Display devices with ambient light sensing

1. A display device comprising:

an illumination source;

a display modulator for modulating the light provided by the illumination source;

a light sensor arrangement to detect a light level; and

a processor for processing the signals received from the light sensor arrangement, wherein the light sensor arrangement comprises a plurality of light sensors at spaced locations, with each of the plurality of light sensors exposed to ambient light, and

wherein the processor is configured to process the light sensor signals such that localised shielding of the ambient light at the location of one or more of the light sensors is identified, and to derive an estimate of the ambient light level.

2. A display device as claimed in claim 1 , wherein the light sensors are integrated onto a display device substrate.

3. A display device as claimed in claim 1 , wherein the processor is configured to compare the light sensor signals, and to disregard the signal from one or more light sensors if the signal is significantly lower than the signal from all other sensors.

4. A display device as claimed in claim 3 , wherein the processor is configured to disregard the signal from one or more light sensors if the signal is more than a predetermined threshold lower than the signal from all other sensors.

5. A display device as claimed in claim 1 , wherein the processor is configured to compare the light sensor signals, and to combine the signals from all light sensors if they are all close to each other.

6. A display device as claimed in claim 5 , wherein the combining comprises an averaging.

7. A display device as claimed in claim 5 , wherein the signals from all light sensors are considered close to each other if they are within predetermined difference margins.

8. A display device as claimed in claim 1 , wherein the processor is implemented as a logic circuit which is integrated onto a display device substrate.

9. 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 a light sensor arrangement to detect a light level, the arrangement comprising a plurality of light sensors at spaced locations, with each of the plurality of light sensors exposed to ambient light;

processing the detected light levels such that localised shielding of light is identified at the location of one or more of the light sensors, and to derive an estimate of the ambient light level; and

controlling the display device using the ambient light level.

10. A method as claimed in claim 9 , wherein controlling the display device comprises controlling the illumination source.

11. A method as claimed in claim 9 , wherein the processing comprises comparing the light sensor signals, and disregarding the signal from one or more light sensors if the signal is significantly lower than the signal from all other sensors.

12. A method as claimed in claim 11 , wherein the processing comprises disregarding the signal from one or more light sensors if the signal is more than a predetermined threshold lower than the signal from all other sensors.

13. A method as claimed in claim 9 , wherein the processing comprises comparing the light sensor signals, and combining the signals from all light sensors if they are all close to each other.

14. A method as claimed in claim 13 , wherein the combining comprises an averaging.

15. A method as claimed in claim 13 , wherein the signals from all light sensors are considered close to each other if they are within predetermined difference margins.