Color calibration for LCD panel
First Claim
1. A method of correcting video output which is electronically transmitted from a source external to a display device, the video output including at three components corresponding to three colors, comprising the steps of:
- generating, at the source comprising interchangeable personal computers of different manufacture, a test pattern having three electrical signals corresponding to the three colors;
determining the differences between a predetermined signal level and the signal level of each of the three color signals; and
calibrating the video output by adjusting the video output based on each of the differences.
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Accused Products
Abstract
A presentation system uses a computer to store and transmit electronic images to a liquid crystal display (LCD) panel which rests on an overhead projector. The LCD panel includes a calibration circuit designed to correct discrepancies in the saturation levels of the three primary colors. The calibration circuit determines the digital values in a signal corresponding to a test pattern of maximum intensity for all three colors, and compares these values to predetermined theoretical values. The differences between these values are recorded as calibration constants and are used to correct the image signals transmitted from the computer. A remote control unit may be used to provide a stimulus to both the computer (to generate the test pattern) and the LCD panel (to execute the calibration process).
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Citations
20 Claims
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1. A method of correcting video output which is electronically transmitted from a source external to a display device, the video output including at three components corresponding to three colors, comprising the steps of:
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generating, at the source comprising interchangeable personal computers of different manufacture, a test pattern having three electrical signals corresponding to the three colors; determining the differences between a predetermined signal level and the signal level of each of the three color signals; and calibrating the video output by adjusting the video output based on each of the differences. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for visually presenting an electronically stored image based on electronic video output from an external source comprising interchangeable personal computers of different manufacture having three components in analog form, corresponding to three colors, comprising:
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means for converting analog voltage levels into digital values; correction means, electrically connected to said converting means, for (i) determining three digital reference values, one for each of the three colors, corresponding to three electrical reference video signals transmitted from the external source, respectively, (ii) recording the differences, respectively, between a predetermined digital value and said digital reference values, and (iii) calibrating each of the three components in the video output based on said differences, respectively, resulting in calibrated digital values; video memory means for temporarily storing said calibrated digital values; display means electrically connected to said video memory means for visually reproducing the electronically stored image; means electrically connected to said video memory means and said display means for controlling output from said video memory means to said display means. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. In a presentation system having an external source for transmitting three analog image signals, corresponding to the primary colors of an electronically stored color image, to a display device having means for reproducing the image, the improvement comprising:
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means, in said source comprising interchangeable personal computers of different manufacture, for generating a test pattern having three electrical analog reference signals of maximum intensity, one for each of said primary colors; means, in said display device, for converting analog voltage levels into digital values; correction means, in said display device, electrically connected to said converting means and said reproducing means, for (i) determining three digital reference values corresponding to said three analog reference signals, respectively, (ii) recording the differences, respectively, between a predetermined digital value and said digital reference values, and (iii) calibrating each of said three analog image signals based on said differences, respectively. - View Dependent Claims (17, 18, 19, 20)
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Specification