| US 7,531,788 B2 | ||
| Photosensor comprising light receiving elements and filters, and a corresponding target detection method and display panel | ||
| Takumi Yamamoto, Hino (Japan) | ||
| Assigned to Casio Computer Co., Ltd., Tokyo (Japan) | ||
| Filed on Oct. 15, 2007, as Appl. No. 11/974,629. | ||
| Claims priority of application No. 2006-281782 (JP), filed on Oct. 16, 2006. | ||
| Prior Publication US 2008/0087803 A1, Apr. 17, 2008 | ||
| Int. Cl. G06F 3/042 (2006.01) | ||
| U.S. Cl. 250—221 [250/226; 345/175] | 23 Claims |
| 1. A photosensor comprising:
a first light receiving element and a second light receiving element which detect light intensity;
a first filter which is disposed in front of the first light receiving element and which transmits light of a predetermined
color component and shuts off other color components which are different from the predetermined color component;
a second filter which is disposed in front of the second light receiving element and which shuts off the light of the predetermined
color component and transmits the color component other than the predetermined color component;
a light source which is disposed behind the first and second light receiving elements and which emits light including the
predetermined color component and not including the color component other than the predetermined color component; and
a judging unit for judging whether or not a detection target is present in front of the first and second filters based on
a transmission light intensity of the first filter which is detected by the first light receiving element and a transmission
light intensity of the second filter which is detected by the second light receiving element when the light is emitted from
the light source.
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