JPH01211735A - Electrophoresis display device - Google Patents

Abstract

PURPOSE:To prevent generation of display unevenness of an electrophoresis display device and to prolong a life of the device by extending thin wall parts to almost midway between spacers from both electrodes, moderating thus precipitation of electrophoretic particles. CONSTITUTION:Plural thin wall parts 16 are extended from electrodes 14, 15 to almost midway between the electrodes 14, 15, wherein the thin wall parts are arranged at the display electrode side 14 and another electrode side 15 alternately so as to moderate the precipitation of electrophoretic particles 12. In this case, the thin wall parts 16 are shaped to thin plates with an insulating material, for example, thin films of polyamide, etc., so as not to obstruct the display. Thus, generation of display unevenness is prevented by moderating the precipitation of velocity of electrophoretic particles, and the life of the display device is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an electrophoretic display device that utilizes electrophoresis.

[Prior Art] As an electrophoretic display device, a dispersion system is formed by dispersing a colored liquid dispersion medium, such as ink, and electrophoretic particles, which are also colored, in the dispersion medium. Electrodes are provided on both sides of this dispersed system, and display is performed by turning on and off a voltage. When the voltage is turned off, the color of the dispersion medium is displayed, and when the voltage is turned on, the color of the electrophoretic particles is displayed. These devices can be combined as necessary and used as a display device.

[Problems to be Solved by the Invention] However, electrophoretic particles are not evenly distributed in the dispersion medium, and when mold pressure is not applied for a long time, especially when the display device is stood vertically. The electrophoretic particles settle under the display device and condense, causing display unevenness and shortening the life of the display device.

In order to solve this problem, for example, Japanese Patent Application Laid-Open No. 59-171930
The publication discloses a technique (4, i) that divides the cells into small sections, but if it is divided into small sections, when injecting the dispersion system during manufacturing, it may be difficult to inject uniformly into the cells. be.

[Object of the present invention] The present invention is to reduce the settling of electrophoretic particles below a display device, thereby extending the life of the display device.

Structure of the present invention> [Means for solving the problem] In an electrophoretic display device obtained by sandwiching a dispersion system having a dispersion medium and electrophoretic particles between image electrodes and applying a voltage, several particles are alternately separated from the image electrode. This is an electrophoresis device having a thin wall section.

[Operations and Examples] FIG. 1 shows a cross-sectional view of the electrovibration display device M100.

The electric drive display device M100 includes a substrate 13.17 and spacers 18, 18' forming one housing. Inside the housing, a dispersion medium 11 such as a tetrachloride difluoroethane system colored with ink or paint, and electrophoretic particles 12 such as colored titanium oxide are contained. And electrophoretic particles 12
are dispersed in a dispersion medium 11 to form a dispersion system 10.

A voltage (2) is applied to the electrodes 14i5 across the dispersion system 10 to obtain the required display. However, the display appears on the left side of the electrophoretic display device 100. For this reason,
On the left side of the distributed IO, it is necessary not to interfere with the display, so the substrate 13 on the display side should be made of transparent glass or plastic, and the electrode 14 on the display side should also be made of a transparent material 81.
02 etc. is used.

The present invention provides a plurality of thin wall portions 16 alternately from the image electrodes of the electrodes 14 and 15 in order to moderate the sedimentation of the electrophoretic particles 12, thereby reducing the sedimentation speed of the electrophoretic particles and preventing display unevenness. This also extends the lifespan of the display device.

Thin wall portion 16 extends beyond electrode 14.15 and extends beyond electrode 14.15.
It extends to the middle of the interval. The thin wall portions 16 have several sides and are provided alternately from the display side electrodes 1 and 1 and the other electrode 15 in order to slow down the sedimentation of the electrophoretic particles 12.

Furthermore, FIG. 2 is a partial sectional view of the electrophoresis device. The thin wall 26 extends until it almost touches the electrode 14.15. The closer the thin wall portion 26 is to the opposite electrode, the more difficult it is for the electrophoretic particles 12 to settle.

Further, FIG. 3 is a partial sectional view when the dispersion system 10 is sandwiched between the electrodes 14 and 15. Even when the end of the thin wall section 36 is in contact with the electrode on the opposite side, when injecting the dispersion system IO containing the electrophoretic particles 12, the tip of the thin wall section 36 is bent and can be injected. When the injection is completed, the end of the thin wall portion 36 comes into contact with the electrode on the opposite side again, and the electrophoretic particles 12 are prevented from settling and aggregating.

Note that the thin wall portion 16 is made of a thin plate-shaped insulating material, such as a thin film of polyamide, etc., so as not to interfere with display.

Effects of the Present Invention> Since the thin wall portion is extended from the picture electrode to the middle of the spacer interval to alleviate sedimentation of electrophoretic particles, display unevenness is alleviated and visibility becomes easier. Furthermore, it has become possible to extend the life of the display device.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electrophoretic display device. 2 and 3 are partial cross-sectional views of the electrophoretic display device. 10... Dispersion system 11... Dispersion medium 12... Electrophoretic particles 14.15... Electrode 16.26.36... Thin wall Department Patent Applicant Kinseki Co., Ltd. Procedural Amendment (Sealed) December 2, 1985 Director General of the Japan Patent Office Kunio Ogawa Tanari 1 Indication of the case 1988 Patent Application No. 268992 2 Name of the invention Electrophoretic display device 3 , Person making the amendment Relationship in the case Patent applicant Postal code 201 Telephone number (03) 489-2311
Detailed description of the invention in the specification! ” ,,'H
52, 3-25・Supplementary contents −＼Me・(
1) Delete the colored ``Yo'' on the 2nd line of the 2nd page of the specification.
N, turn OFF ~ and y are corrected to read, ``When changing the display, a voltage is applied to draw the electrophoretic particles to the electrode on the display side to change the display.'' (3) "Electrophoretic device" on page 3, line 12 of the specification is corrected to read "electrophoretic display device." (4) "Electrophoretic device" on page 3, line 19 to 20 of the specification. Delete the colored YO. (5) "Si○2J" on page 4, line 9 of the specification.
Correct as S n O2J. (6) Delete ", aggregation" on page 5, line 12 of the specification.

Claims (3)

[Claims] (1) An electrophoretic display device obtained by sandwiching a dispersion system containing a dispersion medium and electrophoretic particles between two electrodes and applying a voltage, characterized in that a plurality of thin wall portions are alternately provided from both electrodes. electrophoretic display device. (2) The electrophoretic display device according to claim 1, wherein the tip of the thin wall portion is close to the opposing electrode. (3) The electrophoretic display device according to claim 1, wherein the thin wall portion extends until the tip thereof comes into contact with the opposing electrode.