KR20140049300A - Tablet with improved power coil - Google Patents

Tablet with improved power coil Download PDF

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Publication number
KR20140049300A
KR20140049300A KR1020120115403A KR20120115403A KR20140049300A KR 20140049300 A KR20140049300 A KR 20140049300A KR 1020120115403 A KR1020120115403 A KR 1020120115403A KR 20120115403 A KR20120115403 A KR 20120115403A KR 20140049300 A KR20140049300 A KR 20140049300A
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KR
South Korea
Prior art keywords
pattern
power coil
electronic pen
power
electromagnetic force
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KR1020120115403A
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Korean (ko)
Inventor
유영기
Original Assignee
주식회사 더한
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Priority to KR1020120115403A priority Critical patent/KR20140049300A/en
Publication of KR20140049300A publication Critical patent/KR20140049300A/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Electromagnetism (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Aerials (AREA)

Abstract

The present invention relates to a tablet with an improved power coil pattern which is distributed on an electronic pen sensing area capable of storing induced energy by external electromagnetic force with a resonance circuit and of sensing the position of an electronic pen which emits acting electromagnetic force. The present invention comprises a line antenna circuit pattern which senses the acting electromagnetic force emitted by the electronic pen; a power coil which emits the external electromagnetic force by inputted AC power; a coil driving driver which outputs the AC power of a predetermined frequency by using the power coil; and a coordinate sensing circuit which controls the operation of the coil driving driver and calculates the coordinate of the electronic pen in the electronic pen sensing area. The pattern of the power coil is made up of a whirlpool shape having one or more turns which are wound on a part of the electronic pen sensing area.

Description

Tablet with improved shape coil pattern {TABLET WITH IMPROVED POWER COIL}

The present invention relates to a tablet having an improved form of power coil pattern, and more particularly, to a tablet having an improved form of power coil capable of efficiently emitting evenly electromagnetic force over the entire range of the electronic pen sensing area. will be.

As a device for inputting coordinates using a conventional non-powered electronic pen, there is a Korean Patent No. 10-910348 (hereinafter, referred to as a conventional document).

In this conventional document, a power coil 310 is disposed to surround an area composed of a plurality of line antennas and a loop antenna. When an AC voltage is applied to the power coil 310, an electromagnetic force generated in the power coil is generated. By reaching the resonant circuit 210 of the pointer 200, the resonant circuit 210 generates the induced energy, so that even if the power coil 310 stops the emission of electromagnetic force, the pointer 200 itself for a predetermined time. Disclosed is a tablet 300 capable of emitting electromagnetic forces, such that the line and loop antennas operate on the principle of sensing the electromagnetic forces emitted by the pointer 200 (see FIG. 1).

On the other hand, the power coil 310 is configured to surround the outer periphery of the area for detecting the position of the pointer 200. According to this configuration, since the power coil 310 is close to the outer circumferential portion of the region, a large electromagnetic force can be received at the pointer 200, but is separated from the power coil 310 at the inner portion of the region. Electromagnetic force is applied.

Therefore, there is a problem that the coordinate sensing performance by the non-powered pointer 200 is not constant in the region because the electromagnetic force does not act evenly at each position of the region.

In addition, since the power coil 310 is formed outside the area for detecting the pointer, if the number of turns is increased or the thickness of the coil is thickened to improve the electromagnetic force emitted from the power coil 310, The outer part of the region must be expanded or rather the region must be reduced.

Therefore, the tablet is mounted on the surface of the display device and used as a touch screen. Since the outer portion of the area corresponds to the bezel area of the display device, the conventional power coil structure as described above is intended to minimize the bezel area. It has a problem that it cannot cope with the recent trend.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problem, and an object of the present invention is to provide an improved power coil structure in which electromagnetic force emitted from a power coil is uniform at all positions within an electronic pen sensing region capable of sensing a position of the electronic pen.

In addition, it is intended to efficiently arrange the power coil while minimizing the bezel area around the outer periphery of the electronic pen sensing area.

A tablet having an improved form of power coil pattern according to the invention for achieving the above object comprises a resonant circuit having at least an inductor and a capacitor to store energy induced by external electromagnetic forces and also act by the stored energy. A line antenna circuit pattern distributed in an electronic pen detecting region, which is an area capable of detecting a position of the electronic pen emitting electromagnetic force, and sensing an operating electromagnetic force emitted from the electronic pen to output an induced current; A power coil for emitting the external electromagnetic force by the AC power input; A coil drive driver for outputting the AC power of a predetermined frequency to the power coil; A coordinate sensing circuit for controlling an AC power output operation of the coil driving driver and calculating coordinates of the electronic pen in the electronic pen sensing region based on the induced current sensed by the line antenna circuit pattern, wherein The pattern of the power coil may be configured in a vortex shape having one or a plurality of turns wound in a form overlapping at least a portion of the electronic pen sensing region.

The line antenna circuit pattern may include: a closed loop type loop antenna connected to ground and forming a circumference of the electronic pen sensing region; And parallel to each other in a comb shape in the closed loop shape of the loop antenna, one end of which is electrically connected to the loop antenna and the other end of which flows out of the electronic pen sensing region across the loop antenna in an insulated state. A line selection circuit including a plurality of outgoing line antennas, wherein the coordinate sensing circuit is coupled to the other ends of the plurality of line antennas and selects one of the other ends of the plurality of line antennas and sets it as a differential output; And a differential amplifier for outputting a potential difference between the differential output and the ground.

In addition, the pattern of the power coil is characterized in that the density of the wound pattern is changed from the inside of the vortex to the outside, or from the outside of the vortex to the inside.

In addition, the pattern of the power coil is characterized in that the winding density of the pattern is increased as the inner side of the vortex form and the outer side of the vortex form.

The electronic pen sensing region is divided into a plurality of small regions, and the pattern of the power coil is formed for each of the small regions as one continuous pattern.

In addition, each of the small region is set so as to partially overlap with each other, wherein the vortex form of the pattern of the power coil of each of the small region is characterized in that overlapping each other.

In addition, the pattern of the power coil is formed by printing a conductive material on both sides of the film-like substrate, the conductive material on both sides of the substrate, it characterized in that it is electrically connected to each other through a via hole through the substrate do.

The electronic pen having the improved power coil pattern form according to the present invention having the above-described configuration has a uniform electromagnetic force emitted from the power coil at all positions within the electronic pen sensing region capable of detecting the position of the electronic pen. The strength of the electromagnetic force emitted by the electronic pen is high enough to improve the accuracy and accuracy of position sensing.

In addition, even if the bezel area, which is the outer circumference of the electronic pen sensing area, is minimized, a power coil capable of emitting sufficient electromagnetic force may be implemented.

1 is a view showing the structure of a power coil in a tablet according to the prior art.
2 is a view showing the configuration of a tablet according to the present invention.
3 is a view showing an improved form of a power coil pattern according to an embodiment of the present invention.
4 is a diagram illustrating an example in which a power coil and a line antenna circuit pattern according to the present invention are combined.
5 is a view showing a modification of the power coil pattern form according to the present embodiment.
6 shows an improved form of power coil pattern according to another embodiment of the invention.
7 is a diagram showing an example of forming a power coil pattern on one substrate.
8 and 9 show another example of an improved form of power coil pattern according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

2 is a view showing the configuration of a tablet according to the present invention. Referring to the drawings, the tablet according to the present invention is configured to operate together with the electronic pen 5, the line antenna circuit pattern 20, the power coil 30, the coil drive driver 40, and the coordinate detection Circuit 50.

The electronic pen 5 includes a resonant circuit having at least an inductor and a capacitor, and stores energy induced by an electromagnetic force (external electromagnetic force) acting on the resonant circuit, and also by itself stored electromagnetic force (acting electromagnetic force). It is configured to emit.

The line antenna circuit pattern 20 is evenly distributed in this area to form a virtual electronic pen detection area A, which is an area where the position of the electronic pen 5 can be detected, and is emitted from the electronic pen 5. It is configured to sense the acting electromagnetic force to output the induced current.

The power coil 30 emits external electromagnetic force by the input AC power.

The coil drive driver 40 rectifies the external power supply to a desired voltage / current, and then supplies the AC power having a predetermined frequency to the power coil 30 in accordance with an input control signal, thereby causing the power coil 30 to have a predetermined frequency. To emit external electromagnetic force.

The coordinate sensing circuit 50 outputs a control signal for controlling the AC power output operation of the coil driving driver 40, and further, based on the induced current sensed by the line antenna circuit pattern 20, in the electronic pen sensing region. The coordinates of the electronic pen 5 at s are calculated and output as digital / analog information. In order to provide such a function, the coordinate sensing circuit 50 may include an MCU 56.

Further, the line antenna circuit pattern 20 is a loop antenna 10 which is connected to ground and has a closed loop shape that forms a circumference of the electronic pen sensing region A, and a closed loop shape of the loop antenna 10. It is arranged parallel to each other in the shape of a comb in the interior and one end is electrically connected to the loop antenna 10 and the other end is insulated from the loop antenna 10 to the outside of the electronic pen detection area (A) across the closed loop shape. It includes a plurality of line antenna 20 configured to flow out.

In addition, the coordinate sensing circuit 50 has the other ends of the plurality of line antennas 20 coupled to each other, and a line selection circuit 52 for selecting one of the other ends of the plurality of line antennas 20 and setting it as a differential output. And a differential amplifier 54 for outputting a potential difference between the selected differential output and the ground to which the loop antenna 10 is connected. The potential difference of the differential amplifier 54 is provided to the MCU 56 and used for the coordinate calculation of the electronic pen.

The present invention to provide a tablet having an improved form of the power coil pattern, by improving the shape of the power coil disposed to surround the electronic pen sensing region, it is possible to achieve the above-described effect. The power coil 30 may be in the form of a coil formed by winding a conductive wire coated with a conductive material (for example, metal), but in the present invention, a pattern in which a conductive material is printed in one layer or multiple layers on a substrate is used. It demonstrates as what uses and comprises. When the pattern of the power coil 30 is formed by printing in this way, the manufacturing method of the power coil is simple, and the yield and cost advantages can be expressed.

First, the improved form of the power coil pattern according to an embodiment of the present invention will be described with reference to FIGS.

3 is a view illustrating an improved form of a power coil pattern according to an embodiment of the present invention, in which the power coil pattern 30 is turned once or multiple times around a certain point inside the electronic pen sensing region A. Referring to FIG. It turns out to show that it is composed of a swirling form that goes outward.

According to the power coil pattern 30, since the power coil 30 is disposed to the inside of the electronic pen sensing region A, the inner side near the center as well as the outer circumferential portion of the electronic pen sensing region A is disposed. In this case, the external electromagnetic force can be released sufficiently efficiently.

4 (a) and 4 (b) show an example in which a power coil as shown in FIG. 3 is combined with a line antenna circuit pattern. 4 (a) is a diagram showing the configuration of the loop antenna 10 and the line antenna 20. The line antenna circuit pattern includes a plurality of loop antennas 10 forming the electronic pen sensing region A and extending in the vertical (Y axis) direction of the loop antenna 10 and arranged in the horizontal (X axis) direction. The X-axis line antenna 20X and the Y-axis line antenna 20Y extending in the horizontal axis direction and arranged in plural in parallel in the vertical axis direction are included.

FIG. 4 (b) shows a state in which the power coil pattern 30 of the form shown in FIG. 3 is coupled to the line antenna circuit pattern as shown in FIG. 4 (a). According to the power coil pattern according to an embodiment of the present invention, the power coil 30 may be evenly distributed over the entire range of the electronic pen sensing region A in which the line antenna circuit pattern is distributed.

In the tablet according to the present invention, at least the electronic pen sensing region A is configured to be transparent and arranged on the display surfaces of various display devices. To this end, at least the line antenna circuit pattern 20 is preferably formed of a transparent conductive material on a transparent substrate (not shown). For example, the transparent substrate may be PET, and the line antenna circuit pattern may be formed by printing ITO.

Similarly, the power coil according to the present invention may also be formed by a printing method of a transparent conductive material such as ITO. FIG. 4B illustrates a form in which any transparent substrate on which a line antenna circuit pattern is formed and a transparent substrate on which a power coil pattern is formed in the same manner as in FIG. 3 overlap. Of course, one transparent substrate may be prepared, the circuit pattern of the line antenna 20 may be formed on one side, and the pattern of the power coil 30 may be formed on the opposite side.

In the present invention, both the pattern and the substrate on which the pattern is formed are described as being transparent, but in the drawings and the following drawings, each pattern is illustrated by colored solid lines for understanding.

5 is a view showing a modification of the power coil pattern form according to the present embodiment. 5 (a) illustrates that the power coil pattern constitutes a plurality of turns in the outer circumference portion of the electronic pen sensing region, and reduces the number of turns toward the inside of the electronic pen sensing region. That is, in the vortex of the power coil pattern, the distance (density) between one turn of the pattern and the next turn increases as the distance from the inside of the vortex to the outside increases.

In addition, FIG. 5 (b) shows a form in which the density of the number of turns is increased as the pattern of the power coil enters inward from the outer peripheral portion of the electronic pen sensing region.

In addition, FIG. 5 (c) shows a form in which the density of the power coil is increased as it enters the inner portion of the electronic pen sensing region and toward the outer circumferential portion.

As such, the density of the power coil pattern can be increased or decreased in a variety of ways, and in such a way that, depending on the shape and size of the electronic pen sensing region, a uniform external electromagnetic force can be emitted at all parts of the electronic pen sensing region. Can be set.

Next, referring to FIGS. 6 and 7, another example of an improved form of power coil pattern according to the present invention will be described. FIG. 6 is a diagram illustrating an improved power coil pattern according to another embodiment of the present invention. The electronic pen sensing region is divided into a plurality of small regions, and a power coil pattern is configured for each divided small region. At this time, each of the power coil patterns configured in each small region are all connected to be one continuous pattern.

Meanwhile, as illustrated in FIG. 6B, the power coil pattern formed in each small region may be configured to have a plurality of turns. As described above, the power coil pattern formed in each of the small regions may be modified in various forms such that the emitted electromagnetic force may be uniformly displayed on the entire surface of the electronic pen sensing region.

In addition, in FIG. 6 (b), although the patterns of each of the small regions are shown wound and wound along an edge, the patterns of the shapes shown in FIGS. 3 and 5 may be formed for each of the small regions.

FIG. 7 is a view showing an example of forming a power coil pattern on one substrate as shown in FIG. That is, FIG. 7 illustrates an example in which the power coil pattern 30 of the present invention is formed on one surface of one substrate S and the line antenna circuit pattern is formed on the opposite surface of the substrate S. Referring to FIG.

Referring to the drawing, the electronic pen sensing region A is divided into four small regions, and the power coil pattern 30 in each small region is turned by turning the edge of the small region once. In addition, a part of the power coil pattern 30 is formed on one side of the substrate, the other part is formed on the opposite side of the substrate (S), and each pattern is connected through the via hole (V).

In the drawing, the solid line represents the pattern formed on one side of the substrate S, and the dotted line represents the pattern formed on the opposite side of the substrate S.

According to such a structure, since the power coil pattern 30 is not formed in the center part of one side surface of the board | substrate S, the circuit pattern of the line antenna 20 can be comprised in this part, and one board | substrate ( In S), the circuit pattern of the line antenna 20 and the power coil 30 can be formed simultaneously (detailed illustration is omitted).

FIG. 8 shows another example of an improved power coil pattern according to the present invention, and shows a form in which each of the plurality of small regions formed by dividing the electronic pen sensing region is partially overlapped with each other. In this way, if each of the small regions overlap each other and a pattern having one or more turns is formed along the edge of each small region, a region in which the patterns of the power coils overlap with each other generally occurs. This structure eliminates the gap between the electromagnetic forces emitted by the power coils formed in each adjacent small region.

9 shows another reference example of the improved type power coil pattern according to the present invention, wherein the pattern of the power coil inside the electronic pen sensing region has a plurality of circular or polygonal shapes having random shapes and centers. Show that it consists of. As such, the pattern of the improved power coil according to the present invention can be implemented to have various shapes, positions, and sizes.

Claims (7)

It is distributed in the electronic pen detection area, which is an area capable of detecting the position of the electronic pen which stores energy induced by external electromagnetic force and includes a resonant circuit having at least an inductor and a capacitor and emits a working electromagnetic force by the stored energy. A line antenna circuit pattern configured to output an induced current by sensing an operating electromagnetic force emitted from the electronic pen;
A power coil for emitting the external electromagnetic force by the AC power input;
A coil drive driver for outputting the AC power of a predetermined frequency to the power coil;
A coordinate sensing circuit for controlling an AC power output operation of the coil driving driver and calculating coordinates of the electronic pen in the electronic pen sensing region based on an induced current sensed by the line antenna circuit pattern;
The tablet having the power coil pattern of the improved form, characterized in that the pattern of the power coil is configured in the form of a vortex having one or a plurality of turns wound to overlap at least a portion of the electronic pen sensing area. . The method of claim 1,
The line antenna circuit pattern is,
A closed loop type loop antenna connected to ground and forming a circumference of the electronic pen sensing region; And
It is arranged parallel to each other in the shape of a comb teeth in the closed loop form of the loop antenna, one end is electrically connected to the loop antenna and the other end flows out of the electronic pen detection area across the loop antenna in an insulated state. Including a plurality of line antennas,
The coordinate sensing circuit,
A line selection circuit having the other ends of the plurality of line antennas coupled to each other, and selecting one of the other ends of the plurality of line antennas and setting them as differential outputs;
And a differential amplifier for outputting a potential difference between said differential output and said ground. The method of claim 1,
The pattern of the power coil has an improved shape of the power coil pattern, characterized in that the density of the wound pattern is changed from the inside of the vortex to the outside, or from the outside of the vortex to the inside Tablet. The method of claim 1,
The pattern of the power coil is a tablet having an improved form of the power coil pattern, characterized in that configured to increase the wound density of the pattern as it enters the inside of the vortex and the outside of the vortex. The method of claim 1,
The electronic pen detecting region is divided into a plurality of small regions,
And the power coil pattern is formed in each of the small regions as one continuous pattern. 6. The method of claim 5,
And each of the small regions is set to overlap one part with each other, such that the vortex of the pattern of the power coil of each of the small regions overlaps one with each other. The method of claim 1,
The pattern of the power coil is formed by printing a conductive material on both sides of the film-like substrate,
And the conductive material on both sides of the substrate is electrically connected to each other through via holes penetrating the substrate.
KR1020120115403A 2012-10-17 2012-10-17 Tablet with improved power coil KR20140049300A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150145769A (en) * 2014-06-19 2015-12-31 엘지이노텍 주식회사 Touch panel using touch pen with power coil pattern
US9874988B2 (en) 2015-10-14 2018-01-23 Samsung Display Co., Ltd. Electromagnetic induction panel, electromagnetic induction device including the same, and display device including the same
CN109102759A (en) * 2018-08-21 2018-12-28 友达光电股份有限公司 Electronic device, display panel and data transmission system
CN109922752A (en) * 2016-10-28 2019-06-21 柯惠有限合伙公司 Electromagnetic navigation antenna module and electromagnetic navigation system including the component

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150145769A (en) * 2014-06-19 2015-12-31 엘지이노텍 주식회사 Touch panel using touch pen with power coil pattern
US9874988B2 (en) 2015-10-14 2018-01-23 Samsung Display Co., Ltd. Electromagnetic induction panel, electromagnetic induction device including the same, and display device including the same
CN109922752A (en) * 2016-10-28 2019-06-21 柯惠有限合伙公司 Electromagnetic navigation antenna module and electromagnetic navigation system including the component
JP2020502860A (en) * 2016-10-28 2020-01-23 コヴィディエン リミテッド パートナーシップ Electromagnetic navigation antenna assembly and electromagnetic navigation system including the same
EP3531952A4 (en) * 2016-10-28 2020-05-13 Covidien LP Electromagnetic navigation antenna assembly and electromagnetic navigation system including the same
AU2017348101B2 (en) * 2016-10-28 2022-08-18 Covidien Lp Electromagnetic navigation antenna assembly and electromagnetic navigation system including the same
CN109102759A (en) * 2018-08-21 2018-12-28 友达光电股份有限公司 Electronic device, display panel and data transmission system
CN109102759B (en) * 2018-08-21 2019-11-22 友达光电股份有限公司 Electronic device, display panel and data transmission system

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