Backlighting system for displays
CA 2495531 C · Owner: Asahi Kasei Kabushiki Kaisha · Inventors: Shie, Rick L.; Savant, Gajendra D.; Wang, San Zhuang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An LED-based backlighting system that provides excellent brightness and homogeneity suitable for high performance multi~color and high resolution portable displays such as for PDAs and cell phones. Several different but similar embodiments are disclosed. Some are suitable for use with multiple LEDs (30) and some for use with a single LED (12). In a first such embodiment multiple LEDs are located adjacent the input edge of a light pipe (14). The input edge contains fixed pitch grooves to propagate the LED light in a direction that is substantially angled toward the bottom surface of the light pipe along its entire area. The light pipe (32) bottom surface also has grooves for altering …
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 July 26, 2003 and granted January 8, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 26, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 26, 2025.
- 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.