touch panel for GPS

touch panel for GPS Speciations: [Electrical] 1,MaximumCircuitRating:5voltsDC,35millianps 2,InsulationResistand a.Matrix20MΩormoreat50voltsDC b.Analog10MΩormoreat25voltsDC 3,DielectricWithstand:250VRms(50--60Hz1min) 4,Response:3msorless [Mechanical] 1,OpticsTransmission a.FilmtoFilm75%ormoreat550nmwavelenght b.FilmtoGlass82%ormoreat550nmwavelenght 2,Operationforce:10 100g 3,SurfaceHardness:3Hormore 4,Linerity:1.5%orless 5,StrokessLife:100,000cyclesormore 6,PercussionLife:1,000,000cyclesormore [Environmental] 1,OperationTemperature:-10oC +60oC 2,StorageTemperature:-20oC +70oC Descriptions: Resistive touch screen is the preferred solution for low cost applications. It is consisted by two layers: a conductive bottom layer (ITO Glass or Film) and a conductive top layer (ITO Film). these two are suspended by many mini-spacer dots. When a certain point is touched, the top layer contacts the bottom layer and a voltage charged by the controller is applied to the bottom layer's electrodes. The coordinate X axis of the touch point can be detected by measuring the voltage value thru the top ITO layer and the coordinate Y axis of the touch point can be detected in the same way by changing voltage input to the top layer's electrodes.