Light emitting element and image display device using the light emitting element

Abstract

Disclosed is a light emitting element which emits linearly polarized light and has high efficiency and good productivity. The light emitting element can be configured to have a higher luminance. Specifically disclosed is a light emitting element comprising an active layer that is composed of a light emitting semiconductor, which is characterized by also comprising: a polarizer layer that transmits a polarized component in a first direction and reflects a polarized component in a second direction that is perpendicular to the first direction among the light generated in the active layer, said polarizer layer being formed on a semiconductor of the same group as the active layer and containing a semiconductor of the same group as the active layer or a metal; a reflective layer that is arranged on the opposite side of the polarizer layer with respect to the active layer and reflects the light reflected by the polarizer layer; and a wavelength plate layer that is arranged between the polarizer layer and the reflective layer and changes the polarization states of the light reflected by the polarizer layer and the light reflected by the reflective layer, said wavelength plate layer containing a semiconductor of the same group as the active layer.

Description

technical field [0001] The invention relates to a light-emitting element emitting linearly polarized light and an image display device using the light-emitting element. Background technique [0002] Image display devices using light emitting diodes (LEDs) as light emitting elements have been proposed. This type of image display device includes a structure including: a plurality of LEDs emitting light each having color components of red (R), green (G) and blue (B); an illumination optical system, The light emitted from the plurality of LEDs is incident in the illumination optical system; the light valve, which includes a liquid crystal display panel on which the light emitted from the illumination optical system is incident; a color synthesis prism, which synthesizes the light emitted from the light valve with light of each color; and a projection optical system for projecting the light emitted from the color synthesis prism onto the projection surface. Semiconductors are u...

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Problems solved by technology

[0005] In addition, as described in Non-Patent Document 1 (SID 06DIGEST, 2006, pp.1808-1811, 61.1, Photonic Lattice LEDs for RPTV Light Engines (Photonic Lattice LEDs for RPTV Light Engines), Christian Hoepfner), optical The efficiency of the system is limited due to the etendue, which is determined by the product of the area of ​​the light-emitting element and the radiation angle