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Projection display device

A display device and projection technology, which can be used in projection devices, TVs, color TVs, etc., and can solve the problems of difficulty in obtaining display images.

Inactive Publication Date: 2009-03-25
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the case where the display area of ​​the projection type light valve is rectangular, the projected image on the surface perpendicular to the optical axis has a trapezoidal shape; therefore, it is difficult to obtain a satisfactory display image

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A projection type display apparatus according to Embodiment 1 of the present invention will be described below with reference to FIGS. 1 and 2. FIG. FIG. 1 is a structural diagram of a projection display device according to Embodiment 1 of the present invention. FIG. 2 is an enlarged view of the vicinity of a reflective light valve constituting the projection display device shown in FIG. 1 . In Embodiment 1, a DMD similar to that shown in FIG. 8 is used as a reflective light valve, and FIGS. 1 and 2 show cross-sectional views along a plane perpendicular to the rotational axis of the micromirrors constituting the DMD. In addition, the movable range of the micromirror is ±10°.

[0047] First, the configuration and operation of a projection-type display apparatus according to Embodiment 1 will be described with reference to FIG. 1 . As shown in the example in Fig. 1, the projection type display device according to Embodiment 1 includes at least: a light source 101; an il...

Embodiment 2

[0064] A projection type display apparatus according to Embodiment 2 of the present invention will be described below with reference to FIGS. 3 and 4. FIG. 3A is a structural diagram of a projection display device according to Embodiment 2 of the present invention. 3B is a view of the entrance pupil of the projection optical system in the projection type display apparatus of Embodiment 2 of the present invention. 4 is an enlarged view of the central portion of the display area of ​​the reflective light valve constituting the projection type display device shown in FIG. 3 to show the light beam performance of the central portion. In Embodiment 2, the DMD previously used in Embodiment 1 is used as a reflection type light valve. 3 and 4 show cross-sectional views along a plane perpendicular to the rotational axis of the micromirrors constituting the DMD.

[0065] First, the configuration and operation of a projection-type display device according to Embodiment 2 will be describ...

Embodiment 3

[0097] A projection type display device according to Embodiment 3 of the present invention will be described below with reference to FIG. 5 . FIG. 5 is a structural diagram of a projection display device according to Embodiment 3 of the present invention. In Embodiment 3 as well, the DMD previously used in Embodiment 1 is used as a reflection type light valve. FIG. 5 shows a cross-sectional view taken along a plane perpendicular to the rotation axis of the micromirrors constituting the DMD.

[0098] The configuration and operation of a projection type display apparatus according to Embodiment 3 will be described below with reference to FIG. 5 . As shown in the example in FIG. 5, the projection display device according to Embodiment 3 at least includes: a light source 301; an illumination optical system 302 for converging the light irradiated from the light source 301 to form illumination light; type light valve (spatial light modulator) 316, which is used to reflect the illu...

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PUM

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Abstract

A projection display device, comprising a light source, an illuminating optical system forming illuminating light, a reflective light bulb forming a optical image by reflecting the illuminating light, a projection optical system projecting the optical image, and a positive power lens wherein the optical axis of the reflective light bulb, the optical axis of the projection optical system, and the optical axis of the positive power lens are aligned with each other, the illuminating light system is disposed so that the illuminating light is reflected by the reflective light bulb after passing through the positive power lens and the outgoing eye of the illuminating optical system 102 and the incidence eye of the projection optical system are disclosed so as to form a conjugate relation with the positive power lens.

Description

technical field [0001] The present invention relates to a projection type display device. Background technique [0002] As a method of obtaining a large screen image, it has been known in the past that an optical image is formed on a reflective light valve based on a video signal, and the optical image is irradiated with light to be projected on a screen in an enlarged state by a projection type lens system. If a reflective light distribution correction element (reflective light valve) for controlling the running direction of light to form an image according to a video signal is used, a projected image with higher light utilization efficiency and higher brightness can be provided. [0003] An example of an optical system of a conventional projection type display device using a reflective light valve is shown in FIG. 6 . As shown in FIG. 6, the light source 1 is composed of a bulb 1a and a concave mirror 1b. The concave mirror 1b is a parabolic mirror formed by vapor-deposi...

Claims

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Application Information

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IPC IPC(8): G03B21/00G02B27/18G02B13/16G02B19/00G03B21/14H04N5/74
CPCH04N5/7416G03B21/00G03B21/005
Inventor 伏见吉正枡本吉弘和田充弘
Owner PANASONIC CORP