External compensation sensing circuit and sensing method thereof, display device

摘要

An external-compensation sensing circuit, sensing method, and display device. The circuit includes fully-differential operational amplifier, first capacitor, second capacitor and outputting circuit for amplifying induced current; negative input of the amplifier is connected to display screen, positive input thereof is connected to reference voltage, negative output thereof is connected to first control terminal of the outputting circuit, positive output thereof is connected to second control terminal of the outputting circuit; two terminals of the first capacitor are connected to the negative input of the amplifier and an input of the outputting circuit respectively; one terminal of the second capacitor is connected to the output of the outputting circuit and the other terminal is grounded. The invention enables the output voltage to respond rapidly by amplifying induced current with dual outputting stages in the sensing circuit to raise the speed of the external-compensation.

主权项

1. An external compensation sensing circuit including a fully differential operational amplifier, a first capacitor, a second capacitor and an outputting circuit for amplifying an induced current;
a negative input terminal of the fully differential operational amplifier is connected to a display screen, a positive input terminal of the fully differential operational amplifier is connected to a reference voltage, a negative output terminal of the fully differential operational amplifier is connected to a first control terminal of the outputting circuit, and a positive output terminal of the fully differential operational amplifier is connected to a second control terminal of the outputting circuit; two terminals of the first capacitor are connected to the negative input terminal of the fully differential operational amplifier and an input terminal of the outputting circuit, respectively; one terminal of the second capacitor is connected to an output terminal of the outputting circuit, and the other terminal of the second capacitor is grounded, wherein a first switch is disposed between the negative input terminal of the fully differential operational amplifier and the display screen, a second switch is disposed between the two terminals of the first capacitor, and a third switch is disposed between the second capacitor and the output terminal of the outputting circuit, and wherein the outputting circuit includes a first outputting circuit and a second outputting circuit, and the output current of the second outputting circuit is M times of the output current of the first outputting circuit, where M is greater than 1 and less than 100.