Double-layered liquid crystal light shutter for control of absorption and scattering of the light incident to a transparent display device

Jae-Won Huh; Byeong-Hun Yu; Dong-Myung Shin; Tae-Hoon Yoon

doi:10.1117/12.2077055

11 March 2015 Double-layered liquid crystal light shutter for control of absorption and scattering of the light incident to a transparent display device

Jae-Won Huh, Byeong-Hun Yu, Dong-Myung Shin, Tae-Hoon Yoon

Author Affiliations +

Proceedings Volume 9384, Emerging Liquid Crystal Technologies X; 938417 (2015) https://doi.org/10.1117/12.2077055
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

Recently, a transparent display has got much attention as one of the next generation display devices. Especially, active studies on a transparent display using organic light-emitting diodes (OLEDs) are in progress. However, since it is not possible to obtain black color using a transparent OLED, it suffers from poor visibility. This inevitable problem can be solved by using a light shutter. Light shutter technology can be divided into two types; light absorption and scattering. However, a light shutter based on light absorption cannot block the background image perfectly and a light shutter based on light scattering cannot provide black color. In this work we demonstrate a light shutter using two liquid crystal (LC) layers, a light absorption layer and a light scattering layer. To realize a light absorption layer and a light scattering layer, we use the planar state of a dye-doped chiral nematic LC (CNLC) cell and the focal-conic state of a long-pitch CNLC cell, respectively. The proposed light shutter device can block the background image perfectly and show black color. We expect that the proposed light shutter can increase the visibility of a transparent display.

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Jae-Won Huh, Byeong-Hun Yu, Dong-Myung Shin, and Tae-Hoon Yoon "Double-layered liquid crystal light shutter for control of absorption and scattering of the light incident to a transparent display device", Proc. SPIE 9384, Emerging Liquid Crystal Technologies X, 938417 (11 March 2015); https://doi.org/10.1117/12.2077055

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KEYWORDS

Camera shutters

Light scattering

Absorption

Liquid crystals

Opacity

Transmittance

LCDs

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