US4982287A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of brightness level adapted to control of contrast
Assignee: RCA Licensing Corp
•
Filing: 1989-11-01
•
Granted: 1991-01-01
•
Expires: 2009-11-01
Abstract
Abstract A level setting apparatus for adjusting the brightness of a television receiver is modified by the setting of an amplitude control apparatus for adjusting the contrast such that the maximum brightness level of the image on a CRT is modified in direct relationship to the adjusted level of contrast.
Inventors
- 👤 William A. Lagoni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:42
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77; H04N5/00; H04N5/44; H04N5/57; H04N5/59
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
149 words
In a television receiver including a source of video signal a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of a reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximum contrast level and a minimum contrast level, and means coupled to said contrast control means and said brightness control means for controlling said maximum brightness level in direct relationship to the adjusted level of contrast.
Claim 2
Dependent Claim
149 words
In a television receiver including a source of video signal a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of a reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximum contrast level and a minimum contrast level, and means coupled to said contrast control means and said brightness control means for controlling said maximum brightness level in direct relationship to the adjusted level of contrast.
Claim 3
Dependent Claim
23 words
The television receiver of claim 1 wherein the means coupled to said brightness control means and contrast control means comprises a non-linear device.
Claim 4
Dependent Claim
23 words
The television receiver of claim 1 wherein at least one of the brightness control means and the contrast control means comprises potentimeter means.
Claim 5
Dependent Claim
23 words
The television receiver of claim 3 wherein the means coupled to said brightness control means and contrast control means comprises a non-linear device.
Claim 6
Dependent Claim
25 words
The television receiver of claim 1 wherein at least one of the brightness control means and the contrast control means comprises a digital switching means.
Claim 7
Dependent Claim
15 words
The television receiver of claim 5 wherein the digital switching means comprises a digital-to-analog converter.
Claim 8
Dependent Claim
23 words
The television receiver of claim 6 wherein the means coupled to said brightness control means and contrast control means comprises a non-linear device.
Claim 9
Dependent Claim
26 words
The television receiver of claim 1 wherein the means coupled to said brightness control means and contrast control means comprises a software controlled digital processing means.
Claim 10
Dependent Claim
16 words
The television receiver of claim 8 wherein the software controlled digital processing means comprises a microprocessor.
Claim 11
Dependent Claim
34 words
The television receiver of claim 1 wherein the brightness control means, contrast control means, and means coupled to the contrast control means and the brightness control means comprise a software controlled digital processing means.
Claim 12
Dependent Claim
16 words
The television receiver of claim 10 wherein the software controlled digital processing means comprises a microprocessor.
Claim 13
Dependent Claim
137 words
In a television receiver including a source of video signal, a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximum contrast level and a minimum contrast level, and means for changing the maximum brightness level in direct relationship to the adjusted level of contrast.
Claim 14
Dependent Claim
137 words
In a television receiver including a source of video signal, a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximum contrast level and a minimum contrast level, and means for changing the maximum brightness level in direct relationship to the adjusted level of contrast.
Claim 15
Dependent Claim
15 words
The television receiver of claim 12 wherein the means for changing comprises a non-linear device.
Claim 16
Dependent Claim
23 words
The television receiver of claim 12 wherein at least one of the brightness control means and the contrast control means comprises potentiometer means.
Claim 17
Dependent Claim
15 words
The television receiver of claim 14 wherein the means for changing comprises a non-linear device.
Claim 18
Dependent Claim
24 words
The television receiver of claim 12 wherein at least one of the brightness control means and the contrast control means comprises digital switching means.
Claim 19
Dependent Claim
15 words
The television receiver of claim 16 wherein the digital switching means comprises a digital-to-analog converter.
Claim 20
Dependent Claim
15 words
The television receiver of claim 17 wherein the means for changing comprises a non-linear device.
Claim 21
Dependent Claim
18 words
The television receiver of claim 12 wherein the means for changing comprises a software controlled digital processing means.
Claim 22
Dependent Claim
16 words
The television receiver of claim 19 wherein the software controlled digital processing means comprises a microprocessor.
Claim 23
Dependent Claim
25 words
The television receiver of claim 12 wherein the brightness control means, contrast control means, and means for changing comprise a software controlled digital processing means.
Claim 24
Dependent Claim
16 words
The television receiver of claim 21 wherein the software controlled digital processing means comprises a microprocessor.
Claim 25
Dependent Claim
163 words
In a television receiver including a source of video signal, a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of a reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximu contrast level and a minimum contrast level, and means for changing the maximum brightness level in direct relationship to the adjusted level of contrast, the means for changing comprising a non-linear device, at least one of the brightness control means and the contrast control means comprising a digital-to-analog converter.
Claim 26
Dependent Claim
163 words
In a television receiver including a source of video signal, a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of a reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximu contrast level and a minimum contrast level, and means for changing the maximum brightness level in direct relationship to the adjusted level of contrast, the means for changing comprising a non-linear device, at least one of the brightness control means and the contrast control means comprising a digital-to-analog converter.
Claim 27
Dependent Claim
207 words
In a television receiver including a source of a video signal, a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of a reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximum contrast level and a minimum contrast level, means coupled to said contrast control means and said brightness control means for controlling said maximum brightness level in direct relationship to the adjusted level of contrast, and beam limiting means coupled to the visual display and at least one of the contrast processing means and the brightness processing means for sensing the beam current in the visual display device and reducing the beam current above a predetermined threshold by effecting the at least one of the contrast processing means and the brightness processing means.
Claim 28
Dependent Claim
207 words
In a television receiver including a source of a video signal, a visual display device, and process means for processing said video signal before application to said visual display device including contrast processing means for controlling the contrast of a reproduced image and brightness processing means for controlling the brightness of the reproduced image, a control system comprising: brightness control means coupled to said brightness processing means for adjusting the brightness of said reproduced image to a desired brightness level between a maximum brightness level and a minimum brightness level, contrast control means coupled to said contrast processing means for adjusting the contrast of said reproduced image to a desired contrast level between a maximum contrast level and a minimum contrast level, means coupled to said contrast control means and said brightness control means for controlling said maximum brightness level in direct relationship to the adjusted level of contrast, and beam limiting means coupled to the visual display and at least one of the contrast processing means and the brightness processing means for sensing the beam current in the visual display device and reducing the beam current above a predetermined threshold by effecting the at least one of the contrast processing means and the brightness processing means.
References Cited (Backward Citations)
US3804981A
Cited
US3928867A
Cited
US3961361A
Cited
US4091419A
Cited
US4126884A
Cited
US4506292A
Cited
US4520397A
Cited
US4587554A
Cited
US4654717A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |