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Optical element, light source device, and projection display device

A technology of optical components and light-emitting components, applied in the field of optical components

Inactive Publication Date: 2012-07-04
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 limitation based on etendue determined by the product of the area of ​​the light source device and the radiation angle

Method used

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  • Optical element, light source device, and projection display device
  • Optical element, light source device, and projection display device
  • Optical element, light source device, and projection display device

Examples

Experimental program
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no. 1 example

[0072] image 3 is a schematic perspective view showing the configuration of the light source device according to the first embodiment. Figure 4 is an explanatory cross-sectional view showing the behavior of light in the light source device according to the present invention. In the light source device, each layer actually has a very large thickness, and there is a large difference in thickness among the layers. Therefore, it is difficult to draw the various layers with precise scale and scale. Accordingly, in the drawings, the layers are not drawn to scale and are thus shown schematically.

[0073] Such as image 3 and 4 As shown in , a light source device 50 according to this embodiment includes a plurality of light emitting elements 1 (1a to 1n) and an optical element 51 into which light from the light emitting elements 1 is incident. The optical element 51 includes: a light guide body 2 into which the light output from the light emitting element 1 is incident; light...

no. 2 example

[0124] Figure 11 is a perspective view showing the directivity control layer included in the light source device according to the second embodiment. Such as Figure 11 As shown in , in the directivity control layer 18 according to the second embodiment, the carrier generation layer 16, the plasmon excitation layer 8, and the wave vector conversion layer 17 made of photonic crystals are sequentially stacked on the light guiding on body 2.

[0125] In the directivity control layer 18 according to the second embodiment, the wave vector conversion layer 17 also serves as the high dielectric constant layer 9 of the first embodiment, and the carrier generation layer 16 also serves as the low dielectric constant layer 9 of the first embodiment. Dielectric constant layer 7 . Therefore, in order to generate plasmon bonding at the plasmon excitation layer 8, the dielectric constant of the wave vector conversion layer 17 located adjacent to the exit-side interface of the plasmon exci...

no. 3 example

[0128] Figure 12 is a perspective view showing the directivity control layer included in the light source device according to the third embodiment. Such as Figure 12 As shown in , in the directivity control layer 19 according to the third embodiment, the carrier generation layer 6, the low dielectric constant layer 7, the plasmon excitation layer 8, and the wave vector conversion layer made of photonic crystal Layers 17 are stacked successively on the light guide 2 .

[0129] In the directivity control layer 19 according to the third embodiment, the wave vector conversion layer 17 also serves as the high dielectric constant layer 9 of the first embodiment. Therefore, in order to generate plasmon coupling at plasmon excitation layer 8 , the dielectric constant of wave vector conversion layer 17 is set higher than that of low dielectric constant layer 7 . However, even when the dielectric constant of wave vector conversion layer 17 is lower than that of low dielectric const...

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Abstract

Disclosed is an optical element which comprises: a light guide body into which the light from a light-emitting element enters; a carrier generation layer (6) which is provided to the light guide body and in which carriers are generated by the light from the light guide body; a plasmon excitation layer (8) that is arranged on the carrier generation layer (6) and has a plasma frequency higher than the frequency of the light that is generated when the carrier generation layer (6) is excited by the light from the light-emitting element; and a wave vector conversion layer (10) which is arranged on the plasmon excitation layer (8) and converts the light entering from the plasmon excitation layer (8) into light having a predetermined output angle. The plasmon excitation layer (8) is sandwiched between a low dielectric constant layer (7) and a high dielectric constant layer (9).

Description

technical field [0001] The present invention relates to an optical element using plasmon coupling to output light, a light source device and a projection display device. 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 having LEDs; an illumination optical system into which light from the light source device is incident; a bulb having a liquid crystal display panel into which light from the illumination optical system is incident. in the liquid crystal display panel; and a projection optical system for projecting the light from the bulb onto the projection surface. [0003] In LED projectors, in order to increase the brightness of the projected image, it is necessary to prevent light loss on the optical path from the light source device to the bulb as much as possible. [0004] As described in Non-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21Y101/02
CPCG02B6/0068F21S2/00G02B6/1226G02B6/005G02B6/0053B82Y20/00
Inventor 枣田昌尚
Owner NEC CORP
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