JPS61282910A - input device - Google Patents

Abstract

PURPOSE:To obtain an input device of high precision by providing slits in an electrode for input along a potential gradient. CONSTITUTION:An electrode 2 for input is formed approximately uniformly on surfaces of a pair of substrates 1 for input, and the potential gradient is given in the direction crossing the electrode 2 for input, and slits 4 are provided along the potential gradient in the electrode for input. Thus, the position detection error due to ununiformity of electrode resistors on substrates is corrected to detect positions with high precision.

Description

[Detailed description of the invention] [Field of application to which the invention pertains] The present invention is directed to a highly accurate input device.

[Conventional technology]

In conventional devices of this type, when detecting the position of a pressed point on an input device with high precision, it is necessary that the resistance values of the electrodes on the two substrates that make up the input device be completely uniform. there were. However, in order to make the resistance value of the electrodes on this substrate completely uniform, it is necessary to make the film thickness of the electrodes completely constant, but this is actually impossible due to the manufacturing of the electrodes. There was.

[Problem that the invention seeks to solve]

Therefore, in such conventional input devices, the resistance value of the electrode on the board cannot be formed uniformly over the entire surface, so there is a problem that the position of the pressed point cannot be detected with high precision. There was a point.

The present invention was made to solve these conventional problems, and it is possible to detect the position of the pressed point with high accuracy even if the resistance value of the electrode on the substrate is not uniform over the entire surface. The purpose is

[Means to solve problems]

An input device is constituted by two substrates having electrodes formed almost uniformly on their surfaces and having electrode terminals at both ends of the electrodes, with the electrode surfaces facing each other and aligned in a direction that intersects the electrode terminals. By making cuts in the entire surface of the electrode, the resistance value between the electrode terminals is changed and the resistance uniformity between the electrodes is improved.

[Effect]

The operation of the present invention will be explained in detail based on the drawings. FIG. 1 shows the basic structure of the invention.

In FIG. 1 (α), the resistance of the electrode 2 between the electrode terminals 3 is corrected by the cut 4. FIG. 1(b) shows the principle of correction. The electrode 2 can be considered as being divided into R1 to RIO in FIG. 1(b), and depending on the number of cuts 4, R,=
R,:...R,=R,. In other words, it is made so that That is, the electrode 2 is divided into a plurality of blocks, and the resistance value of each block is changed and corrected by changing the area.

Next, a method of calculating the area change rate of each block will be explained. As shown in FIG. 2, dle'! e...dk...d5
...d is each block. A voltage V is applied between the electrode ends +5+13, and the potential on the electrode 2 is measured at (% x 1) points as shown in FIG. The average potential of each fZ line is v(/"I '1)+V(/"*'z)+・
” ”−+V (fZ s gm) υ X= (1) First, find [υ1, v2...υn]. Next, the theoretical voltage drop υTH of each block is v d se = v − v x =
(a), expressed as X·1, and then calculate the difference from the theoretical voltage νTH.

υ(dz-TH)=vdsc-υTH...(4)(
4) The block with the maximum value of υ(dx-TH) determined by the formula is set as the maximum resistance value block, and the following calculations are performed to set the resistance values of the other blocks to their maximum resistance values. If the voltage drop of the maximum value block is (ldmax), then the following equation is obtained.In other words, if the area of each block is reduced by the ratio of P, the resistance between the electrode terminals 3 approaches uniformity.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

(Example 1) Figure 3 shows a PET (188 μ) film for the upper substrate, glass (1,1 t) for the lower substrate, vapor deposition TO 9 electrode terminal, 2 paste for the electrode terminal, and a cut in the electrode TO. A prototype voltage detection type input device was fabricated using a laser (Young). A spacer of several tens of microns was placed between the upper and lower substrates, and sealing adhesive was placed on all four sides. The board size is approximately 100 x 180 mm, and the cut block is 2
The pitch was set at 0 am pitch as shown in Figure 3. The diameter of the laser tube was approximately 25μ. The resistance uniformity was significantly improved by this correction, and the difference between the measured potential in the untreated state and the wII potential was less than '/3. Also,
Considering the linearity error, 2.4% when untreated was corrected to 0.7%. This input device is 128 x 256 dots (dot pitch α47)
When it was installed on a digital LCD display and operated for dots, the one with 5 dots on the top of the suppression shift when unprocessed,
After correction, it was corrected to ±2 dots.

(Example 2) When the same correction as in Example 1 was made by changing the cut pitch to 511!111, the resistance uniformity was the same as in Example 1.
The linearity error is 1.9%, O,S%
I was able to.

(Example 3) In Example 1, the cut pitch is Q, 57IIffi
When the same correction was performed, the resistance uniformity was better than that in Example 2, and the linearity error of 2.0% was
I was able to make it 4%.

(Example 4) In Examples 1 to 4, the cuts were made as shown in 4th fM(b). In other words, by reducing the operating distance of the laser trimmer, it is possible to achieve the same resistance change as shown in FIG. The input-inhibitable portion 8 may be adjusted according to the resolution, and in this embodiment, it is set to 100μ based on the LODDOT size, Q, and am. The resistance uniformity could be corrected to the same level as in Examples 1 to 4. Also, on LaD (
When I tried operating it on DOT size Q, 4),
I was able to input data in all areas and had no problems at all. Note that the length t is preferably 10 to 50 μ.

Note that the input device of the present invention may be of a current detection type instead of a voltage detection type. Furthermore, the substrate may be transparent or opaque, and the same applies to the electrodes. Furthermore, the cut by laser can be similarly achieved by etching, cutter, etc.

〔Effect of the invention〕

As described above, according to the present invention, errors in position detection caused by non-uniformity of electrode resistors on a substrate are corrected, and highly accurate position detection becomes possible. In addition, the difficult manufacturing process of uniformly forming electrode resistors on the substrate can be replaced with a method of making cuts using a laser or the like during the process, making it possible to provide a highly accurate input device. It got easier.

[Brief explanation of drawings]

FIG. 1 shows (αi(1, basic structure 1 of the present invention) FIG. 2 shows an implementation example of the present invention, FIG. 3 shows an input section in an embodiment of the input device of the present invention, and FIG. 4 shows a basic structure of the present invention. Another example is shown below. 1... Substrate 2... Electrode 3... Electrode terminal 4... Cut 5... Effective area boundary line 6...This is the potential measurement point.

Claims (1)

[Claims] Input electrodes are formed almost uniformly on the surfaces of a pair of input substrates constituting an input section, and each input electrode has a potential gradient in a direction that intersects with each other, and cuts are made in the input electrode along the potential gradient. An input device characterized by being provided with.