Ultra-thin patch type LED display module and display screen

Abstract

The utility model discloses a kind of ultra-thin patch type LED display module and display screen, including circuit board, light guide film, light barrier layer, diaphragm and LED light source, LED light source is provided on circuit board, light guide film is set on the upper surface of circuit board, light barrier layer is set on the outer periphery of light guide film, diaphragm is set on the upper surface of light barrier layer.Circuit board is hard board, or the circuit board is flexible circuit board.Light guide film is used to replace existing light guide plate, the thickness of light guide film is as low as 0.1~0.5mm, directly pasted on the surface of circuit board, light guide film, light and thin, resistant to bending, resistant to high temperature, size can be cut at will when using, convenient to use.Based on using light guide film, flexible circuit board is used, the further reduction of display module thickness is realized, and flexible combination and connection of entire display module are realized, whole can be directly bonded with panel assembly, complex fixed frame and rigid fixing mode are saved, convenient to use, more complex use scene is suitable, display screen is thinner and can have camber.

Description

Technical Field

[0001] This utility model belongs to the field of display screen technology, specifically relating to an ultra-thin surface-mount LED display module. Background Technology

[0002] LED displays are active, controllable electroluminescent devices that use LED light sources as the basic light-emitting element. Through the system's control and processing unit, they can display information such as text, graphics, and images. LED displays adopt low-voltage scanning drive and have advantages such as low power consumption, low cost, high brightness, wide viewing angle, long viewing distance, waterproof, and a variety of specifications, which can meet the needs of various application scenarios.

[0003] Current mainstream LED displays mainly consist of circuit boards, light guide plates, light sources, light-blocking components, films, and panel assemblies. The conductive layer for receiving touch control signals is either located on the circuit board or composited within the film. However, placing the conductive layer within the film is costly. To further reduce costs, the conductive layer can be placed on the upper surface of the circuit board. When a finger touches the screen, the signal travels through the panel, film, and light guide plate before reaching the conductive layer on the circuit board. The shorter the distance between the touch point and the conductive layer, the more sensitive the signal. Existing panel assemblies, with their transparent window (1-2mm), film (approximately 0.1mm), and light guide plate (1-2mm), have an overall touch distance exceeding 2mm. To further enhance signal sensitivity, the overall thickness of the display panel should be minimized.

[0004] Existing circuit boards and light guide plates are made of rigid materials, such as PMMA (acrylic) and PC (polycarbonate), which are rigid and cannot be bent, limiting many application scenarios that require bending; and their thickness is between 0.5 and 3 mm, which reduces signal sensitivity. Utility Model Content

[0005] The technical problem solved by this utility model is to provide an ultra-thin display module that uses a light guide film to achieve light guidance, an ultra-thin flexible display module that uses a light guide film and a flexible circuit board, and a display panel that uses the above two display modules.

[0006] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] An ultra-thin surface-mount LED display module includes a circuit board, a light guide film, a light blocking layer, a film, and an LED light source. The LED light source is disposed on the circuit board, the light guide film is disposed on the upper surface of the circuit board, the light blocking layer is disposed on the outer periphery of the light guide film, and the film is disposed on the upper surface of the light blocking layer.

[0008] Furthermore, the thickness of the light guide film is 0.1 to 0.5 mm.

[0009] Furthermore, the circuit board is a rigid board, or the circuit board is a flexible circuit board.

[0010] Furthermore, it also includes a first adhesive layer and a second adhesive layer. The light guide film is disposed on the upper surface of the circuit board through the first adhesive layer, and the film is disposed on the upper surface of the light blocking layer through the second adhesive layer.

[0011] Furthermore, a reflective film is also provided between the light guide film and the circuit board.

[0012] Furthermore, the LED light source is either Mini LED or Micro LED.

[0013] Furthermore, the first adhesive layer and the second adhesive layer are made of optically transparent adhesive.

[0014] Furthermore, if the circuit board is a rigid board, the light-blocking layer is a soft light-blocking layer made of foam or a rigid light-blocking layer made of plastic; or if the circuit board is a flexible circuit board, the light-blocking layer is a soft light-blocking layer made of foam.

[0015] Furthermore, when the display module integrates a digital tube, the digital tube adopts a retractable design.

[0016] A display screen employing the aforementioned ultra-thin surface-mount LED display module.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0018] (1) The ultra-thin patch LED display module of this utility model uses a light guide film to replace the existing light guide plate. The thickness of the light guide film is as low as 0.1-0.5mm. It is directly pasted on the surface of the circuit board. The light guide film is thin, flexible, and heat-resistant, making it suitable for use with heat-generating light sources such as LEDs. Compared with the traditional light guide plate, the thickness is greatly reduced. It can be rolled up for storage and can be cut to any size when used. Unlike the light guide plate, it does not require customized size and shape, making it convenient to use.

[0019] (2) The ultra-thin patch LED display module of this utility model adopts a flexible circuit board on the basis of using a light guide film. The thickness of the flexible circuit board is as low as 0.1-0.3mm, which further reduces the thickness of the display module and realizes the flexible combination and connection of the entire display module. It can be directly bonded to the panel assembly, eliminating the need for a complex fixing frame and rigid fixing method. It is convenient to use and suitable for more complex usage scenarios. It is also suitable for various irregular parts, irregular panels and other home appliances. The display screen is thinner and can be curved.

[0020] (3) The ultra-thin patch LED display module of this utility model adopts Mini LED or Micro LED with thinner thickness and smaller size. Through reasonable arrangement and density design, it is more suitable for use with flexible circuit boards and light guide films.

[0021] (4) In the ultra-thin patch LED display module of this utility model, the light guide film and the circuit board, the light blocking layer and the film, or the reflective layer and the circuit board and the light guide film are bonded with liquid optical transparent adhesive. It can be cured quickly by UV curing, which can improve production efficiency and ensure light transmittance. Attached Figure Description

[0022] Figure 1 This is an exploded view of Example 1;

[0023] Figure 2 This is a side sectional view of Example 1;

[0024] Figure 3 This is a schematic diagram of the reflective film provided in Example 1;

[0025] Figure 4 This is a side sectional view of the digital tube in Example 2 (retracted).

[0026] Figure 5 This is an exploded view of Example 3;

[0027] Figure 6 This is a side cross-sectional view of Example 3. Detailed Implementation

[0028] The present invention will be further illustrated below with reference to specific embodiments. The embodiments are implemented based on the technical solution of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0029] Example 1

[0030] like Figure 1 and 2 As shown, the ultra-thin patch LED display module of this embodiment includes a circuit board 1, a first adhesive layer 2, a light guide film 3, a light blocking layer 4, a second adhesive layer 5, a film 6, and an LED light source 7. An LED light source 7 is disposed on the circuit board 1. The light guide film 3 is attached to the upper surface of the circuit board 1 through the first adhesive layer 2. The light blocking layer 4 is disposed on the outer periphery of the light guide film 4. The film 6 is attached to the upper surface of the light blocking layer 4 through the second adhesive layer 5.

[0031] like Figure 3As shown, a reflective film 8 (optional configuration) can also be provided between the circuit board 1 and the light guide film 3 to reflect light in the direction of the film 6, thereby improving backlight efficiency and enhancing display brightness. The reflective film can be made of materials such as polyethylene terephthalate (PET) or modified polyethylene terephthalate.

[0032] In this embodiment, circuit board 1 is a rigid board (PCB), such as a PCB with FR4 substrate, or a PCB with aluminum, ceramic, etc. substrate. Conventional household appliances can use FR4 PCB, while household appliances or components with high heat dissipation requirements can use aluminum substrate PCB with better heat dissipation performance.

[0033] This embodiment does not use a traditional light guide plate (LGP), but instead uses a thinner light guide film (LGF), such as a light guide film made of polycarbonate (PC) material. This light guide film is lightweight, thin, bend-resistant, and heat-resistant, making it suitable for use with heat-generating light sources such as LEDs. The light guide film achieves uniform light diffusion through precision coating or hot-pressing processes, avoiding light spots or uneven brightness, and improving visual comfort.

[0034] The thickness of the light guide film 4 can be as low as 0.1-0.5 mm, which is significantly reduced compared to traditional light guide plates. In this embodiment, the thickness of the light guide film can be 0.1 mm. The light guide film 4 is thin, can be rolled up for storage, and can be cut to any size when needed, unlike light guide plates which require customized dimensions and shapes, making it convenient to use.

[0035] The light guide film 4 is directly bonded to the upper surface of the circuit board 1 via the first adhesive layer 2. The first adhesive layer 2 uses a liquid optical clear adhesive (LOCA), which is UV cured to achieve rapid curing of the light guide film 4 to the upper surface of the circuit board 1, improving production efficiency. The first adhesive layer can be made of acrylic resin-based LOCA, silicone-based LOCA, or photosensitive resin, etc., selected according to requirements while taking into account factors such as light transmittance, temperature resistance, and curing time.

[0036] The thickness of the light guide film 4 is reduced. To improve light utilization, in this embodiment, the LED light source uses a thinner and smaller Mini LED or Micro LED. The Mini LED uses a surface-mount LED (SMD LED). The package sizes of conventional monochrome SMD LEDs are 1206 (3215), 1004 (2510), 0805 (2012), and 0603 (1608). For example, an SMD LED with a size of 0603 has a thickness of only 0.3 mm. Since this embodiment uses a thinner light guide film (0.1 mm-0.5 mm) instead of the existing light guide plate with a thickness of more than 1 mm, considering the overall cost, this embodiment preferably uses Mini LED.

[0037] In this embodiment, the LED light source is a side-mounted, side-emitting type, such as... Figure 2 and Figure 3 As shown, LED light is projected towards the light guide film, and after the combined effect of total internal reflection and scattering by the light guide film, uniform light distribution is achieved. Considering the thinness of the light guide film, in order to compensate for the loss of light coupling efficiency, the number of LEDs can be increased or high-brightness chips can be selected, or the LED light source can be arranged on both sides or around the perimeter to avoid insufficient brightness at the far end caused by light entering from one side.

[0038] Example 2

[0039] The technical problem addressed in this embodiment is how to balance the overall ultra-thin design with the increased thickness caused by the light travel required for bottom-emitting LEDs when integrating a digital tube on a circuit board. The digital tube can be composed of multiple bottom-emitting LEDs arranged in a figure-eight shape, with each LED individually controlled to display the desired numerical pattern. The bottom-emitting LEDs are point light sources; the light travels a certain distance to form a surface light source.

[0040] like Figure 4 As shown, to solve the above problems, in this embodiment, if a digital tube is to be installed, the digital tube can be made into a separate small second circuit board 9. An "8"-shaped LED is soldered onto the second circuit board 9. The second circuit board 9 is soldered to the back of the original circuit board 1, with its front facing the same direction as the front of the circuit board 1. Through holes are opened in the original circuit board 1 to accommodate the LEDs on the second circuit board 9. For a detailed description of the specific setup, please refer to the applicant's earlier Chinese utility model patent application number 2023214228836: A Thin Display Module with a Split-Type Retractable Digital Tube, which will not be repeated here.

[0041] Example 3

[0042] like Figure 5 and 6As shown, this embodiment further reduces the thickness of the entire display screen based on embodiment 1, and can achieve flexibility and bendability of the entire display screen. The ultra-thin patch flexible LED display module of this embodiment includes a circuit board 1, a first adhesive layer 2, a light guide film 3, a light blocking layer 4, a second adhesive layer 5, a film 6, and an LED light source 7, etc. An LED light source 7 is provided on the circuit board 1, the light guide film 3 is attached to the upper surface of the circuit board 1 through the first adhesive layer 2, and the light blocking layer 4 is disposed on the outer periphery of the light guide film 4.

[0043] Unlike Embodiment 1, the circuit board 1 in this application uses a flexible printed circuit (FPC), which further reduces the thickness of the display module and enables flexible assembly and connection of the entire display module. In this embodiment, the main materials such as the circuit board 1, light guide film 3, light blocking layer 4, and film 6 are all flexible and bendable materials, and their thickness is further reduced.

[0044] Flexible circuit boards are flexible printed circuit boards made of polyimide or polyester film as the substrate. In order to meet the requirements of attaching reflective film 8, light guide film 3 and setting touch control layer on the upper surface of the circuit board, flexible circuit boards can be double-sided, and other circuits are set on the back of the flexible circuit board.

[0045] To meet the design requirements of the flexible circuit board, the LED light source 7 in this embodiment can be a Mini LED. However, to further improve the performance and reduce the thickness, a Micro LED is preferred in this embodiment. When used with the flexible circuit board, a thin-film encapsulation method can be employed, integrating the Micro LED and driving circuitry onto a flexible film, with a protective layer covering the surface. Micro LEDs can achieve ultra-high density integration and can even be used in ultra-thin, flexible devices less than 0.1 mm thick.

[0046] Example 4

[0047] This embodiment, as an application scenario of Embodiments 1-3, shows an ultra-thin surface-mount LED display module mounted on a panel assembly. The panel assembly generally includes a panel support and a transparent window embedded in the upper surface of the panel support. The transparent window is generally made of acrylic or glass. The transparent window can also be integrally formed with the panel support, depending on the application scenario and requirements.

[0048] Since the display module of this application can be made thinner, the display modules of embodiments 1-2 can be connected by conventional fixing methods, such as snap-fit ​​connection, screw fixing, etc., and then glue is poured on the back for waterproofing.

[0049] The flexible display module of Example 3 is made of flexible material, which can be bent at will and is thinner. Therefore, it can be directly pasted onto the transparent window of the panel assembly. After the ultra-thin patch flexible LED display module is assembled and tested, it can be directly pasted onto the back of the transparent window using optical transparent adhesive.

[0050] Example 5

[0051] The display module and display panel of this utility model are applicable to, but are not limited to, washing machines, refrigerators, dishwashers, water purifiers (pipeline machines, tea bar machines), range hoods, water heaters, ovens, robot vacuums, air conditioners, or other home appliances.

[0052] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An ultra-thin surface-mount LED display module, characterized in that: The device includes a circuit board (1), a light guide film (3), a light blocking layer (4), a film (6), and an LED light source (7). The LED light source (7) is provided on the circuit board (1), the light guide film (3) is provided on the upper surface of the circuit board (1), the light blocking layer (4) is provided on the outer periphery of the light guide film (3), and the film (6) is provided on the upper surface of the light blocking layer (4).

2. The ultra-thin surface-mount LED display module according to claim 1, characterized in that: The thickness of the light guide film (3) is 0.1 to 0.5 mm.

3. The ultra-thin surface-mount LED display module according to claim 1, characterized in that: The circuit board (1) is a rigid board or a flexible circuit board.

4. The ultra-thin surface-mount LED display module according to claim 1 or 2, characterized in that: It also includes a first adhesive layer (2) and a second adhesive layer (5). The light guide film (3) is bonded to the upper surface of the circuit board (1) through the first adhesive layer (2), and the film (6) is bonded to the upper surface of the light blocking layer (4) through the second adhesive layer (5).

5. The ultra-thin surface-mount LED display module according to claim 1, characterized in that: A reflective film (8) is also provided between the light guide film (3) and the circuit board (1).

6. The ultra-thin surface-mount LED display module according to claim 1, 2, or 3, characterized in that: The LED light source (7) is either Mini LED or Micro LED.

7. The ultra-thin surface-mount LED display module according to claim 4, characterized in that: The first adhesive layer (2) and the second adhesive layer (5) are made of optically transparent adhesive.

8. The ultra-thin surface-mount LED display module according to claim 3, characterized in that: If the circuit board (1) is a rigid board, then the light blocking layer (4) is a soft light blocking layer (4) made of foam or a rigid light blocking layer (4) made of plastic; or if the circuit board (1) is a flexible circuit board (1), then the light blocking layer (4) is a soft light blocking layer (4) made of foam.

9. The ultra-thin surface-mount LED display module according to claim 1, characterized in that: When the display module integrates a digital tube, the digital tube adopts a retractable design.

10. A display screen employing the ultra-thin surface-mount LED display module as described in any one of claims 1-9.

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