DISPLAY DEVICE
First Claim
1. A display device provided with an active matrix substrate, and comprising:
- a photosensor provided on the active matrix substrate;
sensor driving bus line connected to the photosensor;
a sensor driving circuit that supplies a sensor driving signal to the photosensor via the sensor driving bus line;
an amplifier circuit that amplifies sensor output that has been read out from the photosensor in accordance with the sensor driving signal, and outputs the amplified sensor output as a photosensor signal; and
a signal processing circuit that processes the photosensor signal that has been output from the amplifier circuit,wherein the photosensor includes a photodiode, a capacitor that is connected to the photodiode, and at least one switching element,the sensor driving bus line includes at least reset signal bus line that supplies a reset signal to the photosensor, and readout signal bus line that supplies a readout signal to the capacitor,due to the sensor driving circuit switching ON the readout signal after a predetermined time has elapsed since switching ON the reset signal, a photosensor signal that is in accordance with an amount of light received by the photosensor in the predetermined time is output to the signal processing circuit,and due to the sensor driving circuit changing the bias voltage of the capacitor, the capacitance of the capacitor is variable.
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Accused Products
Abstract
Dynamic range is widened in a display device with a photosensor that can read an image due to having a photodetection element inside a pixel thereof. A sensor driving circuit switches ON a reset signal (RST) that is supplied via reset signal bus line, and after a predetermined time has elapsed, switches ON a readout signal (RWS) that is supplied via readout signal bus line. Thus, in the photosensor, from which a photosensor signal is output in accordance with an amount of light received by the photosensor in the predetermined time, the capacitance of a capacitor provided in the photosensor is made variable from when the reset signal (RST) is supplied to the photosensor until when the predetermined time has elapsed.
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Citations
11 Claims
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1. A display device provided with an active matrix substrate, and comprising:
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a photosensor provided on the active matrix substrate; sensor driving bus line connected to the photosensor; a sensor driving circuit that supplies a sensor driving signal to the photosensor via the sensor driving bus line; an amplifier circuit that amplifies sensor output that has been read out from the photosensor in accordance with the sensor driving signal, and outputs the amplified sensor output as a photosensor signal; and a signal processing circuit that processes the photosensor signal that has been output from the amplifier circuit, wherein the photosensor includes a photodiode, a capacitor that is connected to the photodiode, and at least one switching element, the sensor driving bus line includes at least reset signal bus line that supplies a reset signal to the photosensor, and readout signal bus line that supplies a readout signal to the capacitor, due to the sensor driving circuit switching ON the readout signal after a predetermined time has elapsed since switching ON the reset signal, a photosensor signal that is in accordance with an amount of light received by the photosensor in the predetermined time is output to the signal processing circuit, and due to the sensor driving circuit changing the bias voltage of the capacitor, the capacitance of the capacitor is variable. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification