| 摘要 |
In connection with a display apparatus that is held and swung by an operator to display images of pictures, letters, etc. in space using an afterimage effect, a party situated opposite to the operator is enabled to recognize the images displayed always at the central position of the swing range and with the same dimensions irrespective of the swinging speed and to see the same images displayed even of an asymmetrical pattern irrespective of the directions of the swing of the apparatus. The display apparatus has a transparent protective case covering both side faces, right and left, of an array of LEDs, a measuring unit to measure the cycle time of right and left reciprocating motion, a computing unit to process by computation the measured cycle time, a memory unit to memorize the processed results and a timer circuit unit to control turning the LEDs on and off. This set-up enables a party situated opposite to the operator of the display apparatus to see correct images of letters and pictures displayed always at the center of the swinging width range regardless of the swinging speed.
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