Input sensor containing display device and method for driving the same

An input sensor containing display device comprising:

• a group of pixel circuits arranged in a matrix;
• a group of sensor circuits arranged in a matrix;
• a display driving circuit which provides a display signal to each column of the group of pixel circuits and which provides a driving signal to each row of the group of pixel circuits;
• a read circuit which specifies a row and column of the group of sensor circuits to identify an optical sensor to read a sense signal from this optical sensor;
• a read signal processing section which processes the sense signal output by the read circuit in accordance with a command requesting execution of an application;
• a command register provided in the read signal processing section;
• an interface section provided in the read signal processing section to transfer, when the command requesting execution of the application is sent to the interface section, the command to the register;
• an amplifier which amplifies a signal from an optical sensor provided in each of the pixel circuits;
• the optical sensor connected to a corresponding input of the amplifier;
• means for setting an input voltage of the amplifier to an operating threshold of the amplifier;
• and
• means for shifting the input voltage of the amplifier by a predetermined value before the amplifier outputs a signal.

An input sensor containing display device comprising:

• a group of pixel circuits arranged in a matrix;
• a group of sensor circuits arranged in a matrix;
• a display driving circuit which provides a display signal to each column of the group of pixel circuits and which provides a driving signal to each row of the group of pixel circuits;
• a read circuit which specifies a row and column of the group of sensor circuits to identify an optical sensor to read a sense signal from this optical sensor;
• a read signal processing section which processes the sense signal output by the read circuit in accordance with a command requesting execution of an application;
• a command register provided in the read signal processing section;
• and
• an interface section provided in the read signal processing section to transfer, when the command requesting execution of the application is sent to the interface section, the command to the register,
• wherein the each of sensor circuits includes,
• a sensor section in which a capacitor and a photodiode form a parallel circuit,
• an amplifying transistor having a gate to which one electrode of the sensor section is connected,
• a difference canceling transistor connected in series between one electrode of the amplifying transistor and the one electrode of the sensor section,
• an I/O transistor having one electrode connected to the one electrode of the amplifying transistor,
• a first signal line connected to the other electrode of the I/O transistor,
• a second signal line connected to the other electrode of the amplifying transistor,
• a third signal line connected to the other electrode of the sensor section,
• a first gate line connected to a control gate of the difference canceling transistor,
• a second gate line connected to a control gate of the I/O transistor,
• means for, during a precharge period of the capacitor, providing a first predetermined potential to the first signal line while providing a zero voltage to the second and third signal lines, to turn on the difference canceling transistor via the second gate line while turning on the I/O transistor via the second gate line,
• means for, during a difference canceling period following the precharge period, turning on the difference canceling transistor via the first gate line while turning off the I/O transistor via the second gate line,
• means for, during an image pickup period, turning off the difference canceling transistor via the first gate line while turning off the I/O transistor via the second gate line, and
• means for, during a read period, providing the first signal line with the first predetermined potential while providing the second signal line with a zero voltage and the third signal line with a potential which is almost half a preset maximum variation range of the sensor section, to turn off the difference canceling transistor via the first gate line while turning on the I/O transistor via the second gate line.