Near field communication control method and apparatus, and display device

Abstract

The embodiment of the present disclosure provides a near field communication control method, device and display equipment. The near field communication control device is applied to the display equipment, the display equipment comprises a display panel, a near field communication coil and a display control circuit, the display panel comprises a plurality of display periods, the display period comprises a field blanking stage and an effective display stage, and the near field communication control device comprises: a first receiving module configured to receive a synchronization signal output by the display control circuit, the synchronization signal being used for controlling the display panel to display a picture in the effective display stage; and a driving module configured to output a driving signal to the near field communication coil in the field blanking stage according to the synchronization signal.

Description

Near-field communication control methods, devices and display equipment Technical Field

[0001] This disclosure relates to the field of display technology, and specifically to a near-field communication control method, apparatus, and display device. Background Technology

[0002] NFC (Near Field Communication) is a short-range, high-frequency wireless technology that enables identification and data exchange with compatible devices over short distances. NFC can be integrated into mobile terminals to function as access keys, information verification, and, combined with the payment capabilities of mobile terminals, can also be used as a transportation card, credit card, payment card, and more. Summary of the Invention

[0003] This disclosure provides a near-field communication control method, apparatus, and display device.

[0004] In a first aspect, embodiments of this disclosure provide a near-field communication control device applied in a display device. The display device includes a display panel, a near-field communication coil, and a display control circuit. The display panel includes multiple display cycles, each display cycle including a blanking phase and an active display phase. The near-field communication control device includes:

[0005] The first receiving module is configured to receive a synchronization signal output by the display control circuit, the synchronization signal being used to control the display panel to display an image during the effective display phase;

[0006] The driving module is configured to output a driving signal to the near-field communication coil during the field blanking phase, based on the synchronization signal.

[0007] In some embodiments, the drive module includes:

[0008] The processing submodule is configured to determine the start time of each output drive signal based on the pre-acquired correspondence between the synchronization signal and the field blanking phase, wherein the start time is within the field blanking phase;

[0009] The output submodule is configured to output a drive signal within a preset duration starting from the start time, wherein the preset duration is less than the pre-configured blanking back shoulder duration.

[0010] In some embodiments, the synchronization signal includes a field synchronization signal, and the start time of the i-th output drive signal is the time of the i×N-th effective edge of the field synchronization signal.

[0011] In some embodiments, the processing submodule is specifically configured as follows:

[0012] Based on the synchronization signal, the duration of the display cycle of the display panel is determined;

[0013] Based on the cycle length of the display cycle and a preset ratio, the cycle length of the control cycle of the near-field communication control module is determined, wherein the cycle length of the control cycle is the interval between the start times of two adjacent outputs of the drive signal.

[0014] Based on the pre-acquired correspondence between the synchronization signal and the field blanking stage, the start time of the first output drive signal is determined;

[0015] The start time of each subsequent output drive signal is determined based on the start time of the first output drive signal and the duration of the control cycle.

[0016] In some embodiments, the synchronization signal includes the field synchronization signal and / or the line synchronization signal.

[0017] In some embodiments, the drive signal includes a plurality of pulses;

[0018] The output submodule includes:

[0019] The crystal oscillator is configured to generate the initial clock signal;

[0020] Timer;

[0021] A pulse generation circuit is configured to generate an initial drive signal within a preset duration, starting from the start time, based on the timing of the timer and the initial clock signal, wherein the initial drive signal is a digital signal;

[0022] A digital-to-analog converter circuit is configured to perform digital-to-analog conversion on the initial drive signal, generate and output the drive signal.

[0023] In some embodiments, the apparatus further includes:

[0024] The second receiving module is configured to receive the induced signal from the near-field communication coil and preprocess the induced signal.

[0025] The sending module sends the preprocessed sensing information to the main control module, so that the main control module can determine the interaction information between the external device and the display device based on the sensing information.

[0026] In some embodiments, the preprocessing includes analog-to-digital conversion.

[0027] Secondly, embodiments of this disclosure provide a near-field communication control method applied in a display device, the display device including a display panel, a near-field communication coil, and a display control circuit, wherein the display process of the display panel includes multiple display cycles, the display cycle including a field blanking phase and an effective display phase, and the method includes:

[0028] The system receives a synchronization signal output by the display control circuit, the synchronization signal being used to control the display panel to display an image during the effective display phase;

[0029] According to the synchronization signal, a drive signal is output to the near-field communication coil during the field blanking phase.

[0030] In some embodiments, outputting a drive signal to the near-field communication coil during the field blanking phase according to the synchronization signal includes:

[0031] Based on the pre-acquired correspondence between the synchronization signal and the field blanking phase, the start time of each output drive signal is determined, and the start time is within the field blanking phase;

[0032] Starting from the initial moment, a drive signal is output within a preset duration, wherein the preset duration is less than the pre-configured blanking back shoulder duration.

[0033] In some embodiments, the synchronization signal includes a field synchronization signal, and the start time of the i-th output drive signal is the time of the i×N-th effective edge of the field synchronization signal.

[0034] In some embodiments, determining the start time of each output drive signal based on the pre-acquired correspondence between the synchronization signal and the field blanking stage includes:

[0035] Based on the synchronization signal, the duration of the display cycle of the display panel is determined;

[0036] Based on the cycle length of the display cycle and a preset ratio, the cycle length of the control cycle of the near-field communication control module is determined, wherein the cycle length of the control cycle is the interval between the start times of two adjacent outputs of the drive signal.

[0037] Based on the pre-acquired correspondence between the synchronization signal and the field blanking stage, the start time of the first output drive signal is determined;

[0038] The start time of each subsequent output drive signal is determined based on the start time of the first output drive signal and the duration of the control cycle.

[0039] In some embodiments, the synchronization signal includes the field synchronization signal and / or the line synchronization signal.

[0040] Thirdly, embodiments of this disclosure provide a display device, including a display panel, a near-field communication coil, and the aforementioned near-field communication control device. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 is a schematic diagram of an NFC device.

[0043] Figure 2 is a schematic diagram of the arrangement of NFC devices in a display device.

[0044] Figure 3 is a schematic diagram of the arrangement of NFC devices in another display device.

[0045] Figure 4a is a schematic diagram of a near-field communication control device provided in an embodiment of this disclosure.

[0046] Figure 4b is a schematic diagram of the structure of the driving module provided in an embodiment of this disclosure.

[0047] Figure 5a is a timing diagram of a field synchronization signal and an enable signal provided in an embodiment of this disclosure.

[0048] Figure 5b is a timing diagram of a line synchronization signal and an enable signal provided in an embodiment of this disclosure.

[0049] Figure 6 is a schematic diagram of another near-field communication control device provided in an embodiment of this disclosure.

[0050] Figure 7 is a schematic flowchart of a near-field communication control method provided in an embodiment of this disclosure.

[0051] Figure 8a is a schematic flowchart of step S21 provided in an embodiment of this disclosure.

[0052] Figure 8b is a schematic flowchart of another step S21 provided in an embodiment of this disclosure.

[0053] Figure 9 is a schematic diagram of the structure of a display device provided in an embodiment of this disclosure. Detailed Implementation

[0054] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0056] Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] NFC (Near Field Communication) is a short-range, high-frequency wireless technology that enables identification and data exchange with compatible devices over short distances. It allows for information exchange, content access, and service exchange between any two wireless devices, facilitating communication. NFC can be integrated into mobile terminals for functions such as access control keys and information verification. Combined with the payment capabilities of mobile terminals, it can also be used as a transportation card, credit card, payment card, and more.

[0058] Figure 1 is a schematic diagram of an NFC device. As shown in Figure 1, the NFC device includes an NFC coil 11 and an NFC control device 12 (e.g., an NFC IC). The NFC control device 12 operates in two phases: a polling phase and a listening phase. During the polling interval, the NFC control device 12 outputs a drive signal (which may include multiple pulses) to the NFC coil 11 to drive the NFC coil 11 to transmit and receive radio frequency signals. During the listening phase, the NFC control device 12 reads the induced signal on the NFC coil 11, processes the signal, and sends it to the front-end main control module. The main control module then determines whether an external device is near the NFC coil and identifies the interaction signal between the external device and the NFC device. In one example, the listening phase lasts approximately 1.5 seconds.

[0059] With the development of radio technology, NFC devices are increasingly being used in display devices to enable communication between display devices and other wireless devices.

[0060] Figure 2 is a schematic diagram of the arrangement of an NFC device in a display device. As shown in Figure 2, the display device includes a display panel 21, an NFC device 22, and a driving circuit board 23. The NFC device 22 includes an NFC coil and an NFC control device. The driving circuit board 23 is located on the non-display side of the display panel 21 and is connected to the display panel 21 via a flexible circuit board. The aforementioned NFC control device 22 and display control circuit are disposed on the driving circuit board 23. Ferrite is also disposed on the driving circuit board. Adding threads to the surface of the ferrite can concentrate the magnetic flux, thereby improving the strength and stability of the NFC device's radio frequency signal transmission and reception.

[0061] Figure 3 is a schematic diagram of the arrangement of an NFC device in another display device. To further improve the integration between the NFC device and the display device, two NFC coils are set in another display device, as shown in Figure 3. The display device includes a display panel 31, an NFC device, a flexible circuit board 33, and a driver circuit board 34. The driver circuit board 34 is electrically connected to the display panel 31 through the flexible circuit board 33. The NFC device includes an NFC coil 320 and an NFC control device (not shown in the figure). A display control chip is set on the driver circuit board 34 to control the display screen of the display panel. The display panel includes a display area AA and a peripheral area. The NFC coil 320 includes a first coil 321 and a second coil 322. The first coil 321 is located in the peripheral area of ​​the display panel. The second coil 322 and the NFC control device are integrated on the driver circuit board, and the first coil 321 and the second coil 322 are connected in parallel.

[0062] Regardless of the specific structure of the NFC device, during operation, the NFC control device needs to send a drive signal to the NFC coil during the polling phase. When the display frequency of the display panel is high, the polling phase can easily overlap with the screen display phase, causing interference between the drive signal and the display signal (such as the data signal). This interference can lead to screen flickering on the display panel.

[0063] To solve at least one of the above-mentioned technical problems, this disclosure provides a near-field communication control device. FIG4a is a schematic diagram of the structure of a near-field communication control device provided in this disclosure.

[0064] As shown in Figure 4a, the near-field communication control device provided in this embodiment is applied in a display device. The display device includes a display panel, a near-field communication coil, and a display control circuit. The display panel includes multiple display cycles, and the display cycle includes a field blanking phase and an effective display phase. The near-field communication control device includes a first receiving module 10 and a driving module 20.

[0065] The first receiving module 10 is configured to receive a synchronization signal output by the display control circuit, which is used to control the display panel to display the image during the effective display phase. The driving module 20 is configured to output a driving signal to the near-field communication coil during the field blanking phase, based on the synchronization signal.

[0066] In some embodiments, the synchronization signal includes a frame synchronization signal and / or a line synchronization signal.

[0067] It's important to note that when a display panel plays video, it breaks the video down into multiple frames for display. The refresh rate of the display panel is the number of image frames displayed per second. Refresh rate is usually expressed in Hertz (Hz). For example, a refresh rate of 60Hz means that the display panel displays 60 frames per second. The display duration of each frame represents one display cycle. With a refresh rate of 60Hz, the display cycle is 1 / 60th of a second.

[0068] The display panel includes multiple rows of pixels, a gate driving circuit for providing scan signals to the multiple rows of pixels, and a data driving circuit for providing data signals to the multiple rows of pixels. When displaying a frame of image, the gate driving circuit provides scan signals to the multiple rows of pixels row by row. For each row of pixels receiving a scan signal, the data driving circuit provides a data signal to that row of pixels for display. Notably, after providing a scan signal to the last row of pixels based on the previous frame, a scan signal is not immediately provided to the first row of pixels based on the next frame. In other words, there is a certain interval between the effective display phases in two adjacent display cycles; this interval is called the field blanking period.

[0069] Figure 5a is a timing diagram of a field synchronization signal and an enable signal provided in an embodiment of the present disclosure, and Figure 5b is a timing diagram of a line synchronization signal and an enable signal provided in an embodiment of the present disclosure. The field synchronization signal indicates that the display panel is about to start displaying a frame of image, and the line synchronization signal is in an active state (e.g., a low level state) indicating that the scanning of the next row of pixels is about to begin. Each cycle of the enable signal corresponds to one line cycle. When the enable signal is in an active state (e.g., a high level), the source drive circuit outputs an active data signal to the corresponding row of pixels so that the row of pixels can be displayed.

[0070] Taking a display panel with a resolution of 1024×768 bpi as an example, as shown in Figure 5a, the effective level of the field synchronization signal Vsync is low, and the effective level of the first enable signal DE1 is high. Data signals are only output from the data line when the first enable signal DE1 is active; that is, the effective display phase of the image is when DE1 is active. Furthermore, after the field synchronization signal Vsync reaches its active level, the first enable signal DE1 cannot be immediately enabled. The interval from the end of the active level of the field synchronization signal Vsync to the beginning of the active level of the first enable signal DE1 is the rear shoulder period t3 of the field blanking phase. The interval from the end of the active level of the enable signal of the previous frame to the beginning of the field synchronization signal is the front shoulder phase t1 of the field synchronization signal. The front shoulder period t1, the duration of the active level of the field synchronization signal t2, and the rear shoulder period t3 together constitute the field blanking period t. The interval T1 between two adjacent field synchronization signals represents the period length of the display cycle.

[0071] Similarly, as shown in Figure 5b, the effective level of the horizontal synchronization signal Hsync is low. The preceding shoulder period ti', the low-level period t2', and the following shoulder period t3' of the horizontal synchronization signal together constitute the horizontal blanking period t'. The effective level of the second enable signal DE2 is high. When the second enable signal DE2 is in an effective state, the data line refreshes the display of one row of pixels, i.e., 1024 pixels.

[0072] The field blanking period t is actually the interval between the display panel displaying adjacent frames of images. During this period, no display signal is provided to the pixels of the display panel. Therefore, in this embodiment of the present disclosure, the near-field communication control device outputs a drive signal to the near-field communication coil during the field blanking phase according to the field synchronization signal and / or the line synchronization signal, thereby avoiding interference between the drive signal and the display signal of the display panel, which would cause display defects.

[0073] Figure 4b is a schematic diagram of the structure of the driving module provided in an embodiment of the present disclosure. In some embodiments, the driving module 20 includes a processing submodule 21 and an output submodule 22.

[0074] The processing submodule 21 is configured to determine the start time of each output drive signal based on the pre-acquired correspondence between the synchronization signal and the field blanking stage, wherein the start time is within the field blanking stage. The output submodule 22 is configured to output the drive signal within a preset duration starting from the start time, wherein the preset duration is less than the pre-configured blanking back shoulder duration.

[0075] As shown in Figure 5a, since there is a certain correspondence between the field blanking stage and the synchronization signal, the starting time of the field blanking stage can be determined based on this correspondence. Furthermore, the time period of the output drive signal is very short. Therefore, when the drive signal is output at the starting time of the field blanking stage, the overlap between the drive signal and the display signal in time can be reduced or prevented.

[0076] In some embodiments, the synchronization signal includes a field synchronization signal, and the start time of the i-th output drive signal is the time of the i×N-th effective edge in the field synchronization signal.

[0077] Typically, the interval between drive signals is longer than the display cycle length. Therefore, a drive signal can be output every N display cycles, with the start time of the output drive signal being the effective edge of the field synchronization signal. Here, N is an integer greater than 1, and N can be set according to actual needs. For example, it can be determined based on the display cycle length and the required control cycle length of the near-field communication control module. For instance, if the required control cycle length is t0 and the display cycle length is t, then N is set to an integer close to or equal to t0 / t.

[0078] The control cycle of the near-field communication control module is the polling phase + listening phase mentioned above.

[0079] It should be noted that the field synchronization signal can be either a high-level signal or a low-level signal. When it is a high-level signal, the effective edge is a rising edge, and when it is a low-level signal, the effective edge is a falling edge. Of course, when the field synchronization signal is a high-level signal, the effective edge can also be a falling edge; when the field synchronization signal is a low-level signal, the effective edge can also be a rising edge. This embodiment does not specify any of these settings.

[0080] In some embodiments, the processing submodule is specifically configured as follows:

[0081] Based on the synchronization signal, determine the duration of the display cycle of the display panel; based on the duration of the display cycle and the preset ratio, determine the duration of the control cycle of the near-field communication control module; based on the pre-acquired correspondence between the synchronization signal and the field blanking stage, determine the start time of the first output drive signal; based on the start time of the first output drive signal and the duration of the control cycle, determine the start time of each subsequent output drive signal.

[0082] The preset ratio represents the ratio of the control cycle duration to the display cycle duration. This preset ratio is an integer greater than 1. Assuming the display cycle duration is t and the preset ratio is x, the control cycle duration of the near-field communication control module is t × x. The preset ratio x can be set as needed. For example, the standard setting for the preset ratio x is: t × x between 1s and 2s. For instance, if the display cycle is 1 / 60s, the preset ratio x can be set between 60 and 120.

[0083] In other words, after determining the start time of the first output drive signal, the processing submodule can output the drive signal according to the duration of the control cycle. For example, if the duration of the control cycle is t0, then after the first output drive signal, a drive signal can be output every time t0. Since the duration of the control cycle is an integer multiple of the duration of the display cycle, after the first output of the drive signal during the vertical blanking phase, every subsequent output of the drive signal will also be during the vertical blanking phase, avoiding interference between the drive signal and the display signal on the display panel, which could lead to display defects.

[0084] Figure 6 is a schematic diagram of another near-field communication control device provided in an embodiment of this disclosure. This near-field communication control device can be integrated into a chip. In some embodiments, the first receiving module 10 has multiple interfaces, such as: a first interface, a second interface, a clock signal interface, an initialization signal interface, an I2C interface, an SPI interface, and a reset signal interface. The first interface and the second interface are both connected to a display driving circuit. For example, the first interface is used to receive a field synchronization signal, and the second interface is used to receive a line synchronization signal.

[0085] The first receiving module 10 is connected to the driving module 20 via the transmission module 700. The driving module 20 includes the aforementioned processing submodule 21 and output submodule 22. The output submodule 22 is used to output a driving signal, which includes multiple pulses. The output submodule 22 includes: a crystal oscillator 222 (OSC), a timer 221, a pulse generation subcircuit 223, and a conversion circuit 224. The crystal oscillator 222 is configured to generate an initial clock signal. The pulse generation subcircuit 223 is configured to generate an initial driving signal within a preset duration, starting from the initial moment, based on the timer's timing and the initial clock signal. The initial driving signal is a digital signal. The conversion circuit 224 includes a digital-to-analog converter and an analog-to-digital converter. The digital-to-analog converter is configured to perform digital-to-analog conversion on the initial driving signal, generating and outputting the driving signal. The processing submodule 21 and the pulse generation circuit 223 can be integrated into a microprocessor (MCU).

[0086] In addition, the initial drive signal generated by the pulse generation circuit 223 can be stored in the random access memory (RAM) first, and the digital-to-analog converter can read the initial drive signal from the random access memory.

[0087] In addition, the near-field communication control device may also include a Universal Integrated Circuit Card (UICC) for storing user information, authentication keys, payment methods, and other information; it may also include a Secure Element (SE) for handling all transactions involving sensitive data and encryption, which require separate processing to enable mobile payment, key verification, and other functions on the device where the near-field communication control device is located. The near-field communication control device may also include a power supply module 800 for powering the device.

[0088] In some embodiments, the near-field communication control device further includes a second receiving module 300 and a transmitting module (not shown). The second receiving module 300 is configured to receive induction information from the near-field communication coil and preprocess the induction information. The conversion circuit further includes an analog-to-digital conversion circuit, and the preprocessing may include analog-to-digital conversion processing performed using the analog-to-digital conversion circuit. The transmitting module is configured to send the preprocessed induction information to the main control module, so that the main control module determines the interaction information between the external device and the display device based on the induction information.

[0089] The main control module can interact with the near-field communication control device and the display control circuit. It can send control signals to the display control circuit based on the interaction information between the external device and the display device, so that the display control circuit can control the display panel to display the image corresponding to the interaction information.

[0090] The functions of the second receiving module and the transmitting module can be implemented through the I2C and SPI serial bus. The signals of the near-field communication control device are transmitted to other network access points or control ports through I2C / SPI to realize data interaction with other communication devices.

[0091] Figure 7 is a schematic flowchart of a near-field communication control method provided in an embodiment of this disclosure, applied in a display device. The display device includes a display panel, a near-field communication coil, and a display control circuit. The display process of the display panel includes multiple display cycles, each including a blanking phase and an effective display phase. As shown in Figure 7, the method includes:

[0092] Step S1: Receive the synchronization signal output by the display control circuit. The synchronization signal is used to control the display panel to display the image during the effective display phase.

[0093] Step S2: Based on the synchronization signal, output a drive signal to the near-field communication coil during the field blanking stage.

[0094] Since the blanking period is actually the interval between the display panel displaying adjacent frames, the display panel does not output a refresh signal during this period. Therefore, in this embodiment, the near-field communication control device outputs a drive signal to the near-field communication coil during the blanking period, thereby avoiding interference between the drive signal and the refresh signal of the display panel, which could cause display defects.

[0095] In some embodiments, step S2 includes:

[0096] Step S21: Based on the pre-acquired correspondence between the synchronization signal and the field blanking stage, determine the start time of each output drive signal, with the start time falling within the field blanking stage.

[0097] Step S22: Starting from the initial time, output a drive signal within a preset duration, where the preset duration is less than the pre-configured blanking back shoulder duration.

[0098] Since the vertical blanking phase is determined based on the correspondence between the synchronization signal and the vertical blanking phase, it includes the active level phase of the vertical synchronization signal and the blanking back shoulder phase. Because the vertical blanking phase is determined by the active level of the synchronization signal, the start time of the output drive signal can be any time within the active level period. Since the blanking phase also includes a back shoulder phase following the active level phase, drive signals output within a preset duration shorter than the blanking back shoulder duration will not exceed the vertical blanking phase, thus preventing interference between the refresh signals of the display panel and avoiding display defects.

[0099] Figure 8a is a schematic flowchart of step S21 provided in an embodiment of the present disclosure. In some embodiments, as shown in Figure 8a, the synchronization signal includes a field synchronization signal. Step S21 may specifically include: step S210, where the start time of the i-th output drive signal is the time of the i×N-th effective edge in the field synchronization signal.

[0100] In one example, the near-field communication control device outputs a drive signal every 1.5 seconds, and the display period of the display panel is 1 / 60 seconds. Therefore, N is 90. That is, every time the image is refreshed 90 times, that is, every time the field synchronization signal is output 90 times, the near-field communication control device outputs a drive signal at the rising edge of the field synchronization signal.

[0101] Figure 8b is a schematic flowchart of another step S21 provided in an embodiment of this disclosure. In some embodiments, as shown in Figure 8b, the synchronization signal may include a field synchronization signal and / or a line synchronization signal. In this case, step S21 may specifically include steps S211-S214:

[0102] Step S211: Determine the duration of the display cycle of the display panel based on the synchronization signal.

[0103] When the synchronization signal is a field synchronization signal, the interval between two adjacent field synchronization signals can be determined as the duration of the display cycle. When the synchronization signal is a line synchronization signal, the line synchronization signals can be counted to determine the number of lines on the display panel and the duration of refreshing two adjacent lines of pixels, thereby determining the duration of refreshing the entire screen. Combined with the duration of the pre-acquired field blanking phase, the duration of the display cycle can be determined.

[0104] Step S212: Determine the duration of the control cycle of the near-field communication control module based on the duration of the display cycle and the preset ratio. The drive module outputs a drive signal of the preset duration at the start of the control cycle.

[0105] To ensure that each drive signal falls within the blanking phase, the control cycle duration needs to be set to an integer multiple of the display cycle duration. The control cycle duration is determined by identifying the period with the smallest difference between the integer multiples of the display cycle duration and the reference cycle duration.

[0106] In one example, the display cycle duration is 1 / 75s, and the reference cycle duration for the control cycle is 1.5s. 1.5 / (1 / 75) = 112.5, which is not an integer multiple. Therefore, the control cycle duration is set to (1 / 75)×112s or (1 / 75)×113s.

[0107] Step S213: Determine the start time of the first output drive signal based on the pre-acquired correspondence between the synchronization signal and the field blanking stage.

[0108] Since the field blanking phase begins immediately after the effective edge of the synchronization signal, the start time of the first output drive signal can be set to the time of the first effective edge of the field synchronization signal.

[0109] It should be noted that the blanking phase also includes the back shoulder phase. Therefore, the start time of the first output drive signal can be any time in the effective level phase, and the embodiments of this disclosure do not limit this.

[0110] Step S214: Determine the start time of each subsequent output drive signal based on the start time of the first output drive signal and the duration of the control cycle.

[0111] In other words, after the start time of the first output drive signal, a drive signal is output once every control cycle duration.

[0112] It should be understood that the premise for ensuring that each drive signal falls within the field blanking phase is that the duration of the control cycle is an integer multiple of the duration of the display cycle. Therefore, it is necessary to monitor the duration of the display cycle in real time. When a change in the duration of the display cycle is detected according to the method in step S211, the duration of the control cycle needs to be re-determined according to the method in S212 to ensure that there is no interference between the drive signal issued by the near-field communication control device and the refresh signal of the display panel.

[0113] Figure 9 is a schematic diagram of a display device provided in an embodiment of this disclosure. As shown in Figure 9, the display device includes a main control module, a display panel, a display control circuit, a near-field communication coil, and the aforementioned near-field communication control device. It can be configured as shown in Figure 2 or as shown in Figure 3.

[0114] The near-field communication control device is electrically connected to the display control circuit to receive synchronization signals, including field synchronization signals and / or horizontal synchronization signals. The near-field communication control device outputs a drive signal to the near-field communication coil during the field blanking phase based on the field synchronization signals and / or horizontal synchronization signals, thereby avoiding interference between the drive signals and the display signals of the display panel, which could cause display defects on the display panel.

[0115] In addition, the main control module can interact with the near-field communication control device via I2C / SPI serial port, and also with the display control circuit via MIPI. Thus, based on the interaction information between the external device and the display device, it can send control signals to the display control circuit, so that the display control circuit can control the display panel to display the image corresponding to the interaction information according to the control signals.

[0116] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A near-field communication control device, applied in a display device, the display device comprising a display panel, a near-field communication coil, and a display control circuit, wherein, The display panel includes multiple display cycles, each including a field blanking phase and an active display phase. The near-field communication control device includes: a first receiving module configured to receive a synchronization signal output by the display control circuit, the synchronization signal being used to control the display panel to display an image during the active display phase; and a driving module configured to output a driving signal to the near-field communication coil during the field blanking phase according to the synchronization signal; the synchronization signal includes a field synchronization signal and / or a horizontal synchronization signal; the field blanking phase includes a front shoulder phase, an active duration phase of the field synchronization signal, and a back shoulder phase; the front shoulder phase is the phase from the end of the active enable signal level of the previous frame image to the start of the field synchronization signal of the current frame image; the back shoulder phase is the phase from the end of the active enable signal level of the field synchronization signal to the start of the active enable signal level of the current frame image; the driving module includes: a processing submodule configured to determine the start time of each output driving signal based on a pre-acquired correspondence between the synchronization signal and the field blanking phase, the start time being within the field blanking phase; and an output submodule configured to... The system is configured to output a drive signal within a preset duration starting from the initial time, where the preset duration is less than the duration of a pre-configured back shoulder phase. Specifically, the processing submodule is configured to: determine the period duration of the display cycle of the display panel based on the synchronization signal; when the synchronization signal is a field synchronization signal, the period duration of the display cycle is the interval between two adjacent field synchronization signals; when the synchronization signal is a line synchronization signal, determining the period duration of the display cycle includes counting the line synchronization signals to determine the period duration of the display cycle; determine the period duration of the control cycle of the near-field communication control device based on the period duration of the display cycle and a preset ratio, wherein the period duration of the control cycle is the interval between the start times of two adjacent outputs of the drive signal; determine the start time of the first output drive signal based on the pre-acquired correspondence between the synchronization signal and the field blanking phase; and determine the start time of each subsequent output drive signal based on the start time of the first output drive signal and the period duration of the control cycle.

2. The near-field communication control device according to claim 1, wherein, The start time of the i-th output drive signal is the time of the i×N-th effective edge in the field synchronization signal, where N is an integer greater than 1.

3. The near-field communication control device according to claim 1, wherein, The driving signal includes multiple pulses; The output submodule includes: a crystal oscillator configured to generate an initial clock signal; a timer; a pulse generation circuit configured to generate an initial drive signal within a preset duration based on the timing of the timer and the initial clock signal, starting from the start time, wherein the initial drive signal is a digital signal; and a digital-to-analog converter circuit configured to perform digital-to-analog conversion on the initial drive signal to generate and output the drive signal.

4. The near-field communication control device according to any one of claims 1 to 3, wherein, The device further includes: a second receiving module configured to receive induction information from a near-field communication coil and preprocess the induction information; and a sending module configured to send the preprocessed induction information to a main control module, so that the main control module can determine the interaction information between the external device and the display device based on the induction information.

5. The near-field communication control device according to claim 4, wherein, The preprocessing includes analog-to-digital conversion.

6. A near-field communication control method, implemented by the near-field communication control device according to any one of claims 1-5, wherein the method is applied in a display device, the display device comprising a display panel, a near-field communication coil, and a display control circuit, wherein... The display process of the display panel includes multiple display cycles, each including a field blanking phase and an effective display phase. The method includes: receiving a synchronization signal output by the display control circuit, the synchronization signal being used to control the display panel to display an image during the effective display phase; outputting a drive signal to the near-field communication coil during the field blanking phase according to the synchronization signal; the synchronization signal including a field synchronization signal and / or a horizontal synchronization signal; the field blanking phase including a front shoulder phase, an effective duration phase of the field synchronization signal, and a back shoulder phase; the front shoulder phase being the phase from the end of the enable signal's effective level of the previous frame image to the start of the field synchronization signal of the current frame image; the back shoulder phase being the phase from the end of the effective level of the field synchronization signal to the start of the enable signal's effective level of the current frame image; the step of outputting a drive signal to the near-field communication coil during the field blanking phase according to the synchronization signal includes: determining the start time of each drive signal output based on a pre-acquired correspondence between the synchronization signal and the field blanking phase, the start time being within the field blanking phase; and outputting a drive signal within a preset duration starting from the start time. The signal, wherein the preset duration is less than the pre-configured blanking back shoulder duration; the step of determining the start time of each output drive signal according to the pre-acquired correspondence between the synchronization signal and the field blanking stage specifically includes: determining the period duration of the display cycle of the display panel according to the synchronization signal; when the synchronization signal is a field synchronization signal, the period duration of the display cycle is the interval between two adjacent field synchronization signals; when the synchronization signal is a line synchronization signal, determining the period duration of the display cycle of the display panel includes counting the line synchronization signals to determine the period duration of the display cycle of the display panel; determining the period duration of the control cycle of the near-field communication control device according to the period duration of the display cycle and a preset ratio, wherein the period duration of the control cycle is the interval between the start times of two adjacent output drive signals; determining the start time of the first output drive signal according to the pre-acquired correspondence between the synchronization signal and the field blanking stage; determining the start time of each subsequent output drive signal according to the start time of the first output drive signal and the period duration of the control cycle.

7. The near-field communication control method according to claim 6, wherein, The synchronization signal includes a field synchronization signal, and the start time of the i-th output drive signal is the time of the i×N-th effective edge in the field synchronization signal.

8. A display device, wherein, It includes a display panel, a near-field communication coil, and the near-field communication control device according to any one of claims 1-5.

Images