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US 9,853,189 B2Granted
Backlight module with MJT LED and backlight unit including the same
AssigneeSeoul Semiconductor Co., Ltd.
InventorsYoung Jun Song, Hyuck Jung Choi, Il Kyung Suh
Life of this patent
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Abstract
Embodiments of the disclosure provide a backlight module using MJT LEDs and a backlight unit including the same. More specifically, embodiments of the disclosure provide a backlight module, which includes MJT LEDs configured to increase an effective light emitting area of each of light emitting cells and optical members capable of uniformly dispersing light emitted from the MJT LEDs. In addition, embodiments of the disclosure provide a backlight unit using the backlight module, thereby reducing the number of LEDs constituting the backlight unit while allowing operation at low current.
Claims17
A backlight module comprising:
- a printed circuit board (PCB);
- a plurality of multi junction technology (MJT) light emitting diodes (LEDs) disposed on the PCB;
- and
- a plurality of optical members respectively disposed over each of the MJT LEDs, each optical member comprising:
- a light incident face through which light emitted from the corresponding MJT LED enters the optical member;
- and
- a light exit face through which light exits the optical member at a wider beam angle than that of the corresponding MJT LED,
- wherein each of the MJT LEDs comprises:
- a first light emitting cell and a second light emitting cell separated from each other on a growth substrate, the second light emitting cell having a slanted side surface;
- and
- an interconnection line electrically connecting the first light emitting cell to the second light emitting cell in series, the interconnection line comprising a first connection section for electrical connection to the first light emitting cell and a second connection section for electrical connection to the second light emitting cell,
- wherein each of the optical members further comprises:
- a lower surface having a concave section configured for light emitted from the MJT LED to enter the optical member;
- and
- an upper surface comprising a concave surface on a central axis of the optical member, the concave surface having a total internal reflection surface so as to form an apex on the central axis of the optical member, and
- wherein the concave section of the lower surface comprises:
- a first concave surface on the central axis;
- a second concave surface having a diameter greater than the first concave surface;
- and
- a downwardly protruding surface surrounding the first concave surface of the concave section and connecting the first concave surface to the second concave surface, the downwardly protruding surface comprising a portion disposed closer to the PCB than a portion of the second concave surface.
17 more elements
A backlight unit comprising:
- a backlight module comprising:
- a printed circuit board (PCB);
- a plurality of multi junction technology (MJT) light emitting diodes (LEDs) disposed on the printed circuit board;
- and
- a plurality of optical members respectively disposed over each of the MJT LEDs and each optical member including a light incident face through which light emitted from the corresponding MJT LED enters the optical member and a light exit face through which light exits the optical member at a wider beam angle than that of the corresponding MJT LED,
- wherein the light incident surface comprises:
- a first concave surface on a central axis;
- a second concave surface having a diameter greater than the first concave surface;
- and
- a downwardly protruding surface surrounding the first concave surface, the downwardly protruding surface comprising a portion disposed closer to the PCB than a portion of the second concave surface,
- wherein each of the MJT LEDs comprises:
- a first light emitting cell and a second light emitting cell separated from each other on a growth substrate, the second light emitting cell having a slanted side surface;
- and
- an interconnection line electrically connecting the first light emitting cell to the second light emitting cell in series, the interconnection line comprising a first connection section for electrical connection to the first light emitting cell and a second connection section for electrical connection to the second light emitting cell, and
- wherein each of the light emitting cells is configured to operate at an operating voltage of 2.5V to 4 V, and each of the MJT LEDs is configured to operate at an operating voltage of at least 10V or more;
- and
- a backlight control module comprising:
- an operating power generator configured for supplying DC operating voltage to the MJT LEDs within the backlight module;
- and
- an operation controller configured for independently controlling a dimming operation of the MJT LEDs,
- wherein the DC operating voltage supplied by the operating power generator is equal to or less than 48V.
18 more elements
Dependencies are inferred from the claim text.