IR Touch Screen installed on a Sony FW-85BZ30J. 10PT touch, CT Glass. Display Included. The TSItouch Infrared (IR) based solution allows for a high accuracy interactive experience. Infrared touch screens operate on the basis of light-beam interruption, commonly referred to as beam break, to determine the location of touch events. Infrared uses an array of X-Y infrared LED and photo detector pairs around the edges of the screen to detect a disruption in the pattern of LED beams. These LED beams cross each other in vertical and horizontal patterns.