Title:
LIGHT SOURCE DEVICE, METHOD FOR CONTROLLING LIGHT SOURCE DEVICE, PROGRAM, AND PROJECTION-TYPE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/173212
Kind Code:
A1
Abstract:
The purpose of the present invention is to efficiently obtain the light amount taking polarization efficiency into account. This invention is provided with: an excitation light source (43) for emitting excitation light; a phosphor (44) for releasing unpolarized fluorescent light when irradiated with the excitation light; a blue light source (45) for emitting linearly polarized blue light; a dichroic mirror (1g) for reflecting the excitation light emitted from the excitation light source and emitting the excitation light towards the phosphor, transmitting the unpolarized fluorescent light released from the phosphor on the basis of emission of the excitation light, and reflecting the linearly polarized blue light emitted from the blue light source in the same direction as that in which the unpolarized fluorescent light is transmitted; and a polarization conversion part (46), which converts the polarization of the unpolarized fluorescent light transmitted through the dichroic mirror to the same polarization as that of the linearly polarized blue light, and which does not convert the polarization of the linearly polarized blue light reflected by the dichroic mirror.
Inventors:
CHIKAHISA SHINICHIRO (JP)
Application Number:
PCT/JP2017/011809
Publication Date:
September 27, 2018
Filing Date:
March 23, 2017
Export Citation:
Assignee:
NEC DISPLAY SOLUTIONS LTD (JP)
International Classes:
G03B21/14; F21V5/00; F21Y115/30
Foreign References:
| JP2015106130A | 2015-06-08 | |||
| JP2013033226A | 2013-02-14 | |||
| JP2013182207A | 2013-09-12 | |||
| JP2013190674A | 2013-09-26 | |||
| US20150377430A1 | 2015-12-31 | |||
| JP2016066086A | 2016-04-28 | |||
| JP2012137744A | 2012-07-19 |
Attorney, Agent or Firm:
MIYAZAKI Teruo et al. (JP)
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