of the short-wave blue light to human eyes.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A backlight module, comprising: a back plate provided with a cavity; the LED light bar is arranged in the cavity; a diffuser plate disposed over the cavity; and an optical film disposed on the diffusion plate; it is characterized in that the preparation method is characterized in that,
the backlight module also comprises a short-wave blue light absorbent for absorbing short-wave blue light; the short wave blue light absorbent is packaged in the LED light bar or coated on the optical film.
2. The backlight module of claim 1, wherein the LED light bar comprises LED light emitting chips; the optical conversion layer is coated on the LED light-emitting chip and used for converting light emitted by the LED light-emitting chip into white light; and a short wavelength blue light absorbing layer disposed on the optical conversion layer;
when the short wave blue light absorbent is packaged in the LED lamp strip, the short wave blue light absorbent is arranged in the short wave blue light absorption layer.
3. The backlight module of claim 2, wherein when the LED light emitting chip is a blue light emitting chip, the optical conversion layer comprises a yellow phosphor, or a combination of green light and red light quantum dots.
4. The backlight module of claim 2, wherein when the LED light emitting chip is a combination of a blue chip and a green chip, the optical conversion layer comprises red phosphor or red quantum dots.
5. The backlight module of claim 2, wherein when the LED light emitting chips are a combination of blue, green and red light emitting chips, the optical conversion layer is not required.
6. The backlight module of claim 2, wherein a light stabilizer is further disposed in the short wave blue absorption layer.
7. The backlight module of claim 1, wherein the short wavelength blue light absorber is coated on an upper portion or a lower portion of the optical film when the short wavelength blue light absorber is coated on the optical film.
8. The backlight module of claim 7, wherein the optical film comprises one or more of a diffuser, a brightness enhancement film, a DBEF film, and a composite film.
9. The backlight module of claim 1, wherein the short wavelength blue light absorber comprises one or more of an organic blue light absorber and an organic-inorganic hybrid blue light absorber; the organic blue-light absorber comprises a phenolic organic blue-light absorber, an amine organic blue-light absorber or a triazole organic blue-light absorber; the organic-inorganic hybrid blue-light absorber is a nickel organic-inorganic hybrid blue-light absorber.
10. The backlight module of claim 1, wherein the backlight module is a direct-type backlight module or a side-type backlight module.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810722213.3A CN110687716A (en) | 2018-07-04 | 2018-07-04 | Backlight module |
| PCT/CN2019/087888 WO2020007133A1 (en) | 2018-07-04 | 2019-05-22 | Backlight source module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810722213.3A CN110687716A (en) | 2018-07-04 | 2018-07-04 | Backlight module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110687716A true CN110687716A (en) | 2020-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810722213.3A Pending CN110687716A (en) | 2018-07-04 | 2018-07-04 | Backlight module |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110687716A (en) |
| WO (1) | WO2020007133A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111550690A (en) * | 2020-05-21 | 2020-08-18 | 济南明德光电科技有限公司 | Manufacturing method of LED strip lamp with anti-dazzle blue light filtering function |
| WO2022017177A1 (en) * | 2020-07-24 | 2022-01-27 | 深圳Tcl新技术有限公司 | Led light source and backlight module |
| CN114141140A (en) * | 2021-11-01 | 2022-03-04 | 深圳市高展光电有限公司 | Blue light prevention display screen assembly |
| WO2023071459A1 (en) * | 2021-10-27 | 2023-05-04 | 惠州视维新技术有限公司 | Backlight module and display screen |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI738566B (en) * | 2020-11-17 | 2021-09-01 | 優美特創新材料股份有限公司 | Backlight unit with phosphors and quantum dots |
| CN114578613A (en) * | 2020-11-30 | 2022-06-03 | 优美特创新材料股份有限公司 | Backlight module containing fluorescent powder and quantum dots |
| US11209697B1 (en) | 2020-11-30 | 2021-12-28 | Unique Materials Co., Ltd. | Backlight unit with phosphors and quantum dots |
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| CN114141140A (en) * | 2021-11-01 | 2022-03-04 | 深圳市高展光电有限公司 | Blue light prevention display screen assembly |
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| Publication number | Publication date |
|---|---|
| WO2020007133A1 (en) | 2020-01-09 |
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Application publication date: 20200114 |