Projection type display apparatus having a light source and display element configured to provide increased lifespan of optical constituent components

Patent metadata

Field	Value
Publication number	US-9069237-B2
Application number	US-201414176209-A
Country	US
Kind code	B2
Filing date	Feb 10, 2014
Priority date	Jan 29, 2010
Publication date	Jun 30, 2015
Grant date	Jun 30, 2015

Abstract

A projection type display apparatus including a light source, a display element, an illumination optical system and a projection lens to project a magnified image of the optical image. The illumination optical system includes a first array lens and a second array lens, each includes a plurality of lens elements arranged in a matrix, each of the lens elements having a rectangular opening, and a polarization conversion element having polarization conversion function by use of a plurality of polarized beam splitters and a plurality of half-wave phase plates, arranged in an array and opposing to the lens elements of the second array lens, to emit predetermined polarized light. The light source includes a light emitting plane of a rectangle or an ellipse shape, a longitudinal direction of the light emitting plane being parallel to a longitudinal direction of each opening of the polarization conversion element.

First claim

The invention claimed is:

1. A projection type display apparatus, comprising:
a light source;
a display element;
an illumination optical system comprising a plurality of optical elements to enter light from the light source and to emit the light to the display element; and
a projection lens to magnify an optical image formed by the display element and to project a magnified image of the optical image,
wherein the illumination optical system comprises:
a first array lens…

Assignees

• Hitachi Maxell

Inventors

• Hirata Koji
• Kimura Nobuyuki

Classifications

• G03B21/2073 Primary

  Physics · mapped topic

• G03B21/14

  Physics · mapped topic

• G03B21/208

  Physics · mapped topic