Control system for a head-up display for automotive vehicles
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United States of America Patent
Stats
-
Apr 13, 1993
Grant Date -
N/A
app pub date -
Apr 12, 1989
filing date -
Apr 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A noise suppressing arrangement in the form of an interface is provided between a data transfer circuit and a driver associated with a display unit vacuum fluorescent display (VFD) tube. The driver and power supply circuits associated with the display unit feature improved arrangements which attenuate surges and spikes. The voltage appearing on the grid of the VFD is controlled by a circuit which is responsive to a signal produced by a microcomputer which controls the illumination and which induces changes in the voltages applied across the filament of the VFD. The level of illumination can be automatically controlled by light sensor and illumination levels above default values which are automatically reset to optimal values each time the system is initially energized.
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