JPH0243571A - image display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image display device used for example as an output device of a computer, and particularly to one that displays a multicolor image.

(Prior Art) Conventionally, the following display devices have been proposed using a recording medium having a conductive film to which a conductive magnetic developer (toner) is attached. That is, as shown in FIG. 7, an endless belt-shaped recording medium 3 is wound and rotated between a pair of rollers 1 and 2, and the above-mentioned film is placed on the surface of the recording medium 3 at a position facing one of the rollers 2. An image forming means 4 for forming an image by applying a developer is provided. This image forming means 4 is, for example,
7, etc., a recording controller 6 applies a voltage corresponding to image information to a recording electrode 5 protruding toward a recording medium 3, and a developer supply device 7 applies a voltage corresponding to image information to the recording electrode 5. The toner supplied to the toner 8 adheres to the recording medium 3'' to form an image. The recording medium 3 on which the image has been formed in this manner is rotated to the display window 9 and the formed image is displayed, and then the toner adhering to the recording medium 3 is rubbed off by the cleaner 10 and the image is erased. , prepare for the next display again.

(Problem to be Solved by the Invention) In order to make the image formed in the above-mentioned conventional example multicolored, there are methods that use multiple color toners, methods that provide a striped multicolor filter layer on the recording medium, etc. Proposed. However, the method using toners of a plurality of colors has disadvantages in that image forming means for the colors used are required, making it impossible to downsize the apparatus, and that the toners mixed together after cleaning cannot be reused. Further, in the method of providing a striped multicolor filter layer, there is a problem in that it is difficult to control the drive of the recording medium.

The present invention has been made to solve the problems of the prior art described above, and its purpose is to provide an image display device that is small, easy to control, and capable of displaying multiple colors.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, an image is formed by electrostatically depositing a developer on a transparent recording medium via a recording electrode, In an image display device that visually displays an image on a display section, a heat-sensitive recording medium that reversibly changes between a transparent state and a cloudy state by heat is provided on the back side of the recording medium, and a heat-sensitive recording medium that changes reversibly between a transparent state and a cloudy state by heat is provided, and A colored plate is arranged, and a thermal recording head driven in accordance with the image information writes transparent image information on the heat-sensitive recording medium so that it can be displayed as a color image on the colored plate. It is characterized by being able to display images in a hurry.

(Function) When displaying a multi-color image, an electrostatic image visualized by a developer and a plurality of color images formed by a colored plate written on a heat-sensitive recording medium and passed through a transparent section are used. The image will be displayed.

(Embodiment) The present invention will be explained below based on the illustrated embodiment. In FIG. 1 showing an image display device according to an embodiment of the present invention, 3 is an endless belt-shaped recording medium, and a driving roller vs 1
．． 2 and rotates as the drive roller pair rotates. Image forming means 4 is provided near one drive roller 2 . The image forming means 4 includes an electrode 5 that applies a voltage corresponding to image information to the recording medium 3, and a developer supply device 7 that supplies conductive magnetic developer 8 to the electrode. The developer supply device 7 consists of a container 71 containing a conductive magnetic developer 8 and a rotating magnet 72 that rotates within the container 71. The conductive magnetic developer (hereinafter referred to as toner) is attracted to the rotating magnet 72, moves along the hills of the rotating magnet 72, and is supplied to the recording electrode 5. Application of voltage to the recording electrode 5 is performed by the recording control unit 6 in accordance with image information.

The recording medium 3 on which the image has been formed by the image forming means 4 is moved to the display section 9 and displayed. At the position of the display section 9, a colored plate 21 is present on the back side of the recording medium 3.
After the display has been completed, the recording medium 3 is further moved and the toner attached thereto is removed by the cleaner 10. The removed toner falls into the container 71 and is used again. The recording medium 3 from which the toner has been removed moves further and is heated by the thermal recording head 22 and cooled by the cooling device 23. Both the recording head 22 and the cooling device 23 are operated by applying a voltage corresponding to image information by the recording control section 6.

The recording medium 3 has the structure shown in FIG. That is, a transparent insulating film 31 such as polyethylene terephthalate (PET) is used as a base material, one side is thinly coated with a transparent conductive film 32 made of indium oxide, and the other side has a transparent state and a cloudy state reversible by heat. The recording medium 33 is coated with a thermosensitive recording medium 33 that changes in temperature, and is further laminated with a transparent insulating film 34 on both sides. The heat-sensitive recording medium 33 is usually in a cloudy state at room temperature when no recording is being performed, so it appears white. However, the temperature of the thermosensitive recording medium 33 is raised from room temperature T1 to T2, and TI
It becomes a transparent state when cooled to TI, and returns to a cloudy state when the temperature is raised again from T1 to T2 and then cooled to TI by a rapid cooling operation. Note that the temperature is TI <72.

Examples of substances exhibiting such properties include JP-A-61
There is a blend of vinylidene fluoride-hexafluoroacetone copolymer and low molecular weight methyl methacrylate shown in No.-258853. The side of the recording medium 3 coated with the thermal recording medium 33 faces the thermal recording head 22 .

The thermal recording head 22 extends approximately 0.3 mm in the axial direction of the drive roller 5.
(lsmX O, 30+am heating resistive elements are arranged in the axial direction over the entire width of the recording medium with a pitch interval of 0.36+sm, and the number of heating resistive elements is the same as the number of electrodes of the recording electrode 5. , each heating resistor element can repeatedly generate and extinguish heat individually in accordance with the image by the current from the recording control unit 6.The cooling device can be made of, for example, a metal with a large heat capacity and a high heat transfer coefficient. By bringing it into contact with and separating from the heat-sensitive recording medium, cooling can be performed or not.

A method for forming an image on the recording medium 3 will be described below with reference to FIGS. 1 and 3. To form an image on the side of the recording medium 3 coated with the transparent conductive film 32, an image is obtained using the toner 8 using a conventional technique (described above, so the explanation will be omitted). At this time, by using, for example, black conductive magnetic colored particles as the toner 8, a black and white image can be obtained.

To form an image on the side of the recording medium 3 coated with the heat-sensitive recording medium 33, first, a voltage corresponding to the image information is applied to the heat-recording electrode 22 from the recording control unit 6, and the heat-sensitive recording medium in a cloudy state is A transparent portion 33b can be obtained by applying heat (temperature T2) corresponding to the information to the portion 33 from the thermal recording head 22, and cooling that portion to TI after recording.

Therefore, an image is formed with a transparent portion and a cloudy portion 33a (a portion that is not heated). If you want to erase this image, use the thermal recording head 22 to erase the area.
2 and then rapidly cooled to T1 in the cooling device 23 to return to the original cloudy state. By installing a colored plate 21 colored, for example, red, on the back side of the recording medium 3 on which images in a transparent state and a cloudy state have been formed, the image visually recognized from the display *9 becomes an image in red and white. Therefore, the side coated with transparent conductive j 1 and 32 and the heat-sensitive recording medium 3
When images are simultaneously formed on the side coated with 3, an image formed in 3 colors of white, black, and red can be obtained.

(Other Embodiments) FIG. 4 is an explanatory diagram showing the main structure of an image display device according to another embodiment of the present invention. In this example, 2
A set of recording media 3.41 and two drive roller pairs 1, 2, 4
2.43 is provided. That is, the first drive roller pair 1
．． With respect to the first recording medium 3 which is wound and rotates around 2,
Inside this first recording medium 3, there is another drive roller pair 42.
There is a second recording medium 41 that is wound around a rotating shaft 43 and rotates. The first recording medium is the same as recording medium 3 (FIG. 2) of the above embodiment, but the second recording medium does not have a conductive film to which toner is attached, and instead has a colored insulating film. It is provided. Further, a deflection roller 44 is provided to form a space for the second recording medium 41 in which the thermal recording head 22 and the cooling device 23 are provided.

The second recording medium 41 has the configuration shown in FIG. That is, the thermosensitive recording material uses a colored insulating film 45 made of a material such as polyethylene terephthalate (PET) colored with a highly transparent dye as a base material, and whose surface changes reversibly between a transparent state and a cloudy state by heat. coating the medium 46;
Furthermore, it is laminated with a transparent insulating film 47.

Next, in FIG. 6, the operation of this embodiment will be explained. Both the first and second recording media 3, 41 are in a cloudy state 33a, 46a, and an image containing only toner 8 (for example, black) Now you can display in black and white. Moreover, if the base material 45 of the recording medium 41 is made magenta, the transparent state 33 will be applied to the heat-sensitive recording medium 33 of the first recording medium 3.
b. By forming an image in a cloudy state 33a, a display consisting of white and magenta can be produced. Furthermore, if the colored plate 2 is cyan-colored, the heat-sensitive recording medium 33 of the first recording medium 3 is kept in a transparent state 33b, and furthermore, the heat-sensitive recording medium 46 of the second recording medium 41 is kept in a transparent state. 46b and a cloudy state 46a, a display consisting of magenta and blue is possible.

Formation of toner image on recording medium 3 and recording medium 3.41
The method of forming images in a transparent state and a cloudy state is the same as that shown in the previous embodiment.According to this embodiment,
By forming images on each of the recording media 3.41, display can be performed in four colors: white, black, magenta, and blue.

(Effects of the Invention) According to the image display device of the present invention, there is no need for a plurality of image forming means, the developer can be reused after cleaning, and there is no need to provide a striped multicolor filter layer. This prevents drive control from becoming difficult.
Therefore, it is possible to obtain an image display device that can be miniaturized, easily controlled, and capable of displaying multiple colors.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main structure of an embodiment of the image display device of the present invention, FIG. 2 is a cross-sectional configuration diagram of the recording medium of FIG. 1,
Figure 3 is a cross-sectional view of the recording medium after image formation in Figure 1;
The figure is an explanatory diagram of the main structure of another embodiment of the image display device of the present invention, FIG. 5 is a cross-sectional configuration diagram of the recording medium used in FIG. 4, and FIG. 6 is after the image formation in FIG. FIG. 7 is an explanatory diagram of the main structure of a conventional image display device. Explanation of symbols 1.2... Drive roller 3... Endless belt-shaped recording medium 4... Image forming means 5... Recording electrode 6...
Recording control section 8... Conductive magnetic toner 9... Display section 10... Cleaner 21.
... Colored plate 22 ... Thermal recording head 23 ...
・Cooling device 31...Transparent insulating film base material 32...Transparent conductive film 33...Thermosensitive recording medium 4...Transparent insulating film...Endless belt recording medium 2.43... Drive roller 4...Deflection roller 5...Colored insulating film base material 6...Thermosensitive recording medium Fig. 1 Fig. 4 Fig.

Claims (1)

[Scope of Claims] An image display device that forms an image by electrostatically depositing a developer on a transparent recording medium via a recording electrode, and displays the image visually on a display section, comprising: A thermosensitive recording medium that reversibly changes between a transparent state and a cloudy state by heat is provided on the back side of the medium, and a colored plate is placed behind the thermosensitive recording medium, and a thermal recording head that is driven in accordance with image information is used. An image display device characterized in that transparent image information is written on a heat-sensitive recording medium so that it can be displayed as a color image on a colored plate, and a plurality of color images can be displayed together with the image of the developer.