US5298993A
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Display calibration
Assignee: MediaTek Inc
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Filing: 1992-06-15
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Granted: 1994-03-29
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Expires: 2012-06-15
Abstract
Abstract Apparatus and method for calibrating a display, such as a raster display, copier, liquid crystal display (LCD) or a printer is disclosed. The processor, under the control of an algorithm, generates adjustment images with a symbol that appears light on dark when misadjusted in one direction; dark on light when misadjusted the other way; and disappears at the point when the display is adjusted correctly. The invention can be used to calibrate brightness, color, gamma and sharpness.
Inventors
- 👤 Albert D. Edgar
- 👤 James M. Kasson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
H; H04; H04N; H04N17/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
58 words
An apparatus for detecting characteristics of a display, comprising: (a) means for displaying a grid pattern; (b) means for displaying a grid having a continuous tone field adjacent to the grid pattern; and (c) means for varying frequency response of the display until the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 2
Independent Claim
58 words
An apparatus for detecting characteristics of a display, comprising: (a) means for displaying a grid pattern; (b) means for displaying a grid having a continuous tone field adjacent to the grid pattern; and (c) means for varying frequency response of the display until the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 3
Dependent Claim
25 words
Apparatus as recited in claim 1, wherein the grid pattern blends with the grid having a continuous tone field when the display is properly calibrated.
Claim 4
Dependent Claim
14 words
Apparatus as recited in claim 1, including means for adjusting brightness of the display.
Claim 5
Dependent Claim
13 words
Apparatus as recited in claim 1, including means adjusting contrast of the display.
Claim 6
Dependent Claim
14 words
Apparatus as recited in claim 1, including means for adjusting sharpness of the display.
Claim 7
Dependent Claim
14 words
Apparatus as recited in claim 1, wherein the display is a liquid crystal display.
Claim 8
Dependent Claim
13 words
Apparatus as recited in claim 1, wherein the display is a raster display.
Claim 9
Dependent Claim
12 words
Apparatus as recited in claim 1, wherein the display is a printer.
Claim 10
Dependent Claim
12 words
Apparatus as recited in claim 1, wherein the display is a copier.
Claim 11
Independent Claim
55 words
A method for detecting characteristics of a display, comprising the steps of: (a) displaying a grid pattern; (b) displaying a grid having a continuous tone field adjacent to the grid pattern; and (c) varying frequency response of the display until the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 12
Independent Claim
55 words
A method for detecting characteristics of a display, comprising the steps of: (a) displaying a grid pattern; (b) displaying a grid having a continuous tone field adjacent to the grid pattern; and (c) varying frequency response of the display until the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 13
Dependent Claim
26 words
A method as recited in claim 9, wherein the grid pattern blends with the grid having a continuous tone field when the display is properly calibrated.
Claim 14
Dependent Claim
16 words
A method as recited in claim 11, including the step of adjusting brightness of the display.
Claim 15
Dependent Claim
16 words
A method as recited in claim 11, including the step of adjusting contrast of the display.
Claim 16
Dependent Claim
16 words
A method as recited in claim 11, including the step of adjusting sharpness of the display.
Claim 17
Independent Claim
71 words
An apparatus for detecting characteristics of a display, comprising: (a) means for displaying a grid pattern consisting of alternating first and second tones along a scan direction of the display grouping first tones together; (b) means for displaying a grid having a continuous tone field adjacent to the grid pattern; and (c) means for detecting when the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 18
Independent Claim
71 words
An apparatus for detecting characteristics of a display, comprising: (a) means for displaying a grid pattern consisting of alternating first and second tones along a scan direction of the display grouping first tones together; (b) means for displaying a grid having a continuous tone field adjacent to the grid pattern; and (c) means for detecting when the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 19
Dependent Claim
35 words
An apparatus for detecting characteristics of a display as recited in claim 15, wherein pixels between the alternating, adjacent first and second tones along a scan direction of the display correspond to an intermediate tone.
Claim 20
Independent Claim
68 words
A method for detecting characteristics of a display, comprising the steps of: (a) displaying a grid pattern consisting of alternating first and second tones along a scan direction of the display grouping first tones together; (b) displaying a grid having a continuous tone field proximal to the grid pattern; and (c) detecting when the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 21
Independent Claim
68 words
A method for detecting characteristics of a display, comprising the steps of: (a) displaying a grid pattern consisting of alternating first and second tones along a scan direction of the display grouping first tones together; (b) displaying a grid having a continuous tone field proximal to the grid pattern; and (c) detecting when the grid pattern and the grid having a continuous tone field have the same brightness.
Claim 22
Dependent Claim
35 words
A method for detecting characteristics of a display as recited in claim 17, wherein pixels between the alternating, adjacent first and second tones along a scan direction of the display correspond to an intermediate tone.
Claim 23
Independent Claim
95 words
A method for detecting the density curve of a display, comprising the steps of: (a) displaying a grid pattern consisting of a first tone and a second tone; (b) displaying a third grid having a third tone adjacent to the grid pattern; (c) varying the third tone until the grid pattern and the third tone have the same brightness; (d) setting either the first tone or second tone equal to the third tone; and (e) varying the third tone until the grid pattern and the third grid having a third tone having the same brightness.
Claim 24
Independent Claim
95 words
A method for detecting the density curve of a display, comprising the steps of: (a) displaying a grid pattern consisting of a first tone and a second tone; (b) displaying a third grid having a third tone adjacent to the grid pattern; (c) varying the third tone until the grid pattern and the third tone have the same brightness; (d) setting either the first tone or second tone equal to the third tone; and (e) varying the third tone until the grid pattern and the third grid having a third tone having the same brightness.
Claim 25
Independent Claim
106 words
An apparatus for detecting the density curve of a display, comprising: (a) means for displaying a grid pattern consisting of a first tone and a second tone; (b) means for displaying a third grid having a third tone adjacent to the grid pattern; (c) means for varying the third tone until the grid pattern and the third grid having a third tone have the same brightness; (d) means for setting either the first tone or second tone equal to the third tone; and (e) means for varying the third tone until the grid pattern and the third grid having a third tone have the same brightness.
Claim 26
Independent Claim
106 words
An apparatus for detecting the density curve of a display, comprising: (a) means for displaying a grid pattern consisting of a first tone and a second tone; (b) means for displaying a third grid having a third tone adjacent to the grid pattern; (c) means for varying the third tone until the grid pattern and the third grid having a third tone have the same brightness; (d) means for setting either the first tone or second tone equal to the third tone; and (e) means for varying the third tone until the grid pattern and the third grid having a third tone have the same brightness.
Claim 27
Independent Claim
110 words
A method for detecting phase characteristics of a display, comprising the steps of: (a) displaying a first grid pattern consisting of alternating first and second tones along a scan direction of the display; (b) displaying a second grid consisting of alternating third and fourth tones along a scan direction of the display; (c) displaying intermediate tones between the transitions between first to second tones along a scan direction of the display in the first grid; (d) displaying intermediate tones between the transitions between third to fourth tones along a scan direction of the display in the second grid; and (e) detecting differences in brightness between the first and second grids.
Claim 28
Independent Claim
110 words
A method for detecting phase characteristics of a display, comprising the steps of: (a) displaying a first grid pattern consisting of alternating first and second tones along a scan direction of the display; (b) displaying a second grid consisting of alternating third and fourth tones along a scan direction of the display; (c) displaying intermediate tones between the transitions between first to second tones along a scan direction of the display in the first grid; (d) displaying intermediate tones between the transitions between third to fourth tones along a scan direction of the display in the second grid; and (e) detecting differences in brightness between the first and second grids.
Claim 29
Independent Claim
117 words
A method for detecting phase characteristics of a display, comprising: (a) means for displaying a first grid consisting of alternating first and second tones along a scan direction of the display; (b) means for displaying a second grid consisting of alternating third and fourth tones along a scan direction of the display; (c) means for displaying intermediate tones between the transitions between first to second tones along a scan direction of the display in the first grid; (d) means for displaying intermediate tones between the transition between third to fourth tones along a scan direction of the display in the second grid; and (e) means for detecting a difference in brightness between the first and second grids.
Claim 30
Independent Claim
117 words
A method for detecting phase characteristics of a display, comprising: (a) means for displaying a first grid consisting of alternating first and second tones along a scan direction of the display; (b) means for displaying a second grid consisting of alternating third and fourth tones along a scan direction of the display; (c) means for displaying intermediate tones between the transitions between first to second tones along a scan direction of the display in the first grid; (d) means for displaying intermediate tones between the transition between third to fourth tones along a scan direction of the display in the second grid; and (e) means for detecting a difference in brightness between the first and second grids.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-03-28 | 1997-09-27 | 1998-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-03-28 | 2001-09-27 | 2002-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-03-28 | 2005-09-27 | 2006-03-29 | $7700.00 | Window Closed / Lapsed |