Premium
55.2: Shaping Arbitrary Angular Luminance Distribution through Directional LGP and Single Inverted‐Concave Lenticular Film for Blue‐Phase LCD‐BLU Hybrid Structure
Author(s) -
Käläntär K
Publication year - 2012
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 - 10.1002/j.2168-0159.2012.tb05890.x
Subject(s) - optics , backlight , prism , liquid crystal display , luminance , materials science , viewing angle , eccentricity (behavior) , lens (geology) , physics , political science , law
A new backlighting optics for shaping a light cone of elliptical cross‐section with an arbitrary eccentricity was studied and realized. The optical structure employs a film with inverted line prism array on the back surface and concave micro‐lenticular lens array on the front surface in combination with a functional light guide featuring with louver prism array on the back surface, and convex lenticular light deflector on the front surface. By varying the radius of the concave lenticular lens on the film the angular luminance distribution can be changed. The variation can be controlled in a wide range in order to obtain light cone cross‐section with different eccentricities. This optical structure was applied to a blue phase LCD‐like structure in which the LCD was sandwiched between the light guide and the film for both illuminating and widening the viewing angle of the display.