Backlight control of electronic device
First Claim
1. An electronic device, comprising:
- an outer housing;
a display processor disposed within said outer housing;
a visual display coupled to said display processor and adapted to provide a visual display output from the display processor to a user of the electronic device; and
a backlight control system includinga backlight adapted to illuminate the visual display,a switch configured to set the backlight to an ON or OFF state according to a backlight-off frequency, wherein the backlight-off frequency is determined such that flicker in the visual display is avoided, andan ambient light sensor adapted to sense an ambient light intensity when the backlight is temporarily off during the backlight-ON state, and to provide an indication thereof to a backlight control processor when the ambient light intensity is greater than a threshold value.
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Abstract
Embodiments are provided herein which may be utilized to eliminate stray light emissions from an LED while ambient light is being sensed. As such, dynamic backlight control systems for use with an electronic display are presented including: an ambient light sensor for sensing ambient light intensity; a backlight for illuminating the electronic display; a switch for controlling the backlight, the switch configured to set a backlight condition to ON or OFF in response to a backlight-off frequency such that the ambient light sensor senses the ambient light intensity in the absence of the backlight; a logic module for determining a backlight level in response to the ambient light intensity; and a backlight control circuit for adjusting the backlight to the backlight level in response to the ambient light intensity.
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Citations
19 Claims
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1. An electronic device, comprising:
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an outer housing; a display processor disposed within said outer housing; a visual display coupled to said display processor and adapted to provide a visual display output from the display processor to a user of the electronic device; and a backlight control system including a backlight adapted to illuminate the visual display, a switch configured to set the backlight to an ON or OFF state according to a backlight-off frequency, wherein the backlight-off frequency is determined such that flicker in the visual display is avoided, and an ambient light sensor adapted to sense an ambient light intensity when the backlight is temporarily off during the backlight-ON state, and to provide an indication thereof to a backlight control processor when the ambient light intensity is greater than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power control system in a battery powered portable device having an electronic display, comprising:
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a processor associated with an electronic display; a backlight that illuminates the electronic display coupled to the processor, wherein the backlight is adapted to switch on and off automatically according to a backlight-off frequency while the backlight is in a backlight-ON state; and an ambient light sensor adapted to detect an ambient light intensity while the backlight is temporarily off during the backlight-ON state and provide an indication thereof to the processor when the ambient light intensity is greater than a first threshold value, wherein the processor is adapted to respond to the indication by reducing power consumption of the portable device by adjusting the level of the backlight. - View Dependent Claims (10, 11, 12, 13)
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14. A method of conserving power in an electronic device, comprising:
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determining the periodicity of an electronic display on an electronic device; setting a backlight-off frequency of a backlight adapted to illuminate the electronic display, wherein the backlight-off frequency is set according to the periodicity such that flicker in the electronic display is avoided; sensing an ambient light intensity associated with the electronic display when the backlight is off; providing an indication to a backlight control processor when the ambient light intensity is greater than a first threshold value; and reducing power consumption of the electronic device by lowering the level of the backlight when the backlight control processor receives said indication. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification