Touch Panel Theory

Depending on the different sensor functions, touch panel are divided into ：

• Resistive：Pressing the flexible top sheet creates electrical contact between the resistive layers, essentially closing a switch in the circuit. The control electronics alternate voltage between the layers to get x then y touch coordinates.
• Capacitive：A bare finger or conductive stylus draws current from each corner of the electric field, creating a voltage drop that is measured to determine touch location.
• Acoustic Wave：These waves are reflected across the glass and received by sensors. A finger or other soft tipped stylus absorbs some of the acoustic energy and the controller measures the amplitude change of the wave to determine touch location.

Resistive touch panels are generally the most popular technology and divided into 4-wire, 5-wire or 8-wire resistive

• Silver Inks: PA591; PA585
• Dielectric Inks: UP316; UP283
• Pressure sensitive adhesive : PSA 710
• Conductive adhesives paste: BS86; BS25
• Antisotropic conductive adhesive : AI176