TWI553915B - 發光二極體裝置及採用該裝置的液晶顯示裝置 - Google Patents

發光二極體裝置及採用該裝置的液晶顯示裝置 Download PDF

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TWI553915B
TWI553915B TW101148888A TW101148888A TWI553915B TW I553915 B TWI553915 B TW I553915B TW 101148888 A TW101148888 A TW 101148888A TW 101148888 A TW101148888 A TW 101148888A TW I553915 B TWI553915 B TW I553915B
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light
emitting diode
light emitting
phosphor
powder
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曾永昌
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鴻海精密工業股份有限公司
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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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • 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
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

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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)
  • Led Device Packages (AREA)
  • Liquid Crystal (AREA)

Description

發光二極體裝置及採用該裝置的液晶顯示裝置
本發明涉及發光裝置，尤其涉及一種發光二極體裝置及採用該裝置的液晶顯示裝置。
習知的發光二極體裝置，例如發光二極體背光模組通常採用多個藍光晶片配合黃色螢光粉來得到白色出射光線。
然而發光二極體晶片的光線出射角度大約為120°，且正向出射光線的光強大於側向出射光線的光強。目前，業界通常會採用一藍光發光二極體晶片搭配黃色螢光粉，並在藍光發光二極體晶片與黃色螢光粉外設置二次光學透鏡，藍光發光二極體晶片發出的部分藍光激發黃色螢光粉產生黃光，黃光與藍光發光二極體晶片發出的另一部分藍光混合得到白光，白光經過二次光學透鏡後使其發散角擴大以獲得一較均勻的光場分佈。然而，當使用二次光學透鏡將混合而得到的白光的發散角擴大時會產生黃光圈效應，當其用作顯示器的背光照明時會產生色差，導致產品品質下降。
有鑒於此，有必要提供一種色度均勻的發光二極體裝置。
一種發光二極體裝置，包括發光二極體晶片，還包括二次透鏡和內含有螢光粉的螢光層，所述二次透鏡設置於發光二極體晶片與 螢光層之間，所述發光二極體晶片發出的光經過二次透鏡擴散後激發螢光層內的螢光粉混合得到白光。
一種液晶顯示裝置，包含液晶模組和上述的發光二極體裝置，其中該液晶模組設置於螢光層遠離二次透鏡的一側。
上述發光二極體裝置中，採用二次透鏡直接覆蓋單色發光二極體晶片，從而得到較為發散的單色光，該單色光射入擴散板進行進一步的擴散，從而得到更加均勻的單色光，該單色光射向螢光層從而激發螢光粉並混光得到白光。避免光線先射向螢光層並混光得到白光後，再將白光射向二次透鏡而導致多波段的光在二次透鏡的發散下產生黃光圈效應，當其用作顯示器的背光照明時會產生色差，導致產品品質下降的缺失。
100‧‧‧發光二極體裝置
200‧‧‧液晶顯示裝置
10‧‧‧發光二極體晶片
20‧‧‧擴散板
21‧‧‧入光面
22‧‧‧出光面
23‧‧‧微結構
30‧‧‧螢光層
40‧‧‧二次透鏡
50‧‧‧液晶模組
圖1是本發明實施方式提供的一種發光二極體裝置剖視示意圖。
圖2是本發明實施方式提供的採用發光二極體裝置的液晶顯示裝置的剖視示意圖。
請參見圖1，圖1為本發明實施方式的發光二極體裝置100的示意圖。發光二極體裝置100包含若干發光二極體晶片10、擴散板20、螢光層30和二次透鏡40。
所述發光二極體晶片10均為藍光晶片，每一二次透鏡40設置於一發光二極體晶片10上。發光二極體晶片10發出的光線經過該二次透鏡40的發散而發生偏轉，從而形成單一波長的藍光，並形成大於120°的出光角度。進一步的，由於每一發光二極體晶片10出射 的光線經二次透鏡40後均擴大，因此相鄰兩發光二極體晶片10之間的區域的光強增大，從而可適當增加相鄰兩發光二極體晶片10之間的排布間距，採用較少的發光二極體晶片10即可實現相同區域的照明。
所述擴散板20設置於覆蓋發光二極體晶片10的二次透鏡40與螢光層30之間。發光二極體晶片10發出的光依次經二次透鏡40、擴散板20及螢光層30而出射。該擴散板20的材質為透明有機樹脂，如聚甲基丙烯酸甲酯(Polymethyl Methacrylate，PMMA)或聚碳酸酯(Polycarbonate，PC)，而且該擴散板20內摻入有光散射粒子，能夠進一步的使從二次透鏡40出射的光線均勻擴散，得到均勻出射的單波長藍光。該擴散板20大致為平板狀，其包括入光面21和出光面22。該入光面21為非平坦表面，該入光面21上設有若干微結構23。發光二極體晶片10發出的光線經入光面21直接入射擴散板20，當入射至擴散板20內部的光線在擴散板20中擴散的過程中經過若干微結構23的反射而使光線擴散更加均勻。
所述螢光層30內均勻分佈有螢光粉。
在實際應用中，根據混光原理，可以有以下一些搭配組合，用以產生白光。發光二極體晶片10為複數個藍光晶片，螢光層30包含黃色螢光粉。或者，發光二極體晶片10為複數個藍光晶片，螢光層30包含紅色螢光粉和綠色螢光粉的組合。再或，發光二極體晶片10包含近紫外光晶片，螢光層30包含紅色螢光粉、綠色螢光粉和藍色螢光粉的組合。近紫外光晶片發出近紫外光，其波長為200奈米至380奈米。
本實施例中，採用藍光晶片和黃色螢光粉的搭配組合來達成白光 。每一發光二極體晶片10發出的藍色光線先射入二次透鏡40中，從而產生發散的單波長藍光，再射入擴散板20中，由於擴散板20中的擴散粒子均勻擴散。不論該發光二極體晶片10與相鄰的發光二極體晶片10之間的距離如何，所有發光二極體晶片10發出的光線均能通過擴散板20的擴散作用均勻分散到擴散板20的整個區域。光線經過擴散板20後形成均勻的藍光並從擴散板20的出光面22出射，進而入射到螢光層30中。由於入射到螢光層30的光線為均勻的藍光，且螢光層30內的螢光粉均勻分佈，因此藍光被螢光粉激發後混合形成均勻的白光。避免因入射到螢光層30的光線不均勻，從而導致在螢光層30的不同區域激發並混合後形成不同色度的白光，而造成出光不均勻的現象。
進一步的，所述若干發光二極體晶片10等間距排列，且每一發光二極體晶片10的規格相同，即，每一發光二極體晶片10的出光角度和出光強度大致相同。由此可使入射到擴散板20的光線易於擴散並形成均勻的藍光。
本發明的發光二極體裝置100是採用二次透鏡40直接覆蓋單色發光二極體晶片10，從而得到較為發散的單色光，該單色光射入擴散板20進行進一步的擴散，從而得到更加均勻的單色光，該單色光射向螢光層30從而激發螢光粉並混光得到白光。避免光線先射向螢光層並混光得到白光後，再將白光射向二次透鏡而導致多波段的光在二次透鏡的發散下產生黃光圈效應，當其用作顯示器的背光照明時會產生色差，導致產品品質下降的缺失。
本發明提供的發光二極體裝置100可以應用於液晶顯示裝置的背光源。請參見圖2。所述液晶顯示裝置200包含液晶模組50和上述 的發光二極體裝置100，其中，發光二極體裝置100包含擴散板20、若干發光二極體晶片10和螢光層30。液晶模組50設置於螢光層30的遠離二次透鏡40的一側。
本發明中發光二極體晶片10的數量根據實際需要設定。
綜上所述，本發明確已符合發明專利之要件，遂依法提出專利申請。惟，以上所述者僅為本發明之較佳實施方式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案技藝之人士爰依本發明之精神所作之等效修飾或變化，皆應涵蓋於以下申請專利範圍內。
100‧‧‧發光二極體裝置
10‧‧‧發光二極體晶片
20‧‧‧擴散板
21‧‧‧入光面
22‧‧‧出光面
23‧‧‧微結構
30‧‧‧螢光層
40‧‧‧二次透鏡

Claims (8)

  1. 一種發光二極體裝置，包括發光二極體晶片，其改良在於：還包括二次透鏡、擴散板和內含有螢光粉的螢光層，所述二次透鏡設置於發光二極體晶片與螢光層之間，所述發光二極體晶片和所述螢光層分別位於擴散板的兩側，所述發光二極體晶片發出的光依次經過二次透鏡擴散後、再經擴散板後激發螢光層內的螢光粉混合得到白光。
  2. 如申請專利範圍第1項所述的發光二極體裝置，其中，所述擴散板內包含光散射粒子。
  3. 如申請專利範圍第1項所述的發光二極體裝置，其中，所述擴散板包括入光面和與入光面相對的出光面。
  4. 如申請專利範圍第3項所述的發光二極體裝置，其中，所述入光面上設置有微結構。
  5. 如申請專利範圍第1項所述的發光二極體裝置，其中，所述發光二極體晶片為藍光晶片，所述螢光層內的螢光粉為黃色螢光粉。
  6. 如申請專利範圍第1項所述的發光二極體裝置，其中，所述發光二極體晶片為藍光晶片，所述螢光層內的螢光粉為紅色螢光粉和綠色螢光粉的組合。
  7. 如申請專利範圍第1項所述的發光二極體裝置，其中，所述發光二極體晶片為近紫外光晶片，所述螢光層內的螢光粉為紅色螢光粉、綠色螢光粉和藍色螢光粉的組合。
  8. 一種液晶顯示裝置，包含液晶模組和如申請專利範圍第1項至第7項中任一項所述的發光二極體裝置，其中該液晶模組設置於螢光層遠離二次透鏡的一側。
TW101148888A 2012-12-21 2012-12-21 發光二極體裝置及採用該裝置的液晶顯示裝置 TWI553915B (zh)

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US13/923,198 US20140176866A1 (en) 2012-12-21 2013-06-20 Led device and liquid crystal display device

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CN105137651B (zh) * 2015-06-30 2017-12-05 武汉华星光电技术有限公司 背光模组和液晶显示器
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