Electro-optical device, semiconductor device, display device, and electronic apparatus having the same

1. An electro-optical device comprising:

a panel having a display area in which an electro-optical material is interposed between first and second substrates;

a light detection unit disposed on the first or second substrate, the light detection unit including at least one light sensor to detect illuminance of ambient light of the pane; and

a light shielding electrode positioned relative to the sensor to block at least a portion of light emitted from a backlight unit from reaching the light sensor,

wherein the light detection unit performs a detecting operation plural times at a predetermined time interval, and

wherein the predetermined time interval is set to be a value except for an integer multiple of about 1/100 sec or about 1/120 sec.

2. A semiconductor device comprising:

a light sensor disposed on a substrate to measure illuminance of external light around the substrate;

a light shielding electrode positioned relative to the light sensor to block at least a portion of light emitted from a backlight unit from reaching the light sensor; and

a detection circuit connected to the light sensor to perform an output corresponding to the illuminance of the external light,

wherein the detection circuit performs an operation of detecting the illuminance of the external light plural times on the basis of an input from the light sensor, and

wherein T 1 is a time interval between a first detecting operation and a second detecting operation subsequent to the first detecting operation, and the time interval T 1 is set to be a value except for an integer multiple of about 1/100 sec or about 1/120 sec.

3. The semiconductor device according to claim 2 , wherein the time interval T 1 is set to be an (n+0.5) multiple of 1/100 sec, an (n+0.5) multiple of 1/120 sec, or a value therebetween, n being an integer greater than or equal to zero.

4. The semiconductor device according to claim 3 , further comprising a circuit (central operational circuit) that samples the output of the detection circuit plural times to perform a statistical process.

5. The semiconductor device according to claim 2 , wherein T 2 is a time interval between the second detecting operation and a third detecting operation subsequent to the second detecting operation, and the time interval T 1 and the time interval T 2 are different from each other.

6. The semiconductor device according to claim 3 ,

wherein T 2 is a time interval between the second detecting operation and a third detecting operation subsequent to the second detecting operation, and the time interval T 1 and the time interval T 2 are different from each other.

7. The semiconductor device according to claim 2 , wherein the light sensor is an element which converts the illuminance of the external light into current, and

wherein the detection circuit is a circuit which resets one end of a node connected to the light sensor to an initial potential every start of a detection period and which performs the detecting operation by detecting a variation in a potential of the node.

8. The semiconductor device according to claim 3 , wherein the light sensor is an element which converts the illuminance of the external light into current, and

wherein the detection circuit is a circuit which resets one end of a node connected to the light sensor to an initial potential every start of a detection period and which performs the detecting operation by detecting a variation in a potential of the node.

9. The semiconductor device according to claim 2 , wherein the light sensor is a PIN junction diode or a PN junction diode using a polysilicon thin film.

10. The semiconductor device according to claim 3 , wherein the light sensor is a PIN junction diode or a PN junction diode using a polysilicon thin film.

11. A display device comprising the semiconductor device according to claim 2 .

12. An electronic apparatus comprising the display device according to claim 11 .

13. The display device according to claim 12 , wherein the time interval T 1 is an integer multiple of a frame period at which display is rewritten.

14. A method of detecting ambient light comprising:

providing a panel having a display area in which an electro-optical material is interposed between first and second substrates; and

detecting illuminance of ambient light of the panel with a light detection unit disposed on the first or second substrate by performing a detecting operation a plurality of times during a predetermined time interval,

wherein the predetermined time interval is set to be a value except for an integer multiple of about 1/100 sec or about 1/120 sec.