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US5905541A
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Television picture image processing apparatus
Assignee: SK Hynix Inc
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Filing: 1996-10-04
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Granted: 1999-05-18
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Expires: 2016-10-04
Abstract
Abstract A television picture image processing apparatus includes a horizontal edge gate pulse generator, a vertical edge gate pulse generator, an AND combiner for ANDing horizontal and vertical edge gate pulses applied thereto respectively from the horizontal and the vertical edge gate pulse generators, a sawtooth pulse generator, an amplifier for controlling the gain of sawtooth pulses from the sawtooth pulse generator in accordance with an external DC voltage, and a luminance processor. The apparatus prevents picture quality of a television set from being degraded due to a poor contrast and brightness occurring in each corner of a television picture screen.
Inventors
- 👤 Hyung Sik Yun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:40
CPC Classifications
H; H04; H04N; H04N3/00; H04N3/10; H04N3/16; H04N3/26; H04N5/00; H04N5/44; H04N5/57
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
An image processing apparatus, comprising: a horizontal edge gate pulse generator for generating a plurality of horizontal edge gate pulses corresponding to corner regions of a picture screen; a vertical edge gate pulse generator for generating a plurality of vertical edge gate pulses based on the plurality of horizontal edge pulses; a combiner for combining the horizontal edge gate pulses and vertical edge gate pulses from the horizontal and the vertical edge gate pulse generators to generate a combined gate pulse signal; a sawtooth pulse generator for converting the combined gate pulse signal from the combiner into a sawtooth pulse signal corresponding to said corner regions of the picture screen; an amplifier for controlling a gain of the sawtooth pulse signal from the sawtooth pulse generator in accordance with an external DC voltage; and a luminance processor for compensating a picture quality in each of said comer regions of the picture screen in accordance with the sawtooth pulse signal output from the amplifier.
Claim 2
Dependent Claim
163 words
An image processing apparatus, comprising: a horizontal edge gate pulse generator for generating a plurality of horizontal edge gate pulses corresponding to corner regions of a picture screen; a vertical edge gate pulse generator for generating a plurality of vertical edge gate pulses based on the plurality of horizontal edge pulses; a combiner for combining the horizontal edge gate pulses and vertical edge gate pulses from the horizontal and the vertical edge gate pulse generators to generate a combined gate pulse signal; a sawtooth pulse generator for converting the combined gate pulse signal from the combiner into a sawtooth pulse signal corresponding to said corner regions of the picture screen; an amplifier for controlling a gain of the sawtooth pulse signal from the sawtooth pulse generator in accordance with an external DC voltage; and a luminance processor for compensating a picture quality in each of said comer regions of the picture screen in accordance with the sawtooth pulse signal output from the amplifier.
Claim 3
Dependent Claim
70 words
The apparatus of claim 1, wherein the horizontal edge gate pulse generator includes; a voltage controlled oscillator for generating a plurality of pulse signals have a predetermined frequency, a horizontal count-down unit for counting down the pulse signals output from the voltage controlled oscillator to reach a predetermined horizontal count-down value, and a combination logic unit for producing the horizontal edge gate pulses in accordance with the horizontal count-down value.
Claim 4
Dependent Claim
56 words
The apparatus of claim 2, wherein the vertical edge gate pulse generator includes: a vertical count-down unit for vertically counting down a pulse signal output from the horizontal count-down unit to reach a predetermined vertical count-down value, and a combination logic unit for producing the vertical edge gate pulses in accordance with the vertical count-down value.
Claim 5
Dependent Claim
28 words
The apparatus of claim 1, wherein the luminance processor receives a luminance signal and increases a gain of the luminance signal in accordance with the sawtooth pulse signal.
Claim 6
Dependent Claim
25 words
The apparatus of claim 4, wherein the sawtooth pulse signal includes sawtooth pulses, each corresponding to one of said comer regions of the picture screen.
Claim 7
Dependent Claim
35 words
The apparatus of claim 1, wherein the luminance processor includes a DC voltage bias unit which increases a gain of a luminance signal input thereto according to the sawtooth pulse signal output from the amplifier.
Claim 8
Dependent Claim
25 words
The apparatus of claim 1, wherein the plurality of horizontal and vertical edge gate pulses are rectangular pulses, and the combiner combines these rectangular pulses.
Claim 9
Dependent Claim
33 words
The apparatus of claim 1, wherein the plurality of horizontal edge gate pulses generated by the horizontal edge gate pulse generator correspond to horizontal positions of said corner regions of the picture screen.
Claim 10
Dependent Claim
33 words
The apparatus of claim 8, wherein the plurality of vertical edge gate pulses generated by the vertical edge gate pulse generator correspond to vertical positions of said corner regions of the picture screen.
Claim 11
Dependent Claim
24 words
The apparatus of claim 1, wherein the combiner generates the combined gate pulse signal which correspond to said comer regions of the picture screen.
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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) | 2002-05-17 | 2002-11-16 | 2003-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-05-17 | 2006-11-16 | 2007-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-05-17 | 2010-11-16 | 2011-05-18 | $7700.00 | Window Closed / Lapsed |