JPH05333791A - Display device - Google Patents

Abstract

PURPOSE:To provide a flat panel type display device which is made low in power consumption for display operation and manufacture cost, and can enter a visualization state for displaying a desired picture, characters, and a moving picture at a high speed by preheating a thermochromic layer and can securely and efficiently maintain the state and also obtains a sharp image. CONSTITUTION:The display device 1 which has at least a couple of a 1st electrode and a 2nd electrode 6 provided opposite each other and crossing each other, a heating body layer 4 whose heat generation is controlled by a controller 3, and a heat sensitive member layer 7 and also has the heating body layer 4 sandwiched between the 1st and 2nd electrodes 5 and 6 and is provided with the heat sensitive member layer 7 on the opposite side from the heating body layer 4 across one electrode is provided with a 3rd electrode 8 at one end of the heating body layer 4 and a 4th electrode 9 on the other opposite end; and means which individually and independently control electric feeding are provided between the 1st electrode 5 and 2nd electrode 6, and 3rd electrode 8 and 4th electrode 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat panel display device using a thermosensitive recording material formed in a sheet shape using thermochromic which is a thermosensitive member.

[0002]

2. Description of the Related Art In the prior art, a flat panel display device for displaying numbers, letters, katakana and simple figures includes LEDs (light emitting diodes), PDPs (plasma), VDFs (fluorescent display tubes) and Those using an LCD (liquid crystal) or the like have been put into practical use.

[0003]

The conventional display device as described above is not suitable for low power consumption because the voltage must be continuously applied during the display operation in order to maintain the display state. It requires a clean room and expensive equipment such as crystal growth to manufacture the display member, resulting in high manufacturing costs and no device for preheating the thermochromic layer. However, there is a problem that a visualization state for displaying a character or a moving image cannot be reliably and efficiently obtained with a fast response speed and a clear image cannot be obtained.

Therefore, the object of the present invention is to reduce the power consumption during display, the manufacturing cost is low, the thermochromic layer is preheated, and the visualization state for displaying a desired picture, character or moving image is fast. (EN) It is possible to provide a flat panel display device capable of responding at a speed, reliably and efficiently holding it stably, and obtaining a clear image.

[0005]

In order to achieve the above-mentioned object, the present invention provides a first aspect of the present invention, wherein at least a pair of intersecting first and second electrodes are provided so as to face each other. A heating element layer of which heat generation is controlled by a control device; and a heat-sensitive member layer, wherein the heating element layer is sandwiched between the first and second electrodes, and one of the electrodes is interposed between the heating element layer and the heating element layer. In a display device in which the heat-sensitive member layer is provided on the opposite side, a third electrode is provided at one end of the heating element layer, and a fourth electrode is provided at the opposite other end, and a space between the first electrode and the second electrode, and Third electrode,
It is characterized in that a means for controlling energization is provided separately and independently from the fourth electrode. Claim 2
The invention of claim 1 has at least a pair of intersecting first and second electrodes provided to face each other, and a heat-sensitive member layer whose heat generation is controlled by a controller, and the heat-sensitive member layer is provided between the electrodes. In the sandwiched display device, a third electrode is provided at one end of the heat-sensitive member layer, and a fourth electrode is provided at the other end facing the heat-sensitive member layer, and the third electrode and the fourth electrode are provided between the first electrode and the second electrode. And a means for controlling energization separately and independently. According to a third aspect of the invention, in the first or second aspect of the invention, the heat-sensitive member layer is made of a thermochromic material that is thermally reversible. Claim 4
In the invention of claim 1 or 2, the first temperature of the first region is lower than or equal to a temperature at which the heat-sensitive member layer does not visualize, and the second temperature of the second region is a temperature at which the heat-sensitive member layer visualizes. Therefore, a means for controlling the energization amount applied between the third electrode and the fourth electrode is provided. The invention of claim 5 is the same as the invention of claim 1 or 2, wherein the first electrode and the second electrode
It is provided with means for controlling such that energization is not performed simultaneously between the electrodes and between the third electrode and the fourth electrode. According to a sixth aspect of the present invention, in the first or second aspect of the present invention, the heating element layer or the heat-sensitive member layer is a uniform layer, or a lattice pattern shape matching the shapes of the first electrode and the second electrode, or the third layer. The electrodes and the fourth electrode can be energized and have a linear shape that matches the shapes of the first electrode and the second electrode.

[0006]

In this invention as described above, the invention according to claim 1 is such that at least a pair of intersecting first and second electrodes provided to face each other, and a heat-generating layer whose heat generation is controlled by a controller. And a heat-sensitive member layer, and the first,
In a display device in which the heating element layer is sandwiched between second electrodes, and the heat-sensitive member layer is provided on the opposite side of the heating element layer with one electrode interposed therebetween, one end of the heating element layer faces the third electrode. A fourth electrode is provided at the other end of the first electrode and the second electrode, and separately between the first electrode and the second electrode and between the third electrode and the fourth electrode, and
A means for independently controlling energization is provided, and current is energized in the thickness direction of the heating element layer at the intersection of the first electrode and the second electrode, and that portion generates heat to visualize the heat-sensitive member layer. Further, the control device energizes between the third electrode and the fourth electrode to uniformly generate heat in the entire heating element layer to visualize the heat-sensitive member layer. According to the invention of claim 2, at least a pair of intersecting first and second electrodes, which are provided so as to face each other,
A heat-sensitive member layer whose heat generation is controlled by a control device,
In a display device in which the heat-sensitive member layer is sandwiched between the electrodes, a third electrode is provided at one end of the heat-sensitive member layer, and a fourth electrode is provided at the opposite other end, and between the first electrode and the second electrode, And a means for independently and independently controlling energization between the third electrode and the fourth electrode, and in the thickness direction of the heat-sensitive member layer at the intersection of the first electrode and the second electrode. When electricity is applied, the part generates heat, and the heat is efficiently transferred to the heat-sensitive member layer to visualize it. In addition, the first electrode and the second electrode are separately and independently energized by the control device between the third electrode and the fourth electrode to uniformly generate heat in the entire heat-sensitive member layer, Efficiently transfer heat to the layer and visualize it.
According to a third aspect of the present invention, in the first or second aspect of the present invention, the heat-sensitive member layer is made of a thermochromic material that is thermally reversible, so that it is reversibly visualized by being heated. A fourth aspect of the invention is the first or second aspect of the invention according to the first or second aspect.
The temperature is below the temperature at which the heat-sensitive member layer does not visualize,
The second temperature of the second region is provided with a means for controlling the amount of current applied between the third electrode and the fourth electrode so that the temperature of the heat-sensitive member layer becomes visible, and the first temperature is set to the heat-sensitive member layer. When writing information by applying a thermal bias, the electric power for raising the temperature for writing from room temperature can be reduced, the writing speed can be increased, and at the second temperature, the entire surface of the heat-sensitive member layer becomes cloudy (or Set to the decolored state or the transparent (or colored) state. According to a fifth aspect of the invention, in the first or second aspect of the invention, control is performed so that energization is not performed simultaneously between the first electrode and the second electrode and between the third electrode and the fourth electrode. A means is provided to reproduce the halftone without variation in the visualization process of the heat-sensitive member layer. According to a sixth aspect of the present invention, in the first or second aspect of the present invention, the heating element layer or the heat-sensitive member layer is a uniform layer, or has a lattice pattern shape that matches the shapes of the first electrode and the second electrode, or Since the third electrode and the fourth electrode can be energized and have a linear shape that matches the shapes of the first electrode and the second electrode, the heat-sensitive member layer has a minute heat-generating portion. Also, heat diffusion does not occur and only that part is visualized.

[0007]

Embodiments of the present invention are shown in FIGS. Since the first embodiment of the present invention shown in FIG. 1 and other embodiments other than the above are common in many parts, the same reference numerals as those in the first embodiment are used for such parts, and Description will be omitted, and mainly different parts will be described.

In FIG. 1 showing the first embodiment, a display device 1 comprises a display member 2 and a control device 3, and the display member 2
Is provided with a thin wire-shaped first electrode 5 on one surface of the heating element layer 4 and a thin wire-shaped second electrode 6 on the other surface, and the first electrode 5 and the second electrode 6 sandwich the heating element layer 4. And address electrodes are arranged in a matrix so as to be opposed to intersect with XY, and the third electrode 8 is provided at one end of the heating element layer 4, and the fourth electrode is provided at the other end opposite to the address electrode. 9 is provided on the same surface, and the heat-sensitive member layer 7 is provided on the opposite side of the heating element layer 4 via the first electrode 5. The control device 3 includes a CPU 12 and a processing circuit 20.
, ROM 21, output circuit 22, X address selection circuit 10
And a Y address selection circuit 11. The first electrode 5 and the second electrode 6 are driven by a control signal from the CPU 12 by an X address selection circuit 10 and a Y address selection circuit 11, and electricity is applied in the thickness direction of the heating element layer 4 at the X and Y address intersections. Then, that part generates heat. Heat generation is controlled by the amount of current for energization and the energization time. The third electrode 8 and the fourth electrode 9 apply a voltage controlled by the CPU 12 by the end face electrode power supply 13 and the end face electrode control circuit 14 to the heating element layer 4 to control the heat generation of the entire heating element layer 4. ..

In the first embodiment, the heat sensitive member layer 7 provided on the heating element layer 4 via the first electrode 5 is made of a thermochromic material which is thermally reversible.
The energization of the electrode 5 and the second electrode 6, and the third electrode 8 and the fourth electrode 9 are controlled independently and independently by the CPU 12, and the distance between the electrodes of the first electrode 5 and the second electrode 6 is controlled. The heating element layer 4 partially generates heat in a minute area by the energization in, and the minute area portion of the heat-sensitive member layer 7 is visualized. In addition, the state of heat generation on the entire surface is controlled by energization between the third electrode 8 and the fourth electrode 9, and the visualization of the entire heat-sensitive member layer 7 is controlled.

In the first embodiment, as shown in FIG.
The substrate 19 is a heat-resistant polyimide film having a thickness of 20 μm to 100 μm, a conductive substance is vapor-deposited on the surface thereof, and then copper or the like is provided in a thin wire shape by an electrodeposition method to form the second electrode 6,
On top of that, a uniform heating element layer 4 having a thickness of 5 μm to 50 μm is provided by adding metal oxide or the like to the polymer and generating heat by energization.
A conductive material is provided in a thin line thereon by vapor deposition or screen printing to form the first electrode 5, the third electrode 8, and the fourth electrode 9. The heating element layer 4 may be composed of a metal foil of nickel chrome or stainless steel (or an electrodeposition method), and the electrode material used in the screen printing method is a silver paste containing silver powder as a main component or carbon particles in a polyimide resin. A dispersed product is used. A colored layer 18 having a thickness of 5 μm or less and a heat-sensitive member layer 7 are provided on the first, third and fourth electrodes 5, 8 and 9. A protective layer 23 is applied to the surface of the heat sensitive member layer 7. The assembling of the display member 2 is not limited to the above order, and the coloring layer 18 and the first, third and fourth electrodes 5, 8 and 9 are provided on the heat sensitive member layer 7, and the second member is provided on the substrate 19. Electrode 6 and heating element layer 4
It is also possible to provide and to bond both.

The visualization state of the thermochromic material, which is the heat-sensitive material used in the first embodiment, differs depending on the material.
Two characteristic examples are shown. In FIG. 3, the vertical axis represents the cloudiness and the transparent state, and the horizontal axis represents the temperature at which the thermochromic material is heated. First, when the temperature of the thermochromic material in the cloudy state A is raised from room temperature to the temperature T1, the transparent state B is obtained. When the temperature of the heat-sensitive material is lowered to room temperature after the temperature is raised to the temperature T1, the transparent state B is maintained. After the temperature is further raised from the temperature T1 to the temperature T2, the non-energized state is entered, and when the temperature of the heat-sensitive material is lowered to near room temperature, the white turbid state A is maintained. First, in the case of the heat-sensitive material in the transparent state B, when the temperature of the heat-sensitive material is lowered to near room temperature after the temperature is raised to the temperature T2, the white turbid state A
Held in. Transparent state B when temperature rise is up to temperature T1
Is retained as is. This thermochromic material forms a heat-sensitive material layer using a polymer / low molecule as a dispersion film, and the low molecule is composed of particles of 0.1 μ to 5 μ, and if the crystal state of the particles is polycrystal, the incident light is large. Light is scattered by the crystal to become a cloudy state A, and if the crystal state of the particles is a relatively large crystal, the incident light is not scattered by the crystal and becomes a transparent state B.

FIG. 4 shows the characteristics of another thermochromic material. In FIG. 4, the vertical axis represents the decolored and colored state, and the horizontal axis represents the temperature at which the thermochromic material is heated. First, the heat-sensitive material in the decolored state D is passed from the room temperature through the temperature T1 ′ to T2 ′.
When the temperature is raised up to, the coloring state C is reached. After the temperature is raised to the temperature T2 'and the temperature of the heat-sensitive material is lowered to room temperature, the color development state C is maintained. When the heat-sensitive material in the coloring state C near room temperature below the temperature T0 'is heated to the temperature T1' through the temperature T0 ',
When the temperature of the heat-sensitive material is lowered to near room temperature, the decolored state D is maintained as the density decreases in the state of the broken line to the decolored state D.
When the temperature is raised again to the temperature T2 ', the coloring state C is reached, and the coloring state C is maintained even if the temperature is lowered to near room temperature. The thermochromic material in which such a state of decoloring and coloring is repeated is composed of a coloring agent, a decoloring material, and a binder. Further, in these thermochromic materials, the state change between white turbidity and transparency or the state change between decolorization and color development can be reversibly repeated by thermal control.

In the first embodiment, when the heat-sensitive material having the above-mentioned characteristics is heated by the heating element layer 4 to be visualized, the temperature rising temperature to be visualized is the temperature T shown in FIGS.
1, T2 or T1 ', T2'. An image is formed by energizing the first and second electrodes 5 and 6 with a command signal from the CPU 12. Also, erase the entire formed image,
Before forming an image by energizing between the second electrodes 5 and 6, a temperature is applied to the heat-sensitive member layer 7 so that energizing energy of the first and second electrodes 5 and 6 can be reduced. Reduce local variations in temperature rise.

Since the heat-sensitive material having the characteristics shown in FIG. 3 becomes cloudy or transparent, a coloring layer 18 is provided between the first electrode 5 and the heat-sensitive member layer 7 as shown in the sectional view of FIG. Provided,
In the transparent state, the color of the colored layer 18 can be displayed. For example, when the colored layer 18 is black, if the entire surface of the heat-sensitive member layer 7 is made cloudy and the portion for forming an image or a character is made transparent, black is displayed on a white background. To make the entire surface of the heat-sensitive member layer 7 cloudy, the third and fourth electrodes 8,
9 is energized to raise the temperature of the heating element layer 4 to T2, and then
The temperature of the heating element layer 4 is set to a temperature of T0 or lower and close to room temperature. After forming an image by energizing the first and second electrodes 4 and 5 after the entire surface becomes cloudy, the third and fourth electrodes 8 and 9 are again formed.
When the temperature of the heating element layer 4 is raised to T01 by energizing the device, energization to the first and second electrodes 5 and 6 is sufficient with energy for raising the temperature from T01 to T1. The amount of energy required for raising the temperature to T1 may be less and power consumption can be reduced. As described above, the energization amount or energization time is changed for the third and fourth electrodes 8 and 9 so that the temperatures of two different regions can be controlled. This temperature control is performed by providing a temperature detector 17 on the heat-sensitive member layer 7 and inputting its output to the CPU 12.

Since the heat-sensitive material having the characteristics shown in FIG. 4 is in a colored and decolored state, the colored layer 18 shown in the sectional view of FIG. 2 is white. Thus, in the decolored state, the white color of the colored layer 18 becomes the display color of the entire surface. In order to form an image or characters, the minute portion is heated to the temperature T2 'by energizing the first and second electrodes 5 and 6.
When the temperature is raised to 0, a color-developing state is brought about, and a color-developing display peculiar to the heat-sensitive material layer 7 is obtained on a white background at room temperature. In order to bring the entire surface of the heat-sensitive member layer 7 into the decolored state, the third and fourth electrodes 8 and 9 are energized to raise the temperature of the heating element layer 4 to T1 ′, and then the heating element layer 4 is heated.
Even if the temperature is near room temperature, the entire surface is in the decolored state. When forming an image, if the third and fourth electrodes 8 and 9 are again energized to raise the temperature of the heating element layer to T0 ', the energization to the first and second electrodes 5 and 6 will be T0 'to T1' or T
The energy required to raise the temperature to 2'is sufficient, and the energy required to raise the temperature from room temperature may be less, and power consumption can be reduced. In this way, the temperature of two different regions is controlled by changing the energization amount or the energization time for the third and fourth electrodes 8 and 9.

In the first embodiment, the first and second electrodes 5,
When electricity is continuously supplied in step 6, if there is a concentrated heat generation portion, the diffusion of heat from that portion also raises the ambient temperature and causes visualization. This visualization causes image bleeding, blurring, and noise, and the quality of the display device 1 deteriorates. To prevent these, when an image is formed by energizing the first and second electrodes 5 and 6, for example, if the second electrode 6 is a scanning electrode,
Instead of scanning the electrodes in order,
Alternatively, scanning is performed by randomly skipping between the scanning electrodes. Similarly, when the first electrode 5 is used as a signal electrode, signals are sequentially input to the first electrode 5 at intervals without inputting signals. As a result, for example, even if there is a concentrated heat generation portion, minute portions that heat up are dispersed, and the heated next minute portion cools down to some extent before the next adjacent signal is input, which adversely affects the surrounding image. I don't.

In the first embodiment, the first and second electrodes 5,
The energization of 6 and the timing of energizing the third and fourth electrodes 8 and 9 are separately and independently controlled by the control device 3 so that energization of both electrodes is not performed simultaneously. ing. This causes interference between the first and second electrodes 5 and 6 and the third and fourth electrodes 8 and 9 (especially between the first and second electrodes 5 and 6 close to the third and fourth electrodes 8 and 9). This is to prevent it from happening. Further, in order to prevent interference, the first and second electrodes 5, 6
And the distance between the third and fourth electrodes 8 and 9 is set to be several times or more the electrode distance between the first electrode 5 and the second electrode 6, that is, the thickness of the heating element layer 4. When the heating element layer 4 is made of a metal foil, the thickness is 0.1 mm or less, and the distance between the first and second electrodes 5 and 6 and the third and fourth electrodes 8 and 9 is about 0.5 mm or more. When electricity is being applied between the third electrode 8 and the fourth electrode 9, the temperature of the heating element layer 4 is increasing, and the temperature control by electricity application between the first electrode 5 and the second electrode 6 is stable. Then it will not be done. When expressing a halftone, in the characteristics of FIG.
The temperature is controlled between 01 and T1, and the density of the cloudy state is controlled. In the characteristics shown in FIG.
The temperature is controlled between 2'to control the density of the coloring state.

In the first embodiment, the third and fourth electrodes 8,
In order to generate heat on the entire surface of the heating element layer 4 or the entire surface of the heat-sensitive member layer 7 by means of 9, the shape of the heating element layer 4, the heat-sensitive member layer 7, or both of them is not a flat plane layer but a crossing first layer. ,
It is possible to energize between the electrodes for a lattice pattern that matches the shape of the second electrodes 5 and 6, or for the third and fourth electrodes 8 and 9.
Moreover, even if the heating element is formed in the shape of a thin wire that matches the shapes of the first and second electrodes 5 and 6, it is possible to generate heat for image formation and erasing the entire image. In this kind of thing,
Even if minute heat-generating portions are concentrated, there is no heat diffusion, so that clear images can be obtained without adverse effects such as bleeding or blurring on the surrounding images.

The second embodiment of the present invention is not shown,
The heating element layer 4 is composed of a heat-sensitive member layer 7 that generates heat when energized, the heat-sensitive member layer 7 is provided with a function as the heating element layer 4, each electrode is provided, and the heating element layer 4 is removed. Other than that, there is no difference from the first embodiment.

In the heat-sensitive member layer 7 of the second embodiment, an additive is added to the heat-sensitive member for adjusting the resistance value so that the volume resistance, which is a characteristic of the heating element layer 4, becomes a value capable of generating heat. The additive is fine particles of metal or acicular crystals, and is added in an amount that does not impair the visualization characteristics of the heat-sensitive member layer 7. As a result, the heat-sensitive member layer 7 can be directly energized, and the heat generated by itself can improve the thermal efficiency. The characteristics of the heat-sensitive material with the adjusted resistance value are the same as those shown in FIGS.

In the third embodiment shown in FIG. 5, since the surface of the display member 2 is heated in the first and second embodiments, the heat insulating spacer 16 is provided on the surface to protect the operator more safely. A cover is provided with a transparent heat insulating sheet 15 through. The heat insulating sheet 15 is made of a material having a relatively high heat resistant temperature of 1 mm or less, and an air layer is used as a heat insulating layer for the display member 2.
By keeping it between the heat insulating sheet 15 and the heat insulating sheet 15, flexibility is provided. By creating an air flow in the heat insulation layer formed between the display member 2 and the heat insulation sheet 15, the effect as a heat insulation layer and a further cooling effect by the air flow can be obtained.

[0022]

The present invention is as described above, and in the invention of claim 1, heat generation is controlled by at least a pair of intersecting first electrodes and second electrodes provided facing each other, and a control device. A heat-generating member layer and a heat-sensitive member layer, and the heat-generating member layer is sandwiched between the first and second electrodes, and the heat-sensitive member layer is provided on the opposite side of the heat-generating member layer via one electrode. In the provided display device, a third electrode is provided at one end of the heating element layer, and a fourth electrode is provided at the other end opposite to the heating element layer, and the third electrode and the fourth electrode are provided between the first electrode and the second electrode. And a means for controlling energization separately and independently, and a heating element for generating heat in a minute portion for display and an auxiliary heating layer for heating the entire display surface. Since it can be composed of two heating element layers, the whole can be layered, flexible, light,
In addition, it has excellent transportability and functionality, and can efficiently transfer heat to the heat-sensitive member layer, resulting in low power consumption. The invention according to claim 2 has at least a pair of intersecting first and second electrodes provided to face each other, and a heat-sensitive member layer whose heat generation is controlled by a controller, and the heat-sensitive member is provided between the electrodes. In the display device that holds the member layers,
A third electrode is provided at one end of the heat-sensitive member layer, and a fourth electrode is provided at the other end facing the heat-sensitive member layer, separately between the first electrode and the second electrode and between the third electrode and the fourth electrode. In addition, since the heat-sensitive member layer is provided with a means for independently controlling energization to uniformly generate heat and efficiently transfer heat to the heat-sensitive member layer, heat transfer efficiency to the heat-sensitive member layer is improved. There is an effect that the power consumption can be improved, the power consumption can be reduced, and the response speed to be visualized can be increased. According to a third aspect of the present invention, in the first or second aspect of the present invention, since the heat-sensitive member layer is made of a thermochromic material having thermal reversibility, the thermosensitive member layer has a memory property capable of maintaining a visualized state at room temperature, Low power consumption in the middle
Further, there is an effect that the display device can be manufactured at low cost.
According to a fourth aspect of the invention, in the first or second aspect of the invention, the first temperature of the first region is equal to or lower than the temperature at which the heat-sensitive member layer does not visualize, and the second temperature of the second region is the heat-sensitive member layer. Since a means for controlling the amount of current applied between the third electrode and the fourth electrode is provided so that the temperature becomes visible, the first temperature is set from room temperature when writing information by applying a thermal bias to the heat-sensitive member layer. The power for heating for writing can be reduced and the writing speed can be increased, and at the second temperature, the entire surface of the heat-sensitive member layer becomes cloudy (or decolored) or transparent (or colored). There is an effect that visualization for displaying a desired picture, character or moving image can be reliably and efficiently and stably performed on the heat sensitive member layer and the response speed for visualization can be increased. According to a fifth aspect of the invention, in the first or second aspect of the invention, control is performed so that energization is not performed simultaneously between the first electrode and the second electrode and between the third electrode and the fourth electrode. Since the means is provided, there is an effect that halftones can be reproduced and displayed without variation in the visualization process of the heat-sensitive member layer, and the display contents can be enriched. According to a sixth aspect of the present invention, in the first or second aspect of the present invention, the heating element layer or the heat-sensitive member layer is a uniform layer, or has a lattice pattern shape that matches the shapes of the first electrode and the second electrode, or Since the 3rd electrode and the 4th electrode can be energized and have a linear shape that matches the shapes of the 1st electrode and the 2nd electrode, minute heat-generating portions concentrate on the heat-sensitive member layer. Even if it is present, heat diffusion does not occur, and there is an effect that a clear image can be obtained without causing blurring or blurring which is an adverse effect on surrounding images.

[Brief description of drawings]

FIG. 1 is a schematic perspective cutaway view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the display member of the above.

FIG. 3 is a characteristic diagram showing a temperature and a visualized state of a thermochromic material having the above-mentioned characteristics of transparency and cloudiness.

FIG. 4 is a characteristic diagram showing a temperature and a visualized state of a thermochromic material having the same coloring and decoloring characteristics as above.

FIG. 5 is a schematic perspective cutaway view of the above third embodiment.

[Explanation of symbols]

 1 Display Device 2 Display Member 3 Control Device 4 Heating Element Layer 5 First Electrode 6 Second Electrode 7 Heat Sensitive Member Layer 8 Third Electrode 9 Fourth Electrode 10 X Address Selection Circuit 11 Y Address Selection Circuit 12 CPU 13 Edge Surface Power Supply 14 End face electrode control circuit 15 Insulation sheet 16 Insulation spacer 17 Temperature detector 18 Colored layer 19 Substrate 20 Processing circuit 21 ROM 22 Output circuit 23 Protective layer

Claims (6)

[Claims] 1. At least a pair of intersecting first and second electrodes provided to face each other, a heating element layer whose heat generation is controlled by a control device, and a heat-sensitive member layer, wherein A display device in which the heat generating layer is sandwiched between second electrodes, and the heat-sensitive member layer is provided on the opposite side of the heat generating layer via one electrode, a third electrode is provided at one end of the heat generating layer,
A fourth electrode is provided at the other end facing each other, and is separately provided between the first electrode and the second electrode and between the third electrode and the fourth electrode.
Further, a display device comprising means for independently controlling energization. 2. A heat-sensitive member layer having at least a pair of intersecting first and second electrodes facing each other, and a heat-sensitive member layer whose heat generation is controlled by a controller, wherein the heat-sensitive member layer is provided between the electrodes. In the display device that holds the heat-sensitive member layer, a third electrode is provided at one end of the heat-sensitive member layer, and a fourth electrode is provided at the other end facing the heat-sensitive member layer, and the third electrode is provided between the first electrode and the second electrode, A display device comprising means for controlling energization separately and independently between the electrodes. 3. The display device according to claim 1, wherein the heat-sensitive member layer is made of a thermochromic material that is thermally reversible. 4. The first temperature of the first region is lower than the temperature at which the heat-sensitive member layer does not visualize, and the second temperature of the second region is
A third electrode so that the temperature of the heat-sensitive member layer becomes visible,
The display device according to claim 1 or 2, further comprising means for controlling an amount of current applied to the fourth electrode. 5. Between the first electrode and the second electrode, and the third electrode
3. The display device according to claim 1, further comprising means for controlling so that energization is not performed between the electrode and the fourth electrode at the same time. 6. The heating element layer or the heat-sensitive member layer is a uniform layer, or has a grid pattern shape matching the shapes of the first electrode and the second electrode, or the third electrode and the fourth electrode are energized. The display device according to claim 1 or 2, wherein the display device has a linear shape that is possible and matches the shapes of the first electrode and the second electrode.