US4828365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicolor filter for producing purer white across a display device
Assignee: RCA Licensing Corp
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Filing: 1988-02-22
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Granted: 1989-05-09
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Expires: 2008-02-22
Abstract
Abstract A multicolor filter for a display device includes separate filter elements for individually providing the primary colors of light. The areas of the filter elements are tailored in accordance with the percentages of primary light colors in pure white light, the percentages of primary light in the illuminating source, and the light transmission capabilities of the filter elements. Additionally, the filter elements are configured so that the centroid of the filter elements are within the close proximity of a straight line passing through adjacent filter elements.
Inventors
- 👤 Roger G. Stewart
- 👤 Alfred C. Ipri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:48
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/30; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; G02F2201/00; G02F2201/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A multicolor filter for a display device illuminated by a light source comprising: a plurality of filter elements for providing the primary light colors, each of said filter elements having an area tailored in accordance with the percentages of primary light colors in pure white light, the actual percentages of primary light colors in said light source, and a compensated transmission factor related to the light transmission capabilities of said filter elements.
Claim 2
Dependent Claim
72 words
A multicolor filter for a display device illuminated by a light source comprising: a plurality of filter elements for providing the primary light colors, each of said filter elements having an area tailored in accordance with the percentages of primary light colors in pure white light, the actual percentages of primary light colors in said light source, and a compensated transmission factor related to the light transmission capabilities of said filter elements.
Claim 3
Dependent Claim
74 words
The filter of claim 1 wherein said filter element areas are selected in accordance with the expression: ##EQU2## where: A=Compensated area of a particular color filter element PWP=Percentage of a color in pure white light AP=Actual percentage of the color in the light source CTF=Compensated transmission factor of the filter element; the CTF for each color is the actual transmission efficiency of that color divided by the average transmission efficiency for all the colors.
Claim 4
Dependent Claim
42 words
The filter of claim 2 wherein said filter elements are arranged in triads and are configured wherein the centroids of filter elements in each triad and in adjacent triads lie in the proximity of a straight line passing through adjacent filter elements.
Claim 5
Dependent Claim
42 words
The filter of claim 1 wherein said filter elements are arranged in triads and are configured wherein the centroids of filter elements in each triad and in adjacent triads lie in the proximity of a straight line passing through adjacent filter elements.
Claim 6
Dependent Claim
42 words
The filter of claim 1 wherein each of said filter elements has an individual light transmission capability and an area selected wherein the ratio of the light transmission capabilities and the areas for each of said filter elements is substantially the same.
Claim 7
Dependent Claim
42 words
The filter of claim 5 wherein said filter elements are arranged in triads and are configured wherein the centroids of filter elements in each triad and in adjacent triads lie in the proximity of a straight line passing through adjacent filter elements.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |