Capacitive touch buttons
I have been working on various applications of capacitive sensing since 1998. Most design activity in the late 1990s focused on capacitive touch buttons. Cypress developed robust methods for sensing very small changes in capacitance (femto farads), which we used to sense the presence or absence of a finger. The “killer application” for this technology was mechanical button replacement. We shipped literally 100s of millions of units into products such as the click wheel iPod, televisions, monitors and all manner of consumer electronics. I helped design capacitive buttons on laptops for large PC OEMs.
In 2006 capacitive touchscreens were virtually unheard of. The “smart phone” really did not exist. If you were born anytime in the last 20 years I’ll bet you don’t believe me. See this article. LG was selling an outrageously expensive “Prada” phone, but it was considered a doomed niche product. Nokia ruled the cell phone world with their ubiquitous candy bar form factor. Then in June 2007 Apple launched their iPhone and literally changed history. You know the rest. It is predicted that by 2020 80% of humans will have a touchscreen smart phone.
I was fortunate to be involved in this technology breakthrough. From 2007 to 2011 I managed touchscreen marketing and research for Cypress Semiconductor. We developed a line of capacitive touchscreen sensor ICs trademarked as TrueTouch®. (That was my idea by the way) During this time I had the opportunity to work with Cypress brilliant team of scientists and engineers in Ukraine and co-author several projective capacitive touchscreen patents as shown below.
|2012||20120105361||Capacitive stylus with palm rejection|
|2012||US20120105362||Synchronizing a stylus with a capacitive sense array|
|2012||US20120105362||Noise filtering devices systems and methods for capacitance sensing devices|
|2013||US849335||Capacitive stylus for a touch screen|
|2014||US20140085257||Capacitive stylus for a touch screen|
|Pending||Adaptive filter jitter system|
|Pending||Charger Noise Listener|
|Pending||Capacitve stylus with palm rejection|
|Pending||Synchronizing a stylus with a capacitive touch screen|
|Pending||Charger noise solution for touchscreen|