| US 7,605,830 B2 | ||
| Grayscale voltage generation device, display panel driver and display | ||
| Yoshito Date, Shiga (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Aug. 01, 2005, as Appl. No. 11/193,537. | ||
| Claims priority of application No. 2004-278227 (JP), filed on Sep. 24, 2004. | ||
| Prior Publication US 2006/0066602 A1, Mar. 30, 2006 | ||
| Int. Cl. G09G 5/10 (2006.01) | ||
| U.S. Cl. 345—690 [345/204; 345/87; 345/90; 345/92; 345/98] | 23 Claims |
| 1. A grayscale voltage generation device which has first and second modes, comprising:
a first line;
a second line;
a first selector for receiving a first reference voltage having a first voltage value, a second reference voltage having a
second voltage value and a third reference voltage having a third voltage value, supplying the first reference voltage to
the first line and the second reference voltage to the second line in the first mode, and supplying the third reference voltage
to the first line and the second reference voltage to the second line in the second mode; and
a plurality of serial digital analog converters (DACs), each of which receives grayscale information representing a grayscale
level and generates a grayscale voltage having a voltage value corresponding to the grayscale information using the reference
voltages supplied to the first and second lines,
wherein,
the first reference voltage has negative polarity with respect to the second reference voltage, and
the third reference voltage has positive polarity with respect to the second reference voltage.
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