71.2: An Integrated Photo Sensor Array on Liquid-Crystal-On-Silicon (LCOS) Microdisplay for Automatic White Balance

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.

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Design of an elliptic spot illumination system in LED-based color filter–liquid-crystal-on-silicon pico projectors for mobile embedded projection

Applied Optics ◽

10.1364/ao.51.003162 ◽

2012 ◽

Vol 51 (16) ◽

pp. 3162 ◽

Cited By ~ 9

Author(s):

Enguo Chen ◽

Feihong Yu

Keyword(s):

Liquid Crystal ◽

Color Filter ◽

Illumination System ◽

Liquid Crystal On Silicon

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Birefringent films for contrast enhancement of liquid crystal on silicon projection systems

Journal of Vacuum Science & Technology A Vacuum Surfaces and Films ◽

10.1116/1.2189263 ◽

2006 ◽

Vol 24 (4) ◽

pp. 1546-1551 ◽

Cited By ~ 1

Author(s):

Karen Hendrix ◽

Kim Tan ◽

Markus Duelli ◽

David Shemo ◽

Markus Tilsch

Keyword(s):

Liquid Crystal ◽

Contrast Enhancement ◽

Liquid Crystal On Silicon

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Phase Compensation of the Non-Uniformity of the Liquid Crystal on Silicon Spatial Light Modulator at Pixel Level

Sensors ◽

10.3390/s21030967 ◽

2021 ◽

Vol 21 (3) ◽

pp. 967

Author(s):

Zhen Zeng ◽

Zexiao Li ◽

Fengzhou Fang ◽

Xiaodong Zhang

Keyword(s):

Liquid Crystal ◽

Phase Modulation ◽

Spatial Light Modulator ◽

Characteristic Curve ◽

Physical Structure ◽

Measuring System ◽

Light Modulator ◽

Phase Compensation ◽

Modulation Characteristic ◽

Liquid Crystal On Silicon

Phase compensation is a critical step for the optical measuring system using spatial light modulator (SLM). The wavefront distortion from SLM is mainly caused by the phase modulation non-linearity and non-uniformity of SLM’s physical structure and environmental conditions. A phase modulation characteristic calibration and compensation method for liquid crystal on silicon spatial light modulator (LCoS-SLM) with a Twyman-Green interferometer is illustrated in this study. A method using two sequences of phase maps is proposed to calibrate the non-uniformity character over the whole aperture of LCoS-SLM at pixel level. A phase compensation matrix is calculated to correct the actual phase modulation of the LCoS-SLM and ensure that the designed wavefront could be achieved. Compared with previously known compensation methods, the proposed method could obtain the phase modulation characteristic curve of each pixel on the LCoS-SLM, rather than a mono look-up table (LUT) curve or multi-LUT curves corresponding to an array of blocks over the whole aperture of the LCoS-SLM. The experiment results show that the phase compensation precision could reach a peak-valley value of 0.061λ in wavefront and this method can be applied in generating freeform wave front for precise optical performance.

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