Pixel for processing signals having visible band and IR band, manufacturing method thereof, and pixel array and image sensor including the same

A method for manufacturing a pixel, the method comprising:

• forming a first pixel color filter layer for a first color in a first color region, a second color region, a third color region, and an IR region;
• removing the first pixel color filter layer from the second color region and the third color region;
• forming a second pixel color filter layer for a second color in the first color region, the second color region, the third color region and the IR region;
• removing the second pixel color filter layer from the first color region and the third color region;
• forming a third pixel color filter layer for a third color in the first color region, the second color region, the third color region, and the IR region;
• and
• removing the third pixel color filter layer from the first color region and the second color region,
• wherein the first color region, the second color region, the third color region, and the IR region are disposed on the same plane,
• wherein the first pixel color filter layer of the first color region, the second pixel color filter layer of the second color region, and the third pixel color filter layer of the third color region form a first color filter layer for transmitting a signal including a visible light and an IR,
• wherein the first pixel color filter layer, the second pixel color filter layer, and the third pixel color filter layer of the IR region form a second filter layer for transmitting a signal including an IR, in which a visible light is blocked;
• wherein the visible light transmitted by the first color filter layer is independently distinguishable from the IR transmitted by the first color filter layer due to a difference between the signal transmitted by the first color filter layer and the signal transmitted by the second color filter layer.

An image sensor comprising:

• a photo-sensing unit;
• and
• a pixel provided above the photo-sensing unit,
• wherein the pixel comprises:
• a first color filter layer comprising a first pixel color filter layer for a first color in a first color region, a second pixel color filter layer for a second color in a second color region, and a third pixel color filter layer for a third color in a third color region, wherein the first color filter layer is configured to transmit a signal including a visible light and an IR;
• and
• a second color filter layer disposed at one side of the first color filter layer, and comprising the first pixel color filter layer, on the second pixel color filter layer on the first pixel color filter layer, and the third pixel color filter layer on the second pixel color filter layer in an IR region, wherein the second color filter layer is configured to transmit a signal including an IR, in which a visible light is blocked,
• wherein the first color region, the second color region, the third color region, and the IR region are on the same plane;
• wherein the pixel is formed by:
• forming the first pixel color filter layer in the first color region, the second color region, the third color region, and the IR region;
• removing the first pixel color filter layer from the second color region and the third color region;
• forming the second pixel color filter layer in the first color region, the second color region, the third color region, and the IR region;
• removing the second pixel color filter layer from the first color region and the third color region;
• forming the third pixel color filter layer in the first color region, the second color region the third color region, and the IR region;
• and
• removing the third pixel color filter layer from the first color region and the second color region;
• and
• wherein the visible light transmitted by the first color filter layer is independently distinguishable from the IR transmitted by the first color filter layer due to a difference between the signal transmitted by the first color filter layer and the signal transmitted by the second color filter layer.