Electrophoretic display device

By introducing some light-transmitting and light-reflecting particles into the electrophoretic medium and combining them with a specific driving method, the problem of insufficient display in four-particle electrophoretic media was solved, and the display of five colors was realized, especially black, white, red, green, blue and yellow, thus optimizing the display effect and color purity.

CN115668049BActive Publication Date: 2026-07-07E INK CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
E INK CORP
Filing Date
2021-06-04
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Four-particle electrophoretic media can only display four independent optical states, which is difficult to meet the display requirements of black, white and three primary colors (such as red, green and blue or blue, red and yellow) in applications such as electronic marking. Existing five-particle and six-particle electrophoretic media have complex waveforms and are difficult to control colors.

Method used

An electrophoretic medium containing white, partially translucent, and two types of non-white light-reflecting particles is used. Five colors are displayed through a specific driving method, and a fifth particle is added to display six colors. The display effect is optimized by using a combination of different polarities and electrophoretic mobility, combined with vibration and DC balance waveforms.

Benefits of technology

It achieves the display of five colors, including black, white, red, green, blue and yellow, and reduces color contamination by optimizing the waveform, thereby improving the display effect and color purity.

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Abstract

The electrophoretic medium comprises a fluid and particles of first, second, third and fourth types (W, Y, R, B) having four different colors. The first and third particles have one polarity of charge, while the second and fourth particles have the opposite polarity of charge; the first particles have a greater electrophoretic mobility or electrophoretic motility than the third particles, and the second particles have a greater electrophoretic mobility or electrophoretic motility than the fourth particles. One particle is white (W), one non-white particle (B) is partially light-transmissive, and the remaining two non-white particles (R, Y) are light-reflective. A third light-reflective particle (G) can be added to create a five-particle medium.
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