JPS6061294A - Memory type card - 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 The present invention relates to a display card having a memory effect, and more particularly, the present invention relates to a display card having a memory effect, and more particularly, it does not have a power supply and circuitry necessary for driving.
The present invention relates to a card characterized in that display contents are written by another device having an exclusive drive unit.

In recent years, deposits with cash cards, savings deposits, etc.
Payments have become commonplace, but since the card itself does not have a display, withdrawals, withdrawals, withdrawals, and balance inquiries can only be made using the display on the parent device or the printouts from it. ing. However, since the card itself does not have a display, it is inconvenient that necessary information cannot be written down in a visually recognizable manner.If this point could be improved, the value of the card would be further improved. is assumed.

The present invention has been made to improve the drawbacks of such conventional cash cards and to provide the card with a memory display section. That is, the present invention does not have a power supply and a driving circuit, but only has a liquid crystal display section with a memory effect.
The memory card is characterized in that a lead terminal portion for driving the card is provided in a part of the card. - Conventional cash cards are made of extremely thin plastic molded bodies with a thickness of less than 1W1I, and it is impossible to provide rigidity to the entire card so that it does not deform due to external forces. Therefore, when a power source, a drive circuit, a display body, and their connecting parts are incorporated therein, defects are likely to occur during use. In applications where the parent device has sufficient functionality, such as when using a cash card, the card only needs to incorporate the display section and the lead terminals necessary to drive it by the parent device. As the number of parts used is reduced, failures are less likely to occur, and a reduction in thickness can be easily achieved.

Conventionally, a glass plate has been used as the substrate material that makes up the display part of a liquid crystal display, but with cards that are easily deformed, the display part may be damaged due to cracks in the glass, so it is difficult to use a glass plate like a plastic film or sheet. Since a flexible substrate is more durable, it is desirable to use a plastic substrate for such uses.

Next, an example of the structure of a card according to the present invention is shown in FIGS. 1 and 2. (1) is a liquid crystal display with a memory effect, and (
2) is a card, (3) is a lead terminal portion, and (5) is a plastic plate that provides appropriate rigidity to the display and protects the display. The plastic plate that protects the display body is a one-piece molded product or #:! It is made by laminating and adhering I films. Furthermore, the display section is filled with smectic liquid crystal to provide memory properties.

Next, the principle of operation of the product of the present invention will be explained.

Some liquid d1□ materials have positive antistatic anisotropy, and as the temperature increases, the solid-smectic phase-nematic 4[1-
・Many materials are known to transform into isotropic liquids.

This liquid crystal is sandwiched between two electrode substrates coated with conductive films to form a display. When a current is applied to one of the conductive films, the generated Joule heat changes the smectic phase to liquid crystal isotropy, and then when the current is turned off, the temperature drops and the transition changes from isotropic-nematic phase to smectic phase. and changes. The nematic phase generated here has a lower viscosity than the smectic phase, so when a voltage higher than the threshold is applied between the two electrodes, the long axis of the molecule is easily parallel to the electric field direction.
That is, when the material enters a homeotropic alignment state, the temperature decreases, and the state becomes a smectic phase, that state is memorized and the display state becomes a transparent state with less light scattering. On the other hand, when the temperature is lowered to the smectic phase without applying an electric field to the nematic phase, the molecular axes of the liquid crystal become disordered and in a random state, resulting in a state in which light is strongly scattered. Therefore, when displaying, necessary display can be achieved by appropriately selecting the electrode portions to which a voltage is applied and the portions to which no voltage is applied after heating and raising the temperature. Further, when a dichroic dye is added to the liquid crystal, the liquid crystal becomes a non-colored state in the non-meotropic state and a colored state in the random state, and the same contrast as described above can be obtained.

Therefore, the display of the present invention requires means for applying a voltage across the liquid crystal layer and means for heating the liquid crystal layer.

Next, a method for writing display contents using laser light will be explained. As for the cell structure, as in the above example, the liquid crystal layer sandwiched between two electrodes is once made isotropic by a heating electrode, and then a voltage is applied to the entire display section to lower the temperature. A homeotropic state is formed throughout the display section, resulting in a transparent smectic state.

When information is written by heating with a laser beam after the electric field is turned off, only that portion becomes randomly oriented, scattering light and storing the necessary information.

Next, embodiments according to the present invention will be described.

Icoof aluminum was formed on a 100 μm thick polyester film by EB vapor deposition to serve as a heating electrode.

On the other hand, a transparent electrode of indium oxide was formed on a 100 μm polyester film. These two electrodes are heat-pressed using a urethane sealant to form a cell, and inside is blue dichroic dye C! LD-506,0LD-508
- (manufactured by Sumitomo Chemical) added 0.5% of 4-cyano-
Filled with 4-octylbiphenyl liquid crystal. A of this cell
As the lead terminals of the electrodes, take out the lead parts 2 and 1 from each of them to the outside of the cell, and connect this!
: (After heat sealing made by Nippon Tenzu Co., Ltd. is heat-pressed to the seam part, several polyester films are laminated with cells in between:
17, an opening was provided in a part of the outer surface so that the leads could come out, and the conductive part of the heat seal was exposed to form a card.

The heating aluminum electrode of this is connected to a temperature higher than the isotropic temperature of the liquid crystal (4
1℃), a current that can heat the entire cell is applied to make it isotropic, and immediately after that, between the A'l electrode and the
When an alternating voltage of 100 Hz was applied and the display was allowed to cool, the entire display surface became transparent. In this liquid crystal layer, the transition temperature from solid to smectic was 21.5°C, 33.5°C from smectic to nematic, and 40.5°C from nematic to isotropic liquid. Next, turn off the voltage and Ar −
When the alphabet was written on the display surface by scanning with Hθ laser light, the area irradiated with the laser light was heated to an isotropic liquid state, and when the writing was completed, the alphabet was displayed in blue. Even if this was left at 25°C for more than a month, this display did not disappear.

Next, another embodiment according to the present invention will be described. Similar to the previous example, two-type electrodes are formed on the polyester film. After that, the Al electrodes were used as row electrodes and also as 1:n
The 203 electrodes are etched in stripes to form column electrodes, forming display elements as before. At this time,
Eight row electrodes and 48 column electrodes were formed so that eight 5×7 dot characters including a decimal point could be displayed. The number of leads was 56 in total.

Applying a heating current pulse to the upper part of this aluminum electrode,
At the next moment, a voltage was applied between this aluminum plate and the column electrode of the 120g machine, and when a similar signal was applied to the eight row electrodes in sequence, the necessary display area was transparent.
The background is displayed in blue. Memory properties were the same as above.

Next, when the display card described above was subjected to a repeated bending test of 150 mmH 100 times, no display defects were found.

As shown in the above embodiments, the present invention has a small number of parts,
Because it has excellent durability and memory properties, it is expected to be useful in applications such as cash cards.

In addition, in the present invention, 4-cyano-4' is used as the liquid crystal.
Although octylbifenyl alone was used, it is not limited to this compound, and any compound that undergoes a phase change from solid-smectic phase to nematic phase to isotropic may be used alone or as a mixture.

Furthermore, in the present invention, polyester is used as the material for forming the film or the card by lamination, but vinyl chloride, acrylic, polysalone, polyethersulfone urethane, cellulose, fluoride, etc., or a composite thereof may also be used. It's okay.

Further, this card may be appropriately processed, such as a stamp or a magnetic tape, depending on the purpose of its use.

In addition, the lead terminal section is not limited to one that is directly connected to the terminal of the display body and exposed on the card surface, but also has an IC chip, etc. built-in, and the lead terminal section is not limited to one that is directly connected to the terminal of the display body and is not limited to one that is exposed on the surface of the card. The display body may be configured not to operate even when a voltage is applied, and a slide mechanism may be provided such that the lead terminals are exposed only when the card is placed in the machine.

In addition, various displays such as the display of deposited or paid-out amounts can be made by using a liquid crystal display that temporarily stores and displays, an electrochromic display, etc.

[Brief explanation of the drawing]

Figure 1 shows a front view of an example in which the display body is incorporated into a card. Figure 2 is a cross-sectional diagram of the card (1) is the display section;
(2) is the force, the negative case part, and (3) is the lead terminal part. child / ) gA child 2 river

Claims (1)

[Scope of Claims] (1) A card that has only a liquid crystal display section without itself having a power supply or drive circuit, the display section has a memory function, and a part of the card has a memory function for driving the display section. A memory card featuring a lead terminal section. (2) The card according to claim 1, wherein the display portion having a memory function uses liquid crystal that has a smectic phase in the operating temperature range. (8) The card according to claim 1 or claim 2, wherein the substrate material forming the liquid crystal display section is made of a plastic film coated with a conductive armpit.