Method and apparatus for controlling driving current of illumination source in a display system
DCFirst Claim
1. A programmable current controller comprising:
- a programmable interface configured to program a digital reference in a memory, wherein the digital reference corresponds to a predetermined driving current for at least one illumination source;
a digital-to-analog converter coupled to the programmable interface and configured to convert the digital reference into a first electrical parameter;
a comparator coupled to the programmable interface and configured tocompare the first electrical parameter with a second electrical parameter corresponding to the operating driving current of the at least one illumination source, andgenerate a driving bias current; and
a current regulator coupled to the comparator and configured toregulate the operating driving current of the at least one illumination source according to the driving bias current, wherein the driving bias current corresponds to a difference between the first and second electrical parameters.
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Abstract
The present application describes a programmable current controller for regulating an operating driving current flowing through an illumination source. The driving current is regulated according to a digital reference corresponding to a predetermined operating current for the illumination source. The digital reference can be converted into a reference electrical parameter (current or voltage). The reference electrical parameter is compared with an operating electrical parameter (current or voltage) corresponding to the operating driving current of the illumination source. Based on the comparison, a driving bias current is generated, which is used to regulate the operating driving current of the illumination source.
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Citations
10 Claims
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1. A programmable current controller comprising:
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a programmable interface configured to program a digital reference in a memory, wherein the digital reference corresponds to a predetermined driving current for at least one illumination source; a digital-to-analog converter coupled to the programmable interface and configured to convert the digital reference into a first electrical parameter; a comparator coupled to the programmable interface and configured to compare the first electrical parameter with a second electrical parameter corresponding to the operating driving current of the at least one illumination source, and generate a driving bias current; and a current regulator coupled to the comparator and configured to regulate the operating driving current of the at least one illumination source according to the driving bias current, wherein the driving bias current corresponds to a difference between the first and second electrical parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification