Display Devices With Ambient Light Sensing
First Claim
1. A method of controlling an illumination source for a display device, the display device comprising a display modulator for modulating the light provided by the illumination source, the method comprising:
- using an integrated light sensor to detect a light level with first illumination source and light sensor drive conditions;
using the integrated light sensor to detect a light level with second illumination source and light sensor drive conditions different to the first drive conditions;
processing the first and second detected light levels to derive a first value representing the ambient light level and a second value representing the illumination source output level; and
controlling the display device using the first and second values.
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Accused Products
Abstract
A method of controlling an illumination source for a display device comprises using an integrated light sensor (14) to detect a light level when the illumination source (12) and light sensor are driven with first drive conditions and using the integrated light sensor to detect a light level when the illumination source (12) and light sensor are driven with second drive conditions, different to the first drive conditions. The first and second detected light levels are processed to derive a first value representing the ambient light level and a second value representing the illumination source output level. This method uses at least two light sensor measurements to derive information concerning both the ambient light levels and the illumination source output level for known drive conditions. This then enables the display device to be controlled taking into account the ambient light level and taking into account the output characteristics of the illumination source.
68 Citations
14 Claims
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1. A method of controlling an illumination source for a display device, the display device comprising a display modulator for modulating the light provided by the illumination source, the method comprising:
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using an integrated light sensor to detect a light level with first illumination source and light sensor drive conditions; using the integrated light sensor to detect a light level with second illumination source and light sensor drive conditions different to the first drive conditions; processing the first and second detected light levels to derive a first value representing the ambient light level and a second value representing the illumination source output level; and controlling the display device using the first and second values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A computer program, embodied on a computer readable medium, for controlling an illumination source for a display device, the computer program causing the acts to be carried out comprising:
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using an integrated light sensor to detect a light level with first illumination source and light sensor drive conditions; using the integrated light sensor to detect a light level with second illumination source and light sensor drive conditions different to the first drive conditions; processing the first and second detected light levels to derive a first value representing the ambient light level and a second value representing the illumination source output level; and controlling the display device using the first and second values.
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13. (canceled)
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14. A display device comprising:
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an illumination source; a display modulator for modulating the light provided by the illumination source; an integrated light sensor to detect a light level comprising the combination of a portion of the light from the illumination source and an ambient light component; and a processor for processing the signals received from the light sensor, wherein the processor processes a first light sensor output representing a light level with first illumination source and light sensor drive conditions and a second light sensor output representing a light level with second illumination source and light sensor drive conditions, different to the first drive conditions, to derive a first value representing the ambient light level and a second value representing the illumination source output level.
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Specification