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Optical element, light-source apparatus, and projection-type display apparatus

A technology of optical components and light source devices, applied in the field of optical components

Inactive Publication Date: 2012-11-14
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As described in Non-Patent Document 1, there is a restriction based on etendue, which is determined by the product of the area of ​​the light source device and the emission angle

Method used

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  • Optical element, light-source apparatus, and projection-type display apparatus
  • Optical element, light-source apparatus, and projection-type display apparatus
  • Optical element, light-source apparatus, and projection-type display apparatus

Examples

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no. 1 example ）

[0058] image 3 is a schematic diagram showing the configuration of the light source device according to the first embodiment. Figure 4 is an exemplary cross-sectional view showing the behavior of light in the light source device according to the present embodiment. In a light source device, each layer actually has a very large thickness, and there is a large difference in thickness between these layers. It is therefore difficult to draw the exact dimensions and proportions of these layers. Accordingly, in the drawings, the layers are not drawn to true scale and are therefore shown schematically.

[0059] Such as image 3 and Figure 4 As shown, the light source device 2 according to the present embodiment includes a plurality of light emitting elements 11 ( 11 a to 11 n ), and an optical element 1 into which light output from the light emitting elements 11 enters. The optical element 1 includes a light guide 12 and a directional control layer 13 , the light output from ...

no. 2 example ）

[0100] For the wave vector conversion layer 18 , instead of a photonic crystal, a configuration in which a microlens array is arranged or a configuration using a layer with a rough surface may be used. Figure 7 is a perspective view schematically showing the direction control layer included in the light source device according to the second embodiment.

[0101] Such as Figure 7 As shown, in the direction control layer 23 , the wave vector conversion layer 28 including a microlens array is arranged on the surface of the plasmon excitation layer 17 . Even in the configuration including the wave vector conversion layer 28 including the microlens array, the direction control layer 23 can provide the same effect as the configuration including the wave vector conversion layer 18 composed of photonic crystals.

[0102] Figure 8A and Figure 8B is an exemplary cross-sectional view showing a manufacturing process of a configuration in which a microlens array is stacked on plasmon...

no. 3 example ）

[0107] Figure 9 is a perspective view showing a direction control layer included in a light source device according to a third embodiment. Such as Figure 9 As shown, in the direction control layer 33 according to the third embodiment, the carrier generation layer 16, the plasmon excitation layer 17, the dielectric constant layer 19, and the wave vector conversion layer 18 are stacked on the light guide 12 in order.

[0108] Therefore, the third embodiment differs from the first embodiment in that dielectric constant layer 19 is independently arranged between plasmon excitation layer 17 and wave vector conversion layer 18 . The dielectric constant layer 19 has a dielectric constant set lower than that of the dielectric constant layer 20 (high dielectric constant layer 20 ) in the fourth embodiment described below, and is therefore called a low dielectric constant layer 19. Regarding the dielectric constant of low dielectric constant layer 19 , a range is allowed in which the...

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Abstract

A light-source apparatus is provided with: a carrier generation layer (16) wherein carriers are generated by light coming from a light-guiding body (12), into which light enters from light-emitting elements; a plasmon excitation layer (17) that has a plasma frequency higher than the frequency of light generated when the carrier generation layer (16) is excited by the light of the light-emitting elements; and a wave vector conversion layer (18) that converts surface plasmon generated by the plasmon excitation layer (17) into light having a prescribed angle of emergence, and radiates the light. The plasmon excitation layer (17) is sandwiched in between two layers having dielectricity. The effective dielectric constant of the incident-side section including the whole structure laminated at the light-guiding body (12) side of the plasmon excitation layer (17) is higher than the effective dielectric constant of the exit-side section, which includes the whole structure laminated at the wave vector conversion layer (18) side of the plasmon excitation layer (17) and the medium that is in contact with the wave vector conversion layer (18).

Description

technical field [0001] The present invention relates to an optical element, a light source device, and a projection display device that output light using surface plasmons. Background technique [0002] There has been proposed a light emitting diode (LED) projector using an LED as a light emitting element included in a light source device. This type of LED projector includes a light source device with LEDs, an illumination optical system into which light from the light source device enters, a light valve with a liquid crystal display panel into which light from the illumination optical system enters, and a The light is projected onto the projection optical system on the projection surface. [0003] In LED projectors, in order to increase the brightness of projected images, it is necessary to prevent light loss as low as possible on the light path from the light source device to the light valve. [0004] As described in Non-Patent Document 1, there is a limitation based on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21Y101/02
CPCG02B6/005B82Y20/00
Inventor 枣田昌尚今井雅雄斋藤悟郎富永慎
Owner NEC CORP
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