KR102369162B1 - Mobile device having transmitter for wireless charging of stylus pen - Google Patents

Abstract

The present invention relates to a mobile device, comprising: a touch screen sensing a stylus pen; a pen holder into which the stylus pen is inserted; and a transmitter having a coil that generates a magnetic field. The stylus pen may include: a tip forming a capacitance with an electrode line of the touch screen; an amplifier coupled to the tip; a resonant circuit coupled to the amplifier; a battery coupled to the amplifier; and a receiver connected to the battery and having a coil generating electricity according to a magnetic field from the transmitter. The signal amplified by the amplifier and the power charged in the battery are supplied to the resonance circuit.

Description

Mobile device having a transmitter for wireless charging of a stylus pen

The present invention relates to a mobile device capable of charging a stylus pen.

A user interface (UI) enables communication between a person (user) and various electronic devices, so that the user can easily control the electronic device as he or she wants. Representative examples of the user interface include a keypad, a keyboard, a mouse, an on-screen display (OSD), and a remote controller having an infrared communication or radio frequency (RF) communication function. User interface technology is developing in the direction of increasing user sensitivity and ease of operation. Recently, the user interface is evolving into a touch UI, a voice recognition UI, a 3D UI, and the like.

The touch UI tends to be essential for portable information devices, and furthermore, it is being applied to home appliances. The touch UI generates location information by detecting the location of a finger or pen touched on a touch screen.

The touch screen is divided into a touch screen that senses a conductor such as a finger, and a touch screen that senses a stylus pen. There are some types of stylus pens that require a battery depending on how they are combined with the touch screen. For example, the N-Trig pen operates normally only when a battery is present because a signal must be supplied to the touch screen through capacitance.

Wired/wireless chargers for charging the stylus pen are commercially available. A user must carry a charger for charging the stylus pen separately from a mobile device equipped with a touch screen. The stylus pen charger is not only inconvenient to carry, but also imposes a price burden on users. There is a need for a method in which a user can charge the stylus pen without carrying a charger for the stylus pen.

The present invention provides a mobile device capable of charging a stylus pen.

The mobile device of the present invention includes a touch screen for sensing a stylus pen; a pen holder into which the stylus pen is inserted; and a transmitter having a coil that generates a magnetic field. ,
The stylus pen may include: a tip forming a capacitance with an electrode line of the touch screen; an amplifier coupled to the tip; a resonant circuit coupled to the amplifier; and a battery coupled to the amplifier; and a receiver connected to the battery and having a coil generating electricity according to a magnetic field from the transmitter. The signal amplified by the amplifier and the power charged in the battery are supplied to the resonance circuit.

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According to the present invention, the stylus pen can be charged by simply inserting the stylus pen into the pen holder of the mobile device without a separate charger by installing a transmitter for charging the stylus pen near the pen holder of the mobile device and installing the receiver on the stylus pen. can As a result, the present invention can eliminate the burden of the user's purchase cost of the charger and simplify the carrying of the mobile device and the stylus pen.

1 is a diagram schematically showing a touch screen and a stylus pen according to an embodiment of the present invention.
2 and 3 are views showing the structure of the stylus pen shown in FIG. 1 .
4 is a view illustrating an example in which a stylus pen is inserted into a holder of a mobile device.
5 is a block diagram showing a circuit configuration for wireless charging of a stylus pen.
6 and 7 are views illustrating the arrangement of a transmitter and a receiver for wireless charging of a stylus pen.
8 is a flowchart illustrating a method of selectively charging a battery based on a detection result of a battery charge amount.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals refer to substantially identical elements throughout. In the following description, if it is determined that a detailed description of a known function or configuration related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Referring to FIG. 1 , in the touch screen 20 of the present invention, X lines and Y lines cross each other. The touch screen 20 may further include an antenna for receiving a resonance signal from the stylus pen 10 .

When the stylus pen 10 approaches or comes into contact with the touch screen 20 , a resonance signal from the stylus pen 10 is received by the X lines and the Y lines through the capacitance Csx. A touch sensing circuit connected to the touch screen 20 senses the stylus pen 10 based on a signal received from the pen 10 . The touch sensing circuit may calculate the position and touch pressure of the stylus pen 10 using a known algorithm.

The mobile device includes a touch screen 20 for interface with the user. The touch screen 20 may be combined with a display device of a mobile device in various forms. A mobile device is a portable information device, and includes, but is not limited to, a notebook computer, a smart phone, a tablet computer, and the like.

The stylus pen 10 has the same structure as in FIGS. 2 and 3 . The stylus pen 10 includes a wireless charging receiver (Rx, hereinafter referred to as a “receiver”) 11 , an amplifier (AMP, 12 ), a resonance circuit 13 , and a battery 14 . A tip 15 is formed at one end of the stylus pen 10 to come into contact with the touch screen 20 . A switch (not shown) may be installed between the tip 15 and the amplifier 12 . This switch may be turned on/off when the tip 15 advances and retreats to switch the current path between the tip 15 and the amplifier 12 .

The amplifier 12 is connected to the resonance circuit 13 and the battery 14 to amplify a signal received through the capacitance Csx and supply it to the resonance circuit 13 and the battery 14 . The resonance circuit 13 is constituted by an LC parallel resonance circuit to generate a resonance signal according to the signal from the amplifier 12 . The resonance signal may be transmitted to the touch screen 20 and used to read the position of the stylus pen 10 and measure the pen pressure.

The receiver 11 is paired with a wireless charging transmitter (Tx, hereinafter referred to as a "transmitter") built into the mobile device. The receiver 11 generates electricity induced by a magnetic field received by the transmitter and a magnetic induction or magnetic resonance method, and transmits the electricity to the battery 14 .

The battery 14 charges the current from the receiver 11 and supplies the current to the resonance circuit 13 to increase the strength of the resonance signal. On the other hand, a resonance signal can be generated by supplying the signal amplified by the amplifier 12 to the resonance circuit 13, and when supplying stable power from the battery 14 to the resonance circuit 13, hovering, sensing sensitivity, A better effect can be obtained from the sense of touch.

According to the present invention, when the stylus pen 10 is inserted into the pen holder 31 of the mobile device 30 , the stylus pen 10 is charged without a separate operation by the user. The pen holder 31 is implemented in the form of an insertion hole penetrating the exterior housing of the mobile device. Accordingly, since the user can charge the stylus pen 10 simply by inserting the stylus pen 10 into the pen holder 31 of the mobile device 30, the stylus pen 10 can be charged without a separate charger. there is.

As shown in FIG. 5 for wireless charging of the stylus pen 10 , the mobile device 30 includes a transmitter 54 , first sensors SS1 and 52 , and second sensors SS2 and 53 , and a charging control unit CONT , 51).

The transmitter 54 , the first sensor 52 , and the second sensor 53 are installed near the pen holder 31 . The transmitter 54 generates a magnetic field through the coil under the control of the charging control unit 51 .

The first sensor 52 detects whether the stylus pen 10 is in the pen holder 31 . The second sensor 53 detects the charge amount of the battery 14 of the stylus pen 10 . The second sensor 53 may measure the current of the battery 14 through a terminal formed in the external housing of the stylus pen 10 to detect the amount of charge.

The charging control unit 51 receives sensor signals from the first and second sensors 52 and 53 to control the operation timing of the transmitter 54 . For example, the charging control unit 51 may drive the transmitter 31 only when the stylus pen 10 is inserted into the pen holder 31 in order to reduce power consumption. In this case, when the stylus pen 10 is withdrawn from the mobile device 30 , the transmitter 31 is not driven. As another embodiment, the charging control unit 51 may drive the transmitter 31 only when the stylus pen 10 is inserted in the pen holder 31 and the charge amount of the battery 14 is less than a preset threshold value.

According to the present invention, the stylus pen 10 can be automatically charged in the pen holder 31 without the need to detect the stylus pen 10 . In this case, the first and second sensors 52 and 53 may be omitted. When the stylus pen 10 is charged only when the stylus pen 10 is inserted into the pen holder 31 , the second sensor 53 may be omitted.

The transmitter 54 of the mobile device 30 and the receiver 14 of the stylus pen 10 are disposed close to each other with the structure of the pen holder 31 interposed therebetween in order to increase wireless charging efficiency. The positions of the transmitter 54 and the receiver 14 are not limited to specific positions. For example, the transmitter 54 and the receiver 14 may face each other with the tip 15 of the stylus pen 10 therebetween as shown in FIG. can

8 shows an example of a stylus pen charging method according to an embodiment of the present invention.

Referring to FIG. 8 , the mobile device 30 detects whether the stylus pen 10 is in the pen holder 31 ( S1 ). When the stylus pen 10 is inserted into the pen holder 31 , the mobile device 30 detects the charge amount V(BAT) of the battery 14 ( S2 and S3 ).

When the charge amount V(BAT) of the battery 14 is lower than the preset threshold TH, the mobile device 30 drives the transmitter 54 to charge the battery 14 . On the other hand, when the charge amount V(BAT) of the battery 140 is equal to or greater than the threshold value TH, the mobile device 30 stops the operation of the transmitter 54 to not additionally charge the battery 14 .

Those skilled in the art from the above description will be able to see that various changes and modifications are possible without departing from the technical spirit of the present invention. Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10: stylus pen 11: wireless charging receiver
12 amplifier 13 resonant circuit
14: battery 20: touch screen
30: mobile device 31: pen holder
51: charging control unit 52: first sensor
53: second sensor 54: transmitter for wireless charging

Claims (5)

a touch screen that detects a stylus;
a pen holder into which the stylus pen is inserted; and
a transmitter having a coil generating a magnetic field;
The stylus pen,
a tip forming a capacitance with an electrode line of the touch screen;
an amplifier coupled to the tip;
a resonant circuit coupled to the amplifier;
a battery coupled to the amplifier; and
A receiver connected to the battery and having a coil generating electricity according to a magnetic field from the transmitter,
The signal amplified by the amplifier and the power charged in the battery are supplied to the resonance circuit. The method of claim 1,
a sensor for detecting the stylus pen inserted into the pen holder; and
and a charging control unit configured to drive the transmitter only when the stylus pen is inserted into the pen holder in response to an output signal of the sensor. The method of claim 1,
a first sensor sensing the stylus pen inserted into the pen holder;
a second sensor for detecting the amount of charge of the battery; and
The transmitter compares the charge amount of the battery with a preset threshold value when the stylus pen is inserted into the pen holder in response to the output signals of the first and second sensors, and only when the charge amount of the battery is less than the threshold value Mobile device further comprising a charging control unit for driving. The method of claim 1,
The stylus pen,
Further comprising a switch element connected between the tip and the amplifier,
wherein the switch element switches a current path between the tip and the amplifier when the tip advances and retreats. The method of claim 1,
and a touch sensing circuit configured to read a position of the stylus pen and measure a pen pressure based on a resonance signal received from the resonance circuit of the stylus pen to the touch screen.

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