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Method and system for beam expansion in a display device

Inactive Publication Date: 2006-06-15
NOKIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] It is an objective of the present invention to improve the optical coupling between two optical elements such as diffractive optical elements in an exit pupil extender. This objective can be achieved by using a diffractive optical element having the grating lines are orie

Problems solved by technology

Thus, such a display no longer qualifies as an NED, for obvious reasons.

Method used

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  • Method and system for beam expansion in a display device
  • Method and system for beam expansion in a display device
  • Method and system for beam expansion in a display device

Examples

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Embodiment Construction

[0059] In the exit pupil extender (EPE) 10, according to the present invention, has a substrate 20 made of an optical material. On the substrate 20, there are one input optical element 30 and one or two exit optical elements 50, as shown in FIG. 2. The EPE 10 also has one or two intermediate optical couplers 40, 40′ each disposed between the input optical element 30 and one of the exit optical elements 50, 50′. The couplers 40,40′ serve as exit pupil extending components. The optical elements 30, 50, 50′ and the couplers 40, 40′ are diffractive optical elements (DOEs), for example. Each of the DOEs has a plurality of grating lines for diffraction purposes. As shown, the optical element 30 has a plurality of grating lines 32; the optical element 40 (40′) has a plurality of grating lines 42 and the optical element 50 (50′) has a plurality of grating lines 52.

[0060]FIG. 3 is an isometric view showing the relationship between an input beam 70 and two exit beams 80, 80′. As shown, the s...

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Abstract

An exit pupil extender with one input optical element and two exit optical elements disposed on different sides of the input optical element. The exit pupil extender also comprises two intermediate optical couplers, each disposed between the input optical element and one exit optical element. The couplers serve as exit pupil extending components. All optical elements and couplers are diffractive optical elements having grating lines. The grating lines of one optical element are substantially parallel to that of other optical elements, but the grating lines of the couplers are at substantially a 60-degree angle from that of the optical elements in order to optimize the exit pupil extending efficiency.

Description

FIELD OF THE INVENTION [0001] The present invention relates generally to a display device and, more specifically, to a display that uses two or more diffractive elements for extending the exit pupil of the display for viewing. BACKGROUND OF THE INVENTION [0002] While it is a common practice to use a low-resolution liquid-crystal display (LCD) panel to display network information and text messages in a mobile device, it is preferred to use a high-resolution display to browse rich information content of text and images. A microdisplay-based system can provide full color pixels at 50-100 lines per mm. Such high-resolution is generally suitable for a virtual display. A virtual display typically consists of a microdisplay to provide an image and an optical arrangement for manipulating light emerging from the image in such a way that it is perceived as large as a direct view display panel. A virtual display can be monocular or binocular. [0003] The size of the beam of light emerging from ...

Claims

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Application Information

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IPC IPC(8): G02B27/44G02B5/18
CPCG02B27/4205G02B27/0081
Inventor LEVOLA, TAPANI
Owner NOKIA CORP
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