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Function-oriented Knowledge Base \ Electronic paper \ Improve image quality of paper-like display

Twisting balls provide fast response of flat panel display

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Image forming in a panel electrophoretic display is based upon the electrophoretic movement of color pigment particles in a dielectric liquid layer enclosed between two electrodes, one of which is transparent. The image also persists after electric potentials have been removed. In an addressable-matrix electrode panel, one coordinate potential is supplied to a conducting line of a trough structure containing colored particles of electrophoretic ink of a given polarity in the dielectric liquid. At the same time, another coordinate potential is supplied to the upper transparent conductor. Each pixel of the panel is visible through the transparent conductor with natural lighting. Due to the action of an electric field between the electrodes, the electrophoretic particles migrate towards one of the conductors, thereby creating a colored image. However, the migration of an electrophoretic particle through the layer width is relatively slow. As a result, the display state also changes slowly. It is necessary to provide a fast response in a flat panel display to control the potential during the image change.
Rotating twisting balls may be used instead of the linear migration of particles to provide a fast response in a flat panel display. Each twisting ball particle is located inside a spherical cavity in a transparent support material. The diameter of the spherical cavities is a little larger than the twisting particle diameter, so that the particle has rotational freedom without translation freedom. The gap between the twisting particles and the cavity wall is filled with an optically transparent dielectric liquid. The twisting particles exhibit electrical anisotropy due to hemispherical surface coatings of different Zeta potentials and their distribution in the dielectric liquid volume. The particles also have the optical anisotropy of these hemispheres. The optical anisotropy manifests itself in the difference in the hemispheric surface coatings, either in their color or their other optical properties. An external electric field causes the particles to rotate in accordance with their optical anisotropy. Because the particle rotation can be performed more rapidly than the linear movement of its mass, the display response as a whole becomes faster. Thus, twisting the balls provides a fast response in the flat panel display.
Additional information
The size of two-color balls may range from 0.05 millimeters to 0.5 millimeters. The response of a two-color ball (180 degree rotation) to the applied electric field is a threshold. Until a threshold voltage is reached, the ball remains stationary.
US Patent 4126854; Link >>
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