| 摘要 |
PURPOSE:To eliminate numerous function keys and to simplify the operability of a key telephone set by providing overlappingly a liquid crystal display panel and a transparent touch sensor to the key telephone set and controlling the set so that only the required information is displayed on the said display panel from a master set. CONSTITUTION:The key telephone set consists of numerous key telephone sets 10 and a master set 20, and the key telephone set 10 consists of the liquid crystal display touch panel 3, a transmission/reception circuit 9 and a liquid crystal drive circuit 5. The transparent touch sensor 1 is provided overlappingly on the liquid crystal display panel 2 in the liquid crystal display touch panel 3 and desired function selecting information is sent to the master set 20 by touching a finger on a part displayed blinkingly on the liquid crystal display panel. Further, the master set 20 sends individually only the required information to each telephone set 10 via a control circuit 7 and displays only the required information to the telephone set 10 via the liquid crystal drive circuit 5. |
