TWI687861B - Active stylus and the touch display system using the same - Google Patents

Abstract

An active stylus includes a touch end and a body connected to the touch end, and the active stylus includes a first emitting electrode, a second emitting electrode, at least one sensing electrode, and a first control unit. The first emitting electrode is disposed on a surface of the body. The second emitting electrode is disposed on the touch end. The first emitting electrode and the second emitting electrode are operated alternatively. The sensing electrode is disposed on the surface of the body and has a capacitance value. The first control unit is coupled to the first emitting electrode, the second emitting electrode, and the sensing electrode, respectively. The first control unit sets one of the first emitting electrode and the second emitting electrode to be enabled and sets the other one to be floated simultaneously according to change of the capacitance value.

Description

Active pen and touch display system using the active pen

The invention relates to a touch device; specifically, the invention relates to an active pen and a touch display system.

Active pens have been widely used in conjunction with touch-enabled display devices to provide input effects; they can be divided into two categories depending on the mode of operation. One is the movement of the glass surface attached to the display device to produce writing, or 2D Touch control; the other is to generate handwriting at a distance from the glass surface of the display device, or called 3D touch.

However, when the user wants to perform the above-mentioned two different operations, he needs to purchase two different active pens separately, which is inconvenient in use and does not meet economic considerations.

Although the existing technology proposes active pens combining different operation modes, however, since the operation mode is to switch the operation mode according to the judgment of the force of holding the pen, each person's force of holding the pen is different, which causes the display device to perform the operation mode The judgment of switching is prone to misjudgment, which needs to be further improved.

An object of the present invention is to provide an active pen and touch display system that can integrate different operation methods.

The active pen includes a contact end and a body connected to the contact end, and includes a first emitting electrode, a second emitting electrode, at least one sensing electrode, and a first control unit. The first emitter electrode is provided on the surface of the body. The second emitter electrode is disposed at the contact end and operates alternately with the first emitter electrode. The sensing electrode is arranged on the surface of the body and has a capacitance value. The first control unit is respectively coupled to the first emitting electrode, the second emitting electrode and the sensing electrode. The first control unit sets one of the first emitter electrode and the second emitter electrode to an enabled state according to the change in capacitance value, and at the same time sets the other emitter electrode of the first emitter electrode and the second emitter electrode to be floating status.

A touch display system includes an active pen and a touch display module. The touch display module includes a display panel and a touch panel provided on the display panel. The touch panel includes a first operation electrode, a second operation electrode, and a second control unit. The second control unit is coupled to the first operation electrode and the second operation electrode. When the first emitting electrode is in the enabled state, the second control unit determines the position of the active pen according to the electric field state of the first operating electrode; when the second emitting electrode is in the enabled state, the second control unit is based on the second operating electrode and the second The change in capacitance between the emitter electrodes determines the position of the active pen. Thereby, the active pen can be switched between different operation modes.

It should be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “connected to” another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range for a particular value determined by one of ordinary skill in the art, taking into account the measurements and A certain amount of measurement-related errors (ie, measurement system limitations). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%.

FIG. 1 is a schematic diagram of an embodiment of an active pen 10 of the present invention. As shown in FIG. 1, the active pen 10 includes a contact end 12 and a body 14 connected to the contact end 12, and includes a first emitting electrode 110, a second emitting electrode 120, a sensing electrode 130, and a first control unit. The first emitter electrode 110 is provided on the surface of the body 14 and the second emitter electrode 120 is provided on the contact end 12. The first emitting electrode 110 and the second emitting electrode 120 operate alternately. The sensing electrode 130 is disposed on the surface of the body 14 and can detect capacitance changes, for example, it can surround the body 14 in a ring shape.

The first control unit is provided inside the active pen 10, for example, a space inside the body 14. Please also refer to Figure 2. FIG. 2 is a block diagram of the active pen 10. As shown in FIG. 2, the first control unit 140 is respectively coupled to the first emitting electrode 110, the second emitting electrode 120 and the sensing electrode 130. The first control unit 140 is, for example, a microcontroller, which sets one of the first emitting electrode 110 and the second emitting electrode 120 to an enabled state according to the change in the capacitance value of the sensing electrode 130, and simultaneously sets the other One emitter electrode is set to a floating state.

As shown in FIG. 2, when the first emission electrode 110 is set to the enabled state, the active pen 10 enters the first operation mode and the first emission electrode 110 generates the first signal S1 for the first operation mode. When the second emission electrode 120 is set to the enabled state, the active pen 10 enters the second operation mode and the second emission electrode 120 generates the second signal S2 for the second operation mode.

For example, the first operation mode is floating operation, and the position of the active pen 10 can be calculated by sensing the signal generated by the first emitting electrode 110 through the touch panel; the second operation mode is contact operation, through the touch in the touch panel The change of the capacitance value measured by the control sensing electrode can calculate the position where the active pen 10 contacts.

Preferably, the frequency band of the first signal S1 and the frequency band of the second signal S2 do not overlap, thereby avoiding interference with each other when receiving signals.

Returning to FIG. 1, taking the active pen 10 of FIG. 1 as an example, the surface of the body 14 has a first grip portion 141 and a second grip portion 142. The first emitter electrode 110 and the sensing electrode 130 are disposed on the second grip portion 142; in other words, the first grip portion 141 can be regarded as a partial section where the first emitter electrode 110 or the sensing electrode 130 are not provided on the body 14.

In the example shown in FIG. 1, the second grip portion 142 is closer to the contact end 12 than the first grip portion 141. With this design, when the first operation mode is performed by the first emission electrode 110, the first emission electrode 110 can be closer to the display device, and the required operating energy is lower.

However, it should be noted that the positional relationship between the first grip portion 141 and the second grip portion 142 is not limited to the above manner. In other embodiments, the first grip portion 141 may be located at the contact end 12 and the second grip portion 142 between.

It should be added that the first grip portion 141 is made of a non-good conductor or an insulator, and the second grip portion 142 is not a good conductor except the first emitter electrode 110 and the sensing electrode 130 are made of a conductive material Or the material of the insulator.

In addition, it should be added that, because the signal frequency bands provided by the first transmitting electrode 110 and the second transmitting electrode 120 are different, the first transmitting electrode 110 and the second transmitting electrode 120 may be slightly away from each other. For example, as shown in FIG. 1, the side of the first emitter electrode 110 close to the second emitter electrode 120 has an edge 112, and a distance d is left between the edge 112 and the second emitter electrode 120. In one embodiment, the aforementioned distance d is greater than 2 cm.

FIG. 3A is a schematic diagram of the active pen 10 in the first operation mode. As shown in FIG. 3A, the active pen 10 enters the first operation mode and moves across the space above the touch display module 20. Referring to FIGS. 1 and 3A, at this time, the first grip portion 141 is touched, but the sensing electrode 130 is not touched, the first emitting electrode 110 is set to an enabled state, and the second emitting electrode 120 is set It is floating.

FIG. 3B is a schematic diagram of the active pen 10 in the second operation mode. As shown in FIG. 3B, the active pen 10 enters the second operation mode and moves on the surface of the touch display module 20. Referring to FIGS. 1 and 3B, at this time, the second grip portion 142 is touched, and the sensing electrode 130 is touched, the first emitting electrode 110 is set to a floating state, and the second emitting electrode 120 is set to Enabling status.

In one embodiment, the sensing electrode 130 forms a self-capacitive sensing. When the sensing electrode 130 is touched, the capacitance value rises accordingly. At this time, the first control unit controls the active pen 10 to enter the second operation according to the rise of the capacitance value. mode. In short, when the sensing electrode 130 is touched, the first control unit sets the active pen 10 to enter the second operation mode.

FIG. 4A is a schematic diagram illustrating the change of the capacitance value sensed by self-capacitance in the second operation mode. As shown in FIG. 4A, where the horizontal axis is time and the vertical axis is capacitance value, the symbol CS represents the capacitance value sensed by self-capacitance.

When the sensing electrode 130 is touched, the capacitance value of the sensing electrode 130 increases. For example, when the capacitance value of the sensing electrode 130 exceeds a preset threshold TH1, the first control unit sets the active pen 10 to enter the second operation mode.

Conversely, when the sensing electrode 130 is not touched, the capacitance value of the sensing electrode 130 does not change substantially, or falls below the preset threshold TH1 from exceeding the preset threshold TH1, the first control unit sets the active pen 10 to maintain or Enter the first operating mode.

In this way, the first control unit can be used to determine the state of the body surface being touched according to the change in the capacitance value of the sensing electrode 130 to generate a setting result for operating in the first operation mode or the second operation mode.

In another embodiment, the sensing electrode can adopt mutual capacitance sensing. Taking FIG. 3B as an example, the sensing electrode is a first receiving electrode 130R, and the first receiving electrode 130R and the first transmitting electrode 110 form a mutual capacitive sensing. When the first receiving electrode 130R and the first transmitting electrode 110 on the second grip portion are touched, the capacitance value drops accordingly and the active pen 10 enters the second operation mode. In short, when the first receiving electrode 130R and the first transmitting electrode 110 are touched, the first control unit sets the active pen 10 to enter the second operation mode.

FIG. 4B is a schematic diagram illustrating the change in capacitance value sensed by mutual capacitance in the second operation mode. As shown in FIG. 4B, where the horizontal axis is time and the vertical axis is the capacitance value, the symbol CM represents the capacitance value sensed by mutual capacitance.

When the first receiving electrode 130R and the first transmitting electrode 110 are touched, the capacitance value of the sensing electrode decreases. For example, when the capacitance value of the sensing electrode exceeds a preset threshold TH2, the first control unit sets the active pen 10 to enter the second operation mode.

Conversely, when the first receiving electrode 130R and the first transmitting electrode 110 are not touched, the capacitance value of the sensing electrode does not change substantially, or falls below the preset threshold TH2 from exceeding the preset threshold TH2, then the first control The unit sets the active pen 10 to enter the first operation mode.

FIG. 5 is a schematic diagram of another embodiment of the active pen 10. As shown in FIG. 5, the active pen 10 may include multiple sensing electrodes 130. Each sensing electrode 130 forms self-capacitive sensing. When one of the sensing electrodes 130 is touched, the first control unit detects that the capacitance value increases and the active pen 10 enters the second operation mode. In other words, by providing a plurality of sensing electrodes 130, the situation that the second operation mode is actually performed without detecting that the sensing electrode 130 is touched can be avoided, and the judgment accuracy of the first control unit during self-capacitance sensing can be improved .

In other embodiments, the range of the sensing electrode 130 on the body can also be extended (for example, a larger sensing electrode covers the range occupied by the three sensing electrodes in FIG. 5) to ensure that the sensing electrode 130 is touched Can be detected and improve the accuracy of the judgment of the first control unit.

6A and 6B are schematic diagrams of different embodiments in which the active pen 10 includes multiple sensing electrodes 130. In FIGS. 6A and 6B, mutual capacitance sensing is used.

As shown in FIG. 6A, the active pen 10 may include a plurality of sensing electrodes 130, wherein the sensing electrode 130 includes a first receiving electrode 130R and a third transmitting electrode 130T. The first receiving electrode 130R and the third transmitting electrode 130T form a mutual capacitance sensing. When the first receiving electrode 130R and the third transmitting electrode 130T are touched, the capacitance value drops and the active pen 10 enters the second operation mode. In other words, when the first receiving electrode 130R and the third transmitting electrode 130T are touched, the first control unit sets the active pen 10 to enter the second operation mode.

In another embodiment, the range of the first receiving electrode 130R and the third transmitting electrode 130T on the body can be extended to improve the accuracy of the judgment of the first control unit.

As shown in FIG. 6B, the sensing electrode 130 includes two first receiving electrodes (130R1, 130R2) and one third transmitting electrode 130T. The first receiving electrodes (130R1, 130R2) and the third transmitting electrode 130T form a mutual capacitance sensing. When one of the two first receiving electrodes (130R1, 130R2) is touched and the third transmitting electrode 130T is touched, the capacitance value drops and the active pen 10 enters the second operation mode. In other words, by providing a plurality of first receiving electrodes, the judgment accuracy of the first control unit during mutual capacitance sensing can be improved.

In other embodiments, the number of the third emitting electrode 130T may also be increased to improve the judgment accuracy of the first control unit.

In addition, using mutual capacitance sensing as shown in FIG. 6A or FIG. 6B, the first transmitting electrode 110 is only used for the first operation mode. It should be understood that the frequency of the signal generated by the first transmitting electrode 110 is set to be the same as the first receiving The electrodes (130R1, 130R2) receive different frequencies.

FIG. 7 is a schematic diagram of an embodiment of the touch display system 1. As shown in FIG. 7, the touch display system 1 includes an active pen 10 and a touch display module 20. Please refer to FIG. 8 together. The touch display module 20 includes a display panel 220 and a touch panel 210 disposed on the display panel 220.

As shown in FIGS. 7 and 8, the touch panel 210 includes a first operation electrode 230, a second operation electrode 240 and a second control unit 250. The second control unit 250 is coupled to the first operating electrode 230 and the second operating electrode 240. The second control unit 250 is, for example, a touch-integrated chip, and can detect changes in the first operation electrode 230 and the second operation electrode 240 to determine the position of the active pen 10. For example, the first operating electrode 230 is used to generate an electric field with the first emitting electrode 110, and the second control unit 250 senses the electric field change; the second operating electrode 240 forms a sensing line in the touch panel 210, which is used for active When the pen 10 contacts the touch panel 210, a capacitance is generated with the second emitter electrode 120, and the capacitance change is sensed by the second control unit 250.

In other words, when the first emitting electrode 110 of the active pen 10 is in the enabled state, the second control unit 250 determines the position of the active pen 10 according to the electric field state of the first operating electrode 230, and when the second emitting electrode 120 is in the enabled state, The second control unit 250 determines the position of the active pen 10 according to the change in capacitance between the second operation electrode 240 and the second emission electrode 120.

8 and 9 are schematic diagrams of different embodiments of the touch display module 20 determining the position of the active pen 10 in the first operation mode of the active pen 10.

As shown in FIG. 8, the first operation electrode 230 includes a transmission electrode 230T and a reception electrode 230R. When the transmitting electrode 230T and the receiving electrode 230R establish an electric field (for example, the touch display module 20 is in operation), when the active pen 10 approaches the touch display module 20, the second control unit 250 detects the amount of change in the electric field generated on the receiving electrode 230R Therefore, the second control unit 250 determines the position of the active pen 10 according to the electric field change amount.

As shown in FIG. 9, the first operation electrode 230 includes a transmission electrode 230T and a reception electrode 230R. When the transmitting electrode 230T is in a floating state (for example, the touch display module 20 enters the sleep mode), the transmitting electrode 230T and the receiving electrode 230R do not establish an electric field. When the active pen 10 approaches the touch display module 20, the second control unit 250 detects that the receiving electrode 230R changes from the state of no applied electric field to the state of applied electric field, so the second control unit 250 determines the position of the active pen 10 according to the applied electric field state.

With the design of FIGS. 8 and 9, the touch display module 20 can determine the position of the active pen in different working states.

The present invention has been described by the above-mentioned related embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, the spirit and scope of modifications and equal settings included in the scope of the patent application are all included in the scope of the present invention.

1: Touch display system 10: Active pen 12: contact end 14: Ontology 20: Touch display module 110: first emitter electrode 112: Edge 120: second emitter electrode 130: induction electrode 130R, 130R1: the first receiving electrode 130R2: the first receiving electrode 130T: third emitter electrode 140: the first control unit 141: The first grip 142: Second grip 210: touch panel 220: display panel 230: first operating electrode 230R: receiving electrode 230T: transmitting electrode 240: second operating electrode 250: second control unit S1: the first signal S2: Second signal d: distance

FIG. 1 is a schematic diagram of an embodiment of the active pen of the present invention.

Figure 2 is a block diagram of an active pen.

FIG. 3A is a schematic diagram of the active pen in the first operation mode.

FIG. 3B is a schematic diagram of the active pen in the second operation mode.

4A and 4B are schematic diagrams of different sensing embodiments of the second operation mode.

5 is a schematic diagram of another embodiment of an active pen.

6A and 6B are schematic diagrams of different embodiments of active pens using mutual capacitance sensing.

7 is a schematic diagram of an embodiment of a touch display system.

8 and 9 are schematic diagrams of different embodiments of the touch display module determining the position of the active pen.

10: Active pen

12: contact end

14: Ontology

110: first emitter electrode

112: Edge

120: second emitter electrode

130: induction electrode

141: The first grip

142: Second grip

d: distance

Claims (10)

An active pen includes a contact end and a body connected to the contact end. The active pen includes: a first emitting electrode provided on the surface of the body; a second emitting electrode provided on the contact end and emitting with the first Select one of the electrodes to operate; at least one sensing electrode is provided on the surface of the body and has a capacitance value; and a first control unit is respectively coupled to the first emitting electrode, the second emitting electrode and the sensing electrode, the first The control unit sets one of the first emission electrode and the second emission electrode to an enabled state according to the change in the capacitance value, and sets the other emission electrode of the first emission electrode and the second emission electrode at the same time It is floating. The active pen according to claim 1, wherein when the first emitting electrode is set to an enabled state, the active pen enters a first operating mode and the first emitting electrode generates a first for the first operating mode A signal, when the second transmitting electrode is set to the enabled state, the active pen enters a second operating mode and the second transmitting electrode generates a second signal for the second operating mode, the first signal The frequency band does not overlap with the frequency band of the second signal. The active pen according to claim 2, wherein the surface of the body has a first grip portion and a second grip portion, the first emitting electrode and the sensing electrode are disposed on the second grip portion, the second The grip portion is closer to the contact end than the first grip portion. The active pen according to claim 3, wherein the sensing electrode forms a self-capacitive sensing, when the sensing electrode is touched, the capacitance value increases and the active pen enters the second operation mode. The active pen according to claim 3, wherein the sensing electrode includes at least one first receiving electrode, the first receiving electrode and the first transmitting electrode form a mutual capacitance sensing, when the first receiving electrode and the first The emitter electrode is touched, the capacitance value drops and the active pen enters the second operation mode. The active pen according to claim 3, wherein the sensing electrode includes at least one first receiving electrode and at least one third transmitting electrode, the first receiving electrode and the third transmitting electrode form mutual capacitance sensing, when the first A receiving electrode and the third transmitting electrode are touched, the capacitance value decreases and the active pen enters the second operation mode. The active pen according to claim 1, wherein the side of the first emitting electrode close to the second emitting electrode has an edge, and the distance between the edge and the second emitting electrode is greater than 2 cm. A touch display system, including: the active pen as described in any one of the items 1 to 7; and a touch display module, including a display panel and a touch panel provided on the display panel, the touch The control panel includes: a first operating electrode; a second operating electrode; and a second control unit, coupled to the first operating electrode and the second operating electrode; wherein, when the first emitting electrode is in an enabled state, The second control unit determines the position of the active pen according to the electric field state of the first operation electrode; when the second emission electrode is in the enabled state, the second control unit determines the position of the active pen according to the difference between the second operation electrode and the second emission electrode The change in capacitance between them determines the position of the active pen. The touch display system according to claim 8, wherein the first operating electrode includes a transmitting electrode and a receiving electrode, when the transmitting electrode and the receiving electrode establish an electric field, and the second control unit detects the first The receiving electrode of the operating electrode generates an electric field change, and the second control unit determines the position of the active pen according to the electric field change. The touch display system according to claim 8, wherein the first operating electrode includes a transmitting electrode and a receiving electrode, when the transmitting electrode is in a floating state, and the second control unit detects the The receiving electrode changes from a state of no applied electric field to a state of applied electric field, and the second control unit determines the position of the active pen according to the state of the applied electric field.

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