Display device
CA 1181513 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Van De Venne, Joannes L.M
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to provide a passive electro-optical display medium in a matrix display device with sufficiently steep threshold with respect to the applied voltage and with a memory a switching element, is palced in series with each picture element. The switching element is provided between a picture electrode of each picture element and a driving electrode. The switching element is formed by a polysilicon island in which n+-doped regions are provided which are separated by a p-doped region. As a result of this, two series-arranged oppositely, directed p-n junctions are formed of which always one is reversely biased. The width of the p-doped regions is so samll that punchthrough occurs between …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 22, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 22, 2002.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.