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Optimization of bi‐layered nano‐wire grids as high‐efficiency polarizers for power recycling in liquid‐crystal displays
Author(s) -
Lin XiaoWen,
Hu Wei,
Wu ZiJian,
Hu XiKui,
Zhu Ge,
Lu YanQing,
Cui HongQing
Publication year - 2011
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/jsid19.6.441
Subject(s) - polarizer , transmittance , liquid crystal display , materials science , contrast ratio , backlight , optics , optoelectronics , brightness , fabrication , power (physics) , electrical efficiency , nano , composite material , medicine , physics , birefringence , alternative medicine , pathology , quantum mechanics
— Bi‐layered Al nano‐wire grids (N WGs) are proposed as high‐efficiency polarizers for power recycling in liquid‐crystal displays (LCDs). In comparison with single‐layered NWGs, the bi‐layered scheme is more cost‐effective with both less and more controllable fabrication steps. Two types of 150‐nm‐period NWGs with different cross sections were characterized and theoretically analyzed. A TM transmittance of over 66% and a contrast ratio as high as 8000 in the visible range were calculated. Furthermore, 5–8% increase in TM transmittance and an almost 20% enhancement in contrast ratio are achievable. The NWG sheet with a large contrast ratio as well as a high optical throughput acts as a reflective polarizer in the power‐recycling system of LCD backlight units. A total transmittance of above 70% in the visible region is predicted for the power‐recycling process, which is at least 9% higher in total light efficiency than the claimed result of commercial dual brightness‐enhancement film (DBEF).