WO2014067195A1 - 背光模块及显示装置 - Google Patents

背光模块及显示装置 Download PDF

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Publication number
WO2014067195A1
WO2014067195A1 PCT/CN2012/085117 CN2012085117W WO2014067195A1 WO 2014067195 A1 WO2014067195 A1 WO 2014067195A1 CN 2012085117 W CN2012085117 W CN 2012085117W WO 2014067195 A1 WO2014067195 A1 WO 2014067195A1
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WO
WIPO (PCT)
Prior art keywords
light
optical fiber
backlight module
guide plate
opening length
Prior art date
Application number
PCT/CN2012/085117
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English (en)
French (fr)
Inventor
胡哲彰
贺虎
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/703,946 priority Critical patent/US8848137B2/en
Publication of WO2014067195A1 publication Critical patent/WO2014067195A1/zh

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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
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • 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
    • G02B6/0005—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 of the fibre type
    • G02B6/001—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 of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces

Definitions

  • the present invention relates to a backlight module and a display device, and more particularly to a backlight module and a display device using external light.
  • Liquid crystal display (Liquid Crystal Display, LCD) has been widely used in a variety of electronic products, most of the liquid crystal display is a backlight type liquid crystal display, which is composed of a liquid crystal display panel and a backlight module (backlight Module).
  • the backlight module can be divided into a side-light type and a direct-light type according to the incident position of the light source (Direct-light) Type) Two to provide a backlight to the LCD panel.
  • Direct-light Direct-light
  • the light source of the backlight module is a light-emitting diode (Light-Emitting) Diode, LED) or Cold Cathode Fluorescent Lamp, CCFL), which needs to emit white light by mixing the phosphors, has a weak color performance and a narrow color gamut, and it is difficult to provide the true color of the image. Furthermore, the light source of the backlight module consumes more power, especially for large-sized liquid crystal displays.
  • the invention provides a backlight module and a display device to solve the problems of the light source of the backlight module.
  • a main object of the present invention is to provide a backlight module, where the backlight module includes:
  • An optical fiber light-emitting substrate is connected to the optical fiber, wherein the optical fiber light-emitting substrate has a plurality of light-emitting openings for emitting light emitted by the optical fibers;
  • the light guide plate includes a plurality of astigmatism concave portions, the astigmatism concave portion is the light exiting opening facing the optical fiber light-emitting substrate, and each of the astigmatism concave portions has a first opening length and a second opening length, the first opening length being greater than the second opening length.
  • Another object of the present invention is to provide a backlight module, the backlight module comprising:
  • An optical fiber light-emitting substrate is connected to the optical fiber, wherein the optical fiber light-emitting substrate has a plurality of light-emitting openings for emitting light emitted by the optical fibers;
  • the light guide plate includes a plurality of astigmatism concave portions, the astigmatism concave portion is the light exiting opening facing the optical fiber light-emitting substrate, and each of the astigmatism concave portions has a first opening length and a second opening length, the first opening length being greater than the second opening length, the first opening length being parallel to a long axis direction of the astigmatism recess and parallel to the light guide plate The direction of the long axis of the side entrance surface, the length of the second opening being perpendicular to the length of the first opening.
  • the backlight module includes:
  • An optical fiber light-emitting substrate is connected to the optical fiber, wherein the optical fiber light-emitting substrate has a plurality of light-emitting openings for emitting light emitted by the optical fibers;
  • the light guide plate includes a plurality of astigmatism concave portions, the astigmatism concave portion is the light exiting opening facing the optical fiber light-emitting substrate, and each of the astigmatism concave portions has a first opening length and a second opening length, the first opening length being greater than the second opening length.
  • the first opening length is parallel to a long axis direction of the astigmatism concave portion and parallel to a long axis direction of a side light incident surface of the light guide plate.
  • the cross-sectional shape of the astigmatism concave portion is a circular arc shape, a triangle shape or a polygonal shape.
  • the first opening length is between 3 mm and 5 cm.
  • the second opening length is perpendicular to the first opening length.
  • the second opening length is between 3 mm and 2 cm.
  • each of the astigmatism recesses has an angle with a side entrance light surface of the light guide plate, the angle being greater than 90 degrees.
  • the angle is from 105 degrees to 175 degrees.
  • the light-emitting end of the optical fiber is at a maximum depth of the astigmatism concave portion.
  • the backlight module and the display device of the present invention can effectively use external light to form a backlight, thereby greatly reducing the power consumption of the light source, and generally having a wider light due to external light.
  • the color gamut, the display device using the backlight module of the present invention can provide images with real colors, and greatly improve the image display quality.
  • the light transmitted from the optical fiber can be laterally diffused through the astigmatism concave portion of the light guide plate to achieve the effect of mixing light and shorten the light mixing distance of the light guide plate. It can also reduce the uneven spot problem on the light entrance side.
  • FIG. 1 is a schematic view of an embodiment of a display device of the present invention
  • FIG. 2 is a schematic view of an embodiment of a backlight module of the present invention
  • FIG. 3 is a schematic view of an embodiment of an optical fiber of the present invention.
  • FIG. 4 is a schematic view showing an embodiment of an astigmatism concave portion of a light guide plate of the present invention
  • 5A to 5C are top views of an embodiment of an astigmatism concave portion of a light guide plate of the present invention.
  • FIG. 6 is a schematic view of another embodiment of a backlight module of the present invention.
  • the word “comprising” is to be understood to include the component, but does not exclude any other component.
  • “on” means located above or below the target component, and does not mean that it must be on the top based on the direction of gravity.
  • FIG. 1 is a schematic diagram of an embodiment of a display device according to the present invention
  • FIG. 2 is a schematic diagram of an embodiment of a backlight module of the present invention
  • the backlight module 100 is disposed relative to a display panel 101 (eg, a liquid crystal display panel) to form a display device (eg, a liquid crystal display device).
  • the backlight module 100 includes a plurality of optical fibers 111, an optical fiber light emitting substrate 120, a light guide plate 130, a light collector 140, a back plate 150, a reflective layer 160, and an optical film 170.
  • the optical fiber 111 is connected between the concentrator 140 and the optical fiber emitting substrate 120 for transmitting light.
  • the optical fiber light emitting substrate 120 is disposed between the optical fiber 111 and the light guide plate 130 for fixing the optical fiber 111, and allows the light transmitted by the optical fiber 111 to enter the light guide plate 130.
  • the concentrator 140 is coupled to the optical fiber 111 for collecting external light, such as sunlight or indoor light, to provide light to the optical fiber 111.
  • the light guide plate 130 can be carried on the back plate 150.
  • the reflective layer 160 is formed between the back plate 150 and the light guide plate 130 for reflecting light.
  • the optical film 170 is disposed on the light guide plate 130 to improve the optical effect.
  • the plurality of optical fibers 111 of the present embodiment may be covered by a sheath to form a bundle of optical fibers 110 for convenient connection to the concentrator 140.
  • One end of the fiber bundle 110 is connected to the concentrator 140, and the separated optical fiber 111 is connected to the optical fiber illuminating plate 120.
  • FIG. 3 is a schematic diagram of an embodiment of an optical fiber of the present invention.
  • the optical fiber 111 of this embodiment may have an optical fiber core 113, a cladding layer 114, and a buffer layer 115.
  • a fiber core 113 can be made of, for example, quartz or PMMA for conducting light.
  • the cladding 114 is made of a hard polymer (hard Made of polymer) for covering the optical fiber core 113.
  • the buffer layer 115 may be made of, for example, tetrafluoroethylene for preventing the optical fiber 111 from being damaged.
  • the optical fiber light-emitting board 120 of the present embodiment is disposed between the optical fiber 111 and the light guide plate 130 for emitting light transmitted by the optical fiber 111.
  • the optical fiber-emitting substrate 120 has a plurality of light-emitting openings 121 for exposing the light-emitting end of the optical fiber 111, so that the light transmitted by the optical fiber 111 can be emitted from the light-emitting port 121 of the optical fiber-emitting substrate 120 and enter the light guide plate 130.
  • the arrangement pitch of the light exit opening 121 may be less than or equal to 16 millimeters (mm) to ensure that the light can be dispersed into the light guide plate 130 to form a uniform surface light source.
  • the diameter (or width) of each of the light exits 121 can be less than or equal to 2.5 mm, so that the light transmitted by the optical fiber 111 can be sufficiently emitted by the light exit opening 121.
  • the light guide plate 130 of the present embodiment is disposed on one side of the optical fiber light emitting substrate 120 .
  • the light guide plate 130 can utilize injection molding (Injection Molding) is made of a photocurable resin, polymethyl methacrylate (PMMA) or polycarbonate (PC) for guiding the light transmitted by the optical fiber 111 to the liquid crystal display panel 101.
  • the light guide plate 130 has a light emitting surface 131, a light reflecting surface 132, a side light incident surface 133, and a plurality of astigmatism concave portions 134.
  • the light-emitting surface 131 is formed on one side of the light guide plate 130 and faces the liquid crystal display panel 101.
  • the light-emitting surface 131 may have a matte surface treatment or a scattering point design to uniformize the light output of the light guide plate 130 and reduce the light unevenness (Mura). phenomenon.
  • the light-emitting surface 131 may be provided with a plurality of protruding structures (not shown) to further correct the direction of the light to increase the light collecting effect and improve the front luminance.
  • the protruding structures may be, for example, prismatic or semi-circular convex or concave structures.
  • the light reflecting surface 132 is formed on the other side of the light guiding plate 130 opposite to the light emitting surface 131 for reflecting light to the light emitting surface 131.
  • the light reflecting surface 132 of the light guide plate 130 is parallel to the light emitting surface 131.
  • the light reflecting surface 132 may be provided with a light guiding structure (not shown) for reflecting the guiding light to be emitted from the light emitting surface 131.
  • the light guiding structure of the light reflecting surface 132 is, for example, a continuous V-shaped structure, that is, a V-Cut structure, a matte structure, and a scattering point structure, so that the light transmitted by the guiding optical fiber 111 is sufficiently emitted from the light emitting surface 131.
  • the side light incident surface 133 is formed on one side or opposite sides of the light guide plate 130, and faces the light exit opening 121 of the optical fiber light emitting substrate 120 for allowing the light transmitted by the optical fiber 111 to enter the light guide plate 130.
  • the side light incident surface 133 may have, for example, a V-shaped structure (V-Cut), an S-shaped wave structure, or a surface roughening treatment (not shown), thereby improving the incidence efficiency and optical coupling efficiency of the light.
  • FIG. 4 is a schematic diagram of an embodiment of an astigmatism concave portion of a light guide plate according to the present invention.
  • the astigmatism concave portion 134 of the light guide plate 130 is formed on the side light incident surface 133, and the opening (for example, the circular opening) of the astigmatism concave portion 134 is corresponding to the light exit opening 121 of the optical fiber light emitting substrate 120, so that the light exit opening 121 is The emitted light may enter the light guide plate 130 through the astigmatism recess 134.
  • the astigmatism concave portion 134 may be formed on the side light incident surface 133 of the light guide plate 130 by laser processing, injection molding, hot press, imprinting, or machining. Wherein, the inner side surface of the astigmatism concave portion 134 may be a smooth surface or a rough surface.
  • Each of the astigmatism recesses 134 has a first opening length L1 and a second opening length L2, wherein the first opening length L1 is greater than the second opening length L2.
  • the first opening length L1 is the maximum opening length of the astigmatism concave portion 134, for example, between 3 mm (mm) and 5 cm (cm), or between 3 Mm and 3 Between cm.
  • the first opening length L1 is parallel to the long axis direction of the astigmatism concave portion 134 and parallel to the long axis direction of the side light incident surface 133 of the light guide plate 130.
  • the second opening length L2 may be the shortest opening length of the astigmatism concave portion 134, and the second opening length L2 may be perpendicular to the first opening length L1, for example, between 3 Between mm and 2 cm, or between 3 mm and 1 cm.
  • each astigmatism concave portion 134 of the light guide plate 130 has an angle ⁇ with the side entrance light surface 133, and the angle ⁇ is greater than 90 degrees, for example, 105 degrees to 175 degrees.
  • the light emitted by the light exit opening 121 can be diffused by the astigmatism concave portion 134.
  • the light-emitting end of the optical fiber 111 is preferably at the maximum depth of the astigmatism concave portion 134 (that is, the lowest end of the astigmatism concave portion 134).
  • the astigmatism concave portion 134 of the light guide plate 130 can be used as a concave lens (concave) Lens) to laterally diffuse the light emitted by the light exit opening 121.
  • the light exiting end of the optical fiber 111 emits light
  • the light emitted from the light exit opening 121 through the astigmatism concave portion 134 of the light guide plate 130 can be laterally diffused and homogenized to achieve the effect of light mixing to shorten the light mixing of the light guide plate 130. Distance to achieve a narrow border effect.
  • the astigmatism concave portion 134 compared with the second opening length L2, since the astigmatism concave portion 134 has a long light diffusion length on the first opening length L1 (long axis direction), it has a preferable lateral diffusion effect. Therefore, by the astigmatism concave portions 134 having different lengths, the light transmitted from the optical fibers 111 can be laterally diffused to achieve the effect of mixing light, and the required light mixing distance of the light guide plate 130 can be shortened. The problem of uneven spots on the light incident side of the light guide plate 130 can be reduced.
  • a distance C between the light exit end of the optical fiber 111 and the side light incident surface 133 of the light guide plate 130 is used to ensure the lateral astigmatism effect of the astigmatism concave portion 134, and the distance C and the first opening are
  • the length L1 can satisfy the following formula:
  • the concentrator 140 of the present embodiment may be disposed outside the display device (for example, outdoors or indoors) and connected to one end of the optical fiber 111 for collecting external light such as sunlight.
  • the concentrator 140 may include a susceptor 141, an optical lens 142, a photosensor 143, and a housing 144.
  • the optical lens 142 and the light sensor 143 can be disposed on the base 141.
  • the optical lens 142 is configured to collect external light and provide the collected light to the light incident end 116 of the optical fiber 111.
  • the light sensor 143 can be used to sense light to control the base 141 to rotate corresponding to an external light source such as the sun, thereby improving light collection efficiency.
  • the cover 144 is for covering the optical lens 142 and the photosensor 143, and the cover 144 may have an ultraviolet filter layer (not shown) to filter the ultraviolet rays in the light.
  • the back plate 150 is made of an opaque material, such as a plastic material, a metal material, or a combination of the above materials, for carrying the optical fiber light emitting substrate 120 and the light guide plate 130 .
  • the reflective layer 160 (or the reflective sheet) preferably forms the surface of the light reflecting surface 132 of the light guide plate 130, and exposes only the side entrance light surface 133 for allowing light to enter and the light exit surface 131 for emitting light.
  • the reflective layer 160 may be made of a high reflectivity material such as silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination of the above, resistant A yellowish, heat-resistant white reflective paint or any combination of the above materials to reflect light.
  • a high reflectivity material such as silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, an alloy of any combination of the above, resistant A yellowish, heat-resistant white reflective paint or any combination of the above materials to reflect light.
  • the optical film 170 is, for example, a diffusion sheet, a prism sheet, and a reverse prism sheet (Turning) Prism Sheet), Brightness Enhancement Film (BEF), Reflective Brightness Enhancement Film (Dual Brightness) Enhancement Film, DBEF), non-multilayer film reflective polarizer (Diffused Reflective Polarizer) Film, DRPF, or any combination thereof, is disposed on the light guide plate 130 to improve the optical effect of the light emitted from the light guide plate 130.
  • BEF Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DBEF Reflective Brightness Enhancement Film
  • DRPF non-multilayer film reflective polarizer
  • the optical fiber 111 can transmit external light (such as sunlight) collected by the concentrator 140 to the light guide plate 130. More specifically, the light collected by the concentrator 140 can be transmitted through the optical fiber 111 and emitted to the light guide plate 130 through the light exit 121 of the optical fiber output substrate 120. Since the backlight module 100 uses external light as a side light source, the power consumption of the light source can be greatly reduced. Moreover, the external light (such as sunlight) generally has a wider color gamut, so the display device using the backlight module 100 can provide an image with real color, which greatly improves the image display quality of the display device.
  • external light such as sunlight
  • the light transmitted from the optical fiber 111 can be laterally diffused through the astigmatism concave portion 134 of the light guide plate 130 to achieve the effect of mixing light and shortening the light mixing distance.
  • the problem of uneven spot on the light incident side of the light guide plate 130 can be reduced.
  • the optical fiber light emitting substrate 120 may further include a plurality of light sources 122, such as light emitting diodes (LEDs) or organic light emitting diodes (Organic). Light Emitting Diode, OLED).
  • the light source 122 can be arranged between the light exit ports 121 and face the light incident surface 133 of the light guide plate 130. When the light collected by the concentrator 140 is insufficient to provide a surface light source, the light source 122 can provide additional light to the light guide plate 130 to ensure that the backlight formed by the backlight module 100 has sufficient brightness.
  • the light source 122 may be located between the astigmatism concave portions 134 of the light guide plate 130, and each of the light sources 122 and the adjacent astigmatism concave portions 134 may preferably have a preset gap S to effectively mix the light and the light source transmitted by the optical fiber 111. 122 light.
  • the backlight module and the display device of the present invention can collect external light to form a backlight, thereby greatly reducing the power consumption of the light source, and improving the image color performance of the display device to improve the image display quality of the display device.
  • the light transmitted from the optical fiber can be laterally diffused through the astigmatism concave portion of the light guide plate to achieve the effect of mixing light and shortening the light mixing distance. The problem of uneven spot on the light incident side of the light guide plate can be reduced.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

一种背光模块（100）及显示装置，该显示装置包括此背光模块（100）和显示面板。此背光模块（100）包括集光器（140）、光纤（111）、光纤出光基板（120）及导光板（130）。光纤（111）连接于集光器（140）与光纤出光基板（120）之间，导光板（130）设置于光纤出光基板（120）的一侧。导光板（130）包括多个散光凹部（134），散光凹部（134）面对于光纤出光基板（120）的出光口（121）。该显示装置可利用外界光线来形成背光源，并通过导光板（130）的散光凹部（134）来混光。

Description

背光模块及显示装置 技术领域
本发明涉及一种背光模块及显示装置，特别是涉及一种使用外界光线的背光模块及显示装置。
 背景技术
液晶显示器(Liquid Crystal Display，LCD)已被广泛应用于各种电子产品中，液晶显示器大部分为背光型液晶显示器，其是由液晶显示面板及背光模块(backlight module)所组成。背光模块可依照光源入射位置的不同分成侧向式入光(Side-light type)与直下式入光(Direct-light type)两种，以便提供背光源至液晶显示面板。
一般，背光模块的光源为发光二极管(Light-Emitting Diode，LED)或冷阴极荧光灯管(Cold Cathode Fluorescent Lamp，CCFL)，其需通过荧光粉的混光来发出白光，因而具有较弱的色彩表现能力及较窄的色域，而难以提供影像的真实色彩。再者，背光模块的光源会耗费较多的电力，特别是用于大尺寸的液晶显示器。
故，有必要提供一种背光模块及显示装置，以解决现有技术所存在的问题。
 技术问题
本发明提供一种背光模块及显示装置，以解决背光模块的光源所存在的问题。
 技术解决方案
本发明的主要目的在于提供一种背光模块，所述背光模块包括：
集光器，用于收集外界光线；
多条光纤，连接于所述集光器；
光纤出光基板，连接于所述光纤，其中所述光纤出光基板具有多个出光口，用于发出由所述光纤所传来的光线；以及
导光板，设置于所述光纤出光基板的一侧，其中所述导光板包括多个散光凹部，所述散光凹部是面对于所述光纤出光基板的所述出光口，每一所述散光凹部具有第一开口长度及第二开口长度，所述第一开口长度大于所述第二开口长度。
本发明的另一目的在于提供一种背光模块，所述背光模块包括：
集光器，用于收集外界光线；
多条光纤，连接于所述集光器；
光纤出光基板，连接于所述光纤，其中所述光纤出光基板具有多个出光口，用于发出由所述光纤所传来的光线；以及
导光板，设置于所述光纤出光基板的一侧，其中所述导光板包括多个散光凹部，所述散光凹部是面对于所述光纤出光基板的所述出光口，每一所述散光凹部具有第一开口长度及第二开口长度，所述第一开口长度大于所述第二开口长度，所述第一开口长度是平行于所述散光凹部的长轴方向，且平行于所述导光板的侧入光面的长轴方向，所述第二开口长度垂直于所述第一开口长度。
本发明的又一目的在于提供一种显示装置，所述显示装置包括：
显示面板；以及
背光模块，包括：
集光器，用于收集外界光线；
多条光纤，连接于所述集光器；
光纤出光基板，连接于所述光纤，其中所述光纤出光基板具有多个出光口，用于发出由所述光纤所传来的光线；以及
导光板，设置于所述光纤出光基板的一侧，其中所述导光板包括多个散光凹部，所述散光凹部是面对于所述光纤出光基板的所述出光口，每一所述散光凹部具有第一开口长度及第二开口长度，所述第一开口长度大于所述第二开口长度。
在本发明的一实施例中，所述第一开口长度是平行于所述散光凹部的长轴方向，且平行于所述导光板的侧入光面的长轴方向。
在本发明的一实施例中，所述散光凹部的截面形状为圆弧形、三角形或多边形。
在本发明的一实施例中，所述第一开口长度是介于3公厘与5公分之间。
在本发明的一实施例中，所述第二开口长度垂直于所述第一开口长度。
在本发明的一实施例中，所述第二开口长度是介于3公厘与2公分之间。
在本发明的一实施例中，每一所述散光凹部与所述导光板的侧入光面之间具有一角度，所述角度大于90度。
在本发明的一实施例中，所述角度为105度~175度。
在本发明的一实施例中，所述光纤的出光端是对位于所述散光凹部的最大深度处。
 有益效果
相较于现有的背光模块的问题，本发明的背光模块和显示装置可有效地利用外界光线来形成背光源，因而可大幅地减少光源的电力耗费，且由于外界的光线一般可具有较宽的色域，故使用本发明背光模块的显示装置可提供具有真实色彩的影像，大幅地改善影像显示质量。又，由光纤所传来的光线可通过导光板的散光凹部来进行横向扩散，以达到混光的效果，缩短导光板的混光距离, 并可减少其入光侧的不均匀光斑问题。
 附图说明
图1为本发明显示装置的一实施例的示意图；
图2为本发明背光模块的一实施例的示意图；
图3为本发明光纤的一实施例的示意图；
图4为本发明导光板的散光凹部的一实施例的示意图；
图5A至图5C为本发明导光板的散光凹部的一实施例的上视图；以及
图6为本发明背光模块的另一实施例的示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
附图和说明被认为在本质上是示出性的，而不是限制性的。在图中，结构相似的单元是以相同标号表示。另外，为了理解和便于描述，附图中示出的每个组件的尺寸和厚度是任意示出的，但是本发明不限于此。
在附图中，为了清晰起见，夸大了层、膜、面板、区域等的厚度。在附图中，为了理解和便于描述，夸大了一些层和区域的厚度。将理解的是，当例如层、膜、区域或基底的组件被称作“在”另一组件“上”时，所述组件可以直接在所述另一组件上，或者也可以存在中间组件。
另外，在说明书中，除非明确地描述为相反的，否则词语“包括”将被理解为意指包括所述组件，但是不排除任何其它组件。此外，在说明书中，“在......上”意指位于目标组件上方或者下方，而不意指必须位于基于重力方向的顶部上。
请参照图1及图2，图1为本发明显示装置的一实施例的示意图，图2为本发明背光模块的一实施例的示意图。在本实施例中，背光模块100是相对于一显示面板101(例如液晶显示面板)来设置，而形成一显示装置(例如液晶显示装置)。背光模块100包括有多条光纤111、光纤出光基板120、导光板130、集光器140、背板150、反射层160及光学膜片170。光纤111是连接于集光器140与光纤出光基板120之间，用于传送光线。光纤出光基板120是设置于光纤111与导光板130之间，用于固定光纤111，并允许光纤111所传送的光线可进入导光板130。集光器140是连接于光纤111，用于收集外界光线，例如太阳光或室内光线，以提供光线至光纤111。导光板130可承载于背板150上，反射层160是形成于背板150与导光板130之间，用以反射光线。光学膜片170设置于导光板130上，以改善光学效果。
如图2所示，本实施例的多条光纤111可被一外皮所包覆，而形成光纤束110，以方便于连接于集光器140。光纤束110的一端是连接于集光器140，分离的光纤111是连接于光纤出光板120上。
请参照图3，其为本发明光纤的一实施例的示意图。本实施例的光纤111可具有光纤芯113、包层114及缓冲层115。光纤芯(core)113可由例如石英或PMMA所制成，用于传导光线。包层114是可由硬聚合物(hard polymer)所制成，用于包覆住光纤芯113。缓冲层115可由例如四氟乙烯所制成，用于避免光纤111受到损伤。
如图1及图2所示，本实施例的光纤出光基板120是设置于光纤111与导光板130之间，用于发出光纤111所传送的光线。光纤出光基板120具有多个出光口121，用于露出光纤111的出光端，使得光纤111所传送的光线可由光纤出光基板120的出光口121发出，并进入导光板130。其中，出光口121的排列间隔(pitch)可小于等于16毫米(mm)，以确保光线可分散地进入导光板130，而形成均匀的面光源。每一出光口121的直径(或宽度)可小于或等于2.5mm，使得光纤111所传送的光线可充分地由出光口121发出。
如图1所示，本实施例的导光板130是设置于光纤出光基板120的一侧。导光板130可利用射出成型(Injection Molding)的方式来制成，其材料为光硬化型树脂、聚甲基丙烯酸甲酯(PMMA)或聚碳酸酯(PC)，用以导引光纤111所传送的光线至液晶显示面板101。导光板130具有出光面131、光反射面132、侧入光面133及多个散光凹部134。出光面131形成于导光板130的一侧，并面对液晶显示面板101，出光面131可具有雾面处理或散射点设计，以便均匀化导光板130的出光，减少出光不均(Mura)的现象。在另一实施例中，出光面131更可设有若干个突出结构(未绘示)，以便进一步修正光线的方向，来增加聚光效果，并提高正面辉度。其中此些突出结构可例如为：棱形或半圆形的凸起或凹陷结构等。光反射面132是形成导光板130相对出光面131的另一侧，用以反射光线至出光面131。在本实施例中，导光板130的光反射面132平行于出光面131。光反射面132可设有导光结构(未绘示)，以反射导引光线由出光面131射出。光反射面132的导光结构例如是呈连续性的V形结构，亦即V-Cut结构、雾面结构、散射点结构，以便导引光纤111所传送的光线充分的由出光面131射出。侧入光面133形成于导光板130的一侧或相对两侧，其面对于光纤出光基板120的出光口121，用以允许光纤111所传送的光线可进入导光板130内。且此侧入光面133可具有例如V形结构(V-Cut)、S形波浪结构或表面粗糙化处理(未绘示)，以此提升光线的入射效率和光耦合效率。
请参照图2及图4，图4为本发明导光板的散光凹部的一实施例的示意图。导光板130的散光凹部134是形成于侧入光面133上，且散光凹部134的开口(例如楕圆形开口)是分别对应地面对于光纤出光基板120的出光口121，使得由出光口121所发出的光线可经过散光凹部134来进入导光板130内。散光凹部134可通过激光加工、注塑成型(Injection)、热压成型(Hotpress)、压印(Imprinting)或机械加工来形成于导光板130的侧入光面133上。其中，散光凹部134的内侧表面可为光滑表面或粗糙表面。每一散光凹部134具有第一开口长度L1及第二开口长度L2，其中第一开口长度L1是大于第二开口长度L2。第一开口长度L1为散光凹部134的最大开口长度，例如介于3公厘(mm)与5公分(cm)之间，或介于3 mm与3 cm之间。第一开口长度L1是平行于散光凹部134的长轴方向，且平行于导光板130的侧入光面133的长轴方向。第二开口长度L2可为散光凹部134的最短开口长度，第二开口长度L2可垂直于第一开口长度L1，例如介于3 mm与2 cm之间，或介于3 mm与1 cm之间。
请参照图5A至图5C，其为本发明导光板的散光凹部的一实施例的上视图。散光凹部134的截面形状可为圆弧形(如图5A所示)、三角形(如图5B所示)或多边形(如图5C所示)。在散光凹部134的第一开口长度L1方向上，导光板130的每一散光凹部134与侧入光面133之间具有一角度θ，此角度θ大于90度，例如为105度~175度，使得由出光口121所发出的光线可被散光凹部134所扩散。且为确保散光凹部134的光扩散效果，光纤111的出光端优选是对位于散光凹部134的最大深度处(亦即散光凹部134的最底端)。
如图2所示，导光板130的散光凹部134可作为凹透镜(concave lens)，以横向扩散由出光口121所发出的光线。当光纤111的出光端发出光线时，通过导光板130的散光凹部134，由出光口121所发出的光线可被横向扩散且均匀化，而达到混光的效果，以缩短导光板130的混光距离，而达到窄边框效果。其中，相较于第二开口长度L2，由于散光凹部134在第一开口长度L1上(长轴方向上)具有较长的光扩散长度，因而具有较佳的侧向扩散效果。因此，通过具有不同长度的散光凹部134，可横向扩散由光纤111所传来的光线，以达到混光的效果，缩短导光板130所需的混光距离, 并可减少导光板130入光侧的不均匀光斑(hotspot)问题。
如图2所示，在本实施例中，光纤111的出光端与导光板130的侧入光面133之间具有距离C，为确保散光凹部134的横向散光效果，此距离C与第一开口长度L1可满足如下公式：
L1≥2C。
如图2所示，本实施例的集光器140可设置于显示装置的外部(例如户外或室内)，并连接于光纤111的一端，用于收集外界光线，例如太阳光。集光器140可包括基座141、光学透镜142、光传感器143及外罩144。光学透镜142及光传感器143可设置于基座141上，光学透镜142用于收集外界光线，并提供所收集的光线于光纤111的入光端116。光传感器143可用于感测光线，以控制基座141对应于外界光源(如太阳)来转动，而提高光收集效率。外罩144是用于包覆光学透镜142及光传感器143，且外罩144可具有紫外线过滤层(未显示)，以过滤光线中的紫外线。
如图1所示，在本实施例中，背板150是由不透光材质所制成，例如：塑胶材料、金属材料或上述材料的组合，用于承载光纤出光基板120及导光板130。反射层160(或反射片)优选可形成导光板130的光反射面132的表面，而仅暴露出用以允许光线进入的侧入光面133以及用以发出光线的出光面131。反射层160可由高反射率材料所制成，例如银、铝、金、铬、铜、铟、铱、镍、铂、铼、铑、锡、钽、钨、锰、上述任意组合的合金、耐黄化且耐热的白色反射漆料或上述材料的任意组合，以反射光线。光学膜片170例如为：扩散片、棱镜片、逆棱镜片(Turning Prism Sheet)、增亮膜(Brightness Enhancement Film，BEF)、反射式增亮膜(Dual Brightness Enhancement Film，DBEF)、非多层膜式反射偏光片(Diffused Reflective Polarizer Film，DRPF)或上述的任意组合，其设置于导光板130上，用以改善由导光板130出光的光学效果。
当使用本实施例背光模块来提供背光源时，光纤111可将集光器140所收集的外界光线(如太阳光)传送至导光板130。更具体地，集光器140所收集的光线可经由光纤111来进行传送，并通过光纤出光基板120的出光口121来发出至导光板130。由于背光模块100是使用外部的光线来作为侧光源，因而可大幅地减少光源的电力耗费。且外界的光线(如太阳光)一般可具有较宽的色域，故使用背光模块100的显示装置可提供具有真实色彩的影像，大幅地改善显示装置的影像显示质量。又，由光纤111所传来的光线可通过导光板130的散光凹部134来进行横向扩散，以达到混光的效果，缩短混光距离, 并可减少导光板130入光侧的不均匀光斑问题。
请参照图6，其为本发明背光模块的另一实施例的示意图。在另一实施例中，光纤出光基板120更可包括多个光源122，例如为发光二极管(LED)或有机发光二极管(Organic Light Emitting Diode，OLED)。光源122可排列于出光口121之间，并面对于导光板130的侧入光面133。当集光器140所收集的光线不足以提供来形成面光源时，光源122可提供额外的光线于导光板130，以确保背光模块100所形成的背光源具有足够的亮度。此时，光源122可对位于导光板130的散光凹部134之间，每一光源122与相邻散光凹部134之间优选可具有预设间隙S，以有效地混合光纤111所传送的光线与光源122的光线。
由上述可知，本发明的背光模块和显示装置可收集外界光线来形成背光源，因而可大幅地减少光源的电力耗费，且可改善显示装置的影像色彩表现，以改善显示装置的影像显示质量。由光纤所传来的光线可通过导光板的散光凹部来进行横向扩散，以达到混光的效果，缩短混光距离, 并可减少导光板入光侧的不均匀光斑问题。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
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Claims (17)

  1. 一种背光模块，其特征在于：所述背光模块包括：
    集光器，用于收集外界光线；
    多条光纤，连接于所述集光器；
    光纤出光基板，连接于所述光纤，其中所述光纤出光基板具有多个出光口，用于发出由所述光纤所传来的光线；以及
    导光板，设置于所述光纤出光基板的一侧，其中所述导光板包括多个散光凹部，所述散光凹部是面对于所述光纤出光基板的所述出光口，每一所述散光凹部具有第一开口长度及第二开口长度，所述第一开口长度大于所述第二开口长度，所述第一开口长度是平行于所述散光凹部的长轴方向，且平行于所述导光板的侧入光面的长轴方向，所述第二开口长度垂直于所述第一开口长度。
  2. 根据权利要求1所述的背光模块，其中所述散光凹部的截面形状为圆弧形、三角形或多边形。
  3. 根据权利要求1所述的背光模块，其中所述第一开口长度是介于3公厘与5公分之间。
  4. 根据权利要求1所述的背光模块，其中所述第二开口长度是介于3公厘与2公分之间。
  5. 根据权利要求1所述的背光模块，其中每一所述散光凹部与所述导光板的侧入光面之间具有一角度，所述角度大于90度。
  6. 根据权利要求5所述的背光模块，其中所述角度为105度~175度。
  7. 根据权利要求1所述的背光模块，其中所述光纤的出光端是对位于所述散光凹部的最大深度处。
  8. 一种背光模块，包括：
    集光器，用于收集外界光线；
    多条光纤，连接于所述集光器；
    光纤出光基板，连接于所述光纤，其中所述光纤出光基板具有多个出光口，用于发出由所述光纤所传来的光线；以及
    导光板，设置于所述光纤出光基板的一侧，其中所述导光板包括多个散光凹部，所述散光凹部是面对于所述光纤出光基板的所述出光口，每一所述散光凹部具有第一开口长度及第二开口长度，所述第一开口长度大于所述第二开口长度。
  9. 根据权利要求8所述的背光模块，其中所述第一开口长度是平行于所述散光凹部的长轴方向，且平行于所述导光板的侧入光面的长轴方向。
  10. 根据权利要求8所述的背光模块，其中所述散光凹部的截面形状为圆弧形、三角形或多边形。
  11. 根据权利要求8所述的背光模块，其中所述第一开口长度是介于3公厘与5公分之间。
  12. 根据权利要求8所述的背光模块，其中所述第二开口长度垂直于所述第一开口长度。
  13. 根据权利要求8所述的背光模块，其中所述第二开口长度是介于3公厘与2公分之间。
  14. 根据权利要求8所述的背光模块，其中每一所述散光凹部与所述导光板的侧入光面之间具有一角度，所述角度大于90度。
  15. 根据权利要求14所述的背光模块，其中所述角度为105度~175度。
  16. 根据权利要求8所述的背光模块，其中所述光纤的出光端是对位于所述散光凹部的最大深度处。
  17. 一种显示装置，包括：
    显示面板；以及
    背光模块，包括：
    集光器，用于收集外界光线；
    多条光纤，连接于所述集光器；
    光纤出光基板，连接于所述光纤，其中所述光纤出光基板具有多个出光口，用于发出由所述光纤所传来的光线；以及
    导光板，设置于所述光纤出光基板的一侧，其中所述导光板包括多个散光凹部，所述散光凹部是面对于所述光纤出光基板的所述出光口，每一所述散光凹部具有第一开口长度及第二开口长度，所述第一开口长度大于所述第二开口长度。
PCT/CN2012/085117 2012-11-05 2012-11-23 背光模块及显示装置 WO2014067195A1 (zh)

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