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WO2018223807A1 - Module de rétro-éclairage et dispositif d'affichage - Google Patents

Module de rétro-éclairage et dispositif d'affichage Download PDF

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Publication number
WO2018223807A1
WO2018223807A1 PCT/CN2018/086532 CN2018086532W WO2018223807A1 WO 2018223807 A1 WO2018223807 A1 WO 2018223807A1 CN 2018086532 W CN2018086532 W CN 2018086532W WO 2018223807 A1 WO2018223807 A1 WO 2018223807A1
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WO
WIPO (PCT)
Prior art keywords
backlight
backlight module
light guide
optical structure
guide plate
Prior art date
Application number
PCT/CN2018/086532
Other languages
English (en)
Chinese (zh)
Inventor
张晓初
Original Assignee
京东方科技集团股份有限公司
合肥京东方显示光源有限公司
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, 合肥京东方显示光源有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2018223807A1 publication Critical patent/WO2018223807A1/fr

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Classifications

    • 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
    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide

Definitions

  • Embodiments of the present invention relate to a backlight module and a display device.
  • liquid crystal display devices have been widely used in electronic products such as smart phones, tablet computers, notebooks, displays, televisions and the like.
  • liquid crystal panel itself does not have a function of emitting light, it is usually necessary to use a backlight as a light source to realize a display function.
  • backlight As consumers' demands for the quality of products such as televisions or mobile phones continue to increase, the technical requirements for backlight modules continue to increase.
  • the light guide plate is one of the key components of the backlight module. Because the light guide plate melts the plastic raw material during the injection molding process, and is injected into the cavity at a high temperature under high temperature, the plastic raw material is generally polymethyl methacrylate. (polymethyl methacrylate, PMMA) or polycarbonate (Polycarbonate, PC), etc., the plastic raw material is carbonized under strong shear heat, causing physical properties to change, resulting in uneven chromaticity of the light emitted by the formed light guide plate.
  • the backlight module is yellowed.
  • the dots are sprayed or printed on the light guide plate, and the ultraviolet light (UV) is cured on the light guide plate of the sprayed or printed dots, the shadowless glue (UV glue) passes through. Ultraviolet light irradiation also produces a yellowing effect, causing the backlight module to be yellowish.
  • the backlight of the Light Emitting Diode for the side-entry backlight, the light emitted from the LED backlight propagates through the light guide plate, and some light is transmitted from the low beam end to the far end. There will also be some loss in the process until the high beam end of the light guide plate, that is, the farther away the backlight module is from the backlight, the more severe the polarization is, for example, the short-wavelength blue light wavelength portion will be gradually absorbed, and the yellow light will appear in the near-optical end. As the optical path increases, the contrast difference will be more pronounced.
  • the backlight module may also have color casts of other colors, such as reddish color and partial color.
  • the embodiment of the invention provides a backlight module and a display device for alleviating the color cast problem of the backlight module existing in the prior art.
  • An embodiment of the present invention provides a backlight module, including: a light guide plate, a backlight located on a side of the light guide plate, and an optical structure on a side of the light exit surface of the light guide plate; wherein the optical structure is disposed in the optical structure A pigment having a specific color; the content of the pigment in the optical structure is increasing in a direction away from the backlight.
  • the backlight module provided by the embodiment of the present invention further includes: a diffusion sheet located on a side of the light-emitting surface of the light guide plate; the diffusion sheet includes: a substrate, and the substrate is located away from the light guide plate a diffusing film on the side; the optical structure being the substrate or the diffusion film.
  • the optical structure is the substrate; the thickness of the substrate is gradually increased along a direction away from the backlight.
  • the optical structure is the diffusion film; the thickness of the diffusion film is gradually increased along a direction away from the backlight.
  • the diffusion film includes a connection layer and a plurality of diffusion particles distributed inside the connection layer; the pigment of the specific color is distributed in the connection layer.
  • the thickness of the diffusion sheet is uniform along a direction away from the backlight.
  • the optical structure is the substrate, and the thickness of the diffusion film is gradually decreased along a direction away from the backlight; or
  • the optical structure is the diffusion film, and the thickness of the substrate gradually decreases in a direction away from the backlight.
  • the light guide plate has a plurality of dot structures; the density of the dot structures on the light guide plate increases as the thickness of the diffusion layer increases. .
  • the specific color is blue.
  • Another embodiment of the present invention further provides a display device, including: the backlight module described in the above embodiment, and a display panel located in a light emitting direction of the backlight module.
  • a backlight module and a display device include: a light guide plate, a backlight located on a side of the light guide plate, and an optical structure on a side of the light exit surface of the light guide plate; wherein, in the optical structure Pigments of a particular color are provided; the amount of pigment in the optical structure is increasing along the direction away from the backlight.
  • the pigment of a specific color is added to the optical structure on the light-emitting surface side of the light guide plate, and the direction of the backlight module is away from the backlight.
  • the content of the pigment in the optical structure is getting higher and higher, and the light emitted from the backlight passes through the light guide plate, and is mixed with the color of the pigment in the optical structure to white light, thereby alleviating the polarizing phenomenon of the backlight module, and not due to the pigment. New polarization occurs, and the adjustment period is shorter and the cost is lower.
  • FIG. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention.
  • FIG. 2 is a second schematic structural diagram of a backlight module according to an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention.
  • FIG. 4 is a third schematic structural diagram of a backlight module according to an embodiment of the present invention.
  • FIG. 5 is a second schematic structural diagram of a light guide plate according to an embodiment of the present invention.
  • the known technique adjusts the chromatic aberration by adjusting the band control of the blue light chip itself of the LED backlight and the phosphor ratio, and the verification adjustment period is long, and if the blue chip is selected for matching, there will be a very A waste of big costs.
  • the backlight module includes a light guide plate 11 , a backlight 12 on a side of the light guide plate 11 , and a side of the light guide surface of the light guide plate 11 .
  • the optical structure 13 wherein a pigment 14 of a specific color is provided in the optical structure 13; the content of the pigment 14 in the optical structure 13 is higher and higher along the direction away from the backlight 12.
  • the backlight module provided by the embodiment of the present invention adds a pigment 14 of a specific color to the optical structure 13 on the light-emitting surface side of the light guide plate 11 and along the direction away from the backlight 12, the pigment 14 in the optical structure 13
  • the content is higher and higher, and the light emitted from the backlight 12 passes through the light guide plate 11 and is mixed with the color of the pigment 14 in the optical structure 13 to white light, thereby alleviating the polarizing phenomenon of the backlight module, and no new one due to the pigment 14
  • the polarized light has a shorter adjustment period and a lower cost.
  • the side-entry backlight 12 that is, the backlight 12 is located at the side of the light guide plate 11, the light emitted by the backlight 12 is transmitted through the light guide plate 11, and some colors of light may exist during the propagation process.
  • Part of the loss causes the light emitted from the light-emitting surface of the backlight module to be polarized, and the farther away from the backlight 12, the more severe the loss of light, and thus, the polarization of the light-emitting surface of the backlight module in a direction away from the backlight 12 getting more serious.
  • the optical structure 13 by adding a pigment 14 of a specific color to the optical structure 13 on the light-emitting surface side of the light guide plate 11, light rays (non-white light rays) emitted from the light-emitting surface of the light guide plate 11 and the optical structure 13 are
  • the color of the pigment 14 is mixed into white light, so that the polarizing phenomenon of the light emitted from the backlight module can be alleviated, and the content of the pigment 14 in the optical structure 13 is higher and higher along the direction away from the backlight 12, according to
  • the degree of the polarization phenomenon is set to the content of the pigment 14, that is, the content of the pigment 14 is high at a position where the polarization phenomenon is severe, and the content of the pigment 14 is low at a position where the polarization phenomenon is not serious, and thus, the mixed light can be made.
  • the problem that the light emitted from the backlight 12 is discolored during the propagation of the light guide plate 11 is improved, and the picture taste of the backlight module is improved.
  • the solution provided by the embodiment of the present invention can more easily alleviate the backlight mode, compared with the scheme of adjusting the chip of the backlight 12 or adjusting the ratio of the phosphor in the prior art.
  • the polarization phenomenon, an adjustment period is shorter, and low cost.
  • the backlight 12 in the direction away from the backlight 12 can be understood as the side of the backlight 12 capable of emitting light, in a direction away from the backlight, for example, the backlight 12 is located in FIG.
  • the right side of the light guide plate 11 may be substantially leftward in the direction away from the backlight 12, that is, may be a direction indicated by an arrow in the figure, or may be a direction deviating from an angle of an arrow in the figure.
  • the specific color of the pigment 14 in the optical structure 13 needs to be determined according to the polarized color of the backlight module, and the specific color and the polarized color of the backlight module are complementary colors, that is, the specific color and the polarized color of the backlight module.
  • White light can be obtained after mixing.
  • the polarizing color of the backlight module is yellow
  • the specific color is blue
  • the polarizing color of the backlight module is red
  • the specific color is cyan or the like. This is merely an example and does not limit the color of the pigment 14.
  • the optical structure 13 may be any optical structure located on the light-emitting surface of the light guide plate 11. It may be a new optical structure, or may be a conventional structure in the backlight module, such as a diffusion sheet or a brightness enhancement sheet. The implementation of the optical structure is limited.
  • An example of the backlight module provided by the embodiment of the present invention, as shown in FIG. 2 or FIG. 4, may further include: a diffusion sheet 15 on a side of the light-emitting surface of the light guide plate 11; and a diffusion sheet 15 including: a substrate 151, And a diffusion film 152 located on a side of the substrate 151 away from the light guide plate 11; the optical structure is a substrate 151 or a diffusion film 152.
  • the pigment 14 of a specific color that is, the substrate 151 or the diffusion film 152 is added as an optical structure in the substrate 151 or the diffusion film 152 in the diffusion sheet 15, and it is not necessary to provide an optical structure separately.
  • a new optical component is added to the backlight module, and thus the thickness of the backlight module is not increased.
  • the substrate 151 or the diffusion film 152 is used as an optical structure.
  • the structure is as the above optical structure, for example, a substrate 151 or a brightness enhancement film in a light-increasing sheet.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • the optical structure described above is a substrate 151; the thickness of the substrate 151 is gradually increased in a direction away from the backlight 12.
  • a pigment 14 of a specific color may be added to the material of the substrate 151.
  • the material of the substrate 151 may be a transparent material.
  • polyethylene terephthalate may be used.
  • PET Polyethylene terephthalate
  • a pigment 14 of a specific color may be added during the melting of the PET particles, the pigment 14 is uniformly distributed in the PET material by stirring, and then the PET material is extrusion-drawn into a coil for subsequent batch production.
  • the substrate 151 is used.
  • the thickness of the substrate 151 is gradually increased in a direction away from the backlight 12, and the content of the pigment 14 can be relatively easily realized in a direction away from the backlight 12, so that the light guide plate 11 can be made. After the emitted non-white light is mixed with the pigment 14 in the substrate 151, uniform white light can be obtained on the light-emitting surface of the backlight module.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the optical structure described above is a diffusion film 152; the thickness of the diffusion film 152 gradually increases in a direction away from the backlight 12.
  • the pigment 14 of a specific color is uniformly distributed in the material for forming the diffusion film 152, and it is relatively easy to achieve a higher content of the pigment 14 in the direction away from the backlight 12.
  • the thickness of the diffusion film 152 is set to gradually increase in thickness in a direction away from the backlight 12, and the content of the pigment 14 can be relatively easily realized in a direction away from the backlight 12.
  • the diffusion film 152 may include a connection layer 1521 and a plurality of diffusion particles 1522 distributed inside the connection layer 1521; the pigment 14 of a specific color is distributed in the connection layer 1521.
  • the pigment 14 of a specific color may be added to the binder resin material for forming the connection layer 1521, and the binder resin material mixed with the pigment 14 may be coated together with the diffusion particles 1522. On the material 151, the pigment 14 is thus uniformly distributed in the diffusion film 152.
  • the substrate 151 or the diffusion film 152 by setting the substrate 151 or the diffusion film 152 to be wedge-shaped, the content of the pigment 14 is higher and higher along the direction away from the backlight 12, so that the manufacturing process is relatively simple, for example, the substrate can also be used.
  • 151 or the diffusion film 152 is disposed to have the same thickness, and the density of the pigment 14 in the control substrate 151 or the diffusion film 152 is higher and higher along the direction away from the backlight 12, but the manufacturing process is complicated, and the density of the pigment 14 is not easily controlled.
  • the thickness of the diffusion sheet 15 is uniform in the direction away from the backlight 12.
  • the base material 151 of the diffusion sheet 15 also has a certain diffusion effect, in order to ensure the uniformity of the diffusion sheet 15, it is necessary to ensure that the thickness of the diffusion sheet 15 is uniform.
  • the optical structure is the substrate 151, and the thickness of the diffusion film 152 is gradually decreased along the direction away from the backlight 12.
  • the thickness of the diffusion film 152 is gradually decreased, and in order to ensure the uniform thickness of the diffusion sheet 15, the substrate 151 and the diffusion
  • the inclined faces of the film 152 are inclined to the same extent.
  • the optical structure is the diffusion film 152, and the thickness of the substrate 151 is gradually decreased along the direction away from the backlight 12.
  • the thickness of the substrate 151 is gradually reduced, and in order to ensure the uniform thickness of the diffusion sheet 15, the substrate 151 and the diffusion
  • the inclined faces of the film 152 are inclined to the same extent.
  • the substrate 151 and the diffusion layer of the diffusion sheet 15 may be disposed in a wedge shape.
  • the substrate 151 or the diffusion layer may be disposed in other shapes.
  • a prism having a triangular cross section or the like the shape of the substrate 151 and the diffusion layer are not limited herein.
  • the particles of the pigment 14 are indicated by a circle, and the elliptical shape indicates the diffusion particles 1522, and the shape and distribution of the particles of the pigment 14 and the diffusion particles 1522 are not limited for convenience of illustration.
  • the light guide plate 11 has a plurality of dot structures 111; the density of the dot structures 111 on the light guide plate 11 is along with the diffusion layer. The thickness increases as the thickness increases.
  • the diffusion layer in order to realize that the content of the pigment 14 is higher and higher along the direction away from the backlight 12, the diffusion layer is set to a shape with uneven thickness, such as a wedge shape, in order to ensure the light emitted from the light emitting surface of the backlight module.
  • the overall light density is uniform, and the density of the dot-point structure 111 of the light guide plate 11 needs to be adjusted.
  • the density of the dot structure 111 increases as the thickness of the diffusion layer increases.
  • FIG. 3 is a schematic view showing the distribution of the dot structure 111 on the light guide plate 11 corresponding to the first embodiment
  • FIG. 5 is a schematic view showing the distribution of the dot structure 111 on the light guide plate 11 corresponding to the second embodiment.
  • the circle represents the dot.
  • the structure 111 and the finite number of dot structures 111 are taken as an example to illustrate the density variation of the dot structure 111, and the shape and distribution of the dot structure 111 are not limited.
  • six backlights 12 are taken as an example, and the directions of the light rays are indicated by arrows, which do not indicate the density of the light, and the number of the backlights 12 and the emitted light are not. Density is limited.
  • the density of the dot structure 111 on the light guide plate 11 increases as the thickness of the diffusion layer increases, that is, in a region where the diffusion layer is thick, the dot structure 111 on the light guide plate 11 is denser, and the diffusion layer is thinner.
  • the dot structure 111 on the light guide plate 11 is sparse.
  • the thickness of the diffusion film 152 is gradually decreased in the direction away from the backlight 12, and thus, in FIG. 3, the dot structure 111 on the light guide plate 11 is kept away from The direction of the backlight 12 is increasingly sparse.
  • the thickness of the diffusion film 152 gradually increases in a direction away from the backlight 12.
  • the dot structure 111 on the light guide plate 11 is along away from The direction of the backlight 12 is increasingly dense.
  • the density of the dot structure 111 on the light guide plate 11 is adjusted according to the thickness of the diffusion film 152, so that the light emission rate on the light-emitting surface of the backlight module is balanced, and the optical taste is high.
  • the surface of the optical structure 13 near the light guide plate 11 is generally disposed as a rough plane, and the optical structure 13 and the light guide plate 11 are prevented from being attached together.
  • the surface of the substrate 151 close to the light guide plate 11 is generally set to a rough plane.
  • the backlight module often appears yellowish due to the process of the light guide plate and the position of the backlight. Therefore, the specific color is, for example, blue. It is also possible to set the color of the pigment according to actual needs, and the color of the pigment is not limited here.
  • An embodiment of the present invention further provides a display device, including the backlight module described in the above embodiments, and a display panel located in a light emitting direction of the backlight module.
  • the display device can be applied to any product or component having a display function, such as a mobile phone, a tablet computer, a television set, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • the principle of the display device is similar to that of the backlight module. Therefore, the implementation of the display device can be referred to the implementation of the backlight module described above, and the repeated description is omitted.
  • the backlight module and the display device provided by the embodiments of the present invention add a pigment of a specific color to the optical structure on the light-emitting surface side of the light guide plate, and the content of the pigment in the optical structure increases along the direction away from the backlight.

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

Abstract

La présente invention concerne un module de rétroéclairage et un dispositif d'affichage. Le module de rétroéclairage comprend : un panneau de guidage de lumière (11) ; une source de rétroéclairage (12) positionnée sur une surface latérale du panneau de guidage de lumière (11) ; et une structure optique (13) positionnée d'un côté surface d'émission de lumière du panneau de guidage de lumière (11). Un pigment (14) ayant une couleur particulière est prévu dans la structure optique. Une concentration du pigment (14) dans la structure optique (13) augmente dans un sens qui va en s'éloignant de la source de rétroéclairage (12). Dans le module de rétroéclairage et le dispositif d'affichage, la lumière émise par la source de rétroéclairage traverse le panneau de guidage de lumière et se mélange ensuite avec la couleur du pigment de la structure optique pour former une lumière blanche, ce qui permet d'atténuer un problème de décalage de couleur se produisant dans un module de rétroéclairage. Le pigment selon la présente invention ne provoque pas de décalage de couleur supplémentaire, et le module de rétroéclairage a une période de réglage plus courte et a un faible coût.
PCT/CN2018/086532 2017-06-08 2018-05-11 Module de rétro-éclairage et dispositif d'affichage WO2018223807A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710428943.8 2017-06-08
CN201710428943.8A CN107102475A (zh) 2017-06-08 2017-06-08 一种背光模组及显示装置

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WO2018223807A1 true WO2018223807A1 (fr) 2018-12-13

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CN107102475A (zh) * 2017-06-08 2017-08-29 合肥京东方显示光源有限公司 一种背光模组及显示装置
KR102660065B1 (ko) * 2018-12-06 2024-04-22 엘지디스플레이 주식회사 백라이트 유닛 및 이를 이용한 표시 장치
KR102217600B1 (ko) * 2019-10-17 2021-02-19 현대모비스 주식회사 라이트가이드 장치 및 이의 순차적 점등방법
TWI768332B (zh) * 2020-04-28 2022-06-21 瑞儀光電股份有限公司 導光膜、背光模組及顯示裝置
CN114994823B (zh) * 2021-03-02 2024-01-30 北京小米移动软件有限公司 导光板、背光模组和终端
CN113156569A (zh) * 2021-04-23 2021-07-23 常州亚玛顿股份有限公司 一种低色偏的背光模组

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CN106324745A (zh) * 2015-07-01 2017-01-11 Lg电子株式会社 导光板以及具有该导光板的平面光源装置
CN105891936A (zh) * 2016-05-20 2016-08-24 京东方科技集团股份有限公司 导光元件及其制作方法以及背光模组
CN107102475A (zh) * 2017-06-08 2017-08-29 合肥京东方显示光源有限公司 一种背光模组及显示装置

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