TWI748378B - Active stylus - Google Patents

Abstract

An active stylus includes a stylus body and a touch sensor. The stylus body includes a first electrode and a pen body. The first electrode is used to send a signal. The pen body extends along a first direction. The touch sensor is on the pen body and includes a plurality of column electrodes extended along the first direction. There is a first gap between two adjacent column electrodes. Each column electrode has a first sensing electrode and a second sensing electrode. A first end of the first sensing electrode in the first direction has a notch to form an indentation part. A second end of the second sensing electrode in the first direction has a protrusive part extended into the indentation part. There is a second gap between the protrusive part and the notch. The second gap is less than the first gap.

Description

Active stylus

The present invention relates to an active stylus, in particular to an active stylus with a touch area.

Touch electronic devices that use a touch panel as a human-machine interface are quite common. Users can use a stylus to write or draw on the touch panel to input text or patterns. Stylus can be divided into active stylus and passive stylus. The active stylus can be configured with many different components. In addition to writing, the active stylus has more and more functions.

One of the objectives of the present invention is to provide an active stylus with a touch area.

According to the present invention, an active stylus includes a stylus body and a touch sensor. The stylus body includes a first electrode for emitting a signal and a brush body extending along a first direction. The touch sensor is arranged on the pen body, and the touch sensor includes a plurality of rows of electrodes extending along the first direction, and there is a first gap between two adjacent rows of electrodes, and each row of electrodes includes a first sensor. The first end of the first sensing electrode along the first direction has a gap to form a recessed area, and the second sensing electrode is along the second direction of the first direction. The end has a protruding portion, the protruding portion extends to the recessed area, a second gap is formed between the protruding portion and the notch, and the second gap is smaller than the first gap.

Since the protruding portion of the second sensing electrode extends to the recessed area of the first sensing electrode to form a stagger, the contact of the finger on the protruding portion will also touch the second sensing electrode , Which helps to more accurately detect the contact position of the finger.

FIG. 1 shows the active stylus 10 of the present invention, which includes a stylus body 11 and a touch sensor 12. The stylus body 11 includes a pen head 111 and a pen body 112. The pen head 111 has a first electrode 1111 for emitting signals. The pen body 112 extends along the first direction X and has a touch area 1121. The touch sensor 12 is arranged on the touch area 1121 of the pen body 112 and surrounds the pen body 112 in a circle or a part, or is arranged inside the pen body 112. The length L of the touch sensor 12 may be but not limited to 28.4 mm, and the width W of the touch sensor 12 may be but not limited to 21.8 mm. The touch sensor 12 includes a plurality of rows of electrodes CE1, CE2, CE3, CE4, and CE5 extending along the first direction X. There is a first gap a between two adjacent rows of electrodes. The first gap a can be but is not limited to 2~2.5mm. In an embodiment, the first gap a is 2 mm. The row electrodes CE1, CE2, CE3, CE4, and CE5 in FIG. 1 have the same structure, so only the row electrode CE1 is used as an example for description. The row electrode CE1 includes a plurality of sensing electrodes SE11, SE12, SE13, and SE14. The first ends 122, 124, and 126 of the sensing electrodes SE12, SE13, and SE14 in the first direction X have notches to form recessed areas, and the sensing electrodes The second ends 121, 123, and 125 of SE11, SE12, and SE13 in the first direction X have protrusions extending to the recessed regions of adjacent sensing electrodes SE12, SE13, and SE14, in other words, adjacent ones of the same row The two sensing electrodes are interleaved. There is a second gap b between the protrusions of the sensing electrodes SE11, SE12, and SE13 and the notches of the adjacent sensing electrodes SE12, SE13, and SE14, respectively, the second gap b is smaller than the first gap a, and the second gap b It can be but not limited to 0.3~0.61mm. The width c of the sensing electrodes SE11, SE12, SE13, and SE14 may be, but not limited to, 2.5-3 mm. In one embodiment, the width c is 2.76 mm. In the embodiment of FIG. 1, each row of electrodes CE1, CE2, CE3, CE4, and CE5 each includes 4 sensing electrodes, but in another embodiment, each row of electrodes CE1, CE2, CE3, CE4, and CE5 can also have only Two sensing electrodes are not limited to this.

The block diagram of FIG. 2 provides an embodiment of the present invention to illustrate other components of the active stylus 10. The active stylus 10 further includes a control circuit 13 connected to the touch sensor 12, a wireless transmission circuit 14 and a first electrode 1111. The control circuit 13 generates a corresponding first signal Sc via operation on the touch sensor 12 The wireless transmission circuit 14 or the first electrode 1111 is sent to the touch screen 20. In detail, the control circuit 13 is provided in the pen body 112 through a plurality of wires (not shown in the figure) respectively connected to the plurality of sensing electrodes SE11~SE54 of the touch sensor 12, and the control circuit 13 obtains each sensing electrode. The sensing amount of the electrodes SE11 to SE54 is used to calculate the contact position or determine the operation of the user's finger on the touch sensor 12, such as clicking or sliding. The sensing electrodes SE11 to SE54 in FIG. 1 are electrically connected to the controller 13 respectively. The control circuit 13 detects the touch sensor 12. The controller 13 calculates the contact position according to the change in the sensing amount of each sensing electrode SE11 to SE54 of the touch sensor 12. Or, based on detecting the user's operation on the touch sensor 12 (for example, the movement of the user's finger in the first direction X), the controller 13 generates the corresponding first signal Sc. The first signal Sc can be a command or information related to the operation of the user on the touch sensor 12. The first signal Sc generated by the control circuit 13 can be sent to the touch screen 20 outside the active stylus 10 through the wireless transmission circuit 14 or the first electrode 1111, and the touch screen 20 will be based on the received first signal Sc Perform a corresponding operation, such as changing the color or thickness of the line generated on the touch screen 20 in response to the operation of the active stylus 10. In an embodiment, the wireless transmission circuit 14 may be a Bluetooth.

In the touch sensor 12 in FIG. 1, the adjacent sensing electrodes in the same row are staggered, which helps to improve the accuracy of the controller 13 in calculating the contact position. Fig. 3 shows the configuration of sensing electrodes SE11, SE12, SE13, and SE14 according to the present invention. The following will describe the case where the finger touches the three positions P1, P2, P3 arranged along the first direction X on the sensing electrode SE12. When the finger is at the position P1, the finger will touch the sensing electrodes SE11 and SE12 at the same time. According to the sensing amount of the sensing electrodes SE11 and SE12, the control circuit 13 can determine the left side of the finger sensing electrode SE12. When the finger moves from the position P1 to the position P2, the finger only touches the sensing electrode SE12, so the sensing amount of the sensing electrode SE11 is zero. The control circuit 13 can determine that the finger is now only touching the sensing electrode SE12, and the contact position is at P2. The control circuit 13 can determine that the finger moves to the right in the first direction X according to the detected position. When the finger moves from the position P2 to the position P3, the finger will touch the sensing electrodes SE12 and SE13 at the same time. According to the sensing amount of the sensing electrodes SE12 and SE13, the control circuit 13 can determine that the contact position of the finger is at the sensing electrode S12 Is on the right side of P3. If the sensing electrodes are not interlaced, as shown in the sensing electrodes SE11', SE12', SE13', and SE14' in Figure 3, then the finger will only touch the sensing electrode SE12' regardless of the positions P1, P2, and P3. Therefore, the control circuit 13 can only detect the change in the sensing amount of the sensing electrode SE12', and cannot further determine whether the finger is on the right, middle, or left of the sensing electrode SE12'. Moreover, when the finger moves from the position P1 to the position P2 or from the position P2 to the position P3, the sensing amount detected by the control circuit 13 is the same, so the control circuit 13 will determine that the finger has not moved. In other words, according to the pattern of the touch sensor 12 provided by the present invention, the accuracy of touch detection is relatively high. Although it is also possible to improve the accuracy of touch detection by reducing the length of the sensing electrodes SE11', SE12', SE13', and SE14', in this way, the number of sensing electrodes will inevitably increase under the same area. Lead to rising costs.

According to the present invention, since the operation of the finger on the touch sensor 12 usually moves along the X direction, the sensing electrodes of two adjacent rows do not need to be too close. The present invention makes the first gap a larger than the second The gap b does not affect the user's operation, and can reduce the number of rows of sensing electrodes, which helps reduce costs, and reduces the number of pins required for the control circuit 13 to connect to each sensing electrode of the touch sensor 12 .

The above description of the preferred embodiments of the present invention is for the purpose of clarification, and is not intended to limit the present invention to the disclosed form accurately. Modifications or changes are possible based on the above teaching or learning from the embodiments of the present invention Yes, the embodiments are selected and described in order to explain the principles of the present invention and allow those familiar with the technology to use the present invention in various embodiments in practical applications. The technical ideas of the present invention are intended to be derived from the scope of subsequent patent applications and their equality. Decide.

10: Active stylus 11: stylus body 111: pen 1111: first electrode 112: Pen body 1121: Touch area 12: Touch sensor 121: The second end of the sensing electrode SE11 122: The first end of the sensing electrode SE12 123: The second end of the sensing electrode SE12 124: The first end of the sensing electrode SE13 125: The second end of the sensing electrode SE13 126: The first end of the sensing electrode SE14 13: Control circuit 14: Wireless transmission circuit

Figure 1 shows the active stylus of the present invention. Figure 2 shows the circuit of the active stylus of the present invention. Figure 3 is used to illustrate the presence or absence of interleaving between the sensing electrodes.

10: Active stylus

11: stylus body

111: pen

1111: first electrode

112: Pen body

1121: Touch area

12: Touch sensor

121: The second end of the sensing electrode SE11

122: The first end of the sensing electrode SE12

123: The second end of the sensing electrode SE12

124: The first end of the sensing electrode SE13

125: The second end of the sensing electrode SE13

126: The first end of the sensing electrode SE14

Claims (8)

An active stylus, including: A stylus body, including a first electrode and a brush body, the first electrode is used to emit a signal, and the pen body extends along a first direction; and A touch sensor is arranged on the pen body, the touch sensor includes a plurality of rows of electrodes extending along the first direction, a first gap is formed between two adjacent rows of electrodes, and each row of electrodes includes: A first sensing electrode, the first end of which along the first direction has a notch to form a recessed area; and A second sensing electrode, the second end of which along the first direction has a protruding portion, the protruding portion extends to the recessed area, a second gap is formed between the protruding portion and the notch, the The second gap is smaller than the first gap. For example, the active stylus of claim 1, wherein the second gap is 0.3~0.61mm. Such as the active stylus of claim 1, wherein the width of the first sensing electrode and the second sensing electrode is 2.5-3 mm. For example, the active stylus of claim 1, wherein the first gap is 2~2.5mm. For example, the active stylus of claim 1, further including: A control circuit is respectively connected to the first sensing electrode and the second sensing electrode of each row electrode to generate a corresponding first signal according to the operation of the object on the touch sensor. For example, the active stylus of claim 5 further includes a wireless transmission circuit connected to the control circuit for sending the first signal to the outside of the active stylus. Such as the active stylus of claim 5, wherein the control circuit is connected to the first electrode, and transmits the first signal to the outside of the active stylus via the first electrode. For example, the active stylus of claim 1, wherein the length and width of the touch sensor are 28.4 mm and 21.8 mm, respectively.

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