TW201514810A - Electronic device and controlling method - Google Patents

Abstract

An electrical device includes a capacitive touch panel and a processing unit. The capacitive touch panel includes a first and a second sensor groups, a driving circuit and a detection circuit. The first and second sensor groups respectively have at least one sensor unit. The driving circuit has first and second terminals respectively to drive the sensor units of the first and second sensor groups. The driven sensor units are configured to receive a sensing energy. The detection circuit is configured to detect the sensing energy of the sensor unit. The processing unit is configured to control the driving circuit and to drive the first and second sensor groups simultaneously to process the touch detection, when any of the sensing energy of the sensor units is not only larger than a first predetermined energy but less than a second predetermined energy.

Description

Electronic device and control method

The present invention relates to a touch panel, and more particularly to a touch panel capable of adjusting a driving manner.

More and more electronic devices now have a touch panel. The user usually controls the electronic device via the touch panel by means of a finger or a stylus. At present, the touch panel of most electronic devices is a capacitive touch panel. The capacitive touch panel uses a capacitor as a sensing unit of the touch panel. When a finger or a stylus touches the touch panel, the amount of charge of the sensing unit corresponding to the touch behavior changes. If the amount of charge in the sensing unit changes, the voltage of the sensing unit will change accordingly according to the amount of charge. And if the electronic device detects that the variation range of the voltage of the sensing unit is greater than a threshold value, the electronic device determines that the sensing unit is touched by the user and displays the corresponding touch track on the touch panel.

When the user touches the electronic device with the stylus, the contact area between the stylus and the touch panel is small, so that the amount of charge change caused by the stylus to the sensing unit is small. Therefore, the variation range of the voltage of the sensing unit is smaller than the critical value. If the variation range of the voltage of the sensing unit is less than the threshold value, the electronic device determines that the sensing unit is not touched by the user, and does not display the corresponding touch track on the touch panel, so that a leak occurs.

In order to improve the electronic device's inability to recognize the touch behavior of the stylus (or to improve the leakage point), some electronic devices may lower the threshold value, so that the touch range of the stylus causes the voltage variation range of the sensing unit to be greater than the reduction. After the critical value, the electronic device can recognize the touch behavior of the stylus. However, lowering the threshold will cause the voltage variation range of the sensing unit due to noise interference to be greater than the threshold after the reduction. Therefore, the electronic device determines the noise as the user's touch behavior, and displays the corresponding touch track on the touch panel, and an error report occurs.

Therefore, there is a need to improve the occurrence of a leak or an error in the touch panel.

The invention provides an electronic device comprising a capacitive touch panel and a processing unit. The capacitive touch panel includes first and second sensing groups, a driving circuit, and a detecting circuit. The first and second sensing groups each have at least one sensing unit. The driving circuit has first and second output terminals for respectively driving the sensing units of the first and second sensing groups. Each sensing unit is driven to receive an inductive energy. The detecting circuit is used to detect the sensing energy of the sensing unit. The processing unit is configured to control the driving circuit to simultaneously drive the first sensing group and the second sensing group to perform touch when the sensing energy of any one of the sensing units is greater than a first predetermined energy and less than a second predetermined energy. Detection.

The present invention provides a control method suitable for use in an electronic device. The electronic device includes a capacitive touch panel and a processing unit. The capacitive touch panel has first and second sensing groups, a driving circuit and a detecting circuit. The control method includes receiving, by the detecting circuit, each sensing unit of the first and second sensing groups One of the sensing energy; and when any one of the sensing units has an inductive energy greater than a first predetermined energy and less than a second predetermined energy, the processing unit controls the driving circuit to simultaneously drive the first sensing group and the second sensing The group performs touch detection.

5‧‧‧Electronic devices

10‧‧‧Capacitive touch panel

11‧‧‧Drive circuit

12‧‧‧Detection circuit

D1-DM‧‧‧Induction Group

C ₁₁ -C _1N , C ₂₁ -C _2N , C _M1 -C _MN ‧‧‧ sensing unit

TX1-TXM‧‧‧ output

TX‧‧‧ drive electrode

RX‧‧‧Induction electrode

RX ₁₁ -RX _MN ‧‧‧ signal line

Q ₁ , Q ₂ ‧ ‧ charge

V1, V2‧‧‧ voltage

G1, G2, G3‧‧‧ energy interval

E1, E2, E3‧‧‧ Inductive energy

Th1‧‧‧ first preset energy

Th2‧‧‧ second preset energy

1 is a schematic view of an electronic device provided by the present invention; 2A-2B is a schematic view showing the operation of the sensing unit provided by the present invention; and FIG. 3A-3C is a schematic view showing the operation of the processing unit provided by the present invention; -4C is a schematic diagram of the sensing unit receiving the different sensing energy provided by the present invention; FIG. 5 is a flow chart showing the operation of the electronic device provided by the present invention; and FIG. 6 is another schematic diagram of the electronic device provided by the present invention; And Figures 7A-7C are schematic views of the operation of the electronic device provided by the present invention.

The apparatus and method of use of various embodiments of the present invention are discussed in detail below. However, it is to be noted that many of the possible inventive concepts provided by the present invention can be implemented in various specific ranges. These specific examples are only intended to illustrate the apparatus and methods of use of the present disclosure, but are not intended to limit the scope of the invention.

Figure 1 is a schematic illustration of an electronic device in accordance with the present invention. As shown in FIG. 1 , the electronic device 5 includes a capacitive touch panel 10 and a processing unit 30 . In the present embodiment, the capacitive touch panel 10 includes a first sensing group D1, a second sensing group D2, a driving circuit 11, and a detecting circuit 12, but is not limited thereto. In this embodiment, the first sensing group D1 and the second sensing group D2 respectively have N sensing units C ₁₁ -C _1N and C ₂₁ -C _2N . In another embodiment, the number of sensing units in the first sensing group D1 is different from the number of sensing units in the second sensing group D2, but is not limited thereto. In the embodiment of the present invention, each sensing group can be regarded as a column of sensing units, but is not limited thereto. In another embodiment, the number of sensing groups is M group, and M is greater than 1 (1st to Mth sensing groups), but is not limited thereto.

The driving circuit 11 has a first output terminal TX1 and a second output terminal TX2. The first output terminal TX1 is electrically connected to one end (drive electrode) of each sensing unit in the first sensing group D1. The second output terminal TX2 is electrically connected to one end (drive electrode) of each of the second sensing groups D2. The driving circuit 11 is configured to drive the sensing units C ₁₁ -C _1N and C ₂₁ -C _2N in the first sensing group D1 and the second sensing group D2 to perform touch detection. In an embodiment, a sensing unit is driven by the driving circuit 11 to receive an inductive energy for touch detection. For example, the sensing unit is a capacitor, and after the sensing unit is driven (having a first amount of charge), if the finger touches the sensing unit, the sensing unit receives the sensing energy from the finger, so that the amount of charge of the sensing unit changes. (a second amount of charge). In another embodiment, the time period during which the sensing unit is driven to receive the inductive energy may also be referred to as a scanning period, but is not limited thereto.

The detecting circuit 12 is configured to detect the sensing energy of each sensing unit according to the amount of charge change of each sensing unit in the first sensing group D1 and the second sensing group D2. In this embodiment, the induced energy detected by the detecting circuit 12 is proportional to the amount of charge change. In this embodiment, the detecting circuit 12 is electrically connected to the other end (sensing electrode) of each sensing unit by a dedicated signal line for detecting the sensing energy of the sensing unit. For example, in the present embodiment, the detection circuit 12 by a signal line dedicated RX ₁₁ is electrically connected to the sensing unit C _11, C ₁₂ is connected to the sensing unit dedicated by the RX signal line ₁₂ electrically, and by The dedicated signal line RX _{21 is} electrically connected to the sensing unit C ₂₁ , and so on.

Please refer to FIG. 2A-2B, and FIG. 2A-2B is used to illustrate the change of the induction energy of the sensing unit. The sensing unit Cx in FIG. 2A-2B may be any sensing unit of the first sensing group D1 or the second sensing group D2 in FIG. 1 . The sensing unit Cx has a driving electrode TX and a sensing electrode RX. In this embodiment, the driving electrode TX of the sensing unit Cx is electrically coupled to the output end of the driving circuit 11, but is not limited thereto. As shown in Figure 2A, when the sensor element drive circuit 11 is driven Cx (or at the time of scanning period), having a first sensing unit Cx charge amount Q _1, and has a voltage V1 on the sensing electrode RX. When the finger or the stylus touches the touch panel, the amount of charge on the sensing unit Cx is changed, so that the amount of charge of the sensing unit Cx becomes a second amount of charge Q ₂ and has a voltage V2 on the sensing electrode RX ( As shown in Figure 2B). The detecting circuit 12 detects the induced energy according to the amount of change in charge. In other words, when the amount of charge of the sensing unit Cx changes, the voltage of the sensing unit Cx also changes accordingly, and the detecting circuit 12 can calculate the induced energy from the amount of fluctuation of the voltage. In this embodiment, when the voltage variation range is larger (or the amount of charge change is larger), the inductive energy received by the sensing unit is larger. In one embodiment, if the amount of change in the voltage of the sensing unit during the scanning period is zero, the sensing energy of the sensing unit is zero.

Referring to FIG. 1 again, the processing unit 30 in FIG. 1 may be a central processing unit (CPU), a single-chip controller, or a microcontroller, but is not limited thereto. In this embodiment, the processing unit 30 is configured to control the driving circuit 11 to drive according to the sensing energy detected by the detecting circuit 12 A sensing group D1 and a second sensing group D2. Please refer to FIG. 3A-3C. FIG. 3A-3C is used to illustrate that the processing unit 30 controls the driving mode of the driving circuit by the driving circuit 11 according to the sensing energy. When the detecting circuit 12 detects that the sensing energy of any one of the sensing units is greater than a first predetermined energy Th1 and less than a second predetermined energy Th2 (for example, the sensing energy falls in the sensing energy interval G2 of FIG. 3A), Then, the processing unit 30 controls the driving circuit 11 to simultaneously drive the first and second sensing groups D1 and D2 to perform touch detection (as shown in FIG. 3B). When the sensing energy of the sensing unit received by the processing unit 30 is less than or equal to the first preset energy Th1 (for example, the sensing energy interval G1 of FIG. 3A), or the sensing energy of any one of the receiving sensing units is greater than or equal to When the second preset energy Th2 (for example, the sensing energy interval G3 in FIG. 3A), the processing unit 30 controls the driving circuit 11 to alternately drive the first sensing group D1 and the second sensing group D2 to perform touch detection (eg, 3C). Figure shows). In one embodiment, the drive circuit 11 alternately drives all of the sensing groups to simultaneously drive all of the sensing groups to save power.

Figures 4A-4C are schematic diagrams of different inductive energies received by the sensing unit. Figure 4A shows the induced energy E1 caused by the noise to the sensing unit, but is not limited thereto. Figure 4B shows the induced energy E2 caused by the stylus to the sensing unit, but is not limited thereto. The 4C is the induced energy E2 caused by the finger to the sensing unit, but is not limited thereto. As shown in FIG. 4A-4C, the time when the induced energy E2 and E3 caused by the human touch the touch panel (for example, using the stylus or the finger to touch the touch panel) is continuously greater than the first preset energy Th1 (for example, 1-2 milliseconds (ms)) will be much longer than the time when the induced energy E1 caused by the noise continues to be greater than the first preset energy Th1 (for example, 1-10 microseconds (us)). In one embodiment, the peak value of the inductive energy E1 and the inductive energy E2 are similar, but not limited thereto. In this embodiment, the peak value of the inductive energy E1 and the inductive energy E2 is greater than the first A predetermined energy Th1, but less than the second predetermined energy Th2, and the peak of the induced energy E3 is greater than or equal to the second predetermined energy Th2.

Figure 5 is a flow chart showing the operation of the electronic device of the present invention. The process starts in step S51, and determines whether the sensing energy of any one of the sensing units is greater than the first preset energy Th1 and less than the second preset energy Th2. When the processing unit 30 determines that the sensing energy of any one of the sensing units is greater than the first preset energy Th1 but less than the second preset energy Th2, the process proceeds to step S52; otherwise, the process proceeds to step S53. For example, when the processing unit 30 determines that the detecting circuit 12 has the sensing energy E1 and E2 as shown in FIGS. 4A and 4B on any of the sensing units, the processing unit 10 proceeds to step S52.

In this embodiment, when the detecting circuit 12 detects that all the sensing units receive the sensing energy less than or equal to the first preset energy Th1, or the detecting circuit 12 detects any one of the sensing units received When the induced energy is greater than or equal to the second predetermined energy Th2, the process proceeds to step S53. For example, when the detecting circuit 12 detects the inductive energy E3 as shown in FIG. 4C, it proceeds to step S53.

In step S52, the processing unit 30 controls the drive circuit 11 to simultaneously drive all the sensing groups, and proceeds to step S54. For example, the processing unit 30 controls the drive circuit 11 to simultaneously drive the first and second sensing groups D1 and D2 in the manner shown in FIG. 3B.

In step S53, the processing unit 30 controls the drive circuit 11 to alternately drive all of the sensing groups, and proceeds to step S54. For example, the processing unit 30 controls the drive circuit 11 to alternately drive the first and second sensing groups D1 and D2 in the manner shown in FIG. 3C.

In step S54, the processing unit 30 determines any one of the sensing units. Whether the time during which the inductive energy continues to be greater than the first preset energy is greater than a predetermined time. When the processing unit 30 determines that the sensing energy of any one of the sensing units continues to be greater than the first preset energy for more than the preset time, the process proceeds to step S56; otherwise, the process proceeds to step S57. In an embodiment, the preset time may be 100 microseconds, 500 microseconds, or 1 millisecond, but is not limited thereto.

In step S55, the processing unit 30 determines whether the sensing energy of any one of the sensing units is greater than or equal to the second preset energy Th2. When the processing unit 30 determines that the sensing energy of any one of the sensing units is greater than the second preset energy Th2, the process proceeds to step S56; otherwise, the process proceeds to step S57. For example, if the sensing unit receives the finger touch so that the induced energy is greater than the second preset energy, the process proceeds to step S56. For example, the sensing unit receives the induced energy caused by the noise, and the induced energy is less than or equal to the first preset energy Th1, so the process proceeds to step S57.

In step S56, the processing unit 30 determines that any of the above sensing units is touched by an object. In step S57, the processing unit 30 determines that the sensing unit is not touched by the object. In an embodiment, when the processing unit 30 determines that the sensing unit is touched, the processing unit 30 displays the corresponding touch trajectory on the capacitive touch panel 10, but is not limited thereto. For example, when the sensing energy received by the sensing unit continues to be greater than the first preset energy Th1 by 2 milliseconds and is greater than the preset time (assumed to be 100 microseconds), the processing unit 30 determines that the sensing unit is controlled by the object. Touch. In one embodiment, when the processing unit 30 determines that the sensing unit is touched by the object, the processing unit 30 displays the corresponding touch track on the capacitive touch panel 10.

In another embodiment, when the sensing energy received by the sensing unit continues to be greater than the first preset energy Th1, the time is 2 microseconds, and is less than the preset time. (Assuming 100 microseconds), the processing unit 30 determines that the sensing unit is not touched by the object, but is a change in the induced energy caused by the noise. In one embodiment, when the processing unit 30 determines that the sensing unit is not touched by the object, the processing unit 30 does not display the corresponding touch track on the capacitive touch panel 10.

In an embodiment, when the capacitive touch panel 10 does not receive any touch behavior (or the sensing energy of the sensing unit is less than or equal to the first preset energy Th1), the processing unit 30 controls the driving circuit 11 to alternately drive. (Scan) all sensing groups. For example, the processing unit 30 drives the first to the 100th sensing groups sequentially (alternately) in a time period of 2 milliseconds, so the driving time of each sensing group is 20 microseconds.

When any one of the sensing units receives the inductive energy greater than the first preset energy Th1 and less than the second preset energy Th2, the processing unit 30 controls the driving circuit 11 to simultaneously drive (scan) all the sensing groups. For example, the processing unit 30 simultaneously drives the first to the 100th sensing groups in a 2 millisecond time period, so the driving time of each sensing group is 2 milliseconds. In an embodiment, when the processing unit 30 controls the driving circuit 11 to simultaneously drive (scan) all the sensing groups, and any one of the interval sensing units does not receive the sensing energy greater than the first preset energy Th1 and is less than the first When the energy Th2 is preset, the processing unit 30 controls the driving circuit 11 to switch to alternately scan all the sensing groups. For example, the interval time may be 1 second, 10 seconds, one minute, or five minutes, but not limited thereto.

Figure 6 is another schematic view of an electronic device in accordance with the present invention. The electronic device of FIG. 6 is similar to that of FIG. 1 except that the electronic device of FIG. 6 has an M group of sensing groups, and the related operations are similar to those of the electronic device of FIG. 1 and will not be described herein.

7A-7C are diagrams for explaining the operation of the electronic device of FIG. 6 to receive the induced energy E1-E3 (as shown in FIG. 4). As shown in FIG. 7A, when the first output terminal TX1 of the driving circuit 11 is at a high level from t1 to t2, it indicates that the first sensing group D1 is driven (or is a scanning period). Since the first set of inductive sensing unit C ₁₁ D1 receives inductive energy E1, and E1 inductive energy is greater than the duration time of the first predetermined energy, (e.g., 2 microseconds) is smaller than the predetermined time (e.g., 1 msec), the processing unit 30 It is judged that the sensing unit C ₁₁ is not touched by the object.

As shown in FIG. 7B the first time, since the first group of sensing D1 sensing unit C ₁₁ receives inductive energy E2, and E2 inductive energy than the first preset duration of energy (e.g., 1.8 milliseconds) is greater than the predetermined time (e.g., 1 ms The processing unit 30 determines that the sensing unit C ₁₁ is touched by an object such as a stylus.

, Since the first group of sensing D1 sensing unit C ₁₁ receives inductive energy E3, E3 and inductive energy greater than a second predetermined duration of energy as in FIG 7C, the processing unit 30 determines the object sensing unit is C ₁₁ (e.g., a finger ) Touch.

In summary, when the inductive energy received by the electronic device of the present invention (for example, the sensing energy of the stylus) is close to the sensing energy of the noise, it can be determined by increasing the driving (scanning) time of each sensing group. Whether the sensing unit is touched by an object to avoid false reporting. At the same time, when the received inductive energy is low (for example, the touch of the stylus), no leakage occurs. Therefore, the present invention can effectively improve the error reporting points and the leakage points that occur in the conventional touch panel.

The above is only the preferred embodiment of the present disclosure, and the scope of the disclosure is not limited thereto, that is, the simple equivalent changes and modifications made by the disclosure of the patent application scope and the description of the invention, Still belong to this Cover the scope of the patent coverage. In addition, any of the embodiments or advantages of the present disclosure are not required to achieve all of the objects or advantages or features disclosed in the present disclosure. In addition, the abstract sections and headings are only used to assist in the search of patent documents and are not intended to limit the scope of the disclosure.

S51-S57‧‧‧Steps

Claims (10)

An electronic device includes: a capacitive touch panel, comprising: first and second sensing groups respectively having at least one sensing unit; a driving circuit having a first output end for driving the first sensing group The sensing unit and the second output end are used to drive the sensing unit of the second sensing group, wherein each of the sensing units is driven to receive an inductive energy; and a detecting circuit is configured to detect the sensing The sensing energy of the unit; and a processing unit configured to control the driving circuit to be driven simultaneously when the sensing energy of any one of the sensing units is greater than a first predetermined energy and less than a second predetermined energy The first sensing group and the second sensing group perform touch detection. The electronic device of claim 1, wherein the processing energy of the processing unit in all of the sensing units is less than the first predetermined energy, or the sensing energy of any one of the sensing units is greater than In the second preset energy, the processing unit controls the scan driving circuit to alternately drive the first and second sensing groups to perform touch detection. The electronic device of claim 1, wherein the processing unit determines the sensing unit when the sensing energy of any one of the sensing units is longer than the first predetermined energy for more than a predetermined time. Any of the above is touched by an object. The electronic device of claim 1, wherein the processing unit determines the sensing unit when the sensing energy of any one of the sensing units is longer than the first predetermined energy for less than a predetermined time. Any of the above is not touched by an object. The electronic device of claim 1, wherein the sensing unit has a driving electrode and a sensing electrode, and the driving electrode of the sensing unit of the first sensing group is electrically connected to the first output end. And the driving electrode of the sensing unit of the second sensing group is electrically connected to the second output end. The electronic device of claim 5, wherein the sensing electrodes of each of the sensing units of the first and second sensing groups are electrically connected to the detecting circuit by a dedicated signal line. The electronic device of claim 1, wherein the induced energy is proportional to a charge change amount of one of the sensing units. A control method is applicable to an electronic device. The electronic device includes a capacitive touch panel and a processing unit. The capacitive touch panel has first and second sensing groups, a driving circuit, and a detecting circuit. The method includes: receiving, by the detecting circuit, an inductive energy of each of the sensing units of the first and second sensing groups; and when the sensing energy of any one of the sensing units is greater than a first predetermined energy and When the processing power is less than a second preset energy, the processing unit controls the driving circuit to simultaneously drive the first sensing group and the second sensing group to perform touch detection; When the sensing energy of all the sensing units is less than the first predetermined energy, or the sensing energy of any one of the sensing units is greater than the second predetermined energy, the processing unit controls the driving circuit to alternate The first and second sensing groups are driven to perform touch detection. The control method of claim 8, wherein the processing unit determines the sensing unit when the sensing energy of any one of the sensing units is longer than the first predetermined energy for more than a predetermined time. Any of the above is touched by an object. The control method of claim 8, wherein the processing unit determines the sensing unit when the sensing energy of any one of the sensing units is longer than the first predetermined energy for less than a predetermined time. Any of the above is not touched by an object.