JP2003084904A - Input device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coordinate input device with high speed and precision. SOLUTION: Several strip electrodes formed on a coordinate inputting surface constitute a group. When a panel is touched, the accurate touched position is determined by guessing the position of the touched strip electrode according to the detected voltage and detecting the voltage of only two adjacent groups of electrodes with a lead wire which is placed between the two groups and nearest to the strip electrode.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for inputting a position on a coordinate plane in a man-machine interface of an information processing device or a home electric appliance.

[0002]

2. Description of the Related Art As a device for inputting position information on a plane, a touch type input device having an input plane in which electrodes are formed in a matrix is found, as seen in Japanese Patent Application No. 2000-023163.

FIG. 3 is a block diagram of a touch panel according to the present invention, in which the strip electrodes are divided into groups of several strips to reduce the number of leads, and the strip electrodes are grouped into five groups. The case is shown.

In the present invention, it is detected whether or not Vin is detected at the input of the A / D converter for the first group 301 of strip-shaped electrodes formed on the sheet,
By sequentially detecting the second group 302, the third group 303, ..., And the fifth group 305 to identify the strip-shaped electrodes in which Vin is detected, the position where the touch operation is performed is output as coordinate values. There is.

If the time required to determine whether Vin is detected in the A / D converter in one group is T, theoretically, if there are n groups, then T
It takes a time of × n.

[0006]

In the patent, when it is attempted to increase the size of the panel while maintaining the resolution of the touch position, the number of the strip electrodes on the sheet is increased and the strip electrodes of the entire strip electrode are increased. You have to increase the number of. However, as the number of groups increases, it takes time to sequentially detect each group, and the position detection speed decreases accordingly.

An object of the present invention is to provide a touch type input device which can detect a position at high speed and with high accuracy without being affected by the panel size.

[0008]

In the control device for a touch input device according to the present invention, a group of several strip-shaped electrodes formed on a coordinate input plane is grouped into one group and touched. The voltage sensed in this case gives a rough idea of which strip electrode it is.

The above object is achieved by detecting the voltage by touching and specifying the touched position only for two groups centered on the leader line closest to the registered strip electrode.

The rough position detection may be performed by dividing the strip-shaped electrodes into several groups.

The rough position detection can be omitted if the touch is continued.

A resistor may be inserted between the ground side of the group and the ground so that the lower limit of the detection voltage becomes 0 V or more.

In the detection of a voltage by touch, when a low voltage of 1/2 or less of the supply voltage is detected, the voltage supply side and the ground side of the group are exchanged so that the voltage of 1/2 or more is detected. Good.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a basic configuration according to the present embodiment, which comprises a strip electrode 101, a resistance component 102 connecting the strip electrode 101 and a lead wire 103, and FIG. The relationship between the strip electrodes is 6 in this example.
The case of a book is shown.

FIG. 3 is a configuration diagram of a touch panel in which the configuration shown in FIG. 1 is configured by a plurality of groups as one group and the number of lead lines is reduced.

Letting Rg be the resistance component connecting the strip electrodes of each group, and paying attention to the electrode having the lead wire 103,
It has the same basic configuration as shown in FIG.

Here, the value of Vin detected by the touch is 0 to 0.5 × as shown in FIG. 4 when the voltage detected by the electrodes without lead lines existing between the electrodes with lead lines is allowed as variation. In the range of IRg, the electrode position with the first lead wire, 0.5 × IRg to 1.5 × IRg
If the touched position of the electrode with the leader line is set by setting the judgment standard that allows vertical variation around the theoretical value, such as the electrode position with the second leader line in the range of It is possible to specify a rough position that is close to the th position.

However, at the end of the group closest to ground,
Almost 0V is detected when touched, and it cannot be distinguished from when not touched.

FIG. 5 shows an example in which a resistor 501 is inserted on the ground side at the time of detecting the rough position. The inserted resistance value Rs makes it possible to distinguish from the case where the end electrode is touched and a voltage IRs (V) exceeding 0 V is detected and the end electrode is not touched.

In FIG. 6, when the detection voltage is equal to or lower than an arbitrary voltage, the side to which the voltage is applied and the side to be grounded are controlled to be reversed without inserting the resistor.

In this case, even if a voltage close to 0V is detected, if it is reversed, a voltage close to the applied voltage will be detected. If it is not touched, it remains 0V even if it is reversed, so it is possible to detect whether or not it has been touched.

Now, when the voltage is detected and the position of the electrode with the lead wire is found, a voltage is applied to the electrodes with the lead wires on both sides of the electrode with the detected lead wire as shown in FIG. When the voltage due to touch is detected by the A / D converter, it is possible to specify which electrode on both sides of the electrode having the lead wire detected by the rough position detection is touched.

The A / D converter used for the detection here is the same as that for the above-mentioned rough position detection, but the detection range is narrow, so that it is sufficient for specifying the touched position.

However, when the electrodes with the first and last leader lines are detected by the rough position detection, the electrodes with the leader lines cannot be centered. In this case, the voltage is applied to the electrode with the lead wire detected as shown in FIG. 9, and the electrode with the second inner lead wire is grounded from there. As shown in FIG. 10, the position physically touched cannot be outside the electrode having the lead line at the end, and therefore detection can be performed only inside the electrode having the lead line.

The rough position detection does not necessarily have to be performed for all groups at once. FIG. 11 shows the rough position detection
It is a diagram divided into times. In the example, 10 groups are divided into 5 groups, and after detecting the approximate position of the right half, the approximate position of the left half is detected.

Even in the rough position detection, the accuracy decreases as the number of groups increases. By dividing the detection into a plurality of times, it is possible to maintain arbitrary accuracy even when the number of groups is further increased.

In the rough position detection, since the voltage is detected by the resistance component of the entire panel, the detection position deviation due to the resistance variation is large, but in the case of this method, even if there is the position deviation here, it is detected again in a narrowed range. Finally, since the coordinates are output as position coordinates, it is possible to perform accurate detection that is less susceptible to variations in resistance and changes over time.

[0024]

By applying the control circuit according to the present invention, high-speed position detection can be easily realized regardless of the size of the touch panel.

Further, although the resolution of the A / D converter does not need to be so high, the accuracy is good, and there is little influence of variations in resistance value and changes with time, and a product with good performance stability and continuity is provided. it can.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of a touch panel used in a conventional invention and the present invention.

FIG. 2 is a diagram showing a correspondence relationship between a detected potential and a position of a strip electrode in the conventional invention.

FIG. 3 is a configuration diagram of a touch panel having a plurality of groups used in the conventional invention and the present invention.

FIG. 4 is a diagram showing a correspondence relationship between a detected potential and a position of an electrode having a lead wire in the present invention.

FIG. 5 is an explanatory diagram of a detection method by resistance insertion for distinguishing when a touch is made and when not touched in a rough position detection.

FIG. 6 is an explanatory diagram of a detection method based on voltage application and ground reversal for distinguishing when a touch is made and when not touched in a rough position detection

FIG. 7 is an explanatory diagram of a method for identifying an accurate touch position.

FIG. 8 is a diagram showing a correspondence relationship between a detected potential and a position of a touched electrode.

FIG. 9 is an explanatory diagram of a method for identifying an accurate touch position when the electrode at the end is detected.

FIG. 10 is a diagram showing a correspondence relationship between the detected potential and the position of the touched electrode when the endmost electrode is detected.

FIG. 11 is an explanatory diagram of a method of separately performing rough position detection.

[Explanation of symbols]

100 base film 101 transparent electrode 102 resistance component 103 lead lines 301, 302, 303, 304, 305 transparent electrode group 501 resistance

Continued front page    F term (reference) 5B068 AA02 BB04 BC16 BD20 BE08                 5B087 AA01 CC16 CC26 CC36                 5J055 AX00 AX02 BX50 CX00 EX33                       EY00 EY01 FX00 FX12 GX06                       GX08

Claims (3)

[Claims] 1. A plurality of first electrodes formed in a strip shape,
A first sheet including a first resistance component connected to the first electrode and a first wiring connected to the first resistance component; a plurality of second electrodes formed in a strip shape; A second sheet including a second resistance component connected to the electrode and a second wiring connected to the second resistance component, wherein the first sheet and the second sheet are the first electrode and the second electrode. The second
A touch-type coordinate input device in which electrodes are arranged so as to be substantially orthogonal to each other, and the first electrode and the second electrode are divided into groups of a plurality of electrodes. A touch input device having a control circuit for specifying a touch position in a corresponding group. 2. The touch input device according to claim 1, wherein a resistance is inserted between the first resistance component and the ground so that the lower limit of the detection voltage by touch exceeds 0V. 3. The touch detection voltage is 1 / of the applied voltage.
The touch input device according to claim 1, further comprising a control circuit that reverses the voltage application side and the ground side when the number is 2 or less.