Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2007-12-11
2007-12-11
Dinh, Duc (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S211000, C345S690000, C345S100000
Reexamination Certificate
active
10421712
ABSTRACT:
A display driving device includes: a tone voltage generating circuit generating as many standard voltages as tones; and a DA converter circuit selecting one of the standard voltages in accordance with display data and outputting the selected standard voltage, and applies a tone display voltage to data signal lines of an active matrix scheme display panel. In the tone voltage generating circuit are there provided: a resistance dividing circuit generating as many standard voltages as tones, the standard voltages having voltage values between an upper limit voltage and a lower limit voltage; and an adjusting circuit generating the upper limit voltage and the lower limit voltage. A reference voltage regulated by an electronic volume control provided externally to the tone voltage generating circuit is supplied to the adjusting circuit, and both the upper limit voltage and the lower limit voltage are varied in accordance with the reference voltage. This makes it possible to provide a display driving device, as well as a display using it, which readily allows for changes in γ characteristics in accordance with the characteristics of the liquid crystal material and the liquid crystal panel without additional manufacturing cost.
REFERENCES:
patent: 6373419 (2002-04-01), Nakao
patent: 6762565 (2004-07-01), Kudo et al.
patent: 2002/0135575 (2002-09-01), Mizuno
patent: 2002/0186230 (2002-12-01), Kudo et al.
patent: 2001-022325 (2001-01-01), None
Korean Office Action issued on May 31, 2005 and English translation thereof.
Dinh Duc
Sharp Kabushiki Kaisha
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