Title:
【発明の名称】複層の光学フィルム偏光子を用いる液晶ディスプレイ投射システム
Document Type and Number:
Japanese Patent JPH11508701
Kind Code:
A
Abstract:
A liquid crystal display (LCD) projection system including a projection panel, a light source, and a reflector. The projection panel includes an LCD and a polarizer on one side of the LCD and a reflective polarizer on the other side. The reflective polarizer is a multilayer stack of pairs of adjacent material layers. Each of the layer pairs exhibits a refractive index difference between the adjacent layers in a first direction in the plane of the reflective polarizer and exhibits essentially no refractive index difference between adjacent layers in a second direction in the plane of the reflective polarizer and orthogonal to the first direction. A quarter-wave plate is secured to the reflective polarizer. Light rays from the light source either pass through the reflective polarizer, and on to the LCD, or are reflected back toward the light source, depending on their polarization. Light which is reflected by the reflective polarizer is reflected by the reflector back toward the LCD again. The use of the quarter-wave plate and the reflector help to recycle what would typically be regarded as wasted light, while at the same time reducing heat build-up within the LCD.
Inventors:
Willet, Stephen Jay
Weber, Michael Ef
Order Kirk, Andrew Jay
John The, James M
Weber, Michael Ef
Order Kirk, Andrew Jay
John The, James M
Application Number:
JP50439797A
Publication Date:
July 27, 1999
Filing Date:
May 16, 1996
Export Citation:
Assignee:
Minnesota Mining and Manufacturing Company
International Classes:
G02B5/30; G02F1/13; G02F1/1335; G02F1/13357; (IPC1-7): G02F1/1335; G02B5/30; G02F1/13
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)