KR102285225B1 - Touch module and Method for detecting touch position - Google Patents

Abstract

A touch module according to an embodiment includes a touch panel on which touch electrodes are formed; a touch sensing unit for driving the touch screen to receive sensing signals; and a signal processing unit that removes an unnecessary touch area by using the touch information received from the touch sensing unit, wherein the signal processing unit compares the stored data with the received touch information to remove the unnecessary touch area.

Description

Touch module and Method for detecting touch position}

The embodiment relates to a touch module.

The embodiment relates to a touch detection method.

With the development of various portable electronic devices such as mobile communication terminals and notebook computers, a demand for a display device such as a flat panel display device that can be applied thereto is gradually increasing.

Examples of such display devices include a liquid crystal display, a field emission display, a plasma display panel, an organic electro luminescence display device, and an electrophoretic display device. (EPD) and the like.

On the other hand, as an input method for inputting a control signal to such a display device, a touch input method in which a user can directly input information to a touch screen with a finger or a pen using a touch screen is a conventionally used mouse or keyboard. It is replacing input devices such as

That is, a display device equipped with a touch screen includes a monitor such as navigation, an industrial terminal, a notebook computer, a financial automation device, a game machine, and the like, a mobile phone, MP3, PDA, PMP, PSP, portable game machine, DMB receiver It is applied to portable terminals and home appliances such as refrigerators, microwave ovens, washing machines, and the like, and its application is expanding due to the advantage that anyone can easily operate it.

1 is an exemplary view illustrating a state in which a touch error due to a palm is generated in a conventional display device equipped with a touch screen.

In a conventional display device equipped with a touch screen using a capacitive method, as shown in FIG. 1 , a user puts his or her palm on the touch screen to use a pen, or uses the electronic device with both hands. When the device is held, in addition to the normal touch (B) by the pen, an abnormal touch (Touch) (A) by the palm or the like occurs.

There is a problem in that numerous errors occur at the system stage due to the abnormal touch.

The embodiment provides a touch module and a touch detection method capable of effectively extracting an effective pen touch area by removing the abnormal touch when an abnormal touch by a palm or the like is input in addition to a normal touch such as a pen touch.

A touch module according to an embodiment includes a touch panel on which touch electrodes are formed; a touch sensing unit for driving the touch screen to receive sensing signals; and a signal processing unit that removes an unnecessary touch area by using the touch information received from the touch sensing unit, wherein the signal processing unit compares the stored data with the received touch information to remove the unnecessary touch area.

A touch detection method according to an embodiment includes: inputting touch information; storing the touch information in an input mode; comparing the stored touch information with the input touch information; and removing unnecessary touch areas according to the comparison result.

A touch module and a touch detection method according to an embodiment store information such as a user's pen and palm in an input mode, compare it with input touch information, determine whether it is similar, remove an abnormal touch, and remove an abnormal touch area can be effectively extracted to increase the reliability of the touch input.

1 is an exemplary view illustrating a state in which a touch error due to a palm is generated in a conventional display device equipped with a touch screen.
2 is an exploded perspective view of a liquid crystal display including a touch panel according to an embodiment.
3 is a block diagram illustrating a liquid crystal display including a touch panel according to an embodiment.
4 is a block diagram illustrating a signal processing unit according to an embodiment.
5 is a flowchart illustrating a touch extraction method according to an embodiment.
6 is a diagram showing step-by-step data.
7 is a diagram showing step-by-step data.
8 is a diagram showing step-by-step data.
9 is a diagram showing step-by-step data.
10 is a diagram showing step-by-step data.

A touch module according to an embodiment includes a touch panel on which touch electrodes are formed; a touch sensing unit for driving the touch screen to receive sensing signals; and a signal processing unit that removes an unnecessary touch area by using the touch information received from the touch sensing unit, wherein the signal processing unit compares the stored data with the received touch information to remove the unnecessary touch area.

The stored data may be data on the user's pen and palm, and the relationship between the pen and the palm.

When the received touch information includes an edge portion, the signal processing unit may compensate for the edge portion in the touch information.

The signal processing unit may compensate for the edge portion in the stored data when the received touch information includes the edge portion.

The signal processing unit may detect a pen touch area using the received touch information and then set an expected area.

The expected area may be set using the stored distance between the pen and the palm.

The signal processing unit may store the touch information in an input mode.

The signal processing unit may remove an unnecessary touch area when the similarity between the stored data and the received touch information is greater than or equal to a predetermined value.

The signal processing unit may compare the number of unit regions of the stored data, the number of unit regions of touch information, and the sum of the raw data of the stored data and the sum of the raw data of the received touch information.

The signal processing unit may include: a touch position detection unit configured to detect touch coordinates based on the changed voltage value received from the touch sensing unit; a filtering unit that removes the palm from the touch coordinates and transmits it to a timing controller; and a storage unit configured to store the data.

A touch detection method according to an embodiment includes: inputting touch information; storing the touch information in an input mode; comparing the stored touch information with the input touch information; and removing unnecessary touch areas according to the comparison result.

The stored touch information may be data on the user's pen and palm, and the relationship between the pen and the palm.

Comparing the stored touch information and the input touch information may include: detecting a pen touch area from the input touch information; The method may include setting an expected area based on the pen touch area.

The expected area may be detected by the distance between the pen and the palm of the stored touch information.

The method may further include compensating for the edge part when the edge part is included in the expected area.

Compensating for the edge part may compensate for the stored touch information.

Compensating for the edge part may compensate for the input touch information.

Comparing the stored touch information and the input touch information may include comparing the stored touch information and the input touch information in the expected area.

When the degree of similarity between the stored touch information and the input touch information in the expected area is greater than or equal to a predetermined value, the unnecessary touch area may be removed.

In the step of comparing the stored touch information and the input touch information, the number of unit regions of the stored touch information of the expected region and the sum of raw data may be compared with the number of unit regions of the input touch information and the sum of the raw data. there is.

2 is an exploded perspective view of a liquid crystal display including a touch panel according to an embodiment.

Referring to FIG. 2 , the liquid crystal display device according to the embodiment includes a liquid crystal display panel 10 for displaying an image, which is disposed below the liquid crystal display panel 10 to provide light to the liquid crystal display panel 10 . It includes a backlight unit 20 and a touch panel 100 attached to the front surface of the liquid crystal display panel 10 .

In addition, it may include a guide panel 18 that supports the edge of the lower surface of the liquid crystal display panel 10 and is coupled to the backlight unit 20 and a bottom cover 70 that accommodates the backlight unit 20 . there is.

The guide panel 18 may be formed in a form in which a central region is opened. The guide panel 18 has an open central region so that light from the backlight unit 20 can be transmitted to the liquid crystal display panel 10 . The guide panel 18 may be formed in a rectangular shape. The guide panel 80 may be formed of a mold material.

The liquid crystal display panel 10 includes a thin film transistor substrate 11 , a color filter substrate 13 , and a liquid crystal layer interposed between the thin film transistor substrate 11 and the color filter substrate 13 .

The thin film transistor substrate 13 may be formed to have a size larger than that of the color filter substrate 13 . The color filter substrate 13 may be bonded while exposing a portion of the thin film transistor substrate 11 . A driver IC 15 may be mounted on the exposed thin film transistor substrate 11 . The driver IC 15 may supply a signal to a gate line and a data line formed on the thin film transistor substrate 11 . The driver IC 15 may include a gate driver and a data driver. The driver IC 15 may further include a timing controller.

A flexible circuit board 17 may be attached on the exposed thin film transistor substrate 11 . The flexible circuit board 17 may be electrically connected to the driver IC 15 . The flexible circuit board 17 may be formed of a material that can be bent or folded. The flexible circuit board 17 may be attached to the thin film transistor substrate 11 by an anisotropic conductive film (ACF) to be electrically connected to the driver IC 15 .

The touch panel 100 may be located in front of the liquid crystal display panel 10 . The touch panel 100 may be attached to the front surface of the liquid crystal display panel 10 . The touch panel 100 may be attached to the front surface of the color filter substrate 13 . A touch flexible circuit board 110 may be attached to the touch panel 100 . The touch panel 100 may sense a user's touch input and transmit it to a driving chip (not shown) through the touch flexible circuit board 110 . The touch panel 100 will be described in detail later.

The backlight unit 20 may include an optical sheet 30 , a light guide plate 40 , a light source 50 , and a reflection plate 60 .

The optical sheet 30 is positioned between the liquid crystal display panel 10 and the light guide plate 40 to diffuse and condense light from the light source 50 to transmit it to the liquid crystal display panel 10 . The optical sheet 30 may include a prism sheet, a diffusion sheet, and the like.

The light guide plate 40 may be positioned under the optical sheet 30 . The light guide plate 40 is located under the optical sheet 30 , converts the light incident from the light source 50 into surface light, and supplies it to the liquid crystal display panel 10 . The light guide plate 40 is PMMA (polymethyl methacrylate), vinyl chloride, acrylic resin, PC (polycarbonate: polycarbonate)-based, PET (polyethylene terephthalate: polyethylene therephtalate)-based, PE (polyethylene: polyethylene)-based , PS (polystyrene: polystyryene)-based, PP (polypropylene: Polyporpylene)-based, PI (polyimide: polyimide)-based resin, glass, silica (silica), etc. may be formed.

The light source 50 may include a light emitting diode 51 and a printed circuit board 53 .

The light emitting diode 51 is mounted on the printed circuit board 53 , receives a voltage from the printed circuit board 53 , generates light, and transmits it toward the light guide plate 40 .

Although not shown, the printed circuit board 53 may receive a driving voltage from an external driver and apply it to the light emitting diode 51 .

The reflective plate 60 may be positioned between the light guide plate 40 and the bottom cover 70 . The reflector 60 may serve to reflect the light from the light source 50 and transmit it to the light guide plate 40 and the liquid crystal display panel 10 .

In the drawings, it has been described that the touch panel 100 is attached to the liquid crystal display panel 10 as an example, but the touch panel 100 includes a plasma display device (PDP) or an organic light emitting device (OLED). It can be used by being attached to a display device.

3 is a block diagram illustrating a liquid crystal display including a touch panel according to an embodiment.

Referring to FIG. 3 , the liquid crystal display according to the embodiment includes a liquid crystal display panel 10 , a touch panel 100 , a gate driver 200 , a data driver 300 , a timing controller 400 , and a touch sensing unit 500 . ) and a signal processing unit 600 .

The touch panel 100 , the timing controller 400 , the touch sensing unit 500 , and the signal processing unit 600 may constitute a separate touch module.

A plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm may be formed in the liquid crystal display panel 10 in a direction crossing the gate lines GL1 to GLn. A plurality of pixel areas may be defined by the plurality of gate lines GL1 to GLn, and thin film transistors may be formed in each of the plurality of pixel areas. The thin film transistor may be electrically connected to the gate lines GL1 to GLn and the data lines DL1 to DLm.

The thin film transistor is turned on by receiving a gate signal through the gate lines GL1 to GLn, and when the thin film transistor is turned on, the data voltage received from the data lines DL1 to DLm is transferred to the pixel electrode, , an electric field is generated by the potential difference between the voltage applied to the pixel electrode and the common voltage, and the liquid crystal is displaced by the electric field to adjust the luminance of light from the backlight to display an image.

The timing controller 400 receives video data RGB, a horizontal synchronization signal H, a vertical synchronization signal V, and a clock signal CLK, and a gate control signal GCS for controlling the gate driver 200 . ) and generates a data control signal DCS for controlling the data driver 300 .

The gate driver 200 is a shift register that sequentially generates scan pulses in response to the gate control signal GCS from the timing controller 400, and shifts the swing width of the scan pulse to a level suitable for driving the liquid crystal cell. It consists of a level shifter and an output buffer for The gate driver 200 supplies a gate signal to the gate lines GL1 to GLn to turn on the thin film transistors connected to the gate lines GL1 to GLn to select a liquid crystal cell of one horizontal line to which the data voltage is to be supplied. . The data voltage generated from the data driver 300 is supplied to the liquid crystal cell of the horizontal line selected by the gate signal.

The data driver 300 samples and latches the video data RGB received from the timing controller 400 , and then converts it into an analog data voltage. The data driver 300 may supply the data voltage to a plurality of data lines DL1 to DLm.

The gate driver 200 and the data driver 300 may be implemented with a plurality of data integrated circuits.

The touch panel 100 is a configuration for sensing a touch from a user, and may be configured in various forms such as a resistive film type, a capacitive type, and the like. In the embodiment, a case in which the touch panel 100 is a capacitive type will be described as an example.

The touch panel 100 may be configured in various forms depending on the arrangement position. That is, as shown in FIG. 1 , the touch panel 100 may be stacked on the liquid crystal display panel 10 .

In addition, the touch panel 100 may be configured to be embedded in the liquid crystal display panel 10 , and the touch panel 100 may be configured to be formed together with a thin film transistor on the thin film transistor substrate 11 . can

The touch panel 100 may include a plurality of touch electrodes.

The touch sensing unit 500 may detect whether a user touches by using a sensing signal received from the touch panel 100 .

The configuration of the touch sensing unit 500 may be different depending on whether the touch panel 100 is configured in a mutual manner or a self-cap method. Hereinafter, the present invention will be described using the touch panel 100 configured in a mutual manner as an example.

The touch panel 100 using the mutual method is formed to intersect a plurality of driving electrodes T1 to Tn receiving driving pulses from the touch sensing unit 500 and the driving electrodes to transmit a detection signal. ) may be configured to include a plurality of receiving electrodes (R1 to Rm) for transmission.

When a user touches a specific area of the touch panel 100 with a finger or a pen while a driving pulse for touch detection is applied to the driving electrodes T1 to Tn of the touch panel 100, the driving electrodes ( The capacitance between T1 to Tn) and the receiving electrodes R1 to Rm is changed. The change in the capacitance changes the voltage value applied to the touch sensing unit 500 through the receiving electrodes R1 to Rm.

That is, the receiving electrodes R1 to Rm are connected to the touch sensing unit 500 , and the touch sensing unit 500 transmits the changed voltage value to the signal processing unit 600 .

The touch sensing unit 500 may convert the changed voltage value as described above into a digital value and apply it to the signal processing unit 600 .

The signal processing unit 600 may detect a touch position of the touch panel 100 by using the voltage value. The signal processing unit 600 may detect a touch position of the touch panel 100 and transmit a result value to the timing controller 400 or a control unit of an external system.

4 is a block diagram illustrating a signal processing unit according to an embodiment.

Referring to FIG. 4 , the signal processing unit 600 according to the embodiment may include a touch position detection unit 610 , a filtering unit 620 , and a storage unit.

The touch position detection unit 610 may detect the coordinates of each touch through the changed voltage value transmitted from the touch detection unit 500 . The touch position detection unit 610 may create a table by using the coordinates at which each touch is made through the changed voltage value transmitted from the touch sensing unit 500 and the voltage value changed for each coordinate as raw data. .

The touch position detection unit 610 transmits the table including the coordinates and raw data per coordinate as described above to the filtering unit 620 .

The filtering unit 620 may remove a palm from the table and then transmit the result to the timing controller 400 . That is, the filtering unit 620 may transmit only an intended touch value for which palm rejection is performed to the timing controller 400 . In other words, the filtering unit 620 may remove the abnormal touch A by the palm of FIG. 1 , and transmit only the normal touch B by the pen to the timing controller 400 .

The storage unit 630 may store user information. The user's information may be pen and palm information. The storage unit 630 may store the size and shape of the pen input from the user, the size and shape of the palm, and the distance and angle information between the center point of the pen and the palm. The storage unit 630 may store the information detected through the touch position detection unit 610 in the input mode. The user may store the information in the storage unit 630 through one input. Also, the average value information may be transmitted to the storage unit 630 through multiple inputs.

The filtering unit 620 may remove the palm region by comparing the user information stored in the storage unit 630 with the table input from the touch position detection unit 610 . The filtering unit 620 may compare the user information with the input touch information, and when the similarity is equal to or greater than a certain ratio, the palm area may be removed to extract the pen touch and deliver it to the timing controller 400 .

The pen touch extraction method of the filtering unit 620 is as follows.

5 is a flowchart illustrating a method for extracting a touch according to an embodiment, and FIGS. 6 to 10 are diagrams illustrating step-by-step data.

Referring to FIG. 5 , the touch extraction method according to the embodiment detects touch data. (S110)

The touch position detecting unit 610 may receive the changed voltage from the touch sensing unit 500 , and may detect the coordinates at which the touch is made and the raw data per coordinate.

After detecting the touch data, the input mode is checked. (S120)

The input mode may be performed only once for the first time, or may be performed at any time by a user's selection.

When the input mode is performed, the touch position detection unit 610 stores input data in the storage unit 630 . (S125)

The touch position detection unit 610 may store user information in the storage unit 630 in the input mode as shown in FIGS. 6A and 6B . The user's information may be pen and palm information. The storage unit 630 may store the size and shape of the pen, the size and shape of the palm, the distance d between the pen and the palm, and the angle information (θ) received from the user. The user may store the information in the storage unit 630 through one input. Also, the average value information may be transmitted to the storage unit 630 through multiple inputs.

After storing the input data or when not in the input mode, the filtering unit 620 detects the position of the pen as shown in FIGS. 7A and 7B . (S130)

When the position of the pen is not detected, since it is another input such as a finger input, not a pen input, the signal processing unit 600 transmits coordinate information to the timing controller 400 without removing a specific region.

The filtering unit 620 detects the pen position by comparing the table received from the touch position detection unit 610 with user information stored in the storage unit 630 . The filtering unit 620 compares the size and shape of the pen stored in the storage unit 630 with the touch information input from the touch sensing unit 500 and the touch position detecting unit 610, and The pen position may be detected by detecting data similar to the size and shape of the pen.

After detecting the pen position, an expected area may be set. (S140)

The filtering unit 620 may set an expected area of the palm area based on the position of the pen.

The filtering unit 620 draws a circle having a predetermined distance d as a radius from the pen as shown in FIG. 8A . The filtering unit 620 may draw a circle having a radius equal to the distance d between the pen and the palm stored in the storage unit 630 . The filtering unit 620 may draw a circle using the center point distance d between the pen and the palm stored in the storage unit 630 .

After drawing a circle, the filtering unit 620 may set an expected area as shown in FIGS. 8B and 8C . The expected area may be an area in which a touch is placed on an area through which the circle passes. The expected area may be set in consideration of the angle θ between the pen and the palm stored in the storage unit 630 . The expected area may be set using the size and shape of the palm stored in the storage unit 630 . The expected area may be set as a rectangular area including the palm area stored in the storage unit 630 .

The filtering unit 620 determines whether the expected area includes an edge portion. (S150)

The edge portion may be a boundary portion between an effective area and an ineffective area of the touch panel 100 . That is, the filtering unit 620 determines whether the expected area includes an invalid area.

When the expected region includes an edge portion, the filtering unit 620 compensates for the edge portion. (S155)

The filtering unit 620 may compensate for the edge portion in the table received from the touch position detection unit 610 as shown in FIGS. 9A and 9B . The filtering unit 620 may compensate for the edge portion by assigning a weight to the data detected in the effective region. Alternatively, the edge portion may be compensated by correcting the data of the palm area stored in the storage unit 630 .

That is, assuming that the thickness of the touch of the palm area stored in the storage unit 630 is a and the thickness of the touch of the palm area applied from the touch position detection unit 610 is b, the detected data is weighted. In this case, the edge portion may be compensated for by multiplying a/b by a/b by the number N1 of unit areas included in the expected area among the touch areas input from the touch location detecting unit 610 . In addition, the edge portion may be compensated by multiplying the sum S1 of raw data in the touch area input from the touch position detection unit 610 by a/b.

When the data of the palm area stored in the storage unit 630 is corrected, the edge portion may be compensated by multiplying the number N2 of the unit areas stored in the storage unit 630 by b/a. Also, correction may be made by multiplying the sum S2 of the raw data of the palm region stored in the storage unit 630 by b/a.

The filtering unit 620 compensates for the edge portion to accurately remove the palm area even if the user's palm is positioned over the edge portion, thereby clearly detecting an effective pen touch area. That is, even if the user's palm is positioned over the ineffective area, there is an effect that a valid pen touch input can be clearly detected.

The filtering unit 620 may determine whether the data is similar by comparing the touch information input through the touch position detection unit 610 with the user information stored in the storage unit 630 (S160).

When the edge part compensation is present, the filtering unit 620 may compare the compensated data with the user information to determine whether the data are similar.

When the touch information and the user information in the expected area are not similar, it is determined that all of the touch information transmitted from the touch position detection unit 610 are valid touches, and the signal processing unit 600 determines the touch position with the timing controller 400 . send.

The filtering unit 620 compares the touch information in the expected area with the user information, and determines that the touch information is the palm area when the similarity is greater than or equal to a predetermined ratio.

The filtering unit 620 may determine the touch information as the palm area when the similarity between the touch information in the expected area and the user information is 80% or more.

The filtering unit 620 may determine the similarity by comparing the number of unit regions of touch information in the expected region with the number of unit regions stored in the storage, and storing the sum and storage of raw data of touch information in the expected region. The similarity may be determined by comparing the sum of the raw data of the palm region stored in the unit, or the similarity may be determined by comparing both the number of the unit regions and the sum of the raw data.

When the filtering unit 620 determines that the input touch information and the user's information are similar, the filtering unit 620 removes the palm region as shown in FIG. 10 . (S170)

The filtering unit 620 removes a touch area including a common area between the expected area and the touch area.

That is, when even a part of the touch area is included in the expected area, the entire touch area may be removed. Since there may be an error between the user's pen and palm positions, when even a part of the touch area is included in the expected area, the entire touch area is removed to effectively extract an effective pen touch area.

After the palm region is removed, the signal processing unit 600 extracts coordinates and transmits the extracted coordinates to the timing controller 400 . (S180)

That is, the signal processing unit 600 may detect only the pen touch area from which the palm area is removed and transmit it to the timing controller 400 .

10: liquid crystal display panel
11: Thin film transistor substrate
13: color filter substrate
15: driver IC
18: guide panel
20: backlight unit
30: optical sheet
40: light guide plate
50: light source
60: reflector
70: bottom cover
100: touch panel
200: gate driver
300: data driver
400: timing controller
500: touch sensing unit
600: signal processing unit
610: touch position detection unit
620: filtering unit
630: storage

Claims (20)

a touch panel on which touch electrodes are formed;
a touch sensing unit for driving the touch panel to receive sensing signals; and
A signal processing unit for removing an unnecessary touch area by using the touch information received from the touch sensing unit,
The signal processing unit detects a pen position by comparing the stored data with the received touch information, draws a circle having a radius equal to the distance between the pen and the palm in the stored data based on the pen position, and the circle passes Recognizes and removes the area where there is a touch on the area as an unnecessary touch area,
The signal processing unit sets an expected area of the palm area based on the position of the pen, determines whether the expected area includes an edge portion that is a boundary between an effective area and an ineffective area of the touch panel, and determines that the expected area is the ratio When the effective area is included, the value (a/b) obtained by dividing the touch thickness (a) of the palm area of the stored data by the touch thickness (b) of the palm area of the received touch information is equal to the value of the received touch information. The edge part is compensated by multiplying the number of unit regions included in the expected region (N1), or the touch thickness (b) of the palm region of the received touch information is divided by the touch thickness (a) of the palm region of the stored data (b/a) is multiplied by the number (N1) of unit regions included in the predicted region of the stored data to compensate for the edge part, and to recognize and control the predicted region for which the edge part is compensated as the unnecessary touch region. module. According to claim 1,
The stored data is data on the user's pen, palm, and the relationship between the pen and the palm of the touch module. According to claim 1,
The signal processing unit is a touch module for compensating for an edge portion in the touch information when the received touch information includes an edge portion. 4. The method of claim 3,
The signal processing unit is a touch module for compensating for an edge portion in the stored data when the received touch information includes an edge portion. 3. The method of claim 2,
The signal processing unit detects a pen touch area using the received touch information and then sets an expected area. 6. The method of claim 5,
The expected area is a touch module that is set using the stored distance between the pen and the palm. According to claim 1,
The signal processing unit is a touch module for storing the touch information in an input mode. According to claim 1,
The signal processing unit removes an unnecessary touch area when the similarity between the stored data and the received touch information is greater than or equal to a predetermined value. According to claim 1,
The signal processing unit compares the number of unit regions of the stored data, the number of unit regions of touch information, and the sum of the raw data of the stored data and the sum of the raw data of the received touch information. According to claim 1,
The signal processing unit,
a touch position detection unit configured to detect touch coordinates through the changed voltage value transmitted from the touch sensing unit;
a filtering unit that removes the palm from the touch coordinates and transmits it to a timing controller; and
A touch module including a storage unit for storing the data. step of inputting touch information;
storing the touch information in an input mode;
comparing the stored touch information with the input touch information; and
removing unnecessary touch areas according to the comparison result;
In the removing step, the pen position is detected according to the comparison result, and a circle having a radius equal to the distance between the pen and the palm is drawn in the stored touch information based on the pen position, and on an area through which the circle passes. Recognizes and removes the area with the touch as the unnecessary touch area,
In the removing step, the pen position is detected according to the comparison result, an expected area of the palm area is set based on the pen position, and the expected area is an edge that is a boundary between an effective area and an ineffective area of the touch panel. It is determined whether or not it includes a negative region, and when the expected region includes the invalid region, the value obtained by dividing the touch thickness (a) of the palm region of the stored data by the touch thickness (b) of the palm region of the input touch information ( a/b) is multiplied by the number of unit regions (N1) included in the expected region of the input touch information to compensate the edge portion, or the touch thickness (b) of the palm region of the input touch information is calculated as the stored data Compensating for the edge by multiplying the value (b/a) divided by the touch thickness (a) of the palm area of the stored data by the number of unit areas (N1) included in the expected area of the stored data, A touch detection method for recognizing an area as the unnecessary touch area and removing it. 12. The method of claim 11,
The stored touch information is data about a user's pen, palm, and a relationship between the pen and the palm of the user. 13. The method of claim 12,
Comparing the stored touch information and the input touch information,
detecting a pen touch area from the input touch information;
and setting an expected area based on the pen touch area. 14. The method of claim 13,
The expected area is a touch detection method in which the stored touch information is detected by the distance between the pen and the palm. 14. The method of claim 13,
and compensating for the edge when the edge is included in the expected area. 16. The method of claim 15,
Compensating for the edge part is a touch detection method of compensating for the stored touch information. 16. The method of claim 15,
Compensating for the edge part is a touch detection method of compensating for the input touch information. 14. The method of claim 13,
Comparing the stored touch information and the input touch information,
A touch detection method for comparing the stored touch information and the input touch information in the expected area. 19. The method of claim 18,
A touch detection method for removing an unnecessary touch area when the similarity between the stored touch information and the input touch information in the expected area is greater than or equal to a predetermined value. 19. The method of claim 18,
Comparing the stored touch information and the input touch information,
A touch detection method for comparing the number of unit regions and the sum of raw data of the stored touch information of the expected region with the number of unit regions of the input touch information and the sum of raw data.

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