Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2000-05-03
2004-02-17
Shankar, Vijay (Department: 2673)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S084000, C345S085000
Reexamination Certificate
active
06693620
ABSTRACT:
TECHNICAL FIELD
The invention provides methods of threshold addressing of electrophoretic displays. More particularly, the invention relates to materials and methods for providing a particle-filled capsule in which the capsules are addressed with two voltages or, alternatively, at a threshold.
BACKGROUND OF THE INVENTION
In an electrophoretic display (encapsulated or not), the particles contained within the display move by being driven according to an applied electric field. This movement produces a display state with the particles in one location and a display state with particles in a second location. However, in a conventional electrophoretic display, each pixel must be addressed individually to cause the display to operate. The provision of address lines that address individual pixels at predetermined locations in a display can be quite complex and expensive. In color displays, the necessity to address number of color elements per pixel increases the complexity and expense of manufacture of such displays.
The bistable nature of electrophoretic displays is another beneficial feature of these displays as compared to many other types of displays. Electrophoretic displays can retain their state for some period of time without the active application of power or of a driving signal, as compared to many other types of active displays such as cathode ray tubes, LEDs, LCDs and the like, which lose their display as soon as either (or both) of power or a driving signal is removed. Thermal or gravitational forces ultimately can degrade the display state of an electrophoretic display by inducing undesired motion in the particles that comprise such a display. Electrophoretic displays in general can benefit from an increased duration of a stable display state.
SUMMARY
The present invention relates to methods and materials for an electrophoretic display such that the particle motion is a controlled, non-linear function of the applied electric field. More particularly, the techniques and materials of the invention prevent, or at least significantly impede, the motion of charged pigment particles in the display under one set of conditions, while allowing them to move relatively freely under a second set of conditions. The invention enables, for example, passive addressing of the display and can eliminate gravitational or diffusional motion of the pigment particles over time, thus enhancing the bistable nature of the display.
Thus, threshold addressing allows simple, inexpensive passive addressing techniques to be employed. The inverse electrorheological gating techniques allow the construction of a full color, passively addressed display without the need to address individual capsules. This allows a mixture of capsules to be coated randomly onto a substrate, again enabling the creation of inexpensive displays. All the techniques described allow a significant threshold to be realized, which allows rapid movement of the pigment particles above the threshold, which in turn allows rapid switching times for the display. The use of grafted molecules to provide steric stability to the pigment and floc network particles combined with controlled strength ion pairs instead of physically adsorbed dispersants and charging agents, allows improved control over the conductivity of the display medium in both encapsulated and traditional electrophoretic displays. Since diffusion and gravity are extremely weak forces compared to the yield stresses created, the structured or gelled medium approach also provides a great improvement in the bistability of the displays.
REFERENCES:
patent: 2800457 (1957-07-01), Green et al.
patent: 3036388 (1962-05-01), Tate
patent: 3384488 (1968-05-01), Tulagin et al.
patent: 3406363 (1968-10-01), Tate
patent: 3460248 (1969-08-01), Tate
patent: 3585381 (1971-06-01), Hodson et al.
patent: 3612758 (1971-10-01), Evans et al.
patent: 3668106 (1972-06-01), Ota
patent: 3670323 (1972-06-01), Sobel et al.
patent: 3756693 (1973-09-01), Ota
patent: 3767392 (1973-10-01), Ota
patent: 3772013 (1973-11-01), Wells
patent: 3792308 (1974-02-01), Ota
patent: 3806893 (1974-04-01), Ohnishi et al.
patent: 3850627 (1974-11-01), Wells et al.
patent: 3870517 (1975-03-01), Ota et al.
patent: 3892568 (1975-07-01), Ota
patent: 3909116 (1975-09-01), Kohashi
patent: 3922255 (1975-11-01), Koestler et al.
patent: 4001140 (1977-01-01), Foris et al.
patent: 4041481 (1977-08-01), Sato
patent: 4045327 (1977-08-01), Noma et al.
patent: 4062009 (1977-12-01), Raverdy et al.
patent: 4068927 (1978-01-01), White
patent: 4071430 (1978-01-01), Liebert
patent: 4087376 (1978-05-01), Foris et al.
patent: 4088395 (1978-05-01), Giglia
patent: 4093534 (1978-06-01), Carter et al.
patent: 4104520 (1978-08-01), Lewis et al.
patent: 4123346 (1978-10-01), Ploix
patent: 4126528 (1978-11-01), Chiang
patent: 4126854 (1978-11-01), Sheridon
patent: 4143103 (1979-03-01), Sheridon
patent: 4143472 (1979-03-01), Murata et al.
patent: 4147932 (1979-04-01), Lewis
patent: 4149149 (1979-04-01), Miki et al.
patent: 4166800 (1979-09-01), Fong
patent: 4196437 (1980-04-01), Hertz
patent: 4201691 (1980-05-01), Asher et al.
patent: 4203106 (1980-05-01), Dalisa et al.
patent: 4211668 (1980-07-01), Tate
patent: 4218302 (1980-08-01), Dalisa et al.
patent: 4231641 (1980-11-01), Randin
patent: 4261653 (1981-04-01), Goodrich
patent: 4272596 (1981-06-01), Harbour et al.
patent: 4273672 (1981-06-01), Vassiliades
patent: 4285801 (1981-08-01), Chiang
patent: 4287337 (1981-09-01), Guglielmetti et al.
patent: 4298448 (1981-11-01), Müller et al.
patent: 4305807 (1981-12-01), Somlyody
patent: 4311361 (1982-01-01), Somlyody
patent: 4314013 (1982-02-01), Chang
patent: 4324456 (1982-04-01), Dalissa
patent: 4368952 (1983-01-01), Murata et al.
patent: 4390403 (1983-06-01), Batchelder
patent: 4418346 (1983-11-01), Batchelder
patent: 4419383 (1983-12-01), Lee
patent: 4438160 (1984-03-01), Ishikawa et al.
patent: 4439507 (1984-03-01), Pan et al.
patent: 4444961 (1984-04-01), Timm
patent: 4450440 (1984-05-01), White
patent: 4502934 (1985-03-01), Gazard et al.
patent: 4522472 (1985-06-01), Liebert et al.
patent: 4543306 (1985-09-01), Dubois et al.
patent: 4605284 (1986-08-01), Fergason
patent: 4620916 (1986-11-01), Zwemer et al.
patent: 4623706 (1986-11-01), Timm et al.
patent: 4643528 (1987-02-01), Bell, Jr.
patent: 4648956 (1987-03-01), Marshall et al.
patent: 4655897 (1987-04-01), DiSanto et al.
patent: 4666673 (1987-05-01), Timm
patent: 4707080 (1987-11-01), Fergason
patent: 4732830 (1988-03-01), DiSanto et al.
patent: 4742345 (1988-05-01), DiSanto et al.
patent: 4746917 (1988-05-01), DiSanto et al.
patent: 4748366 (1988-05-01), Taylor
patent: 4833464 (1989-05-01), DiSanto et al.
patent: 4889603 (1989-12-01), DiSanto et al.
patent: 4891245 (1990-01-01), Micale
patent: 4909959 (1990-03-01), Lemaire et al.
patent: 4919521 (1990-04-01), Tada et al.
patent: 4931019 (1990-06-01), Park
patent: 4947219 (1990-08-01), Boehm
patent: 5009490 (1991-04-01), Kouno et al.
patent: 5017225 (1991-05-01), Nakanishi et al.
patent: 5041824 (1991-08-01), DiSanto et al.
patent: 5053763 (1991-10-01), DiSanto et al.
patent: 5057363 (1991-10-01), Nakanishi
patent: 5059694 (1991-10-01), Delabouglise et al.
patent: 5066105 (1991-11-01), Yoshimoto et al.
patent: 5066559 (1991-11-01), Elmasry et al.
patent: 5066946 (1991-11-01), DiSanto et al.
patent: 5070326 (1991-12-01), Yoshimoto et al.
patent: 5077157 (1991-12-01), DiSanto et al.
patent: 5082351 (1992-01-01), Fergason
patent: 5099256 (1992-03-01), Anderson
patent: 5105185 (1992-04-01), Nakanowatari et al.
patent: 5128226 (1992-07-01), Hung
patent: 5128785 (1992-07-01), Yoshimoto et al.
patent: 5132049 (1992-07-01), Garreau et al.
patent: 5138472 (1992-08-01), Jones et al.
patent: 5149826 (1992-09-01), Delabouglise et al.
patent: 5151032 (1992-09-01), Igawa
patent: 5174882 (1992-12-01), DiSanto et al.
patent: 5177476 (1993-01-01), DiSanto et al.
patent: 5185226 (1993-02-01), Grosso et al.
patent: 5187609 (1993-02-01), DiSanto et al.
patent: 5204424 (1993-04-01), Roncali et al.
patent: 5216416 (1993-06-01), DiSanto et al.
patent: 5216530 (
Herb Craig A.
Loxley Andrew L.
Morrison Ian D.
Dharia Prabodh M.
E Ink Corporation
Shankar Vijay
Testa Hurwitz & Thibeault LLP
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