WO2020233394A1 - Module de rétroéclairage et dispositif d'affichage - Google Patents

Module de rétroéclairage et dispositif d'affichage Download PDF

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Publication number
WO2020233394A1
WO2020233394A1 PCT/CN2020/088388 CN2020088388W WO2020233394A1 WO 2020233394 A1 WO2020233394 A1 WO 2020233394A1 CN 2020088388 W CN2020088388 W CN 2020088388W WO 2020233394 A1 WO2020233394 A1 WO 2020233394A1
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WO
WIPO (PCT)
Prior art keywords
light
supporting
light guide
backlight module
display panel
Prior art date
Application number
PCT/CN2020/088388
Other languages
English (en)
Chinese (zh)
Inventor
钟维
韩金
王铮
王昊
张菲菲
石海军
张伟
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Publication date
Application filed by 京东方科技集团股份有限公司, 北京京东方显示技术有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2020233394A1 publication Critical patent/WO2020233394A1/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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the present disclosure relates to the technical field of display product manufacturing, in particular to a backlight module and a display device.
  • LCD liquid crystal displays
  • LED small-pitch light-emitting diodes
  • DLP Digital Light Processing
  • OLED Organic Light-Emitting Diode
  • the typical edge width of the LCD screen is only 0.5 ⁇ 0.6mm, but limited by the molding process of the frame, the width of the support surface on the frame used to support the panel (Panel) The limit is usually 1mm, so the inner wall of the frame will enter the AA area, causing pixels in the display area at the edge of the LCD screen to be blocked.
  • the present disclosure provides a backlight module for a display panel, including a frame and a backlight.
  • the backlight includes a light source and a diffuser arranged on the light exit side of the light source.
  • the frame is provided with a light incident surface and a The light guide structure of the light-emitting surface is used for guiding the light projected by the backlight source to the light-incident surface from the light-emitting surface, and the light-emitting surface is located in the edge display area of the display panel.
  • the frame includes a first support portion for supporting the edge area of the display panel and a second support portion that partially extends to the side of the diffuser facing the light source to support the diffuser, the first support and The second supporting portion forms a step structure;
  • the light guide structure includes a first part on the first support part, a second part on the second support part, and a connecting part between the first part and the second part.
  • One part includes a light exit surface away from the first support part
  • the second part includes a first support surface for supporting the diffuser plate and a light incident surface adjacent to the first support surface.
  • the first supporting surface has a predetermined included angle, so that the light incident from the light incident surface propagates in the light guide structure in a manner of total reflection, and exits from the light exit surface.
  • the side surface of the second part facing the step structure is an inclined surface, so that the light incident from the light incident surface is reflected by the inclined surface and exits the light exit surface.
  • the angle between the inclined surface and the connecting surface of the second support portion for connecting with the second part is a first angle, so that the light reflected by the inclined surface is perpendicular to the light output Face shot.
  • the light guide structure is made of a transparent material.
  • the frame includes a first support portion for supporting an edge area of the display panel, and the first support portion includes a second support surface for supporting the edge area of the display screen and an inner surface facing the diffuser;
  • the light guide structure includes a light guide strip disposed on the inner side surface, the light guide strip includes a light exit surface that is located on the same plane as the second supporting surface, and the light guide strip is disposed on a side facing the diffuser plate There is a grating that deflects the light incident on the light guide structure to exit from the light exit surface of the light guide structure.
  • the grating is a chirped diffraction grating, and the grating period d of the chirped diffraction grating gradually decreases along the direction from the light source to the diffuser.
  • the grating period d of the chirped diffraction grating is obtained according to the following formula:
  • ⁇ m sin -1 (n*sin ⁇ i –m* ⁇ /d)
  • ⁇ m is the exit angle
  • ⁇ i is the incident angle
  • n is the refractive index of the grating material
  • m is the diffraction order
  • ⁇ is the wavelength of the light
  • d is the grating period.
  • the light guide strip is made of transparent material.
  • the frame is made of aluminum material and formed by an aluminum extrusion process.
  • the present disclosure provides a display device including the above-mentioned backlight module and a display panel.
  • the edge area of the display panel includes a non-display area and an edge display area.
  • Figure 1 shows a schematic diagram of a part of the structure of a display device in the related art
  • FIG. 2 shows the first structural diagram of a display device in an embodiment of the present disclosure
  • FIG. 3 shows an enlarged schematic diagram of a part of the structure of the display device in FIG. 2;
  • FIG. 4 shows the second structural diagram of the display device in the embodiment of the present disclosure
  • FIG. 5 shows an enlarged schematic diagram of a part of the structure of the display device in FIG. 4;
  • Figure 6 shows a schematic diagram of the structure of the light guide strip.
  • the width limit of the support surface on the frame 2 for supporting the display panel 1 is usually If the supporting surface of the frame 2 is too narrow, the supporting strength of the frame 2 will be reduced. Therefore, the inner wall of the frame 2 will enter the effective display area, resulting in the display area 112 at the edge of the display panel (that is, the effective display area is adjacent to the non-display area 111). The pixels in the edge area) are blocked.
  • this embodiment provides a backlight module, which can guide light to the edge display area of the display panel while supporting the display panel through the arrangement of the light guide structure, thereby solving the problem that pixels in the edge display area are blocked. The problem.
  • the backlight module provided by this embodiment includes a frame and a backlight.
  • the backlight includes a light source and a diffuser arranged on the light exit side of the light source.
  • the frame is provided with a light incident surface and The light guide structure of the light-emitting surface is used for guiding the light projected by the backlight source to the light-incident surface from the light-emitting surface, and the light-emitting surface is located in the edge display area of the display panel.
  • the arrangement of the light guide structure can guide light to the edge display area of the display panel, and can support the display panel, can improve the brightness uniformity of the display panel, and solve the problem that pixels in the effective display area of the display panel are blocked.
  • the frame includes a first support portion for supporting the display panel, and at least part of the light guide structure is disposed on the inner side of the first support portion (that is, the first support portion faces a side of the diffuser plate). side).
  • the backlight source includes a light source and a diffuser 6 arranged on the light emitting side of the light source, and the frame includes a first support portion for supporting the edge area of the display panel. 21 and partly extend to the side of the diffuser plate 6 facing the light source to support the second support portion 22 of the diffuser plate 6, and the first support portion 21 and the second support portion 22 form a stepped structure;
  • the light guide structure 3 is arranged on the first support portion 21 and the second support portion 22 of the step structure, and is formed as a step structure matching the step structure.
  • the light guide structure 3 includes a first portion 31 located on the first support portion 21, a second portion 32 located on the second support portion 22, and a first portion 31 and a second portion located on the The connecting part 33 between the 32 (refer to FIG. 3, it should be noted that, in order to better distinguish the first part 31, the second part 32 and the connecting part 33, the dotted line is used to distinguish in FIG.
  • the first portion 31 includes a light-emitting surface away from the first supporting portion 21, and the second portion 32 includes a first supporting surface for supporting the diffuser plate 6 and the first supporting surface.
  • the structure 3 propagates and exits from the light exit surface.
  • the dashed line 100 in FIG. 3 indicates the light path of incident light entering the light guide structure 3.
  • the first part 31 is arranged between the first supporting part 21 and the display panel and supports the display panel, and the light guide structure 3 is arranged so that the light emitted by the light source is incident on the light incident surface 322 , And propagate in the light guide structure 3 in a way of total reflection, and then exit from the light exit surface.
  • the light exit surface on the first part 31 is supported and connected to the display The edge area 11 of the panel.
  • the edge area 11 of the display panel includes a non-display area 111 and an edge display area 112. Under the light guiding and supporting action of the light guiding structure 3, the connection strength between the backlight module and the display panel is ensured , And solves the problem that pixels in the edge display area are blocked.
  • the side surface of the second portion 32 facing the step structure is an inclined surface 321 arranged obliquely to the light incident surface 322, so that the light incident from the light incident surface 322 is reflected by the inclined surface 321 After that, it emits from the light emitting surface.
  • the inclined surface 321 is arranged so that the light incident from the light incident surface 322 into the light guide structure 3, after being reflected by the inclined surface 321, can directly propagate to the light exit surface of the first portion 31 and exit.
  • the path for total reflection in the light guide structure 3 is omitted.
  • the angle between the inclined surface 321 and the connecting surface of the second support portion 22 for connecting with the second portion 32 is a first angle, so that the light reflected by the inclined surface is perpendicular It emits on the light emitting surface.
  • the orthographic projection of the first support portion 21 of the frame 2 on the display panel 1 is located in the non-display area 111 of the display panel 1, and the connecting portion 33 is on the display panel 1.
  • the orthographic projection is located at the edge display area 112 of the display panel 1.
  • the light incident on the light guide structure 3 is reflected by the inclined surface and exits perpendicular to the light exit surface, and directly enters the edge display area 112 of the display panel 1.
  • the problem that the pixels in the effective display area of the display panel 1 are blocked is solved, and light is prevented from entering the non-display area 111 of the display panel 1 to cause light loss.
  • first angle and the inclination angle of the light incident surface relative to the connecting surface of the second support portion 22 connected to the second portion 32 can be set according to actual needs, and the two are mutually exclusive. It cooperates so that the light incident from the light incident surface into the light guide structure 3 is reflected by the inclined surface 321 and exits perpendicular to the light exit surface.
  • the first angle is 45 degrees, and the propagation path in the second portion 32 of the light incident from the light incident surface 322 into the light guide structure 3 is different from that of the second portion.
  • the first supporting surfaces on 32 are parallel, but not limited to this.
  • the light guide structure 3 is made of a transparent material.
  • the light guide structure 3 is made of a hard and transparent material, such as quartz glass, but it is not limited to this.
  • the gap is set as a space reserved for the deformation of the diffuser plate 6 to prevent the light guide structure 3 and the diffuser plate 6 Interference.
  • the light source includes a plurality of LED lamps 5, but not limited to this.
  • an optical film 7 is provided on the diffusion plate 6 to improve the brightness and uniformity of the light incident on the display panel 1.
  • the backlight module further includes a back plate 4, the LED lights 5 are arranged on the backlight plate, and the diffuser plate 6 is accommodated in an accommodation space formed by the back plate 4 and the frame 2.
  • the frame 2 is made of aluminum material and formed by an aluminum extrusion process.
  • the frame 2 is made of aluminum metal, which improves the support strength of the frame 2, and the frame 2 is formed through an aluminum extrusion process, which effectively ensures the accuracy of the size setting of the frame 2.
  • the backlight source includes a light source and a diffuser 6 arranged on the light emitting side of the light source
  • the frame 2 includes a first support for supporting the edge area 11 of the display panel 1.
  • the first supporting part 21 includes a second supporting surface for supporting the edge region 11 of the display screen and an inner side surface facing the diffuser 6;
  • the light guide structure includes a light guide strip 8 disposed on the inner side surface, the light guide strip 8 includes a light exit surface that is located on the same plane as the second supporting surface, and the light guide strip 8 faces the diffuser 6
  • a grating 81 is provided on one side of the light guide structure to deflect the light incident on the light guide structure so as to be emitted from the light exit surface of the light guide structure.
  • the light-emitting surface of the light guide strip 8 and the second supporting surface on the same plane and the second supporting surface of the frame 2 jointly support the display panel 1, ensuring that the backlight module and the display panel 1
  • the second support surface is used to support the non-display area 111 of the display panel 1
  • the light exit surface of the light guide strip 8 is used to support the edge display area 112 of the display panel 1
  • the light guide strip 8 can The light is guided to the edge display area 112 of the display panel 1 to solve the problem that the pixels in the effective display area of the display panel 1 are blocked.
  • the grating 81 is a chirped diffraction grating 81, and the period d of the grating 81 of the chirped diffraction grating 81 gradually decreases along the direction from the light source to the diffuser 6.
  • the light incident on the grating 81 will be deflected in its propagation direction, and the deflection angle will change with the period d of the grating 81.
  • the light deflected by the grating 81 exits the light exit surface of the light guide strip 8 and finally enters The edge display area 112 of the display panel 1.
  • the period d of the grating 81 of the chirped diffraction grating 81 is obtained according to the following formula:
  • ⁇ m sin -1 (n*sin ⁇ i –m* ⁇ /d)
  • ⁇ m is the exit angle
  • ⁇ i is the incident angle
  • n is the refractive index of the grating 81 material
  • m is the diffraction order
  • ⁇ is the wavelength of the light
  • d is the grating 81 period.
  • the constraints of parameters such as the period d of the grating 81 and the incident angle and exit angle of the incident light are as shown in the above formula.
  • the parameters of the grating 81 and the incident angle of the incident light can be set according to the above formula, so that the light is The light exit surface of the light guide bar 8 emits and enters the effective edge display area of the display panel 1.
  • the grating 81 is formed by processing bumps or pits on the side of the light guide strip 8 facing the diffusion plate 6 by chemical etching, exposure and development, or plasma etching.
  • the light guide strip 8 is made of a transparent material, such as PMMA (polymethyl methacrylate), MS (copolymer of methyl methacrylate and styrene) or PC (polymethyl methacrylate). Carbonate), etc., effectively solve the problem that the effective edge display area of the display panel 1 is dark and the pixels in the effective edge display area are blocked.
  • PMMA polymethyl methacrylate
  • MS copolymer of methyl methacrylate and styrene
  • PC polymethyl methacrylate
  • Carbonate etc.
  • the gap is set as a space reserved for the deformation of the diffuser plate 6 to prevent the light guide strip 8 and the diffuser plate 6 Interference.
  • the light source is a plurality of LED lamps 5, but it is not limited thereto.
  • the backlight module further includes a back plate 4, the LED lights 5 are arranged on the backlight plate, and the diffuser plate 6 is accommodated in an accommodation space formed by the back plate 4 and the frame 2.
  • the frame 2 is made of aluminum material and formed by an aluminum extrusion process.
  • the frame 2 is made of aluminum metal, which improves the support strength of the frame 2, and the frame 2 is formed through an aluminum extrusion process, which effectively ensures the accuracy of the size setting of the frame 2.
  • This embodiment also provides a display device including the above-mentioned backlight module.
  • the arrangement of the light guide structure can guide light to the edge display area 112 of the display panel 1, and can replace at least part of the frame 2 to support the display panel 1, and can improve the uniformity of the brightness of the display panel 1 and solve the problem of 1The problem that pixels in the effective display area are blocked.
  • the display device further includes a display panel 1.
  • the edge area 11 of the display panel 1 includes a non-display area 111 and an edge display area 112, and the display device includes the backlight module provided in Embodiment 1, wherein The first part 31 of the light guide structure 3 is supported and connected to the edge area 11 of the display panel 1.
  • the first portion 31 of the light guide structure 3 is connected to the edge area 11 of the display panel 1 through an adhesive layer.
  • the light guide structure 3 is not only supported in the non-display area 111 of the display panel 1, but also supported in the edge display area 112 of the display panel 1, which not only supports the display panel 1, ensures the support strength and solves the problem
  • the display panel 1 edge display area 112 pixels are blocked.
  • the adhesive layer may be UV curing glue or hot melt glue.
  • the display device further includes a display panel 1.
  • the edge area 11 of the display panel 1 includes a non-display area 111 and an edge display area 112, and the display device includes the backlight module described in the second embodiment,
  • the light guide structure includes a light guide strip 8, a light emitting surface of the light guide strip 8 is supported and connected to the edge display area 112, and the second supporting surface of the first supporting portion 21 is supported and connected to the non- Display area 111.
  • the light guide strip 8 and the first support portion 21 of the frame 2 jointly support the display panel 1, and the first support portion 21 of the frame 2 supports the non-display area 111 of the display panel 1, and the light guide
  • the bar 8 is supported on the edge display area 112 of the display panel 1 to ensure the support strength of the display panel 1 and the light guide function of the light guide bar 8 solves the problem that the pixels in the effective display area of the display panel 1 are blocked.
  • the second supporting surface of the first supporting portion 21 is connected to the display panel 1 through an adhesive layer, and the light emitting surface of the light guide strip 8 is connected to the display panel 1 through an adhesive layer.
  • the adhesive layer can be UV curing glue or hot melt glue.
  • the display device may be any product or component with a display function such as an LCD TV, a liquid crystal display, a digital photo frame, a mobile phone, a tablet computer, etc.
  • the display device also includes a flexible circuit board, a printed circuit board and a backplane 4.

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

Abstract

La présente invention concerne un module de rétroéclairage comprenant un châssis moulé et une source de rétroéclairage. Le châssis moulé est pourvu d'une structure de guidage de lumière (3) utilisée pour guider la lumière émise par la source de rétroéclairage vers une région d'affichage de bord d'un panneau d'affichage. L'invention concerne également un dispositif d'affichage comportant le module de rétroéclairage.
PCT/CN2020/088388 2019-05-23 2020-04-30 Module de rétroéclairage et dispositif d'affichage WO2020233394A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910434655.2 2019-05-23
CN201910434655.2A CN110161751A (zh) 2019-05-23 2019-05-23 背光模组及显示装置

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WO2020233394A1 true WO2020233394A1 (fr) 2020-11-26

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CN115735153A (zh) * 2021-06-29 2023-03-03 京东方科技集团股份有限公司 背光组件、显示面板及显示装置
CN113534521A (zh) * 2021-08-02 2021-10-22 宁波视睿迪光电有限公司 一种边框及显示模组
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