The difficulty of Infrared touch screen technology
Environmental factors of light: The operational parameter of infrared receiving tube has minimum sensitivity and maximum light intensity, but the touch screen products can not limit the range of application ; , from dark karaoke rooms to Island high intensity of sunlight, as a product, it must adapted to Environmental.Rapid detection： in generally the infrared touch screen was at least infrared touch screen is the least size has 64 sets of infrared tube, which means that at least 0.4 milliseconds to complete an infrared detection.Reflection around, refraction, interference, infrared emission tube having a launch angle, the reception has a wide range of acceptance angle, if the surrounding reflection to a measure, you will find that the finger placed in any place .can’t block signal.To solve these problems, the best choice is to improve the resolution ratio (R.P.) of the touch screen, but the ability to resist interference is better than that of the pulse mode,although capability of Anti-interference strength when select pulse mode, but this is have a big work problem that Corresponding speed of Signal Receiver (so there is a need for a fast speed in the receiver).but the Touch screen demand too fast .so These technological breakthrough are necessary to us in adaptive circuit, MCU software, mold design, translucent material selection and other aspects.
On the other hand Infrared touch screen by the infrared emission receiver to work,the performance and life of the infrared tube is was confident, any block of light can be triggers the touch screen responses. but the infrared touch screen using a lot sensors (is nearly 100 pairs), and shared peripheral circuit, which requires the sensor not only good performance, but also for 100 pairs of infrared diode “light resistance characteristics” and “junction capacitance” are consistent.
To sum up ，Infrared touch screen technology looked a bit hard. But With the development of science and technology .People will have overcome all difficulties to research and advance their Infrared touch screen.