JPS6354620A - Capacitance type coordinate detector - Google Patents

Abstract

PURPOSE:To prevent a wrong input operation by applying a high polymer non- dielectric film onto a conductor of a lead-wire wiring for connecting a connector to be connected to a detecting circuit, and a detecting electrode. CONSTITUTION:The titled device is provided with plural detecting electrodes 2 which are placed adjacently in accordance with a coordinate position to be detected, on a film substrate 1, and also, senses a touch of a finger, etc. by covering the surface of the detecting electrode 2 with a high polymer dielectric film 3, for instance, a transparent resin or ink, and bringing a pair of the detecting electrodes to capacitance coupling. By applying a high polymer non- dielectric 4 to the upper part of a conductive layer of a non-detecting part, the input from the non-detecting part is prevented. In such a way, even if many lead electrode parts are brought to wiring in a lump, the sensitivity is good, and also, a capacitance type coordinate detecting device which causes no malfunction is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coordinate detection device that detects a position designated by an operator as a change in capacitance.

More specifically, it relates to an improvement in the structure of a touch detection device that detects a plurality of touch detection electrodes arranged corresponding to coordinate positions to be detected and changes in capacitance of the detection electrodes. [Technology and Problems] In a device that uses capacitance to detect a specified position, the touch point that is indicated by the human body, etc. only needs to be an electric kettle, and it is not possible to use a mechanical device such as a conventionally well-known key switch. Since no contact points are required, it is possible to easily make the detection panel transparent using an electrically conductive substrate on which a transparent conductive thin film is deposited.

Therefore, in combination with display devices and the like, it has attracted attention in recent years as an information input means.

That is, a transparent position detection panel is installed in front of the display surface of the display device, and desired information is input by pointing a contact portion on the panel corresponding to the display position of the information.

A capacitive coordinate detection panel used in such a coordinate detection device is shown in FIG. 11 and FIG. 2.

That is, FIG. 1 is a top view of the main parts showing the structure of a capacitive coordinate detection panel. Figure-2 is A'' in Figure-1.
It is an A' sectional view. In Figure 2, (1) is, for example,
Conventionally, the glass substrate is a glass substrate, on which detection electrodes are arranged in a matrix, and these detection electrodes (2) are connected to a detection circuit by a thin conductor. The surface of each detection electrode is formed of a dielectric film.1 Usually, a pair of detection electrodes is made of a dielectric film.
They are coupled with a certain small amount of capacitance. By touching the middle part of the pair of detection electrodes with a finger, the capacitance of the finger is added to the capacitance between the detection electrodes, causing a change in the capacitance between the detection electrodes. . By the way, in a capacitive coordinate detection panel with such a structure.

If the surface of the thin conductor that connects the detection electrode and the detection circuit is touched with a finger, it will be detected in the same way as if the detection electrode section is touched, resulting in a malfunction.

Conventionally, you should not enter anything other than the input section.

Layering thick insulating boards allows input only to the input section.

It is customary to provide a through hole only in the input section. However, this poses a problem in terms of appearance, and the highly sensitive detection device often malfunctions. This malfunction has been a major problem with capacitance sensing type position detection devices.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned points, and it is an object of the present invention to provide a touch-type history mark detection panel that is capable of stable position detection without deteriorating its appearance and without malfunction.

[Structure of the invention]

The touch-type coordinate detection panel according to the present invention includes a plurality of detection electrodes arranged adjacently on a film substrate corresponding to the coordinate positions to be detected, and furthermore, the detection electrodes ff1fi surface is covered with a polymeric electric film 1, for example, a transparent film. A pair of detection electrodes are coated with resin or ink and capacitance-coupled to detect touch by a finger or the like. The coordinate detection panel having this configuration is characterized in that input from the non-detection portion is prevented by applying a non-dielectric polymer material on the top of the conductive layer in the non-detection portion.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to one drawing.

FIG. 1 is a top view of essential parts showing the structure of an example of a touch-type seat search panel according to the present invention. FIG. 2 is a sectional view taken along line A-A' in FIG. As shown in both figures, indium tin φ oxide (■To) is applied to the film substrate from 200 to
A 300X vaporized N I, T4 T film (manufactured by Daicel Chemical; trade name: CEREC) is etched to form a pair of detection electrodes. Acrylic resin of 1 to Q, 3 zm (manufactured by Inu Nippon Ink; trade name R-1330) was applied by a silk screen method or the like.

Further, a fluororesin (manufactured by Asahi Kasei Industries, Ltd.; Lumiflon) was similarly applied for 0.1 to 0.3 to a thin conductive lead electrode between the detection electrode and the detection circuit. A detection circuit having a pulse oscillation circuit and a frequency-voltage conversion circuit was connected to this detection electrode to confirm its operation, and changes in the output voltage could be confirmed by lightly touching the surface of the detection electrode with a finger. Furthermore, I strongly touched the lead-out wiring part with my finger, but there was no change in the output voltage (.

No malfunctions were observed.

A concrete example of the operation when the circuit shown in FIG. 1 is operated is shown below. 26 from the pulse oscillation circuit without touching the electric kettle with your finger.
．． 4 KE (Z pulse was oscillated. At this time, the frequency -
The output of the voltage conversion circuit was 14V.

Next, when your finger is welded to the detection electrode, the pulse oscillation circuit becomes 7
．． It oscillated at a frequency of 0 KHz. The output of the frequency-voltage conversion circuit at this time was approximately 7V. Next, I pressed the top of the lead (output wiring part) strongly with my finger, but the output from the pulse oscillation circuit did not change at 26.4 KHz, and the output voltage did not change at all at 14V.

Next, in the same manner, a conductive film (manufactured by Daicel Chemical; trade name: CEREC) was etched into a comb-shaped electrode. P-13, 30) was applied. Zero fluorine-based grease (Fluorocoat manufactured by Asahi Kasei Industries) is applied to the lead electric kettle part.
．． 1 to Q, coated at a thickness of 3 mm. The detection circuit described above is connected to this detection electrode and the lead electrode section is pressed with a finger in the same manner.

The excavation pulse frequency and its output voltage do not change at all,
It was confirmed that input from parts other than the input section was not detected.

〔Effect of the invention〕

As is clear from the above explanation, first of all, a circuit with high sensitivity in detecting capacitance changes is required, but since such a circuit often suffers from input malfunctions, the present invention describes a method for preventing this. It is something.

One of the causes of this input malfunction is thought to be noise from conductive parts other than the detection part of the conductive film, but as in the present invention, this noise can be reduced by screen printing to thin fluorine resin or other polymeric non-dielectric materials. It can be prevented by simply applying it. This has made it possible to manufacture a capacitive coordinate detection device that has high sensitivity and does not malfunction even when many lead electrode sections are wired together. Moreover, the processing process itself is no different from conventional methods, and the manufacturing process is simple and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a principal part diagram showing an example of the configuration of a coordinate position detection device that converts capacitance changes into a pulse oscillation frequency and is further combined with a frequency-voltage conversion circuit. FIG. 2 is a sectional view taken along line A-A' in FIG. (1): Film substrate. (2): Examination I ■. (3): Dielectric film. (4): Non-dielectric film. (5): Miller integration circuit. (6): Pulse oscillation circuit. (Crab F-V conversion circuit. (8) (9): Detection electric grinding switching circuit. αQ: Lead electrode.

Claims (1)

[Claims] In a capacitive coordinate detection device comprising a plurality of detection electrodes arranged adjacently corresponding to coordinate positions to be detected on a plastic film substrate, and further covering the surface of the detection electrodes with a polymer dielectric film, A capacitive coordinate detection device characterized in that a non-dielectric polymer film is coated on the conductor of the lead wire connecting a connector connected to a detection circuit and a detection electrode to prevent erroneous input operations.