JP2001067453A - Ic card with liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an IC card with liquid crystal display device whose display is bright and clear to see by providing the IC card with a transmission-type liquid crystal display part as a display device. SOLUTION: The liquid crystal display part is formed of an upper polarizing plate 1, an upper substrate 2, a liquid crystal layer 3, a lower substrate 4 and a lower polarizing plate 5. A spacer 7 exists in the liquid crystal layer 3 so that a certain space is kept. The liquid crystal display part is fixed to a substrate with IC cart 11 so that a rear side becomes transparent and electrically connected to IC 12, a battery 13, a circuit board 14 and a heat sealing connector 15. In a liquid crystal substrate, a plastic film, that is, a polyester film or a polyvinyl alcohol film is used, for example. The thickness of the liquid crystal display part is designed to be 0.76 mm. The display part is of transmission type and light is made incident from the rear side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of an IC card with a liquid crystal display.

[0002]

2. Description of the Related Art Forgery prevention is achieved by incorporating an IC into a card such as a cash card, a prepaid card, or a commuter pass.
Measures to prevent unauthorized use are being taken and are already in practical use in some areas. Generally, IC card is 54
× 86 × 0.76mm size, IS
The O standard defines the same. Further, a function has been proposed in which a display device is attached to the card so that information in the card can be confirmed. As a conventional technique, an IC card with a display device has been proposed in Japanese Patent Application Laid-Open Nos. 7-85232 and 9-31922, and a resin frame, an information recording medium (IC), a thin battery,
It is composed of a liquid crystal cell and the like. The liquid crystal cell employs a reflection type liquid crystal as shown in FIG. 1, and is characterized by a thin, light and low power consumption because no backlight is required.

However, as shown in FIG. 1, incident light of a reflective liquid crystal passes through an upper polarizing plate 1, an upper substrate 2, a liquid crystal layer 3, a lower substrate 4, and a lower polarizing plate 5, and then is reflected by a reflecting plate 6. There is a problem that the image is very dark because it is reflected and displayed through the same path. Since the incident light has the polarizing plate 1, the light transmission amount is about 40%, the reflectance of the lower polarizing plate 5 is about 30%,
Since the return light attenuation is estimated to be about 10%,
Only about 0% is used for display.

Further, as shown in FIG. 2, when the incident angle of light increases, the lower substrate 4 and the lower polarizer 5 become thicker, so that black display on the liquid crystal (solid line) and reflection on the reflector (dotted line). By 2
Since a superimposed image is formed, the display becomes difficult to see. Further, in the reflection type liquid crystal, the angle at which the reflection intensity is high and the display luminance is the highest is the angle of the regular reflection, but this angle coincides with the angle of the surface reflection of the display panel, making it extremely difficult to see.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an IC card with a liquid crystal display device which has a bright display and is easy to see.

[0006]

A first feature of the present invention is as follows.
In an IC card with a liquid crystal display device having a liquid crystal display device as a display device, a transmission type liquid crystal display device is used. That is, the present invention uses a transmission type liquid crystal display device in an IC card with a liquid crystal display device, so that the amount of light attenuation is smaller than that of a reflection type, there is no double image, and there is no concern about surface reflection. Thus, a bright and easy-to-view display can be obtained.

A second feature of the present invention is that in the first IC card with a transmissive liquid crystal display device, the background is blurred by attaching an embossed film to the back surface of the liquid crystal display device. Therefore, the display has become easier to see. As the film used for the embossing, a transparent synthetic resin film is preferable, and as the embossing means, a stamping roll or a press roll engraved with a pattern (an unevenness of several μm to several tens of μm) usually used for embossing the synthetic resin film. A plate is used.

A third feature of the present invention is that in the first IC card with a transmissive liquid crystal display device, a substantially black-and-white display is possible by attaching a light diffusing plate to the back surface of the liquid crystal display device, and the display is bright and easy to see. Has been obtained. As a light diffusing plate, for example, a transparent synthetic resin film whose surface is roughened with sandpaper to form irregularities of several μm to several tens μm, or a commercially available beam shaping diffuser (LS)
D: trade name) and the like, but a white and bright structure such as ground glass is particularly preferable.

A fourth feature of the present invention is that in the first IC card with a transmissive liquid crystal display device, a display surface is made beautiful by attaching a transmissive color film to the back surface of the liquid crystal display device. And it has improved fashionability. In addition, by using a color film of two or more colors, the display surface becomes beautiful, the fashionability is improved, and the visibility is improved.

A fifth feature of the present invention is that, in the second to fourth IC cards with transmission type liquid crystal display devices, any two or more of the above members provided on the back surface of the liquid crystal display device are used in combination. This makes it possible to take advantage of the respective features of each means, and furthermore, to achieve their synergistic effects. Hereinafter, the configuration of the IC card with a liquid crystal display device of the present invention will be specifically described.

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 shows an IC card with a liquid crystal display device of the present invention, in which a liquid crystal display unit 10 is formed. FIG. 4 is a cross-sectional view of the IC card with a liquid crystal display device of the present invention, and shows a cross section taken along the line AA 'in FIG. As described above, the liquid crystal display section includes the upper polarizer 1, the upper substrate 2, the liquid crystal layer 3, the lower substrate 4, and the lower polarizer 5, and the liquid crystal layer is provided with spacers 7 so as to keep a certain space. Existing. Actually, a transparent electrode and an alignment film exist on each of the liquid crystal layer and the upper and lower substrates, but are omitted here. This liquid crystal display section
It is fixed to the base 11 with the C card so that the back side is transparent,
It is electrically connected to the IC 12 and the battery 13 via the circuit board 14 and the heat seal connector 15. ISO
According to the standard, since the thickness is 0.76 mm, a plastic film is mainly used for the liquid crystal substrate. Although the material of the plastic film is not specified here, there are generally many types such as a polyester film, a polyvinyl alcohol film, a polyarylate film, and the thickness thereof can be freely selected. The thickness of the display unit is designed to be 0.76 mm as described above. In addition, when a laminate structure is used for the mounting method of the IC card, it is necessary to design in consideration of the thickness of the laminate layer. The display portion of the IC card shown in this embodiment is of a transmission type, and light enters from the back side. Compared to the reflection type, it has no light attenuation (about 10%), is bright, is easy to see because no double image is formed, and can be used without worrying about the surface reflection of the display panel.

Embodiment 2 A second embodiment of the present invention will be described. In this embodiment, a structure in which a fine embossed film is attached to the back surface of the transmissive liquid crystal display unit described in the first embodiment is employed.
The embossed surface is a fine uneven surface and has a function of refracting light. Since the background of the transmission type liquid crystal display unit to which this film is adhered is blurred, the display is easy to see.

Embodiment 3 A third embodiment of the present invention will be described. This embodiment has a structure in which a light diffusion plate is attached to the back surface of the transmission type liquid crystal display unit described in the first embodiment. Since the light diffusing plate is a transmissive white plate, substantially black and white display is possible, and light with high contrast is evenly dispersed on the panel surface, so that the display is easy to see.

Embodiment 4 A fourth embodiment of the present invention will be described. This embodiment has a structure in which a transmission type color film is attached to the back surface of the transmission type liquid crystal display section described in the first embodiment. The color of the color film is not specified, and any color may be used.However, if the color is dark, the display will be dark, so select the brightest color possible and choose a film with high light transmittance. Is good. By sticking the color film, the display of the liquid crystal display, which is likely to be inorganic, becomes colorful and the fashionability is improved. If two color films are stuck on top and bottom, left and right, and, for example, the usage amount is displayed in the red part and the balance is displayed in the blue part, the visibility is improved.

Embodiment 5 A fifth embodiment of the present invention will be described. This embodiment has a structure in which any two or more units described in the second to fifth embodiments are combined on the back surface of the transmission type liquid crystal display unit described in the first embodiment. For example, by combining a light diffusing plate and a color film, it is possible to reproduce brighter and more beautiful colors, a film having each function may be separately applied, or two films may be attached to one film. It may have three functions. For example, a color film having light dispersibility can be obtained by coloring a transparent synthetic resin film by dispersing a pigment and forming unevenness by embossing the film surface.

[0016]

[Effect] 1. Claim 1 Since the amount of light attenuation is smaller than that of the reflection type, there is no double image, and there is no concern about surface reflection, so that a bright and easy-to-view IC card with a liquid crystal display device can be obtained. 2. 2. An IC with a liquid crystal display device, in which an embossed film has an effect of blurring the background, so that the display is easy to see.
You get a card. 3. Claim 3 I with a liquid crystal display device which is capable of monochrome display and is bright and easy to see.
C card is obtained. 4. (4) An IC card with a liquid crystal display device having a clean display surface and improved fashionability can be obtained. 5. Claim 5 An IC card with a liquid crystal display device with a clean display surface and improved visibility can be obtained. 6. According to a sixth aspect of the present invention, an IC card with a liquid crystal display device having an effect based on at least the respective requirements can be obtained by employing a combination of the requirements of the second to fifth aspects.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a reflection type liquid crystal.

FIG. 2 is a schematic cross-sectional view of a reflective liquid crystal showing a state where a double image is formed.

FIG. 3 is a schematic plan view of an IC card with a liquid crystal display device of the present invention.

FIG. 4 is a schematic sectional view of an IC card with a liquid crystal display device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper polarizing plate 2 Upper substrate 3 Liquid crystal layer 4 Lower substrate 5 Lower polarizing plate 6 Reflector 7 Spacer 9 IC card 10 Display part 11 Card base 12 IC 13 Battery 14 Circuit board 15 Heat seal connector

Claims (6)

[Claims] 1. An IC card with a liquid crystal display device, comprising a transmission type liquid crystal display portion as a display device. 2. The IC card according to claim 1, wherein a film whose surface is finely embossed is provided on the back side of the transmission type liquid crystal display unit. 3. The IC card according to claim 1, wherein a light diffusion plate is provided on the back side of the transmission type liquid crystal display. 4. The IC card according to claim 1, wherein a transmission type color film is provided on the back side of the transmission type liquid crystal display unit. 5. A transmissive liquid crystal display, a transmissive 2
2. The IC card according to claim 1, wherein a color film having a color or more is provided. 6. The IC card according to claim 2, wherein at least two or more of the members provided on the back surface of the liquid crystal display unit are combined.