Automatic brightness correction apparatus for image display device
CA 2257586 A1 · Owner: Fujiwara, Masanori · Inventors: Fujiwara, Masanori; Tsuzuki, Yoshiji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An automatic brightness correction apparatus for automatically correcting the brightness property of the image display device is configured to insert a test pulse at a predetermined level within a level range including an intermediate level to the video signal and display the image of the test pulse on the video image display device detect a deviation, of the brightness of the image of the test pulse displayed on the video image display device from a benchmark and correct the level, of the video signal based on the detected deviation
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 December 29, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 29, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 2020.
- 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.