Patent ID: 11862092
Assignee: WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A display device, comprising:
a pixel circuit comprising a plurality of pixel units arranged in an array, wherein each of the pixel units comprises a driving transistor, a storage capacitor, and a light-emitting device; and
a plurality of operational amplifiers, the pixel units in a same column are electrically connected to the same operational amplifier;
wherein each operational amplifier and the corresponding driving transistor form a negative feedback loop for controlling a voltage at an input terminal of the light-emitting device to be the same as a data voltage input externally;
each operational amplifier is configured to charge the corresponding storage capacitor, so that after the storage capacitor is charged, the light-emitting device is driven by the driving transistor to emit light; a charging time for the operational amplifier to charge the storage capacitor is less than a predetermined value;
wherein a gate of each driving transistor of the pixel units in the same column is electrically connected to a first common terminal and connected to an output terminal of the same operational amplifier; a drain of each driving transistor of the pixel units in the same column is electrically connected to a first power source;
a source of each driving transistor of the pixel units in each column is electrically connected to a second common terminal and connected to a non-inverting input terminal of the same operational amplifier;
a first terminal of the storage capacitor is electrically connected to the first common terminal, and a second terminal of the storage capacitor is electrically connected to a second power source;
an anode of the light-emitting device is configured as its input terminal and is electrically connected to the second common terminal, and a cathode of the light-emitting device is electrically connected to the second power source;
the non-inverting input terminal of each of the operational amplifiers is electrically connected to the second common terminal, and an inverting input terminal of each of the operational amplifiers is configured to receive the data voltage and is coupled to the output terminal of the operational amplifier, and the output terminal of the operational amplifier is coupled to the first common terminal; and
a first resistor and a second resistor, wherein the inverting input terminal of each of the operational amplifiers receives the data voltage via the first resistor and is electrically connected to the output terminal of the operational amplifier via the second resistor.