New trend of touch screen industry: capacitive multi-finger touch solution

Author: ELAN Microelectronics to Cai Zheng

In addition to being widely used in the mobile phone industry, ELAN ’s capacitive touch screens are also used in MP3, MP4, PMP, DSC, PND and other products. Related international companies have also adopted them, such as HTC ’s. HD2 4.3-inch smartphones have recently been adopted in NetBooks and MIDs. The medium-sized capacitive touch screen is mainly for NetBook, NoteBook, Tablet PC, car screen, e-book and other related products. At present, in addition to the mass production of products under 5 inches, we have begun to develop 7-inch, 8.9-inch, 10.1-inch, 12.1-inch, 13.3-inch, 15.6-inch and other sizes. Some sizes are already available for sampling. These medium-sized capacitors The mass production plan of the touch screen in cooperation with relevant customers will be mass-produced in early 2010.

ELinger's proprietary capacitive multi-finger touch technology, eFinger, also known as "e finger magic", is a combination of MulTI-Finger operation and handwriting recognition of high-transparency capacitive touch panels. Transparency capacitive touchpad, in addition to direct handwriting input in Chinese and English, can also perform multi-finger operations, including multimedia applications (such as rotating, zooming, reducing charts, pictures and pictures), and multi-window applications (such as Open / close windows and switch windows, etc.). It can be mainly used in smart phones, multi-function phones, MID, MP3, PND / GPS, PMP, Windows 7 Notebook and Netbook, e-books and other products.

New evolution of control chip technology: capacitive multi-finger touch solution

In addition, ELAN has developed the Ghost free MulTI-Finger solution, which effectively solves the misjudgment problem when multi-finger touch, such as rotating the circle or map clockwise or counterclockwise without misoperation, can also be applied to Multi-finger operation applications such as guitar and piano. At the same time, it also cooperated with the exhibition of the world's only successfully developed capacitive pen product (eStylus), which opened the application field of using a small icon like QWERTY keyboard (Small Icon) and digital pen tablet on the capacitive touch panel, and can achieve personal writing Signature action.

For ELAN, which has its own technology control chip for capacitive touch screen, the technological evolution of the control chip is naturally a very important key. In this regard, ELAN has spared no effort to develop newer and better touch chip ICs that better meet market needs. In addition to the control chip IC, the optical performance, linearity, position drift and other issues related to the entire touch screen module have also made great progress. The technical research of these parts is not only about IC chips, but also involves materials, optics, and institutions. Technical improvements in other areas. The current technology maturity has been able to meet the performance requirements of customers of most related products. This trend can be seen from the increasing number of domestic and foreign manufacturers using capacitive touch screens as related product design applications. In addition, ELAN has developed various optical coating technologies to improve the optical effect of the optical touch module. Especially in the outdoor environment with strong light and e-book products without backlight, it can effectively enhance the display contrast and reflect the light. The rate has also improved very well.

Capacitive touch screens are unmatched by resistive touch screens in terms of smooth touch feel, light transmittance of touch screens, and strong resistance of panels. The reason why the resistive touch screen is still widely considered is mainly because the price is still low, but as the application rate of the capacitive touch screen becomes higher and higher, the price is expected to be closer. Therefore, the future development of capacitive touch screens is stronger and greater. For the "multi-finger operation" function of the main characteristics of the capacitive touch screen, although there are also related companies to introduce the matrix resistive touch screen control technology that can support multi-finger operation, the finger maneuverability will still have certain restrictions, For consideration, it should be only a transitional product under the price factor. In the future, the capacitive multi-finger operation application technology will still be the main.

Capacitive touch technology uses the weak charge induction of the human body or fingers to sense the position of the finger. Since the charge-induced change value is quite weak, the interference of various electromagnetic fields from outside is undoubtedly a great obstacle. These electromagnetic fields come from display screens, battery power circuits, RF antenna circuits, and other high-frequency high-voltage circuits, etc., which affect the popularization of capacitive touch screens. How the touch chip itself can effectively improve or filter out these interferences has also been a concern and improvement direction of related capacitive touch screen solution manufacturers.

At present, the latest Elastome touch control chip number is 1060. The chip adopts Flash type, which can be repeated online for many times to modify the design details. Its program memory capacity can reach 16KB to cope with larger size and more fingers to operate simultaneously (currently it can be defined to 10 fingers to operate simultaneously). The induction resolution is better, and at the same time there are better improvements in ESD, power consumption, and operating frequency.

At the end of 2009, Microsoft ’s Microsoft Windows 7 operating system was launched. Its multi-touch features immediately surprised the consumer market, and related technologies have become the hottest topic in the panel industry. It is expected that from small to medium-sized panels, from mobile phones, MID, PND to personal computers (AIO PC, Netbook, e-Book) and other information and communication products, the future will fully embark on the multi-touch application road, and Capacitive touch screens will lead the trend of the touch screen industry by virtue of their superior multi-touch characteristics and performance compared to resistive and other touch mode solutions.

——This article is selected from the “Perspective New Design Column” of the “Special Issue of Touch Technology” by Electronic Audiophile.com in October. Please indicate the source for reprinting.

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