JPH05158416A - Display device - Google Patents

Abstract

PURPOSE:To obtain the display device which does not emit light by itself, does not require a back light as a high contrast is obtainable and does not exert a burden on an operator as this device does not flicker by having a heating element, a transparent sheet to cover a base along a recessed part and ink packed into the inside of a hole. CONSTITUTION:A circular conical recessed part 1a is provided on the base 1 and the cylindrical hole 1b is provided at the center continuously with the recessed part 1a. The heating element 2 is provided around the hole 1b in the lower part of the hole 1b. The hole 1b and a part of the recessed part 1a are coated with the transparent sheet 3, by which a closed space is formed. The black ink 4 is packed into this closed space. The heating element 2 generates heat by energizing the heating element 2. A bubble 6 which is the vapor of the ink 4 is generated in the ink 4 in the hole 1b and the ink 4 is pushed up by the generation of the bubble 5, by which the ink 4 is moved to the recessed part 1a side to increase the surface area in contact with the sheet 3. This state is a lighting state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device used for OA equipment and the like.

[0002]

2. Description of the Related Art Conventionally, various types of displays have been used for televisions, office equipment and the like. For example, a cathode ray tube display is often used in televisions and large office equipment, and a liquid crystal display is often used in portable televisions and small office equipment. Plasma displays are also used in office equipment.

[0003]

However, all of the conventional displays realize a seamless image by utilizing the afterimage phenomenon while repeating blinking, and there is a risk of burdening the operator. Was.
In addition, since the cathode ray tube display emits the cathode ray from the screen, there is a risk that the cathode ray may impair the health of the operator. A liquid crystal display has poor visibility because it can obtain only low contrast. Further, most of the displays give a larger amount of light to the operator than the amount of ambient light due to the light emission of the display itself or the light emission from the backlight, which imposes a heavy burden on the operator's eyes.

Further, when transmitting a character to a blind person, a method of converting the character into a voice and transmitting it, or embossing the paper with a braille typewriter to print the braille has been used. With the method used, sound is generated sequentially, so it takes a long time to obtain the necessary information, and when printing and checking the information using a braille printer, etc., it takes more time, as well as the entire device. Will be a big one.

The present invention solves these problems.
An object of the present invention is to provide a display device that does not emit light by itself, does not require a backlight because high contrast is obtained, and does not blink, and thus does not burden the operator.

A further object of the present invention is to provide a display device which can be applied to Braille display and is compact and capable of transmitting Braille quickly.

[0007]

In order to solve the above-mentioned problems, the display device of the present invention comprises a base, a conical recess provided in the base, a hole provided in the center of the recess, and the hole. And a transparent sheet that covers the base in a state of being along the recesses, and ink filled in the holes.

Furthermore, the display device of the present invention comprises a base, a hemispherical recess provided in the base, a hole provided in the center of the recess, and a heating element provided under the hole.
A flexible sheet that covers the base along the recesses and ink filled in the holes are provided, and reversible dimples are provided in the portions of the sheet corresponding to the recesses.

[0009]

With the above structure, the ink heated by the heating element generates air bubbles, and the ink pushed up by the air bubbles moves between the sheet and the concave portion to be in a lighting state. Further, when the ink moves between the sheet and the concave portion, the dimples are inverted and embossed, and the transmission as Braille is possible.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing one cell of the display device according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a white zirconia ceramic base, which is provided with a conical recess 1a and a cylindrical hole 1b which is continuous with the recess 1a at the center. Reference numeral 2 denotes a heating element which is provided below the hole 1b and around the hole 1b and which generates heat when energized. 3 is a recess 1
It is a transparent sheet that covers the base 1 along the line a and is fixed to the upper surface of the base 1 with an epoxy adhesive. The hole 1b and the recess 1a are partially covered by the sheet 3 to form a closed space. ing. The black ink 4 is filled in the closed space.

The lighting operation of the display device of this embodiment having the above-described structure will be described below with reference to FIGS. 2 and 3.
Will be explained. First, when the heating element 2 is energized, the heating element 2 generates heat and bubbles 5 which are vapors of the ink 4 are generated in the ink 4. The ink 4 is pushed up by the generation of the bubbles 5, and the ink 4 moves to the recess 1a. Therefore, when the ink 4 moves to the upper part of the conical recess 1a due to the movement of the ink 4 from the state of the ink 4 shown in FIG. 3 (a), as shown in FIG. Increase the surface area of contact. This state is a lighting state. Next, when the power supply is stopped, the ink 4 cools, the bubbles 4 disappear, and the ink 4 is stored in the hole 1b.

FIG. 4 (a) is a plan view showing an example of characters displayed on the display of this embodiment, and FIG. 4 (b) is a view clearly showing that the displayed characters are "A". In FIG. 4, 6 is a cell in which the ink 4 has moved to the concave portion 1a and is in a lighting state, and 7 is a cell in which the ink 4 is in the hole 1b and is in a non-lighting state. In the cell 6, since the ink 4 is located in the recess 1a, a black dot is formed, whereas in the cell 7, the ink 4 is located in the hole 1b, so that the color of the base 1 can be seen through the sheet 3 and thus the white color is obtained. Dots will be displayed.

According to this embodiment, the reaction speed is determined by the heat capacity of the ink 4 itself and the heat transfer coefficient of the base 1, so that even if the heating element 4 is driven by a periodic pulse current,
The volume of the bubble 5 does not change abruptly, and a flicker-free display can be obtained.

Further, as shown in FIG. 3, since the area ratio during lighting and non-lighting is a contrast, a very high contrast can be obtained, no backlight is required, and the light itself is emitted. Since it does not occur, it is possible to obtain a display that does not burden the operator.

FIG. 5 is a sectional view showing a main part of a display device according to a second embodiment of the present invention. In FIG. 5, reference numeral 11 is a white zirconia ceramic base, and this base 11 is provided with a hemispherical recess 11a having a diameter of 0.5 mm, for example, and a cylindrical hole 11b is formed continuously in the center of the recess 11a. It is provided. Reference numeral 12 denotes a heating element which is provided below the hole 11b and around the hole 11b and which generates heat when energized.
13 is a flexible transparent sheet that covers the base 11 along the recess 11a and is fixed to the upper surface of the base 11 with an epoxy adhesive, and the holes 11b and part of the recess 11a are sheets 13.
To form a closed space. Recess 11 in seat 13
A reversible dimple 13a is provided in the portion that covers a, and has a shape that substantially coincides with the recess 11a when not operating. Reference numeral 14 is an alcohol-based ink filled in the closed space. A large number of these dimples 13a and the corresponding recesses 11a are provided in a matrix on the same plane.

The operation of the display device of this embodiment having the above-described structure will be described below with reference to FIGS. 5 and 6. First, when the heating element 12 is energized, the heating element 12 generates heat and bubbles 5 which are vapors of the ink 14 are generated in the ink 14. The ink 4 is pushed up by the generation of the bubbles 15, and the ink 14 moves to the recess 11a. Therefore, in FIG.
As shown in, the ink 14 moves to the concave portion 11a and further inverts the dimple 13a. At this time, multiple dimples
Braille can be constructed by selectively reversing 13a. Next, when the power supply is stopped, the ink 14 cools, the bubbles 15 disappear, and the ink 14 is stored in the hole 11b.

Although alcohol is used as the medium of the ink 14 in this embodiment, it is possible to use a base having a lower boiling point. According to the present embodiment, it is possible to generate Braille by electrical control, so that the CD-RO
It can also be used as a transmission means of a device that stores a large amount of information such as M.

[0018]

As described above, according to the present invention, the ink heated by the heating element generates bubbles, and the ink pushed up by the bubbles moves between the sheet and the recessed portion to become a lighting state and react. Since the speed is determined by the heat capacity of the ink itself and the heat transfer coefficient of the base, the volume of the bubbles does not change rapidly even if the heating element is driven by a periodic pulse current, and a flicker-free display can be obtained. In addition, since the area ratio between when the lamp is lit and when it is not lit is the contrast, a very high contrast can be obtained, no backlight is needed, and no light is emitted by itself, so the display does not burden the operator. The device can be obtained.

Further, the ink heated by the heating element generates bubbles, and the ink pushed up by the bubbles moves between the sheet and the concave portion to invert the dimples so that the embossed state can be obtained and electrical control is performed. As a result, Braille can be generated, so that it can also be used as a transmission means of a device storing a large amount of information such as a CD-ROM.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts of a display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the display device according to the first embodiment during lighting.

FIG. 3 is a plan view of a main part of the display device according to the first embodiment when it is not lit and when it is lit.

FIG. 4 is a main-portion plan view illustrating an example of a display state of the display device according to the first embodiment.

FIG. 5 is a cross-sectional view of essential parts of a display device according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of essential parts of the display device of the second embodiment during operation.

[Explanation of symbols]

 1,11 Base 1a, 11a Recess 1b, 11b Hole 2,12 Heating element 3,13 Sheet 4,14 Ink 5,15 Bubble 13a Dimple

Claims (2)

[Claims] 1. A base, a conical recess provided in the base, a hole provided in the center of the recess, a heating element provided at a lower portion of the hole, and the base covering the recess along the recess. A display device comprising a transparent sheet and ink filled in the hole. 2. A base, a hemispherical recess provided in the base, a hole provided in the center of the recess, a heating element provided under the hole, and the base covering the recess along the recess. A display device comprising a flexible sheet and ink filled in the holes, wherein a reversible dimple is provided in a portion of the sheet corresponding to the recess.