Understanding the design requirements is the most important first step in the design of touch products. Many providers in the touch screen supply chain often provide many different components that are confusing. More often, some providers unite to provide a value chain for end customers. What’s interesting is that the ecosystem is the same whether in the latest laptops or the latest Custom Capacitive Touch Glass phones.
The front panel or frame is the outermost layer of the end product. In some products, the outer frame encloses a transparent cover plate to avoid being affected by external harsh weather or humidity, and also to prevent the following sensing products from being scratched and damaged. Sometimes, the outermost frame simply covers the top of the touch sensor. In this case it is just a decoration.
Usually, the touch controller is a small microcontroller chip. It is located between the Custom Capacitive Touch Glass touch sensor and the PC/or embedded system controller. The chip can be assembled on the controller board inside the system. It can also be placed on a flexible printed circuit (FPC) glued to the glass touch sensor. The touch controller will extract information from the touch sensor. And convert it into information that the PC or embedded system controller can understand.
The touch screen “sensor” is a transparent glass plate with a touch-responsive surface. The sensor will place on the LCD. The touch area of the panel can cover the visible area of the display screen. There are many different touch sensing technologies on the market today. Each uses a different method to detect touch input. Basically, these technologies make current flow through the panel during touch. This produces a change in voltage or signal. This voltage change will be sensed by the Custom Capacitive Touch Glass touch controller. To determine the touch position on the screen.
The vast majority of touch screen systems are used on traditional LCDs. The LCD selection method for touch products is basically the same as in traditional systems. Including resolution, clarity, refresh speed, cost, etc. But another major consideration in touch screens is the radiation level. Since the technology in the touch sensor is based on the tiny electrical changes generated by the touch panel, an LCD that can radiate a lot of electrical noise is a difficult point in the design. Before selecting an LCD for use in a touch system, you should negotiate with the touch sensor provider.
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