| 摘要 |
PURPOSE:To provide the display device which can distribute dirt on the surface of a touch panel by moving the operating key position of the touch panel to another position on a display screen at suitable time. CONSTITUTION:Plural pictures patterns A, B and C for touch panel are provided and by exchanging the above-mentioned picture patterns A, B and C at the every arbitrary number of times for operations, the operating key position is charged so as to prevent dirt from being concentrated onto the touch panel surface of a CRT display. |
