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Projection display with led-based illumination module

A lighting module, projection display technology, which is applied in the direction of using the image reproducer of the projection device, the picture replicator, the parts of the color TV, etc., can solve the problems of restricting the compact projection display device, etc., and achieve the effect of good light mixing

Inactive Publication Date: 2009-09-23
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
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Problems solved by technology

[0015] Furthermore, in order for the light beam leaving the integrating channel to have a substantially uniform brightness cross-sectional distribution, the length of this channel must be of considerable length, which limits the possibility of making compact projection display devices

Method used

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  • Projection display with led-based illumination module
  • Projection display with led-based illumination module
  • Projection display with led-based illumination module

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Embodiment Construction

[0054] The invention relates in one aspect to a projection display device comprising a lighting module and at least one projection lens for projecting light from the lighting module onto a projection screen. Typically, the projection display device further comprises image forming means arranged in the beam path between the illumination module and the at least one projection lens.

[0055] In another aspect, the invention relates to an image forming system for a projection display device. Such an image forming system comprises an illumination module and an image forming device arranged to be illuminated by light from the illumination module and to spatially modulate the illumination light into image light which can then be projected onto a projection screen.

[0056] Accordingly, any description herein of the illumination system and the image forming device applies to both the projection display device and the image light generating system.

[0057] In a typical projection dis...

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Abstract

A projection display device comprising an illumination module (100; 200; 301) and at least one projection lens (304) for projecting light from said illumination module (301) onto a projection screen (305) is provided. The illumination module (100) comprises at least two lighting units (103, 104), each comprising of a light emitting diode (113, 114) and a collimating funnel (130, 140) arranged in front thereof. The output areas (132, 142) of the two funnels are at least partly overlapping. Hence, light collimation and mixing is possible in the same structure, yielding an etendue conserving illumination module.

Description

technical field [0001] The invention relates to a projection display device comprising a lighting module and at least one image projection lens for projecting light from the lighting module onto a projection screen. The invention also relates to an image light generating system for a projection display device. Background technique [0002] A projection display device is a display device that projects an image onto a projection screen. Examples of projection display devices include, for example, rear projection televisions and computer image projectors. [0003] Typically, projection display devices include a light source that illuminates one or more image forming devices. Illumination light from the light source is reflected from or transmitted through the image forming device, and this reflected or transmitted illumination light is typically projected onto a screen via a system of projection lenses. [0004] Examples of image forming devices include transmissive and refl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/31
CPCH04N9/3197H04N9/315H04N5/74
Inventor M·P·C·M·克里恩R·P·范戈科姆
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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