KR20140077000A - Touch panel and dizitizer pen position sensing method for dizitizer pen the same - Google Patents

Abstract

A touch panel according to an embodiment of the present invention includes: a first sensing module for sensing the angle of a slope between a digitizer pen and an active area; a second sensing module for sensing sensitivity of a magnetic field from the digitizer pen to the active area; a calculation module for calculating a correction value, based on tip length information and slope angle information of the digitizer pen; and an extraction module for extracting coordinates of a point directed by the digitizer pen by applying the correction value to a point where the sensitivity of the magnetic field from the digitizer pen to the active area is the highest. Therefore, durability of the touch panel and work efficiency of a user can be improved while preventing the system load of the touch panel and the load time of the user.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch panel and a method of detecting the position of the digitizer pen with respect to the touch panel.

The present invention relates to a touch panel and a method of detecting the position of the digitizer pen.

As electronic technology and information technology continue to evolve, the proportion of electronic devices in everyday life, including work environments, is steadily increasing. In particular, as electronic technology continues to evolve, touch panels that are intuitive, durable, and multi-touch capable of being used in handheld devices in recent trends of miniaturization and thinning are widely popularized as input devices.

A touch panel is generally installed in a display device to sense a point on a screen that a user touches and to perform control of an electronic device including screen control of the display using information about the detected touch point as input information, There are various advantages such as simplicity, less erroneous operation, space saving, and easy interoperability with IT devices.

One means for inputting information to the touch panel is a digitizer pen. Generally, a digitizer is an input device used to read coordinates, which are analog data of an input original, and to input a design drawing or a graphic in a digital format to a computer or a touch panel. In particular, the user can input information by touching the screen with the digitizer pen.

Therefore, if you touch the pen or move the cursor to input the X and Y position with the digitizer pen, the sensing information of the touch panel senses the coordinates information and automatically transfers it to the memory location. If you press the pen or press the cursor button The corresponding command is executed. In addition, since the digitizer pen can directly input a figure on the touch panel, it is convenient because the figure drawn by a person or a machine can be directly input without using a separate input device. In recent years, a three-dimensional digitizer capable of inputting stereoscopic data has also been developed.

However, as in the patent documents described in the following prior art documents, the touch panel according to the related art can correctly recognize the point of indication only when the angle between the pen and the touch panel is right-angled. If the digitizer pen and the touch panel are not perpendicular to each other, a coordinate error occurs between the intended point and the point actually intended by the touch panel. Therefore, the pen for the digitizer according to the related art has a problem that an error occurs due to the difference between the point of indication intended by the user and the point of recognition recognized by the actual touch panel. In addition, the conventional digitizer pen has a problem that a frequent user input error occurs on input. If such an error occurs repeatedly, the touch panel will be overloaded and the user will have to repeat the re-input.

Korea Patent Publication No. 2011-0074145

It is an object of the present invention to provide a touch panel for preventing an error between a touched point on a touch panel and a point actually recognized .

Another object of the present invention is to provide a method of detecting a position of a digitizer pen with respect to a touch panel for preventing an error between a touched point on a touch panel and an actually recognized point.

To this end, the touch panel according to an embodiment of the present invention includes a first sensing module for sensing a tilt angle formed by the digitizer pen and the active area, a second sensing module for sensing a magnetic field sensitivity radiated from the digitizer pen to the active area, An arithmetic module for calculating a correction value based on tip length information and tilt angle information of the pen, and an extraction module for extracting point coordinates of the digitizer pen by applying a correction value to a center point having the highest magnetic sensitivity.

The touch panel according to an embodiment of the present invention further includes a storage medium storing tip length information.

A storage medium according to an exemplary embodiment of the present invention is an electronically readable medium such as a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an Electrically Erasable and Programmable ROM (EEPROM) A hard disk, a removable disk, a memory card, or a USB memory.

An active area according to an embodiment of the present invention is a transparent input sensing area in which information is input by a digitizer pen.

The first sensing module according to an embodiment of the present invention includes an acceleration sensor or a tilt sensor.

The correction value according to the embodiment of the present invention is derived by the cosine product calculation of the tip length and the tilt angle.

For this, a touch panel according to an embodiment of the present invention includes a second sensing module for sensing the magnetic field sensitivity of the digitizer pen, a head (H) coordinate and a tail (Tail) A first extraction module for extracting the coordinates of the head (H) and the tail (T), a calculation module for calculating a distance (D) between the coordinate of the head (H) And an extraction module for extracting the point coordinates of the digitizer pen by applying a correction value to the center point having the highest sensitivity.

The threshold reference value according to the embodiment of the present invention is the magnetic field strength is equal to or higher than the noise level.

The correction value according to the embodiment of the present invention is obtained by multiplying the coordinates of the point coordinates (x1, y1) and the coordinates (x2, y2) of the head coordinate (x1, y1) x, y) are arithmetically operated.

According to another aspect of the present invention, there is provided a method for sensing a position of a digitizer pen in a touch panel, the method comprising: sensing a tilt angle between the digitizer pen and the active area; Calculating a correction value based on the tilt angle information and the tip length information of the previously stored digitizer pen and extracting the original coordinates of the digitizer pen by compensating the correction value at the center point having the highest intensity of the magnetic field.

The method of sensing a position of a digitizer pen in a touch panel according to an embodiment of the present invention further includes setting a center point as a circle coordinate if the tilt angle is vertical.

The digitizer pen position sensing method of a touch panel according to an embodiment of the present invention further includes sensing a magnetic field strength of an active area.

An active area according to an embodiment of the present invention is a transparent input sensing area in which information is input by a digitizer pen.

The correction value according to the embodiment of the present invention is derived by the cosine product calculation of the tip length and the tilt angle.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

According to various embodiments of the present invention, it is possible to prevent an error between a point selected by the user on the touch panel and a point actually recognized by the touch panel.

Therefore, according to various embodiments of the present invention, it is possible to prevent the system load of the touch panel and the time load of the user, and to improve the durability of the touch panel and the work efficiency of the user.

1 is an exemplary view showing a touch panel according to a first embodiment of the present invention;
2 is a block diagram schematically showing a touch panel according to a first embodiment of the present invention;
3 is a block diagram illustrating a digitizer pen in detail according to a first embodiment of the present invention;
4 is an exemplary view showing a magnetic field generated around a coil according to a first embodiment of the present invention;
5 is a block diagram showing in detail a control unit according to the first embodiment of the present invention;
6 is an exemplary diagram illustrating an example of a second sensing module according to the first embodiment of the present invention;
Figure 7 is an exemplary view showing the digitizer pen according to the first embodiment of the present invention positioned vertically on the second sensing module;
FIG. 8 is an exemplary view showing the result of detecting the magnetic field strength of the second sensing module in the case of FIG. 7;
Figure 9 is an illustration showing that the digitizer pen according to the first embodiment of the present invention is positioned non-perpendicularly on the second sensing module
FIG. 10 is an exemplary view showing a result of detecting the magnetic field intensity of the second sensing module in the case of FIG. 9;
11 is an exemplary diagram for explaining operations of a calculation module, an extraction module, and a storage medium according to the first embodiment of the present invention;
FIG. 12 is an exemplary view showing a case where a display and a sensor are further provided on a touch panel according to the first embodiment of the present invention; FIG.
13 is a block diagram showing a touch panel according to a second embodiment of the present invention;
FIG. 14 is a flowchart showing a method of detecting a position of a digitizer pen with respect to a touch panel according to the first embodiment of the present invention; FIG.
15 is a flowchart showing a method of detecting a position of a digitizer pen with respect to a touch panel according to a second embodiment of the present invention;

BRIEF DESCRIPTION OF THE DRAWINGS The objectives, specific advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. Also, the terms "first", "second", "one side", "other side", and the like are used to distinguish one element from another element, . Also, the singular forms as used below include plural forms unless the phrases expressly have the opposite meaning. Throughout the specification, when an element is referred to as "including" an element, it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, detailed description of related arts which may unnecessarily obscure the gist of the present invention will be omitted.

Throughout the specification, the touch panel collectively refers to an electronic device which adopts a touch screen as an input means. The touch panel refers to a touch panel such as a kiosk of a photo-touch type, a home electronic instrument like a TV, a refrigerator etc., A computer-like tablet pc, and the like.

The same reference numerals are used for the same members as in Figs. 1 to 15.

The basic principle of the present invention is to calculate the correction value using the tip length of the digitizer pen and the tilt angle formed between the pen and the touch panel, and apply the correction value to extract the original coordinates of the point touched by the tip of the digitizer pen.

First, 'instruction' and 'touch' described in the embodiment of the present invention are used in the same sense herein. Also, the 'digitizer pen' and the 'pen' described in the embodiment of the present invention are used in the same sense.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exemplary view showing a touch panel according to a first exemplary embodiment of the present invention, and FIG. 2 is a block diagram schematically showing a touch panel according to a first exemplary embodiment of the present invention.

The touch panel according to the first embodiment of the present invention will now be described with reference to FIGS. 1 and 2. FIG.

1, the upper surface of the touch panel 100 according to the first embodiment of the present invention is divided into an active area a and a bezel area b, and the active area a includes a digitizer pen 110 ), And the bezel region (b) is an opaque wiring arrangement region in which wirings connected to the electrodes disposed on the lower surface of the active region (a) are disposed. Accordingly, the user can input information by touching the digitizer pen 110 to the upper surface of the active area (a) of the touch panel (A).

Referring to FIG. 2, the touch panel 100 according to the first embodiment of the present invention includes a digitizer pen 110 for inputting information and sensing a tilt angle, angle information received from the digitizer pen 110, And a controller 120 for calculating a correction value based on the stored tip length information and extracting the original coordinates of the digitizer pen.

The touch panel 100 constructed as shown in FIG. 2 according to the first embodiment of the present invention will now be described in detail.

First, the digitizer pen 110 is started.

The digitizer pen 110 forms a magnetic field region in the active region a and senses the tilt angle formed by the digitizer pen 110 and the active region a to provide the control unit 120 with the tilt angle.

To describe the structure and function of the digitizer pen 110 in detail, refer to FIG.

3 is a block diagram showing the digitizer pen 110 in detail according to the first embodiment of the present invention.

Referring to FIG. 3, the digitizer pen 110 includes a body 111, a tip 112, a coil 113, and a first sensing module 114.

First, it can be seen that the coil 111 is wound on the body 111 in one direction. Therefore, when the current I flows in one direction to the coil 113 as shown in FIG. 4, a magnetic field is generated around the coil 113. The magnetic field generated in this manner can promote the action of electromagnetic induction or electromagnetic force.

Here, the direction of the magnetic field depends on whether the direction of the current I is from the front to the rear, or from the rear to the front. That is, the direction of the magnetic field changes according to Fleming's rule.

The tip 112 is connected to an end of the lower surface of the body 111. The tip 112 serves as a pen tip for inputting information into the active area a so that the body 111 It is preferable that it is thinner than the thickness of the film.

Meanwhile, the first sensing module 114 senses an angle formed by the upper surface of the active area 'a' and the digitizer pen 110, and preferably includes an inertial sensor.

Here, the inertial sensor is a module for detecting the inertial force of motion and providing various navigation related information such as acceleration, speed, direction and distance of a moving object to be measured. In the first embodiment of the present invention, Tilt sensor.

The control unit 120 calculates the correction value based on the intensity information of the magnetic field generated from the coil 113 and the inclination angle detected from the first sensing module 114 to compensate the error distance so that the coordinates of the point of the digitizer pen 110 to provide.

See FIG. 5 below to describe this in more detail.

5 is a detailed block diagram of the controller 120 according to the first embodiment of the present invention.

5, the controller 120 according to the first embodiment of the present invention includes a second sensing module 121 for sensing the magnetic field sensitivity of the digitizer pen 110, a tip 112 of the digitizer pen 110, An arithmetic module 122 for calculating a correction value based on the length and the inclination angle of the digitizer pen 110 and an extraction module 123 for extracting point coordinates of the digitizer pen 110 by applying a correction value.

The control unit 120 further includes a storage medium 124 in which the length of the tip 112 of the digitizer pen 110 is stored.

The controller 120 according to the first embodiment of the present invention constructed as shown in FIG. 5 will be described in detail as follows.

First, the second sensing module 121 senses the intensity of the magnetic field radiated from the coil 113 to the active area a.

6 is an exemplary view showing an example of a second sensing module 121 according to the first embodiment of the present invention.

6, the second sensing module 121 according to the first embodiment of the present invention includes X-axis channel 1 (ch1) to channel 14 (ch14) and Y-axis channel 15 (ch15) to channel 28 (ch28) .

Here, each of the X-axis and Y-axis channels can detect the intensity of the magnetic field radiated from the coil 113 to the active region (a), and provide the point coordinates according to the intensity of the magnetic field intensity.

In FIG. 6, the number of channels of the second sensing module 121 is assumed to be 14, respectively. However, it is possible to set the number of channels freely within a range satisfying the condition of sensing the magnetic field generated by the digitizer pen 110 .

The strength of the magnetic field intensity differs according to the inclination angle formed between the digitizer pen 110 and the active area a as follows.

First, when the tilt angle formed by the digitizer pen 110 and the active area a is vertical (90 degrees), the coordinates of the point at which the strength of the magnetic field is strongest match the coordinates of the point actually indicated by the tip 112.

On the other hand, when the tilt angle formed by the digitizer pen 110 and the active area a is not perpendicular (90 degrees), the coordinates of the point at which the strength of the magnetic field is strongest are disagreed with the point coordinates actually indicated by the tip 112.

Accordingly, in the case of the perpendicular direction, the coordinates of the strongest point of the magnetic field are the coordinates of the point of indication, and in the case of non-perpendicular, the coordinates of the strongest point of the magnetic field are extracted, The coordinates of the correct point can be extracted.

To explain this in more detail, reference is made to Figs. 7 to 10 below.

7 is an exemplary view showing that the digitizer pen 110 according to the first embodiment of the present invention is positioned vertically on the second sensing module 121. FIG. And the result of the magnetic field strength detection of the module 121 is shown.

Referring to FIG. 7, when the digitizer pen 110 according to the first embodiment of the present invention is positioned perpendicular to the second sensing module 121, the intensity of the magnetic field is as shown in FIG.

Referring to FIG. 8, it can be seen that the strength of the magnetic field C is strongest at the center point C1, and the intensity decreases as the distance from the center point C1 increases (C1> C2> C3> C4).

Referring to FIG. 7 again, the center point C1 is perpendicular to the XY axis of the center point C1 by the X-axis channel and the Y-axis channel of the second sensing module 121, By extracting the coordinates (x, y), the actual support point coordinates of the tip 112 can be known.

9 is a diagram illustrating an example in which the digitizer pen 110 according to the first embodiment of the present invention is positioned on the second sensing module 121 in a non-perpendicular manner, 2 detection module 121 according to an embodiment of the present invention.

Referring to FIG. 9, when the digitizer pen 110 according to the first embodiment of the present invention is positioned not perpendicular to the second sensing module 121, the strength of the magnetic field and the point of the tip 112, As shown in Fig.

9, the intensity C of the magnetic field is strongest at the center point C5, but does not coincide with the point d actually pointed by the tip 112. As shown in Fig. The strength C of the magnetic field is most strongly sensed at the center point C5 on the second sensing module 121 located at the shortest distance from the coil 113. This is because the point 122, do. Therefore, in order to know the accurate point d of the tip 122, the distance e between the center point C5 and the point d must be compensated.

10, the intensity of the magnetic field C is strongest at the center point C5, but the center point C5 does not coincide with the point d actually pointed by the tip 122, unlike FIG. Therefore, in order to extract the indication point (d), the distance (e) must be compensated at the center point (C5).

11 is an exemplary diagram illustrating operations of the operation module 122, the extraction module 123, and the storage medium 124 according to the first embodiment of the present invention.

The length L of the tip 122 is preferably stored in the storage medium 124 in advance. For this purpose, the storage medium 124 may be a random access memory (RAM), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM) A memory card, or a USB memory.

The calculation module 122 calculates the angle information φ between the upper surface of the active area a and the digitizer pen 110 received from the first sensing module 114 and the tip 122 pre- The correction value m is calculated by substituting the length L into the following equation (1).

The extraction module 123 compensates the correction value m provided from the calculation module 122 to the center point C5 to extract the coordinates of the point actually pointed by the tip 122. [

12 is an exemplary view showing a case where a touch panel 100 according to the first embodiment of the present invention is further provided with a display or a sensor.

12, when a display or a sensor is further provided on the touch panel A, a correction value m is calculated by extending a length of another correction constant or tip d to a virtual extent .

That is, the correction value m can be calculated by extending the length L of the tip 122 by the thickness of the display or the sensor and substituting it into the equation (1).

13 is a block diagram showing a touch panel 200 according to a second embodiment of the present invention.

In the description of FIG. 13, the same reference numerals are used for the same constituent elements as those described above, and a description overlapping with the above description will be omitted.

13, the control unit 220 of the touch panel 200 according to the second embodiment of the present invention includes a second sensing module 121 for sensing the magnetic field sensitivity of the digitizer pen 210, a first extraction module 221 for extracting the coordinates of the head H and the head by the threshold value of the first extraction module 221 and a second extraction module 221 for extracting the coordinates of the head H extracted from the first extraction module 221, A correction module 223 for storing a tilt angle and a correction value m according to the distance calculated by the calculation module 222 and a correction module 223 for calculating the distance between the coordinates of the correction module 223, And an extraction module 224 for applying a correction value m to extract a circle coordinate of a point indicated by the tip 122 of the digitizer pen 110. [

The touch panel 200 according to the second embodiment of the present invention constructed as shown in FIG. 13 will be described in detail as follows.

13, the digitizer pen 210 according to the second embodiment of the present invention is different from the digitizer pen 110 according to the first embodiment of FIG. 3 in that it includes a first sensing module 114 for sensing a tilt It is presumed that the constitution is the same except that it does not include.

The second sensing module 121 senses the sensitivity of the magnetic field radiated from the digitizer pen 110 to the active area a.

The first extraction module 221 extracts the coordinates of the head H and tail T using the preset threshold value based on the intensity of the magnetic field sensed by the second sensing module 121 .

Here, the threshold reference value is a threshold value at which the intensity of the magnetic field becomes equal to or higher than the noise level in order to sense the magnetic field of the digitizer pen 110.

The computation module 222 computes the distance D based on the head (H) coordinates and the tail (T) coordinates. The calculated distance D corresponds to the angle formed by the digitizer pen 110 and the active area a, respectively

That is, the tilt angle? Has a constant value depending on the distance D between the head (H) coordinate and the tail (T) coordinate. Thus, if the distance D is known, the tilt angle? Can be known. Therefore, a correction value m corresponding to each calculated distance D and corresponding to each tilt angle? Is derived as an arbitrary experimental result value and is stored in the correction module 223.

[Table 1] is a table showing an example of a correction value m according to each tilt angle corresponding to each distance D stored in the correction module 223.

Distance (D) Angle (φ) Correction value (m) 30 90 0 32 89 0 34 88 1.0 35 87 1.5 36 86 2.0 37 85 2.5 38 84 3.0 39 83 3.5 40 82 4.0 41 81 4.5 42 80 5.0

[Table 1] may be stored in various types of recording media provided in the correction module 223 with the previously-measured values. Specifically, the recording medium may be a random access memory (RAM), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM), a register, a hard disk, Card, a USB memory, and the like.

When the distance D is calculated in the calculation module 222, the correction module 223 retrieves and provides the correction value m corresponding to the distance D to the second extraction module 224.

The second extraction module 224 may then extract the original coordinates of the point indicated by the tip 112 of the digitizer pen 110 based on the provided correction value m.

 By applying the correction value in this manner, the coordinates of the point indicated by the digitizer pen 110 in the active area (a) can be accurately extracted.

14 is a flowchart showing a method 300 for sensing the position of a digitizer pen with respect to the touch panel 100 according to the first embodiment of the present invention.

14, it is determined whether the angle formed by the digitizer pen 110 and the active area a is vertical (90 degrees) (S310).

If it is vertical, the coordinate of the point sensed by the second sensing module 121 becomes the original coordinate of the point indicated by the tip 112 without applying a separate correction value (S320).

However, if not perpendicular, the first sensing module 114 senses the angle formed by the digitizer pen 110 and the active area a (S330).

Thereafter, the calculation module 122 calculates a correction value based on the detected tilt angle information and the length (L) information of the tip 112 of the previously stored digitizer pen 110 (S340).

At this time, the correction value m is calculated by substituting the slope angle information and the length information of the tip into the expression (1).

Finally, the coordinates of the digitizer pen B are extracted by applying the correction value m to the magnetic field point information of the highest intensity sensed by the first sensing module 114 (S350).

By applying the correction value in this manner, the coordinates of the point indicated by the digitizer pen 110 in the active area (a) can be accurately extracted.

FIG. 15 is a flowchart showing a method 300 for detecting a position of a digitizer pen with respect to a touch panel 200 according to a second embodiment of the present invention.

15, the coordinate of the head H is (x1, y1), the coordinate of the tail T is (x2, y2) and the coordinate of the tail is (x, y).

First, the distance D between the head H and the tail T is calculated as shown in the following equation (2).

Then, the angle? Corresponding to the distance D is searched for by referring to the above-mentioned [Table 1], and the correction value m corresponding thereto is applied to the circle coordinates.

(X, y) coordinates can be obtained by applying the correction value m to the following equations (3) and (4), respectively.

That is, x1 and y1 are actual heading point coordinates (x, y) spaced apart from the heading (H) of the vector coordinate system (x1, y1) and (x2, y2) ) Can be arithmetically operated and corrected.

By applying the correction value in this manner, the coordinates of the point indicated by the digitizer pen 110 in the active area (a) can be accurately extracted.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the invention as defined by the appended claims. It is evident that modification or improvement is possible.

100, 200: touch panel 110: digitizer pen
111: Body 112: Tip
113: coil 114: first sensing module
120, 220: control unit 121: second detection module
122, 222: operation module 123: extraction module
124: storage medium 220: second extracting unit
221: first extraction module 223: correction module
224: second extraction module a: active area
b: bezel area I: current
C: magnetic field C1, C5: center point

Claims (14)

A first sensing module for sensing a tilt angle between the digitizer pen and the active area;
A second sensing module for sensing a magnetic field sensitivity radiated from the digitizer pen to the active area;
An arithmetic module for calculating a correction value based on the tip length information and the tilt angle information of the digitizer pen; And
And an extraction module for extracting point coordinates of the digitizer pen by applying the correction value to a point where the magnetic field sensitivity radiated from the digitizer pen to the active area becomes the best. The method according to claim 1,
And a storage medium in which length information of the tip is stored. The storage medium according to claim 2,
As an electronically readable medium,
(ROM), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM), a register, a hard disk, a removable disk, And a touch panel. The method according to claim 1,
Wherein the active area is a transparent input sensing area in which information is input by the digitizer pen. [2] The apparatus of claim 1,
An acceleration sensor or a tilt sensor. The method of claim 1,
And calculating a cosine product of the tip length and the tilt angle. A second sensing module for sensing a magnetic field sensitivity of the digitizer pen;
A first extraction module for extracting head (H) coordinates and tail (T) coordinates using a predetermined threshold reference value based on the magnetic field intensity;
A calculation module for calculating a distance between the head coordinate and the tail coordinate;
A correction module storing a correction value corresponding to a slope according to the distance; And
An extraction module for extracting point coordinates of the digitizer pen by applying the correction value to a point where the magnetic field sensitivity radiated from the digitizer pen to the active area becomes the best,
. 8. The method of claim 7,
Wherein the magnetic field intensity is a threshold value higher than a noise level. The method of claim 7,
(X, y) separated by the correction value m from the head coordinate (x1, y1) on an extension of the head coordinate (x1, y1) and the tail coordinate (x2, y2) in a vector (Vertor) And calculating the value by the following equation. (A) sensing a tilt angle between the digitizer pen and the active area;
(B) sensing an angle between the digitizer pen and the active area when the tilt angle is non-perpendicular;
(C) calculating a correction value based on the tilt angle information and tip length information of the digitizer pen previously stored; And
(D) extracting the original coordinates of the digitizer pen by compensating for the correction value at a point where the magnetic field sensitivity radiated from the digitizer pen to the active area becomes the best
Wherein the position of the digitizer pen is detected. The method according to claim 10, wherein in step (B)
Further comprising the step of setting a point at which the magnetic field sensitivity radiated from the digitizer pen to the active area becomes the best when the tilt angle is vertical. The method according to claim 10, wherein in step (A)
And sensing a magnetic field strength of the active area. ≪ RTI ID = 0.0 > 8. < / RTI > 11. The method of claim 10,
Wherein the touch panel is a transparent input sensing area in which information is input by the digitizer pen. 11. The method of claim 10,
And calculating a cosine product of the tip length and the tilt angle.

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