Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
1998-09-30
2003-03-04
Hjerpe, Richard (Department: 2774)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S211000, C345S212000, C345S214000
Reexamination Certificate
active
06529190
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to the field of display devices, and more specifically, to a method and apparatus for monitoring and/or shutting down a power line contained therein.
2. Background Information
A monitor typically includes a power supply that delivers a plurality of direct current (“DC”) voltages to various circuits within the monitor. These DC voltages range from a high voltage (e.g., 180 volts) to a lower voltage (e.g., 5 volts). One of the lower DC voltages is referred to as the B+ power line, which typically provides power to various low voltage circuits contained within the monitor. To ensure safety within a monitor, a fuse is placed in series with the low B+ power line for providing overcurrent protection due to line shortages and the like. The monitor may also include other hardware circuitry for monitoring the low B+ power line for line shortages. However, this type of circuitry is expensive, unreliable, difficult to change during the design process, and difficult to recover from.
Accordingly, there is a need in the technology for a method and apparatus for overcoming the aforementioned drawbacks.
SUMMARY OF THE INVENTION
The present invention is a method and apparatus for monitoring and/or shutting down a power line in, for example, a display device. In one embodiment, a method comprises converting a voltage on a power line to a digital value, comparing the digital value with a predetermined value, and shutting down a power supply if the digital value is below the predetermined value for a predetermined amount of time.
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Jiang Libiao
Kawata Toshiro
Dinh Duc Q
Hjerpe Richard
Sony Corporation
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