Color sensing method and device therefor
US4804833A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 1986 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Sep 5, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2003/507
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for sensing the color of incident light with a color sensing device, the color sensing device being a photoelectric device comprising an n-type or p-type amorphous silicon layer, being characterized in the following steps; measuring a first photocurrent of the photoelectric device generated by incident light when an electrical voltage having a predetermined parity is applied thereto; measuring a second photocurrent of the photoelectric device generated by the same incident light when another electrical voltage having a parity opposite to the predetermined parity is applied thereto, calculating the ratio of the first photocurrent to the second photocurrent; and identifying the color of incident light according to the ratio obtained. A color sensing device, comprising: two elements including an n-type or p-type amorphous silicon layer; an electric power source for applying a positive voltage and a negative voltage to the two elements at the same time, respectively; and a divider means for calculating a ratio of the two photocurrents which flows in each elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.