JPH06148827A - Display device and display method - Google Patents

Abstract

PURPOSE:To inexpensively obtain a bright and dark image having excellent visibility by irradiating a thermosensitive recording medium which is changed in transparency to an image form by a printer with light from a photoirradiation device and projecting the image to this thermosensitive recording medium. CONSTITUTION:The thermosensitive recording medium 6 consisting of a reversible thermosensitive recording layer 3 formed on one surface of a transparent base 4, a protective layer 2 and a light scattering layer 5 formed on the other surface circumrotates along a roller 10 formed endless in an arrow direction. The image varying in the transparency is formed by a thermal means of a thermosensitive head 7-1 via the protective layer on the reversible thermosensitive recording layer constituting the thermosensitive recording medium 6 held by the printer 7 and a platen roll 11 at this time. A large quantity of the light transmits transparent parts 8 and a small quantity of the light transmits opaque parts 9 if this image is irradiated with the light from the photoirradiation device 1 which uniformalizes the light quantity of a halogen lamp 1-1 by a reflection mirror 1-2. The transmitted light transmitting through the thermosensitive recording medium layer by the light scattering layer 5 is decreased in the light quantity over the entire part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and a display method using a thermosensitive recording medium capable of reversibly recording and erasing an image by heating.

[0002]

2. Description of the Related Art Conventionally, as a display device, a CRT (CATHODE-
RAY TUBE), liquid crystal display devices, plasma display devices, etc. are used. CRTs are used in many fields because they can produce bright screens and color moving images, but they have the drawbacks that it is difficult to make large screen devices and that the devices themselves consume large amounts of power. is doing. Liquid crystal display devices have many advantages such as mobile TVs, personal computers, and various measuring devices because they have the excellent feature that they can make color movies with extremely low power and are small in size. However, it has a drawback that visibility is greatly different depending on the angle. Although plasma display devices are also used for many displays, they still have the problems that it is difficult to make a large screen and that visibility is poor.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, to produce a large-screen image at low cost, and to provide a display device excellent in visibility. It provides a display method.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a heat-sensitive material comprising a reversible thermosensitive recording layer whose transparency can be reversibly changed with temperature and a light-transmissive and light-scattering light-scattering layer. A recording medium, a printing device provided with a heating unit capable of changing transparency in an image-like manner, and a light irradiation device are arranged on the side of the reversible thermosensitive recording layer constituting the thermosensitive recording medium. And a display device.

Further, the present invention provides a heat-sensitive recording medium comprising a reversible heat-sensitive recording layer whose transparency can be reversibly changed with temperature and a light-transmitting and light-scattering light-scattering layer.
An image is formed or erased by a printing device having a heating means, and the image is irradiated with light from a light irradiation device from the side of the reversible thermosensitive recording layer constituting the thermosensitive recording medium,
It relates to a display method characterized in that an image is visually recognized from the other surface of the irradiation surface.

The details of the display device and the display method of the present invention will be described below with reference to FIG.

FIG. 1 shows an example of the arrangement of each device in the display device of the present invention. First, the thermosensitive recording medium 6 including the reversible thermosensitive recording layer 3 and the protective layer 2 formed on one surface of the transparent support 4 and the light scattering layer 5 formed on the other surface is formed endlessly, and the roller 10 is formed. Orbit in the direction of the arrow. At that time, the transparency of the reversible thermosensitive recording layer constituting the thermosensitive recording medium 6 sandwiched between the printing device 7 and the platen roll 11 is increased by the thermal means of the thermosensitive head 7-1 via the protective layer. Different images are formed. Next, when the image is irradiated with light from the light irradiation device 1 for making the light quantity of the halogen lamp 1-1 uniform by the reflecting mirror 1-2, a large amount of light is emitted in the transparent portion 8 and a small amount of light is emitted in the opaque portion 9. Light will be transmitted.

The amount of light transmitted through the heat-sensitive recording medium layer in the light-scattering layer 5 is further reduced, and as a result, the transparent portion 8 of the heat-sensitive recording medium 6 is bright for the viewer 12. , The opaque portion 9 can see a dark and light image excellent in visibility. Further, when the formed image is erased, the image is erased by the thermal means of the heat roller 7-2.

In the present invention, in order to clarify the visible image on the heat-sensitive recording medium, and to enlarge or reduce the recording on the heat-sensitive recording medium and project it on the display body, the light irradiation device 1 and the heat-sensitive device are used. A lens can be arranged at least at any position between the recording medium 6 and the thermal recording medium 6 and the viewer 12.

In the display device of the present invention, in order to display image information, the thermal recording medium is fixed and the printing device is moved to form an image, and the printing device is fixed and the thermal recording medium is moved. In some cases, an image is formed by using this. In the latter case, a roll-shaped thermosensitive recording medium is unwound as necessary, or the thermosensitive recording medium is repeatedly formed into an endless belt by using a movable shaft such as the roller 10 as shown in FIG. 1 as described above. The method used can be considered.

Next, the structure of the present invention will be sequentially described in detail.

The thermosensitive recording medium in the present invention contains at least a reversible thermosensitive recording layer and a light scattering layer in its laminated structure. As an example of the embodiment of the lamination, as shown in FIG. 1, one in which a transparent support is interposed between the reversible thermosensitive recording layer and the light scattering layer is applied. Incidentally, when the reversible thermosensitive recording layer itself has a sufficient coating film strength, the transparent support is not always necessary.

In this case, as the transparent support, a synthetic resin film of polyvinyl chloride, polyester, polycarbonate, polyacetate, polyimide or the like, transparent glass or the like can be used.

With a reversible thermosensitive recording layer whose transparency can change reversibly with temperature, the transparency when it is once heated and then cooled to around room temperature is different from that before heating, and when it is further heated, it returns to the original transparency. Moreover, it means that this phenomenon can be repeated. As such a reversible thermosensitive recording layer, those proposed in JP-A-3-180388 can be applied to the present invention.

That is, the reversible thermosensitive recording layer has a structure in which an organic low molecular weight substance is dispersed in an organic high molecular weight substance.

The organic polymer substance has good transparency,
Those having excellent mechanical strength and good film-forming property are preferable. Specific examples thereof include polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-acrylate copolymer. , Polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-acrylonitrile copolymer, polyester resin, polyamide resin, acrylic resin, silicone resin and the like. Among these, particularly preferable are vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate-maleic acid copolymer, vinyl chloride-vinyl acetate-vinyl alcohol copolymer, and polyester resin.

As the organic low molecular weight substance, alkanol,
Alkanediol, halogenoalkanol, halogenoalkanediol, alkylamine, alkane, alkene, alkyne, halogenoalkane, halogenoalkene,
Halogenoalkyne, cycloalkane, cycloalkene,
Cycloalkynes, saturated or unsaturated mono- or dicarboxylic acids and their esters, amides or ammonium salts, saturated or unsaturated halogeno fatty acids and their esters, amides or ammonium salts, halogenoallylcarboxylic acids and their esters, amides or ammonium salts , Thioalcohols, thiocarboxylic acid polymers and their esters, amides or ammonium salts, carboxylic acid esters of thioalcohols, etc., having 10 carbon atoms.
-40 and a molecular weight of 100-700. Particularly preferred is a melting point of 50 to 150 ° C.
And higher fatty acids such as montanic acid, lauric acid, palmitic acid, stearic acid, arachidic acid and behenic acid, and their esters, amides and ammonium salts.

The mixing ratio of the organic high molecular weight substance and the organic low molecular weight substance is preferably 5 parts by weight to 200 parts by weight of the organic low molecular weight substance based on 100 parts by weight of the organic high molecular weight substance. It is preferably in the range of 10 to 100 parts. When the amount of the organic low molecular weight substance is less than 5 parts, the reversible thermosensitive recording layer is not sufficiently clouded and it is difficult to obtain contrast. On the other hand, if the amount is more than 200 parts, the film formability of the reversible thermosensitive recording layer will be deteriorated.

Further, in the present invention, in order not to adversely affect the printing device and to prevent the transparency from being lowered by repeated heating and cooling on the reversible thermosensitive recording layer side,
The protective layer 2 can be provided on the side of the thermosensitive recording medium that is heated by the printing device.

On the other hand, the light-scattering layer constituting the thermosensitive recording medium of the present invention transmits and scatters a certain amount of light, and for example, a resin layer containing a light-scattering filler on a transparent support. Is provided by printing or coating, frosted glass-like one, one with fine scratches on the surface of a transparent film, glass or film containing a light-scattering filler, translucent paper such as tracing paper, or these Examples thereof include those formed by laminating on a transparent support via an adhesive.

The printing apparatus constituting the present invention is for recording and erasing images having different degrees of transparency on the above-mentioned thermal recording medium, and at least a heating means such as a thermal head, a heating plate, a heat roll and a laser beam. It uses one. As a heating means for forming a clear image, it is preferable to use a thermal head or a laser beam. Further, when it is necessary to erase the entire image, a thermal head or a laser beam can be used, but it is more preferable to use a heat roll or a hot plate.

Printing and erasing may be performed by the same printing device, and printing and erasing may be performed by different printing devices.

Furthermore, regarding the positional relationship between the laminated structure of the printing device and the thermosensitive recording medium, the printing device and the reversible thermosensitive recording layer are used because heat for printing does not disperse and hinders image formation. And preferably face each other or directly via a protective layer.

The light irradiating device constituting the present invention is for irradiating the above-mentioned thermosensitive recording medium with light, and includes a halogen lamp, a fluorescent lamp, a mercury lamp, a xenon lamp, a neon lamp,
A light emitting diode, a plasma luminous body, an EL luminous body, etc. can be used. It is also possible to use a reflecting mirror as shown in FIG. 1 in order to irradiate the heat-sensitive recording medium with light uniformly.

The form of the image formed by the printing device on the thermosensitive recording medium constituting the present invention is only required to have a contrast of transparency between the image portion and the non-image portion so as to be visible through the display. Therefore, for example, the case where the image portion is the opaque portion and the non-image portion is the transparent portion, or the case where the image portion is the transparent portion and the non-image portion is the opaque portion can be applied to the present invention.

[0026]

EXAMPLES The following paint was applied to one surface of a transparent polyethylene terephthalate film having a thickness of 75 μm and dried to form a reversible thermosensitive recording layer having a thickness of 6 μm. -Behenyl montanate 95 parts by weight-N, N'-distearyl dodecanedioic acid amide 5 parts by weight-Vinyl chloride-vinyl acetate copolymer 300 parts by weight-Tetrahydrofuran 1600 parts by weight Furthermore, phosphazene on the reversible thermosensitive recording layer. A resin (U-2000, manufactured by Idemitsu Petrochemical Co., Ltd.) was coated, and the coated surface was cured by ultraviolet rays to form a heat resistant protective layer having a thickness of 2 μm.

On the other surface of the transparent polyethylene terephthalate film, the following paint was applied and dried to a thickness of 4
A light-scattering layer having a thickness of μm was formed to prepare a heat-sensitive recording medium which constitutes the present invention. -Calcium carbonate 50 parts by weight-Polyester resin 50 parts by weight-Methyl ethyl ketone 100 parts by weight The thermosensitive recording medium is formed into an endless belt with a width of 21 cm and a circumference of 120 cm to form an endless belt, and a thin film of 8 pieces / mm with respect to the transparent thermosensitive recording medium. Type thermal head with applied pulse width of 2.0 msec and applied energy of 0.42 mj / d
Under the condition of ot, the image was made opaque (whitening).

On the other hand, as the light irradiating device, one 10 W fluorescent lamp having a reflecting mirror on the back surface is used, and light is irradiated in the same manner as shown in FIG. Looking at the light scattering layer of the recording medium, a dark image could be clearly observed on a light background. The image once recorded on the thermosensitive recording medium is completely erased by moving it in the direction of the arrow in FIG. 1 at a moving speed of 20 mm / sec and contacting it with a heat roll (diameter 5 cm, set temperature 110 ° C.). (Transparent state) and it became possible to print again. The image printing and erasing were repeated 200 times continuously, but the image visibility did not change.

[0029]

As described above, the thermosensitive recording medium having the reversible thermosensitive recording layer and the light scattering layer, the printing device and the light irradiating device are arranged at the above-mentioned predetermined places, and the transparency is imaged by the printing device. By irradiating the changed thermal recording medium with light from a light irradiation device and projecting an image on the thermal recording medium, a bright and dark image with excellent visibility could be obtained.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a display device and a display method of the present invention.

[Explanation of symbols]

 1 Light Irradiation Device 1-1 Halogen Lamp 1-2 Reflector 2 Protective Layer 3 Reversible Thermosensitive Recording Layer 4 Transparent Support 5 Light Scattering Layer 6 Thermosensitive Recording Medium 7 Printing Device 7-1 Thermal Head 7-2 Heat Roller 8 Transparent Part 9 Opaque part 10 Roller 11 Platen roll 12 Viewer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takeshi Suzuki Takeshi No. 3-1, Somune-cho, Shizuoka-shi, Shizuoka Pref., Electronic Materials Research Laboratory, Tomagawa Paper Mill Co., Ltd. (72) Nagao Makino Somoku-cho, Shizuoka-shi, Shizuoka No. 3 No. 1 Electronic Materials Research Laboratory, Tomoegawa Paper Co., Ltd.

Claims (3)

[Claims] 1. A heat-sensitive recording medium comprising a reversible heat-sensitive recording layer whose transparency can be reversibly changed with temperature and a light-transmitting and light-scattering light-scattering layer, and the heat-sensitive recording medium. A display device comprising: a reversible thermosensitive recording layer, which comprises the above, and a printing device provided with a heating means capable of changing transparency in an image manner, and a light irradiation device. 2. A heat-sensitive recording medium comprising a reversible heat-sensitive recording layer whose transparency can change reversibly with temperature and a light-transmissive and light-scattering light-scattering layer, provided with a heating means. An image is formed or erased by a printing device, and a light irradiation device irradiates the image with light from the side of the reversible thermosensitive recording layer constituting the thermosensitive recording medium, and the image is visually recognized from the other surface of the irradiation surface. A display method characterized by: 3. A display device according to claim 1, wherein a lens is arranged at least between the light irradiation device and the thermal recording medium and between the thermal recording medium and the viewer. And display method.