Photosensor and photosensor array

A photosensor array, comprising:

• (m×n) photosensor pixels arranged in an array;
• and
• n read lines,
• wherein each of the photosensor pixels includes:
• a lower electrode formed of a metal film;
• an amorphous silicon film disposed on the lower electrode;
• an n-type amorphous silicon film disposed on the amorphous silicon film;
• an upper electrode that is disposed on the n-type amorphous silicon film, and receives a first reference voltage;
• and
• a first transistor having a second electrode connected to a corresponding read line of the n read lines, a first electrode connected to the lower electrode, and a control electrode receiving a first clock,
• wherein each of the photosensor pixels whose first transistor is on outputs a voltage change to one of the read lines within one horizontal scanning period as a sensor output voltage of the photosensor pixels.

A photosensor array, comprising:

• (m×n) photosensor pixels and (m×1) compensation photosensor pixels arranged in an array;
• n read lines, and
• a compensation pixel read line,
• wherein each of the photosensor pixels includes:
• a lower electrode formed of a metal film;
• an amorphous silicon film disposed on the lower electrode;
• an n-type amorphous silicon film disposed on the amorphous silicon film;
• an upper electrode that is disposed on the n-type amorphous silicon film, and receives a first reference voltage;
• and
• a first transistor having a second electrode connected to a corresponding read line of the n read lines, a first electrode connected to the lower electrode, and a control electrode receiving a first clock,
• wherein each of the compensation photosensor pixels includes:
• a lower electrode formed of a metal film;
• an amorphous silicon film disposed on the lower electrode;
• the amorphous silicon film blocked from light;
• an n-type amorphous silicon film disposed on the amorphous silicon film;
• an upper electrode that is disposed on the n-type amorphous silicon film, and receiving a first reference voltage;
• and
• a second transistor having a second electrode connected to the compensation pixel read line, a first electrode connected to the lower electrode, and a control electrode receiving a first clock, and
• wherein each of the photosensor pixels outputs a voltage corresponding to the amount of light input to the amorphous silicon film as a sensor output voltage.