Display device

Details Display device Display device

1999-01-06

2001-09-25

Pope, Daryl (Department: 2632)

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

C340S438000, C340S441000

Reexamination Certificate

active

06294990

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a display device f or a motor vehicle for displaying at least two related display parameters with the help of scale segments.
BACKGROUND INFORMATION
Conventional display devices are used, for example, to control the driving speed of a motor vehicle. The programmable setpoint referred to as the set speed for the automatic cruise control is set by depressing a set button, for example. This set speed is not usually displayed. There are embodiments wherein the desired set speed is shown on a separate display which is set apart from the conventional speed display.
SUMMARY OF THE INVENTION
The display device according to the present invention has the advantage over the related art in that the driver of the vehicle can easily view two related display parameters, in this case the instantaneous driving speed and the desired set speed, so that driving safety is greatly increased.
In a preferred embodiment of the display device, two separate lighting devices are provided, one of which is assigned to several scale segments of the display device and the other of which has individual lighting segments belonging to a single scale segment. In a display device of this type, the instantaneous speed can be displayed continuously, while the second lighting device can be used to show the speed value corresponding to the set speed. The scale segments showing the set speed are clearly distinguishable by color, contrast and/or brightness from the scale segments displaying the instantaneous speed .
In addition, an exemplary embodiment of the display device has a lighting device to which several scale segments are assigned and is preferred due to the fact that at least some, preferably all scale segments, have a switching device assigned to them which influences the optical properties of the scale segments. With a display device of this type, it is possible to emphasize individual scale segments through their optical properties so that they are clearly differentiated from the other scale segments and can be discerned easily. The driver of a vehicle with such a display device can easily read the current speed and at the same time can see the programmed setpoint or set speed.


REFERENCES:
patent: 4262255 (1981-04-01), Kokei et al
patent: 4308527 (1981-12-01), Moreau et al.
patent: 4647901 (1987-03-01), Teshima et al.
patent: 5309139 (1994-05-01), Austin
patent: 2447286 (1980-08-01), None
patent: 02 002038 (1989-01-01), None

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