Patent ID: 8847926

Claim:
A touch panel, comprising: a substrate having a first side, a second side, a third side, and a fourth side, each having two ends and together defining a surface; an X-axis transmitting transducer located near one end of the first side on the surface; an X-axis receiving transducer located near the other end of the first side on the surface; a Y-axis transmitting transducer located near one end of the second side on the surface; and a Y-axis receiving transducer located near the other end of the second side on the surface, wherein the substrate comprises a matte surface continuously associated with the third side between the surface and the third side for diffusing a surface acoustic wave transmitted by the X-axis transmitting transducer, wherein the matte surface continuously associated with the third side is rough and uneven by abrasion or etching, and wherein the material of the matte surface is as the same as the material of the substrate.