TW201504728A - 背光模組 - Google Patents

背光模組 Download PDF

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Publication number
TW201504728A
TW201504728A TW102127380A TW102127380A TW201504728A TW 201504728 A TW201504728 A TW 201504728A TW 102127380 A TW102127380 A TW 102127380A TW 102127380 A TW102127380 A TW 102127380A TW 201504728 A TW201504728 A TW 201504728A
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Taiwan
Prior art keywords
light
lens
backlight module
incident surface
diffusing plate
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TW102127380A
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English (en)
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陳柏洲
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鴻海精密工業股份有限公司
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Priority to TW102127380A priority Critical patent/TW201504728A/zh
Priority to US14/060,610 priority patent/US20150036322A1/en
Publication of TW201504728A publication Critical patent/TW201504728A/zh

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    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • 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

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

Abstract

一種背光模組，其包括多個發光二極體、多個透鏡及一擴散板，每個透鏡具有一入光面及一出光面，該擴散板具有一入光面及一出光面，該透鏡的出光面朝向該擴散板的入光面，該透鏡的入光面朝向發光二極體，發光二極體與透鏡一一對應地設置，發光二極體發出的光線從透鏡的入光面入射，從透鏡的出光面出射，從透鏡的出光面出射的光線垂直進入擴散板的入光面而從擴散板的出光面出射。

Description

背光模組
本發明涉及液晶顯示器的背光模組，尤其涉及一種具有多個發光二極體的背光模組。
習知技術中的一種用於液晶顯示器的直下式背光模組包括多個發光二極體、位於該發光二極體上方的一擴散板。通常，直下式背光模組使用較少的發光二極體，為了使發光二極體發出的光線能達到擴散板而獲得面光源，發光二極體上還罩置擴散透鏡使發光二極體發出的光線在進入擴散板前先被擴散透鏡改變進入擴散板時的入射角度。然而，發光二極體發出的光線經過擴散透鏡後在進入擴散板時的入射角度都非常大，而入射角度越大的光線經過擴散板的路徑越長，使得光線穿過擴散板的穿透率下降，導致背光模組的光利用效率大大降低。
有鑒於此，有必要提供一種光利用效率較高的背光模組。
一種背光模組，其包括多個發光二極體、多個透鏡及一擴散板，每個透鏡具有一入光面及一出光面，該擴散板具有一入光面及一出光面，該透鏡的出光面朝向該擴散板的入光面，該透鏡的入光面朝向發光二極體，發光二極體與透鏡一一對應地設置，發光二極體發出的光線從透鏡的入光面入射，從透鏡的出光面出射，從透鏡的出光面出射的光線垂直進入擴散板的入光面而從擴散板的出光面出射。
在本發明的背光模組中，發光二極體發出的光線在進入擴散板前被透鏡轉換成垂直於擴散板的入光面的光線，使得從透鏡出射的光線垂直地進入擴散板，大大縮短了光線在擴散板內的行程，大大提高了光線穿過擴散板的穿透率，進而提升了背光模組的光利用效率。
10‧‧‧背光模組
11‧‧‧光源
114‧‧‧發光二極體
112‧‧‧基板
12‧‧‧光學膜板組
122‧‧‧透鏡
121‧‧‧入光面
123‧‧‧出光面
124‧‧‧擴散板
125‧‧‧入光面
127‧‧‧出光面
129‧‧‧散射粒子
126、128‧‧‧增亮膜
圖1為本發明一實施例提供的背光模組的結構示意圖。
請參見圖1，本發明一實施例提供的用作液晶顯示器的背光源的直下式背光模組10，該背光模組10包括一光源11及設置在該光源11之上的一光學膜板組12。該光源11包括一基板112及設於該基板112上、呈矩陣排列的多個發光二極體114。該光學膜板組12包括多個透鏡122、一擴散板124及二增亮膜126、128。
該擴散板124具有一入光面125及與該入光面125相對的一出光面127。該入光面125及該出光面127均為平面，且相互平行。根據需要，擴散板124的入光面125和出光面127之間填充有大量的散射粒子129用以散射光線。
所述增亮膜126、128設置在該擴散板124之上，用於將從擴散板124出射的均勻化光線集中為具有特定的角度的面光源再向液晶面板射出。
透鏡122位於所述光源11與擴散板124之間。每個透鏡122具有一入光面121及與該入光面121相對的一出光面123。該出光面123為一平面，其朝向該擴散板124的入光面125。在本實施例中，該出光面123與該擴散板124的入光面125正相對，每個透鏡122的出光面123貼設在該擴散板124的入光面125上。該入光面121為一朝向發光二極體114凸出的曲面。
發光二極體114的數目與透鏡122的數目一致。發光二極體114與透鏡122均呈矩陣狀排列，發光二極體114與透鏡122一一對應地設置。每一個發光二極體114相對應地設置在一透鏡122的焦點處。發光二極體114發出的光線從透鏡122的入光面121入射，然後從透鏡122的出光面123出射。從透鏡122的出光面123出射的光線彼此相平行，並以垂直於擴散板124的入光面125的角度進入擴散板124，這樣光線經過擴散板124的路徑為最短。
本發明的背光模組10藉由將發光二極體114陣列設置於相對應的每個透鏡122的焦點位置處，使發光二極體114發出的光線在進入擴散板124前被透鏡122轉換成垂直於擴散板124的入光面125的光線，使得從透鏡122出射的光線垂直地進入擴散板124，大大縮短了光線在擴散板124內的行程，從而大大提高了光線穿過擴散板124的穿透率，進而提升了背光模組10的光利用效率。
可以理解的是，對於本領域的普通技術人員來說，可以根據本發明的技術構思做出其他各種相應的改變與變形，而所有這些改變與變形都應屬於本發明權利要求的保護範圍。
無
10‧‧‧背光模組
11‧‧‧光源
114‧‧‧發光二極體
112‧‧‧基板
12‧‧‧光學膜板組
122‧‧‧透鏡
121‧‧‧入光面
123‧‧‧出光面
124‧‧‧擴散板
125‧‧‧入光面
127‧‧‧出光面
129‧‧‧散射粒子
126、128‧‧‧增亮膜

Claims (10)

  1. 一種背光模組，其包括多個發光二極體、多個透鏡及一擴散板，其改良在於，每個透鏡具有一入光面及一出光面，該擴散板具有一入光面及一出光面，該透鏡的出光面朝向該擴散板的入光面，該透鏡的入光面朝向發光二極體，發光二極體與透鏡一一對應地設置，發光二極體發出的光線從透鏡的入光面入射，從透鏡的出光面出射，從透鏡的出光面出射的光線垂直進入擴散板的入光面而從擴散板的出光面出射。
  2. 如申請專利範圍第1項所述的背光模組，其中，每一個發光二極體設置在對應的透鏡的焦點處。
  3. 如申請專利範圍第1項所述的背光模組，其中，該擴散板的入光面及出光面均為平面，且相互平行。
  4. 如申請專利範圍第3項所述的背光模組，其中，該透鏡的出光面為一平面，貼設在該擴散板的入光面上。
  5. 如申請專利範圍第4項所述的背光模組，其中，該透鏡的入光面為一朝向該發光二極體凸出的曲面。
  6. 如申請專利範圍第1項所述的背光模組，其中，該發光二極體與該透鏡均呈矩陣狀排列。
  7. 如申請專利範圍第1項所述的背光模組，其中，還包括一基板，該發光二極體設於該基板上。
  8. 如申請專利範圍第1項所述的背光模組，其中，還包括設置在該擴散板之上的二增亮膜。
  9. 如申請專利範圍第1項所述的背光模組，其中，該擴散板的入光面和出光面之間填充有散射粒子。
  10. 如申請專利範圍第1項所述的背光模組，其中，該發光二極體的數目與該透鏡的數目一致。
TW102127380A 2013-07-31 2013-07-31 背光模組 TW201504728A (zh)

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Application Number Priority Date Filing Date Title
TW102127380A TW201504728A (zh) 2013-07-31 2013-07-31 背光模組
US14/060,610 US20150036322A1 (en) 2013-07-31 2013-10-22 Backlight module

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Application Number Priority Date Filing Date Title
TW102127380A TW201504728A (zh) 2013-07-31 2013-07-31 背光模組

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* Cited by examiner, † Cited by third party
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EP3553372A1 (en) * 2018-04-13 2019-10-16 Joanneum Research Forschungsgesellschaft mbH Freeform optical structures for direct-lit applications

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* Cited by examiner, † Cited by third party
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JP2003121609A (ja) * 2001-10-11 2003-04-23 Hitachi Ltd 光学シートおよびこれを備えた表示装置
US7229199B2 (en) * 2005-10-21 2007-06-12 Eastman Kodak Company Backlight using surface-emitting light sources
US20090214828A1 (en) * 2008-02-26 2009-08-27 Vicki Herzl Watkins Blunt tip prism film and methods for making the same
US20130033849A1 (en) * 2011-08-05 2013-02-07 Sharp Kabushiki Kaisha Backlight

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