Method for driving electrophoretic display device

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United States of America Patent

PATENT NO 12094429
APP PUB NO 20240021168A1
SERIAL NO

18475643

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Abstract

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An electrophoretic medium comprises a fluid and first (B), second (Y), third (R) and fourth (W) particles dispersed in the fluid and having differing colors. The first (B) and third (R) particles bear charges of one polarity and the second (Y) and fourth (W) particles bear charges of the opposite polarity, The first particles (B) have a greater zeta potential than the third particles (R), and the second particles (Y) have a greater zeta potential than the fourth particles (W). One of the particles (W) is white, one of the non-white particles (B) is partially light-transmissive, and the remaining two non-white particles are light-reflective. To display the color of a mixture of the first (B) and second (Y) particles at a viewing surface, the medium is driven to display the second particles (Y) at the viewing surface, then a first driving voltage is applied for a first period to drive the second (Y) and fourth (W) particles towards the viewing surface, then a second driving voltage, of opposite polarity to and lower magnitude than, the first voltage, is applied for a second period less than the first period, and finally the applications of the two driving voltages are repeated.

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Patent Owner(s)

Patent OwnerAddress
E INK CORPORATION1000 TECHNOLOGY PARK DRIVE BILLERICA MA 01821-4165

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lin, Craig Fremont, US 148 5710
Zheng, Xiaolong Fremont, US 27 107

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