CALIBRATION OF DISPLAYS HAVING SPATIALLY-VARIABLE BACKLIGHT
First Claim
1. A method for calibrating a display comprising an array of individually-controllable light sources coupled to a controller, the individually-controllable light sources configured to emit light when supplied with electrical current under control of the controller in response to image data, the method comprising:
- collecting at least a portion of light emitted by one light source of the plurality of light sources;
receiving a collected light signal representative of the collected light;
comparing the collected light signal to expected light characteristics; and
,if the comparison indicates that an intensity of the collected light is different from an expected intensity indicated by the expected light characteristics, determining an intensity correction for the one light source, the intensity correction comprising an indication to alter a duty cycle of pulses of electrical current supplied to the one light source by the controller.
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Accused Products
Abstract
A display has a screen which incorporates a light modulator. The screen may be a front projection screen or a rear-projection screen. The screen is illuminated with light from an illuminator comprising an array of individually-controllable light sources. The light sources and elements of the light modulator may be controlled to adjust the intensity and frequency of light emanating from corresponding areas on the screen. The display may be calibrated to compensate for differences in intensities of the light sources.
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Citations
34 Claims
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1. A method for calibrating a display comprising an array of individually-controllable light sources coupled to a controller, the individually-controllable light sources configured to emit light when supplied with electrical current under control of the controller in response to image data, the method comprising:
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collecting at least a portion of light emitted by one light source of the plurality of light sources; receiving a collected light signal representative of the collected light; comparing the collected light signal to expected light characteristics; and
,if the comparison indicates that an intensity of the collected light is different from an expected intensity indicated by the expected light characteristics, determining an intensity correction for the one light source, the intensity correction comprising an indication to alter a duty cycle of pulses of electrical current supplied to the one light source by the controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for calibrating a display comprising a screen backlit by an array of individually-controllable light sources coupled to a controller, each of the individually-controllable light sources configured to emit light when supplied with electrical power under control of the controller in response to image data, the method comprising:
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collecting at least a portion of light emitted by one light source of the plurality of light sources; receiving a collected light signal representative of the collected light; comparing the collected light signal to expected light characteristics; and
,if the comparison indicates that a color temperature of the collected light is different from an expected color temperatue indicated by the expected light characteristics, determining a color correction for the one light source. - View Dependent Claims (27, 28, 29)
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30. A method for calibrating a display comprising an array of individually-controllable LEDs coupled to a controller, each of the individually-controllable LEDs configured to emit light when supplied with electrical power under control of the controller in response to image data, the method comprising:
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supplying electrical power to one LED of the plurality of LEDs; measuring a current induced in at least one other LED upon which light emitted from the one LED is incident; comparing the measured current to an expected current; and
,if the comparison indicates that the intensity of light emitted from the one LED is different from an expected intensity of light emitted from the one LED, determining an intensity correction for the one LED. - View Dependent Claims (31, 32, 33)
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34. A method for calibrating a display comprising a modulator backlit by an array of individually-controllable light sources coupled to a controller, the individually-controllable light sources configured to emit light when supplied with electrical current under control of the controller in response to image data, the method comprising:
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collecting at least a portion of light emitted by one light source of the plurality of light sources; receiving a collected light signal representative of the collected light; comparing the collected light signal to expected light characteristics; and
,if the comparison indicates that an intensity of the collected light is different from an expected intensity indicated by the expected light characteristics, determining an intensity correction for the one light source, the intensity correction comprising an indication to adjust an intensity of at least one neighboring light source and to adjust transmission characteristics of a corresponding section of the modulator.
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Specification