Capacitive touch display device and awakening method thereof

Abstract

The invention provides a capacitive touch display device and an awakening method thereof. And controlling the touch display panel to adjust a touch sensing scanning frequency used for sensing the first touch tool or a frequency of a downlink signal of the second touch tool, so that the touch display panel can sense the touch operation of the first touch tool and the second touch tool in a default frequency range comprising the touch sensing scanning frequency. During the touch sensing period, the touch display panel is controlled to sense the touch operation of the first touch tool and the second touch tool at the same time. In response to the touch operation sensed by the touch display panel during the touch sensing period, the capacitive touch display device is awakened to enter a normal mode.

Description

Technical Field

[0001] The present invention relates to a touch device, and in particular to a capacitive touch display device and a wake-up method thereof. Background Art

[0002] Screen touch technology has been widely used in various consumer electronic devices, which allows users to intuitively select objects on the screen to achieve the effect of control. Electronic devices using touch devices often achieve the purpose of reducing power consumption by entering power saving mode. In power saving mode, the electronic device still needs to use a detection mechanism to determine whether to wake up the electronic device from power saving mode. Summary of the invention

[0003] The invention provides a capacitive touch display device and a wake-up method thereof, which can further reduce power consumption.

[0004] The capacitive touch display device of the present invention comprises a touch display panel and a control circuit. In a power saving mode, the control circuit controls the touch display panel to adjust a touch sensing scanning frequency for sensing a first touch tool or a frequency of a downlink signal of a second touch tool, so that the touch display panel can sense the touch operation of the first touch tool and the second touch tool within a default frequency range including the touch sensing scanning frequency, controls the touch display panel to sense the touch operation of the first touch tool and the second touch tool simultaneously during the touch sensing period, and responds to the touch operation sensed by the touch display panel during the touch sensing period, waking up the capacitive touch display device to enter a normal mode.

[0005] In an embodiment of the present invention, the touch sensing scanning frequency is an odd multiple of the frequency of the downlink signal.

[0006] In one embodiment of the present invention, the default frequency range is defined by an upper cutoff frequency and a lower cutoff frequency, and the upper cutoff frequency and the lower cutoff frequency are determined according to the noise level of the capacitive touch display device or the filter bandwidth of the capacitive touch display device.

[0007] In an embodiment of the present invention, the control circuit controls the touch display panel to send out an uplink signal during the uplink signal transmission period to adjust the frequency of the downlink signal of the second touch tool.

[0008] In one embodiment of the present invention, the first touching tool is a finger, and the second touching tool is an active touch pen.

[0009] In an embodiment of the present invention, the first touch tool and the second touch tool are active touch pens.

[0010] In an embodiment of the present invention, each frame period of the touch display panel includes only one touch sensing period.

[0011] In one embodiment of the present invention, the control circuit does not perform a touch position reporting operation during the touch sensing period.

[0012] The present invention also provides a method for waking up a capacitive touch display device, comprising the following steps. In a power saving mode, the touch display panel is controlled to adjust the touch sensing scanning frequency for sensing a first touch tool or the frequency of a downlink signal of a second touch tool, so that the touch display panel can sense the touch operation of the first touch tool and the second touch tool within a default frequency range including the touch sensing scanning frequency. During the touch sensing period, the touch display panel is controlled to simultaneously sense the touch operation of the first touch tool and the second touch tool. In response to the touch display panel sensing a touch operation during the touch sensing period, the capacitive touch display device is woken up to enter a normal mode.

[0013] In an embodiment of the present invention, the touch sensing scanning frequency is an odd multiple of the frequency of the downlink signal.

[0014] In one embodiment of the present invention, the default frequency range is defined by an upper cutoff frequency and a lower cutoff frequency, and the upper cutoff frequency and the lower cutoff frequency are determined according to the noise level of the capacitive touch display device or the filter bandwidth of the capacitive touch display device.

[0015] In one embodiment of the present invention, the above-mentioned awakening method of the capacitive touch display device includes, during the uplink signal transmission period, controlling the touch display panel to send out an uplink signal to adjust the frequency of the downlink signal of the second touch tool.

[0016] In one embodiment of the present invention, the first touching tool is a finger, and the second touching tool is an active touch pen.

[0017] In an embodiment of the present invention, the first touch tool and the second touch tool are active touch pens.

[0018] In an embodiment of the present invention, each frame period of the touch display panel includes only one touch sensing period.

[0019] In one embodiment of the present invention, the touch position reporting operation is not performed during the touch sensing period.

[0020] Based on the above, the embodiment of the present invention controls the touch display panel to adjust the scanning frequency for sensing the touch sensing operation of the first touch tool or the frequency of the downlink signal of the second touch tool, so that the touch display panel can sense the touch operation of the first touch tool and the second touch tool within the default frequency range including the touch sensing scanning frequency, and controls the touch display panel to sense the first touch tool and the second touch tool at the same time during the touch sensing period, and responds to the touch operation sensed by the touch display panel during the touch sensing period, and wakes up the capacitive touch display device to enter the normal mode. In this way, it is not necessary to sense the touch operations of the first touch tool and the second touch tool separately during different sensing periods, which increases the idle time of the capacitive touch display device when it is in the power saving mode, and can reduce the power consumption of the capacitive touch display device in the power saving mode.

[0021] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a capacitive touch display device according to an embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of a capacitive touch display device according to another embodiment of the present invention;

[0024] Figure 3 is an operation timing diagram of a capacitive touch display device according to an embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of a default frequency range according to an embodiment of the present invention;

[0026] Figure 5 FIG. 4 is a flow chart of a method for waking up a capacitive touch display device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the content of the present invention more understandable, the following embodiments are specifically cited as examples on which the present invention can be implemented. In addition, wherever possible, components / members with the same reference numerals are used in the drawings and embodiments to represent the same or similar components.

[0028] Please refer to the following Figure 1 , Figure 1 FIG. 1 is a schematic diagram of a capacitive touch display device according to an embodiment of the present invention. The capacitive touch display device 100 may include a control circuit 102 and a touch display panel 104 , wherein the control circuit 102 is coupled to the touch display panel 104 .

[0029] When the capacitive touch display device 100 is in a power saving mode, the control circuit 102 can control the touch display panel 104 to adjust the scanning frequency of the touch sensing TD used to sense the first touch tool T1 or the frequency of the downlink signal SD sent by the second touch tool T2, so that the touch display panel 104 can sense the touch operations of the first touch tool T1 and the second touch tool T2 within the default frequency range. The control circuit 102 can control the touch display panel 104 to sense the first touch tool T1 and the second touch tool T2 simultaneously during the touch sensing period, and respond to the touch operation sensed by the touch display panel 104 during the touch sensing period to wake up the capacitive touch display device 100 and enter the normal mode. It is worth noting that during the touch sensing period, the control circuit 102 does not perform the touch position reporting operation to reduce the power consumption of the capacitive touch display device 100. The first touch tool T1 and the second touch tool T2 can be as follows Figure 2 As shown, they are a finger and an active touch pen, but the present invention is not limited thereto. For example, in other embodiments, the first touch tool T1 may also be an active touch pen.

[0030] In detail, Figure 1 to Figure 3 As shown, when the capacitive touch display device 100 is in the power saving mode, the control circuit 102 can control the touch display panel 104 to send an uplink signal SU to the second touch tool T2 during the uplink signal transmission period TU in the frame period TF, so as to adjust the frequency of the downlink signal SD sent by the second touch tool T2, thereby enabling the touch display panel 104 to sense the touch operation of the first touch tool T1 and the second touch tool T2 within the default frequency range during the touch sensing period, for example, the capacitance change caused by the first touch tool T1 touching the touch display panel 104 can be sensed during the touch sensing period, or the downlink signal SD sent by the second touch tool T2 can be sensed. Among them, one frame period TF only includes one touch sensing period for sensing the touch operation of the first touch tool T1 and the second touch tool T2. In addition, the control circuit 102 can also adjust the scanning frequency of the touch sensing TD in the power saving mode, so that the touch display panel 104 can sense the touch operation of the first touch tool T1 and the second touch tool T2 within the default frequency range during the touch sensing period.

[0031] like Figure 4As shown, the default frequency range BW1 includes adjusting the scanning frequency fc of the touch sensing TD for sensing the first touch tool T1, and the default frequency range BW1 is defined by an upper cutoff frequency fH and a lower cutoff frequency fL. The default frequency range BW1 may be, for example, the filter bandwidth of the capacitive touch display device, and the amplitude value A1 may be, for example, -3dB, but is not limited thereto. In other embodiments, the upper cutoff frequency fH and the lower cutoff frequency fL may also be determined, for example, based on the noise level of the capacitive touch display device 100. In the case where the noise does not affect the sensing signal generated by the touch display panel 104 sensing the touch operation within the default frequency range BW1, the frequency values ​​of the upper cutoff frequency fH and the lower cutoff frequency fL may be adjusted, for example, the upper cutoff frequency fH may be increased and the frequency value of the lower cutoff frequency fL may be decreased, but is not limited thereto. The default frequency range BW1 covers odd-numbered multiples of the scanning frequency fc of the touch sensing TD. The frequency of the downlink signal SD sent by the second touch tool T2 can be adjusted to an odd-numbered multiple of the scanning frequency fc of the touch sensing TD. The odd-numbered multiples of the scanning frequency fc of the touch sensing TD referred to here can be, for example, 1, 3, or 5 times, or can also be a frequency that is approximately an odd-numbered multiple (for example, approximately 1, 3, or 5 times). For example, if the scanning frequency fc of the touch sensing TD is 100kHz, the frequency of the downlink signal SD sent by the second touch tool T2 can be adjusted to, for example, 100kHz, 200kHz, or 300kHz, so that the touch display panel 104 can sense the touch operations of the first touch tool T1 and the second touch tool T2 within the default frequency range BW1.

[0032] Since the touch display panel 104 can sense the touch operations of the first touch tool T1 and the second touch tool T2 within the default frequency range BW1, the control circuit 102 can control the touch display panel 104 to simultaneously sense the touch operations of the first touch tool T1 and the second touch tool T2 within one touch sensing period, without having to sense the touch operations of the first touch tool T1 and the second touch tool T2 separately during different sensing periods, thereby increasing the idle time of the capacitive touch display device 100 in the power saving mode and further reducing the power consumption of the capacitive touch display device 100 in the power saving mode.

[0033] When the touch display panel 104 senses a touch operation within the default frequency range BW1 (i.e., when the sensing amount occurs), the control circuit 102 can wake up the capacitive touch display device 100 to enter the normal mode to sense the touch position, wherein in the normal mode, one frame period TF may include two touch sensing periods, one of which is used to sense the touch operation of the first touch tool T1, and the other is used to sense the touch operation of the second touch tool T2. In the normal mode, the control circuit 102 can determine whether the sensed touch operation is a touch operation of the first touch tool T1 or the second touch tool T2, for example, it can be determined whether it is a touch operation of the first touch tool T1 or the second touch tool T2, or it is just a false operation caused by noise, based on whether the specific touch position can be detected. If the touch operation is a touch operation of the first touch tool T1 or the second touch tool T2, the touch position can be determined next. If the touch operation is not a touch operation by the first touch tool T1 or the second touch tool T2 but a false operation caused by a noise signal, for example, the control circuit 102 may control the capacitive touch display device 100 to enter the power saving mode again.

[0034] Figure 5 It is a flowchart of a method for waking up a capacitive touch display device according to an embodiment of the present invention, wherein. It can be seen from the above implementation that the method for waking up a capacitive touch display device from a power saving mode may include the following steps. First, the touch display panel is controlled to adjust the scanning frequency for sensing the touch sensing operation of the first touch tool or the frequency of the downlink signal of the second touch tool, so that the touch display panel can sense the touch operation of the first touch tool and the second touch tool within a default frequency range including the touch sensing scanning frequency (step S502). Wherein, the first touch tool may be, for example, a finger, and the second touch tool may be, for example, an active touch pen. The default frequency range is defined by an upper cutoff frequency and a lower cutoff frequency. The upper cutoff frequency and the lower cutoff frequency may be determined, for example, according to the noise level of the capacitive touch display device or the filter bandwidth of the capacitive touch display device. The touch sensing scanning frequency may be an odd multiple of the frequency of the downlink signal. In addition, the method for adjusting the frequency of the downlink signal of the second touch tool may be, for example, during the transmission period of the uplink signal within the frame period, controlling the touch display panel to send an uplink signal to adjust the frequency of the downlink signal of the second touch tool.

[0035] Next, during the touch sensing period, the touch display panel is controlled to simultaneously sense the touch operation of the first touch tool and the second touch tool (step S504), and it is determined whether the touch display panel senses the touch operation during the touch sensing period (step S506), that is, whether the sensing amount appears within the default frequency range BW1, wherein each frame period of the touch display panel includes only one touch sensing period. If the touch operation is not sensed, it can return to step S504 to sense the touch operation, and if the touch operation is sensed, the capacitive touch display device can be awakened to enter the normal mode and sense the touch position (step S508). And then, according to the sensing result of the touch position, it is determined whether the sensed touch operation is the touch operation of the first touch tool or the second touch tool, or a false operation caused by a noise signal (step S510). If it is a false operation caused by a noise signal, the power saving mode can be entered again, and it returns to step S502, and if it is a touch operation of the first touch tool or the second touch tool, a corresponding position signal can be provided according to the sensing result of the touch position (step S512).

[0036] In summary, the embodiment of the present invention controls the touch display panel to adjust the touch sensing scanning frequency for sensing the first touch tool or the frequency of the downlink signal of the second touch tool, so that the touch display panel can sense the touch operation of the first touch tool and the second touch tool within the default frequency range including the touch sensing scanning frequency, controls the touch display panel to sense the first touch tool and the second touch tool at the same time during the touch sensing period, and responds to the touch operation sensed by the touch display panel during the touch sensing period, awakens the capacitive touch display device to enter the normal mode. In this way, it is not necessary to sense the touch operations of the first touch tool and the second touch tool separately during different sensing periods, increases the idle time of the capacitive touch display device when it is in the power saving mode, and reduces the power consumption of the capacitive touch display device in the power saving mode.

[0037] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A capacitive touch display device, characterized in that: include: Touch display panel; as well as A control circuit, in a power saving mode, controls the touch display panel to adjust a touch sensing scanning frequency for sensing a first touch tool or a frequency of a downlink signal of a second touch tool, so that the touch display panel can sense the touch operations of the first touch tool and the second touch tool within a default frequency range including the touch sensing scanning frequency, controls the touch display panel to simultaneously sense the touch operations of the first touch tool and the second touch tool during touch sensing, and responds to the touch display panel sensing a touch operation during the touch sensing period, thereby waking up the capacitive touch display device to enter a normal mode.

2. The capacitive touch display device according to claim 1, characterized in that: The touch sensing scanning frequency is an odd multiple of the frequency of the downlink signal.

3. The capacitive touch display device according to claim 1, characterized in that: The default frequency range is defined by an upper cutoff frequency and a lower cutoff frequency, and the upper cutoff frequency and the lower cutoff frequency are determined according to a noise level of the capacitive touch display device or a filter bandwidth of the capacitive touch display device.

4. The capacitive touch display device according to claim 1, characterized in that: During the transmission of the uplink signal, the control circuit controls the touch display panel to send out the uplink signal to adjust the frequency of the downlink signal of the second touch tool.

5. The capacitive touch display device according to claim 1, characterized in that: The first touch tool is a finger, and the second touch tool is an active touch pen.

6. The capacitive touch display device according to claim 1, characterized in that: The first touch tool and the second touch tool are active touch pens.

7. The capacitive touch display device according to claim 1, characterized in that: Each frame period of the touch display panel includes only one touch sensing period.

8. The capacitive touch display device according to claim 1, characterized in that: The control circuit does not perform a touch position reporting operation during the touch sensing period.

9. A method for waking up a capacitive touch display device, characterized in that: include: In the power saving mode, the touch display panel is controlled to adjust a touch sensing scanning frequency for sensing a first touch tool or a frequency of a downlink signal of a second touch tool, so that the touch display panel can sense the touch operations of the first touch tool and the second touch tool within a default frequency range including the touch sensing scanning frequency; During a touch sensing period, controlling the touch display panel to simultaneously sense the touch operations of the first touch tool and the second touch tool; as well as In response to the touch display panel sensing a touch operation during the touch sensing period, the capacitive touch display device is awakened to enter a normal mode.

10. The method for waking up a capacitive touch display device according to claim 9, characterized in that: The touch sensing scanning frequency is an odd multiple of the frequency of the downlink signal.

11. The wake-up method of the capacitive touch display device according to claim 9, characterized in that: The default frequency range is defined by an upper cutoff frequency and a lower cutoff frequency, and the upper cutoff frequency and the lower cutoff frequency are determined according to a noise level of the capacitive touch display device or a filter bandwidth of the capacitive touch display device.

12. The method for waking up a capacitive touch display device according to claim 9, characterized in that: include: During the transmission of the uplink signal, the touch display panel is controlled to send out the uplink signal to adjust the frequency of the downlink signal of the second touch tool.

13. The method for waking up a capacitive touch display device according to claim 9, characterized in that: The first touch tool is a finger, and the second touch tool is an active touch pen.

14. The method for waking up a capacitive touch display device according to claim 9, characterized in that: The first touch tool and the second touch tool are active touch pens.

15. The method for waking up a capacitive touch display device according to claim 9, characterized in that: Each frame period of the touch display panel includes only one touch sensing period.

16. The method for waking up a capacitive touch display device according to claim 9, characterized in that: During the touch sensing period, no reporting operation of the touch position is performed.

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