| 摘要 |
PURPOSE:To back up the defect of a display device provided previously and to facilitate the easy read-out of the display device by providing an another display device to a portable terminal device in addition to an existing display device. CONSTITUTION:An LED display device 1 is connected to a portable terminal device which is usually used just with a terminal device 3 via a connector 5 in case the contrast of liquid crystal display device LCD4 is made difficult to see owing to an environmental change. Then the display contents of the LCD4 are displayed to an LED display device 2. The data is transferred by a serial interface 12 provided in a standard way to the terminal 3. A CPU10 transfers the contents displayed to the device 4 to the device 1 via a controller 13 in the form of the serial data. A controller 7 of the device 1 sends the data sent from a serial interface 8 to the device 2 via an LED driver 6 to switch on the device 2.
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