赛普拉斯真单层技术推进电容式触摸屏使用

赛普拉斯半导体日前开发出了真单层技术，以供该公司的TrueTouch触摸屏控制器使用。具体的细节将在本周于洛杉矶的SID(Society for Information Display)会议上披露。

传统的电容式触摸屏通过两层传感器来满足目前用户体验所要求的精度和线性度。赛普拉斯开发的专有算法可实现与真单层传感器无桥互连，无论是用户体验还是成本敏感性都足以媲美两层传感器的性能。

被去除的另一传感器层可以在传感器成本上节省移动设备制造商至少30%的成本，玻璃和薄膜层也一样。

据赛普拉斯触摸屏营销总监ohn Carey表示，目前为止市场上所谓的单层技术是基于使用菱形和雪花图形的制造工艺，需要一层绝缘层和一个昂贵的桥，见右图。

赛普拉斯表示，就算只有单一传感器层，TrueTouch解决方案也可提供精度高于1.25mm，良好的信噪比，80Hz响应时间以及有效功率3.6mW。

该技术被用于赛普拉斯CY8CTST241(单指触控)和CY8CTST242(增加了有限的两点触控如捏合(pinch)和缩放)，使触摸屏精度提高了约1mm，真单层传感器面板灵敏度也得到提升，同时降低了触摸屏中最昂贵的元件的成本。

该控制器使手机、相机、GPS及其他移动系统的制造商得以以低于电阻式触摸屏的成本来使用电容式触摸屏。

电容屏与电阻式触摸屏相比优点在于更直观的用户体验，更好的透光率，更低的功耗，更高的可靠性以及更耐用。据Carey表示，目前许多低价功能手机考虑到成本因素都不会选用电容式触摸屏。“新的TrueTouch单传感器层为新的功能手机和低成本智能手机开辟了电容式触摸屏手机的道路，特别是在中国和印度这样的主要市场。”

编译：Aileen Zhu

点击参考原文：SID: Single layer technology boosts capacitive touchscreens

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SID: Single layer technology boosts capacitive touchscreens

Colin Holland

Cypress Semiconductor Corp. has developed what its calls a true single layer enabling technology for its TrueTouch touchscreen controllers and is revealing details at this weeks Society for Information Display conference in Los Angeles.

Traditional capacitive touchscreens use a two-layer sensor to deliver the accuracy and linearity required for today’s user experience. Cypress has developed proprietary algorithms that interface with a true single-layer sensor with no bridges to deliver two-layer performance for an unparalleled combination of user experience and cost sensitivity.

The removal of this second sensor layer can save mobile device manufacturers 30 percent or more on sensor costs, and is available for glass and film.

According to John Carey, Director of Touchscreen Marketing at Cypress, what has been described as single layer technology up till now has been based on a manufacturing technique that uses diamond and snowflake patterns require a layer of insulator and an expensive bridge - see graphic on right.

Cypress says that even with only one sensor layer, the TrueTouch solution delivers accuracy better than 1.25 mm, good signal-to-noise ratios, a response time of 80Hz, and active power of 3.6mW.

The technology is used in the Cypress CY8CTST241 (single-touch with one-finger gestures) and CY8CTST242 (adds limited two-finger gestures such as 'pinch' and 'zoom') delivers improved performance touchscreen accuracy of around 1mm and responsiveness with a true single-layer sensor panel, reducing the cost of the most expensive component of the touchscreen.

The controllers should enables manufacturers of handsets, cameras, GPS systems and other mobile systems to use capacitive touchscreens at the lower resistive touchscreen costs.

Capacitive advantages over resistive touchscreens include a more intuitive user experience, better transmissivity, lower power, increased reliability and better durability. According to Carey, many lower-priced feature phones do not offer capacitive touchscreens today because of the cost. "The new TrueTouch single-layer sensor opens up new 'feature phones and lower-cost smartphones to capacitive touchscreens, especially in major markets such as China and India."

The controllers are suitable for screen sizes of 2.0 to – 3.5 inches and Carey says that multiple devices could be used for larger touchscreens and Cyrpress has a history of moving from multi-controller implementations to single device solutions. The company's CY8CTMA884 is a single-chip tablet solution for touchscreens up to 11.6 inches.

The CY8CTST241 and CY8CTST242, which both provide QWERTY keyboard support, are available today for lead customers in QFN and CSP packages. The CSP measures 2.2mm x 2.32mm and has 30 balls. Active power is 3.6mW, low power current is 0.7mA, deep sleep current is 100nA and the refresh rate is 110Hz.

编译：Aileen Zhu