Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Reexamination Certificate
2000-09-08
2001-12-25
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
C315S291000, C315S169200, C315S169300, C315S077000, C340S870030, C345S084000, C345S204000
Reexamination Certificate
active
06333608
ABSTRACT:
SUMMARY OF THE INVENTION
This invention has been conceived in view of the background thus far described and its first object is to adequately perform dimming control in both daytime display period and nighttime display period.
Its second object is to adequately switch a dimming condition between a daytime display condition and a nighttime display condition.
Its third object is to achieve the first object and the second object at a same time.
According to a first aspect of the present invention, a display controller switches a display condition of the display unit between a daytime display condition and a nighttime display condition. Furthermore, the display controller controls the first dimming controller to dim the display unit during both a daytime display period and a nighttime display period. The display controller controls the second dimming controller to dim the display unit when the display condition of the display unit is switched between the daytime display condition and the nighttime display condition.
Since the display controller selectively performs the dimming control suitable for adjusting brightness range in accordance with the time, the place, and the occasion, the dimming control of the display unit can be adequately performed through daytime and nighttime.
According to a second aspect of the present invention, a driving frequency changing unit dims the display unit in plural dimming steps, during both a daytime display period and a nighttime display period, and a pulse width changing unit dims the display unit when the display condition of the display unit is switched between the daytime display condition and the nighttime display condition. In other words, in each of the daytime display period and the nighttime display period during which the dimming control is required to be performed in multi steps with a relatively small changing step, the dimming control is performed by changing the frequency of the scanning signals. In a switching of the display condition in which it needs to change the brightness in relatively large changing step, the dimming control is performed by changing the pulse width of the scanning signals.
Since the display controller selectively performs the dimming control suitable for adjusting brightness range in accordance with the time, the place, and the occasion, the dimming control of the display unit can be adequately performed through daytime and nighttime.
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Kawauchi Masaaki
Mase Noriyuki
Matsumoto Muneaki
Osada Masahiko
Denso Corporation
Law Offices of David G. Posz
Philogene Haissa
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