Color active pixel sensor cell with oxide color filter

Details Color active pixel sensor cell with oxide color filter Color active pixel sensor cell with oxide color filter

Filed on

1997-05-02

Date issued

1999-08-31

Examiner

Abraham, Fetsum

Patent Class

Active solid-state devices (e.g., transistors, solid-state diode

SubClass

Responsive to non-electrical signal

SubSubClass

Electromagnetic or particle radiation

Other Related Categories

257232, 257233, 257234, 257257, 257258, 257432, 257437, 257789, 349 67, 349 97, 349104, 349105, 349106, 349113, G02F 11343, G02F 11335

Type

Patent

Status

active

Patent number

059457228

Description

ABSTRACT:
A color active pixel sensor cell is formed by utilizing four photodiodes which are each covered with a layer of oxide. The thicknesses of the layers of oxide are set so that a first layer of oxide prohibits red light from entering the first photodiode, a second layer of oxide prohibits green light from entering the second photodiode, a third layer of oxide prohibits blue light from entering the third photodiode, and a fourth layer of oxide allows visible light to enter the fourth photodiode. The amount of red light received by the cell is then determined by subtracting the light energy collected by the first photodiode from the light energy collected by the fourth photodiode. Similarly, the amount of green and blue light received by the cell is determined by subtracting the light energy collected by the second and third photodiodes, respectively, from the amount of light energy collected by the fourth photodiode.

REFERENCES:
patent: 4600833 (1986-07-01), Shibata et al.
patent: 4910570 (1990-03-01), Popovic
patent: 5479049 (1995-12-01), Aoki et al.
patent: 5548424 (1996-08-01), Takao et al.
patent: 5587818 (1996-12-01), Lee
patent: 5673127 (1997-09-01), Takahara et al.

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