Display element, personal display device, method and use for displaying images on a personal display

A display element and display technology, applied in the field of diffraction display, to achieve the effect of increasing the maximum field of view, good shape and size, and small total light guide area

Active Publication Date: 2019-12-17
DISPELIX OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The overall dimensions of the light guide are 77 mm high by 52 mm wide, which is too large for a compact glasses-style NED

Method used

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  • Display element, personal display device, method and use for displaying images on a personal display
  • Display element, personal display device, method and use for displaying images on a personal display
  • Display element, personal display device, method and use for displaying images on a personal display

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Embodiment Construction

[0035] In the following, various embodiments of a lightguide-based diffractive near-eye display (NED) element are described, employing a bow-tie-shaped EPE as two grating regions arranged symmetrically around an in-coupling grating.

[0036] figure 2 A display element according to one embodiment is shown. The light guide 21 comprises a double period in-coupling grating 22 , two EPE gratings 23 , 24 and an out-coupling grating 25 . For comparison, figure 1 and figure 2 The outcoupling gratings 14, 25 in have identical physical dimensions. and figure 1 This embodiment exhibits an overall much smaller area EPE grating relative to the size of the outcoupling grating compared to the solution of . This makes the design of NED devices more compact. As can be seen, figure 2 The total light guide area required for the arrangement is much smaller.

[0037] The total footprint of the light guide may be eg 75 mm x 50 mm or smaller, eg 50-70 mm x 25-45 mm. for the above figure...

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PUM

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Abstract

The present invention relates to a display element for a personal display system, a personal display, and methods and uses. The display element comprises a light guide (21) capable of guiding light by total internal reflection, a diffractive in-coupling grating (22) and a diffractive out-coupling grating (25). The in-coupling grating is adapted to couple light directed thereto to the light guide to allow the light to propagate to the out-coupling grating. According to the invention, the incoupling grating is adapted to couple light into at least the light guide as at least two diffracted wavefronts, and the display element further comprises at least two different exit pupil expansion gratings (23, 24) adapted along the Different paths direct the wavefronts to the outcoupling gratings respectively. The invention allows reducing the size of diffractive display elements.

Description

technical field [0001] The invention relates to diffraction display technology. In particular, the invention relates to a lightguide based diffractive display comprising an incoupling grating, an exit pupil expansion grating and an outcoupling grating. In addition, the invention relates to a method of displaying an image on a diffractive display and a novel use. In particular, the present invention relates to personal displays, such as near-eye displays (NEDs) utilizing diffractive gratings. Background technique [0002] An additional grating, a so-called exit pupil expander (EPE), can be used between the in-coupling and out-coupling gratings of a diffractive light guide based display to expand the exit pupil of the display. Typically, the incoupling grating of a diffractive NED uses a single reflective or transmissive diffraction order, as described in US6580529B1, which is directed to the outcoupling grating through an exit pupil expander. In order to achieve high incou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G02B27/01G02B27/10G02B27/42G02B5/18
CPCG02B5/1842G02B2027/0123G02B27/1086G02B6/0016G02B6/0038G02B27/0081G02B27/0172G02B27/4272G02B5/1819G02B5/1866G02B6/0026G02B6/005
Inventor 尤索·奥肯宁安蒂·桑纳莉
Owner DISPELIX OY
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