CN210897333U - Blue light prevention packaged LED light-emitting device and backlight module thereof - Google Patents
Blue light prevention packaged LED light-emitting device and backlight module thereof Download PDFInfo
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- CN210897333U CN210897333U CN201721908217.8U CN201721908217U CN210897333U CN 210897333 U CN210897333 U CN 210897333U CN 201721908217 U CN201721908217 U CN 201721908217U CN 210897333 U CN210897333 U CN 210897333U
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Abstract
The utility model discloses a prevent blue light encapsulation LED luminescent device and backlight unit thereof, including at least one LED blue light chip, LED blue light chip has covered the fluorescence conversion layer on, the fluorescence conversion layer includes white light conversion phosphor powder and thermosetting colloid, the fluorescence conversion layer still includes the fluorescence conversion material that can absorb the blue light that the peak wavelength is in 435 and 475nm wave band within range makes the peak wavelength red shift of blue light; the backlight module is internally provided with the blue light prevention packaged LED luminescent device. The utility model aims at providing a prevent blue light encapsulation LED luminescent device and backlight unit thereof makes LED luminescent device and has this LED luminescent device's backlight unit both can reduce the harm of blue light, can keep original encapsulation color point and luminance again.
Description
Technical Field
The utility model relates to a LED technical field, a prevent blue light encapsulation LED luminescent device and backlight unit thereof specifically says so.
Background
Blue light prevention becomes a new hotspot in the field of LEDs, and the market demand for blue light prevention products is increasing. The traditional blue light exists in the light emitted by computer displays, fluorescent lamps, mobile phones, digital products, display screens, LEDs and the like in a large amount, and the blue light in the wavelength can increase the toxin amount of a macular area in eyes and seriously threaten the eye health of people. Harmful blue light between 400nm and 450nm has the largest energy and the largest harm to human eyes.
Currently, the blue light prevention technology of LEDs is mainly divided into two types: one method is a module structure, and a material for filtering specific wavelengths is added in the module structure to filter the specific blue light wavelength part, so that harmful blue light energy can be effectively reduced, but the reduction of the blue light energy can change the RGB ratio of the module, and the color point of the module is changed; the other method is that a blue light chip with long wavelength is used in LED packaging, the 435nm part with the greatest damage to human eyes is staggered, the short-wave blue light part is effectively reduced, but the LED packaging brightness is reduced by using a long-wave chip.
Therefore, it is an urgent technical problem in the art to develop an LED light emitting device that can reduce the harm of blue light, maintain the original color point and brightness of the package, and realize mass production based on the existing LED package technology.
SUMMERY OF THE UTILITY MODEL
For solving the not enough in the prior art, the utility model aims to provide a prevent blue light encapsulation LED luminescent device and backlight unit thereof makes LED luminescent device and has this LED luminescent device's backlight unit both can reduce the harm of blue light, can keep original encapsulation colour point and luminance again.
In order to solve the above problem, the utility model provides a prevent blue light encapsulation LED luminescent device, including at least one LED blue light chip, LED blue light chip has covered the fluorescence conversion layer, the fluorescence conversion layer includes white light conversion phosphor powder and thermosetting colloid, a serial communication port, the fluorescence conversion layer still includes the fluorescence conversion material that can absorb peak wavelength and make the peak wavelength red-shift of blue light at 435 and 475nm wave band within range.
Preferably, the weight percentage of the fluorescence conversion material in the fluorescence conversion layer is 2% -30%.
Preferably, the fluorescence conversion material has emission in the wavelength range of 465-500 nm.
Preferably, the fluorescence conversion material is selected from one or more of LuAG, LuGaAG, GaYAG, and gamma-ALON.
Preferably, the absorption peak of the fluorescence conversion material is in the wavelength range of 410-445nm, and the half-wave width of the absorption peak is less than 60 nm.
Preferably, the absorption capacity of the fluorescence conversion material for blue light at a wavelength of 455nm is lower than 20% of the maximum peak of the absorption of blue light by the fluorescence conversion material.
Preferably, the absorption capacity of the fluorescence conversion material for blue light in the wavelength range of more than 455nm is smaller than that in the wavelength range of less than 455 nm.
Preferably, the thermosetting colloid is selected from one or more of silica gel, silicone resin or epoxy resin.
The blue light packaging prevention LED backlight module comprises an LED light emitting device, wherein the LED light emitting device is based on the blue light packaging prevention LED light emitting device.
Adopt above-mentioned preferred scheme, compare with prior art, the utility model has the advantages of it is following:
1. adopt the utility model discloses a LED luminescent device, it adds the blue light that can absorb peak wavelength in 435-475nm wave band within range in the fluorescence conversion layer and makes the red fluorescence conversion material that moves of peak wavelength of blue light, because harmful shortwave blue light peak wavelength red-shift, has avoided the shortwave blue light of the great 435nm wavelength of harmful effect to human eye to play fine protection eyes's effect.
2. The fluorescent conversion material has strong absorption in the wave band range of 410-445nm, and has little absorption to the blue light part in the wave band range above 455nm wavelength, so that harmful short-wave blue light of the LED luminescent device after packaging is greatly reduced, and the fluorescent conversion material has emission enhancement in the wave band range of 465-500nm, so that blue light required by exciting the white light part of the original LED can be supplemented, RGB (red, green and blue) in the LED luminescent device is balanced, and the color point of the LED is kept unchanged before special fluorescent powder is added.
3. Adopt the utility model discloses a LED luminescent device, the blue light chip in the shorter wave band of use wavelength within range alright reach with the blue light chip in the longer wave band of use wavelength the same prevent blue light effect, avoided the problem that LED luminescent device luminous brightness reduces when the blue light chip in the longer wave band of use wavelength within range simultaneously, convenient to popularize and apply.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.
Fig. 1 is a schematic structural diagram of an LED light emitting device of the present invention;
FIG. 2 is a schematic diagram of a typical spectral comparison of the present invention;
FIG. 3 is a schematic diagram comparing the peak red shift of the present invention;
FIG. 4 is a schematic diagram of the excitation spectrum of the fluorescence conversion material of the present invention;
fig. 5 is a schematic structural view of a direct type LED backlight module according to embodiment 5 of the present invention;
fig. 6 is a schematic structural view of a side-in LED backlight module according to embodiment 6 of the present invention.
Wherein:
100-an LED light-emitting device, 101-a bracket, 102-an LED blue light chip, 103-a fluorescence conversion layer and 104-a cup;
200-direct type backlight module, 201-optical lens, 202-first PCB, 203-backboard, 204-diffusion plate, 205-prism sheet, 206-diffusion sheet;
300-side entrance type backlight module, 301-second PCB, 302-reflector, 303-light guide plate, 304-brightness enhancement film and 305-diffusion film.
Detailed Description
In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and the described embodiments are merely some embodiments, rather than all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The utility model provides a pair of prevent blue light encapsulation LED luminescent device, including at least one LED blue light chip, LED blue light chip has covered the fluorescence conversion layer on, the fluorescence conversion layer includes white light conversion phosphor powder and thermosetting colloid. Compared with the LED light emitting device in the prior art, the LED light emitting device of the present invention has the main improvement that the fluorescence conversion layer further includes a fluorescence conversion material capable of absorbing the blue light with the peak wavelength within the range of 435-475nm band to red-shift the peak wavelength of the blue light.
As a preferable scheme, the weight percentage of the fluorescence conversion material in the fluorescence conversion layer is 2% -30%. The fluorescence conversion material can be selected from one or more of LuAG, LuGaAG, GaYAG and gamma-ALON. And the fluorescence conversion material has emission in the wavelength range of 465-500nm, as shown in FIG. 4.
Furthermore, the absorption peak of the fluorescence conversion material is in the wavelength range of 410-445nm, and the half-wave width of the absorption peak is less than 60 nm. The absorption capacity of the fluorescence conversion material for blue light at the wavelength of 455nm is lower than 20% of the maximum peak value of the absorption of blue light by the fluorescence conversion material. The absorption capacity of the fluorescent conversion material for blue light in the wavelength range of more than 455nm is smaller than that in the wavelength range of less than 455 nm.
As a preferred scheme, the thermosetting colloid can be selected from one or more of silica gel, silicone resin or epoxy resin.
The technical solution of the present invention will be further explained in detail with reference to the following embodiments and accompanying drawings:
example 1
The embodiment provides a blue light prevention packaged LED light-emitting device, which consists of an LED blue light chip with the peak wavelength of 445nm and a fluorescence conversion layer. The fluorescence conversion layer is composed of white light conversion fluorescent powder, a fluorescence conversion material and silica gel.
In this embodiment, the white light conversion phosphor absorbs yellow light emitted by the LED blue light chip within the wavelength range of 500-600nm, and the blue light emitted by the LED blue light chip and the yellow light emitted by the white light conversion phosphor are mixed to form white light. In order to reduce the harm of high-energy short-wave blue light in the wavelength range of 400-450nm, avoid the pure content reduction of blue light to cause the color coordinate to shift out of the range of the backlight source requirement, thereby adding the fluorescence conversion material described in the present embodiment, the fluorescence conversion material in the present embodiment is LuAG, the absorption peak wavelength thereof is located at 430nm, the absorption of 455nm wavelength blue light is 20% of the maximum absorption peak, and the absorption capacity of blue light in the wavelength range larger than 455nm wavelength is lower than the wavelength range smaller than 455nm wavelength. The half-wave width of the absorption peak of the fluorescence conversion material in the embodiment is 60nm, the emission peak thereof is 510nm, and the emission is within the wavelength range of 465-500 nm. The weight percentage of the fluorescence conversion material in this example was 10%. By adding the fluorescent conversion material, the peak wavelength of the LED blue light chip is red-shifted by 3 nm. In this embodiment, the backlight source required color coordinates of (0.27 ± 0.08) can be realized.
Example 2
This embodiment provides a blue light-proof packaged LED light emitting device, and the same points as those in embodiment 1 are not described in detail.
The peak wavelength of the LED blue light chip in this embodiment is 455nm, the white light conversion phosphor absorbs the green light and the red light emitted by the LED blue light chip, and the blue light emitted by the LED blue light chip and the green light and the red light emitted by the white light conversion phosphor are mixed into white light. The fluorescence conversion material in this example was LuGaAG, whose absorption peak wavelength was 410nm, and the absorption of 455nm blue light was 15% of the maximum absorption peak. The half-wave width of the absorption peak of the fluorescence conversion material in this embodiment is 50nm, the emission peak thereof is 500nm, and the emission is within the wavelength range of 465-500 nm. The weight percentage of the fluorescence conversion material in this example was 20%. By adding the fluorescent conversion material, the peak wavelength of the LED blue light chip is red-shifted by 5 nm.
Example 3
This embodiment provides a blue light-proof packaged LED light emitting device, and the same points as those in embodiment 1 are not described in detail.
The peak wavelength of the LED blue light chip in this embodiment is 435nm, the white light conversion phosphor absorbs the green light and the red light emitted by the LED blue light chip, and the blue light emitted by the LED blue light chip and the green light and the red light emitted by the white light conversion phosphor are mixed into white light. The fluorescence conversion material in this example was GaYAG with an absorption peak wavelength of 430nm and an absorption of 455nm blue light of 5% of the maximum absorption peak. The half-wave width of the absorption peak of the fluorescence conversion material in the embodiment is 60nm, the emission peak thereof is 520nm, and the emission is within the wavelength range of 465-500 nm. The weight percentage of the fluorescence conversion material in this example was 2%. By adding the fluorescent conversion material, the peak wavelength of the LED blue light chip is red-shifted by 1 nm.
Practice ofExample 4
This embodiment provides a blue light-proof packaged LED light emitting device, and the same points as in embodiment 1 are not described in detail.
The peak wavelength of the LED blue light chip in this embodiment is 475nm, the white light conversion phosphor absorbs the green light and the red light emitted by the LED blue light chip, and the blue light emitted by the LED blue light chip and the green light and the red light emitted by the white light conversion phosphor are mixed into white light. The fluorescence conversion material in this example was γ -ALON, with an absorption peak wavelength of 430nm and an absorption of 455nm blue light of 15% of the maximum absorption peak. The half-wave width of the absorption peak of the fluorescence conversion material in the embodiment is 60nm, the emission peak thereof is 521nm, and the emission is within the wavelength range of 465-500 nm. The weight percentage of the fluorescence conversion material in this example was 30%. By adding the fluorescent conversion material, the peak wavelength of the LED blue light chip is red-shifted by 5 nm.
Blue light peak wavelength red shift referring schematically to fig. 3, it is apparent that the specific blue light peak wavelength red shift wavelength band length is relevant to the fluorescence conversion material of the present invention, as described in examples 1-4. The embodiment of the utility model provides a LED luminescent device who makes in 1-4, its schematic structure diagram all can refer to fig. 1, the LED luminescent device 100 shown in fig. 1, it has a LED support 101, and this support top is inwards sunken to form a cup bowl 104, and LED blue light chip 102 is established in cup bowl 104 bottom, and fluorescence conversion layer 103 fills in cup bowl 104 and covers the surface on LED blue light chip 102 goes out the plain noodles. Of course, in practical application, still there is the LED luminescent device who does not contain the LED support, and this moment technical staff in the art can be according to actual need and prepare the LED luminescent device who has the characteristics of the utility model discloses the LED luminescent device who does not contain the LED support is provided with as long as the surface cladding that goes out the plain noodles at its LED chip has the utility model discloses the fluorescence conversion layer of characteristics can.
The utility model provides a prevent blue light encapsulation LED luminescent device can be applied to LED backlight unit, for example straight following formula or the backlight unit of side income formula. The following is further illustrated by examples 5, 6:
example 5
The embodiment provides a blue light-proof packaged LED direct type backlight module 200, the structure of the backlight module 200 may be the existing structure of the LED direct type backlight module, and the main difference between the backlight module 200 and the existing LED direct type backlight module is that the LED light emitting device of the backlight module is the blue light-proof packaged LED light emitting device 100 provided in any one of embodiments 1 to 4. Fig. 5 shows an LED direct type backlight module 200 using the blue light prevention encapsulated LED light emitting device 100 of embodiment 1. The backlight module 200 shown in fig. 5 includes a first PCB 202, optical lenses 201, a diffuser 204, a prism sheet 205, a diffuser 206, and a back plate 203. The LED light emitting device 100 is disposed on the first PCB 202, the optical lens 201 is disposed on the top of the LED light emitting device 100, the first PCB 202 with the LED light emitting device 100 is fixedly disposed on the bottom of the back plate 203, the diffuser plate 204 is disposed on the top of the back plate 203, the prism sheet 205 is disposed on the upper surface of the diffuser plate 204, and the diffuser sheet 206 is disposed on the upper surface of the prism sheet 205.
Example 6
The present embodiment provides a blue light-proof packaged LED edge-in type backlight module 300, the structure of the backlight module 300 may be the existing LED edge-in type backlight module structure, and the main difference between the backlight module 300 and the existing LED edge-in type backlight module is that the LED light emitting device of the backlight module is the blue light-proof packaged LED light emitting device 100 provided in any one of embodiments 1 to 4. Fig. 6 shows an LED side-in backlight module 300 employing the blue light prevention encapsulated LED light emitting device 100 of embodiment 1. The backlight module 300 shown in fig. 6 includes a light guide plate 303, a reflector 302, a brightness enhancement film 304, and a diffusion film 305. The LED light emitting device 100 and the second PCB 301 are connected to each other and disposed on one side of the light guide plate 303, the reflective sheet 302 and the brightness enhancement film 304 are disposed on the lower surface and the upper surface of the light guide plate 303, respectively, and the diffusion film 305 is disposed on the upper surface of the brightness enhancement film 304.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention, and still fall within the scope of the technical solution of the present invention.
Claims (3)
1. A blue light prevention packaged LED light-emitting device comprises at least one LED blue light chip, a fluorescence conversion layer is coated on the LED blue light chip, the fluorescence conversion layer comprises white light conversion fluorescent powder and thermosetting colloid, and is characterized in that,
an LED bracket is arranged corresponding to the LED blue light chip, the top of the LED bracket is inwards sunken to form a cup bowl, the LED blue light chip is arranged at the bottom of the cup bowl, and the diameter width of an upper opening of the cup bowl is larger than that of a lower opening of the cup bowl to form a light emitting surface of the LED blue light chip;
the fluorescence conversion layer also comprises a fluorescence conversion material which can absorb blue light with the peak wavelength within the range of 435-475nm to enable the peak wavelength of the blue light to be red-shifted, the fluorescence conversion material is selected from one of LuAG, LuGaAG, GaYAG and gamma-ALON, and the fluorescence conversion layer is covered and filled on the light emitting surface.
2. The encapsulated blue-light LED light emitting device as claimed in claim 1, wherein the thermosetting resin is selected from one of a silicone, a silicone resin or an epoxy resin.
3. A blue light prevention packaged LED backlight module comprises an LED light emitting device, and is characterized in that the LED light emitting device is the blue light prevention packaged LED light emitting device in claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721908217.8U CN210897333U (en) | 2017-12-29 | 2017-12-29 | Blue light prevention packaged LED light-emitting device and backlight module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721908217.8U CN210897333U (en) | 2017-12-29 | 2017-12-29 | Blue light prevention packaged LED light-emitting device and backlight module thereof |
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| Publication Number | Publication Date |
|---|---|
| CN210897333U true CN210897333U (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721908217.8U Active CN210897333U (en) | 2017-12-29 | 2017-12-29 | Blue light prevention packaged LED light-emitting device and backlight module thereof |
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| Country | Link |
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| CN (1) | CN210897333U (en) |
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