Liquid crystalline platen for an electrophotographic printing machine
Electrophoretic matrix panel
Electrophoretic image display having an improved switching time
Electrophoretic device Patent #: 4123346
ApplicationNo. 06/063634 filed on 08/02/1979
US Classes:359/296, Changing position or orientation of suspended particles359/317, Multiple reflections within cell359/318By reflection
ExaminersPrimary: Prescott, Arthur C.
Attorney, Agent or Firm
International ClassesG02F 1/01 (20060101)
G02B 26/02 (20060101)
G02F 1/315 (20060101)
G02F 1/29 (20060101)
G03G 17/00 (20060101)
G02F 1/167 (20060101)
G03G 17/04 (20060101)
AbstractAn electrophoretic display device comprises a cell in which a colloidal suspension of pigment particles is contained between associated electrodes and means are provided for the establishment of a potential between the electrodes for the selective transport of pigment particles. This potential permits changing the spatial distribution of pigment particles in specifically defined regions of the display cell. The device also comprises a light transmissive plate associated with the cell, whereby illumination received in the plate is internally reflected, with light coupling between the illumination and selected regions of the cell at which such particles are suitably disposed. The coupled illumination is transmitted by the cell to the observer. The cell regions at which the particles are disposed are switchably selectable.