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(11) | EP 0 971 336 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Apparatus and methods for selective imaging in nonemissive display systems |
| (57) A writing head (100) capable of rapidly and efficiently generating high field gradients
while remaining amenable to low-voltage control utilises a piezoelectric (110) or
Rosen transformer. A one- or two- dimensional array of such writing heads may be used
to address a substrate (127) bearing an arrangement of electrically responsive, nonemissive
display elements (125), applying an image pattern thereto. Similarly, the array of
writing heads can be used to remove an image, returning the substrate (127) to its
original unimaged state. |