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Projection type displaying apparatus and prism used in said apparatus

A technology of a display device and a prism, which is applied in the field of prisms and can solve the problems of difficulty in realizing thinning of a projection type display device and the like

Inactive Publication Date: 2004-10-20
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, in a conventional projection display device using a DMD as an electro-optical device, a certain amount of space is required not only in the horizontal direction but also in the vertical direction as a space for arranging the illumination optical system. Therefore, there is a problem that it is difficult to realize the thinning of the projection display device

Method used

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  • Projection type displaying apparatus and prism used in said apparatus
  • Projection type displaying apparatus and prism used in said apparatus
  • Projection type displaying apparatus and prism used in said apparatus

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Embodiment Construction

[0034] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following embodiments, unless otherwise defined, the three mutually orthogonal axes are defined as x, y, and z, the traveling direction of light (direction parallel to the optical axis) is defined as the z axis, and The horizontal direction and the vertical direction are defined as the x-axis direction and the y-axis direction, respectively.

[0035] FIG. 1 is a schematic configuration diagram of a main part of a projection display device according to an embodiment of the present invention viewed on a plane. This projection display device 1000 includes an illumination optical system 100 , a micromirror light modulation device 200 , a prism 300 , and a projection lens (projection optical system) 400 . The micromirror-type light modulation device 200 and the projection lens 400 are arranged such that their respective central axes 200ax and 300ax coincid...

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Abstract

A projector of the type which uses an optical modulator that modulates light by controlling the emitting direction of light applied to a light illumination surface in accordance with image information is provided with a reduction in size. In the projector a prism has a selective reflection / transmission surface which reflects illumination light emitted from an illumination optical system and impinging thereupon, and causes the illumination light to impinge upon the light illumination surface of an optical modulator at a predetermined angle. The prism allows the modulated light emitted from the optical modulator to be transmitted therethrough and emits the light to the projection optical system.

Description

technical field [0001] The present invention relates to a projection display device for projecting and displaying an image and a prism used in the device. Background technique [0002] In a projection display device, modulated light is formed using an electro-optic device, and an image is displayed by projecting the modulated light. The so-called "electro-optic device" generally refers to a device that converts an electrical signal representing image information into modulated light. As such an electro-optical device, a light modulation device or the like that modulates light by controlling the emission direction of illumination light irradiated to each pixel based on image information is used. An example of the light modulation device is a micromirror-type light modulation device such as a digital micromirror device (registered trademark of Texas Instruments, Co. (TI). Hereinafter, referred to as "DMD"). [0003] The DMD has a plurality of micromirrors corresponding to a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/74G02B5/04G02B27/18G03B21/00H04N9/31
CPCH04N9/3197G02B5/04H04N9/3114H04N5/74
Inventor 加藤久麿西田和弘牛山富芳滝泽猛
Owner SEIKO EPSON CORP