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Rotatable projection lens for rear-projection applications

A rear projection, lens technology, applied in the field of rotatable projection lens for rear projection applications, can solve problems such as difficult, non-retractable LC projection optical system, etc.

Inactive Publication Date: 2007-01-10
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is very difficult since LC projection optics are rather non-scalable designs

Method used

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  • Rotatable projection lens for rear-projection applications
  • Rotatable projection lens for rear-projection applications
  • Rotatable projection lens for rear-projection applications

Examples

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Embodiment Construction

[0016] In the following detailed description, for purposes of explanation and not limitation, example embodiments disclosing specific details are given in order to provide a thorough understanding of the example embodiments. However, other implementations that do not restrict themselves to the specific details disclosed herein will be apparent to those of skill in the art given the present disclosure. Moreover, descriptions of well-known devices, methods, and materials are omitted so as not to obscure the description of the present invention. Finally, the same reference numerals designate the same features wherever possible.

[0017] In short, according to an example embodiment, a projection optical system includes a first lens group, a folding mirror, and a second lens group selected as required. The first lens group has an optical axis perpendicular to the second lens group. A folding mirror is advantageously arranged between the first and second lens groups. Furthermore,...

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Abstract

An optical system for a projection display device includes a first lens group having a first optic axis and a second lens group having a second optic axis, wherein the second lens group is adapted to rotate about the first optic axis. Alternatively, the optical system includes a first optic axis, and a lens group having a second optic axis, wherein the lens group is adapted to rotate about the first optic axis.

Description

technical field [0001] Projection display devices are used in a variety of applications. Liquid crystal (LC) technology has found application in projection displays for projection televisions and electronic theaters, revealing several applications. Background technique [0002] In known rear projection applications, a rear surface mirror or rear fold mirror is used to project the image from the LC screen and projection optics onto a display surface or screen. The components of the display device, including the LC screen, projection optics and mirrors are housed in a cabinet, one surface of which has a display surface for viewing. [0003] Unfortunately, the enclosures used for these rear projection units are relatively large. Furthermore, known LC projection optics combinations are not easy to fit in all cabinets. As far as the former is concerned, it is desirable to reduce the depth and height of the chassis. However, this is very difficult because LC projection optics ...

Claims

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Application Information

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IPC IPC(8): H04N9/74H04N5/74
CPCH04N5/74G03B21/28H04N9/3141G03B21/10
Inventor A·G·C·范德帕伦丁铁英
Owner KONINKLIJKE PHILIPS ELECTRONICS NV