| 摘要 |
A system comprises a rollable sheet (SH) forming a loop. The rollable sheet has a first section (SHl) forming a first optically addressable bi-stable display and a second section (SH2) forming a second optically addressable bi-stable display, the first section (SHl) and the second section (SH2) are electrically isolated. A rotating unit rotates (SPl, SP2, Ml) said sheet (SH), wherein in a first position (Pl), the first section (SHl) is viewable while the second section (SH2) is hidden, and in a second position (P2), the second section (SH2) is viewable while the first section (SHl) is hidden. A changing unit (VGl, VG2, AD, CO) changes a first image on the first section (SHl) while displaying a second image on the second section (SH2) when in the second position (P2), and for changing the second image of the second section (SH2) while displaying the first image on the first section (SHl) when in the first position (Pl). |
