CN109508102B - Active stylus and detection method thereof - Google Patents
Active stylus and detection method thereof Download PDFInfo
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- CN109508102B CN109508102B CN201710825743.6A CN201710825743A CN109508102B CN 109508102 B CN109508102 B CN 109508102B CN 201710825743 A CN201710825743 A CN 201710825743A CN 109508102 B CN109508102 B CN 109508102B
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- active stylus
- distance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
Abstract
An active stylus and a detection method thereof. The active stylus includes a first optical ranging circuit, a second optical ranging circuit, and a signal processing circuit. The first optical ranging circuit is arranged on one side of the active stylus pen and used for measuring a first distance between the active stylus pen and a target surface. The second optical ranging circuit is arranged on the other side of the active touch pen and used for measuring a second distance between the active touch pen and the target surface. By using the first distance and the second distance, the signal processing circuit can calculate the inclination angle of the active stylus relative to the target surface and/or detect the rotation direction of the active stylus about the long axis direction as the axis.
Description
Technical Field
The present disclosure relates to touch pens, and particularly to an active touch pen and a detection method thereof.
Background
With the rapid development of touch-sensitive electronic devices (e.g., tablet computers, smart phones, and the like), users can operate their electronic devices with a touch pen, for example, writing text or recording related data on a touch screen with the touch pen. A typical active stylus forms an electric field at the tip of the stylus. When the active stylus touches the touch screen (or the touch pad), the touch screen (or the touch pad) can sense the electric field and calculate the touch position. A typical active stylus can only provide a single writing function. That is, a typical active stylus cannot determine the tilt angle of the active stylus with respect to a target surface (e.g., a touch pad). Furthermore, a general active stylus cannot detect a rotation direction of the active stylus (active stylus) with a long axis direction as an axis.
Disclosure of Invention
The invention provides an active stylus and a detection method thereof, which are used for detecting the inclination angle and/or the rotation direction of the active stylus.
An embodiment of the invention provides an active stylus including a first optical ranging circuit, a second optical ranging circuit, and a signal processing circuit. The first optical ranging circuit is arranged on one side of the active stylus pen and used for measuring a first distance between the active stylus pen and a target surface. The second optical ranging circuit is arranged on the other side of the active touch pen and used for measuring a second distance between the active touch pen and the target surface. The signal processing circuit is coupled to the first optical ranging circuit to receive the first distance and coupled to the second optical ranging circuit to receive the second distance. The signal processing circuit can calculate the inclination angle of the active stylus relative to the target surface by using at least the first distance and the second distance, and/or detect the rotation direction of the active stylus taking the long axis direction as the axis.
The embodiment of the invention provides a detection method of an active touch pen, which comprises the following steps: configuring a first optical ranging circuit at one side of the active stylus; configuring a second optical ranging circuit on the other side of the active stylus; measuring a first distance between the active stylus and the target surface by a first optical ranging circuit; measuring a second distance between the active stylus and the target surface by a second optical ranging circuit; and calculating the inclination angle of the active stylus relative to the target surface by using at least the first distance and the second distance through the signal processing circuit, and/or detecting the rotation direction of the active stylus taking the long axis direction as the axis.
In view of the above, embodiments of the present invention provide an active stylus and a detection method thereof, which can utilize different optical ranging circuits to measure a plurality of distances (e.g., a first distance and a second distance) from the active stylus to a target surface. The active stylus can use these distances to calculate the tilt angle of the active stylus with respect to the target surface and/or detect the rotation direction of the active stylus about the long axis direction.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic diagram illustrating a circuit block (circuit block) and an application scenario of an active stylus according to an embodiment of the invention.
Fig. 2 is a circuit block diagram illustrating the signal processing circuit shown in fig. 1 according to an embodiment of the invention.
Fig. 3A and 3B are schematic diagrams illustrating a circuit block and an application scenario of an active stylus according to another embodiment of the invention.
Fig. 4 is a flowchart illustrating a method for detecting an active stylus according to an embodiment of the invention.
Fig. 5 is a flowchart illustrating a method for detecting an active stylus according to another embodiment of the invention.
Fig. 6 is a flowchart illustrating a method for detecting an active stylus according to another embodiment of the invention.
Description of the symbols
100. 300, and (2) 300: an active stylus;
110: a first optical ranging circuit;
120: a second optical ranging circuit;
130: a signal processing circuit;
140. 340, and (3): a target surface;
190. 390: a nib portion;
210: a pressure sensor unit;
220: a processing unit;
230: a wireless transmission unit;
240: a host;
301: a first direction;
302: a second direction;
310: a button;
θ 1: an inclination angle;
l1: a first distance;
l2: a second distance;
s1: a third distance;
S410-S450, S510-S560: an executing step of detecting the inclination angle by the active stylus;
S610-S640: and an active stylus detection rotation direction execution step.
Detailed Description
The term "coupled" as used throughout this specification, including the claims, may refer to any direct or indirect connection. For example, if a first device couples (or connects) to a second device, it should be construed that the first device may be directly connected to the second device or the first device may be indirectly connected to the second device through some other device or some connection means. Further, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. Elements/components/steps in different embodiments using the same reference numerals or using the same terms may be referred to one another in relation to the description.
Fig. 1 is a schematic diagram illustrating a circuit block of an active stylus 100 according to an embodiment of the invention. The active stylus 100 includes a first optical ranging circuit 110, a second optical ranging circuit 120, and a signal processing circuit 130. The first optical ranging circuit 110 and/or the second optical ranging circuit 120 may be any type of ranging element/circuit according to design requirements. For example, the first optical ranging circuit 110 and/or the second optical ranging circuit 120 may be conventional optical rangefinders or other optical ranging devices/circuits. The details of the operation of the conventional optical distance measuring device are not described herein. The optical ranging circuit may project light onto a target surface and then detect light reflected from the target surface. Based on the detected reflected light, the optical distance measuring circuit can obtain the distance from the optical distance measuring circuit to the target surface.
The first optical ranging circuit 110 and the second optical ranging circuit 120 are disposed on different sides (different positions) of the active stylus 100. For example, but not limited to, the first optical ranging circuit 110 may be disposed at a first side of the pen tip 190 of the active stylus 100, and the second optical ranging circuit 120 may be disposed at a second side of the pen tip 190 of the active stylus 100, as shown in fig. 1. The first optical ranging circuit 110 projects light onto a target surface 140 (e.g., a touch display panel, a touch pad, or any plane) to measure a first distance L1 between the active stylus 100 and the target surface 140. The second optical ranging circuit 120 also projects light onto the target surface 140 to measure a second distance L2 between the active stylus 100 and the target surface 140. The light projecting direction of the first optical ranging circuit 110 and the light projecting direction of the second optical ranging circuit 120 are parallel to the long axis direction of the active stylus 100, and a third distance S1 exists between the first distance L1 and the second distance L2 (i.e. between the optical path of the first optical ranging circuit 110 and the optical path of the second optical ranging circuit 120).
The signal processing circuit 130 in the active stylus 100 is coupled to the first optical ranging circuit 110 and the second optical ranging circuit 120 to receive the distance information of the first distance L1 and the second distance L2, respectively. The signal processing circuit 130 can calculate the tilt angle θ 1 of the active stylus 100 relative to the target surface 140 by using at least the first distance L1 and the second distance L2, and/or detect a rotation direction of the active stylus 100 about the long axis direction (please refer to fig. 3A, fig. 3B, and/or the related description of fig. 6 for details). According to design requirements, the signal processing circuit 130 may employ any geometric algorithm to calculate the first distance L1 and the second distance L2 to obtain the tilt angle θ 1. For example, but not limited to, the signal processing circuit 130 may calculate the first distance L1 and the second distance L2 by the following formula 1 to obtain the inclination angle θ 1.
θ1＝tan-1(S1/(L1-L2)) formula 1
When a user uses an actual pen to write, different writing angles are generated according to different personal habits, so that the handwriting presented can be different. In this embodiment, the active stylus 100 can detect the tilt angle θ 1 of the active stylus 100 relative to the target surface 140, and report the tilt angle θ 1 to a host (e.g., a touch display device). For example, the target surface 140 may be a touch display panel of a host. The active stylus 100 may report the tilt angle θ 1 to the host, and then the host may present different handwriting effects on the touch display panel (the target surface 140) at different writing angles according to the tilt angle θ 1 of the active stylus 100.
Fig. 2 is a circuit block diagram illustrating the signal processing circuit 130 shown in fig. 1 according to an embodiment of the invention. The signal processing circuit 130 includes a pressure sensor unit 210, a processing unit 220, and a wireless transmission unit 230. The Processing Unit 220 is, for example, a Central Processing Unit (CPU), or other programmable general purpose or special purpose Microprocessor (Microprocessor), Digital Signal Processor (DSP), programmable controller, Application Specific Integrated Circuit (ASIC), or other similar components or combinations thereof. The wireless transmission unit 230 may be a global system for mobile communication (GSM) circuit, a Personal Handyphone System (PHS) circuit, a Code Division Multiple Access (CDMA) circuit, a Wideband Code Division Multiple Access (WCDMA) circuit, a Long Term Evolution (LTE) circuit, a Worldwide Interoperability for Microwave Access (WiMAX) circuit, a wireless fidelity (Wi-Fi) circuit, a Bluetooth (Bluetooth) circuit, or other wireless transmission elements/circuits.
The pressure sensor unit 210 is coupled to the processing unit 220. The pressure sensor unit 210 is mainly used to detect whether the active stylus 100 enters a working state. For example, when a user holds the active stylus 100 with a hand to perform operations such as writing text or browsing a web page on a smart phone or a tablet pc, the pressure sensor unit 210 in the signal processing circuit 130 may sense the force of the user's hand holding the active stylus 100, and then transmit the sensing result to the processing unit 220, so as to prompt the active stylus 100 to enter the working mode. On the contrary, when the automatic stylus pen 100 is not held by the user, the pressure sensor unit 210 cannot sense the force of the user's hand holding the active stylus pen 100, so as to prompt the processing unit 220 that the active stylus pen 100 needs to enter the idle mode, thereby saving the power consumption. Therefore, the pressure sensor unit can detect whether the active stylus 100 enters an operating state.
The processing unit 220 is further coupled to the first optical ranging circuit 110 and the second optical ranging circuit 120 for receiving the distance information of the first distance L1 and the second distance L2. The processing unit 220 can calculate the tilt angle θ 1 of the active stylus 100 relative to the target surface 140 by using at least the first distance L1 and the second distance L2. In addition, the wireless transmission unit 230 is coupled to the processing unit 220 to receive the tilt angle θ 1 calculated by the processing unit 220. The wireless transmission unit 230 may transmit the tilt angle θ 1 to the host 240 by using a wireless communication technology (e.g., bluetooth transmission). The host 240 is, for example, an electronic device such as a mobile phone, a tablet computer, a notebook computer, etc., and is not limited herein.
Fig. 3A and 3B are schematic circuit blocks and application scenarios illustrating an active stylus 300 according to another embodiment of the invention. The active stylus 300 includes a button 310, a first optical ranging circuit 110, a second optical ranging circuit 120, and a signal processing circuit 130. The first optical ranging circuit 110 may be disposed at a first side of the pen tip 390 of the active stylus 300, and the second optical ranging circuit 120 may be disposed at a second side of the pen tip 390 of the active stylus 300, and an optical path of the first optical ranging circuit 110 and an optical path of the second optical ranging circuit 120 have a third distance S1 therebetween, as shown in fig. 3A and 3B. The target surface 340, the first optical ranging circuit 110, the second optical ranging circuit 120, and the signal processing circuit 130 shown in fig. 3A and 3B can be analogized by referring to the related descriptions of the target surface 140, the first optical ranging circuit 110, the second optical ranging circuit 120, and the signal processing circuit 130 shown in fig. 1, and therefore are not repeated herein.
The embodiment shown in fig. 3A and 3B is different from the embodiment shown in fig. 1 in that the active stylus 300 shown in fig. 3A and 3B is further configured with a button 310 on the surface of the active stylus 300. The button 310 is coupled to the signal processing circuit 130. The function of the button 310 may be the function of a button provided on a general stylus or other functions according to design requirements. In some embodiments, the function of button 310 may be that of the left mouse button. Generally, when a user holds the active stylus 300, the user rotates the active stylus 300 to turn the button 310 upward (as shown in FIG. 3B) even if the button 310 is located at the side of the active stylus 300 (as shown in FIG. 3A) or other positions. Therefore, the user can rotate the active stylus 300 to rotate the first optical ranging circuit 110 and the second optical ranging circuit 120 to the initial positions. That is, the button 310 may be used to define a reference plane (initial position) of the first optical ranging circuit 110 and the second optical ranging circuit 120.
Referring to fig. 3B, when the first distance L1 measured by the first optical ranging circuit 110 is approximately equal to the second distance L2 measured by the second optical ranging circuit 120, the signal processing circuit 130 may determine that the active stylus 300 is in an "unrotated state", that is, the first optical ranging circuit 110 and the second optical ranging circuit 120 are located at initial positions (reference positions). When the user rotates the active stylus 300 in the first direction 301 (counterclockwise), the active stylus 300 may transition from the position shown in fig. 3B to the position shown in fig. 3A such that the first distance L1 increases and the second distance L2 decreases. When the signal processing circuit 130 detects that the first distance L1 increases and the second distance L2 decreases, the signal processing circuit 130 determines that the active stylus 300 rotates in the first direction 301 around the long axis direction. Similarly, when the signal processing circuit 130 detects that the first distance L1 decreases and the second distance L2 increases, the signal processing circuit 130 determines that the active stylus 300 rotates in the second direction 302 (clockwise) around the long axis.
Therefore, the active stylus 300 shown in fig. 3 can detect the rotation direction of the active stylus 300 about the long axis direction as the axis, and report the rotation direction to a host (e.g., a touch display device). For example, the target surface 340 may be a touch display panel of a host. The active stylus 300 may report the rotation direction thereof to the host, and the host may trigger the corresponding control function according to the rotation direction of the active stylus 300. For example, when a user wants to scroll a web page or convert a page of an electronic book, the user can rotate the active stylus 300 with the long axis as the axis. The host can scroll the web pages or convert the pages of the electronic book according to the rotation direction of the active stylus 300.
Fig. 4 is a flowchart illustrating a method for detecting an active stylus according to an embodiment of the invention. Referring to fig. 1, fig. 2 and fig. 4, in step S410, the pressure sensor unit 210 determines that the active stylus 100 enters the working mode. In step S420, the first optical ranging circuit 110 measures a first distance L1 between the active stylus 100 and the target surface 140 along the optical path, and the second optical ranging circuit 120 measures a second distance L2 between the active stylus 100 and the target surface 140 along the optical path. In step S430, the processing unit 220 determines whether the first distance L1 is the same as the second distance L2. If the first distance L1 is the same as the second distance L2, the active stylus 100 again performs step S420, otherwise, the active stylus 100 performs step S440. In step S440, the processing unit 220 calculates the tilt angle θ 1 of the active stylus 100 relative to the target surface 140 by using at least the first distance L1 and the second distance L2. In step S450, the wireless transmission unit 230 receives the tilt angle θ 1 and transmits the tilt angle θ 1 to the host 240.
Fig. 5 is a flowchart illustrating a method for detecting an active stylus according to another embodiment of the invention. Referring to fig. 1, fig. 2 and fig. 5, in step S510, the pressure sensor unit 210 determines that the active stylus 100 enters the working mode. In step S520, the first optical ranging circuit 110 measures a first distance L1 between the active stylus 100 and the target surface 140 along the optical path, and the second optical ranging circuit 120 measures a second distance L2 between the active stylus 100 and the target surface 140 along the optical path. In step S530, the processing unit 220 determines whether the first distance L1 is the same as the second distance L2. If the first distance L1 and the second distance L2 are the same, the active stylus 100 performs step S540, otherwise, the active stylus 100 performs step S550. In step S540, the processing unit 220 determines whether the number of times of performing the "comparison between the first distance L1 and the second distance L2" (i.e., step S530) reaches 3 times. When the number of the step S530 is less than 3, the active stylus 100 performs the step S520 and the step S530 again.
When the determination result in the step S540 indicates that "the results of the 3 comparisons of the first distance L1 and the second distance L2 are all the same", the processing unit 220 proceeds to the step S545. In step S545, according to design requirements, the processing unit 220 may set the inclination angle θ 1 to 45 degrees, or set the inclination angle θ 1 successfully calculated in the previous time as the inclination angle θ 1 in the current time. After completing step S545, the processing unit 220 may perform step S560. In step S560, the processing unit 220 can transmit the inclination angle θ 1 set in step S545 to the host 240 via the wireless transmission unit 230.
When the processing unit 220 determines in step S530 that the first distance L1 is different from the second distance L2, the active stylus 100 performs step S550. In step S550, the processing unit 220 calculates the tilt angle θ 1 of the active stylus 100 relative to the target surface 140 by using at least the first distance L1 and the second distance L2. In step S560, the processing unit 220 can transmit the tilt angle θ 1 calculated in step S550 to the host 240 via the wireless transmission unit 230.
Fig. 6 is a flowchart illustrating a method for detecting an active stylus according to another embodiment of the invention. Please refer to fig. 2, fig. 3A, fig. 3B and fig. 6. In step S610, the processing unit 220 determines that the active stylus 300 enters the working mode according to the sensing result of the pressure sensor unit 210. In step S620, the first optical ranging circuit 110 measures the first distance L1 between the active stylus 300 and the target surface 340 along the optical path a plurality of times, and the second optical ranging circuit 120 measures the second distance L2 between the active stylus 300 and the target surface 340 along the optical path a plurality of times. In step S630, the processing unit 220 determines whether the active stylus 300 rotates according to the first distance L1 and the second distance L2. For example, when the change of the first distance L1 is consistent with the change of the second distance L2, the active stylus 300 is determined not to rotate. The phrase "the change of the first distance L1 is consistent with the change of the second distance L2" includes that the increase of the first distance L1 is the same as the increase of the second distance L2, and/or the decrease of the first distance L1 is the same as the decrease of the second distance L2, and/or that neither the first distance L1 nor the second distance L2 is changed. When the determination result of the step S630 shows that the active stylus 300 does not rotate, the active stylus 300 performs the steps S620 and S630 again.
When the first distance L1 becomes larger and the second distance L2 becomes smaller, or when the first distance L1 becomes smaller and the second distance L2 becomes larger, step S630 may determine that the active stylus 300 is rotated. When the determination result of the step S630 shows that the active stylus 300 is rotated, that is, the active stylus 300 rotates in the first direction 301 or the second direction 302 with the long axis as the axis, the active stylus 300 performs the step S640. In step S640, the processing unit 220 transmits the rotation direction of the active stylus 300 to the host 240 via the wireless transmission unit 230.
In summary, the active stylus according to the embodiments of the invention may be provided with a plurality of sets of optical ranging circuits at different positions of the tip portion. The optical ranging circuit can project light onto the target surface, sense reflected light reflected from the target surface, and obtain distance information according to the reflected light. Different distances may be sensed by the optical ranging circuit at different locations. According to the distances between the active stylus and the target surface, the active stylus can calculate the inclination angle between the active stylus and the target surface, and/or detect the rotation direction of the active stylus about the long axis direction as the axis. According to different inclination angles of the active stylus, the host can present different handwriting effects. Depending on the different rotation directions of the active stylus, the host may trigger corresponding control functions, such as performing page selection.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (11)
1. An active stylus, comprising:
the first optical ranging circuit is arranged on one side of the active touch pen and used for measuring a first distance between the active touch pen and a target surface;
a second optical ranging circuit, disposed on the other side of the active stylus, for measuring a second distance between the active stylus and the target surface; and
a signal processing circuit coupled to the first optical ranging circuit for receiving the first distance and coupled to the second optical ranging circuit for receiving the second distance, for calculating an inclination angle of the active stylus with respect to the target surface or detecting a rotation direction of the active stylus about a long axis direction as an axis by using at least the first distance and the second distance,
the light projection direction of the first optical ranging circuit and the light projection direction of the second optical ranging circuit are parallel to the long axis direction of the active stylus.
2. The active stylus of claim 1, wherein the first optical ranging circuit is disposed at a first side of a tip portion of the active stylus and the second optical ranging circuit is disposed at a second side of the tip portion of the active stylus.
3. The active stylus of claim 1, wherein the first optical ranging circuit and the second optical ranging circuit have a third distance therebetween.
4. The active stylus of claim 1, wherein the signal processing circuitry comprises:
the pressure sensor unit is used for detecting whether the active stylus enters a working state or not;
a processing unit coupled to the first optical ranging circuit and the second optical ranging circuit to receive the first distance and the second distance for calculating the tilt angle using at least the first distance and the second distance; and
and the wireless transmission unit is coupled to the processing unit to receive the inclination angle and is used for transmitting the inclination angle to the host.
5. The active stylus of claim 1, further comprising:
and the button is arranged on the surface of the active stylus and is coupled to the signal processing circuit.
6. The active stylus of claim 1, wherein the signal processing circuit determines that the active stylus is in a non-rotated state when the first distance is equal to the second distance, determines that the active stylus is rotated in a first direction about the long axis when the first distance increases and the second distance decreases, and determines that the active stylus is rotated in a second direction about the long axis when the first distance decreases and the second distance increases.
7. A method for detecting an active stylus includes:
configuring a first optical ranging circuit at one side of the active stylus;
configuring a second optical ranging circuit on the other side of the active stylus;
measuring a first distance between the active stylus and a target surface by the first optical ranging circuit;
measuring, by the second optical ranging circuit, a second distance between the active stylus and the target surface; and
calculating an inclination angle of the active stylus with respect to the target surface or detecting a rotation direction of the active stylus about a long axis direction as an axis by using at least the first distance and the second distance through a signal processing circuit,
the light projection direction of the first optical ranging circuit and the light projection direction of the second optical ranging circuit are parallel to the long axis direction of the active stylus.
8. The method of claim 7, wherein the first optical ranging circuit is disposed at a first side of a nib portion of the active stylus and the second optical ranging circuit is disposed at a second side of the nib portion of the active stylus.
9. The method of claim 7, wherein the first optical ranging circuit and the second optical ranging circuit have a third distance therebetween.
10. The method of detecting an active stylus of claim 7, further comprising:
and arranging a button on the surface of the active stylus.
11. The method of claim 7, wherein the step of detecting a rotation direction of the active stylus about a long axis comprises:
when the first distance is equal to the second distance, the signal processing circuit determines that the dynamic stylus is in a non-rotating state;
when the first distance increases and the second distance decreases, the signal processing circuit determines that the active stylus rotates towards a first direction by taking the long axis direction as an axis; and
when the first distance decreases and the second distance increases, the signal processing circuit determines that the active stylus rotates in a second direction around the long axis direction.
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| DE10019165A1 (en) * | 2000-04-12 | 2001-10-18 | Arman Emami | Portable digital pen for data input, recording and processing, especially for text input and processing, is able to work with text or data written down on all manner of surfaces, even the back of a hand or on someone's trousers |
| KR100418423B1 (en) * | 2001-03-14 | 2004-02-11 | 주식회사 나비시스닷컴 | Apparatus for inputting using positional recognition of a pen |
| KR100408518B1 (en) * | 2001-04-12 | 2003-12-06 | 삼성전자주식회사 | Pen input device and Measuring method of coordinate |
| CN101398720B (en) * | 2007-09-30 | 2010-11-03 | 联想(北京)有限公司 | Pen interactive device |
| WO2011154950A1 (en) * | 2010-06-11 | 2011-12-15 | N-Trig Ltd. | Object orientation detection with a digitizer |
| TWI502434B (en) * | 2013-08-02 | 2015-10-01 | Wistron Corp | Touch module and touch positioning method thereof |
| CN105677065B (en) * | 2016-01-04 | 2019-01-01 | 京东方科技集团股份有限公司 | Remote control touch device and method for display screen |
| CN106249921A (en) * | 2016-08-04 | 2016-12-21 | 捷开通讯科技(上海)有限公司 | The control system of pointer and method |
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