Switch circuit of an image sensor for changing resolution and a method thereof

A resolution switch circuit of an image sensor for changing resolution, comprising:

• a plurality of image gathering units, respectively used to gather an image and generate accordingly a first image signal and a second image signal based on the image;
• a signal combining unit, connected to the image gathering units to combine the first image signals and combine the second image signals;
• a control unit, connected to the image gathering units and the signal combining unit to control the image gathering units and the signal combing unit;
• a plurality of shift registers, connected to the image gathering units to control the transmission of the first image signals and combine the second image signals to the signal combing unit;
• a resolution control unit, connected to the shift registers to generate at least one resolution control signal to control the shift registers for changing the resolution value;
• the image gathering units transmit the first and second image signals in form of charges to the signal combining unit by using circuit which has a switch and a power storage unit, wherein the image gathering units comprising;
• an optical signal converting unit, used to receive a first control signal of the control unit to gather the image and generate the first image signal and the second image signal;
• a second switch, connected to the optical signal converting unit to receive a second control signal of the control unit to store the first image signal in a first power storage element;
• a third switch, connected to the optical signal converting unit to receive a third control signal of the control unit to store the second image signal in a second power storage element;
• a fourth switch, connected to the second switch, the first power storage element and a first image output wiring to receive an output control signal provided by the corresponding shift register, the first image signal being thereby controlled to be transmitted to the signal combining unit through the first image output wiring;
• and
• a fifth switch, connected to the third switch, the second power storage element and a second image output wiring to receive the output control signal, the second image signal being thereby controlled to be transmitted to the signal combining unit through the second image output wiring.