Interaction method of external object and touch display equipment, touch processor, touch display equipment and touch system

Abstract

The invention provides an interaction method of an external object and touch display equipment, which comprises the following steps: one image refresh cycle of the touch display equipment comprises a plurality of display driving time periods and non-display driving time periods which are alternated with each other, and the plurality of non-display driving time periods comprise four first touch time periods and eight second touch time periods, each first touch control time period or each second touch control time period is a non-display driving time period, at least two second touch control time periods are located between two adjacent first touch control time periods, and two second touch control time periods exist between every two adjacent first touch control time periods in the four first touch control time periods; and the touch display device receives a communication signal from the active object, senses a touch signal of the passive object via the touch sensor during four first touch periods to detect a touch of the passive object, and senses a touch signal of the active object via the touch sensor during eight second touch periods to detect a touch of the active object.

Description

Interaction method between external object and touch display device, touch processor, touch display device and touch system

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202211663504.2 filed on December 23, 2022 and PCT patent application No. PCT / CN2023 / 125483 filed on October 19, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of display technology, and in particular, to a method for interaction between an external object and a touch display device, a touch processor, a computer-readable storage medium, a touch display device, and a touch system. Background Art

[0004] With the development and advancement of information technology, people's demand for touch display devices that have both touch and display functions is gradually increasing. Display devices such as liquid crystal display devices, organic light-emitting diode display devices, and plasma display devices can all integrate touch functions to form touch display devices. Touch display devices allow users to input information or commands in an intuitive and convenient manner without using components such as buttons, keyboards, or mice. Moreover, more and more application software requires high-precision touch for touch display devices, resulting in an increasing number of styluses (including active pens and passive pens) and gradually increasing performance requirements for styluses. Pen touch technology can now achieve communication between a stylus (e.g., an active pen) and a touch display device, enabling bidirectional data transmission between the pen and the touch display device. Although various communication methods between pens and touch display devices have been developed, existing communication methods are difficult to support the improvement of the display performance of touch display devices.

[0005] Summary of the Invention

[0006] According to a first aspect of the present disclosure, a method for interaction between an external object and a touch display device is provided, the touch display device including a touch sensor, wherein the interaction method includes: an image refresh cycle of the touch display device includes multiple display drive periods and multiple non-display drive periods, the display drive periods and the non-display drive periods alternate with each other, the multiple non-display drive periods include multiple first touch periods and multiple second touch periods, each first touch period or each second touch period is a non-display drive period, wherein the image refresh cycle includes at least two second touch periods located between two adjacent first touch periods; and the external object includes an active object or a passive object, the touch display device receives a communication signal from the active object, senses a touch signal of the passive object via the touch sensor during the multiple first touch periods to detect the touch of the touch display device by the passive object, and senses a touch signal of the active object via the touch sensor during the multiple second touch periods to detect the touch of the touch display device by the active object.

[0007] In some embodiments, there is at least one second touch period between every two adjacent first touch periods in the image refresh cycle.

[0008] In some embodiments, the one image refresh cycle includes eight second touch periods and four first touch periods, and two second touch periods exist between every two adjacent first touch periods in the four first touch periods.

[0009] In some embodiments, the one image refresh cycle includes four second touch periods and four first touch periods, and there is one second touch period between every two adjacent first touch periods in the four first touch periods.

[0010] In some embodiments, detecting the touch of the passive object on the touch display device and detecting the touch of the active object on the touch display device respectively include collecting the touch signal of the passive object sensed by the touch sensor and collecting the touch signal of the active object sensed by the touch sensor, wherein the multiple non-display periods also include a noise processing period, and the method further includes: during the noise processing period, obtaining a signal-to-noise ratio of at least one of the touch signal of the active object or the touch signal of the passive object; and in response to the signal-to-noise ratio being lower than a threshold, adjusting the frequency of collecting the touch signal of the active object or the passive object.

[0011] In some embodiments, each first touch time period in the plurality of first touch time periods and each second touch time period in the plurality of second touch time periods have the same time length, and the time length does not exceed 180 microseconds.

[0012] In some embodiments, the plurality of non-display periods in the one image refresh cycle further include a noise processing period, and the sum of the first touch periods and the second touch periods on both sides of the noise processing period is equal in number.

[0013] In some embodiments, the interaction method further includes: the touch display device does not receive a communication signal from the active object, and senses a touch signal of a passive object via the touch sensor during the multiple second touch time periods to detect the passive object touching the touch display device.

[0014] In some embodiments, the interaction method further includes: the touch display device does not receive a communication signal from the active object, and the touch display device does not detect the active object or the passive object touching the touch display device during the multiple first touch time periods.

[0015] In some embodiments, the interaction method also includes: the touch display device does not receive a communication signal from the active object, and senses the touch signal of the passive object via the touch sensor during the multiple second touch time periods and the multiple first touch time periods to detect the touch of the passive object on the touch display device.

[0016] In some embodiments, the one image refresh cycle includes six second touch periods and four first touch periods, and two second touch periods exist between every two adjacent first touch periods in the four first touch periods.

[0017] In some embodiments, the one image refresh cycle includes five second touch periods and four first touch periods, and there is one second touch period between every two adjacent first touch periods in the four first touch periods.

[0018] In some embodiments, the method for interaction between an external object and a touch display device also includes: the touch display device sends an uplink signal to the external object, and periodically sends the uplink signal to the external object with the image refresh period of the touch display device as the sending period, and the uplink signal includes 7 bits of data.

[0019] In some embodiments, the uplink signal is encoded using direct sequence spread spectrum, and each bit of data is encoded as a P-bit spread spectrum code sequence, where P is a positive integer.

[0020] In some embodiments, each bit of data is encoded as a 31-bit spreading code sequence.

[0021] In some embodiments, the touch signal of the active object includes pressure information for indicating the touch pressure of the active object on the touch display device, and the pressure information includes multi-bit pressure information encoding, wherein the touch signal of the active object is sensed via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device, including: receiving pressure information encoding of different bits in the multi-bit pressure information encoding via the touch sensor during at least two second touch time periods among the multiple second touch time periods, respectively.

[0022] In some embodiments, the image refresh cycle includes eight second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the pressure information includes twelve-bit pressure information encoding, and the receiving of different bits of pressure information encoding in the multi-bit pressure information encoding via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the twelve bits of pressure information encoding via the touch sensor during six of the eight second touch periods, and receiving two bits of pressure information encoding in the twelve bits of pressure information encoding via the touch sensor during each of the six second touch periods.

[0023] In some embodiments, the active object includes a power supply, the touch signal of the active object includes power information for indicating the state of the power supply, and the power information includes a multi-bit power information code, wherein sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving power information codes of different bits in the multi-bit power information code via the touch sensor during at least two second touch time periods among the multiple second touch time periods, respectively.

[0024] In some embodiments, the power information includes a four-bit power information code, and receiving the power information code of different bits in the multi-bit power information code via the touch sensor during at least two second touch time periods among the multiple second touch time periods includes: receiving the four-bit power information code via the touch sensor during four second touch time periods among the eight second touch time periods.

[0025] In some embodiments, the active object includes multiple keys, the touch signal of the active object includes key information for indicating the status of the multiple keys, and the key information includes multi-bit key information codes corresponding to the multiple keys, wherein during the multiple second touch time periods, sensing the touch signal of the active object via the touch sensor to detect the touch of the active object on the touch display device includes: receiving key information codes of different bits in the multi-bit key information code via the touch sensor during at least two second touch time periods among the multiple second touch time periods.

[0026] In some embodiments, the touch signal of the active object includes hover information for indicating that the active object is in a hovering state, and identification information for indicating an identification of the active object, the hover information includes a hover information code, and the identification information includes an identification information code, wherein sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving the hover information code and the identification information code via the touch sensor during different second touch time periods among the multiple second touch time periods.

[0027] In some embodiments, the touch signal of the active object includes a multi-bit touch signal code, and the multi-bit touch signal code includes at least one of a multi-bit pressure information code, a multi-bit power information code, a multi-bit key information code, a hover information code, an identification information code and a check bit code, wherein the touch signal of the active object is sensed via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device, including: during each of the second touch time periods, receiving three to six touch signal codes in the multi-bit touch signal code via the touch sensor.

[0028] In some embodiments, each touch signal code in the three to six-bit touch signal code includes a multi-bit pulse sequence, and the multi-bit pulse sequences in touch signal codes of different bits in the three to six-bit touch signal code have different phases.

[0029] According to a second aspect of the present disclosure, a method for interaction between an external object and a touch display device is provided, the touch display device including a touch sensor, the method comprising: an image refresh cycle of the touch display device including a plurality of display drive periods and a plurality of non-display drive periods, the display drive periods and the non-display drive periods alternating with each other, the plurality of non-display drive periods including a plurality of first touch periods and a plurality of second touch periods, each first touch period or each second touch period being a non-display drive period, wherein the image refresh cycle includes at least two second touch periods located between at least two first touch periods; and the external object includes an active object or a passive object, the touch display device receives a communication signal from the active object, senses a touch signal of the passive object via the touch sensor during the plurality of first touch periods to detect a touch of the touch display device by the passive object, and senses a touch signal of the active object via the touch sensor during the plurality of second touch periods to detect a touch of the touch display device by the active object.

[0030] In some embodiments, the image refresh cycle includes at least two second touch periods located between a group of two adjacent first touch periods, or the image refresh cycle includes at least two second touch periods located between two groups of two adjacent first touch periods.

[0031] In some embodiments, there is at least one second touch period between every two adjacent first touch periods in the image refresh cycle.

[0032] In some embodiments, the one image refresh cycle includes eight second touch periods and four first touch periods, and two second touch periods exist between every two adjacent first touch periods in the four first touch periods.

[0033] In some embodiments, the one image refresh cycle includes six second touch periods and four first touch periods, and two second touch periods exist between every two adjacent first touch periods in the four first touch periods.

[0034] In some embodiments, the one image refresh cycle includes four second touch periods and four first touch periods, and there is one second touch period between every two adjacent first touch periods in the four first touch periods.

[0035] In some embodiments, the one image refresh cycle includes five second touch periods and four first touch periods, and there is one second touch period between every two adjacent first touch periods in the four first touch periods.

[0036] In some embodiments, in the image refresh cycle, there is at least one group of two adjacent first touch periods without the second touch period between them.

[0037] In some embodiments, the image refresh cycle includes six second touch periods and four first touch periods, among the four first touch periods, there is no second touch period between two adjacent groups of the first touch periods, and there is at least two second touch periods between one adjacent group of the first touch periods.

[0038] In some embodiments, the image refresh cycle includes six second touch periods and four first touch periods, among which there is a group of two adjacent first touch periods without a second touch period, and there is at least one second touch period between two adjacent first touch periods.

[0039] In some embodiments, the plurality of non-display driving periods in the one image refresh cycle further include a noise processing period.

[0040] In some embodiments, the number of the first touch periods and the second touch periods on both sides of the noise processing period is equal.

[0041] In some embodiments, the touch display device sends an uplink signal to the external object, and periodically sends the uplink signal to the external object with the image refresh period of the touch display device as the sending period, and the time period corresponding to the uplink signal includes a noise processing period.

[0042] In some embodiments, detecting the touch of the passive object on the touch display device and detecting the touch of the active object on the touch display device respectively include collecting the touch signal of the passive object sensed by the touch sensor and collecting the touch signal of the active object sensed by the touch sensor. The method also includes: during the noise processing period, obtaining the signal-to-noise ratio of at least one of the touch signal of the active object or the touch signal of the passive object; and in response to the signal-to-noise ratio being lower than a threshold, adjusting the frequency of collecting the touch signal of the active object or the passive object.

[0043] In some embodiments, a time length of each first touch period in the plurality of first touch periods and a time length of each second touch period in the plurality of second touch periods do not exceed a first threshold.

[0044] In some embodiments, the first threshold is 180 microseconds.

[0045] In some embodiments, each of the first touch periods and each of the second touch periods have the same time length.

[0046] In some embodiments, the interaction method further includes: if the touch display device does not receive a communication signal from the active object, the touch display device senses the touch signal of the passive object via the touch sensor during the multiple second touch time periods to detect the touch of the passive object on the touch display device.

[0047] In some embodiments, the interaction method further includes: if the touch display device does not receive a communication signal from the active object, the touch display device does not detect the touch of the active object and the passive object on the touch display device during the multiple first touch time periods.

[0048] In some embodiments, if the touch display device does not receive a communication signal from the active object, the touch display device does not detect the touch of the active object and the passive object on the touch display device in two non-display driving periods among the multiple non-display driving periods, and detects the touch signal of the passive object sensed by the touch sensor in other non-display driving periods among the multiple non-display driving periods except the two non-display driving periods to detect the touch of the touch display device by the passive object.

[0049] In some embodiments, the interaction method also includes: if the touch display device does not receive a communication signal from the active object, the touch display device senses the touch signal of the passive object via the touch sensor during the multiple second touch time periods and the multiple first touch time periods to detect the touch of the passive object on the touch display device.

[0050] In some embodiments, the interaction method also includes: the touch display device sends an uplink signal to the external object, and periodically sends the uplink signal to the external object with the image refresh period of the touch display device as the sending period, and the uplink signal includes a first character segment, and the first character segment is used to represent the current image refresh period of the touch display device.

[0051] In some embodiments, the uplink signal further includes a second character segment, and the second character segment is used to represent the frequency at which the active object sends a downlink signal to the touch display device.

[0052] In some embodiments, the uplink signal comprises 7 bits of data.

[0053] In some embodiments, the uplink signal is encoded using direct sequence spread spectrum, and each bit of data is encoded as a P-bit spread spectrum code sequence, where P is a positive integer.

[0054] In some embodiments, each bit of data is encoded as a 31-bit spreading code sequence.

[0055] In some embodiments, the uplink signal is encoded using direct sequence spread spectrum and a pseudo-random noise code corresponding to a current image refresh period of the touch display device.

[0056] In some embodiments, the touch signal of the active object includes pressure information for indicating the touch pressure of the active object on the touch display device, the pressure information includes multi-bit pressure information encoding, and sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving pressure information encoding of different bits in the multi-bit pressure information encoding via the touch sensor during at least two second touch time periods among the multiple second touch time periods.

[0057] In some embodiments, the image refresh cycle includes eight second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the pressure information includes twelve-bit pressure information encoding, and the receiving of different bits of pressure information encoding in the multi-bit pressure information encoding via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the twelve-bit pressure information encoding via the touch sensor during six of the eight second touch periods, and receiving two bits of pressure information encoding in the twelve-bit pressure information encoding via the touch sensor during each of the six second touch periods.

[0058] In some embodiments, the image refresh cycle includes six second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the pressure information includes twelve-bit pressure information encoding, and the receiving of different bits of pressure information encoding in the multi-bit pressure information encoding via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the twelve-bit pressure information encoding via the touch sensor during two of the six second touch periods, and receiving six bits of pressure information encoding in the twelve-bit pressure information encoding via the touch sensor during each of the two second touch periods.

[0059] In some embodiments, the active object includes a power supply, the touch signal of the active object includes power information for indicating the state of the power supply, the power information includes a multi-bit power information code, and sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving different bits of power information code in the multi-bit power information code via the touch sensor during at least two second touch time periods among the multiple second touch time periods or during one second touch time period among the multiple second touch time periods.

[0060] In some embodiments, the image refresh cycle includes eight second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the power information includes a four-bit power information code, and receiving the power information code of different bits in the multi-bit power information code via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the four-bit power information code via the touch sensor during four second touch periods among the eight second touch periods.

[0061] In some embodiments, the image refresh cycle includes six second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the power information includes eight-bit power information code, and receiving power information codes of different bits in the multi-bit power information code via the touch sensor during one second touch period among the multiple second touch time periods includes: receiving the eight-bit power information code via the touch sensor during one second touch period among the six second touch time periods.

[0062] In some embodiments, the active object includes multiple keys, the touch signal of the active object includes key information for indicating the status of the multiple keys, the key information includes multi-bit key information codes corresponding to the multiple keys, and the touch signal of the active object is sensed via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device, including: receiving key information codes of different bits in the multi-bit key information code via the touch sensor during at least two second touch time periods among the multiple second touch time periods or during one second touch time period among the multiple second touch time periods.

[0063] In some embodiments, the touch signal of the active object includes inclination information for indicating the inclination angle of the active object relative to the touch display device, and the inclination information includes multi-bit inclination information encoding. Sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving different bits of inclination information encoding in the multi-bit inclination information encoding via the touch sensor during at least two second touch time periods among the multiple second touch time periods.

[0064] In some embodiments, the image refresh cycle includes eight second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the tilt information includes a six-bit tilt information code, and receiving the tilt information code of different bits in the multi-bit tilt information code via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the six-bit tilt information code via the touch sensor during six second touch periods among the eight second touch periods.

[0065] In some embodiments, the image refresh cycle includes six second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the tilt information includes a ten-bit tilt information code, and receiving the tilt information codes of different bits in the multi-bit tilt information code via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the ten-bit tilt information code via the touch sensor during five second touch periods among the six second touch periods, and receiving the two-bit tilt information codes in the ten-bit tilt information code via the touch sensor during each second touch period among the five second touch periods.

[0066] In some embodiments, the image refresh cycle includes six second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods, the tilt information includes eight-bit tilt information code, and receiving the tilt information code of different bits in the multi-bit tilt information code via the touch sensor during at least two second touch periods among the multiple second touch periods includes: receiving the eight-bit tilt information code via the touch sensor during four second touch periods among the six second touch periods, and receiving two bits of the tilt information code in the eight-bit tilt information code via the touch sensor during each second touch period among the four second touch periods.

[0067] In some embodiments, the touch signal of the active object includes hover information for indicating that the active object is in a hovering state, and identification information for indicating an identification of the active object, the hover information includes a hover information code, and the identification information includes an identification information code. Sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving the hover information code and the identification information code via the touch sensor during different second touch time periods or the same second touch time period among the multiple second touch time periods.

[0068] In some embodiments, the touch signal of the active object includes a multi-bit touch signal code, and the multi-bit touch signal code includes at least one of a multi-bit pressure information code, a multi-bit power information code, a multi-bit button information code, a multi-bit tilt information code, a hover information code, an identification information code and a check bit code. The sensing of the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: during each second touch time period, receiving three to ten touch signal codes from the multi-bit touch signal code via the touch sensor.

[0069] In some embodiments, each touch signal code in the multi-bit touch signal code includes a multi-bit pulse sequence, and the multi-bit pulse sequences in touch signal codes of different bits in the multi-bit touch signal code have different phases.

[0070] In some embodiments, the touch signal of the active object is encoded based on a binary phase shift keying (BPSK) format or a quadrature phase shift keying (QPSK) format.

[0071] According to a third aspect of the present disclosure, a touch processor is provided, comprising: a memory configured to store computer-executable instructions; and a data processor configured to execute the interaction method as described in any of the aforementioned method embodiments when the computer-executable instructions are executed by the data processor.

[0072] According to a fourth aspect of the present disclosure, a computer-readable storage medium is provided, which stores computer-executable instructions. When the computer-executable instructions are executed, the interactive method described in any one of the aforementioned method embodiments is executed.

[0073] According to a fifth aspect of the present disclosure, a touch display device is provided, comprising a touch sensor and a touch processor, wherein the touch processor is configured to execute the interaction method as described in any one of the aforementioned method embodiments.

[0074] According to a sixth aspect of the present disclosure, a touch system is provided, comprising the touch display device as described in the aforementioned embodiment and an active object, wherein the active object is configured to send a downlink signal to the touch display device in response to receiving the uplink signal, and the active object comprises an active pen.

[0075] In some embodiments, the active object is further configured to determine a current image refresh cycle of the touch display device based on the uplink signal, and send a downlink signal corresponding to the current image refresh cycle to the touch display device.

[0076] According to a seventh aspect of the present disclosure, a computer program product is provided, comprising a computer program, wherein when the computer program is executed by a processor, the computer program implements the interaction method as described in any one of the aforementioned method embodiments.

[0077] These and other advantages of the application will be apparent from and elucidated with reference to the embodiments described hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Embodiments of the present disclosure will now be described in more detail and with reference to the accompanying drawings.

[0079] FIG1 is a schematic diagram showing a touch display device touched by an external object;

[0080] FIG2 shows a block diagram of a touch sensor and a touch processor in a touch display device according to an embodiment of the present disclosure;

[0081] FIG3 shows a schematic diagram of signal interaction between a touch display device and an active object according to an embodiment of the present disclosure;

[0082] FIG4 shows a flow chart of a method for interaction between an external object and a touch display device according to an embodiment of the present disclosure;

[0083] 5 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period in a touch display device when an active object is sensed according to an embodiment of the present disclosure;

[0084] FIG6 shows a flow chart of a method for interaction between an external object and a touch display device according to another embodiment of the present disclosure;

[0085] 7 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period of a touch display device in a case where no active object is sensed according to an embodiment of the present disclosure;

[0086] 8 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period in a touch display device in a case where an active object is sensed according to another embodiment of the present disclosure;

[0087] 9 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period of a touch display device in a case where no active object is sensed according to another embodiment of the present disclosure;

[0088] 10 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0089] 11 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period of a touch display device in a case where no active object is sensed according to yet another embodiment of the present disclosure;

[0090] 12 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period in a touch display device according to another embodiment of the present disclosure when an active object is sensed;

[0091] 13 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period of a touch display device in a case where no active object is sensed according to another embodiment of the present disclosure;

[0092] 14 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle period of a touch display device according to another embodiment of the present disclosure when no active object is sensed;

[0093] 15 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0094] 16 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0095] 17 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0096] 18 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0097] 19 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0098] 20 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when a touch display device senses an active object according to yet another embodiment of the present disclosure;

[0099] 21 is a schematic diagram showing a timing sequence of a display driving period and a non-display driving period within a single image refresh cycle when an active object is sensed by a touch display device according to yet another embodiment of the present disclosure;

[0100] FIG22 shows a circuit diagram for modulating and demodulating an uplink signal sent by a touch display device to an active object using direct sequence spread spectrum according to an embodiment of the present disclosure;

[0101] FIG23 shows a schematic diagram of signal encoding of an uplink signal sent by a touch display device to an active object according to an embodiment of the present disclosure;

[0102] FIG24 is a schematic diagram showing a pulse sequence encoding three touch signals received via the touch sensor during each second touch control period according to one embodiment of the present disclosure;

[0103] FIG25 shows a schematic diagram of a BPSK data theoretical model according to an embodiment of the present disclosure;

[0104] FIG26 shows a schematic diagram of a DQPSK data theoretical model according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0105] The following description provides specific details of various embodiments of the present disclosure so that those skilled in the art can fully understand and implement the various embodiments of the present disclosure. In some cases, the present disclosure does not show or describe in detail some structures or functions well known in the art to avoid these unnecessary descriptions from obscuring the description of the embodiments of the present disclosure. The technical solutions of this patent application can be embodied in many different forms and purposes and should not be limited to the embodiments described herein. These embodiments are provided to make the technical solutions of the present disclosure clear and complete, but the embodiments do not limit the scope of protection of this patent application.

[0106] In the following description of the present disclosure, when the detailed description of the known functions and configurations contained herein may make the subject of the present disclosure vague rather than clear, these detailed descriptions will be omitted. In addition, the terms such as first, second, etc. mentioned herein are only used to distinguish the corresponding elements from other elements, and the essence, order, sequence or number of the corresponding elements of the corresponding elements are not limited by these terms. When describing that a certain element is "connected to" or "linked to" another element, it should be understood that the element can not only be directly "connected to" or "linked to" another element, but also "connected to" or "linked to" another element through a third element, or the third element can also be between the certain element and the other element.

[0107] Embodiments of the present disclosure provide a method for interacting with an external object and a touch-sensitive display device. A "touch-sensitive display device" as referred to herein refers to an electronic device with touch and image display capabilities, where a user can control the device by touching one or more locations on the display screen. Examples of touch-sensitive display devices include, but are not limited to, liquid crystal displays, organic light-emitting diode displays, and plasma displays.

[0108] The "external objects" mentioned in this article are relative to the "touch display device", that is, the external objects do not belong to the touch display device. External objects refer to objects that can touch the screen of the touch display device and can be recognized by the touch display device when the touch display device is running. External objects include the user's fingers or other body parts, and may also include other touch tools that can be recognized by the touch display device. Examples of touch tools include but are not limited to styluses, handwriting pens, active pens, styluses, touch sticks, etc. In the embodiments of the present disclosure, external objects are divided into active objects and passive objects. Active objects refer to touch tools that can receive and send signals. Active objects usually carry their own power supply elements, such as batteries. Examples of active objects include but are not limited to active pens. Passive objects include touch tools that do not have signal receiving and sending functions. Examples of passive objects include but are not limited to styluses, touch sticks, etc. that do not have signal receiving and sending functions. In this article, the user's fingers or other body parts that can touch the touch display device are also classified as passive objects.

[0109] Figure 1 shows a schematic diagram of an external object touching a touch display device. The external object and the touch display device constitute a touch system. As shown in Figure 1, both an active pen 20 and a user's finger can perform touch operations on the display screen of the touch display device 10 to achieve the user's desired operation on the touch display device.

[0110] In some embodiments, a touch display device may include a touch sensor. When an external object touches the touch display device, it may cause a change in the electrical signal on the touch sensor. The touch display device may determine whether the external object has touched the touch display device and the specific touch location based on the change in the electrical signal on the touch sensor. For example, the touch display device may detect the touch of an external object based on the mutual capacitance touch sensing principle or the self-capacitance touch sensing principle. Figure 2 shows a touch sensor in a touch display device based on the self-capacitance touch sensing principle and a block diagram of the touch sensor. As shown in Figure 2, the touch sensor may include a plurality of touch electrodes 110. These touch electrodes 110 may form a touch electrode array, and the layer structure in which the touch electrodes are located may be referred to as a touch electrode layer. Figure 2 also shows a touch processor 130, which is electrically connected to the plurality of touch electrodes 110 in the touch sensor via a plurality of signal lines 120. The touch processor 130 may apply a touch drive signal to each touch electrode 110 and may receive a touch sensing signal from the touch electrode 110. When an external object touches the touch display device, the electrical signal on at least a portion of the touch electrodes (for example, the touch electrodes corresponding to the touch position of the external object on the screen of the touch display device) may change. For example, the capacitance value of the self-capacitance of the above-mentioned at least a portion of the touch electrodes may change due to the touch of the external object. The touch processor 130 receives a touch sensing signal indicating the change in the capacitance value via the signal line 120, and accordingly determines that a touch event of the external object on the touch display device has occurred and determines the specific touch position. In other embodiments, the touch display device may also detect the touch of an external object based on the mutual capacitance touch sensing principle. In this case, the touch sensor may include multiple touch drive electrodes and multiple touch sensing electrodes, and the touch processor 130 may detect the touch of the external object based on the change in the mutual capacitance between the touch drive electrodes and the touch sensing electrodes. In other words, the touch sensor in the touch display device based on the self-capacitance touch sensing principle shown in Figure 2 does not constitute a limitation on the interaction method between an external object and a touch display device proposed in the embodiment of the present disclosure. In other words, the interaction method between an external object and a touch display device proposed in the embodiment of the present disclosure may also be applicable to touch display devices based on the mutual capacitance touch sensing principle.

[0111] A touch display device includes a display panel with an image function. The touch sensor mentioned above can be fabricated outside the display panel. In some embodiments, a touch panel including a touch sensor and a touch processor can be fabricated, and the touch panel and display panel are combined to form a touch display device. In other embodiments, the touch sensor can also be fabricated inside the display panel, that is, the touch sensor is embedded in the display panel. When the touch sensor is embedded in the display panel, the touch sensor can be formed together with the electrodes or signal lines related to display driving in the display panel during the manufacture of the display panel. For example, if the touch display device is implemented as a liquid crystal display, the common electrodes in the liquid crystal display can be fabricated into multiple common electrode blocks and reused as touch sensors. The common electrodes perform different functions in different time periods. For example, during the time period when the touch display device is driven to display an image, a common voltage can be applied to each common electrode block, while during the time period when the touch display device is detected by an external object, a touch drive signal can be applied to the common electrode block, or a touch sensing signal can be received from the common electrode block. In the case where the touch display device is implemented as an organic light emitting diode display, the touch sensor may be formed on a surface of the organic light emitting diode display panel, for example, on an encapsulation layer of the organic light emitting diode display panel.

[0112] Figure 3 shows a schematic diagram of signal interaction between the touch processor 130 and the active object (active stylus 20) in a touch display device. As shown in Figure 3, the touch processor 130 can send signals to the active stylus 20 or receive signals from the active stylus 20 via the touch sensor 120. The paths for the touch processor 130 to send and receive signals from the active stylus 20 are indicated as L1 and L2, respectively, in Figure 3. Signals transmitted from the touch processor 130 to the active object 20 via the touch sensor 120 are referred to herein as uplink signals, and signals transmitted from the active object 20 to the touch processor 130 via the touch sensor 120 are referred to herein as downlink signals.

[0113] The touch processor 130 can be implemented as a single or multiple integrated circuit chips. According to one embodiment of the present disclosure, the touch processor includes a sensor driver and a touch controller. The sensor driver is electrically connected to the touch sensor to sense changes in electrical signals on the touch sensor (for example, the capacitance value of the self-capacitance), so as to determine whether an external object touches the touch display device. The touch controller is electrically connected to the sensor driver and can receive downlink signals sent by the active object. The touch controller further determines the touch state related to the external object based on the changes in electrical signals on the touch sensor sensed by the sensor driver or based on the downlink signals sent by the active object, for example, the touch position, pressure (Pressure), tilt (Tilt), battery power (Power), etc. of the external object. In Figures 2 and 3, the touch processor 130 is illustrated as a single integrated circuit chip. In other embodiments, different functional modules in the touch processor 130 can be implemented as independent integrated circuit chips respectively. For example, the sensor driver and the touch controller can be implemented as different integrated circuit chips respectively.

[0114] Below, the interaction method between an external object and a touch display device proposed in an embodiment of the present disclosure is described with reference to FIG4. As shown in FIG4, the above method includes: S410, an image refresh cycle of the touch display device includes multiple display drive periods and multiple non-display drive periods, the display drive periods and the non-display drive periods alternating with each other, the multiple non-display drive periods include multiple first touch periods and multiple second touch periods, each first touch period or each second touch period is a non-display drive period, and the image refresh cycle includes at least two second touch periods located between at least two first touch periods; and S420, the external object includes an active object or a passive object, the touch display device receives a communication signal from the active object, senses a touch signal of the passive object via the touch sensor during the multiple first touch periods to detect the touch of the passive object on the touch display device, and senses a touch signal of the active object via the touch sensor during the multiple second touch periods to detect the touch of the active object on the touch display device. The image refresh cycle mentioned here refers to the time period in which the touch display device displays a frame of image. The image refresh period corresponds to the image refresh frequency. For example, if the image refresh frequencies of the touch display device are 60 Hz, 90 Hz, 120 Hz, and 144 Hz, respectively, the image refresh periods are 1 / 60 second, 1 / 90 second, 1 / 120 second, and 1 / 144 second, respectively. Furthermore, the statement in step S410 above that "an image refresh period includes at least two second touch periods located between at least two first touch periods" does not limit the specific arrangement of the at least two second touch periods between the at least two first touch periods. In some embodiments, an image refresh period may include at least two second touch periods located between a group of two adjacent first touch periods, for example, two second touch periods located between a group of two adjacent first touch periods; or an image refresh period may include at least two second touch periods located between two groups of two adjacent first touch periods, for example, one second touch period located between a group of two adjacent first touch periods, and another second touch period located between another group of two adjacent first touch periods. This will be further described below by way of example.

[0115] The interaction method between an external object and a touch display device proposed in the above-mentioned embodiments of the present disclosure can be executed periodically with the image refresh cycle of the touch display device. Figure 5 shows a schematic diagram of the timing of the display drive period and the non-display drive period (including the first touch period and the second touch period) within a single image refresh cycle Tf time period when the touch display device senses an active object. In some embodiments, the touch display device can send an uplink signal to the external object to establish a connection between the external object and the touch display device. In Figure 5, the time period in which the touch display device sends the uplink signal to the external object is identified as B, and the image refresh cycle Tf can also be understood as the sending period in which the touch display device sends the uplink signal to the external object.

[0116] As shown in Figure 5, the touch display device sends an uplink signal to an external object during time period B. If the touch display device receives a communication signal from the external object, such as an ACK (acknowledgement character) signal, this indicates that the touch display device has discovered an active object (e.g., an active pen) and established a connection with the active object. The period during which the touch display device displays a frame of image (i.e., an image refresh cycle) includes multiple display drive periods D and multiple non-display drive periods. The display drive periods D and the non-display drive periods alternate with each other. The multiple non-display drive periods may include multiple first touch periods T3, T6, T10, T13 and multiple second touch periods T1, T2, T4, T5, T8, T9, T11, T12. Each of the first touch periods or each of the second touch periods is a non-display drive period. As shown in Figure 5, a single image refresh cycle includes at least two second touch periods (e.g., second touch periods T4, T5) located between a group of two adjacent first touch periods (e.g., first touch periods T3, T6). In this example, only a display drive period D exists between the at least two second touch periods (e.g., second touch periods T4 and T5). During each display drive period D, each pixel of the touch display device displays an image under the drive of the pixel drive circuit and gate scan circuit of the touch display device. During the multiple first touch periods T3, T6, T10, and T13, a touch signal of a passive object is sensed via the touch sensor to detect the touch of the touch display device by the passive object. If a passive object (e.g., a user's finger) touches the touch display device, the passive object will affect the electrical signal on the touch sensor. For example, the charge on the touch electrode changes, causing the self-capacitance of the touch electrode to change. The change in the electrical signal on the touch sensor can be regarded as a touch signal of the passive object. The touch processor can collect the touch signal to detect the touch of the passive object on the touch display device, for example, to determine the touch position of the passive object. If no passive object touches the touch display device, the electrical signal on the touch sensor does not change during the first touch periods T3, T6, T10, and T13, and the touch processor determines that no passive object is detected. That is, during the time period Tf for displaying each frame of an image, the touch processor of the touch display device detects a touch of the touch display device by a passive object during the first touch periods T3, T6, T10, and T13. During the plurality of second touch periods T1, T2, T4, T5, T8, T9, T11, and T12, the touch display device senses a touch signal of an active object via the touch sensor to detect a touch of the touch display device by the active object.If an active object (e.g., an active pen) touches a touch display device, the active object will cause changes in the electrical signal on the touch sensor. The active object can also send a downlink signal to the touch display device. The touch processor receives the downlink signal via the touch sensor and can then determine not only the touch position of the active object but also other touch states related to the active object, such as touch pressure and the posture of the active object. It should be noted that the touch of the touch display device by a passive or active object can be direct contact or indirect contact by hovering within a distance where the touch display device can detect the passive or active object. This disclosure does not limit the specific contact form.

[0117] By arranging the display drive period, the first touch period and the second touch period in such a timing during the image refresh cycle, compared with the interaction method between the external object and the touch display device based on the conventional communication protocol between the external object and the touch display device, the proportion of the total time length of the first touch period and the second touch period in the image refresh cycle can be reduced without affecting the detection of touch on active objects and passive objects, so that each image refresh cycle includes a longer display drive period, which is very beneficial for further improving the image display quality of the touch display device. For example, it can support the implementation of touch display devices with higher image refresh rates and higher PPI (pixels per inch).

[0118] In some embodiments, at least one second touch period exists between every two adjacent first touch periods in an image refresh cycle. As shown in Figure 5 , between every two adjacent first touch periods among the first touch periods T3, T6, T10, and T13, two second touch periods from among the second touch periods T1, T2, T4, T5, T8, T9, T11, and T12 exist. For example, between first touch periods T3 and T6, there are second touch periods T4 and T5; between first touch periods T6 and T10, there are second touch periods T8 and T9; and between first touch periods T10 and T13, there are second touch periods T11 and T12. In the embodiment shown in Figure 5 , the image refresh cycle Tf includes eight second touch periods and four first touch periods, with two second touch periods between every two adjacent first touch periods. The image refresh cycle Tf also includes thirteen display drive periods D. The image refresh frequency of the touch display device can be 60 Hz or 90 Hz, in which case the image refresh period Tf shown in Figure 5 is 1 / 60 second or 1 / 90 second, respectively. Even if an active object such as an active pen and a user's finger touch the touch display device simultaneously, the touch display device can detect touches of both the active pen and the finger on the touch display device during each image refresh period Tf.

[0119] The touch signals of passive objects and active objects mentioned here and in the following description may contain different information content. A touch signal of a passive object includes changes in the electrical signal on the touch sensor caused by the passive object touching the touch display device. A touch signal of an active object includes not only changes in the electrical signal on the touch sensor caused by the active object touching the touch display device, but also downlink signals transmitted by the active object to the touch display device.

[0120] According to another embodiment of the present disclosure, as shown in FIG6 , the method for interaction between an external object and a touch display device further includes: S630, if the touch display device does not receive a communication signal from the active object, then during the multiple second touch time periods, the touch signal of the passive object is sensed via the touch sensor to detect the touch of the passive object on the touch display device. Steps S610 and S620 shown in FIG6 are the same as steps S410 and S420 shown in FIG4 , and are not repeated here. If the touch display device does not receive a communication signal from the active object, then during the multiple first touch time periods, although both the active object and the passive object can touch the touch display device, the touch of the active object and the passive object on the touch display device is not detected. 7 , when the touch display device does not receive a communication signal from an external object, the touch display device determines that there is no active object nearby. During the second touch periods T1, T2, T4, T5, T8, T9, T11, and T12, the touch sensor senses a touch signal from a passive object to detect the touch of the touch display device by the passive object. If a passive object (e.g., a user's finger) touches the touch display device, the electrical signal on the touch sensor changes, thereby obtaining a touch signal from the passive object. The touch processor detects the touch of the touch display device by the passive object based on the touch signal. If no passive object touches the touch display device, the electrical signal on the touch sensor does not change during the second touch periods T1, T2, T4, T5, T8, T9, T11, and T12, and the touch display device determines that no passive object has been detected. That is, in this embodiment, if the touch display device determines that there is no active object nearby, it detects whether a passive object has touched the touch display device during each of the second touch periods. During the first touch periods T3, T6, T10 and T13 shown in FIG. 7 , the touch display device does not detect touches of external objects (including active objects and passive objects), thereby reducing the load of the touch processor and lowering the power consumption of the touch display device.

[0121] In other embodiments, when the touch display device does not receive a communication signal from the active object, at least a portion of the multiple first touch time periods T3, T6, T10 and T13 can be used as noise processing periods. At this time, the interaction method between the external object and the touch display device also includes: obtaining the signal-to-noise ratio of at least one of the touch signal of the active object or the touch signal of the passive object during the noise processing period; and adjusting the frequency of collecting the touch signal of the active object or the passive object in response to the signal-to-noise ratio being lower than a threshold.

[0122] FIG8 is a schematic diagram illustrating the timing of the display drive period, the first touch period, and the second touch period within a single image refresh cycle Tf of a touch display device according to another embodiment of the present disclosure. As shown in FIG8 , the image refresh cycle Tf includes thirteen display drive periods D for image display, eight second touch periods (T2, T3, T5, T6, T8, T9, T11, and T12), and four first touch periods (T1, T4, T10, and T13). An image refresh cycle Tf includes at least two second touch periods (e.g., T5, T6, T8, and T9) located between a set of two adjacent first touch periods (e.g., T4 and T10). There are two second touch periods T2 and T3 between adjacent first touch periods T1 and T4; four second touch periods T5, T6, T8, and T9 between adjacent first touch periods T4 and T10; and two second touch periods T11 and T12 between adjacent first touch periods T10 and T13. In the embodiment shown in FIG8 , the touch display device transmits an uplink signal to an external object during time period B. If the touch display device receives a communication signal from the external object, it indicates that the touch display device has sensed the presence of an active object. During the second touch time periods T2, T3, T5, T6, T8, T9, T11, and T12, the touch sensor senses a touch signal from the active object to detect a touch of the touch display device by the active object. During the first touch time periods T1, T4, T10, and T13, the touch sensor senses a touch signal from a passive object to detect a touch of the touch display device by the passive object. As shown in FIG9 , if the touch display device does not receive a communication signal from the external object, it indicates that the touch display device has not sensed an active object. During the second touch time periods T2, T3, T5, T6, T8, T9, T11, and T12, the touch sensor senses a touch signal from the passive object to detect a touch of the touch display device by the passive object. During the first touch periods T1 , T4 , T10 and T13 , the touch display device does not detect a touch of an external object.

[0123] Figure 10 shows a schematic diagram of the timing of the display drive period, the first touch period, and the second touch period within a single image refresh cycle Tf of a touch display device according to another embodiment of the present disclosure. In this embodiment, the image refresh cycle Tf includes four second touch periods T2, T4, T7, and T9 and four first touch periods T1, T3, T6, and T8. One image refresh cycle Tf includes at least two second touch periods, each located between two groups of two adjacent first touch periods. In this example, the at least two second touch periods also include additional first touch periods. For example, the second touch period T2 is located between two adjacent first touch periods T1 and T3, the second touch period T4 is located between two adjacent first touch periods T3 and T6, and the second touch period T7 is located between two adjacent first touch periods T6 and T8. Moreover, there is a second touch period between each two adjacent first touch periods in the four first touch periods. For example, a second touch period T2 exists between first touch periods T1 and T3, a second touch period T4 exists between first touch periods T3 and T6, and a second touch period T7 exists between first touch periods T6 and T8. In the embodiment of FIG10 , the image refresh rate of the touch display device is 90 Hz or higher. During time period B, the touch display device transmits an uplink signal to an external object. If the touch display device receives a communication signal from the external object, it indicates that the touch display device has sensed the presence of an active object. During the second touch periods T2, T4, T7, and T9, the touch sensor senses a touch signal from an active object to detect a touch of the touch display device by the active object. During the first touch periods T1, T3, T6, and T8, the touch sensor senses a touch signal from an inactive object to detect a touch of the touch display device by the inactive object. As shown in FIG11 , if the touch display device does not receive a communication signal from an external object, it indicates that the touch display device has not sensed an active object. During the second touch periods T2 , T4 , T7 , and T9 and the first touch periods T1 , T3 , T6 , and T8 , a touch signal of a passive object is received via the touch sensor to sense the touch of the passive object on the touch display device.

[0124] In some embodiments, detecting a touch of the touch display device by the passive object and detecting a touch of the touch display device by the active object include respectively collecting a touch signal of the passive object sensed by the touch sensor and collecting a touch signal of the active object sensed by the touch sensor. For example, the touch processor may collect changes in the electrical signal on the touch sensor and a downlink signal transmitted by the active object. The plurality of non-display driving periods also include a noise processing period. In this case, the method for interacting with the touch display device further includes the following steps: obtaining a signal-to-noise ratio of at least one of the touch signal of the active object or the touch signal of the passive object during the noise processing period; and adjusting the frequency of collecting the touch signal of the active object or the touch signal of the passive object in response to the signal-to-noise ratio being lower than a threshold. Referring back to Figures 5 and 7 to 9, during each image refresh period Tf, the plurality of non-display driving periods also include a noise processing period T7. During the noise processing period T7, a controller (e.g., a touch processor) in the touch display device may calculate the signal-to-noise ratio of at least one of the touch signal of the active object or the touch signal of the passive object. The touch signal of the active object or the touch signal of the passive object may contain an interference signal, and the interference signal may originate from the touch display device itself or the surrounding environment. If the signal-to-noise ratio of the touch signal of the active object or the touch signal of the passive object is lower than a threshold value, the frequency of collecting the touch signal of the active object or the frequency of collecting the touch signal of the passive object is adjusted. In some embodiments, the frequency of collecting the touch signal of the active object or the passive object (which may be simply referred to as the sampling frequency) is between 200KHz and 400KHz. When the signal-to-noise ratio of the touch signal of the active object or the touch signal of the passive object is lower than a threshold value, the frequency of collecting the touch signal of the active object or the passive object is adjusted so that the sampling frequency avoids the frequency of the interference signal, thereby reducing the influence of the interference signal on the detection of the touch of the touch display device by the external object.

[0125] In Figures 10 and 11 , the noise processing period is identified as T5. In other embodiments, if the signal-to-noise ratio of the touch signal of the active object or the touch signal of the passive object is lower than a threshold, the frequency at which the active object transmits the downlink signal to the touch display device may be adjusted, thereby further reducing the impact of interference signals on the detection of touch by an external object on the touch display device.

[0126] In some embodiments, a time length of each first touch period in the plurality of first touch periods and a time length of each second touch period in the plurality of second touch periods do not exceed a first threshold.

[0127] It is understood that the frequency of the downlink signal is generally between 100KHz and 400KHz, and this frequency can be adjusted according to specific circumstances. Each second touch period needs to complete the transmission of 41 to 91 square wave signals with a frequency of 100KHz to 400KHz, and the duration thereof does not exceed a first threshold value. This first threshold value can be determined based on the performance of the screen of the touch display device to avoid abnormal display on the screen. In some embodiments, the maximum value of the first threshold value is 180 microseconds, for example, it can be 140 microseconds, 180 microseconds, etc.

[0128] In some embodiments, each first touch period and each second touch period can have the same duration. Referring to Figures 5 and 7 , the first touch periods T3, T6, T10, and T13 and the second touch periods T1, T2, T4, T5, T8, T9, T11, and T12 have the same duration. In Figures 8 and 9 , the eight second touch periods T2, T3, T5, T6, T8, T9, T11, and T12 and the four first touch periods T1, T4, T10, and T13 also have the same duration. In some embodiments, the noise processing period T7 does not exceed a second threshold, which can meet the time required for noise detection. For example, the noise processing period T7 does not exceed 180 microseconds. In other embodiments, the noise processing period T7 has the same duration as each first touch period or second touch period. For the embodiments of FIG. 10 and FIG. 11 , the second touch periods T2 , T4 , T7 , and T9 , the first touch periods T1 , T3 , T6 , and T8 , and the noise processing period T5 may have the same length of time.

[0129] In some embodiments, the plurality of first touch periods and the plurality of second touch periods are distributed symmetrically on both sides of the noise processing period. That is, the number of the first touch periods and the second touch periods on both sides of the noise processing period is equal. This means that during each image refresh cycle or the time period during which each frame of an image is displayed, the total duration of the first touch periods and the second touch periods on both sides of the noise processing period is the same. If each first touch period and each second touch period has the same duration, the total number of first touch periods and second touch periods on both sides of the noise processing period is the same. For example, as shown in Figure 5, the second touch periods T1, T2, T4, and T5, the first touch periods T3, T6, the second touch periods T8, T9, T11, and T12, and the first touch periods T10 and T13 are symmetrically distributed on both sides of the noise processing period T7. Before the noise processing period T7, there are six time periods: the second touch periods T1, T2, T4, and T5, and the first touch periods T3 and T6. After the noise processing period T7, there are also six time periods: the second touch periods T8, T9, T11, and T12, and the first touch periods T10 and T13. Similarly, as shown in Figure 10, the first touch periods T1, T3, T6, and T8, and the second touch periods T2, T4, T7, and T9 are symmetrically distributed on both sides of the noise processing period T5. However, the technical solutions of the present disclosure are not limited thereto. In other embodiments, the noise processing period may be temporally swapped with any first touch period or any second touch period. In this case, the multiple first touch periods and the multiple second touch periods are distributed on both sides of the noise processing period in an asymmetric manner. In other embodiments, the duration of the noise processing period may be different from the duration of the first touch period or the second touch period.

[0130] FIG12 shows a schematic diagram of the timing of the display drive period and the non-display drive period within a single image refresh cycle time period of a touch display device according to another embodiment of the present disclosure when an active object is sensed. In the example of FIG12 , the image refresh cycle includes six second touch periods T2, T3, T5, T6, T8, and T9 and four first touch periods T1, T4, T7, and T10. An image refresh cycle Tf includes at least two second touch periods located between a group of two adjacent first touch periods (for example, first touch periods T1 and T4). There are two second touch periods between each two adjacent first touch periods in the four first touch periods T1, T4, T7, and T10. An image refresh cycle also includes ten display drive periods D. The image refresh frequency of the touch display device can be 120 Hz, in which case the image refresh cycle Tf shown in FIG12 is 1 / 120 second. In the example of Figure 12, the touch display device sends an uplink signal to the external object during time period B. The sending period of the uplink signal is the image refresh period. The time period corresponding to the uplink signal (i.e., time period B) can include a noise processing period. That is, noise processing can be implemented in time period B to reduce the impact of interference signals on the detection of the touch of the touch display device by the external object.

[0131] FIG13 illustrates a schematic diagram of the timing of display drive periods and non-display drive periods within a single image refresh cycle of the touch display device of the embodiment shown in FIG12 , when no active object is sensed. As shown in FIG13 , when no active object is sensed by the touch display device, the touch display device does not detect touches by the active object and the passive object during two of the multiple non-display drive periods (e.g., T5 and T10). However, during the remaining non-display drive periods (e.g., during the second touch periods T2, T3, T6, T8, and T9 and the first touch periods T1, T4, and T7), the touch sensor receives touch signals from the passive object to sense the touch of the touch display device, thereby reducing the load on the touch processor and lowering the power consumption of the touch display device. In the example shown in FIG13 , the non-display drive period T5 can also be used for noise processing. In other embodiments, the touch display device can also sense the touch signal of the passive object via the touch sensor during all six second touch periods T2, T3, T5, T6, T8, T9 and four first touch periods T1, T4, T7 and T10 to detect the touch of the passive object on the touch display device.

[0132] As shown in FIG14 , when the touch display device does not sense an active object, the touch display device does not detect touches by the active object and the passive object on the touch display device during two non-display driving periods (e.g., T5 and T6) among the multiple non-display driving periods, while receiving touch signals from the passive object via the touch sensor during the other non-display driving periods (e.g., T1, T2, T3, T4, T7, T8, T9, and T10) to sense touches by the passive object on the touch display device. In the example of FIG14 , the non-display driving period does not include a noise processing period.

[0133] Figure 15 shows a schematic diagram of the timing of the display drive period and the non-display drive period within a single image refresh cycle of a touch display device according to another embodiment of the present disclosure when an active object is sensed. In this example, an image refresh cycle includes five second touch periods T1, T3, T5, T8, and T10 and four first touch periods T2, T4, T7, and T9. There is a second touch period between each two adjacent first touch periods in the four first touch periods T2, T4, T7, and T9. An image refresh cycle Tf includes at least two second touch periods, each located between two groups of adjacent first touch periods. For example, second touch period T3 is located between two adjacent first touch periods T2 and T4; second touch period T5 is located between two adjacent first touch periods T4 and T7; and second touch period T8 is located between two adjacent first touch periods T7 and T9. In Figure 15, the noise processing period is identified as T6.

[0134] In some embodiments, there is no second touch period between at least one set of two adjacent first touch periods in an image refresh cycle. That is, there may be no second touch period between at least one set of two adjacent first touch periods in an image refresh cycle, or there may be no second touch period between multiple sets of two adjacent first touch periods.

[0135] During implementation, an image refresh cycle can include six second touch periods and four first touch periods. Among the four first touch periods, there are no second touch periods between two groups of adjacent first touch periods, and there are at least two second touch periods between one group of adjacent first touch periods. That is, in this case, there can be two, three, or more second touch periods between one group of adjacent first touch periods. Figure 16 shows a schematic diagram of the timing of display drive periods and non-display drive periods within a single image refresh cycle when a touch display device senses an active object according to another embodiment of the present disclosure. In this example, an image refresh cycle includes six second touch periods T1, T2, T3, T4, T7, and T8 and four first touch periods T5, T6, T9, and T10. Among the four first touch periods, there are no second touch periods between two groups of adjacent first touch periods, and there are two second touch periods between one group of adjacent first touch periods. For example, there is no second touch period between two adjacent first touch periods T5 and T6 and between two adjacent first touch periods T9 and T10, and there are two second touch periods T7 and T8 between two adjacent first touch periods T6 and T9.

[0136] During implementation, an image refresh cycle may also include six second touch periods and four first touch periods, wherein there is no second touch period between two adjacent first touch periods in one group of the four first touch periods, and there is at least one second touch period between two adjacent first touch periods in two groups. In other words, in this case, there are one, two, or more second touch periods between two adjacent first touch periods.

[0137] Figure 17 is a schematic diagram illustrating the timing of display drive periods and non-display drive periods within a single image refresh cycle of a touch display device according to yet another embodiment of the present disclosure, when an active object is sensed. In this example, an image refresh cycle includes six second touch periods T1, T2, T3, T4, T6, and T8, and four first touch periods T5, T7, T9, and T10. Among the four first touch periods, one set of two adjacent first touch periods does not have a second touch period between them, and two sets of two adjacent first touch periods each have a second touch period between them. For example, there is no second touch period between two adjacent first touch periods T9 and T10, and there is a second touch period T6 between two adjacent first touch periods T5 and T7, and there is a second touch period T8 between two adjacent first touch periods T7 and T9. The two adjacent first touch periods T5 and T7 are one group of two adjacent first touch periods, and the two adjacent first touch periods T7 and T9 are the other group of two adjacent first touch periods. The two adjacent first touch periods share the first touch period T7.

[0138] Figure 18 is a schematic diagram illustrating the timing of display drive periods and non-display drive periods within a single image refresh cycle of a touch display device according to yet another embodiment of the present disclosure, when an active object is sensed. In this example, an image refresh cycle includes six second touch periods T1, T2, T3, T4, T6, and T9, and four first touch periods T5, T7, T8, and T10. Among the four first touch periods, one set of two adjacent first touch periods does not have a second touch period between them, and two sets of two adjacent first touch periods each have a second touch period between them. For example, there is no second touch period between two adjacent first touch periods T7 and T8, and there is a second touch period T6 between two adjacent first touch periods T5 and T7, and there is a second touch period T9 between two adjacent first touch periods T8 and T10. The two adjacent first touch periods T5 and T7 are one group of two adjacent first touch periods, and the two adjacent first touch periods T8 and T10 are the other group of two adjacent first touch periods. There is no common first touch period between the two adjacent first touch periods.

[0139] Figure 19 is a schematic diagram illustrating the timing of display drive periods and non-display drive periods within a single image refresh cycle of a touch display device according to yet another embodiment of the present disclosure, when an active object is sensed. In this example, an image refresh cycle includes six second touch periods T1, T2, T4, T6, T9, and T10, and four first touch periods T3, T5, T7, and T8. Among the four first touch periods, one set of two adjacent first touch periods does not have a second touch period between them, and two sets of two adjacent first touch periods each have a second touch period between them. For example, there is no second touch period between two adjacent first touch periods T7 and T8, and there is a second touch period T4 between two adjacent first touch periods T3 and T5, and there is a second touch period T6 between two adjacent first touch periods T5 and T7. The two adjacent first touch periods T3 and T5 are one group of two adjacent first touch periods, and the two adjacent first touch periods T5 and T7 are the other group of two adjacent first touch periods. The two adjacent first touch periods share the first touch period T5.

[0140] Figure 20 is a schematic diagram illustrating the timing of display drive periods and non-display drive periods within a single image refresh cycle of a touch display device according to yet another embodiment of the present disclosure, when an active object is sensed. In this example, an image refresh cycle includes six second touch periods T1, T2, T5, T7, T9, and T10, and four first touch periods T3, T4, T6, and T8. Among the four first touch periods, one set of two adjacent first touch periods does not have a second touch period between them, and two sets of two adjacent first touch periods each have a second touch period between them. For example, there is no second touch period between two adjacent first touch periods T3 and T4, and there is a second touch period T5 between two adjacent first touch periods T4 and T6, and there is a second touch period T7 between two adjacent first touch periods T6 and T8. The two adjacent first touch periods T4 and T6 are one group of two adjacent first touch periods, and the two adjacent first touch periods T6 and T8 are the other group of two adjacent first touch periods. The two adjacent first touch periods share the first touch period T6.

[0141] Figure 21 is a schematic diagram illustrating the timing of display drive periods and non-display drive periods within a single image refresh cycle of a touch display device according to yet another embodiment of the present disclosure, when an active object is sensed. In this example, an image refresh cycle includes six second touch periods T1, T2, T4, T7, T9, and T10, and four first touch periods T3, T5, T6, and T8. Among the four first touch periods, one set of two adjacent first touch periods does not have a second touch period between them, and two sets of two adjacent first touch periods each have a second touch period between them. For example, there is no second touch period between two adjacent first touch periods T5 and T6, and there is a second touch period T4 between two adjacent first touch periods T3 and T5, and there is a second touch period T7 between two adjacent first touch periods T6 and T8. The two adjacent first touch periods T3 and T5 are one group of two adjacent first touch periods, and the two adjacent first touch periods T6 and T8 are the other group of two adjacent first touch periods. There is no common first touch period between the two adjacent first touch periods.

[0142] In some embodiments, the method for interacting an external object with a touch display device further includes: the touch display device sending an uplink signal to the external object, and periodically sending the uplink signal to the external object with the image refresh period of the touch display device as the sending period. For example, as shown in Figures 5 and 7 to 21, the touch display device sends an uplink signal to the external object during time period B, and the sending period of the uplink signal is the image refresh period Tf. The uplink signal may define the collaborative operation between the touch display device and the active object (e.g., an active pen) or include the control signal required for the driving operation of the active object. For example, the uplink signal may include identification information and type information of the touch display device, characteristic information of the downlink signal sent by the active object (e.g., frequency, number of pulses), and information for driving synchronization between the active object and the touch display device.

[0143] It should be noted that when the image refresh frequency of the touch display device switches between different frequencies (for example, 60 Hz, 90 Hz, 120 Hz and 144 Hz), the active object needs to be adjusted in real time to support the variable frequency display technology of the touch display device.

[0144] In some embodiments, the uplink signal includes a first character segment, and the first character segment is used to characterize the current image refresh cycle of the touch display device. During implementation, the first character segment can use the data string "00", "01", "10" and "11", which correspond to the current image refresh cycle of the touch display device being 60Hz, 90Hz, 120Hz and 144Hz. The active object responds to the received uplink signal, determines the current image refresh cycle of the touch display device according to the first character segment, and sends a downlink signal corresponding to the current image refresh cycle to the touch display device. For example, if it is determined that the current image refresh cycle of the touch display device is 60Hz or 90Hz, a downlink signal can be sent to the touch display device according to the transmission signal format in Table 1 or Table 2 below; if it is determined that the current image refresh cycle of the touch display device is 120Hz, a downlink signal can be sent to the touch display device according to the transmission signal format in Table 3 or Table 4 below.

[0145] In some embodiments, the uplink signal also includes a second character segment, which is used to represent the frequency at which the active object sends a downlink signal to the touch display device. During implementation, the frequency at which the active object sends a downlink signal to the touch display device is generally between 100KHz and 400KHz, such as 164.86KHz, 195.12KHz, and 285.7KHz. The second character segment can also use a data string to represent the frequency of the downlink signal. In response to the received uplink signal, the active object determines the frequency at which the downlink signal needs to be sent to the touch display device based on the second character segment, and sends the downlink signal to the touch display device at this frequency.

[0146] In some embodiments, the uplink signal includes 7 bits of data. The uplink signal can be encoded using direct sequence spread spectrum (DSSS), and each bit of data is encoded as a P-bit spread spectrum code sequence, where P is a positive integer. Direct Sequence Spread Spectrum (DSSS) technology encodes each bit of data into a multi-bit spread spectrum code sequence (the multi-bit spread spectrum code sequence can be called a "chip"). On the surface, the use of direct sequence spread spectrum technology requires a higher bandwidth, but the cost is worth it. In the implementation process, the uplink signal can be encoded using direct sequence spread spectrum and a pseudo-random noise code corresponding to the current image refresh period of the touch display device. Figure 22 shows a circuit schematic diagram of modulating and demodulating an uplink signal using direct sequence spread spectrum according to an embodiment of the present disclosure. As shown in Figure 22, the source data of the touch display device is defined to form an RS code, which is the 7-bit source code of the uplink signal. After modulation, the uplink signal is logically operated with a pseudo-random noise (PN) code to form a spread spectrum code sequence. The spread spectrum code sequence is transmitted through contact between the active object and the touch display device. The active object uses the PN code to demodulate the spread spectrum code sequence, and after RS ​​error correction, the source data is obtained. The PN code can correspond one-to-one with the image refresh cycle of the touch display device. For example, if there are four image refresh cycles, represented by the data strings "00," "01," "10," and "11," there are also four PN codes. Each PN code needs to be encoded with the corresponding data string to complete the modulation function. The PN code can be encoded using an 8-bit hexadecimal system, starting with 0X. The minimum value of each bit is 0 and the maximum value is F. The specific value of each bit in the PN code can be customized according to product performance and confidentiality requirements, and is not limited by the embodiments of the present disclosure. Taking the data string "01" corresponding to the PN code 0X11011001 as an example, after the exclusive OR logic operation, the data "0" is encoded with the code piece "11011101", and the data "1" is encoded with the code piece "00100010", so the data string "01" can be encoded as "1101110100100010".

[0147] In some embodiments, each bit of data is encoded as a 31-bit spread spectrum code sequence. For example, the uplink signal transmits 7 characters of "0" or "1", and each character is expanded into a 31-bit string of "0" or "1", that is, the uplink signal includes 7 bits of data, and each bit of data is encoded as a 31-bit spread spectrum code sequence, so that the uplink signal includes a total of 217 bits of spread spectrum code sequence. The uplink signal can also be described as including 7-bit code, each bit of code includes a 31-bit pulse sequence, that is, each bit of code is represented by a 31-bit pulse sequence, and the pulse potential of each bit in the 31-bit pulse sequence corresponds to "0" or "1". The codes of different bits in the 7-bit code may include different 31-bit pulse sequences. Figure 23 shows an example of 7-bit code in an uplink signal. Each bit of code in the 7-bit codes N0 to N6 includes a 31-bit pulse sequence, and accordingly, the uplink signal includes a 217-bit pulse sequence. In some embodiments, the duration of each bit pulse is 1 microsecond, and the duration Td of the pulse corresponding to each bit code is 31 microseconds. Some of the 7-bit codes are used to achieve signal synchronization between the touch display device and the active object. Other codes may represent identification information, type information, current image refresh cycle, and characteristic information (e.g., frequency, number of pulses) of the touch display device. Those skilled in the art may assign specific information content to each of the 7-bit codes based on actual applications, and this is not a specific limitation here.

[0148] After an active object and a touch display device establish a connection, the active object can transmit a downlink signal to the touch display device. The downlink signal is sensed by the touch sensor, and the touch display device can determine the touch status of the active object based on the downlink signal. The information content of the downlink signal can be set according to actual application needs. In some embodiments, the downlink signal may include the active object number, the key status of the active object, the touch pressure information of the active object, the tilt information of the active object, the power information of the active object, and information used for error detection and correction.

[0149] In some embodiments, the touch signal of the active object (for example, a downlink signal) includes pressure information for indicating the touch pressure of the active object on the touch display device, the pressure information includes multi-bit pressure information encoding, and sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving pressure information encoding of different bits in the multi-bit pressure information encoding via the touch sensor during at least two second touch time periods among the multiple second touch time periods.

[0150] For the embodiment described above in which the image refresh cycle includes eight second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods. In this case, the pressure information may include twelve bits of pressure information code, and receiving pressure information codes of different bits from the multi-bit pressure information code via the touch sensor during at least two second touch periods among the plurality of second touch periods includes: receiving the twelve bits of pressure information code via the touch sensor during six second touch periods among the eight second touch periods, and receiving two bits of pressure information code from the twelve bits of pressure information code via the touch sensor during each second touch period among the six second touch periods.

[0151] Tables 1 and 2 show two exemplary formats of downlink signals received by a touch display device. The following describes an example of receiving different pressure information encoding bits in the multi-bit pressure information encoding via a touch sensor in conjunction with Tables 1, 2 and FIG. 5 .

[0152] As shown in FIG5 , the image refresh cycle includes eight second touch periods T1, T2, T4, T5, T8, T9, T11, and T12. As shown in Tables 1 and 2, during the second touch periods T1, T2, T4, T8, T9, and T11, the touch sensor receives twelve bits of pressure information encoding "Pressure 0," "Pressure 1," ..., "Pressure 11." Furthermore, during each of the six second touch periods T1, T2, T4, T8, T9, and T11, the touch sensor receives two bits of pressure information encoding out of the twelve bits of pressure information encoding. For example, during the second touch period T11, the touch display device receives "Pressure 0" and "Pressure 1" from an active object (e.g., an active stylus) via the touch sensor. During the second touch period T9, the touch display device receives "Pressure 2" and "Pressure 3" from the active object (e.g., an active stylus) via the touch sensor. During the second touch period T1, the touch display device receives "Pressure 10" and "Pressure 11" from the active object (e.g., an active stylus) via the touch sensor. Thus, touch pressure information represented by the 12-bit pressure information encoding is received by the touch display device in a time-dispersed manner. This facilitates compatibility of the touch display device with active objects (e.g., active pens) having a higher reporting rate. In other words, if the active stylus currently paired with the touch display device is upgraded to one with a higher reporting rate, the accuracy and reliability of the active stylus's reporting rate can be better guaranteed.

[0153] Table 1

[0154] Table 2

[0155] For the embodiment described above in which the image refresh cycle includes six second touch periods and four first touch periods, there are two second touch periods between every two adjacent first touch periods in the four first touch periods. In this case, the pressure information may also include twelve-bit pressure information codes, and receiving pressure information codes of different bits in the multi-bit pressure information codes via the touch sensor during at least two second touch periods in the plurality of second touch periods includes: receiving the twelve-bit pressure information codes via the touch sensor during two second touch periods in the six second touch periods, and receiving six bits of pressure information codes in the twelve-bit pressure information codes via the touch sensor during each second touch period in the two second touch periods.

[0156] Table 3 shows an exemplary format of a downlink signal received by a touch display device when DQPSK (Differential Quadrature Reference Phase Shift Keying) encoding is used, and Table 4 shows an exemplary format of a downlink signal received by a touch display device when QPSK (Quadrature Phase Shift Keying) encoding is used. The following describes an example of receiving different pressure information encoding bits in the multi-bit pressure information encoding via a touch sensor, using Tables 3 and 4 and FIG. 12 .

[0157] As shown in Figure 12, the image refresh cycle includes six second touch periods T2, T3, T5, T6, T8, and T9. As shown in Table 3, during the second touch periods T5 and T6, the touch sensor receives twelve bits of pressure information encoding "Pressure 0," "Pressure 1," ..., "Pressure 11." Furthermore, during each of the two second touch periods T5 and T6, the touch sensor receives six bits of pressure information encoding out of the twelve bits of pressure information encoding. For example, during the second touch period T5, the touch display device receives "Pressure 6 to 11" from an active object (e.g., an active pen) via the touch sensor, and during the second touch period T6, the touch display device receives "Pressure 0 to 5" from an active object (e.g., an active pen) via the touch sensor. As shown in Table 4, during the second touch periods T8 and T9, the touch sensor receives twelve bits of pressure information encoding "Pressure 0," "Pressure 1," ..., "Pressure 11." Furthermore, during each of the two second touch periods T8 and T9, the touch sensor receives six bits of pressure information encoding out of the twelve bits of pressure information encoding. For example, during the second touch period T8, the touch display device receives "Pressures 6 to 11" from an active object (e.g., an active pen) via the touch sensor, and during the second touch period T9, the touch display device receives "Pressures 0 to 5" from the active object (e.g., an active pen) via the touch sensor.

[0158] Table 3

[0159] Table 4

[0160] In some embodiments, the active object includes a power source, and the touch signal from the active object includes power information indicating the state of the power source. For example, the downlink signal transmitted by the active object to the touch-sensitive display device includes the power information. The power information includes a multi-bit power information code. In this case, sensing the touch signal from the active object via the touch sensor during the plurality of second touch periods to detect the touch of the touch-sensitive display device by the active object includes: receiving, via the touch sensor, different bits of the power information code from the multi-bit power information code during at least two of the plurality of second touch periods or during one of the plurality of second touch periods.

[0161] Referring to Table 1 and Figure 5 , the power information includes four bits of power information code, "Balance 0," "Balance 1," "Balance 2," and "Balance 3." The corresponding one-bit power information code is received via the touch sensor during the second touch periods T12, T11, T9, and T8, respectively. That is, the four-bit power information code is received via the touch sensor during four of the eight second touch periods, respectively. In the example shown in Table 1, the touch pressure information of the active object includes twelve bits of pressure information code. Therefore, the touch pressure determined by the touch display device can include 4096 gradients. The power information includes four bits of power information code, and the power state of the active object can be expressed as 16 gradients.

[0162] Referring to Table 3 and Figure 12 , the power information includes eight bits of power information code, "Balance 0" through "Balance 7," which are received via the touch sensor during the second touch period T3. Referring to Table 4 and Figure 12 , the power information includes eight bits of power information code, "Balance 0" through "Balance 7," which are received via the touch sensor during the second touch period T5. That is, the eight bits of power information code are received via the touch sensor during one of the six second touch periods.

[0163] In some embodiments, the active object includes multiple keys, and the touch signal of the active object includes key information indicating the status of the multiple keys, wherein the key information includes multi-bit key information codes corresponding to the multiple keys. In this case, sensing the touch signal of the active object via the touch sensor during the multiple second touch periods to detect the active object touching the touch display device includes: receiving key information codes of different bits in the multi-bit key information codes via the touch sensor during at least two of the multiple second touch periods or during one of the multiple second touch periods. Referring to Table 1 and Figure 5 , key information codes "Key 0" and "Key 1" are received during second touch periods T5 and T4 , respectively. The key information codes "Key 0" and "Key 1" may correspond to different keys of the active object, respectively. Referring to Table 3 and Figure 12 , key information codes "Key 0-1" (i.e., "Key 0" and "Key 1") are received during second touch period T6 . Referring to Table 4 and FIG. 12 , during the second touch period T8 , the key information code “key 0-1” is received.

[0164] In some embodiments, the touch signal of the active object includes inclination information for indicating the inclination angle of the active object relative to the touch display device, and the inclination information includes multi-bit inclination information encoding. Sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: receiving different bits of inclination information encoding in the multi-bit inclination information encoding via the touch sensor during at least two second touch time periods among the multiple second touch time periods.

[0165] Referring to Table 2 and FIG. 5 , the tilt information may include six bits of tilt information codes, "Tilt 0" through "Tilt 5." During the second touch periods T4, T5, T8, T9, T11, and T12, the touch sensor receives the six bits of tilt information codes, "Tilt 5," "Tilt 4," "Tilt 3," "Tilt 2," "Tilt 1," and "Tilt 0," respectively. That is, the touch sensor receives the six bits of tilt information codes during six of the eight second touch periods.

[0166] Referring to Table 3 and FIG. 12 , the tilt information may include ten-bit tilt information codes "Tilt 0" to "Tilt 9." During the second touch period T2, the touch sensor receives "Tilt 8" and "Tilt 9," respectively. During the second touch period T3, the touch sensor receives "Tilt 6" and "Tilt 7," respectively. During the second touch period T5, the touch sensor receives "Tilt 4" and "Tilt 5," respectively. During the second touch period T6, the touch sensor receives "Tilt 2" and "Tilt 3," respectively. During the second touch period T8, the touch sensor receives "Tilt 0" and "Tilt 1," respectively. That is, during five of the six second touch periods, the touch sensor receives the ten-bit tilt information codes. Furthermore, during each of the five second touch periods, the touch sensor receives two of the ten-bit tilt information codes.

[0167] Referring to Table 4 and FIG. 12 , the tilt information may include eight bits of tilt information codes, "Tilt 0" to "Tilt 7." During the second touch period T3, the touch sensor receives "Tilt 6" and "Tilt 7," respectively. During the second touch period T5, the touch sensor receives "Tilt 4" and "Tilt 5," respectively. During the second touch period T6, the touch sensor receives "Tilt 2" and "Tilt 3," respectively. Furthermore, during the second touch period T8, the touch sensor receives "Tilt 0" and "Tilt 1," respectively. That is, during four of the six second touch periods, the touch sensor receives the eight bits of tilt information codes. Furthermore, during each of the four second touch periods, the touch sensor receives two bits of the eight bits of tilt information codes.

[0168] In some embodiments, the touch signal of the active object includes hover information indicating that the active object is in a hovering state and identification information indicating an identifier of the active object. The hover information includes a hover information code, and the identification information includes an identification information code. In this case, sensing the touch signal of the active object via the touch sensor during the plurality of second touch periods to detect the active object touching the touch display device includes: receiving the hover information code and the identification information code via the touch sensor during different second touch periods or the same second touch period among the plurality of second touch periods. In the examples shown in Tables 1 and 2, during the second touch period T1, the touch display device receives the identification information code "pen number" of the active object; during the second touch period T2, the touch display device receives the hover information code "H / I". In the example shown in Table 3, during the second touch period T2, the touch display device receives the identification information code "pen number" of the active object; during the second touch period T5, the touch display device receives the hover information code "H / I". In the example shown in Table 4, during the second touch period T2, the touch display device receives the identification information code "pen number" of the active object and the hovering information code "H / I".

[0169] In some embodiments, the touch signal of the active object may include a multi-bit touch signal code, wherein the multi-bit touch signal code includes one or more of the multi-bit pressure information code, the multi-bit power information code, the multi-bit key information code, the multi-bit tilt information code, the hover information code, and the identification information code. The multi-bit touch signal code of the touch signal of the active object may also include a check bit code, for example, the four-bit check bits CRC 0, CRC 1, CRC 2, and CRC 3 shown in Tables 1 to 4. By setting the check bit code, the integrity of the touch signal code can be tested. However, the embodiments of the present disclosure are not limited thereto, and the touch signal of the active object may also include any other appropriate information code.

[0170] In some embodiments, sensing the touch signal of the active object via the touch sensor during the multiple second touch time periods to detect the touch of the active object on the touch display device includes: during each of the second touch time periods, receiving three to ten touch signal codes from the multi-bit touch signal codes via the touch sensor.

[0171] For the examples shown in Tables 1 and 2, three touch signal codes from the multi-bit touch signal code are received via the touch sensor during each of the second touch periods. During each of the second touch periods T1, T2, T4, T5, T8, T9, T11, and T12, the three touch signal codes are represented as Bit 0, Bit 1, and Bit 2. For the examples shown in Tables 3 and 4, ten touch signal codes from the multi-bit touch signal code are received via the touch sensor during each of the second touch periods. During each of the second touch periods T2, T3, T5, T6, T8, and T9, the ten touch signal codes are represented as Bit 0, Bit 1, ..., Bit 9. In other embodiments, six touch signal codes from the multi-bit touch signal code may also be received via the touch sensor during each of the second touch periods.

[0172] In some embodiments, each touch signal encoding bit in the multi-bit touch signal encoding includes a multi-bit pulse sequence, and the phases of the multi-bit pulse sequences in the touch signal encoding bits of different bits in the multi-bit touch signal encoding differ. As shown in FIG. 24 , each bit encoding bit 0, bit 1, and bit 2 in the three-bit touch signal encoding includes a multi-bit pulse sequence (e.g., each including M pulses), but the phases of the pulse sequences in the different bit encoding bits may differ. For example, the phases of the pulse sequences in touch signal encoding bits 0 and 1 may differ by 180 or 90 degrees, thereby expressing the information content of the touch signal encoding bits of different bits.

[0173] It is understood that the touch signal of the active object can be encoded based on BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying). In some embodiments, at least one of BPSK, a variant of BPSK such as DBPSK (Differential Binary Phase Shift Keying), QPSK, or a variant of QPSK such as DQPSK (Differential Quadrature Reference Phase Shift Keying) can be used for encoding. These encoding methods can transmit digital information by using relative phase changes of carrier waves, for example, by using relative phase changes of carrier waves between adjacent symbols to transmit digital information.

[0174] In some embodiments, if the image refresh frequency of the touch display device is 60Hz or 90Hz, BPSK can be used to encode and decode the touch signal. Figure 25 shows a schematic diagram of a BPSK data theoretical model according to an embodiment of the present disclosure. As shown in Figure 25, each bit of data includes a 2-bit pulse sequence, the phase difference between the pulse sequence in Bit1 and the pulse sequence in start is 180°, the phase difference between the pulse sequence in Bit2 and the pulse sequence in start is 0°, and the phase difference between the pulse sequence in Bit3 and the pulse sequence in start is 0°. When BPSK is used for encoding, the encoding format of the phase variable of the touch signal of the active object can be set with reference to the BPSK data theoretical model shown in Figure 25. In the implementation process, the encoding format can be set to 3 to 10 bits of data, each bit of data includes a 3 to 13-bit pulse sequence and is arranged according to a phase difference of 180°. Then, the touch signal is BPSK-encoded according to the set encoding format to obtain the touch signal encoding. Taking an example where the coding format includes 4 bits of data, each bit of data includes a 4-bit pulse sequence and is arranged with a phase difference of 180°, BPSK encoding is performed on the touch signal according to the coding format to obtain a four-bit touch signal code.

[0175] In some embodiments, if the image refresh frequency of the touch display device is 120Hz, QPSK or DQPSK can be used to encode and decode the touch signal. Figure 26 shows a schematic diagram of a DQPSK data theoretical model according to an embodiment of the present disclosure. As shown in Figure 26, each bit of data includes a 1-bit pulse sequence, the phase difference between the pulse sequence of Bit0 and Bit1 and the pulse sequence in start is 90°, the phase difference between the pulse sequence in Bit2 and Bit3 and the pulse sequence in start is 270°, and the phase difference between the pulse sequence in Bit4 and Bit5 and the pulse sequence in start is 180° or 0°. When DQPSK is used for encoding, the encoding format of the phase variable of the touch signal of the active object can be set with reference to the DQPSK data theoretical model shown in Figure 26. During the implementation process, the encoding format can be set to 3 to 10 bits of data, each bit of data includes a 3 to 13-bit pulse sequence and is arranged according to a phase difference of 90°. Then, the touch signal is DQPSK encoded according to the set encoding format to obtain the touch signal encoding. For example, a 6-bit encoding format, where each bit consists of a 4-bit pulse sequence arranged with a 90° phase difference, can be used to encode the touch signal using DQPSK. It should be noted that DQPSK encoding of touch signals allows the active object to transmit three times the amount of data in the same amount of time compared to BPSK, resulting in a higher data transmission rate.

[0176] Another embodiment of the present disclosure provides a touch processor, comprising: a memory configured to store computer-executable instructions; and a data processor configured to execute the method described in the aforementioned embodiment of the method for interaction between an external object and a touch display device when the computer-executable instructions are executed by the data processor.

[0177] The steps of the methods described in the embodiments of the methods for interacting an external object with a touch-sensitive display device described above can be implemented as computer programs. For example, embodiments of the present application provide a computer program product comprising a computer program carried on a computer-readable medium, the computer program including program code for executing at least one step of the methods for interacting an external object with a touch-sensitive display device described in the embodiments above.

[0178] Another embodiment of the present application provides one or more computer-readable storage media having computer-readable instructions stored thereon, which, when executed, implement the method for interacting with an external object and a touch display device according to some embodiments of the present application. The various steps of the method for interacting with an external object and a touch display device can be converted into computer-readable instructions through programming and stored in a computer-readable storage medium. When such a computer-readable storage medium is read or accessed by a computing device or a computer, the computer-readable instructions therein are executed by a processor on the computing device or the computer to implement the method for interacting with an external object and a touch display device.

[0179] Yet another embodiment of the present disclosure provides a touch display device, including a touch sensor and a touch processor, wherein the touch processor is configured to execute the method described in the aforementioned embodiment of the method for interaction between an external object and a touch display device.

[0180] Another embodiment of the present disclosure provides a touch system, comprising the touch display device as described in the above embodiment and an active object, wherein the active object is configured to send a downlink signal to the touch display device in response to receiving the uplink signal, and the active object comprises an active pen.

[0181] In some embodiments, the active object is further configured to determine a current image refresh cycle of the touch display device based on the uplink signal, and send a downlink signal corresponding to the current image refresh cycle to the touch display device.

[0182] Yet another embodiment of the present disclosure provides a computer program product, including a computer program, which, when executed by a processor, implements the interaction method as described in any one of the aforementioned method embodiments.

[0183] Although the present application has been described in conjunction with some embodiments, it is not intended to be limited to the specific forms set forth herein. Instead, the scope of the present application is limited only by the appended claims. Additionally, although individual features may be included in different claims, these may potentially be advantageously combined, and inclusion in different claims does not imply that a combination of features is not feasible and / or advantageous. The order of features in the claims does not imply any specific order in which the features must operate.

Claims

1. A method for interacting an external object with a touch display device, wherein the touch display device includes a touch sensor, wherein: The interaction method includes: An image refresh cycle of the touch display device includes a plurality of display driving periods and a plurality of non-display driving periods, the display driving periods and the non-display driving periods alternate with each other, the plurality of non-display driving periods include four first touch periods and eight second touch periods, each first touch period or each second touch period is a non-display driving period, wherein the image refresh cycle includes at least two second touch periods located between two adjacent first touch periods, and two second touch periods exist between every two adjacent first touch periods in the four first touch periods; as well as The external object includes an active object or a passive object, the touch display device receives a communication signal from the active object, senses the touch signal of the passive object via the touch sensor during the four first touch time periods to detect the touch of the touch display device by the passive object, and senses the touch signal of the active object via the touch sensor during the eight second touch time periods to detect the touch of the touch display device by the active object.

2. The interactive method according to claim 1, wherein: The plurality of non-display driving periods in the one image refresh cycle further include a noise processing period.

3. The interactive method according to claim 2, wherein: The number of the first touch periods and the second touch periods on both sides of the noise processing period is equal.

4. The interactive method according to any one of claims 2 to 3, wherein: Detecting the touch of the passive object on the touch display device and detecting the touch of the active object on the touch display device respectively include collecting a touch signal of the passive object sensed by the touch sensor and collecting a touch signal of the active object sensed by the touch sensor. The interaction method further includes: During the noise processing period, obtaining a signal-to-noise ratio of at least one of a touch signal of the active object or a touch signal of the passive object; and In response to the signal-to-noise ratio being lower than a threshold, a frequency of collecting touch signals of the active object or the passive object is adjusted.

5. The interactive method according to claim 1, wherein: A time length of each first touch period in the four first touch periods and a time length of each second touch period in the eight second touch periods do not exceed a first threshold.

6. The interactive method according to claim 5, wherein: The first threshold is 180 microseconds.

7. The interactive method according to claim 5, wherein: The first touch periods and the second touch periods have the same time length.

8. The interactive method according to claim 1, further comprising: If the touch display device does not receive a communication signal from the active object, the touch display device senses a touch signal from a passive object via the touch sensor during the eight second touch periods to detect a touch of the passive object on the touch display device.

9. The interactive method according to claim 8, further comprising: If the touch display device does not receive a communication signal from the active object, the touch display device does not detect touches of the active object and the passive object on the touch display device during the four first touch periods.

10. The interaction method according to claim 1, further comprising: The touch display device sends an uplink signal to the external object, and periodically sends the uplink signal to the external object with the image refresh period of the touch display device as the sending period, and the uplink signal includes a first character segment, and the first character segment is used to represent the current image refresh period of the touch display device.

11. The interactive method according to claim 10, wherein: The uplink signal further includes a second character segment, and the second character segment is used to represent the frequency at which the active object sends a downlink signal to the touch display device.

12. The interactive method according to claim 10, wherein: The uplink signal includes 7 bits of data.

13. The interactive method according to claim 12, wherein: The uplink signal is encoded using direct sequence spread spectrum, and each bit of data is encoded as a P-bit spread spectrum code sequence, where P is a positive integer.

14. The interactive method according to claim 13, wherein: Each bit of data is encoded as a 31-bit spreading code sequence.

15. The interactive method according to claim 13, wherein: The uplink signal is encoded using direct sequence spread spectrum and a pseudo-random noise code corresponding to a current image refresh period of the touch display device.

16. The interactive method according to claim 1, wherein: The touch signal of the active object includes pressure information indicating a touch pressure of the active object on the touch display device, the pressure information including a multi-bit pressure information code, and sensing the touch signal of the active object via the touch sensor during the eight second touch periods to detect the touch of the active object on the touch display device includes: During at least two second touch time periods among the eight second touch time periods, pressure information codes of different bits in the multi-bit pressure information code are received via the touch sensor.

17. The interactive method according to claim 16, wherein: The pressure information includes twelve-bit pressure information codes, and receiving, via the touch sensor, pressure information codes of different bits in the multi-bit pressure information codes during at least two of the eight second touch time periods, respectively, includes: The twelve-bit pressure information codes are received via the touch sensor during six of the eight second touch time periods, and two of the twelve-bit pressure information codes are received via the touch sensor during each of the six second touch time periods.

18. The interactive method according to claim 1, wherein: The active object includes a power source, the touch signal of the active object includes power information indicating a state of the power source, the power information includes a multi-bit power information code, and sensing the touch signal of the active object via the touch sensor during the eight second touch periods to detect the touch of the touch display device by the active object includes: During at least two second touch time periods among the eight second touch time periods, power information codes of different bits in the multi-bit power information code are received via the touch sensor.

19. The interactive method according to claim 18, wherein: The power information includes a four-bit power information code, and receiving the power information code of different bits in the multi-bit power information code via the touch sensor during at least two second touch periods of the eight second touch periods includes: The four-bit power information code is received via the touch sensor during four of the eight second touch time periods respectively.

20. The interactive method according to claim 1, wherein: The active object includes a plurality of keys, the touch signal of the active object includes key information indicating states of the plurality of keys, the key information includes multi-bit key information codes corresponding to the plurality of keys, and sensing the touch signal of the active object via the touch sensor during the eight second touch control periods to detect the touch of the touch display device by the active object includes: During at least two second touch time periods among the eight second touch time periods, key information codes of different bits in the multi-bit key information codes are received via the touch sensor.

21. The interactive method according to claim 1, wherein: The touch signal of the active object includes tilt information indicating a tilt angle of the active object relative to the touch display device, the tilt information including a multi-bit tilt information code, and sensing the touch signal of the active object via the touch sensor during the eight second touch time periods to detect the touch of the active object on the touch display device includes: During at least two second touch periods among the eight second touch periods, tilt information codes of different bits in the multi-bit tilt information code are received via the touch sensor.

22. The interactive method according to claim 21, wherein: The tilt information includes a six-bit tilt information code, and receiving, via the touch sensor, different bits of the tilt information code in the multi-bit tilt information code during at least two of the eight second touch time periods, includes: The six-bit tilt information code is received via the touch sensor during six of the eight second touch time periods respectively.

23. The interactive method according to claim 1, wherein: The touch signal of the active object includes hovering information for indicating that the active object is in a hovering state, and identification information for indicating an identification of the active object, the hovering information includes a hovering information code, and the identification information includes an identification information code. Sensing the touch signal of the active object via the touch sensor during the eight second touch periods to detect that the active object touches the touch display device includes: The hovering information code and the identification information code are received via the touch sensor during different second touch periods among the eight second touch periods.

24. The interactive method according to claim 1, wherein: The touch signal of the active object includes a multi-bit touch signal code, the multi-bit touch signal code includes at least one of a multi-bit pressure information code, a multi-bit power information code, a multi-bit key information code, a multi-bit tilt information code, a hover information code, an identification information code, and a check bit code, and sensing the touch signal of the active object via the touch sensor during the eight second touch time periods to detect the touch of the active object on the touch display device includes: During each of the eight second touch control periods, three to six touch signal codes among the multi-bit touch signal codes are received via the touch sensor.

25. The interactive method according to claim 24, wherein: Each touch signal code in the multi-bit touch signal code includes a multi-bit pulse sequence, and the phases of the multi-bit pulse sequences in touch signal codes of different bits in the multi-bit touch signal code are different.

26. The interactive method according to claim 25, wherein: The touch signal of the active object is encoded based on a binary phase shift keying (BPSK) format.

27. A touch processor, comprising: a memory configured to store computer-executable instructions; A data processor configured to perform the interaction method according to any one of claims 1 to 26 when the computer executable instructions are executed by the data processor.

28. A computer-readable storage medium storing computer-executable instructions, wherein when the computer-executable instructions are executed, the interactive method according to any one of claims 1 to 26 is executed.

29. A touch display device comprising a touch sensor and a touch processor. The touch processor is configured to execute the interaction method according to any one of claims 1 to 26.

30. A touch control system comprising the touch display device according to claim 29 and an active object, The active object is configured to send a downlink signal to the touch display device in response to receiving the uplink signal, and the active object includes an active pen.

31. The touch control system according to claim 30, wherein: The active object is further configured to determine a current image refresh period of the touch display device according to the uplink signal, and send a downlink signal corresponding to the current image refresh period to the touch display device.

32. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the interactive method according to any one of claims 1 to 26 is implemented.

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