Analogue displays for electronic timepieces or meters

Details Analogue displays for electronic timepieces or meters Analogue displays for electronic timepieces or meters

1980-03-07

1982-07-27

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340754, 340765, 340784, 368242, G09G 336

Patent

active

043420303

ABSTRACT:
An analogue display with a panel having an electro-optic medium contained between two sets of electrodes. One set is arranged in a plurality of segments each divided into inner and outer portions. Each portion is planar and has a plurality of digits. The digits of one portion are interposed alternate with, and in between, the digits of the other. The other set has a planar meander configuration modified by an electrode interposed in its folds. The sets of electrodes when registered one over the other define two subsets of different selectable index positions. Selected alternating voltages are applied simultaneously to the electrodes maintaining the panel ON at two selected index positions and OFF elsewhere a dial shaped display area which is other than circular or arcuate, e.g. Preferably the voltages are selected from the set (+2V, +V, -V) of RMS magnitudes (2V.sub.c, V.sub.c, V.sub.c) where V.sub.c is equal to the threshold voltage of the panel. The panel may contain liquid crystal material, as medium, to perform as a dyed phase change, or twisted nematic effect device.

REFERENCES:
patent: 3525091 (1970-08-01), Lally
patent: 3540209 (1970-11-01), Zatsky et al.
patent: 3881311 (1975-05-01), Hama et al.
patent: 3934241 (1976-01-01), Weigert
patent: 3959963 (1976-06-01), Murrell
patent: 3987617 (1976-10-01), Slob
patent: 4079369 (1978-03-01), Fukumoto
patent: 4213294 (1980-07-01), Freeman
Conference Record of IEEE Biennial Display Research Conference, 24-26 Oct. 1978, pp. 59-61 (Gruebel et al).

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