JPH0481290B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention provides a transparent insulating sheet that can be attached to the display section of various display devices and perform input operations based on display commands, etc. The present invention relates to a transparent keyboard switch configured to be provided with a conductive electrode, and particularly relates to an improvement of a transparent keyboard switch devised to improve display visibility of a display device, etc. in such a transparent keyboard switch.

``Prior Art'' This type of transparent keyboard switch has two transparent insulating sheets 1 and 4 made of a suitable material such as plastic film, as its basic structure is conceptually shown in FIG. The sheets 1 and 4 are arranged so as to face each other so as to maintain a required switch operation interval with a spacer 3 in the shape of a transparent dot, and strip-shaped electrodes 2 and 5 made of a transparent conductor are arranged on the opposing surfaces of the two sheets 1 and 4, for example, in the XY direction. Some have a structure in which they are deposited and formed in a matrix-like manner. The transparent keyboard switch having such a structure can be made entirely of a thin film-like, almost transparent material, so it can be placed on the display section 7 of various display devices such as CRT or LDC as shown in the same figure, or otherwise used as appropriate. Once installed, necessary input operations can be performed according to the displayed content on the display section 7.

"Problems to be Solved by the Invention" Although the transparent keyboard switch can have a substantially transparent structure as a whole as described above, in reality, the transparent keyboard switch has a transparent insulating sheet 1, 4 and transparent conductive electrodes 2, 5. Due to the difference in transmittance, the bright and dark areas formed by these constituent members appear non-uniform in a matrix form, which is disadvantageous in that the visibility of the displayed content on the display section 7 is reduced.

On the other hand, according to such a transparent keyboard switch for operation attached to the display section 7, when compared to using such a keyboard switch alone, the electrostatic charge on the keyboard switch associated with input operation is reduced only by this keyboard switch. However, other problems occur, such as a high degree of adverse effect on the signal circuit of the display device and the inhibition of display operation. Therefore, the visibility improvement means unique to this type of transparent keyboard switch is to reduce the electrostatic charge as described above. It is extremely preferable if it also has a suitable accumulation prevention function.

"Means for Solving the Problems" The present invention has been devised by comprehensively considering the above circumstances, and includes a display device on at least one outer surface of a transparent keyboard switch, preferably on its input operation surface. A transparent correction film is provided to improve the visibility of displayed contents. This transparent correction film should be provided to eliminate as much as possible the non-uniformity of brightness caused by the transparent conductor electrode of the transparent keyboard switch. It is preferable to arrange the electrodes in a rectangular or rectangular island shape so as to cover the outside of the formation area where the electrodes are deposited in an arrangement that intersects with the surface. It is possible to sufficiently contribute to improving the visibility in practical use by providing a transparent keyboard switch or by uniformly depositing it on the entire input operation surface of the transparent keyboard switch.

The transparent correction film is preferably formed of the same transparent conductive material as the electrodes, and in this case, in addition to the above-mentioned visibility improvement measures, the conductive transparent correction film may be used as an additional Since it functions effectively as a means for preventing the accumulation of electrostatic charges associated with input operations on the keyboard switch, it is possible to suitably achieve comprehensive functional enhancement of this type of transparent keyboard switch.

Embodiment FIGS. 1 and 2 are diagrams illustrating the formation of a transparent correction film for improving visibility in a transparent keyboard switch constructed according to an embodiment of the present invention. , 1 shows one transparent insulating sheet made of various plastic films used in this type of keyboard switch, and on the back side, as can be seen from Fig. A plurality of electrodes 2 made of the formed transparent conductor are deposited by appropriate means such as etching, vapor deposition, or screen printing. As can be understood from the arrangement relationship in FIGS. 1 and 2, there is a sheet on the surface of this insulating sheet 1 that fills the area outside the area where the electrodes 2 on the back surface are formed, in other words, the space between the electrodes 2. A belt-like or stripe-like transparent correction film 2A is provided on one surface area. The transparent correction film 2A is made of a suitable conductive or non-conductive transparent film material or resin as long as it can make the light transmittance of the entire transparent insulating sheet 1 including each electrode 2 as uniform as possible. It is also possible to apply various other transparent coating materials such as a transparent coating material, but instead of such a method, it is convenient to form and deposit a transparent conductive material equivalent to the electrode 2, and at the same time, this transparent correction coating 2A is a desirable structure since it also provides a suitable means of preventing electrostatic charge accumulation.

As shown in FIG. 3, the transparent insulating sheet 1, which has the electrodes 2 and correction coating 2A as described above separately on the front and back sides, performs the required switch operation via another transparent insulating sheet 4 and a transparent insulating spacer 3. They are arranged facing each other so as to maintain the distance. In the case of this embodiment, the transparent conductor electrodes 5 provided on the transparent insulating sheet 4 side are adhered and formed so as to be orthogonal to the electrodes 2 of the sheet 1 and arranged to cross each other in an XY matrix. In addition, as in the illustrated example, a transparent correction coating 6 is provided on the outer surface of the insulating sheet 4 as a means for improving visibility in the manner described above.
can be equipped with. The spacer 3 for maintaining the switch operation interval may be made of a transparent film material or may be made of a transparent resin material arranged in a dot shape on at least one of the sheets 1 and 4. Although not shown, the conductive transparent correction film may be formed uniformly on the entire upper surface of at least one of the transparent insulating sheets 1, or may be formed on both electrodes, in addition to the above-described method of formation. Means for arranging the two and five relative crossover remaining areas in a rectangular or rectangular shape can also be adopted as appropriate.

According to the transparent keyboard switch equipped with the transparent correction coating 2A or 6 or both of the above configuration,
As shown in Fig. 3, this is mounted on the display unit 7 of a well-known display device such as CRT or LCD, and the necessary input operations are performed while pressing the area corresponding to the display content appearing on the display unit 7. However, in this case, the non-uniformity of brightness caused by both electrodes 2 and 5 is effectively eliminated by the correction coating 2A or 6, so that the visibility of the display section 7 of the keyboard switch can be improved. While this significantly increases input operability, the electrostatic charge that accompanies input operations can be properly grounded through the correction film, so it does not have a negative impact on not only the keyboard switch itself but also the display circuit of the display device. This makes it possible to prevent the possibility of this occurring in advance.

"Effects of the Invention" As is clear from the above description, the transparent keyboard switch according to the present invention improves the visibility of the other party's display device, etc. due to the difference in light transmittance in the transparent constituent members of this type of transparent keyboard switch. Since it is configured to include a transparent correction film provided in a manner to appropriately compensate for the decrease, it is possible to ensure good visibility of the display contents on a display device, etc., and thereby the switch input operability can be greatly improved.
In addition, when adopting a structure in which such a transparent correction film is formed of a conductive material, an electrostatic shield is required to improve the visibility and at the same time suitably prevent the accumulation of electrostatic charge caused by switch operation. It has the additional advantage of being able to easily incorporate functions such as the following, making it ideal for use as a low-cost comprehensive means of improving the functionality of this type of transparent keyboard switch.

[Brief explanation of drawings]

FIGS. 1 and 2 show the arrangement relationship between the transparent conductive electrodes and the transparent correction coating formed on the front and back surfaces of one transparent insulating sheet used in a transparent keyboard switch according to an embodiment of the present invention. A diagram explaining
FIG. 3 is a conceptual enlarged sectional view of essential parts of a transparent keyboard switch according to an embodiment of the present invention including the transparent insulating sheet shown in FIGS. 1 and 2, and FIG. 4 is a conventional example. FIG. 3 is an enlarged cross-sectional configuration diagram of a main part similar to FIG. 3 of the transparent keyboard switch according to the invention. 1, 4... Transparent insulating sheet, 2, 5... Transparent conductor electrode, 3... Transparent insulating spacer, 2A,
6... Transparent correction film, 7... Display section of display device.

Claims (1)

[Scope of Claims] 1. A transparent keyboard switch in which a plurality of electrodes made of a transparent conductor are individually adhered to the opposing surfaces of two transparent insulating sheets arranged oppositely at a required interval so as to intersect with each other. A transparent keyboard switch characterized in that a transparent correction film is provided on the outer surface of at least one of the transparent insulating sheets. 2. A transparent keyboard switch according to claim 1, wherein a transparent correction film is formed on a transparent insulating sheet and is coated outside the corresponding area of the electrode. 3. The transparent keyboard switch according to claim 1, wherein a transparent correction film is applied to the entire outer surface of the transparent insulating sheet. 4. A transparent keyboard switch according to any one of claims 1 to 3, wherein the transparent correction film is made of the same material as the electrodes.