WO2015130013A1

WO2015130013A1 - Touch pen capable of sensing writing pressure

Info

Publication number: WO2015130013A1
Application number: PCT/KR2015/000734
Authority: WO
Inventors: 김태원; 김종광; 오준혁; 강민우
Original assignee: (주)파트론
Priority date: 2014-02-27
Filing date: 2015-01-23
Publication date: 2015-09-03
Also published as: KR101573521B1; KR20150101723A

Abstract

A touch pen capable of sensing a writing pressure is disclosed. A touch pen according to the present invention includes a housing, a nib protruding from one end of the housing, and a writing pressure sensor having a capacitance which changes according to a pressure applied to the nib.

Description

Touch pen which can sense pressure

The present invention relates to a touch pen capable of detecting a pen pressure, and more particularly, to a capacitive touch pen whose capacitance changes according to the pen pressure.

Recently, an electronic device having a function of mounting a touch panel and indicating a position by a touch has been widely used. In particular, with the spread of mobile electronic devices such as smartphones or tablet computers, touch screen panels are widely used.

In recent mobile electronic devices, a capacitive touch method that detects a location through a change in capacitance is widely used. Capacitive touch has the advantage of fast response and relatively accurate. However, the conventional capacitive touch method has a disadvantage in that it does not detect the pen pressure or other auxiliary signals of the touch.

On the other hand, the EMR method using the electromagnetic signal generated from the circuit element has the advantage of being able to detect the pressure and the auxiliary signal while accurately detecting the position. However, there is a disadvantage in that the panel is expensive and a positioning pen having a circuit structure must be used.

In the conventional case, a capacitive touch panel and an EMR panel had to be mounted together in order to use a touch pen capable of touching a part of the human body (for example, a finger) and sense a pen pressure and an auxiliary signal. . Therefore, the structure is complicated, the price was expensive.

Therefore, there has been a demand for a structure capable of detecting a pen pressure and an auxiliary signal and a touch pen implementing the capacitive touch method.

An object of the present invention is to provide a touch pen capable of detecting a pen pressure even in a capacitive type.

Another object of the present invention is to provide a touch pen including a pen pressure sensor capable of detecting an accurate pen pressure with a simple structure.

Another object of the present invention is to provide a touch pen capable of recognizing a switch operation even in a capacitive type.

Touch pen capable of detecting the pen pressure of the present invention for solving the above problems includes a housing, a nip protruding into one end of the housing and a pen pressure sensor whose capacitance changes according to the pressure applied to the nip.

In one embodiment of the present invention, the pen pressure sensor, the capacitance formed by changing the area of the electrode in contact with one surface of the dielectric due to the change in the pen pressure can be changed.

In one embodiment of the present invention, the pen pressure sensor, a dielectric having one surface and the opposite surface of the one surface, a first electrode formed on the one surface, a second electrode extending from the one surface to the opposite surface and the opposite surface It may include a third electrode formed on.

In one embodiment of the present invention, when the first pressure pen pressure is applied to the nip, the conductive member for contacting the second electrode and the third electrode to electrically connect the second electrode and the third electrode It may further include.

In one embodiment of the present invention, the conductive member is coupled to the nip can move in the same direction.

In one embodiment of the present invention, the conductive member is formed of a flexible material, the area in contact with the opposite surface of the dielectric may vary according to the pressure applied to the nip.

In one embodiment of the present invention, the conductive member may be a conductive rubber.

In one embodiment of the present invention, when the pen pressure of the second stage greater than the pen pressure of the first stage is applied to the nip, in the state in which the conductive member is electrically connected to the second electrode and the third electrode, The area in contact with the opposite surface can be increased.

In one embodiment of the present invention, the conductive member and the nip may be electrically connected.

In one embodiment of the present invention, the second electrode and the third electrode may be spaced apart from each other on the opposite surface.

In one embodiment of the present invention, at least a part of the second electrode and the third electrode may face each other with the first electrode and the dielectric interposed therebetween.

In one embodiment of the present invention, the second electrode has a side that connects the one side, the one side and the opposite side and the connecting portion formed over the opposite side and the width smaller than the connecting portion, wherein the It may include a narrow portion extending from one end formed on the opposite surface to the vicinity of the third electrode.

In one embodiment of the present invention, when the pen pressure of the first step is applied to the nip, the conductive member for contacting one end of the narrow portion and the third electrode to electrically connect the narrow portion and the third electrode. It may include.

In one embodiment of the present invention, further comprising a ground, the first electrode may be electrically connected to the ground.

In one embodiment of the present invention, the second electrode may be electrically connected to the nip.

In one embodiment of the present invention, at least one auxiliary capacitor connected in parallel with the pressure sensor and disposed between the auxiliary capacitor and the pressure sensor to selectively control the electrical connection of the auxiliary capacitor and the pressure sensor The switch may further include.

In one embodiment of the present invention, further comprising a ground, one end of the auxiliary capacitor may be electrically connected to the ground, the other end may be electrically connected to the nip.

In one embodiment of the present invention, the capacitance of the auxiliary capacitor may be greater than the maximum value of the capacitance change amount of the pressure sensor.

In one embodiment of the present invention, further comprising a ground, the ground may be electrically connected to the housing.

In addition, the touch pen of the present invention for solving the above problems is a housing, a nip protruding into one end of the housing and one end is electrically connected to the nip, the other end is connected to the ground, the electrical contact with the nip by a switch The connection includes a capacitor that is selectively controlled.

The touch pen capable of sensing a pen pressure according to an embodiment of the present invention may detect a pen pressure even in a capacitive type.

In addition, the pen pressure sensor included in the touch pen capable of detecting the pen pressure of the present invention can detect an accurate pen pressure with a simple structure.

In addition, the touch pen capable of detecting the pen pressure of the present invention can recognize the operation of the switch even in the capacitive type.

1 is a view schematically showing a state of use of a touch pen capable of detecting a pen pressure according to an embodiment of the present invention.

2 is a cross-sectional view schematically illustrating a configuration of an inside and an outside of a touch pen capable of detecting a pen pressure according to an exemplary embodiment of the present invention.

3 is a cross-sectional view of a pen pressure sensor of a touch pen capable of detecting a pen pressure according to an embodiment of the present invention.

4 is a perspective view illustrating dielectrics and electrodes of a pen pressure sensor of a touch pen capable of detecting a pen pressure according to an embodiment of the present invention.

5 is a cross-sectional view of the pen pressure sensor showing a state in which the pen pressure of the first stage is applied to the nip.

6 is a cross-sectional view of the pen pressure sensor showing a state in which the pen pressure of the second stage is applied to the nip.

7 is a graph illustrating capacitance of a pen pressure sensor according to a change in pen pressure.

8 is a circuit diagram illustrating an electrical connection structure of elements of a touch pen.

9 is a graph for explaining a change in capacitance of the touch pen.

10 (a) and 10 (b) are schematic diagrams of a touch pen and a touch panel for explaining a capacitance change of the touch pen and a change in the touch panel.

FIG. 11 (a) schematically illustrates the change of the touch panel when only the touch capacitance is present, and FIG. 11 (b) schematically illustrates the change of the touch panel when the pressure capacitance and the auxiliary capacitance are added to the touch capacitance. It is.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention; In describing the present invention, if it is determined that adding specific descriptions of techniques or configurations already known in the art may make the gist of the present invention unclear, some of them will be omitted from the detailed description. In addition, terms used in the present specification are terms used to properly express the embodiments of the present invention, which may vary according to related persons or customs in the art. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

Throughout the specification, reference to a component as being combined with another component includes not only the two components being directly coupled, but also being coupled through different media between the two components. In addition, the mention of an element in electrical connection with another element includes not only the two elements being directly connected, but also through another conductive medium between the two elements.

In addition, in the accompanying drawings, it should be noted that some of the elements are exaggerated for effective explanation of the contents. In addition, parts denoted by the same reference numerals throughout the specification represent the same components.

Hereinafter, a touch pen capable of detecting a pen pressure according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

Referring to FIG. 1, the touch pen 100 capable of detecting a pen pressure may be used together with an electronic device including a touch panel 200 capable of recognizing a touch input. Specifically, the present invention may be used with an electronic device equipped with the touch screen panel 200, in particular, a smart phone, a tablet computer, a laptop computer, and the like.

The touch pen 100 of the present invention may be in contact with the surface of the touch panel 200 to indicate a position on the touch panel 200. Throughout this specification, the description that the touch pen 100 is in contact with the surface of the touch panel 200 indicates that the touch pen 100 is not only in direct contact with the surface of the touch panel 200, but also the touch pen 100 is touch panel 100. It should be construed to include also being located very close to the surface of (200).

Referring to FIG. 2, the touch pen 100 of the present invention includes a housing 110, a nip 120, a pressure sensor 130, an auxiliary capacitor 140, a switch 150, and a ground 170.

The housing 110 may accommodate a portion of the nip 120, the pressure sensor 130, the auxiliary capacitor 140, and the like. The housing 110 may have an internal space for accommodating elements.

In detail, the housing 110 may accommodate the circuit board 160 in an internal space. An inner side surface of the housing 110 may include a coupling member that may be coupled to and fixed to the circuit board 160.

The pressure sensor 130, the auxiliary capacitor 140, the switch 150, and the like may be mounted on the circuit board 160. In addition, a circuit pattern may be formed on the circuit board 160 to electrically connect the mounted devices. In addition, the ground 170 may be formed in one region of the circuit board 160.

For example, a circuit pattern connecting elements such as the pen pressure sensor 130 and the auxiliary capacitor 140 and the elements may be formed on one surface of the circuit board 160, and the ground 170 may be formed on the other surface of the circuit board 160. .

The housing 110 may be formed in a pen-like shape, and an opening may be formed at one end to communicate an external space with an internal space. The housing 110 may be formed in a shape in which the diameter decreases toward one end where the opening is formed. Through this opening, the nip 120 protrudes outward from the internal space of the housing 110.

The switch 150 may be coupled to the side of the housing 110. In detail, an opening through which the switch 150 may be coupled may be formed at a side of the housing 110. Through this opening, the switch 150 may be inserted and connected to a circuit housed in the housing 110.

The outer side of the housing 110 may be formed with a structure such as a projection that can prevent the sliding, etc. according to the designer's choice. The housing 110 may be formed of a plastic-based material or a metal material, but is not limited thereto.

The nib 120 is in direct contact with the touch panel when the touch pen 100 of the present invention is used. Nip 120 is disposed over the interior and exterior space of the housing 110. Specifically, the nip 120 protrudes to the outside through an opening formed at one end of the housing 110, and one end of the nip 120 protrudes to the outside to directly contact the touch panel, and the other end is an inner space of the housing 110. Placed in and combined with other components.

One end of the nip 120 is preferably formed of a conductive material. The touch panel of the electronic device used together with the touch pen of the present invention may be a capacitive touch method. The capacitive touch method senses a position by a change in capacitance formed between an object located near or in contact with a surface of the touch panel and a sensor of the touch panel.

In addition, one end of the nip 120 is preferably formed of a flexible material to have a predetermined surface area to form a predetermined surface area in contact with the touch panel. This is because an area facing the sensor of the touch panel must be greater than or equal to a predetermined area in order for capacitance to be formed between the sensor of the touch panel. Nip 120 may be formed of, for example, conductive rubber or conductive flexible plastic.

3 is a cross-sectional view of a pen pressure sensor of a touch pen capable of detecting a pen pressure according to an embodiment of the present invention. 4 is a perspective view illustrating dielectrics and electrodes of a pen pressure sensor of a touch pen capable of detecting a pen pressure according to an embodiment of the present invention.

3 and 4, the pen pressure sensor 130 includes a dielectric 134, a first electrode 131, a second electrode 132, a third electrode 133, and a conductive member 135.

The capacitance of the pen pressure sensor 130 changes according to the applied pen pressure. Specifically, as the pressure increases, the capacitance increases. Capacitance is determined by the relationship

(C: capacitance, ε: dielectric constant of dielectric, A: area of electrode, d: distance between electrodes)

In the pressure sensor 130 of the present invention, the relative dielectric constant epsilon and the dielectric 134 thickness d do not change, and the capacitance C changes as the area A of the electrode changes.

The dielectric 134 has one surface 134-a, an opposite surface 134-b facing one surface, and a side surface 134-c connecting the opposite surface to one surface. The one surface 134-a and the opposite surface 134-b are preferably formed to be horizontal to each other. The dielectric 134 may be formed in a hexahedral shape or a cylindrical shape.

When the dielectric 134 is coupled inside the housing 110, one side 134-a of the dielectric 134 faces in the opposite direction of the nip 120, and the opposite side 134-b faces the nip 120. Can face.

First, second, and

third electrodes

131, 132, and 133 are formed on the surface of the dielectric 134.

The first electrode 131 is formed on one surface 134-a of the dielectric 134. In detail, the first electrode 131 may be formed at a portion corresponding to one side of one surface 134-a of the dielectric 134. The second electrode 132 extends from one surface of the dielectric 134 to the opposite surface 134-b. The third electrode 133 is formed on the opposite surface 134-b of the dielectric 134.

The second electrode 132 may include one surface portion 132-a, a side portion 132-c, and an opposite surface portion 132-b which are divided according to positions on the formed dielectric 134. Specifically, one surface portion 132-a of the second electrode 132 is formed on the opposite side of one side of one surface on which the first electrode 131 is formed among the one surface 134-a of the dielectric 134. The first electrode 131 and the second electrode 132 are spaced apart from each other on one surface 134-a of the dielectric 134. The side portion 132-c of the second electrode 132 extends from a portion of the one surface portion 132-a of the second electrode 132 that is in contact with the side surface 134-c of the dielectric 134 and thus the dielectric 134. Extends to abutment with the opposite side (134-b). The opposite side portion 132-b of the second electrode 132 extends from the side portion 132-c of the second electrode 132 that abuts against the opposite side 134-b of the dielectric 134.

In particular, referring to FIG. 4, the opposite surface portion 132-b of the second electrode 132 has a smaller width than the other portion and has a narrow portion 132-b ′ extending to the vicinity of the third electrode 133. Include.

The second electrode 132 may be divided into a connection portion and a narrow portion 132-b ′. The connecting portion is formed on one side 134-a, side 134-c, and opposite side 134-b of one side of the dielectric 134. The narrow portion 132-b ′ is formed on the opposite side of the dielectric 134. The narrow portion 132-b ′ has a width smaller than that of the connection portion and extends from one end formed on the opposite surface 134-b of the dielectric 134 to the vicinity of the third electrode 133.

The second electrode 132 and the third electrode 133 are formed spaced apart from each other on the opposite surface 134-b of the dielectric 134. Specifically, a spaced portion is formed between one end of the narrow portion 132-b ′ of the second electrode 132 and the third electrode 133. One end of the narrow portion 132-b ′ and the third electrode 133 may have various shapes, and thus the shape of the spaced apart portion may be determined.

Referring to FIG. 3 again, at least some of the second electrode 132 and the third electrode 133 face each other with the first electrode 131 and the dielectric 134 interposed therebetween. In detail, the narrow portion 132-b ′ of the second electrode 132 and the third electrode 133 may face the first electrode 131.

The first electrode 131 may be electrically connected to the ground 170. The second electrode 132 and the third electrode 133 may be electrically connected to the nip 120 when a pen pressure is applied to the touch pen 100. Accordingly, when a pen pressure is applied to the touch pen 100, capacitance is formed between the first electrode 131, the second electrode 132, and the third electrode 133.

Referring to FIG. 3, the conductive member 135 is disposed such that one end thereof faces the opposite surface 134-b of the dielectric 134 and the other end thereof faces the nip 120. The other end of the conductive member 135 may be combined with the nip 120. The conductive member 135 may be directly coupled to the nip 120 or may be coupled through a separate coupling member. In addition, the nip 120 and the conductive member 135 may be integrally formed. Accordingly, the conductive member 135 may move in the same direction as the nip 120. The conductive member 135 and the nip 120 may be electrically connected.

When a pen pressure is applied to the nip 120, the nip 120 moves inward of the housing 110. The conductive member 135 coupled with the nip 120 also moves in the same direction. Accordingly, one end of the conductive member 135 may contact the opposite surface 134-b of the dielectric 134 while approaching the opposite surface of the dielectric 134.

The conductive member 135 may be formed of a flexible material. The conductive member 135 may be formed of, for example, conductive rubber or conductive flexible plastic. Accordingly, one end of the conductive member 135 may be changed in shape by an additional pressure applied in contact with the opposite surface 134-b of the dielectric 134. Specifically, as the pen pressure increases, the contact area between one end of the conductive member 135 and the opposite surface of the dielectric 134 increases.

5 is a cross-sectional view of the pen pressure sensor 130 showing a state in which the pen pressure of the first stage is applied to the nip 120.

Referring to FIG. 5, when the first pressure pen pressure is applied to the nip 120, the conductive member 135 contacts the second electrode 132 and the third electrode 133 on opposite surfaces of the dielectric 134. . Specifically, one end of the narrow portion 132-b ′ of the second electrode 132 is in contact with the third electrode 133. Accordingly, the second electrode 132 and the third electrode 133 are electrically connected. As such, a state in which the second electrode 132 and the third electrode 133 are electrically connected to each other is called an initial contact state.

In this state, the second electrode 132 facing the first electrode 131 and the first electrode 131, the third electrode 133, and the opposite side contact portion of the conductive member 135 (second electrode 132). And a portion overlapping with the third electrode 133). This is a sharp increase in the area of the electrode where the capacitance is formed than the initial state. Specifically, the area of the electrode is increased by the size of the opposite contact portion (except for portions overlapping with the second electrode 132 and the third electrode 133) of the conductive member 135 and the third electrode 133. As a result, the capacitance formed in proportion to the increase in the area of the electrode described above increases. Through this, the pen pressure sensor 130 may measure the pen pressure applied to the nip 120.

6 is a cross-sectional view of the pen pressure sensor 130 showing a state in which the pen pressure of the second stage is applied to the nip 120.

Referring to FIG. 6, when the pen pressure of the second stage greater than the pen pressure of the first stage is applied to the nip 120, the conductive member 135 receives a greater external force. This increases the contact area between one end of the conductive member 135 and the opposite surface 134-b of the dielectric 134. Even in this situation, the conductive member 135 electrically maintains the second electrode 132 and the third electrode 133. In the state where the pen pressure of the second stage is applied, the area of the electrode increases by an increase in the contact area of one end of the conductive member 135 than the state where the pen pressure of the first stage is applied. As a result, the capacitance formed in proportion to the increase in the area of the electrode described above increases.

7 is a graph showing the capacitance of the pen pressure sensor 130 according to the change in pen pressure.

Referring to FIG. 7, when the pen pressure of the first stage is changed from the initial state to the initial contact state, the amount of change in capacitance is greater than that of the pen pressure. However, when the pen pressure of the second stage is applied while the pen pressure of the first stage is applied, the amount of change in capacitance relative to the change of the pen pressure is relatively small. This is because the area of the electrode changes rapidly as much as the area of the third electrode 133 when the state changes from the initial state to the initial contact state. This makes it possible to accurately detect the initial contact state.

The pen pressure sensor 130 of the present invention has a measurable pen pressure range. When the pen pressure of the maximum measurable value is applied, the shape change of the electroconductive member 135 reaches a maximum value. As a result, the contact area between one end of the conductive member 135 and the opposite surface of the dielectric 134 also reaches a maximum value and does not increase further.

8 is a circuit diagram illustrating an electrical connection structure of elements of a touch pen. The circuit diagram schematically shows an equivalent circuit corresponding to the touch pen.

Referring to FIG. 8, the auxiliary capacitance may be connected in parallel with the pen pressure sensor 130. In detail, one end of the auxiliary capacitor 140 is electrically connected to the ground 170, and the other end thereof is electrically connected to the nip 120.

The auxiliary capacitor 140 may be selectively controlled in electrical connection with the pen pressure sensor 130 by a switch 150 disposed between the pen pressure sensor 130. In detail, when the switch 150 is shorted, the auxiliary capacitor 140 is connected in parallel with the pressure sensor 130. When the switch 150 is open, the parallel connection between the auxiliary capacitor 140 and the pressure sensor 130 is broken. The operation unit of the switch 150 is exposed to the outside of the housing 110, the user of the touch pen of the present invention can operate according to their intention.

The auxiliary capacitor 140 and the switch 150 may be mounted on the circuit board 160 accommodated in the housing 110. In addition, one or more

auxiliary capacitors

140 and 150 may be included.

In the touch pen 100, the touch capacitance C _touch generated by the nip 120 is located near or in contact with the touch panel 200, the pressure capacitance C _pressure generated by the pen pressure sensor 130, and The auxiliary capacitances C _switch formed by the operation of the switch 150 are connected to each other in parallel. The switch 150 is positioned between the pressure sensor 130 and the auxiliary capacitor 140 to selectively control the electrical connection of the auxiliary capacitor 140.

The capacitance C _total of the entire touch pen 100 is determined by the combined capacitance of the touch capacitance C _touch , the pen pressure capacitance C _pressure , and the auxiliary capacitance C _switch . The composite capacitance of the entire touch pen is determined by the following formula.

According to the above formula, the capacitance C _total of the entire touch pen 100 is increased by the capacitance increase when the capacitance of the pen pressure sensor capacitance C _pressure and the auxiliary capacitance C _switch increases.

9 is a graph for explaining a change in capacitance of the touch pen.

Referring to FIG. 9, the capacitance C _total of the touch pen 100 is determined according to whether the nip 120 is touched, the pen pressure applied, and whether the switch 150 is opened or closed. Therefore, in the touch pen 100 of the present invention, the capacitance C _total may be changed by the touch of the nip 120, the pen pressure applied by the user, and the manipulation of the switch 150.

Capacitance C _total may be formed in the touch pen 100 even when the nip 120 of the touch pen 100 is not in direct contact with the touch panel 200, but is located in close proximity to the touch pen 200. This is the capacitance formed between the nip 120 and the touch panel 200 between the dielectric layer and some air layer. The non-contact proximity state of the touch pen 100 may be defined as a hovering state. An additional operation method of the touch pen 100 may be implemented by using a change in capacitance C _total of the touch pen in the hovering state.

If the nip 120 of the touch pen 100 is in direct contact with the touch panel 200 and a pen pressure smaller than the minimum pen pressure (corresponding to the pen pressure of the first step described above) recognized by the pen pressure sensor 130 is applied, the touch pen is applied. There is only a touch capacitance C _{touch in the} capacitance C _total .

The minimum contact state is a case where the nip 120 of the touch pen 100 is in direct contact with the touch panel 200, and a minimum pen pressure (pen pressure in the first stage) is applied to the pen pressure sensor 130. In this case, the capacitance C _total of the touch pen is added with a pressure capacitance C _pressure to the touch capacitance C _touch .

When a pen pressure of at least the minimum pen pressure is applied to the touch pen 100, the touch pen 100 corresponds to a pressurized state. In the pressurized state, the pressure capacitance C _pressure is formed. The pen pressure capacitance C _pressure varies with the pen pressure applied to the nip 120. As the applied pen _pressure increases, the pen pressure capacitance C _pressure increases, and the capacitance C _total of the touch pen 100 also increases.

In the capacitance C _switch of the auxiliary capacitor 140, the connection of the entire circuit is determined according to the operation of the switch 150. When the switch 150 is shorted and the auxiliary capacitor 140 is connected to the circuit, the capacitance C _total of the touch pen 100 increases, and when the switch 150 is opened and the auxiliary capacitance C _switch is separated from the circuit, the touch pen 100 The capacitance of C _total decreases.

It is preferable that the auxiliary capacitance C _switch for increasing the capacitance C _total of the touch pen 100 by the operation of the switch 150 is greater than the maximum value of the pen pressure capacitance C _pressure . This is for the touch pen 100 of the present invention to simultaneously detect the magnitude of the pen pressure and whether the switch 150 is operated.

If the auxiliary capacitance C _switch is smaller than the maximum pressure capacitance C _pressure-max , the strong pen pressure state with the switch 150 open and the weak pressure state with the switch 150 shorted The capacitance of the touch pen 100 may be the same. In this case, it may be difficult to simultaneously detect whether the pen pressure and the switch 150 are manipulated through the capacitance C _total of the touch pen 100.

If the auxiliary capacitance C _switch is greater than the maximum pressure capacitance C _pressure-max , the maximum pressure of the pen pressure is applied when the switch 150 is opened, so that the switch 150 is larger than the maximum pressure capacitance C _pressure . In the short-circuited state, the minimum pressure is applied to increase the composite capacitance C _total when the pressure capacitance C _pressure is the smallest. Therefore, in this case, the pen pressure and the switch 150 may be simultaneously detected through the capacitance C _total of the touch pen 100.

Referring to FIGS. 10A and 10B, the capacitive touch panel recognizes a change in capacitance to determine a contact position. The touch pen 100 is in contact with the surface of the touch panel 200 to induce a change in capacitance of the touch panel 200. The touch panel controller detects a contact position of the touch pen 100 on the touch panel 200 by detecting a change in capacitance C _{total of} the touch panel 200.

In this case, when the combined capacitance C _total of the touch pen 100 is changed, a change in capacitance variation of the touch panel 200 may be induced.

In detail, the touch panel 200 detects a contact position by detecting a change amount of _mutual capacitance C _mutual between the driving electrode 210 and the sensing electrode 220. In this case, when the touch pen 100 contacts the surface of the touch panel 200, the mutual capacitance C _mutual decreases. When the capacitance C _total of the touch pen 100 is increased by the pressure sensor 130 or the auxiliary capacitor 140 of the touch pen 100, the decrease amount of the _mutual capacitance C _mutual increases.

In general, the touch panel controller senses a change amount of _mutual capacitance C _mutual through a change in voltage. Compared to FIG. 11 (a), FIG. 11 (b) reduces the voltage distributed to the _mutual capacitance C _mutual by the added pressure capacitance C _pressure and the auxiliary capacitance C _switch . As a result, the touch controller may recognize that the _mutual capacitance C _mutual is reduced.

The touch panel may detect the contact position by sensing the amount of change in the magnetic capacitance. In general, when the amount of change in the magnetic capacitance is detected, the magnetic capacitance increases when the touch pen is touched. At this time, when the capacitance of the touch pen is increased by the pressure sensor 130 or the auxiliary capacitance of the touch pen, the increase amount of the magnetic capacitance increases.

It is not limited to the touch panel 200 to grasp the contact position of the touch pen 100. Changing the capacitance change amount of the touch panel 200 according to the change in the composite capacitance C _total of the touch pen 100 may be applied to all capacitive touch panels.

As such, the capacitive touch panel may recognize a change in the composite capacitance C _total of the touch pen 100. Through this, the pressure applied to the touch pen 100 and the operation of the switch 150 may be recognized.

In the above, embodiments of the touch pen capable of detecting the pen pressure of the present invention have been described. The present invention is not limited to the above-described embodiment and the accompanying drawings, and various modifications and variations will be possible in view of those skilled in the art to which the present invention pertains. Therefore, the scope of the present invention should be defined not only by the claims of the present specification but also by the equivalents of the claims.

Claims

housing;

A nip protruding to one end of the housing; And

The pressure sensor whose capacitance changes according to the pressure applied to the nip

Touch pen capable of detecting a pen pressure.
According to claim 1,

The pressure sensor,

A touch pen capable of detecting a pen pressure, the capacitance of which is formed as the area of the electrode in contact with one surface of the dielectric due to the pen pressure is changed.
According to claim 1,

The pressure sensor,

A dielectric having one surface and an opposite surface of the one surface;

A first electrode formed on the one surface;

A second electrode extending from the one surface to the opposite surface; And

A third electrode formed on the opposite surface

Touch pen capable of detecting a pen pressure.
The method of claim 3, wherein

When the pen pressure of the first stage is applied to the nip, the touch capable of detecting the pen pressure further comprises a conductive member in contact with the second electrode and the third electrode to electrically connect the second electrode and the third electrode. pen.
The method of claim 4, wherein

The conductive member is coupled to the nip is a touch pen capable of detecting the pen pressure moving in the same direction.
The method of claim 4, wherein

The conductive member is made of a flexible material, and a touch pen capable of detecting a pen pressure in which an area in contact with the opposite surface of the dielectric is changed according to the pen pressure applied to the nip.
The method of claim 4, wherein

The conductive member is a touch pen capable of detecting a pen pressure which is a conductive rubber.
The method of claim 4, wherein

When the pen pressure of the second stage greater than the pen pressure of the first stage is applied to the nip, the area in contact with the opposite surface is increased while the conductive member electrically connects the second electrode and the third electrode. Touch pen which can sense pressure to say.
The method of claim 4, wherein

And a touch pen capable of detecting a pen pressure to which the conductive member and the nip are electrically connected.
The method of claim 3, wherein

The second electrode and the third electrode is a touch pen capable of sensing the pen pressure is formed spaced apart from each other on the opposite surface.
The method of claim 3, wherein

At least a portion of the second electrode and the third electrode is a touch pen capable of sensing a pen pressure facing the first electrode and the dielectric therebetween.
The method of claim 3, wherein

The second electrode,

A connection portion formed on the one side, a side connecting the one surface and the opposite surface, and the opposite surface; And

A narrow portion having a smaller width than the connecting portion and extending from one end formed on the opposite side of the connecting portion to the vicinity of the third electrode.

Touch pen capable of detecting a pen pressure.
The method of claim 12,

When the pen pressure of the first stage is applied to the nip, the touch pen capable of detecting the pen pressure further comprising a conductive member contacting one end of the narrow portion and the third electrode to electrically connect the narrow portion and the third electrode. .
The method of claim 3, wherein

Further includes grounding,

The first electrode is a touch pen capable of sensing the pen pressure electrically connected to the ground.
The method of claim 3, wherein

The second electrode is a touch pen capable of sensing the pen pressure electrically connected to the nip.
According to claim 1,

At least one auxiliary capacitor connected in parallel with the pressure sensor; And

And a switch disposed between the auxiliary capacitor and the pen pressure sensor to selectively control an electrical connection between the auxiliary capacitor and the pen pressure sensor.
The method of claim 16,

Further includes grounding,

One end of the auxiliary capacitor is electrically connected to the ground, the other end is a touch pen capable of sensing the pen pressure electrically connected to the nip.
The method of claim 16,

And a capacitance of the auxiliary capacitor is greater than a maximum value of capacitance variation of the pen pressure sensor.
According to claim 1,

Further includes grounding,

The ground is a touch pen capable of sensing the pen pressure electrically connected to the housing.
housing;

A nip protruding to one end of the housing; And

One end of which is electrically connected to the nip, the other end of which is connected to ground, and a capacitor in which electrical connection with the nip is selectively controlled by a switch.

Touch pen containing.