WO2016106915A1 - 一种超薄面光源装置 - Google Patents

一种超薄面光源装置 Download PDF

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Publication number
WO2016106915A1
WO2016106915A1 PCT/CN2015/071632 CN2015071632W WO2016106915A1 WO 2016106915 A1 WO2016106915 A1 WO 2016106915A1 CN 2015071632 W CN2015071632 W CN 2015071632W WO 2016106915 A1 WO2016106915 A1 WO 2016106915A1
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Prior art keywords
light
light source
guide plate
source device
light guide
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PCT/CN2015/071632
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English (en)
French (fr)
Inventor
陈玲艳
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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 US14/428,363 priority Critical patent/US9563002B2/en
Publication of WO2016106915A1 publication Critical patent/WO2016106915A1/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
    • G02B6/0023—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
    • G02B6/0025—Diffusing sheet or layer; Prismatic sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • the invention relates to a backlight display technology, in particular to an ultra-thin surface light source device.
  • LED Light Emitting Diode
  • LCD liquid crystal display
  • the backlight is a light source that provides an LCD liquid crystal display (LCD) panel, and is mainly composed of a light source, a light guide plate, an optical film, a plastic frame, etc., and the backlight needs to have the characteristics of high brightness, long life, uniform illumination, and the like. LEDs are widely used in LCD backlights for their many advantages.
  • the edge-lit LCD is mainly used, and the direction of light scattering is guided by the light guide plate to improve the brightness of the panel and ensure the uniformity of the brightness of the panel.
  • the principle of LED illumination is that the PN junction itself is energized and illuminated, and the angle of the light is uniform in the direction of 360°, and most of the LEDs of the patch LED are 120°. Because of this, the light emitted by the LED lamp does not all enter the light guide plate, causing a large part of the light loss.
  • the present invention provides an ultra-thin surface light source device with high light utilization efficiency.
  • An ultra-thin surface light source device comprising an LED light source and a light guide plate, the LED light source comprising a light-emitting chip, the LED light source being disposed opposite to a light-in side of the light guide plate, the light-emitting chip and the light guide
  • a polarizer parallel to the light guide plate for projecting light emitted by the light emitting chip toward the light guide plate is further disposed between the plates.
  • the light emitting chip is disposed at a base of the LED light source, and the LED light source further comprises a transparent sealant sealing the light emitting chip.
  • the polarizer comprises a plurality of sawtooth grooves, and each of the sawtooth grooves comprises an upper upper serration surface and a lower lower serration surface, and an inclination angle of the upper serration surface with respect to the light incident side is smaller than The angle of inclination of the serrated surface with respect to the light incident side is described.
  • the polarizer is disposed on the sealant and is integrally disposed with the sealant.
  • the polarizer is fixed to the sealant.
  • the polarizer is spaced apart from the sealant.
  • the lower serrated surface is a reflective surface.
  • the lower serration surface is perpendicular to the light incident side.
  • the ultra-thin surface light source device further includes a reflective sheet disposed on a lower surface of the light guide plate, and the length of the reflective sheet on the light incident side is greater than the light guide plate.
  • the light emitted by the LED light source is well controlled to be deflected within a certain angle range, and the light is all entered into the light guide plate through the light entering side without increasing the thickness of the light guide plate, thereby improving the utilization of light. It is advantageous for further thinning of the light guide plate and the surface light source device.
  • Embodiment 1 is a schematic structural view of an ultra-thin surface light source device according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural view of an ultra-thin surface light source device according to Embodiment 2 of the present invention.
  • Embodiment 3 is a schematic structural view of an ultra-thin surface light source device according to Embodiment 3 of the present invention.
  • the ultra-thin surface light source device of the present invention comprises an LED light source 10 and a light guide plate 20, and the LED light
  • the source 10 includes a light-emitting chip 11 at the base and a transparent seal 12 that seals the light-emitting chip 11.
  • the LED light source 10 is disposed opposite to the light-incident side 21 of the light guide plate 20, and the light-emitting chip 11 and the light guide plate 20 are further disposed parallel to the guide.
  • the light incident side 21 of the light guide plate 20 and the polarizing member 30 for projecting the light emitted from the light emitting chip 11 toward the light guide plate 20.
  • the surface of the polarizer 30 opposite to the light guide plate 20 (ie, the surface facing the light incident side 21) is provided with a plurality of sawtooth grooves 31 arranged longitudinally, and each of the sawtooth grooves 31 includes an upper upper serrated surface 31a.
  • the lower lower serration surface 31b, and the inclination angle of the upper serration surface 31a with respect to the light entrance side 21 is smaller than the inclination angle of the lower serration surface 31b with respect to the light entrance side 21.
  • the polarizer 30 of the embodiment is disposed on the sealant 12 and integrally formed with the sealant 12.
  • the lower serration surface 31b is a reflective surface, and part of the light emitted from the light-emitting chip 11 is incident on the back surface of the lower serration surface 31b, and is further reflected to the lower right side into the light guide plate 20.
  • the lower serration surface 31b of the present embodiment is vertical. On the light entrance side 21.
  • the lower surface of the light guide plate 20 is provided with a reflection sheet 40 for mainly reflecting light irradiated to the bottom surface of the light guide plate 20.
  • the length of the reflection sheet 40 on the light incident side 21 is larger than that of the light guide plate 20.
  • the difference between the embodiment and the embodiment 1 is that the polarizer 30 is fixed on the sealant 12 and closely adheres to the outer surface of the sealant 12.
  • the polarizing member 30 is specifically an optical film, and may be specifically disposed on the outer surface of the rubber seal 12 by means of bonding.
  • the difference between this embodiment and Embodiment 1 is that the polarizer 30 is not in contact with the sealant 12, but is spaced apart.
  • the polarizer 30 can be specifically fixed on a corresponding structure of the display device such as a plastic frame, an iron frame or the like.
  • the polarizing member 30 between the light-emitting chip 11 and the light guide plate 20
  • the light emitted from the LED light source can be well controlled to be deflected within a certain angle range, and the light can be made without increasing the thickness of the light guide plate. All of the light entering the light guide plate enters the light guide plate, which improves the utilization of light, and is further thinned by the light guide plate and the surface light source device.

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

Abstract

一种超薄面光源装置，包括LED光源（10）和导光板（20），所述LED光源（10）包括发光芯片（11），所述LED光源（10）与所述导光板（20）的入光侧（21）相对设置，所述发光芯片（11）和所述导光板（20）之间还设有平行于所述导光板（20）、用于将所述发光芯片（11）发出的光朝所述导光板（20）投射的偏光件（30）。将LED光源（10）散发出的光线很好地控制在一定的角度范围内偏转，在不增加导光板（20）厚度的前提下使光线经入光侧（21）全部进入到导光板（20），提高了光线的利用率，有利于导光板（20）和面光源装置的进一步薄形化，同时不需要再设置导光板（20）的入光侧（21）上的喇叭口，简化了导光板制作工艺，利于降低成本。

Description

一种超薄面光源装置 技术领域
本发明涉及背光显示技术，尤其涉及一种超薄面光源装置。
背景技术
LED(Light Emitting Diode，即发光二极管)是一种极具竞争力的新型节能光源，有逐渐取代传统照明光源的趋势。它具有发光效率高、光线质量好、颜色纯度高、电压适宜、功耗低和使用寿命长等诸多优点。而背光源是提供LCD Liquid Crystal Display，即液晶显示器)面板的光源，主要由光源、导光板、光学膜片、塑胶框等组成,背光源需要具有亮度高、寿命长、发光均匀等特点。LED因其诸多优点被广泛使用在LCD背光源中。
目前由于LCD超薄概念的引入，多以侧光式LCD为主，利用导光板引导光线散射的方向，来提高面板的亮度并保证面板亮度的均一性。这就要求LED灯与导光板能很好的配合，以使更多光线进入导光板。但是我们知道LED发光原理是PN结本身通电发光，其出光的角度是各向均匀的，呈360°角，且一般贴片LED大多发光角度是120°。正因为如此，LED灯发出的光线并没有全部进入导光板，造成很大一部分光损失。
为了提高光线的利用率，市场上有一种技术将导光板上与LED光源相邻的入光侧做成楔形，以增加入光侧的面积接收更多光线，从而提高光线的利用率。但是这种做法使得导光板变厚，无法应用于超薄的显示装置中。
发明内容
鉴于现有技术存在的不足，本发明提供了一种光线利用率高的超薄面光源装置。
为了实现上述的目的，本发明采用了如下的技术方案：
一种超薄面光源装置，包括LED光源和导光板，所述LED光源包括发光芯片，所述LED光源与所述导光板的入光侧相对设置，所述发光芯片和所述导光 板之间还设有平行于所述导光板、用于将所述发光芯片发出的光朝所述导光板投射的偏光件。
其中，所述发光芯片设于所述LED光源的基部，所述LED光源还包括密封所述发光芯片的透明的封胶。
其中，所述偏光件包括多个锯齿槽，且每个所述锯齿槽包括一个上方的上锯齿面和下方的下锯齿面，且所述上锯齿面相对于所述入光侧的倾斜角度小于所述下锯齿面相对于所述入光侧的倾斜角度。
其中，所述偏光件设于所述封胶上，与所述封胶一体设置。
或者，所述偏光件固定于所述封胶上。
或者，所述偏光件与所述封胶间隔设置。
其中，所述下锯齿面为反光面。
其中，所述下锯齿面垂直于所述入光侧。
超薄面光源装置还包括设于所述导光板下表面的反射片，所述反射片在所述入光侧的长度大于所述导光板。
本发明将LED光源散发出的光线很好地控制在一定的角度范围内偏转，在不增加导光板厚度的前提下使光线经入光侧全部进入到导光板，提高了光线的利用率，有利于导光板和面光源装置的进一步薄形化。
附图说明
图1为本发明实施例1的超薄面光源装置结构示意图。
图2为本发明实施例2的超薄面光源装置结构示意图。
图3为本发明实施例3的超薄面光源装置结构示意图。
具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
实施例1
参阅图1，本发明的超薄面光源装置包括LED光源10和导光板20，LED光 源10包括基部的发光芯片11和密封发光芯片11的透明的封胶12，LED光源10与导光板20的入光侧21相对设置，发光芯片11和导光板20之间还设有平行于导光板20的入光侧21、用于将发光芯片11发出的光朝导光板20投射的偏光件30。
具体地，偏光件30与导光板20相对的表面(即图中朝向入光侧21的表面)开设有纵向排列的多个锯齿槽31，且每个锯齿槽31包括一个上方的上锯齿面31a和下方的下锯齿面31b，且上锯齿面31a相对于入光侧21的倾斜角度小于下锯齿面31b相对于入光侧21的倾斜角度。通过这样的设置，经过发光芯片11发出的光线射出后向右下方偏转，自入光侧21进入导光板20内，使LED光源10发散角度变小，光线的利用率大大提高。本实施例的偏光件30设于封胶12上，与封胶12一体成型设置。
进一步地，下锯齿面31b为反光面，发光芯片11发出的部分光线射入到下锯齿面31b背面后，被进一步反射至右下方进入到导光板20内，本实施例的下锯齿面31b垂直于入光侧21。
导光板20的下表面设有反射片40，主要用于反射照射至导光板20底面的光线，这里设置反射片40在入光侧21的长度大于导光板20。部分光线经偏光件30偏光作用后无法直接投射至入光侧21，反射片40将这一部分光线进一步反射，即可进入入光侧21，防止这部分光线泄漏，进一步提高了光线利用率。
实施例2
如图2所示，本实施例与实施例1的区别仅在于，偏光件30固定于封胶12上，紧贴该封胶12外表面。该偏光件30具体为光学薄膜，具体可以通过粘贴的方式设置在胶封12的外表面。
实施例3
如图3所示，本实施例与实施例1的区别仅在于，偏光件30与封胶12不接触，而是间隔设置。偏光件30具体可以固定在显示设备的相应结构如胶框、铁框等上。
本发明通过在发光芯片11和导光板20之间设置有偏光件30，可以将LED光源散发出的光线很好地控制在一定的角度范围内偏转，在不增加导光板厚度的前提下使光线经入光侧全部进入到导光板，提高了光线的利用率，有利于导光板和面光源装置的进一步薄形化。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (18)

  1. 一种超薄面光源装置，其中，包括LED光源和导光板，所述LED光源包括发光芯片，所述LED光源与所述导光板的入光侧相对设置，所述发光芯片和所述导光板之间还设有平行于所述导光板、用于将所述发光芯片发出的光朝所述导光板投射的偏光件。
  2. 根据权利要求1所述的超薄面光源装置，其中，所述发光芯片设于所述LED光源的基部，所述LED光源还包括密封所述发光芯片的透明的封胶。
  3. 根据权利要求2所述的超薄面光源装置，其中，所述偏光件包括多个锯齿槽，且每个所述锯齿槽包括一个上方的上锯齿面和下方的下锯齿面，且所述上锯齿面相对于所述入光侧的倾斜角度小于所述下锯齿面相对于所述入光侧的倾斜角度。
  4. 根据权利要求3所述的超薄面光源装置，其中，所述下锯齿面为反光面。
  5. 根据权利要求4所述的超薄面光源装置，其中，所述下锯齿面垂直于所述入光侧。
  6. 根据权利要求4所述的超薄面光源装置，其中，还包括设于所述导光板下表面的反射片，所述反射片在所述入光侧的长度大于所述导光板。
  7. 根据权利要求3所述的超薄面光源装置，其中，所述偏光件设于所述封胶上，与所述封胶一体设置。
  8. 根据权利要求7所述的超薄面光源装置，其中，所述下锯齿面为反光面。
  9. 根据权利要求8所述的超薄面光源装置，其中，所述下锯齿面垂直于所述入光侧。
  10. 根据权利要求8所述的超薄面光源装置，其中，还包括设于所述导光板下表面的反射片，所述反射片在所述入光侧的长度大于所述导光板。
  11. 根据权利要求3所述的超薄面光源装置，其中，所述偏光件固定于所述封胶上。
  12. 根据权利要求11所述的超薄面光源装置，其中，所述下锯齿面为反光面。
  13. 根据权利要求12所述的超薄面光源装置，其中，所述下锯齿面垂直于 所述入光侧。
  14. 根据权利要求12所述的超薄面光源装置，其中，还包括设于所述导光板下表面的反射片，所述反射片在所述入光侧的长度大于所述导光板。
  15. 根据权利要求3所述的超薄面光源装置，其中，所述偏光件与所述封胶间隔设置。
  16. 根据权利要求15所述的超薄面光源装置，其中，所述下锯齿面为反光面。
  17. 根据权利要求16所述的超薄面光源装置，其中，所述下锯齿面垂直于所述入光侧。
  18. 根据权利要求16所述的超薄面光源装置，其中，还包括设于所述导光板下表面的反射片，所述反射片在所述入光侧的长度大于所述导光板。
PCT/CN2015/071632 2014-12-31 2015-01-27 一种超薄面光源装置 WO2016106915A1 (zh)

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