KR102134806B1 - Stylus pen having measuring gradient function and gradient measuring method thereof - Google Patents

Abstract

The present invention relates to a stylus pen having a tilt measurement function and an angle measuring method of a stylus pen, in a stylus pen that visually displays information according to a user's operation on a display equipped with a ground electrode, the distance from the ground electrode And a control unit for calculating a degree of inclination based on the capacitance of each of the self-capacitance electrodes and the capacitance of the self-capacitance electrode, respectively, wherein the control unit includes the plurality of self-capacitance electrodes according to the tilt of the stylus pen. The relative difference of each capacitance is compared, and the degree of tilt of the stylus pen is calculated based on the difference in the compared capacitance. It is possible to measure the slope independently through a plurality of self-capacitance electrodes, and calculate the slope based on the difference value of the capacitance of the plurality of self-capacitance electrodes to minimize interference such as noise, thereby enabling more precise slope measurement.

Description

Stylus pen with tilt measurement function and angle measurement method of stylus pen {STYLUS PEN HAVING MEASURING GRADIENT FUNCTION AND GRADIENT MEASURING METHOD THEREOF}

The present invention relates to a stylus pen having a tilt measurement function and a method for measuring the angle of a stylus pen, and more specifically, to an angle measurement method of a stylus pen and a stylus pen that can more accurately and easily measure the degree of tilt of a stylus pen on a display. It is about.

In general, on the display of a mobile device, an interface device such as a keyboard or a remote controller is used to select an object or area displayed on the screen, as well as selecting an area of the screen directly with a finger or a stylus pen. The input touch panel method is applied.

In the touch panel method, a resistive film method that is driven by applying pressure on a display and a capacitive element is configured by using a change in the capacitance of the capacitive element by configuring a capacitive element on the display. Since the capacitive type is not a method of directly applying pressure, a clear picture quality can be expected even if it is used for a long time without exerting excessive pressure on the display, and in recent years, the capacitive type is mainly used rather than the resistive type. The capacitance method is further divided into mutual capacitance and self capacitance.

The capacitive touch panel can use electromagnetic mutual induction, which is arranged by a coil for electromagnetic induction on each of the tip and display of the stylus pen, and by the law of electromagnetic induction when the induction coil of the stylus pen and the display are close. This is a method of determining the input of the stylus pen by detecting the change in the generated current.

On the other hand, the stylus pen requires accurate tilt measurement for precise input on the display. In order to measure the inclination of the stylus pen, a sensor or a detection circuit for measuring the inclination needs to be additionally arranged, and thus, the price of the display increases.

In Korean Patent Publication No. 10-2018-0049629, a plurality of electrodes are arranged and a touch panel having a variable capacitance formed between electrodes according to contact of a stylus pen is provided to correspond to a change in capacitance from electrodes of the touch panel. A method of detecting an inclination of a stylus pen based on a movement deviation between preset reference signal patterns by receiving an electric signal and extracting a signal pattern has been proposed.

However, the above-mentioned patent discloses RX and TX (first electrode and second electrode) on the touch panel and configures the LC circuit part on the stylus pen to analyze the signal pattern according to the change in the mutual capacitance, and compare with the preset signal. As a method of measuring the inclination of the stylus pen through the deviation, a sensitivity problem occurs according to the distance between the LC circuit unit configured in the stylus pen and the first electrode and the second electrode configured in the touch panel. Due to this, interference occurs in the capacitance of the electrode, and the stylus pen cannot be used alone, and thus there is a problem in that it cannot be compatible with various devices.

(Document 0001) Republic of Korea Patent Publication No. 10-2018-0049629 (Publication date: 18.05.11.) (Document 0002) Republic of Korea Patent Publication No. 10-2016-0031295 (published date: 16.03.22.) (Document 0003) Republic of Korea Patent Publication No. 10-2014-0093445 (Publication date: 14.07.28.)

An object of the present invention in consideration of the above points is to provide a stylus pen and an angle measuring method of a stylus pen and a stylus pen that can be used alone and accurately measure tilt to be compatible with various devices.

In a stylus pen having a tilt measurement function according to an embodiment of the present invention, in a stylus pen that visually displays information according to a user's manipulation on a display equipped with a ground electrode, the capacitance is respectively determined according to the distance from the ground electrode. And a controller for calculating the degree of inclination based on the varying capacitances of the capacitive electrodes and the capacitances of the capacitive electrodes, and comparing the relative differences between the capacitances of each of the plurality of capacitive electrodes according to the inclination of the stylus pen. , Calculate the degree of tilt of the stylus pen based on the difference in the compared capacitance.

In addition, the capacitance of the self-capacitance electrode decreases as the distance from the ground electrode approaches, and the degree of capacitance reduction of each of the plurality of self-capacitance electrodes may be different.

In addition, the capacitive electrodes may be stacked up and down while being spaced apart from each other by a certain distance.

In addition, the stylus pen may be provided with a downwardly inclined nib, and a self-capacitance electrode may be provided at the nib of the stylus pen.

In addition, when the stylus pen is vertically disposed on the display device, the control unit sets a difference value comparing the capacitances of the plurality of self-capacitance electrodes with each other as an initial value, and the capacitance of the self-capacitance electrode when the stylus pen is inclined. It is possible to calculate the degree of inclination of the stylus pen by comparing the difference value comparing with each other with the initial value.

In addition, there may be three or more self-capacitance electrodes.

The angle measurement method of the stylus pen according to an embodiment of the present invention calculates the degree of inclination based on the capacitance of a plurality of self-capacitance electrodes and self-capacitance electrodes, each of which changes capacitance depending on the distance from the ground electrode provided on the display. In the method for measuring the inclination of a stylus pen including a control unit, an initial value setting step of setting a difference value comparing the capacitances of a plurality of self-capacitance electrodes to an initial value, a plurality of self-capacitance electrodes according to the tilt of the stylus pen The difference between the capacitances of each of the difference values calculated in the comparison value calculating step and the comparison value calculating step in which the difference value is calculated with respect to the initial value is reduced stepwise, and the stylus is based on the reduced degree. And a slope calculation step of calculating the slope of the pen.

In addition, the initial value setting step, the initial capacitance measurement step of measuring the capacitance of each of a plurality of self-capacitance electrodes in a state in which the stylus pen is vertically placed on the display, each capacitance measured in the initial capacitance measurement process to each other An initial capacity comparison process for comparing and calculating a difference value and an initial value storage process for storing the difference values calculated in the initial capacity comparison process as initial values may be included.

In addition, the comparison value calculating step calculates a difference value by comparing each capacitance measured in the capacitance measurement process and the capacitance measurement process to measure the capacitances of the plurality of self-capacitance electrodes according to the tilt of the stylus pen. It may include a reduction degree calculation process for calculating the degree to which the difference value is reduced from the initial value by comparing the difference value calculated in the capacitance comparison process and the capacitance comparison process with the initial value set in the initial value setting step.

According to an embodiment of the present invention, the stylus pen itself can be measured using a self-capacitance electrode, so that it can be compatible with various devices.

In addition, since the slope is calculated and used based on the difference in capacitance between the plurality of self-capacitance electrodes, the influence on noise or other errors is small, so that it is possible to accurately measure the slope.

1 is a schematic diagram showing a stylus pen according to an embodiment of the present invention.
2 to 5 is a conceptual diagram showing the capacitance according to the inclination of the stylus pen according to an embodiment of the present invention.
6 is a flowchart illustrating an angle measuring method of a stylus pen according to an embodiment of the present invention.
7 is a flowchart illustrating an initial value setting step according to an embodiment of the present invention.
8 is a flowchart illustrating a comparison value calculation step according to an embodiment of the present invention.

In the description of the present invention, when it is determined that detailed descriptions of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

Embodiments according to the concept of the present invention can be applied to various changes and may have various forms, and thus, specific embodiments will be illustrated in the drawings and described in detail in the present specification or application. However, this is not intended to limit the embodiment according to the concept of the present invention to a specific disclosure form, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used herein are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, the "inclusive" or "gajida" and the terms are staking the features, numbers, steps, operations, elements, parts or geotyiji to be a combination thereof specify the presence, of one or more other features, integers It should be understood that it does not preclude the existence or addition possibility of steps, actions, components, parts or combinations thereof.

Hereinafter, the present invention will be described in detail.

1 is a schematic diagram showing a stylus pen according to an embodiment of the present invention.

The stylus pen according to an embodiment of the present invention is a stylus pen that visually displays information according to a user's operation on a display 10 equipped with a ground electrode 11, at a distance from the ground electrode 11 A plurality of self-capacitance electrodes 100, each of which varies according to the capacitance, and a control unit 300 for calculating the degree of inclination based on the capacitance of the self-capacitance electrode 100, wherein the control unit 300 includes the stylus The relative difference in capacitance of each of the plurality of self-capacitance electrodes 100 according to the inclination of the pen is compared, and the degree of inclination of the stylus pen is calculated based on the difference in the compared capacitance.

First, the overall configuration of the stylus pen according to the present invention will be described with reference to FIG. 1, wherein the stylus pen has an exoskeleton extending in the longitudinal direction and includes a communication unit 500, a battery 400, a control unit 300, and a capacitance measurement unit 200. ), a plurality of self-capacitance electrodes 100 may be included.

In the present invention, the display 10 refers to a camera, a mobile phone, a smart phone, a laptop, PDF, PMP, navigation and other terminals, and may be varied depending on the purpose of use. A ground electrode 11 may be provided on the display 10.

The communication unit 500 is a means for receiving and/or transmitting information with the display 10, and can transmit information by wire or wireless, and various communication networks such as BLUETOOTH, WLAN, WIFI, NFC, BEACON can be applied. More preferably, it is possible to use BLUETOOTH interlocked with the display 10.

The battery 400 means all means for supplying power to the communication unit 500, the control unit 400, the electrostatic capacity measurement unit 200, and the self-capacitance electrode 100. The battery 400 may be charged by wire or wireless.

The capacitive measurement unit 200 is connected to the self-capacitance electrode 100 to measure the capacitance of the self-capacitance electrode 100. The capacitive measurement unit 200 may be formed using a capacitor (CAPACITOR), an inductor (INDUCTOR) and a resistor (RESISTANCE), and various other devices may be added or various circuits may be used.

The self-capacitance electrode 100 of the present invention is an electrode (SELF-CAPACITANCE) having a capacity of a circuit or a circuit element itself, and may be composed of a capacitor C, an inductor L, or a composite circuit thereof. The self-capacitance electrode 100 receives power from the battery 400 to emit electrostatic capacity. In the present invention, the self-capacitance electrode 100 may be a plurality.

In one embodiment, the self-capacitance electrodes 100 may be stacked up and down while being spaced apart from each other. For example, the self-capacitance electrode 100 may be composed of the first electrode 110 to the third electrode 130, the second electrode 120 is located on top of the first electrode 110, The third electrode 130 is positioned on the second electrode 120. In addition, the plurality of self-capacitance electrodes 100 may be provided spaced apart from each other by a predetermined distance.

In one embodiment of the present invention, the stylus pen is provided with a downwardly inclined nib 600, and the self-capacitance electrode 100 is stacked up and down on the nib 600 of the stylus pen to be spaced a predetermined distance apart. Can. The self-capacitance electrode 100 provided on the nib 600 minimizes interference by the hand when the user grips the stylus pen.

The capacitance of the self-capacitance electrode 100 decreases as the distance from the ground electrode 11 provided on the display 10 approaches, and the degree of capacitance reduction of each of the plurality of self-capacitance electrodes 100 Are different. That is, assuming that the first electrode 110 to the third electrode 130 emit the same capacitance, the first electrode 110 is closest to the ground electrode 11, so the measured amount of capacitance is the most It appears small, and the measured amount of capacitance increases in the order of the second electrode 120 and the third electrode 130 sequentially. Accordingly, the first electrode 110 and the second electrode 120, the first electrode 110 and the third electrode 130, the second electrode 120 and the third electrode 130, respectively, from the measured capacitance Differences arise.

In the present invention, it is possible to calculate the degree of tilt of the stylus pen based on the above-described difference. The capacitance of the self-capacitance electrode 100 is measured by the capacitance measurement unit 200, the calculated value is calculated by the control unit 400 to calculate the degree of inclination of the stylus pen, and then the communication unit 500 ) To transmit the tilt information to the display 10.

The control unit 400 of the present invention may be provided inside the stylus pen, and a Micro Controller Unit (MCU) may be used. The MCU is a type of computer that performs a predetermined function and can perform functions such as CPU core, memory, and input/output.

2 to 5 is a conceptual diagram showing the capacitance according to the inclination of the stylus pen according to an embodiment of the present invention. FIG. 2 shows the case where the stylus pen is vertical (0°) in the display 10, FIG. 3 shows a case of 45°, FIG. 4 shows a case of 60°, and FIG. 5 shows the stylus pen showing the display 10 It shows the case to be in contact with.

If the operation of the control unit 400 of the present invention and the calculation of the slope of the stylus pen are described, it is assumed that the slope changes within the range of vertical (0°) to horizontal (90°) on the display 10, The plurality of self-capacitance electrodes 100 have different capacitances depending on the degree of inclination of each stylus pen. The controller 400 calculates the degree of inclination of the stylus pen based on the degree of change in the capacitance.

In addition, in the present invention, it is possible to calculate the degree of inclination of the stylus pen based on the difference value by comparing the capacitance of each of the plurality of self-capacitance electrodes 100 with each other.

2(a), 3(a), and 4(a) are conceptual views illustrating a stylus pen according to an embodiment of the present invention, and FIGS. 2(b), 3(b), 4B is a graph showing the capacitance at each slope. In FIG. 2B, the first electrode 110, the second electrode 120, and the third electrode 130 sequentially increase the size of the capacitance, but the y-axis is the first electrode 110 for ease of understanding. The capacitance of the second electrode 120, the capacitance in the order of the third electrode 130 was displayed. Accordingly, the first to third electrodes are moved in an increasing direction on the y-axis when saturated as the distance from the ground electrode 11 approaches. Hereinafter, the same applies to the case of FIGS. 3B to 5B. In the figure, the x-axis represents time.

When the mechanism is specifically described with reference to FIGS. 2 to 5, the plurality of self-capacitance electrodes 100 have different capacitances according to the distance from the ground electrode 11. For convenience of description, the plurality of self-capacitance electrodes 100 will be described on the assumption that they are composed of first electrodes 110 to third electrodes 130. If the capacitance of the first electrode 110 is ⅰ, the capacitance of the second electrode 120 is ii, and the capacitance of the third electrode 130 is ⅲ, in this case, the first electrode 110 ) And the difference between the second electrode 120 is ⅰ-ii, the difference between the first electrode 110 and the third electrode 130 is ⅰ-ⅲ, and the second electrode 120 and the third electrode 130 The difference is ii-ⅲ. The difference value is greatest when the stylus pen is erected vertically (0°) on the display 10, and decreases as the stylus pen approaches horizontal (90°) on the display 10.

The control unit 400 of the present invention using the above method calculates the degree of inclination of the stylus pen using the values of ⅰ-ii, ⅰ-ⅲ, and ii-ⅲ. In the present invention according to the above method, since the degree of change in capacitance is measured through a plurality of capacitive electrodes 100, the stylus pen is more precise than measuring the amount of change in capacitance using a single capacitive electrode 100. Tilt calculation is possible. In the case of using one self-capacitance electrode 100, noise is generated according to the state of the display 10, external environmental conditions, or hand contact, and it is difficult to perform correction, and an error occurs even if it is performed. have. In the present invention, even if an external environmental condition or other noise occurs using a plurality of self-capacitance electrodes 100, the plurality of self-capacitance electrodes 100 are affected together, and the difference values (ⅰ-ii, ⅰ-ⅲ) , Ii-ⅲ) is used before and after the noise is generated.

The difference value may vary depending on the inclination angle of the stylus pen, and the control unit 400 uses the amount of change in the difference value when the inclination of the stylus pen changes from 0 to 90 degrees to the predetermined reference or range. The degree of inclination of the stylus pen can be calculated from the size of the difference value.

In another embodiment of the present invention, the control unit 400 stores the initial value and compares the initial value with the information on the capacitance of the magnetic capacitive electrode 100 according to the inclination of the stylus pen to determine the stylus pen. The degree of slope can be calculated.

Specifically, when the stylus pen is placed vertically (0°) on the display 10, the control unit 400 compares the capacitance of the plurality of self-capacitance electrodes 100 with each other (ⅰ-ii, ⅰ -Ⅲ, ii-ⅲ) can be set as the initial value. Subsequently, the degree of inclination of the stylus pen by comparing the difference values (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) comparing the capacitances of the capacitive electrodes 100 with each other in the state where the stylus pen is inclined. It is a way to calculate.

For example, as shown in FIG. 2, when the stylus pen is vertical (0°) in the display, the difference values (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) are the largest and are set as initial values. . As shown in FIG. 3, when the stylus pen is 45° on the display 10, the first electrode 110 to the third electrode 130 are perpendicular to the ground electrode 11 (0°). As it gets closer, all of the capacitance decreases. In this case, the amount of reduced capacitance of the first electrode 110 is smaller than the amount of reduced capacitance of the second electrode 120, and the amount of reduced capacitance of the second electrode 120 is the capacitance of the third electrode 130 Less than the reduction. Accordingly, the difference value (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) at 45° of the stylus pen is the difference value (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) when the stylus pen is vertical (0°). ). In addition, as shown in FIG. 4, when the stylus pen is 60°, the difference value (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) is smaller than that of 45°, and as shown in FIG. 5, the stylus pen is When the display 10 is touched, the difference values (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) are the smallest. The control unit 400 uses the difference value (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) gradually decreasing according to the degree of inclination of the stylus pen so that the difference value when the stylus pen is vertical (0°) ( This is a method of measuring the degree of inclination of the stylus pen by comparing the difference values when the stylus pen has a certain angle.

The reduction ratio of the difference value (ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) according to the degree of inclination of the stylus pen is the position of the magnetic capacitive electrode 100, the capacitance, the shape of the stylus pen, the display 10 It may be different depending on the type or shape, and the difference value may decrease in proportion to the initial value.

The present invention to which the above method is applied uses the relative difference between the plurality of magnetic capacitive electrodes 100 by comparing the difference values (ⅰ-ii, ⅰ-ⅲ, and ii-ⅲ), thereby enabling more accurate slope calculation and stylus. The tilt can be calculated only by configuring the pen itself. In addition, the display 10 does not require a separate RX or TX device, which has an economical advantage.

The stylus pen of the present invention illustrates three capacitive electrodes 100 in the above-described example, but uses two capacitive electrodes 100 or three or more capacitive electrodes 100 for more accurate tilt measurement. You can do it.

6 is a flowchart illustrating an angle measuring method of a stylus pen according to an embodiment of the present invention.

Referring to FIG. 6, the method for measuring the angle of the stylus pen according to an embodiment of the present invention includes a plurality of self-capacitance electrodes 100 whose capacitance changes depending on the distance from the ground electrode 11 provided on the display 10. ) And a control unit 400 for calculating the degree of inclination based on the capacitance of the self-capacitance electrode 100, wherein the capacitance of the plurality of self-capacitance electrodes 100 is The initial value setting step of setting the compared difference value as an initial value (S100), the difference value comparing the capacitances of the plurality of self-capacitance electrodes 100 according to the inclination of the stylus pen decreases with respect to the initial value Gradient to classify the reduced degree of the difference value calculated in the comparison value calculation step (S200) and the comparison value calculation step (S200) to calculate the calculated degree and to calculate the slope of the stylus pen based on the reduced degree It includes a calculation step (S300).

When the use state is first described in the present invention, in the angle measuring method of the stylus pen, the user places the stylus pen vertically on the display 10 and stores the state information as the initial value in the controller 400. When the initial value storage is completed, when the stylus pen is tilted by the user's manipulation, the controller 400 calculates tilt information of the stylus pen.

7 is a flowchart illustrating an initial value setting step (S100) according to an embodiment of the present invention.

Referring to FIG. 7, in the present invention, the initial value setting step (S100) measures the capacitances of the plurality of self-capacitance electrodes 100 in a state where the stylus pen is vertically placed on the display 10, respectively. In the initial capacity measurement process (S110), the initial capacity comparison process (S120) and the initial capacity comparison process (S120) for comparing the respective capacitance measured in the initial capacity measurement process (S110) to calculate a difference value It may include an initial value storage process (S130) for storing the calculated difference value as an initial value.

Referring back to FIG. 2, in the initial capacitance measurement process (S110), a stylus pen is vertically placed on the display 10, and the capacitance emitted from the capacitance electrode is measured by the capacitance measurement unit 200 to control the controller. (400). In the initial capacity comparison process (S120), the control unit 400 compares the capacitance of each of the plurality of self-capacitance electrodes 100 received in the initial capacity measurement process (S110), and calculates the difference value. Thereafter, in the initial value storage process (S130), the control unit 400 stores the difference value as an initial value. In this case, the difference value stored as the initial value may be plural. For example, when the self-capacitance electrode 100 is composed of the first electrode 110 to the third electrode 130, the stored initial value is a difference value when the stylus pen is vertical (0°) (ⅰ- Ii, ⅰ-ⅲ, ii-ⅲ). Hereinafter, the initial values are expressed as (ⅰ-ii)_s, (ⅰ-ⅲ)_s, and (ii-ⅲ)_s.

8 is a flowchart illustrating a comparison value calculation step (S200) according to an embodiment of the present invention.

Referring to FIG. 8, in the present invention, the comparison value calculating step (S200) includes a capacitance measurement process (S210) for measuring the capacitances of the plurality of self-capacitance electrodes 100 according to the tilt of the stylus pen, respectively. Set the initial value of the difference value calculated in the capacitance comparison process (S220) and the capacitance comparison process (S220) to calculate the difference value by comparing each capacitance measured in the capacitance measurement process (S210) with each other. It may include a reduction degree calculation process (S230) for calculating the degree of reduction of the difference value from the initial value compared to the initial value set in step (S100).

The comparison value calculation step (S200) compares the degree of change in capacitance due to the inclination of the stylus pen according to the user's manipulation after the initial value setting step (S100) to the initial value. Specifically, the capacitance measurement process (S210) measures the capacitance of the self-capacitance electrode 100 in the state where the stylus pen is tilted, and transmits it to the control unit 400. The capacitance comparison process (S220) compares the capacitance received from the control unit 400 to calculate the difference value. The reduction degree calculating process S230 compares the difference value calculated by the control unit 400 with the initial value to calculate the reduced degree.

For example, when the self-capacitance electrode 100 is composed of the first electrode 110 to the third electrode 130, the reduction degree calculation process S230 is the difference value calculated in the capacitance comparison process S220 ( Ⅰ-ii, ⅰ-ⅲ, ii-ⅲ) and the initial value set in the initial value setting step (S100) ((ⅰ-ii)_s, (ⅰ-ⅲ)_s, (ii-ⅲ)_s) The degree to which the difference value is reduced is calculated from the value. In this case, the reduced degree is calculated as (ⅰ-ii)_s-(ⅰ-ii), (ⅰ-ⅲ)_s-(ⅰ-ⅲ), (ii-ⅲ)_s-(ii- 차이) or , (Ⅰ-ii)/(ⅰ-ii)_s, (ⅰ-ⅲ)/(ⅰ-ⅲ)_s, (ii-ⅲ)/(ii-ⅲ)_s. In addition, various formulas can be used.

The slope calculation step (S300) calculates the slope of the stylus pen by stepwise dividing the degree at which the calculated difference value is reduced from the initial value, and the degree at which the difference value is reduced from the initial value is in the range of 0 to 1. Assuming that the range of 0 to 1 is divided into a number of ranges, the slope of the stylus pen is derived according to the number of ranges. The plurality of ranges may be uniformly determined, but it is preferable to set each in accordance with the degree of change of the capacitance or the difference value.

The degree of inclination of the stylus pen calculated through the above steps may be expressed on the display 10 through the communication unit 500 of the stylus pen.

The present invention, which is performed step by step in the above manner, does not require any additional configuration, is simple in calculation, and can accurately calculate the slope of the stylus pen.

10: display 11: ground electrode
100: self-capacitance electrode 110: first electrode
120: second electrode 130: third electrode
200: capacitance measuring unit
300: control unit
400: battery
500: communication unit
600: nib
S100: Initial value setting step S110: Initial capacity measurement process
S120: Initial capacity comparison process S130: Initial value storage process
S200: Comparison value calculation step S210: Capacitance measurement process
S220: Capacitance comparison process S230: Reduction accuracy calculation process
S300: slope calculation step

Claims (9)

In the stylus pen to visually display information according to the user's operation on a display equipped with a ground electrode,
A plurality of self-capacitance electrodes, each of which changes capacitance according to the distance from the ground electrode; And
Includes a control unit for calculating the degree of inclination based on the capacitance of the self-capacitance electrode,
The control unit,
Comparing the relative difference of the capacitance of each of the plurality of self-capacitance electrodes according to the tilt of the stylus pen, and calculate the degree of tilt of the stylus pen based on the difference in the compared capacitance,
When the stylus pen is vertically arranged on the display, a difference value comparing the capacitances of the plurality of self-capacitance electrodes is set as an initial value,
A stylus pen having a tilt measurement function, wherein the degree of inclination of the stylus pen is calculated by comparing a difference value comparing the capacitances of the capacitive electrodes with the initial value while the stylus pen is inclined.
According to claim 1,
The self-capacitance electrode is a stylus pen having a tilt measurement function, characterized in that the closer the distance from the ground electrode is, the more the capacitance is reduced, and the degree of capacitance reduction of each of the plurality of self-capacitance electrodes is different.
According to claim 2,
The self-capacitance electrode is a stylus pen having a tilt measurement function, characterized in that they are stacked up and down while being separated from each other by a certain distance.
According to claim 3,
The stylus pen is provided with a downwardly inclined nib at the bottom,
The magnetic capacitance electrode is provided on the nib of the stylus pen, the stylus pen having a tilt measurement function.
delete According to claim 1,
The magnetic capacitive electrode is a stylus pen having a tilt measurement function, characterized in that three or more.
Claims 1 to 4 and Claims including a plurality of self-capacitance electrodes whose capacitance varies depending on the distance from the ground electrode provided on the display, and a control unit for calculating the degree of inclination based on the capacitance of the self-capacitance electrode. In the method for measuring the inclination of the stylus pen according to any one of claims 6,
An initial value setting step of setting a difference value in which the capacitances of the plurality of self-capacitance electrodes are compared with each other as an initial value;
A comparison value calculating step of calculating a degree to which the difference values obtained by comparing the capacitances of the plurality of self-capacitance electrodes according to the inclination of the stylus pen are reduced with respect to the initial value; And
And a step of calculating the gradient of the stylus pen based on the reduced degree by stepwise dividing the reduced degree of the difference value calculated in the comparison value calculating step. .
The method of claim 7,
The initial value setting step,
An initial capacitance measurement process for measuring the capacitance of each of the plurality of self-capacitance electrodes while the stylus pen is placed vertically on the display;
An initial capacity comparison process for comparing the capacitance measured in the initial capacity measurement process and calculating a difference value; And
And an initial value storage process of storing the difference value calculated in the initial capacity comparison process as an initial value.
The method of claim 8,
The comparison value calculation step,
A capacitance measurement process for measuring the capacitances of the plurality of self-capacitance electrodes according to the inclination of the stylus pen;
A capacitance comparison step of comparing each capacitance measured in the capacitance measurement step with each other and calculating a difference value; And
A stylus characterized by including a reduction degree calculating process for comparing the difference value calculated in the capacitance comparison process with the initial value set in the initial value setting step and calculating the degree to which the difference value is reduced from the initial value. How to measure the pen angle.

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