Display device and driving method thereof, and active pen

Abstract

The present application provides a display device and a driving method thereof, and an active pen; the display device divides a frame at a second frequency in a display panel into a first time period, a second time period, and a third time period, uses the second time period to transmit display data, uses the first time period and the third time period to transmit an uplink signal with a lower anti-interference capability, adjusts the data transmission sequence of the active pen, and uses the third time period to transmit first touch data with a lower anti-interference capability. When the uplink signal and the first touch data are transmitted within one frame, since the first time period and the third time period will not transmit display data, there is no display noise, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display device and a driving method thereof, and an active pen. Background Art

[0002] Existing touch display devices will adapt to active pens to facilitate the operation of touch display devices. During the operation of the active pen, the touch chip and the active pen will interact with each other through signals, so that the display panel will display the corresponding picture or switch the picture according to the operation of the active pen. Specifically, taking a touch display device with a universal serial interface as a protocol as an example, during the communication process with the active pen, the touch chip will receive the handshake signal of the active pen to achieve the connection between the active pen and the display panel, and will also receive the touch signal of the active pen to determine the operation of the active pen, and display the corresponding picture or switch the picture on the display panel. Since the communication protocol between the active pen and the touch chip will use a waveform of a certain frequency, there will be noise on the display panel when it is displayed. When the frequency of the noise is close to the frequency of the signal of the active pen, it will interfere with the signal of the active pen, resulting in information confusion and failure to display the correct picture according to the touch signal of the active pen.

[0003] Therefore, the existing touch display device has a technical problem that display noise interferes with the signal of the active pen, resulting in failure to display the correct image. Summary of the invention

[0004] The embodiments of the present application provide a display device and a driving method thereof, and an active pen, which are used to alleviate the technical problem that display noise in existing touch display devices interferes with the signal of the active pen, resulting in failure to display a correct image.

[0005] An embodiment of the present application provides a display device, which includes:

[0006] A display panel, wherein the display panel comprises a first frequency and a second frequency, wherein the first frequency is greater than the second frequency; and a display time of one frame corresponding to the second frequency comprises a first time period, a second time period and a third time period in sequence;

[0007] a touch chip connected to the display panel, wherein the touch chip is configured to send an uplink signal to the active pen in a first time period and a third time period of a previous frame when the display panel is at a second frequency, and receive a downlink signal returned by the active pen based on the uplink signal; the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data;

[0008] The touch control chip is configured to transmit display data in the second time period, receive the first touch control data in the third time period, and drive the display panel based on the downlink signal.

[0009] In some embodiments, the touch control chip is configured to detect the active pen in real time, and when the active pen is detected, control the display panel to switch from the first frequency to the second frequency.

[0010] In some embodiments, the touch chip is configured to divide the display time of a frame corresponding to the second frequency by the display time of a frame corresponding to the first frequency, and divide the display time of a frame corresponding to the second frequency into a first time period, a second time period and a third time period; the sum of the length of the first time period and the length of the second time period is less than the length of the display time of a frame corresponding to the first frequency.

[0011] In some embodiments, the display time of a frame corresponding to the first frequency includes a display time period and an initialization time period, the length of the first time period is equal to the length of the initialization time period, and the length of the second time period is equal to the length of the display time period.

[0012] In some embodiments, the first touch data includes pressure data and angle data, and the touch chip is configured to sequentially receive the pressure data and the angle data in the third time period, or sequentially receive the angle data and the pressure data in the third time period.

[0013] In some embodiments, the duration of the third time period is greater than the sum of the duration of the pressure data transmission and the duration of the angle data transmission.

[0014] In some embodiments, the downlink link signal further includes a response signal, and the touch control chip is configured to establish a link between the display panel and the active pen after receiving the response signal transmitted by the active pen.

[0015] In some embodiments, the touch control chip is configured to receive the second touch control data between a time period corresponding to the response signal and a time period of the first touch control data after receiving the response signal in a second time period.

[0016] At the same time, an embodiment of the present application provides an active pen, which interacts with the display device described in any of the above embodiments, and the active pen includes:

[0017] A pen tip, the pen tip being configured to receive an uplink signal sent by the touch chip, and to send a response signal and second touch data in a second time period based on the uplink signal, and to send pressure data in a third time period;

[0018] The pen ring is configured to return angle data in a third time period; the pressure data and the angle data are first touch data, and the first touch data, the second touch data and the response signal are downlink signals.

[0019] At the same time, an embodiment of the present application provides a display device driving method, which drives the display device described in any of the above embodiments, and the display device driving method includes:

[0020] Detecting an active pen in real time, and when the active pen is detected, controlling the display panel to switch from a first frequency to a second frequency; the first frequency is greater than the second frequency; and a display time of a frame corresponding to the second frequency includes a first time period, a second time period, and a third time period in sequence;

[0021] Sending an uplink signal to the active pen in the first time period and the third time period of the previous frame, and receiving a downlink signal returned by the active pen based on the uplink signal; the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data; specifically including transmitting display data in the second time period, and receiving the first touch data in the third time period;

[0022] The display panel is driven based on the downlink signal.

[0023] Beneficial effects: The present application provides a display device and a driving method thereof, and an active pen; the display device includes a display panel and a touch chip, the display panel includes a first frequency and a second frequency, the first frequency is greater than the second frequency, the display time of a frame corresponding to the second frequency includes a first time period, a second time period and a third time period in sequence, the touch chip is connected to the display panel, and the touch chip is configured to send an uplink signal to the active pen in the first time period and the third time period of the upper frame when the display panel is at the second frequency, and receive a downlink signal returned by the active pen based on the uplink signal, the downlink signal includes first touch data and second touch data, the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data, wherein the touch chip is configured to transmit display data in the second time period, receive the first touch data in the third time period, and drive the display panel based on the downlink signal. The present application divides a frame at the second frequency in the display panel into a first time period, a second time period and a third time period, uses the second time period to transmit display data, uses the first time period and the third time period to transmit an uplink signal with a lower anti-interference capability, adjusts the data transmission order of the active pen, and uses the third time period to transmit the first touch data with a lower anti-interference capability. When the uplink signal and the first touch data are transmitted within one frame, since the display data will not be transmitted in the first time period and the third time period, there is no display noise, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The technical solution and other beneficial effects of the present application will be made apparent by describing in detail the specific implementation methods of the present application in conjunction with the accompanying drawings.

[0025] Figure 1 A schematic diagram of communication between a display device and an active pen provided in an embodiment of the present application.

[0026] Figure 2 This is a timing diagram of normal communication in the current display device provided in an embodiment of the present application.

[0027] Figure 3 This is a timing diagram when a communication error occurs in the current display device provided in an embodiment of the present application.

[0028] Figure 4 A schematic diagram of a display screen when a communication error occurs in the current display device provided in an embodiment of the present application.

[0029] Figure 5 A schematic diagram of a display device provided in an embodiment of the present application.

[0030] Figure 6 A schematic diagram of an active pen provided in an embodiment of the present application.

[0031] Figure 7 This is a flow chart of a display device driving method provided in an embodiment of the present application.

[0032] Figure 8 This is a timing diagram corresponding to the display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0034] The embodiments of the present application aim to solve the technical problem that display noise in existing touch display devices interferes with the signal of an active pen, resulting in an inability to display a correct image. A display device and a driving method thereof, and an active pen are provided to solve the above technical problem.

[0035] like Figure 1 As shown, taking the communication between the active pen and the display device through the USI (Universal Serial Interface) protocol as an example, a USIFrame (i.e., a frame under the Universal Serial Interface) is shown as follows Figure 1 As shown, after receiving the uplink signal UpLink from the display device, the active pen will send a Data Packet (pen pressure information) and a Position Packet (position information) in the process of returning DownLink, so that the display device can display according to the operation of the active pen.

[0036] Specifically, Figure 1 Here, Single Stylus refers to a single active stylus, Stylus ID=1 indicates the information of the active stylus, Beacon N refers to the waveform sent by the driving electrode and the receiving electrode in the display device, Controller Commands&synch is the controller signal & synchronization, Turnaround Gap refers to the time for the uplink signal to be converted into a downlink signal, Stylus ACK (0.5ms) refers to the signal returned by the active stylus, Data=TS1-TS2 indicates the time length for sending the pen pressure information, Position=TS3-TS4 indicates the time length for sending the position information, Timeslot=250us indicates the duration is 250 microseconds, Example With 0.5ms Packets indicates taking the information within 0.5 milliseconds as an example, and Tralling Time is the trailing time.

[0037] like Figure 2As shown, during the current interaction between the active pen and the display device, the frequency of the display device is 60 Hz, that is, Figure 2 The normal transmission of the 60Hz Frame (one frame at 60 Hz) signal is as follows: first, the uplink signal Uplink is transmitted through the display device, and then the response signal ACK, pressure data Pressure Data and position data Position Data returned by the Pen Tip of the active pen, as well as the angle data Ring Data returned by the Pen Ring of the active pen are received. At the same time, the display signal INT is transmitted normally.

[0038] However, during the transmission of the signal, some signals are easily interfered with, resulting in Figure 3 The waveform shown in the figure shows a communication error. Figure 3 As shown, it can be seen that each signal sent by the active pen is Wrong Data, and the display device cannot display normally.

[0039] like Figure 4 As shown, when signal interference occurs, during the process of the active pen drawing a line, the line displayed by the display device has waves instead of a straight line, indicating that the signal of the active pen is wrong and cannot be displayed normally.

[0040] In response to the above technical issues, such as Figure 5 As shown, an embodiment of the present application provides a display device, the display device 1 comprising:

[0041] A display panel 11, wherein the display panel 11 comprises a first frequency and a second frequency, wherein the first frequency is greater than the second frequency; and a display time of one frame corresponding to the second frequency comprises a first time period, a second time period and a third time period in sequence;

[0042] a touch chip 12 connected to the display panel 11, wherein the touch chip 12 is configured to send an uplink signal to the active pen in a first time period and a third time period of a previous frame when the display panel 11 is at a second frequency, and receive a downlink signal returned by the active pen based on the uplink signal; the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data;

[0043] The touch control chip 12 is configured to transmit display data in the second time period, receive the first touch control data in the third time period, and drive the display panel 11 based on the downlink signal.

[0044] An embodiment of the present application provides a display device, which divides a frame at a second frequency in a display panel into a first time period, a second time period, and a third time period, uses the second time period to transmit display data, uses the first time period and the third time period to transmit an uplink signal with a lower anti-interference capability, adjusts the data transmission order of an active pen, and uses the third time period to transmit first touch data with a lower anti-interference capability. When the uplink signal and the first touch data are transmitted within one frame, since the first time period and the third time period will not transmit display data, there is no display noise, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0045] In one embodiment, the touch chip is configured to detect the active pen in real time, and when the active pen is detected, control the display panel to switch from the first frequency to the second frequency. Since the signal of the active pen is better when transmitted at the second frequency, when the active pen interacts with the display device, if the display panel is at the first frequency and needs to be switched from the first frequency to the second frequency, the touch chip can be configured to detect the active pen in real time, so that when the active pen is detected, the display panel is controlled to switch from the first frequency to the second frequency.

[0046] Specifically, when the display panel is at the second frequency, there is no need to switch the frequency of the display panel, and the display panel only needs to maintain the second frequency.

[0047] In one embodiment, the touch chip is configured to divide the display time of a frame corresponding to the second frequency by the display time of a frame corresponding to the first frequency, and divide the display time of a frame corresponding to the second frequency into a first time period, a second time period and a third time period; the sum of the length of the first time period and the length of the second time period is less than the length of the display time of a frame corresponding to the first frequency. By dividing the display time of the second frequency by the display time of the first frequency, the display data can be sent normally at the second frequency, avoiding the failure to send the display data normally due to the second time period being too short.

[0048] In one embodiment, the display time of one frame corresponding to the first frequency includes a display time period and an initialization time period, the length of the first time period is equal to the length of the initialization time period, and the length of the second time period is equal to the length of the display time period. By making the length of the first time period equal to the length of the initialization time period, and the length of the second time period equal to the length of the display time period, when the display panel is at the second frequency, the display data can be normally transmitted through the first time period and the second time period, so that the display panel displays normally, and the third time period can be used to transmit the signal that is susceptible to interference in the active pen, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0049] The problem that the pressure data and angle data of the active pen are easily interfered with. In one embodiment, the first touch data includes pressure data and angle data, and the touch chip is configured to sequentially receive the pressure data and the angle data in the third time period, or sequentially receive the angle data and the pressure data in the third time period. In the data transmitted by the active pen, the pen will transmit the pressure data to the electrodes in the touch chip, which is easily interfered with. The angle data in the active pen is transmitted through the pen ring. Since the height of the pen ring from the display device is greater than the pen tip, the signal energy is low and easily interfered with. Therefore, the pressure data and angle data are used as the first touch data, and the angle data and pressure data are transmitted in the third time period to avoid interference with the angle data and pressure data.

[0050] Specifically, when transmitting the angle data and the pressure data, the angle data may be transmitted first and then the pressure data, or the pressure data may be transmitted first and then the angle data, so that the angle data and the pressure data are transmitted in the third time period.

[0051] In one embodiment, the duration of the third time period is greater than the sum of the duration of the pressure data transmission and the duration of the angle data transmission. By making the duration of the third time period greater than the sum of the duration of the pressure data transmission and the duration of the angle data transmission, both the pressure data and the angle data can be completely transmitted in the third time period, avoiding that the pressure data and the angle data are partially transmitted in the second time period, causing the pressure data and the angle data to be affected.

[0052] In one embodiment, the downlink link signal also includes a response signal, and the touch chip is configured to establish a link between the display panel and the active pen after receiving the response signal transmitted by the active pen. After the touch chip sends the uplink link signal, it is necessary to receive the response signal returned by the active pen, and establish a link between the display panel and the active pen based on the response signal, so as to display on the display panel according to the data of the active pen.

[0053] In one embodiment, the touch chip is configured to receive the second touch data between the time period corresponding to the response signal and the time period of the first touch data after receiving the response signal in the second time period. When transmitting the second touch data, the second touch data can be received between the time corresponding to the response signal and the time period of the first touch data. Since the second touch data is not easily interfered, the second touch data can be transmitted normally.

[0054] Specifically, a signal susceptible to interference means that when the interference is greater than or equal to -60 decibels, the signal will be affected and errors will occur.

[0055] like Figure 6 As shown, an embodiment of the present application provides an active pen, which interacts with the display device described in any of the above embodiments, and the active pen 2 includes:

[0056] The pen tip 21 is configured to receive an uplink signal sent by the touch chip, and send a response signal and second touch data in a second time period based on the uplink signal, and send pressure data in a third time period;

[0057] The pen ring 22 is configured to return angle data in a third time period; the pressure data and the angle data are first touch data, and the first touch data, the second touch data and the response signal are downlink signals.

[0058] An embodiment of the present application provides an active pen, which interacts with a display device by dividing a frame at a second frequency in a display panel into a first time period, a second time period, and a third time period, using the second time period to transmit display data, using the first time period and the third time period to transmit an uplink signal with a lower anti-interference capability, adjusting the data transmission order of the active pen, and using the third time period to transmit first touch data with a lower anti-interference capability. When the uplink signal and the first touch data are transmitted within one frame, since the first time period and the third time period will not transmit display data, there is no display noise, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0059] In one embodiment, if Figure 6 As shown, the active pen 2 further includes a pen body 23 , and the pen body 23 is connected to the pen tip 21 and the pen ring 22 .

[0060] At the same time, if Figure 7 As shown, an embodiment of the present application provides a display device driving method, the display device driving method drives the display device described in any of the above embodiments, and the display device driving method includes:

[0061] S1, detecting an active pen in real time, and when the active pen is detected, controlling the display panel to switch from a first frequency to a second frequency; the first frequency is greater than the second frequency; the display time of one frame corresponding to the second frequency includes a first time period, a second time period and a third time period in sequence;

[0062] S2, sending an uplink signal to the active pen in the first time period and the third time period of the previous frame, and receiving a downlink signal returned by the active pen based on the uplink signal; the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data; specifically including transmitting display data in the second time period, and receiving the first touch data in the third time period;

[0063] S3, driving the display panel based on the downlink signal.

[0064] An embodiment of the present application provides a display device driving method, which divides a frame at a second frequency in a display panel into a first time period, a second time period, and a third time period, uses the second time period to transmit display data, uses the first time period and the third time period to transmit an uplink signal with a lower anti-interference capability, adjusts the data transmission order of an active pen, and uses the third time period to transmit first touch data with a lower anti-interference capability. When the uplink signal and the first touch data are transmitted within one frame, since the first time period and the third time period will not transmit display data, there is no display noise, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0065] In one embodiment, before the step of detecting the active pen in real time and controlling the display panel to switch from the first frequency to the second frequency when the active pen is detected, it also includes: when the display panel is at the second frequency, determining the display time of one frame of the display panel, and dividing one frame into a first time period, a second time period and a third time period in sequence according to the display time in one frame.

[0066] When switching modes for different frequencies, the data transmission modes of the display panel at different frequencies are different. In one embodiment, when the display panel is at the second frequency, before the step of determining the display time of a frame of the display panel and dividing the frame into a first time period, a second time period and a third time period in sequence according to the display time in the frame, it also includes:

[0067] parsing the driving frequency data to determine a frequency switching mode of the display panel;

[0068] According to the frequency switching mode of the display panel, the signal transmission mode of the display panel with different frequencies is determined. In the driving of the display panel, the frequency switching mode of the display panel is predetermined, and the circuit and driving method in the display panel are designed accordingly, so that the display panel can perform frequency switching according to the frequency switching mode. For different frequency switching modes, the data transmission method of the display panel is different. Therefore, it is necessary to first determine the signal transmission mode of the display panel according to the frequency switching mode of the display panel, so that the time of the display panel can be divided according to the signal transmission mode to avoid display noise affecting the data of the active pen.

[0069] Specifically, taking the display frequency of the display panel switching from high frequency to low frequency (for example, the "Long V" switching mode, that is, by increasing the time of one frame, keeping the display time unchanged, and not outputting signals during the increased time) as an example, when the display panel switches to a relatively low frequency, a certain amount of time will be added, while the actual display time remains unchanged. In this case, the present application can use the increased time to perform active pen signal transmission, thereby avoiding the interference of display noise during display data transmission on the signal transmission of the active pen. Taking the display frequency switching mode of the display panel as frame skip as an example, the display frequency switching mode will perform frequency switching by ignoring frames. For example, when switching from a high frame rate to a low frame rate, one frame is scanned and the other frame is stopped for signal transmission in the low frame rate to reduce the frame rate. At this time, one of the two adjacent frames will not perform display data transmission. Therefore, the frame that does not perform display data transmission can perform active pen signal transmission, thereby avoiding the interference of display noise on the signal transmission of the active pen. Therefore, before dividing the time period, the display frequency switching mode can be predetermined to facilitate switching of a frame.

[0070] It should be noted that when the display frequency switching mode is to ignore frames (frame skip), since the low frame rate will adopt a method of scanning one frame and stopping signal transmission of the other frame, at this time, a repeated data transmission is actually completed through two frames. Therefore, in fact, in the low frame rate, the total duration of two adjacent frames is the time of a valid frame. Therefore, in the following embodiments, the total duration of two adjacent frames will be described as the time of a valid frame, which will not be repeated here. Here, two adjacent frames are taken as an example, but the method of realizing frequency switching by three or more adjacent frames is not limited.

[0071] In order to solve the problem that the display time of the display panel after frame rate conversion overlaps with the signal transmission time of the active pen, which may cause signal interference, in one embodiment, when the display panel is at the second frequency, the step of determining the display time of a frame of the display panel, and dividing the frame into a first time period, a second time period, and a third time period in sequence according to the display time in the frame includes:

[0072] When the display panel is at a first frequency, determining a display time of one frame of the display panel;

[0073] Determining, according to the display time of one frame of the display panel at the first frequency and the signal transmission mode, the display time of one frame of the display panel when the display panel is at a second frequency;

[0074] According to the total time of one frame of the display panel at the second frequency and the display time of one frame of the display panel, the frame is divided into a first time period, a second time period and a third time period in sequence. The display time of one frame at the first frequency is used to determine the length of the necessary display time during the transmission of the display panel. When the display panel is switched to a low frame rate, i.e., the second frequency, the display time can be determined by dividing the time of one frame corresponding to the second frequency, and the first time period, the second time period and the third time period can be determined according to the display time and the total time of one frame, so that a signal susceptible to interference can be transmitted outside the display time, avoiding the interference of noise existing during display on the signal of the active pen.

[0075] In one embodiment, the step of dividing the frame into a first time period, a second time period, and a third time period in sequence according to the total time of one frame of the display panel at the second frequency and the display time of one frame of the display panel includes:

[0076] When the display panel is at a second frequency, acquiring initialization information of the display panel;

[0077] Parsing the initialization information of the display panel to determine the initialization time of one frame of the display panel;

[0078] Determining a first time period of the display panel according to an initialization time of a frame of the display panel;

[0079] Determining a second time period of the display panel according to a display time of one frame of the display panel;

[0080] The third time period is determined according to the total time of one frame of the display panel, the first time period, and the second time period. The first time period of the display panel is determined by the initialization time of the display panel, and the second time period of the display panel is determined according to the display time of one frame of the display panel. The third time period can be determined according to the total time of one frame of the display panel, the first time period, and the second time period. The first time period, the second time period, and the third time period are divided in sequence. In the process of signal transmission of display data and active pen, the signals can be sent in sequence to avoid the reversal of the signal transmission order and cause deviation of the display panel.

[0081] In one embodiment, the step of dividing the frame into a first time period, a second time period, and a third time period in sequence according to the total time of one frame of the display panel at the second frequency and the display time of one frame of the display panel includes:

[0082] determining a third time period of the display panel according to the signal transmission mode, a display time of a frame of the display panel at the first frequency, and a total time of a frame of the display panel at the second frequency;

[0083] Determining a second time period of the display panel according to a display time of one frame of the display panel;

[0084] The first time period is determined according to the total time of one frame of the display panel, the second time period and the third time period. The third time period of the display panel is determined by the signal transmission mode, and the second time period of the display panel is determined by the display time of one frame of the display panel. The first time period can be determined according to the total time of one frame, the second time period and the third time period, and the first time period, the second time period and the third time period are divided in sequence. In the process of signal transmission of display data and active pen, the signals can be sent in sequence to avoid the deviation of the display panel caused by the inversion of the signal transmission order.

[0085] Specifically, taking the display frequency switching mode of ignoring frames (frame skip) as an example, its signal transmission mode is that one frame in a valid frame is used to transmit display data, and the other frame does not transmit data. Then, by determining the frame that does not transmit data in the valid frame, the time period can be used as the third time period. The frame used to transmit display data must include an initialization phase and a display phase. Therefore, the second time period can be determined according to the display time, and then the first time period is determined.

[0086] In order to solve the problem that noise may interfere with the signal of the active pen when transmitting display data, in one embodiment, the step of receiving the first touch data in the third time period includes:

[0087] When the display panel is at a second frequency, analyzing the first touch data to obtain pressure data and angle data;

[0088] In the third time period of the frame, the pressure data and the angle data are received in sequence, or the angle data and the pressure data are received in sequence. When the display panel is at the second frequency, by predetermining that the pressure data and the angle data (Ring Data) are susceptible to noise interference, the transmission time of the pressure data and the angle data is modified so that the pressure data and the angle data are both transmitted in the third time period, avoiding the noise generated during the display time from interfering with the pressure data and the angle data. Since the pressure data and the angle data are transmitted in the same frame, the pressure data and the angle data can be transmitted in sequence, or the angle data and the pressure data can be transmitted in sequence.

[0089] In one embodiment, the step of sending an uplink signal to the active pen in the first time period and the third time period of the previous frame, and receiving a downlink signal returned by the active pen based on the uplink signal, includes: receiving the second touch data in the frame.

[0090] In order to solve the problem that the second touch data may also be interfered by noise during display time, in one embodiment, the step of receiving the second touch data in the frame includes:

[0091] When the display panel is at a second frequency, the first touch data is transmitted using the third time period of the frame, and a first transmission time of the uplink signal, a second transmission time of the response signal, and a third transmission time of the first touch data are determined;

[0092] Determine a remaining time of the third time period according to the first transmission time, the second transmission time, the third transmission time, the first time period, and the third time period;

[0093] The second touch data is received in the frame according to the second time period of the frame and the remaining time. The remaining time of the third time period is determined by the uplink signal, the response signal, and the transmission time of the first touch data. When the second touch data is transmitted, the remaining time of the third time period can be used to transmit the second touch data, thereby reducing or avoiding the transmission of the second touch data in the display time period, thereby reducing the possibility of interference with the second touch data and improving the stability of the signal and data transmission of the active pen.

[0094] In one embodiment, before the step of receiving the second touch data in the frame according to the second time period of the frame and the remaining time, the method further includes:

[0095] acquiring a fourth transmission time of the second touch data;

[0096] The fourth transmission time is compared with the remaining time, and when the fourth transmission time is less than the remaining time, the second touch data is transmitted in the remaining time. By receiving the second touch data in the remaining time when the fourth transmission time is less than the remaining time, it is possible to avoid transmitting the first touch data and the second touch data during the display time, and avoid the noise existing during the display time from interfering with the first touch data and the second touch data, resulting in abnormal images displayed by the display panel.

[0097] In order to solve the problem that the second touch data may also be interfered by noise during the display time, in one embodiment, the step of receiving the second touch data in the frame according to the second time period of the frame and the remaining time includes:

[0098] Determining a data transmission time according to the second time period of the frame and the remaining time;

[0099] acquiring a fourth transmission time of the second touch data;

[0100] When the sum of the fourth transmission time and the time intervals of adjacent data transmissions is less than the data transmission time, the remaining time and part of the second time period are used to receive the second touch data. By using the remaining time and part of the second time period to transmit the second touch data, when transmitting the signal of the active pen, the first time period and the third time period are fully utilized, the length of time for the active pen signal to be transmitted during the display time is reduced or avoided, and the interference of the noise of the display time on the second time period is reduced or eliminated.

[0101] In one embodiment, when the sum of the fourth transmission time and the time intervals of adjacent data transmissions is less than the data transmission time, before the step of using the remaining time and part of the second time period to receive the second touch data, the step further includes:

[0102] comparing the data transmission time and the fourth transmission time;

[0103] When the sum of the fourth transmission time and the time interval of adjacent data transmissions is less than the data transmission time, the fourth transmission time is modified so that the sum of the fourth transmission time and the time interval of adjacent data transmissions is equal to the data transmission time. By making full use of the time of one frame for the data transmission process of the active pen, each data can have sufficient time to be sent, thus avoiding the problem of incomplete data transmission and display problems. The second touch data has a strong anti-interference ability, which can avoid the noise of the display time from interfering with the data susceptible to interference, and the data of the active pen can be sent completely.

[0104] It should be noted that the above embodiment is described in detail using the display panel including two frequencies as an example, but the embodiments of the present application are not limited to this. For example, when the display panel includes three frequencies, the signal transmission process with weak anti-interference ability in the active pen can also be carried out during the time when the display data is not transmitted.

[0105] It should be noted that the above embodiment is described in detail using two display frequency switching methods, namely "Long V" and frame skip, as examples, but the embodiments of the present application are not limited to this, and other display frequency switching methods in which there are time periods when the display time is not transmitted can adopt the above method.

[0106] It should be noted that, since there will be a time period when the display panel is at a high frequency and no display data is transmitted, for example, there will be initialization before the adjacent frame display data is transmitted, but since this time is short, it is only used as the initialization time for the display data and cannot completely transmit the signal with low anti-interference ability in the active pen. Therefore, when the display panel is a single-frequency display panel or the display panel is a multi-frequency display panel and the display panel is at a high frequency, there will inevitably be noise interference with the signal of the active pen when transmitting the signal of the active pen. The present application transmits data with poor anti-interference ability in the active pen during the time when the display data is not transmitted at a low frequency, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0107] Specifically, taking the display panel including 120 Hz and 60 Hz and the frequency switching mode adopted is frameskip as an example, it can be known that the time added in 60 Hz is the sum of the display time and the initialization time. This time is the length of an effective frame at 120 Hz, which is sufficient to transmit some data of the active pen with low anti-interference ability, or even sufficient to transmit all the data of the active pen. At 120 Hz, the time within a frame is mainly used to transmit display data, which will inevitably lead to overlap in the transmission time of the data with low anti-interference ability in the active pen and the display data. Therefore, the present application transmits the data with poor anti-interference ability in the active pen during the time when the display data is not transmitted in the low frequency, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0108] Specifically, the present application also adjusts the transmission order of various data of the active pen so that data with poor anti-interference ability during the interaction between the active pen and the display panel can be transmitted during the time period when the display data is not transmitted, and fully utilizes the time period when the display data is not transmitted for data transmission, without reducing the time of each data transmission to cause defects in the display data.

[0109] like Figure 8As shown, taking the first frequency of the display panel as 120 Hz and the second frequency as 60 Hz as an example, when the display panel is at 60 Hz, Figure 8 As shown, a frame can be divided into multiple time periods, namely Figure 8 The 60Hz Frame (one frame at 60Hz) includes a first time period VBP, a third time period VFP, and a second time period between the first time period VBP and the third time period VFP. When transmitting the interactive signal between the display panel and the active pen, it is necessary to first establish a connection between the display panel and the active pen. Therefore, Figure 8 As shown, it is necessary to first send the uplink signal Uplink of the display panel to the active pen. The present application adopts the third time period of the previous frame and the first time period VBP of the current frame for transmission. Compared with the prior art which only sends signals in sequence, the uplink signal is sent in the first time period and the display time, causing the uplink signal to be interfered by the display noise. The present application sends the uplink signal in the first time period and the third time period, thereby avoiding the interference of the noise existing when the display data is sent on the uplink signal.

[0110] Then you need to receive the downlink signal returned by the active pen, including Figure 8 The Pen-Tip and Pen-Ring in the display panel need to receive the response signal first to establish the connection between the display panel and the active pen. Since the response signal has a strong anti-interference ability and needs to be transmitted before the signal transmission of other active pens, Figure 8 The response signal ACK is located in the second time period, but please note that due to the longer transmission time of the uplink signal Uplink, the response signal ACK can only be transmitted in the second time period. However, when there is still time remaining in the first time period, the response signal ACK can be transmitted in the first time period. This application does not limit this.

[0111] After the connection between the display panel and the active pen is established through the uplink signal Uplink and the response signal ACK, the active pen touch data can be transmitted so that the display panel can display accordingly according to the touch data. Figure 8 As shown, the present application changes the transmission order and transmission time of the first touch data and the second touch data, specifically transmitting the pressure data Pressure Data and the angle data Ring Data in the first touch data in a third time period, and transmitting the position data Position Data in the second touch data using the time between the first touch data and the response signal, thereby avoiding noise interference to the first touch data with poor anti-interference ability, and each data can still be transmitted within one frame.

[0112] As for the data of other display panels, they can be sent normally, such as Figure 8As shown, the row synchronization signal Hsync, the column synchronization signal Vsync and the data signal source can be sent normally according to the change of the frame rate.

[0113] According to the above embodiments, it can be seen that:

[0114] The embodiment of the present application provides a display device and a driving method thereof, and an active pen; the display panel includes a first frequency and a second frequency, the first frequency is greater than the second frequency, and the display time of a frame corresponding to the second frequency includes a first time period, a second time period and a third time period in sequence, and a touch chip is connected to the display panel. The touch chip is configured to send an uplink signal to the active pen in the first time period and the third time period of the upper frame when the display panel is at the second frequency, and receive a downlink signal returned by the active pen based on the uplink signal, the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data, wherein the touch chip is configured to transmit display data in the second time period, receive the first touch data in the third time period, and drive the display panel based on the downlink signal. The present application divides a frame at the second frequency in the display panel into a first time period, a second time period and a third time period, uses the second time period to transmit display data, uses the first time period and the third time period to transmit an uplink signal with a lower anti-interference capability, adjusts the data transmission order of the active pen, and uses the third time period to transmit the first touch data with a lower anti-interference capability. When the uplink signal and the first touch data are transmitted within one frame, since the display data will not be transmitted in the first time period and the third time period, there is no display noise, thereby avoiding the interference of display noise on the data of the active pen and improving the recognition rate of the touch data of the active pen.

[0115] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0116] The above is a detailed introduction to a display device and its driving method, and an active pen provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device, characterized in that: include: A display panel, the display panel comprising a first frequency and a second frequency, the first frequency being greater than the second frequency; The display time of one frame corresponding to the second frequency includes a first time period, a second time period and a third time period in sequence; a touch chip connected to the display panel, wherein the touch chip is configured to send an uplink signal to the active pen in a first time period and a third time period of a previous frame when the display panel is at a second frequency, and receive a downlink signal returned by the active pen based on the uplink signal; the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data; The touch control chip is configured to transmit display data in the second time period, receive the first touch control data in the third time period, and drive the display panel based on the downlink signal; The downlink link signal further includes a response signal, and the touch control chip is configured to establish a link between the display panel and the active pen after receiving the response signal transmitted by the active pen; The touch control chip is configured to receive the second touch control data between a time period corresponding to the response signal and a time period of the first touch control data after receiving the response signal in a second time period.

2. The display device according to claim 1, wherein: The touch chip is configured to detect the active pen in real time, and when the active pen is detected, control the display panel to switch from the first frequency to the second frequency.

3. The display device according to claim 1, wherein: The touch chip is configured to divide the display time of a frame corresponding to the second frequency by the display time of a frame corresponding to the first frequency, and divide the display time of a frame corresponding to the second frequency into a first time period, a second time period and a third time period; the sum of the length of the first time period and the length of the second time period is less than the length of the display time of a frame corresponding to the first frequency.

4. The display device according to claim 3, characterized in that The display time of one frame corresponding to the first frequency includes a display time period and an initialization time period. The length of the first time period is equal to the length of the initialization time period, and the length of the second time period is equal to the length of the display time period.

5. The display device according to claim 1, wherein: The first touch control data includes pressure data and angle data, and the touch control chip is configured to sequentially receive the pressure data and the angle data in the third time period, or sequentially receive the angle data and the pressure data in the third time period.

6. The display device according to claim 5, characterized in that The duration of the third time period is greater than the sum of the duration of the pressure data transmission and the duration of the angle data transmission.

7. An active pen, characterized in that: Interacting with the display device according to any one of claims 1 to 6, the active pen comprising: A pen tip, the pen tip being configured to receive an uplink signal sent by the touch chip, and to send a response signal and second touch data in a second time period based on the uplink signal, and to send pressure data in a third time period; The pen ring is configured to return angle data in a third time period; the pressure data and the angle data are first touch data, and the first touch data, the second touch data and the response signal are downlink signals.

8. A display device driving method, characterized in that: Driving the display device according to any one of claims 1 to 6, the display device driving method comprising: Detecting an active pen in real time, and when the active pen is detected, controlling the display panel to switch from a first frequency to a second frequency; the first frequency is greater than the second frequency; and a display time of a frame corresponding to the second frequency includes a first time period, a second time period, and a third time period in sequence; Sending an uplink signal to the active pen in the first time period and the third time period of the previous frame, and receiving a downlink signal returned by the active pen based on the uplink signal; the downlink signal includes first touch data and second touch data, and the anti-interference capability of the first touch data is lower than the anti-interference capability of the second touch data; specifically including transmitting display data in the second time period, and receiving the first touch data in the third time period; The display panel is driven based on the downlink signal.

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