PGU backlight architecture of vehicle-mounted HUD
By optimizing the PGU backlight architecture of the vehicle HUD, and using coaxially arranged lenses and low-power LED light groups, the problems of poor contrast, low brightness and high power consumption in the existing technology have been solved, resulting in clearer and more uniform image display and reduced costs.
Patent Information
- Application Number
- CN202520571604.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-03-27
AI Technical Summary
The existing TFT-based automotive HUD PGU backlight architecture suffers from poor contrast, low brightness, high power consumption, and difficulty in thermal management.
The system employs a coaxial PCB, LED light group, parallel light lens, beam splitter lens, and diffuser lens structure. It utilizes a freeform surface lens array to precisely control the light, and combines multiple low-power LEDs to optimize light distribution and diffusion effects.
It improves image clarity and uniformity, reduces energy consumption and overall structural costs, and enhances display performance under different lighting conditions.
Smart Images
Figure CN223814592U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of optical elements, in particular to a PGU backlight architecture of a vehicle-mounted HUD. BACKGROUND
[0002] A vehicle-mounted HUD (Head-Up Display, HUD for short) is a display technology used in vehicles, which displays key information (such as vehicle speed, navigation instructions, warning information, etc.) on the front windshield, so that the driver can obtain important information without looking down at the instrument panel or other interfaces. The PGU (Picture Generation Unit) is one of the core components of the HUD system, responsible for generating and controlling the image displayed on the windshield. The PGU backlight architecture optimizes the display effect of the image by controlling the brightness and distribution of the backlight. The backlight usually uses LED or other light sources, and through precise optical design, ensures that the image can be clearly visible in different light environments.
[0003] The TFT architecture PGU is the current mainstream HUD solution. This architecture uses LED backlight to emit light, and the electric field controls the rotation direction of the liquid crystal branches between the two substrates to change the direction of light travel and the color presented, thereby projecting the image. It has the advantages of low cost and high maturity. However, it also has the problems of poor contrast and sunlight backflow, and low brightness, low contrast, high power consumption and difficult thermal management, which greatly hinder the use of PGU architecture. CONTENT OF THE UTILITY MODEL
[0004] In order to overcome the shortcomings of the existing PGU backlight architecture of the vehicle-mounted HUD in use, the structure of the TFT architecture PGU system is improved, and the PGU backlight architecture of the vehicle-mounted HUD is provided.
[0005] The PGU backlight architecture of the vehicle-mounted HUD provided by the present application adopts the following technical solution:
[0006] A PGU backlight architecture of a vehicle-mounted HUD, comprising a PCB, a LED lamp group, a parallel light lens, a light splitting lens and a diffusion lens arranged in sequence and coaxially,
[0007] The LED lamp group is installed on the PCB and is used for emitting light and forming a projected image;
[0008] The parallel light lens is used for collimating the light rays of the image emitted by the LED;
[0009] The light splitting lens is used for secondary distribution of the collimated light rays to expand the illumination area of the light rays;
[0010] The diffusion lens is used for diffusing the light rays and making the formed image more uniform to improve the visual light effect.
[0011] The cross section of the light splitting lens is in V-shaped structure, and the side of the light splitting lens close to the PCB is a plane, the included angle of the V-shaped structure of the light splitting lens is greater than or equal to 90°, and the inner side edge of the light splitting lens is continuously provided with a plurality of tooth-shaped surfaces with trapezoidal cross sections inwardly for forming the reflection effect of light.
[0012] Optionally, the diffusion lens is further provided with a diffusion film away from the side of the light splitting lens.
[0013] Optionally, the LED lamp group comprises a plurality of small-power LED small lamps, and the plurality of LED small lamps are arranged in a single row or a double row.
[0014] Optionally, the parallel light lens is one of a TIR lens or a collimating lens.
[0015] Optionally, the diffusion lens is one of a compound eye lens or a right-angled prism.
[0016] Optionally, the inner side surface and the outer side surface of the light splitting lens are a plane or a curved surface, and the reference surface of the diffusion lens is a plane or a curved surface.
[0017] In summary, the present application comprises at least one of the following beneficial technical effects:
[0018] 1. Because the free-form surface lens array is used to accurately control the light of the LED, the light splitting lens performs free distribution of light, and different required light intensity distributions can be achieved.
[0019] 2. The plurality of small-power LEDs are used to replace the high-power LED, and the overall LED energy consumption cost is also reduced.
[0020] 3. Because the reflective cup coating is not needed, the overall structural cost of the PGU backlight structure can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 is the overall structure schematic diagram of the TIR lens scheme of the PGU backlight structure of the vehicle-mounted HUD of the present application.
[0022] Figure 2 is Figure 1 the enlarged view of A in
[0023] Figure 3 is the overall structure schematic diagram of the collimating lens scheme of the PGU backlight structure of the vehicle-mounted HUD of the present application.
[0024] Explanation of reference signs: 1, PCB; 2, LED lamp group; 21, LED small lamp; 3, parallel light lens; 31, TIR lens; 32, collimating lens; 4, light splitting lens; 41, toothed surface; 5, diffusion lens; 6, diffusion film. DETAILED DESCRIPTION
[0025] The following description will be made in conjunction with the accompanying drawings. Figures 1-3 The application is further described in detail.
[0026] The application discloses a PGU backlight architecture of a vehicle-mounted HUD.
[0027] Reference is made to Figure 1 A PGU backlight architecture of a vehicle-mounted HUD, which comprises PCB1, LED lamp group 2, parallel light lens 3, light splitting lens 4 and diffusion lens 5 arranged in sequence on the same axis.
[0028] The PCB1, i.e. printed circuit board, is electrically connected with the LED lamp group 2, drives the LED lamp group 2 to emit projection light of a given frequency and color, and forms a transmission image containing image information.
[0029] The parallel light lens 3 is located on one side of the PCB1, and when the projection image of the LED lamp group 2 is irradiated onto the parallel light lens 3, it can diffuse the light and form collimated parallel light, forming a visual image.
[0030] Then, the image light is projected onto the light splitting lens 4, which performs secondary distribution and diffusion of the light, so that the projection light is enlarged and diffused to the irradiation area of the image on the glass.
[0031] Reference is made to Figure 1 and Figure 2 Specifically, the cross section of the light splitting lens 4 is V-shaped, and the side close to the LED lamp group 2 is a plane with the same width as the PCB1. The included angle of the V-shaped structure of the light splitting lens 4 is greater than or equal to 90°, and the inner side edge of the light splitting lens 4 continuously distributes several toothed surfaces 41 with trapezoidal cross sections inward.
[0032] When the projection light passes through the light splitting lens 4, part of the light is emitted in the direction of the diffusion lens 5, and the other part of the light is deflected to the side, reflected, and the irradiation area of the expanded light is expanded. Because most of the incident light is greater than the critical angle of total reflection of the light splitting lens 4, the light is basically reflected vertically after reflection, and then all the collimated light is incident on the diffusion lens 5, which diffuses the light in the horizontal and vertical directions, achieving the purpose of precise light control.
[0033] After the image light is irradiated on the diffusion lens 5, the diffusion lens 5 can homogenize the light rays in the case of diffusing the light rays forwardly and forming the image with the size consistent with the size of the eyebox, so that the image projected on the automobile glass is clearer and the phenomenon of local spotlight is avoided.
[0034] Preferably, the diffusion lens 5 is further provided with a diffusion film 6 away from the side of the light splitting lens 4. The diffusion film 6 can further diffuse and homogenize the image light, reduce the problems of light spot and uneven brightness, and further optimize the display effect of the projected picture.
[0035] Preferably, the LED lamp group 2 includes a plurality of small-power LED small lamps 21, and the plurality of LED small lamps 21 are arranged in a single row or a double row. This design can reduce the energy consumption of the LED lamp group 2 while ensuring sufficient clarity of the projection, thereby saving the structural cost and use cost, and improving the actual applicability of the PGU backlight structure as a whole.
[0036] Referring to Figure 1 and Figure 3 , further, the parallel light lens 3 is one of a TIR lens 31 or a collimating lens 32. The TIR has strong far light projection performance, and can smoothly and accurately project the image light onto the front windshield of the automobile. The collimating lens 32 can provide a high-quality parallel light beam to ensure that the image projected on the glass is clearer, and avoid the problems of stray light interference and image blur.
[0037] Further, the diffusion lens 5 is one of a compound eye lens or a right-angle prism.
[0038] The compound eye lens can provide better astigmatism effect while changing the image light, so that the projected image picture is more soft and uniform, and long-time viewing is facilitated. The right-angle prism can completely change the direction of the image light, so that the projected picture is more complete, and the problems of picture loss or unclearness are avoided.
[0039] Referring to Figure 1 and Figure 3 , the inner side and the outer side of the light splitting lens 4 are both planar or curved surface structures, and the reference surface of the diffusion lens 5 is also a planar or curved surface structure.
[0040] When collimated light is needed, the inner side of the light splitting lens 4 can be a plane; when divergent light is to be formed, the inner side of the light splitting lens 4 can be a lens with different degrees of concave curvature to achieve the purpose of light with different divergence angles.
[0041] When collimated light needs to be compared, the outer side of the light splitting lens 4 can be a plane; when different angles and diffusion degrees need to be controlled, the outer side of the light splitting lens 4 can be a free-form surface, which can be controlled individually based on being divided into several curved surface pieces.
[0042] The implementation principle of the PGU backlight architecture of the vehicle-mounted HUD according to an embodiment of the present application is as follows:
[0043] Through the light splitting treatment of the light splitting lens 4 on the influence light and the joint action of the parallel light lens 3 and the diffusion lens 5, the influence light emitted from the inside of the LED lamp group 2 can be uniformly and clearly projected onto the automobile front windshield to form a picture, while the overall structure cost and energy consumption cost of the PGU backlight system are reduced, and the use value is high.
[0044] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A PGU backlight architecture for a vehicle head-up display, characterized by: The application relates to a light-emitting device, which comprises a PCB (1), an LED lamp group (2), a parallel light lens (3), a light distribution lens (4) and a diffusion lens (5) arranged in sequence and coaxially, The LED lamp group (2) is installed on the PCB (1) and used for emitting light and forming a projection image; The parallel light lens (3) is used for collimating the light rays of the image emitted by the LED; The light distribution lens (4) is used for secondarily distributing the collimated light rays and expanding the illumination area of the light rays; The diffusion lens (5) is used for diffusing the light rays and making the formed image more uniform, thereby improving the visual light effect; The light distribution lens (4) has a V-shaped structure in cross section, the side of the light distribution lens (4) close to the PCB (1) is a plane, the included angle of the V-shaped structure of the light distribution lens (4) is greater than or equal to 90 DEG, and the inner side edge of the light distribution lens (4) is continuously provided with a plurality of tooth-shaped surfaces (41) with trapezoidal cross sections, which are used for forming a reflection effect of the light rays.
2. The PGU backlight architecture for a vehicle-based HUD of claim 1, wherein: The diffusion lens (5) is further provided with a diffusion film (6) away from the side of the light distribution lens (4).
3. The PGU backlight architecture for a vehicle-based HUD of claim 2, wherein: The LED lamp group (2) comprises a plurality of small-power LED small lamps (21), and the plurality of LED small lamps (21) are arranged in a single row or a double row.
4. The PGU backlight architecture for a vehicle-based HUD of claim 3, wherein: The parallel light lens (3) is one of a TIR lens (31) or a collimating lens (32).
5. The PGU backlight architecture for a vehicle-based HUD of claim 4, wherein: The diffusion lens (5) is one of a compound eye lens or a right-angle prism.
6. The PGU backlight architecture for a vehicle-based HUD of claim 5, wherein: The inner side and the outer side of the light distribution lens (4) are planes or curved surfaces, and the reference surface of the diffusion lens (5) is a plane or a curved surface.