Input-output device and method for driving the same
First Claim
1. An input-output device comprising:
- a first light unit including Z light-emitting diodes, wherein Z is a natural number of 3 or more;
a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident;
X display circuits provided between the first light unit and the second light unit, configured to be supplied with a display selection signal and a display data signal in accordance with the display selection signal, and configured to be set in a display state corresponding to data of the display data signal, wherein X is a natural number; and
Y light detection circuits each provided between the first light unit and the second light unit, configured to be supplied with a light-detection control signal, and configured to generate data corresponding to illuminance of incident light in accordance with the light-detection control signal, wherein Y is a natural number of 2 or more,wherein the Y light detection circuits form a matrix of at least 2 columns and two lines and are supplied with a same light-detection control signal such that the Y light detection circuits are driven by a global shutter method, andwherein each of the Y light detection circuits includes;
a photoelectric conversion element including a first current terminal and a second current terminal, wherein a current flows between the first current terminal and the second current terminal in accordance with the illuminance of the incident light;
a light-detection control transistor that is a field-effect transistor including a source and a drain, one of which is electrically connected to the second current terminal of the photoelectric conversion element, and a gate configured to be supplied with the light-detection control signal, and including an oxide semiconductor layer in which a channel is formed and a carrier concentration is lower than 1×
1014/cm3; and
an amplification transistor that is a field-effect transistor including a gate electrically connected to the other of the source and the drain of the light-detection control transistor, and a source and a drain from one of which data corresponding to the illuminance of the incident light is configured to output as a data signal.
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Accused Products
Abstract
To increase the light detection accuracy, a method for driving an input-output device that includes a first light unit, a second light unit, a display circuit, and Y light detection circuits (Y is a natural number of 2 or more) is proposed. The same light-detection control signal is input to the Y light detection circuits. In a frame period set by a display selection signal, the first light unit is lit by sequentially switching Z light-emitting diodes and emitting light, and the second light unit is lit by making the white light-emitting diode emit light when the first light unit is not lit. In a period when the second light unit is lit, Y pieces of data corresponding to the illuminance of light entering the Y light detection circuits are generated.
38 Citations
22 Claims
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1. An input-output device comprising:
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a first light unit including Z light-emitting diodes, wherein Z is a natural number of 3 or more; a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident; X display circuits provided between the first light unit and the second light unit, configured to be supplied with a display selection signal and a display data signal in accordance with the display selection signal, and configured to be set in a display state corresponding to data of the display data signal, wherein X is a natural number; and Y light detection circuits each provided between the first light unit and the second light unit, configured to be supplied with a light-detection control signal, and configured to generate data corresponding to illuminance of incident light in accordance with the light-detection control signal, wherein Y is a natural number of 2 or more, wherein the Y light detection circuits form a matrix of at least 2 columns and two lines and are supplied with a same light-detection control signal such that the Y light detection circuits are driven by a global shutter method, and wherein each of the Y light detection circuits includes; a photoelectric conversion element including a first current terminal and a second current terminal, wherein a current flows between the first current terminal and the second current terminal in accordance with the illuminance of the incident light; a light-detection control transistor that is a field-effect transistor including a source and a drain, one of which is electrically connected to the second current terminal of the photoelectric conversion element, and a gate configured to be supplied with the light-detection control signal, and including an oxide semiconductor layer in which a channel is formed and a carrier concentration is lower than 1×
1014/cm3; andan amplification transistor that is a field-effect transistor including a gate electrically connected to the other of the source and the drain of the light-detection control transistor, and a source and a drain from one of which data corresponding to the illuminance of the incident light is configured to output as a data signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An input-output device comprising:
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a first light unit including Z light-emitting diodes, wherein Z is a natural number of 3 or more; a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident; X display circuits provided between the first light unit and the second light unit, wherein X is a natural number; and Y light detection circuits each provided between the first light unit and the second light unit, wherein Y is a natural number of 2 or more, wherein the Y light detection circuits form a matrix of at least 2 columns and two lines and are supplied with a same light-detection control signal such that the Y light detection circuits are driven by a global shutter method, and wherein each of the Y light detection circuits includes; a photoelectric conversion element; a light-detection control transistor that is a field-effect transistor including an oxide semiconductor layer in which a channel is formed and a carrier concentration is lower than 1×
1014/cm3; andan amplification transistor. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for driving an input-output device comprising a first light unit including Z light-emitting diodes, wherein Z is a natural number of 3 or more;
- a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident;
X display circuits provided between the first light unit and the second light unit, configured to be supplied with a display selection signal and a display data signal in accordance with the display selection signal, and configured to be set in a display state corresponding to data of the display data signal, wherein X is a natural number; and
Y light detection circuits each provided between the first light unit and the second light unit, configured to be supplied with a light-detection control signal, and configured to generate data corresponding to illuminance of incident light in accordance with the light-detection control signal, wherein Y is a natural number of 2 or more, the method comprising steps of;inputting a same light-detection control signal to each of the Y light detection circuits such that the Y light detection circuits are driven by a global shutter method; in a frame period set by the display selection signal, making the first light unit lit by sequentially switching the Z light-emitting diodes and emitting light, and making the second light unit lit by making the white light-emitting diode emit light when the first light unit is not lit; and generating Y pieces of data corresponding to the illuminance of the incident light in a period when the second light unit is lit, wherein each of the Y light detection circuits includes; a photoelectric conversion element; a light-detection control transistor that is a field-effect transistor including an oxide semiconductor layer in which a channel is formed and a carrier concentration is lower than 1×
1014/cm3; andan amplification transistor. - View Dependent Claims (14, 15, 16, 17)
- a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident;
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18. A method for driving an input-output device comprising a first light unit including Z light-emitting diodes, wherein Z is a natural number of 3 or more;
- a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident;
X display circuits provided between the first light unit and the second light unit, configured to be supplied with a display selection signal and a display data signal in accordance with the display selection signal, and configured to be set in a display state corresponding to data of the display data signal, wherein X is a natural number; and
Y light detection circuits each provided between the first light unit and the second light unit, configured to be supplied with a light-detection control signal, and configured to generate data corresponding to illuminance of incident light in accordance with the light-detection control signal, wherein Y is a natural number of 2 or more, the method comprising steps of;inputting a same light-detection control signal to each of the Y light detection circuits such that the Y light detection circuits are driven by a global shutter method; in a frame period set by the display selection signal, making the first light unit lit by sequentially switching the Z light-emitting diodes and emitting light, and making the second light unit lit by making the white light-emitting diode emit light when the first light unit is not lit; generating Y pieces of first data corresponding to first illuminance of the incident light in a first period when the second light unit is lit; generating Y pieces of second data corresponding to second illuminance of the incident light in a second period when the first light unit and the second light unit are not lit; and generating third data that is data of difference between the first data and the second data, wherein each of the Y light detection circuits includes; a photoelectric conversion element; a light-detection control transistor that is a field-effect transistor including an oxide semiconductor layer in which a channel is formed and a carrier concentration is lower than 1×
1014/cm3; andan amplification transistor. - View Dependent Claims (19, 20, 21, 22)
- a second light unit including a white light-emitting diode and a light guide plate on which light from the white light-emitting diode is incident;
Specification