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1. (WO2008008943) SYSTEM AND METHOD FOR PREDICTIVE PULSE MODULATION IN DISPLAY APPLICATIONS
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CLAIMS
What is claimed is:
1. A method for characterizing a light source, the method comprising:
sampling a light output of the light source;
computing a usage history of the light source; and
processing the samples of the light output together with the usage history to characterize the light source.
2. The method of Claim 1, wherein the usage history is computed from a waveform used to drive the light source, and wherein the usage history indicates an operating temperature associated with the light source.
3. The method of Claim 2, wherein the waveform is a drive-current waveform comprising a sequence of current pulses, and wherein computing the usage history comprises calculating an amount of current provided to the light source since a beginning of a present current pulse.
4. The method of any of Claims 1 -3, wherein the processing comprises:
integrating samples of the light output;
differentiating samples of the light output; and
computing a light response of the light source based on the integrated samples of light and the differentiated samples of light.
5. The method of Claim 4, wherein computing the light response comprises correcting the integrated samples of light and the differentiated samples of light with respect to the usage history; and computing a set of coefficients to fit a curve to the corrected samples of the light output.
6. The method of Claim 5, wherein the curve comprises an equation selected from the group consisting of: a sum of exponentials of differing order, a sum of single exponentials of a single order, a polynomial, or combinations thereof.
7. A method for driving a light source, the method comprising:
receiving a set of specifications for a desired light output;
using characterization information for the light source to derive a current waveform; and
providing the current waveform to the light source.
8. The method of Claim 7, further comprising, after the using, interpolating the characterization information in response to a determination that the characterization information does not substantially match the set of specifications.
9. The method of Claim 7 or 8, wherein the characterization information is created by:
sampling a light output of the light source;
computing a usage history of the light source; and
processing the samples of the light output in combination with the usage history to characterize the light source.
10. A display system comprising:
a solid-state light source for emitting radiation in response to a current waveform provided to the solid-state light source;
an array of light modulators optically coupled to the solid-state light source, the array of light modulators configured to modulate light from the solid-state light source based upon image data to produce images on a display plane;
a sequence controller coupled to the array of light modulators, the sequence controller configured to issue commands to control the operation of the array of light modulators;
an optoelectrical converter optically coupled between the solid-state light source and the array of light modulators, the optoelectrical converter configured to periodically sample light produced by the solid-state light source and convert the samples into electric signals; and
a processor coupled between the optoelectrical converter and the solid-state light source, the processor configured to create a characterization of the solid-state light source utilizing the electrical signals provided by the optoelectrical converter.
11. The display system of Claim 10, further comprising a memory coupled to the sequence controller, the memory configured to store the characterization of the solid-state light source; and wherein the sequence controller retrieves from the memory the characterization of the solid-state light source based on a desired light output from the solid-state light source and uses the characterization to determine a current waveform to provide to the solid-state light source.