Display unit subject to ambient light having light-reflective an

Details Display unit subject to ambient light having light-reflective an Display unit subject to ambient light having light-reflective an

1987-11-30

1990-02-27

Brigance, Gerald

Communications: electrical

Visual indication

Movable

34081516, 34081517, 340971, 362 23, 362 31, 362 62, G08B 500

Patent

active

049049917

ABSTRACT:
A display unit has a transparent front panel one surface of which carries reflective markings that are illuminated by internal reflection in the panel from edge-mounted bulbs. Behind the panel are located light-emitting display devices such as provided by LED's. Illumination from the bulbs is controlled by manually adjusting a rheostat 36. The brightness of the display devices is controlled by means of two photodiodes. One photodiode responds to the level of ambient light falling on the front panel; the other photodiode is shielded from ambient light and responds to light from an additional bulb connected in parallel with the edge-mounted bulbs and having the same illumination characteristics. The brightness of the display devices is thereby automatically decreased when ambient light levels fall and increased when the markings are brightly illuminated, so that they are not masked by bright markings.

REFERENCES:
patent: 3668623 (1972-06-01), Csaposs
patent: 3754121 (1973-08-01), Delay et al.
patent: 3757511 (1973-09-01), Burgess et al.
patent: 3890614 (1975-06-01), Argentieri et al.
patent: 3992873 (1976-11-01), Awalt
patent: 4392750 (1983-07-01), Mettler
patent: 4622548 (1986-11-01), Andres et al.
patent: 4648690 (1987-03-01), Ohe

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