Method and apparatus to control display brightness with ambient light correction
DC CAFCFirst Claim
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1. A brightness control circuit with selective ambient light correction comprising:
- a first input configured to receive a user signal indicative of a user selectable brightness setting;
a light sensor configured to sense ambient light and to output a sensing signal indicative of the ambient light level;
a multiplier configured to selectively generate a combined signal based on both the user signal and the sensing signal; and
a dark level bias configured to adjust the combined signal to generate a brightness control signal that is used to control a brightness level of a visible display such that the brightness control signal is maintained above a predetermined level when the ambient light level decreases to approximately zero.
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Abstract
An ambient light sensor produces a current signal that varies linearly with the level of ambient light. The current signal is multiplied by a user dimming preference to generate a brightness control signal that automatically compensates for ambient light variations in visual information display systems. The multiplying function provides noticeable user dimming control at relatively high ambient light levels.
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Citations
20 Claims
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1. A brightness control circuit with selective ambient light correction comprising:
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a first input configured to receive a user signal indicative of a user selectable brightness setting; a light sensor configured to sense ambient light and to output a sensing signal indicative of the ambient light level; a multiplier configured to selectively generate a combined signal based on both the user signal and the sensing signal; and a dark level bias configured to adjust the combined signal to generate a brightness control signal that is used to control a brightness level of a visible display such that the brightness control signal is maintained above a predetermined level when the ambient light level decreases to approximately zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method to selectively provide ambient light correction, said method comprising:
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receiving a user input signal indicative of a user selectable brightness setting; selectively multiplying the input signal with a sense signal to generate a combined signal, wherein the sense signal indicates an ambient light level; and adjusting the combined signal with a dark level bias to generate a brightness control signal for controlling brightness of a visible display such that the brightness control signal is maintained above a predetermined level when the ambient light level decreases to approximately zero. - View Dependent Claims (16, 17, 18)
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19. A brightness control circuit comprising:
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means for receiving an input signal indicative of a user selectable brightness setting; means for sensing ambient light to generate a sense signal indicative of the ambient light level; means for multiplying the input signal with the sense signal to generate a combined signal; and means for adjusting the combined signal with a dark level bias to generate a brightness control signal that is maintained above a minimum level when the ambient light level decreases to approximately zero. - View Dependent Claims (20)
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Specification