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Diffractive waveguide element and diffractive waveguide display

A technology of diffractive optical elements and diffractive waves, which is applied in the field of diffractive waveguides, can solve problems such as being invisible to users, achieve the effect of increasing rebound density and improving performance

Active Publication Date: 2020-08-04
DISPELIX OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this case the pixels may be diffracted to the pupil and thus not visible to the user

Method used

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  • Diffractive waveguide element and diffractive waveguide display
  • Diffractive waveguide element and diffractive waveguide display
  • Diffractive waveguide element and diffractive waveguide display

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[0025] definition

[0026] Diffractive optical elements herein refer to gratings and other optical structures comprising regular or irregular features having at least one dimension on the order of the wavelength of visible light, ie typically less than 1 μm, and thus causing significant diffraction of light. Examples include line gratings (one-dimensional gratings) and two-dimensional gratings. The grating can be a single-zone grating (having the same microstructure and optical response over the entire grating area) or a multi-zone grating (ie containing zones with different microstructure and optical response).

[0027] The "jump length" is the length of two consecutive lengths of light propagating in a waveguide via total internal reflection on the same surface of the waveguide. The distance between the bounce points.

[0028] Description of selected implementations

[0029] For example, when augmented reality (AR) waveguides are illuminated by laser light, the bea...

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Abstract

The invention relates to a diffractive waveguide element for a personal display device, the element comprising a display waveguide (10) extending in a waveguide plane, an in-coupling diffractive optical element (31 ) arranged onto or into the display waveguide (10) for diffractively coupling light rays into the display waveguide (10), and an out-coupling diffractive optical element (33) arranged onto or into the display waveguide (10) for coupling the diffractively coupled light rays out of the display waveguide (10). In addition, there is provided a ray multiplier element (12A) optically upstream of the out-coupling diffractive optical element (33), the ray multiplier element (12A) being capable of splitting a light ray incoming to the in-coupling grating (31) into a plurality of parallelrays spatially displaced in the waveguide plane before they enter the out-coupling diffractive optical element (33). The invention additionally relates to waveguide display device.

Description

technical field [0001] The present invention relates to diffractive waveguides. Such waveguides can be used in personal display devices, such as head-mounted displays (HMD) and head-up displays (HUD). Background technique [0002] Waveguides are key image-forming elements in many modern personal display devices. Diffractive gratings can be used to couple the image to be displayed into and out of the waveguide, as well as to modify the image to be displayed within the waveguide. For example, it is possible to provide: an in-coupling grating for coupling the image from the projector into the waveguide; an exit pupil expander grating for expanding the square into one or more in-plane dimensions of the waveguide; and an out-coupling grating , which couples the image of the waveguide to the user's eye. [0003] One problem associated with diffractive waveguide elements is banding of the image coupled out of them. This is because a light beam traveling via total internal refle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/01G02B5/18G02B27/42G02B6/00G02B27/10
CPCG02B27/0081G02B27/4272G02B27/0172G02B27/0101G02B6/0016G02B6/0043G02B6/0028G02B27/01G02B27/00G02B27/017G02B5/00G02B6/00G02B5/1814G02B27/0103G02B6/10G02B5/1828
Inventor 卡西米尔·布卢姆斯泰特尤索·奥尔科宁安蒂·松纳里
Owner DISPELIX OY