IP Library › Granted Patent US 5,657,140
Granted Patent Utility
US 5,657,140 · App. 08/559,275

Normally white twisted nematic LCD with positive and negative retarders

Inventors: Gang Xu, John A. VanderPloeg
Patented Case View Patent ↗
Granted: Aug 12, 1997 Filed: Nov 15, 1995
Inventors
Gang Xu
John A. VanderPloeg
Assignee (at issue)
OIS Optical Imaging Systems, Inc.

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Quick Facts
Patent No.
US 5,657,140
App. No.
08/559,275
Filed
1995-11-15
Granted
1997-08-12
Kind
A