White point adjustment for multicolor keyboard backlight
First Claim
1. A method of operating a back lighting system of a keyboard comprising:
- actuating a light sensor to sense ambient light through at least one key on said keyboard;
determining a white point of the sensed ambient light;
determining a constant contrast ratio of the sensed ambient light and a non-illuminated surface;
actuating a multicolor light source to dynamically provide a desired white point output through a light distribution network associated with said at least one key, said desired white point output approximately equal to the determined white point of the sensed ambient light; and
adjusting a brightness output of the light source based on the constant contrast ratio, said constant contrast ratio including a ratio of the sensed ambient light to a brightness of said light source.
1 Assignment
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Accused Products
Abstract
There are provided systems, devices and methods for operating a light source to match a white point of ambient light. In one embodiment, a light control system is provided. The light control system includes a light source and a light sensor. The light sensor is configured to operate in conjunction with the light source to provide a visual effect. A controller is electrically coupled to the light source and the light sensor and configured to determine the intensity and color of light to which the light sensor is exposed and dynamically adjust the output of the light source to match the determined intensity and color of light to which the light sensor is exposed.
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Citations
20 Claims
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1. A method of operating a back lighting system of a keyboard comprising:
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actuating a light sensor to sense ambient light through at least one key on said keyboard; determining a white point of the sensed ambient light; determining a constant contrast ratio of the sensed ambient light and a non-illuminated surface; actuating a multicolor light source to dynamically provide a desired white point output through a light distribution network associated with said at least one key, said desired white point output approximately equal to the determined white point of the sensed ambient light; and adjusting a brightness output of the light source based on the constant contrast ratio, said constant contrast ratio including a ratio of the sensed ambient light to a brightness of said light source. - View Dependent Claims (2, 3, 4, 5)
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6. A backlit keyboard comprising:
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one or more light sources comprising independently operable red LEDs, green LEDs and blue LEDs; one or more light distribution networks to distribute light to one or more keys of the keyboard, the keys comprising; a transparent portion through which light emitted from the one or more light sources may pass; and an opaque surface adjacent the transparent portion; one or more light sensors configured to sense ambient light through said transparent portion; and a controller configured to determine intensity and color of the sensed ambient light and actuate the red, green and blue LEDs to create an output light having a color and intensity approximately equal to the ambient light reflected from the opaque surface and wherein intensity includes a constant contrast ratio, said constant contrast ratio including a ratio of the sensed ambient light to a brightness output of said light sources. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification