HUD optical path system that can be used with polarized sunglasses and eliminates ghosting

Abstract

The invention relates to the technical field of HUD, and specifically discloses an HUD optical path system that can be used with polarized sunglasses and eliminates ghosting. The HUD optical path system includes a light source module and a reflection module, wherein the light source module emits P polarized light; and the reflection module includes a reflector module arranged in the HUD and an automobile windshield which can reflect P light and transmit S light. The HUD optical path system that can be used with polarized sunglasses and eliminates ghosting has the advantages of adopting the automobile windshield with a three-layer structure including at least glass inner surface, P light reflection layer and glass outer surface, thus being able to reflect P light and transmit S light whilethe P light emitted from HUD is not filtered when a driver wears the sunglasses and the image does not become darker, so that observation of the image is not influenced, and having no demand for the inner and outer surface angles of the windshield, so that the windshield can be parallel glass, and the manufacturing difficulty is reduced and the cost is lower. Besides, the windshield reflecting theP light coordinates with the HUD emitting the P light, so that ghosting does not occurs during image projection, and the requirement for the optical path and structural design inside the HUD is lower.

Description

technical field [0001] The invention relates to the technical field of HUD, in particular to a HUD optical path system which can be used with polarized sunglasses and eliminate ghost images. Background technique [0002] When light enters the glass from the air, refraction (transmission) and reflection will occur on the glass surface. The ratio of refracted light to reflected light is related to the incident angle. figure 1 The relationship curve between light intensity reflectance and incident angle shows that: the larger the incident angle, the more reflected light, and the ratio of P light and S light in the reflected light is changing, as figure 2 As shown, when the incident angle reaches Brewster's angle i 0 When , the reflected light is basically S light, and all P light is transmitted. As the incident angle further increases, the proportion of reflected light will further increase, but the reflection proportion of S light will increase faster. [0003] In the actua...

AI Technical Summary

Problems solved by technology

[0005] Ordinary windshield works with HUD, the reflected light of windshield is S light, and S light is filtered when the driver wears sunglasses, which affects the driver's observation image

Ordinary windshield glass adopts ordinary PVB, the inner and outer surfaces of the glass are parallel, and the main image is separated from the secondary image, which is easy to cause ghosting, such as Figure 4

To solve the problem of ghosting, the windshield glass can use wedge-shaped PVB, the thickness of the top glass is greater than the thickness of the bottom glass, and the main image and the secondary image overlap, such as Figure 5 , but the wedge glass processing is limited by the process, the production cost is high, and the wedge angle will restrict the HUD design, making the design more difficult

[0006] The wedge-shaped glass can only eliminate ghosting at a certain angle, but cannot completely eliminate the projection in the entire projection area, and the wedge-shaped glass will impose requirements on the projection distance of the HUD, making the design more difficult

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