exit pupil expander

一种出射光瞳、非衍射的技术，应用在衍射显示领域，能够解决EPE光栅损耗和干扰、降低图像亮度和均匀度、图像缺陷等问题

Active Publication Date: 2022-04-12
DISPELIX OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Like all optical gratings, EPE optical gratings generally cause loss and interference
This reduces the brightness and uniformity of the final image and causes image defects such as color imbalance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] When the light is propagated by EPE, a complex light path network is formed, wherein the energy is usually flow in two directions. Exemplary network figure 1 Indicated. The dot showing the position of the rays impact the grating surface from the diffraction of the incident light 11. The network structure allows energy to transmit a plurality of optical paths between points within the network. Two example paths are shown from the dashed lines of point A to Point B. During numerical optimization, energy transmission is performed by no need for all possible paths, by forming a blank area (gap) on the peripheral boundary of the EPE and the peripheral boundary of EPE, can enhance the operation of the EPE structure.

[0028] Figure 2A The insertion grating 22 guided by the light from the projector is shown, which is typically substantially perpendicular to the image plane in the figure. Light is diffracted and propagated in the waveguide to EPE 24 including the diffraction regio...

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PUM

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Abstract

An exit pupil expander (EPE) for a diffractive display is provided, the EPE comprising a plurality of diffractive regions on a waveguide and a plurality of non-diffractive regions between at least some of the diffractive regions.

Description

Technical field [0001] The present invention relates to diffractive display techniques. In particular, the present invention relates to light guided diffraction display elements including an emitter expander (EPE). Such display elements can be used in personal displays, such as head-mounted displays (HMDs), such as a neoplast (NED), and a flat display (HUD). Background technique [0002] HMD and HUD can be implemented using waveguide techniques. The light can be coupled to the waveguide using a diffraction grating, redirecting into the waveguide and coupled to the waveguide. In a conventional display design, light is directed from the projector to the coupling grating, and the incident light is diffracted into the waveguide. In the waveguide, the light is propagated by the full internal reflection via the EPE grating to propagate the grating, thereby Transversely expanding the visual area of ​​the display. EPE typically includes a grating, the grating line of the grating relative...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/01G02B27/00G02B27/42G02B5/18G02B6/00
CPCG02B6/00G02B27/0081G02B27/4272G02B27/0172G02B2027/0174G02B27/0101G02B5/1814G02B6/0016G02B6/0038G02B27/0103G02B27/42G02B6/124
Inventor 尤索·奥尔科宁彼得里·米奥哈宁
Owner DISPELIX OY
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