JPH10260395A - Liquid crystal display integrated type transparent touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a screen display very easy to see and to improve its visibility by providing a deflecting plate on the top surface of a movable electrode member and mounting a transparent repeeling sheet entirely on the reverse surface of a fixed electrode member and the top surface of a liquid crystal display. SOLUTION: The deflecting plate 4 which is so processed to have low reflection is provided on the top surface of the movable electrode member 1 of the transparent touch panel, and the transparent repeeling sheet 5 is mounted entirely on the reverse surface of the fixed electrode member 2 of the transparent touch panel and the top surface of the liquid crystal display 6. The said movable electrode member 1 is formed of a movable electrode, a lead wire, etc., on the reverse surface of the a movable-side insulating base material. The said fixed electrode member 2 is formed of a fixed electrode or lead wire on the top surface of a fixed-side insulator material. The deflecting plate 4 functions to transmit and cut off light and is used together with liquid crystal having a switching function for light to serve to add a function as a display. The transparent repeeling sheet 5 is formed of not a coating layer of an adhesive, but a gel sheet, which itself has sticking strength.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transparent touch panel integrated with a liquid crystal display.

[0002]

2. Description of the Related Art Conventionally, the most common structure of a transparent touch panel integrated with a liquid crystal display is such that the lower surface of the fixed electrode member 2 of the transparent touch panel and the upper surface of the liquid crystal display 6 are bonded to each other by an adhesive material 7 such as a double-sided tape. Liquid crystal display 6
There is one in which a polarizing plate 4 is provided on a non-adhesive portion on the upper surface (see FIG. 2).

Further, a configuration has been reported in which the contrast of the screen display is improved by changing the location of the polarizing plate 4 on the upper surface of the movable electrode member 1 of the transparent touch panel (see FIG. 3).

[0004]

However, these types of liquid crystal display-integrated transparent touch panels have the following disadvantages.
Reflection of light on the uppermost surface and air layer 8 between liquid crystal display 6 and lower surface of fixed electrode member 2 of transparent touch panel
Since the transmittance decreases due to the reflection of light at the interface, the screen display is very difficult to see.

[0005] Further, since a shadow is formed on the screen display due to refraction of light in the air layer 8 between the liquid crystal display 6 and the fixed electrode member 2 of the transparent touch panel (see FIG. 4), the screen display is very difficult to see. Met.

Accordingly, an object of the present invention is to solve the above-mentioned problems, and to provide a liquid crystal display-integrated transparent touch panel whose screen display is very easy to see.

[0007]

In order to achieve the above object, a transparent touch panel integrated with a liquid crystal display according to the present invention is provided with a polarizing plate which has been subjected to a low reflection treatment on an upper surface of a movable electrode member of the transparent touch panel. The lower surface of the fixed electrode member and the upper surface of the liquid crystal display were mounted so that the transparent re-peelable sheet was entirely interposed therebetween.

[0008]

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described in detail with reference to FIG.

FIG. 1 is a sectional view showing an embodiment of a transparent touch panel integrated with a liquid crystal display according to the present invention. In the figure, 1 is a movable electrode member, 2 is a fixed electrode member, 3 is a low reflection material, 4 is a polarizing plate, 5 is a transparent removable sheet, and 6 is a liquid crystal display.

In the transparent touch panel integrated with a liquid crystal display according to the present invention, a polarizing plate 4 having a low reflection treatment is provided on the upper surface of the movable electrode member 1 of the transparent touch panel. Is provided with the transparent re-peelable sheet 5 entirely interposed.

The movable electrode member 1 of the transparent touch panel has a movable electrode, a lead wire, and the like formed on the lower surface of a movable insulating substrate. As the material of the movable-side insulating base material, a sheet of polycarbonate, uniaxially stretched polyethylene terephthalate, triacetyl cellulose, polyether sulfone, or the like is used. Materials for the movable electrode include metal oxide films such as tin oxide, indium oxide, antimony oxide, zinc oxide, cadmium oxide, indium tin oxide (ITO), composite films mainly containing these metal oxides, gold,
There are metal films of silver, copper, tin, nickel, aluminum, palladium, and the like. The material of the lead wire is gold, silver,
A conductive paste such as a metal such as copper or nickel or carbon is used.

The fixed electrode member 2 of the transparent touch panel has a structure in which fixed electrodes and lead wires are formed on the upper surface of a fixed insulating substrate. As the material of the fixed-side insulating base material, a sheet or plate of polycarbonate, uniaxially stretched polyethylene terephthalate, triacetyl cellulose, polyether sulfone, glass, or the like is used. The material of the fixed electrode is appropriately selected and used from those described for the movable electrode. As the material of the lead wire, the same material as the lead wire of the movable electrode member 1 is used.

Note that the movable electrode of the movable electrode member 1 and the fixed electrode of the fixed electrode member 2 which are opposed to each other are separated by a spacer, and are pressed from above the movable electrode member 1 with a finger or a pen. For the first time, the movable electrode and the fixed electrode come into contact with each other and input is performed.

The polarizing plate 4 is a device having a function of transmitting and blocking light and passing only polarized light in a certain direction, and is used together with a liquid crystal having a light switching function to serve as a display. It is. The polarizing plate 4 has a general structure in which a polarizing layer is sandwiched by a protective layer of TAC (triacetylcellulose). Depending on the current performance, (1) a high polarization type (PVA-iodine), (2) a standard It can be roughly classified into a type (PVA-iodine type), (3) a highly durable type (PVA-dye type) and the like, and generally (1) and (2) are used. In the present invention, since the upper surface of the polarizing plate 4 is subjected to a low reflection treatment, the reflection of light on the uppermost surface of the liquid crystal display integrated transparent touch panel is suppressed, and the transmittance is finally higher than the structure having an air layer. Become. As a method for processing the low reflection of the polarizing plate 4, the low reflection material 3 is coated on the upper surface of the polarizing plate 4, or a low reflection film is attached. In this case, needless to say, a material having a strength that can withstand an input operation with a pen or a finger is used as the low reflection material 3.

The transparent re-peelable sheet 5 does not consist of a coating layer of an adhesive, but forms a gel sheet, and the gel sheet itself has an adhesive force. Such a transparent removable sheet 5 can be obtained by molding a transparent polymer adhesive into a gel sheet. Examples of the polymer adhesive include urethane, acrylic, and natural polymer materials. Since the refractive index of the transparent removable sheet 5 is larger than that of air and is close to the refractive indexes of a glass plate, a resin plate, a resin sheet used for the transparent touch panel and a glass plate constituting the liquid crystal display 6, the transparent removable sheet 5 is The reflection of light at the interface between the fixed electrode member 2 of the transparent touch panel and the liquid crystal display 6 is suppressed, and finally the transmittance becomes higher than that of the structure having the air layer.

Further, since the refractive index of the transparent removable sheet 5 is close to the refractive indexes of the glass plate, the resin plate, the resin sheet used for the transparent touch panel, and the glass plate constituting the liquid crystal display 6, the transparent removable sheet 5 is used. The refraction of light at the interface between the fixed electrode member 2 of the transparent touch panel and the liquid crystal display 6 is suppressed, and no shadow is formed on the screen display.

Further, the transparent touch panel and the liquid crystal display 6 mounted via the transparent re-peelable sheet 5 are strong against a separating force acting in a vertical direction and a displacing force in a horizontal direction, and are turned from the end. Thus, when they are separated from each other, they are easily separated. Therefore, the transparent touch panel and the liquid crystal display 6 do not have to be separated from each other in a normal use state after mounting, and can be easily separated at the time of maintenance or the like. It goes without saying that the adhesive strength of the transparent re-peelable sheet 5 does not decrease even after repeated detachment. In addition, the transparent removable sheet 5 made of a polymer adhesive serves as a shock absorber due to the elasticity peculiar to the gel, and also serves to protect the liquid crystal display 6 from various impacts and deformations. Furthermore, when using a urethane-based polymer adhesive,
When the transparent touch panel is mounted on the liquid crystal display 6, the transparent removable sheet 5 is mixed between the transparent touch panel or the liquid crystal display 6 and the transparent removable sheet 5 because the transparent removable sheet 5 is a material having both water absorbability and air absorptivity. The transparent re-peelable sheet 5 absorbs the generated air bubbles at room temperature, and finally a bubble-free product can be obtained without special treatment. The special treatment is, for example, a treatment in which the roll is moved while applying pressure from the edge of the surface of the transparent touch panel to expel bubbles. Such special treatment is
It can be applied only when the transparent touch panel is a film, but cannot be applied when the transparent touch panel is a glass. Therefore, in the latter case, the above-described air bubble absorbing action at room temperature becomes extremely useful.

In addition, since the polarizing plate 4 is provided on the uppermost surface,
Each material of the transparent touch panel needs to be optically isotropic. Glass is all optically isotropic,
A normal film may not be optically isotropic (has biaxial anisotropy) in some cases. If it is not optically isotropic,
The outgoing light is colored or darkened like a rainbow.

[0019]

The structure of the transparent touch panel integrated with a liquid crystal display according to the present invention has the above-described structure, and has the following effects.

That is, in the transparent touch panel integrated with a liquid crystal display of the present invention, the conventional air layer is formed by mounting the lower surface of the fixed electrode member of the transparent touch panel and the upper surface of the liquid crystal display entirely through the transparent removable sheet. Since the polarizing plate whose upper surface has been subjected to low-reflection treatment is further disposed on the upper surface of the movable electrode member of the transparent touch panel, the interface between the transparent removable sheet 5 and the fixed electrode member 2 of the transparent touch panel and the liquid crystal display 6 is eliminated. And the reflection of light on the uppermost surface of the transparent touch panel integrated with a liquid crystal display is suppressed. As a result, the transmittance is greatly improved as compared with the conventional product.

Further, in the transparent touch panel integrated with a liquid crystal display of the present invention, the conventional air layer can be formed by mounting the lower surface of the fixed electrode member of the transparent touch panel and the upper surface of the liquid crystal display entirely through a transparent removable sheet. Because of this configuration, the refraction of light at the interface between the transparent removable sheet 5, the fixed electrode member 2 of the transparent touch panel, and the liquid crystal display 6 was suppressed, and no shadow was formed on the screen display.

As a whole, the transparent touch panel integrated with a liquid crystal display of the present invention has an effect that visibility is improved as compared with a conventional product.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a transparent touch panel integrated with a liquid crystal display according to the present invention.

FIG. 2 is a cross-sectional view showing a conventional general liquid crystal display-integrated transparent touch panel.

FIG. 3 is a cross-sectional view showing another conventional transparent touch panel integrated with a liquid crystal display.

FIG. 4 is a diagram showing an image display state of a conventional transparent touch panel integrated with a liquid crystal display.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Movable electrode member 2 Fixed electrode member 3 Low reflection material 4 Polarizing plate 5 Transparent releasable sheet 6 Liquid crystal display 7 Adhesive material 8 Air layer

Claims (1)

[Claims] 1. A low-reflection polarizing plate is provided on an upper surface of a movable electrode member of a transparent touch panel, and a lower surface of a fixed electrode member of the transparent touch panel and an upper surface of a liquid crystal display are entirely mounted via a transparent removable sheet. A transparent touch panel integrated with a liquid crystal display.