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Diffractive combiner for a color head-up display (hud) device

A head-up display and combiner technology, applied in the field of diffraction combiner, to achieve the effect of overcoming compatibility, reducing complexity, and controlling diffraction efficiency

Active Publication Date: 2013-02-27
DELPHI TECH INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such adaptation would thus introduce greater complexity
Also, in the literature cited above, the control of the diffraction efficiency is empirical and very limited, implying the problem of normalizing the brightness level for the obtained virtual image

Method used

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  • Diffractive combiner for a color head-up display (hud) device
  • Diffractive combiner for a color head-up display (hud) device
  • Diffractive combiner for a color head-up display (hud) device

Examples

Experimental program
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Embodiment Construction

[0051] figure 1 A portion of a diffractive combiner 10 for a "full-colour" head-up display device is schematically shown. The combiner 10 comprises a support 12 made of a plastic material such as PMMA, PC, PET or PVB. The combiner 10 includes first 14 and second 16 optical diffraction gratings formed in relief on the first and second faces of the support 12, respectively. let's pay attention to figure 1 In , the dimensions of the combiner 10 are not to scale; in particular, the thickness of the support 12 and the amplitude (or depth) of the relief are exaggerated. The thickness of the combiner is preferably in the range of 0.25 to 3 mm. The depth of the relief grating is preferably in the range from 100 to 600 nm.

[0052] The first optical diffraction grating 14 is a multiplexing grating, while the second 16 is a single (non-multiplexing) grating.

[0053] To explain the configuration of the optical diffraction gratings 14, 16 and the operation of the diffraction combine...

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Abstract

The invention relates to a diffractive combiner (10) for a color head-up display (HUD) device (18), wherein said diffractive combiner includes a first optical diffraction grating (14) adapted for diffracting, in a diffraction direction, light having a first wavelength and which is incident on the first grating in an incidence direction, a second optical diffraction grating (16) adapted for diffracting, in the same direction, light having a second wavelength and which is incident on the second grating in the incidence direction. The first and second optical diffraction gratings are formed in relief on first and second opposite surfaces of the combiner. The first and / or second grating is made as a wavelength multiplex optical diffraction grating and is adapted for diffracting in the diffraction direction light at a third wavelength impacting the first and / or second optical diffraction grating in the incidence direction.

Description

technical field [0001] The invention relates to a head-up display device, in particular for automobiles. In particular, the invention relates to a diffractive combiner for such devices, in particular for the display of color information. Background technique [0002] Head-up display devices generally comprise a projection unit which generates a light beam intended to be directed at the combiner for the projection of images, in particular operating or driving information of the vehicle in the form of a virtual image located in the driver's field of view. Such equipment was originally manufactured based on technologies derived from aeronautical applications. Their production costs are therefore often high, preventing their commercial development and their large-scale installation in low- or mid-range vehicles. [0003] These costs arise in particular from the technology used, which is complex to implement and, moreover, does not always allow mass replication of the combiner ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/32G02B27/01
CPCG02B27/1086G02B5/32G02B27/0103G03H2001/266G03H1/0244G02B5/18
Inventor H.穆萨I.埃尔阿菲迪
Owner DELPHI TECH INC