適用於色序式微型投影機之微透鏡陣列積分器光學系統研製

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姓名

江昇達(Sheng-Da Jiang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

適用於色序式微型投影機之微透鏡陣列積分器光學系統研製
(Development of Optical System with Micro-lens Array Integrator for Color-Sequential Pico-projector)

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至系統瀏覽論文 ( 永不開放)

摘要(中)

本論文提出一組微型投影機的架構。投影機採用L型光路來結合成像與非成像系統。光源選擇發光二極體(Light Emitting Diodes, LEDs)取代傳統燈泡，因為LED具有低耗電量、反應快、體積小、耐震動以及適合量產等優點。投影機之系統光閥為反射式矽基液晶顯示器(Liquid Crystal on Silicon, LCOS)，LCOS屬於色序式(color-sequential)的樣式。
非成像系統只用一組準直鏡，並採用單片微透鏡陣列(Micro-lens Array, MLA)來達成面板上光強度均勻化的目的。單片微透鏡陣列為雙面同曲率，微透鏡大小為320 μm × 180 μm，此種設計可以讓面板上之照度均勻度達到86%，並且有效地縮小非成像系統的體積。設計完成之非成像尺寸為31 mm × 11 mm × 11 mm。投影鏡頭共使用5片鏡片(2片球面玻璃和3片非球面塑膠)，設計出總長15 mm的定焦鏡頭，此鏡頭在距離50 cm處投射約A4大小的影像，而調製轉換函數(Modulation Transfer Function, MTF)在空間頻率94 lps/mm內所有視場皆大於0.5，光學畸變(Optical distortion)小於1.5%，結合非成像系統與成像系統尺寸為31 mm × 24 mm × 11 mm (不考慮組裝外殼)。非成像系統由外部廠商製作， LCOS面上的光能量分佈出現傾斜，且角度大於10°。LCOS有效面積上的光學效率為22%。

摘要(英)

In this thesis, we propose a pico-projector system. The projector including an image system and a non-image system is designed using an L-shape light path. Light emitting diodes (LEDs) are adopted to replace traditional lamps for projectors, because of low-power consumption, quick switch time, small volume and large production. Liquid crystal on silicon (LCOS) panel with color-sequential type is selected for the light valve in the system. The non-image system includes a set collimator, a homogenizer, and a set condenser. The set collimator consists of two sphere glass lenses. A piece of micro-lens array (MLA) is designed for homogenization. The same curvature radius is set for 1st and 2nd surface of a unit micro lens with area of 320 μm × 180 μm. The set condenser consists of two aspheric plastic lenses to distribute light within the LCOS active area. Base on this design, the uniformity on panel can achieve 86% and the system volume effectively reduce to 31 mm × 11 mm × 11 mm.
In terms of image system, projection lens consists of two sphere glass lenses and three aspheric plastic lenses. Projection lens is fixed-focus, and its total track is 15 mm. A4-size image is obtained at 50-cm distance. The modulation transfer function (MTF) is larger than 0.5 on all fields within spatial frequency 94 lps/mm. The optical distortion is smaller than 1.5%.
The whole size of projector is 31 mm × 24 mm × 11 mm without consideration of outer shell. The finished non-image system performs 22% optical efficiency on LCOS active area; however, light distribution tilts 10° on the LCOS surface degrading the color mix performing on the active area.

關鍵字(中)

★ 微型投影機
★ 微透鏡陣列

關鍵字(英)

★ Micro-lens array
★ Pico-projector

論文目次

摘要 ........................................................................................................................ i
Abstracts .............................................................................................................. ii
目錄 ...................................................................................................................... iii
圖目綠 ................................................................................................................... v
表目綠 .................................................................................................................. ix
第一章緒論 ......................................................................................................... 1
1-1前言 .......................................................................................................... 1
1-2研究動機 .................................................................................................. 3
第二章投影機系統架構 ..................................................................................... 4
2-1系統架構與運作原理 .............................................................................. 4
2-2系統元件 .................................................................................................. 5
2-3光展量計算 .............................................................................................. 8
第三章非成像系統設計 ..................................................................................... 9
3-1準直鏡&聚光鏡設計基本概念 .............................................................. 9
3-2準直鏡&聚光鏡設計 .............................................................................11
3-3微透鏡陣列設計 .................................................................................... 15
第四章成像系統設計 ....................................................................................... 17
4-1鏡頭設計規格 ........................................................................................ 17
4-2設計流程 ................................................................................................ 20
4-3設計結果 ................................................................................................ 21
4-4公差分析 ................................................................................................ 27
第五章微投影機系統模擬、量測、分析 ....................................................... 31
5-1各個元件的模擬分析 ............................................................................ 32
5-1-1準直鏡 ......................................................................................... 32
5-1-2微透鏡陣列 ................................................................................. 34
5-1-3聚光鏡組 ..................................................................................... 35
5-2 PBS反射穿透特性量測 ....................................................................... 37
5-3微投影機系統模擬分析 ........................................................................ 38
5-4非成像系統元件製作與元件量測 ....................................................... 43
5-5微投影機系統量測分析 ........................................................................ 52
5-5-1 LCOS面能量分佈 ...................................................................... 52
5-5-2微投影系統之效率量測 ............................................................. 55
第六章結論及未來展望 ................................................................................... 57
參考資料 ............................................................................................................. 58

參考文獻

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指導教授

孫文信、伍茂仁
(Wen-Shing Sun、Mount-Learn Wu)

審核日期

2011-7-7

推文