WO2023279224A1 - Module de rétroéclairage et appareil d'affichage - Google Patents

Module de rétroéclairage et appareil d'affichage Download PDF

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Publication number
WO2023279224A1
WO2023279224A1 PCT/CN2021/104428 CN2021104428W WO2023279224A1 WO 2023279224 A1 WO2023279224 A1 WO 2023279224A1 CN 2021104428 W CN2021104428 W CN 2021104428W WO 2023279224 A1 WO2023279224 A1 WO 2023279224A1
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WO
WIPO (PCT)
Prior art keywords
light
backlight module
collecting element
guide plate
light source
Prior art date
Application number
PCT/CN2021/104428
Other languages
English (en)
Chinese (zh)
Inventor
张嘉尹
黄柏菖
林坤政
黄建智
Original Assignee
瑞仪光电(苏州)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 瑞仪光电(苏州)有限公司 filed Critical 瑞仪光电(苏州)有限公司
Priority to JP2021600167U priority Critical patent/JP3243169U/ja
Priority to PCT/CN2021/104428 priority patent/WO2023279224A1/fr
Publication of WO2023279224A1 publication Critical patent/WO2023279224A1/fr

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    • 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
    • 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
    • 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

Definitions

  • the invention relates to the field of display technology, in particular to a backlight module and a display device with a switchable viewing angle.
  • the industry has provided a display device with a dual-light source backlight module. As shown in FIG.
  • the display device 10 In the anti-peeping mode, the display device 10 only turns on the second light source 18 below, and the light emitted from the second light source 18 passes through the light guide plate 15 of the second layer, and then passes through the collection and absorption of the reverse prism sheet 14 and the light shielding sheet 13.
  • the light path is limited, and the light emitting angle of the light emitted from the display panel 11 is relatively narrow, so the display screen is only visible to the user himself, and the display device 10 has a narrow viewing angle function.
  • the display device 10 turns on the first light source 17 and the second light source 18 at the same time. The light emitted by the light board 12 will reach the display panel 11 at this time with more light, and the light emitting angle is wider, so the content of the display screen can be seen from different angles, and the display device 10 has a wide viewing angle function.
  • the aforementioned viewing angle switching technology uses two light guide plates.
  • two sets of backlight modules and light-shielding technology are used to achieve the purpose of viewing angle switching.
  • This structure uses more layers of optical plates or optical films, resulting in backlight The overall thickness and cost of the module remain high.
  • the purpose of the present invention is to provide a backlight module technology that integrates the light guide plate and the turning plate. It only needs one set of backlight modules to achieve the function of switching viewing angles, so that the overall thickness of the backlight module can be reduced, and the cost can also be reduced. reduce.
  • the present invention provides a backlight module, comprising: a light guide plate; a lower light source, which is adjacent to the side of the light guide plate; a light collecting element, which includes a light incident side and a bottom surface, and the light collecting element is adjacent to Located above the light guide plate, the bottom surface of the light collection element is provided with a plurality of light collection structures, and the plurality of light collection structures face the light guide plate; and an upper light source, which is adjacent to the entrance of the light collection element light side.
  • the light collecting element includes a first side and a second side connected to each other, the first side is parallel to the first direction, the second side is parallel to the second direction, and the first direction is perpendicular
  • the lower light source includes a plurality of light emitting diodes, and the plurality of light emitting diodes of the lower light source are arranged on the side of the light guide plate along the first direction.
  • the light-incident side of the light-collecting element is located on the first side
  • the upper light source includes a plurality of light-emitting diodes, and the plurality of light-emitting diodes of the upper light source are arranged on the light-collecting element along the first direction. the first side of the element.
  • the light-incident side of the light-collecting element is located on the second side
  • the upper light source includes a plurality of light-emitting diodes, and the plurality of light-emitting diodes of the upper light source are arranged on the side of the light-collecting element along the second direction. the second side.
  • the light collecting structure is a strip microstructure whose extending direction is substantially parallel to the first direction and perpendicular to the second direction.
  • the light collecting element is a reverse prism sheet, and each light collecting structure has a prism angle, and the tip of the prism angle faces the light guide plate.
  • the bottom surface of the light guide plate is used as a reflective surface, and a plurality of light guide structures are formed on the reflective surface.
  • Each light guide structure has a light-receiving surface and a non-light-receiving surface connected to each other.
  • a second included angle is formed between the light surface and the reflective surface, and the first included angle is an acute angle smaller than the second included angle.
  • uniformly distributed diffusion particles are arranged in the light collecting element.
  • the upper surface of the light collecting element opposite to the bottom surface has a diffusion particle layer.
  • the backlight module further includes a reflection sheet, and the reflection sheet is arranged under the light guide plate.
  • Another object of the present invention is to provide a display device, which utilizes a backlight module technology integrating a light guide plate and a turning plate, which can achieve the function of switching viewing angles with only one set of backlight modules, making the overall thickness of the display device Thinning can also reduce the cost.
  • the present invention provides a display device, which includes: the above-mentioned backlight module and a display panel adjacent to the top of the backlight module.
  • the present invention has the following characteristics: the backlight module of the present invention sets light sources respectively on the light guide plate and the light collecting elements above it, so that the light guide plate can be turned on when the lower light source is turned on and the upper light source is turned off.
  • the emitted light is turned and concentrated by the light-collecting element to emit light in the forward direction, realizing the narrow viewing angle anti-peeping mode of the backlight module;
  • the element is turned to emit light in the forward direction, and the light that does not pass through the light guide plate but only passes through the light collecting element is turned to disperse the light, realizing the wide viewing angle sharing mode of the backlight module.
  • the number of optical plates or optical films required by the backlight module of the present invention is small, so that the overall thickness of the backlight module can be reduced, and the cost can also be reduced.
  • FIG. 1 is a schematic side view of a display device of a conventional viewing angle switching backlight module.
  • FIG. 2 is a schematic diagram of a backlight module according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a backlight module according to another embodiment of the present application.
  • FIG. 4 is a schematic side view of a display device applying the embodiment shown in FIG. 3 .
  • FIG. 5 is a schematic diagram of a first implementation of a light collecting element in an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a second implementation of the light collecting element in the embodiment of the present application.
  • FIG. 7 is a first schematic diagram of light paths in an embodiment of the present application.
  • FIG. 8 is a second schematic diagram of the light path in the embodiment of the present application.
  • FIG. 9 is a graph of viewing angle-luminance of the display device applying the embodiment shown in FIG. 3 .
  • FIG. 10 is a schematic side view of a display device applying the embodiment shown in FIG. 2 .
  • FIG. 11 is a graph of viewing angle-luminance of the display device applying the embodiment shown in FIG. 2 .
  • the backlight module 100 includes: the light guide plate 200; the lower light source 400, which is adjacent to the side 210 of the light guide plate 200; the light collecting element 300, which includes the light incident side 311 (as shown in FIG. 2 ) or 321 (as shown in FIG. 3 As shown) and the bottom surface 340, the light collecting element 300 is adjacent to the top of the light guide plate 200, the bottom surface 340 of the light collecting element 300 is provided with a plurality of light collecting structures 350, and these light collecting structures 350 face the light guide plate 200; and the light source above 500, which is adjacent to the light-incident side 311 (as shown in FIG. 2 ) or 321 (as shown in FIG. 3 ) of the light-collecting element 500 .
  • the backlight module 100 of the present application is provided with light sources 400 and 500 respectively on the light guide plate 200 and the light collecting element 300 above it, so that when the lower light source 400 is turned on and the upper light source 500 is turned off, the light emitted through the light guide plate 200 can be collected.
  • the light element 300 turns and concentrates to emit light in the forward direction, realizing the narrow viewing angle anti-peeping mode of the backlight module 100; when both the lower light source 400 and the upper light source 500 are turned on, the light emitted by the lower light source 400 passes through the light guide plate 200 and passes through the light collecting element 300 bends to emit light in the forward direction, while the light from the upper light source 500 is dispersed through the bend of the light collecting element 300 to realize the wide viewing angle sharing mode of the backlight module 100 .
  • the number of optical plates or optical films required by the backlight module 100 of the present application is less, and the thickness of the overall structure can be reduced, and the cost can also be reduced.
  • the backlight module 100 further includes a reflective sheet 600 disposed under the light guide plate 200 .
  • FIG. 4 is a schematic side view of a display device applying the embodiment shown in FIG. 3 .
  • the display device 1000 at least includes a display panel 700 and the aforementioned backlight module 100 , and the display panel 700 is disposed adjacent to the top of the backlight module 100 .
  • the light collecting element 300 includes a first side 310 and a second side 320 connected to each other, the first side 310 is parallel to the first direction D1, the second side 320 is parallel to the second direction D2, and The first direction D1 is perpendicular to the second direction D2.
  • the lower light source 400 includes a plurality of light emitting diodes 410 arranged on the side 210 of the light guide plate 200 along the first direction D1 , and the side 210 is essentially the light incident side of the light guide plate 200 .
  • the light incident side 311 of the light collecting element 300 may be located on the first side 310
  • the upper light source 500 includes a plurality of light emitting diodes 510
  • the plurality of light emitting diodes 510 are arranged on the light collecting element 300 along the first direction D1. on the first side 310 (shown in FIG. 2 ).
  • the light-incident side 321 of the light-collecting element 300 is located on the second side 320
  • the upper light source 500 includes a plurality of light-emitting diodes 510, and the plurality of light-emitting diodes 510 are arranged on the light-collecting element along the second direction D2. 300 on the second side 320 (shown in FIG. 3 ).
  • the bottom surface 340 of the light collecting element 300 is provided with a plurality of light collecting structures 350, the light collecting structures 350 are strip microstructures, the extension direction of the strip microstructures is substantially parallel to the first direction D1, and is parallel to the first direction D1.
  • the two directions D2 are perpendicular.
  • the light collecting element 300 is an inverse prism sheet, and the light collecting structure 350 has a prism angle 351 , so the light collecting structure 350 is a strip microstructure with a prism angle 351 , and the tip of the prism angle 351 faces the light guide plate 200 .
  • each light guide structure 240 has a light-receiving surface 241 and a non-light-receiving surface 242 connected to each other.
  • the light-receiving surface 241 faces the light traveling direction of the light source 400 below, and a first included angle ⁇ is formed between the light-receiving surface 241 and the reflecting surface 230. , a second included angle ⁇ is formed between the non-light-receiving surface 242 and the reflective surface 230, and the first included angle ⁇ and the second included angle ⁇ are both acute angles, and the first included angle ⁇ is smaller than the second included angle ⁇ (as shown in FIG. 4 shown).
  • the design of the first included angle ⁇ and the second included angle ⁇ can change the degree of inclination between the light-receiving surface 241 and the non-light-receiving surface 242, so as to control the direction and concentration of the light emitted from the light-emitting surface of the light guide plate 200 for light collection.
  • the element 300 is further used to effectively guide the light to exit the light at a positive viewing angle.
  • the display device 1000 will only provide light through the lower light guide plate 200, and the light guide structure 240 of the light collecting element 300 is used to convert the light into the forward direction to realize the backlight module 100. Narrow viewing angle privacy mode. If both the lower light source 400 and the upper light source 500 are turned on, in addition to the light from the lower light source 400 passing through the light guide plate 200 and then being turned forward by the light collecting element 300, the light from the upper light source 500 will also pass through the light collecting element 300 turns to disperse the light, realizing the wide viewing angle sharing mode of the backlight module 100 .
  • the light collecting element 300 can use diffusing particles to improve the side viewing angle energy of the sharing mode and provide a wide viewing angle distribution.
  • diffusing particles to improve the side viewing angle energy of the sharing mode and provide a wide viewing angle distribution.
  • uniformly distributed diffusion particles 301 are provided in the light-collecting element 300, so that the light passing through the light-collecting element 300 has a better turning and dispersion, so as to Provides a wide viewing angle distribution.
  • a diffusion particle layer 370 (as shown in FIG.
  • the light passing through the upper surface 360 of the light-collecting element 300 can be better
  • the turns are dispersed to provide a wide viewing angle distribution.
  • FIG. 7 and FIG. 8 illustrate the light path using the backlight module shown in FIG. 3 .
  • a lower light source 400 and an upper light source 500 are respectively arranged on the light guide plate 200 and the light collecting element 300 above it, and the lower light sources 400 arranged on the light guide plate 200 are arranged along the first direction D1 and arranged on the light collecting element.
  • the upper light sources 500 of 300 are arranged along the second direction D2, and the lower light sources 400 and the upper light sources 500 are arranged perpendicular to each other.
  • the light L1 emitted by the lower light source 400 will be reflected by the light guide plate 200 with high directivity, and will be turned and concentrated by the light collection structure 350 of the light collection element 300 to be forward light (as shown in FIG. 7
  • the dotted line pointing up arrow by only providing light to the display panel 700 by the light guide plate 200, the narrow viewing angle distribution of the light output direction of the backlight module 100 is realized, that is, the upward pointing arrow of the dotted line shown in FIG. 1000 presents a narrow viewing angle anti-peep mode.
  • the light L2 of the upper light source 500 is also emitted by the light-collecting element 300 Turning scattered light (as shown in FIG. 8 , the dotted line is directed toward the upper left and the oblique arrows toward the upper right), and the light is provided to the display panel 700 by the light guide plate 200 and the light collecting element 300 at the same time, so that the light output direction of the backlight module 100 can be realized.
  • the distribution of wide viewing angles that is, in addition to the upward arrows of the dotted lines that emit light in the forward direction in FIG.
  • the light collecting element 300 can make the light L2 have better turning and dispersion by means of diffusing particles, so as to improve the energy of the side viewing angle of the sharing mode, thereby providing a wide viewing angle distribution.
  • the extension directions of the upper light source 500 and the light collecting structure 350 are respectively parallel to the mutually perpendicular second direction D2 and the first direction D1, that is, the upper light source 500 is located on a certain side of the light collecting element 300, therefore, the collecting When viewed along the first direction D1, the optical structure 350 presents a triangle as shown in FIG. 7 , and when viewed along the second direction D2, it presents a plane as shown in FIG. 8 , which is easy to totally reflect the light emitted by the light source 500 above.
  • the phenomenon of oblique light output can also produce left-right asymmetry, that is, the light intensity represented by the oblique arrow facing the upper right of the dotted line in Figure 8 is greater than that of the dotted line
  • the intensity of light represented by the upward-left slanting arrow makes the wide-angle sharing mode presented by the display device 1000 more suitable for the vehicle-mounted display installed in the center of the vehicle for viewing by the driver's seat or the passenger seat on one side.
  • the luminance of the emitted light is concentrated between -40 degrees and 40 degrees, but when the lower light source 400 and the upper When the light sources 500 are turned on at the same time, the luminance of the emitted light at a viewing angle greater than 40 degrees will be improved. After measurement, the viewing angles of 40 degrees and 45 degrees both have the effect of increasing the viewing angle energy.
  • FIG. 10 is a schematic side view of a display device applying the embodiment shown in FIG. 2 .
  • a lower light source 400 and an upper light source 500 are respectively arranged on the light guide plate 200 and the light collecting element 300 above it, and the lower light sources 400 arranged on the light guide plate 200 are arranged along the first direction D1 and arranged on the light collecting element.
  • the upper light sources 500 of 300 are arranged along the first direction D1, and the lower light sources 400 and the upper light sources 500 are arranged in the same direction.
  • the light emitted from the light guide plate can be turned and concentrated into the forward direction when the lower light source is turned on and the upper light source is turned off.
  • Light is emitted to realize the narrow viewing angle anti-peeping mode of the backlight module; when both the lower light source and the upper light source are turned on, not only the light emitted from the light guide plate is turned by the light collecting element to emit light in the forward direction, but also the light that does not pass through the light guide plate but only The light in the light-collecting element is dispersed to realize the wide viewing angle sharing mode of the backlight module.
  • This application does not need to use a light-shielding sheet to achieve the function of switching viewing angles.
  • the number of optical plates or optical films required by the present invention is small, so that the overall thickness of the backlight module can be reduced, and the cost can also be reduced. .

Abstract

L'invention concerne un module de rétroéclairage (100) et appareil d'affichage (1000). Le module de rétroéclairage (100) comprend : une plaque de guidage de lumière (200) ; une source de lumière inférieure (400) disposée adjacente à un bord latéral de la plaque de guidage de lumière (200) ; un élément de collecte de lumière (300) disposé adjacent à la plaque de guidage de lumière et au-dessus de celle-ci (200), une surface inférieure de l'élément de collecte de lumière (300) étant pourvue d'une pluralité de structures de collecte de lumière (350), et la pluralité de structures de collecte de lumière (350) faisant face à la plaque de guidage de lumière (200) ; et une source de lumière supérieure (500) disposée adjacente à un côté d'incidence de lumière de l'élément de collecte de lumière (300). L'appareil d'affichage (1000) comprend un écran d'affichage (700) et un module de rétroéclairage (100). Le module de rétroéclairage (100) et l'appareil d'affichage (1000) obtiennent un mode à l'épreuve des regards indiscrets à vue étroite en allumant uniquement la source de lumière inférieure (400), ou obtiennent un mode de partage de vue large en allumant la source de lumière inférieure (400) et la source de lumière supérieure (500) simultanément.
PCT/CN2021/104428 2021-07-05 2021-07-05 Module de rétroéclairage et appareil d'affichage WO2023279224A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2021600167U JP3243169U (ja) 2021-07-05 2021-07-05 バックライトモジュール及び表示装置
PCT/CN2021/104428 WO2023279224A1 (fr) 2021-07-05 2021-07-05 Module de rétroéclairage et appareil d'affichage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/104428 WO2023279224A1 (fr) 2021-07-05 2021-07-05 Module de rétroéclairage et appareil d'affichage

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WO2023279224A1 true WO2023279224A1 (fr) 2023-01-12

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Citations (11)

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US20120195063A1 (en) * 2011-01-31 2012-08-02 Samsung Electronics Co., Ltd. Backlight assembly and display apparatus having the same
CN103299358A (zh) * 2011-11-28 2013-09-11 松下电器产业株式会社 显示装置
JP2016122627A (ja) * 2014-12-25 2016-07-07 大日本印刷株式会社 面光源装置および表示装置
CN107179627A (zh) * 2016-03-09 2017-09-19 扬升照明股份有限公司 光源模块以及显示装置
US20170329073A1 (en) * 2016-05-12 2017-11-16 Young Lighting Technology Inc. Light source module and display device
CN109870836A (zh) * 2019-03-28 2019-06-11 合肥京东方光电科技有限公司 背光模组及其制造方法、显示装置及其控制方法
CN209433052U (zh) * 2019-02-25 2019-09-24 昆山龙腾光电有限公司 一种导光板、背光模组及显示装置
CN211236517U (zh) * 2019-12-24 2020-08-11 中强光电股份有限公司 背光模块及显示装置
CN112835216A (zh) * 2021-03-03 2021-05-25 武汉华星光电技术有限公司 背光模组及显示面板
US20210181580A1 (en) * 2019-12-11 2021-06-17 Coretronic Corporation Backlight module and display apparatus
CN113556532A (zh) * 2021-07-20 2021-10-26 北京京东方显示技术有限公司 一种显示装置

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120195063A1 (en) * 2011-01-31 2012-08-02 Samsung Electronics Co., Ltd. Backlight assembly and display apparatus having the same
CN103299358A (zh) * 2011-11-28 2013-09-11 松下电器产业株式会社 显示装置
JP2016122627A (ja) * 2014-12-25 2016-07-07 大日本印刷株式会社 面光源装置および表示装置
CN107179627A (zh) * 2016-03-09 2017-09-19 扬升照明股份有限公司 光源模块以及显示装置
US20170329073A1 (en) * 2016-05-12 2017-11-16 Young Lighting Technology Inc. Light source module and display device
CN209433052U (zh) * 2019-02-25 2019-09-24 昆山龙腾光电有限公司 一种导光板、背光模组及显示装置
CN109870836A (zh) * 2019-03-28 2019-06-11 合肥京东方光电科技有限公司 背光模组及其制造方法、显示装置及其控制方法
US20210181580A1 (en) * 2019-12-11 2021-06-17 Coretronic Corporation Backlight module and display apparatus
CN211236517U (zh) * 2019-12-24 2020-08-11 中强光电股份有限公司 背光模块及显示装置
CN112835216A (zh) * 2021-03-03 2021-05-25 武汉华星光电技术有限公司 背光模组及显示面板
CN113556532A (zh) * 2021-07-20 2021-10-26 北京京东方显示技术有限公司 一种显示装置

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