Position detection device, electronic apparatus, and display device

1. A display device comprising:

a screen on which an image is displayed; and

a position detection device including

a light emitting section adapted to emit an irradiation light beam along the screen,

a plurality of light receiving sections adapted to receive a reflected light beam caused by an object reflecting the irradiation light beam, the plurality of light receiving sections having a proximal end light receiver and a distal end light receiver, and

a detection section adapted to detect position information of the object based on a light reception result of the plurality of light receiving sections, wherein

the plurality of light receiving sections are linearly arranged along a first direction perpendicular to the screen, each of the plurality of light receiving sections is located apart from the screen with a different distance between the screen and each of the plurality of light receiving sections, the proximal end light receiver is located closer to the screen than the distal end light receiver,

a first detection range in the first direction from which the distal end light receiver receives the reflected light beam is larger than a second detection range in the first direction from which the proximal end light receiver receives the reflected light beam,

the first detection range is not overlapped with the second detection range in the first direction, and

the position detection device has detection accuracy of the position information of the object varying in accordance with a position of the object in the first direction.

2. The display device according to claim 1 , wherein

the position detection device varies a detection period of the position information of the object in accordance with the position in the first direction.

3. The display device according to claim 2 , wherein

the shorter the distance between the object and the screen is, the shorter the position detection device set the detection period of the position information.

4. The display device according to claim 1 , wherein

the position detection device varies an intensity of the irradiation light beam in accordance with the position in the first direction.

5. The display device according to claim 4 , wherein

the longer the distance between the object and the screen is, the weaker the position detection device set the intensity of the irradiation light beam.

6. The display device according to claim 1 , wherein

the light receiving section includes amplifier sections adapted to amplify light reception detection signals from each of the plurality of light receiving sections, and

the amplifier sections are different in gain from each other in accordance with the positions of the corresponding light receiving sections in the first direction.

7. The display device according to claim 1 , wherein

each of the plurality of light receiving sections has an incident light restriction section adapted to restrict an incident light beam along the first direction, and

a restriction degree of the incident light restriction section of the proximal end light receiver is stronger than a restriction degree of the incident light restriction section of the distal end light receiver.

8. The display device according to claim 7 , wherein

the incident light restriction section is a slit including first and second slits, and

a width of the first slit for the proximal end light receiver is narrower than a width of the second slit for the distal end light receiver.

9. A position detection device comprising:

a light emitting section adapted to emit an irradiation light beam along an X-Y plane of a screen on which an image is displayed;

a plurality of light receiving sections adapted to receive a reflected light beam caused by an object reflecting the irradiation light beam, the plurality of light receiving sections having a proximal end light receiver and a distal end light receiver; and

a detection section adapted to detect position information of the object based on a light reception result of the plurality of light receiving sections, wherein

the plurality of light receiving sections are linearly arranged along a Z-axis direction perpendicular to the X-Y plane, each of the plurality of light receiving sections is located apart from the screen with a different distance between the screen and each of the plurality of light receiving sections, the proximal end light receiver is located closer to the screen than the distal end light receiver,

a first detection range in the Z-axis direction from which the distal end light receiver receives the reflected light beam is larger than a second detection range in the Z-axis direction from which the proximal end light receiver receives the reflected light beam,

the first detection range is not overlapped with the second detection range in the Z-axis direction, and

detection accuracy of the position information of the object varies in accordance with a Z-coordinate position of the object in the Z-axis direction.

10. The position detection device according to claim 9 , wherein

a detection period of the position information of the object varies in accordance with the position in the Z-axis direction.

11. The position detection device according to claim 9 , wherein

an intensity of the irradiation light beam varies in accordance with the position in the Z-axis direction.

12. An electronic apparatus comprising the optical position detection device according to claim 9 .

13. An electronic apparatus comprising the optical position detection device according to claim 10 .

14. An electronic apparatus comprising the optical position detection device according to claim 11 .