WO2014067196A1 - 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
WO2014067196A1
WO2014067196A1 PCT/CN2012/085144 CN2012085144W WO2014067196A1 WO 2014067196 A1 WO2014067196 A1 WO 2014067196A1 CN 2012085144 W CN2012085144 W CN 2012085144W WO 2014067196 A1 WO2014067196 A1 WO 2014067196A1
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WO
WIPO (PCT)
Prior art keywords
light
backlight module
optical fiber
light source
emitting
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2012/085144
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English (en)
French (fr)
Inventor
陈仕祥
陈立宜
李德华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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 Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US13/805,496 priority Critical patent/US9116273B2/en
Priority to DE112012007093.3T priority patent/DE112012007093B4/de
Publication of WO2014067196A1 publication Critical patent/WO2014067196A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • G02B6/0023—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
    • G02B6/0011—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
    • 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
    • G02F1/133618—Illuminating devices for ambient light

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:
  • optical fiber illuminating plate is connected to the optical fiber, wherein the optical fiber illuminating plate comprises a plurality of light exit ports and a plurality of light sources, wherein the light exit ports are used for emitting light transmitted by the optical fibers;
  • the light guide plate is disposed on one side of the optical fiber light-emitting board.
  • Another object of the present invention is to provide a backlight module, the backlight module comprising:
  • optical fiber illuminating plate is connected to the optical fiber, wherein the optical fiber illuminating plate comprises a plurality of light exit ports and a plurality of light sources, wherein the light exit ports are used for emitting light transmitted by the optical fibers;
  • a light guide plate disposed on one side of the optical fiber light-emitting board
  • a light intensity sensor wherein the light intensity sensor transmits a sensing signal to a processor of the backlight module, and the processor controls illumination of the light source according to the sensing signal, the processor according to the sense The signal is measured to adjust the current of the light source to control the light intensity of the light source.
  • the light intensity sensed by the light intensity sensor is higher than a preset threshold, the light source is in a closed state.
  • the backlight module includes:
  • optical fiber illuminating plate is connected to the optical fiber, wherein the optical fiber illuminating plate comprises a plurality of light exit ports and a plurality of light sources, wherein the light exit ports are used for emitting light transmitted by the optical fibers;
  • the light guide plate is disposed on one side of the optical fiber light-emitting board.
  • the light source is a light emitting diode or an organic light emitting diode.
  • the backlight module further includes a light intensity sensor, wherein the light intensity sensor transmits a sensing signal to a processor of the backlight module, and the processor controls according to the sensing signal.
  • the illumination of the light source is not limited to a light intensity sensor, wherein the light intensity sensor transmits a sensing signal to a processor of the backlight module, and the processor controls according to the sensing signal. The illumination of the light source.
  • the processor adjusts the current of the light source according to the sensing signal to control the luminous intensity of the light source.
  • the light source when the light intensity sensed by the light intensity sensor is higher than a predetermined threshold, the light source is in a closed state.
  • the light source is located between the light exits.
  • the light source when the light intensity emitted by the light exit port is lower than a preset threshold, the light source is in an open state.
  • the backlight module further includes a plurality of fixing collars respectively disposed on the light-emitting ends of the optical fibers for fixing the optical fibers on the optical fiber light-emitting board.
  • the fixing collar includes a plurality of hooks
  • the optical fiber light-emitting board further has a fixed through hole for correspondingly engaging the hook of the fixing collar.
  • 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 source on the fiber exit plate can emit light to compensate for the brightness to ensure that the backlight of the backlight module has sufficient brightness.
  • the light-emitting end of the optical fiber can be accurately positioned and fixed on the optical fiber exit plate to ensure high optical energy utilization of the optical fiber.
  • 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 of an embodiment of an optical fiber light-emitting board and an optical fiber according to the present invention
  • FIG. 5 is a partial enlarged view of an embodiment of a backlight module of the present invention.
  • FIG. 6 is a control block diagram of an embodiment of a light intensity sensor and a processor of the present invention.
  • FIG. 7 and FIG. 8 are schematic diagrams showing the combination of an embodiment of a fixing collar and an optical fiber according to the present invention.
  • FIG. 9 , FIG. 10 and FIG. 11 are schematic diagrams showing a combination of an embodiment of a fixing collar and an optical fiber exiting plate according to the present invention.
  • FIG. 12 and FIG. 13 are schematic diagrams showing the combination of an embodiment of a fixing collar and an optical fiber exiting plate according to 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 plate 120, a light guide plate 130, a light collector 140, a back plate 150, a reflective layer 160, an optical film 170, and a plurality of fixed collars 180.
  • the optical fiber 111 is connected to the concentrator 140 for transmitting light.
  • the optical fiber illuminating plate 120 is disposed between the optical fiber 111 and the light guide plate 130 for providing light transmitted by the optical fiber 111 or light from the light source 122 to 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 fixing collars 180 are respectively disposed on the light-emitting ends 112 of the optical fibers 111 for fixing the optical fibers 111 on the optical fiber-emitting board 120.
  • 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.
  • FIG. 4 is a schematic diagram of an embodiment of an optical fiber light-emitting board and an optical fiber according to the present invention
  • FIG. 5 is a partially enlarged view of an embodiment of the backlight module of the present invention.
  • the optical fiber light-emitting board 120 of the present embodiment is disposed between the optical fiber bundle 110 and the light guide plate 130.
  • the substrate of the optical fiber light-emitting board 120 can be a circuit board, and includes a plurality of light-emitting ports 121 and a plurality of light sources 122, and the light-emitting ports 121 and The light sources 122 are disposed on the side light incident surface 133 of the light guide plate 130 for providing light to the light guide plate 130.
  • the light exiting opening 121 can be a through hole for exposing the light emitting end 112 of the optical fiber 111, so that the light transmitted by the optical fiber 111 can be emitted from the light exiting opening 121 of the optical fiber light emitting plate 120 and enter the light guiding 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 source 122 can be, for example, a light emitting diode (LED) or an organic light emitting diode (Organic Light). Emitting Diode, OLED), and located between the light exits 121.
  • LED light emitting diode
  • OLED Organic Light emitting diode
  • the light source 122 on the fiber illuminating plate 120 can emit light to provide additional light to the light guide plate 130, ensuring that the backlight formed by the backlight module 100 has sufficient backlight. Brightness.
  • the light source 122 on the optical fiber light emitting plate 120 is turned on to compensate the brightness of the backlight module 100 by light emission.
  • the backlight module 100 may further include a light intensity sensor 191 for sensing light intensity.
  • the light intensity sensor 191 can be disposed inside the backlight module 100, such as on the fiber exit plate 120 or in the back plate 150.
  • the light source 122 is turned off without emitting light to save energy.
  • the light intensity sensor 191 can transmit the sensing signal to the processor 192 of the backlight module 100. Then, the processor 192 can control the illumination of the light source 122 according to the sensing signal to compensate the brightness of the backlight module 100.
  • the processor 192 can adjust the current of the light source 122 (eg, LED) according to the sensing signal to control the light intensity of the light source 122, so that the light guide plate 130 can form a surface light source with stable brightness.
  • the light guide plate 130 of the present embodiment is disposed on one side of the optical fiber exit plate 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.
  • injection Molding injection molding
  • the light guide plate 130 has a light emitting surface 131, a light reflecting surface 132, and a side light incident surface 133.
  • 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 exit plate 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.
  • 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 fiber bundle 110 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 fiber bundle 110.
  • 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 board 120 and the light guide plate 130.
  • the backplane 150 can have corresponding through holes (not shown) to allow the optical fibers 110 to pass through.
  • 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
  • FIG. 7 and FIG. 8 are schematic diagrams showing a combination of an embodiment of a fixing collar and an optical fiber according to the present invention.
  • the retaining collar 180 of the present embodiment may be made of a plastic or metal material, preferably made of a soft material such as a silicone or rubber material to avoid scratching or damaging the optical fiber 111.
  • the fixing collar 180 includes a through hole 181, a joint surface 182, and an extension portion 183.
  • the optical fiber 111 can be inserted into the through hole 181 of the fixing collar 180 and expose the light emitting end 112 of the optical fiber 111.
  • the bonding surface 182 is for bonding to the surface of the optical fiber luminescent panel 120 such that the fixing collar 180 can be fixed to the optical fiber luminescent panel 120.
  • the through hole 181 may be formed in the extending portion 183, and the extending portion 183 may be in a cylindrical shape for supporting a portion of the optical fiber 111 adjacent to the light emitting end 112 to ensure that a portion of the optical fiber 111 adjacent to the light emitting end 112 is bent to ensure the optical fiber 111. Transmission efficiency.
  • FIG. 9 , FIG. 10 and FIG. 11 are schematic diagrams showing the combination of an embodiment of a fixing collar and a fiber exiting plate.
  • the optical fiber 111 and the optical fiber light emitting plate 120 are combined by the fixed collar 180, first, the optical fiber 111 is inserted into the through hole 181 of the fixing collar 180, and the light emitting end 112 of the optical fiber 111 is exposed.
  • each fiber 111 can have a marking line 117 to indicate the location of the optical end 112.
  • the marking line 117 of the optical fiber 111 can be aligned with the edge of the through hole 181 to accurately position the optical end 112 on the fixed collar 180.
  • the optical fiber 111 and the fixed collar 180 can be fixed by, for example, an adhesive. Then, after the optical fiber 111 is combined with the fixed collar 180, the exposed light-emitting end 112 is correspondingly inserted into the light-emitting port 121 of the optical fiber light-emitting board 120, and the bonding surface 182 of the fixed collar 180 can be bonded to the optical fiber by soldering or bonding.
  • the surface of the light-emitting plate 120 is fixed and positioned on the fiber-optic light-emitting plate 120.
  • the bonding surface 182 of the fixing collar 180 can also be coupled to the backing plate 150, as shown in FIG. At this time, the light-emitting end 112 of the optical fiber 111 can pass through the through hole 181 of the fixed collar 180, the corresponding through hole (not shown) of the back plate 150, and the light exit opening 121 of the optical fiber exit plate 120.
  • 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 port 121 of the optical fiber exit plate 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 source 122 on the optical fiber exit plate 120 can emit light to compensate for the brightness, so that the backlight module 100 can provide a backlight with stable brightness.
  • the collar 180 by fixing the collar 180, the light-emitting end 112 of the optical fiber 111 can be accurately positioned and fixed on the optical fiber light-emitting board 120, ensuring high optical energy utilization of the optical fiber 111.
  • FIG. 12 and FIG. 13 are schematic diagrams showing another embodiment of the fixing collar and the optical fiber light-emitting board of the present invention.
  • the fixing collar 180 can include a plurality of hooks 184, and the fiber exiting plate 120 further has a fixing through hole 123 for correspondingly engaging the hook 184 of the fixing collar 180. Therefore, the fixing collar 180 can be directly fixed to the optical fiber exiting plate 120 by the hook of the hook 184 and the fixing through hole 123 without using welding or pasting.
  • 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 source on the fiber exit plate can emit light to compensate for the brightness to ensure that the backlight of the backlight module has sufficient brightness.
  • the light-emitting end of the optical fiber can be accurately positioned and fixed on the optical fiber exit plate to ensure high optical energy utilization of the optical fiber.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

一种背光模块（100）及显示装置。显示装置包括背光模块（100）和显示面板（101）。背光模块（100）包括集光器（140）、光纤（111）、光纤出光板（120）及导光板（130）。光纤（111）连接于集光器（140）与光纤出光板（120）之间，导光板（130）设置于光纤出光板（120）的一侧，光纤出光板（120）包括多个出光口（121）及多个光源（122）。从而可利用外界光线来形成背光源。

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；
光纤出光板，连接于所述光纤，其中所述光纤出光板包括多个出光口及多个光源，所述出光口是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板的一侧。
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；
光纤出光板，连接于所述光纤，其中所述光纤出光板包括多个出光口及多个光源，所述出光口是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板的一侧；以及
光强传感器，所述光强传感器传送一感测信号至所述背光模组的处理器，所述处理器依据所述感测信号来控制所述光源的发光，所述处理器依据所述感测信号来调节所述光源的电流，以控制所述光源的发光强度，当所述光强传感器所感测的光强度高于一预设门坎值时，所述光源为关闭状态。
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；
光纤出光板，连接于所述光纤，其中所述光纤出光板包括多个出光口及多个光源，所述出光口是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板的一侧。
在本发明的一实施例中，所述光源为发光二极管或有机发光二极管。
在本发明的一实施例中，背光模块还包括一光强传感器，所述光强传感器传送一感测信号至所述背光模组的处理器，所述处理器依据所述感测信号来控制所述光源的发光。
在本发明的一实施例中，所述处理器依据所述感测信号来调节所述光源的电流，以控制所述光源的发光强度。
在本发明的一实施例中，当所述光强传感器所感测的光强度高于一预设门坎值时，所述光源为关闭状态。
在本发明的一实施例中，所述光源是位于所述出光口之间。
在本发明的一实施例中，当所述出光口所发出的光强度低于一预设门坎值时，所述光源为开启状态。
在本发明的一实施例中，背光模块还包括多个固定套环，分别套置于所述光纤的出光端上，用于固定所述光纤于所述光纤出光板上。
在本发明的一实施例中，所述固定套环包括多个卡钩，所述光纤出光板更具有固定通孔，用于对应卡合所述固定套环的卡钩。
 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。当外部光线不足时，光纤出光板上的光源可发光来补偿亮度，以确保背光模块的背光源具有充足的亮度。又，通过固定套环，光纤的出光端可精确地定位及固定于光纤出光板上，以确保光纤的高光能利用率。
 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为本发明光纤出光板与光纤的一实施例的示意图；
图5为本发明背光模块的一实施例的部分放大图；
图6为本发明光强传感器与处理器的一实施例的控制方块图；
图7及图8为本发明固定套环与光纤的一实施例的组合示意图；
图9、图10及图11为本发明固定套环与光纤出光板的一实施例的组合示意图；
图12及图13为本发明固定套环与光纤出光板的一实施例的组合示意图。
 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、光纤出光板120、导光板130、集光器140、背板150、反射层160、光学膜片170及多个固定套环180。光纤111是连接于集光器140，用于传送光线。光纤出光板120是设置于光纤111与导光板130之间，用于提供光纤111所传送的光线或光源122的光线至导光板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。固定套环180是分别套置于光纤111的出光端112上，用于固定光纤111于光纤出光板120上。
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。
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。
请参照图4及图5，图4为本发明光纤出光板与光纤的一实施例的示意图，图5为本发明背光模块的一实施例的部分放大图。本实施例的光纤出光板120是设置于光纤束110与导光板130之间，光纤出光板120的基板可为电路板，其包括多个出光口121及多个光源122，出光口121及多个光源122是面对于导光板130的侧入光面133来设置，用于提供光线至导光板130。出光口121可为通孔，用于露出光纤111的出光端112，使得光纤111所传送的光线可由光纤出光板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。
在本实施例中，光源122可例如为发光二极管(LED)或有机发光二极管(Organic Light Emitting Diode，OLED)，且位于出光口121之间。当集光器140所收集的光线不足以提供来形成面光源时，光纤出光板120上的光源122可发光，以提供额外的光线于导光板130，确保背光模块100所形成的背光源具有足够的亮度。更具体地，当光纤出光板120的出光口121所发出的光强度低于一预设门坎值时，光纤出光板120上的光源122为开启状态，以发光来补偿背光模块100亮度。
请参照图6，其为本发明光强传感器与处理器的一实施例的控制方块图。背光模块100可更包括一光强传感器191，用于感测光强度。光强传感器191可设置于背光模组100的内部，例如光纤出光板120上或背板150内。当光纤111所传送的光线的光强度充足时(例如当光强传感器所感测的光强度高于预设门坎值时)，光源122为关闭状态，而不发光，以节省能量。当光纤111所传送的光线的光强不足时(例如当光强传感器所感测的光强度低于预设门坎值时)，光强传感器191可传送感测信号至背光模组100的处理器192，接着，处理器192可依据感测信号来控制光源122的发光，以补偿背光模组100的亮度。且处理器192可依据感测信号来调节光源122(例如LED)的电流，以控制光源122的发光强度，使得导光板130可形成具稳定亮度的面光源。
如图1所示，本实施例的导光板130是设置于光纤出光板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及侧入光面133。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。
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)，并连接于光纤束110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束110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，用于承载光纤出光板120及导光板130，其中背板150可具有对应通孔(未显示)，以允许光纤110穿过。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。
请参照图7及图8，其为本发明固定套环与光纤的一实施例的组合示意图。本实施例的固定套环180可由塑胶或金属材料所制成，优选地，可由软性材料所制成，例如硅胶或橡胶材料，避免刮伤或损害光纤111。固定套环180包括通孔181、结合面182及延伸部183。光纤111可插置于固定套环180的通孔181内，并露出光纤111的出光端112。结合面182是用于结合于光纤出光板120的表面上，使得固定套环180可固定于光纤出光板120上。通孔181可形成于延伸部183内，延伸部183可呈筒状，用于支撑靠近出光端112的部分光纤111，以确保靠近出光端112的部分光纤111被弯折，以确保光纤111的传输效率。
请参照图7至图11，图9、图10及图11为本发明固定套环与光纤出光板的一实施例的组合示意图。当利用固定套环180来组合光纤111及光纤出光板120时，首先，将光纤111插入固定套环180的通孔181内，并露出光纤111的出光端112。此时，每一光纤111可具有标记线117，以标示出光端112的位置。当露出光纤111的出光端112时，光纤111的标记线117可对准于通孔181的孔缘，以准确地定位出光端112在固定套环180上的位置。其中，光纤111与固定套环180之间可利用例如黏着剂来进行固定。接着，在光纤111组合于固定套环180之后，将露出的出光端112对应地插入光纤出光板120的出光口121，并可将固定套环180的结合面182通过焊接或粘贴来结合于光纤出光板120的表面上，因而完成光纤111在光纤出光板120上的固定及定位。
值得注意的是，固定套环180的结合面182亦可结合于背板150，如图5所示。此时，光纤111的出光端112可穿过固定套环180的通孔181、背板150的对应通孔(未显示)及光纤出光板120的出光口121。
当使用背光模块100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。且当外部的光线不足时，光纤出光板120上的光源122可发光来补偿亮度，故背光模块100可提供具稳定亮度的背光源。再者，通过固定套环180，光纤111的出光端112可精确地定位及固定于光纤出光板120上，确保光纤111的高光能利用率。
请参照图12及图13，其为本发明固定套环与光纤出光板的另一实施例的组合示意图。在另一实施例中，固定套环180可包括多个卡钩184，且光纤出光板120更具有固定通孔123，用于对应卡合固定套环180的卡钩184。因此，通过卡钩184与固定通孔123的卡掣，固定套环180可直接固定于光纤出光板120上，而不需利用焊接或粘贴的方式。
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。当外部光线不足时，光纤出光板上的光源可发光来补偿亮度，以确保背光模块的背光源具有充足的亮度。又，通过固定套环，光纤的出光端可精确地定位及固定于光纤出光板上，以确保光纤的高光能利用率。
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 (20)

  1. 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；
    光纤出光板，连接于所述光纤，其中所述光纤出光板包括多个出光口及多个光源，所述出光口是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板的一侧；以及
    光强传感器，所述光强传感器传送一感测信号至所述背光模组的处理器，所述处理器依据所述感测信号来控制所述光源的发光，所述处理器依据所述感测信号来调节所述光源的电流，以控制所述光源的发光强度，当所述光强传感器所感测的光强度高于一预设门坎值时，所述光源为关闭状态。
  2. 根据权利要求1所述的背光模块，其中所述光源为发光二极管或有机发光二极管。
  3. 根据权利要求1所述的背光模块，其中所述光源是位于所述出光口之间。
  4. 根据权利要求1所述的背光模块，其中当所述出光口所发出的光强度低于一预设门坎值时，所述光源为开启状态。
  5. 根据权利要求1所述的背光模块，还包括多个固定套环，分别套置于所述光纤的出光端上，用于固定所述光纤于所述光纤出光板上。
  6. 根据权利要求5所述的背光模块，其中所述固定套环包括多个卡钩，所述光纤出光板更具有固定通孔，用于对应卡合所述固定套环的卡钩。
  7. 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；
    光纤出光板，连接于所述光纤，其中所述光纤出光板包括多个出光口及多个光源，所述出光口是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板的一侧。
  8. 根据权利要求7所述的背光模块，其中所述光源为发光二极管或有机发光二极管。
  9. 根据权利要求7所述的背光模块，还包括一光强传感器，所述光强传感器传送一感测信号至所述背光模组的处理器，所述处理器依据所述感测信号来控制所述光源的发光。
  10. 根据权利要求9所述的背光模块，其中所述处理器依据所述感测信号来调节所述光源的电流，以控制所述光源的发光强度。
  11. 根据权利要求9所述的背光模块，其中当所述光强传感器所感测的光强度高于一预设门坎值时，所述光源为关闭状态。
  12. 根据权利要求7所述的背光模块，其中所述光源是位于所述出光口之间。
  13. 根据权利要求7所述的背光模块，其中当所述出光口所发出的光强度低于一预设门坎值时，所述光源为开启状态。
  14. 根据权利要求7所述的背光模块，还包括多个固定套环，分别套置于所述光纤的出光端上，用于固定所述光纤于所述光纤出光板上。
  15. 根据权利要求14所述的背光模块，其中所述固定套环包括多个卡钩，所述光纤出光板更具有固定通孔，用于对应卡合所述固定套环的卡钩。
  16. 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；
    光纤出光板，连接于所述光纤，其中所述光纤出光板包括多个出光口及多个光源，所述出光口是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板的一侧。
  17. 根据权利要求16所述的显示装置，其中所述光源为发光二极管或有机发光二极管。
  18. 根据权利要求16所述的显示装置，其中所述背光模块还包括一光强传感器，所述光强传感器传送一感测信号至所述背光模组的处理器，所述处理器依据所述感测信号来控制所述光源的发光。
  19. 根据权利要求18所述的显示装置，其中所述处理器依据所述感测信号来调节所述光源的电流，以控制所述光源的发光强度。
  20. 根据权利要求18所述的显示装置，其中当所述光强传感器所感测的光强度高于一预设门坎值时，所述光源为关闭状态。
PCT/CN2012/085144 2012-11-02 2012-11-23 背光模块及显示装置 Ceased WO2014067196A1 (zh)

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