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Surface acoustic wave touch technology will become one of the main technology in the application of the vehicle touch

Since 1971, the first electronic touch screen has been developed, and all kinds of touch technology have emerged, including resistance, infrared, optical imaging, projection and surface acoustic wave. The world is still in a continuous touch boom will bring more new touch technology. So how to choose the right touch technology is a great challenge to the application vendors, and it is more so in the field of automotive touch application.

Engineers in the field of automotive touch application can be found by the use of the application of the touch technology. Although the resistive touch screen is used in the car GPS long ago, it has been plagued by poor working life, light transmittance, impact display picture quality, easy to produce a touch drift and so on. Infrared and optical image touch technology after a long time of development, it is still a large size of the market to occupy the leading edge. But in the outdoor car, the inevitable sun light irradiation can almost let rely on infrared and optical touch screen failure of the work of infrared and optical touch screen, in addition to the structure of the large large border, but also to bring great challenges to the integrated assembly.

　Projected capacitive touch technology has been a great success in the consumer market, such as smart phones and tablet PCs, but the application in the car touch, but also faces many challenges. First, the capacitive touch screen is used in the electromagnetic environment, which can not resist the interference of electromagnetic noise from other electronic components. Although it can improve the signal to noise ratio of the shielding measures or design improvements to a certain extent, the problem can not be solved, but also bring the cost of a sharp rise. In addition, the capacitive screen is composed of a multilayer transparent conductive (ITO) film, which may cause the structural delamination or the characteristics of the material to change in the high temperature impact of the vehicle, causing the failure of the touch. The solution of this problem must depend on the long-term innovation of the technology and materials.

Surface acoustic wave as a small number of access to the military has been successfully applied to the project of armored vehicles touch technology, has long been widely used in ATM machines, vending machines and other outdoor or public self-service equipment, strong and performance have been a strong proof. Its working principle is based on a shallow layer of the surface of the frequency of a certain mechanical wave, this mechanical wave of the car inside the complex electromagnetic environment can be achieved, touch the performance is not affected, the surface acoustic wave screen only by pure glass, transducer, wire and control card parts, with a high reliability; in the case of not being deliberately destroyed, surface acoustic wave touch screen can work stably for more than ten years, and the life of the car. In addition, the surface acoustic wave also has the natural support surface and the non rectangle shaped structure to touch the attribute, is helpful for the automobile manufacturer for the vehicle touching application innovation type design.

Although the application of surface acoustic wave touch screen in passenger car is still relatively small, but in the joint efforts of touch technology manufacturers and car manufacturers, the future of surface acoustic wave touch screen will become one of the main technology in the field of automotive touch.

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