| 摘要 |
<p>A portable prepaid card includes a substrate (14) on which a photoconductive layer (13), a liquid crystal layer (12), and a transparent electrode plate (11) are built up in this order. When an optical image is radiated on the photoconductive layer through the liquid crystal layer, the exposed regions and the unexposed regions of the photoconductive layer have different volume resistances. In this state, if a predetermined voltage is applied from the outside between the electrode plate and the photoconductive layer, a visible image corresponding to the radiated optical image is fixed in the liquid crystal layer.</p> |
