US2002171793A1PendingUtilityA1

Achromatic compound retarder

39
Assignee: COLORLINK INCPriority: Apr 7, 1995Filed: Apr 30, 2002Published: Nov 21, 2002
Est. expiryApr 7, 2015(expired)· nominal 20-yr term from priority
Inventors:Gary D. SharpKristina M. JohnsonMichael G. RobinsonJianmin Chen
G02F 1/141G02F 2413/07G02F 2413/03G02F 2203/04G02F 2203/62G02F 1/133638G02F 1/13471G02F 2413/02G02F 2413/08G02F 2413/01C09K 19/0225
39
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Claims

Abstract

This invention provides achromatic compound retarders, achromatic polarization switches, and achromatic shutters using the liquid crystal compound retarders. It further provides achromatic variable retardance smectic and nematic liquid crystal retarders. The achromatic compound retarders according to the invention are used to create achromatic inverters for display applications. The display comprises one or more retarders having in-plane retardance and in-plane orientation, at least one of the retarders being an actively controlled liquid crystal retarder, and a ferroelectric liquid crystal display, wherein the one or more retarders work in combination with the ferroelectric liquid crystal display to provide four states of brightness.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A display, comprising: 
 one or more retarders having in-plane retardance and in-plane orientation, at least one of the retarders being an actively controlled liquid crystal retarder; and    a ferroelectric liquid crystal display, wherein the one or more retarders work in combination with the ferroelectric liquid crystal display to provide four states of brightness.    
     
     
         2 . The display according to  claim 1 , wherein the display is a reflective display and the one or more retarders are disposed on a light input side of the ferroelectric liquid crystal display.  
     
     
         3 . The display according to  claim 1 , wherein the display is a transmissive display and the one or more retarders are disposed on a light input side of the ferroelectric liquid crystal display.  
     
     
         4 . The display according to  claim 3 , further comprising one or more retarders having in-plane retardance and in-plane orientation disposed on a light output side of the ferroelectric liquid crystal display, at least one of the retarders being an active retarder.  
     
     
         5 . The display according to  claim 2 , further comprising a linear polarizer disposed on a light input side of the one or more retarders.  
     
     
         6 . The display according to  claim 2 , further comprising a beamsplitter disposed on a light input side of the one or more retarders.  
     
     
         7 . The display according to  claim 3 , further comprising a linear polarizer disposed on a light input side of the one or more retarders.  
     
     
         8 . The display according to  claim 4 , further comprising a linear polarizer disposed on a light output side of the one or more retarders disposed on a light output side of the ferroelectric liquid crystal display.  
     
     
         9 . The display according to  claim 1 , wherein the at least one actively controlled liquid crystal retarder comprises at least one smectic liquid crystal retarder.  
     
     
         10 . The display according to  claim 1 , wherein the at least one actively controlled liquid crystal retarder comprises at least one nematic liquid crystal retarder.  
     
     
         11 . The display according to  claim 10 , wherein the at least one nematic liquid crystal retarder comprises at least one pi-cell.  
     
     
         12 . The display according to  claim 10 , wherein the at least one nematic liquid crystal retarder comprises two pi-celsl, the two pi-cells having parallel orientations.  
     
     
         13 . The display according to  claim 1 , wherein the one or more retarders further comprises a passive retarder.  
     
     
         14 . The display according to  claim 2 , wherein the one or more retarders further comprises a passive retarder.  
     
     
         15 . The display according to  claim 3 , wherein the one or more retarders further comprises a passive retarder.  
     
     
         16 . The display according to  claim 4 , wherein one or more retarders disposed on a light output side of the ferroelectric liquid crystal display further comprises a passive retarder.  
     
     
         17 . The display according to  claim 2 , wherein the actively controlled liquid crystal retarder is a half-wave retarder and the ferroelectric liquid crystal display comprises a quarter-wave retarders.  
     
     
         18 . The display according to  claim 4 , wherein each of the actively controlled liquid crystal retarders is a half-wave retarder and the ferroelectric liquid crystal display comprises a half-wave retarder.  
     
     
         19 . The display according to  claim 10 , wherein the at least one nematic liquid crystal retarder is a half-wave retarder and the ferroelectric liquid crystal display comprises a quarter-wave retarder.  
     
     
         20 . The display according to  claim 10 , wherein a passive retarder is disposed between the at least one nematic liquid crystal retarder the ferroelectric liquid crystal display.

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