Location History:
- Coulsdon, EN (1977)
- Coulsdon, GB (1980 - 1982)
- Sutton, GB (1989 - 1999)
- Surrey, GB (2002)
Company Filing History:
12 out of 138 
2 out of 215 
2 out of 42 Years Active: 1977-2002
Title: The Innovations of John O Drewery
Introduction
John O Drewery is a notable inventor based in Coulsdon, GB. He has made significant contributions to the field of display technology, holding a total of 15 patents. His work has had a lasting impact on how visual information is presented in various media.
Latest Patents
One of Drewery's latest patents involves color displays. He developed a plasma display device equipped with circuitry that modifies the red and blue color component signals. This modification compensates for the displacement of display elements or sub-pixels, ultimately increasing the ratio of the wanted signal to the alias spectrum. The circuitry includes an interpolator with transversal filters for the red and blue components. Additionally, when high-definition sources are used, the circuitry can be combined with down-converters, incorporating a transversal filter for the green color component signal as well.
Another significant patent pertains to the method of showing 16:9 pictures on 4:3 displays. This method processes 16:9 pictures for display on screens with a 4:3 aspect ratio. Each line of the television signal is compressed and/or expanded, allowing for a variable ratio of unprocessed to resultant signal length along the line. The processing is designed to maintain a good level of vertical detail while subjecting the image to slight vertical stretching, resulting in an acceptable level of distortion.
Career Highlights
Throughout his career, Drewery has worked with prominent organizations such as the British Broadcasting Corporation and Marconi Company Limited. His experience in these companies has allowed him to refine his skills and contribute to groundbreaking innovations in display technology.
Collaborations
Drewery has collaborated with notable individuals in his field, including Richard Storey and Arthur V Lord. These partnerships have fostered an environment of creativity and innovation, leading to advancements in technology.
Conclusion
John O Drewery's contributions to display technology through his patents and collaborations have significantly influenced the industry. His innovative approaches continue to shape how visual information is presented today.