| 摘要 |
A capacitive touch display apparatus includes a screen including a number of electrodes, a controller, a current detector, a switch, a high-frequency current oscillator, and a modulator-demodulator unit. When a capacitive screen of an external device is placed in contact with the screen, the current detector determines that the high-frequency current of one or more of the electrodes changes, and the controller switches the switch to connect the high-frequency current oscillator to the modulator-demodulator unit, and transmits desired data to the modulator-demodulator unit. The modulator-demodulator unit modulates the high-frequency current generated by the high-frequency current oscillator with the desired data. The modulated high-frequency current flows to the external device via the electrodes at a contact area between the screen of the apparatus and the screen of the external device. |
