Temperature compensation in greyscale addressing
CA 2176367 A1 · Owner: Lockmuller, Neil · Inventors: Lockmuller, Neil
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of addressing a liquid, crystal pixel which has a varying switching threshold (1, 3) over its area comprises blanking the pixel by means of a blanking pulse (6), switching on part (10) of the area of the pixel by means of a second pulse (8) and then switching off a part (14) of the area (10) which was switched on by the second pulse (8) by means, of a third pulse (12). The amount (14) of the pixel switched off by the third pulse has the same temperature dependence as the amount (10) switched on by the, second thus compensating for any change, in brightness or grey level which would otherwise occur.
Read the whole patent
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
- Filed November 8, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 8, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 8, 2016.
- 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.