A PHOTOSENSITIVE ELECTROPHORETIC DISPLAY

摘要

A photosensitive electrophoretic display comprises pixels with an electrophoretic material (EF), and a photoconductor (PH) with a first side directed towards the electrophoretic material (EF). The pixels further comprises a first electrode (REl) and a second electrode (RE2) which both are transparent and which both are arranged at a second side of the photoconductor (PH) opposing the first side. In this construction, the photoconductor (PH) if not illuminated acts as a insulator and the electrical field in the electrophoretical material is defined by a voltage difference between the first electrode (REl) and the second electrode (RE2). If the photoconductor (PH) is illuminated, it acts as a conductor with a voltage level which is substantially the average of the voltage levels on the first electrode (REl) and the second electrode (RE2). Thus, dependent on whether the photoconductor (PH) is illuminated or not, different electrical fields occur in the electrophoretical material. These different fields are used to obtain different optical states of the pixels.