Electrophoretic display element with filler particles
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G09G-003/34
출원번호
US-0308326
(2006-03-16)
등록번호
US-8115729
(2012-02-14)
발명자
/ 주소
Danner, Guy M.
Amundson, Karl R.
Herb, Craig
Zhang, Libing
출원인 / 주소
E Ink Corporation
대리인 / 주소
Cole, David J.
인용정보
피인용 횟수 :
74인용 특허 :
375
초록▼
The invention relates to methods and materials for controlling stability and color intensity in an electrophoretic display element. Filler particles in the electrophoretic display element, serves as a medium that the electrophoretic particles must travel through during switching between optical stat
The invention relates to methods and materials for controlling stability and color intensity in an electrophoretic display element. Filler particles in the electrophoretic display element, serves as a medium that the electrophoretic particles must travel through during switching between optical states of the display. The filler particles provide improved control over the color intensity of the electrophoretic display element. In addition, the filler particles create resistance to the migration of the electrophoretic particles, thereby improving the bistability of the electrophoretic displays and inhibiting settling of the electrophoretic particles. Also, migration resistance provided by the filler particles can enable threshold addressing of an electrophoretic display.
대표청구항▼
1. An electrophoretic display element, the display element having a viewing surface and comprising at least one droplet of an electrophoretic phase and a wall surrounding the droplet, the droplet comprising: a fluid;a plurality of first particles disposed in the fluid and having a first optical char
1. An electrophoretic display element, the display element having a viewing surface and comprising at least one droplet of an electrophoretic phase and a wall surrounding the droplet, the droplet comprising: a fluid;a plurality of first particles disposed in the fluid and having a first optical characteristic and a first electrophoretic mobility;a plurality of second particles disposed in the fluid and having a second optical characteristic different from the first optical characteristic and a second electrophoretic mobility of opposite polarity to the first electrophoretic mobility; anda plurality of third particles disposed in the fluid and having a third optical characteristic different from the first and second optical characteristics, the third particles not undergoing electrophoretic motion in an electric field,the electrophoretic display element having a first display state in which the viewing surface displays the first optical characteristic, a second display state in which the viewing surface displays the second optical characteristic, and a third display state in which the viewing surface displays the third optical characteristic. 2. An electrophoretic display element according to claim 1 wherein the first, second and third optical characteristics comprise three different colors visible to the human eye. 3. An electrophoretic display element according to claim 2 wherein the three colors comprise red, green and blue. 4. An electrophoretic display element according to claim 2 wherein the three colors comprise yellow cyan and magenta. 5. An electrophoretic display element according to claim 2 wherein two of the three colors comprise black and white. 6. An electrophoretic display element according to claim 1 wherein the third particles are substantially spherical. 7. An electrophoretic display element according to claim 1 wherein the third particles are formed from silica, a metal or a polymer. 8. An electrophoretic display element according to claim 1 wherein the third particles occupy at least about 25 percent by volume of the droplet. 9. An electrophoretic display element according to claim 1 wherein the third particles occupy at least about 35 percent by volume of the droplet. 10. An electrophoretic display element according to claim 1 wherein the fluid is gaseous. 11. A method of driving an electrophoretic display element, the display element having a viewing surface and comprising at least one droplet of an electrophoretic phase and a wall surrounding the droplet, the droplet comprising a fluid;a plurality of first particles disposed in the fluid and having a first optical characteristic and a first electrophoretic mobility;a plurality of second particles disposed in the fluid and having a second optical characteristic different from the first optical characteristic and a second electrophoretic mobility of opposite polarity to the first electrophoretic mobility; anda plurality of third particles disposed in the fluid and having a third optical characteristic different from the first and second optical characteristics, the third particles not undergoing electrophoretic motion in an electric field,the method comprising:applying an electric field of one polarity to the droplet, thereby causing the first particles to approach the viewing surface and the second particles to become spaced from the viewing surface, so that the viewing surface displays the first optical characteristic;applying an electric field of the opposite polarity to the droplet, thereby causing the second particles to approach the viewing surface and the first particles to become spaced from the viewing surface, so that the viewing surface displays the second optical characteristic; andapplying to the droplet an electric field of such polarity and duration that both the first and second particles are hidden by the third particles, so that the viewing surface displays the third optical characteristic. 12. An electrophoretic display comprising a plurality of electrophoretic display elements according to claim 1 and electrode means for applying electric fields to each display element. 13. An electrophoretic display element, the display element comprising at least one droplet of an electrophoretic phase and a wall surrounding the droplet, the droplet comprising: a fluid;a plurality of first particles disposed in the fluid and having an optical characteristic and an electrophoretic mobility; anda plurality of second particles disposed in the fluid and forming a filler therein through which the first particles can move, the second particles not undergoing electrophoretic motion in an electric field,wherein in the absence of an electric field, the first particles are attracted to the second particles. 14. An electrophoretic display element according to claim 13 further comprising a plurality of third particles having a second optical characteristic different from the first optical characteristic and an electrophoretic mobility of opposite polarity to the electrophoretic mobility of the first particles. 15. An electrophoretic display element according to claim 13 wherein the fluid is colored. 16. An electrophoretic display element according to claim 13 wherein the fluid is gaseous. 17. An electrophoretic display element according to claim 13 wherein the second particles are substantially spherical. 18. An electrophoretic display element according to claim 13 wherein the second particles are formed from silica, a metal or a polymer. 19. An electrophoretic display element according to claim 13 wherein the second particles occupy at least about 25 percent by volume of the droplet. 20. An electrophoretic display element according to claim 19 wherein the second particles occupy at least about 35 percent by volume of the droplet. 21. An electrophoretic display comprising a plurality of electrophoretic display elements according to claim 13 and electrode means for applying electric fields to each display element. 22. An electrophoretic medium comprising a fluid; a plurality of a first type of particle having a first optical characteristic and a charge of one polarity; and a plurality of a second type of particle having a second optical characteristic different from the first optical characteristic and a charge of the opposite polarity, the first and second types of particles being dispersed in the fluid, the electrophoretic medium displaying essentially zero conductivity on application of an electric field below a threshold, and a non-zero conductivity on application of an electric field above the threshold. 23. An electrophoretic medium according to claim 22 wherein the first and second types of particles bear polymer coatings. 24. A method of varying the optical state of an electrophoretic medium, the medium comprising a fluid; a plurality of a first type of particle having a first optical characteristic and a charge of one polarity; and a plurality of a second type of particle having a second optical characteristic different from the first optical characteristic and a charge of the opposite polarity, the first and second types of particles being dispersed in the fluid, the electrophoretic medium exhibiting a non-linear response to an applied electric field, the method comprising applying to the electrophoretic medium in an initial optical state a first drive pulse having a first voltage and a first duration and thereafter applying to the electrophoretic medium a second drive pulse having a second voltage and a second duration such that the algebraic sum of the impulses applied by the two drive pulses is zero, thereby driving the electrophoretic to a final optical state different from the initial optical state.
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이 특허에 인용된 특허 (375)
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