用于激光背光源电视的扫描分光与消散斑系统

宋少华

doi:10.3788/OPE.20192702.0271

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用于激光背光源电视的扫描分光与消散斑系统

现代应用光学 | 更新时间：2020-08-13

- 用于激光背光源电视的扫描分光与消散斑系统
- Scanning beam splitting and speckle reduction system for laser backlight TV
- 光学精密工程 2019年27卷第2期页码：271-278
- 作者机构：
  
  1.山西大学激光光谱研究所量子光学与光量子器件国家重点实验室，山西太原 030006
  2.极端光学协同创新中心，山西太原 030006
- 作者简介：
  
  [ "宋少华 (1989-)，男，山西忻州人，硕士研究生，2012年于杭州电子科技大学获得学士学位，主要从事激光散斑抑制的研究。E-mail：eisenhower0304@qq.com" ]
- 基金信息：
  
  国家重点研发计划重点专项(2016YFB0401903);山西省重点研发计划重点专项(一般)国际合作项目(201703D421015)
- DOI：10.3788/OPE.20192702.0271
  中图分类号： O439; TN949.15
- 收稿日期：2018-09-21，
  
  录用日期：2018-11-20，
  
  纸质出版日期：2019-02-15
- 稿件说明：
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宋少华. 用于激光背光源电视的扫描分光与消散斑系统[J]. 光学精密工程, 2019,27(2):271-278.

Shao-hua SONG. Scanning beam splitting and speckle reduction system for laser backlight TV[J]. Optics and precision engineering, 2019, 27(2): 271-278.
宋少华. 用于激光背光源电视的扫描分光与消散斑系统[J]. 光学精密工程, 2019,27(2):271-278. DOI： 10.3788/OPE.20192702.0271.

Shao-hua SONG. Scanning beam splitting and speckle reduction system for laser backlight TV[J]. Optics and precision engineering, 2019, 27(2): 271-278. DOI： 10.3788/OPE.20192702.0271.

摘要

针对单颗激光二极管光功率过高不能直接用于激光液晶电视光源阵列的限制，本文设计了将高功率激光束分为多束功率接近的子光束的扫描分光系统，从而为液晶电视提供激光背光。系统中激光器发出的准直光束经过扫描振镜进行二维扫描后，经凸透镜和柱面透镜会聚成一条细线型光束耦合进一维多模光纤阵列，从而达到分光的目的。此外，基于扫描振镜和多模光纤实现了系统散斑的抑制。实验结果显示，11根光纤的平均单根出射功率为674.13 μW，离散系数为16%，平均散斑对比度为0.162。使用激光作为背光源的激光液晶电视因其优秀的显示性能而具备强大的市场竞争力和广阔的市场前景。

Abstract

Lasers demonstrate characteristics of high brightness and good monochromaticity. Moreover

the cost of liquid crystal display (LCD) planes are low as they have been developed extensively. Because of their excellent display performance

laser LCD televisions (TVs)

which use lasers as their backlight

demonstrate strong market competitiveness and extensive market potential. The use of a light source array is a common technique for backlight system design. To limit the high power supplied by a single laser diode to an array

this study designed a scanning beam splitting system that divided the high-power laser beam into multiple sub-beams with sufficient power to provide a laser backlight for LCD TVs. The collimated laser beam in this system was initially scanned in two dimensions by a galvanometer scanner and then made to converge into a narrow linear beam by a convex lens and a cylinder lens; finally

it was coupled into an optical multimode fiber array. Thus

beam splitting was achieved. In addition

based on the scanning mirror and multimode fibers

the system also exhibited a speckle reduction effect. The experimental results demonstrated that the coefficient of variation in the average output power of 11 fibers is 16%

with an average value of 674.13 μW

and their average speckle contrast is 0.162.

关键词

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