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

Bichromal cylinders obtain improved brightness of gyricon display

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A gyricon display is based upon the use of optically anisotropic bichromal balls rotatable in an external electric field. A bichromal ball is located in a transparent elastomer layer within a cavity filled with a dielectric fluid. In a monolayer gyricon display, the bichromal balls cover 90 percent of the working display surface. Such coverage ensures high reflectance, so the display exhibits perfect contrast and brightness characteristics. However, dark portions present in the reflected light between bichromal balls imply a possible further increase in the display reflectance. Thus, the brightness characteristic of the surface in the reflected light may also be improved. Interstices between the balls may be filled with bichromal balls of smaller diameter. Such a configuration, however, complicates display fabrication and results in a tradeoff between light losses due to unfilled interstices and light losses due to absorption by the black hemispheres of the smaller interstitial balls. It is necessary to obtain an improved brightness for a gyricon display.
Using nonspheroidal bichromal particles instead of bichromal balls to improve the brightness of a monolayer gyricon display is proposed. Such nonspheroidal particles may be (for example) bichromal cylindrical particles. The bichromal cylinders are closely packed in a monolayer in parallel with one another. In the display, light is reflected from the monolayer of the closely packed cylinders of uniform diameter. A rectangular planar closely packed monolayer array of cylinders entirely or almost entirely (approaching 100 percent coverage) covers the plane. In the case of closely packed cylindrical particles, there is no need for adding interstitial particles of a smaller diameter between the particles of larger diameter. With the white faces of the cylinders exposed to an observer, little if any light can pass through the layer. For the closely packed cylinders, the portion of reflected light is maximized. Correspondingly, the display brightness is increased, or in other words, the brightness characteristic is improved. Therefore, a closely packed monolayer of bichromal cylinders makes it possible to improve the brightness of a gyricon display.
Additional information
With an improved display surface brightness, the brightness difference between black and white image portions in ambient light is greater. Correspondingly, the brightness and contrast characteristics may be improved. The fabrication of the proposed display is relatively easy with respect to other gyricon displays exhibiting high brightness. The cavities for accommodating the cylinders are made as small as possible with respect to the cylinders.
US Patent 6055091; Link >>
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