Display modules and display devices

Abstract

This application provides a display module and display device, relating to the field of display technology. The display module includes a display panel, a first touch chip, a second touch chip, a first clock generator, and a second clock generator. The display panel includes a display substrate and a touch layer stacked on the display substrate. The first touch chip and the second touch chip are both electrically connected to the touch layer and are used to drive the touch layer. The first clock generator is electrically connected to the first touch chip and is used to send a first clock signal to the first touch chip. The second clock generator is electrically connected to the second touch chip and is used to send a second clock signal to the second touch chip. This can improve the consistency of the reference clock signals of the first touch chip and the second touch chip.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display module and a display device. Background Technology

[0002] As display size increases and touch accuracy improves, display modules typically need to be equipped with at least two touch chips. However, the clock consistency between the two touch chips is poor, which affects the touch experience. Summary of the Invention

[0003] Embodiments of this application provide a display module and a display device for improving clock consistency between two touch chips.

[0004] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0005] On the one hand, a display module is provided, including a display panel, a first touch chip, a second touch chip, a first clock generator, and a second clock generator;

[0006] The display panel includes a display substrate and a touch layer stacked on the display substrate;

[0007] Both the first touch chip and the second touch chip are electrically connected to the touch layer and are used to drive the touch layer;

[0008] The first clock generator is electrically connected to the first touch chip and is used to send a first clock signal to the first touch chip; the second clock generator is electrically connected to the second touch chip and is used to send a second clock signal to the second touch chip.

[0009] In some embodiments, the first touch chip and the first clock generator are connected to a first side of the display panel, and the second touch chip and the second clock generator are connected to a second side of the display panel, with the first side and the second side facing each other.

[0010] In some embodiments, the system further includes a display driver board connected to the first side and a touch driver board connected to the second side, wherein the first touch chip and the first clock generator are disposed on the display driver board, and the second touch chip and the second clock generator are disposed on the touch driver board.

[0011] In some implementations, the trace length between the first touch chip and the first clock generator is a first length, and the trace length between the second touch chip and the second clock generator is a second length, wherein the first length is equal to the second length.

[0012] In some implementations, the first touch chip and the second touch chip are electrically connected to enable handshaking between the first touch chip and the second touch chip.

[0013] In some implementations, when the first touch chip receives the first clock signal, it sends a first clock synchronization confirmation signal to the second touch chip, and when the second touch chip receives the second clock signal, it sends a second clock synchronization confirmation signal to the first touch chip.

[0014] In some implementations, the first clock generator and / or the second clock generator are active crystal oscillators; or, the first clock generator and / or the second clock generator are passive crystal oscillators.

[0015] In some embodiments, the touch layer includes a first touch layer that receives a touch signal from a first area and a second touch layer that receives a touch signal from a second area. The first touch layer and the second touch layer are disconnected. The first touch chip is electrically connected to the first touch layer, and the second touch chip is electrically connected to the second touch layer.

[0016] On the other hand, a display device is provided, including the aforementioned display module.

[0017] In some embodiments, the display module includes a display driver board and a touch driver board, and the display device further includes a motherboard electrically connected to the display driver board and the touch driver board;

[0018] The first touch chip and the first clock generator are disposed on the display driver board, and the second touch chip and the second clock generator are disposed on the touch driver board;

[0019] The first clock generator and the second clock generator are active crystal oscillators; the motherboard and the display driver board form a first circuit that sends an oscillation signal to the first clock generator; the motherboard and the touch driver board form a second circuit that sends an oscillation signal to the second clock generator.

[0020] The first circuit and the second circuit have the same load capacitance and impedance.

[0021] In this embodiment, the clock generator includes a first clock generator and a second clock generator. The first clock generator is electrically connected to a first touch chip and is used to send a first clock signal to the first touch chip. The second clock generator is electrically connected to a second touch chip and is used to send a second clock signal to the second touch chip. In this way, the first clock generator can be placed close to the first touch chip without considering the trace length between the first clock generator and the second touch chip, thereby reducing the trace length of the first clock generator and the first touch chip, and reducing signal attenuation and interference. Similarly, the second clock generator can be placed close to the second touch chip, thereby reducing the trace length between the second clock generator and the second touch chip. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a display module with horizontal screen routing.

[0024] Figure 2 A schematic diagram of a vertical screen wiring display module;

[0025] Figures 3 to 5 This is a partial structural diagram of a display device in related technologies;

[0026] Figures 6 to 8 This is a partial structural schematic diagram of the display device provided in the embodiments of this application;

[0027] Figure 9 and Figure 10 This is a signal transmission diagram of a display device provided in an embodiment of this application.

[0028] Figure label:

[0029] 1-First touch chip; 2-Second touch chip; 3-Clock generator; 4-T-con; 5-First clock generator; 6-Second clock generator;

[0030] 10-Display panel; 20-Display driver board; 21-First display driver board; 22-Second display driver board; 23-Flexible circuit; 30-Crystal-coated film; 40-Touch driver board; 50-First motherboard; 60-Second motherboard. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] In the embodiments of this application, the terms "first", "second", "third", "fourth" are used to distinguish the same or similar items with essentially the same function and effect, only for the purpose of clearly describing the technical solution of the embodiments of this application, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

[0033] In the embodiments of this application, "multiple" means two or more, and "at least one" means one or more, unless otherwise explicitly defined.

[0034] In the embodiments of this application, the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] With the development of display technology, OLED displays have been widely used in small-sized display products such as mobile phones and wearable devices due to their advantages such as high color gamut, thinness, and flexibility, and are gradually being used in medium and large-sized (≥16 inch) display products such as laptops and tablets.

[0036] This application provides a display device, which can be a mobile phone, laptop computer, ultra-large mobile personal computer (UMPC), netbook, personal digital assistant (PDA), wearable device, virtual reality device, or other mobile computing device that includes a display module. This application does not limit the scope of the application to this type of device. For ease of description, this application uses a laptop computer as an example.

[0037] The display module may include a display panel, and the display substrate has multiple sub-pixels arranged in an array. During operation, the multiple sub-pixels cooperate to display images. The display substrate may include a light-emitting layer, an anode layer, a cathode layer, an encapsulation layer, a data line layer, etc. This application does not limit the specific structure of the display substrate.

[0038] The display panel also includes a touch layer stacked on the display substrate. The touch layer can be capacitive touch, external, or an integral structure with the display substrate (Flexible Multi-Layer OnCell, or FMLOC for short).

[0039] The touch layer may include touch electrode channels, such as a driving electrode channel Tx and a sensing electrode channel Rx, which receive the user's touch signals through the cooperation of the driving electrode channel and the sensing electrode channel.

[0040] Due to the large size of the display module and the high touch precision required, a first touch chip and a second touch chip need to be cascaded to drive all driving electrode channels Tx and sensing electrode channels Rx. The first touch chip can act as the master touch chip (MasterIC), and the second touch chip can act as the slave touch chip (SlaveIC). The two touch chips need to be synchronized during operation, therefore a clock generator (e.g., a crystal oscillator) is also provided. The clock generator is electrically connected to the MasterIC and SlaveIC via wiring to provide a high-precision clock signal.

[0041] A crystal oscillator is a high-precision and high-stability oscillator widely used in various electronic devices and communication systems. Crystals are commonly used as frequency generators to produce clock signals for electronic devices and provide reference signals for specific systems. Crystal oscillators include active and passive types. Conventional active crystal oscillators can support a load capacitance of ≤60pF. Excessive load capacitance in the crystal oscillator's output signal can lead to clock signal attenuation, severely affecting chip level recognition. The trace length between the crystal oscillator and the touch chip is positively correlated with the load capacitance; that is, the longer the trace, the larger the load capacitance. Typically, with standard trace widths and considering electromagnetic shielding, the trace length between the crystal oscillator and the touch chip needs to be controlled within 20cm. In practical applications, to ensure the reliability of the clock signal, the crystal oscillator is usually placed near the touch chip to avoid crosstalk from other signals and reduce signal attenuation and distortion.

[0042] The display module may also include a display driver board and a touch driver board. For example, the display driver board is connected to one side of the display panel, and the touch driver board is connected to the opposite side. The display driver board can be connected to the bonding area of ​​the display panel via a chip-on-film (COF) film.

[0043] Figure 1 This is a schematic diagram of a display module with horizontal wiring. Figure 2 This is a schematic diagram of a vertical screen display module with wiring. For example... Figure 1 and Figure 2As shown, display modules typically have two wiring schemes: landscape wiring scheme and portrait wiring scheme.

[0044] like Figure 1 As shown, when a horizontal screen routing scheme is adopted, the display driver board 20 is connected to the left side of the display panel 10. When the display module needs to be folded along the dotted line shown in the figure, the display driver board 20 includes a first display driver board 21 and a second display driver board 22. The first display driver board 21 and the second display driver board 22 are electrically connected through a flexible circuit 23, thereby realizing the relative folding of the first display driver board 21 and the second display driver board 22.

[0045] like Figure 2 As shown, when a vertical screen wiring scheme is adopted, the display driver board 20 is connected to the lower edge of the display panel 10. When the display module needs to be folded along the dotted line shown in the figure, since the entire display driver board 20 is located on one side of the dotted line, the display driver board 20 does not need to be folded. Therefore, it is not necessary to set up the display driver board 20 as two pieces and connect them through flexible circuitry, making the structure of the display driver board 20 simpler.

[0046] Therefore, when the display module is foldable, a vertical screen routing scheme is usually chosen, meaning all display signal traces are led out from the short side of the lower or upper side of the display panel 10. This application embodiment uses a vertical screen routing scheme for the display module as an example.

[0047] The display device may also include a motherboard, which can house multiple electronic unit modules, such as a CPU, graphics card, memory, power supply module, clock module, interface circuits, and network module. The motherboard can be electrically connected to the display driver board 20 and the touch driver board 40 via flexible circuitry.

[0048] Figure 3 This is a schematic diagram of the structure of a display device in the related art, such as... Figure 3 As shown, a second touch chip 2 is provided on the touch driver board 40, a first touch chip 1 is provided on the display driver board 20, and a clock generator 3 is disposed on the touch driver board 40. At this time, the trace length between the clock generator 3 and the second touch chip 2 is relatively short, while the trace length between the clock generator 3 and the first touch chip 1 is relatively long, as the clock generator 3 is connected to the motherboard and the display driver board 20.

[0049] Figure 4 This is a schematic diagram of the structure of another display device in the related technology, such as... Figure 4 As shown, the touch driver board 40 has a second touch chip 2, the display driver board 20 has a first touch chip 1, and the clock generator 3 is mounted on the display driver board 20. In this case, the trace length between the clock generator 3 and the first touch chip 1 is relatively short, while the trace length between the clock generator 3 and the second touch chip 2 is relatively long, as the clock generator 3 is connected to the second touch chip 2 via the motherboard and the touch driver board 40.

[0050] Figure 5 This is a schematic diagram of the structure of another display device in the related technology, such as... Figure 5 As shown, the touch driver board 40 has a second touch chip 2, and the display driver board 20 has a first touch chip 1. The clock generator 3 is mounted on the motherboard. By adjusting the position of the clock generator 3 on the motherboard, the trace lengths of the clock generator 3, the first touch chip 1, and the second touch chip 2 can be made equal. However, at this time, the clock generator 3 is far away from both the first touch chip 1 and the second touch chip 2, and the clock generator 3 is located behind the motherboard. Since the motherboard is equipped with various electronic units, these electronic units will generate a large number of high-frequency signals that interfere with the clock signal, causing signal attenuation and waveform distortion.

[0051] Therefore, in this embodiment, the clock generator includes a first clock generator 5 and a second clock generator 6. The first clock generator 5 is electrically connected to the first touch chip 1 and is used to send a first clock signal to the first touch chip 1. The second clock generator 6 is electrically connected to the second touch chip 2 and is used to send a second clock signal to the second touch chip 2. In this way, the first clock generator 5 can be placed close to the first touch chip 1 without considering the trace length between the first clock generator 5 and the second touch chip 2, thereby reducing the trace length of the first clock generator 5 and the first touch chip 1, and reducing signal attenuation and interference. Similarly, the second clock generator 6 can be placed close to the second touch chip 2, thereby reducing the trace length between the second clock generator 6 and the second touch chip 2.

[0052] Because OLED display modules are relatively thin, the touch electrode channels are very close to the OLED cathode, which can easily lead to large Cp Loading and RC Loading of the touch. To reduce the Cp Loading and RC Loading of the touch, while also considering the ultra-narrow bezel requirements of the display device, the display module typically needs to simultaneously bring out the traces of the touch layer's driving electrode channel Tx and sensing electrode channel Rx on two opposite sides. For example, the display module includes a first side and a second side, the trace of the touch electrode channel brought out on the first side is called the first trace, and the trace of the touch electrode channel brought out on the second side is called the second trace. The first touch chip 1 is connected to the first side of the display panel 10 through the first trace, and the second touch chip 2 is connected to the second side of the display panel 10 through the second trace.

[0053] At this time, the first clock generator 5 can be located on the first side of the display panel 10 to reduce the trace length between the first clock generator 5 and the first touch chip 1; the second clock generator 6 can be located on the second side of the display panel 10 to reduce the trace length between the second clock generator 6 and the second touch chip 2.

[0054] Furthermore, since touch electrode channels of the touch layer are led out from both the first and second opposite sides of the display panel 10, the Cp Loading and RC Loading of the touch are reduced.

[0055] For example, the first side and the second side can be the two short sides of the display panel 10. Because the short sides are shorter, the trace length between the first touch chip 1 and the first clock generator 5, which are simultaneously connected to the short sides, is shorter, thus reducing clock signal attenuation. Of course, the first side and the second side can also be the two long sides of the display panel 10; in this case, the clock signal attenuation can be reduced by decreasing the distance between the first touch chip 1 and the first clock generator 5. Similarly, the clock signal attenuation of the second touch chip 2 and the second clock generator 6 can also be reduced.

[0056] It is understandable that the first and second sides can also be two adjacent sides of the display panel 10, which can also reduce the trace length between the clock generator and the touch chip.

[0057] like Figure 6 and Figure 7 As shown, when the display module includes a display driver board 20 connected to the first side and a touch driver board 40 connected to the second side, the first touch chip 1 and the first clock generator 5 can be disposed on the display driver board 20, and the second touch chip 2 and the second clock generator 6 can be disposed on the touch driver board 40.

[0058] By placing the first touch chip 1 and the first clock generator 5 on the display driver board 20, a separate control board is not required, making the display module structure more compact. Furthermore, compared to the motherboard, the display driver board 20 and the touch driver board 40 have fewer high-frequency signals. Placing the clock generator on the display driver board 20 or the touch driver board 40 reduces interference from high-frequency signals to the clock signal, improving reliability.

[0059] For example, such as Figure 6 and Figure 7 As shown, the display driver board 20 is connected to the short side of the lower side of the display panel 10 via a flip-chip film 30, and the touch driver board 40 is connected to the short side of the upper side of the display panel 10 via a flexible circuit. Both the display driver board 20 and the touch driver board 40 are bent to the back of the display panel 10 to reduce the size of the bezel of the display device.

[0060] The circuit length between the first touch chip 1 and the first clock generator 5 is a first length, and the circuit length between the second touch chip 2 and the second clock generator 6 is a second length. The first length can be equal to the second length. When the first length is equal to the second length, the transmission distance of the first clock signal emitted by the first clock generator 5 is the same as the transmission distance of the second clock signal emitted by the second clock generator 6, that is, the transmission time is the same, which can improve the timing consistency of the first touch chip 1 and the second touch chip 2.

[0061] The equality of the first length and the second length can be either completely equal or approximately equal. Approximately equal means that the transmission time and attenuation of the first clock signal along the first length path and the transmission time and attenuation of the second clock signal along the second length path are within the allowable error range for the intended use. For example, when using the display device, the user cannot clearly perceive a difference between the area driven by the first touch chip 1 and the area driven by the second touch chip 2.

[0062] The clock generator can be a crystal oscillator, which includes active and passive crystal oscillators. Taking an active crystal oscillator as an example, the time it takes for an active crystal oscillator to start oscillating after power-on and reach full oscillation (i.e., the amplitude of the sine or square wave signal output by the crystal oscillator reaches a stable value) is called the start-up time. Because active crystal oscillators generally have a high quality factor, their start-up time is often relatively long. For example, the average start-up time of a conventional active crystal oscillator is 10ms. Assuming a 10% difference in start-up time between different active crystal oscillators, the difference in start-up time between different active crystal oscillators may exceed 1ms. A difference in start-up time exceeding 1ms may cause signal synchronization and data sampling / reception abnormalities in the initial state between the first touch chip 1 and the second touch chip 2.

[0063] Therefore, as Figure 9 and Figure 10 As shown, the first touch chip 1 and the second touch chip 2 can be electrically connected to achieve a handshake between them. The first touch chip 1 and the second touch chip 2 achieve synchronization through this handshake.

[0064] In order to achieve synchronization between the first touch chip 1 and the second touch chip 2, when the first touch chip 1 receives the first clock signal, it sends a first clock synchronization confirmation signal to the second touch chip 2, and when the second touch chip 2 receives the second clock signal, it sends a second clock synchronization confirmation signal to the first touch chip 1.

[0065] For example, when the first touch chip 1 receives the first clock signal from the first clock generator 5, the first touch chip 1 continuously sends a first clock synchronization confirmation signal to the second touch chip 2 to confirm whether the second touch chip 2 has received the second clock signal sent by the second clock generator 6; when the second touch chip 2 has received the second clock signal, the second touch chip 2 sends a second clock synchronization confirmation signal to the first touch chip 1. After the first touch chip 1 receives the second clock synchronization confirmation signal, the first touch chip 1 and the second touch chip 2 begin to perform coding and sampling based on the clock signal.

[0066] Thus, the maximum difference in sampling time slots caused by the clock signals received by the first touch chip 1 and the second touch chip 2 is one clock cycle. Taking a 64MHz active crystal oscillator as an example, one clock cycle = 1 / 64MHz = 15ns, and the difference in time slots at the ns level has little impact on the sampling of the touch chips.

[0067] The first touch chip 1 and the second touch chip 2 can be connected and send signals through general purpose input / output pins (GPIO pins).

[0068] It is understood that the first touch chip 1 and the second touch chip 2 can also achieve consistency of their reference clocks through other handshaking methods, which will not be elaborated upon in this application. Furthermore, when the clock generator is a passive crystal oscillator, the first touch chip 1 and the second touch chip 2 can also achieve consistency of their reference clocks through handshaking.

[0069] In addition, such as Figure 9 and Figure 10 As shown, the first touch chip 1 and the second touch chip 2 may also include a Serial Peripheral Interface (SPI) signal and a reset signal (RST). The communication signals (SPI & I2C, interrupt INT, reset RST, report enable Report_EN) of the first touch chip 1 and the second touch chip 2 are connected to the host. The display synchronization signals HSYNC & VSYNC provided by T-con4 are connected to the first touch chip 1 or the second touch chip 2.

[0070] The first touch chip 1 and the second touch chip 2 can be connected and transmit signals through a flexible ribbon cable or coaxial cable.

[0071] When the first clock generator 5 and the second clock generator 6 are active crystal oscillators, they require input control signals. To ensure that the delay and attenuation of the control signals sent to the first clock generator 5 and the second clock generator 6 are basically the same, and that the amplitude and phase are basically the same, so that the start-up time of the first clock generator 5 and the second clock generator 6 are the same, the load capacitance and impedance of the trace path for the control signal to be transmitted to the first clock generator 5 are approximately the same as those of the trace path for the control signal to be transmitted to the second clock generator 6.

[0072] The display module may include a display driver board 20 and a touch driver board 40. The display device also includes a motherboard electrically connected to the display driver board 20 and the touch driver board 40 via a flexible circuit. A first touch chip 1 and a first clock generator 5 are disposed on the display driver board 20, and a second touch chip 2 and a second clock generator 6 are disposed on the touch driver board 40. The motherboard and the display driver board 20 form a first circuit that sends an oscillation signal to the first clock generator 5, and the motherboard and the touch driver board 40 form a second circuit that sends an oscillation signal to the second clock generator 6. The first circuit and the second circuit have the same load capacitance and impedance.

[0073] For example, the motherboard includes a first motherboard 50 and a second motherboard 60, which are electrically connected via a flexible circuit. The control signal is Vin_OSC, transmitted from the first motherboard 50 to the first clock generator 5 and the second clock generator 6. Specifically, the control signal is transmitted sequentially through the first motherboard 50, the flexible circuit, and the touch driver board 40 to the second clock generator 6; and the control signal is transmitted sequentially through the first motherboard 50, the flexible circuit, the second motherboard 60, the flexible circuit, and the display driver board 20 to the first clock generator 5.

[0074] Of course, this application does not limit where the control signal is transmitted from. It can also be transmitted from the display driver board 20, the touch driver board 40, the second main board 60, etc. The main point is to make the load capacitance and impedance of the control signal to the first clock generator 5 and the second clock generator 6 approximately the same.

[0075] In practical applications, the load capacitance and impedance of the control signal transmission path can be determined through circuit simulation, and the load capacitance and impedance can be adjusted.

[0076] Active crystal oscillators contain an internal oscillation circuit and require an external appropriate voltage excitation to automatically start oscillating and output a reference clock signal. Passive crystal oscillators do not have an internal oscillation circuit and require the touch chip's internal oscillation circuit to start oscillating before outputting the reference clock signal to the touch chip.

[0077] Therefore, as Figure 7As shown, when the first clock generator 5 and the second clock generator 6 are passive crystal oscillators, the first touch chip 1 sends an oscillation start signal to the first clock generator 5, causing the first clock generator 5 to start oscillating and then send a first clock signal to the first touch chip 1. Similarly, the second touch chip 2 sends an oscillation start signal to the second clock generator 6, causing the second clock generator 6 to start oscillating and then send a first clock signal to the second touch chip 2.

[0078] The above description only uses the example of the first clock generator 5 and the second clock generator 6 being both active crystal oscillators or both passive crystal oscillators. Those skilled in the art will understand that the first clock generator 5 can also be an active crystal oscillator and the second clock generator 6 can be a passive crystal oscillator; or the first clock generator 5 can be a passive crystal oscillator and the second clock generator 6 can be an active crystal oscillator.

[0079] In addition, when the display device is equipped with an active stylus, the improved consistency of the reference clock between the first touch chip 1 and the second touch chip 2 can prevent signal synchronization and data sampling / reception abnormalities between the active stylus and the first touch chip 1 and the second touch chip 2.

[0080] In some embodiments, the touch layer includes a first touch layer that receives touch signals from a first area and a second touch layer that receives touch signals from a second area. The first touch layer and the second touch layer are disconnected. The first touch chip 1 is electrically connected to the first touch layer, and the second touch chip 2 is electrically connected to the second touch layer.

[0081] In the embodiments of this application, such as Figure 8 As shown, to further reduce the touch Cp Loading and RC Loading of the display panel 10, the touch electrode channel can be designed to be disconnected, divided into two independent touch half-screen areas, with the touch electrodes in each touch half-screen area routed in a 2T1R manner. For example, the display panel 10 is a foldable display panel 10, and the touch electrode channel can be designed to be disconnected along the folding line of the display panel 10.

[0082] Each touch chip can drive and control a half-screen area. For example, the first touch chip 1 drives and controls the lower half of the graphic display panel 10, and the second touch chip 2 drives and controls the upper half of the graphic display panel 10. The first touch chip 1 and the second touch chip 2 drive and collect touch data for their respective half-screen areas. The first touch chip 1 can transmit the half-screen touch data to the second touch chip 2 through a pass-through interface. The MCU inside the second touch chip 2 processes the full-screen touch data and calculates the reported coordinates, and then uploads it to the host device.

[0083] Alternatively, each touch chip can independently drive and control a touch half-screen area. The first touch chip 1 and the second touch chip 2 respectively collect touch data of their respective touch half-screen areas and upload them to the host device (Host) independently through a serial interface. The host device (Host) processes the full-screen touch data and calculates the reported coordinates.

[0084] To reduce the display RC Loading of the display panel 10, multiple ELVSS and ELVDD traces on the upper side of the panel are connected to the ELVSS and ELVDD traces on the display driver board 20 on the lower side of the panel, which can improve the uniformity of the display color brightness of the display panel 10.

[0085] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display module, characterized by The display module comprises a display panel, a first touch chip, a second touch chip, a first clock generator and a second clock generator. The display panel comprises a display substrate and a touch layer stacked on the display substrate. The first touch chip and the second touch chip are electrically connected with the touch layer and used for driving the touch layer. The first clock generator is electrically connected with the first touch chip and used for sending a first clock signal to the first touch chip. The second clock generator is electrically connected with the second touch chip and used for sending a second clock signal to the second touch chip. The first touch chip and the first clock generator are connected at a first side of the display panel, the second touch chip and the second clock generator are connected at a second side of the display panel, and the first side and the second side are opposite. The display module further comprises a display driving board connected at the first side and a touch driving board connected at the second side, the first touch chip and the first clock generator are arranged on the display driving board, and the second touch chip and the second clock generator are arranged on the touch driving board.

2. The display module of claim 1, wherein, The length of the wire between the first touch chip and the first clock generator is a first length, and the length of the wire between the second touch chip and the second clock generator is a second length, and the first length is equal to the second length.

3. The display module of claim 1, wherein The first touch chip and the second touch chip are electrically connected to realize handshake of the first touch chip and the second touch chip.

4. The display module of claim 3, wherein When the first touch chip receives the first clock signal, the first touch chip sends a first clock synchronization confirmation signal to the second touch chip, and when the second touch chip receives the second clock signal, the second touch chip sends a second clock synchronization confirmation signal to the first touch chip.

5. The display module of any of claims 1-4, wherein, The first clock generator and / or the second clock generator is an active crystal oscillator; or, the first clock generator and / or the second clock generator is a passive crystal oscillator.

6. The display module of any of claims 1-4, wherein, The touch layer comprises a first touch layer receiving a first area touch signal and a second touch layer receiving a second area touch signal, the first touch layer and the second touch layer are arranged separately, the first touch chip is electrically connected with the first touch layer, and the second touch chip is electrically connected with the second touch layer.

7. A display device, characterized by comprising: The display module comprises the display module according to any one of claims 1-6.

8. The display device according to claim 7, wherein The display module comprises a display driving board and a touch driving board, and the display device further comprises a main board electrically connected with the display driving board and the touch driving board; The first touch chip and the first clock generator are arranged on the display driving board, and the second touch chip and the second clock generator are arranged on the touch driving board; The first clock generator and the second clock generator are active crystal oscillators; the main board and the display driving board form a first circuit for sending a start signal to the first clock generator; the main board and the touch driving board form a second circuit for sending a start signal to the second clock generator; The load capacitance and impedance of the first circuit and the second circuit are the same.

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