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55.1: Edge‐Lit Hollow Backlight Using Tunable Reflective Polarizer for Liquid Crystal Displays
Author(s) -
Liu Tao,
Wheatley John,
O'Neill Mark,
Sousa Matthew E.
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256918
Subject(s) - backlight , polarizer , liquid crystal display , materials science , light emitting diode , optoelectronics , optics , liquid crystal , diode , polarization (electrochemistry) , viewing angle , total internal reflection , birefringence , physics , chemistry
A low‐cost solution for using light‐emitting‐diodes (LEDs) to illuminate large liquid crystal displays (LCDs) is developed. Following this approach, a 32″ single‐Side illuminated thin edge‐lit hollow backlight is demonstrated using high power LEDs as the light source. One of the key optical components is a new class of reflective polarizer that provides polarization, viewing angle, and recycling controls simultaneously over the system output. Uniformity and efficiency were realized as well as strong robustness to LED variations or failures. Benefits of hollow cavity light mixing to LED systems are discussed.