Infrared technology can realize multi points touch,especially in IR touch screen frame.Infrared touch screen works by installing infrared transmitter and receiver tubes around the bezel of the screen.When the touch action occurs, the touching object (such as the finger) will block certain infrared rays, and the system determines the position of the touch point by analyzing the occlusion of these rays.For multi points touch, it mainly relies on complex algorithms and a sufficient number of infrared transmit and receive pairs to achieve.For example:in a well-designed infrared touch screen overlay device,when two fingers touch the screen at same time,two different sets of infrared rays will be occluded.System can quickly recognize the position corresponding to these two groups of occluded infrared rays to determine that it is two touch points and realize two-point touch.If you want to increase touch points,as long as the layout of the infrared emitter and receiver tube is reasonable enough, high enough density, and with efficient and accurate calculation algorithm,you can realize more points touch.For example:it can support ten or even more points of touch operation in some higher infrared touch electronic whiteboard or large touch devices.However, the performance of infrared touch screen overlay to realize multi-touch will also be limited by some factors.For example:The quality and accuracy of the infrared emitting and receiving tubes will affect the accuracy of the judgment of the touch point position.The unstable infrared of the transmitter tube or the low sensitivity of the receiver tube and the excessively strong infrared components in the ambient light may lead to the misjudgment of the touch point position of the infrared touch screen or the inability to identify multiple touch points, affecting the multi-touch effect.