Display calibration
First Claim
Patent Images
1. 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.
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Accused Products
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.
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Citations
22 Claims
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1. An apparatus for detecting characteristics of a display, comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14)
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10. A method for detecting characteristics of a display, comprising the steps of:
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(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.
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15. An apparatus for detecting characteristics of a display, comprising:
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(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. - View Dependent Claims (16)
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17. A method for detecting characteristics of a display, comprising the steps of:
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(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. - View Dependent Claims (18)
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19. A method for detecting the density curve of a display, comprising the steps of:
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(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.
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20. An apparatus for detecting the density curve of a display, comprising:
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(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.
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21. A method for detecting phase characteristics of a display, comprising the steps of:
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(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.
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22. A method for detecting phase characteristics of a display, comprising:
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(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.
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Specification