Electrophoretic display having reduced writing time

Details Electrophoretic display having reduced writing time Electrophoretic display having reduced writing time

G - Physics

09

G

G09G 3/20 (2006.01) G09G 3/34 (2006.01)

Patent

CA 2170263

An electrophoretic display (10) is provided which enables an image to be displayed by selectively energizing intersecting grid (16) and cathode (14) lines each indicative of a pixel and varying the bias between the lines to cause suspended pigment particles to migrate to an anode (20) and away from the energized pixels. Selected intersections of grid (16) and cathode (14) lines indicative of pixels are energized with a set of voltages during a fixed time interval, thereby causing an image to be displayed thereon. The time interval selected is less than the time required to completely remove the pigment particles from the pixels and the image is sequentially enhanced by rewriting at least some of the pixels with the set of voltages at least once. This permits a readable image to be produced much more rapidly and also provides incrementally darker pixels in the image as additional pigment particles are moved from selected intersections during subsequent energizing intervals.

Affichage électrophorétique (10) assurant la production d'une image en mettant sous tension sélectivement des lignes de grille (16) et de cathode (14) dont chacune des intersections définit un pixel, et en faisant varier la polarisation entre les lignes de façon à amener les particules de pigment en suspension à migrer vers une anode (20) en s'éloignant des pixels alimentés. Des intersections sélectionnées de lignes de grille (16) et de cathode (14) représentant des pixels sont soumises à des séquences de tension pendant un intervalle fixe de temps ce qui produit une image. L'intervalle de temps choisi est inférieur au temps nécessaire pour que les pigments quittent les pixels et l'image est ravivée séquentiellement en resoumettant au moins une fois certains des pixels à des séquences de tension. Cela permet de produire une image lisible beaucoup plus rapidement et d'obtenir des pixels à noircissement incrémentiel puisque les pigments additionnels quittent les intersections sélectionnées pendant les intervalles subséquents de mise sous tension.

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