High-contrast Mini-LED backlight module
By designing a special light-concentrating structure on the injection molded diffusion plate of the Mini-LED backlight module, blocking large-angle light, solving the halo and grid-like stripes problems, and achieving high contrast and uniformity backlight module performance.
Patent Information
- Application Number
- CN202421291733.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-06
AI Technical Summary
There is halo in the Mini-LED backlight module, which causes blur and flooding of the edges of the picture, affecting clarity and contrast. When used in combination with conventional diffusion plates, the existing reflector structure cannot effectively block light, resulting in grid-like light and dark stripes, affecting the display effect.
A high-contrast Mini-LED backlight module is designed, which adopts a special light-concentration structure on the injection molded diffusion plate to accurately correspond to the ridge position of the reflective cover, blocking the light propagated at a large angle, and ensuring that the light mainly emits above the ridge of the reflective cover.
The display halo phenomenon is significantly optimized, and the performance of ultra-high contrast backlight modules is achieved, which eliminates the problem of grid-like display light and dark stripes, reduces the requirements for reflective cover structural design, simplifies the production process and optimizes the cost structure.
Smart Images
Figure CN222618930U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of liquid crystal display, and in particular to a high-contrast Mini-LED backlight module. Background Art
[0002] The emergence of Mini-LED, an innovative technology, has further reduced the size of traditional LED lamp beads, making the overall light source layout more precise and detailed. This miniaturized design not only brings better display effects, but also provides the possibility for fine control of the backlight source. However, with the widespread application of Mini-LED technology, the halo phenomenon has gradually become a problem that needs to be solved urgently.
[0003] The halo phenomenon refers to the phenomenon that the edges of the picture appear blurred or flooded due to the uneven distribution or reflection of the backlight during the display process. This not only affects the clarity and contrast of the picture, but also reduces the user's visual experience. In order to solve this problem, the current common practice is to reduce the halo by adding a reflective cover. As a special structure, the reflective cover can effectively absorb and disperse excess light, thereby reducing the generation of halo.
[0004] However, although the reflector can alleviate the halo problem to a certain extent, its structure itself brings some new challenges. Since the reflector has a certain height, when it is used in combination with a conventional diffuser, it often cannot achieve an effective shielding effect. This results in the easy appearance of grid-like light and dark stripes during the display process, which seriously affects the overall performance of the picture. Utility Model Content
[0005] In view of the deficiencies in the prior art, the utility model discloses a high-contrast Mini-LED backlight module for solving the above-mentioned problems.
[0006] The utility model is realized through the following technical solutions:
[0007] The utility model provides a high-contrast Mini-LED backlight module, including a Mini-LED light board, a reflective cover is arranged on the Mini-LED light board, an injection-molded diffusion plate is arranged directly above the reflective cover, wherein a first light-focusing structure along the X direction and a second light-focusing structure along the Y direction are arranged on a side of the injection-molded diffusion plate close to the reflective cover, and the connection between the first light-focusing structure and the second light-focusing structure constitutes a third light-focusing structure.
[0008] Furthermore, the reflective cover includes a reflective cavity, a ridge structure around the reflective cavity, a cavity ridge structure connecting structure and a ridge peak structure.
[0009] Furthermore, the X-direction and Y-direction ridge structures of the reflector correspond to the first light-concentrating structure and the second light-concentrating structure respectively.
[0010] Furthermore, the prism structure is composed of at least one reflective cavity connected together.
[0011] Furthermore, the prism structure corresponds to the third light-focusing structure.
[0012] Furthermore, the lamp beads on the Mini-LED lamp board are located in the reflective cavity of the reflective cover.
[0013] Furthermore, the first light-concentrating structure, the second light-concentrating structure and the third light-concentrating structure are protruded from the surface of the injection-molded diffusion plate.
[0014] Furthermore, the upper surface of the Mini-LED light panel is coated with a reflective coating, a color conversion film, a prism brightness enhancement film group and a polarization brightness enhancement film.
[0015] The beneficial effects of the utility model are:
[0016] The utility model aims to replace the currently widely used flat diffuser. Through the carefully designed special light-gathering structure of the injection-molded diffuser, the position of the ridge of the reflector is precisely matched, effectively blocking the light propagating at a large angle from entering the adjacent partition, thereby ensuring that the light is mainly emitted above the ridge of the reflector. This significantly optimizes the display halo phenomenon and achieves ultra-high contrast backlight module performance.
[0017] At the same time, the utility model successfully eliminates the problem of light and dark stripes in the grid-like display caused by the ridge structure, effectively shields the reflective cover structure, thereby reducing the requirements for the reflective cover structure design, simplifying the manufacturing process, and optimizing the cost structure, thereby meeting the diverse needs of more products and users.
[0018] The utility model uses the excellent shielding ability of the new diffusion plate and the precise light separation effect of the reflective cover to jointly construct a high-contrast, high-uniformity Mini-LED backlight module, providing strong support for the further development of display technology. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1It is a schematic diagram of the reflector cover and the diffuser plate of the embodiment of the utility model unfolded in the Z direction;
[0021] Figure 2 It is a schematic diagram of the propagation trajectory of light in the reflector cavity of the embodiment of the utility model;
[0022] Figure 3 This is a schematic diagram of the light-gathering structure of the injection-molded diffuser plate of the utility model embodiment;
[0023] Figure 4 This is a diagram of a conventional diffuser plate Mini-LED backlight according to an embodiment of the utility model;
[0024] Figure 5 This is a simulation diagram of the display effect of the Mini-LED backlight with a conventional diffusion plate in the embodiment of the utility model;
[0025] Figure 6 This is a diagram of the Mini-LED backlight using a conventional diffusion plate in the utility model;
[0026] Figure 7 This is a simulation diagram of the display effect of Mini-LED backlight using a conventional diffusion plate in the utility model;
[0027] Figure 8 This is a simulation diagram of the Mini-LED backlight halo effect of a conventional diffusion plate in an embodiment of the utility model;
[0028] Fig. 9 This is a simulation diagram of the Mini-LED backlight halo effect using a conventional diffusion plate in the utility model;
[0029] Fig.10 This is a comparison diagram of the new and conventional backlight halo A in the embodiment of the utility model. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0031] Example 1
[0032] Please refer to Figure 1As shown, this embodiment aims to provide a Mini-LED backlight module with significantly improved high contrast. The inner reflector 200 is placed above the light board 100 and is tightly connected by double-sided tape to ensure the stability of the structure. In addition, the new injection-molded diffuser plate 300 is placed directly above the reflector 200, perfectly covering the entire opening area of the reflector, thereby effectively improving the optical performance of the backlight module.
[0033] Specifically, if Figure 2 As shown, the design of the internal structure of the reflector is also ingenious. It includes a ridge structure 201 around the reflective cavity, which can accurately guide light and reduce light loss. At the same time, the cavity ridge structures are firmly connected by a connecting structure 202 to ensure that the overall structure of the reflector is stable and reliable. In addition, the ridge peak structure 203 formed by connecting multiple cavities not only enhances the structural strength of the reflector, but also further improves the distribution and uniformity of light.
[0034] We also pay attention to details and innovation in the design of the new injection-molded diffuser plate 300. On the side close to the reflector, we set a special first light-gathering structure 301 along the X direction and a second light-gathering structure 302 in the Y direction. These two light-gathering structures play a key role in the control and guidance of light, and can effectively improve the lighting effect of the backlight module. At the same time, the first light-gathering structure 301 and the second light-gathering structure 302 cleverly form a third light-gathering structure 303 at the connection point. This design further enhances the light-gathering effect, making the lighting of the entire backlight module more uniform and soft.
[0035] It is worth mentioning that the first light-concentrating structure 301, the second light-concentrating structure 302 and the third light-concentrating structure 303 described in this embodiment are all protruded from the surface of the injection-molded diffuser plate 300. This design not only enhances the three-dimensional sense and layered sense of the light-concentrating structure, but also enables more complex refraction and reflection of light when passing through these structures, thereby further improving the optical performance of the backlight module.
[0036] In addition, in order to give full play to the performance of the LED light source 101, we place it in the reflective cavity. In this way, the light emitted by the LED light source can pass through the dual effects of the reflector and the diffuser to obtain a more uniform and soft illumination effect. At the same time, this design can also effectively reduce light loss and improve the luminous efficiency of the backlight module.
[0037] In summary, the high-contrast Mini-LED backlight module provided in this embodiment has significant advantages in structural design, optical performance, luminous efficiency, etc. It can not only provide a clearer and more vivid visual effect for the display device, but also reduce energy consumption and extend service life, injecting new vitality into the development of modern display technology.
[0038] Example 2
[0039] Based on Example 1, refer to Figure 1 As shown, since there is a Z-direction gap between the reflector ridge 201 and the diffuser, the large-angle emergent light can propagate to the adjacent partition through the gap, thereby reducing the limiting effect of the reflector on the partition light and increasing the halo value.
[0040] In particular, due to the limitations of process processing capabilities, the top of the ridge has a certain width, and the closer the top of the ridge is to the diffuser, the less light is emitted from this position, resulting in light and dark stripes between the partitions, which are difficult to completely block with conventional film combinations.
[0041] Reference Figure 2 and 3 As shown, the light-collecting structure 301 of the novel injection-molded diffuser plate of this embodiment protrudes from the lower surface of the diffuser plate in the reverse direction along the Z direction, corresponding to the ridge of the reflector.
[0042] In this embodiment, the ridge structure 201 cooperates with the first light-concentrating structure 301 to compress the Z-direction gap between the reflector 200 and the injection-molded diffuser plate 300, blocking the light that could have propagated to the adjacent partitions at a large angle (dotted arrows), and causing it to be incident on the diffuser plate above the ridge (solid arrows), thereby converting the "harmful" light that affects the halo into "beneficial" light that eliminates light and dark stripes and improves display uniformity.
[0043] The relationship between the width w of the structure in the Y direction and the bottom width L of the ridge in this embodiment is: w=a*L (0<a≤1); the relationship between the height h of the focusing structure and the ridge height H, and the backlight mixing distance d is: h+H<d.
[0044] As a preferred embodiment of the present invention, the shape of the focusing structure on the ZY cross section can be, but is not limited to, an arc, a triangle, a rectangle, a quadratic curve, etc.
[0045] Example 3
[0046] In specific applications, referring to the solution described in Example 1, we can further explore a method for implementing Mini-LED backlight using a conventional diffusion plate. Figure 4 As shown, this is a typical Mini-LED backlight schematic diagram, and its backlight module includes a plurality of backlight source LEDs 101, and these LED lamp beads are closely arranged on a lamp board 100. The lamp board is placed under the reflector 200, and a reflective coating is coated on the surface of the lamp board to enhance the reflection effect of light.
[0047] Above the reflector, there are arranged in sequence a conventional diffuser 600, a color conversion film 400, a prism enhancement film set 500, and a polarization brightness enhancement film 700. These films work together to achieve a uniform and soft backlight effect. The main function of the conventional diffuser is to diffuse the light emitted by the LED to make the light distribution more uniform; the color conversion film is responsible for converting the white light emitted by the LED into the required color light; the prism enhancement film set further enhances the brightness of the backlight by changing the propagation direction of the light; finally, the polarization brightness enhancement film is used to increase the brightness and contrast of the backlight.
[0048] In order to more intuitively demonstrate the backlight display effect, we conducted a simulation test. Figure 5 As shown, through simulation tests, we can see that the display effect of the backlight module is excellent, with bright colors and uniform brightness.
[0049] However, in practical applications, we found that there are some problems with using conventional diffuser plates. Figure 6 and Figure 7 As shown, when we Figure 4 When the conventional diffuser plate 600 in the architecture is replaced with the new injection-molded diffuser plate 300 described in the patent, the display effect of the backlight module is significantly optimized. In the display image, the original light and dark stripes completely disappear, and the image display becomes clearer and more delicate.
[0050] In order to better understand the advantages of the new diffuser, we also conducted halo distribution tests. Figure 8 and Fig. 9 The following are the halo distribution diagrams of the conventional diffuser and the new diffuser. As can be seen from the figure, the halo distribution of the backlight of the conventional diffuser is significantly greater than that of the new diffuser. This means that the conventional diffuser is less capable of limiting the light within this partition, which easily causes light leakage and diffusion; while the new diffuser can better control the distribution of light and reduce the occurrence of halo phenomenon.
[0051] To further verify the performance advantages of the new diffuser, we also tested it according to Nichia Chemical's Halo A calculation standard. This standard takes the 3×3 partitions in the center of the backlight, lights up the center partition as L1, and calculates the brightest value of the remaining 8 partitions as Lmax, Halo A = Lmax / L1. Through testing, we found that the Halo A of the backlight of the new injection molded diffuser is reduced by nearly 20% compared to the conventional diffuser. Fig.10 As shown, this result fully demonstrates the significant advantages of the new diffuser in reducing halo and improving display contrast.
[0052] In summary, the application of the new injection-molded diffuser plate in Mini-LED backlight modules has significant advantages. By optimizing the structure and diaphragm configuration of the backlight module, the new diffuser plate can achieve a more uniform and soft backlight effect, while reducing the occurrence of halo phenomenon and improving display contrast and image quality. The application of this technology will bring new breakthroughs and progress to the development of Mini-LED backlight technology.
[0053] In summary, the utility model provides a novel injection molded diffuser plate, which blocks the light propagating into the adjacent partition at a large angle by designing a special focusing structure corresponding to the ridge position of the reflector on the injection molded diffuser plate, so that the light is emitted above the ridge of the reflector, optimizes the display halo, reduces the halo A effect by 20%, and obtains an ultra-high contrast backlight module. The cross-sectional shape of the focusing structure can be, but is not limited to, an arc, a triangle, a rectangle, a quadratic curve, etc.
[0054] Therefore, the utility model aims to replace the currently widely used flat diffuser plate, and through the carefully designed special light-gathering structure of the injection-molded diffuser plate, the position of the reflector ridge is precisely matched, effectively blocking the light propagating at a large angle from entering the adjacent partition, thereby ensuring that the light is mainly emitted above the reflector ridge. This significantly optimizes the display halo phenomenon and achieves ultra-high contrast backlight module performance.
[0055] At the same time, the utility model successfully eliminates the problem of light and dark stripes in the grid-like display caused by the ridge structure, effectively shields the reflective cover structure, thereby reducing the requirements for the reflective cover structure design, simplifying the manufacturing process, and optimizing the cost structure, thereby meeting the diverse needs of more products and users.
[0056] The utility model uses the excellent shielding ability of the new diffusion plate and the precise light separation effect of the reflective cover to jointly construct a high-contrast, high-uniformity Mini-LED backlight module, providing strong support for the further development of display technology.
[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A high contrast Mini-LED backlight module, comprising a Mini-LED light board, characterized in that: A reflective cover is arranged on the Mini-LED lamp panel, and an injection-molded diffuser plate is arranged directly above the reflective cover, wherein a first light-focusing structure along the X direction and a second light-focusing structure along the Y direction are arranged on a side of the injection-molded diffuser plate close to the reflective cover, and the connection between the first light-focusing structure and the second light-focusing structure constitutes a third light-focusing structure.
2. A high contrast Mini-LED backlight module according to claim 1, characterized in that: The reflective cover comprises a reflective cavity, a ridge structure around the reflective cavity, a cavity ridge structure connecting structure and a ridge peak structure.
3. A high contrast Mini-LED backlight module according to claim 2, characterized in that: The X-direction and Y-direction ridge structures of the reflector correspond to the first light-concentrating structure and the second light-concentrating structure respectively.
4. The high contrast Mini-LED backlight module according to claim 2, characterized in that: The prism structure is composed of at least one reflective cavity connected together.
5. The high contrast Mini-LED backlight module according to claim 4, characterized in that: The prism peak structure corresponds to the third light-condensing structure.
6. The high contrast Mini-LED backlight module according to claim 1, characterized in that: The lamp beads on the Mini-LED lamp board are located in the reflective cavity of the reflective cover.
7. The high contrast Mini-LED backlight module according to claim 1, characterized in that: The first light-concentrating structure, the second light-concentrating structure and the third light-concentrating structure are protruded from the surface of the injection-molded diffusion plate.
8. The high contrast Mini-LED backlight module according to claim 1, characterized in that: The upper surface of the Mini-LED light panel is coated with a reflective coating, a color conversion film, a prism brightness enhancement film group and a polarization brightness enhancement film.