CN114578613A - Backlight module containing fluorescent powder and quantum dots - Google Patents

Backlight module containing fluorescent powder and quantum dots Download PDF

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Publication number
CN114578613A
CN114578613A CN202011378618.3A CN202011378618A CN114578613A CN 114578613 A CN114578613 A CN 114578613A CN 202011378618 A CN202011378618 A CN 202011378618A CN 114578613 A CN114578613 A CN 114578613A
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green quantum
backlight module
quantum dot
layer
light source
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CN202011378618.3A
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Chinese (zh)
Inventor
曾焕伟
周君玮
蔡佳怡
廖佳君
林士尧
张学仁
高立升
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Unique Materials Co ltd
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Unique Materials Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

A backlight module comprises a light source, an encapsulation layer and a green quantum dot film. The light source emits blue light. The encapsulation layer encapsulates the light source. The packaging layer comprises red fluorescent powder and yellow fluorescent powder. The green quantum dot film is disposed over the light source and the encapsulation layer. The blue light is transmitted through the encapsulation layer and the green quantum dot film to be output as white light. The display device comprising the backlight module is also provided.

Description

Backlight module containing fluorescent powder and quantum dots
Technical Field
The present invention relates to a backlight module, and more particularly, to a backlight module containing phosphor and quantum dots.
Background
In the backlight module for display in the market at present, the output of white light is mostly achieved by adding yellow fluorescent powder to a blue light emitting diode chip. However, the above configuration may make the full width at half maximum of the red and green light of the spectrum in the display too wide, which may result in a narrow color gamut. Therefore, how to improve the conventional backlight module to achieve a wider color gamut is an important issue.
Disclosure of Invention
The invention provides a backlight module with fluorescent powder and quantum dots, which can realize wider color gamut to improve the display effect of display equipment.
The invention provides a backlight module which comprises a light source, an encapsulation layer and a green quantum dot film. The light source emits blue light. The encapsulation layer encapsulates the light source. The packaging layer comprises red fluorescent powder and yellow fluorescent powder. The green quantum dot film is disposed over the light source and the encapsulation layer. The blue light is transmitted through the encapsulation layer and the green quantum dot film to be output as white light.
In an embodiment of the invention, the backlight module further includes: the light guide plate is arranged between the light source and the green quantum dot film; and the reflecting layer is arranged on the back surface of the light guide plate and used for reflecting the blue light emitted by the light source to the green quantum dot film.
In an embodiment of the invention, the yellow phosphor is Y3Al5O12:Ce3+(YAG)。
In an embodiment of the invention, the red phosphor is K2SiF6:Mn4+(KSF)。
In an embodiment of the invention, the green quantum dot film includes or does not include a substrate.
In an embodiment of the invention, the green quantum dot film includes a green quantum dot layer.
In an embodiment of the invention, the substrate may be disposed on an upper side, a lower side, or both upper and lower sides of the green quantum dot layer.
In an embodiment of the invention, the substrate may or may not include a gas barrier layer therein.
In an embodiment of the invention, the green quantum dot layer includes a resin material and a plurality of green quantum dots dispersed and embedded in the resin material. The resin material includes acrylic resin (acrylate resin), epoxy resin (epoxy resin) or silicone resin (silicone).
In an embodiment of the invention, each green quantum dot in the green quantum dot layer has a core, a core-shell, a core-multishell, a core-alloy layer-shell, a core-alloy layer-multishell, or a combination thereof.
In an embodiment of the invention, each green quantum dot in the green quantum dot layer includes a core, and the material of the core is at least one selected from CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, SiC, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Si, Ge, PbS, PbSe, PbTe, and alloys thereof.
In an embodiment of the invention, each green quantum dot in the green quantum dot layer includes a shell, and the material of the shell is at least one selected from ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, PbTe, and alloys thereof.
The invention provides a display device comprising the backlight module.
In an embodiment of the invention, the display device further includes: the display panel is configured at one side of the backlight module.
Based on the above, in the backlight module of the present invention, the blue light source is encapsulated by the encapsulation layer containing the red phosphor and the yellow phosphor and the encapsulation layer is matched with the green quantum dot film, so as to make up for the defect of the color gamut of the display device using a single yellow phosphor, and further improve the color gamut and the display effect of the display device having the backlight module.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view illustrating a backlight module according to another embodiment of the present invention;
FIG. 3 is an enlarged schematic view of a quantum dot layer according to an embodiment of the invention;
FIG. 4 is a graph of the luminous intensity of the backlight module of experimental example 1 and comparative example 1 as a function of wavelength;
fig. 5 is a chromaticity diagram (chromaticity diagram) of the displays of experimental example 1 and comparative example 1.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings of the present embodiments. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. The thickness of layers and regions in the drawings may be exaggerated for clarity. The same or similar reference numerals denote the same or similar components, and the following paragraphs will not be repeated.
Fig. 1 is a schematic cross-sectional view of a display device according to an embodiment of the invention. Fig. 2 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention.
Referring to fig. 1, a display device 10 according to an embodiment of the invention includes a backlight module 100 and a display panel 200. The backlight module 100 is disposed at one side of the display panel 200 (e.g., a lower side of the display panel 200). In some embodiments, the display panel 200 may be, but is not limited to, a liquid crystal display panel. The composition and configuration of the liquid crystal display panel are well known to those skilled in the optical arts and will not be described in detail herein.
In some embodiments, the backlight module 100 includes a light guide plate 102, a plurality of light source packages 103, a green quantum dot film 110, and a reflective layer 108. The light guide plate 102 has a light emitting surface 102a and a light incident surface 102b disposed opposite to each other. In the present embodiment, as shown in fig. 1, the cross-sectional view of the light guide plate 102 is rectangular. In alternative embodiments, the cross-sectional view of the light guide plate 102 may also be triangular, trapezoidal, or other suitable shapes. In one embodiment, the light guide medium (medium) in the light guide plate 102 may include transparent plastic, glass, or a material that can be used to guide light. In alternative embodiments, the light guide plate 102 may be polymethyl methacrylate (PMMA), Polycarbonate (PC), Polyethylene terephthalate (PET), Polyimide (PI), or other suitable materials. In other embodiments, the haze of the light guide plate 102 gradually increases or is consistent from the light incident surface 102b to the light emitting surface 102 a. Herein, the Haze (Haze) is the percentage of the light intensity of the partial transmitted light beam which deviates from the incident direction by more than 2.5 degrees to the total transmitted light beam, and can be used to evaluate the scattering condition of the transparent medium. That is, the greater the haze of the transparent medium, the lower its gloss and transparency (or degree of imaging). Conversely, the smaller the haze of the transparent medium, the higher the gloss and transparency (or image formation).
As shown in fig. 1, the light source package 103 is disposed at the light incident surface 102b of the light guide plate 102 to form a Direct-lit (Direct-lit) structure. In another embodiment, the light source package 103 may also be disposed at a side of the light guide plate 102 to form an Edge-lit (Edge-lit) structure. In an embodiment, the light source package 103 may be a light emitting diode package (LED package) or other suitable light emitting device packages. For example, the light source package 103 is a blue LED package.
The light source package 103 includes a light source 104 and an encapsulation layer 106. The encapsulation layer 106 may encapsulate the light source 104. In an embodiment, as shown in fig. 2, the encapsulation layer 106 may encapsulate a single light source 104 (e.g., an LED chip disposed in a cavity). Specifically, the encapsulation layer 106 may include red phosphor 105, yellow phosphor 107, and encapsulation glue 109. The red phosphor 105 and the yellow phosphor 107 are uniformly mixed in the packaging adhesive 109 according to a certain proportion. In some embodiments, red phosphor 105 may be a phosphor material having a dominant emission wavelength of 590nm to 680nm, such as, but not limited to, KSF (K)2SiF6:Mn4+)、CaAlSiN3:Eu2+、YVO4:Eu3+、LiEuW2O8、Y2O2S:Eu3+Or a combination thereof. The yellow phosphor 107 may be a phosphor material having a dominant emission wavelength of 530nm to 580nm, such as, but not limited to, YAG (Y)3Al5O12:Ce3+)。
As shown in fig. 2, the blue light emitted from the light source 104 is transmitted through the encapsulation layer 106 to form a mixed light ML having a mixture of blue light, red light, and yellow light, which is transmitted to the light guide plate 102 (fig. 1) and transmitted through the light guide plate 102 to the green quantum dot film 110. Then, the blue light in the mixed light ML is partially converted into green light by the green quantum dot film 110, and the mixed light ML and the green light are mixed into white light WL and transmitted to the display panel 200 (fig. 1) on the green quantum dot film 110.
It is noted that, in the present embodiment, the blue light source 104 can be encapsulated by the encapsulation layer 106 containing the red phosphor 105 and the yellow phosphor 107, and the green quantum dot film 110 is matched to output the white light WL. In this case, the red phosphor 105 and the green quantum dot film 110 with narrower full widths at half maximum can effectively make up for the insufficient color gamut generated by the combination of the blue LED and the yellow phosphor in the conventional backlight module, so as to increase the color gamut of the display device 10, thereby improving the display effect.
Referring back to fig. 1, the reflective layer 108 is disposed on the back surface 102b of the light guide plate 102 to reflect the mixed light ML emitted by the light source 104 through the encapsulation layer 106 into the green quantum dot film 110, so as to improve the application efficiency of the mixed light ML and further improve the light emitting efficiency of the backlight module 100. In one embodiment, the material of the reflective layer 108 includes a metal material with reflective effect, such as gold, silver, aluminum, copper, or other suitable metal material.
The green quantum dot film 110 may be disposed on the light emitting surface 102a of the light guide plate 102. Specifically, the green quantum dot film 110 may include a green quantum dot layer 112. The green quantum dot layer 112 may include a plurality of green quantum dots dispersed and embedded in a resin material. In one embodiment, as shown in fig. 2, the green quantum dot film 110 includes two substrates 111 and a green quantum dot layer 112 interposed between the two substrates 111. In some embodiments, the substrate 111 may include polyethylene terephthalate (PET), acrylic resin (acrylate resin), epoxy resin (epoxy resin), silicone, and the like. In another embodiment, the substrate 111 may be an optical film having other optical properties, such as a brightness enhancement film, a polarizing film, a scattering film, a light diffusion film, and the like. In alternative embodiments, the substrate 111 may include a gas barrier layer (e.g., diamond-like carbon film, silicon oxide layer, titanium oxide layer, aluminum oxide layer, silicon nitride layer, etc.) therein to effectively block external environmental factors such as moisture, oxygen, volatile substances, etc. In other embodiments, the substrate 111 may not include a gas barrier layer therein. Although fig. 2 illustrates that the green quantum dot film 110 includes two substrates 111, the invention is not limited thereto. In other embodiments, the green quantum dot film 110 may also include a single substrate 111 disposed above or below the green quantum dot film 110. In addition, the green quantum dot film 110 may not include any substrate 111. That is, the green quantum dot layer 112 may directly contact the light emitting surface 102a of the light guide plate 102.
In addition, the backlight module 100 of the present embodiment may further include other optical films, such as a brightness enhancement film, a polarizing film, a scattering film, a light diffusion film, and the like. The optical film can be selectively disposed above and below the green quantum dot film 110 or disposed above and below the green quantum dot film 110, respectively.
Fig. 3 is an enlarged schematic view of a quantum dot layer according to an embodiment of the invention. In the following embodiments, the quantum dot layer 120 of fig. 3 can be, but is not limited to, the green quantum dot layer 112 illustrated in fig. 2.
Specifically, as shown in fig. 3, the quantum dot layer 120 includes a luminescent material 122 dispersed and embedded in a resin material 124. In one embodiment, the luminescent material 122 is contained in an amount of 0.01 to 15 weight percent. In the present embodiment, the luminescent material 122 comprises quantum dots. The quantum dots comprise a core, a core-shell, a core-alloy layer-shell, or a combination thereof. The particle size or size of the quantum dots can be adjusted according to the requirement (for example, emitting visible light of different colors), and the invention is not limited thereto.
In an embodiment, the "core" may be, for example, at least one selected from the group consisting of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, SiC, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Si, Ge, PbS, PbSe, PbTe, and alloys thereof. In one embodiment, the "shell" is, for example, at least one selected from ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, PbTe, and alloys thereof. The core or the shell may be selected according to different requirements, but the invention is not limited thereto.
In one embodiment, the resin material 124 is present in an amount of 85 to 99.99 weight percent. In some embodiments, the resin material 124 may be an acrylic resin, an epoxy resin, a silicone (silicone), or a combination thereof. Specifically, the resin material 124 is prepared from a precursor. The precursor comprises: 30 to 50 weight percent of a first acrylate monomer, 15 to 30 weight percent of a second acrylate monomer, 5 to 30 weight percent of a surfactant having a thiol group, 5 to 20 weight percent of a crosslinker, and 1 to 2 weight percent of an initiator. In an alternative embodiment, the surfactant is present in an amount less than the amount of the first acrylate monomer. In some embodiments, quantum dot layer 120 may include precursors of the same material composition or precursors of different material compositions. In other embodiments, the quantum dot layer 120 may include the same content of the luminescent material 122, the resin material 124, or different contents of the luminescent material 122, the resin material 124.
The present invention will be described more specifically below with reference to experimental examples of the present invention. However, the materials, methods of use, and the like shown in the following experimental examples may be modified as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the experimental examples shown below.
Comparative example 1
Yellow phosphor (YAG) and encapsulant (available from Dow)
Figure BDA0002808787640000061
OE-6370HF) are mixed and used for packaging blue LED chips to form LED packages. Then, the LED packages are used in a light bar of a backlight module to assemble the backlight module, and a luminance meter (luminometer) is used to measure the light emitting state, and the result is shown in fig. 4. Then, the backlight module forms a displayThe color gamut was measured, and the results are shown in FIG. 5.
Experimental example 1
Firstly, green quantum dots and acrylic resin are mixed and then clamped between two substrates, and the green quantum dots are cured into a green quantum dot film through UV. Then, red phosphor (KSF), yellow phosphor (YAG) and encapsulant (available from Dow)
Figure BDA0002808787640000062
OE-6370HF) are mixed and used for packaging blue LED chips to form LED packages. Then, the LED package and the green quantum dot film are arranged as in the configuration of the backlight module 100 of fig. 1, and the luminance status is measured by using a luminance meter, and the result is shown in fig. 4. Then, the backlight module is combined into a display and the color gamut is measured, and the result is shown in fig. 5.
Referring to fig. 4, since the red phosphor (KSF) and the green quantum dot film of experimental example 1 have narrower full widths at half maximum, it can effectively make up for the color gamut of the yellow phosphor in comparative example 1, so as to achieve the effect of color compensation. In addition, as shown in fig. 5, compared to comparative example 1, the display of experimental example 1 having the red phosphor (KSF), the yellow phosphor (YAG), and the green quantum dot film has a wider color gamut, thereby improving the color fidelity and the display effect of the display.
In summary, in the backlight module of the present invention, the blue light source is encapsulated by the encapsulation layer containing the red phosphor and the yellow phosphor and the green quantum dot film is matched to make up for the defect of the color gamut of the display device using a single yellow phosphor, so as to improve the color gamut and the display effect of the display device having the backlight module.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims (14)

1. A backlight module, comprising:
a light source emitting blue light;
an encapsulation layer encapsulating the light source, wherein the encapsulation layer comprises red phosphor and yellow phosphor; and
a green quantum dot film disposed over the light source and the encapsulation layer, wherein the blue light is transmitted through the encapsulation layer and the green quantum dot film to output as white light.
2. The backlight module of claim 1, further comprising:
a light guide plate disposed between the light source and the green quantum dot film; and
and the reflecting layer is configured on the back surface of the light guide plate so as to reflect the blue light emitted by the light source into the green quantum dot film.
3. The backlight module of claim 1, wherein the yellow phosphor is Y3Al5O12:Ce3+(YAG)。
4. The backlight module of claim 1, wherein the red phosphor is K2SiF6:Mn4+(KSF)。
5. The backlight module of claim 1, wherein the green quantum dot film comprises or does not comprise a substrate.
6. The backlight module defined in claim 5 wherein the green quantum dot film comprises a layer of green quantum dots.
7. The backlight module of claim 6, wherein the substrate is disposed on the upper side, the lower side, or both the upper and lower sides of the green quantum dot layer.
8. The backlight module of claim 5, wherein the substrate comprises or does not comprise a gas barrier layer therein.
9. The backlight module of claim 6, wherein the layer of green quantum dots comprises a resin material and a plurality of green quantum dots dispersed and embedded in the resin material, wherein the resin material comprises an acrylic, an epoxy, or a silicone.
10. The backlight module of claim 6 wherein each green quantum dot in the layer of green quantum dots has a configuration of core, core-shell, core-multishell, core-alloy layer-shell, core-alloy layer-multishell, or a combination of the foregoing.
11. The backlight module defined in claim 6 wherein each green quantum dot in the layer of green quantum dots comprises a core of a material selected from at least one of CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, HgS, HgSe, HgTe, GaN, GaP, GaAs, InP, InAs, InSb, AlN, AlP, AlAs, AlSb, SiC, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Si, Ge, PbS, PbSe, PbTe, and alloys thereof.
12. The backlight module defined in claim 6 wherein each green quantum dot in the layer of green quantum dots comprises a shell of a material selected from at least one of ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, PbTe and alloys thereof.
13. A display device, comprising: a backlight module as claimed in any one of claims 1 to 12.
14. The display device according to claim 13, further comprising: the display panel is configured at one side of the backlight module.
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