Display devices with ambient light sensing
First Claim
1. A method of controlling a display device, the display device comprising an illumination source and a display modulator modulating light provided by the illumination source, the method comprising:
- using a light sensor arrangement in the display device to generate a first signal based on an ambient light level with a first illumination source drive condition, wherein the step of generating the first signal comprises;
detecting a light level with a first light sensor exposed to ambient light at an output of the display to generate a third signal;
detecting a light level with a second light sensor more shielded from the same ambient light than the first light sensor to generate a fourth signal; and
processing the third and fourth signals generated by the first and second sensors to derive the first signal;
using the light sensor arrangement in the display device to generate a second signal based on the same ambient light level but with a second illumination source drive condition, wherein the second illumination source drive condition is different to the first illumination source drive condition, and wherein the second illumination source drive condition and the first illumination source drive condition are implemented at different times, wherein the step of generating the second signal comprises;
detecting a light level with the first light sensor exposed to the same ambient light at the display output to generate a fifth signal;
detecting a light level with the second light sensor more shielded from the same ambient light than the first light sensor to generate a sixth signal; and
processing the fifth and sixth signals generated by the first and second sensors to derive the second signal;
processing the first and second signals to generate a first correction parameter and correcting the first signal using the first correction parameter to generate a corrected signal; and
controlling the display device based on the corrected signal.
3 Assignments
0 Petitions
Accused Products
Abstract
A method is provided of controlling an illumination source for a display device which comprises a display modulator for modulating the light provided by the illumination source. The method comprises using a light sensor arrangement to generate a first signal based on an ambient light level with first illumination source drive condition, and using the light sensor arrangement to generate a second signal based on the same ambient light level but with second illumination source drive condition different to the first drive condition. The first and second signals are processed to compensate for differences in the light sensor arrangement response characteristics when operating with the first and second illumination source drive conditions thereby to derive a compensated light sensor arrangement characteristic covering both the first and second illumination source drive conditions. Ambient light levels detected using this model of the characteristic are used to control the display device.
29 Citations
17 Claims
-
1. A method of controlling a display device, the display device comprising an illumination source and a display modulator modulating light provided by the illumination source, the method comprising:
-
using a light sensor arrangement in the display device to generate a first signal based on an ambient light level with a first illumination source drive condition, wherein the step of generating the first signal comprises; detecting a light level with a first light sensor exposed to ambient light at an output of the display to generate a third signal; detecting a light level with a second light sensor more shielded from the same ambient light than the first light sensor to generate a fourth signal; and processing the third and fourth signals generated by the first and second sensors to derive the first signal; using the light sensor arrangement in the display device to generate a second signal based on the same ambient light level but with a second illumination source drive condition, wherein the second illumination source drive condition is different to the first illumination source drive condition, and wherein the second illumination source drive condition and the first illumination source drive condition are implemented at different times, wherein the step of generating the second signal comprises; detecting a light level with the first light sensor exposed to the same ambient light at the display output to generate a fifth signal; detecting a light level with the second light sensor more shielded from the same ambient light than the first light sensor to generate a sixth signal; and processing the fifth and sixth signals generated by the first and second sensors to derive the second signal; processing the first and second signals to generate a first correction parameter and correcting the first signal using the first correction parameter to generate a corrected signal; and controlling the display device based on the corrected signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
-
-
11. A display device comprising:
-
an illumination source; a display modulator for modulating light provided by the illumination source; a light sensor arrangement generating signals based on an ambient light level and the illumination source; and a processor processing the signals received from the light sensor arrangement, wherein the processor is adapted to; use the light sensor arrangement to generate a first signal based on an ambient light level with first illumination source drive condition; use the light sensor arrangement to generate a second signal based on the same ambient light level but with second illumination source drive condition different to the first drive condition, wherein the second illumination source drive condition and the first second illumination source drive condition are implemented at different times; process the first and second signals to generate a first correction parameter and correcting the first signal using the first correction parameter to generate a corrected signal; and control the illumination source based on the corrected signal, wherein the processor is further adapted to; use the light sensor arrangement to generate a third signal based on a second ambient light level with the first illumination source drive condition; use the light sensor arrangement to generate a fourth signal based on the same second ambient light level but with the second illumination source drive condition; and process the first to fourth signals to compensate for differences in light sensor arrangement response characteristics when operating with the first and second illumination source drive conditions thereby to derive a compensated light sensor arrangement characteristic covering both the first and second illumination source drive conditions. - View Dependent Claims (15, 16, 17)
-
Specification