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High‐performance reflective STN‐LCD with a blazed reflector
Author(s) -
Hiyama Ikuo,
Itoh Osamu,
Kondo Katsumi,
Arimoto Akira
Publication year - 1999
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1985270
Subject(s) - optics , reflector (photography) , specular reflection , luminance , brightness , distributed bragg reflector , reflection (computer programming) , materials science , liquid crystal display , scattering , light scattering , optoelectronics , computer science , physics , light source , laser , programming language
— A reflective super‐twisted‐nematic liquid‐crystal display (STN‐LCD) using a blazed reflector is proposed. Application of the blazed reflector improves luminance and contrast ratio in reflective LCDs by directing the reflected image toward the observer and also by misaligning it from the direction of the surface reflection. The reflector needs proper scattering to eliminate casting a background by a specular image. Therefore, we studied two methods: one which makes the surface of the reflector uneven and the other which applies light‐scattering material between the display and the reflector. Key features include almost a doubling in brightness and contrast ratio using the blazed reflector with the light‐scattering material. Moreover, good white representation is obtained to optimize the refractive index in the normal direction of the retardation film.