| US 7,491,927 B2 | ||
| Color sensing circuit employing charge storage device | ||
| Boon Keat Tan, Penong (Malaysia); Chi Mun Ho, Taman Bunga Blossom (Malaysia); and Len Li Kevin Lim, Perok (Malaysia) | ||
| Assigned to Avago Technologies ECBU IP (Singapore) Pte. Ltd., Singapore (Singapore) | ||
| Filed on Jun. 24, 2004, as Appl. No. 10/877,864. | ||
| Prior Publication US 2005/0285017 A1, Dec. 29, 2005 | ||
| Int. Cl. G01J 3/50 (2006.01) | ||
| U.S. Cl. 250—226 [250/214 R; 356/402; 356/425] | 20 Claims |
| 1. A color sensing circuit for one of identifying a color, measuring a color, and color control comprising:
a) a light detector to receive light and to generate a signal that is dependent on received light; wherein the light detector
includes a first electrode coupled to a first node and a second electrode coupled to a second predetermined signal;
b) a storage device that includes a first electrode and a second electrode; wherein the second electrode is coupled to the
second predetermined signal;
c) a first switch to selectively couple the first node with the first electrode of the storage device based on a charge control
signal;
d) a signal processing circuit that includes a first electrode, a first output that generates a first color signal, and a
second output that generates a second color signal; and
e) a second switch to selectively couple the first electrode of the storage device with the first electrode of the signal
processing circuit based on an evaluate control signal; wherein the signal processing circuit selectively asserts the charge
control signal and evaluate control signal.
|