JP6985171B2 - Resistive touch panel device - Google Patents

Description

The present invention relates to a resistance film type touch panel device. More specifically, the present invention relates to a circular or substantially circular resistance film type touch panel device having a calibration function.

Conventionally, an analog type resistance film type touch panel device has existed. As shown in FIG. 4, the analog resistance film type touch panel device as a conventional technique has a configuration in which a plurality of dot spacers, which are insulators, are arranged between a square upper electrode and a lower electrode. A transparent conductive film having flexibility is used for the upper electrode. When the upper part of this touch panel device is touched with a finger or a touch pen, the upper electrode at the touched position bends, and the upper electrode and the lower electrode come into contact with each other in the portion where the dot spacer does not exist to conduct conduction. The coordinates of the touched position are detected. The dot spacer is arranged so that the upper electrode and the lower electrode do not accidentally come into contact with each other due to external factors such as the environment.

The analog resistance film type touch panel device can be classified into a 4-wire type, a 5-wire type, or the like depending on the method, and the 4-wire type is often used among these methods. As shown in FIG. 4, the 4-wire type has an X coordinate circuit formed on the upper electrode side and a Y coordinate circuit formed on the lower electrode side. Since the X-coordinate circuit and the Y-coordinate circuit have different voltage gradients, when the voltage at the touched position is measured, the coordinates at that position are detected. Specifically, when the position A is touched while the voltage Vcc is applied between the electrodes X1 and X2 of the X coordinate circuit, the voltage V is generated in the electrode Y1 constituting the lower electrode. At this time, since the transparent conductive film has a uniform resistance value, the ratio (a: b) of the distance a from the touched position A to the electrode X1 and the distance b from the position A to the electrode X2 is It becomes equal to the ratio (R1: R2) of the value of the resistor R1 and the value of the resistor R2. By such a principle, the voltage value of the touched position A is calculated, and the calculated voltage value is A / D converted. As a result, the coordinates of the input position A in the X coordinate circuit are output as digital values. The Y coordinate circuit also outputs the coordinates of the input position A as a digital value by the same principle as the X coordinate circuit.

By the way, the analog resistance film type touch panel device as a conventional technique has the target coordinates on the display screen and the target coordinates depending on the parallax of the user who operates the touch panel and the mounting tolerance between the touch panel and the LCD (Liquid Crystal Display). There may be a discrepancy with the detected coordinates when is touched correctly. Such a deviation is also called a "coordinate deviation", and when a coordinate deviation occurs, a function for correcting the coordinate deviation (hereinafter referred to as a "calibration function") is generally used (for example, a patent). Document 1).

As described above, the analog resistance film type touch panel device as a conventional technique has a configuration for specifying the coordinates of the touched position, so that the shapes of the upper electrode and the lower electrode are both quadrangular. Is a prerequisite. Therefore, the calibration functions conventionally used, including the technique proposed in Patent Document 1, have assumed a quadrangular touch panel.

JP-A-2015-166949

However, when trying to provide a product intended to give a soft impression to the purchaser by, for example, making the shape of the product circular or elliptical, the shape of the touch panel portion is desired to be circular or substantially circular. There are also many requests for the design concept. For this reason, the development of a circular or substantially circular analog resistance film type touch panel device is in progress, and at the same time, it is required to realize a calibration function compatible with a circular or substantially circular analog type resistance film type touch panel device. ing.

The present invention has been made in view of such a situation, and an object of the present invention is to provide a circular or substantially circular analog resistance film type touch panel device having a calibration function.

In order to achieve the above object, the resistance film type touch panel device according to the present invention is
An analog resistance film type touch panel device in which a circular or substantially circular upper electrode portion and a lower electrode portion are arranged so as to face each other.
Five or more calibration points are arranged in the upper electrode portion and the lower electrode portion.
Four or more of the calibration points are arranged in an arc shape in the vicinity of the circular edge portion of the upper electrode portion and the lower electrode portion, and the center of the upper electrode portion and the lower electrode portion. Or, there are two or more pairs of the calibration points connected by a virtual straight line passing through a substantially center.
It is characterized by that.

According to the present invention, since five or more calibration points are arranged in the upper electrode portion and the lower electrode portion, the calibration function can be improved as compared with the conventional case. Further, four or more calibration points are arranged in an arc shape in the vicinity of the circular edges of the upper electrode portion and the lower electrode portion, and are formed by a virtual straight line passing through the center or substantially the center of the upper electrode portion and the lower electrode portion. Since there are two or more pairs of connected calibration points, the area where calibration can be performed can be evenly expanded to the circular edges of the upper electrode portion and the lower electrode portion. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a calibration function.

In the resistance film type touch panel device according to the present invention, when the number of the calibration points is an even number, all of the calibration points are arcuate in the vicinity of the circular edges of the upper electrode portion and the lower electrode portion. Is located in
When the number of the calibration points is an odd number, one of the calibration points is arranged at the center or substantially the center of the upper electrode portion and the lower electrode portion, and all the rest are arranged at the upper electrode portion. And, it is preferable that the lower electrode portion is arranged in an arc shape in the vicinity of the circular edge portion.

According to the present invention, when the number of calibration points is an even number, all the calibration points are arranged in an arc shape in the vicinity of the circular edges of the upper electrode portion and the lower electrode portion, so that the calibration is performed. The area where this can be performed can be evenly expanded to the circular edges of the upper electrode portion and the lower electrode portion, and the calibration function at the circular edges of the upper electrode portion and the lower electrode portion can be improved. .. When the number of calibration points is an odd number, one of the calibration points is arranged at the center or substantially the center of the upper electrode portion and the lower electrode portion, and all the rest are the upper electrode portion and the lower electrode portion. Since it is arranged in an arc shape in the vicinity of the circular edge portion of the portion, the area where calibration can be performed can be expanded to the circular edge portion of the upper electrode portion and the lower electrode portion, and the upper electrode portion and the lower portion can be expanded. The calibration function at the center of the electrode portion can be further improved. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a better calibration function.

In the resistance film type touch panel device according to the present invention, it is preferable that three or more virtual straight lines intersect at the center of the upper electrode portion and the lower electrode portion at an equal angle.
According to the present invention, since the calibration points are evenly arranged in an arc shape, the area where calibration can be performed can be expanded evenly to the circular edges of the upper electrode portion and the lower electrode portion. .. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a better calibration function.

In the resistance film type touch panel device according to the present invention, it is preferable that the number of the calibration points is eight and the pair of the calibration points is four pairs. According to the present invention, since the eight calibration points are arranged in an arc shape, the area where calibration can be performed is further expanded evenly to the circular edges of the upper electrode portion and the lower electrode portion. Can be done. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a better calibration function.

According to the present invention, it is possible to provide a circular or substantially circular analog type resistance film type touch panel device having a calibration function.

It is an external view which shows one Embodiment of the resistance film type touch panel apparatus of this invention. (A) is a plan view, and (B) is a view showing a part of a cross section. It is a figure which shows an example of the voltage mapping which shows the linearity after exerting a calibration function, (A) is a plan view of voltage mapping, (B) is a perspective view of voltage mapping. It is a figure which shows the conventional arrangement example of the calibration point, (A) is the figure which shows the case where there are four calibration points, (B) uses the resistance film type touch panel apparatus which has four calibration points. It is a figure which shows the case where the mesh pattern is drawn by a plurality of orthogonal straight lines. It is a figure which shows the example of the 4-wire analog resistance film type touch panel apparatus among the analog type resistance film type touch panel apparatus as a prior art, (A) is the sectional view, (B) is the image figure which shows the structure, (C). ) Is a diagram showing an equivalent circuit.

The resistance film type touch panel device 1 according to the embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments.

FIG. 1 is an external view of the resistance film type touch panel device 1. (A) is a plan view of the resistance film type touch panel device 1, and (B) is a view showing a part of a cross section of the resistance film type touch panel device 1.

[Basic configuration]
As shown in FIG. 1, the resistance film type touch panel device 1 is an analog type resistance film type touch panel device in which a circular or substantially circular upper electrode portion 11 and a lower electrode portion 21 are arranged so as to face each other. Eight calibration points 100 are evenly arranged in an arc shape in the vicinity of the circular edges of the electrode portion 11 and the lower electrode portion 21, and a virtual straight line L connecting the pair of calibration points 100 is formed above. Four intersect at the center of the electrode portion 11 and the lower electrode portion 21.

Here, the "calibration point" means a target point to be touched when correcting the coordinate deviation of the resistance film type touch panel device 1. As described above, the analog resistance film type touch panel device as a conventional technique is configured to specify the coordinates of the touched position. Therefore, the relationship between the upper electrode portion and the lower electrode portion is the relationship between the vertical axis (Y axis) and the horizontal axis (X axis), so that the shapes of the upper electrode portion and the lower electrode portion are the vertical axis and the horizontal axis. The shape is premised on a shape that is easy to form with the shaft, that is, a quadrangle. Due to such circumstances, the conventional calibration points are also arranged on the premise that the shapes of the upper electrode and the lower electrode are both quadrangular. Specifically, for example, when there are four calibration points, these four calibration points are arranged in the vicinity of the four corners of the quadrangle. Therefore, when four calibration points are arranged in a circular or substantially circular analog resistance film type touch panel device by the conventional arrangement method, the area C to be calibrated is shown in FIG. 3 (A). Only the area inside the rectangle. When a mesh pattern is drawn by a plurality of orthogonal straight lines using such a resistance film type touch panel device, as shown in FIG. 3B, the straight lines existing in the area D other than the area C to be calibrated are found. , Will bend inward. Therefore, it is necessary to minimize the area D where the calibration is not performed and to maximize the area C where the calibration is performed. The specific method for performing calibration is not particularly limited. Any technique for calibration can be used, including traditional techniques.

Hereinafter, each component of the resistance film type touch panel device 1 will be described in detail.

(Upper electrode part)
As shown in FIG. 1, the upper electrode portion 11 includes at least a circular or substantially circular upper electrode plate 101 and a circular or substantially circular upper conductive film 102 in which an X coordinate circuit including a pair of electrodes is formed. Have. In addition, "at least" means that other components may be included. For example, the upper electrode portion 11 may include a circular or substantially circular hard coat (not shown) for protecting the surface of the upper electrode plate 101 from scratches, dirt, and the like.
The upper electrode plate 101 is a circular or substantially circular electrode plate arranged above the upper electrode portion 11. The upper electrode plate 101 is made of a transparent material that bends when touched with a finger or a touch pen. For example, a material such as PET (polyethylene terephthalate) film or thin glass can be used as the upper electrode plate. The upper surface of the upper electrode plate 101 may be treated with a hard coat (not shown) for protecting the surface of the upper electrode plate 101 from scratches, dirt, and the like.
The upper conductive film 102 is a circular or substantially circular conductive film arranged below the upper electrode plate 101 so as to face the lower conductive film 202 described later. An X coordinate circuit including a pair of electrodes is formed on the surface of the upper conductive film 102. The upper conductive film 102 has a uniform resistance value, but the specific resistance value is not particularly limited. For example, a resistor having a resistance value of about 300 Ω / □ to 500 Ω / □ can be used. The material of the upper conductive film 102 is not particularly limited. A transparent film deposited with ITO (Indium Tin Oxide) or coated (printed) with a metal material such as silver can be used.

(Lower electrode part)
Although not shown, the lower electrode portion 21 has at least a circular or substantially circular lower electrode plate 201, a lower conductive film 202 in which a Y coordinate circuit including a pair of electrodes is formed, and a dot spacer 203. In addition, "at least" means that other components may be included. For example, a retardation plate (not shown) for reducing light reflection may be included in the lower electrode portion 21.
The lower electrode plate 201 is a circular or substantially circular electrode plate arranged under the lower electrode portion 21. The material of the lower electrode plate 201 is not particularly limited. For example, soda glass (soda lime glass, soda lime glass), a plastic plate, a film, or the like can be used.
The lower conductive film 202 is a conductive film arranged on the upper part of the lower electrode plate 201 so as to face the upper conductive film 102 with the dot spacer 203 interposed therebetween. A Y coordinate circuit including a pair of electrodes is formed on the surface of the lower conductive film 202. The lower conductive film 202 has a uniform resistance value, but the specific resistance value is not particularly limited. For example, a resistor having a resistance value of about 300 Ω / □ to 500 Ω / □ can be used. The material of the lower conductive film 202 is not particularly limited. A transparent film may be vapor-deposited with ITO (Indium Tin Oxide) or coated (printed) with a metal material such as silver.
The dot spacer 203 is an insulator formed between the upper conductive film 102 and the lower conductive film 202, and the upper conductive film 102 and the lower conductive film 202 are formed when the touch operation to the resistance film type touch panel device 1 is not performed. Prevents erroneous contact. Specifically, the dot spacer 203 is formed on the surface of the lower conductive film 202 by a method such as printing. This makes it possible to prevent the upper electrode portion 11 and the lower electrode portion 21 from being short-circuited due to external factors such as the environment.

(Calibration point)
As shown in FIG. 1, the calibration points 100 are calibration points evenly arranged in an arc shape in the vicinity of the circular edges of the upper electrode portion 11 and the lower electrode portion 21 of the resistance film type touch panel device 1. Four virtual straight lines L connecting a pair of calibration points 100 intersect at the center of the upper electrode portion 11 and the lower electrode portion 21. When the calibration points 100 are arranged as shown in FIG. 1, the eight calibration points 100 are evenly arranged in an arc shape, so that a circular or substantially circular analog method having a better calibration function is provided. The resistance film type touch panel device can be provided.

Next, a specific example when calibration is performed in the resistance film type touch panel device 1 will be described.
FIG. 2 is a diagram showing an example of voltage mapping showing linearity after the calibration function is exerted. Here, the voltage mapping is a graph displayed superimposed on the shape of the resistance film type touch panel device 1, and is divided by color, color, etc. so that the voltage portions of the same size form the same layer. It is a graph displayed. If the linearity is maintained, the boundary line of the layer is displayed as a straight line or a shape close to a straight line. The voltage mapping of the lower electrode portion 21 is omitted because the voltage mapping of the upper electrode portion 11 is rotated by 90 degrees.
Even if the upper electrode portion 11 and the lower electrode portion 21 are circular or substantially circular, the linearity is maintained as a whole as shown in FIG. 2 by performing the calibration at the calibration point 100 having the above configuration. It can be in a drooping state.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within the range in which the object of the present invention can be achieved are included in the present invention. Is. Moreover, various changes may be made as long as it does not deviate from the gist of the present invention.

For example, in the above-described embodiment, eight calibration points 100 are evenly arranged in an arc shape in the vicinity of the circular edges of the upper electrode portion 11 and the lower electrode portion 21, and a pair of calibration points 100 are arranged. Four virtual straight lines L connecting the two intersect at the center of the upper electrode portion 11 and the lower electrode portion 21, but the number of calibration points 100, the number of virtual straight lines L connecting the pair of calibration points 100, and the number of virtual straight lines L. The arrangement interval of the calibration points 100 is not limited to this value and can be any value. As the number of calibration points 100 increases, the calibration function improves, so that the number can be increased as much as possible. However, as the number of calibration points 100 increases, the required ROM (Read Only Memory) capacity also increases accordingly, so that the number of calibration points 100 can be reduced and the calibration effect can be maximized. You can also select any combination.

In summary, the resistance film type touch panel device to which the present invention is applied suffices to have the following configuration, and various embodiments can be taken.
That is, the resistance film type touch panel device to which the present invention is applied (for example, the resistance film type touch panel device 1 in FIG. 1) is
Five or more calibration points (for example, the calibration point 100 in FIG. 1) are arranged in the upper electrode portion (for example, the upper electrode portion 11 in FIG. 1) and the lower electrode portion (for example, the lower electrode portion 21 in FIG. 1). And
Four or more of the calibration points are arranged in an arc shape in the vicinity of the circular edge portion of the upper electrode portion and the lower electrode portion, and the center of the upper electrode portion and the lower electrode portion. Alternatively, there are two or more pairs of the calibration points connected by a virtual straight line (for example, the virtual straight line L in FIG. 1) passing through a substantially center.
As a result, since five or more calibration points 100 are arranged in the upper electrode portion 11 and the lower electrode portion 21, the calibration function can be improved as compared with the conventional case. Further, four or more calibration points 100 are arranged in an arc shape in the vicinity of the circular edge portion of the upper electrode portion 11 and the lower electrode portion 21, and the center or substantially the center of the upper electrode portion 11 and the lower electrode portion 21. Since there are two or more pairs of calibration points 100 connected by a virtual straight line L passing through the above, the area where calibration can be performed is evenly expanded to the circular edges of the upper electrode portion 11 and the lower electrode portion 21. Can be made to. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a calibration function.

Further, when the number of the calibration points is an even number, all of the calibration points are arranged in an arc shape in the vicinity of the circular edge portion of the upper electrode portion and the lower electrode portion.
When the number of the calibration points is an odd number, one of the calibration points is arranged at the center or substantially the center of the upper electrode portion and the lower electrode portion, and all the rest are arranged at the upper electrode portion. And, it is preferable that the lower electrode portion is arranged in an arc shape in the vicinity of the circular edge portion.
As a result, when the number of calibration points is even, all of the calibration points are arranged in an arc shape near the circular edges of the upper electrode portion and the lower electrode portion, so that calibration should be performed. It is possible to evenly expand the area where the surface is formed to the circular edges of the upper electrode portion and the lower electrode portion, and it is possible to improve the calibration function at the circular edges of the upper electrode portion and the lower electrode portion. When the number of calibration points is an odd number, one of the calibration points is arranged at the center or substantially the center of the upper electrode portion and the lower electrode portion, and all the rest are the upper electrode portion and the lower electrode portion. Since it is arranged in an arc shape in the vicinity of the circular edge portion of the portion, the area where calibration can be performed can be expanded to the circular edge portion of the upper electrode portion and the lower electrode portion, and the upper electrode portion and the lower portion can be expanded. The calibration function at the center of the electrode portion can be further improved. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a better calibration function.

Further, in the resistance film type touch panel device according to the present invention, the virtual straight line (for example, the virtual straight line L in FIG. 1) intersects three or more at equal angles at the centers of the upper electrode portion and the lower electrode portion. Is preferable.
As a result, since the calibration points 100 are evenly arranged, the area C where calibration can be performed can be expanded evenly to the circular edges of the upper electrode portion 11 and the lower electrode portion 21. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a better calibration function.

Further, in the resistance film type touch panel device according to the present invention, it is preferable that the number of the calibration points 100 is eight and the pair of the calibration points is four pairs.
As a result, since the eight calibration points 100 are evenly arranged, the area C where calibration can be performed can be further expanded evenly to the circular edges of the upper electrode portion 11 and the lower electrode portion 21. Can be done. As a result, it is possible to provide a circular or substantially circular analog resistance film type touch panel device having a better calibration function.

1 ... Resistive film type touch panel device 11 ... Upper electrode part 21 ... Lower electrode part 100 ... Calibration point 101 ... Upper electrode plate 102 ... Upper conductive film 201 ... Lower electrode Plate 202 ・ ・ ・ Lower conductive film 203 ・ ・ ・ Dot spacer C ・ ・ ・ Area where calibration can be performed D ・ ・ ・ Area where calibration cannot be performed

Claims (4)

An analog resistance film type touch panel device in which a circular or substantially circular upper electrode portion and a lower electrode portion are arranged so as to face each other.
Five or more calibration points are arranged in the upper electrode portion and the lower electrode portion.
Four or more of the calibration points are arranged in an arc shape in the vicinity of the circular edge portion of the upper electrode portion and the lower electrode portion, and the center of the upper electrode portion and the lower electrode portion. Or, there are two or more pairs of the calibration points connected by a virtual straight line passing through a substantially center.
A resistance film type touch panel device characterized by this. When the number of the calibration points is an even number, all of the calibration points are arranged in an arc shape in the vicinity of the circular edge portion of the upper electrode portion and the lower electrode portion.
When the number of the calibration points is an odd number, one of the calibration points is arranged at the center or substantially the center of the upper electrode portion and the lower electrode portion, and all the rest are arranged at the upper electrode portion. And are arranged in an arc shape in the vicinity of the circular edge portion of the lower electrode portion.
The resistance film type touch panel device according to claim 1. Three or more virtual straight lines intersect at the center of the upper electrode portion and the lower electrode portion at an equal angle.
The resistance film type touch panel device according to claim 1 or 2. The number of the calibration points is eight, and the pair of the calibration points is four pairs.
The resistance film type touch panel device according to any one of claims 1 to 3.

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