WO2022104554A1 - 一种背光模组及显示装置 - Google Patents

一种背光模组及显示装置 Download PDF

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Publication number
WO2022104554A1
WO2022104554A1 PCT/CN2020/129498 CN2020129498W WO2022104554A1 WO 2022104554 A1 WO2022104554 A1 WO 2022104554A1 CN 2020129498 W CN2020129498 W CN 2020129498W WO 2022104554 A1 WO2022104554 A1 WO 2022104554A1
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WO
WIPO (PCT)
Prior art keywords
light
backlight module
guide plate
light guide
film
Prior art date
Application number
PCT/CN2020/129498
Other languages
English (en)
French (fr)
Inventor
林敬飞
Original Assignee
京东方科技集团股份有限公司
高创(苏州)电子有限公司
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, 高创(苏州)电子有限公司 filed Critical 京东方科技集团股份有限公司
Priority to CN202080002812.3A priority Critical patent/CN114830021A/zh
Priority to PCT/CN2020/129498 priority patent/WO2022104554A1/zh
Priority to US18/036,861 priority patent/US12038647B2/en
Publication of WO2022104554A1 publication Critical patent/WO2022104554A1/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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/003—Light absorbing elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/206—Filters comprising particles embedded in a solid matrix
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • 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
    • G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
    • G02B2207/101—Nanooptics
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • the present disclosure relates to a reflective film, in particular to a backlight module and a display device.
  • LCD Liquid Crystal Display
  • An LCD display is a passive light-emitting display, and the display itself does not emit light, but is illuminated by a backlight module behind the display.
  • the light guide plate comprises: a bottom surface and a light exit surface arranged oppositely, and a light incident surface connecting the bottom surface and the light exit surface;
  • the edge-type light source is located on one side of the light incident surface of the light guide plate;
  • a quantum dot film located on the light-emitting surface of the light guide plate
  • a reflective film located on the bottom side of the light guide plate, the reflective film includes a body and a yellow film around the body, the yellow film is configured to absorb the refracted light from the light guide plate to the surrounding of the reflective film Blu-ray.
  • the yellow film includes a plurality of yellow color blocks printed around the body.
  • the total area of the yellow color blocks accounts for 5%-80% of the area of the body.
  • the total area of the yellow color blocks per unit area shows a decreasing trend.
  • the edge area of the reflective film points to the central area of the reflective film
  • the distribution density of the yellow color blocks is the same
  • the diameter of the yellow color blocks is the same. showing a decreasing trend.
  • the diameter of the yellow color block is 0.2 mm-3 mm.
  • the wavelength of light reflected by the yellow film is 577 nm-597 nm.
  • the yellow film includes: a first area adjacent to the edge-type light source, a second area disposed opposite to the edge-type light source, and Connect the first area, the third area and the fourth area of the second area; wherein, the width of the first area is 0-50mm, the width of the second area is 0-30mm, and the third area is The width of the area and the fourth area are both 0-20 mm.
  • the backlight module further comprises: a back plate located on the side of the reflective film facing away from the light guide plate, and a back plate located on the side of the quantum dot film facing away from the light guide plate. side optical film.
  • the light-emitting surface of the side-type light source is parallel to the light-incident surface of the light guide plate, and the side-type light source is a blue LED light bar.
  • an embodiment of the present disclosure further provides a display device, comprising: the above-mentioned backlight module, and a liquid crystal display panel located on a light-emitting surface of the backlight module.
  • the display device further includes a support frame arranged around the liquid crystal display panel and used for fixing the liquid crystal display panel and the backlight module, the liquid crystal display panel.
  • the panel and the backlight module are embedded in the support frame.
  • FIG. 1 is a schematic structural diagram of a backlight module provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic top-view structure diagram of a reflective film provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic top-view structural diagram of a reflective film and an edge-type light source according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural diagram of another backlight module provided by an embodiment of the present disclosure.
  • FIG. 5 is a schematic structural diagram of still another display device according to an embodiment of the present disclosure.
  • the quantum dot backlight module is to add a quantum dot film to the ordinary backlight module.
  • the common edge-type quantum dot backlight module is composed of a reflective film, an edge-type light source, a light guide plate, a quantum dot film and an optical film.
  • the side-type light source of the embedded quantum dot backlight module emits blue light, which is guided by the light guide plate into a surface light source. The blue light excites the quantum dots in the quantum film and converts it into white light.
  • the side-type light source is adjacent to the light incident surface of the light guide plate, the light incident surface of the light guide plate has strong blue light, and except for the light incident surface, the bottom surface and the light exit surface of the light guide plate, the other three sides are generally affixed with reflective strips to guide the light guide plate.
  • the blue light refracted by the light plate is reflected back to the light guide plate, so the blue light on the three sides is also stronger, resulting in a large amount of light emitted from the four sides of the light guide plate, and the quantum dots in the quantum dot film are evenly distributed, so there is some blue light on the edges of the four sides. All of them are excited by quantum dots into white light, and this part of the blue light penetrates out, causing the four sides of the liquid crystal display to appear blue.
  • an embodiment of the present disclosure provides a backlight module, as shown in FIG. 1 , including:
  • the light guide plate 1, the light guide plate 1 includes: a bottom surface 11 and a light exit surface 12 arranged oppositely, and a light incident surface 13 connecting the bottom surface 11 and the light exit surface 12;
  • the side-type light source 2, the side-type light source 2 is located on the side of the light incident surface 13 of the light guide plate 1;
  • the quantum dot film 3 is located on the light-emitting surface 12 of the light guide plate 1;
  • the reflective film 4 is located on the side of the bottom surface 11 of the light guide plate 1. As shown in FIG. 2, the reflective film 4 includes a main body 41 and a yellow film 42 located around the main body 41. The yellow film 42 is configured to absorb refraction from the light guide plate 1 to reflect Blue light around film 4.
  • the edge-type light source 2 emits blue light and enters the light guide plate 1, wherein a part of the blue light entering the light guide plate 1 is emitted from the light-emitting surface of the light guide plate 1, and is used to interact with the quantum dot film 3 in the backlight module.
  • the quantum dots are excited into white light; a part of the blue light entering the light guide plate 1 will be refracted to the reflective film 4 through the light guide plate 1, and a part of this part of the blue light will be reflected by the yellow film 42 around the body 41 at the edge position of the reflective film 4.
  • the blue light at the surrounding edges of the film 1 is absorbed, thereby reducing the light output from the four sides of the light guide plate 1, so as to prevent the surrounding display from being bluish and to make the color uniform.
  • the reflective film 4 in the backlight module provided by the embodiment of the present disclosure solves the problem that the edges of the four sides of the liquid crystal display are blue due to the large amount of light emitted from the four sides of the side-illuminated backlight module, and the reflective film 4 has a simple structure and is easy to process. It is convenient and low cost, which improves the competitiveness of the product and the taste of the display screen.
  • the material of the yellow film is ink of yellow pigment.
  • the ink of yellow pigment is prepared from yellow pigment and white ink, wherein the yellow pigment itself does not emit light, but the yellow pigment can absorb blue light.
  • the prepared ink with suitable yellow shade is obtained, and the corresponding yellow film is obtained by printing.
  • the wavelength of light reflected by the yellow film is yellow light having a wavelength of 577 nm-597 nm.
  • the mass of the yellow pigment accounts for 5%-20% of the total mass of the ink of the yellow pigment.
  • the total mass of the ink of the yellow pigment is the sum of the mass of the yellow pigment and the mass of the above-mentioned white ink. The inventor of this case has found that if the mass of the yellow pigment accounts for less than 5% of the total mass of the ink of the yellow pigment, the backlight module four The excess blue light on the side is not completely absorbed.
  • the mass of the yellow pigment accounts for more than 20% of the total mass of the ink of the yellow pigment, not only the excess blue light on the four sides of the backlight module is absorbed, but also the yellow film layer may excite the quantum dots on the four sides.
  • the blue light also absorbs a part, which affects the display effect, so the inventor of this case set the mass of the yellow pigment to 5%-20% of the total mass of the ink of the yellow pigment.
  • the yellow film 42 includes a plurality of yellow color blocks 01 printed on the surrounding edges of the main body 41 .
  • the yellow color patch 01 is formed by printing the ink of the yellow pigment prepared above to the surrounding edges of the main body 41 of the reflective film 4 .
  • the yellow color block 01 is printed on the reflective film 4 , the operation is simple and the cost is low.
  • the shape of the yellow color block 01 can be a circle, and of course can also be other shapes.
  • the total area of the yellow color block 01 accounts for 5%-80% of the area of the main body 41 .
  • the yellow color block 01 with a larger area can be selected.
  • the yellow color block 01 with a smaller area can be selected. Therefore, it can be selected according to the excess blue light intensity around the reflective film 4.
  • the area of the yellow color block 01 is not limited here.
  • the side-illuminated light source 2 is adjacent to the light incident surface 13 of the light guide plate 1 , the light incident surface 13 of the light guide plate 1 has strong blue light, and the light incident surface 13 of the light guide plate 1 is removed.
  • the remaining three surfaces except the bottom surface 11 and the light-emitting surface 12 are generally affixed with reflective strips, so the blue light of these three surfaces is also stronger; In the central area, the intensity of blue light has a weakening trend. From the remaining three sides except the light incident surface 13, the bottom surface 11 and the light exit surface 12 to the central area of the light guide plate 1, the blue light intensity also has a weakening trend, so that it is refracted from around the light guide plate 1.
  • the blue light on the reflective film 4 points from the edge of the reflective film 4 to the central area, and the blue light on the reflective film 4 also has a weakening trend. Therefore, from the edge of the reflective film 4 to the central area, the excess blue light also shows a weakening trend. Therefore, in the above-mentioned reflective film provided by the embodiment of the present disclosure, as shown in FIG. 2 , along the edge region of the reflective film 4 to the central region of the reflective film 4 (the arrow points to), the total area of the yellow color block 01 in the unit area shows a decreasing trend . In this way, the excess blue light around it can be effectively absorbed without absorbing the blue light used to excite the quantum dots, which further improves the display effect.
  • the diameter of the yellow color block 01 shows a decreasing trend along the edge region of the reflective film 4 to the central region of the reflective film 4 (the arrow points to) .
  • the distribution density of the yellow color blocks 01 may be the same, but the diameter of the yellow color blocks 01 shows a decreasing trend; it may also be the yellow color blocks 01
  • the distribution density of 01 and the diameter of the yellow color block 01 show a decreasing trend; design according to actual needs.
  • the total area of the yellow color blocks in the above-mentioned unit area shows a decreasing trend, and it can also be directed from the edge area of the reflective film to the central area of the reflective film.
  • All the yellow color blocks have the same size, but the density of the yellow color blocks is distributed.
  • a decreasing trend; or both the size of the yellow patch and the density of the yellow patch distribution show a decreasing trend.
  • the density of the distribution of the yellow color blocks is the same, and the size of the yellow color blocks shows a decreasing trend for illustration as an example.
  • the diameter of the yellow color block 01 may be 0.2 mm-3 mm. Specifically, a larger diameter can be selected for the yellow color blocks 01 near the edge region of the reflective film, and a smaller diameter can be selected for the yellow color blocks 01 near the central region of the reflective film.
  • the light incident surface 13 of the light guide plate 1 since the light incident surface 13 of the light guide plate 1 is directly adjacent to the edge light source 2 , the light incident surface 13 of the light guide plate 1 has the strongest blue light. 1. The blue light on the opposite surface of the light incident surface 13 is also stronger, and the blue light intensity corresponding to the remaining two surfaces of the light guide plate 1 except the light incident surface 13, the bottom surface 11, the light exit surface 12 and the opposite surface of the light incident surface 13 is relatively high. Therefore, in the above-mentioned backlight module provided by the embodiment of the present disclosure, as shown in FIG.
  • the yellow film 42 includes: adjacent to the middle side of the backlight module The first area 421 of the incident light source 2, the second area 422 disposed opposite to the edge light source 2 in the backlight module, and the third area 423 and the fourth area 424 connecting the first area 421 and the second area 422;
  • the width of the first area 121 is 0-50mm
  • the width of the second area 422 is 0-30mm
  • the width of the third area 423 and the fourth area 424 are both 0-20mm. In this way, the yellow film 42 can absorb the excess blue light around it more effectively.
  • FIG. 4 is only a schematic diagram of a partial cross-sectional structure of the backlight module.
  • the specific structure of each component is the same as that of the prior art, and the difference from the prior art is that the aforementioned yellow film is provided on the reflective film 4; the optical film 6 may include structures such as prism sheets, brightening sheets, and the like.
  • the light-emitting surface 21 of the side-type light source 2 is parallel to the light-incident surface 13 of the light guide plate 1, and the side-type light source 2 may be Blue LED strip light.
  • the LED light bar may include a light bar substrate and a plurality of blue LED lamp beads disposed on the light bar substrate and arranged at intervals. A plurality of blue LED lamp beads are arranged at intervals along the extending direction of the light bar substrate.
  • an embodiment of the present disclosure further provides a display device, as shown in FIG. 5 , including the above-mentioned backlight module, and a liquid crystal display panel 7 located on the light-emitting surface of the backlight module.
  • the display device further includes a support frame arranged around the liquid crystal display panel and used for fixing the liquid crystal display panel and the backlight module, the liquid crystal display panel and the backlight module are embedded in the within the support frame.
  • the material of the support frame may be plastic or metal (eg, stainless steel).
  • the above-mentioned display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, etc.
  • a display function such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, a smart watch, a fitness wristband, a personal digital assistant, etc.
  • Other essential components of the display device should be understood by those of ordinary skill in the art, and will not be described in detail here, nor should it be regarded as a limitation of the present invention.
  • the implementation of the display device may refer to the above-mentioned embodiment of the display panel, and the repetition will not be repeated.
  • the edge-type light source emits blue light and enters the light guide plate, and a part of the blue light enters the light guide plate and is refracted to the light emitting surface of the light guide plate. , showing a white light phenomenon; part of the blue light is refracted to the reflective film by the light guide plate, and the blue light at the edge of the reflective film in this part of the blue light is absorbed by the yellow film around the main body. The amount of light emitted from the edges of the four sides achieves the purpose of displaying a uniform color of the screen.
  • the reflective film in the backlight module solves the problem that the edge of the liquid crystal display is blue due to the large amount of light emitted from the four sides of the side-illuminated backlight module, and the reflective film has a simple structure, convenient processing, The cost is low, which improves the competitiveness of the product and the taste of the display screen.

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

Abstract

本公开实施例公开了一种背光模组及显示装置，背光模组包括：导光板，导光板包括：相对设置的底面和出光面，连接底面和出光面的入光面；侧入式光源，侧入式光源位于导光板的入光面一侧；量子点膜，位于导光板的出光面；反射膜，位于导光板的底面一侧，反射膜包括本体以及位于本体四周的黄色膜，黄色膜被配置为吸收从导光板折射至反射膜四周的蓝光。

Description

一种背光模组及显示装置 技术领域
本公开涉及一种反射膜，特别涉及一种背光模组及显示装置。
背景技术
液晶显示器(Liquid Crystal Display，LCD)具有机身薄、省电、无辐射等众多优点，被广泛的应用于电视、电脑、手机等电子产品中。LCD显示器是一种被动发光显示器，其显示屏本身并不能发光，而是由显示屏背后的背光模组照亮的。
随着人们消费观念的转变，消费者对于液晶显示器的造型更追求轻薄、美观。传统的背光模组根据发光方式不同分为直下式和侧光式两种。侧光式模组相比直下式更加轻薄时尚，符合现代人的时尚追求。
发明内容
本公开实施例提供的一种背光模组，包括：
导光板，所述导光板包括：相对设置的底面和出光面，连接所述底面和所述出光面的入光面；
侧入式光源，所述侧入式光源位于所述导光板的入光面一侧；
量子点膜，位于所述导光板的出光面；
反射膜，位于所述导光板的底面一侧，所述反射膜包括本体以及位于所述本体四周的黄色膜，所述黄色膜被配置为吸收从所述导光板折射至所述反射膜四周的蓝光。
可选地，在本公开实施例提供的上述背光模组中，所述黄色膜包括印刷在所述本体四周的多个黄色色块。
可选地，在本公开实施例提供的上述背光模组中，所述黄色色块的总面积占所述本体面积的5％-80％。
可选地，在本公开实施例提供的上述背光模组中，沿所述反射膜边缘区域指向所述反射膜的中心区域，单位面积内所述黄色色块的总面积呈递减趋势。
可选地，在本公开实施例提供的上述背光模组中，沿所述反射膜边缘区域指向所述反射膜的中心区域，所述黄色色块的分布密度相同，所述黄色色块的直径呈递减趋势。
可选地，在本公开实施例提供的上述背光模组中，所述黄色色块的直径为0.2mm-3mm。
可选地，在本公开实施例提供的上述背光模组中，所述黄色膜反射的光波长为577nm-597nm。
可选地，在本公开实施例提供的上述背光模组中，所述黄色膜包括：邻近所述侧入式光源的第一区域，与所述侧入式光源相对设置的第二区域，以及连接所述第一区域、所述第二区域的第三区域和第四区域；其中，所述第一区域的宽度为0-50mm，所述第二区域宽度为0-30mm，所述第三区域和所述第四区域的宽度均为0-20mm。
可选地，在本公开实施例提供的上述背光模组中，还包括：位于所述反射膜背离所述导光板一侧的背板，以及位于所述量子点膜背离所述导光板的一侧的光学膜片。
可选地，在本公开实施例提供的上述背光模组中，所述侧入式光源的出光面平行于所述导光板的入光面，所述侧入式光源为蓝光LED灯条。
相应地，本公开实施例还提供了一种显示装置，包括：上述背光模组，以及位于所述背光模组出光面的液晶显示面板。
可选地，在本公开实施例提供的上述显示装置中，还包括围绕所述液晶显示面板四周设置、且用于固定所述液晶显示面板和所述背光模组的支撑框架，所述液晶显示面板和所述背光模组内嵌于所述支撑框架内。
附图说明
图1为本公开实施例提供的一种背光模组的结构示意图；
图2为本公开实施例提供的一种反射膜的俯视结构示意图；
图3为本公开实施例提供的一种反射膜和侧入式光源的俯视结构示意图；
图4为本公开实施例提供的又一种背光模组的结构示意图；
图5为本公开实施例提供的又一种显示装置的结构示意图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。并且在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互组合。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“内”、“外”、“上”、“下”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
需要注意的是，附图中各图形的尺寸和形状不反映真实比例，目的只是示意说明本公开内容。并且自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。
量子点背光模组是在普通的背光模组添加量子点膜，目前常见的侧入式量子点背光模组由反射膜、侧入式光源、导光板、量子点膜和光学膜片组成， 侧入式量子点背光模组的侧入式光源发出蓝光，经导光板引导成面光源，蓝光激发量子膜中的量子点，转化为白光。由于侧入式光源邻近导光板的入光面，因此导光板的入光面蓝光较强，并且导光板中除入光面、底面和出光面，其余三面一般都贴有反射条以将从导光板折射的蓝光反射回导光板，因此该三面的蓝光也较强，从而导致导光板四侧边缘出光量偏大，而量子点膜中的量子点呈均匀分布，所以四侧边缘存在部分蓝光未全部与量子点激发成白光，此部分蓝光穿透而出后导致液晶显示屏四侧边缘呈现发蓝现象。
为了解决侧入式背光模组由于四侧出光量较大导致液晶显示屏四侧边缘发蓝的问题，本公开实施例提供了一种背光模组，如图1所示，包括：
导光板1，导光板1包括：相对设置的底面11和出光面12，连接底面11和出光面12的入光面13；
侧入式光源2，侧入式光源2位于导光板1的入光面13一侧；
量子点膜3，位于导光板1的出光面12；
反射膜4，位于导光板1的底面11一侧，如图2所示，反射膜4包括本体41以及位于本体41四周的黄色膜42，黄色膜42被配置为吸收从导光板1折射至反射膜4四周的蓝光。
本公开实施例提供的上述背光模组，侧入式光源2发出蓝光进入导光板1，其中进入导光板1一部分蓝光从导光板1的出光面射出，用于与背光模组中量子点膜3的量子点激发成白光；进入导光板1的一部分蓝光会经导光板1折射至反射膜4上，此部分蓝光中的一部分在反射膜4四周边缘位置通过利用本体41四周的黄色膜42将反射膜1四周边缘位置的蓝光吸收，从而降低导光板1四侧边缘的出光量，达到避免四周显示画面偏蓝从而使颜色均匀的目的。本公开实施例提供的背光模组中的反射膜4解决了侧入式背光模组由于四侧出光量较大导致液晶显示屏四侧边缘发蓝的问题，并且反射膜4的结构简单、加工方便、成本低，提升了产品的竞争性和显示画面品味。
可选地，在本公开实施例提供的上述背光模组中，黄色膜的材料为黄色颜料的油墨。具体地，黄色颜料的油墨由黄色颜料和白色油墨调制得到，其 中黄色颜料本身不发光，但是黄色颜料能够吸收蓝光。通过黄色颜料和白色油墨调制，得到黄色深浅合适的调制油墨，通过印刷得到相应的黄色膜。
可选地，在本公开实施例提供的上述背光模组中，黄色膜反射的光波长为577nm-597nm的黄光。
可选地，在本公开实施例提供的上述背光模组中，黄色颜料的质量占黄色颜料的油墨总质量的5％-20％。具体地，黄色颜料的油墨总质量为黄色颜料的质量和上述白色油墨的质量之和，本案的发明人发现，若黄色颜料的质量占黄色颜料的油墨总质量小于5％，则背光模组四侧多余的蓝光没有被吸收完全，若黄色颜料的质量占黄色颜料的油墨总质量大于20％，则不仅背光模组四侧多余的蓝光被吸收，黄色膜层还可能将四侧激发量子点的蓝光也吸收一部分，影响显示效果，因此本案的发明人将黄色颜料的质量占黄色颜料的油墨总质量设置为5％-20％。
可选地，在本公开实施例提供的上述背光模组中，如图2所示，黄色膜42包括印刷在本体41四周边缘的多个黄色色块01。黄色色块01由上述调制的黄色颜料的油墨通过印刷方式形成到反射膜4的本体41四周边缘。黄色色块01通过印刷到反射膜4上，操作简单，成本较低。
具体地，如图2所示，黄色色块01的形状可以为圆形，当然也可以为其它形状。
可选地，在本公开实施例提供的上述背光模组中，如图2所示，黄色色块01的总面积占本体41面积的5％-80％，当反射膜4四周多余的蓝光较强时，可以选择较大面积的黄色色块01，当反射膜4四周多余的蓝光较弱时，可以选择较小面积的黄色色块01，因此可以根据反射膜4四周多余的蓝光强度进行选择黄色色块01的面积，在此不做限定。
在具体实施时，如图1所示，由于侧入式光源2邻近导光板1的入光面13，因此导光板1的入光面13蓝光较强，并且导光板1中除入光面13、底面11和出光面12之外的其余三面一般都贴有反射条，因此该三面的蓝光也较强；由于光线是直线传播的，因此从导光板1的入光面13至导光板1的中心区域， 蓝光的强度有减弱趋势，从除入光面13、底面11和出光面12之外的其余三面至导光板1的中心区域，蓝光强度也是具有减弱趋势，从而从导光板1四周折射至反射膜4上的蓝光，从反射膜4边缘指向中心区域，反射膜4上的蓝光也是具有减弱趋势，因此从反射膜4边缘指向中心区域，多余的蓝光也是呈减弱趋势。因此在本公开实施例提供的上述反射膜中，如图2所示，沿反射膜4边缘区域指向反射膜4的中心区域(箭头指向)，单位面积内黄色色块01的总面积呈递减趋势。这样可以将四周多余的蓝光有效吸收，而不会将用于激发量子点的蓝光吸收，进一步提高显示效果。
可选地，在本公开实施例提供的上述背光模组中，如图2所示，沿反射膜4边缘区域指向反射膜4的中心区域(箭头指向)，黄色色块01的直径呈递减趋势。具体地，沿反射膜4边缘区域指向反射膜4的中心区域(箭头指向)，可以是黄色色块01的分布密度相同，但是黄色色块01的直径呈递减趋势；也可以是黄色色块01的分布密度和黄色色块01的直径均呈递减趋势；根据实际需要进行设计。
当然，上述所说的单位面积内黄色色块的总面积呈递减趋势，也可以是沿反射膜边缘区域指向反射膜的中心区域，所有黄色色块的尺寸相同，但是黄色色块分布的密度呈递减趋势；或者黄色色块的尺寸和黄色色块分布的密度均呈递减趋势。本公开实施例的图2中是以黄色色块分布的密度相同，黄色色块的尺寸呈递减趋势为例进行说明的。
可选地，在本公开实施例提供的上述反射膜中，如图2所示，黄色色块01的直径可以为0.2mm-3mm。具体地，靠近反射膜边缘区域的黄色色块01可以选择较大的直径，靠近反射膜中心区域的黄色色块01可以选择较小的直径。
在具体实施时，如图1所示，由于导光板1的入光面13直接与侧入式光源2邻近，因此导光板1的入光面13蓝光最强，由于光线直线传播，因此导光板1入光面13的相对面的蓝光也较强，而导光板1中除入光面13、底面11和出光面12以及入光面13的相对面之外的其余两面对应的蓝光强度相对 较弱；因此在本公开实施例提供的上述背光模组中，如图3所示，图3为反射膜4和侧入式光源2的俯视示意图，该黄色膜42包括：邻近背光模组中侧入式光源2的第一区域421，与背光模组中侧入式光源2相对设置的第二区域422，以及连接第一区域421、第二区域422的第三区域423和第四区域424；沿黄色膜42的边缘区域指向中心区域，第一区域121的宽度为0-50mm，第二区域422宽度为0-30mm，第三区域423和第四区域424的宽度均为0-20mm。这样黄色膜42可以更加有效的吸收四周多余的蓝光。
可选地，在本公开实施例提供的上述背光模组中，如图4所示，还包括：位于反射膜4背离导光板1一侧的背板5，以及位于量子点膜3背离导光板1的一侧的光学膜片6。具体地，图4仅是背光模组的部分剖面结构示意图，各部件的具体结构与现有技术相同，与现有技术的区别在于反射膜4上设置了前述所述的黄色膜；光学膜片6可以包括棱镜片、增亮片等结构。
可选地，在本公开实施例提供的上述背光模组中，如图4所示，侧入式光源2的出光面21平行于导光板1的入光面13，侧入式光源2可以为蓝光LED灯条。
具体地，LED灯条可以包括灯条基板以及设于灯条基板上并且间隔设置的多个蓝光LED灯珠。多个蓝光LED灯珠沿灯条基板的延伸方向依次间隔排列。
基于同一发明构思，本公开实施例还提供了一种显示装置，如图5所示，包括上述背光模组，以及位于背光模组出光面的液晶显示面板7。
可选地，在本公开实施例提供的上述显示装置中，还包括围绕液晶显示面板四周设置、且用于固定液晶显示面板和背光模组的支撑框架，液晶显示面板和背光模组内嵌于支撑框架内。
具体地，支撑框架的材质可以为塑料或者金属(例如不锈钢)。
具体地，上述显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪、智能手表、健身腕带、个人数字助理等任何具有显示功能的产品或部件。对于显示装置的其它必不可少的组成部分均为 本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本发明的限制。另外，由于该显示装置解决问题的原理与上述显示面板解决问题的原理相似，因此，该显示装置的实施可以参见上述显示面板的实施例，重复之处不再赘述。
本公开实施例提供的上述背光模组及显示装置，侧入式光源发出蓝光进入导光板，一部分蓝光进入导光板折射至导光板的出光面，经过与背光模组中量子点膜的量子点激发，呈现白光现象；一部分蓝光经导光板折射至反射膜上，此部分蓝光中在反射膜四周边缘位置的蓝光，通过利用本体四周的黄色膜将反射膜四周边缘位置的蓝光吸收，从而降低导光板四侧边缘的出光量，达到显示画面颜色均匀的目的。本公开实施例提供的背光模组中的反射膜解决了侧入式背光模组由于四侧出光量较大导致液晶显示屏四侧边缘发蓝的问题，并且反射膜的结构简单、加工方便、成本低，提升了产品的竞争性和显示画面品味。
尽管已描述了本公开的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本公开范围的所有变更和修改。
显然，本领域的技术人员可以对本公开实施例进行各种改动和变型而不脱离本公开实施例的精神和范围。这样，倘若本公开实施例的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (12)

  1. 一种背光模组，其中，包括：
    导光板，所述导光板包括：相对设置的底面和出光面，连接所述底面和所述出光面的入光面；
    侧入式光源，所述侧入式光源位于所述导光板的入光面一侧；
    量子点膜，位于所述导光板的出光面；
    反射膜，位于所述导光板的底面一侧，所述反射膜包括本体以及位于所述本体四周的黄色膜，所述黄色膜被配置为吸收从所述导光板折射至所述反射膜四周的蓝光。
  2. 如权利要求1所述的背光模组，其中，所述黄色膜包括印刷在所述本体四周的多个黄色色块。
  3. 如权利要求2所述的背光模组，其中，所述黄色色块的总面积占所述本体面积的5％-80％。
  4. 如权利要求3所述的背光模组，其中，沿所述反射膜边缘区域指向所述反射膜的中心区域，单位面积内所述黄色色块的总面积呈递减趋势。
  5. 如权利要求4所述的背光模组，其中，沿所述反射膜边缘区域指向所述反射膜的中心区域，所述黄色色块的分布密度相同，所述黄色色块的直径呈递减趋势。
  6. 如权利要求5所述的背光模组，其中，所述黄色色块的直径为0.2mm-3mm。
  7. 如权利要求1所述的背光模组，其中，所述黄色膜反射的光波长为577nm-597nm。
  8. 如权利要求1所述的背光模组，其中，所述黄色膜包括：邻近所述侧入式光源的第一区域，与所述侧入式光源相对设置的第二区域，以及连接所述第一区域、所述第二区域的第三区域和第四区域；其中，所述第一区域的宽度为0-50mm，所述第二区域宽度为0-30mm，所述第三区域和所述第四区 域的宽度均为0-20mm。
  9. 如权利要求1所述的背光模组，其中，还包括：位于所述反射膜背离所述导光板一侧的背板，以及位于所述量子点膜背离所述导光板的一侧的光学膜片。
  10. 如权利要求1所述的背光模组，其中，所述侧入式光源的出光面平行于所述导光板的入光面，所述侧入式光源为蓝光LED灯条。
  11. 一种显示装置，其中，包括：如权利要求1-10任一项所述的背光模组，以及位于所述背光模组出光面的液晶显示面板。
  12. 如权利要求11所述的显示装置，其中，还包括围绕所述液晶显示面板四周边缘设置、且用于固定所述液晶显示面板和所述背光模组的支撑框架，所述液晶显示面板和所述背光模组内嵌于所述支撑框架内。
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