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colored electronic papre

E-paper is a display technology designed to mimic the character of paper. Such EPD displays are very thin, flexible, lightweight and can be viewed in bright ambient light. They are also procedurally very power efficient because the display is bistable and current only flows when changes occur. Previous EPD displays only allowed black and white representations. With more recent developments, color displays are also possible.

Color e-paper displays have the same characteristic properties as black-and-white EPD displays. They can use the same electrophoresis-based technology, such as the ACeP display, or alternatively use color filters.

Color e-paper technologies with color beads and color filters

Color e-paper technologies with color beads and color filters

Color e-paper displays consist of many small liquid-filled microcapsules containing microscopic, electrically charged color beads that can be moved by electric fields. Since e-paper is a reflective technology that uses subtractive color mixing, the color beads are in the colorscyan, magenta, yellow( CMY). The microcapsules always contain color beads of one color and black beads. In principle, the color beads and the black beads in the microcapsules are controlled by electric fields in such a way that either the color beads appear on the surface or the black pigments. If the color pigments are on the surface, then the viewer recognizes the color, otherwise the area is dark.

Color e-paper from E-Ink

Color e-paper from E-Ink

As an alternative to the described technique, other EPD color displays work with color filters. In this technique, the EPD display works with black and white display with prefixed color filters for red, green, blue( RGB). Since the color filters greatly reduce reflectivity, the displays are relatively dark.

Modifications of the two techniques can be found in various other processes.

Informations:
Englisch: colored electronic papre
Updated at: 07.12.2016
#Words: 274
Links: display, electronic paper display (EPD), light, power (P), current
Translations: DE
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