High-brightness HUD backlight module

Abstract

The application relates to the technical field of semiconductor display backlight, in particular to a high-brightness HUD backlight module, which comprises a HUD backlight base and a cover plate, the HUD backlight base is internally provided with a substrate, the substrate is provided with Mini LED lamp beads, the upper side of the Mini LED lamp beads is provided with a lens plate, the upper side of the lens plate is provided with a Fresnel lens structure piece, wherein the Mini LED lamp beads are matched with the light structure of the lower plate surface of the lens plate, and the light structure of the upper plate surface of the lens plate is matched with concentric circle lines of the Fresnel lens structure piece. The HUD backlight of the application adopts the lens plate, which is located above the Mini LED lamp beads, converges and converts light into parallel light output. Compared with the prior art, the brightness and the definition are improved under the same number of lamp beads. Meanwhile, the problem of hexagonal dark lines is solved through a light suppression film, so that the HUD is higher in brightness, uniform in light emission, and clearer in display effect.

Description

Technical Field

[0001] This invention relates to the field of semiconductor display backlight technology, and more specifically to a high-brightness HUD backlight module. Background Technology

[0002] A head-up display (HUD), also known as a head-up display system, is a driver-centric, blind-operated, multi-functional instrument panel. Its main function is to project key driving information such as speed and navigation onto the windshield in front of the driver. This minimizes the need for the driver to look down or turn their head while driving, allowing them to directly see crucial driving information, thus improving driving convenience and safety.

[0003] However, a common problem with current head-up display systems is uneven brightness. This issue can cause visual disturbances for drivers when viewing projected information, thus affecting the driving experience. More seriously, this uneven brightness can distract drivers, increasing driving risks and ultimately impacting driving safety. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention discloses a high-brightness HUD backlight module to solve the aforementioned problems.

[0005] This invention is achieved through the following technical solution:

[0006] This invention provides a high-brightness HUD backlight module, including a HUD backlight base and a cover plate. The HUD backlight base has a substrate inside, and Mini LED beads are disposed on the substrate. A lens plate that cooperates with the Mini LED beads is disposed above the Mini LED beads, and a Fresnel lens structure is disposed above the lens plate. The surface light structure of the lens plate cooperates with the concentric circle pattern of the Fresnel lens structure.

[0007] Furthermore, the Fresnel lens structure is provided with a light suppression film.

[0008] Furthermore, the light-suppressing film is provided with suppression point A and suppression point B, wherein the radius of suppression point A is larger than the radius of suppression point B.

[0009] Furthermore, the suppression points B are arranged in a circular pattern with the suppression point A as the center, and the suppression point A corresponds to the center of the concentric circle pattern of the Fresnel lens structure.

[0010] Furthermore, the light-suppressing film is provided with an upper diffuser.

[0011] Furthermore, a lower diffuser is provided between the Fresnel lens structure and the lens plate.

[0012] Furthermore, the base is provided with mounting posts for mounting Fresnel lens components, diffusers, and cover plates.

[0013] Furthermore, the Mini LED beads are arranged in a matrix, and a heat-conducting layer is provided between the substrate and the Mini LED beads to improve heat dissipation efficiency.

[0014] Furthermore, the Mini LED beads are combined with the surface light structure of the lower plate of the lens plate, which is a light-concentrating structure used to focus the light from the corresponding Mini LED beads.

[0015] Furthermore, the upper plate surface light structure of the lens plate is a diffusing structure, which is used to diverge the light rays converged by the lower plate surface light structure of the lens plate by an angle γ and then emit them to the concentric circle pattern of the Fresnel lens structure, where the angle γ is tanγ≈OD / 0.5Pitch, where OD is the distance between the lens plate and the Fresnel lens structure, and Pitch is the maximum diameter of the concentric circle pattern in the Fresnel lens structure.

[0016] The beneficial effects of this invention are as follows:

[0017] The HUD backlight of this invention features a lens plate positioned above the Mini LED chips. The double-sided optical structure of this lens plate converges the light emitted by the chips and converts it into parallel light output via a Fresnel lens structure. Compared to existing MiniLED head-up displays, this invention significantly improves brightness and enhances product clarity with the same number of LED chips. Furthermore, this invention incorporates a light-suppressing film, effectively solving the hexagonal dark line problem that occurs during the use of traditional Fresnel lens structures. This results in a HUD with higher brightness, more uniform light emission, and a clearer display. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the high-brightness HUD backlight module structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the light-suppressing film structure of the present invention;

[0021] Figure 3 This is a schematic diagram of the light transmission principle of the lens plate in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the concentric circle texture structure of the Fresnel lens structure according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram illustrating the light-guiding principle of the lens plate and Fresnel lens structure in an embodiment of the present invention.

[0024] The labels in the diagram represent:

[0025] 1. Cover plate; 2. Upper diffuser plate; 3. Fresnel lens structure; 3.1. Suppression point A; 3.1. Suppression point B; 4. Lower diffuser plate; 5. HUD backlight base; 6. Lens plate; 7. Substrate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In one embodiment, reference is made to Figure 1 As shown, a high-brightness HUD backlight module is provided, including a HUD backlight base and a cover plate. The HUD backlight base has a substrate, and the substrate has Mini LED beads. Above the Mini LED beads, there is a lens plate that cooperates with the Mini LED beads. Specifically, the Mini LED beads and the light structure on the lens plate correspond to each other.

[0028] In this embodiment, a Fresnel lens structure is provided above the lens plate (see reference). Figure 3 As shown in the figure, the Mini LED lamp bead is matched with the surface light structure of the lower plate of the lens plate, and the surface light structure of the upper plate of the lens plate is matched with the concentric circle pattern of the Fresnel lens structure.

[0029] In one embodiment, the Fresnel lens structure is provided with a light suppression film; see reference. Figure 2 As shown, the light suppression film has suppression points A and B, wherein the radius of suppression point A is larger than the radius of suppression point B. Suppression points B are arranged in a circular pattern with suppression point A as the center, and suppression points A correspond to the centers of the concentric circular patterns of the Fresnel lens structure.

[0030] In this high-brightness HUD backlight module, the light suppression film significantly improves the contrast and clarity of the display. By setting suppression points of different radii on the Fresnel lens structure, the scattering and reflection of light can be effectively controlled, thereby reducing unnecessary halo and glare. Suppression point A, as a larger suppression area, is mainly responsible for absorbing and scattering the direct strong light from the Mini LED chips, while suppression point B, as a smaller suppression area, further refines and adjusts the light distribution, ensuring that the light passes evenly through the Fresnel lens structure, ultimately forming a clear image on the lens plate.

[0031] In addition, this high-brightness HUD backlight module includes a control circuit connected to the Mini LED beads on the substrate. The control circuit adjusts the brightness and color of the Mini LED beads to suit different display needs. By precisely controlling the luminous intensity of each Mini LED bead, fine-tuning of the brightness of the HUD display content can be achieved, thus maintaining good visibility under various ambient lighting conditions.

[0032] In practical applications, this HUD backlight module can be widely used in HUD systems for vehicles such as automobiles and airplanes. Its high brightness and high contrast characteristics ensure that drivers can clearly see the information displayed on the HUD under various lighting conditions, thereby improving driving safety and comfort. Furthermore, the module's compact design allows for easy integration into HUD systems of various sizes and shapes, providing more possibilities for future smart cockpit designs.

[0033] In one embodiment, an upper diffuser is provided on the light-suppressing film to enhance the display effect. Furthermore, a lower diffuser is provided between the Fresnel lens structure and the lens plate. This can further enhance the display effect.

[0034] In this embodiment, the base is provided with mounting posts, which are used to install Fresnel lens structural components, diffusers, and cover plates.

[0035] In one embodiment, the Mini LED beads are arranged in a matrix, and a heat-conducting layer is provided between the substrate and the Mini LED beads to improve heat dissipation efficiency.

[0036] In another embodiment, the Mini LED chips are arranged in a staggered layout. This layout further optimizes light distribution, reduces light spot phenomena, and thus improves the uniformity of the display effect. Furthermore, the staggered layout helps reduce thermal interference between adjacent chips, improving overall heat dissipation performance.

[0037] To further enhance the performance of the HUD backlight module, an intelligent temperature control system is introduced in this embodiment. This system can monitor the module's temperature in real time and automatically adjust the current of the Mini LED beads according to temperature changes to keep the module operating within its optimal temperature range. This intelligent temperature control mechanism not only extends the module's lifespan but also ensures the stability and reliability of the HUD display under extreme temperature conditions.

[0038] During the manufacturing process, this embodiment also places special emphasis on the module's sealing performance. By employing advanced sealing technology, the module's internal dustproof and waterproof rating meets the IP67 standard. This design allows the HUD backlight module to maintain normal operation even in harsh external environments, greatly expanding its application range and usage scenarios.

[0039] In one embodiment, reference is made to Figure 4 and 5 As shown, n1 and n2 represent the refractive indices of air and the lens plate, respectively. The lower plate surface light structure of the lens plate is a focusing structure, used to converge the light from the corresponding Mini LED beads. The upper plate surface light structure of the lens plate is a diffusing structure, used to diverge the light converged by the lower plate surface light structure of the lens plate by an angle γ and then emit it to the concentric circle pattern of the Fresnel lens structure, where the angle γ is tanγ≈OD / 0.5Pitch, where OD is the distance between the lens plate and the Fresnel lens structure, and Pitch is the maximum diameter of the concentric circle pattern in the Fresnel lens structure.

[0040] In the high-brightness HUD backlight module of this invention, the reliability and durability of the module are also considered. By setting a thermally conductive layer between the MiniLED chips and the substrate, not only is the heat dissipation efficiency improved, but the stability of the module under long-term operation is also ensured. The thermally conductive layer is usually made of a high thermal conductivity material, such as thermal adhesive or thermal grease, which can effectively conduct the heat generated by the LED chips to the substrate, and then dissipate the heat through the substrate, thereby avoiding the occurrence of local overheating.

[0041] The high-brightness HUD backlight module of this invention also has excellent environmental adaptability. Thanks to the use of high-brightness MiniLED chips and optimized optical design, the module maintains good display performance even in strong light environments. Furthermore, the module's compact design and sealing technology enable it to withstand various harsh external environments, such as high temperature, low temperature, humidity, and vibration, ensuring stable operation of the HUD system under all conditions.

[0042] In summary, the high-brightness HUD backlight module provided by this invention, through a series of innovative designs and optimizations, not only improves display brightness and uniformity but also enhances contrast and clarity, while ensuring the module's heat dissipation efficiency and environmental adaptability. These advantages make the HUD backlight module of this invention widely applicable in HUD systems of vehicles such as automobiles and airplanes, providing drivers with a safer and more comfortable driving experience.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-brightness HUD backlight module, comprising a HUD backlight base and a cover plate, wherein a substrate is disposed within the HUD backlight base, and Mini LED beads are disposed on the substrate, characterized in that, Above the Mini LED bead is a lens plate that cooperates with the Mini LED bead. Above the lens plate is a Fresnel lens structure. The upper surface of the lens plate has a light structure that cooperates with the concentric circle pattern of the Fresnel lens structure.

2. The high-brightness HUD backlight module according to claim 1, characterized in that, The Fresnel lens structure is provided with a light suppression film.

3. A high-brightness HUD backlight module according to claim 2, characterized in that, The light suppression film is provided with suppression point A and suppression point B, wherein the radius of suppression point A is larger than the radius of suppression point B.

4. A high-brightness HUD backlight module according to claim 3, characterized in that, The suppression points B are arranged in a circular pattern with the suppression point A as the center. The suppression points A correspond to the center of the concentric circular pattern of the Fresnel lens structure.

5. A high-brightness HUD backlight module according to claim 2, characterized in that, The light-suppressing film is provided with an upper diffuser.

6. A high-brightness HUD backlight module according to claim 1, characterized in that, A lower diffuser is provided between the Fresnel lens structure and the lens plate.

7. A high-brightness HUD backlight module according to claim 1, characterized in that, The base is provided with mounting posts, which are used to mount Fresnel lens components, diffusers, and cover plates.

8. A high-brightness HUD backlight module according to claim 1, characterized in that, The Mini LED beads are arranged in a matrix, and a heat-conducting layer is provided between the substrate and the Mini LED beads to improve heat dissipation efficiency.

9. A high-brightness HUD backlight module according to claim 1, characterized in that, The lower surface of the lens plate is provided with a light structure. The Mini LED lamp beads cooperate with the light structure on the lower surface of the lens plate. The light structure on the lower surface of the lens plate is a light-concentrating structure, which is used to focus the light of the corresponding Mini LED lamp beads.

10. A high-brightness HUD backlight module according to claim 1, characterized in that, The upper plate surface light structure of the lens plate is a diffusing structure, which is used to diverge the light rays converged by the lower plate surface light structure of the lens plate by an angle γ and then emit them to the concentric circle pattern of the Fresnel lens structure. The angle γ is tanγ≈OD / 0.5Pitch, where OD is the distance between the lens plate and the Fresnel lens structure, and Pitch is the maximum diameter of the concentric circle pattern in the Fresnel lens structure.

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