Anti-ghosting head-up display device

Abstract

The invention belongs to the technical field of head-up display and provides a double-image-eliminating head-up display device. The double-image-eliminating head-up display device is installed in an automobile and comprises a projection device projecting an image onto a front windshield of the automobile. A phase modulation sheet capable of converting incident light into linearly polarized light is arranged in the projection device. The double-image-eliminating head-up display device further comprises a polarizing film arranged inside the front windshield. The transmission direction of the polarizing film is perpendicular to the polarization direction of the main wavelength of the linearly polarized light emitted through the front surface of the front windshield. According to the double-image-eliminating head-up display device, the phase modulation sheet is arranged in the projection device and the polarizing film is embedded into the front windshield, so that the transmission direction of the polarizing film is perpendicular to the polarization direction of the main wavelength of the linearly polarized light emitted into the front windshield, the light emitted into the front windshield is prevented from being reflected to the human eyes by the rear surface of the front windshield, and therefore double images are eliminated. The double-image-eliminating head-up display device is good in double-image-eliminating effect, simple in structure, free of limit to the range of visibility, convenient to use and free of influence on beauty.

Description

technical field [0001] The invention relates to the technical field of head-up display, in particular to a head-up display device capable of eliminating ghost images. Background technique [0002] When using a head-up display (HUD), images are reflected off both the inner and outer surfaces of a typical windshield, and the driver sees two or more images. Such as figure 1 , the light L0 emitted by the light source A is reflected on the glass front surface 1, and the reflected light L1 is incident on the eyes, and the eyes regard the point A1 on the reverse extension line of the light L1 as the image of the light source A, and at the same time, the light L0 emitted by the light source A Part of it will enter the glass and be reflected on the back surface of the glass. The reflected light L2 will be transmitted through the front surface and enter the eyes. The human eye will take the point A2 on the reverse extension line of the light L2 as the image of the light source A. The...

AI Technical Summary

Problems solved by technology

This system has limitations when used in vehicle head-up devices:

[0008] None of the above solutions can solve the ghosting problem of the head-up display system well, so it is necessary to propose a new type of head-up display device that can eliminate ghosting and has a simple structure

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