Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Reexamination Certificate
2000-07-21
2001-12-25
Pendegrass, Joan (Department: 2852)
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
C345S107000, C359S296000, C347S153000
Reexamination Certificate
active
06333754
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a method for displaying an image, an image displaying apparatus and an image displaying medium, and more particularly, it relates to a method for displaying an image, an image displaying apparatus and an image displaying medium, by which an image can be repeatedly displayed.
BACKGROUND OF THE INVENTION
As an electronic paper technology, those utilizing various techniques have been known, such as rotation of particles, electrophoresis, thermal rewritable, liquid crystal and electrochromy. As an example of the electronic paper technologies, a display technique using a toner shown in
FIG. 14
has been known, in which an electrode
82
and a charge transporting layer
84
are accumulated on each of facing surfaces of two glass substrates
80
a
and
80
b
facing each other, and an conductive colored toner
90
and white particles
92
are filled between the two substrates
80
a
and
80
b.
The electronic paper has such a constitution that a voltage corresponding to image data is applied to the electrode
82
to form an electric field on a part of the electrode
82
, so as to inject electric charge to the conductive colored toner
90
through the charge transporting layer of the non-display substrate
80
b,
whereby the conductive colored toner having electronic charge injected thereto is moved toward the display substrate
80
a
and attached thereto, so as to display an image by forming contrast of the colors of the conductive colored toner and the white particles.
However, in the electronic paper having the foregoing constitution, the process for forming the electrode and the charge transporting layer accumulated on the glass substrate is complicated and requires difficult skills, and therefore it causes a problem in that when the area of the substrate is increased, it becomes more difficult to produce products having constant performance.
Furthermore, the image displayed itself is unclear due to low contrast, and has a problem in that the viewing angle is small. Because the stability of the particles retained between the substrates is gradually deteriorated upon repeated use, it causes a problem of short service life as electronic paper.
SUMMARY OF THE INVENTION
In view of the foregoing circumstances, the invention has been made to provide a method for displaying an image, an image displaying apparatus and an image displaying medium that can provide an image of a high contrast and a large viewing angle. The invention has been also made to provide a method for displaying an image, an image displaying apparatus and an image displaying medium that can provide high stability of the particles upon repeated use.
The invention relates to, as a first aspect, a method for displaying an image containing a step of moving a display medium containing two display substrates, at least of which contains a charge transporting material, having therebetween at least one cell having at least two kinds of particles having different colors and different characteristics filled therein, relative to a head for applying an electric field that is provided on a side of one substrate of the two display substrates, so as to form an electric field on a region corresponding to image data in the display medium, whereby at least one kind of particles of the at least two kinds of particles are moved to a side of at least one of the substrates, so as to display an image.
REFERENCES:
patent: 3689400 (1972-09-01), Ota et al.
patent: 6045955 (2000-04-01), Vincent
patent: 62-269124 (1987-11-01), None
patent: 11-119704 (1999-04-01), None
Jo et al. “New Toner Display Device (I)—Image Display Using Conductive Toner and Charge Transport Layer-”, Japan Hardcopy '99 Fall Meeting Proceedings, 1999, pp. 249-252.
Jo et al., “New Toner Display Device (II)”, Japan Hardcopy '99 Fall Meeting Proceedings, 1999, pp. 10-13.
Kitamura et al., “Toner Display by Electrical Movement of Conductive Toner”, The Institute of Image Information and Television Engineers, Technical Report vol. 24, No. 16, 2000, pp. 7-11.
Kawai, “Development of Microcapsule -type Electrophoretic Display (MC-EPD)”, Japan Hardcopy '99 Proceedings, 1999, pp. 237-240.
Kakinuma Takeo
Koshimizu Minoru
Machida Yoshinori
Nakayama Nobuyuki
Oba Shota
Fuji 'Xerox Co., Ltd.
Oliff & Berridg,e PLC
Pendegrass Joan
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