New touchscreen technology aims to stifle electrical noise
June 13, 2011 // Paul Buckley
STMicroelectronics has unveiled the company's new FingerTip technology, which enables a single-chip solution for capacitive touchscreens up to 10 inches in diameter with multi-touch capability.
ST's MEMS sensors and FingerTip technology share a similar architecture, in which a sensing element is connected to a high-performance capacitance-sensing circuit. ST has applied its know-how in analog and mixed-signal interface technology to develop an innovative analog-front-end that is able to detect variations of capacitance in atto-Farads (10- F) and to immunize the system against noise.
Touchscreen applications are subject to noise coming from various sources, including the display, the system, human touch, or battery chargers. Low-cost and poor-quality chargers, in particular, are a source of noise that can be as high as tens of volts and can affect normal operations when a finger touches the screen. When this happens, a strong periodic noise - which could be in the range of 100 V (peak-to-peak) and in the frequency range from 1kHz to 1MHz - will enter into the touchscreen controller's analog front-end and result in 'false' finger touches.
The new FingerTip capacitive sensing technology with its powerful 32-bit DSP (Digital Signal Processing) engine is able to eliminate this sort of charger noise effect and reach higher immunity levels without reducing performance in terms of accuracy, frame rate and power consumption. FingerTip has also been designed to eliminate noises from displays and works with both 'in-cell' and 'on-cell' display technologies.
"Noise from battery chargers pose a special issue for touchscreens, resulting in a poor user experience," said Benedetto Vigna, General Manager of MEMS, Sensors and High Performance Analog Division. "Our leadership in analog capacitive interface IP, developed for MEMS sensors, will allow us to achieve higher noise rejection prior to digital filtering. This new FingerTip technology is able to achieve faster response time, low-power consumption and higher noise rejection required for high-end portable applications."
ST's new product family, based on the new technology, is under evaluation with major customers that can benefit from the FingerTip's: hand writing capability with a small stylus; fast response time; ultra-low power consumption; best linearity and accuracy in noisy conditions; and tiny package suitable for smart phones and 10-inch tablets.
Visit STMicroelectronics at www.st.com.
ARM backs printed electronics startup
January 26, 2015
PragmatIC Printing Ltd. (Cambridge, England), a pioneer of printed electronics founded in 2010 as a continuation of the Manchester ...
Infineon takes the lead in auto semiconductors
Harman continues shopping spree with two software takeovers
Pinpointing perovskite's ability to produce cheaper solar energy
Nanostructures key to organic solar cell efficiencies?
Essess completes Street View with IR heat maps
January 23, 2015
Back in 2011, Professor Sanjay Sarma from the Mechanical Engineering Department at MIT and Co-Founder of US startup Essess, ...
Technology available, application wanted
Open source to flood IT in 2015
Asia leads automotive innovation
- Sensing Elements for Current Measurements
- Investigating Die attach Failure in IGBTs using Power Cycling Tests
- Power Semiconductor Failure Diagnosis using Thermal Characterization and Power Cycling
- Top 5 Trends in Product Development and Test Engineering
InterviewCEO interview: Bosch's IoT startup is all about the system
Thorsten Mueller, CEO of Bosch Connected Devices and Solutions GmbH (Reutlingen, Germany), has been guiding the latest startup subsidiary of Robert Bosch GmbH since 2013 when he started the initiative ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
To ensure you have a good start in 2015, Freescale is giving away five of its QorIQ TWR-LS1021A Tower system modules, worth USD269 each, for EETimes Europe's readers to win.
The module is the most feature-rich and high-performance Tower system offered by Freescale, enabling compatibility and interoperability with the growing list of Tower expansion modules, offering an easily accessible...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.