Vehicle-mounted head-up display projection collimation relay optics system based on holographic optical element

Abstract

The invention provides a collimation projection relay optics system design method based on a holographic optical element. The method is mainly applied in a vehicle-mounted head-up display (HUD). In the system, a transmission-type holographic optical element assembly is used and the system is designed to be an inverted infinity imaging system. An image generated by an image source is changed into parallel light which is projected and enters into an optical combination display portion, and most of aberrations generated at a position of combination glass can be compensated. The aberrations and distortions of the whole set of the system are less. The system possesses a large off-axis angle and a field angle so that an imaging quality can be obviously improved. Because the holographic optical element is used to replace a traditional refractive optical element, the size of the whole set of system is small; weight is light; batch production cost is low; the structure is simple; assembling and adjusting difficulties are low; the system is easy to be installed in a small space.

Description

technical field [0001] The invention relates to a collimating projection relay optical system based on a holographic optical element applied in a head-up display. Background technique [0002] A head-up display (HUD) is a driving assistance device applied to a car. It uses the optical reflection principle of holographic grating to project important driving information onto the holographic grating combined with the front windshield of the car. The projected text and images are imaged at infinity directly in front of the driver. When the driver looks forward through the HUD, he can directly see the data displayed on the HUD overlapping with the outside world. It reduces the frequency of the driver looking down at the instrument, avoids the interruption of attention and visual delay and discomfort caused by the constant adjustment of the eye focus between the head down and the head up, reduces driving fatigue, and improves driving safety. [0003] HUD is mainly composed of th...

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Problems solved by technology

[0004] Common refraction and reflection optical elements are mostly used in the traditional collimation projection optical system, and the optical system formed from this mainly has the following disadvantages: (1) The optical design of the system is complex, and the optical elements require high processing precision, which is difficult to process; (2) The size and weight of ordinary optical components are relatively large. When this collimated projection relay optical system is installed in a small space such as a car or a cabin, it is easy to block the light entering the human eye and reduce the driver's head. range of activities

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