Title:
BACK LIGHT UNIT AND DISPLAY DEVICE INCLUDING SAME
Document Type and Number:
WIPO Patent Application WO/2020/059993
Kind Code:
A1
Abstract:
The present invention relates to a back light unit which can implement matrix-type local dimming by using a cholesteric liquid crystal layer capable of switching in each of areas, and a display device including same, and a back light unit according to an embodiment comprises: a light guide plate; a light source disposed at a side surface of the light guide plate to introduce light into the light guide plate; a circularly-polarized-light reflecting layer disposed on the front surface of the light guide plate to reflect a first polarized light component among the components of light output from the light guide plate and allow a second polarized light component to be transmitted therethrough; and a cholesteric liquid crystal layer that is disposed on the front surface of the circularly-polarized-light reflecting layer and includes a plurality of areas, wherein each of the plurality of areas reflects the second polarized light component having passed through the circularly-polarized-light reflecting layer or allows same to be transmitted therethrough according to voltages applied to the areas.
Inventors:
CHO JIN HYUN (KR)
KANG KI HYUNG (KR)
KANG KI HYUNG (KR)
Application Number:
PCT/KR2019/004107
Publication Date:
March 26, 2020
Filing Date:
April 05, 2019
Export Citation:
Assignee:
SAMSUNG ELECTRONICS CO LTD (KR)
International Classes:
F21V8/00; G02B5/30
Domestic Patent References:
| WO2017175852A1 | 2017-10-12 |
Foreign References:
| KR20180053989A | 2018-05-24 | |||
| KR20160146263A | 2016-12-21 | |||
| US8698980B2 | 2014-04-15 |
Other References:
JIN-HUN KIM: "Bistable switching between homeotropic and focal-conic states in an ion-doped chiral nematic liquid crystal cell", OPTICS EXPRESS, 13 November 2017 (2017-11-13), XP055694073
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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