 Polyolefin composition containing optical brighteners having reduced migration |
| We claim: 1. A composition of matter comprising an inclusion compound of an optical brightener and ... |
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| Dispersion aids for optical brighteners in polyolefins |
| OF THE INVENTION Although it is known that the addition of optical brightener into a non-polar ... |
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| Transparent/translucent bottles |
| OF THE INVENTION Fluorescent Dyes Classes of fluorescent dyes which may be used include stilbenes; ... |
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| Crosslinked sulfonated polyimide films |
| OF THE INVENTION The present invention provides a sufonated polyimide comprising the repeating ... |
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| Resin denture base molding apparatus |
| In view of the aforementioned problems, it is an object of the present invention to provide an ... |
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| Dental material |
| OF PREFERRED EMBODIMENTS The foregoing object is achieved by impregnating communicating holes of a ... |
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| Dental mouthpiece and method of making same |
| OF PREFERRED EMBODIMENTS Referring to FIG. 1, there is seen an arch-shaped mouthpiece substrate 10.... |
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| Method for manufacturing a dental prosthesis |
| It is the object of the present invention to provide an improved method for manufacturing fiber ... |
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| Nozzle contact device of an injection machine |
| The present invention provides a nozzle contact device of an injection machine. The nozzle contact ... |
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| Process for providing a decorative transfer in a molded product |
| In a first aspect, the present invention pertains to a decorative transfer including a backing and ... |
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Electrophoretic device and method of manufacturing it
| Details |
Inventors: Kawai, Hideyuki;
Assignee: Seiko Epson Corporation (JP)
Primary Examiner: Sugarman; Scott J.
Assistant Examiner: Hanig; Richard
Attorney, Agent or Firm: Harness, Dickey & Pierce, P.L.C.
An electrophoretic device is composed of a pair of electrodes that are arranged opposite to each other with a prescribed space therebetween, which contains an electrophoretic dispersion liquid containing electrophoretic particles which are dispersed in a liquid phase dispersion medium. At least one ferroelectric substance layer is arranged at a prescribed position within the space between the electrodes, and at least one of the electrodes is made of a transparent material. Applying a drive voltage between the electrodes, the electrophoretic particles are deposited on one electrode while ions of reverse polarity move towards another electrode, thus establishing the polarized state of the electrophoretic dispersion liquid, which is maintained for a long time due to the residual polarization characteristics of the ferroelectric substance layer. |
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DETAILED DESCRIPTION It is an object of the invention to provide an electrophoretic device that has remarkably improved display characteristics for retaining images on the screen when producing an electronic paper.
It is another object of the invention to provide a method for manufacturing the electrophoretic display with simple processes and practically without limitations in selecting the materials for use in the manufacture.
This invention provides unique and easy-to-manufacture structures for electrophoretic devices such as electrophoretic displays, in which an electrophoretic dispersion liquid containing electrophoretic particles dispersed in the liquid phase dispersion medium is contained in a space between electrodes, at least one of which is composed of transparent materials.
This invention is characterized by arranging ferroelectric substance layers between the electrodes, which are arranged opposite to each other.
The provision of the ferroelectric substance layers, which are arranged between the electrodes, allows the polarized state of the electrophoretic dispersion liquid to be maintained for a long time.
Thus, it is possible to improve the image retaining capability of the electrophoretic device.
In the first aspect of the invention, the ferroelectric substance layers are connected in series within the space formed between the electrodes.
Therefore, it is possible to enlarge the overall effective area of the ferroelectric substance layers, which makes it effectively maintain the polarized state of the electrophoretic dispersion liquid.
In addition, it is possible to simplify the structure of the electrophoretic device, which can be manufactured with ease.
In the second aspect of the invention, ferroelectric substance layers are arranged in parallel between the electrodes.
In this case, it is possible to reduce the drive voltage applied between the electrodes because of the parallel arrangement of the ferroelectric substance layers between the electrodes.
In the third aspect of the invention, there is further provided a switch enabling repetitive and reversible switching between the electrophoretic dispersion liquid and the ferroelectric substance layers to be electrically connected in series or in parallel
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Nonmetallic Processes 
