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US 6,587,254 B2Granted
Image display medium
AssigneeFuji Xerox Co., Ltd.
InventorsTakeshi Matsunaga, Kiyoshi Shigehiro, Yoshiro Yamaguchi, Yoshinori Machida, Motohiko Sakamaki
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AssigneeFuji Xerox Co., Ltd.
InventorsTakeshi Matsunaga, Kiyoshi Shigehiro, Yoshiro Yamaguchi, Yoshinori Machida, Motohiko Sakamaki
Estimating the term…
An image display medium that can maintain stable display characteristics without dew condensing on a display substrate surface or on particles in almost all environments in which the image display medium is presumed to be used, even if there are changes in the environment external to the image display medium. In a closed gap formed between a display substrate having an electrode and a back substrate disposed opposite to the display substrate and having an electrode, plural kinds of particle groups differing in color and charge characteristics and movable between the substrates by an electric field are sealed. The gap is given a proper amount of water vapor so that dew does not condense within a predetermined temperature range. Thus, favorable and stable display characteristics can be obtained.
An image display medium comprising:
An image display medium comprising:
A method of forming an image display medium, the method comprising the steps of:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Being movable elements: the positions of the elements being controlled by the application of an electric field
Displaying
Term ended 31 Aug 2021 (estimated)
1. Field of the Invention
The present invention relates to an image display medium, and more particularly to a repeatedly rewritable image display medium using coloring particles.
2. Description of the Related Art
FIG. 1 is a schematic, cross-sectional explanatory diagram of an image display medium pertaining to an embodiment of the present invention;
FIG. 2 is a graph showing modes of change in charge amount of particle groups due to changes in outside air temperature and water vapor content;
FIG. 3 is a table showing display states of the image display medium when external environmental temperature and water vapor content in a gap between substrates are varied;
(First Embodiment)
Referring to the drawings, a first embodiment of the present invention will now be described in detail below.
As shown in FIG. 1, an image display medium 10 according to this embodiment comprises a transparent display substrate 12 disposed at the side of the image display medium at which an image is displayed, and a back substrate 14 which is a non-display substrate disposed opposite to the display substrate 12. The display substrate 12 and back substrate 14 are disposed, via a partition wall 16, with a predetermined gap 18 disposed between. The display substrate 12 and back substrate 14 are adhered and closed with an adhesive 20. In the present embodiment, the display substrate 12 is 7059 glass with a transparent electrode ITO 12A of 50×50×1.1 mm, and the back electrode 14 is a substrate having a copper electrode 14A evaporated on an epoxy resin of 50×50 mm. The partition wall 16 is formed by photolithographic technology, using an ethylene resin on the back electrode 14. The adhesive 20 is a two-pack kind epoxy resin deaerated for 15 to 30 minutes at degree of vacuum of 400 Torr or less.