JPS61163524A - Transparent membrane touch switch - 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] Technical Field> The present invention relates to a transparent membrane touch switch that is attached to the display surface of a self-luminous display device such as an EL, LED, or CRT, and is used to input coordinate data of the display surface according to the display. Regarding.

<Prior Art> FIGS. 5 and 6 show the configuration of a conventional transparent membrane touch switch, each including a plurality of transparent electrodes 11, 11.
A plurality of transparent spacers 1 are used to maintain a predetermined gap between the upper and lower electrode substrates 12 and 13 formed with -.
4,14. ... is placed.

However, this transparent dot spacer 14.14°~・-
・The transparent Tonto spacer 14.14. −・
-... is clearly visible from the outside, which has the disadvantage of deteriorating the appearance quality of the transparent membrane touch switch.

Moreover, this transparent membrane touch switch has a transparent dot spacer 14. 14. Since the method operates by pressing with - as a fulcrum, stress is generated on the film forming the electrode substrate 12, which causes a decrease in reliability.

<Objective of the Invention> The present invention has been made in view of the above circumstances, and its object is to provide a transparent membrane touch switch that eliminates the conventional transparent tongue spacer.

<Structure of the Invention> In the present invention, in a transparent membrane touch switch attached to the display surface of a self-luminous display device, an anisotropic conductive thermocompression adhesive layer is formed between upper and lower electrode substrates, and this anisotropic conductive thermocompression material layer is formed between upper and lower electrode substrates. It is characterized in that the thickness of the thermocompression bonding material layer is 10 to 20 microns.

<Example> An embodiment of the present invention will be described below.

Figure 3 shows the relationship between the light transmittance and the film thickness of the anisotropic conductive material, and the curve a shows the light transmittance 1 curve and the film thickness of the operating pressure. At 10 microns or less, the increase is rapid, but at 10 microns or more, finger pressure operation is almost possible.In the present invention, we utilize the characteristics of this anisotropic conductive material to replace the conventional transparent tonto spacer in transparent membrane touch switches. Instead, as shown in FIG. 4, a 10 to 20 micron thick layer of anisotropic conductive material 1 is formed between the upper and lower electrode substrates 2.3. Then, when position 2a on the upper substrate 2 is pressed, a resistance change occurs in the anisotropic conductive material layer 1 between the upper electrode 4 and the lower electrode 5, and the resistance between the electrode 4 and the electrode 5 is changed. Resistance value changes. On the other hand, the resistance value of the anisotropic conductive material layer 1 in a direction perpendicular to this pressing direction is infinite.

FIG. 1 shows an exploded structure of a transparent membrane touch switch.A plurality of ITOi3 bright electrodes 4, 4°, . This ITO transparent electrode 4 has, for example, 30
The width of this ITO transparent electrode 4 is, for example, 5.9w.
, the gap between the ITOi3 bright electrodes 4.4 is, for example, 1.0 fl. The lower electrode substrate 3, which is a glass substrate, has a plurality of I
TO transparent electrode 5.5. - and are formed by arranging them in the same direction.

For example, there are 30 ITOi3 bright electrodes 5, and these (7
) The width of the ITO transparent electrode 5 is, for example, 5.0 fi, and the gap between the ITO transparent electrodes 5.5 is, for example, 1.0 m.

The lower electrode substrate 3 further includes ITO transparent electrodes 5°5,
- For example, an anisotropic conductive thermocompression bonding material layer 1 is formed in a planar manner covering 10
It is applied and formed by screen printing to a thickness of microns. As this anisotropic conductive thermocompression bonding material, for example, ADC-3C (Sun Arrow Co., Ltd.) is used.

Then, the ITO transparent electrode 4 and the ITO transparent electrode 5 face each other, and the ITO transparent electrodes 4.4. Arrangement direction of ... and ITO transparent electrode 5.5. The upper electrode substrate 2 and the lower electrode substrate 3 are bonded together so that the arrangement direction of . and integrate.

FIG. 2 shows a cross-sectional structure of a transparent membrane touch panel formed by the above method, in which an anisotropic conductive material layer 1 is formed between an upper electrode substrate 2 and a lower electrode substrate 3. Then, when a desired position on the upper electrode substrate 2 is pressed, the upper and lower electrodes 4.5 at this position become conductive, and the electrodes 4.5 at other parts maintain an insulated state.

In the above embodiment, the upper electrode substrate 2 is formed of a transparent film, and the lower electrode substrate 3 is formed of a glass substrate, but the lower electrode substrate 3 as well as the upper electrode substrate 2 may also be formed of a transparent film.

<Effects of the Invention> As explained above, in the present invention, since an anisotropic conductive thermocompression bonding material layer is formed between the upper and lower electrode substrates, the conventional transparent tongue spacer can be eliminated, and the transparent membrane touch The appearance quality of the switch can be improved. Furthermore, the upper and lower electrode substrates can be brought into close contact with each other, and local stress due to pressure is not generated on the electrode substrates, so reliability is improved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an exploded configuration of an embodiment of the present invention, Fig. 2 is a sectional view of an embodiment of the invention, and Fig. 3 shows the relationship between the film thickness, transmittance, and operating pressure of the anisotropic conductive material. 4 is a partially sectional perspective view of the embodiment of the present invention, FIG. 5 is a perspective view of the conventional example, and FIG. 6 is a plan view of the conventional example. 1.-Anisotropic conductive thermocompression bonding material layer

Claims (2)

[Claims] (1) In a transparent membrane touch switch attached to the display surface of a self-luminous display device, an anisotropic conductive thermocompression bonding material layer is formed between the upper and lower electrode substrates, and the thickness of this anisotropic conductive thermocompression bonding material layer is A transparent membrane touch switch characterized by having a diameter of 10 to 20 microns. (2) The transparent membrane touch switch according to claim 1, wherein either the upper and lower electrode substrates are both made of a transparent film, or one of the upper and lower electrode substrates is made of a glass substrate.