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Projection device having a mode selection unit

A technology for projection equipment and mode selection, which is applied in the field of image projection devices and corresponding projected images, and can solve the problems of slow development and high cost of projection equipment

Inactive Publication Date: 2005-07-20
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the market for these projection devices is still developing slowly for home video applications due to high prices

Method used

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  • Projection device having a mode selection unit
  • Projection device having a mode selection unit
  • Projection device having a mode selection unit

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Experimental program
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Embodiment Construction

[0020] figure 1 The shown projection device according to the invention comprises a light source 1 with a curved reflector, ie a projection lamp, for example an ultra high pressure (UHP) lamp, an electro-optical light modulation device 22 and a projection lens 12 . The electro-optic light modulation device 22 includes three electro-optic light modulation plates 4, 5, 6, through which the green (G), red (R) and blue (B) of the image to be projected are realized respectively. )part. In addition, a lens 9 and a (two-way) folding mirror 10 are also arranged in the light modulating device 22, and the above devices are known per se, so details will not be repeated here. Furthermore, the light modulation device includes a two-way prism 23 arranged between the light modulation plates 4 , 5 , 6 and the projection lens 12 . A detailed description of such a projection device can be found in WO 01 / 19092.

[0021] In order to drive the light modulation device 22, a projection drive unit ...

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PUM

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Abstract

The invention relates to a projection device for projecting an image comprising a light source (1), electro-optical light modulation means (22) and image projection means (12) for projecting the image. In order to provide a projection device that can be used and is optimized for different modes, such as for video applications and business applications, the projection device according to the present invention further comprises a switchable module (3) comprising at least a first submodule (31), and a mode selection unit (20) for controlling said module (3) such that said first submodule (31) is either active or not active in the light path from said light source (1) to said image projection means (12), said first submodule (31) being adapted to improve the center brightness and white point of the light.

Description

technical field [0001] The invention relates to a projection device for projecting an image, comprising a light source, an electro-optic light modulation device and an image projection device for projecting an image. The invention also relates to a corresponding method of projecting an image. Background technique [0002] Projection devices, especially LCD projection devices, are becoming more and more common for business presentations, especially in the case of displaying graphics and / or PC data. However, the market for these projection devices is still developing slowly for home video applications due to high prices. Therefore, JP07084553 proposes a projection liquid crystal display device, even in the case of displaying video or PC images, which can obtain good contrast or brightness for each image display, and can obtain good display image quality. In this device, the diameter of the aperture in the imaging channel located in front of the projection lens is controlled ...

Claims

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Application Information

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IPC IPC(8): G02F1/13G02F1/1335G03B21/00H04N5/74H04N9/31
CPCH04N5/7416H04N9/3197H04N9/3105H04N5/7441H04N9/315H04N5/74H04N9/31
Inventor A·J·S·M·德瓦安
Owner KONINKLIJKE PHILIPS ELECTRONICS NV