WO2022267058A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2022267058A1
WO2022267058A1 PCT/CN2021/102542 CN2021102542W WO2022267058A1 WO 2022267058 A1 WO2022267058 A1 WO 2022267058A1 CN 2021102542 W CN2021102542 W CN 2021102542W WO 2022267058 A1 WO2022267058 A1 WO 2022267058A1
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WO
WIPO (PCT)
Prior art keywords
light
emitting
area
backlight module
module according
Prior art date
Application number
PCT/CN2021/102542
Other languages
English (en)
French (fr)
Inventor
秦沛
浩育涛
李冬磊
刘辉
王硕
李佳昕
陈英
高杰
余鸿昊
Original Assignee
京东方科技集团股份有限公司
京东方晶芯科技有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司, 京东方晶芯科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2021/102542 priority Critical patent/WO2022267058A1/zh
Priority to CN202180001678.XA priority patent/CN115917419A/zh
Priority to US17/837,630 priority patent/US11630348B2/en
Publication of WO2022267058A1 publication Critical patent/WO2022267058A1/zh

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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
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
    • 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
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the present disclosure relates to the field of display technology, in particular to a backlight module and a display device.
  • the display device includes a backlight module and a display panel.
  • the backlight module is used to provide a light source for the display panel.
  • the display panel generally includes a lower polarizer, an array substrate, a liquid crystal layer, a color filter substrate, and an upper polarizer arranged in sequence.
  • the backlight module emits The light from the light passes through the lower polarizer, the array substrate, the liquid crystal layer, the color filter substrate and the upper polarizer in sequence, and finally realizes the display.
  • the display effect of the display device is poor.
  • the purpose of the present disclosure is to provide a backlight module and a display device, which can improve the display effect.
  • a backlight module including:
  • the middle frame is set on the backboard
  • the light-emitting substrate is arranged on the back plate and is located in the middle frame.
  • the light-emitting substrate includes a first light-emitting area and a second light-emitting area surrounding the first light-emitting area.
  • the second light-emitting area is close to the the edge of the light-emitting substrate;
  • a light compensation structure near the edge of the light-emitting substrate, the light compensation structure includes a light conversion material.
  • the surface of the light-emitting substrate facing away from the back plate is provided with a protective layer, the area of the protective layer corresponding to the second light-emitting region is doped with light conversion particles, and the protective layer is doped with the light
  • the regions of the conversion particles constitute the light compensation structure.
  • the light emission color of the light-emitting substrate is blue, and the light conversion particles are yellow light conversion materials.
  • the light output color of the light-emitting substrate is blue
  • the light conversion particles include red light conversion material and green light conversion material.
  • the backlight module further includes a A color conversion layer on one side, the color conversion layer includes a red light conversion material and a green light conversion material or the color conversion layer includes a yellow light conversion material.
  • the backlight module further includes a color conversion layer disposed on the side of the light-emitting substrate away from the backplane, the color conversion layer is a green quantum dot layer, and the protective layer corresponds to the first A region of the light emitting region is doped with a red light converting material.
  • the protective layer is encapsulation glue.
  • the light-emitting substrate includes:
  • the protective layer includes a plurality of protective units, one protective unit covers the light-emitting surface of one light-emitting unit, and is in direct contact with the light-emitting surface of the light-emitting unit, and the surface of the protective unit facing away from the light-emitting unit is surface.
  • the doping concentration of the light conversion particles gradually decreases along the direction that the edge of the protection layer approaches the inside of the protection layer.
  • optical compensation structure is arranged on the inner wall of the middle frame.
  • optical compensation structure includes:
  • a plurality of light conversion units are all arranged on the inner wall of the middle frame.
  • the inner wall of the middle frame provided with the light conversion unit includes a first area and a second area with the same area, the first area is located on the side of the second area away from the light-emitting substrate, and is located on the The density of the light conversion units in the first region is greater than the density of the light conversion units in the second region.
  • the inner wall of the middle frame on which the light conversion unit is provided includes a first area and a second area, the first area is located on the side of the second area away from the light-emitting substrate, and is located on the second area.
  • the size of the light conversion unit in one area is larger than the size of the light conversion unit in the second area.
  • the middle frame includes a first frame segment and a second frame segment connected to each other, the first frame segment is set on the back plate, and the second frame segment is set at a distance from the first frame segment On one side of the back plate, the inner diameter of the second frame segment gradually increases along the direction away from the first frame segment, the first area is located on the inner wall of the second frame segment, and the second The area is located on the inner wall of the first frame segment.
  • a reflective sheet is provided on the inner wall of the middle frame, and the light conversion unit is provided on the reflective sheet.
  • the light output color of the light-emitting substrate is blue
  • the light conversion unit is a yellow light conversion unit.
  • the light conversion material is a fluorescent material or a quantum dot material.
  • a display device includes the above-mentioned backlight module.
  • the second light-emitting area is close to the edge of the light-emitting substrate
  • the light compensation structure is close to the edge of the light-emitting substrate
  • the light compensation structure includes a light conversion material, so that the light compensation structure is in the second light-emitting area.
  • Light of a specific color can be emitted under the irradiation of the emitted light, and the light of the specific color emitted by the light compensation structure is mixed with the emitted light of the second light-emitting area, which can solve the problem that the light emitted from the second light-emitting area passes through the dimming film and the middle frame
  • the color shift problem caused by the gap between them improves the display effect.
  • FIG. 1 is an exploded schematic diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 3 is a schematic diagram of a light emitting substrate according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram of a light-emitting substrate provided with a protective layer according to an embodiment of the present disclosure.
  • FIG. 5 is another schematic diagram of a display device according to an embodiment of the present disclosure.
  • FIG. 6 is a partial structural schematic diagram of the structure shown in FIG. 5 .
  • FIG. 7 is a top view of the structure shown in FIG. 6 .
  • FIG. 8 is a schematic diagram of distribution of light conversion units according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of distribution of light conversion units according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a light-emitting substrate provided with a protective layer in an embodiment of the present disclosure.
  • a backlight module of a display device includes a light-emitting substrate, a dimming film, and a middle frame.
  • the light-adjusting film is laminated with the light-emitting substrate, and the light-adjusting film is located on the light-emitting side of the light-emitting substrate, and is used for modulating the emitted light of the light-emitting substrate, such as performing color conversion.
  • the middle frame surrounds the light-emitting substrate and the dimming film.
  • the dimming film shrinks when the temperature is low, resulting in a gap between the dimming film and the middle frame, so that the emitted light of the light-emitting substrate passes through the gap between the dimming film and the middle frame, thereby forming a gradient
  • the color shift reduces the display effect of the display device.
  • the embodiments of the present disclosure provide a backlight module.
  • the backlight module is applied to a display device.
  • the backlight module includes a backplane 1, a middle frame 3, a light-emitting substrate 2 and an optical compensation structure 100, wherein:
  • the middle frame 3 is disposed on the backplane 1 .
  • the light-emitting substrate 2 is disposed on the backplane 1 and located in the middle frame 3 .
  • the light emitting substrate 2 includes a first light emitting region 203 and a second light emitting region 204 surrounding the first light emitting region 203 .
  • the second light emitting region 204 is close to the edge of the light emitting substrate 2 .
  • the light compensation structure 100 is close to the edge of the light emitting substrate 2, and the light compensation structure 100 includes a light conversion material.
  • the second light-emitting region 204 is located at the edge of the light-emitting substrate 2, the light compensation structure 100 is close to the edge of the light-emitting substrate 2, and the light compensation structure 100 includes a light conversion material, which is used to convert The color of the light emitted by the light-emitting substrate 2, so that the light compensation structure 100 can emit light of a specific color under the illumination of the second light-emitting region 204.
  • the mixing of the emitted light can solve the problem of color shift caused by the emitted light from the second light emitting region 204 passing through the gap between the light-adjusting film and the middle frame 3 , thereby improving the display effect.
  • the backplane 1 is the supporting structure of the backlight module.
  • One side of the backboard 1 is provided with a bearing surface.
  • the middle frame 3 can be disposed on the bearing surface of the backplane 1 .
  • the middle frame 3 may include a first frame segment 301 and a second frame segment 302.
  • the first frame segment 301 and the second frame segment 302 are connected to each other.
  • the first frame segment 301 may be disposed on the backplane 1
  • the second frame segment 302 may be disposed on a side of the first frame segment 301 away from the backplane 1 .
  • the inner diameter of the second frame segment 302 becomes gradually larger.
  • the surface of the inner wall of the second frame segment 302 may be a smoothly transitioned curved surface.
  • the first frame segment 301 has a uniform inner diameter.
  • the inner wall diameter of the second frame segment 302 may be larger than the inner wall diameter of the first frame segment 301 .
  • the middle frame 3 may include a plastic frame.
  • the light-emitting substrate 2 can be disposed on the carrying surface of the backplane 1 , that is, the light-emitting substrate 2 and the middle frame 3 are located on the same side of the backplane 1 . Wherein, the light-emitting side of the light-emitting substrate 2 faces away from the backplane 1 .
  • the light-emitting substrate 2 is located in the middle frame 3 , that is, the middle frame 3 surrounds the light-emitting substrate 2 .
  • the light emitting substrate 2 may include a substrate 201 and a plurality of light emitting units 202 .
  • the substrate 201 can be disposed on the carrying surface of the backplane 1 , and the plurality of light emitting units 202 are all disposed on the surface of the substrate 201 facing away from the backplane 1 .
  • the substrate 201 can be a circuit board to provide power to the light emitting units 202 .
  • the light emitting colors of the plurality of light emitting units 202 may be the same, for example, all are green.
  • the light-emitting unit 202 can be a light-emitting chip, such as a mini LED or the like.
  • the light-emitting substrate 2 may include a first light-emitting region 203 and a second light-emitting region 204, the first light-emitting region 203 may be block-shaped, and the second light-emitting region 204 may be ring-shaped shape, the second light emitting region 204 can surround the first light emitting region 203 .
  • the second light emitting region 204 is close to the edge of the light emitting substrate 2 .
  • the outer boundary of the block-shaped first light emitting region 203 may coincide with the inner boundary of the second light emitting region 204 , but this is not particularly limited in the embodiments of the present disclosure.
  • the emitted light of the first light emitting region 203 is the emitted light of the light emitting unit 202 located in the first light emitting region 203
  • the emitted light of the second light emitting region 204 is the emitted light of the light emitting unit 202 located in the second light emitting region 204 .
  • the light-emitting substrate 2 can be a lamp panel, of course, the light-emitting substrate 2 can also be spliced by a plurality of lamp panels.
  • the surface of the light-emitting substrate 2 facing away from the backplane 1 may be provided with a protective layer 4 , that is, the protective layer 4 covers the above-mentioned plurality of light-emitting units 202 and the substrate 201 to prevent the light-emitting units 202 from being damaged. damage.
  • the protection layer 4 can be encapsulation glue.
  • the protection layer 4 may include a plurality of protection units 401.
  • a protection unit 401 covers a light emitting surface of a light emitting unit 202 and is in direct contact with the light emitting surface of the light emitting unit 202 .
  • the surface of the protection unit 401 facing away from the light emitting unit is a curved surface.
  • the region of the protection layer 4 corresponding to the second light emitting region 204 can be doped with light conversion particles 5 , that is, the protection unit 401 corresponding to the second light emission region 204 among the plurality of protection units 401 can be doped with light conversion particles 5 .
  • the light conversion particle 5 includes the above-mentioned light conversion material. Wherein, from the inside of the light-emitting substrate 2 to the edge of the light-emitting substrate 2, the luminous intensity of the light-emitting substrate 2 gradually decreases, along the direction that the edge of the protective layer 4 is close to the inside of the protective layer 4, that is, from the edge of the protective layer 4 to the protective layer. In the inner direction of the layer 4, the doping concentration of the light converting particles 5 becomes gradually smaller.
  • the formation process of the protection layer 4 may include: forming a plurality of protection units 401 by dispensing on the side of the plurality of light emitting units 202 away from the substrate 201, the protection The light emitting surface of the unit 401 is a curved surface; one protection unit 401 of the plurality of protection units 401 covers the light emitting surface of one of the plurality of light emitting units, and is in direct contact with the light emitting surface of the light emitting unit.
  • the dispensing process step may include: mixing the transparent colloid material and the light conversion particles 5 to form the protection unit 401 through the dispensing process.
  • the preparation method of the protective layer 4 includes: performing solder paste printing on the substrate 201, chip bonding, reflow soldering, cleaning, and then A transparent encapsulant is dropped into the first area of the light-emitting substrate 2 , an encapsulant doped with light conversion particles 5 is dropped in the second area of the light-emitting substrate 2 , and finally baked and cured.
  • the backlight module according to the embodiment of the present disclosure may further include a dimming film.
  • the light-adjusting film is arranged on the side of the light-emitting substrate 2 away from the backplane 1 , and at least part of the thickness direction of the light-adjusting film is located in the middle frame 3 .
  • the dimming film may include a color conversion layer 6 .
  • the color conversion layer 6 is disposed on the side of the light-emitting substrate 2 away from the backplane 1 , that is, the color conversion layer 6 faces the light-emitting side of the light-emitting substrate 2 .
  • the color conversion layer 6 is used for color conversion of the emitted light from the light emitting substrate 2 .
  • the dimming film may also include a prism sheet 7 .
  • the prism sheet 7 can be disposed on the side of the color conversion layer 6 away from the light-emitting substrate 2 .
  • the dimming film may also include a diffusion sheet 9 .
  • the diffusion sheet 9 can be located on the side of the color conversion layer 6 close to the light-emitting substrate 2 .
  • the light emission color of the light-emitting substrate 2 is blue, that is, the light-emitting substrate 2 emits blue light
  • the area of the protective layer 4 corresponding to the second light-emitting region 204 is doped
  • the light conversion particle 5 is a yellow light conversion material, and the yellow light conversion material emits yellow light under the irradiation of blue light, so that the area of the protective layer 4 corresponding to the second light emitting region 204 emits yellow light under the irradiation of blue light, and the yellow light Light and blue light are mixed to form white light
  • the blue light emitted by the light-emitting substrate 2 passes through the area of the protective layer 4 corresponding to the first light-emitting region 203 and becomes blue light, that is, the area of the protective layer 4 corresponding to the first light-emitting region 203 is not doped with light conversion particles 5
  • the color conversion layer 6 includes a red light conversion material and a green light conversion material
  • the light emission color of the light-emitting substrate 2 is blue
  • the light-converting particles 5 doped in the protective layer 4 corresponding to the second light-emitting region 204 include Red light conversion material and green light conversion material
  • the blue light emitted by the light-emitting substrate 2 passes through the area of the protective layer 4 corresponding to the first light-emitting region 203 and becomes blue light
  • the color conversion layer 6 includes red light conversion material and green light conversion material.
  • the light emission color of the light-emitting substrate 2 is blue
  • the light conversion particles 5 doped in the protective layer 4 corresponding to the second light-emitting region 204 are Yellow light conversion material
  • the blue light emitted from the first light emitting region 203 of the light emitting substrate 2 passes through the protective layer 4 and becomes blue light
  • the color conversion layer 6 includes a yellow light conversion material.
  • the light output color of the light-emitting substrate 2 is blue
  • the light-converting particles 5 doped in the protective layer 4 corresponding to the second light-emitting region 204 include Red light conversion material and green light conversion material
  • the blue light emitted by the light-emitting substrate 2 passes through the area of the protective layer 4 corresponding to the first light-emitting region 203 and becomes blue light
  • the color conversion layer 6 includes yellow light conversion material.
  • the light emission color of the light-emitting substrate 2 is blue
  • the light conversion particles 5 doped in the region corresponding to the second light-emitting region 204 of the protective layer 4 include red Light-converting material and green light-converting material
  • the region of the protective layer 4 corresponding to the first light-emitting region 203 is doped with a red light-converting material
  • the color-converting layer 6 is a green quantum dot layer, and the green quantum dot layer is illuminated by blue light Can emit green light.
  • the optical compensation structure 100 can be arranged between the light-emitting substrate 2 and the color conversion layer 6, that is to say, the optical compensation structure 100 is located on the side of the light-emitting substrate 2 away from the backplane 1, and the color conversion The layer 6 is located on the side of the light compensation structure 100 away from the backplane 1 .
  • the orthographic projection of the optical compensation structure 100 on the backplane 1 does not coincide with the orthographic projection of the first light-emitting region 203 of the light-emitting substrate 2 on the backplane 1, that is, in a direction parallel to the backplane 1, the optical compensation
  • the structure 100 is located on one side of the first light emitting region 203, and since the second light emitting region 204 is also located on one side of the first light emitting region 203, the light compensation structure 100 is located close to the first light emitting region 203, so that the light compensation The light emitted from the structure 100 is easy to mix with the light emitted from the first light emitting region 203 .
  • the orthographic projection of the light compensation structure 100 on the backplane 1 surrounds the orthographic projection of the first light emitting region 203 on the backplane 1 .
  • the light compensation structure 100 includes a light conversion material for converting the color of the light emitted by the light emitting substrate 2 .
  • the light conversion material includes fluorescent material or quantum dot material, and of course, phosphorescent material may also be included.
  • the fluorescent material can be an organic fluorescent material, an inorganic fluorescent material or a fluorescent dye.
  • the light compensation structure 100 can be arranged on the light-emitting substrate 2. Specifically, the region of the protective layer 4 corresponding to the second light-emitting region 204 is doped with light-converting particles 5, which constitute the light-emitting region 204. Compensation structure 100. Certainly, as shown in FIG. 5 and FIG. 6 , the optical compensation structure 100 may also be disposed on the inner wall of the middle frame 3 . The light compensation structure 100 disposed on the inner wall of the middle frame 3 may include a plurality of light conversion units 10 .
  • the light conversion unit 10 includes the above-mentioned light conversion material.
  • the light conversion unit 10 can be a yellow light conversion unit 10 , that is, the light conversion unit 10 can emit yellow light under the irradiation of blue light.
  • a plurality of light conversion units 10 may be distributed on the inner wall of the middle frame 3 at intervals. Wherein, as shown in FIG.
  • the inner wall of the middle frame 3 provided with the light conversion unit 10 includes a first area 303 and a second area 304 with the same area, and the first area 303 is located on the side of the second area 304 away from the light-emitting substrate 2
  • the density of the light conversion units 10 disposed in the first area 303 is greater than the density of the light conversion units 10 disposed in the second area 304, that is, the number of light conversion units 10 disposed in the first area 303 is greater than that of the light conversion units 10 disposed in the second area 303.
  • the number of light conversion units 10 in the second region 304 is shown in FIG.
  • the size of the light conversion unit 10 disposed in the first region 303 is larger than the size of the light conversion unit 10 disposed in the second region 304 , that is, the size of the light conversion unit 10 disposed in the first region 304
  • the mass of the light conversion material contained in the light conversion unit 10 in the area 303 is greater than the mass of the light conversion material contained in the light conversion unit 10 disposed in the second area 304 .
  • the middle frame 3 as an example including a first frame segment 301 and a second frame segment 302 connected to each other, the first area 303 can be located on the inner wall of the second frame segment 302, and the second area 304 can be located on the inner wall of the first frame segment 301. inner wall.
  • the inner wall diameter of the second frame segment 302 is larger than the inner wall diameter of the first frame segment 301, the light intensity emitted from the light-emitting substrate 2 to the second frame segment 302 is smaller than the light emitted from the light-emitting substrate 2 to the first frame segment 301. strength.
  • the inner wall of the middle frame 3 may also be provided with a reflective sheet, and the light conversion unit 10 is disposed on the reflective sheet.
  • the embodiment of the present disclosure also provides a display device.
  • the display device may include the backlight module described in any one of the above implementation manners.
  • the display device may also include a display panel 8 . Since the backlight module included in the display device according to the embodiment of the present disclosure is the same as the backlight module in the embodiment of the above-mentioned backlight module, it has the same beneficial effect, and the present disclosure will not repeat it here.

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

Abstract

一种背光模组及显示装置，背光模组包括：背板(1)；中框(3)，设于背板(1)上；发光基板(2)，设于背板(1)上，且位于中框(3)内，发光基板(2)包括第一发光区(203)以及围绕第一发光区(203)的第二发光区(204)，第二发光区(204)靠近发光基板(2)的边缘；光补偿结构(100)，靠近发光基板(2)的边缘，光补偿结构(100)包括光转换材料。背光模组及显示装置能够提高显示效果。

Description

背光模组及显示装置 技术领域
本公开涉及显示技术领域，尤其涉及一种背光模组及显示装置。
背景技术
随着显示技术的发展，显示装置引起了人们越来越多的关注。
显示装置包括背光模组和显示面板，背光模组用于向显示面板提供光源，显示面板一般包括依次设置的下偏振片、阵列基板、液晶层、彩膜基板和上偏振片，背光模组发出的光线依次穿过下偏振片、阵列基板、液晶层、彩膜基板和上偏振片，最终实现显示。然而，该显示装置的显示效果较差。
发明内容
本公开的目的在于提供一种背光模组及显示装置，能够提高显示效果。
根据本公开的一个方面，提供一种背光模组，包括：
背板；
中框，设于所述背板上；
发光基板，设于所述背板上，且位于所述中框内，所述发光基板包括第一发光区以及围绕所述第一发光区的第二发光区，所述第二发光区靠近所述发光基板的边缘；
光补偿结构，靠近所述发光基板的边缘，所述光补偿结构包括光转换材料。
进一步地，所述发光基板背向所述背板的表面设有保护层，所述保护层对应于所述第二发光区的区域掺杂光转换颗粒，所述保护层掺杂有所述光转换颗粒的区域构成所述光补偿结构。
进一步地，所述发光基板的出光色为蓝色，所述光转换颗粒为黄色光转换材料。
进一步地，所述发光基板的出光色为蓝色，所述光转换颗粒包括红色光转换材料和绿色光转换材料。
进一步地，所述第一发光区出射的光通过所述保护层对应于所述第一发光区的区域后为蓝光，所述背光模组还包括设于所述发光基板远离所述背板的一侧的色转换层，所述色转换层包括红色光转换材料和绿色光转换材料或者所述色转换层包括黄色光转换材料。
进一步地，所述背光模组还包括设于所述发光基板远离所述背板的一侧的色转换层，所述色转换层为绿色量子点层，所述保护层对应于所述第一发光区的区域掺杂红色光转换材料。
进一步地，所述保护层为封装胶。
进一步地，所述发光基板包括：
衬底，设于所述背板上；
多个发光单元，设于所述衬底背向所述背板的表面；
所述保护层包括多个保护单元，一个所述保护单元覆盖一个所述发光单元的出光面，且与所述发光单元的出光面直接接触，所述保护单元背向所述发光单元的表面为曲面。
进一步地，沿着所述保护层的边缘靠近所述保护层的内部的方向，所述光转换颗粒的掺杂浓度逐渐变小。
进一步地，所述光补偿结构设于所述中框的内壁。
进一步地，所述光补偿结构包括：
多个光转换单元，均设于所述中框的内壁。
进一步地，设有所述光转换单元的所述中框内壁包括面积相同的第一区域和第二区域，所述第一区域位于所述第二区域远离所述发光基板的一侧，设于所述第一区域的所述光转换单元的密度大于设于所述第二区域的光转换单元的密度。
进一步地，设有所述光转换单元的所述中框内壁包括第一区域和第二区域，所述第一区域位于所述第二区域远离所述发光基板的一侧，设于所述第一区域的所述光转换单元的尺寸大于设于所述第二区域的光转换单元的尺寸。
进一步地，所述中框包括相互连接的第一框段和第二框段，所述第一框段设于所述背板上，所述第二框段设于所述第一框段远离所述背板的一侧，沿着远离所述第一框段的方向所述第二框段的内径逐渐变大，所述第一区域位于所述第二框段的内壁，所述第二区域位于所述第一框段的内壁。
进一步地，所述中框内壁设有反射片，所述光转换单元设于所述反射片上。
进一步地，所述发光基板的出光色为蓝色，所述光转换单元为黄色光转换单元。
进一步地，所述光转换材料为荧光材料或量子点材料。
根据本公开的一个方面，提供一种显示装置，所述显示装置包括上述的背光模组。
本公开的背光模组及显示装置，该第二发光区靠近发光基板的边缘，光补偿结构靠近发光基板的边缘，且光补偿结构包括光转换材料，从而使光补偿结构在第二发光区的出射光的照射下可以出射特定颜色的光，该光补偿结构出射的特定颜色的光与第二发光区的出射光混合，可以解决由于第二发 光区的出射光穿过调光膜与中框之间的缝隙所导致的色偏问题，提高了显示效果。
附图说明
图1是本公开实施方式的显示装置的爆炸示意图。
图2是本公开实施方式的显示装置的示意图。
图3是本公开实施方式的发光基板的示意图。
图4是本公开实施方式的设有保护层的发光基板的示意图。
图5是本公开实施方式的显示装置的另一示意图。
图6是图5所示结构的部分结构示意图。
图7是图6所示结构的俯视图。
图8是本公开实施方式的光转换单元的分布示意图。
图9是本公开实施方式的光转换单元的分布示意图。
图10是本公开实施方式中设有保护层的发光基板的示意图。
附图标记说明：1、背板；2、发光基板；201、衬底；202、发光单元；203、第一发光区；204、第二发光区；3、中框；301、第一框段；302、第二框段；303、第一区域；304、第二区域；4、保护层；401、保护单元；5、光转换颗粒；6、色转换层；7、棱镜片；8、显示面板；9、扩散片；10、光转换单元；100、光补偿结构。
具体实施方式
这里将详细地对示例性实施方式进行说明，其示例表示在附图中。下面的描述涉及附图时，除非另有表示，不同附图中的相同数字表示相同或相似的要素。以下示例性实施方式中所描述的实施方式并不代表与本公开相一 致的所有实施方式。相反，它们仅是与如所附权利要求书中所详述的、本公开的一些方面相一致的装置的例子。
相关技术中，显示装置的背光模组包括发光基板、调光膜以及中框。该调光膜与发光基板层叠设置，且调光膜位于发光基板的出光侧，用于发光基板的出射光进行调制，例如进行颜色转换。该中框围绕发光基板和调光膜。然而，该调光膜在温度较低时发生收缩，导致调光膜与中框之间存在间隙，从而使发光基板的出射光穿过调光膜与中框之间的间隙，进而形成渐变的色偏，降低了显示装置的显示效果。
本公开实施方式提供一种背光模组。该背光模组应用于显示装置。如图1、图2以及图5所示，该背光模组包括背板1、中框3、发光基板2以及光补偿结构100，其中：
该中框3设于背板1上。该发光基板2设于背板1上，且位于中框3内。该发光基板2包括第一发光区203以及围绕第一发光区203的第二发光区204。该第二发光区204靠近发光基板2的边缘。该光补偿结构100靠近发光基板2的边缘，该光补偿结构100包括光转换材料。
本公开实施方式的背光模组，该第二发光区204位于发光基板2的边缘，光补偿结构100靠近发光基板2的边缘，且光补偿结构100包括光转换材料，该光转换材料用于转换发光基板2发出的光线的颜色，从而使光补偿结构100在第二发光区204的照射下可以出射特定颜色的光，该光补偿结构100出射的特定颜色的光与第二发光区204的出射光混合，可以解决由于第二发光区204的出射光穿过调光膜与中框3之间的缝隙所导致的色偏问题，提高了显示效果。
下面对本公开实施方式的背光模组进行详细说明：
如图2所示，该背板1为背光模组的支撑结构。该背板1的一侧设有承载面。该中框3可以设于背板1的承载面上。如图5和图6所示，沿着垂 直于背板1的方向，该中框3可以包括第一框段301和第二框段302。该第一框段301和第二框段302相互连接。该第一框段301可以设于背板1上，该第二框段302可以设于第一框段301远离背板1的一侧。沿着远离第一框段301的方向，该第二框段302的内径逐渐变大。其中，该第二框段302的内壁的表面可以为平滑过渡的曲面。在垂直于背板1的方向上，该第一框段301具有均匀的内径。其中，第二框段302的内壁直径可以大于第一框段301的内壁直径。此外，该中框3可以包括胶框。
如图2和图3所示，该发光基板2可以设于背板1的承载面上，即发光基板2与中框3位于背板1的同一侧。其中，该发光基板2的出光侧背向背板1。该发光基板2位于中框3内，也就是说，中框3围绕发光基板2。该发光基板2可以包括衬底201和多个发光单元202。该衬底201可以设于背板1的承载面上，该多个发光单元202均设于衬底201背向背板1的表面。该衬底201可以为电路板，以向多个发光单元202提供电能。多个发光单元202的出光色可以相同，例如，均为绿色等。该发光单元202可以为发光芯片，例如mini LED等。此外，在平行于背板1的方向上，该发光基板2可以包括第一发光区203和第二发光区204，该第一发光区203可以呈块状，该第二发光区204可以呈环状，该第二发光区204可以围绕第一发光区203。该第二发光区204靠近发光基板2的边缘。呈块状的第一发光区203的外边界可以与第二发光区204的内边界重合，但本公开实施方式对此不做特殊限定。该第一发光区203的出射光即为位于第一发光区203的发光单元202的出射光，该第二发光区204的出射光即为位于第二发光区204的发光单元202的出射光。如图3和图7所示，该发光基板2可以为灯板，当然，该发光基板2也可以由多个灯板拼接而成。
如图2所示，该发光基板2背向背板1的表面可以设有保护层4，也就是说，该保护层4覆盖上述的多个发光单元202以及衬底201，以防止发光单元202受到损伤。举例而言，该保护层4可以为封装胶。如图10所示，该保 护层4可以包括多个保护单元401。一个保护单元401覆盖一个发光单元202的出光面，且与发光单元202的出光面直接接触。该保护单元401背向所述发光单元的表面为曲面。该保护层4对应于第二发光区204的区域可以掺杂光转换颗粒5，即多个保护单元401中对应于第二发光区204的保护单元401可以掺杂光转换颗粒5。该光转换颗粒5包括上述的光转换材料。其中，从发光基板2内部到发光基板2的边缘，发光基板2的发光强度逐渐减小，沿着保护层4的边缘靠近保护层4的内部的方向，也就是从保护层4的边缘指向保护层4的内部的方向，光转换颗粒5的掺杂浓度逐渐变小。以保护层4包括多个保护单元401为例，该保护层4的形成过程可以包括：在多个发光单元202远离衬底201的一侧，通过点胶工艺形成多个保护单元401，该保护单元401的出光面为曲面；多个保护单元401中的一个保护单元401覆盖多个发光单元中的一个发光单元的出光面，且与发光单元的出光面直接接触。其中，对于掺杂有光转换颗粒5的保护单元401，点胶工艺步骤可以包括：将透明胶体材料和光转换颗粒5混合，通过点胶工艺形成保护单元401。
以发光基板2包括衬底201和发光芯片且保护层4为封装胶为例，该保护层4的制备方法包括：在衬底201上进行锡膏印刷、芯片固晶、回流焊、清洗，接着在发光基板2的第一区域滴入透明封装胶，在发光基板2的第二区域滴入掺杂光转换颗粒5的封装胶，最后进行烘烤固化。
如图2和图5所示，本公开实施方式的背光模组还可以包括调光膜。该调光膜设于发光基板2远离背板1的一侧，且调光膜的厚度方向上的至少部分区域位于中框3内。该调光膜可以包括色转换层6。该色转换层6设于发光基板2远离背板1的一侧，即色转换层6面向发光基板2的出光侧。该色转换层6用于对发光基板2的出射光进行颜色转换。该调光膜还可以包括棱镜片7。该棱镜片7可以设于色转换层6远离发光基板2的一侧。该调光膜还可以包括扩散片9。该扩散片9可以位于色转换层6靠近发光基板2的一侧。
在本公开一实施方式中，如图2和图4所示，该发光基板2的出光色 为蓝色，即发光基板2出射蓝光，该保护层4对应于第二发光区204的区域掺杂的光转换颗粒5为黄色光转换材料，该黄色光转换材料在蓝光的照射下出射黄光，以使保护层4对应于第二发光区204的区域在蓝光的照射下出射黄光，该黄光和蓝光混合形成白光；该发光基板2出射的蓝光通过保护层4对应于第一发光区203的区域后为蓝光，即保护层4对应于第一发光区203的区域未掺杂光转换颗粒5；该色转换层6包括红色光转换材料和绿色光转换材料，该红色光转换材料在蓝光的照射下可以出射红光，该绿色光转换材料在蓝光的照射下可以出射绿光，以使色转换层6在蓝光的照射下出射红光和绿光。
在本公开另一实施方式中，如图2和图4所示，该发光基板2的出光色为蓝色，该保护层4对应于第二发光区204的区域掺杂的光转换颗粒5包括红色光转换材料和绿色光转换材料；该发光基板2出射的蓝光通过保护层4对应于第一发光区203的区域后为蓝光；该色转换层6包括红色光转换材料和绿色光转换材料。
在本公开又一实施方式中，如图2和图4所示，该发光基板2的出光色为蓝色，该保护层4对应于第二发光区204的区域掺杂的光转换颗粒5为黄色光转换材料；该发光基板2的第一发光区203出射的蓝光通过保护层4后为蓝光；该色转换层6包括黄色光转换材料。
在本公开再一实施方式中，如图2和图4所示，该发光基板2的出光色为蓝色，该保护层4对应于第二发光区204的区域掺杂的光转换颗粒5包括红色光转换材料和绿色光转换材料；该发光基板2出射的蓝光通过保护层4对应于第一发光区203的区域后为蓝光；该色转换层6包括黄色光转换材料。
在本公开其它实施方式中，如图2和图4所示，该发光基板2的出光色为蓝色，该保护层4对应于第二发光区204的区域掺杂的光转换颗粒5包括红色光转换材料和绿色光转换材料；该保护层4对应于第一发光区203的区域掺杂红色光转换材料；该色转换层6为绿色量子点层，该绿色量子点层 在蓝光的照射下可以出射绿光。
如图2和图5所示，该光补偿结构100可以设于发光基板2与色转换层6之间，也就是说，光补偿结构100位于发光基板2远离背板1的一侧，色转换层6位于光补偿结构100远离背板1的一侧。该光补偿结构100在背板1上的正投影与发光基板2的第一发光区203在背板1上的正投影不重合，也就是说，在与背板1平行的方向上，光补偿结构100位于第一发光区203的一侧，且由于第二发光区204也位于第一发光区203的一侧，从而使光补偿结构100设于靠近第一发光区203的位置，使光补偿结构100出射的光易于与第一发光区203出射的光混合。进一步地，该光补偿结构100在背板1上的正投影围绕第一发光区203在背板1上的正投影。该光补偿结构100包括光转换材料，该光转换材料用于转换发光基板2发出的光线的颜色。该光转换材料包括荧光材料或量子点材料，当然，也可以包括磷光材料。该荧光材料可以为有机荧光材料、无机荧光材料或荧光染料。
如图2和图4所示，该光补偿结构100可以设于发光基板2上，具体地，上述保护层4对应于第二发光区204的区域掺杂有光转换颗粒5，其构成该光补偿结构100。当然，如图5和图6所示，该光补偿结构100也可以设于中框3的内壁。设于中框3内壁的光补偿结构100可以包括多个光转换单元10。该光转换单元10包括上述的光转换材料。以发光基板2的出射光为蓝光为例，该光转换单元10可以为黄色光转换单元10，也就是说，光转换单元10在蓝光的照射下可以出射黄光。多个光转换单元10可以间隔分布于中框3的内壁。其中，如图8所示，设有光转换单元10的中框3内壁包括面积相同的第一区域303和第二区域304，该第一区域303位于第二区域304远离发光基板2的一侧，设于第一区域303的光转换单元10的密度大于设于第二区域304的光转换单元10的密度，也就是说，设于第一区域303的光转换单元10的数量大于设于第二区域304的光转换单元10的数量。在本公开其它实施方式中，如图9所示，设于第一区域303的光转换单元10的尺寸大于设于第二 区域304的光转换单元10的尺寸，也就是说，设于第一区域303的光转换单元10所含的光转换材料的质量大于设于第二区域304的光转换单元10所含的光转换材料的质量。以中框3包括相互连接的第一框段301和第二框段302为例，该第一区域303可以位于第二框段302的内壁，该第二区域304可以位于第一框段301的内壁。其中，由于第二框段302的内壁直径大于第一框段301的内壁直径，导致发光基板2出射至第二框段302处的光强度小于发光基板2出射至第一框段301处的光强度。此外，该中框3内壁还可以设有反射片，该光转换单元10设于反射片上。
本公开实施方式还提供一种显示装置。该显示装置可以包括上述任一实施方式所述的背光模组。当然，如图1、图2以及图5所示，该显示装置还可以包括显示面板8。由于本公开实施方式的显示装置所包括的背光模组同上述背光模组的实施方式中的背光模组相同，因此，其具有相同的有益效果，本公开在此不再赘述。
以上所述仅是本公开的较佳实施方式而已，并非对本公开做任何形式上的限制，虽然本公开已以较佳实施方式揭露如上，然而并非用以限定本公开，任何熟悉本专业的技术人员，在不脱离本公开技术方案的范围内，当可利用上述揭示的技术内容做出些许更动或修饰为等同变化的等效实施方式，但凡是未脱离本公开技术方案的内容，依据本公开的技术实质对以上实施方式所作的任何简单修改、等同变化与修饰，均仍属于本公开技术方案的范围内。

Claims (18)

  1. 一种背光模组，其特征在于，包括：
    背板；
    中框，设于所述背板上；
    发光基板，设于所述背板上，且位于所述中框内，所述发光基板包括第一发光区以及围绕所述第一发光区的第二发光区，所述第二发光区靠近所述发光基板的边缘；
    光补偿结构，靠近所述发光基板的边缘，所述光补偿结构包括光转换材料。
  2. 根据权利要求1所述的背光模组，其特征在于，所述发光基板背向所述背板的表面设有保护层，所述保护层对应于所述第二发光区的区域掺杂光转换颗粒，所述保护层掺杂有所述光转换颗粒的区域构成所述光补偿结构。
  3. 根据权利要求2所述的背光模组，其特征在于，所述发光基板的出光色为蓝色，所述光转换颗粒为黄色光转换材料。
  4. 根据权利要求2所述的背光模组，其特征在于，所述发光基板的出光色为蓝色，所述光转换颗粒包括红色光转换材料和绿色光转换材料。
  5. 根据权利要求3或4所述的背光模组，其特征在于，所述第一发光区出射的光通过所述保护层对应于所述第一发光区的区域后为蓝光，所述背光模组还包括设于所述发光基板远离所述背板的一侧的色转换层，所述色转换层包括红色光转换材料和绿色光转换材料或者所述色转换层包括黄色光转换材料。
  6. 根据权利要求4所述的背光模组，其特征在于，所述背光模组还包括设于所述发光基板远离所述背板的一侧的色转换层，所述色转换层为绿色量子点层，所述保护层对应于所述第一发光区的区域掺杂红色光转换材料。
  7. 根据权利要求2所述的背光模组，其特征在于，所述保护层为封装胶。
  8. 根据权利要求2所述的背光模组，其特征在于，所述发光基板包括：
    衬底，设于所述背板上；
    多个发光单元，设于所述衬底背向所述背板的表面；
    所述保护层包括多个保护单元，一个所述保护单元覆盖一个所述发光单元的出光面，且与所述发光单元的出光面直接接触，所述保护单元背向所述发光单元的表面为曲面。
  9. 根据权利要求2所述的背光模组，其特征在于，沿着所述保护层的边缘靠近所述保护层的内部的方向，所述光转换颗粒的掺杂浓度逐渐变小。
  10. 根据权利要求1所述的背光模组，其特征在于，所述光补偿结构设于所述中框的内壁。
  11. 根据权利要求10所述的背光模组，其特征在于，所述光补偿结构包括：
    多个光转换单元，均设于所述中框的内壁。
  12. 根据权利要求11所述的背光模组，其特征在于，设有所述光转换单元的所述中框内壁包括面积相同的第一区域和第二区域，所述第一区域位于所述第二区域远离所述发光基板的一侧，设于所述第一区域的所述光转换单元的密度大于设于所述第二区域的光转换单元的密度。
  13. 根据权利要求11所述的背光模组，其特征在于，设有所述光转换单元的所述中框内壁包括第一区域和第二区域，所述第一区域位于所述第二区域远离所述发光基板的一侧，设于所述第一区域的所述光转换单元的尺寸大于设于所述第二区域的光转换单元的尺寸。
  14. 根据权利要求12或13所述的背光模组，其特征在于，所述中框包括相互连接的第一框段和第二框段，所述第一框段设于所述背板上，所述第二框段设于所述第一框段远离所述背板的一侧，沿着远离所述第一框段的方向所述第二框段的内径逐渐变大，所述第一区域位于所述第二框段的内壁，所述第二区域位于所述第一框段的内壁。
  15. 根据权利要求11所述的背光模组，其特征在于，所述中框内壁设有反射片，所述光转换单元设于所述反射片上。
  16. 根据权利要求11所述的背光模组，其特征在于，所述发光基板的出光色为蓝色，所述光转换单元为黄色光转换单元。
  17. 根据权利要求1所述的背光模组，其特征在于，所述光转换材料包括荧光材料或量子点材料。
  18. 一种显示装置，其特征在于，包括权利要求1-17任一项所述的背光模组。
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