Liang Cheng

US Patent:

53942540, Feb 28, 1995

Filed:

Jan 3, 1994

Appl. No.:

8/176882

Inventors:

Liang T. Cheng - Portland OR

Assignee:

Greyhawk Systems, Inc. - Mountain View CA

International Classification:

G02F 11335
G02F 1135

US Classification:

359 42

Abstract:

A liquid crystal light valve projector assembly is disclosed here including (1) a multi dashed layered liquid crystal light valve having a light-writing side and a light projecting side, (2) light-writing means for producing modulated writing light representative of a given image, which writing light when written onto the light-writing side of said light valve causes the latter to modulate in a corresponding manner, and (3) light projecting means cooperating with the light-projecting side of said light valve for projecting a correspondingly modulated projection light beam onto a projection plane for visually displaying the given image. In addition to the components just recited, the liquid crystal light valve projector assembly disclosed here in also includes the fiber optic plate arrangement which is provided for coupling the light-writing means, for example a cathode ray tube, to the light valve and which is specifically designed to eliminate from the ultimately projected image the faint honeycomb pattern known as the "chicken wire effect". This is accomplished by polishing the fiber optic plate surfaces into smooth surfaces in which the reflectance at the outer perimeter of optical fiber bundles within each surface is less than twice the reflectance at any other position within a corresponding optical fiber bundle.