Diffusion angle measurement device and measurement method

Abstract

The invention provides a diffusion angle measurement device and measurement method. The device and the method are used for measuring the diffusion angle of a diffusion module. The device comprises a light source module, a projection module, an acquisition module and a measurement and calculation module. The light source module outputs collimating beams to a diffusion module so as to allow the diffusion module to diffuse the collimating beams. The projection module projects the diffused beams passing through the diffusion module. The acquisition module acquires projection images on the acquisition module. The measurement and calculation module determines diffusion angles of the diffusion beams according to the distance between the projection images, the projection module and the diffusion module. According to the invention, the diffusion angles of the diffusion module can be measured in advance, so the diffusion angles are allowed to meet the window parameter requirements and optical energy loss is reduced.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to a diffusion angle measuring device and a measuring method. Background technique [0002] Head-up display (Head-up Display, HUD for short) is a vehicle-mounted visual assistance system. The head-up display projects and displays vehicle status information such as vehicle speed and fuel level, as well as auxiliary indication information such as navigation and danger warnings, on a suitable position in front of the driver. This ensures that the driver's line of sight does not deviate from the road ahead, eliminates the visual blind spot caused by looking down at the instrument panel, and increases driving safety. [0003] Eyebox is an important parameter of HUD. The typical size of Eyebox is 140 mm horizontally and 60 mm vertically, so as to ensure that the driver can still see all the HUD display information when his head moves within a certain range. In order to ensure tha...

AI Technical Summary

Problems solved by technology

For HUD systems that use display technologies such as DLP, laser MEMS scanning, or laser phase holography as display units, the light diffusion angle emitted by the diffusion module is very critical. If the diffusion angle is large, it will lead to low light energy utilization, high power consumption, and High heat generation, if the diffusion angle is small, the size of the Eyebox will be small, which cannot meet the actual needs

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