Dual-slope brightness control for transflective displays
First Claim
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1. A backlight brightness control system for a visual display comprising:
- a light sensor configured to detect ambient light and to output a signal indicative of the ambient light level; and
an electronic circuit coupled to the output of the light sensor and configured to generate a brightness control signal that increases backlight intensity of the visual display with increasing ambient light levels for a first range of ambient light levels and decreases the backlight intensity of the visual display with increasing ambient light levels for a second range of ambient light levels, wherein the first range of ambient light levels is lower than the second range of ambient light levels.
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Abstract
A backlight intensity for a transflective display increases proportionately with increasing ambient light levels for a first range of ambient light levels and decreases proportionately with increasing ambient levels for a second range of ambient light levels to improve power efficiency. The second range of ambient light levels is higher than the first range of ambient light levels.
121 Citations
20 Claims
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1. A backlight brightness control system for a visual display comprising:
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a light sensor configured to detect ambient light and to output a signal indicative of the ambient light level; and
an electronic circuit coupled to the output of the light sensor and configured to generate a brightness control signal that increases backlight intensity of the visual display with increasing ambient light levels for a first range of ambient light levels and decreases the backlight intensity of the visual display with increasing ambient light levels for a second range of ambient light levels, wherein the first range of ambient light levels is lower than the second range of ambient light levels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method to control brightness in a visual display, the method comprising the steps of:
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sensing ambient light with a visible light detector, wherein the visible light detector outputs a current signal that varies linearly with the ambient light level;
increasing a backlight intensity of the visual display proportionately with increasing ambient light levels for a first range of ambient light levels; and
decreasing the backlight intensity of the visual display proportionately with increasing ambient light levels for a second range of ambient light levels, wherein the second range of ambient light levels is higher than the first range of light levels. - View Dependent Claims (14, 15, 16, 17)
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18. A brightness control system for a visual display comprising:
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means for sensing ambient light levels; and
means for generating a control signal that increases backlight intensity of the visual display proportionately with increasing ambient light for a first range of ambient light levels and decreases the backlight intensity of the transflective display proportionately with increasing ambient light for a second range of ambient light levels. - View Dependent Claims (19, 20)
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Specification