Illumination brightness and color control system and method therefor
AssigneeIndustrial Technology Research Institute
InventorsJui-Feng Huang, Chun-Te Lu
Life of this patent
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Abstract
An illumination brightness and color control system for adjusting the illumination of a plurality of point light sources and method therefor are provided, implemented in a time division manner. A single photosensor senses and samples a point light source for the luminous intensity signal value. Then, the luminous intensity signal value at each wavelength and a target brightness/color value are compute to acquire a corrected current value, and the corrected current value is fed back to a light source driver. Therefore, the brightness/color value of the point light sources is adjusted to be in a steady state.
Claims9
An illumination brightness and color control system, for adjusting the illumination brightness of a plurality of point light sources according to a target brightness and color value, comprising:
- a timing sampling controller, for adjusting a control timing and a sampling timing of each point light source, and generating a plurality of control timings, wherein each control timing is different;
- a light source driver, for generating a driving current in response to each control timing, so as to drive the corresponding point light sources, thus the point light sources emit lights at different times;
- a broadband light source monitor, for sensing and sampling the point light sources that emit lights at a specific time for a luminous intensity signal value in response to the sampling timing;
- a computing unit, for computing and acquiring a corrected current value according to the difference between the brightness/color value and the sensed luminous intensity signal value;
- and
- a current adjuster, for adjusting the driving current generated by the light source driver according to the corrected current value.
An illumination brightness and color control method, for setting a control timing and a sampling timing, sensing a point light source with a single broadband photosensor, and feedback controlling the illumination brightness of the point light source, comprising:
- generating a driving current in response to the control timing, to drive the point light source to emit lights at different times;
- sensing and sampling the point light source that emits lights at a specific time for a luminous intensity signal value in response to the sampling timing;
- computing a difference between the luminous sensed intensity signal value and a target brightness/color value, so as to acquire a corrected current value;
- and
- correcting the driving current according to the corrected current value, so as to adjust the illumination brightness.
Dependencies are inferred from the claim text.