Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1982-07-09
1986-04-15
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
357 13, 357 45, G09G 302, H01L 2990
Patent
active
045830878
ABSTRACT:
In order to provide a passive electro-optical display medium in a matrix display device with a sufficiently steep threshold with respect to the applied voltage and having a memory, a switching element (9) is placed in series having each picture element. The switching element (9) is provided between a picture electrode (6) of each picture element and a driving electrode (8). The switching element (9) is formed by a polysilicon island (20) in which n.sup.+ -doped regions (22,23) are provided which are separated by a p-doped region (21). As a result of this, two series-arranged, oppositely directed p-n junctions are formed of which one is always reverse biased. The width of the p-doped regions is so small that punch-through occurs between the two p-n junctions before one of the p-n junctions breaks down. Due to the occurrence of punch-through, the series resistance of the switching element is negligibly small so that a favorable R.sub.ON /R.sub.OFF ratio is obtained and the picture elements can be driven with comparatively low voltages.
REFERENCES:
patent: 4149174 (1979-04-01), Shannon
patent: 4223308 (1980-09-01), Baraff et al.
patent: 4247915 (1981-01-01), Bartlett
patent: 4251136 (1981-02-01), Miner et al.
patent: 4254427 (1981-03-01), Lohstroh
patent: 4373165 (1983-02-01), Tasch, Jr.
patent: 4405933 (1983-09-01), Avery
patent: 4434433 (1984-02-01), Nishizawa
Curtis Marshall M.
Kovalick Vincent P.
Kraus Robert J.
U.S. Philips Corporation
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