LED MODULE

• US 20160374170A1
• Filed: 06/27/2014
• Published: 12/22/2016
• Est. Priority Date: 06/28/2013
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Seoul Semiconductor Co., Ltd.
• Inventors: LEE, Jong Hyuk
• Granted Patent: US 10,201,055 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices

Abstract

A light emitting diode (LED) module includes LEDs driven by alternating current (AC) power, and LED groups, each of the LED groups including at least two of the LEDs. The LED module is configured to divide one cycle of the AC power into sections and sequentially turn on the plurality of LED groups based on the sections of the one cycle of the AC cycle. The color temperatures of the at least two LEDs have a range of deviation from a central color temperature.

Claims

1. A light-emitting diode (LED) module, comprising:

LEDs driven by alternating current (AC) power; and

LED groups, each of the LED groups comprising at least two of the LEDs,

wherein the LED module is configured to divide one cycle of the AC power into sections and sequentially turn on the LED groups based on the sections of the one cycle of the AC power, and

wherein color temperatures of the at least two LEDs have a range of deviation from a central color temperature.

2. The LED module of claim 1, wherein:

the LEDs are divided into at least two compartments having symmetric deviations from the central color temperature,

one of the LED groups is divided into the same number of subgroups as the at least two compartments, and

LEDs belonging to one of the at least two compartments belong to each of the subgroups.

3. The LED module of claim 2, wherein the LEDs belonging to the same compartment are uniformly distributed on an illumination surface.

4. The LED module of claim 1, wherein the LEDs are sequentially driven by at least one of dividing a sine wave of AC power and pulsating AC power into at least two sections based on time.

5. The LED module of claim 1, wherein:

the LED module is configured to divide at least one of a sine wave of AC power and pulsating AC power into at least two sections based on voltage levels, and

the LEDs are sequentially driven such that a number of LEDs belonging to a turned-on group or turned-on groups increases with increasing voltage levels.

6. The LED module of claim 1, further comprising:

a rectifier generating pulsating voltage by rectifying AC voltage; and

a constant current driver connected to each of the LED groups to sequentially drive each of the LED groups with a constant current.

7. The LED module of claim 1, wherein:

the LED groups are sequentially arranged on an illumination surface in a clockwise direction or a counterclockwise direction according to a turn-on sequence; and

two LEDs of each LED group have symmetric deviations from the central color temperature.

8. The LED module of claim 7, wherein the LED groups sequentially arranged on the illumination surface in the clockwise direction or the counterclockwise direction according to a turn-on sequence are repeatedly arranged in at least two cycles.

9. The LED module of claim 8, wherein at least one pair of LED groups having the same turn-on sequence among the LED groups is arranged to face each other.

10. The LED module of claim 7, wherein the groups occupy a broader area on the illumination surface in an earlier turn-on sequence.

11. The LED module of claim 1, wherein:

the LED groups are arranged to alternate clockwise turn-on and counterclockwise turn-on; and

two LEDs of each LED group have symmetric deviations from the central color temperature.

12. The LED module of claim 1, wherein:

the groups are sequentially arranged from an inner side to an outer side or from an outer side to an inner side on an illumination surface according to a turn-on sequence, and

two LEDs of each LED group have symmetric deviations from the central color temperature.

13. The LED module of claim 12, wherein the LED groups occupy a broader area on the illumination surface in an earlier turn-on sequence.