WO2022017177A1 - 一种 led 光源及背光模组 - Google Patents

一种 led 光源及背光模组 Download PDF

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Publication number
WO2022017177A1
WO2022017177A1 PCT/CN2021/104821 CN2021104821W WO2022017177A1 WO 2022017177 A1 WO2022017177 A1 WO 2022017177A1 CN 2021104821 W CN2021104821 W CN 2021104821W WO 2022017177 A1 WO2022017177 A1 WO 2022017177A1
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WO
WIPO (PCT)
Prior art keywords
led
light source
led chips
backlight module
chips
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/104821
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English (en)
French (fr)
Inventor
季洪雷
付文静
李泽龙
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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Publication of WO2022017177A1 publication Critical patent/WO2022017177A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations

Definitions

  • the present application relates to the technical field of electronic display, and in particular, to an LED light source and a backlight module.
  • the backlight module of the display device generally adopts a white LED light source, and the light-emitting principle is that a single LED chip emits a high-energy short wave to excite the phosphor to emit light.
  • the short-wavelength light in this LED light source has the characteristics of high energy and strong peaks, which can penetrate the lens and reach the retina, causing the epithelial cells of the retinal pigment to die, causing macular disease, cataract, glaucoma, etc., causing damage to the human eye, and short-term Wavelength light will cause cells to produce oxidative stress and cytotoxins, reduce the antioxidant capacity of fibroblasts, and cause insomnia and visual fatigue.
  • the present application provides an LED light source and a backlight module, so as to solve the problem that the existing LED light source emits high-energy short-wavelength light through a single LED chip to excite phosphors to emit light. injury problem.
  • the embodiments of the present application provide an LED light source, the LED light source includes: an LED bracket and a plurality of LED chips disposed on the LED bracket, wherein at least two dominant wavelengths differ from each other in the plurality of LED chips. The same LED chip.
  • the absolute value of the difference between the respective dominant wavelengths of the at least two LED chips with different dominant wavelengths is greater than or equal to 5 nm and less than or equal to 30 nm.
  • the plurality of LED chips are two LED chips, and each of the LED chips is a blue LED chip.
  • the present application further provides that the wavelength range of the dominant wavelength corresponding to one of the two LED chips is 447.5 nm to 450 nm, and the wavelength range of the dominant wavelength corresponding to the other LED chip is 457.5 nm to 460 nm.
  • the LED bracket includes an LED bracket body and a first side wall and a second side wall arranged on the LED bracket body, and the plurality of LED chips are arranged on the LED bracket body at intervals , and both are located between the first side wall and the second side wall.
  • the LED light source includes an encapsulant, and the encapsulant is located between the first sidewall and the second sidewall and covers the plurality of LED chips.
  • phosphors are arranged in the encapsulating glue.
  • an embodiment of the present application further provides a backlight module, which includes a backplane and a plurality of the LED light sources disposed in the backplane.
  • the backlight module includes a filter film, the filter film is disposed on the back plate, the filter film includes a filter film body and a plurality of filter particles, and the plurality of filter films The light particles are arranged in the filter film body.
  • the thickness of the filter film is 50-300 ⁇ m.
  • the LED light source includes: an LED bracket and a plurality of LED chips arranged on the LED bracket, and there are at least two LED chips with mutually different main wavelengths in the plurality of LED chips.
  • the absolute value of the difference between the respective dominant wavelengths of the at least two LED chips with different dominant wavelengths is greater than or equal to 5 nm and less than or equal to 30 nm.
  • the plurality of LED chips are two LED chips, and each of the LED chips is a blue LED chip.
  • the present application further provides that the wavelength range of the dominant wavelength corresponding to one of the two LED chips is 447.5 nm to 450 nm, and the wavelength range of the dominant wavelength corresponding to the other LED chip is 457.5 nm to 460 nm.
  • the LED bracket includes an LED bracket body and a first side wall and a second side wall arranged on the LED bracket body, and the plurality of LED chips are arranged on the LED bracket body at intervals , and both are located between the first side wall and the second side wall.
  • the LED light source includes an encapsulant, and the encapsulant is located between the first sidewall and the second sidewall and covers the plurality of LED chips.
  • phosphors are arranged in the encapsulating glue.
  • the embodiments of the present application further provide a backlight module, which includes a backplane, a plurality of the LED light sources, a filter film and a quantum dot film disposed in the backplane, and the filter film is provided with On the backplane, the quantum dot film is located between the backplane and the filter film, and a number of filter particles are arranged in the filter film.
  • the LED light source includes: an LED bracket and a plurality of LED chips arranged on the LED bracket, and there are at least two LED chips with different dominant wavelengths among the plurality of LED chips.
  • the absolute value of the difference between the respective dominant wavelengths of the at least two LED chips with different dominant wavelengths is greater than or equal to 5 nm and less than or equal to 30 nm.
  • an embodiment of the present application further provides a display device, including the backlight module described in the second aspect and the third aspect.
  • the LED light source includes an LED bracket and a plurality of LED chips arranged on the LED bracket, and there are at least two LED chips in the plurality of LED chips. LED chips with different dominant wavelengths from each other.
  • the present application reduces the proportion of short-wavelength light in the LED light source by combining multiple LED chips of different wavelengths, solves the problem that the short-wavelength light in the LED light source damages the eyes, and does not affect the brightness and color gamut of the LED light source.
  • FIG. 1 is a schematic structural diagram of an LED light source in the present application.
  • FIG. 2 is an optical test comparison diagram of a conventional LED light source and the LED light source of the present application.
  • FIG. 3 is a schematic structural diagram of an LED bracket in the present application.
  • FIG. 4 is a schematic structural diagram of a backlight module in the present application.
  • the application provides an LED light source and a backlight module.
  • the LED light source can be applied to a backlight module of a display device.
  • the short-wavelength light in the LED light source can be reduced. At the same time, it will not affect the brightness and color gamut of the LED light source.
  • the present application provides an LED light source.
  • an LED light source 1 provided by the present application is applied to a backlight module of a display device to provide a light source for the display device.
  • the LED light source 1 includes an LED bracket 11 and a plurality of LED chips 12 arranged on the LED bracket 11 .
  • the LED bracket 11 plays the role of supporting, conducting, dissipating and protecting the plurality of LED chips 12, and its material can be polyethylene terephthalate (PCT), polyamide ( PA), epoxy molding compound (EMC), polyphthalamide (PPA), sheet molding compound (SMC), etc.
  • PCT polyethylene terephthalate
  • PA polyamide
  • EMC epoxy molding compound
  • PPA polyphthalamide
  • SMC sheet molding compound
  • the plurality of LED chips 12 may be two LED chips 12, and the main wavelengths of the two LED chips 12 are different from each other.
  • the plurality of LED chips 12 can be three LED chips 12, two of the three LED chips 12 have the same dominant wavelength and are different from the dominant wavelength of the other LED chip 12, or the The dominant wavelengths of the three LED chips 12 are all different from each other; and by analogy, the plurality of LED chips 12 can be n LED chips 12, and the n LED chips 12 include two, three, four, or even The dominant wavelengths of the n LED chips 12 are different from each other.
  • the dominant wavelength is the wavelength corresponding to the color of the main light emitted by the light source that can be seen by the human eye.
  • the proportion of short-wavelength light in the LED light source 1 can be reduced, and the LED light source 1 can be reduced.
  • the short-wavelength light in the light source 1 damages the eyes, and does not affect the brightness and color gamut of the LED light source 1 .
  • the combination of the plurality of LED chips 12 with different dominant wavelengths cannot effectively reduce the amount of light in the LED light source 1 . Proportion of short wavelength light. Therefore, in this embodiment, there are at least two LED chips 12 with different dominant wavelengths among the plurality of LED chips 12, and the difference between the respective dominant wavelengths of the at least two LED chips 12 with different dominant wavelengths The absolute value of the value is greater than or equal to 5 nm and less than or equal to 30 nm.
  • the absolute value of the difference between the respective dominant wavelengths of the at least two LED chips 12 with different dominant wavelengths is greater than or equal to 10 nm and less than or equal to 15 nm.
  • the plurality of LED chips 12 are two In the LED chips 12 , the wavelength range of the dominant wavelength of one LED chip 12 is 447.5 nm to 450 nm, and the wavelength range of the dominant wavelength of the other LED chip 12 is 457.5 nm to 460 nm; for another example, the plurality of LED chips 12 are two There are LED chips 12 , wherein the wavelength range of the dominant wavelength of one LED chip 12 is 447.5 nm to 450 nm, and the wavelength range of the dominant wavelength of the other LED chip 12 is 462.5 nm to 465 nm. In this band range, the proportion of short-wavelength light in the LED light source can be effectively reduced without affecting the brightness and color gamut of the LED light source.
  • the short-wavelength light that may cause damage to human eyes in the existing display device is mainly short-wave blue light.
  • the plurality of LED chips 12 are two LED chips 12 , and each of the LED chips 12 is a blue LED chip. By combining two blue LED chips with different dominant wavelengths, the proportion of short-wave blue light in the LED light source 1 can be reduced, the problem of short-wave blue light damaging the eyes can be solved, and the brightness and color gamut of the LED light source 1 will not be affected.
  • the dominant wavelength of the light emitted by the blue LED chip moves to more than 460 nm, the color gamut of the LED light source 1 will be reduced, and the excitation efficiency of the phosphors will be reduced; when the dominant wavelength of the light emitted by the blue LED chip 12 will be When moving below 450nm, short-wave blue light has the characteristics of high energy and strong peaks, which is easy to cause damage to human eyes.
  • the wavelength range of the dominant wavelength corresponding to one LED chip 12 is 447.5 nm to 450 nm
  • the wavelength range of the dominant wavelength corresponding to the other LED chip 12 is 457.5 nm to 460 nm. Controlling the dominant wavelengths of the light emitted by the two LED chips 12 within this range can reduce the proportion of short-wave blue light emitted by the LED light source 1 without affecting the color gamut and phosphor excitation efficiency of the LED light source 1 .
  • the proportion of short-wave blue light refers to the ratio of the brightness of the blue light in the short-wave blue band from 415 nm to 455 nm to the brightness of the total blue band from 400 nm to 500 nm in the wavelength range of 400 nm to 500 nm;
  • the peak ratio It refers to the ratio of the peak value of B light to the peak value of G light;
  • the half-wave width refers to the interval between two wavelengths corresponding to 1/2 of the radiation power of the peak emission wavelength. It can be seen from Table 1 and FIG.
  • the LED light source in the present application adopts dual-combined blue LED chips with dominant wavelengths of 450 nm and 460 nm
  • the conventional LED light source adopts a single blue LED chip with dominant wavelength of 450 nm.
  • the LED light source in this application has the short-wave blue light peak value shifted from 446nm to 456nm, the half-wave width increased from 19nm to 28nm, the short-wave blue light ratio decreased from 47.7% to 31.5%, and the peak ratio decreased from 2 to 28 nm. 1.5, effectively reducing the blue light intensity in the range of 400nm to 450nm in the LED light source, and the brightness and color gamut of the LED light source 1 do not change significantly.
  • the LED bracket 11 includes an LED bracket body 111 and a first side wall 112 and a second side wall 113 disposed on both sides of the LED bracket body 111 .
  • the LED chips 12 are disposed on the LED bracket body 111 at intervals and between the first side wall 112 and the second side wall 113 .
  • the plurality of LED chips 12 are arranged at equal intervals along the long axis direction of the LED bracket body 111 , so that the light source generated by the LED light source 1 is more uniform.
  • the LED light source 1 further includes an encapsulant 13 , the encapsulant 13 is located between the first side wall 112 and the second side wall 113 and covers the plurality of LED chips 12 for The plurality of LED chips 12 are isolated from the air.
  • the encapsulant 13 is epoxy, silica gel, silicone, polyurethane or ultraviolet light curing encapsulant.
  • the encapsulant 13 is silica gel, and using silica gel as the encapsulant 13 has the advantages of heat resistance, UV resistance, water vapor resistance, thermal shock resistance, and low thermal expansion coefficient.
  • the LED light source 1 when used as a white LED light source, phosphors are arranged in the encapsulant 13 , and the phosphors are rare earth yttrium aluminum garnet phosphors (YAG phosphors).
  • YAG phosphors When YAG phosphor is added to the encapsulant 13, the YAG phosphor emits yellow light under blue light radiation, and part of the blue light is converted into yellow light and mixed with the remaining blue light to form a white LED.
  • YAG phosphors when the LED light source 1 is used as a pure blue LED light source, YAG phosphors do not need to be arranged in the encapsulant 13 .
  • each of the LED chips 12 is further provided with a gold wire 14 , and the gold wire 14 is made of a material with Au purity of 99.99% or more by bonding and drawing, and has good electrical conductivity, High ductility and good weldability.
  • the gold wires 14 play the role of wire connection in the packaging of the plurality of LED chips 12, and are used to connect the surface electrodes of the plurality of LED chips 12 to the LED bracket 11. When the current is turned on, the current enters through the gold wires 14.
  • the plurality of LED chips 12 make the plurality of LED chips 12 emit light.
  • the present application also provides a backlight module, which is applied to a display device and used to provide a light source with sufficient brightness and uniform distribution to the display device.
  • the backlight module includes a backplane 2 and a plurality of the above-mentioned LED light sources 1 disposed in the backplane 2 .
  • the backlight module may be a direct type or an edge type.
  • the LED light source 1 is installed at the bottom of the backplane 2; when the backlight module is an edge type, the LED light source 1 is installed on the side of the backplane 2 Department.
  • the backlight module further includes a reflection sheet 3 arranged on the back plate 2 ; an optical film 4 arranged on the reflection sheet 3 .
  • the reflective sheet 3 is arranged under the LED light source 1 to recover the energy of the light source in the LED light source 1 and diffuse the light source.
  • the reflective sheet 3 is coated with optically reflective particles, and the optically reflective particles are polymethyl methacrylate. (PMMA), polybutyl methacrylate (PBMA), nylon, etc.
  • the optical film 4 is used to homogenize the light source emitted by the reflection sheet 3 . In the specific use process, the light emitted by the LED light source 1 is diffused by the reflective sheet 3 and then homogenized by the optical film 4, thereby converting the similar point light source emitted by the LED light source 1 into a uniform surface light source.
  • the optical film 4 includes a diffusion plate from bottom to top, the quantum dot film disposed on the diffusion plate, and the quantum dot film disposed on the quantum dot film.
  • the diffuser plate is used to further diffuse the light emitted from the reflective sheet;
  • the quantum dot film is a barrier film added with quantum dot phosphor powder, and the quantum dot film is used to generate white light;
  • the brightness enhancement film is used to Improve the luminous efficiency of the light source;
  • the filter film includes a filter film body and a plurality of filter particles, the plurality of filter particles are arranged in the filter film body, and the filter film is used to filter out part of harmful light .
  • the optical film when YGA phosphor powder is added to the encapsulant, since the light emitted by the plurality of LED chips can excite the YGA phosphor powder to form white light, the quantum dot film is not required in the optical film to generate white light. That is, from bottom to top, the optical film includes a diffuser plate, a brightness enhancement film arranged on the diffuser plate, and a filter film arranged on the brightness enhancement film.
  • the thickness of the filter film is 50-300 ⁇ m
  • the filter film is made of an optical-grade PET substrate, which is hardened and shaped by applying an anti-scratch coating, silica gel, etc., and its light transmittance reaches more than 92%.
  • the filter film is a blue light filter film
  • the blue light filter film has strict requirements on the blue light blocking rate
  • the blocking rate refers to the ratio of the blue light absorption peak to the total peak value in the range of the wavelength band 440nm to 460nm, If the blocking rate is too low, the blocking effect is not obvious, and if the blocking rate is too high, the harmless blue light will be filtered out at the same time, resulting in display color distortion.
  • the blue light filtering film includes blue light filtering particles for blocking blue light, the blue light filtering particles are blue light blocking dyes or colors, and the blue light filtering particles can be azo (monoazo, disazo), methines, azo-methines (mixtures or compounds of both), ketimides, ketoimidides-methines (mixtures or compounds of both), azo metal complexes, naphthalimides, Nitrodianiline, aminoketone, nitro, anthraquinone, quinoline, azine, xanthene, thioxanthene, benzothiazole, benzimidazole, benzanthrone , benzimidazoles, dihydroacenaphthylenes, spirooxazine-spiropyrans (mixtures or compounds of both), lactones, coumarins, lead chromate, cadmium yellow, oxygen yellow, bismuth vanadate , Aromatic amides, benzidines, organ
  • the blocking rate of the blue light filter film to the light in the 440nm to 460nm band is 20%-24%
  • the transmittance to the light in the 380nm to 780nm band is greater than 80%
  • the haze is greater than 85% .
  • the blue light filtering film in this embodiment can effectively reduce the proportion of high-energy short-wave blue light and at the same time achieve the effect of filtering out some harmful blue light.
  • the present application also provides a display device, which includes the above-mentioned backlight module.
  • the present application provides an LED light source and a backlight module, the LED light source includes: an LED bracket and a plurality of LED chips arranged on the LED bracket; among the plurality of LED chips, there are at least two The main wavelengths of the LED chips are different from each other.
  • the present application reduces the proportion of short-wavelength light in the LED light source by combining multiple LED chips with different dominant wavelengths, solves the problem that the short-wavelength light in the LED light source damages the eyes, and does not affect the brightness and color gamut of the LED light source.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Planar Illumination Modules (AREA)
  • Led Device Packages (AREA)

Abstract

本申请公开了一种LED光源及背光模组，该LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同LED芯片。本申请通过不同主波长的多个LED芯片组合的方式，降低了LED光源中短波长光比例，解决LED光源中短波长光伤眼的问题，且不会影响LED光源的亮度和色域。

Description

一种LED光源及背光模组
本申请要求于2020年7月24日提交中国专利局、申请号为202010721820.5、发明名称为“一种LED光源、背光模组及其显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电子显示技术领域，特别涉及一种LED光源及背光模组。
 背景技术
目前显示装置的背光模组一般采用白光LED光源，其发光原理是通过单个LED芯片发出高能量短波来激发荧光粉发光。这种LED光源中的短波长光具有能量高、尖峰强的特点，可穿透晶状体直达视网膜，导致视网膜色素的上皮细胞衰亡，引起黄斑病、白内障，青光眼等，对人眼造成伤害，且短波长光会使细胞产生氧化应激反应和细胞毒素，降低纤维细胞的抗氧化能力，导致失眠，视觉疲劳。
因此，现有技术还有待于改进和发展。
 技术问题
本申请提供一种LED光源及背光模组，以解决现有LED光源通过单个LED芯片发出高能量短波激发荧光粉发光，其中的短波长光具有能量高、尖峰强的特点，容易对人眼造成伤害的问题。
 技术解决方案
第一方面，本申请实施例提供一种LED光源，该LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片。
本申请的进一步地设置，所述至少两个主波长互不相同的LED芯片各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
本申请的进一步地设置，所述多个LED芯片为两个LED芯片，且各所述LED芯片均为蓝光LED芯片。
本申请的进一步地设置，所述两个LED芯片中一个LED芯片对应的主波长的波长范围为447.5nm 至450nm，另一个LED芯片对应的主波长的波长范围为457.5nm 至460nm。
本申请的进一步地设置，所述LED支架包括LED支架本体和设置于所述LED支架本体上的第一侧壁和第二侧壁，所述多个LED芯片间隔设置于所述LED支架本体上，且均位于所述第一侧壁和所述第二侧壁之间。
本申请的进一步地设置，所述LED光源包括封装胶，所述封装胶位于所述第一侧壁和所述第二侧壁之间，且覆盖所述多个LED芯片。
本申请的进一步地设置，所述封装胶中布置有荧光粉。
第二方面，本申请实施例还提供一种背光模组，包括背板以及设置于所述背板内的多个所述的LED光源。
本申请的进一步地设置，所述背光模组包括滤光膜，所述滤光膜设置于所述背板上，所述滤光膜包括滤光膜本体以及若干滤光粒子，所述若干滤光粒子布置于所述滤光膜本体内。
本申请的进一步地设置，所述滤光膜的厚度为50-300μm。
本申请的进一步地设置，所述LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片。
本申请的进一步地设置，所述至少两个主波长互不相同的LED芯片各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
本申请的进一步地设置，所述多个LED芯片为两个LED芯片，且各所述LED芯片均为蓝光LED芯片。
本申请的进一步地设置，所述两个LED芯片中一个LED芯片对应的主波长的波长范围为447.5nm至450nm，另一个LED芯片对应的主波长的波长范围为457.5nm至460nm。
本申请的进一步地设置，所述LED支架包括LED支架本体和设置于所述LED支架本体上的第一侧壁和第二侧壁，所述多个LED芯片间隔设置于所述LED支架本体上，且均位于所述第一侧壁和所述第二侧壁之间。
本申请的进一步地设置，所述LED光源包括封装胶，所述封装胶位于所述第一侧壁和所述第二侧壁之间，且覆盖所述多个LED芯片。
本申请的进一步地设置，所述封装胶中布置有荧光粉。
第三方面，本申请实施例还提供一种背光模组，包括背板以及设置于所述背板内的多个所述的LED光源、滤光膜以及量子点膜，所述滤光膜设置于所述背板上，所述量子点膜位于所述背板与所述滤光膜之间，所述滤光膜内布置有若干滤光粒子。
本申请的进一步地设置，所述LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片
本申请的进一步地设置，所述至少两个主波长互不相同的LED芯片各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
第四方面，本申请实施例还提供一种显示装置，包括第二方面和第三方面所述的背光模组。
 有益效果
相较于现有技术，本申请提供的LED光源及背光模组中，所述LED光源包括LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片。本申请通过不同波长多个LED芯片组合的方式，降低了LED光源中短波长光比例，解决LED光源中短波长光伤眼的问题，且不会影响LED光源的亮度和色域。
 附图说明
图1是本申请中LED光源的结构示意图。
图2是常规LED光源与本申请中LED光源的光学测试对比图。
图3是本申请中LED支架的结构示意图。
图4是本申请中背光模组的结构示意图。
附图中各标记：11、LED支架；12、LED芯片；13、封装胶；14、金线；111、LED支架本体；112、第一侧壁；113、第二侧壁；1、LED光源；2、背板；3、反射片；4、光学膜片。
 本发明的实施方式
本申请提供一种LED光源及背光模组，该LED光源可应用于显示装置的背光模组上，通过发出不同主波长的光的多个LED芯片组合的方式，在降低LED光源中短波长光比例的同时，不会影响LED光源的亮度和色域。为使本申请的目的、技术方案及效果更加清楚、明确，以下参照附图并举实例对本申请进一步详细说明。应当理解，此处所描述的具体实施例仅用以解释本申请，并不用于限定本申请。
在实施方式和申请专利范围中，除非文中对于冠词有特别限定，否则“一”与“所述”可泛指单一个或复数个。
另外，若本申请实施例中有涉及“第一”、“第二”等的描述，则该“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本申请要求的保护范围之内。
请参阅图1～图4，本申请提供了一种LED光源。
如图1所示，本申请所提供的一种LED光源1，该LED光源1应用于显示装置的背光模组上，用于为显示装置提供光源。其中，所述LED光源1包括LED支架11以及设置于所述LED支架11上的多个LED芯片12。所述LED支架11对所述多个LED芯片12起支撑、导电、散热和保护的作用，其材料可以为聚对苯二甲酸1,4-环己烷二甲醇酯（PCT）、聚酰胺（PA）、环氧塑封料（EMC）、聚邻苯二甲酰胺（PPA）、片状模塑料（SMC）等。所述多个LED芯片12中存在至少两个主波长互不相同的LED芯片，例如，所述多个LED芯片12可以为两个LED芯片12，所述两个LED芯片12的主波长互不相同；所述多个LED芯片12可以为三个LED芯片12，所述三个LED芯片12中有两个LED芯片12的主波长相同并与另一个LED芯片12的主波长不同，或者所述三个LED芯片12的主波长都互不相同；依此类推，所述多个LED芯片12可以为n个LED芯片12，所述n个LED芯片12有两个，三个、四个，甚至n个LED芯片12的主波长互不相同。主波长为人眼能够看到光源发出的主要光的颜色所对应的波长，本实施例中通过不同主波长的多个LED芯片12组合的方式，可以降低LED光源1中短波长光比例，解决LED光源1中短波长光伤眼的问题，且不会影响LED光源1的亮度和色域。
具体地，若所述多个LED芯片12中各LED芯片12所发出的光的主波长均相同或接近，则通过不同主波长的多个LED芯片12组合的方式，无法有效降低LED光源1中短波长光比例。因此，本实施例中所述多个LED芯片12中存在至少两个主波长互不相同的LED芯片12，且所述至少两个主波长互不相同的LED芯片12各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
进一步地，考虑到多个LED芯片12中各LED芯片12所发出的光的主波长相差太大，在降低LED光源中短波长比例的同时会影响LED光源的亮度和色域。本实施例中所述至少两个主波长互不相同的LED芯片12各自对应的主波长的差值绝对值大于或者等于10nm且小于或者等于15nm，例如，所述多个LED芯片12为两个LED芯片12，其中一个LED芯片12的主波长的波长范围为447.5nm至450nm，另一个LED芯片12的主波长的波长范围为457.5 nm至460nm；又如，所述多个LED芯片12为两个LED芯片12，其中一个LED芯片12的主波长的波长范围为447.5nm至450nm，另一个LED芯片12的主波长的波长范围为462.5 nm至465nm。在此波段范围内能够有效降低LED光源中短波长光比例，又不至于影响LED光源的亮度和色域。
由于现有显示装置的背光模组一般采用高能量短波蓝光激发荧光粉发光，因而现有显示装置中会对人眼造成伤害的短波长光主要为短波蓝光。为了解决短波蓝光伤眼的问题，在一具体实施方式中，所述多个LED芯片12为两个LED芯片12，且各所述LED芯片12均为蓝光LED芯片。通过两个不同主波长的蓝光LED芯片组合的方式，可以降低LED光源1中短波蓝光比例，解决短波蓝光伤眼的问题，且不会影响LED光源1的亮度和色域。
进一步地，考虑到当蓝光LED芯片发出的光的主波长往460nm以上移动时，会使LED光源1色域降低，同时使荧光粉激发效率降低；当蓝光LED芯片12发出的光的主波长往450nm以下移动时，短波蓝光具有能量高、尖峰强的特点，容易对人眼造成伤害。本实施例中所述两个LED芯片12中一个LED芯片12对应的主波长的波长范围为447.5nm至450nm，另一个LED芯片12对应的主波长的波长范围为457.5nm至460nm。将两个LED芯片12发出的光的主波长控制在该范围内，能够使LED光源1发出的光的短波蓝光比例降低，又不至于影响LED光源1的色域以及荧光粉激发效率。
为了验证本申请中上述方案的有效性，请参照表1和图2所示，发明人从亮度、短波蓝光占比、峰值波长、尖峰比值、半波宽和色域等方面对常规LED光源和本申请中提供的LED光源进行光学性能测试；其中，短波蓝光占比指波长在400nm至500nm范围内，短波蓝光波段从415nm至455nm的蓝光亮度占总蓝光波段400nm至500nm亮度的比值；尖峰比值指B光峰值与G光峰值的比值；半波宽指峰值发射波长的辐射功率的1/2所对应两波长的间隔。由表1和图2可以看出，本申请中的LED光源采用主波长为450nm和460nm的双组合蓝光LED芯片，常规LED光源采用主波长为450nm的单一蓝光LED芯片。本申请中的LED光源与常规LED光源相比，短波蓝光尖峰峰值从446nm移动到456nm，半波宽从19nm增加至28nm，短波蓝光占比从47.7%降低到31.5%，尖峰比值从2降低到1.5，有效减少了LED光源中400nm至450nm范围内的蓝光强度，且LED光源1的亮度和色域没有明显变化。
表1 本申请LED光源与常规LED光源光学测试数据
蓝光芯片主波长 亮度(cd/m2) 短波蓝光占比 峰值波长(nm) 尖峰比值 半波宽（nm） 色域
450nm 356 47.7% 446 2 19 90.32%
450nm+460nm 352 31.5% 456 1.5 28 89.91%
请结合图1和图3所示，具体地，所述LED支架11包括LED支架本体111和设置于所述LED支架本体111两侧的第一侧壁112和第二侧壁113，所述多个LED芯片12间隔设置于所述LED支架本体111上并位于所述第一侧壁112和所述第二侧壁113之间。所述多个LED芯片12沿所述LED支架本体111的长轴方向等间隔设置，从而使得LED光源1产生的光源更加均匀。
具体地，所述LED光源1还包括封装胶13，所述封装胶13位于所述第一侧壁112和所述第二侧壁113之间，并覆盖所述多个LED芯片12，用于将所述多个LED芯片12与空气隔绝。所述封装胶13为环氧类、硅胶、有机硅类、聚氨酯类或紫外线光固化封装胶等。在一具体实施例中，所述封装胶13为硅胶，使用硅胶作为封装胶13具有耐热性、耐UV、耐水蒸汽性、耐冷热冲击性、低热膨胀系数等优点。
在一些实施例中，当所述LED光源1作为白光LED光源使用时，所述封装胶13中布置有荧光粉，所述荧光粉为稀土钇铝石榴石荧光粉（YAG荧光粉）。当封装胶13中添加有YAG荧光粉时，YAG荧光粉在蓝光辐射下会发射黄光，部分蓝光转变成黄光和剩余的蓝光混合而形成白光LED。在另一些实施例中，所述LED光源1作为纯蓝光LED光源使用时，则所述封装胶13中不需要布置YAG荧光粉。
请继续参照图1，具体地，各个所述LED芯片12上还分别设置有金线14，所述金线14是由Au纯度为99.99%以上的材质键合拉丝而成，具有导电性好、延展性高和焊接性好等优点。金线14在所述多个LED芯片12封装中起到导线连接的作用，用于将所述多个LED芯片12表面电极和LED支架11连接，当导通电流时，电流通过金线14进入所述多个LED芯片12，使所述多个LED芯片12发光。
本申请还提供了一种背光模组，该背光模组应用于显示装置，用于对显示装置提供亮度充足且分布均匀的光源。请参照图4所示，该背光模组包括背板2以及设置于所述背板2内的多个上述所述的LED光源1，所述LED光源1的具体结构如上所述，在此不再赘述。所述背光模组可以为直下式，也可以为侧入式。当所述背光模组为直下式时，所述LED光源1安装于所述背板2底部；当所述背光模组为侧入式时，所述LED光源1安装于所述背板2侧部。
请继续参照图4，具体地，所述背光模组还包括设置于所述背板2上的反射片3；设置于所述反射片3上的光学膜片4。所述反射片3设置于LED光源1下面，用于回收LED光源1中光源能量并扩散光源，所述反射片3上涂布有光学反射颗粒，所述光学反射颗粒为聚甲基丙烯酸甲酯（PMMA）、聚甲基丙烯酸丁酯（PBMA）、尼龙等。所述光学膜片4用于对反射片3发出的光源进行均匀化。具体使用过程中，LED光源1发出的光经过反射片3扩散，再经过光学膜片4均匀化，从而将LED光源1发出的类似点光源转换为均匀的面光源。
进一步地，当封装胶13中未布置YGA荧光粉时，所述光学膜片4由下至上依次包括扩散板，设置于所述扩散板上的量子点膜，设置于所述量子点膜上的增亮膜，设置于所述增亮膜上的滤光膜。所述扩散板用于对从反射片发射出来的光进一步扩散；所述量子点膜为添加有量子点荧光粉的阻隔膜，所述量子点膜用于产生白光；所述增亮膜用于提高光源的发光效率；所述滤光膜包括滤光膜本体以及若干滤光粒子，所述若干滤光粒子布置于所述滤光膜本体内，所述滤光膜用于滤除部分有害光。
具体地，所述量子点膜中量子点材料可以为Ⅲ-Ⅴ族元素组成的第一化合物包括CdSe、SrSe、ZnSe、CdTe、CaSe、ZnS、CaS、MgS、SrS、BaS、MgTe、ZnTe、SrTe、MgSe、CaTe、BaSe、BaTe和CdS中的任意一种，或者为Ⅱ-Ⅵ族元素组成的第二化合物包括GaAs、GaP、InP、InN、GaN和InAs中的任意一种，或者第三化合物包括有机-无机杂化钙钛矿(CH3NH3PbX3, X = Cl, Br, I)材料，或者第四化合物包括全无机钙钛矿铯铅卤量子点（CsPbX3，X=Cl，Br，I），或者第一化合物和/ 或第二化合物和/ 或第三化合物和/ 或第四化合物中的多种包覆形成的核壳结构化合物或者掺杂纳米晶。量子点膜中的量子点在蓝光照射下生成红光和绿光，并同部分透过薄膜的蓝光一起混合得到白光，进而实现显示装置的高色域显示。
在一具体实施方式中，当封装胶中添加了YGA荧光粉时，由于所述多个LED芯片发出的光可以激发YGA荧光粉形成白光，则所述光学膜片中不需要量子点膜产生白光，即所述光学膜片由下至上依次包括扩散板，设置于所述扩散板上的增亮膜，设置于所述增亮膜上的滤光膜。
具体地，所述滤光膜的厚度为50-300μm，所述滤光膜采用光学级PET基材，经过涂抹抗刮涂层、硅胶等硬化定型而成，其透光率达到92%以上。在一具体实施方式中，所述滤光膜为滤蓝光膜，所述滤蓝光膜对蓝光阻隔率有严格要求，阻隔率是指在波段440nm至460nm范围内蓝光吸收峰值占总峰值的比值，阻隔率过低，阻隔效果不明显，阻隔率过高，会同时过滤掉无害蓝光，导致显示颜色失真。所述滤蓝光膜中包括用于阻隔蓝光的滤蓝光粒子，所述滤蓝光粒子为阻隔蓝光染料或颜色，所述滤蓝光粒子可以是偶氮类（单偶氮类、双偶氮类），甲川类，偶氮-甲川类（两者的混合物或化合物），酮亚酰胺类，酮亚酰胺-甲川类（两者的混合物或化合物），偶氮金属络合类，萘酰亚胺类，硝基二苯胺类，氨基酮类，硝基类，蒽醌类，喹啉类，吖嗪类，咕吨类，硫咕吨类，苯并噻唑类，苯并咪唑类，苯并蒽酮类，苯并咪唑类，二氢苊类，螺恶嗪-螺吡喃类（两者的混合物或化合物），内酯型，香豆素类，铬酸铅，镉黄，氧黄，钒酸铋，芳酰胺，联苯胺，有机金属络合物，偶氮钙盐及其它偶氮盐类，异吲哚啉酮，喹吖酞酮，蒽嘧啶，黄烷士酮，异吲哚啉，偶氮缩合，双偶氮缩合，二芳基邻酰苯，蒽醌，邻苯胺，苯并咪唑酮中的一种多种。通过厚度与滤蓝光粒子的搭配，使得所述滤蓝光膜对440nm至460nm波段光的阻隔率在20%-24%，对380nm至780nm波段光的透过率大于80%，雾度大于85%。相较于传统的滤蓝光膜，本实施例中的滤蓝光膜能够有效降低高能短波蓝光占比的同时，达到滤除部分有害蓝光的效果。
本申请还提供了一种显示装置，该显示装置包括上述所述的背光模组。
综上所述，本申请所提供的一种LED光源及背光模组，该LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片；所述多个LED芯片中存在至少两个主波长互不相同LED芯片。本申请通过不同主波长的多个LED芯片组合的方式，降低了LED光源中短波长光比例，解决LED光源中短波长光伤眼的问题，且不会影响LED光源的亮度和色域。
应当理解的是，本申请的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本申请所附权利要求的保护范围。

Claims (20)

  1. 一种LED光源，其包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片。
  2. 根据权利要求1所述的LED光源，其中，所述至少两个主波长互不相同的LED芯片各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
  3. 根据权利要求1所述的LED光源，其中，所述多个LED芯片为两个LED芯片，且各所述LED芯片均为蓝光LED芯片。
  4. 根据权利要求3所述的LED光源，其中，所述两个LED芯片中一个LED芯片对应的主波长的波长范围为447.5nm至450nm，另一个LED芯片对应的主波长的波长范围为457.5nm至460nm。
  5. 根据权利要求3所述的LED光源，其中，所述LED支架包括LED支架本体和设置于所述LED支架本体上的第一侧壁和第二侧壁，所述多个LED芯片间隔设置于所述LED支架本体上，且均位于所述第一侧壁和所述第二侧壁之间。
  6. 根据权利要求5所述的LED光源，其中，所述LED光源包括封装胶，所述封装胶位于所述第一侧壁和所述第二侧壁之间，且覆盖所述多个LED芯片。
  7. 根据权利要求6所述的LED光源，其中，所述封装胶中布置有荧光粉。
  8. 一种背光模组，其中，包括背板以及设置于所述背板内的多个如权利要求1所述的LED光源。
  9. 根据权利要求8所述的背光模组，其中，所述背光模组包括滤光膜，所述滤光膜设置于所述背板上，所述滤光膜包括滤光膜本体以及若干滤光粒子，所述若干滤光粒子布置于所述滤光膜本体内。
  10. 根据权利要求9所述的背光模组，其中，所述滤光膜的厚度为50-300μm。
  11. 根据权利要求8所述的背光模组，其中，所述LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片。
  12. 根据权利要求11所述的背光模组，其中，所述至少两个主波长互不相同的LED芯片各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
  13. 根据权利要求11所述的背光模组，其中，所述多个LED芯片为两个LED芯片，且各所述LED芯片均为蓝光LED芯片。
  14. 根据权利要求13所述的背光模组，其中，所述两个LED芯片中一个LED芯片对应的主波长的波长范围为447.5nm至450nm，另一个LED芯片对应的主波长的波长范围为457.5nm至460nm。
  15. 根据权利要求13所述的背光模组，其中，所述LED支架包括LED支架本体和设置于所述LED支架本体上的第一侧壁和第二侧壁，所述多个LED芯片间隔设置于所述LED支架本体上，且均位于所述第一侧壁和所述第二侧壁之间。
  16. 根据权利要求15所述的背光模组，其中，所述LED光源包括封装胶，所述封装胶位于所述第一侧壁和所述第二侧壁之间，且覆盖所述多个LED芯片。
  17. 根据权利要求16所述的背光模组，其中，所述封装胶中布置有荧光粉。
  18. 一种背光模组，其中，包括背板以及设置于所述背板内的多个如权利要求1所述的LED光源、滤光膜以及量子点膜，所述滤光膜设置于所述背板上，所述量子点膜位于所述背板与所述滤光膜之间，所述滤光膜内布置有若干滤光粒子。
  19. 根据权利要求18所述的背光模组，其中，所述LED光源包括：LED支架以及设置于所述LED支架上的多个LED芯片，所述多个LED芯片中存在至少两个主波长互不相同的LED芯片。
  20. 根据权利要求19所述的背光模组，其中，所述至少两个主波长互不相同的LED芯片各自对应的主波长的差值绝对值大于或者等于5nm且小于或者等于30nm。
PCT/CN2021/104821 2020-07-24 2021-07-06 一种 led 光源及背光模组 Ceased WO2022017177A1 (zh)

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