Projection devices, head-up display devices, and vehicle-mounted visual assistance systems

Abstract

The present invention provides a projection device, a head-up display device, and a vehicle-mounted visual aid system. The projection device includes a spatial light modulation unit, a Fourier lens, a first display unit and a second display unit arranged in sequence along the beam propagation direction, Wherein, the spatial light modulation unit includes a first modulation module and a second modulation module, the first modulation module is used to load the first kinoform, so that the outgoing light beam reproduces a two-dimensional holographic image after passing through the Fourier lens; the second The modulation module is used to load a plurality of different second kinoforms one by one at a preset frequency, so that the outgoing beam reproduces a three-dimensional holographic image after passing through a Fourier lens; the two-dimensional holographic image and the three-dimensional holographic image are separated from each other; the first The presentation unit and the second presentation unit are respectively used for presenting a two-dimensional hologram and a three-dimensional hologram. The projection device provided by the present invention can realize three-dimensional display, and can simplify the structure of the device, thereby reducing the manufacturing cost.

Description

technical field [0001] The present invention relates to the field of projection technology, in particular to a projection device, a head-up display device and a vehicle-mounted visual aid system. Background technique [0002] The on-vehicle visual assistance system can display real-time status information such as vehicle speed and fuel consumption, as well as indication information such as navigation and danger warnings, in a suitable position in front of the driver's line of sight by means of projection. When the driver needs to obtain such information, his sight It can not deviate from the road ahead, thereby avoiding the visual blind spot caused by looking down at the instrument panel or central control equipment, and ensuring driving safety. [0003] The current on-board visual assistance system can only realize two-dimensional display, and the information displayed in two-dimensional display often takes a short time for the driver to understand and then make a correspon...

AI Technical Summary

Problems solved by technology

[0003] The current on-board visual assistance system can only realize two-dimensional display, and the information displayed in two-dimensional display often takes a short time for the driver to understand and then make a corresponding judgment. When various dangers occur, it is not conducive to the driver Make timely judgments on sudden critical moments during driving

[0004] Moreover, for the current vehicle-mounted visual aid system with multiple projection surfaces, although it can project different information on different positions away from the driver's line of sight, it needs to configure multiple groups of mirrors with complex structures, and the manufacturing cost is relatively high. high

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