WO2021002524A1 - Touch sensor module - Google Patents

Abstract

The present invention relates to a touch sensor module. The touch sensor module comprises: a spacer; a target part positioned above the spacer and formed from a conductive material; and a coil part positioned below the spacer and comprising a first substrate and a plurality of first coils which are aligned side by side along a first direction on the first substrate and in which a coil adjacent to the first direction is wound in the opposite direction. The inductance of the target part and the coil part changes in accordance with a change in the distance between the target part and the coil part, and the touch sensor module detects the change in the inductance.

Description

Touch sensor module

The present invention relates to a touch sensor module.

In general, portable electronic devices such as smart phones and MP3s, or home appliances such as refrigerators, have a touch panel for outputting various operation states and inputting commands such as commands by a touch operation. Is attached.

Accordingly, the touch panel may include only a touch sensor module for recognizing a user's touch motion, or a display device module for visually outputting information as well as a touch sensor module may be combined.

At this time, the display module used in the touch panel is typically an OLED (organic light emitting diode) display device, particularly an AMOLED (active matrix organic light emitting diode) or a liquid crystal display device. do.

In addition, the touch sensor module uses a two-dimensional touch sensing method that detects a touch point using coordinates of the X-axis and Y-axis, as well as a three-dimensional touch sensing method that additionally detects the intensity of a touch applied in the Z-axis direction, which is the pressing direction. Has become.

For this 3D touch sensing method, conventionally, although the intensity of the touch is sensed using a pressure sensor or an image sensor, there is a problem in that the change in touch intensity cannot be accurately detected.

In addition, there occurs a problem that it is not possible to accurately detect whether or not a touch is touched even depending on the installation location of the sensor for sensing touch.

Prior art literature

Republic of Korea Patent Registration No. 10-1777733 (Registration date: September 6, 2017, title of invention: 3D touch device using image sensor and opaque member)

The problem to be solved by the present invention is to improve the touch sensitivity of the touch sensor module.

The touch sensor module according to one aspect of the present invention for solving the above problem is a spacer, a target part formed of a conductive material, located above the spacer, and a target part formed of a conductive material, and a first substrate and the first substrate In the first direction, the coils adjacent in the first direction include a coil unit including a plurality of first coils wound in opposite directions, and the distance between the target unit and the coil unit is changed. Accordingly, inductance of the target part and the coil part are changed, and the touch sensor module detects a change in the inductance.

The plurality of first coils may be positioned on at least one of an upper surface and a lower surface of the first substrate.

The winding direction of each first coil positioned on the same surface of the first substrate may be opposite to the winding direction of adjacent first coils.

When the plurality of first coils are located on the upper and lower surfaces of the first substrate, windings of the first coils facing each other in a second direction orthogonal to the first direction with respect to the first substrate The directions can be the same.

The touch sensor module according to the feature is stacked on the coil unit in a second direction orthogonal to the first direction under the spacer, and is arranged in the first direction on the second substrate and the second substrate to be arranged side by side. It may further include an additional coil unit having a plurality of second coils.

The winding direction of the additional coil part may be the same as the winding direction of the coil part.

The plurality of second coils may be positioned on at least one of an upper surface and a lower surface of the second substrate.

The winding direction of the second coil positioned on the same surface of the second substrate may be opposite to that of the adjacent second coil.

When the plurality of second coils are located on the upper and lower surfaces of the second substrate, windings of the second coils facing each other in a second direction orthogonal to the first direction with the second substrate as the center The directions can be the same.

The target portion may be a metal plate.

The touch sensor module according to the above feature may further include an electromagnetic shielding film positioned below the target part.

The target portion may include a second substrate and a plurality of second coils arranged parallel to each other in the first direction on the second substrate.

The plurality of second coils may be positioned on at least one of an upper surface and a lower surface of the second substrate.

The winding direction of the second coil positioned on the same surface of the second substrate may be opposite to that of the adjacent second coil.

When the plurality of second coils are located on the upper and lower surfaces of the second substrate, windings of the second coils facing each other in a second direction orthogonal to the first direction with the second substrate as the center The directions can be the same.

Each second coil may be positioned to face each first coil along a second direction orthogonal to the first direction.

The touch sensor module according to the above characteristics may further include an electromagnetic shielding film positioned at least one of an upper portion of the target portion and a lower portion of the coil portion.

The spacer may be formed in the form of a flat plate positioned between the target portion and the coil portion.

The spacer may be made of polyethylene, polyurethane, or polyolefin.

According to this feature, by using a plurality of coil units stacked, the total number of coils formed in the touch sensor module is easily increased.

As a result, the range of changes in inductance occurring in the touch sensor module increases, thereby improving the sensitivity of the touch sensor module.

In addition, instead of using a separate target metal in the form of a plate, a coil unit facing each other is used to cause a change in inductance according to the touch operation to detect the touch operation.

Accordingly, since the number of coil windings of the two coil portions facing each other is increased to increase the amount of inductance generated, the sensitivity of the touch sensor module is increased.

In addition, since a separate target metal is not required, the touch sensor module can be mounted at a desired position without difficulty in mounting the touch sensor module, thereby increasing the degree of freedom in design for a corresponding product having the touch sensor module.

1 is a conceptual cross-sectional view of a touch sensor module according to an embodiment of the present invention.

FIG. 2 is a diagram schematically illustrating an example in which a coil part is formed on a substrate on a substrate in the touch sensor module shown in FIG. 1.

3 is a conceptual cross-sectional view of a touch sensor module according to another embodiment of the present invention.

4 is a diagram schematically illustrating an example in which an upper coil part and a lower coil part are formed on a first substrate and a second substrate, respectively, in the touch sensor module illustrated in FIG. 3.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, for techniques or configurations already known in the field

If it is determined that adding a detailed description may make the subject matter of the present invention unclear, some of these will be omitted from the detailed description. In addition, terms used in the present specification are terms used to appropriately express embodiments of the present invention, and these may vary according to related people or customs in the field. Accordingly, definitions of these terms should be made based on the contents throughout the present specification.

The terminology used herein is for reference only to specific embodiments and is not intended to limit the invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. As used in the specification, the meaning of'comprising' specifies a specific characteristic, region, integer, step, action, element and/or component, and other specific characteristic, region, integer, step, action, element, component and/or group It does not exclude the existence or addition of

Hereinafter, a touch sensor module according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, a touch sensor module according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

1 is a conceptual cross-sectional view of a touch sensor module according to an embodiment of the present invention. FIG. 2 is a diagram schematically illustrating an example in which a coil part is formed on a substrate on a substrate in the touch sensor module shown in FIG. 1.

As shown in FIG. 1, the touch sensor module 1 of this example includes a target portion 10, a spacer 20 positioned under the target portion 10, and at least a spacer 20 positioned under the spacer 20. One coil unit (301, 302), a first adhesive layer 401 positioned between the spacer 20 of the target unit 10, and a second adhesive layer positioned between the spacer 20 and the coil unit 301 It has 402.

The target unit 10 is a touch object in which a touch operation is performed by a touch tool such as a finger in the touch sensor module 1, and a plate-shaped housing covering the upper part of the touch sensor module 1 (eg, a touch sensor module ( It may be a housing of a product having 1).

Since the target portion 10 is made of a conductive material such as metal to generate inductance with at least one of the coil portions 301 and 302, the target portion 10 may be a metal plate.

The spacer 20 is for distance separation between the target portion 10 and the coil portion 301, and the target portion 10 and the coil portion 301 are spaced apart by the thickness of the spacer 20.

This spacer 20 is formed in a flat plate shape generally located between the target part 10 located at the top and the coil part 301 located at the bottom, so that the distance between the target part 10 and the coil part 301 Let it.

At this time, the first adhesive layer 401 and the second adhesive layer 402 are applied to the entire upper and lower portions of the spacer 20, respectively.

Accordingly, the target portion 10 and the coil portion 301 adjacent to the spacer 20 are safely positioned on the upper and lower surfaces of the spacer 20, respectively, and the spacer 20 is the target portion 10 It is located between the entire lower surface of) and the entire upper surface of the coil unit 301.

The spacer 20 is made of a material having an elasticity having excellent resilience and compression rate, for example, polyethylene, polyurethane, polyolefin, etc., and may have a waterproof and dustproof function. .

In this way, since the spacer 20 is formed in a plate shape, the target portion 10 located on the upper portion of the spacer 20 has no bending phenomenon when the touch operation is not performed by the support operation by the spacer 20 Keep the initial state stably. Accordingly, the reliability of the operation of the touch sensor module 1 is improved and the life of the touch sensor module 1 is extended.

In this way, the air gap, which is the distance between the target portion 10 and the coil portion 301 facing each other with the spacer 20 interposed therebetween, is performed at the top of the target portion 10. It varies according to the touch operation, and the magnitude of the inductance generated between the target unit 10 and the coil units 301 and 302 varies according to the change in the interval.

At least one coil unit 301 and 302 positioned under the spacer 20 has the same configuration.

In FIG. 1, as an example, two coil units 301 and 302 are sequentially stacked along the vertical direction of the touch sensor module 1, but the present invention is not limited thereto, and only one coil unit 301 exists or three The above coil units may be sequentially stacked in the vertical direction.

In this case, when the plurality of coil units 301 and 302 are sequentially stacked, an adhesive layer for bonding separate coil units may exist between the adjacent two coil units 301 and 302.

These coil units 301 and 302 are located on the upper and lower surfaces of the substrates 11 and 21 made of a single-sided printed circuit board, a double-sided printed circuit board, or a multilayer printed circuit board, respectively. The coils 121-124, 131-134, 221-224, and 231-234 are provided.

The upper coils 121-124 and 221-224 positioned on the upper surfaces of each of the substrates 11 and 21 are upper and left along the left and right directions (ie, the extension direction) (eg, the first direction) of the substrates 11 and 21. The lower coils 131-131 and 231-234, which are arranged side by side and spaced apart from each other on the surface, are also spaced parallel to the lower surface along the extending direction of the substrates 11 and 21. Are being arranged.

At this time, one upper coil (121-124) and one lower coil (131-134) correspond to each other at a position corresponding to the vertical direction (eg, the second direction) with the substrates 11 and 12 interposed therebetween. Located. The first direction and the vertical direction, which are the left and right directions, cross each other, and more specifically, orthogonal to the second direction.

As shown in FIG. 2, the plurality of upper coils 121-124 and lower coils 131-134 positioned on the corresponding substrate (eg, the first substrate 11) are a conductive pattern such as a single conductor or a copper pattern. The two coils (e.g., 121, 122) have opposite winding directions in the coil arrangement direction, but the two coils (e.g., 121, 122) correspond to each other in the vertical direction with the substrate 11 interposed therebetween. The winding directions of 131) are the same.

As in this example, when two or more coil units 301 and 302 are sequentially stacked in the vertical direction of the touch sensor module 1, all coil units 301 and 301 may be formed in a conductive pattern such as a single conductor or a copper pattern. 303) of the coil is formed.

In this case, the winding directions of the plurality of upper coils 121-124 and 221-224 and lower coils 131-134 and 231-234 positioned on the same axis of each of the substrates 11 and 21 along the vertical direction are also All the same.

When the touch sensor module 1 includes two or more coil units 301 and 302, the substrates 11 and 21 on which the coil units 301 and 302 are located may be separate and separate substrates. .

As an example, referring to FIG. 2, four upper coils 121 along the left and right directions from one edge (eg, left edge) to the other edge (eg, right edge) on the upper and lower surfaces of the first substrate 11 -124) and the process of forming the four lower coils 131-134 will be described.

The conductive pattern L11 located at the outermost (eg, leftmost) is wound in a predetermined shape such as a circle or a rectangle in the first winding direction (eg, clockwise) from the outside to the center on the upper surface of the first substrate 11 After the first upper coil 121 is formed, the conductive pattern L11 moves from the center of the first upper coil 121 to the lower surface of the first substrate 11 through a via hole or the like. .

Then, the conductive pattern L11 is again wound in a shape determined outward from the corresponding lower surface of the first substrate 11 to form the first lower coil 131.

Next, the conductive pattern L11 extends in a right direction, which is an extension direction of the lower surface of the first substrate 11, and then a second winding direction opposite to the winding direction of the adjacent first lower coil 131 ( Yes, as it is wound in a counterclockwise direction), the second lower coil 132 is formed by winding it from the outside to the center of the first substrate 11, and then through a via hole or the like at the center of the second lower coil 132. It extends to the upper surface of the first substrate 11.

Then, the conductive pattern L11 is again wound counterclockwise from the center of the upper surface of the first substrate 11 in an outward direction to complete the second upper coil 122, and again, the conductive pattern L11 is the first After extending in the extending direction of the upper surface of the substrate 11, it corresponds to the upper and lower surfaces of the first substrate 11 in the same manner as the method of forming the first upper coil 121 and the first lower coil 131 The third upper coil 123 and the second lower coil 133 are formed.

Then, after the conductive pattern L11 moves to the lower surface of the substrate 11 again, the fourth lower coil 134 and the fourth upper coil 124 are attached to the lower surface and the upper surface of the substrate 11. By forming the first coil part 301 is manufactured.

Accordingly, by connecting the inductance sensors 500 to both ends of the conductive pattern, an electric signal having a corresponding size is output according to the inductance, so that it is possible to determine whether a touch has occurred.

When the second coil unit 302 is positioned on the first coil unit 301, a plurality of upper coils 22 and a plurality of After forming the lower coil 23, after placing the second coil unit 302 under the first coil unit 301, the conductive pattern L11 and the second nose positioned on the first coil unit 301 are At least one of the conductive patterns positioned on the portion 302 is extended so that electrical and physical connections are made to each other.

In this way, the plurality of coils 121-124, 131-134, 221-224, 231-234 positioned on the first substrate 11 and the second substrate 21 are connected seamlessly with one conductor or a conductive pattern ( L11).

At this time, the coils 121-124, 131-134, 221-224, 231-234 formed on the corresponding substrates 11 and 21 are formed in a pattern shape on the corresponding substrates 11 and 21 using printed circuit technology. , The number of coils (121-124, 131-134, 221-224, 231-234) formed on each substrate (11, 21) and the number of windings can be conveniently changed according to the needs of the user. The size and weight of the touch sensor module 1 do not significantly increase.

In addition, when a plurality of coils are generally formed on one substrate 11 and 21 having a rectangular planar shape, the number of coil windings is limited due to a size limitation of at least one of a horizontal width and a vertical width.

However, the total number of windings of the touch sensor module 1 can be easily increased by continuously arranging separate substrates on which a plurality of coils are located in the vertical direction.

For this reason, it is easy to improve the sensitivity and reliability of operation of the touch sensor module 1.

In this way, the upper and lower surfaces of the substrates 11 and 21 on which the upper coils 121-124 and 221-224 and the lower coils 131-134 and 231-234 are located are formed by using epoxy or the like. Molded parts 14 and 24 may be molded.

In this case, since the coils 121-124, 131-134, 221-224, 231-234 are completely buried in the molding parts 14 and 24, they are safely and firmly applied on the corresponding substrates 11 and 12. Coils 121-124, 131-134, 221-224, and 231-234 are located.

As described above, compared to the comparative example in which one coil is formed on one substrate, a plurality of coils are formed on one substrate having the same area as the substrate of the comparative example, so that the total number of coil windings and the length of the coil (i.e., Length), greatly increasing the magnitude of the generated magnetic field.

Due to the increase in the magnitude of the magnetic field, the magnitude of the inductance generated in the plurality of first and second coil units 301 and 302 is also increased, and the variation width of the inductance (Δ inductance) generated in the touch sensor module 1 is also increased. do. Therefore, the touch sensitivity of the touch sensor module 1 is greatly increased.

In addition, as the impedance increases due to the increase in inductance, a level above the minimum voltage for frequency oscillation is secured, so that the frequency oscillation of the touch sensor module 1 is stably output.

With reference to [Table 1] below, look at the width of change in inductance depending on the number of coil windings.

At this time, in [Table 1] below, the number of substrates is two, and a predetermined number of coils are located on the upper and lower surfaces of each substrate. In the first case, one coil is formed on the upper and lower surfaces of each substrate, and in the second case, four coils are formed on the upper and lower surfaces of each substrate.

Total number of coil turns (number of coil turns × total number of coils)	Air gap (mm)	Inductance (uF)	△ Inductance (distance 0.1~0.3mm)
3×4=12	0.1	0.45	0.3
	0.2	0.62
	0.3	0.75
6×16=96	0.1	1.92	1.08
	0.2	2.53
	0.3	3

As shown in [Table 1] above, when one coil is provided on each of the upper and lower surfaces of the first and second substrates, the total number of coils formed on both the first and second substrates is 4 The total number of coil windings formed on the first and second substrates is 12. In this case, as shown in [Table 1], the variation width of the inductance was 0.3. Four coils were formed in series on the upper and lower surfaces of the first and second substrates, respectively, so that the total When 16 coils were formed, the total number of coil windings increased to 96. In this case, it can be seen that the variation in inductance increases significantly to 1.8.

As described above, as the number of windings of the total coil increases, the variation in inductance increases, so that the accuracy of the operation of the touch sensor module 1 increases.

Next, a touch sensor module 1a according to another embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 is a conceptual cross-sectional view of a touch sensor module according to another embodiment of the present invention, and FIG. 4 is a diagram in which an upper coil part and a lower coil part are formed on a first substrate and a second substrate, respectively, in the touch sensor module shown in FIG. It is a diagram schematically showing an example.

Compared with FIG. 1, components having the same structure and performing the same function are denoted by the same reference numerals as in FIG. 1, and detailed descriptions thereof will be omitted.

As shown in FIG. 3, the touch sensor module 1a is a gap in which the object to be touched is located under the target part 10, the upper coil part 10a located under the target part 10, and the upper coil part 10a. The first and second adhesive layers 401 and 403 are respectively located on the upper and lower surfaces of the material 20, at least one lower coil part 30a located under the spacer 20, and the spacer 20 , A first electromagnetic shielding film 501 positioned between the target portion 10 and the upper coil portion 10a, a second electromagnetic shielding film 502 positioned below the lower coil portion 30a, and a first electromagnetic shielding film 501 And a third adhesive layer 601 positioned between the upper coil portion 10a and the second adhesive layer 602 positioned between the lower coil portion 30ㅁ and the second electromagnetic shielding film 502.

Compared with the touch center module 1 shown in FIG. 1, the touch sensor module 1a of this example is located above the spacer 20 and faces the lower coil part 30a from the upper coil part ( 10a) and first and second electromagnetic shielding films 501 and 502 respectively positioned above the upper coil part 10a and below the lower coil part 30a are provided.

In addition, similar to the touch sensor module 1a of FIG. 1, adhesive layers 401, 402, 601, and 602 are provided for bonding between adjacent components.

At this time, since the upper coil part 10a located on the upper side of the upper coil part 10a and the lower coil part 30a is located more adjacent to the outside, it receives pressure when a user touches it. Accordingly, the upper coil part 10a located at the top of the upper coil part 10a and the lower coil part 30a functions as a target metal that is affected by the user's touch operation, and the upper coil part 10a ) And functions as a target part.

Accordingly, the degree of bending of the substrate 11a changes according to the degree of physical force applied from the outside on the substrate 11a of the upper coil unit 10a, and when the applied physical force is removed, the spacer 20 The upper coil part 10a is restored to its initial state by elasticity.

In a state in which a magnetic field is formed in the upper coil part 10a and the lower coil part 30a by applying AC power to each coil of the upper coil part 10a and the lower coil part 30a connected by a single conductor or a conductive pattern. , When the distance between the upper coil part 10a and the lower coil part 30a corresponding to each other changes according to the position change of the upper coil part 10a, it occurs between the upper coil part 10a and the lower coil part 30a. The size of the inductance to be performed changes. The change in inductance according to the change in the distance between the upper coil unit 10a and the lower coil unit 30a corresponding to each other is detected by the inductance sensor, as described above.

Therefore, the inductance sensor detects whether the touch sensor module 1a is touched by detecting the degree of force applied to the upper coil unit 10a, that is, the degree of being pressed in the Z-axis direction using the size of the detected inductance. Is done.

As already described, the winding directions of the coils 121a-124a and 131a-134a located in the upper coil part 10a are all the same, and all coils 221-224a and 231a- located in the lower coil part 30a The winding direction of 234a) is also the same.

In addition, the coil winding direction of the upper coil part 10a and the coil winding direction of the lower coil part 30a are the same.

Next, an example of forming the upper coil part 10a and the lower coil part 30a will be described with reference to FIG. 4.

As shown in FIG. 4, the upper coil part 10a and the lower coil part 30a are each arranged in the same shape as that shown in FIG. 2.

That is, the winding directions of the coils adjacent to each other in the first direction on the same substrate 11a and 21a are opposite to each other, and the winding directions of the coils facing each other with the respective substrates 11a and 21a interposed therebetween are the same.

In addition, the winding directions of all coils corresponding to each other by being positioned on the same axis with the spacer 20 interposed therebetween are the same.

Accordingly, the conductive pattern L21 located on the leftmost side to form the upper coil part 10a is wound in a shape determined from the outside to the center part on the upper surface of the first substrate 11a, and the first coil of the first upper coil After forming 121a, the conductive pattern L21 moves from the center of the coil 121a to the lower surface of the first substrate 11a through a via hole or the like.

Then, the conductive pattern L21 is again wound in a shape determined outward from the corresponding lower surface of the first substrate 11a to form the first coil 131a of the first lower coil.

Next, the conductive pattern L21 extends in the right direction, which is the extension direction of the lower surface of the first substrate 11a, and is then wound back to the center of the first substrate 11a according to a predetermined shape. After the second coil 132a is formed, it extends to the upper surface of the first substrate 11a through a via hole or the like.

Then, the conductive pattern L21 is wound outward toward the center of the upper surface of the first substrate 11a to form the second coil 122a of the first upper coil.

After the conductive pattern L21 extends in the extending direction of the upper surface of the first substrate 11a, a method of forming the first coil 121a of the first upper coil and the first coil 131a of the first lower coil Likewise, a third coil 123a of the first upper coil and a third coil 133a of the first lower coil are formed on the upper and lower surfaces of the first substrate 11a.

Finally, the conductive pattern L21 moves in the extending direction of the lower surface of the first substrate 11a, and then the second coil 132a of the first lower coil and the second coil 122a of the first upper coil are In the same manner as the formation method, the fourth coil 134a of the first lower coil and the fourth coil 124a of the first upper coil are formed on the lower and upper surfaces of the first substrate 11a to form the upper coil part 10a. Is completed.

As described above, the formation of the plurality of first upper coils 121a-124a and the first lower coils 131a-134a spaced apart from the same substrate 11a along the extension direction of the substrate 11a is the conductive pattern L21. ) May be formed by moving to the upper and lower surfaces of the substrate 11a.

Accordingly, all of the first upper coils 121a-124a and the first lower coils 131a-134a positioned on the first substrate 11a consist of a single conductive line or conductive pattern L11 connected seamlessly.

In addition, since the winding directions of the first upper coils 121a-124a and the first lower coils 131a-134a are the same, current is applied to the conducting wire or the conductive pattern L21 for the operation of the touch sensor module 1a. When this occurs, the direction of the current flowing through all the coils 121a-124a and 131a-134a of the upper coil part 10a is also the same,

In order to form the lower coil part 30a, a corresponding conductive pattern L31 is formed on the substrate 21a in a desired winding direction and shape in the same manner as the upper coil part 10a, and the second upper coil 221a- 224a) and second lower coils 231a-234a are formed.

Then, the spacer 20 is positioned between the upper coil part 10a and the formed lower coil part 30a. Then, a conductive pattern is formed on the upper coil part 10a and the lower coil part 30a by using at least one of the first and second substrates 11a and 21a and a via hole penetrating through the spacer 20. One end of the L21 and L31 is connected to each other, and an inductance sensor is connected to the other end of the conductive patterns L21 and L31 that are not connected to each other, thereby completing the upper coil part 10a and the lower coil part 30a.

As already described with reference to FIG. 1, the number of windings of each of the coils 121a-124a, 131-134a, 221-224a, 231a-234a formed in the upper coil part 10a and the lower coil part 30a is adjusted. Accordingly, the magnitude of the magnetic field generated by the upper coil part 10a and the lower coil part 30a may be increased. For this reason, the amount of change in inductance is greatly increased according to the change in the distance between the upper coil unit 10a and the lower coil unit 30a, thereby improving the sensitivity of the touch sensor module 1a.

In addition, in this example, between the upper coil part 10a and the lower coil part 30a in a state in which an alternating current is applied to the upper coil part 10a and the lower coil part 30a that are adjacent to each other in opposite directions. As the interval decreases, the magnitude of the generated frequency decreases, but the generated inductance increases. As the distance between the upper coil unit 10a and the lower coil unit 30a increases, the inductance generated decreases.

The first electromagnetic shielding film 501 positioned above the upper coil portion 10a and the second electromagnetic shielding film 502 positioned below the lower coil portion 30a are each a target portion positioned above the upper coil portion 10a ( 10) It performs an electromagnetic shielding function with a metal plate 700 such as a circuit board or a battery positioned under the lower coil unit 30a, and may be formed in a film form.

In general, there is a member in at least one of the upper coil part 10a and the lower coil part 30a in which eddy current is generated by the operation of the upper and lower coil parts 10a and 30a, such as metal plates 10 and 700 If so, the inductance generated in the coils 12, 13, 22, and 23 is affected by being positioned in the corresponding coil units 10a and 30a.

Therefore, when an eddy current occurs in members other than the component for sensing the user's touch motion, the inductance generated in the coil decreases regardless of the user's touch motion, and the inductance sensor cannot detect the correct touch state. Reduce the sensitivity of the touch sensor module.

However, in the case of the present example, since the first and second electromagnetic shielding films 501 and 502 exist between the metal plates 10 and 700 and the upper and lower coil parts 10a and 30a, the metal plates 10 and 700 The generation of eddy current is suppressed so as not to affect the operation of the upper and lower coil units 10a and 30a.

Therefore, the inductance sensor of the touch sensor module 1a accurately detects the amount of change in inductance according to the touch degree of the touch sensor module 1a without the influence of the eddy current occurring in the metal plates 10 and 700 located at the top or bottom, and is generated. The magnitude of the inductance to be obtained also does not decrease.

In an alternative example, when at least one of the metal plates 10 and 700 is omitted, the corresponding electromagnetic shielding films 501 and 502 may also be omitted.

It is natural that these electromagnetic shielding films 501 and 502 can also be applied to the touch sensor module 1 of FIG. 1.

In the touch sensor module 1a, an upper coil part 10a and a lower coil part 30a are respectively located at the upper and lower parts with the spacer 20 as the center, so that the upper coil part 10a and the lower coil part ( 30a) A user's touch motion performed on one of the above is detected.

As such, since one of the upper coil part 10a and the lower coil part 30a (eg, the upper coil part 10a) functions as a target metal on which the user's touch operation is performed, the metal on the upper part of the touch sensor module 1a A separate target portion 10 made of may be omitted. In this way, when the target portion 10 is omitted, the upper coil portion 10a becomes a target portion and functions as a target portion.

Therefore, since a separate target metal is not required, it is much easier to secure an installation location for installing the touch sensor module 1a. In addition, since the material of the component, which is made of metal such as the outer case, which adversely affects the electromagnetic operation of the product, can be changed to a non-conductive material, the reliability of the operation of the product is improved and the product is lightweight.

In particular, in the case of a 5G antenna used in a smartphone, etc., a problem occurs in that the 5G antenna performance is greatly degraded due to metallic materials located around it.

However, in the case of this example, since a separate target metal made of metal is unnecessary, the performance of the 5G antenna is not reduced. Also, due to the electromagnetic shielding films 501 and 502, noise generated by the operation of the antenna is prevented from adversely affecting the operation of the touch sensor module 1.

In addition, in the case of a touch sensor module using eddy current generated in the target metal according to the change in the distance between the target metal and the coil unit (eg, 30a) located in the opposite direction of the target metal by providing a separate target metal, The inductance generated decreases as the distance between the corresponding coils (that is, the air gap) gets closer, while the upper coil part 10a in this example using the upper coil part 10a as a target metal as already described. The inductance increases as the distance between the and the lower coil part 30a becomes closer.

In the above, embodiments of the touch sensor module of the present invention have been described. The present invention is not limited to the above-described embodiments and the accompanying drawings, and various modifications and variations are possible from the perspective of those of ordinary skill in the field to which the present invention belongs. Therefore, the scope of the present invention should be defined by the claims of the present specification as well as those equivalent to the claims.

1, 1a: touch sensor module 10, 10a: target part

20: spacer 11, 11a: first substrate

21, 21a: second substrate 121-124, 121a-124a: first upper coil

131-134, 131a-134a: first lower coil

221-224, 221a-224a: second upper coil

231-234, 231a-234a: second lower coil

10a: upper coil part 30a: lower coil part

401, 402, 601, 602: adhesive layer 501, 502: electromagnetic shielding film

Claims (19)

1. In the touch sensor module,

   Spacer;

   A target portion positioned above the spacer and formed of a conductive material; And a plurality of first coils positioned under the spacer, arranged side by side in a first direction on a first substrate and on the first substrate, and coils adjacent in the first direction are wound in opposite directions.

   Including,

   As the distance between the target part and the coil part changes, the inductance of the target part and the coil part changes,

   The touch sensor module detects a change in the inductance

   Touch sensor module.
2. The method of claim 1,

   The plurality of first coils are positioned on at least one of an upper surface and a lower surface of the first substrate.
3. The method of claim 2,

   The touch sensor module in which the winding direction of each of the first coils positioned on the same surface of the first substrate is opposite to that of adjacent first coils.
4. The method of claim 2,

   When the plurality of first coils are located on the upper and lower surfaces of the first substrate, windings of the first coils facing each other in a second direction orthogonal to the first direction with respect to the first substrate Touch sensor modules with the same direction.
5. The method of claim 1,

   A plurality of second coils stacked on the coil unit in a second direction orthogonal to the first direction under the spacer, arranged in the first direction on the second substrate and the second substrate, and arranged side by side. Additional coil unit provided

   Touch sensor module further comprising a.
6. The method of claim 5,

   The winding direction of the additional coil part is the same as the winding direction of the coil part.
7. The method of claim 5,

   The plurality of second coils are located on at least one of an upper surface and a lower surface of the second substrate.
8. The method of claim 7,

   The touch sensor module in which the winding direction of the second coil positioned on the same surface of the second substrate is opposite to that of the adjacent second coil.
9. The method of claim 7,

   When the plurality of second coils are located on the upper and lower surfaces of the second substrate, windings of the second coils facing each other in a second direction orthogonal to the first direction with the second substrate as the center Touch sensor modules with the same direction.
10. The method according to any one of claims 1 to 9,

    The target portion is a metal plate touch sensor module.
11. The method of claim 10,

    An electromagnetic shielding film located under the target part

    Touch sensor module further comprising a.
12. The method of claim 1,

    The target unit includes a second substrate and a plurality of second coils arranged parallel to each other in the first direction on the second substrate.
13. The method of claim 12,

    The plurality of second coils are located on at least one of an upper surface and a lower surface of the second substrate.
14. The method of claim 13,

    The touch sensor module in which the winding direction of the second coil positioned on the same surface of the second substrate is opposite to that of the adjacent second coil.
15. The method of claim 13 or 14,

    When the plurality of second coils are located on the upper and lower surfaces of the second substrate, windings of the second coils facing each other in a second direction orthogonal to the first direction with the second substrate as the center Touch sensor modules with the same direction.
16. The method of claim 13 or 14,

    Each second coil is a touch sensor module facing each first coil along a second direction orthogonal to the first direction.
17. The method of claim 1,

    An electromagnetic shielding film positioned at least one of an upper portion of the target portion and a lower portion of the coil portion

    Touch sensor module further comprising a.
18. The method of claim 1,

    The spacer is a touch sensor module in the form of a flat plate positioned between the target part and the coil part.
19. The method of claim 18,

    The spacer is a touch sensor module made of polyethylene, polyurethane, or polyolefin.

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