Optical module for head-up display, optical system thereof and vehicle

Abstract

The invention provides an optical module for head-up display, an optical system thereof and a vehicle, and relates to the technical field of head-up display. The system comprises an image generation element and a light blocking assembly which are arranged in sequence, the image generation element is used for forming an image signal, and the image signal enters a receiving end through the light blocking assembly; the light blocking assembly is further used for enabling part of external light to penetrate through according to the polarization direction and / or the wavelength. When passing through the light blocking assembly, an image signal is not influenced by or hardly blocked by the light blocking assembly, external light sequentially passes through the light blocking assembly and the image generation element, the external light does not generate an image after passing through the image generation element, but light heat of the external light can be gathered on the image generation element, the temperature of the image generation element is increased, and the image generation effect is improved. The light blocking assembly is adopted to filter most of the external light, so that a small part of the external light passes, the light heat of the external light on the image generation element is reduced, the temperature of the image generation element is reduced, and the image quality is ensured.

Description

technical field [0001] The present application relates to the technical field of head-up display, in particular to an optical module for head-up display, its optical system, and a vehicle. Background technique [0002] With the development of technology, the application of head-up display technology (HUD) to the automotive field is becoming more and more common. In recent years, augmented reality head-up display (AR HUD) has also begun to be applied to some high-end cars. Because AR HUD can have a larger field of view and a farther virtual image distance, it can blend the displayed image with the real object, so it is more popular among users. [0003] However, due to the larger area of ​​AR HUD optical components, the energy of external sunlight entering the optical system will be more; in addition, due to the longer distance of the virtual image, the position of the image generation unit is closer to the focus of the optical imaging system than ordinary HUD . Therefore, ...

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Problems solved by technology

[0003] However, due to the larger area of ​​AR HUD optical components, the energy of external sunlight entering the optical system will be more; in addition, due to the longer distance of the virtual image, the position of the image generation unit is closer to the focus of the optical imaging system than ordinary HUD

Therefore, when sunlight backflow occurs, the sunlight energy will be more concentrated on the image generation unit; correspondingly, the temperature of the illuminated area of ​​the image generation unit is very high at this time. Exceeding the working temperature of the general image generation unit (generally 105°C), it will affect the imaging quality, and in severe cases, the image generation unit may be damaged due to overheating, affecting its working performance

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