公开(公告)号：US20200020833A1

公开(公告)日：2020-01-16

申请号：US16496622

申请日：2018-01-05

Applicant: LUMENS CO., LTD.

Inventor： Tae Kyung YOO ,  Seong Bok YOON

IPC: H01L33/50

Abstract: An LED display device according to one embodiment of the present invention is disclosed. The LED display device comprises: an LED substrate having a plurality of LED elements arranged in rows and columns for emitting first wavelength light; a first light conversion sheet, positioned on the LED substrate, which converts the first wavelength light into second wavelength light; and a second light conversion sheet, positioned on the first light conversion sheet, which converts the first wavelength light or the second wavelength light into third wavelength light

公开(公告)号：US20180277722A1

公开(公告)日：2018-09-27

申请号：US15889022

申请日：2018-02-05

Applicant: LUMENS CO., LTD.

Inventor： Tae Kyung YOO ,  Seong Bok YOON

IPC: H01L33/50 ,  H01L27/15

CPC classification number: H01L33/504 ,  H01L27/156 ,  H01L33/505

Abstract: Provided an LED display apparatus including: an LED substrate in which a plurality of LED elements emitting first-wavelength light are arranged in rows and columns; a first wavelength conversion sheet provided on the LED substrate and converting the first-wavelength light into second-wavelength light; and a second wavelength conversion sheet provided on the first wavelength conversion sheet and converting the first-wavelength light or the second-wavelength light into third-wavelength light.

公开(公告)号：US20180098400A1

公开(公告)日：2018-04-05

申请号：US15811626

申请日：2017-11-13

Applicant: LUMENS CO., LTD.

Inventor： Tae Kyoung YOO ,  Seong Bok YOON

IPC: H05B33/08

CPC classification number: H05B33/0857 ,  H05B33/0806 ,  H05B33/0809

Abstract: An improved lighting apparatus is disclosed. The lighting apparatus includes a direct current power supply unit, a light emitting unit operating in response to a direct current voltage applied from the direct current power supply unit, and a voltage control unit located between the direct current power supply unit and the light emitting unit to control the level of a voltage applied from the direct current power supply unit to the light emitting unit. The light emitting unit includes first light emitting groups having a first correlated color temperature and being turned on at a first turn-on voltage (VB) or above and second light emitting groups having a second correlated color temperature and being turned on at a second turn-on voltage (VA) greater than the first turn-on voltage. The first light emitting groups are connected in parallel with the second light emitting groups. The voltage control unit includes at least one variable resistor to control the level of the voltage applied to the light emitting unit such that the second light emitting groups emit light or are prevented from emitting light, achieving a desired correlated color temperature according to a preset proportion.

公开(公告)号：US20180368231A1

公开(公告)日：2018-12-20

申请号：US16109723

申请日：2018-08-22

Applicant: LUMENS CO., LTD.

Inventor： Tae Kyoung YOO ,  Seong Bok YOON

IPC: H05B33/08

CPC classification number: H05B33/0857 ,  H05B33/0806 ,  H05B33/0809

Abstract: An improved lighting apparatus is disclosed. The lighting apparatus includes a direct current power supply unit, a light emitting unit operating in response to a direct current voltage applied from the direct current power supply unit, and a voltage control unit located between the direct current power supply unit and the light emitting unit to control the level of a voltage applied from the direct current power supply unit to the light emitting unit. The light emitting unit includes first light emitting groups having a first correlated color temperature and being turned on at a first turn-on voltage (VB) or above and second light emitting groups having a second correlated color temperature and being turned on at a second turn-on voltage (VA) greater than the first turn-on voltage. The first light emitting groups are connected in parallel with the second light emitting groups. The voltage control unit includes at least one variable resistor to control the level of the voltage applied to the light emitting unit such that the second light emitting groups emit light or are prevented from emitting light, achieving a desired correlated color temperature according to a preset proportion.