Display module and display device

Abstract

The present application provides a display module and a display device, wherein the display module comprises: a backlight module, comprising a backplane frame and an optical component located on the backplane frame; a display panel located on the light-emitting side of the backlight module; and a conductive layer located on a side of the backplane frame away from the optical component; wherein the backplane frame is electrically connected to the display panel, and the conductive layer is grounded. The display module provided by the present application can effectively prevent howling.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular, to a display module and a display device. Background Art

[0002] The problem of mobile phone howling has become a major problem that plagues the display screen industry in recent years. The so-called howling refers to the continuous sound similar to the sound of electric current when the ear is close to the mobile phone screen. The sound volume varies with different people's sensitivity to low-frequency / high-frequency sounds. One of the reasons for the howling is as follows: the mobile phone screen is divided into four parts: display panel, backlight module, driver chip (IC), and flexible circuit board (FPC). The driver chip is crimped on the display panel, and the flexible circuit board connects the display panel and the backlight module to form a loop. When the TDDI (Touch and Display Driver Integration) product is in touch operation, the driver chip sends a pulse signal, forming a howling source. The alternating scanning voltage in the loop causes the backlight module and the display panel to form a capacitor. The iron frame of the backlight module and the touch layer of the display panel are the two poles of the capacitor. Due to the continuous change of the pressure difference in the capacitor, the optical diaphragm inside the backlight module is constantly vibrated mechanically by the reverse piezoelectric effect, amplifying the howling source and forming howling. Summary of the invention

[0003] In view of this, the present application provides a display module and a display device, which prevent howling by blocking the amplification path of the howling source according to the howling generation principle.

[0004] The present application provides a display module, comprising:

[0005] A backlight module, comprising a back panel frame and an optical component located on the back panel frame;

[0006] A display panel is located on the light-emitting side of the backlight module; and

[0007] A conductive layer, located on a side of the backplane frame facing away from the optical component;

[0008] Wherein, the back panel frame is electrically connected to the display panel, and the conductive layer is grounded.

[0009] In an optional embodiment of the present application, the display module also includes a flexible circuit board, one end of which is electrically connected to the display panel, and the other end of the flexible circuit board is bent to a side of the conductive layer away from the back panel frame and electrically connected to the conductive layer.

[0010] In an optional embodiment of the present application, an end portion of the other end of the flexible circuit board extends out of an edge of the conductive layer and is electrically connected to the backplane frame.

[0011] In an optional embodiment of the present application, the display panel further includes a touch electrode layer, and in the touch stage, the voltage difference between the touch electrode layer and the back panel frame is 0.

[0012] In an optional embodiment of the present application, an insulating layer is provided between the conductive layer and the backplane frame.

[0013] In an optional embodiment of the present application, the back panel frame includes a bottom plate and a side wall located at the edge of the bottom plate and perpendicular to the bottom plate, the bottom plate and the side wall form a accommodating cavity, the optical component is located in the accommodating cavity, the display panel is supported by the side wall above the optical component and is arranged opposite to the optical component, and the conductive layer is located on the side of the bottom plate away from the optical component.

[0014] In an optional embodiment of the present application, the optical component includes a light guide plate, a light source, and an optical film. The light guide plate is located on the base plate, the light source is located on the base plate and is arranged toward the light guide plate, and the optical film is located on the side of the light guide plate, including a first optical film located on a side of the light guide plate close to the base plate and a second optical film located on a side of the light guide plate away from the base plate.

[0015] In an optional embodiment of the present application, the conductive layer is selected from any one of metal, a film containing conductive particles, and a conductive glue.

[0016] In an optional embodiment of the present application, the conductive layer is copper foil.

[0017] The present application provides a display device, comprising the display module as described in any of the above embodiments.

[0018] The beneficial effects of the present application are as follows: the display module provided by the present application adds a conductive layer on the side of the back panel frame away from the optical component, and uses the conductive layer as a ground layer. The back panel frame serves as a component, and during touch operation, synchronously outputs a consistent pulse signal to the back panel frame and the display panel. Even if the voltage of the back panel frame and the display panel remains consistent, there is no pressure difference between the back panel frame and the display panel, thereby avoiding the formation of capacitance between the back panel frame and the display panel, so that the internal film material of the backlight module will not undergo mechanical vibration due to the voltage change between the back panel frame and the display panel, thereby blocking the howling source. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a display module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0022] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0023] The present application may repeat reference numerals and / or reference letters in different implementations. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various implementations and / or settings discussed.

[0024] The display module provided in the present application will be described in detail below in conjunction with specific embodiments and drawings.

[0025] In order to improve the reliability of the display device in the prior art, an iron frame is usually used as the supporting structure of the backlight module. However, when the display device is working, the iron frame may generate static electricity. The static electricity generated by the iron frame may cause damage to the devices in the backlight module, and even damage the devices in other structures of the display device. Therefore, the iron frame is usually grounded to release static electricity. The voltage of the iron frame is the ground potential, and the voltage is regarded as 0. When the display device is working, the common electrode layer in the display panel and the iron frame constitute an equivalent capacitor. When the display panel is in the display stage, the voltage on the common electrode layer is constant and is not much different from the ground potential, which will not cause mechanical vibration of the optical film between the display panel and the iron frame, and there will be no howling problem. For TDDI products, the common electrode is reused as a touch electrode, and the touch electrode usually inputs a pulse modulation signal as a touch scanning signal. When the display panel is in the touch stage, due to the large frequency of the pulse modulation signal, and the peak or trough is greatly different from the ground potential, there is a changing potential difference between the touch electrode and the iron frame, which causes the optical film between the display panel and the iron frame to continuously vibrate mechanically, amplifying the howling source and forming howling.

[0026] In order to solve the above problems, the present application provides a display module and a display device, which prevent howling by blocking the amplification path of the howling source according to the principle of howling generation.

[0027] The following will be combined Figure 1 The structure of the display module of the present application is specifically described.

[0028] The present application provides a display module 10, including a backlight module 100, a display panel 200, and a conductive layer 300. The backlight module 100 includes a backplane frame 110 and an optical component 120 located on the backplane frame 110. The backplane frame 110 is used to fix and support the optical component 120, and the optical component 120 is used to provide a light source for the display panel 200. The display panel 200 is located on the light-emitting side of the backlight module 100 and is used to display images. The conductive layer 300 is located on the side of the backplane frame 110 away from the optical component 120. The backplane frame 110 is electrically connected to the display panel 200 so that the backplane frame 110 receives the signal transmitted by the display panel 200 when the display module is working, and the conductive layer 300 is grounded to release static electricity.

[0029] In the display module structure of the present application, the conductive layer replaces the backplane frame as the grounding layer. At this time, the backplane frame is only used as a component for connecting the circuit. By outputting a consistent pulse signal to the backplane frame and the display panel, the voltage of the backplane frame and the display panel is kept consistent, that is, there is no pressure difference between the backplane frame and the display panel, so that the film material of the optical component located between the backplane frame and the display panel will not vibrate mechanically due to the continuous change of voltage, so as to block the howling source and avoid the howling problem.

[0030] In an optional embodiment of the present application, the display module 10 also includes a flexible circuit board 500, one end of the flexible circuit board 500 is electrically connected to the display panel 200, and the other end of the flexible circuit board 500 is bent to a side of the conductive layer 300 away from the back panel frame 110 and electrically connected to the conductive layer 300.

[0031] It can be understood that the display panel 200 is electrically connected to the backlight module 100 through the flexible circuit board 500, and the flexible circuit board 500 transmits signals between the display panel 200 and the backlight module 100 to realize the display function of the display panel 200. Since the flexible circuit board 500 is easily affected by static electricity, the flexible circuit board 500 is connected to the conductive layer 300, and the conductive layer 300 is grounded, so that the flexible circuit board 500 is grounded through the conductive layer 300 to release static electricity, avoid static electricity from damaging the flexible circuit board 500, and avoid problems in the electrical test of the flexible circuit board 500.

[0032] In some embodiments, the display panel 200 includes a display area and a non-display area, the display area is arranged opposite to the backlight module 100, the non-display area is connected to the flexible circuit board 500, and a driver chip (not shown in the figure) is also bound to the non-display area, the flexible circuit board 500 is electrically connected to the driver chip, and the driver chip is used to emit a pulse signal.

[0033] In an optional embodiment of the present application, an end portion of the other end of the flexible circuit board 500 extends out of the edge of the conductive layer 300 and is electrically connected to the backplane frame 110 .

[0034] Specifically, the flexible circuit board 500 bent to the side of the conductive layer 300 away from the backplane frame 110 completely covers the conductive layer 300 and extends out of the edge of the conductive layer 300. The extended part of the flexible circuit board 500 is connected to the backplane frame 110 by conductive tape or welding, so that the flexible circuit board 500 is electrically connected to the backplane frame 110, and the flexible circuit board 500 is electrically connected to the display panel 200. Therefore, when the driving chip sends a pulse signal, it can synchronously output a pulse signal consistent with the display panel 200 to the backplane frame 110 through the flexible circuit board 500. In this process, the backplane frame 110 is used as a component to connect the circuit and receive the pulse signal output by the flexible circuit board 500 to maintain the same voltage as the display panel 200, so that there is no pressure difference between the backplane frame 110 and the display panel 200, and mechanical vibration of the film material of the optical component 120 between the backplane frame 110 and the display panel 200 is avoided.

[0035] In some embodiments, the display panel 200 may be but is not limited to a liquid crystal display panel, and the display panel 200 includes an upper polarizer, a color film substrate, a liquid crystal layer, an array substrate, and a lower polarizer (not shown) stacked in sequence from top to bottom.

[0036] In some embodiments, the display panel 200 can be a liquid crystal display panel with touch sensing function, including a vector pressure sensing technology touch panel, a resistive technology touch panel, a capacitive technology touch panel, an infrared technology touch panel, and a surface acoustic wave technology touch panel. Currently, the capacitive technology touch panel is commonly used on the market. The capacitive touch panel works by utilizing the current induction of the human body, and has the advantages of fast speed, wear resistance, and long life.

[0037] In an optional embodiment of the present application, the display panel 200 further includes a touch electrode layer (not shown in the figure). In the touch stage, the voltage difference between the touch electrode layer and the back panel frame 110 is 0.

[0038] Specifically, when the display panel 200 is touched, the capacitance of the touch electrode layer of the display panel 200 changes, the driving chip connected to the display panel 200 sends a pulse signal, and the flexible circuit board 500 outputs a pulse signal consistent with the touch electrode layer to the back panel frame 110. Even if the voltage difference between the touch electrode layer and the back panel frame 110 is 0, the formation of capacitance between the back panel frame 110 and the touch electrode layer is avoided, so that the film material of the optical component 120 between the back panel frame 110 and the touch electrode layer will not undergo mechanical vibration due to voltage changes, thereby blocking the howling source.

[0039] In some embodiments, the touch electrode layer can be an in-cell structure (the touch electrode layer is embedded in the liquid crystal pixel) or an on-cell structure (the touch electrode layer is embedded between the color filter substrate and the upper polarizer), and the position of the touch electrode layer is not specifically limited here.

[0040] In an optional embodiment of the present application, an insulating layer 400 is provided between the conductive layer 300 and the backplane frame 110 .

[0041] Specifically, the insulating layer 400 may be but is not limited to a polyimide film (PI), and the insulating layer 400 is used to insulate the backplane frame 110 from the conductive layer 300 to prevent the backplane frame 110 from being electrically connected to the conductive layer 300 and causing the conductive layer 300 to fail due to electrostatic discharge (ESD).

[0042] In an optional embodiment of the present application, the back panel frame 110 includes a bottom plate 111 and a side wall 112 located at the edge of the bottom plate 111 and perpendicular to the bottom plate 111, the bottom plate 111 and the side wall 112 form a accommodating cavity, the optical component 120 is located in the accommodating cavity, the display panel 200 is supported by the side wall 112 on the optical component 120 and is arranged opposite to the optical component 120, and the conductive layer 300 is located on the side of the bottom plate 111 away from the optical component 120.

[0043] In some embodiments, the side wall 112 and the bottom plate 111 may be integrally formed to fix and support the optical component 120 .

[0044] In some embodiments, one end of the side wall 112 is perpendicular to the bottom plate 111 and fixedly connected to the bottom plate 111, and the other end portion of the side wall 112 is partially bent above the bottom plate 111 to form a bending portion 113, and the bending portion 113 is parallel to the bottom plate 111. The bending portion 113 is used to support the display panel 200 to protect the optical component 120 and avoid light leakage. The bending portion 113 and the display panel 200 are connected with tape 600.

[0045] In an optional embodiment of the present application, the optical component 120 includes a light guide plate 121, a light source, and an optical film. The light guide plate 121 is located on the base plate 111. The light source is located on the base plate 111 and is arranged toward the light guide plate 121. The optical film is located on the side of the light guide plate 121, including a first optical film 123 located on the side of the light guide plate 121 close to the base plate 111 and a second optical film 124 located on the side of the light guide plate 121 away from the base plate 111.

[0046] like Figure 1As shown, taking the edge-lit backlight structure as an example, the light source is located at the side of the light guide plate 121 and is arranged on the bottom plate 111, the first optical film 123 is arranged on the bottom plate 111 and is in the same layer as the light source, the light guide plate 121 is located on the side of the first optical film 123 away from the bottom plate 111, and the second optical film is located on the side of the light guide plate 121 away from the first optical film 123. After the light emitted by the light source enters the light guide plate 121 from the side, it is reflected multiple times in the light guide plate 121 and then transmitted out of the upper surface of the light guide plate 121. The light guide plate 121 can convert a point light source or a line light source into a surface light source required by the display panel.

[0047] Specifically, the light source may be an LED 122 , or a light bar 125 , or a combination of the LED 122 and the light bar 125 .

[0048] Specifically, the first optical film 123 may be a reflective film, and the second optical film 124 may be a stacked brightness enhancement film and a diffusion film.

[0049] The first optical film 123 and the second optical film 124 can be a single-layer structure or a stacked multi-layer structure, which is not specifically limited herein.

[0050] Since optical films are usually made of thermoplastic materials such as polyethylene terephthalate (PET) or polycarbonate (PC), the optical films made of the above materials are easily charged with static electricity in the electric field formed between the back panel frame and the display panel. When the electric field continues to change, the optical film will vibrate under the action of the electric field force, resulting in howling, which is the fundamental reason why the display module generates howling.

[0051] In an optional embodiment of the present application, the conductive layer 300 is selected from any one of metal, a film containing conductive particles, and a conductive glue, and no specific limitation is made here.

[0052] In an optional embodiment of the present application, the conductive layer 300 is copper foil. Copper is a metal material commonly used in display panel manufacturing, and copper has the characteristics of low resistance and reduced signal delay. Therefore, copper foil is preferably used as the conductive layer 300.

[0053] In an optional embodiment of the present application, the backplane frame 110 is an iron frame. Using a stainless steel iron frame as the backplane frame of the backlight module 100 can, on the one hand, improve the deformation resistance of the backplane frame 110 and improve the strength of the display module. On the other hand, the metal iron frame has conductive properties. In the structure of the display module, as a component, it can conduct the circuit and receive the pulse signal output by the flexible circuit board 500 to keep the voltage consistent with the display panel 200, so that there is no pressure difference between the backplane frame 110 and the display panel 200, and avoid mechanical vibration of the film material of the optical component 120 between the backplane frame 110 and the display panel 200.

[0054] The present application also provides a display device, which includes the display module 10 described in any of the above embodiments. The display device can be, but is not limited to, any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, etc.

[0055] In summary, the present application provides a display module and a display device. Without increasing the thickness of the display panel and the backlight module, a conductive layer is added to the side of the back panel frame of the backlight module away from the optical component, and the conductive layer is used as a ground layer. During touch operation, a consistent pulse signal is synchronously output to the back panel frame and the display panel. Even if the voltage of the back panel frame and the display panel is always kept consistent, there is no pressure difference between the back panel frame and the display panel, thereby avoiding the formation of capacitance between the back panel frame and the display panel, so that the internal film material of the backlight module will not undergo mechanical vibration due to the voltage change between the back panel frame and the display panel, thereby blocking the howling source.

[0056] In summary, although the present application has been disclosed as above with preferred embodiments, the above preferred embodiments are not intended to limit the present application. Ordinary technicians in this field can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of the present application shall be based on the scope defined in the claims.

Claims

1. A display module, characterized in that: include: A backlight module, comprising a back panel frame and an optical component located on the back panel frame; A display panel is located at the light-emitting side of the backlight module, and the back panel frame is electrically connected to the display panel; A conductive layer, located at a side of the backplane frame away from the optical component, the conductive layer being grounded; and A flexible circuit board, one end of which is electrically connected to the display panel, and the other end of which is bent to a side of the conductive layer away from the backplane frame and electrically connected to the conductive layer; Among them, the end of the other end of the flexible circuit board extends out of the edge of the conductive layer and is electrically connected to the back panel frame, and an insulating layer is provided between the conductive layer and the back panel frame; the display panel also includes a touch electrode layer, and in the touch stage, the flexible circuit board outputs a pulse signal consistent with the touch electrode layer to the back panel frame, so that the voltage difference between the touch electrode layer and the back panel frame is 0.

2. The display module according to claim 1, characterized in that: The back panel frame includes a bottom plate and side walls located at the edge of the bottom plate and perpendicular to the bottom plate, the bottom plate and the side walls form a accommodating cavity, the optical component is located in the accommodating cavity, the display panel is supported by the side walls on the optical component and is arranged opposite to the optical component, and the conductive layer is located on the side of the bottom plate away from the optical component.

3. The display module according to claim 2, characterized in that: The optical component includes a light guide plate, a light source, and an optical film. The light guide plate is located on the base plate. The light source is located on the base plate and is arranged toward the light guide plate. The optical film is located on the side of the light guide plate, including a first optical film located on the side of the light guide plate close to the base plate and a second optical film located on the side of the light guide plate away from the base plate.

4. The display module according to claim 1, characterized in that: The conductive layer is selected from any one of metal, a film containing conductive particles, and a conductive glue.

5. The display module according to claim 1, characterized in that: The conductive layer is copper foil.

6. A display device, characterized in that Comprising a display module as described in any one of claims 1-5.

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