| US 7,468,639 B2 | ||
| Modulation circuit, driving circuit and output method | ||
| Kazuhiko Murayama, Atsugi (Japan); Tatsuro Yamazaki, Machida (Japan); and Osamu Sagano, Inagi (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jun. 28, 2005, as Appl. No. 11/167,206. | ||
| Claims priority of application No. 2004-193936 (JP), filed on Jun. 30, 2004; and application No. 2005-175119 (JP), filed on Jun. 15, 2005. | ||
| Prior Publication US 2006/0001500 A1, Jan. 05, 2006 | ||
| Int. Cl. H03K 7/08 (2006.01); G09G 3/36 (2006.01) | ||
| U.S. Cl. 332—109 [315/169.3; 345/89; 345/97] | 21 Claims |
| 1. A modulation circuit that outputs a modulation signal, said modulation circuit comprising:
a memory circuit that stores waveform data that determines a time width of a portion having a predetermined amplitude value
of the modulation signal in advance; and
a circuit that generates the modulation signal based on the waveform data and input gradation data,
wherein the waveform data includes (a) data that determines a timing of start of a control operation to perform a transition
from another amplitude value to the predetermined amplitude value, and (b) data to determine a timing of start of a control
operation to perform a transition from the predetermined amplitude value to another amplitude value.
|