Patent ID: 9236012
Filing Date: 2016-01-12
CPC Classification: G09G,H03F

Claim Text:
1. A sensing apparatus of a display panel, comprising: a sensor, an input terminal of the sensor being coupled to a pixel circuit of the display panel via a data line of the display panel, so as to sense a threshold voltage of a current source transistor in the pixel circuit during a sensing period; and a sampling amplifier, a first input terminal and a second input terminal of the sampling amplifier being coupled to a first output terminal and a second output terminal of the sensor, respectively, the sensor comprising: a first switch, a first terminal of the first switch being coupled to the pixel circuit via the data line; a second switch, a first terminal of the second switch being coupled to a common mode voltage; a third switch, a first terminal and a second terminal of the third switch being respectively coupled to a second terminal of the first switch and a second terminal of the second switch; a first capacitor, a first terminal and a second terminal of the first capacitor being respectively coupled to a first reference voltage and the second terminal of the first switch; a first gain amplifier, an input terminal of the first gain amplifier being coupled to the second terminal of the first switch, an output terminal of the first gain amplifier acting as the first output terminal of the sensor and being coupled to the first input terminal of the sampling amplifier; and a second gain amplifier, an input terminal of the second gain amplifier being coupled to the second terminal of the second switch, an output terminal of the second gain amplifier acting as the second output terminal of the sensor and being coupled to the second input terminal of the sampling amplifier.