Touch control arrangement for graphics display apparatus

Claim 1

In a touch control system for a display panel or other touch-controlled device which is capable of reciognizing touch positions along a predetermined coordinate axis on a touch surface, the apparatus comprising: a substrate having a touch surface capable of propagating surface acoustic waves such that a touch on said surface causes a perturbation of a surface wave propagating through the region of the touch; input surface wave transducer means acoustically coupled to said touch surface of said substrate and utilizable, when excited, for launching surface acoustic waves on said touch surface along a first path on said surface; and means including an array of surface wave reflective elements formed on said touch surface of said substrate along said first path for deriving from said surface acoustic waves a plurality of different wave components, each component being reflected from said array at a different location along the array, and for directing said components across said touch surface of said substrate in a progression of paths transverse to said coordinate axis; said array of elements comprising strips of a frit composition deposited on said touch surface.