Method and apparatus for controlling driving current of illumination source in a display system
DCFirst Claim
1. A display system comprising:
- a liquid crystal display panel having at least one backlight illumination source; and
a current controller coupled to the at least one illumination source, wherein the current controller includes;
a comparator configured to compare a first electrical parameter with a second electrical parameter, wherein the first electrical parameter corresponds to a programmable reference driving current for the at least one illumination source and the second electrical parameter corresponds to an operating driving current of the at least one illumination source; and
a current regulator configured to regulate the operating driving current of the at least one illumination source according to a driving bias current corresponding 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
11 Claims
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1. A display system comprising:
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a liquid crystal display panel having at least one backlight illumination source; and a current controller coupled to the at least one illumination source, wherein the current controller includes; a comparator configured to compare a first electrical parameter with a second electrical parameter, wherein the first electrical parameter corresponds to a programmable reference driving current for the at least one illumination source and the second electrical parameter corresponds to an operating driving current of the at least one illumination source; and a current regulator configured to regulate the operating driving current of the at least one illumination source according to a driving bias current corresponding to a difference between the first and second electrical parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A display system comprising:
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a liquid crystal display panel having at least one backlight illumination source; and a programmable current controller coupled to the at least one illumination source, comprising; a programmable interface configured to program a digital reference corresponding to the reference driving current in a memory; 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; wherein the programmable current controller is configured to regulate an operating driving current of the at least one illumination source according to a difference between the operating driving current and a programmable reference driving current for the at least one illumination source. - View Dependent Claims (10, 11)
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Specification