Sensing circuit of display driver

A sensing circuit of display driver, comprising:

• a sample and hold circuit, for transforming an analog voltage signal corresponding to a pixel circuit to a pair of differential input signals, comprising:
• a first charging path, configured to selectively generate a first charging potential between a first sensing terminal and a first reference terminal according to the analog voltage signal and a reference voltage, wherein one of the pair of differential input signals is generated at the first sensing terminal;
• and
• a second charging path, configured to selectively conduct the reference voltage to a second sensing terminal, wherein the other one of the pair of differential input signals is generated at the second sensing terminal,
• wherein the first charging path and the second charging path are implemented by high voltage components;
• a gain amplifier, electrically connected to the sample and hold circuit, comprising:
• a first input terminal;
• a second input terminal;
• a first output terminal;
• and
• a second output terminal;
• and
• an input stage circuit, electrically connected to the first input terminal and the second input terminal, comprising:
• a current source;
• a first differential input transistor;
• and
• a second differential input transistor, wherein the first differential input transistor and the second differential input transistor are implemented by the high voltage components, wherein the gain amplifier is configured to receive the pair of differential input signals through the first and the second input terminals and generate a pair of differential output signals at the first and the second output terminals
• a first conduction path, electrically connected to the first input terminal and the first output terminal, configured to receive a first common mode voltage and a second common mode voltage when the gain amplifier is in a common mode, and generate one of the pair of differential output signals based on the first common mode voltage, the second common mode voltage and the pair of differential input signals when the gain amplifier is in an amplification mode;
• and
• a second conduction path, electrically connected to the second input terminal and the second output terminal, configured to receive a third common mode voltage and a fourth common mode voltage when the gain amplifier is in the common mode, and generate the other one of the pair of differential output signals based on the third common mode voltage, the fourth common mode voltage, and the pair of differential input signals when the gain amplifier is in the amplification mode.