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Building Tablet PC Applications by Philip Su, Rob Jarrett

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Digitizer Technology

Three popular types of digitizer technologies are in use today: resistive, electrostatic, and electromagnetic. The following sections describe these different technologies.

Resistive Digitizers

The least expensive type of digitizer is resistive. Resistive digitizers can have one or two layers. A single-layer resistive digitizer is made with a transparent film of known, predictable resistance (hence the name). Voltages can be applied at the four corners of the film. Because the film introduces even resistance across its surface, applying a voltage on one edge of the film creates a gradient of voltage across the entire film. Figure 2-3 shows how applying voltage at the corners can introduce such a gradient. When a single-layer ...

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