Driving circuit board, display module and display device

Abstract

The application provides a driving circuit board, a display module and a display device. The driving circuit board comprises a circuit board body, a display driving component, a touch component and a cutting unit. The circuit board body has a plurality of conductive layers arranged in layers, and the plurality of conductive layers comprise a top conductive layer. The top conductive layer comprises a first ground part and a second ground part arranged at intervals. The first ground part is connected with the display driving component, and the second ground part is connected with the touch component. The cutting unit is connected in series with the first ground part and the second ground part. The cutting unit is used for cutting the interference path of high-frequency noise between the first ground part and the second ground part to protect the communication signal. The high-frequency noise is noise with a frequency greater than or equal to a preset frequency. Thus, the water wave phenomenon is improved, and the communication signal can be protected.

Description

Technical Field

[0001] This application relates to the field of display product technology, and in particular to a driver circuit board, a display module, and a display device. Background Technology

[0002] A touch display module typically includes a touch display panel and a driver circuit board electrically connected to the touch display panel. The driver circuit board usually houses display driving components and touch components. Specifically, the driver circuit board can control the touch display panel to display images via the display driving components; the driver circuit board can also enable touch functionality on the touch display panel via the touch components, thereby acquiring the user's touch position on the touch display panel.

[0003] However, the display driver components and touch components in the driver circuit board are prone to mutual interference during operation, resulting in poor display and touch performance of the touch display panel. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a driver circuit board, a display module, and a display device.

[0005] Based on the above objectives, the first aspect of this application provides a driving circuit board, including: a circuit board body, a display driving component, a touch component, and a cutting unit; the circuit board body has a plurality of conductive layers stacked together, the plurality of conductive layers including a top conductive layer, the top conductive layer including a first ground portion and a second ground portion spaced apart, the first ground portion being connected to the display driving component, and the second ground portion being connected to the touch component;

[0006] The cutting-off unit is connected in series with the first grounding part and the second grounding part. The cutting-off unit is used to cut off the interference path of high-frequency noise between the first grounding part and the second grounding part to protect the communication signal. The high-frequency noise is noise with a frequency greater than or equal to a preset frequency.

[0007] Optionally, the first grounding portion is disposed around the outer periphery of the second grounding portion, and a gap is provided between the first grounding portion and the second grounding portion. The orthographic projection of the cutting unit on the first plane covers the orthographic projection of the gap on the first plane, and the first plane is a plane parallel to the driving circuit board.

[0008] Optionally, the cutting unit is made of ferrite material.

[0009] Optionally, it also includes a filtering component. The touch component includes a touch chip and multiple touch communication lines. The touch chip is connected to the second grounding part. All the touch communication lines are connected to the touch chip through the filtering component. The filtering component is used to stabilize the reference potential of the communication signal of the touch communication lines.

[0010] Optionally, the filtering component includes multiple sub-filters, and at least one of the sub-filters is provided between each of the touch communication lines and the touch chip.

[0011] Optionally, the sub-filter includes a resistor and a capacitor. The capacitor includes a ground terminal and a connection terminal. The resistor includes a first terminal and a second terminal. The ground terminal is connected to the second grounding part. The connection terminal is connected to the touch chip and the first terminal of the resistor. The second terminal of the resistor is connected to the corresponding touch communication line.

[0012] Optionally, the touch component further includes a touch power line connected to the touch chip, and the driving circuit board further includes an isolation unit disposed between the touch power line and the touch chip. The isolation unit is used to filter noise and interference signals on the touch power line.

[0013] Optionally, the plurality of conductive layers further includes a signal line layer, which is located on the side of the top conductive layer away from the touch component. The driving circuit board further includes touch traces, which are connected to the touch chip. The touch traces are disposed in the signal line layer and the top conductive layer. The touch traces include transmitting traces and receiving traces, and the orthographic projection of the transmitting traces on the first plane does not overlap with the orthographic projection of the receiving traces on the first plane.

[0014] Optionally, the drive circuit board further includes multiple floating traces, with at least one floating trace between adjacent transmitting traces and receiving traces, between two adjacent transmitting traces, and / or between two adjacent receiving traces.

[0015] Optionally, the drive circuit board further includes multiple third grounding portions, with at least one third grounding portion provided between adjacent transmitting and receiving traces, between two adjacent transmitting traces, and / or between two adjacent receiving traces.

[0016] Based on the same inventive concept, a second aspect of this application provides a display module, including: a touch display panel, and a driving circuit board electrically connected to the touch display panel, wherein the driving circuit board is any of the driving circuit boards described in the first aspect above.

[0017] Based on the same inventive concept, a third aspect of this application provides a display device, including the display module described in the second aspect above.

[0018] As can be seen from the above, the driving circuit board, display module, and display device provided in this application, by setting the first ground part and the second ground part separately, ensure that the touch signal generated by the touch component is isolated by the gap between the first ground part and the second ground part. The touch signal will not couple and interfere with the signal of the display driving circuit, thereby ensuring that no coupling interference is transmitted to the display panel. This can fundamentally block the coupling between the touch signal and the display signal and improve the water ripple phenomenon. At the same time, by connecting the first ground part and the second ground part in series through the cut-off unit, the high-frequency noise high-interference path between the first ground part and the second ground part is cut off, thereby eliminating communication errors caused by ground potential fluctuations, protecting the communication signal, and ultimately ensuring the normal operation of the touch system and ensuring that there are no problems such as touch failure or signal disorder. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a top view of the driver circuit board according to an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of the driver circuit board according to an embodiment of this application; Figure 3 This is an exemplary schematic diagram showing the connection between the driver circuit board and the touch display panel according to an embodiment of this application; Figure 4 This is another exemplary schematic diagram showing the connection between the driver circuit board and the touch display panel according to an embodiment of this application; Figure 5 This is an exemplary schematic diagram of the layout of touch control wiring in an embodiment of this application; Figure 6 This is another exemplary schematic diagram of the layout of touch wiring in an embodiment of this application; Figure 7 This is another exemplary schematic diagram of the layout of touch wiring in an embodiment of this application; Figure 8 This is another exemplary schematic diagram of the layout of touch wiring in an embodiment of this application; Figure 9 This is another exemplary schematic diagram of the layout of touch wiring in an embodiment of this application; Figure 10 This is a schematic diagram of a display module according to an embodiment of this application.

[0021] In the diagram: 000, Driver circuit board; 100, Circuit board body; 110, Top conductive layer; 111, First grounding part; 112, Second grounding part; 120, Signal line layer; 130, Other line layers; 140, Bottom conductive layer; 150, Third grounding part; 200, Display driver component; 300, Touch component; 310, Touch chip; 320, Touch communication line; 330, Touch power line; 400, Gap; 500, Cut-off unit; 600, Touch trace; 610, Transmitting trace; 620, Receiving trace; 700, Filtering component; 710, Sub-filter; 800, Display power line; 900, Floating trace; 1000, Isolation unit; 1100, Isolation unit; 001, Touch display panel; 002, Flexible circuit board; 003, Source driver chip; R, Resistor; C, Capacitor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0023] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after 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 only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] It should be noted that, unless otherwise defined, the terms "parallel" and "perpendicular" as used in the embodiments of this application include the described situation and situations similar to the described situation, where the range of similar situations is within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, within 5°.

[0025] In touch-enabled display devices, electromagnetic coupling between touch signals and display driver signals is the core cause of the water ripple effect on the display. When the touch chip is working, its output high-frequency touch signals can couple and interfere with the signals of the display driver circuit through grounding loops, wires, and other paths on the driver circuit board. This interference, when transmitted to the display panel, manifests as visible water ripples, severely affecting the display effect and user experience.

[0026] In related technologies, solutions to improve touch ripple effects mostly revolve around reducing touch signal energy and adjusting the driving frequency of touch chips. Essentially, these solutions reduce the interference of touch signals on display signals by sacrificing touch performance such as touch sensitivity and response speed. They cannot fundamentally solve the coupling problem and have the limitation of not being able to balance touch performance and display effect.

[0027] In addition, some related technologies improve touch coupling by separating the grounding area, that is, separating the system ground (hereinafter referred to as "MGND") and the touch ground (hereinafter referred to as "TGND"), blocking the common ground coupling path between the touch signal and the display signal, which can theoretically suppress water ripples at the source. However, in practical applications, it has been found that the grounding area separation method often results in communication errors, causing the touch system to malfunction, or even causing touch failure, signal disorder, and other problems, making this type of separation solution difficult to apply in practice.

[0028] To address this issue, the inventors of this application discovered that when using a grounding area separation method, MGND shares the same ground with the system, while TGND has an independent ground. This causes interference factors such as high-frequency noise and high-frequency interference to affect both MGND and TGND, resulting in a level difference between them. This can lead to communication errors or inconsistent reference potentials in the communication lines of the touch chip, ultimately causing the touch system to malfunction, or even resulting in touch failure, signal disorder, and other problems.

[0029] Based on this, see Figure 1 and Figure 2 As shown, this application provides a driving circuit board 000, including: a circuit board body 100, a display driving component 200, a touch component 300, and a cutting unit 500; the circuit board body 100 has a plurality of conductive layers stacked together, the plurality of conductive layers including a top conductive layer 110, the top conductive layer 110 including a first ground portion 111 and a second ground portion 112 spaced apart, the first ground portion 111 being connected to the display driving component 200, and the second ground portion 112 being connected to the touch component 300; The cutting-off unit 500 is connected in series with the first grounding part 111 and the second grounding part 112. The cutting-off unit 500 is used to cut off the interference path of high-frequency noise between the first grounding part 111 and the second grounding part 112 to protect the communication signal. The high-frequency noise is noise with a frequency greater than or equal to a preset frequency.

[0030] Specifically, the driver circuit board 000 is provided with a display driver component 200 and a touch component 300. Both the display driver component 200 and the touch component 300 in the driver circuit board 000 can be fixed on the circuit board body 100.

[0031] The driving circuit board 000 can control the touch display panel 001 to display images through the display driving component 200; the driving circuit board 000 can also enable the touch display panel 001 to have touch function through the touch component 300, thereby obtaining the user's touch position on the touch display panel 001.

[0032] The display driver component 200 may include a timing controller (T-con) and a power management IC (PMIC). The timing controller can provide various signals required by the touch display panel 001, such as timing control signals, display data signals, and other control signals (e.g., gate drive signals). The timing controller can also process the display data signals to improve the image quality of the touch display panel 001.

[0033] The power management chip can be used to provide voltage signals to the touch analog front-end module in the source driver chip 003 bonded to the touch display panel 001 or the touch digital back-end module in the timing controller. The power management chip can also provide operating voltage to other units or modules.

[0034] The circuit board body 100 has multiple conductive layers stacked together, including a top conductive layer 110, which is a layer close to the display driving component 200 and the touch component 300.

[0035] The top conductive layer 110 includes a first ground portion 111 and a second ground portion 112 spaced apart. The first ground portion 111 is connected to the display driving component 200, and the second ground portion 112 is connected to the touch component 300. Because the first ground portion 111 and the second ground portion 112 are spaced apart, they are separated, thus separating the display driving component 200 connected to the first ground portion 111 and the touch component 300 connected to the second ground portion 112. That is, the display driving component 200 and the touch component 300 do not share a ground portion. In actual use, the touch signal generated by the touch component 300 is blocked by the gap between the first ground portion 111 and the second ground portion 112, preventing the touch signal from coupling and interfering with the signal of the display driving circuit. This ensures that no coupling interference is transmitted to the display panel, thereby fundamentally blocking the coupling between the touch signal and the display signal and improving the water ripple effect.

[0036] The cutting-off unit 500 is connected in series with the first grounding part 111 and the second grounding part 112. The cutting-off unit 500 is used to cut off the high-frequency noise interference path between the first grounding part 111 and the second grounding part 112 to protect the communication signal. That is, the cutting-off unit 500 is only used to cut off the high-frequency noise interference path between the first grounding part 111 and the second grounding part 112, but in low-frequency or DC conditions, the cutting-off unit 500 can be used as a low-obstruction conduction path.

[0037] Specifically, the function of the cutting-off unit 500 is to cut off the mutual interference path of high-frequency noise between the first grounding part 111 and the second grounding part 112 while allowing different DC potentials, thereby eliminating communication errors caused by ground potential fluctuations, protecting the communication signal, and ultimately ensuring the normal operation of the touch system and preventing problems such as touch failure and signal disorder.

[0038] When there are two independent "grounds" on the driver circuit board 000, namely the first ground part 111 and the second ground part 112, there will be a fluctuating voltage difference between them due to the different current loops. This voltage difference usually comes from power supply noise or high-frequency signal return current, and manifests as high-frequency AC noise. This noise will couple into the signal through the shared ground wire, causing communication level judgment errors, and may even form a "ground loop" that absorbs external interference like an antenna.

[0039] The cutting-off unit 500 is connected in series between the first grounding part 111 and the second grounding part 112, and its core function is as follows: For DC signals: Approximately short circuit. The resistance of the cut-off unit 500 to DC current is very small (typically <1Ω), so the DC potential difference between the first grounding part 111 and the second grounding part 112 remains almost constant.

[0040] For high-frequency noise: it presents high impedance. When high-frequency noise (such as harmonics of communication signals or external interference) attempts to pass through the ground wire, the cut-off unit 500 acts like a variable resistor, exhibiting a large impedance to noise with a frequency greater than or equal to a preset frequency (exemplarily, tens of MHz or above, for example, 50 MHz or 80 MHz). This prevents the high-frequency noise current from flowing freely between the first grounding part 111 and the second grounding part 112, thereby cutting off the mutual interference path of high-frequency noise between them, eliminating communication errors caused by ground potential fluctuations, and thus protecting the communication signal.

[0041] In this application, by setting the first grounding part 111 and the second grounding part 112 at intervals, the touch signal generated by the touch component 300 is isolated by the interval between the first grounding part 111 and the second grounding part 112. The touch signal will not couple and interfere with the signal of the display driving circuit, thereby ensuring that no coupling interference is transmitted to the display panel. This can block the coupling between the touch signal and the display signal at the source and improve the water ripple phenomenon. At the same time, by connecting the first grounding part 111 and the second grounding part 112 in series through the cutting unit 500, the high-frequency noise high-interference path between the first grounding part 111 and the second grounding part 112 is cut off, thereby eliminating communication errors caused by ground potential fluctuations, protecting the communication signal, and ultimately ensuring the normal operation of the touch system and ensuring that there are no problems such as touch failure or signal disorder.

[0042] Optionally, the cutting unit 500 is made of ferrite material. The unique composition of the cutting unit 500 (ferrite material) causes its high impedance portion to exhibit resistive characteristics. This means that instead of reflecting energy back like an inductor, it directly converts high-frequency noise energy into heat and dissipates it.

[0043] For example, the cutting-off unit 500 can be a ferrite bead. The ferrite bead can be a surface-mount ferrite bead with a 0603 package and a specification of 100Ω / 100MHz, which is connected in series at the connection node of the first ground part 111 and the second ground part 112 to suppress high-frequency interference crosstalk between the first ground part 111 and the second ground part 112, and further enhance the isolation effect of the first ground part 111 and the second ground part 112 on the basis of the spacing.

[0044] In some embodiments, see continue to see Figure 1 As shown, the first grounding part 111 is disposed around the outer periphery of the second grounding part 112, and a gap 400 is provided between the first grounding part 111 and the second grounding part 112. The orthographic projection of the cutting unit 500 on the first plane covers the orthographic projection of the gap 400 on the first plane. The first plane is a plane parallel to the drive circuit board 000.

[0045] Specifically, the first grounding part 111 is disposed around the outer periphery of the second grounding part 112, and a gap 400 is provided between the first grounding part 111 and the second grounding part 112. The orthographic projection of the cutting unit 500 on the first plane covers the orthographic projection of the gap 400 on the first plane. In this way, the cutting unit 500 is exactly positioned at the gap 400 between the first grounding part 111 and the second grounding part 112, thereby ensuring the series connection function of the cutting unit 500 for the first grounding part 111 and the second grounding part 112.

[0046] Meanwhile, the cutting-off unit 500 is positioned precisely at the gap 400 between the first grounding part 111 and the second grounding part 112. Based on the fact that the gap 400 can block the first grounding part 111 and the second grounding part 112, the high-frequency noise interference path is further blocked at the gap 400 position, thereby protecting the communication signal.

[0047] Optionally, the width of the gap is 400 (i.e. Figure 1 The width of the gap 400 (as shown in the middle H) is greater than or equal to 1.27 mm and less than 5 mm. The width of the gap 400 is greater than or equal to 1.27 mm, which makes the width between the first grounding part 111 and the second grounding part 112 sufficiently large, so as to achieve effective isolation between the first grounding part 111 and the second grounding part 112, providing a basic guarantee for stable transmission of touch signals and improvement of water ripple.

[0048] At the same time, the width of the gap 400 is less than 5mm. While ensuring effective isolation, the gap 400 is not too wide, which makes the area occupied by the gap 400 small and does not waste too much area of ​​the drive circuit board 000, thereby increasing the effective usable area of ​​the drive circuit board 000.

[0049] In some embodiments, see Figure 3 As shown, the driving circuit board also includes a filter component 700. The touch component 300 includes a touch chip 310 and multiple touch communication lines 320. The touch chip 310 is connected to the second grounding part 112. All the touch communication lines 320 are connected to the touch chip 310 through the filter component 700. The filter component 700 is used to stabilize the reference potential of the communication signal of the touch communication lines 320.

[0050] Specifically, the touch chip 310 can be used to provide touch driving signals, and can determine the user's touch position on the touch display panel 001 based on the provided touch driving signals and the received touch sensing signals. The multiple touch communication lines 320 are used to transmit touch signals.

[0051] All of the aforementioned touch communication lines 320 are connected to the touch chip 310 through the filter component 700. Thus, a filter component 700 is provided between the touch chip 310 and the touch communication lines 320. The filter component 700 filters out noise and interference in the touch communication lines 320 through filtering, thereby stabilizing the reference potential of the communication signal of the touch communication lines 320, ensuring the communication stability of the touch communication lines 320, and thus improving the communication stability of the touch signal and the overall touch stability.

[0052] In some embodiments, see continue to see Figure 3 As shown, the filtering component 700 includes multiple sub-filters 710. At least one sub-filter 710 is provided between each touch communication line 320 and the touch chip 310. Thus, at least one sub-filter 710 can be used to stabilize the communication signal reference potential of the corresponding touch communication line 320, ensuring the communication stability of the touch communication line 320, and thereby ensuring the communication stability of each touch communication line 320.

[0053] In some embodiments, the sub-filter 710 includes a resistor R and a capacitor C. The capacitor C includes a ground terminal and a device terminal. The resistor R includes a first terminal and a second terminal. The ground terminal is connected to the second ground portion 112. The device terminal is connected to the touch chip 310 and the first terminal of the resistor R. The second terminal of the resistor R is connected to the corresponding touch communication line 320.

[0054] Specifically, the resistor R of each sub-filter 710 can be selected as a resistor of 100Ω-1kΩ, and the capacitor C can be selected as a capacitor of 10nF-100nF, both of which are surface-mount components. The resistor R is connected in series in the touch communication line 320, and one end of the capacitor C is connected to the node between the touch communication line 320 and the resistor R, and the other end is connected to the second ground part 112. In this way, the filtering effect of the sub-filter 710 is used to filter out noise, thereby stabilizing the reference potential of the communication signal of the corresponding touch communication line 320.

[0055] Sub-filter 710 can be an RC filter, whose core function is to "selectively pass or block signals," that is, to filter out unwanted frequency components and retain or improve the desired signals. Capacitor C acts like a "frequency switch," with different impedances for different frequencies. Resistor R is used to control the charging and discharging speed and limit current; together, they constitute a basic frequency filtering device.

[0056] An RC filter has low-pass filtering characteristics and is used to smooth voltage and suppress noise. In the touch communication circuit 320, the RC filter filters out high-frequency noise, thereby improving the anti-interference capability of the touch communication circuit 320 and stabilizing the reference potential of the corresponding touch communication signal.

[0057] In some embodiments, see Figure 4 As shown, the touch component 300 also includes a touch power line 330, which is connected to the touch chip 310. The drive circuit board 000 also includes an isolation unit 1000, which is disposed between the touch power line 330 and the touch chip 310. The isolation unit 1000 is used to filter noise and interference signals on the touch power line 330.

[0058] Specifically, the isolation unit 1000 can be a ferrite bead. The ferrite bead can be a surface-mount ferrite bead with a 0603 package and a specification of 60Ω / 100MHz. It is soldered between the power input terminal of the touch power line 330 and the power pin of the touch chip 310. Its core function is to prevent high-frequency noise and interference signals in the touch power line 330 from being conducted to the touch chip 310 through the power line, thus preventing the touch signal from being interfered with. At the same time, it protects the touch chip 310 from damage by power noise and ensures the stable operating voltage of the touch chip 310.

[0059] The driving circuit board also includes a display power line 800, which includes a source voltage power line and a drain voltage power line. The source voltage power line and the drain voltage power line are connected to the touch display panel 001 and the display driving component 200. An isolation unit 1100 is provided between the source voltage power line and the drain voltage power line and the display driving component 200. The isolation unit 1100 is used to filter noise and interference signals on the display power line 800, prevent noise from being conducted to the display driving component 200 through the display power line 800, prevent the display driving signal from being interfered with, and protect the display driving component 200 from power noise damage, ensuring the stable operating voltage of the display driving component 200.

[0060] The isolation unit 1100 can be a magnetic bead, which can be a surface-mount magnetic bead with a 0603 package and a specification of 60Ω / 100MHz, and is soldered between the power input terminal of the display power line 800 and the power pin of the display driver component 200.

[0061] In some embodiments, see Figure 2 and Figure 5As shown, the plurality of conductive layers further includes a signal line layer 120, which is located on the side of the top conductive layer 110 away from the touch component 300. The driving circuit board 000 also includes a touch trace 600, which is connected to the touch chip 310. The touch trace 600 is disposed in the signal line layer 120 and the top conductive layer 110. The touch trace 600 includes a transmitting trace 610 and a receiving trace 620. The orthographic projection of the transmitting trace 610 on the first plane and the orthographic projection of the receiving trace 620 on the first plane do not overlap.

[0062] Specifically, the second grounding portion 112 is isolated from the other layers among the plurality of conductive layers, making the second grounding portion 112 an independent touch grounding area. This area is only used for grounding the touch chip 310, touch-related devices, and touch signal-related lines, and is completely isolated from the grounding areas of other layers. This prevents noise from other layers from being conducted to the second grounding portion 112 through the ground layer, ensuring the purity of the second grounding portion 112 and reducing the interference of noise on the touch signal.

[0063] The signal line layer 120 is located on the side of the top conductive layer 110 away from the touch component 300. The driving circuit board 000 also includes a touch trace 600, which is connected to the touch chip 310. The touch trace 600 is insulated in the signal line layer 120 and the top conductive layer 110. The touch trace 600 includes a transmitting trace 610 and a receiving trace 620. The orthographic projection of the transmitting trace 610 on the first plane and the orthographic projection of the receiving trace 620 on the first plane do not overlap. Thus, on the driving circuit board 000, the transmitting trace 610 and the receiving trace 620 do not overlap, which can ensure that the transmitting trace 610 and the receiving trace 620 will not be capacitively coupled, thereby ensuring that there will be no abnormal touch signal.

[0064] It is worth noting that the non-overlapping transmit traces 610 and receive traces 620 referred to in this application both refer to the touch traces 600 on the driver circuit board 000. For the entire display module, it also includes the touch traces 600 located in the display area. The orthographic projections of the transmit traces 610 and receive traces 620 of the touch traces 600 located in the display area on the display panel at least partially overlap to ensure the normal transmission of touch signals.

[0065] The plurality of conductive layers also include at least one other circuit layer 130, which is disposed on the side of the signal circuit layer 120 away from the touch component 300. The other circuit layer 130 has signal transmission lines distributed thereon, which can be connected to various components disposed on the circuit board body 100. For example, these signal transmission lines can be connected to the display driving component 200 and the touch component 300, and signal transmission between the display driving component 200 and the touch display panel 001, as well as between the touch component 300 and the touch display panel 001, can be realized through these signal transmission lines.

[0066] The plurality of conductive layers may further include a bottom conductive layer 140 located on the side of the signal line layer 120 opposite to the top conductive layer 110. That is, the bottom conductive layer 140 may be the conductive layer furthest from the display driving component 200 and the touch component 300 among the plurality of conductive layers, and this bottom conductive layer 140 may be distributed on the substrate and in contact with the substrate. In one possible implementation, the bottom conductive layer 140 may serve as a signal shielding layer in the circuit board body 100 to shield against interference from external electromagnetic signals.

[0067] In some embodiments, see continue to see Figure 5 As shown, the drive circuit board 000 also includes multiple floating traces 900, with at least one floating trace 900 provided between adjacent transmitting traces 610 and receiving traces 620, between two adjacent transmitting traces 610, and / or between two adjacent receiving traces 620.

[0068] Specifically, the floating trace 900 refers to a trace that does not transmit signals, and can also be called an empty trace.

[0069] In this application, at least one floating trace 900 is provided between adjacent transmitting traces 610 and receiving traces 620, between two adjacent transmitting traces 610, and / or between two adjacent receiving traces 620. The floating trace 900 can further isolate capacitive coupling and signal interference between adjacent transmitting traces 610 and receiving traces 620, between two adjacent transmitting traces 610, and between two adjacent receiving traces 620, thereby ensuring that no abnormal touch signal occurs.

[0070] For example, there may be only one floating line 900 between adjacent transmit lines 610 and receive lines 620, between two adjacent transmit lines 610, and / or between two adjacent receive lines 620, or there may be multiple floating lines 900.

[0071] Optionally, at least two floating traces 900 are provided between adjacent transmitting traces 610 and receiving traces 620, and one floating trace 900 is provided between each pair of adjacent transmitting traces 610 and each pair of adjacent receiving traces 620 to isolate capacitive coupling between adjacent traces. Simultaneously, since the transmitting traces 610 and receiving traces 620 must be tightly isolated to ensure the normal operation of the touch signal, at least two floating traces 900 are provided between adjacent transmitting traces 610 and receiving traces 620 to ensure the isolation effect.

[0072] In some embodiments, see Figure 6 As shown, the driving circuit board 000 also includes a plurality of third grounding portions 150, and at least one third grounding portion 150 is provided between adjacent transmitting traces 610 and receiving traces 620, between two adjacent transmitting traces 610, and / or between two adjacent receiving traces 620.

[0073] Specifically, the third grounding part 150 can be connected to the first grounding part 111.

[0074] At least one third grounding portion 150 is provided between adjacent transmitting lines 610 and receiving lines 620, between two adjacent transmitting lines 610, and / or between two adjacent receiving lines 620. This allows interference signals between adjacent transmitting lines 610 and receiving lines 620, between two adjacent transmitting lines 610, and / or between two adjacent receiving lines 620 to be transmitted to the third grounding portion 150 and then released to ground by the third grounding portion 150, thereby ensuring sufficient isolation between adjacent lines and preventing abnormal touch signals.

[0075] Optionally, see Figure 7 , Figure 8 and Figure 9 As shown, for a trace (e.g., transmit trace 610 or receive trace 620), a floating trace 900 is provided on each side of the trace. A third grounding part 150 is provided on the side of the floating trace 900 away from the trace. In this way, through the dual function of the floating trace 900 and the third grounding part 150, the capacitive coupling and signal interference between adjacent transmit traces 610 and receive traces 620, between two adjacent transmit traces 610 and between two adjacent receive traces 620 are completely isolated, thereby ensuring that there will be no abnormal touch signal.

[0076] In this application, by separating the first ground part 111 and the second ground part 112 on the driver circuit board 000, the common ground coupling path between the touch signal and the display signal is completely blocked, which suppresses the display ripple phenomenon caused by touch operation from the root cause. The improvement effect is significant, and there is no need to reduce the touch signal energy or adjust the driving frequency. Touch sensitivity, response speed and other touch performance are not sacrificed at all. The dual optimization of display effect and touch performance is achieved, and the user experience is improved.

[0077] Meanwhile, a disconnection unit 500 is connected in series between the first grounding part 111 and the second grounding part 112. The disconnection unit 500 can effectively suppress high-frequency interference crosstalk between the two grounding areas, further isolate the touch signal and the display drive signal, avoid the recurrence of water ripples caused by high-frequency noise coupling, and at the same time, it does not affect the independent operation of the two groundings, strengthen the anti-interference effect of grounding separation, and ensure normal communication signals.

[0078] Furthermore, to address the communication errors caused by the separation of the first grounding part 111 and the second grounding part 112, a sub-filter 710 is configured on each communication line (such as SDA, SCL, INT, Reset, etc.) of the touch chip 310. The filtering effect of the sub-filter 710 filters out noise and high-frequency noise, ensuring stable transmission of communication signals. This effectively solves the communication anomaly caused by the separation of grounding parts, ensures the normal operation of the touch system, and enables the grounding separation solution to be practically applied.

[0079] In addition, an isolation unit 1000 is added at the touch power line 330. The isolation unit 1000 can filter high-frequency noise and interference signals in the power line, prevent noise from being conducted to the touch chip 310 through the power line, prevent the touch signal from being interfered with, further improve the stability and anti-interference capability of the touch system, and protect the touch chip 310 from power noise damage.

[0080] This application boasts a simple and cost-effective process, requiring no additional complex hardware. It only necessitates optimizing the grounding layout during the design phase of the driver circuit board 000, adding a filter component 700 to the communication line, and simultaneously adding a blocking unit between the first grounding part 111 and the second grounding part 112, and an isolation unit 1000 to the touch power line 330. The blocking and isolation units 1000 are easy to select and inexpensive, requiring no significant modifications to existing touch and display systems, and exhibit strong compatibility. Furthermore, the addition of the blocking and isolation units 1000 does not increase the layout complexity of the driver circuit board 000, nor does it affect the overall thinning requirements. It is suitable for various touch-enabled display devices (such as mobile phones, tablets, and monitors), possessing broad application prospects and high commercial value.

[0081] See Figure 10As shown, this application also provides a display module, including: a touch display panel 001, and a driving circuit board 000 electrically connected to the touch display panel 001, wherein the driving circuit board 000 is the driving circuit board 000 described in any of the above embodiments.

[0082] Specifically, the display module may further include a flexible circuit board 002. The flexible circuit board 002 can be bonded to the touch display panel 001, and the driving circuit board 000 can be electrically connected to the touch display panel 001 through the flexible circuit board 002.

[0083] In this application, the display module may further include a source driver chip 003 bonded to a non-display area of ​​the touch display panel 001. The driver circuit board 000 can drive and control the source driver chip 003, so that the source driver chip 003 can drive the touch display panel 001 to display an image.

[0084] In some embodiments, the flexible circuit board 002 can be bent to the back of the touch display panel 001, resulting in a higher screen-to-body ratio on the front of the touch display panel 001.

[0085] In some embodiments, the portion of the touch display panel 001 located in the non-display area can be bent to the back of the touch display panel 001, so that the source driver chip 003, the flexible circuit board 002 and the driver circuit board 000 can all be distributed on the back of the touch display panel 001, which can further improve the screen ratio of the front of the touch display panel 001.

[0086] This application also provides a display device, including the display module described in any of the above embodiments.

[0087] The display device includes a main control component and a display module electrically connected to the main control component. Here, the display module may include the display module shown above, the main control component may be a motherboard, and the main control component may be connected to the driver circuit board 000 in the display module via a connection circuit board.

[0088] The display device can be a product with image display function, such as: monitor, television, billboard, digital photo frame, laser printer with display function, telephone, mobile phone, personal digital assistant (PDA), digital camera, portable camcorder, viewfinder, navigator, vehicle, large wall area, home appliance, information query equipment (such as business query equipment of e-government, bank, hospital, power and other departments, monitor, etc.).

[0089] The display device has the technical effects described in any of the above embodiments, which will not be elaborated here.

[0090] It should be noted that the above description describes some embodiments of this application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in a different order than that shown in the above embodiments and still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require a specific or sequential order to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0091] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application is limited to these examples; under the concept of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0092] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A driving circuit board, characterized in that, include: The circuit board body comprises a display driver component, a touch component, and a cutting unit. The circuit board body has multiple conductive layers stacked together, including a top conductive layer. The top conductive layer includes a first ground portion and a second ground portion spaced apart. The first ground portion is connected to the display driver component, and the second ground portion is connected to the touch component. The cutting-off unit is connected in series with the first grounding part and the second grounding part. The cutting-off unit is used to cut off the interference path of high-frequency noise between the first grounding part and the second grounding part to protect the communication signal. The high-frequency noise is noise with a frequency greater than or equal to a preset frequency.

2. The driving circuit board according to claim 1, characterized in that, The first grounding portion is disposed around the outer periphery of the second grounding portion, and a gap is provided between the first grounding portion and the second grounding portion. The orthographic projection of the cutting unit on the first plane covers the orthographic projection of the gap on the first plane, and the first plane is a plane parallel to the driving circuit board.

3. The driving circuit board according to claim 1, characterized in that, The cutting unit is made of ferrite material.

4. The driving circuit board according to claim 1, characterized in that, It also includes a filtering component. The touch component includes a touch chip and multiple touch communication lines. The touch chip is connected to the second grounding part. All the touch communication lines are connected to the touch chip through the filtering component. The filtering component is used to stabilize the reference potential of the communication signal of the touch communication lines.

5. The driving circuit board according to claim 4, characterized in that, The filtering component includes multiple sub-filters, and at least one of the sub-filters is provided between each of the touch communication lines and the touch chip.

6. The driving circuit board according to claim 5, characterized in that, The sub-filter includes a resistor and a capacitor. The capacitor includes a ground terminal and a connection terminal. The resistor includes a first terminal and a second terminal. The ground terminal is connected to the second grounding part. The connection terminal is connected to the touch chip and the first terminal of the resistor. The second terminal of the resistor is connected to the corresponding touch communication line.

7. The driving circuit board according to claim 4, characterized in that, The touch component also includes a touch power line connected to the touch chip. The driving circuit board also includes an isolation unit disposed between the touch power line and the touch chip. The isolation unit is used to filter noise and interference signals on the touch power line.

8. The driving circuit board according to claim 1, characterized in that, The plurality of conductive layers further includes a signal line layer, which is located on the side of the top conductive layer away from the touch component. The driving circuit board further includes touch traces, which are connected to the touch chip. The touch traces are disposed in the signal line layer and the top conductive layer. The touch traces include transmitting traces and receiving traces. The orthographic projection of the transmitting trace on the first plane and the orthographic projection of the receiving trace on the first plane do not overlap.

9. The driving circuit board according to claim 8, characterized in that, The drive circuit board also includes multiple floating traces, with at least one floating trace between adjacent transmitting traces and receiving traces, between two adjacent transmitting traces, and / or between two adjacent receiving traces.

10. The driving circuit board according to claim 8, characterized in that, The driving circuit board also includes multiple third grounding portions, with at least one third grounding portion provided between adjacent transmitting and receiving traces, between two adjacent transmitting traces, and / or between two adjacent receiving traces.

11. A display module, characterized in that, include: A touch display panel and a driving circuit board electrically connected to the touch display panel, wherein the driving circuit board is the driving circuit board according to any one of claims 1 to 10.

12. A display device, characterized in that, Includes the display module as described in claim 11.

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