TW201624244A - Capacitive touch panel and touch position calculation method thereof - Google Patents

Abstract

Disclosed is a capacitive touch panel having a circuitous conductor pattern structure. The capacitive touch panel contains a number of first axial conductor assemblies and a number of second axial conductor assemblies, wherein each second axial conductor assembly includes a number of second axial conductor cells which are composed of a number of bar shape figures with accordion shape or wave shape edges. Electrical fields and induced capacitors are generated between adjacent axial conductor assemblies with different directions when giving control signals. Then the touched location is detected. Circuitous conductor pattern increases the area of the first axial conductor assembly and the sensing range of electrical field, thus the amount of the axial conductor assemblies and conduction lines can be reduced.

Description

Capacitive touch panel and calculation method of touch position thereof

The invention relates to a structural design of a touch panel, in particular to a capacitive touch panel with a touch graphic structure and a calculation method of the touch position thereof. Touch Panels have been widely used in home appliances, communications, electronic information and other product applications. Such as the current widely used personal digital assistant (PDA), various home appliances, game input interface. Through the integration of the touchpad and the display, the user can select the desired action by a finger or a stylus according to the function options on the display screen, such as a personal digital assistant (PDA), various home appliances, and a game input interface. And it is used to the public system inquiry tool, etc., to provide a convenient operating system.

The conventional touch panel is provided with a sensing area on the surface of a substrate, and the sensing area is used to sense the signal of the human body's finger or the sensing pen to achieve the purpose of touch. Most of the materials used in the sensing area are transparent conductive films (such as indium tin oxide ITO), so that the user can touch the transparent conductive film to control the corresponding picture on the display during operation.

At present, the touch principle commonly used can be divided into different technical principles such as resistance type, capacitance induction type, infrared induction type, electromagnetic induction type, and sound wave induction type. The working principle of the capacitive inductive touch panel is to detect the coordinates of the touch position from the induced current generated by the capacitance change generated by the electrostatic combination between the arranged transparent electrodes and the human body. Since capacitive sensing touch panels have better advantages in terms of transmittance, hardness, accuracy, reaction time, touch life, operating temperature, and starting strength, they have been widely used.

In order to detect the position of the user touching the touch panel with a finger or a sensor pen, the manufacturer has developed various capacitive sensing touch sensing technologies. For example, in the patent application No. 2012/0256642, a single-layer touch sensing system is disclosed, which can be applied to detect a touch position on a touch sensing surface. The single layer touch sensing system includes two axial conductive groups, and the two axes are perpendicular to each other. The first axial conductive group is composed of a plurality of first conductive units connected to each other, and the second axial conductive group is composed of a plurality of second axial conductive units connected by wires, and different axial and adjacent conductive groups Keep the appropriate distance between the units. Each conductive group is electrically connected to a corresponding wire, and then connected to a control circuit, the control circuit provides a signal to the two sets of different axial conductive groups through the wire, so that adjacent axial and adjacent conductive units are adjacent The range produces an induced electric field. If the user touches the adjacent range, the equivalent capacitance value of the induced electric field is changed, and the user is estimated according to the change amount of the capacitance value. Touch location. The conductive unit has an E-shape or a ring shape.

In the invention patent of the Japanese Patent No. I457813, a single-layer capacitive touch panel is disclosed, which utilizes adjacent regions between different axial conductive units as compared with the patent application No. 2012/0256642. An induced electric field is generated, and the touch position is estimated according to the amount of change in the value of the sensing capacitance. The difference is that the adjacent regions between the different axial conductive units of this patent use a toothed structure.

In the invention patent of U.S. Patent No. 8,502,796, a capacitive touch panel is disclosed. The capacitive sensing layer is characterized in that the second axial conductive unit is composed of long strips of different lengths, so that the induced electric field has different strengths. Distribution, the central region of the electric field distribution adopts a long strip shape, the electric field is strong, and the surrounding area of the electric field distribution adopts a short strip shape, and the electric field is weak. Since the electric field has a strong or weak difference, the amount of change in the sensed capacitance value when the user touches the center of the electric field and the electric field is different, so that the electric field sensing range can be increased and the touch position can be estimated. This architecture has the effect of improving the electric field distribution and increasing the sensitivity of the induction, and saves the number of wires and reduces the complexity of the control circuit.

In the new patent of the patent No. M447541, a capacitive touch panel is disclosed. The capacitive sensing layer is characterized in that the conductive unit and the wire are composed of non-linear geometric figures, and the conductive unit and the wire on the touch panel are improved. Luminosity improves the display of the display panel.

Looking at the above patents, US Patent No. 2012/0256642 Ming patent application, Taiwan Patent No. I457813 invention patent case and Taiwan Patent No. M447541 new patent case disclose the geometry of various conductive units, but the induced electric field does not make a strong difference, so the size of the conductive unit is limited by the user's touch. Control area. The conductive unit in the invention patent of U.S. Patent No. 8,502,796 is composed of long strips of different lengths, so that the induced electric field has different intensity distributions, so that the area of the conductive unit and the range of the electric field can be increased, and the touch is estimated. position. However, the distribution of the electric field is asymmetrical. If the touch position is calculated in a general manner, there will be an error, and if a special calculation method is used, the complexity and operation time of the control circuit will be increased.

Therefore, the sensing layer of the touch panel needs to increase the electric field sensing range and make the electric field distribution symmetrical, which not only increases the sensing range of the conductive unit, but also reduces the number of wires, and avoids increasing the complexity and operation time of the control circuit.

This paragraph of text extracts and compiles some of the features of the present invention; other features will be described in subsequent paragraphs. Its purpose is to cover the spirit and scope of the subsequent patent scope, different retouching and similar arrangements.

The main object of the present invention is to provide a single-layer capacitive touch panel that uniformly distributes the induced electric field. The single layer capacitive touch panel includes two axial conductive groups, and the two axial directions are perpendicular to each other. First axial direction The conductive group is composed of a plurality of first conductive units connected to each other, and the second axial conductive group is composed of a plurality of second axial conductive units connected by wires, and is reserved between different axial and adjacent conductive units. Proper distance. Each conductive group is electrically connected to a corresponding wire, and then connected to a control circuit, the control circuit provides a signal to the two sets of different axial conductive groups through the wire, so that adjacent axial and adjacent conductive units are adjacent The range produces an induced electric field. The conductive unit is composed of long strips of different lengths, and the edges of the conductive unit are treated in a meandering or wavy manner, so that the induced electric field has different intensity distributions, increasing the sensing range, and at the same time making the induced electric field distribution more uniform and reducing the induced electric field. The calculation error caused by the asymmetry causes the control circuit to derive an accurate touch position.

The invention also discloses a conductive unit pattern for adjusting the distribution of the induced electric field. The conductive unit is basically composed of long strips of different lengths, and is treated in a meandering or wavy manner at the edge of the geometric center of the conductive unit, so that the center of the induced electric field is located at the geometric center of the conductive unit, so that the induced electric field has different strengths. The distribution makes the induced electric field distribution symmetrical, reduces the calculation error caused by the asymmetry of the induced electric field, and makes the control circuit calculate the precise touch position.

The invention also discloses a method for calculating a touch position according to the foregoing conductive unit. The method comprises: calculating a plane coordinate of the center of the electric field according to the pattern of the conductive unit; and calculating the positive according to the variation of the value of the induced capacitance of each induced electric field and the weighted result of the plane coordinates of the center of the electric field The touch location is correct.

According to the present invention, a capacitive touch panel of the present invention includes: a substrate having a meandering touch pattern structure formed on a surface of the substrate; a plurality of first axial conductive groups and a first axis Provided on a surface of the substrate; a plurality of second axial conductive groups, each of the second axial conductive groups comprising a plurality of second axial conductive units disposed on the surface of the substrate in a second axial direction Wherein the second axial conductive unit is connected by a plurality of long strip patterns, the edges of which are line-shaped or wavy; and a plurality of second axial wires respectively connected to each of the second axial conductive units The edge of the substrate surface.

According to the present invention, a capacitive touch panel of the present invention includes: a substrate having a meandering touch pattern structure formed on a surface of the substrate; a plurality of first axial conductive groups and a first axis Provided on a surface of the substrate; a plurality of second axial conductive groups, each of the second axial conductive groups comprising a plurality of second axial conductive units disposed on the surface of the substrate in a second axial direction The second axial conductive unit is formed by connecting a plurality of long strip patterns, wherein a partial region has a zigzag line distribution to increase an area adjacent to the first axial conductive group; and a plurality of second axial wires Each of the second axial conductive units is connected to the edge of the substrate surface.

According to the present invention, a capacitive touch panel of the present invention includes: a substrate having a zigzag touch pattern structure formed on the substrate a plurality of first axial conductive groups disposed on the surface of the substrate in a first axial direction; a plurality of second axial conductive groups, each of the second axial conductive groups comprising a plurality of second An axial conductive unit disposed on the surface of the substrate in a second axial direction, wherein the second axial conductive unit is formed by connecting a plurality of elongated patterns, and a partial region thereof is different from the first axial conductive group The distance is adjusted to the magnitude of the induced electric field between the first axial conductive group; and a plurality of second axial wires are respectively connected from each of the second axial conductive units to the edge of the substrate surface.

According to the concept of the present invention, the edge of the second axial conductive unit is added with a line-shaped or wavy line, a partial region plus a zigzag line distribution, and a feature that is different from the first axial conductive group, and can be combined with each other.

According to the present invention, the capacitive touch panel further includes a plurality of floating sensing units, each of the floating sensing units being disposed between the first axial conductive group and the second axial conductive unit.

According to the concept of the present invention, the adjacent first axial conductive groups have the same shape or a line symmetry relationship; the second axial conductive units belonging to the same second axial conductive group are identical in shape or in the same shape. Line symmetry relationship.

According to the present invention, the distance between the first axial conductive group and the adjacent second axial conductive unit is 0.3 to 0.5 mm.

According to the present concept, the first axial conductive group and the second axis The width of the conductive unit is 0.2 to 0.6 mm.

According to the present invention, the meandering edge of the first axial conductive group and the second axial conductive unit has a tortuosity of 15 to 25 degrees.

According to the present invention, the width and spacing of the second axial wires are 0.02 to 0.05 mm.

According to the concept of the present invention, the width of the wiring area of the second axial wire is 1.5 to 2.2 mm.

According to the present invention, the present invention also provides a touch position calculation method for a capacitive touch panel, which includes the following steps: equally spaced a plurality of basic touch coordinates, and measuring the sensing result of each basic touch coordinate, and then The measurement result is recorded as a sensing value comparison table; and the comparison sensing result and the sensing value comparison table are used to calculate a basic touch coordinate of more than one proximity touch position, and then the value of the sensing value is compared with the sensing value. Calculate the precise touch position to detect the user's touch position.

101‧‧‧First axial conductive group

201‧‧‧Second axial conductive group

202‧‧‧Second axial conductive unit

203‧‧‧Second axial conductor

30‧‧‧suspension sensing unit

FIG. 1 is a diagram showing a touch graphic structure of a conventional capacitive touch panel.

FIG. 2 is a diagram showing a touch pattern structure of a single-layer capacitive touch panel according to a first embodiment of the present invention, wherein the second axial conductive unit is formed by connecting a plurality of long strip patterns, and the edges thereof are line-shaped or Wavy.

FIG. 3 is a diagram showing a single-layer capacitive touch panel according to a second embodiment of the present invention. a touch graphic structure, wherein the second axial conductive unit is formed by a plurality of long strip patterns, the edges of which are polygonal or wavy, and the partial regions have a zigzag line distribution to increase the first axial conductive group Group adjacent areas.

The invention will be more clearly described with reference to the following examples. It is to be noted that the following description of the embodiments of the present invention is intended to be illustrative only.

The capacitive touch panel of the present invention comprises a substrate and has a meandering touch pattern structure formed on a surface of the substrate; a plurality of first axial conductive groups 101 disposed in the first axial direction a surface of the substrate; a plurality of second axial conductive groups 201, each of the second axial conductive groups 201 comprising a plurality of second axial conductive units 202 disposed on the surface of the substrate in a second axial direction; A plurality of second axial wires 203 are connected from each of the second axial conductive units 202 to the edge of the substrate surface. The second axial conductive unit 202 is formed by connecting a plurality of long strip patterns, and the edges thereof are in a line shape or a wave shape. The partial region of the second axial conductive unit 202 may have a meandering line distribution to increase the area adjacent to the first axial conductive group 101. Alternatively, a portion of the second axially conductive unit 202 may remain at a different distance than the first axially conductive group. Next, please refer to FIGS. 2A and 2B, which show a first embodiment according to the present invention. The touch graphic structure of the single-layer capacitive touch panel. As shown in FIG. 2B, the touch pattern structure includes six horizontal first conductive groups 101 and ten straight second conductive groups 201. Each of the second axial conductive groups 201 includes six second axial conductive units 202 and a second axial conductive line 203, wherein the leftmost and rightmost second axial conductive units 202 are oriented by four different lengths. The long strip-shaped pattern is connected, the longest strip-shaped pattern has the longest length, and the other long strip-shaped patterns are sequentially decreased inward; the remaining second axial conductive units 202 are composed of seven different lengths. Straight to the long strips of graphics, the length of the long strip in the middle is the longest, and the length of the remaining strips is decremented to the sides. The edge of the second axial conductive unit 202 is in the shape of a broken line. The second axial conductive units 202 belonging to the same second axial conductive group 201 are respectively connected to the edges of the surface of the touch panel by wires, and then connected to each other. The first axial conductive group 101 is laterally distributed in the gap between the second axial conductive units 202, the edges of which are line-shaped and maintain an appropriate distance from the second axial conductive unit 202. When the user touches a long strip-shaped pattern, the induced electric field has a large amount of induction, and the equivalent capacitance value changes greatly. When the user touches a short strip-shaped pattern, the electric field is induced. The amount of inductance is small, and the amount of change in the equivalent capacitance value is also small, and the user's touch position is estimated accordingly.

In this embodiment, the shapes of the adjacent first axial conductive groups 101 may be identical or in a line symmetrical relationship. And the second axial conductive unit 202 belonging to the second axial conductive group 201 and adjacent thereto is also in the shape All the same or in a line symmetry relationship.

The main difference between this embodiment and the previous case is that the edge of the conductive unit is added with a line of fold lines. The second axial conductive unit 202 of the previous case has an asymmetrical asymmetry of the induced electric field due to the upper and lower asymmetry of the pattern, and the calculated touch position may have an error. After the line-shaped lines are added to the edge of the conductive unit, the electric field distribution is relatively uniform, and the symmetry of the induced electric field is improved, so that the touch position can be correctly estimated.

In addition, the capacitive touch panel of this embodiment may further include a plurality of suspension sensing units 30 (indicated by yellow lines), each of the suspension sensing units 30 being disposed on the first axial conductive group 101 and the second axial conductive Between units 202.

Referring to FIG. 3, a second embodiment of the present invention shows a touch pattern structure of a single-layer inductive capacitive touch panel. The touch pattern includes three laterally-oriented first axial conductive groups 101 and three straight second axial conductive groups 201. Each of the second axial conductive groups 201 includes three second axial conductive units 202, wherein the second axial conductive unit 202 substantially adopts an E-shaped pattern and adds a meandering pattern to the geometric center, thus reinforcing the electric field Distribution, and add a small number of meandering patterns on both sides to adjust the electric field distribution. The second axial conductive units 202 belonging to the same second axial conductive group 201 are respectively connected to the edges of the surface of the touch panel by wires, and then connected to each other. The first axial conductive group 101 is laterally distributed in the gap between the second axial conductive units 202, and the edges thereof are added with a line-shaped line, and The two axial conductive units 202 retain the proper spacing. When the user touches a graph with more zigzag patterns, the induced amount of the induced electric field is larger, and the amount of change in the equivalent capacitance value is also larger. When the user touches the graph with less meandering, the amount of induced electric field is induced. Smaller, the amount of change in the equivalent capacitance value is also smaller, and the user's touch position is estimated accordingly.

In this embodiment, the shapes of the adjacent first axial conductive groups 101 may be identical or in a line symmetrical relationship. The second axial conductive units 202 belonging to the second axial conductive group 201 and adjacent to each other have the same shape or a line symmetry relationship.

The main difference between this embodiment and the previous case is that the center of the second axial conductive unit 202 is added with a line-shaped line, so that the center of the induced electric field is adjusted to the center of the conductive unit, and the distribution of the induced electric field is symmetrical. The touch position can be correctly estimated.

In addition, the capacitive touch panel of this embodiment may further include a plurality of suspension sensing units 30, each of which is disposed between the first axial conductive group 101 and the second axial conductive unit 202.

In the embodiment of the present invention, the width of the first axial conductive group 101 and the second axial conductive unit 202 is 0.2-0.6 mm; the distance between the first axial conductive group 101 and the second axial conductive unit 202 is 0.3~0.5mm; the width of each second axial wire 203 wiring area is 1.5~2.2mm; the angle of the edge of the first axial conductive group 101, the second axial conductive unit 202 and the second axial conductive line 203 The camber is 15 to 25 degrees; the width of the second axial wire 203 With a spacing of 0.02~0.05mm.

The present invention also discloses a touch position calculation method for a capacitive touch panel. Taking the touch pattern of FIG. 2 as an example, the distribution of 4×6 induced electric fields is generated due to the asymmetry of the pattern of the second axial conductive unit 202. It is also asymmetrical. If the touch position is directly calculated based on the sensing result, there will be an error. Therefore, before detecting the touch position of the user, 8x12 basic touch coordinates are equally spaced, and the sensing result of each basic touch coordinate is measured, and the measurement result is recorded as a sensing value comparison table; In the touch position, the basic touch coordinates closest to the touch position can be calculated by comparing the value of the sensing result with the value of the sensing value. It is also possible to calculate a plurality of basic touch coordinates near the touch position, and then calculate the precise touch position according to the value of the sensing result and the value of the sensing value.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

101‧‧‧First axial conductive group

201‧‧‧Second axial conductive group

202‧‧‧Second axial conductive unit

203‧‧‧Second axial conductor

30‧‧‧suspension sensing unit

Claims (13)

A capacitive touch panel includes: a substrate having a meandering touch pattern structure formed on a surface of the substrate; a plurality of first axial conductive groups disposed on the substrate in a first axial direction a plurality of second axial conductive groups, each of the second axial conductive groups comprising a plurality of second axial conductive units disposed on a surface of the substrate in a second axial direction, wherein the second axial conductive portion The unit is connected by a plurality of strip-shaped patterns, the edges of which are line-shaped or wavy; and a plurality of second axial wires are respectively connected from each of the second axial conductive units to the edge of the substrate surface. A capacitive touch panel includes: a substrate having a meandering touch pattern structure formed on a surface of the substrate; a plurality of first axial conductive groups disposed on the substrate in a first axial direction a plurality of second axial conductive groups, each of the second axial conductive groups comprising a plurality of second axial conductive units disposed on a surface of the substrate in a second axial direction, wherein the second axial conductive portion The unit is formed by a plurality of strip-shaped patterns, and a partial region thereof has a zigzag line distribution to increase an area adjacent to the first axial conductive group; A plurality of second axial wires are each connected from each of the second axial conductive units to an edge of the substrate surface. A capacitive touch panel comprising: a substrate having a touch pattern structure formed on a surface of the substrate; a plurality of first axial conductive groups disposed on the surface of the substrate in a first axial direction; a plurality of second axial conductive groups, each of the second axial conductive groups comprising a plurality of second axial conductive units disposed on a surface of the substrate in a second axial direction, wherein the second axial conductive unit is a plurality of strip-shaped patterns are connected, a portion of the region remaining at a different distance from the first axial conductive group; and a plurality of second axial wires respectively connected to the substrate from each of the second axial conductive units The edge of the surface. The capacitive touch panel of claim 1, wherein a portion of the second axial conductive unit has a meandering line distribution to increase an area adjacent to the first axial conductive group. The capacitive touch panel of claim 1, wherein the second axial conductive unit retains a different distance from the first axial conductive group. The capacitive touch panel of claim 1, wherein the plurality of floating sensing units further comprises a plurality of suspension sensing units, each of which is suspended The floating sensing unit is disposed between the first axial conductive group and the second axial conductive unit. The capacitive touch panel according to claim 1, wherein the adjacent first axial conductive groups have the same shape or a line symmetry relationship; and belong to the same second axis. To the conductive group and adjacent second axial conductive units, the shapes are identical or in a line symmetrical relationship. The capacitive touch panel of claim 1, wherein the distance between the first axial conductive group and the adjacent second axial conductive unit is 0.3 mm to 0.5. Mm. The capacitive touch panel of claim 1, wherein the first axial conductive group and the second axial conductive unit have a width of 0.2 mm to 0.6 mm. The capacitive touch panel of claim 1 or 3, wherein the first axial conductive group and the meandering edge of the second axial conductive unit have a meandering degree of 15 degrees to 25 degrees. The capacitive touch panel of claim 1, wherein the width and spacing of the second axial wires are 0.02 to 0.05 mm. The capacitive touch panel of claim 1, wherein the width of the second axial conductor is 1.5 to 2.2 mm. A touch position calculation method for a capacitive touch panel, comprising the steps of: distributing a plurality of basic touch coordinates at equal intervals, measuring a sensing result of each basic touch coordinate, and recording the measurement result as a sensing value comparison a table; and comparing the value of the sensing result with the value of the sensing value, calculating a basic touch coordinate of more than one proximity touch position, and calculating an accurate touch position according to the value of the sensing result and the sensing value comparison table, To detect the user's touch position.