US3609235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mask compensation for matrixed-element flat-panel television display
Assignee: Zenith Electronics LLC
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Filing: 1969-10-16
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Granted: 1971-09-28
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Expires: 1989-10-16
Abstract
Abstract A flat-panel television display of matrixed emitting, controlling or reflecting image elements which differ in light output per unit excitation is compensated by a mask having transmitting areas of a size and configuration corresponding to those of the image elements which vary inversely in transmissivity from area to area with the brightness of each corresponding display element.
Inventors
- 👤 Samuel P Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:05
CPC Classifications
H; H01; H01J; H01J17/00; H01J17/38; H01J17/48; H01J17/49; H01J17/492; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/125
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
In a television system wherein a flat imaging panel displays television image information visible from viewing locations in front of said imaging panel, the improvement which comprises: a plurality of discrete matrixed image display elements which together comprise said image display panel, said elements having nonuniform brightness characteristics from element to element for given excitation; and means for compensating said nonuniform brightness characteristics, comprising a mask which includes a plurality of matrixed image transmitting areas corresponding in size and configuration to said image display elements and is disposed between said matrixed elements and said viewing locations and in registration with said image elements, said mask having nonuniform light transmissivity from area to area, with the light transmissivity of said transmitting areas varying inversely from element to element with the relative brightness characteristics of said image elements, so that the mask compensates the display to provide a uniform net brightness over its entire area.
Claim 2
Dependent Claim
153 words
In a television system wherein a flat imaging panel displays television image information visible from viewing locations in front of said imaging panel, the improvement which comprises: a plurality of discrete matrixed image display elements which together comprise said image display panel, said elements having nonuniform brightness characteristics from element to element for given excitation; and means for compensating said nonuniform brightness characteristics, comprising a mask which includes a plurality of matrixed image transmitting areas corresponding in size and configuration to said image display elements and is disposed between said matrixed elements and said viewing locations and in registration with said image elements, said mask having nonuniform light transmissivity from area to area, with the light transmissivity of said transmitting areas varying inversely from element to element with the relative brightness characteristics of said image elements, so that the mask compensates the display to provide a uniform net brightness over its entire area.
Claim 3
Dependent Claim
21 words
The improvement as in claim 1, in which said mask is in surface contact with said matrixed plurality of display elements.
Claim 4
Dependent Claim
15 words
The improvement as in claim 1, in which said mask is a photographic film transparency.
References Cited (Backward Citations)
US2721900A
Cited
US2726351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |