JP2590752Y2 - Transparent tablet - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a transparent tablet.

2. Description of the Related Art Recently, microcomputers have been used for various devices, and the devices are equipped with a tablet (also referred to as a touch switch, a touch panel, and a flat switch) as an information input unit and a display as an output unit. Have been. Tablets include a transparent tablet mounted on a display in addition to a conventional keyboard.

[0003] Transparent tablets can be input by pressing the surface of the tablet with a finger or a pen while looking at the display screen, so that the input operation is simple, and the display and tablet can be integrated to save space. , Usage is increasing.

In a transparent tablet, two transparent electrode substrates A and B each having at least one surface provided with a transparent conductive film are arranged so that the transparent conductive films face each other, and an external force is applied to the transparent electrode substrate. Only in the transparent electrode substrate A,
The transparent conductive films on B are in contact with each other and operate as a switch. For example, menu selection on a display screen or input of a figure can be performed.

[0005]

2. Description of the Related Art FIG. 1 shows a configuration example of a conventional transparent tablet. However, in this figure, only a part of the configuration is shown for simplicity. In an actual tablet, a plurality of transparent conductive films and circuits are provided on each of the transparent electrode substrates A and B, and a corresponding number of contact terminal portions are provided. Is provided on the substrate C (the same applies to the following drawings).

Since the contact terminals are often provided on one side of the substrate C (for example, on the upper surface of the tablet), the transparent conductive films 1 and 5 on the substrates A and B each have the substrate C in the middle. To the other side. The transparent conductive film 1 on the upper substrate A is electrically connected to the contact terminal portion 4 through the circuit 2 and the anisotropic conductive film 3. On the other hand, the transparent conductive film 5 on the lower substrate B is first electrically connected to the circuit 8 provided on the lower side of the substrate C through the circuit 6 and the anisotropic conductive film 7 and then provided on the substrate C. Through the holes 9 (so-called through-holes) provided, they are electrically connected to the contact terminal portions 10 provided on the upper side of the substrate C. This through-hole method is difficult to manufacture and has a problem in reliability.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is intended to establish an electrical connection between a contact terminal portion of a substrate C and a transparent conductive film on a substrate on a side opposite to a surface on which the terminal portion is provided. It is an object of the present invention to provide a tablet which is easy to manufacture and has improved reliability by performing without using a through-hole method. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows an embodiment of the present invention. The transparent conductive film 1 on the upper substrate A is electrically connected to the contact terminal portion 4 through the circuit 2 and the anisotropic conductive film 3. On the other hand, the transparent conductive film 5 on the lower substrate B is a circuit 6, an (anisotropic) conductive film 7
Is electrically connected to the circuit 11 of the upper substrate A through the conductive layer 12, and is electrically connected to the contact terminal portion 10 through the (anisotropic) conductive film 12, so that a through-hole is not required and the manufacturing is simple. , Reliability is also improved. Circuit and board on board A
Electrical connections 7 and 14 with circuits on B, on board A or B
Electrical connections 3 and 12 between the circuit of FIG.
Independent.

Another embodiment of the present invention is shown in FIG. In this embodiment, a contact terminal portion is provided below the substrate C.
The transparent conductive film 5 on the lower substrate B is a circuit 6, (anisotropic)
It is electrically connected to the contact terminal portion 10 through the conductive film 7. On the other hand, the transparent conductive film 1 on the upper substrate A is a circuit 2,
Circuit 13 on lower substrate B through (anisotropic) conductive film 3
After being electrically connected to the contact terminal portion 4 through the (anisotropic) conductive film 14, no through hole is required. Further, in this embodiment, since the connection portions of the (anisotropic) conductive film are arranged in a line, the connection portion of the (anisotropic) conductive film can be formed in one step, so that the manufacturing is further simplified and the reliability is improved. The performance is also improved. Here, the anisotropic conductive film means
Conductive particles (gold-plated nickel, etc.) are dispersed in a resin that develops adhesiveness when heat and pressure are applied. And the substrates adhere to each other.

In this embodiment, the circuits are connected by an anisotropic conductive film, but heat and pressure are applied.
An adhesive layer made of a resin that exhibits adhesive properties
The circuit part and the non-circuit part of the connection part on one of the substrates
The adhesive layer is thin and non-
Make the structure thicker at the road, and apply heat and pressure to the connection.
By adding, the circuit is made conductive and the circuit and the board
You may bond each other. Or apply heat and pressure
The conductive particles are dispersed in a resin that exhibits
Circuit on one of the substrates using
And apply heat and pressure to the connections to connect the circuits.
Threading and bonding may be performed simultaneously. Manufacturability and reliability
An anisotropic conductive film is preferably used in terms of properties.

The circuit is formed using a material in which one or more kinds of conductive particles (silver, gold, copper, graphite, ITO, or the like) are dispersed in a resin , a metal film, a metal foil, or the like.
However, a configuration in which these materials are stacked may be adopted .

As the transparent conductive film, a sputtering method,
An ITO film formed by a PVD method such as a vacuum evaporation method or an ion plating method, a coating method, a printing method, or the like is preferably used.

Of the substrates A and B, the substrate to which an external force is applied to operate as a switch needs to be flexible. Film, polysulfone film, polyarylate film, etc. and thickness 200-400μ
m glass plate or the like is preferably used. The material of the substrate on the other side is not particularly limited. The substrate C is preferably flexible in connecting to an external circuit. As the substrate material, a polyester film, a polyimide film,
A polyarylate film or the like is preferably used.

Further, the present invention is not limited to the matrix type transparent tablet shown in the embodiment, but can be applied to an analog type transparent tablet.

[Brief description of the drawings]

FIG. 1 is a view for explaining an outline of a conventional transparent tablet.

FIG. 2 is a diagram for explaining the outline of the transparent tablet of the present invention.

FIG. 3 is a schematic diagram illustrating another type of transparent tablet according to the present invention; In each drawing, a plan view and a cross-sectional view taken along lines a , b or a, b, c are shown from above.

[Explanation of symbols]

 1,5 transparent conductive film 2,6,8,11,13 circuit 3,7,12,14 anisotropic conductive film 4,10 contact terminal 9 through hole

Claims (1)

(57) [Scope of request for utility model registration] 1. Two transparent electrode substrates A and B having at least one surface provided with a transparent conductive film are arranged so that the transparent conductive films face each other.
Separately, there is a substrate C provided with a contact terminal portion with an external circuit, and the transparent conductive films on the transparent electrode substrates A and B contact each other only at a portion where external force is applied to the transparent electrode substrate to operate as a switch. In the transparent tablet, a circuit provided on the substrate A by being electrically connected to the transparent conductive film on one of the substrates A is electrically connected to a circuit provided on the other substrate B. By electrically connecting the circuit on the substrate B and the circuit provided on the substrate C, the transparent conductive film on the substrate A is electrically connected to the contact terminal portion with the external circuit through the circuit on the substrate B. To the circuit on board A and board B
Electrical connection with the upper circuit, the circuit on substrate A or B
A transparent tablet , wherein electrical connections to circuits on board C are independent of each other .