Luminance control for illumination devices
First Claim
1. An illumination device, comprising:
- one or more illumination LEDs configured to provide illumination for the illumination device;
at least one reference LED configured to provide illumination only during test times of the illumination device;
driver circuitry coupled to the one or more illumination LEDs and the at least one reference LED;
light detector circuitry configured during the test times to detect light from the one or more illumination LEDs and the at least one reference LED; and
control circuitry coupled to the light detector circuitry and to the driver circuitry, the control circuitry being configured to utilize a—
comparison of light detected from the reference LED and light detected from the one or more illumination LEDs to adjust a brightness of the illumination device through control of the driver circuitry.
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Accused Products
Abstract
An illumination device is provided having one or more illumination LEDs configured to provide illumination for the device. Along with the illumination LED is a reference LED. The illumination LED provide illumination during normal operation of the device, whereas the reference LED provides a reference illumination, but does not provide illumination during normal operation. A light detector can detect light from the illumination LED and the reference LED, and control circuitry can be used to compare light detected from the reference LED and the illumination LED to adjust a brightness for the device. The light detector can comprise a photo-detector or can comprise an LED, such as one of the illumination LEDs if more than one illumination LED is utilized. A method is also provided for controlling brightness of an illumination device.
206 Citations
20 Claims
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1. An illumination device, comprising:
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one or more illumination LEDs configured to provide illumination for the illumination device; at least one reference LED configured to provide illumination only during test times of the illumination device; driver circuitry coupled to the one or more illumination LEDs and the at least one reference LED; light detector circuitry configured during the test times to detect light from the one or more illumination LEDs and the at least one reference LED; and control circuitry coupled to the light detector circuitry and to the driver circuitry, the control circuitry being configured to utilize a—
comparison of light detected from the reference LED and light detected from the one or more illumination LEDs to adjust a brightness of the illumination device through control of the driver circuitry. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for controlling a brightness of an illumination device, comprising:
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detecting light produced by a reference LED of the illumination device, wherein the reference LED only produces light during test times and not during normal illumination operation of the illumination device; detecting light produced by one or more illumination LEDs of the illumination device; comparing the light produced by the reference LED to the light produced by the one or more illumination LEDs; and adjusting the brightness of the illumination device based upon the comparing step. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification