Input/output device and driving method thereof
First Claim
1. A method for driving an input/output device comprising:
- a display circuit; and
a photodetector circuit,the method for driving comprising the steps of;
supplying a display signal to the display circuit during a first display mode;
not supplying the display signal to the display circuit during a second display mode;
supplying a display data signal to the display circuit during the first display mode;
supplying N (N is a natural number of 2 or more) reset signals to the photodetector circuit during a first photodetection mode;
supplying M (M is a natural number smaller than N) reset signals to the photodetector circuit during a second photodetection mode;
supplying N select signals to the photodetector circuit during the first photodetection mode;
supplying M select signals to the photodetector circuit during the second photodetection mode;
performing a reset operation in accordance with the reset signals by the photodetector circuit;
performing a photocurrent detecting operation to generate data according to an intensity of light entering the photodetector circuit after the reset operation by the photodetector circuit; and
performing a selecting operation to output the data as a data signal in accordance with the select signals by the photodetector circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
An object is to reduce power consumption. An input/output device including: a display selection signal output circuit outputting a display selection signal during a first display mode and stopping outputting the display selection signal during a second display mode; a photodetection reset signal output circuit outputting N (N is a natural number) photodetection reset signals during a first photodetection mode and outputting M (M is a natural number smaller than N) photodetection reset signals during a second photodetection mode; an output selection signal output circuit outputting N output selection signals during the first photodetection mode and outputting M output selection signals during the second photodetection mode; and a photodetector circuit being reset in accordance with a photodetection reset signal, generating data according to an intensity of light entering the photodetector circuit subsequently, and outputting the data as a data signal in accordance with the output selection signal.
-
Citations
20 Claims
-
1. A method for driving an input/output device comprising:
-
a display circuit; and a photodetector circuit, the method for driving comprising the steps of; supplying a display signal to the display circuit during a first display mode; not supplying the display signal to the display circuit during a second display mode; supplying a display data signal to the display circuit during the first display mode; supplying N (N is a natural number of 2 or more) reset signals to the photodetector circuit during a first photodetection mode; supplying M (M is a natural number smaller than N) reset signals to the photodetector circuit during a second photodetection mode; supplying N select signals to the photodetector circuit during the first photodetection mode; supplying M select signals to the photodetector circuit during the second photodetection mode; performing a reset operation in accordance with the reset signals by the photodetector circuit; performing a photocurrent detecting operation to generate data according to an intensity of light entering the photodetector circuit after the reset operation by the photodetector circuit; and performing a selecting operation to output the data as a data signal in accordance with the select signals by the photodetector circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for driving an input/output device comprising:
-
a display circuit; a photodetector circuit; a display driver circuit; and a photodetector driver circuit, the method for driving comprising the steps of; supplying a display signal from the display driver circuit to the display circuit during a first display mode; not supplying the display signal from the display driver circuit to the display circuit during a second display mode; supplying a display data signal to the display circuit during the first display mode; supplying N (N is a natural number of 2 or more) reset signals from the photodetector driver circuit to the photodetector circuit during a first photodetection mode; supplying M (M is a natural number smaller than N) reset signals from the photodetector driver circuit to the photodetector circuit during a second photodetection mode; supplying N select signals from the photodetector driver circuit to the photodetector circuit during the first photodetection mode; supplying M select signals from the photodetector driver circuit to the photodetector circuit during the second photodetection mode; performing a reset operation in accordance with the reset signals by the photodetector circuit; performing a photocurrent detecting operation to generate data according to an intensity of light entering the photodetector circuit after the reset operation by the photodetector circuit; and performing a selecting operation to output the data as a data signal in accordance with the select signals by the photodetector circuit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. An input/output device comprising:
-
a display selection signal output circuit configured to perform supply of a display selection signal during a first display mode and configured to stop supply of the display selection signal during a second display mode; a display data signal output circuit configured to receive an image signal and configured to generate a display data signal on a basis of the image signal; a photodetection reset signal output circuit configured to generate N (N is a natural number of 2 or more) photodetection reset signals during a first photodetection mode and configured to generate M (M is a natural number smaller than N) photodetection reset signals during a second photodetection mode; an output selection signal output circuit configured to generate N output selection signals during the first photodetection mode and configured to generate M output selection signals during the second photodetection mode; and a photodetector circuit configured to receive the photodetection reset signal and the output selection signal, configured to perform reset in accordance with the photodetection reset signal, configured to generate data according to an intensity of light entering the photodetector circuit subsequently, and configured to generate the data as a data signal in accordance with the output selection signal. - View Dependent Claims (19)
-
-
20. A method for driving an input/output device comprising:
-
a display selection signal output circuit; a pixel data signal output circuit; a photodetection selection signal output circuit; a photodetector circuit; and a reading circuit, the method for driving comprising the steps of; performing supply of a photodetection reset signal to the photodetector circuit; performing reset of the photodetector circuit in accordance with the photodetection reset signal every unit period; generating data in the photodetector circuit according to an intensity of light entering the photodetector circuit subsequently after the reset of the photodetector circuit; generating N (N is a natural number of 2 or more) photodetection selection signals from the photodetection selection signal output circuit during a first photodetection mode; outputting the data as a first data signal from the photodetector circuit in accordance with one of the N photodetection selection signals; reading the first data signal from the photodetector circuit sequentially by the reading circuit; generating M (M is a natural number smaller than N) photodetection selection signals from the photodetection selection signal output circuit during a second photodetection mode; outputting the data as a second data signal from the photodetector circuit in accordance with one of the M photodetection selection signals; reading the second data signal from the photodetector circuit sequentially by the reading circuit; generating a display selection signal from the display selection signal output circuit during a first display mode and the first photodetection mode; generating the display selection signal from the display selection signal output circuit during the first display mode and the second photodetection mode; stopping generation of the display selection signal from the display selection signal output circuit during a second display mode and the first photodetection mode; stopping generation of the display selection signal from the display selection signal output circuit during the second display mode and the second photodetection mode; switching the input/output device from the second photodetection mode to the first photodetection mode in accordance with a value of data generated by the photodetector circuit in successive periods of the second photodetection mode; and switching the input/output device from the second display mode to the first display mode in accordance with the value of the data generated by the photodetector circuit in successive periods of the first photodetection mode.
-
Specification