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Shadow elimination in the backlight for a 3-d display

A technology of light guide and light source, which is applied in the field of shadow elimination in the backlight of 3D displays, and can solve problems such as difficult uniform illumination

Active Publication Date: 2013-01-23
MICROSOFT TECH LICENSING LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to provide uniform illumination for such light guides

Method used

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  • Shadow elimination in the backlight for a 3-d display
  • Shadow elimination in the backlight for a 3-d display
  • Shadow elimination in the backlight for a 3-d display

Examples

Experimental program
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Embodiment Construction

[0033] As mentioned in the opening paragraph, light guides are commonly used in applications such as backlighting for LCDs and for providing projection displays. In a comparable embodiment, the backlight receives unpolarized light at the input and the geometry of the light guide is such that this light is emitted in a collimated manner, which is still unpolarized.

[0034] In the development presented here, the light input to the light guide is polarized, and a polarization switching material is used in the light guide to cause the light to be emitted from the face of the light guide in a collimated manner. The advantage of this approach is that less power is required to make an image on an LCD placed in front of the backlight visible to the user compared to a light guide that emits light in all directions. In addition, users have privacy since the display cannot be seen by anyone but them. Additionally, collimation directions can be scanned so that illumination can be contin...

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PUM

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Abstract

A light guide device can provide a backlight for an LCD or a projection display. The light guide device includes a light-input end and an opposing end, opposing left and right sides which join the light-input end and the opposing end, and opposing front and back surfaces which join the light- input end and the opposing end. A birefringent film is provided on the opposing left and right sides of the light guide which switches a polarization of incident light. Incident light is provided at the light-input end having a right-handed circular polarization, in addition to light having a left-handed circular polarization. Light emitted from the front surface passes through a linear polarizer which selectively passes light to allow privacy of viewing by a user. The incident light can be provided at the light- input end using one or more cuboid rods, slab light guides, or discrete light sources.

Description

Background technique [0001] Light guides can be used to transmit light for illumination. Examples include computer monitors, televisions, instrument panels, aircraft or marine vehicle cockpit displays, signage, and devices such as video players, gaming devices, clocks, watches, calculators, still image cameras, video cameras, mobile / cellular In many applications of telephones and other telephonic consumer devices, light guides can be used as backlights for liquid crystal displays (LCDs), for example. Furthermore, the scanning backlight is a thin backlight that emits collimated rays whose collimated direction can be scanned. Light guides may also be used to provide projection displays, such as in head-mounted displays as they are used in a variety of applications, including military, aviation, medical, video games, entertainment, sports, and the like. See-through head-mounted displays allow a user to observe the physical world around him or her, while optics add light to the ...

Claims

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Application Information

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IPC IPC(8): G02B27/22F21V8/00G02F1/13357G02B27/26H04N13/04G02B30/25
CPCG02B27/286G02B6/0056G02B27/26G02B30/25
Inventor A.特拉维斯N.埃默顿T.拉奇
Owner MICROSOFT TECH LICENSING LLC