| 摘要 |
A control device 2 for visual display apparatus 1 which has a display screen for displaying computer generated text and/or graphics comprises a co-ordinate array of touch switches overlaid with a surface which constitutes an active area 6 thereof which is "stroked" for effecting movement, e.g. of a cursor, on the display screen. The device detects successive operations of the touch switches and responds also to speed of operation of the switches to affect the rate of cursor movement. The coordinate array may comprise two spaced layers, each with a plurality of spaced conductive strips on its surface facing the other layer and with the two sets of strips at right angles so that the cross-over points of the two sets define the locations of the touch switches. The resolution of the array may be increased by detecting when two adjacent switches are operated simultaneously. The control device 2 may be remote from the display apparatus 1 with a cable or infra-red link 3. <IMAGE> |
