Projection image displaying device

Abstract

Provided is a projection image displaying device that is easy to transport or post even if the display screen is scaled up in size, and that is also environmentally-friendly in that the energy required for transportation and carbon dioxide emissions have been reduced. The projection image displaying device magnifies and projects imaging light projected from an image projection unit, which projects an image displayed on an image displaying screen as imaging light, onto the back surface of a transmission screen. The image projecting unit comprises a skewed projection optical system, and the transmission screen (1) and a flat surface mirror (29) horizontally together, and each independently, are further provided so as to be vertically secured onto a cabinet portion (C) that includes a side board (17). Foldable back covers (30,31) are detachably attached onto the back surface side of the transmission screen so as to cover the back surface of the flat surface mirror.

Description

technical field [0001] The present invention relates to a projection type image display device (projection type image display device). Background technique [0002] As a large-scale video display device with an enlarged display screen, there is known a projection-type video projected onto a transmissive (transmissive) projection surface by a video projection unit that projects a video using a video display element such as a liquid crystal panel. Display device, and is being widely used. [0003] At present, for example, according to the following Patent Document 1, a structure has been disclosed in which an image projection unit is accommodated inside, and a device for reflecting the image from the image projection unit is installed at a predetermined inclination angle on the rear inner wall of a cabinet (chassis). The structure of the reflecting mirror, the box body is uprightly installed with a projection screen on the front surface. [0004] In addition, according to th...

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Problems solved by technology

Furthermore, the manufacture requires the necessary manufacturing precision, so there is a problem of increasing the manufacturing cost.

[0013] In addition, in the projection display device described in the above-mentioned Patent Document 2, although this problem is solved, it is difficult to obtain contrast when applied to a projection-type video display device that does not use a conventional video projection unit that does not use a hologram. high and bright image light

[0014] In addition, in the projection display device (projection display device) known from the above-mentioned Patent Document 3, regarding the assembly of a screen as a projection surface, an image projection unit for projecting an image, and a mirror for reflecting an image from the image projection unit The structure of the box that is integrally held together, the increase in the size of the box that occurs with the increase in the size of the above-mentioned display screen, and the difficulty and inconvenience in the handling and transportation of the device have not been sufficiently improved.

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