Design and fabrication of a trichroic prism for liquid crystal projection system

2000 ◽  
Author(s):  
Fang-Chuan Ho ◽  
Cheng-Wei Chu
Keyword(s):  
Liquid Crystal ◽  
Projection System

AN ELECTRICALLY TUNABLE FOCUSING PICO PROJECTION SYSTEM BASED ON A LIQUID CRYSTAL LENS ADOPTING A LIQUID CRYSTAL AND POLYMER COMPOSITE FILM

2011 ◽  
Vol 20 (04) ◽  
pp. 477-484 ◽  
Author(s):  
HUNG-CHUN LIN ◽  
MING-SYUAN CHEN ◽  
YI-HSIN LIN
Keyword(s):  
Liquid Crystal ◽  
Composite Film ◽  
Polymer Composite ◽  
Optical Analysis ◽  
Projection System ◽  
Polymer Composite Film ◽  
Liquid Crystal On Silicon ◽  
Focusing Lens ◽  
Liquid Crystal Lens ◽  
Image Performance

An electrically tunable liquid-crystal-on-silicon (LCOS)-based pico projection system based on a liquid crystal lens adopting a liquid crystal and polymer composite film (LCPCF) is demonstrated. The LC lens consists of two built-in sub-lenses: one is an electrically tunable focusing lens controlled by a LC layer and the other is a fixed focused LCPCF lens. The electrically tunable focusing range of the pico projection system is 200 cm to ~7 cm when the voltage is from 0 to 35 Vrms. The image performance is also demonstrated. The related optical analysis is discussed. This study opens a new window for electrically tunable focusing pico projection system.

scholarly journals Application of Dimming Compensation Technology Via Liquid Crystal Lens for Non-Imaging Projection Laser Systems

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 122
Author(s):  
Yi-Chin Fang ◽  
Cheng Tsai ◽  
Da-Long Cheng
Keyword(s):  
Liquid Crystal ◽  
Light Source ◽  
Optical Design ◽  
Good Control ◽  
Laser Source ◽  
Projection System ◽  
Lens Array ◽  
Local Dimming ◽  
Optical Paths ◽  
Liquid Crystal Lens

The main purpose of this paper is to explore a newly developed optical design, then to further improve the overhead lighting contrast in the laser projector module. In terms of the structural design of the projector, a liquid crystal lens array was used as the local dimming system for the light source, in order to achieve the objective, which was to significantly improve the contrast facility of the projection system. Second, in terms of the design of the light source, the output method for the light source was a laser light source employing arrays of micro-scanning. The main purpose was to compensate for the dim spots in the hole between the lenses in each unit of the liquid crystal when the liquid crystal lens array was locally dimmed, and thus significantly improving the contrast facility of the projection system. In terms of the software simulation, a liquid crystal lens array was used to simulate a pore size of 2.0 mm and focal lengths of 9 cm and 23 cm. The end effect gave good control and adjustment of the bright and dark areas during local dimming of the projector’s imaging chip components. For a single laser source, the maximum contrast for local dimming was about 128:1, 438:1, and 244:1, for the Red (R), Green (G), and Blue (B) optical paths, respectively. The light efficiency scores were approximately 20.91%, 20.05%, and 24.45%, for the R, G, and B optical paths, respectively. After compensation using a micro-scanning light source, the defect of having dim spots between the pores was remedied, and the light adjustment area became more uniform while the contrasts became smaller. The maximum contrasts were approximately 52:1, 122:1, and 110:1, for the R, G, and B optical paths, respectively. For the projector, when the liquid crystal lenses were not transmissive, the maximum uniformity scores were 82.25%, 87.15%, and 88.43%, for the R, G, and B optical paths, respectively.

Tunable liquid crystal lens for a holographic projection system

2013 ◽  
Author(s):  
Neil Collings ◽  
Yi-Hsin Lin ◽  
Hung-Chun Lin ◽  
Ming-Syuan Chen
Keyword(s):  
Liquid Crystal ◽  
Projection System ◽  
Liquid Crystal Lens

Liquid Crystal Light Valve Color Projection System

1997 ◽  
Author(s):  
Li Yulin ◽  
Yun Zhisheng ◽  
He Zhengquan ◽  
Liu Jifmg ◽  
Zheng Genxiang
Keyword(s):  
Liquid Crystal ◽  
Projection System ◽  
Light Valve

Design of Illuminating System for Liquid Crystal on Silicon Projection System on LED Light Source

2014 ◽  
Vol 51 (7) ◽  
pp. 072201
Author(s):  
赵斌 Zhao Bin ◽  
张国玉 Zhang Guoyu ◽  
陈启梦 Chen Qimeng ◽  
张健 Zhang Jian ◽  
王国名 Wang Guoming
Keyword(s):  
Liquid Crystal ◽  
Light Source ◽  
Projection System ◽  
Led Light ◽  
Liquid Crystal On Silicon ◽  
Illuminating System

Generation of optical vortices using a uniaxially aligned azo-dye-doped liquid crystal cell and space-variant polarization projection system

2019 ◽  
Vol 58 (26) ◽  
pp. 7145
Author(s):  
Moritsugu Sakamoto ◽  
Satoru Kaneko ◽  
Kohei Noda ◽  
Tomoyuki Sasaki ◽  
Nobuhiro Kawatsuki ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Azo Dye ◽  
Liquid Crystal Cell ◽  
Optical Vortices ◽  
Projection System ◽  
Crystal Cell ◽  
Space Variant
Sign in / Sign up

Export Citation Format

Share Document