Analysis of touch screen in car application

It took 15 years from the invention of the first electronic touch screen to the appearance of the first car with a touch screen central control, and 22 years have passed since the appearance of the first touch screen mobile phone. But now, the penetration rate of touch screens on smartphones has basically reached 100%, leaving the automotive industry far behind. The reason is that on the one hand, car manufacturers are far less concerned about mobile touch applications than the mobile phone industry, and more importantly, because the existing various touch screens face multiple challenges when used in automotive applications.

For cars parked outdoors in different regions and in different seasons, the temperature inside the car may be as low as -45 ℃ or as high as 80 ℃, and may also be accompanied by extremely high humidity. Some touch screens with multi-layer conductive film structure (such as resistive screen and capacitive screen), if no special treatment is taken, such an environment may cause structural delamination and moisture intrusion, and even cause the characteristics or shape of the conductive material to change and lose function . So we have reason to worry about whether the 17-inch capacitive screen on the Tesla car will still have a good touch experience after 2 years. In addition, the continuous vibration from the engine working, the bumps of the road surface and the direct sunlight in the outdoor are also challenges that cannot be ignored. For example, strong light will directly cause the infrared touch screen to fail.

Car manufacturers keen on electronic control technology integrate more and more electronic modules inside the car. When a large number of electronic modules work together in a small body space, a complex electromagnetic environment is formed, which most likely affects the reliability of the touch screen that works on the electromagnetic principle. Although strict shielding measures can improve the signal-to-noise ratio of this type of touch screen and improve reliability, it will inevitably increase additional cost and difficulty of assembly, while introducing more unreliable factors.

Cars have more stringent standards for safety. On-vehicle touch requires a high degree of accuracy and fast touch response, to avoid the driver's misoperation or slow touch response during driving, which will affect the safety of driving. The on-board touch screen itself must have sufficient structural strength to avoid injury to people in the vehicle in the event of a vehicle collision. Some touch screens with a multi-layer coating structure have poor light transmittance, which affects the driver's access to the displayed vehicle information and also indirectly threatens driving safety.

As a bulk durable product, the service life of the car is usually more than 10 years, or even 20 years, and the car touch screen should have a fairly reliable working life. The product life of the consumer market is usually 2 to 3 years, or even shorter. The touch screens commonly used in the consumer field, such as resistive screens and projected capacitive screens, can be processed through reinforcement and strengthening processes, but when applied to car touches with a harsher working environment, the working life is still an insurmountable obstacle.

The well-known automobile manufacturers have paid more and more attention to the development of the human-vehicle interaction system. In some conceptual models, we can even see the curved touch that fits the curved center console design and the rectangular shape design. All of these need better touch technology as support.

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