Anti-shadow screw for DLED backlight module, backlight module and display device

Abstract

The utility model relates to a prevent shadow screw for DLED backlight module and backlight module and display equipment, including the screw cap (1) and the screw rod (2) of integrative forming with screw cap (1), its characterized in that, be equipped with white light reflection coating (11) on the screw cap (1) surface, be equipped with black coating (21) on the screw rod (2) surface, the reflectivity of white light reflection coating matches the reflectivity of the reflection sheet in the backlight module. The utility model has the advantages of eliminating the backlight shadow, improving the optical uniformity, the difference between the white coating of screw cap (reflectivity is greater than or equal to 80%) and the reflectivity of the reflection sheet is less than or equal to 15%, and the screw position is highly consistent with the light reflection ability of the reflection sheet.

Description

Technical Field

[0001] This utility model relates to an anti-shadow screw for a DLED backlight module, as well as a backlight module and a display device, belonging to the field of optics. Background Technology

[0002] Direct-lit backlight modules, as the mainstream light source solution for current LCD displays, typically consist of a metal backplate, LED strips (including lenses), reflectors, diffusers, and various optical films, arranged from bottom to top. To achieve a slim profile and structural reliability, key components such as LED strips, reflectors, and support columns are usually secured to the backplate with screws. In actual production, for the sake of a uniform appearance and exposed screw holes, industry practice dictates that the screws be coated with a black finish that perfectly matches the backplate. This process performs stably in medium to large-sized TVs or commercial displays with a large light mixing distance (OD > 20mm), ensuring assembly strength while avoiding visual abruptness caused by color differences. It has been widely adopted by major manufacturers and is considered a mature technology.

[0003] However, in recent years, with consumers' extreme pursuit of ultra-narrow bezels and ultra-thin bodies, the mixing distance of direct-lit backlight structures has been continuously compressed, and solutions with an OD of less than 20mm (such as OD15mm, OD12mm or even lower) have gradually become mainstream. Under extremely short mixing distance conditions, the light from the LED point light source reaches the reflector before it has fully diffused after passing through the lens, and the sensitivity of the intracavity light distribution to local reflectivity differences increases sharply. At this time, the nut area of ​​the traditional all-black screw has insufficient surface reflectivity (usually less than 10%), which contrasts sharply with the high reflectivity of the reflector (usually more than 90%), resulting in a visible circular shadow at the screw fixing point. This shadow not only destroys the backlight uniformity, which is particularly noticeable in dark scenes or pure color test signals, but is also further amplified by subsequent optical films, ultimately affecting the overall brightness uniformity, color consistency, and HDR display effect, becoming a technical bottleneck that is currently difficult to avoid in ultra-thin direct-lit backlight modules.

[0004] To overcome the above-mentioned defects, the industry has tried to compensate by increasing the haze of the diffuser plate, adding local dots, or attaching additional high-reflectivity sheets, but all of these methods have led to problems such as reduced light efficiency, increased costs, or increased assembly complexity, making it difficult to apply on a large scale. Utility Model Content

[0005] To overcome the shortcomings of existing technologies, this utility model provides an anti-shadow screw for DLED backlight modules, as well as a backlight module and a display device. The technical solution of this utility model is as follows: A shadow-proof screw for a DLED backlight module includes a nut (1) and a threaded rod (2) integrally formed with the nut (1), characterized in that a white reflective coating (11) is provided on the surface of the nut (1) and a black coating (21) is provided on the surface of the threaded rod (2); the reflectivity of the white reflective coating matches the reflectivity of the reflective sheet in the backlight module.

[0006] The black coating (21) is a black spray paint layer or a black anodized layer; the white reflective coating (11) is a spray paint layer or an electroplated layer with a reflectivity ≥80%.

[0007] The diameter of the nut (1) is larger than the diameter of the mounting hole of the reflector (3) of the backlight module.

[0008] A DLED backlight module includes a back plate, an LED light strip (6), a reflector (3), a support column (4) and a diffuser plate, and is fastened and assembled using the anti-shadow screws for the DLED backlight module; the anti-shadow screws pass through the reflector (3) and the support column (4) in sequence and are then locked to the back plate, and the white reflective coating (11) of the nut (1) faces the surface of the reflector (3).

[0009] The distance between the nut (1) and the surface of the reflector (3) is ≤0.5mm, so that the reflected light covers the screw installation area.

[0010] The light mixing distance OD of the LED light strip (6) is ≤20mm.

[0011] The support column (4) is made of transparent or semi-transparent material, and its height is matched with the light mixing distance.

[0012] The difference between the reflectivity of the reflective sheet (3) and the reflectivity of the white reflective coating (11) of the nut (1) is ≤15%.

[0013] A display device comprising the aforementioned DLED backlight module.

[0014] The advantages of this utility model are: 1. Eliminate backlight shadows and improve optical uniformity. The white coating on the nut (reflectivity ≥ 80%) has a reflectivity difference of ≤ 15% from that of the reflective sheet, ensuring that the screw position is highly consistent with the light reflection capability of the reflective sheet.

[0015] At low mixing distances (OD≤20mm), local shadows caused by abrupt changes in reflectivity are significantly reduced, improving the brightness uniformity of the display panel.

[0016] 2. Balancing appearance consistency with internal optical performance The threaded rod retains a black coating (paint / anodizing) to match the color of the housing back panel; the white coating on the nut faces only the inside of the backlight cavity.

[0017] The externally concealed screw holes maintain an aesthetically pleasing appearance, while the internal high-reflectivity nuts optimize light effects, resolving the contradiction of traditional screws that prioritize external appearance over internal functionality.

[0018] 3. Enhance assembly stability and optical path control precision The nut diameter should be greater than the reflector opening to ensure the reflector is tightly pressed against the support post; the distance between the nut and the reflector should be ≤0.5mm to ensure that the reflected light seamlessly covers the screw area.

[0019] To avoid optical path misalignment caused by loose assembly, and to minimize the obstruction of light by screws, thereby improving light utilization efficiency.

[0020] 4. Adapts to ultra-thin module designs, reducing manufacturing complexity. The support columns are made of transparent / semi-transparent materials and are highly matched to the light mixing distance to prevent the support structure from absorbing light; the two-color coating is achieved through conventional spray painting / electroplating processes.

[0021] It supports ultra-thin backlight solutions with OD≤20mm (such as TVs / monitors) and requires no additional special equipment, making mass production costs controllable. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the main structure of this utility model.

[0023] Figure 2 This is a schematic diagram showing the result when this utility model is used.

[0024] Figure 3 This is a schematic diagram of the DLED backlight module of this utility model. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as a result of the description. However, these embodiments are merely exemplary and do not constitute any limitation on the scope of the present invention. Those skilled in the art should understand that modifications or substitutions can be made to the details and form of the technical solution of the present invention without departing from the spirit and scope of the present invention, but all such modifications and substitutions fall within the protection scope of the present invention.

[0026] See Figures 1 to 3 This utility model relates to an anti-shadow screw for a DLED backlight module, comprising a nut 1 and a threaded rod 2 integrally formed with the nut 1. The nut 1 has a white reflective coating 11 on its surface, and the threaded rod 2 has a black coating 21 on its surface. The reflectivity of the white reflective coating matches the reflectivity of the reflective sheet within the backlight module. The diameter of the nut 1 is larger than the diameter of the mounting hole of the reflective sheet 3 in the backlight module.

[0027] The black coating 21 is a black spray paint layer or a black anodized layer; the white reflective coating 11 is a spray paint layer or an electroplated layer with a reflectivity ≥80%.

[0028] The advantages of the above structure can be summarized as follows: The surface of the nut is coated with a high-reflectivity white coating (≥80%), which is highly matched with the reflectivity of the reflective sheet, effectively eliminating local shadows caused by differences in reflectivity and significantly improving the brightness uniformity of the ultra-thin direct-lit backlight (OD≤20mm).

[0029] The threaded rod retains a black coating (painted or anodized) to match the color of the back panel of the casing, ensuring an aesthetically pleasing appearance. The white coating on the nut is applied only to the inside of the backlight cavity, resolving the contradiction of traditional screws that are "uniform on the outside but absorb light on the inside".

[0030] The nut diameter is larger than the reflector mounting hole to ensure that the reflector and support column are pressed tightly together, avoiding light path deviation caused by loosening; the distance between the nut and the reflector is ≤0.5mm, so that the reflected light can seamlessly cover the screw area and reduce light blockage.

[0031] The dual-color coating is achieved through conventional painting / electroplating processes, without the need for additional complex equipment; the transparent / semi-transparent support columns are matched with low light mixing distance (OD≤20mm), supporting mass production of ultra-narrow bezel modules with controllable costs.

[0032] Designs with a reflectivity difference of ≤15% are directly compatible with existing reflective sheet materials (such as high-brightness PET and silver reflective film) without the need for additional adjustments to the backlight architecture, making them suitable for display devices such as TVs and monitors.

[0033] This utility model also relates to a DLED backlight module, including a back plate, LED light strip 6, reflector 3, support column 4 and diffuser plate, which is fastened and assembled using the anti-shadow screws for the DLED backlight module; the anti-shadow screws pass through the reflector 3 and support column 4 in sequence and are then locked to the back plate, and the white reflective coating 11 of the nut 1 faces the surface of the reflector 3.

[0034] The mixing distance (OD) of the LED light strip 6 is ≤20mm. The white reflective nut of the anti-shadow screw is directly attached to the reflective sheet, with a reflectivity matching degree of ≤15%. In the ultra-thin module with OD≤20mm, the shadow at the screw position is completely eliminated, ensuring that there is no visible color difference between the dark field and the pure color image.

[0035] The screws simultaneously secure the reflector, support column, and back plate. The diameter of the nut is greater than the aperture of the reflector, reducing the need for additional fasteners and freeing up valuable space for a thinner overall design.

[0036] The distance between the nut 1 and the surface of the reflective sheet 3 is ≤0.5mm, ensuring that the reflected light covers the screw installation area. With a nut-reflective sheet distance ≤0.5mm, the reflected light seamlessly covers the screw area, preventing light leakage or secondary shadows. The transparent / semi-transparent support column does not absorb light, ensuring maximum utilization of LED light energy and improving overall luminous efficiency.

[0037] The support column 4 is made of transparent or semi-transparent material, and its height is matched with the light mixing distance.

[0038] The difference between the reflectivity of the reflective sheet 3 and the reflectivity of the white reflective coating 11 of the nut 1 is ≤15%.

[0039] A display device comprising the aforementioned DLED backlight module.

[0040] The working principle of this utility model is as follows: 1. Pre-installed LED light source The direct-lit LED strip 6 is first locked onto the metal back plate 5. The LED beads are equipped with lenses above them, and the light mixing distance OD≤20mm, forming a close-range point light source array.

[0041] 2. Install high reflectivity sheet The reflector 3 has several mounting holes, the diameter of which is slightly smaller than the diameter of the nut 1 of the anti-shadow screw; the reflectivity of the reflector surface is ≥90%.

[0042] 3. Insert transparent support columns Transparent / semi-transparent support columns 4 are fitted into the mounting holes of the reflector, with their height precisely equal to the designed light mixing distance OD, to support the diffuser plate 7 and maintain the cavity thickness.

[0043] 4. Through-lock with anti-shadow screws The anti-shadow screw is inserted from the front of the reflector: The nut has a white reflective coating 11 facing the reflective sheet; The threaded rod 2 is tightened after passing through the hole in the reflector, the hollow support column, and the threaded hole in the back plate in sequence. Nut diameter > aperture, tighten the reflector and support post; The distance between the nut and the surface of the reflector is ≤0.5mm to achieve a proper fit.

[0044] 5. Establish a highly consistent reflective surface The nut has a reflectivity of ≥80%, and the difference between its reflectivity and that of the reflective sheet is ≤15%. Optically, the two are considered to be "the same high-reflectivity plane," eliminating the local low-reflectivity dark spots caused by traditional black nuts.

[0045] 6. Light circulation and homogenization The light emitted by the LED point light source within the cavity: It is highly reflected upon first reaching the reflector / white nut area; Transparent support columns absorb almost no light, avoiding additional shadows; The light is reflected and diffused multiple times within a short distance of ≤20mm, eventually forming a uniform surface light source.

[0046] 7. Output uniform backlight The homogenized light passes through the diffuser plate 7 and various optical films, and enters the LCD panel, achieving a display effect with no shadows, high brightness, and high color consistency.

[0047] 8. Consistency in overall machine appearance The black coating 21 of the threaded rod 2 is the same color as the back panel of the housing, and only the black tail is visible from the outside, making the overall appearance simple and unified; all optical optimizations are hidden inside the backlight cavity, without affecting the industrial design.

[0048] This invention solves the problems of eliminating shadows internally, maintaining aesthetic appearance externally, and simple and reliable assembly in an ultra-thin direct-lit backlight structure.

[0049] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A shadow-proof screw for a DLED backlight module, comprising a nut (1) and a threaded rod (2) integrally formed with the nut (1), characterized in that, A white reflective coating (11) is provided on the surface of the nut (1), and a black coating (21) is provided on the surface of the threaded rod (2); the reflectivity of the white reflective coating matches the reflectivity of the reflective sheet in the backlight module.

2. The anti-shadow screw for DLED backlight modules according to claim 1, characterized in that, The black coating (21) is a black spray paint layer or a black anodized layer; the white reflective coating (11) is a spray paint layer or an electroplated layer with a reflectivity ≥80%.

3. The anti-shadow screw for a DLED backlight module according to claim 1 or 2, characterized in that, The diameter of the nut (1) is larger than the diameter of the mounting hole of the reflector (3) of the backlight module.

4. A DLED backlight module, comprising a backplate, LED strips (6), a reflector (3), a support column (4), and a diffuser plate, characterized in that, The anti-shadow screw fastening assembly for the DLED backlight module is described in any one of claims 1-3; the anti-shadow screw passes through the reflective sheet (3) and the support column (4) in sequence and is then locked to the back plate, and the white reflective coating (11) of the nut (1) faces the surface of the reflective sheet (3).

5. The DLED backlight module according to claim 4, characterized in that: The distance between the nut (1) and the surface of the reflector (3) is ≤0.5mm, so that the reflected light covers the screw installation area.

6. The DLED backlight module according to claim 4, characterized in that, The light mixing distance OD of the LED light strip (6) is ≤20mm.

7. The DLED backlight module according to claim 4, characterized in that, The support column (4) is made of transparent or semi-transparent material, and its height is matched with the light mixing distance.

8. The DLED backlight module according to claim 4, characterized in that, The difference between the reflectivity of the reflective sheet (3) and the reflectivity of the white reflective coating (11) of the nut (1) is ≤15%.

9. A display device, characterized in that: It includes the DLED backlight module as described in any one of claims 4-8.

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