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Touchscreen Controller Improvements are Leading to new Smartphone Sensor / Display Designs

by Stephen Entwistle | 9月 30, 2014

Leading TSC vendors Atmel, Cypress and Synaptics have developed bespoke noise reduction techniques which are enabling new display implementations able to accommodate multi-finger touches and 3D gestures, including touch detection through gloves, hovering, tracking wet or sweaty fingers accurately across the screen as well as providing fine-tip stylus support.

The smartphone handset OEMS faced cut-throat competition and needing to differentiate their products, are introducing larger and more sophisticated screens with new and advanced touch capabilities. This is placing an increasing burden on touchscreen controller (TSC) suppliers, who must design their products to meet ever more stringent technical specifications.

Altering the physical and electrical properties of touchscreens and accommodating advanced new features means that state-of-the-art TSCs increasingly need to have faster scanning and higher data processing capabilities, more sophisticated power management to minimize power consumption and, in particular, much improved signal-to-noise ratios.

  • The latest touchscreens are able to accommodate multi-finger touches and 3D gestures, including touch detection through gloves, hovering, tracking wet or sweaty fingers accurately across the screen as well as providing fine-tip stylus support.  TSCs now use advanced algorithms to detect these very small signals whilst rejecting the larger, unwanted signals from the user’s hand, from power supplies and other noise sources.
  • The display, particularly an LCD display, is a major source of noise, and the introduction of new integrated sensor/display designs exacerbates this problem. Leading TSC vendors such as Atmel, Cypress and Synaptics have developed bespoke noise reduction techniques which are enabling new display implementations such as display-integrated in-cell and on-cell touch systems and even single-layer in-cell sensor designs.


Further Client Reading:  Clients of Strategy Analytics Handset Component Technologies (HCT) service can read the full Insight report “Touchscreen Controllers: Enabling New Features and Advanced Capabilities in Smartphone Designs

Steve Entwistle

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