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A reflective color STN‐LCD with a single polarizer and double retardation films
Author(s) -
Fujita S.,
Yamaguchi H.,
Mizuno H.,
Ohtani T.,
Sekime T.,
Hatanaka T.,
Ogawa T.
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 - 10.1889/1.1985283
Subject(s) - polarizer , liquid crystal display , materials science , rgb color model , gamut , optics , color difference , contrast ratio , backlight , color filter array , color gel , optoelectronics , computer science , layer (electronics) , artificial intelligence , computer vision , thin film transistor , physics , filter (signal processing) , birefringence , composite material
— A reflective color STN‐LCD with a single polarizer and double retardation films has been investigated. The double retardation films arranged in front of the LC layer enabled the LCD to contain reflective electrodes inside the panel. This configuration achieves a bright image with no parallax. A new construction of a reflective STN‐LCD with a single polarizer has been developed by means of our own method in which the color difference Δ E * as the optimizing parameter has been used. Further, RGB color filters have been newly designed for our reflective LCD, and an aluminum (Al) layer has been introduced as a reflective electrode. As a result, we have realized a 7.8‐in.‐diagonal reflective color STN‐LCD (640 × 480) which has 15% reflectance, 14:1 contrast ratio, 4096‐color capability, and sufficient color gamut. It has been confirmed that the single‐polarizer reflective color STN‐LCD has sufficient performance for mobile business tools. We believe that it will be a key device for this application.