Thickness is an important factor affecting the performance of capacitive touch screens. In practical applications, glass thickness is one of the most common influencing factors.
First, the influence of glass thickness on capacitive touch
Signal-to-noise ratio
Signal-to-noise ratio is an important performance index of capacitive touch screen. The thickness of the glass will affect the signal-to-noise ratio of the capacitive touch screen. In general, the thicker the glass, the lower the signal-to-noise ratio. This is because increasing the thickness of the glass will cause the capacitance value to become smaller, which makes the signal weaker, and the noise will also become larger.
sensitivity
The thickness of the glass also affects the sensitivity of the capacitive touch screen. Within a certain range, the thinner the glass, the higher the sensitivity of the capacitive touch screen. This is because the touch principle of the capacitive touch screen is achieved by sensing capacitance changes in the human body. When the glass is thinner, the distance between the finger and the induction electrode is closer, and the electric field strength is larger, so the sensitivity is higher.
Anti-interference performance
The thickness of the glass also affects the anti-interference performance of the capacitive touch screen. Capacitive touch screens with thick glass usually have better anti-interference performance. This is because the increased thickness of the glass will reduce the interference of external noise, thereby improving the anti-interference performance of the capacitive touch screen.
Second, the solution
Optimal circuit design
When designing capacitive touch screens, signal processing can be optimized by adopting high-quality circuit design to improve signal-to-noise ratio and anti-interference performance. For example, differential input circuits, filters and other technologies can be used to reduce noise interference.
Selection of high quality induction electrode materials
The selection of the sensor electrode material will also affect the performance of the capacitive touch screen. Some high-quality induction electrode materials such as indium tin oxide (ITO) can improve the signal-to-noise ratio and sensitivity of capacitive touch screens.
Use multi-touch technology
Multi-touch technology can solve the influence of thickness on sensitivity. Multi-touch technology can improve sensitivity by sensing multiple touch points at the same time, even if the glass thickness is large, it can also achieve accurate touch operation.
Using better glass materials
When designing capacitive touch screens, you can choose better glass materials. Some high-quality glass materials, such as ultra-thin glass, tempered glass, etc., have a lower refractive index and dispersion, which can improve the transparency and sensitivity of capacitive touch screens.
Choose the right glass thickness
Finally, the performance of the capacitive touch screen can be balanced by choosing the right glass thickness. In practical applications, the thickness of the glass needs to be selected according to the specific application scenarios and requirements. In general, the thickness of glass between 0.7 mm and 2.0 mm is more common.
In short, glass thickness is an important factor affecting the performance of capacitive touch screens. In order to improve the performance of the capacitive touch screen, it can be solved by optimizing the circuit design, selecting high-quality induction electrode materials, using multi-touch technology, using better glass materials and selecting appropriate glass thickness.