Backlight module and display device
By adopting an innovative design of reflector and diffusion layer in the Mini LED backlight module, the problems of gaps and halo crosstalk caused by diffuser arching are solved, achieving uniform light output and efficient utilization, and improving the optical performance of the backlight module.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU VISION NEW TECH CO LTD
- Filing Date
- 2025-05-09
- Publication Date
- 2026-05-12
AI Technical Summary
In existing Mini LED backlight modules, the diffuser plate is prone to arching, which can lead to gaps, light crosstalk, and halo effects, resulting in uneven optical performance.
The design employs a reflector and a diffusion layer. The reflector has multiple mutually separated reflective cavities to accommodate the light-emitting units. The diffusion layer is fixed to the side of the reflector away from the substrate and is connected by UV colloid to ensure that the diffusion layer and the reflector are tightly bonded and to avoid the formation of arched gaps.
It effectively suppresses halo and crosstalk phenomena, improves the optical performance of the backlight module, ensures uniform light output, and reduces light scattering and loss.
Smart Images
Figure CN224232076U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display technology, and in particular to a backlight module and a display device. Background Technology
[0002] In existing technologies, halo control of Mini LED backlight panels typically involves placing a diffuser plate on the light-emitting side of the light-emitting unit to achieve uniform light diffusion. However, when the entire unit is in an upright position, the diffuser plate is prone to arching, creating gaps between it and the reflective sheets around the light-emitting unit. These gaps allow light emitted by the LEDs to penetrate and interfere with the light fields of adjacent LEDs, resulting in crosstalk.
[0003] Furthermore, the uneven arching of the diffuser plate at different locations further exacerbates the non-uniformity of the halo and local dimming effects. This non-uniformity is particularly pronounced in different areas, severely impacting the overall optical performance of the system. Utility Model Content
[0004] This application provides a backlight module and a display device that can effectively suppress halo and crosstalk phenomena to improve the optical performance of the backlight module.
[0005] This application provides a backlight module, including:
[0006] substrate;
[0007] Multiple light-emitting units are disposed on the substrate;
[0008] A reflector connected to the substrate, the reflector having a plurality of mutually spaced reflective cavities, each of the reflective cavities corresponding to one of the light-emitting units;
[0009] A diffusion layer is fixed to the side of the reflector away from the substrate.
[0010] In some embodiments, the diffusion layer has a plurality of openings that expose a portion of the structure of the reflector; the backlight module further includes a fixing member that fixes the diffusion layer to the reflector through the openings.
[0011] In some embodiments, the fastener includes a UV colloid that fills an opening in the diffusion layer and is connected to the reflector.
[0012] In some embodiments, the reflector includes a plurality of interconnected lamp cups, each lamp cup including a bottom wall and a side wall, the bottom wall having a lamp hole, the light-emitting unit passing through the lamp hole, and the side wall being connected to the bottom wall and surrounding to form the reflective cavity.
[0013] In some embodiments, the edge of the sidewall away from the bottom wall is exposed in the opening of the diffusion layer.
[0014] In some embodiments, the opening extends in the same direction as the edge of the sidewall away from the bottom wall.
[0015] In some embodiments, the sidewall further has an edge disposed at the edge of the sidewall away from the bottom wall, the side of the edge near the diffusion layer being parallel to the side of the diffusion layer near the light-emitting unit, the edge abutting against the diffusion layer, and a portion of the structure of the edge being exposed in the opening of the diffusion layer.
[0016] In some embodiments, the sidewall near the reflective cavity is provided with protrusions or ridges.
[0017] In some embodiments, the sidewall of the lamp cup near the reflective cavity is an arc surface or a flat surface.
[0018] This application embodiment also provides a display device, including:
[0019] Backlight module, wherein the backlight module is the aforementioned backlight module;
[0020] The display panel is disposed on the light-emitting side of the backlight module.
[0021] The backlight module and display device provided in this application include a substrate, multiple light-emitting units, a reflector, and a diffusion layer. The multiple light-emitting units are disposed on the substrate, and the reflector is connected to the substrate. The reflector has multiple mutually spaced reflective cavities, each corresponding to one light-emitting unit. This design ensures that the light emitted by each light-emitting unit can be effectively reflected and focused, reducing light scattering and loss. The diffusion layer is fixed to the side of the reflector away from the substrate. The function of the diffusion layer is to further homogenize the light focused in the reflective cavities, ensuring uniform light output throughout the entire backlight module. The connection between the diffusion layer and the reflector ensures a tight fit between them, effectively suppressing gaps caused by the diffusion layer arching when the device is upright, thereby significantly improving the optical performance of the backlight module. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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 1This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application.
[0024] Figure 2 This is a schematic diagram of the diffusion layer provided in an embodiment of this application.
[0025] Figure 3 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application.
[0026] Figure 4 This is a schematic diagram of a third structure of the backlight module provided in an embodiment of this application.
[0027] Figure 5 This is a schematic diagram of a fourth structure of the backlight module provided in the embodiments of this application. Detailed Implementation
[0028] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0029] This application provides a backlight module and a display device that can effectively suppress halos and crosstalk phenomena, thereby improving the optical performance of the backlight module. The following description is in conjunction with the accompanying drawings.
[0030] Please see Figure 1 , Figure 1 This is a schematic diagram of a first structure of a backlight module provided in an embodiment of this application.
[0031] This application provides a backlight module 100, which is an indispensable part of display devices such as liquid crystal display (LCD) or organic light-emitting diode display (OLED, but mainly used here as an auxiliary component to provide backlight). Its main function is to provide uniform and sufficient light to the display panel to ensure that the picture is bright and the colors are vivid.
[0032] The backlight module 100 includes a substrate 10, multiple light-emitting units 20, a reflector 30, and a diffusion layer 40.
[0033] The substrate 10 can be a PCB (Printed Circuit Board). When the substrate 10 is a PCB, the circuits on the PCB can provide electrical signals to the light-emitting unit 20, enabling the light-emitting unit 20 to emit light. The substrate 10 can be rectangular, and the light-emitting units 20 can be arranged in an array on the substrate 10 or customized by the user according to their own needs. For example, the light-emitting units 20 can be arranged sequentially along the length of the substrate 10 to present a "I"-shaped arrangement.
[0034] The backlight module 100 not only provides a stable mounting platform for the light-emitting unit 20, but also undertakes the important tasks of circuit connection and signal transmission, ensuring that each light-emitting unit 20 can receive accurate control signals.
[0035] The light-emitting unit 20 is the light source in the backlight module 100. In this embodiment, high-efficiency and energy-saving light-emitting elements such as MiniLED chips can be used, with a size ranging from 50-200μm, and are fixed on the substrate 10 by eutectic bonding. These light-emitting units 20 are disposed on the substrate 10 and generate light by being excited by current to provide backlight for the display panel. The light-emitting unit 20 includes at least one LED chip. For example, the light-emitting unit 20 includes one or two LED chips. When the light-emitting unit 20 includes two LED chips, a reflector 30 is disposed over the two LED chips, and the light emitted by the two LED chips can be reflected by the reflector 30 to enter the diffusion layer 40; when the light-emitting unit 20 includes one LED chip, the light emitted by the one LED chip can be reflected by the reflector 30 to enter the diffusion layer 40.
[0036] The reflector 30 is used to efficiently reflect and focus the light emitted by the light-emitting unit 20, reduce light scattering and loss, and thus improve the utilization rate and uniformity of light.
[0037] The main function of the diffusion layer 40 is to further homogenize the light gathered in the reflective cavity 31, eliminate hot spots and dark areas in the light, and ensure that the light output of the entire backlight module 100 is uniform.
[0038] Multiple light-emitting units 20 are disposed on the substrate 10. The reflector 30 is connected to the substrate 10. The reflector 30 has multiple mutually spaced reflective cavities 31, each of which accommodates one light-emitting unit 20. The design of multiple reflective cavities 31 of the reflector 30 can ensure that the light from each light-emitting unit 20 can be effectively reflected and focused, while the diffusion layer 40 further homogenizes these lights and eliminates the non-uniformity in the light.
[0039] The diffusion layer 40 is fixed to the side of the reflector 30 away from the substrate 10, thus achieving relative fixation between the diffusion layer 40 and the reflector 30. The function of the diffusion layer 40 is to further homogenize the light gathered in the reflective cavity 31, ensuring uniform light output throughout the backlight module 100. More importantly, the connection between the diffusion layer 40 and the reflector 30 in this embodiment is specially designed to effectively suppress gaps caused by the diffusion layer 40 arching due to gravity when the device is upright. In traditional backlight modules 100, such gaps often cause light emitted from the light-emitting unit 20 to penetrate and interfere with the light field of adjacent light-emitting units 20, resulting in halos and crosstalk. However, this embodiment ensures a tight fit between the diffusion layer 40 and the reflector 30, effectively preventing gaps even when the device is upright, thereby significantly improving the optical performance of the backlight module 100.
[0040] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of the diffusion layer provided in an embodiment of this application. The diffusion layer 40 has multiple openings 41, which expose parts of the structure of the reflector 30 to provide visual alignment markings and also relieve internal stress in the diffusion layer 40, reducing stress concentration by 65% and preventing warping of the diffusion layer 40. Please continue reading. Figure 1 as well as Figure 3 , Figure 3 This is a schematic diagram of a second structure of the backlight module provided in an embodiment of this application. The backlight module 100 also includes a fixing member 50, which fixes the diffusion layer 40 and the reflector 30 through an opening 41. Specifically, a portion of the fixing member 50 can pass through the opening 41 to fix the diffusion layer 40 and the reflector 30.
[0041] In some cases, the fastener 50 includes a UV (Ultraviolet) colloid, a photosensitive acrylic adhesive with low shrinkage (<2%), high refractive index (n≈1.5), and rapid curing properties (curing time <5 seconds). The UV colloid fills the opening 41 of the diffusion layer 40 and connects to the reflector 30 to fix the relative position of the diffusion layer 40 and the reflector 30. When the diffusion layer 40 is fixed to the reflector 30, liquid UV adhesive is applied to the opening 41 and the diffusion layer 40, and subsequently cured by UV light to fix the relative position of the diffusion layer 40 and the reflector 30.
[0042] Please continue reading. Figure 1 as well as Figure 4 , Figure 4This is a schematic diagram of a third structure of the backlight module provided in this application embodiment. The reflector 30 is the core optical component in the backlight module 100, and is made of high-reflectivity aluminum alloy (reflectivity ≥92%) or aluminized plastic. The reflector 30 includes multiple interconnected lamp cups 32, which are manufactured as a single unit through precision stamping or injection molding processes. Each lamp cup 32 includes a bottom wall 321 and a side wall 322. The bottom wall 321 has a lamp hole 3212, through which the light-emitting unit 20 passes to be disposed within the reflective cavity 31. The side wall 322 is connected to the bottom wall 321 and together they enclose the reflective cavity 31.
[0043] When the lamp cup 32 is cylindrical, frustum-shaped, or trumpet-shaped, the bottom wall 321 is circular, and the side wall 322 is curved; when the lamp cup 32 is prismatic or frustum-shaped, such as Figure 1 as well as Figure 4 The bottom wall 321 is rectangular, and the side wall 322 of the lamp cup 32 near the reflector cavity 31 can be an arc surface or a plane, such as an inwardly concave arc surface or an outwardly convex arc surface.
[0044] Along the direction from the light-emitting unit 20 to the diffusion layer 40, the cross-sectional area of the reflective cavity 31 gradually increases, for example, it is horn-shaped. It is understood that the gradual increase in the cross-sectional area of the reflective cavity 31 allows for a larger area of the diffusion layer 40 acted upon by each light-emitting unit 20, which is beneficial for improving effective illumination efficiency. Optionally, along the direction from the light-emitting unit 20 to the diffusion layer 40, the cross-sectional area of the reflective cavity 31 is circular or rectangular. For example, when the reflective cavity 31 is frustum-shaped, its cross-section is circular; when the reflective cavity 31 is frustum-shaped, its cross-section is rectangular.
[0045] The side wall 322 and the bottom wall 321 form a preset angle, for example, the preset angle between the side wall 322 and the bottom wall 321 can be 30 degrees, 60 degrees or 90 degrees. The bottom wall 321 is connected to the substrate 10 so that the reflector 30 can be fixed on the substrate 10.
[0046] The lamp hole 3212 of the bottom wall 321 can be set at the exact center of the bottom wall 321. When multiple side walls 322 are symmetrical about the light-emitting unit 20, the reflection effect of the light generated by the light-emitting unit 20 by the side walls 322 is the same.
[0047] Each sidewall 322 forms the same angle with the sidewall 322 of the diffuser layer 40 near the light-emitting unit 20. It can be understood that since the light emitted by the light-emitting unit 20 is symmetrically divergent, the fact that each sidewall 322 forms the same angle with the sidewall 322 of the diffuser layer 40 near the light-emitting unit 20 ensures that the light emitted by the light-emitting unit 20, after being reflected by the sidewall 322 of the lamp cup 32, enters the diffuser layer 40 at the same angle. This facilitates the separation of the transmission paths of the light emitted by multiple light-emitting units 20 within the diffuser layer 40.
[0048] In some embodiments, please refer to Figure 3 , Figure 4 as well as Figure 5 , Figure 5 This is a schematic diagram of a fourth structure of the backlight module provided in this application embodiment. When multiple lamp cups 32 are connected, the edges of the sidewalls 322 of adjacent lamp cups 32 are connected to each other to form a reflector 30. The side of the sidewall 322 away from the bottom wall 321 forms an edge, and the opening 41 of the diffusion layer 40 can expose the edge of the sidewall 322. That is, the edge of the sidewall 322 away from the bottom wall 321 is exposed in the opening 41 of the diffusion layer 40, so that the fixing member 50 can both pass through the opening 41 to jointly fix the diffusion layer 40 and the reflector 30, and also avoid blocking the light.
[0049] The opening 41 extends in the same direction as the edge of the side wall 322 away from the bottom wall 321, so as to increase the exposed area of the edge and thus improve the reliability of the fixation.
[0050] Please continue reading. Figure 4 The sidewall 322 also has an edge 3221, which is located at the edge of the sidewall 322 away from the bottom wall 321. The side of the edge 3221 near the diffuser layer 40 is parallel to the side of the diffuser layer 40 near the light-emitting unit 20. The edge 3221 abuts against the diffuser layer 40, and part of the structure of the edge 3221 is exposed in the opening 41 of the diffuser layer 40. When multiple lamp cups 32 are connected, the edges 3221 of the sidewalls 322 of adjacent lamp cups 32 are connected to each other to form a reflector 30.
[0051] Understandably, to increase the contact area between the lamp holder 32 and the diffuser layer 40, the reflector 30 is provided with an edge 3221 to increase the contact area with the diffuser layer 40, reduce pressure, and prevent damage to the diffuser layer 40. Since part of the structure of the edge 3221 is exposed in the opening 41 of the diffuser layer 40, it can provide a support platform for the fastener 50 and increase the contact area with the fastener 50. This not only simplifies the installation process of the fastener 50 and improves assembly efficiency, but also strengthens the connection between the fastener 50 and the reflector 30 and the diffuser layer 40, making the entire lighting equipment more stable and reliable during use.
[0052] In some embodiments, the sidewall 322 is provided with protrusions or ridges on the side near the reflective cavity 31. The protrusions or ridges enhance the reflection of light generated by the light-emitting unit 20, further change the directionality of the light, thereby making the light diffusion uniformity better, reducing the occurrence of dark grid problems, and thus improving the brightness uniformity of the display.
[0053] In some embodiments, when the lamp cup 32 is made of metal, the thickness of the side wall 322 of the lamp cup 32 is increased, which helps the reflector 30 to dissipate the heat generated by the light-emitting unit 20 in a timely manner and extend the life of the backlight module 100.
[0054] If the lamp cup 32 is made of plastic, it also includes a reflective sheet covering the interior of the lamp cup 32. This reflective sheet is configured to reflect a portion of the light generated by the light-emitting unit 20. For example, the lamp cup 32 can be made of polycarbonate (PC), acrylonitrile butadiene styrene plastic (ABS), etc. When the lamp cup 32 is made of plastic, the manufacturing process can be injection molding or extrusion molding. This molding process allows for mass production, which helps reduce costs.
[0055] In some embodiments, the backlight module 100 further includes a heat sink disposed between the lamp cup 32 and the substrate 10 and connected to the lamp cup 32, and the heat sink is capable of dissipating heat for the light-emitting unit 20.
[0056] This application provides a display device. As a communication interface between users and information, the display device has become the mainstream display method due to its superior characteristics such as high space utilization, low electromagnetic interference and no radiation. It is widely used in information communication tools such as televisions, smartphones, and tablets. In this device, the display panel itself does not emit light, but a backlight module provides the light source for the display panel.
[0057] The display device can be at least one of the following: television, smartphone, tablet computer, mobile phone, video phone, e-book reader, desktop PC, laptop PC, netbook computer, workstation, server, personal digital assistant, portable multimedia player, MP3 player, mobile medical device, camera, game console, digital camera, car navigation system, electronic billboard, ATM, or wearable device.
[0058] This application mainly uses a television set as an example to illustrate the display device. The display device includes a backlight module 100 and a display device. The backlight module 100 is the same as the backlight module 100 in the above embodiment, and the display panel is disposed on the light-emitting side of the backlight module 100.
[0059] The backlight module 100 and display device provided in this application embodiment include a substrate 10, a plurality of light-emitting units 20, a reflector 30, and a diffusion layer 40. The plurality of light-emitting units 20 are disposed on the substrate 10, and the reflector 30 is connected to the substrate 10. The reflector 30 has a plurality of mutually spaced reflective cavities 31, each of which accommodates one light-emitting unit 20. This design ensures that the light emitted by each light-emitting unit 20 can be effectively reflected and focused, reducing light scattering and loss. The diffusion layer 40 is fixed to the side of the reflector 30 away from the substrate 10. The function of the diffusion layer 40 is to further homogenize the light focused in the reflective cavities 31, ensuring uniform light output throughout the backlight module 100. The diffusion layer 40 is connected to the reflector 30, effectively suppressing gap problems caused by the diffusion layer 40 arching when the device is upright. This application embodiment uses an innovative connection method to ensure a tight fit between the diffusion layer 40 and the reflector 30, effectively preventing gaps even when the whole unit is upright, thereby significantly improving the optical performance of the backlight module 100.
[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0061] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features.
[0062] The backlight module and display device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
Claims
1. A backlight module, characterized in that, include: substrate; Multiple light-emitting units are disposed on the substrate; A reflector connected to the substrate, the reflector having a plurality of mutually spaced reflective cavities, each of the reflective cavities corresponding to one of the light-emitting units; A diffusion layer is fixed to the side of the reflector away from the substrate.
2. The backlight module according to claim 1, characterized in that, The diffusion layer has multiple openings that expose a portion of the structure of the reflector; the backlight module also includes a fixing member that fixes the diffusion layer and the reflector through the openings.
3. The backlight module according to claim 2, characterized in that, The fastener includes a UV colloid that fills the opening in the diffusion layer and is connected to the reflector.
4. The backlight module according to claim 2, characterized in that, The reflector includes a plurality of interconnected lamp cups, each of which includes a bottom wall and a side wall. The bottom wall has a lamp hole, through which the light-emitting unit passes. The side wall is connected to the bottom wall and together forms the reflective cavity.
5. The backlight module according to claim 4, characterized in that, The edge of the sidewall away from the bottom wall is exposed at the opening of the diffusion layer.
6. The backlight module according to claim 5, characterized in that, The opening extends in the same direction as the edge of the sidewall away from the bottom wall.
7. The backlight module according to claim 5, characterized in that, The sidewall also has an edge portion disposed at the edge of the sidewall away from the bottom wall. The side of the edge portion near the diffusion layer is parallel to the side of the diffusion layer near the light-emitting unit. The edge portion abuts against the diffusion layer, and a portion of the structure of the edge portion is exposed in the opening of the diffusion layer.
8. The backlight module according to claim 4, characterized in that, The sidewall near the reflective cavity is provided with protrusions or ridges.
9. The backlight module according to claim 4, characterized in that, The side wall of the lamp cup near the reflective cavity is either curved or flat.
10. A display device, characterized in that, include: A backlight module, wherein the backlight module is the backlight module according to any one of claims 1 to 9; The display panel is disposed on the light-emitting side of the backlight module.