| US 7,532,180 B2 | ||
| Image display apparatus | ||
| Hideaki Yui, Kawasaki (Japan); and Akira Hayama, Atsugi (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Apr. 17, 2007, as Appl. No. 11/736,182. | ||
| Application 11/736182 is a division of application No. 11/156447, filed on Jun. 21, 2005, granted, now 7,230,386. | ||
| Claims priority of application No. 2004-191825 (JP), filed on Jun. 29, 2004; and application No. 2005-166897 (JP), filed on Jun. 07, 2005. | ||
| Prior Publication US 2007/0188526 A1, Aug. 16, 2007 | ||
| Int. Cl. G09G 3/20 (2006.01); G01G 3/10 (2006.01); H01J 1/52 (2006.01) | ||
| U.S. Cl. 345—75.2 [345/690; 345/55; 315/85] | 1 Claim |
| 1. An image display apparatus comprising:
a plurality of electron emission elements;
a plurality of fluorescent materials for emitting light by electrons emitted from the electron emission elements;
a spacer for keeping a space between the electron emission elements and the fluorescent materials; and
a correction circuit for calculating a halation correction value, which circuit comprises (a) a spacer shielded amount calculating
portion for adding electrons shielded by the spacer, and (b) a spacer reflected amount calculating portion for adding electrons
reflected by the spacer,
wherein the halation coffection value is calculated by subtracting (a) a product of an output value of the spacer reflected
amount calculating portion and a spacer reflected amount gain from (b) a product of an output value of the spacer shielded
amount calculating portion and a spacer shielded amount gain.
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