PLANAR LIGHT SOURCE, BACK-LIGHT UNIT, AND LIQUID CRYSTAL DISPLAY DEVICE

WIPO Patent Application WO/2017/175858

A1

The present invention addresses the problem of providing a thin planar light source which suppresses non-uniform rises in temperature across the plane of the light source, a back-light unit employing the same, and a liquid crystal display device which employs the back-light unit and which eliminates non-uniformity of color, or leakage of light when black is being displayed, arising from a non-uniform panel temperature distribution. This problem is resolved by means of a planar light source which includes a heat dissipating element, a reflecting element, an exciting light source, a wavelength converting element, and a brightness equalizing element, wherein: the exciting light source has a light emitting surface between the reflecting element and an emission surface of the planar light source, and releases first light; the wavelength converting element is located between the reflecting element and the brightness equalizing element, is thermally coupled to the heat dissipating element, and absorbs the first light and emits light having a wavelength different from the first light; and the reflectance of the brightness equalizing element with respect to light on the exciting light source side has an in-plane distribution.

YONEMOTO TAKASHI (JP)
TOYAMA HIROFUMI (JP)
OBA TATSUYA (JP)

PCT/JP2017/014506

October 12, 2017

April 07, 2017

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FUJIFILM CORP (JP)

F21S2/00; F21V7/22; F21V9/16; F21V29/503; F21V29/70; G02F1/13357; F21Y105/10; F21Y115/10

WO2011074366A1	2011-06-23
WO2016051745A1	2016-04-07

JP2012204349A

2012-10-22

WATANABE Mochitoshi et al. (JP)

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