Separated unit pixel preventing sensitivity reduction and the driving method using the unit pixel

A method of driving a separation type unit pixel,

• wherein the separation type unit pixel comprises:
• a substrate:
• a photodiode constructed with a junction of a P-type diffusion area and an N-type diffusion area which are formed under a surface of the substrate in a vertical direction;
• a gate electrode conductor which is disposed on an upper portion of the surface of the substrate to be adjacent to the N-type or P-type diffusion area;
• a floating diffusion area formed to be adjacent to another surface of the gate electrode conductor;
• and
• a sensitivity reduction preventing conductor disposed on an upper portion of the photodiode area to cover the photodiode area,
• wherein the gate electrode conductor is applied with a transfer control signal, and the sensitivity reduction preventing conductor is applied with a sensitivity reduction preventing signal, and
• wherein the sensitivity reduction preventing signal is enabled when the transfer control signal is in a disabled state, disabled after the transfer control signal is enabled and a predetermined delay time elapses, and enabled again after the transfer control signal is disabled and a predetermined delay time elapses, and wherein light is incident from a lower portion of the substrate and an epitaxial substrate is disposed on an upper portion of the substrate.