KR102242529B1 - Stylus pen and display device using the same - Google Patents

Abstract

The present invention relates to a stylus pen and a display device using the same, and in particular, when a touch driving voltage is received from a touch panel, the stylus outputs the AC signal so that the AC signal can be transmitted to a user's hand holding a case. It is a technical task to provide a pen and a display device using the same.

Description

A stylus pen and a display device using the same {STYLUS PEN AND DISPLAY DEVICE USING THE SAME}

The present invention relates to a stylus pen and a display device using the same.

Flat panel displays (FPDs) (hereinafter simply referred to as'display devices') are used in various types of electronic products including mobile phones, tablet PCs, and notebook computers. Flat panel displays include a liquid crystal display (LCD), a plasma display (PDP), an organic light emitting display (OLED), and the like, and recently, an electrophoretic display ( EPD: ELECTROPHORETIC DISPLAY) is also widely used.

A touch panel is a type of input device that is installed on a display device and allows a user to directly touch a screen with a finger or a pen while viewing the display device to input information.

As a method of sensing a touch, there is a method of sensing a touch using a change in capacitance. In the capacitive method, when a human body or a conductive material contacts the touch panel, a change in capacitance is sensed to determine the presence or absence of a touch and a touch coordinate.

The capacitive method can also be applied to a method of determining the presence or absence of a touch by a pen. For example, when there is a conductive material in the pen, the presence or absence of a touch may be determined using a change in capacitance between the pen and the touch panel.

In addition, as described in US Patent Publication No. 2013-0106720 and the like, when an active pen that outputs a pen voltage so that the touch sensing unit detects the pen is used, a touch panel using a capacitive method is used, and The presence or absence of a touch may be determined by the active pen.

In addition, as described in Korean Patent Laid-Open No. 10-2014-0022222, etc., when a stylus pen that wirelessly outputs a pen signal when a touch drive voltage is received from a touch panel is used, a display device equipped with the touch panel Receives the pen signal, and determines the touched position of the stylus pen on the touch panel.

In a display device that determines whether or not a stylus is touched, the touch panel may also be used to determine whether or not a user's finger is touched.

A user who uses the stylus pen comes into contact with the touch panel with the side of his hand due to his writing habit. In this case, the display device determines that there is a touch on a portion where the side of the hand is in contact.

However, since the area determined to have a touch due to the contact of the side of the hand is not a touch area intended by the user, the touch area should not be recognized as a touch. In this case, the conventional display device performs a palm rejection function in order not to recognize the touch area as a touch. However, since it is difficult to distinguish between the touch by the side of the hand and the touch by the finger, in the conventional display device, it is difficult to remove the touch by the side of the hand.

To further explain, since the determination of the presence or absence of a touch by the finger and the determination of the presence or absence of the touch by the stylus pen are made individually, they do not affect each other. However, due to the user's habit of holding the stylus pen, when the stylus pen is used, the side of the user's hand touches the touch panel. In this case, raw data used for determining the presence or absence of a touch is generated by the touch by the side of the hand. Such raw data may be a disturbing factor when determining the presence or absence of a touch by the stylus pen. Accordingly, in addition to the touch area by the stylus pen, an unintended touch area may be detected.

The present invention is to solve the above-described problem, and when a touch driving voltage is received from a touch panel, a stylus pen and a stylus pen that outputs the AC signal so that the AC signal can be transmitted to the hand of a user holding the case It is a technical problem to provide a display device.

A stylus pen according to the present invention for achieving the above object includes: a transmission/reception unit for wirelessly transmitting a pen signal when a touch driving voltage is received from a touch panel; A case covering the transmission/reception unit; And an AC signal generator for outputting an AC signal to the surface of the case when the touch driving voltage is received.

In order to achieve the above object, a display device according to the present invention includes: a touch panel in which touch electrodes are formed; A panel on which the touch panel is formed and an image is output; A stylus pen for wirelessly transmitting a pen signal when a touch driving voltage is received from the touch panel; An antenna formed on the touch panel; And a touch sensing unit that determines whether or not there is a touch on the touch panel by using the detection signal received from the touch panel and the pen signal received through the antenna, wherein the stylus pen communicates with the surface of the stylus pen. Output the signal.

According to the present invention, when the touch panel is touched by the stylus pen, in the finger mode, even if the user's palm, the side of the hand, etc. come into contact with the touch panel, the contact is not recognized as a touch. Therefore, when there is a touch by the stylus pen, the touch sensitivity can be improved.

In addition, according to the present invention, the user can feel various vibrations or tactile sensations by the AC signal output through the stylus pen.

1 is an exemplary view showing a configuration of a display device according to the present invention.
2 is a configuration diagram of a touch panel applied to a display device according to an embodiment of the present invention.
Figure 3 is a block diagram showing the internal configuration of the styler pen according to the present invention.
Figure 4 is an exemplary view showing the internal configuration of the styler pen according to the present invention.
5 is an exemplary view showing a method of outputting an AC signal acting as noise by the styler pen according to the present invention.
6 is an exemplary view showing a method of outputting an AC signal acting as a haptic signal by the styler pen according to the present invention.

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

1 is an exemplary view showing a configuration of a display device according to the present invention.

In a display device equipped with a touch panel using a capacitive method, when a person's body or a conductive material contacts a touch sensor, a change in capacitance is sensed to determine the presence or absence of a touch, and the correct coordinates touched are determined.

The display device according to the present invention determines the presence or absence of a touch by a finger using sensing signals received from a touch panel using a capacitive method.

In addition, the display device according to the present invention may determine the presence or absence of a touch by the stylus pen using a pen signal wirelessly received through a stylus pen in proximity or contact with the touch panel.

To this end, the display device according to the present invention supplies a touch driving voltage to the touch panel. A stylus pen close to or in contact with the touch panel receives the touch driving voltage and then wirelessly outputs the pen signal corresponding to the touch driving voltage.

The pen signal is received by an antenna provided in the display device according to the present invention, and the display device according to the present invention can determine whether or not the stylus is touched by using the pen signal.

As described above, the stylus pen may wirelessly output the pen signal according to the touch driving voltage. Among the components of the stylus pen, a configuration for wirelessly outputting the pen signal may be configured in various forms known at present.

For example, the display device according to the present invention includes a stylus pen, an input system, and a touch detection method described in Publication No. 10-2014-0022222 filed by the present applicant (hereinafter, simply referred to as'public technical literature'). You can use

Particularly, the stylus pen applied to the display device according to the present invention may include all of the basic configurations of the stylus pen described in the above public technical literature. Accordingly, in the following description, the same or similar content as described in the above-described published technical literature will be briefly described.

However, the basic structure of the stylus pen according to the present invention, that is, a structure for wirelessly outputting the pen signal so that a touch by the stylus pen can be sensed, in addition to the structure of the stylus pen described in the public technical literature, It can be configured in various forms that are currently known.

To further explain, the stylus pen according to the present invention performs a basic function of outputting the pen signal to a wireless communication network and a function of outputting an AC signal to be described below. Among them, the transmission/reception unit of the stylus pen for executing the basic function of outputting the pen signal may be configured using the configurations described in the public technical literature or currently known configurations. The function of outputting the AC signal is a core technology of the present invention.

In the display device according to the present invention performing the functions as described above, as shown in FIG. 1, a touch panel 500 in which touch electrodes are formed, a panel in which the touch panel is formed, and an image is output ( 700), when a touch driving voltage is received from the touch panel 500, a stylus pen 100 for wirelessly transmitting a pen signal, an antenna (not shown) formed on the touch panel, and received from the touch panel 500 A touch sensing unit 600 for determining the presence or absence of a touch on the touch panel 500 using a detection signal and the pen signal received through the antenna, and gate lines GL1 to A gate driver 200 sequentially supplying scan pulses to a GLg), a data driver 300 supplying a data voltage to data lines DL1 to DLd formed on the panel 700, and the gate driver 200 ) And a control unit 400 that generates control signals for controlling the data driver 300. In particular, the stylus pen 100 may output an AC signal to the surface of the stylus pen 100.

First, the panel 700 may be various types of panels such as a liquid crystal panel, an organic light emitting panel, or an electrophoretic display panel.

The panel 700 is formed by bonding a first substrate and a second substrate. An intermediate layer is formed between the first substrate and the second substrate.

The first substrate and the second substrate may be made of glass, plastic, metal, or the like.

The intermediate layer may have different configurations depending on the type of the display device according to the present invention. For example, when the display device according to the present invention is a liquid crystal display device (LCD), the intermediate layer may include a liquid crystal. When the display device according to the present invention is an organic light emitting display device (OLED), the intermediate layer may include an organic compound that outputs light. In this case, the intermediate layer is formed on the first substrate. When the display device according to the present invention is an electrophoretic display device (EPD), the intermediate layer may include an electrophoretic dispersion or the like.

Hereinafter, for convenience of description, a liquid crystal display will be described as an example of the present invention, but the present invention is not limited thereto. That is, the present invention can be applied to various types of display devices to which various touch panels are applied.

When the panel 700 is a liquid crystal panel, a first substrate (TFT substrate) of the panel 700 includes a plurality of data lines DL1 to DLd, and a plurality of gate lines crossing the data lines ( GL1 to GLg), thin film transistors (TFTs) formed in pixels formed at intersections of the data lines and the gate lines, and data formed in each of the pixels. Pixel electrodes for charging a voltage and common electrodes for driving a liquid crystal charged in the pixel are formed together with the pixel electrode.

That is, the pixels are arranged in a matrix form in each area where the data lines DL1 to DLd and the gate lines GL1 to GLg intersect, and each of the pixels includes the TFT, the pixel electrode, and the A common electrode is formed.

A black matrix (BM) and a color filter are formed on the second substrate (CF substrate) of the panel 700.

Next, the control unit 400 receives timing signals such as a data enable signal (Data Enable, DE) and a dot clock (CLK) from an external system (not shown), and the data driver 300 and the gate driver ( Control signals GCS and DCS for controlling the operation timing of 200) are generated. The external system drives an imaging device to which the display device according to the present invention is applied. The imaging device may be a TV, a monitor, a smart phone, or a tablet PC.

The gate control signals GCS generated by the controller 400 include a gate start pulse GSP, a gate shift clock GSC, and a gate output enable signal GOE.

The data control signals DCS generated by the control unit 400 include a source start pulse (SSP), a source shift clock signal (SSC), a source output enable signal (SOE), a polarity control signal (POL), and the like. do.

In addition, the controller 400 rearranges input image data input from the external system and outputs the rearranged image data to the data driver 300.

The control unit 400 may generate a control signal for controlling an operation timing of the touch sensing unit 600 and transmit the generated control signal to the touch sensing unit 600.

In order to perform the functions as described above, the control unit 400 includes a receiving unit receiving the input image data, the timing signals, and various other signals from the external system, and the input image among signals received from the receiving unit. By rearranging data to fit the liquid crystal panel 700, an image data processing unit for generating rearranged digital image data and signals received from the receiving unit are used to control the gate driver 200 and the data driver 300 And a control signal generator for generating the gate control signal GCS and the data control signal DCS. The control signal generator may generate a control signal for controlling the touch sensing unit 600.

Next, the data driver 300 converts the image data input from the control unit 400 into the data voltage, and converts the data voltage for one horizontal line into the data voltage for each horizontal period in which a scan pulse is supplied to the gate line. Supply to the data lines. That is, the data driver 300 converts the image data into a data voltage using gamma voltages supplied from a gamma voltage generator (not shown) and outputs the converted image data to the data lines.

The data driver 300 shifts a source start pulse (SSP) transmitted from the control unit 400 according to a source shift clock (SSC) to generate a sampling signal. Further, the data driver 300 latches the image data RGB input according to the source shift clock SSC according to the sampling signal, changes it to the data voltage, and then enables the source output. In response to an Output Enable (SOE) signal, the data voltage is supplied to the data lines in units of horizontal lines.

To this end, the data driver 300 may include a shift register unit, a latch unit, a digital to analog conversion unit, and an output buffer.

Next, the gate driver 200 shifts the gate start pulse (GSP) transmitted from the control unit 400 according to a gate shift clock (GSC), and sequentially shifts the gate lines ( A scan pulse having a gate-on voltage Von is supplied to GL1 to GLg. In addition, the gate driver 200 supplies a gate-off voltage Voff to the gate lines GL1 to GLn during the remaining period when the scan pulse having the gate-on voltage Von is not supplied.

In the above description, the data driver 300, the gate driver 200, and the control unit 400 have been described as being independently configured, but at least one of the data driver 300 or the gate driver 200 It may be configured in the control unit 400.

Next, the touch panel 500 is formed on the panel 700 by using a capacitive method. The touch panel may be formed on the panel 700 in an in-cell type, an on-cell type, an add-on type, or a hybrid in-cell type. In the in-cell type touch panel, the touch electrodes are embedded in the panel 700. The on-cell type touch panel is directly formed on an upper surface of a substrate constituting the panel 700. The add-on type touch panel is manufactured independently from the panel 700 that outputs an image, and then is attached to the panel 700. In the hybrid in-cell type touch panel, one of the touch electrodes constituting the touch panel is formed on a first substrate constituting the panel 700, and the other is a second substrate constituting the panel 700 Is formed in

The touch panel 500 may be configured in a mutual method or a self-cap method. The touch panel 500 using the mutual method includes driving electrodes sequentially supplied with a touch driving voltage and receiving electrodes transmitting a sensing signal generated by the touch driving voltage to the touch sensing unit 600. . The driving electrodes and the receiving electrodes are formed on the touch panel 500 so as to cross each other perpendicularly. The driving electrodes and the receiving electrodes are collectively referred to as the touch electrode. The touch electrodes applied to the touch panel 500 using the self-cap method are formed in a block shape, and each touch electrode is individually connected to the touch sensing unit 600.

Hereinafter, for convenience of explanation, a mutual type touch panel consisting of the driving electrodes and the receiving electrodes will be described as an example of the touch panel 500 to which the present invention is applied. When there are six driving electrodes, as shown in FIG. 1, the driving electrodes are connected to the touch sensing unit 600 through a first driving electrode line TL1 to a sixth driving electrode line TL6. When the number of the receiving electrodes is 6, the receiving electrodes are connected to the touch sensing unit 600 through a first receiving electrode line RL1 to a sixth receiving electrode line RL6, as shown in FIG. 1. A specific configuration of the touch panel 500 will be described with reference to FIG. 2.

Next, the touch sensing unit 600 detects the presence or absence of a touch on the touch panel 500 by using detection signals or pen signals received from the touch panel 500. In this case, the touch sensing unit 600 may determine whether a finger touches or not and a stylus pen 100 touches.

As described above, when the touch panel 500 is configured in a mutual manner, the touch sensing unit 600 sequentially touches the driving electrodes formed on the touch panel 500 in a finger mode. After supplying the driving voltage, the touch panel may determine whether or not the user's finger touches using the sensing signals received through the receiving electrodes. For example, when a user's finger contacts the touch panel 500, a sensing signal induced by the touch driving voltage is transmitted to the touch sensing unit 600 through the receiving electrodes. The touch sensing unit 600 analyzes the detection signal and determines whether or not there is a touch on the touch panel 500.

In addition, in the pen mode, the touch sensing unit 600 uses the pen signal received from the stylus pen 100 through a wireless communication network, and whether or not touch is performed by the stylus pen 100 on the touch panel. Can be judged.

In order to perform the function as described above, the touch sensing unit 600 supplies the touch driving voltage to the driving electrodes through the driving electrode lines TL1 to TL6, as shown in FIG. 1. A driver 610 for receiving the sensing signal from the receiving electrodes through the receiving electrode lines RL1 to RL6, and a receiving unit 620 for determining whether or not there is a touch on the touch panel 500, and the And a pen sensing unit 630 for determining the presence or absence of a touch on the touch panel 500 by using the pen signal received through an antenna.

The driver 610 may sequentially supply the touch driving voltage to the driving electrodes in the finger mode, and in the pen mode, the touch driving voltage may be sequentially supplied to the receiving electrodes as well as the driving electrodes. Can supply. The configurations and functions of the driving unit 610 and the receiving unit 620 are the same as the configurations and functions of the driving unit and the receiving unit provided in a touch sensing unit that are currently generally used, and thus detailed descriptions thereof will be omitted.

The configuration and function of the pen sensing unit 630 are the same as the configuration and function of the touch controller described in the published technical literature. For example, the pen detection unit 630 is connected to the antenna, an amplifier for amplifying a voltage difference received at both ends of the antenna, a filter unit connected to the amplifier to remove noise, and connected to the filter unit It may include a converter for converting an analog signal into a digital signal, and a signal processor for collecting the digital signal and extracting the presence or absence of a touch on the touch panel 500 and a touch coordinate.

The presence/absence of a touch and a touch coordinate determined by the receiving unit 620 or the pen detecting unit 630 may be transmitted to the external system through the control unit 400.

Next, the antenna (not shown) is formed on the touch panel 500, receives the pen signal received from the stylus pen 100 through a wireless communication network, and transmits it to the touch sensing unit 600 Performs the function of The configuration and function of the antenna is the same as the configuration and function described in the published technical literature.

Finally, the stylus pen 100 performs a function of wirelessly transmitting the pen signal when a touch driving voltage is received from the touch panel 500, as described in the published technical literature. The pen signal is transmitted to the pen sensing unit 630 through the antenna.

In particular, the stylus pen 100 applied to the present invention outputs an AC signal to the surface of the stylus pen 100.

First, the AC signal is recognized as noise when the receiving unit 620 determines whether or not there is a touch on the touch panel 500.

For example, the AC signal is transmitted through a user's hand holding the stylus pen 100. When the user's hand is in contact with the touch panel 500, noise is transmitted to the receiving unit 620 through the receiving electrodes by the AC signal. The pattern of noise generated by the AC signal is formed in a form different from the pattern of noise generated by a general touch panel, and the magnitude of noise generated by the AC signal is greater than the magnitude of noise generated by the general touch panel. It appears large. Accordingly, the receiving unit 620 can accurately recognize the noise generated by the AC signal, and thus, while the stylus pen 100 is touching, the touch by the user's hand can be removed. .

In more detail, the AC signal, for example, AC voltage generated from the stylus pen 100 is transmitted to the user's hand holding the stylus pen 100, and the hand is transferred to the touch panel 500 ), the noise generated by the AC signal is transmitted to the receiving unit 620 through the receiving electrode. The noise is included in raw data generated by the receiving unit 620.

In this case, pseudorandom noise generated by the AC signal appears in a specific form in the raw data. For example, as described above, the pattern of the raw data due to the noise is different from the pattern of the raw data generated when there is a touch and the pattern of the raw data generated when there is general noise. The size of the raw data due to the noise may be larger than the size of the raw data generated when there is a touch and the size of the raw data generated when there is general noise. The difference may be caused by changing the magnitude or frequency of the voltage of the AC signal.

Accordingly, the receiving unit 620 can easily distinguish noise generated by the AC signal. The presence of noise generated by the AC signal means that the user is holding the stylus pen 100 and is touching the touch panel 500 using the stylus pen 100.

When the touch panel 500 is touched using the stylus pen 100, a touch by a user's finger is unnecessary. Accordingly, when the noise generated by the AC signal is received, the receiver 620 determines that the hand of the user using the stylus pen 100 unnecessarily contacts the touch panel 500. In this case, in the finger mode, the receiving unit 620 does not recognize the noise generated by the AC signal as a touch, and in the pen mode, it is possible to determine whether or not there is a touch by the stylus pen 100. . The finger mode and the pen mode are repeated with a certain period.

Therefore, when there is a touch by the stylus pen 100, in the finger mode, unnecessary touch by the user's hand is not recognized as a touch. Accordingly, when there is a touch by the stylus pen 100, in the finger mode, the touch by the hand can be efficiently removed.

According to the present invention as described above, a palm rejection function that does not recognize a touch unnecessarily generated by the back of the hand, the side of the hand, or the palm as a touch can be efficiently performed.

Second, the AC signal may be a haptic signal that allows a user who touches the touch panel 500 while holding the stylus pen 100 to feel vibration or tactile sensation.

For example, when an image requiring vibration or tactile sensation is output through the touch panel 500, the control unit 400 transmits haptic information through the wireless communication unit 410. The wireless communication unit 410 may transmit the haptic information using a wireless communication method such as Bluetooth. The wireless communication unit 410 may be independently formed as shown in FIG. 1, but may be formed inside the control unit 400 or inside the touch sensing unit 600. The haptic information includes information on the intensity of the vibration, the shape of the vibration, and the like.

For example, an image such as a sandy beach is output through the panel 700, and the stylus pen 100 is touching a location corresponding to a location of the touch panel 500 where the sandy beach is output. When it is determined, the controller 400 transmits haptic information through the wireless communication unit 410 so that the user can feel the feeling of sand. In this case, the stylus pen 100 receiving the haptic information adjusts the magnitude of the AC voltage and the frequency of the AC voltage according to the haptic information, and then outputs the AC signal having the magnitude and frequency. do. The user holding the stylus pen 100 may indirectly feel the touch of sand due to the vibration generated by the AC signal. In this case, the AC signal performs the function of the haptic signal.

As another example, when the user selects a button output through the panel, the control unit 400 transmits haptic information through the wireless communication unit 4100 to allow the user to feel that the button has been selected. In this case, the stylus pen 100 receiving the haptic information adjusts the magnitude, frequency, and duration of the AC voltage according to the haptic information, and then outputs the AC signal having the magnitude and duration. A user who grabs the stylus pen 100 and selects a button output through the panel 700 can confirm that the button is normally selected by the vibration generated by the AC signal.

To further explain, when a haptic function is required, the haptic information is transmitted to the stylus pen 100 using a wireless communication method such as Bluetooth. The stylus pen 100 receiving the haptic information generates the AC signal, that is, electric vibration, having a size and frequency corresponding to the haptic information. The AC signal or electric vibration is the haptic signal. According to the present invention as described above, a user using the stylus pen 100 can feel various types of vibrations and tactile sensations.

The AC signal generating the electric vibration not only functions as the haptic signal, but also functions as the noise. For example, when the AC signal generating the electric vibration is output through the stylus pen 100, it means that the user is using the stylus pen 100. In this case, the receiving unit 620 determines that the noise generated by the AC signal is generated by the palm, the back of the hand, the side of the hand, etc., and recognizes the noise generated by the AC signal as a touch in the finger mode. I never do that. Therefore, when there is a touch by the stylus pen 100, unnecessary touch by the hand is not recognized.

2 is a configuration diagram of a touch panel applied to a display device according to an embodiment of the present invention.

When the touch panel 500 includes the six driving electrodes TX1 to TX6 and the six receiving electrodes RX1 to RX6, the driving electrodes and the receiving electrodes are the panel ( It is formed in the display area 510 corresponding to the area in which the image is output at 700. The driving electrodes are connected to the touch sensing unit 600 through the driving electrode lines TL1 to TL6, and the receiving electrodes are connected to the touch sensing unit 600 through the receiving electrode lines RL1 to RL6. Is connected with.

The antenna 520 is formed on the touch panel 500. The antenna 520 may be formed outside the touch panel 500.

The touch panel 500 includes driving electrode pads P1 connected to each of the driving electrode lines TL1 to TL6, and receiving electrode pads P2 connected to each of the receiving electrode lines RL1 to RL6. And antenna pads P3 connected to the antenna 520 are formed.

The driving electrode lines, the receiving electrode lines, and the antenna are electrically connected to the touch sensing unit 600 through the pads. In particular, the driving electrode lines are connected to the driving unit 610, the receiving electrode lines are connected to the receiving unit 620, and the antenna 520 is connected to the pen sensing unit 630. However, the receiving electrode lines may be connected to the driving unit 610 in the pen mode. In this case, the driving unit 610 sequentially applies the touch driving voltage to the receiving electrodes through the receiving electrode lines. Can supply. That is, the receiving electrode lines are connected to the receiving unit 620 in the finger mode and transmit the sensing signals to the receiving unit 620. However, in the pen mode, the receiving electrode lines are sequentially connected to the driving unit 610 to sequentially supply the touch driving voltage to the receiving electrodes.

3 is a block diagram showing the internal configuration of the styler pen according to the present invention, Figure 4 is an exemplary view showing the internal configuration of the styler pen according to the present invention, Figure 5 is a styler pen according to the present invention acting as noise It is an exemplary diagram showing a method of outputting an AC signal, and FIG. 6 is an exemplary diagram showing a method of outputting an AC signal acting as a haptic signal by the styler pen according to the present invention.

The styler pen 100 according to the present invention, as shown in FIG. 3 and FIG. 4, transmits/receives a pen signal wirelessly when a touch driving voltage is received from the touch panel 500, and the transmission/reception And a case 150 covering the part and an AC signal generator 100b for outputting the AC signal to the surface of the case 150 when the touch driving voltage is received.

First, the transmission/reception unit 100a may include all the configurations of the styler pen described in the published technical literature. Therefore, in the following, the transmission/reception unit 100a will be briefly described.

The transmission/reception unit 100a may be formed in the same shape as the first embodiment described in the public technical literature, as shown in FIGS. 3 and 4, and the second It may be formed in the same form as in the embodiment. In addition, the transmission/reception unit 100a may be formed in various forms capable of transmitting the pen signal wirelessly when the touch driving voltage is received.

For example, in the transmission/reception unit 100a, the primary coil 140 and the secondary coil 120 alternate with each other in a magnetic core 135, as shown in FIGS. 3 and 4. Can be rolled up. The case 150 of the stylus pen 100 may be formed of a conductive material. The transmission/reception unit 100a is mounted inside the case 150.

The transmission/reception unit 100a is external to the case through the ends of the primary coil 140, the secondary coil 120, the resonant capacitor 110, the magnetic core 135, and the case 150. It includes a conductive tip 101 protruding into.

The tip 101 is insulated from the conductive case 150. The case 150 having conductivity is connected to the ground part 500, for example, a user's body.

The switch 130 for turning on or off the secondary coil 120 and the resonant capacitor 110 may be formed of a spring or an elastic rubber. A first insulating layer 103 may be provided between the switch 130 and the tip 101 so that the switch 130 is insulated from the tip 101.

The switch 130 is operated by a pressure applied when the tip 101 presses the touch panel 500. For example, when the tip 101 presses the touch panel 500 with a predetermined pressure or more, the switch 130 is closed, and the internal resonance circuit forms a closed circuit.

The switch 130 is connected to the secondary coil 120, and a second insulating layer 107 may be provided between the switch 130 and the magnetic core 135.

One end of the primary coil 140 is connected to the tip 101 and the other end is connected to the ground terminal 125 of the case 150.

The basic operation of the stylus pen and a method of sensing a touch by the pen sensing unit 630 are as follows.

One end of the primary coil 140 connected to the tip 101 forms the touch electrode and a sensing capacitor 250 formed on the touch panel 500.

Accordingly, the touch driving voltage supplied to the touch electrode drives the primary coil 140 through the sensing capacitor 250. When a signal by the touch driving voltage is induced in the primary coil 140, the second mutual indentation M12 generated between the primary coil 140 and the magnetic core 135 A resonant circuit composed of the secondary coil 120 and the resonant capacitor 110 is driven.

The touch electrode, for example, the touch driving voltage transmitted from the driving unit 610 through the driving electrode TX, and the electromagnetic of a resonance circuit including the secondary coil 120 and the resonance capacitor 110 The primary coil, the secondary coil, and the resonant capacitor are configured so that the resonant frequency is the same. In this case, due to electromagnetic resonance, the signal strength increases as time elapses. The other end of the primary coil 140 is grounded through a grounding capacitor Ch made up of a human body and a hand in contact with the case 150.

The switch 130 is closed when the tip 101 is pressed against the touch panel 500, and electromagnetic resonance occurs only when the switch 130 is closed, so that the input detection of the transmission/reception unit 100a is It is possible. For example, even if the stylus pen is close to the touch panel 500, the stylus pen does not operate unless it is pressed to some extent, so that a malfunction can be prevented.

The magnetic field signal generated during electromagnetic resonance is transmitted to the antenna 510 located outside the touch panel 500. In this case, the antenna 510 functions as a tertiary coil. The pen sensing unit 630 connected to the antenna 510 detects a voltage difference applied to both ends of the antenna 510.

In more detail, when the stylus pen 100 touches the touch panel, a signal applied to the sensing capacitor 250 through the tip 101 is transmitted to the primary coil 140. The signal means a signal generated by the touch driving voltage. The signal transmitted to the primary coil 140 is transmitted to the secondary coil 120 by the first mutual inductance M12. The secondary coil 120 and the resonant capacitor 110 form a closed circuit when the switch 130 is closed. Accordingly, the signal resonates, and as time elapses, the magnitude of the signal of the secondary coil 120 increases. The magnetic field signal of the secondary coil 120 in the resonance circuit is the second mutual inductance formed between the secondary coil 120 (or the primary coil 140) and the antenna 510. It is guided by the antenna 510. A signal transmitted from the stylus pen 100 to the pen sensing unit 630 through the antenna according to the above-described principle is referred to as the pen signal.

The above-described process is executed when the touch driving voltage is supplied to the driving electrodes TX. For example, in the pen mode, when the stylus pen 100 depresses the first driving electrode TX1 of the driving electrodes TX1 to TX6, the touch is driven by the first driving electrode TX1. When a voltage is supplied, the pen signal is transmitted to the pen sensing unit 630 through the antenna 510.

The pen sensing unit 630 knows that the touch driving voltage is supplied to the first driving electrode TX1, and when the touch driving voltage is supplied to the first driving electrode TX1, the pen signal is received. Therefore, the pen sensing unit 630 can know that the first driving electrode TX1 has been touched by the stylus pen 100.

In the same manner as in the above process, in the pen mode, the touch driving voltage is sequentially supplied to the receiving electrodes RX1 as well. In this case, when the pen signal is received, the pen sensing unit 630 can know that the receiving electrode to which the touch driving voltage has been supplied has been touched.

Through the above processes, the driving electrode and the receiving electrode touched by the stylus pen 100 are determined, and the touch coordinates may be extracted.

The display device according to the present invention repeatedly performs a finger mode in which the presence or absence of a touch by a finger is determined and a pen mode in which the presence or absence of a touch by the stylus pen 100 is determined.

For example, in the finger mode, the driving unit 610 sequentially supplies the touch driving voltage to the driving electrodes, and the receiving unit 620 uses sensing signals received from the receiving electrodes to The presence or absence of touch and touch coordinates can be determined by.

In the pen mode, the driving unit 610 sequentially supplies the touch driving voltage to the driving electrodes, and the pen sensing unit 630 uses the pen signal to generate a touched driving electrode among the driving electrodes. Judge. In addition, the driving unit 610 sequentially supplies the touch driving voltage to the receiving electrodes, and the pen sensing unit 630 determines a touched receiving electrode among the receiving electrodes by using the pen signal. .

The finger mode and the pen mode may be controlled according to a control signal transmitted from the control unit 400, or may be controlled by a touch control unit (not shown) provided in the touch sensing unit 600. . In particular, in the pen mode, the touch control unit may sequentially connect the driving unit 610 to the driving electrodes, and then connect the driving unit 610 to the receiving electrodes in sequence. By this operation, in the pen mode, the touch driving voltage may be sequentially transmitted to the driving electrodes and the receiving electrodes.

However, in the pen mode, a pen mode driving unit that supplies the touch driving voltage may be separately provided. In this case, the touch control unit may include the pen mode driving unit sequentially to the driving electrodes and the receiving electrodes. By connecting, the touch driving voltage may be sequentially supplied to the driving electrodes and the receiving electrodes.

Second, the AC signal generation unit 100b is connected to an output unit 192 for generating and outputting the AC signal acting as noise, and a first terminal of the output unit 192, and It is exposed on the surface, is formed of a conductive material, is connected to the first finger terminal 194 to which the user's first finger is in contact and the second terminal of the output unit 192, and is exposed to the surface of the case 150 It is formed of a conductive material, and includes a second finger terminal 195 to which the user's second finger is in contact.

The output unit 192 outputs an AC voltage having a specific frequency and voltage as the AC signal.

The first finger terminal 194 and the second finger terminal 195 are mounted in the case 150 to be spaced apart from each other. When the user contacts the first finger and the second finger on the first finger terminal 194 and the second finger terminal 195, the AC signal is transmitted to the first finger terminal 194 and the second finger terminal ( 195) and, through the first and second fingers, it is supplied to the user's hand.

The AC signal may act as noise, as described above.

For example, a user who has touched the touch panel with the stylus pen 100 temporarily stops the touch, and as shown in FIG. 5, the hand holding the stylus pen 100 is moved to the touch panel 500. ), the touch is not detected in the pen mode. However, in the finger mode, it may be recognized that the position A of the touch panel 500 where the user's hand is touched is touched.

In order to prevent this, as described above, the spyler pen 100 according to the present invention transmits the AC signal acting as noise to the first finger terminal 194 and the second finger terminal 195. Through the user's hand. The raw data corresponding to the noise caused by the AC signal has a size and shape different from that of raw data generated when there are general noise and general touch. Accordingly, the receiving unit 620 can easily remove noise caused by the AC signal, and thus, even in the finger mode, the position A where the hand is in contact is not recognized as being touched.

The AC signal generation unit 100b, when the first finger terminal 194 or the second finger terminal 195 is pressed by a finger, the output unit 192, the first finger terminal and the When connected to a second finger terminal, and when the first finger terminal 194 or the second finger terminal 195 is not pressed by a finger, the output unit 192 is connected to the first finger terminal and the A switching unit 193 for separating from the second finger terminal may be further included.

In order for the output unit 192 to output the AC signal, power must be consumed. In this case, in order to drive the output unit 192, a power supply unit (not shown) must be mounted on the stylus pen 100, and unnecessary power consumption of the power supply unit must be prevented. To this end, the switching unit 193 may be provided in the AC signal generating unit 100b.

In this case, the switching unit 193 may be formed of an electrode plate spaced apart from the first finger terminal 194 or the second finger terminal. When the first finger terminal or the second finger terminal is pressed, the first finger terminal or the second finger terminal and the electrode plate are electrically connected, so that the output unit 192 is connected to the first finger terminal and the second finger terminal. The AC signal can be output through a finger terminal. In addition to this, the switching unit 193 may be formed in various shapes.

The AC signal may act as a haptic signal, as described above.

For example, if it is determined that the user needs to feel the vibration or touch, the control unit 400 transmits the haptic information to the stylus pen 100 through the wireless communication unit 410. The stylus pen 100 transmits the AC signal having a specific frequency or voltage to the first finger terminal 194 and the second finger terminal 195, and the first finger and the second finger according to the haptic information. Through the user's hand. In this case, the polarity applied to the first finger terminal 194 and the second finger terminal 195 is continuously changed by the AC signal, as shown in FIG. 6. Therefore, the user can feel the vibration or touch by the AC signal.

To this end, the AC signal generating unit 100b is provided with a pen communication unit 196 for communicating with a wireless communication unit 410 of a display device equipped with the touch panel 500 and the haptic unit 196 from the pen communication unit 196. When information is received, a pen control unit that drives the output unit 192 so that the output unit 192 outputs the AC signal to the first finger terminal 194 and the second finger terminal 195 ( 191).

As described above, the haptic information transmitted through the wireless communication unit 410 is received by the pen communication unit 196 through a wireless communication network. The pen communication unit 196 may receive the haptic information using a wireless communication method used by the wireless communication unit 410, for example, Bluetooth.

The pen control unit 191 may analyze the haptic information to determine a frequency and a magnitude of the AC signal, and control the output unit 192 to output an AC signal having the frequency and magnitude. In this case, the AC signal becomes a haptic signal.

The features of the present invention described above are summarized as follows.

The stylus pen 100 according to the present invention basically transmits the pen signal to the pen sensing unit 630 via wireless.

In particular, the stylus pen 100 outputs an AC signal having an AC voltage.

When the AC signal is applied to the touch panel 500 through the user's hand, pseudorandom noise is generated by the AC signal. The receiving unit 620 removes the pseudorandom noise so that while the stylus pen 100 is used, unnecessary touches are not recognized even in the finger mode.

The pseudorandom noise may be expressed as an unspecified waveform having a constant period or a continuous voltage. The waveform may be a signal having a plurality of voltage levels. The waveform may be a binary digital signal.

The AC signal may be used as a haptic signal. The user can feel the vibration or touch by the haptic signal. For example, when the AC signal having a specific frequency and voltage is supplied to the first finger terminal 194 and the second finger terminal 195, a hand is touched to the first finger terminal and the second finger terminal. The performing user can feel the electric vibration (Electro-Vibration), and the electric vibration can be recognized as a tactile sensation.

The magnitude and frequency of the voltage of the haptic signal generating the electric vibration may vary in various ways according to the haptic information transmitted through the wireless communication unit 410.

Those skilled in the art to which the present invention pertains will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting. The scope of the present invention is indicated by the claims to be described later rather than the detailed description, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: stylus fan 200: gate driver
300: data driver 400: control unit
500: touch panel 600: touch sensing unit
700: panel

Claims (6)

Transmitting and receiving unit for wirelessly transmitting a pen signal when the touch drive voltage is received from the touch panel;
A case covering the transmission/reception unit; And
When the touch driving voltage is received, it includes an AC signal generator for outputting an AC signal to the surface of the case,
The AC signal is a stylus pen that performs at least one of a function of generating noise on the touch panel and a function of a haptic signal that a user can feel. The method of claim 1,
The AC signal generator,
An output unit generating and outputting the AC signal acting as noise;
A first finger terminal connected to the first terminal of the output unit, exposed on the surface of the case, formed of a conductive material, and contacted with a user's first finger; And
A stylus pen including a second finger terminal connected to the second terminal of the output unit, exposed on the surface of the case, formed of a conductive material, and contacted with a second finger of the user. The method of claim 2,
The AC signal generator,
When the first finger terminal or the second finger terminal is pressed by a finger, the output unit is connected to the first finger terminal and the second finger terminal, and the first finger terminal or the second finger terminal is When not pressed by a finger, the stylus pen further comprises a switching unit for separating the output unit from the first finger terminal and the second finger terminal. The method of claim 1,
The AC signal generator,
A pen communication unit for performing communication with a wireless communication unit of a display device including the touch panel;
An output unit generating and outputting the AC signal acting as a haptic signal through which a user can feel the vibration;
A first finger terminal connected to the first terminal of the output unit, exposed on the surface of the case, formed of a conductive material, and contacted with a user's first finger;
A second finger terminal connected to the second terminal of the output unit, exposed on the surface of the case, formed of a conductive material, and contacted with a user's second finger; And
When the haptic information is received from the pen communication unit, the stylus pen further comprises a pen control unit configured to drive the output unit so that the output unit outputs the haptic signal to the first finger terminal and the second finger terminal. A touch panel on which touch electrodes are formed;
A panel on which the touch panel is formed and an image is output;
A stylus pen for wirelessly transmitting a pen signal when a touch driving voltage is received from the touch panel;
An antenna formed on the touch panel; And
A touch sensing unit that determines whether or not there is a touch on the touch panel using the sensing signal received from the touch panel and the pen signal received through the antenna,
The stylus pen outputs an AC signal to the surface of the stylus pen when the touch driving voltage is received,
The AC signal performs at least one of a function of generating noise on the touch panel and a function of a haptic signal that a user can feel. The method of claim 5,
The stylus pen,
A transmission/reception unit for transmitting the pen signal when the touch driving voltage is received;
A case covering the transmission/reception unit; And
A display device comprising an AC signal generator configured to output the AC signal to a surface of the case when the touch driving voltage is received.

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