Vehicle-mounted HUD cold light curved mirror
Patent Information
- Application Number
- CN202521665162.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-06
- Publication Date
- 2026-08-18
- Estimated Expiration
- 2035-08-06
AI Technical Summary
TFT-LCD技术成熟、性价比高，但与采用铝制微镜阵列成像的DLP相比，采用不耐高温的液晶面板透射成像的TFT-LCD极易受到阳光倒灌的影响
[0017]1、可见光波段具有较高反射率而在红外波段具有较高的透射率，在保证成像清晰的同时减少汇聚到图像成像单元的太阳光的能量，有效减轻阳光倒灌带来的影响；
Smart Images
Figure CN224651668U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display device technology, and in particular to a vehicle-mounted HUD cold light curved reflector. Background Technology
[0002] Head-up display (HUD) is a display technology that projects important driving information directly into the driver's line of sight. Its application can significantly reduce the risk of traffic accidents caused by drivers frequently looking down to check driving information such as speed and navigation, thus improving driving safety.
[0003] Augmented Reality HUD (AR-HUD) uses a freeform optical system, which has a larger field of view and a greater imaging distance compared to the current mainstream windshield HUD (W-HUD). Combined with augmented reality technology, it integrates driving information projected on the windshield with real road conditions, resulting in a stronger sense of immersion.
[0004] The Picture Generation Unit (PGU) is one of the core components of a HUD. Currently, PGUs using TFT-LCD (Thin Film Transistor Liquid Crystal Display) and DLP (Digital Light Processing) projection technologies dominate the market. TFT-LCD technology is mature and cost-effective, but compared to DLP, which uses an aluminum micromirror array for imaging, TFT-LCD, which uses a heat-sensitive liquid crystal panel for transmission imaging, is extremely susceptible to the effects of sunlight backflow.
[0005] Sunlight backflow refers to the phenomenon in HUDs using TFT-LCD in the PGU that sunlight can enter along the backlight path of the imaging light and converge at the PGU through plane mirrors, curved mirrors, etc. The high temperature generated by the concentrated light can easily cause the LCD panel to overheat and burn out. The optical components such as plane mirrors and curved mirrors may also be affected by thermal stress deformation, which can affect the optical accuracy. Utility Model Content
[0006] The purpose of this invention is to provide a vehicle-mounted HUD cold light curved reflector that has high reflectivity in the visible light band and high transmittance in the infrared band.
[0007] Based on the above problems, the technical solution provided by this utility model is as follows:
[0008] A vehicle-mounted HUD cold light curved reflector includes:
[0009] A transparent substrate, which is curved;
[0010] A cold light film layer is disposed on the concave surface of the transparent substrate, comprising a base layer and a decorative layer arranged sequentially from the direction close to the transparent substrate to the direction away from the transparent substrate. The base layer comprises a plurality of alternating first high refractive index film layers and a plurality of low refractive index film layers. The decorative layer comprises a plurality of alternating second high refractive index film layers and a plurality of low refractive index film layers. The refractive index of the first high refractive index film layers is 3.2 to 3.9, the refractive index of the second high refractive index film layers is 2.2 to 2.5, and the refractive index of the low refractive index film layers is 1.46 to 1.49.
[0011] In some embodiments, the first high refractive index film layer is an SI layer, the second high refractive index film layer is an NB2O5 layer, and the low refractive index film layer is an SiO2 layer.
[0012] In some embodiments, the base layer comprises six film layers and the modification layer comprises nine film layers;
[0013] The concave surface of the transparent substrate is sequentially deposited with the following film layers: first SI layer, first SiO2 layer, second SI layer, second SiO2 layer, third SI layer, third SiO2 layer, first NB2O5 layer, fourth SiO2 layer, second NB2O5 layer, fifth SiO2 layer, third NB2O5 layer, sixth SiO2 layer, fourth NB2O5 layer, seventh SiO2 layer, and fifth NB2O5 layer.
[0014] In some embodiments, the thickness of the first SI layer is 20–30 nm, the thickness of the first SiO2 layer is 80–105 nm, the thickness of the second SI layer is 27–37 nm, the thickness of the second SiO2 layer is 105–135 nm, the thickness of the third SI layer is 27–40 nm, the thickness of the third SiO2 layer is 80–100 nm, the thickness of the first NB2O5 layer is 45–65 nm, the thickness of the fourth SiO2 layer is 75–95 nm, the thickness of the second NB2O5 layer is 25–40 nm, the thickness of the fifth SiO2 layer is 45–65 nm, the thickness of the third NB2O5 layer is 40–60 nm, the thickness of the sixth SiO2 layer is 60–80 nm, the thickness of the fourth NB2O5 layer is 25–38 nm, the thickness of the seventh SiO2 layer is 75–95 nm, and the thickness of the fifth NB2O5 layer is 10–18 nm.
[0015] In some of these embodiments, the transparent substrate is glass.
[0016] Compared with the prior art, the advantages of this utility model are:
[0017] 1. The visible light band has high reflectivity and the infrared band has high transmittance, which reduces the energy of sunlight that converges to the image unit while ensuring clear imaging, effectively mitigating the impact of sunlight backflow.
[0018] 2. Glass is used as the transparent substrate. Glass is not easily deformed by heat, and the curved reflector is more durable and will not affect the imaging accuracy of the vehicle HUD. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of a vehicle-mounted HUD cold light curved surface reflector according to the present invention;
[0021] Figure 2 In this embodiment of the invention, S-light is used as the light source, and the reflection curves of 400-1500nm are set with incident angles of 8, 15, and 30°.
[0022] Figure 3 In this embodiment of the invention, natural light is used as the light source, and the transmission curve of 400-1500 nm is set with an incident angle of 15°.
[0023] in:
[0024] 1. Transparent substrate; 2. First SI layer; 3. First SiO2 layer; 4. Second SI layer; 5. Second SiO2 layer; 6. Third SI layer; 7. Third SiO2 layer; 8. First NB2O5 layer; 9. Fourth SiO2 layer; 10. Second NB2O5 layer; 11. Fifth SiO2 layer; 12. Third NB2O5 layer; 13. Sixth SiO2 layer; 14. Fourth NB2O5 layer; 15. Seventh SiO2 layer; 16. Fifth NB2O5 layer. Detailed Implementation
[0025] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.
[0026] like Figure 1The diagram shown is a structural schematic of the present invention, which provides a vehicle-mounted HUD cold light curved reflector, including a transparent substrate 1 and a cold light film layer disposed on the transparent substrate 1.
[0027] The transparent substrate 1 is made of glass substrate, and the curved structure required for the curved reflector is formed by hot bending.
[0028] The cold light film layer is disposed on the concave surface of the transparent substrate 1 and includes a base layer and a decorative layer arranged sequentially from the direction close to the transparent substrate 1 to the direction away from the transparent substrate 1. The base layer includes a plurality of alternating first high refractive index film layers and a plurality of low refractive index film layers. The decorative layer includes a plurality of alternating second high refractive index film layers and a plurality of low refractive index film layers. The refractive index of the first high refractive index film layers is 3.2 to 3.9, the refractive index of the second high refractive index film layers is 2.2 to 2.5, and the refractive index of the low refractive index film layers is 146 to 149.
[0029] The first high-refractive-index film layer is the SI layer, the second high-refractive-index film layer is the NB2O5 layer, and the low-refractive-index film layer is the SiO2 layer.
[0030] Preferably, the base layer includes six film layers and the modification layer includes nine film layers; specifically, the film layers sequentially deposited on the concave surface of the transparent substrate are: first SI layer 2, first SiO2 layer 3, second SI layer 4, second SiO2 layer 5, third SI layer 6, third SiO2 layer 7, first NB2O5 layer 8, fourth SiO2 layer 9, second NB2O5 layer 10, fifth SiO2 layer 11, third NB2O5 layer 12, sixth SiO2 layer 13, fourth NB2O5 layer 14, seventh SiO2 layer 15, and fifth NB2O5 layer 16.
[0031] The thickness of the first SiO2 layer 2 is 20–30 nm, the thickness of the first SiO2 layer 3 is 80–105 nm, the thickness of the second SiO2 layer 4 is 27–37 nm, the thickness of the second SiO2 layer 5 is 105–135 nm, the thickness of the third SiO2 layer 6 is 27–40 nm, the thickness of the third SiO2 layer 7 is 80–100 nm, the thickness of the first NB2O5 layer 8 is 45–65 nm, and the thickness of the fourth SiO2 layer 9 is 75 nm. The thickness of the second NB2O5 layer 10 is 25-40 nm, the thickness of the fifth SiO2 layer 11 is 45-65 nm, the thickness of the third NB2O5 layer 12 is 40-60 nm, the thickness of the sixth SiO2 layer 13 is 60-80 nm, the thickness of the fourth NB2O5 layer 14 is 25-38 nm, the thickness of the seventh SiO2 layer 15 is 75-95 nm, and the thickness of the fifth NB2O5 layer 16 is 10-18 nm.
[0032] Example 1
[0033] A first Si layer with a thickness of 25.0 nm, a first SiO2 layer with a thickness of 94.3 nm, a second Si layer with a thickness of 34.1 nm, a second SiO2 layer with a thickness of 125.0 nm, a third Si layer with a thickness of 34.2 nm, a third SiO2 layer with a thickness of 92.7 nm, a first NB2O5 layer with a thickness of 55.6 nm, a fourth SiO2 layer with a thickness of 87.1 nm, a second NB2O5 layer with a thickness of 35.3 nm, a fifth SiO2 layer with a thickness of 54.9 nm, a third NB2O5 layer with a thickness of 50.0 nm, a sixth SiO2 layer with a thickness of 73.4 nm, a fourth NB2O5 layer with a thickness of 32.1 nm, a seventh SiO2 layer with a thickness of 86.7 nm, and a fifth NB2O5 layer with a thickness of 14.2 nm are sequentially deposited on the concave surface of a curved glass substrate formed by hot bending using magnetron sputtering.
[0034] Example 2
[0035] A first Si layer with a thickness of 22.5 nm, a first SiO2 layer with a thickness of 86.6 nm, a second Si layer with a thickness of 30.6 nm, a second SiO2 layer with a thickness of 112.5 nm, a third Si layer with a thickness of 30.6 nm, a third SiO2 layer with a thickness of 83.7 nm, a first NB2O5 layer with a thickness of 49.5 nm, a fourth SiO2 layer with a thickness of 80.4 nm, a second NB2O5 layer with a thickness of 32.0 nm, a fifth SiO2 layer with a thickness of 50.9 nm, a third NB2O5 layer with a thickness of 45.1 nm, a sixth SiO2 layer with a thickness of 65.7 nm, a fourth NB2O5 layer with a thickness of 28.8 nm, a seventh SiO2 layer with a thickness of 78.3 nm, and a fifth NB2O5 layer with a thickness of 13.0 nm were sequentially deposited on the concave surface of a curved glass substrate formed by hot bending using magnetron sputtering.
[0036] Example 3
[0037] A first Si layer with a thickness of 26.5 nm, a first SiO2 layer with a thickness of 96.7 nm, a second Si layer with a thickness of 35.7 nm, a second SiO2 layer with a thickness of 130.2 nm, a third Si layer with a thickness of 34.7 nm, a third SiO2 layer with a thickness of 95.6 nm, a first NB2O5 layer with a thickness of 57.7 nm, a fourth SiO2 layer with a thickness of 91.3 nm, a second NB2O5 layer with a thickness of 36.7 nm, a fifth SiO2 layer with a thickness of 56.3 nm, a third NB2O5 layer with a thickness of 52.5 nm, a sixth SiO2 layer with a thickness of 76.6 nm, a fourth NB2O5 layer with a thickness of 33.6 nm, a seventh SiO2 layer with a thickness of 88.3 nm, and a fifth NB2O5 layer with a thickness of 14.7 nm were sequentially deposited on the concave surface of a curved glass substrate formed by hot bending using magnetron sputtering.
[0038] TFT-LCDs utilize liquid crystal display panels for imaging, and the imaging light is polarized light. The reflectivity of its S-polarized and P-polarized components varies with the angle of incidence. The angle of incidence of the imaging light onto the windshield is approximately 55–65°. At this angle, the reflectivity of S-polarized light is much greater than that of P-polarized light. Therefore, TFT-LCDs generally use S-polarized light, and S-polarized light should be used as the light source when evaluating the visible light reflectivity of curved mirrors. The incident angle range for curved mirrors is 0–30°. The change in the reflection spectrum with the incident angle is continuous and does not exhibit abrupt changes; therefore, key values are selected for reflection or transmission testing.
[0039] Using S-light as the light source, the average reflectivity of the vehicle-mounted HUD cold light curved reflector prepared in the above embodiment was measured in the visible light (400-650nm) band, with incident angles of 8, 15, and 30° respectively. The reflection curves are shown below. Figure 2 As shown; using natural light as the light source, with an incident angle of 15°, the average transmittance in the infrared band (750–1500 nm) was measured, and the transmittance curve is shown below. Figure 3 As shown in Table 1.
[0040] Table 1 Optical data of the embodiments
[0041]
[0042] The samples in the above embodiments underwent high temperature and high humidity tests for a total of 1000 hours at 85°C and 85% humidity, thermal shock tests for a total of 600 cycles at -40°C for 30 minutes and 95°C for 30 minutes each, and sunlight simulation tests in accordance with DIN75220 standard. No film delamination was observed after the cross-cut adhesion test, indicating good film adhesion.
[0043] The ability of the example sample to divert solar energy was evaluated using an instrument for measuring solar shading rate. The solar source was positioned 2 meters from the detector, and the instrument was adjusted so that the irradiance measurement data was 100 mW / cm². 2 Uncoated glass, an aluminized curved mirror, and the sample from Example 1 were placed in front of the detector, and the measured irradiance was 89.2 mW / cm², respectively. 2 0mW / cm 2 31.1mW / cm 2 At an incident angle of 8°, the average reflectance of the conventional aluminized curved reflector in the visible light band is approximately 92%, which is close to that of the cold-light curved reflector in the embodiment, resulting in similar imaging effects. However, compared to the conventional aluminized curved reflector, approximately 31.1% of the solar energy can pass through the cold-light curved reflector without being absorbed by the curved reflector and PGU, effectively mitigating the impact of sunlight backflow.
[0044] The above examples are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A vehicle-mounted HUD cold light curved surface reflector, characterized in that, include: A transparent substrate, which is curved; A cold light film layer is disposed on the concave surface of the transparent substrate, comprising a base layer and a decorative layer arranged sequentially from the direction close to the transparent substrate to the direction away from the transparent substrate. The base layer comprises a plurality of alternating first high refractive index film layers and a plurality of low refractive index film layers. The decorative layer comprises a plurality of alternating second high refractive index film layers and a plurality of low refractive index film layers. The refractive index of the first high refractive index film layers is 3.2 to 3.9, the refractive index of the second high refractive index film layers is 2.2 to 2.5, and the refractive index of the low refractive index film layers is 1.46 to 1.
49.
2. The vehicle-mounted HUD cold light curved reflector according to claim 1, characterized in that: The first high refractive index film layer is an SI layer, the second high refractive index film layer is an NB2O5 layer, and the low refractive index film layer is an SiO2 layer.
3. The vehicle-mounted HUD cold light curved reflector according to claim 2, characterized in that: The base layer comprises six film layers, and the modification layer comprises nine film layers; The concave surface of the transparent substrate is sequentially deposited with the following film layers: first SI layer, first SiO2 layer, second SI layer, second SiO2 layer, third SI layer, third SiO2 layer, first NB2O5 layer, fourth SiO2 layer, second NB2O5 layer, fifth SiO2 layer, third NB2O5 layer, sixth SiO2 layer, fourth NB2O5 layer, seventh SiO2 layer, and fifth NB2O5 layer.
4. The vehicle-mounted HUD cold light curved reflector according to claim 3, characterized in that: The thickness of the first Si layer is 20–30 nm, the thickness of the first SiO2 layer is 80–105 nm, the thickness of the second Si layer is 27–37 nm, the thickness of the second SiO2 layer is 105–135 nm, the thickness of the third Si layer is 27–40 nm, the thickness of the third SiO2 layer is 80–100 nm, the thickness of the first NB2O5 layer is 45–65 nm, the thickness of the fourth SiO2 layer is 75–95 nm, the thickness of the second NB2O5 layer is 25–40 nm, the thickness of the fifth SiO2 layer is 45–65 nm, the thickness of the third NB2O5 layer is 40–60 nm, the thickness of the sixth SiO2 layer is 60–80 nm, the thickness of the fourth NB2O5 layer is 25–38 nm, the thickness of the seventh SiO2 layer is 75–95 nm, and the thickness of the fifth NB2O5 layer is 10–18 nm.
5. The vehicle-mounted HUD cold light curved reflector according to claim 1, characterized in that: The transparent substrate is glass.