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Variable and serrated scanning in laser projectors

A scanning line and vertical scanning technology, applied in the direction of optics, instruments, color TV parts, etc., can solve the problem of increasing brightness

Inactive Publication Date: 2014-04-30
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Modulation of the horizontal scan speed on the fast scan axis has been considered to improve peak brightness in microdisplays, which has been incorporated into CRT displays to improve display sharpness at edges; however, this cannot be used to increase brightness

Method used

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  • Variable and serrated scanning in laser projectors
  • Variable and serrated scanning in laser projectors
  • Variable and serrated scanning in laser projectors

Examples

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Embodiment Construction

[0023] To increase the peak brightness of laser-based or LED-based microdisplays and to maintain and / or improve image uniformity, embodiments of the invention disclose modulations including scan rates and / or zigzag scan patterns. Zigzag scanning, which will be described in more detail below, can often be achieved by having some pixel offset in the vertical and / or horizontal scan profile, where pixel offset is in the dimension of the locus with respect to the point Some tiny oscillations. Minor oscillations mean that the pixel offset motion is significantly less than, or a fraction of, the full range of scanning motion in that dimension.

[0024] Unlike in CRTs where blanking horizontal foldback intervals are required to produce a uniform horizontal scan pattern, an important consideration in incorporating the microdisplays of the present invention is that blanking horizontal foldback is impractical. The reason is that the horizontal foldback will reduce the effective display ...

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Abstract

A miniature projector is provided that comprises: a means for providing at least three different light beams of different color; and a means for scanning the light beams; wherein the scanning means is adapted to scan the light beams according to a pattern from a first edge to an ending edge in the screen to form an image, the pattern being a wave pattern of scan lines such that amplitudes oscillates along a first axis as the beams progressively scan along a second axis, the second axis being perpendicular to the first axis, and wherein the wave pattern is a composite of a vertical scan profile and a horizontal scan profile and the vertical scan profile has a cyclic wobulation corresponding to the amplitudes.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application 61 / 520,067, filed June 3, 2011, which is hereby incorporated by reference in its entirety, and is also related to U.S. Provisional Application 61 / 520, filed June 3, 2011 520,068. technical field [0003] The present invention relates to a pico projector and a method for operating a pico projector. Background technique [0004] Miniature laser projectors, known as picture projectors, nanoprojectors, and microprojectors, are typically battery-operated, portable projectors that are gaining in popularity due to their small size for certain applications. The device can be connected to a handheld or laptop and can display images on a screen or on a wall. [0005] Unfortunately, pico laser projectors typically exhibit low light output and are therefore limited to use in environments with low ambient background light. These laser-based units typically display ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/74H04N5/262G09G3/02
CPCG09G3/025G09G3/002H04N9/3135G09G2360/16H04N5/2628H04N5/74G09G2320/0626G03B21/00G09G3/02
Inventor M·F·鲁姆雷克
Owner THOMSON LICENSING SA
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