JPS6231915A - input device - 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] [Industrial application field] The present invention relates to a high precision input device.

[Prior art]

Conventional devices of this kind are disclosed in Japanese Patent Application Publication No. 59-13227 and Japanese Patent Application Publication No. 59-132237.
A first panel provided perpendicular to the total pressure of strip-shaped parallel electrode terminals of 2 fJl each having a predetermined interval on a substrate having electrodes having a constant resistance value, and a sheet resistance value of the first panel. A second panel that has a sheet resistance that is the same as or different from that and that is easily deformed in the direction perpendicular to the surface by applying an external force is bonded to each other with the resistance surfaces facing each other via a plurality of insulating spacers. The contact position between the first panel and the second panel is determined based on the potential obtained from the second panel when voltage is applied to each of the two sets of parallel electrodes at fixed time intervals. It has become.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, when detecting the position of a pressed point on an input device with high precision, it is necessary to make the electrodes with a certain resistance value uniform and the film thickness of the two sets of parallel electrode terminals uniform. It is necessary to make it completely constant, and the same goes for the parallel electrode terminals, but this is actually impossible in terms of manufacturing.

Therefore, the present invention is intended to solve this problem, and its purpose is to raise the position of the pressed point by correction even if the resistance of the electrode and parallel electrode terminal is not completely uniform immediately after manufacture. The reason is that it can be detected accurately.

[Means for solving problems]

The input device of the present invention has electrodes formed almost uniformly on the surface,
A substrate on which two sets of strip-shaped parallel electrode terminals having a sheet resistance smaller than that of the electrodes are disposed perpendicularly on the electrode, and a flexible substrate with electrodes formed on the surface are connected to each other via a plurality of spacers. In the input device formed so that the electrode terminals face each other, a cut is made in the electrode terminal,
It is characterized in that the resistance value between the electrode terminals is changed by the cut.

[Effect]

The operation of the present invention will be explained in detail based on the drawings.

1 to 3 show the basic structure of the present invention. Figure 1 (α
) In (b), an electrode 2 is formed on a substrate 5 to form an electrode terminal 1 having a smaller sheet resistance than the electrode 2, and electrodes are also formed on another substrate 7 as shown in FIGS. 2(a) and (b). form 6. As shown in Figure @3, these are pasted together via a spacer 8 and a plurality of convex spacers 9 so that the electrodes face each other to form an input device. By making a cut 3 in the electrode terminal 1, when a voltage is sequentially applied in the X direction and the Y direction, the voltage appearing on the electrode 2 can be said to have linearity in both the X direction and the Y direction.

This principle will be explained using FIG. 4. To detect the X direction, switch group 10, I(1'i 0 FF,
The switch groups 11 and 11' are turned on. At this time, the A part of the electrode terminal 1 becomes approximately V (V), and the B part of the electrode terminal 1 becomes approximately Grd level. Here, since the resistance of electrode terminal 1 is smaller than that of electrode 2, more current flows through the 0 and D portions of electrode terminal 1 than the current flowing through electrode 2, and the potential distribution at C and D portions of electrode terminal 1 changes. This affects the uniformity of the potential distribution appearing on the electrode 2. Therefore, as shown in FIG. 5, the 0 part and D part 1 of the electrode 2 and electrode terminal 1 are connected to
〜R1゜′, R1=R= R= Pot・e
A cut 3 is made in the C part of the electrode terminal 1 to make Rlo, and a cut 3''f is made in the D part of the electrode terminal 1 to make R, l = R2+ =...R10'. Cut 3 is the resistance value of each block R1~R10mR11~R
1G' was actually measured, and the maximum value R.

m Rx”fr: Find the resistance value of other block is Rx
, Cut as shown in Figure 5 until R31 is reached. Or, using a constant current source, the voltage ′f appearing in each block,
It is also possible to investigate and make a cut 3 so that the voltage drop in one block is constant.

Similarly for the Y direction, switch groups 10, 10 in FIG.
'ftON', switch groups 11, 11' are turned OFF'F, and portions A and B of the electrode terminal 1 are cut off.

By correcting electrode terminal 1 with cut 3 as described above, when voltage is applied to electrode terminal 1, the potential distribution appearing on electrode 2 becomes extremely linear, enabling highly accurate position detection. becomes.

〔Example〕

Example 1 In FIGS. 1 to 5, 1.11 g of glass was used for the substrate 5, 10 (indium oxide) was used for the electrode 2, and the electrode terminal 1
A carbon paste was used for the electrode, a 188 μm PET film was used for the electrode 7, and TO was used for the electrode 6, and three gold incisions were made using a YAG laser. Spacers 9 of several tens of microns were placed between the side substrates, and spacers 8 made of sealing adhesive were placed in all four directions. Board size is approximately 100 x 180
IIIx, and the cut block in Fig. 5 is in the X direction and Y direction.
Both directions are calculated using additive pitch, and the laser spot is 5
Correction was made using μ. Linearity error? If defined as , 2.2% before correction becomes 0.6%
Became. When this input device was installed on a 128 x 256 dot (dot pitch 0.47 m) liquid crystal display and operated in response to dots, the deviation under suppression was ±5 dots before correction, but after correction it became ±2 dots. became.

Example 2 In Example 1, the cut pitch was set to 5 in both the π direction and the Y direction.
When similar corrections were made in this regard, the accuracy of the input device became better than in Example 1, and the linearity error of 1.7 factors before correction became 0.4 factors after correction.

Example 3 The substrate can be transparent or opaque, as can the electrodes. Further, the electrode terminal may be anything as long as it has a smaller sheet resistance than the electrode. For example, when a carbon sheet was used for the electrode 2 and silver paste was printed on the electrode terminal 1, exactly the same effect was confirmed.

Example 4 In Example 1 and Example 3, the laser cut line was
The same can be achieved by etching, cutting with a cutter, etc.

〔Effect of the invention〕

As described above, the present invention can correct errors in position detection caused by non-uniformity of electrodes and electrode terminals on a substrate, making highly accurate position detection possible.

In addition, the difficult manufacturing process of uniformly forming electrodes and electrode terminals on the substrate can be replaced with a method of making cuts using a laser, etc. during the process, making it possible to provide a highly accurate input device. It became.

[Brief explanation of drawings]

FIGS. 1(a) and 2(b), FIGS. 2(a) and 2(b), and FIG. Fourth
5 and 5 are diagrams each explaining the principle of the input device of the present invention. l... Electrode terminal 2.6... Electrode 3e... Cut 4... Lead wire 5.711... Substrate 8... Spacer 9... Convex spacer 1 (J, 10', 11, 11' ...More than switch group! (C1) Fig. 2, -Vusu Kuri-

Claims (1)

[Claims] A substrate on which electrodes are formed almost uniformly on the surface and two sets of strip-shaped parallel electrode terminals having a sheet resistance smaller than the electrodes are provided on the electrodes so as to be perpendicular to each other, and a flexible substrate with electrodes formed on the surface. The input device is formed such that the electrodes face each other via a plurality of spacers, and the input device is characterized in that a cut is made in the electrode terminal, and the resistance value between the electrode terminals is changed by the cut. input device.