Industry Patents
Patent: 6882384
Color Filters and Sequencers Using Color Selective Light Modulators
(Click image for PDF of full patent)
| Patent Number: |
6882384 |
| Title: |
Color Filters and Sequencers Using Color Selective Light Modulators |
| Abstract: |
The present invention provides a high brightness color selective light
modulator (CSLM) formed by a polarization modulator positioned between two
retarder stacks. The modulator changes the apparent orientation of one
retarder stack relative to the other so that, in a first switching state
of the modulator the two retarder stacks cooperate in filtering the
spectrum of input light, and in a second switching state the two retarder
stacks complement each other, yielding a neutral transmission spectrum.
Two or more CSLM stages can be used in series, each stage providing
independent control of a primary color. One preferred embodiment
eliminates internal polarizers between CSLM stages, thereby providing an
additive common-path full-color display with only two neutral polarizers.
Hybrid filters can be made using the CSLMs of this invention, in
combination with other active or passive filters. The CSLMs of this
invention can be used in many applications, particularly in the areas of
recording and displaying color images. They can be arranged in a multi
pixel array by pixelating the active elements, and can be implemented as
color filter arrays, using patterned passive retarders rather than active
polarization modulators.
|
| Country of Issue: |
US |
| First Named Inventor: |
Sharp |
| Assignee: |
ColorLink |
| Continuation or Divisional of: |
5822021 |
| International Classification: |
G02G 1/1347 |
| US Classification: |
349/78 |
| Issue Date: |
04-19-2005 |
| Filing Date: |
07-31-1998 |
| Application : |
09/126330 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
6882384 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6882384 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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