Pixel circuits including feedback capacitors and reset capacitors, and dispay systems therefore

A pixel circuit, connected to a data line and an emission control line, comprising:

• a drive transistor including a gate terminal and arranged to convey a drive current through a light emitting device, the drive current being conveyed according to a voltage on the gate terminal;
• a storage capacitor connected to the gate terminal for storing programming voltages conveyed via the data line;
• an emission control transistor connected in series between the drive transistor and the light emitting device connected to the emission control line and capable of preventing emission of the light emitting device while the storage capacitor is being charged;
• and
• a feedback capacitor connected between the light emitting device and a gate terminal of the drive transistor;
• wherein in response to voltage changes across the light emitting device, the feedback capacitor is capable of generating corresponding voltage changes at the gate terminal of the drive transistor based on a combined capacitance of the storage and feedback capacitors, resulting in changes in the drive current conveyed to the light emitting device.

A display system comprising a plurality of pixel circuits arranged in rows and columns, each of plurality of pixel circuits including:

• a drive transistor including a gate terminal and arranged to convey a drive current through a light emitting device, the drive current being conveyed according to a voltage on the gate terminal;
• a storage capacitor connected to the gate terminal for storing programming voltages conveyed via the data line;
• an emission control transistor connected in series between the drive transistor and the light emitting device connected to the emission control line and capable of preventing emission of the light emitting device while the storage capacitor is being charged;
• and
• a feedback capacitor connected between the light emitting device and a gate terminal of the drive transistor;
• wherein in response to voltage changes across the light emitting device, the feedback capacitor is capable of generating corresponding voltage changes at the gate terminal of the drive transistor based on a combined capacitance of the storage and feedback capacitors, resulting in changes in the drive current by modifying conductance of a channel region of the drive transistor.

A pixel circuit connectable to a data line comprising:

• a drive transistor including a gate terminal and arranged to convey a drive current through a light emitting device during emission cycles, the drive current being conveyed according to a voltage on the gate terminal;
• a storage capacitor connected to the gate terminal for storing programming voltages conveyed via the data line during programming and/or compensation cycles;
• a first switch transistor connected between the gate terminal of the drive transistor and a node of the pixel circuit between the drive transistor and the light emitting device;
• and
• a reset capacitor connected between the node and a reset line such that the reset line is capacitively coupled to the gate terminal of the drive transistor while the first switch transistor is turned on capable of generating a change in voltage at the gate terminal based on the storage and reset capacitors for resetting the drive transistor between emission cycles.