Image sensor, level shifter circuit, and operation method thereof

A level shifter circuit, comprising:

• a first transistor, wherein a first terminal of the first transistor is coupled to a first voltage;
• a second transistor, wherein a first terminal of the second transistor is coupled to the first voltage, and a control terminal of the second transistor is coupled to a control terminal of the first transistor and a second terminal of the first transistor;
• a third transistor, wherein a first terminal of the third transistor is coupled to the second terminal of the first transistor, and a second terminal of the third transistor is coupled to a ground voltage;
• a fourth transistor, wherein a first terminal of the fourth transistor is coupled to a second terminal of the second transistor and an output terminal;
• a fifth transistor, wherein a first terminal of the fifth transistor is coupled to a second terminal of the fourth transistor, and a second terminal of the fifth transistor is coupled to a second voltage;
• and
• a sixth transistor, wherein a first terminal of the sixth transistor is coupled to the second terminal of the fourth transistor, and a second terminal of the sixth transistor is coupled to the ground voltage,
• wherein the output terminal is coupled to a pixel circuit, and the output terminal outputs a driving signal to the pixel circuit,
• wherein the first voltage is greater than the ground voltage, the second voltage is less than the ground voltage, the first transistor and the second transistor are P-type transistors, and the third transistor, the fourth transistor, the fifth transistor, and the sixth transistor are N-type transistors,
• wherein a control terminal of the third transistor receives a first enabling signal provided by a timing controller, and a control terminal of the fourth transistor receives a second enabling signal provided by the timing controller,
• wherein a signal waveform of the first enabling signal is inverted to a signal waveform of the second enabling signal, swings of the first enabling signal and the second enabling signal are from the ground voltage to a third voltage, and the third voltage is less than the first voltage.

An operation method of an image sensor, wherein the image sensor comprises a timing controller, a potential dropper, a pixel circuit, and a pixel driving circuit, and the pixel driving circuit comprises a first transistor, a second transistor, a third transistor, a fourth transistor, a fifth transistor, and a sixth transistor, the operation method comprising:

• providing a first enabling signal to a control terminal of the third transistor, and providing a second enabling signal to a control terminal of the fourth transistor by the timing controller, wherein a signal waveform of the first enabling signal is inverted to a signal waveform of the second enabling signal;
• providing a first control signal to a control terminal of the fifth transistor, and providing a second control signal to a control terminal of the sixth transistor by the potential dropper, wherein a signal waveform of the first control signal is inverted to a signal waveform of the second control signal;
• and
• outputting a driving signal to the pixel circuit by an output terminal coupled to a first terminal of the fourth transistor.