LCD touch screen control positioning system: LCD touch screen has become popular, and has gradually become the mainstream of today s configuration. Touch screen is divided into resistors, capacitors, surface acoustic wave, infrared scanning and vector pressure sensor touch screens, which use the most is the four-or five-wire resistive touch screen. Four-wire resistive touch screen is made up of two transparent membrane consisting of resistance, in its horizontal and vertical line resistance imposed voltage, can be through the A/D conversion panel measured in the contact voltage, which corresponds to the coordinate values.

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