LED微阵列投影系统设计

冯思悦; 梁静秋; 梁中翥; 吕金光; 陶金; 王维彪; 秦余欣; 孟德佳

doi:10.3788/CO.20191201.0088

LED微阵列投影系统设计

doi: 10.3788/CO.20191201.0088

cstr: 32171.14.CO.20191201.0088

冯思悦^{1, 2,},
梁静秋^1, ,,
梁中翥¹,
吕金光¹,
陶金¹,
王维彪¹,
秦余欣¹,
孟德佳¹

1.
中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室, 吉林长春 130033
2.
中国科学院大学, 北京 100049

基金项目:

国家自然科学基金 61274122

国家自然科学基金 61627819

吉林省科技发展计划 20160204007GX

吉林省科技发展计划 20180201024GX

广东省科技计划 2016B010111003

应用光学国家重点实验室开放基金，中国科学院青促会项目 2018254

详细信息

作者简介:
冯思悦(1991-), 女, 吉林省吉林市人, 硕士研究生。主要从事光学系统设计及微光机电系统方面的研究。E-mail:18744019144@163.com

梁静秋(1962—)，女，辽宁沈阳人，博士生导师。主要从事微小型光学系统、微光机电系统(MOEMS)及微结构光学方面的研究。E-mail:liangjq@ciomp.ac.cn

中图分类号: TH744
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出版历程
- 收稿日期: 2017-10-17
- 修回日期: 2017-11-01
- 刊出日期: 2019-02-01

Design of projection system for a micro-LED array

1.
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

Funds:

National Natural Science Foundation of China 61274122

National Natural Science Foundation of China 61627819

Jilin Province Science and Technology Development Plan 20160204007GX

Jilin Province Science and Technology Development Plan 20180201024GX

Guangdong Science and Technology Project 2016B010111003

Open Fund Project of SKLAO and Youth Innovation Promotion Association 2018254

More Information

Corresponding author: LIANG Jing-qiu. E-mail:liangjq@ciomp.ac.cn

摘要

摘要: 为满足便携式投影仪的市场需求，设计了一种基于LED微型阵列的投影系统。该系统由显示单元和投影物镜构成。采用尺寸为12 mm×9 mm的自发光LED微型阵列作为系统的显示单元，利用光学设计软件设计了投影物镜。投影物镜采用反远距光学结构，全视场角为80°，焦距为8 mm，属于强光、广角镜头。在空间频率20 lp/mm处，该物镜的调制传递函数大于0.85，畸变小于2%，符合投影系统的设计要求。该投影系统具有体积小，结构简单，投影效果好，易加工等诸多优势，可为第三代投影技术的发展提供参考。
- Micro-LED /
- 微型投影 /
- 显示单元 /
- 成像系统 /
- 大视场
Abstract: In order to meet market demand for portable projectors, a projection system using an LED micro array and composed of a display light source and an imaging system is designed. The size of the self-luminous micro-LED array is 12 mm×9 mm. This micro-LED array is used as the light source. A projection lens suitable for the light source is designed by using Zemax software. The projection adopts an anti-distance optical structure with a full field-of-view angle of 80 degrees and a focal length of 8 mm. This projection uses a strong-light and wide-angle lens. The modulation transfer function of the objective lens is greater than 0.85 at a spatial frequency of 20 lp/mm and its distortion is less than 2%, which meets the design requirements of the projection system. The projection system has many advantages, such as a small size, a simple structure, good projection, easy production, etc.. It can also provide reference for the development of third-generation projection technology.
- Micro-LED /
- pico-projection /
- display light /
- imaging system /
- wide field

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图 1 系统整体结构示意图

Figure 1. Schematic of optical system overall structure

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图 2 投影系统示意图

Figure 2. Sketch map of projection system

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图 3 反远距结构示意图

Figure 3. Structure of retrofocus lens

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图 4 优化后投影物镜光路示意图

Figure 4. Structure of optical path for optimized projection objective

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图 5 20 lp/mm处MTF曲线图

Figure 5. MTF curves of imaging system at 20 lp/mm

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图 6 像差分析图

Figure 6. Aberration analysis diagram

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图 7 能量及照度分析图

Figure 7. Analysis diagrams for energy and illumination

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图 8 光线追迹图及像面照度分析

Figure 8. Ray-tracing diagram and image illuminance map

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表 1 Micro-LED阵列参数表

Table 1. Parameters of micro-LED display

Arrays type	Panel size/mm	Length-width ratio	Pixel size/μm	Pixel amount
Red micro-LEDs	12×9	4:3	25×25	480×360
Green micro-LEDs	12×9	4:3	25×25	480×360
Blue micro-LEDs	12×9	4:3	25×25	480×360
Total pixels	(480×360)×3

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表 2 投影物镜相关参数及设计指标

Table 2. Optical technology parameters and design specifications

Parameters	Specifications
Chip size (diagonal)/mm	15
Focus length/mm	8
FOV/(°)	80
Wavelength/nm	400~700
F/#	2.5
Prism thickness/mm	20
Prism material	LAF13
MTF	MTF≥0.5@20 lp/mm
Distortion	≤3%

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表 3 光学系统公差范围

Table 3. Tolerance range in this optical system

Parameter	Value
Radius (fringes)	N=2
Thickness/mm	0.02
Decenter X/Y/mm	0.02
Tilt X/Y(degrees)	0.008 3
S+A Irregularity (fringes)	ΔN=0.2
Index of refractive	0.000 1
Abbe number/%	1

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表 4 20 lp/mm处光学系统的MTF

Table 4. MTF at 20 lp/mm in this optical system

Parameter	Value
Nominal	0.901
Best	0.899
Worst	0.762
Mean	0.866
Standard deviation	0.029

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