Display device

1. A display device comprising: a display part on which a plurality of pixels are arranged in a matrix array; and a plurality of photo detection circuits which are arranged in a matrix array in the inside of the display part, wherein each photo detection circuit of the plurality of photo detection circuits includes: a photo sensor which converts an incident light into an optical current corresponding to intensity of the incident light;

an integral capacitance which integrates the optical current converted by the photo sensor; and

a comparator to which a voltage of the integral capacitance is inputted; and

the comparator includes a transistor of an open drain output type with a grounded source, wherein an initializing voltage which initializes the integral capacitance is applied to the integral capacitance via a reset line,

an output of the comparator includes X output lines, an X output circuit which is connected to Y output lines which intersect the X output lines and to which the respective X output lines are connected, and a Y output circuit to which the respective Y output lines are connected, and the X output circuit and the Y output circuit are arranged around the display part.

2. A display device comprising:

a display part on which a plurality of pixels are arranged in a matrix array; and

a plurality of photo detection circuits which are arranged in a matrix array in the inside of the display part, wherein

the display part includes a plurality of X output lines and a plurality of Y output lines which intersect the plurality of X output lines,

each photo detection circuit of the plurality of photo detection circuits includes:

a photo sensor which converts an incident light into an optical current corresponding to intensity of the incident light;

an integral capacitance which is connected to one end of the photo sensor and integrates the optical current which is converted by the photo sensor;

a first transistor which has a control electrode thereof connected to a node between the photo sensor and the integrated capacitance, a first electrode thereof connected to one of the plurality of X output lines, and allows a predetermined first voltage to be applied to a second electrode thereof; and

a second transistor which has a control electrode thereof connected to a node between the photo sensor and the integrated capacitance, a first electrode thereof connected to one of the plurality of Y output lines, and allows a predetermined second voltage to be applied to a second electrode thereof.

3. A display device according to claim 2 , wherein the display device further includes:

an X output circuit to which the respective X output lines of the plurality of X output lines are connected; and

the Y output circuit to which the respective Y output line of the plurality of Y output lines are connected, wherein

the X output circuit and the Y output circuit respectively have an initializing circuit which applies an initializing voltage for initializing the respective X output lines and the respective Y output lines to the respective X output lines and the respective Y output lines at an initial stage of a detection period for detecting the photo detection circuit to which light is radiated out of the plurality of photo detection circuits.

4. A display device comprising: a display part on which a plurality of pixels are arranged in a matrix array; and

a plurality of photo detection circuits which are arranged in a matrix array in the inside of the display part, wherein the display part includes:

a plurality of X output lines and a plurality of Y output lines which intersect the plurality of X output lines, and

each photo detection circuit of the plurality of photo detection circuits includes:

a photo sensor which converts an incident light into an optical current corresponding to intensity of the incident light;

an integral capacitance which is connected to one end of the photo sensor and integrates the optical current which is converted by the photo sensor, and

a transistor which has a control electrode thereof connected to a node between the photo sensor and the integrated capacitance and, at the same time, a first electrode thereof connected to one of the plurality of X output lines, and a second electrode thereof connected to one of the plurality of Y output lines,

wherein the display device further includes:

an X output circuit to which the respective X output lines of the plurality of X output lines are connected; and

the Y output circuit to which the respective Y output lines of the plurality of Y output lines are connected, and

the Y output circuit includes;

a first voltage applying circuit which applies a predetermined first voltage to the respective Y output lines during a first detection period for detecting a position in the X direction of the photo detection circuit to which light is radiated out of the plurality of photo detection circuits,

the X output circuit includes a first initializing circuit which applies a first initializing voltage for initializing the respective X output lines to the respective X output lines at an initial stage of the first detection period,

the X output circuit includes a second voltage applying circuit which applies a predetermined second voltage to the respective X output lines during a second detection period for detecting a position in the Y direction of the photo detection circuit to which light is radiated out of the plurality of photo detection circuits, and the Y output circuit includes a second initializing circuit which applies a second initializing voltage for initializing the respective Y output lines to the respective Y output lines at an initial stage of the second detection period.

5. A display device according to any one of claims 2 to 4 , wherein the display device includes a reset line which is connected to another end of the photo sensor, and an integrated capacitance initializing voltage which initializes the integrated capacitance is applied to the reset line in an initial stage of a detection period for detecting a photo detection circuit to which light is radiated out of the plurality of photo detection circuits.

6. A display device according to claim 3 , wherein the X output circuit and the Y output circuit detect the optical currents in multiple gray scales by performing the detection of voltages of the X output lines and the Y output lines plural times during one detection period for detecting the photo detection circuit to which light is radiated out of the plurality of photo detection circuits.

7. A display device comprising:

a display part on which a plurality of pixels are arranged in a matrix array;

a plurality of scanning lines which sequentially apply a scanning voltage to the plurality of pixels; and

a plurality of photo detection circuits which are arranged in a matrix array in the inside of the display part, wherein

the display part includes a plurality of X output lines,

each photo detection circuit out of the plurality of photo detection circuits includes:

a photo sensor which has one end thereof connected to the scanning lines of a next stage out of the plurality of scanning lines and converts an incident light into an optical current corresponding to intensity of the incident light;

an integrated capacitance which has one end thereof connected to another end of the photo sensor and integrates the optical current which is converted by the photo sensor;

a first transistor which is connected between the own-stage scanning line out of the plurality of scanning lines and another end of the integrated capacitance, and has a control electrode thereof connected to a node between the photo sensor and the integrated capacitance, and

a second transistor which has a control electrode thereof connected to the own-stage scanning line and, at the same time, a first electrode thereof connected to another end of the integrated capacitance, and a second electrode thereof connected to one of the plurality of X output lines.

8. A display device comprising:

a display part on which a plurality of pixels are arranged in a matrix array;

a plurality of scanning lines which sequentially apply a scanning voltage to the plurality of pixels; and

a plurality of photo detection circuits which are arranged in a matrix array in the inside of the display part, wherein

the display part includes a plurality of X output lines and a plurality of initializing control lines,

each photo detection circuit out of the plurality of photo detection circuits includes:

a photo sensor which has one end thereof connected to one out of the plurality of initializing control lines and converts an incident light into an optical current corresponding to intensity of the incident light;

an integrated capacitance which has one end thereof connected to another end of the photo sensor and integrates the optical current which is converted by the photo sensor;

a first transistor which is connected between the own-stage scanning line out of the plurality of scanning lines and another end of the integrated capacitance, and has a control electrode thereof connected to a node between the photo sensor and the integrated capacitance; and

a second transistor which has a control electrode thereof connected to the own-stage scanning line, a first electrode thereof connected to another end of the integrated capacitance, and a second electrode thereof connected to one of the plurality of X output lines.

9. A display device according to claim 8 , wherein to the initializing control line and, at the same time, a photo detection circuit initializing voltage having a voltage change polarity opposite to a corresponding polarity of a scanning voltage which is applied to the next-stage scanning line out of the plurality of scanning lines is applied.

10. A display device according to any one of claims 7 to 9 , wherein the display device includes an X output circuit to which the respective output lines of the plurality of X output lines are connected,

the X output line includes an initializing circuit which applies an initializing voltage for initializing the X output lines to the respective X output lines when a non-selective scanning voltage is applied to the respective scanning lines of the plurality of scanning lines, and

the display device simultaneously performs writing of a display signal to the pixels corresponding to one row which are connected to the scanning lines to which the scanning voltage is applied out of the plurality of scanning lines and the detection of an output of the photo detection circuit corresponding to one row which includes the first transistor which is connected to the scanning line to which the scanning voltage is applied.

11. A display device according to any one of claims 1 , 2 to 4 , and 6 to 9 , wherein the photo sensor is constituted of a diode.

12. A display device according to claim 11 , wherein the photo sensor is constituted of a thin film transistor adopting the diode connection.

13. A display device according to claim 4 , wherein the X output circuit is arranged around the display part.

14. A display device according to any one of claims 1 , 2 to 4 , and 6 to 9 , wherein the photo detection circuit is provided for each pixel out of the plurality of pixels.

15. A display device according to claim 14 , wherein the display device is a liquid crystal display device, and

each pixel out of the plurality of pixels includes a first sub pixel having a first-color color filter, a second sub pixel having a second-color color filter which differs in color from the first-color, and a third sub pixel having a third-color color filter which differs in color from the first-color and second-color, and

the color filters are not arranged on a region where the photo detection circuit is formed.

16. A display device according to claim 1 , wherein the comparator includes first and second transistors of an open drain output type with a grounded source.

17. A display device according to claim 16 , wherein the first and second transistors have a control electrode thereof connected to a node between the photosensor and the integral capacitance.