Photo detection circuit, method of controlling the same, electro-optical panel, electro-optical device, and electronic apparatus

An electro-optical device comprising:

• a plurality of data lines;
• a plurality of scanning lines;
• a plurality of pixel circuits provided to correspond to intersections of the data lines and the scanning lines, and each having an electro-optical element having an optical characteristic changed by an electrical effect;
• a control circuit that generates a plurality of control signals;
• a driving circuit that generates a driving signal based on the plurality of control signals to output the driving signal to at least one of the plurality of data lines and the plurality of scanning lines;
• and
• a photo detection circuit which includes a photodiode whose cathode is connected to a high-potential-side power supply and whose anode is connected to a connection point, a capacitor element provided between the connection point and a low-potential-side power supply, and a switching element provided between the connection point and the low-potential-side power supply and switching on and off based on a first signal, the photo detection circuit extracting a voltage signal from the connection point,
• wherein the first signal serves as any one of the plurality of control signals.

An electro-optical device comprising:

• a plurality of data lines;
• a plurality of scanning lines;
• a plurality of pixel circuits provided to correspond to intersections of the plurality of data lines and the plurality of scanning lines, and each having an electro-optical element having an optical characteristic changed by an electrical effect;
• a control circuit that generates a plurality of control signals;
• a driving circuit that generates a driving signal based on the plurality of control signals to output the driving signal to at least one of the plurality of data lines and the plurality of scanning lines;
• and
• a photo detection circuit which includes a photodiode whose cathode is connected to a high-potential-side power supply and whose anode is connected to a connection point, a capacitor element provided between the connection point and a low-potential-side power supply, a switching element provided between the connection point and the low-potential-side power supply and switching on and off based on a first signal, and a logic circuit that executes logical multiplication between the first signal and a second signal having a period shorter than a period of the first signal to output a binarization signal,
• wherein the first and second signals serve as a portion of the plurality of control signals.

A method of controlling a photo detection circuit which includes a photodiode whose cathode is connected to a high-potential-side power supply and whose anode is connected to a connection point, and a capacitor element provided between the connection point and a low-potential-side power supply, the method comprising:

• short-circuiting both terminals of the capacitor element with a predetermined period;
• executing logical multiplication between a reference signal having a period shorter than the predetermined period, and a voltage signal of the connection point to generate a binarization signal;
• and
• outputting the binarization signal as a luminance signal indicating luminance.