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Dithered holographic frontlight

A technology of hologram and holographic recording material, applied in the directions of optics, light guides, optical elements, etc.

Inactive Publication Date: 2012-02-22
IDC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, uniformly illuminating displays without artifacts has proven challenging

Method used

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  • Dithered holographic frontlight
  • Dithered holographic frontlight
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Embodiment Construction

[0036] While the invention will be described with reference to several specific embodiments, the description and specific examples are only illustrative of the invention and should not be construed as limiting the invention. Various modifications may be made to the described embodiments without departing from the true spirit and scope of the invention as defined in the appended claims. For example, the steps of the methods shown and described herein do not have to be performed in the order indicated. It should also be understood that the methods of the invention may include more or fewer steps than indicated. In some embodiments, steps described herein may be combined as separate steps. Conversely, what may be described herein as a single step may be performed in multiple steps.

[0037] Similarly, device functionality may be assigned by grouping or dividing tasks in any convenient manner. For example, when steps are described herein as being performed by a single device (e...

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Abstract

A reflective or transmissive hologram may be used to extract light from a waveguide. The hologram may be formed by separately exposing each of a plurality of areas of a holographic medium with object beams and / or reference beams having attributes (e.g., illumination angles) that vary randomly or pseudorandomly over the entire hologram. The areas may be contiguous (e.g., in a tiled pattern) or overlapping. In some embodiments, the spacing and / or orientation of the diffraction gratings may vary from area to area. For example, the spacing and / or orientation of the diffraction gratings may vary randomly or pseudorandomly from area to area. Some parts of the hologram may intentionally be made relatively more or relatively less efficient at extracting light from the waveguide.

Description

[0001] Related Application Cross Reference [0002] This application claims priority to U.S. Patent Application Serial No. 12 / 409,289, entitled "Dithered Holographic Frontlight," filed March 23, 2009, which It is hereby incorporated by reference in its entirety for all purposes. technical field [0003] This application relates generally to display technology and, more particularly, to illumination of displays. Background technique [0004] Various devices exist for display illumination. Some "front-lit" display illumination devices provide light to a waveguide and extract light from the plane of the waveguide to illuminate the display substantially parallel to the waveguide. Various light extraction elements can be used to extract light from the plane of the waveguide, such as prismatic films, holograms, etc. However, uniformly illuminating displays without artifacts has proven challenging. Accordingly, it would be desirable to provide improved front lighting devices. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/22G02B5/32G02B6/00
CPCG02B5/32G02B6/0035G02B6/0065G03H1/00G03H1/04G03H1/0408G03H1/26G03H2001/0439G03H2001/0482G02B6/00G03H1/22
Inventor 杰弗里·布莱恩·桑普塞尔马雷克·米恩克
Owner IDC LLC