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

Microstructure with reflective corona enhances image contrast of gyricon display

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In a monolayer gyricon display with a maximal packing density of bichromal twisting balls, the balls are placed directly in a dielectric fluid. The balls and the dielectric fluid are sandwiched between two electrode substrates. A gyricon display with a closely packed monolayer exhibits light reflectance that surpasses that of a multi-layer display. The primary problem of a monolayer gyricon display with closely packed balls is that the balls can not be packed together to completely fill the area of the display due to the interstices between them. In addition, regardless of which microstructure is used and how the balls are packed, the balls often can not exactly rotate to the precise orientation with the desired color facing the viewer. The unfilled spaces between the balls and the incomplete rotation of the balls result in each ball being surrounded by a peripheral area. Instead of useful color information, this peripheral area actually reflects the color of the substrate that is typically dark. The dark peripheral area decreases the contrast. It is necessary to enhance the image contrast of a gyricon display.
Using a reflective corona around each particle to enhance the image contrast of a gyricon display is proposed. A plurality of open cavities is provided in an elastomer layer. The periphery near the cavity openings is metallized, thereby forming reflective coronas. The cavities are filled with bichromal balls and a dielectric liquid and are covered at the top with an electrode substrate. An ambient light ray incident upon the display is reflected from a portion of the white hemisphere of a ball. The light ray is then reflected by the reflective corona surface and travels to the viewer. The light is reflected from a surface that is larger than the particle due to the reflective corona. Thus, the reflective corona around the particle creates the appearance of a surface area of a particle that is larger than the actual surface area of the particle. The peripheral area that lacks color information disappears, so the pixel brightness is increased. This enhances the image contrast.
Additional information
At certain incident angles of light, the reflective corona may be formed by using the principle of total internal reflection, when the reflecting surface represents an interface of two different materials, even if the interface is not made of a material highly reflective in the ordinary sense. Optical lenses may also be utilized to form enlarged images for each bichromal ball particle. In such an arrangement, light from the surface of the particle is projected onto the peripheral area through refraction instead of reflection. The reflective corona may be formed for twisting bichromal particles of various shapes (for example, cylindrical particles).
US Patent 6570700; Link >>
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