Patent ID: 8319721

Claim:
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.