Enhanced Hybrid Touch Screen Display for Industrial Applications

A Hybrid model with resistive touch and laser grid system is the solution proposed to rectify the problems faced by the existing industrial touch screen displays. Placing laser grid above the touch screen has improved the touch recognition and also reduces the possibility of erroneous inputs. Lasers and phototransistors are placed above the bezel of the display to form the laser grid. Laser grid forms a 2-dimensional co-ordinate system for navigation of input location on the display. In order to avoid unnecessary inputs caused by non-human entities like dust, flies, etc., inputs should be taken by both laser grid and resistive touch panel simultaneously. Touch input is taken into account only when the co-ordinates from both resistive touch screen and laser grid are the same. If not, co-ordinates from laser grid alone are taken to calibrate the resistive touch screen. If the calibration is not successful, then the touch functionality is fully taken over by laser grid system.