At present, the most widely used touch screens for industrial Panel PC are resistive touch screens and capacitive touch screens.
Capacitive touch screens use touch sensors to generate induced voltages on conductors on the screen, thereby generating relative currents, and measuring touch points by distance. In a low temperature environment, the surface of the palm skin has a low water vapor content and poor conductivity, which affects the performance of the sensor, causing the industrial Panel PC to fail to recognize the touch position and the touch to malfunction. The working temperature of the capacitive touch screen is usually -5 ° C to 60 ° C, which makes industrial Panel PC easily affected in northern regions.
Compared to capacitive touch screens, resistive touch screens are less affected. On the one hand, because of the different processes used, the micro-circuit on the touch screen is used to switch on the work, which is less affected by the temperature. On the other hand, the technology level of the resistive screen is relatively mature, and the materials used are durable and can be used. The working temperature of the resistive touch screen is required to be between -20 ° C and 65 ° C, so that the industrial tablet computer can meet most of the use environment.
In addition, industrial Panel PC are more commonly used with infrared touch screens and indicating acoustic screens.
The accuracy of the infrared touch screen is completely immune to the interference of current, voltage and static electricity, which is suitable for various light pollution environmental conditions. However, the infrared touch screen is limited due to its single sensor, which is easily damaged and aging, and the touch interface cannot withstand pollution, destructiveness, and complicated maintenance. When the temperature is low, the static electricity generated during the use of the touch screen easily attracts dust, which affects the use of industrial Panel PC. Suitable for use in aerospace.
It shows that the acoustic wave screen has high definition and good light transmittance, and the light transmittance can reach 92%. Highly durable and good resistance to damage. The accuracy is completely independent of environmental factors such as temperature and humidity, and only needs to be calibrated once during installation. The third axis (ie the pressure axis) responds. In contrast, the cost of construction and maintenance costs are also high. The surface acoustic wave screen requires frequent maintenance. If dust, oil or even liquid contaminates the surface of the touch panel of an industrial Panel PC, it will cause the wave guide grooves on the surface of the touch screen to block, causing the acoustic waves to not be emitted normally or the waveform to change, and the controller cannot correctly recognize it. Therefore, strict attention must be paid to environmental hygiene, and the surface of the touch panel of an industrial Panel PC must be wiped frequently to keep it smooth and clean, and regularly and thoroughly wiped.