KR100683655B1 - Smart card - Google Patents

Abstract

The present invention provides a smart card having a front panel, a circuit board having an input unit for inputting information and a display unit for displaying information, and a frame supporting the circuit board. The display unit of the circuit board, the upper, lower plastic substrate; An electrode and an alignment layer sequentially formed on the rear surface of the upper plastic substrate and the front surface of the lower plastic substrate; A front polarizer formed on a front surface of the upper plastic substrate; A liquid crystal layer interposed between the alignment film of the upper plastic substrate and the alignment film of the lower plastic substrate; And a reflecting plate and a lower polarizing plate sequentially formed on a rear surface of the lower plastic substrate, wherein the lower plastic substrate of the reflective plastic liquid crystal display device is integrally formed with a part of the circuit board. It is done. The smart card of the present invention uses a reflective plastic liquid crystal display device as a display unit and PPTA having excellent heat resistance as a plastic substrate material, so that a separate intermediate layer is not required between the reflective plate and the lower plastic substrate. The lower plastic substrate of the liquid crystal display device is replaced by a part of the circuit board on which the liquid crystal display device is mounted, and the reflective plate and the polarizing plate of the liquid crystal display device are attached to the attachment surface of the frame supporting the circuit board. The thickness of the smart card becomes thinner by the thickness. In addition, the smart card of the present invention has a smaller power consumption and is easier to manufacture than the case where the transmissive liquid crystal display device is mounted.

Description

Smart card {Smart card}

Figure 1a is a schematic perspective view showing the configuration of a smart card equipped with a conventional liquid crystal display device,

FIG. 1B is a cross-sectional view of a portion of the liquid crystal display device mounted on the smart card of FIG. 1A;

2 is a perspective view schematically showing the configuration of a smart card equipped with a reflective plastic liquid crystal display device according to the present invention;

3A is a cross-sectional view of a reflective plastic liquid crystal display device cut in the smart card of FIG. 2;

3B is a cross-sectional view of the frame attached with the reflector and the lower polarizer in the smart card of FIG. 2.

<Brief description of the major symbols in the drawings>

31 .. Circuit Board 32 ... Frame

33. Reflective plastic LCD

The present invention relates to a smart card, and in more detail, power consumption is reduced, a separate backlight light source is unnecessary, and it is difficult to carry it with a reduction in overall thickness by replacing a part of a circuit board of a smart card with a lower board of a liquid crystal display. It relates to a smart card equipped with a convenient reflective plastic liquid crystal display device.

The smart card refers to a card having an integrated circuit chip therein, for example, an electronic identification card by inputting personal information such as an address, a name, a social security number, a driver's license number, a medical insurance number, and the like into an integrated circuit chip. It may be used as an electronic money that allows payment by inputting information corresponding to the corresponding amount into a chip by depositing at a bank or inquiring and subtracting deposit information instead of cash at a store. Electronic money is like invisible cash and can be traded on the Internet, online or between individuals. Electronic money does not need to carry cash and is expected to be a new payment method in the future because it can be used more conveniently than a credit card.

Recently, various cards such as credit cards and telephone cards are also being integrated into smart cards. The smart card further includes a power supply, an image display means, and a function switch, so that the contents input into the smart card itself can be inquired without the reader of the smart card.

1A shows a perspective view of a typical smart card having such characteristics.

Referring to this, the smart card 10 and the circuit board 11, the frame 17 is attached to the back of the circuit board 11 to support the circuit board (11). It is formed by bringing each of the front panel 16, which has an opening for use as a window of a component mounted on the circuit board, into close contact with each other.

In general, the circuit board 11 includes a liquid crystal display device 12 for displaying an image, a solar cell 13 for supplying driving power to the smart card, and a change in image display of the liquid crystal display device 12. Components such as the function switches 14 and the integrated circuit 15 connected to each other through wirings are mounted.

The liquid crystal display device 12, the solar cell 13, the function switch 14, and the integrated circuits 15 are external to the smart card 10 through a window 16b formed in the front panel 16. Exposed. Each of the components is mounted on the front surface of the circuit board 11 in which circuit wiring of a predetermined pattern is formed.

FIG. 1B is a cross-sectional view taken along the line II-II 'of FIG. 1A, which is a cross-sectional view of a portion of a liquid crystal display element mounted on a circuit board.

Referring to FIG. 1B, the liquid crystal display 12 may be disposed to face each other, and the upper substrate 12a and the lower substrate 12a 'may be made of a transparent material, and the upper substrate 12a and the lower substrate 12a' may be formed. The upper electrode 12b and the lower electrode 12b 'formed in a predetermined matrix type on the surfaces facing each other, and the upper alignment layer 12c and the lower alignment layer 12c formed in the upper electrode 12b and the lower electrode 12b'. '), A sealing member 12e having a closed space and a liquid crystal injection hole (not shown) formed on the edges of the upper substrate 12a and the lower substrate 12a' and sealing them to form a liquid crystal injection hole, and the upper substrate. And an upper polarizing plate 12f and a lower polarizing plate 12f 'attached to the outer surface of the lower substrate 12a' and 12a '.

However, the smart card 10 has a problem in that the liquid crystal display device 12 mounted on the circuit board 11 has a large power consumption and is inconvenient to carry since a backlight light source must be mounted.

The technical problem to be solved by the present invention is to solve the above problems, the power consumption is reduced, the backlight light source is unnecessary, and by replacing a part of the circuit board of the smart card with the lower substrate of the liquid crystal display device, it is easy to carry by reducing the overall thickness To provide a smart card.

In the present invention, a smart card comprising a front panel, a circuit board having an input unit for inputting information and a display unit for displaying information, and a frame supporting the circuit board,

The display unit of the circuit board,

Upper and lower plastic substrates; An electrode and an alignment layer sequentially formed on the rear surface of the upper plastic substrate and the front surface of the lower plastic substrate; A front polarizer formed on a front surface of the upper plastic substrate; A liquid crystal layer interposed between the alignment film of the upper plastic substrate and the alignment film of the lower plastic substrate; And a reflecting plate and a lower polarizing plate sequentially formed on a rear surface of the lower plastic substrate, wherein the lower plastic substrate of the reflective plastic liquid crystal display device is integrally formed with a part of the circuit board. It provides a smart card characterized by.

The upper and lower plastic substrates of the reflective plastic liquid crystal display device obtain a metallized poly-p-phenylene terephthalamide (PPTA) containing solution of Chemical Formula 1, and inject the solution into a molding machine. The result is molded through reduction reaction by adding proton source.

<Formula 1>

In said formula, n is an integer of 30-200. The weight average molecular weight of the PPTA is preferably 10,000 to 50,000.

In the reflective plastic liquid crystal display device, a red, green, and blue color filter layer may be further formed between the lower plastic substrate and the electrode layer. In addition, the frame is formed with an attached surface having a part of the thickness removed so that the reflecting plate and the lower polarizing plate may be installed on the side opposite to the circuit board.

The present invention uses a reflective plastic liquid crystal display device as a display portion of a smart card, and replaces a part of the circuit board on which the liquid crystal display device is mounted with the lower plastic substrate of the liquid crystal display device. At this time, in the reflective plastic liquid crystal display device, the plastic substrate is a metallized poly-p-phenylene terephthalamide (poly-p-phenyleneterephthalamide: PPTA) containing a solution containing a molding machine After injection, it is the molding product obtained through reduction with a proton source such as water.

<Formula 1>

Originally, PPTA had no solvent to dissolve it except sulfuric acid. Therefore, molding with a plastic substrate using it is practically impossible. Accordingly, in the present invention, PPTA is reacted with sodium hydride (NaH) and dimethyl sulfoxide to obtain a metallized poly-p-phenyleneterephthalamide (PPTA) containing solution, which is injected into a molding machine, and then water The molding is carried out as desired by adding a proton source such as the like and carrying out a reduction reaction. According to this method, since PPTA is easy to be molded, it can be processed into a plastic substrate or the like, and since the glass transition temperature of PPTA is 300 ° C. or higher, it is excellent in heat resistance. Phosphorus Al film can be directly formed into a film without interposing a separate intermediate layer.

In this way, the intermediate layer formed between the plastic substrate and the reflecting plate can be omitted, and since it is a reflective type, a backlight light source is unnecessary. In addition, since a part of the circuit board is used as the lower plastic substrate of the reflective plastic liquid crystal display device, the overall thickness of the smart card is reduced.

Hereinafter, the present invention will be described in detail through one preferred embodiment of the present invention.

Figure 2 shows a schematic exploded perspective view of a smart card according to the present invention.

Referring to this, the front surface of the circuit board 31 is a reflective plastic liquid crystal display device 33 for displaying an image, a solar cell 35 and a liquid crystal display device 33 for supplying driving power for the smart card 30. The function switches 36 for changing the image display of the &quot;) and components such as the integrated circuit 37 connected to each other through wirings are mounted. In order to protect the front surface on which the components of the circuit board 21 are mounted, the front panel 38, which is an exterior of the smart card 20, is closely attached to the front surface of the circuit board 31.

A window 38b having an opening formed therein is formed on the front surface of the front panel 38. The reflective plastic liquid crystal display 33, the solar cell 35, the function switch 36, and the integrated circuit 37 are exposed to the outside of the smart card 30 through the window 38b.

The frame 32 supporting the circuit board 31 is provided on the back of the circuit board 31.

3A is a cross-sectional view taken along line IV-IV 'of FIG. 3.                     

Referring to this, the reflective liquid crystal display elements are installed to face each other, and the upper plastic substrate 33g and the lower plastic substrate 31 'made of a transparent material and the surfaces of the substrate 33g and 31' facing each other. An upper electrode 33e and a lower electrode 33a formed in a predetermined matrix type on the upper electrode 33b and an upper alignment layer 33f and a lower alignment layer 33b formed on the electrodes, respectively, and are applied to edges of the upper and lower substrates. A sealing member 33c having a closed space in which liquid crystal is injected by sealing and a liquid crystal injection hole (not shown), and an upper polarizing plate 33h and a lower polarizing plate (not shown) attached to outer surfaces of the upper and lower substrates. It is configured by. Although not shown in FIG. 3A, a red, green and blue color filter layer may be further formed between the lower plastic substrate 31 ′ and the lower electrode 33 a.

3B is a cross-sectional view of the frame 32 to which the reflecting plate 34 and the lower polarizing plate 33h 'are attached in the smart card of FIG. 2.

Referring to this, the position of the mounting surface of the reflective plate 34 and the lower polarizing plate 33h 'of the reflective plastic liquid crystal display device is matched with the corresponding surface of the lower plastic substrate of the liquid crystal display device formed on the circuit board 31'. . Thus, the frame 32 is scraped off so that the reflecting plate and the lower polarizing plate can be inserted in consideration of the area and thickness of the reflecting plate and the lower polarizing plate. The reflective plate 34 and the lower polarizing plate 33h are attached to the attachment surface 32b thus formed. Therefore, it is preferable that the depth of the attaching surface 32b matches the thicknesses of the reflecting plate 34 and the lower polarizing plate 33h.

 As can be seen from Figs. 3A and 3B, a reflecting plate 34 is mounted between the lower polarizing plate 33h 'and the lower plastic substrate and the circuit board 31'. Here, the reflector plate 34 is an Al film, which can be formed by directly depositing aluminum on the lower plastic substrate 31 '. The lower plastic substrate 31 ′ is also used as a substrate of the plastic liquid crystal display, but is a part of the circuit board 31 of FIG. 2.

A red, green, and blue color filter layer (not shown) may be further formed between the upper plastic substrate 33g and the upper electrode 33e.

The plastic substrates 33g and 31 'of the present invention supply a metallized poly-p-phenyleneterephthalamide (PPTA) containing solution of formula 1 to a molding machine, which is reduced with a proton source such as water It is obtained by making it react, and it is preferable that the thickness is 0.1-0.4 micrometer.

<Formula 1>

In said formula, n is an integer of 30-200.

In the metallized PPTA of Formula 1, substitution degree replaced with sodium (Na) instead of hydrogen (H) is preferably 80% or more.

In the smart card according to the present invention, a part of the circuit board is used as the substrate of the reflective plastic liquid crystal display device. Therefore, since the total thickness of the lower plastic substrate 31 ', the reflecting plate 34, and the lower polarizing plate 33h' of the liquid crystal display device and the backlight light source are unnecessary, the total thickness of the smart card is reduced. In addition, power consumption is reduced as compared with the case where a transmissive liquid crystal display device is mounted.

The smart card of the present invention uses a reflective plastic liquid crystal display device as a display unit and PPTA having excellent heat resistance as a plastic substrate material, so that a separate intermediate layer is not required between the reflective plate and the lower plastic substrate. The lower plastic substrate of the liquid crystal display device is replaced by a part of the circuit board on which the liquid crystal display device is mounted, and the reflective plate and the polarizing plate of the liquid crystal display device are attached to the attachment surface of the frame supporting the circuit board. The thickness of the smart card becomes thinner by the thickness. In addition, the smart card of the present invention has a smaller power consumption and is easier to manufacture than the case where the transmissive liquid crystal display device is mounted.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is only exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Claims (4)

A smart card comprising a front panel, a circuit board having an input unit for inputting information and a display unit for displaying information, and a frame supporting the circuit board, The display unit of the circuit board, Upper and lower plastic substrates; An electrode and an alignment layer sequentially formed on the rear surface of the upper plastic substrate and the front surface of the lower plastic substrate; A front polarizer formed on a front surface of the upper plastic substrate; A liquid crystal layer interposed between the alignment film of the upper plastic substrate and the alignment film of the lower plastic substrate; And a reflecting plate and a lower polarizing plate sequentially formed on a rear surface of the lower plastic substrate. Upper and lower plastic substrates of the reflective plastic liquid crystal display device, Obtaining a metallized poly-p-phenyleneterephthalamide (PPTA) containing solution of formula (1), injecting the solution into a molding machine, and then adding a proton source to it to form a reduction product. And a lower plastic substrate of the reflective plastic liquid crystal display device is integrally formed with a portion of the circuit board. <Formula 1>

In said formula, n is an integer of 30-200. delete The smart card according to claim 1, wherein a red, green, and blue color filter layer is further formed between the lower plastic substrate and the electrode layer. The smart card according to claim 1, wherein the frame is formed with an attached surface having a part of a thickness thereof removed from the side of the frame such that the reflecting plate and the lower polarizing plate may be installed on a side opposite to the circuit board.

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