KR20150098031A - LED(Light Emitting Diode) illumination module - Google Patents

LED(Light Emitting Diode) illumination module Download PDF

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Publication number
KR20150098031A
KR20150098031A KR1020140019069A KR20140019069A KR20150098031A KR 20150098031 A KR20150098031 A KR 20150098031A KR 1020140019069 A KR1020140019069 A KR 1020140019069A KR 20140019069 A KR20140019069 A KR 20140019069A KR 20150098031 A KR20150098031 A KR 20150098031A
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KR
South Korea
Prior art keywords
circuit board
printed circuit
wireless communication
communication module
led chips
Prior art date
Application number
KR1020140019069A
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Korean (ko)
Inventor
양진태
Original Assignee
삼성전기주식회사
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Priority to KR1020140019069A priority Critical patent/KR20150098031A/en
Publication of KR20150098031A publication Critical patent/KR20150098031A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)

Abstract

The present invention relates to a light emitting diode (LED) illumination module. The light emitting diode (LED) illumination module according to the present invention comprises: a print circuit substrate in which a predetermined circuit pattern is formed; a plurality of LED chips installed on one side of the print circuit substrate; a first power unit installed on the same side as the side of the print circuit substrate, in which the plurality of LED chips are installed, to convert AC prevailing source voltage into predetermined drive voltage and currents to supply the converted voltage and currents to the plurality of LED chips, and to control a drive of the LED chips; a wireless communication module installed to be electrically connected to the first power unit on the other side of the print circuit substrate, and to receive a drive control signal of the plurality of LED chips from an outdoor remote device to transmit the signal to the first power unit; and a second power unit to convert rectification voltage converted by the first power unit into direct current voltage in a different size to supply the converted voltage to the wireless communication module, wherein the wireless communication module is vertically coupled to the other side of the print circuit substrate. By the present invention, a wireless communication module and an LED driver can be installed in a narrow space having a socket shape, and a signal interference occurrence in wireless communication between the LED illumination module and a remote device can be prevented.

Description

LED lighting module {LED (Light Emitting Diode) illumination module}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED (Light Emitting Diode) lighting module, and more particularly, to an LED lighting module capable of minimizing the occurrence of signal failures in wireless communication between a lighting module and a remote device and reducing manufacturing costs.

LED has advantages such as low power consumption, semi-permanent lifespan, fast response speed, stability and environment friendliness compared to conventional light sources such as fluorescent lamps and incandescent lamps.

Accordingly, much research has been conducted to replace conventional conventional light sources with LEDs, and the use of LEDs as light sources for various lamps, liquid crystal display devices, electric sign boards, and street lamps used in indoor or outdoor is increasing .

Generally, the LED is driven by a DC power supply of several volts. Therefore, separate means are required to drive the LEDs using a commercially available AC power source for use in a home or a company. A separate driving means, that is, an LED driving device, is required to drive the LED with commercial AC power. Such an LED driving device includes a rectifying circuit for converting AC into DC, an AC-DC converter do.

However, since a general AC-DC converter is bulky and consumes a large amount of power, application of a general AC-DC converter to an LED driving device attenuates the advantages of LEDs such as high efficiency, small packaging size and long life. Therefore, recently, many researches have been made on a device (AC driver) capable of driving an LED directly by an AC power source without an AC-DC converter.

In recent years, smart light bulbs capable of controlling a smart phone or a tablet PC application by combining a wireless communication module such as the AC driver or a conventional power module have been recently released. However, in spite of many technical merits and conveniences, it is relatively expensive compared to conventional lighting devices and has not been well received.

On the other hand, an example of a conventional LED lighting apparatus is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0106799. The conventional LED lighting device disclosed in the patent publication includes a support frame provided with a coupling part for coupling with a socket on one side, and a module inserted and installed in the support frame. The module is composed of a power module and a wireless communication module, and the power module and the wireless communication module are stacked in the support frame.

Therefore, the conventional LED lighting apparatus as described above has a problem in that the assembly structure is complicated, and there is a high possibility that interference occurs in the signal on the wireless communication due to power supplied to the LED chip and heat generated in the power module. Particularly, when the wireless communication module is installed in the lower part of the power module based on the socket, there is a possibility that a signal failure in wireless communication may occur.

Korean Patent Publication No. 10-2008-0039847 Japanese Unexamined Patent Application Publication No. 2013-048106

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances and it is an object of the present invention to improve the arrangement structure of an AC driver and a wireless communication module to minimize the occurrence of signal failure in wireless communication between the LED lighting module and a remote device, So that the manufacturing cost can be reduced.

According to an aspect of the present invention, there is provided an LED lighting module including:

A printed circuit board (PCB) on which a predetermined circuit pattern is formed;

A plurality of LED chips mounted on one surface of the printed circuit board;

A plurality of LED chips disposed on the same surface of the printed circuit board on which the plurality of LED chips are mounted, the AC power source voltage being converted into a predetermined driving voltage and current to be supplied to the plurality of LED chips, A power supply unit;

A wireless communication module installed on the other surface of the printed circuit board to be electrically connected to the first power supply unit and receiving drive control signals of the plurality of LED chips from an external remote device and delivering the drive control signals to the first power supply unit; And

And a second power supply unit for converting the rectified voltage converted by the first power supply unit into a DC voltage of a different magnitude and supplying the DC voltage to the wireless communication module,

The wireless communication module is vertically coupled to the other surface of the printed circuit board.

According to another aspect of the present invention, there is provided an LED lighting module including:

A printed circuit board (PCB) on which a predetermined circuit pattern is formed;

A plurality of LED chips mounted on one surface of the printed circuit board;

A plurality of LED chips disposed on the same surface of the printed circuit board on which the plurality of LED chips are mounted, the AC power source voltage being converted into a predetermined driving voltage and current to be supplied to the plurality of LED chips, A power supply unit;

A wireless communication module installed on one surface of the printed circuit board to be electrically connected to the first power supply unit and receiving drive control signals of the plurality of LED chips from an external remote device and delivering the drive control signals to the first power supply unit; And

And a second power supply unit for converting the rectified voltage converted by the first power supply unit into a DC voltage of a different magnitude and supplying the DC voltage to the wireless communication module,

The wireless communication module is vertically coupled to one surface of the printed circuit board.

Here, the second power supply unit may be installed on the same surface of the first power supply unit and the printed circuit board.

In addition, the vertical coupling mechanism of the wireless communication module to the printed circuit board may include a plug having a multi-pin between the wireless communication module and the lower surface of the printed circuit board, and a receptacle accommodating the multi- Structure.

The vertical coupling mechanism may be configured such that female and male couplings of a socket are complementarily provided between the wireless communication module and a lower surface of the printed circuit board.

In addition, the vertical coupling mechanism may be configured such that an F-type connector is complementarily installed between the wireless communication module and a lower surface of the printed circuit board.

Also, the wireless communication module may be configured to perform wireless communication with an external remote device using a short-range wireless communication protocol such as Zigbee, Z-wave, Bluetooth low energy (BLE), Bluetooth or WiFi .

Also, a metal PCB may be used as the printed circuit board (PCB).

At this time, the printed circuit board may be formed of any one of circular, triangular, square, or rectangular polygonal metal PCB.

The plurality of LED chips may be arranged on the upper surface of the printed circuit board in any one of circular, triangular, square, and polygonal shapes.

At this time, when the printed circuit board is circular, the plurality of LED chips may be arranged radially with respect to the center point of the circle.

In addition, the driving control signal of the LED chip may include at least one of ON / OFF control of the LED chip, dimming control, color and color temperature control, and ON / OFF reservation.

According to the present invention, a wireless communication module and an LED driver can be installed in a small socket-shaped space, and signal interference in wireless communication between the LED lighting module and a remote device can be prevented.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a configuration of an LED lighting module according to an embodiment of the present invention; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an LED lighting module.
3 is a view showing a structure of a plug coupling receptacle provided on a back surface of a printed circuit board in an LED lighting module according to an embodiment of the present invention.
4 is a view schematically showing a configuration of an LED lighting module according to another embodiment of the present invention.
5 is a view showing a state in which an LED lighting module according to another embodiment of the present invention is applied to a flush-type luminaire.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor can properly define the concept of the term to describe its invention in the best way Should be construed in accordance with the principles and meanings and concepts consistent with the technical idea of the present invention.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the terms " part, "" module, "and" device " Lt; / RTI >

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view schematically showing a configuration of an LED lighting module according to an embodiment of the present invention. FIG. 2 is a schematic view of a circuit configuration of an LED lighting module according to an embodiment of the present invention.

1 and 2, an LED lighting module 100 according to an embodiment of the present invention includes a printed circuit board (PCB) 110, an LED chip 120, a first power source unit 130, (140) and a wireless communication module (150).

A predetermined circuit pattern (for example, a circuit pattern related to LED illumination) is formed on the printed circuit board 110. On the upper surface of the printed circuit board 110, 1 power supply unit 130 and a second power supply unit 140 are installed.

Here, the printed circuit board 110 is preferably a metal PCB. This is for efficiently emitting heat generated by the LED chip 120 and the LED driver 132 and the like.

Although the printed circuit board 110 has a circular shape in the present embodiment, the printed circuit board 110 is not limited to a circular shape, and any one of a polygonal metal PCB having a triangular shape, a square shape, It is possible. That is, polygonal metal PCBs of a triangle, square, or square or more, as well as a circular shape may be used depending on the shape and design conditions of the LED lighting apparatus to which the present invention is applied. Also, a general PCB having a separate heat sink may be used.

 A plurality of LED chips 120 are installed on at least one surface of the PCB 110. That is, the LED chip 120 is mounted on the upper surface of the printed circuit board 110 in the present embodiment, but may be provided on both the upper surface and the lower surface of the printed circuit board 110 in some cases. The LED chip 120 may be a substantially rectangular flat piece as illustrated, or may be an LED chip (or a light bulb) of various shapes such as an ellipse, a hemisphere, and a cylinder.

In addition, the plurality of LED chips 120 may be arranged on the upper surface of the PCB 110 in any one of circular, triangular, square, and polygonal shapes. That is, the plurality of LED chips 120 may be arranged in a circular shape on the upper surface of the printed circuit board 110 as shown in the drawing. When the printed circuit board 110 has a polygonal shape of a triangle, And may be arranged in a polygonal shape such as a triangle, a square, or a square corresponding to the shape. However, the arrangement of the plurality of LED chips 120 is not necessarily dependent on the shape of the printed circuit board 110, and a plurality of LED chips 120 may be formed on the printed circuit board 110 But may be arranged in various forms as above.

In addition, the plurality of LED chips 120 may be arranged in a circular shape as in the present embodiment when the printed circuit board 110 is circular, and may be disposed radially with respect to a center point of the circle in some cases . When the plurality of LED chips 120 are disposed in a radial pattern, a high brightness and a high efficiency different from those when the LED chips 120 are arranged in a circular shape can be obtained. In the on / off control and dimming control of the LED chip 120, Control becomes possible.

The first power supply unit 130 is installed on the same surface on which the plurality of LED chips 120 of the printed circuit board 110 are installed and is connected to the AC power supply voltage 201 (for example, AC 220V or AC 110V) Converts it into a predetermined driving voltage and current, supplies it to the plurality of LED chips 120, and controls the driving of the LED chip 120. The first power supply unit 130 includes a bridge diode 131 for converting an AC commercial power supply voltage 201 to a rectified voltage and a rectifier circuit for converting a rectified voltage (i.e., DC voltage) from the bridge diode 131 into a plurality of LED chips 120 and an LED driver 132 for controlling the driving of the LED chip 120. [ The LED driver 132 transmits the drive control signals of the plurality of LED chips 120 from the external remote device 160, for example, the smartphone 160a or the remote controller 160b, Module 150 and controls driving of the LED chip 120. [ At this time, the drive control signal of the LED chip 120 may include ON / OFF control of the LED chip 120, dimming control, color and color temperature control, and ON / OFF reservation.

The second power supply unit 140 converts the rectified voltage (i.e., DC voltage) converted by the bridge diode 131 of the first power supply unit 130 into a DC voltage of a different magnitude, . Here, the second power unit 140 may be a buck converter, a flyback converter, or the like.

An IC, an inductor, a capacitor, a resistor, a bridge diode, a general diode, a semiconductor switch device, and the like may be mounted on the printed circuit board 110 for the configuration of the first power source unit 130 and the second power source unit 140 .

The wireless communication module 150 is installed on a lower surface or an upper surface of the PCB 110 so as to be electrically connected to the first power source unit 130 and electrically connects the plurality of LED chips 120 and transmits the received drive control signal to the first power supply unit 130. [ The wireless communication module 150 may be detachably coupled to the lower surface or the upper surface of the printed circuit board 110.

The vertical detachable coupling mechanism includes a plug having a multi-pin between the wireless communication module 150 and the printed circuit board 110, and a receptacle accommodating the plug. . That is, a plug 150p having a multi-pin is provided on the side of the wireless communication module 150, and as shown in FIG. 3, the plug 150p is received in the lower surface of the printed circuit board 110 The plug 150p may be provided on the lower surface of the printed circuit board 110 and the receptacle 110r may be provided on the wireless communication module 150 side.

In addition, the vertical detachable coupling mechanism may be configured such that male and female coupling portions of a socket are complementarily installed between the wireless communication module 150 and the lower surface of the printed circuit board 110 .

In addition, the vertical detachable coupling mechanism may be configured such that the F-type connector is complementarily installed between the wireless communication module 150 and the upper or lower surface of the printed circuit board 110. Here, such an F-type connector is widely used for an antenna input terminal of a TV, a VTR, an FM tuner, or the like, and is used for a UHF or VHF coaxial cable. It has a tubular shape, the outer side is a screw type, and the inner side is made of coaxial core wire.

The wireless communication module 150 may be configured to perform wireless communication with an external remote device 150 using a local wireless communication protocol such as Zigbee, Z-wave, Bluetooth low energy (BLE), Bluetooth, WiFi . Here, the Zigbee has a physical layer (PHY) and a media access control layer (MAC) of the IEEE 802.15.4 standard. Z-wave is a wireless RF technology with a transmission rate of 10-40kbps at 900MHz band frequency and uses wireless mesh technology supporting two-way communication and has superior power consumption than Zigbee. In addition, BLE is a wireless communication protocol for data exchange at close range, requiring less energy than Bluetooth.

The wireless communication module 150 may be provided with a Zigbee IC, an antenna (e.g., a wire antenna) 150t, and an IC power supply capable of communicating by the wireless communication protocol. At this time, of course, only the Zigbee IC and the antenna 150t are provided in the wireless communication module 150 and the IC power supply may be provided in the second power supply unit 140 installed in the printed circuit board 110. [

4 is a view illustrating a configuration of an LED lighting module according to another embodiment of the present invention.

Referring to FIG. 4, the LED lighting module 400 according to another embodiment of the present invention is the same as the LED lighting module 100 according to the embodiment of the present invention described above.

5, a plurality of LED chips 420 are mounted on a ceiling, and the plurality of LED chips 420 are mounted on a ceiling, The wireless communication module 450 is vertically installed on the same surface of the printed circuit board 410 on which the wireless communication module 450 is installed.

The LED lighting module 400 according to another embodiment of the present invention includes a printed circuit board 410 on which a predetermined circuit pattern is formed and a plurality of LED chips 400 mounted on one surface of the printed circuit board 410. [ And a plurality of LED chips 420 of the printed circuit board 410 are installed on the same surface on which the plurality of LED chips 420 are mounted and the AC commercial power source voltage 201 (see FIG. 2) A first power supply unit 430 for supplying power to the plurality of LED chips 420 and controlling the driving of the LED chip 420 and a second power supply unit 430 for electrically connecting the first power supply unit 430 and the second power supply unit 430 to one surface of the PCB 410, And a wireless communication module 450 for receiving driving control signals of the plurality of LED chips 420 from an external remote device 160 (see FIG. 1) and transmitting the driving control signals to the first power source 430 ) And the DC voltage converted by the first power supply unit 430 into a DC voltage of a different magnitude, And a second power supply section 440 for supplying a new module 450. At this time, the wireless communication module 450 is vertically coupled to one surface of the printed circuit board 410, as described above. Such a vertical coupling mechanism can be applied to the same vertical detachable coupling mechanism as in the above-described embodiment. In FIG. 5, 450t represents a chip antenna for wireless communication with a remote device.

As described above, since the LED driver module according to the present invention is installed on the upper surface or the lower surface of the printed circuit board, it is possible to install the wireless communication module and the LED driver in a socket- Since the wireless communication module is installed vertically on the bottom surface of the circuit board, it is hardly affected by the heat generated from the LED chip or the LED driver, thereby preventing the signal interference in the wireless communication between the LED lighting module and the remote device .

In addition, since a wireless communication module and an AC driver can be installed in a small socket-shaped space, it is possible to reduce the manufacturing cost of a product by reducing the number of assembling processes in the manufacturing process of the LED lighting module product.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but many variations and modifications may be made without departing from the spirit and scope of the invention. Be clear to the technician. Accordingly, the true scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of the same should be construed as being included in the scope of the present invention.

100,400 ... (invention) LED lighting module 110, 410 ... printed circuit board (PCB)
120, 420, ..., LED chips 130, 430,
131 ... Bridge Diode 132 ... LED Driver
140, 440 ... second power source unit 150, 450 ... wireless communication module
160 ... remote device 110h ... antenna through hole
110r ... receptacle 150p ... plug
150t ... Antenna (wire antenna) 160a ... Smartphone
160b ... remote control 450t ... chip antenna

Claims (12)

A printed circuit board (PCB) on which a predetermined circuit pattern is formed;
A plurality of LED chips mounted on one surface of the printed circuit board;
A plurality of LED chips disposed on the same surface of the printed circuit board on which the plurality of LED chips are mounted, the AC power source voltage being converted into a predetermined driving voltage and current to be supplied to the plurality of LED chips, A power supply unit;
A wireless communication module installed on the other surface of the printed circuit board to be electrically connected to the first power supply unit and receiving drive control signals of the plurality of LED chips from an external remote device and delivering the drive control signals to the first power supply unit; And
And a second power supply unit for converting the rectified voltage converted by the first power supply unit into a DC voltage of a different magnitude and supplying the DC voltage to the wireless communication module,
Wherein the wireless communication module is vertically coupled to the other surface of the printed circuit board.
A printed circuit board (PCB) on which a predetermined circuit pattern is formed;
A plurality of LED chips mounted on one surface of the printed circuit board;
A plurality of LED chips disposed on the same surface of the printed circuit board on which the plurality of LED chips are mounted, the AC power source voltage being converted into a predetermined driving voltage and current to be supplied to the plurality of LED chips, A power supply unit;
A wireless communication module installed on one surface of the printed circuit board to be electrically connected to the first power supply unit and receiving drive control signals of the plurality of LED chips from an external remote device and delivering the drive control signals to the first power supply unit; And
And a second power supply unit for converting the rectified voltage converted by the first power supply unit into a DC voltage of a different magnitude and supplying the DC voltage to the wireless communication module,
Wherein the wireless communication module is vertically coupled to one surface of the printed circuit board.
3. The method according to claim 1 or 2,
Wherein the second power source unit is installed on the same surface of the first power source unit and the printed circuit board.
3. The method according to claim 1 or 2,
A mechanism for vertically coupling the wireless communication module to the printed circuit board includes a plug having a multi-pin between the wireless communication module and a lower surface of the printed circuit board, and a receptacle for accommodating the plug in a complementary manner Configured LED lighting module. 3. The method according to claim 1 or 2,
Wherein the vertical coupling mechanism comprises a structure in which female and male couplings of a socket are complementarily installed between the wireless communication module and a lower surface of the printed circuit board.
3. The method according to claim 1 or 2,
Wherein the vertical coupling mechanism has a structure in which an F-type connector is complementarily installed between the wireless communication module and a lower surface of the printed circuit board.
3. The method according to claim 1 or 2,
The wireless communication module is configured to perform wireless communication with an external remote device using a short-range wireless communication protocol such as Zigbee, Z-wave, Bluetooth low energy (BLE), Bluetooth or Wi-Fi.
3. The method according to claim 1 or 2,
Wherein the printed circuit board (PCB) is a metal PCB. 9. The method of claim 8,
Wherein the printed circuit board is formed of a metal PCB, and the printed circuit board is any one of a circular shape, a triangle shape, a square shape, and a polygonal shape having a square or more.
10. The method of claim 9,
Wherein the plurality of LED chips are disposed radially with respect to a center point of a circle when the printed circuit board is circular.
3. The method according to claim 1 or 2,
Wherein the plurality of LED chips are arranged on the upper surface of the printed circuit board in the form of a circle, a triangle, a square, or a polygon having a square or more.
3. The method according to claim 1 or 2,
Wherein the driving control signal of the LED chip includes at least one of ON / OFF control of the LED chip, dimming control, color and color temperature control, and ON / OFF reservation.
KR1020140019069A 2014-02-19 2014-02-19 LED(Light Emitting Diode) illumination module KR20150098031A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101654541B1 (en) * 2015-09-07 2016-09-07 인텍엘앤이 주식회사 Edge-lit led light apparatus capable of wireless control and method for controlling adjustable color temperature and dimming
WO2019080084A1 (en) * 2017-10-23 2019-05-02 深圳佳比泰智能照明股份有限公司 Intelligent ceiling lamp and control method therefor
WO2019080058A1 (en) * 2017-10-23 2019-05-02 深圳佳比泰智能照明股份有限公司 Intelligent power supply
US10327313B2 (en) 2017-02-10 2019-06-18 Samsung Electronics Co., Ltd. Lighting devices and lighting systems
WO2019216826A1 (en) * 2018-05-08 2019-11-14 Without-Jamaar Pte Ltd A battery controller
KR20200074653A (en) * 2018-12-17 2020-06-25 김성환 Remote Controllable and Portable Module-type Lantern having Buoyancy and Waterproof function
KR102363928B1 (en) * 2021-07-23 2022-02-17 주식회사 웰랑 Light emitting diode driver, light emitting module and display device for local dimming

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101654541B1 (en) * 2015-09-07 2016-09-07 인텍엘앤이 주식회사 Edge-lit led light apparatus capable of wireless control and method for controlling adjustable color temperature and dimming
US10327313B2 (en) 2017-02-10 2019-06-18 Samsung Electronics Co., Ltd. Lighting devices and lighting systems
WO2019080084A1 (en) * 2017-10-23 2019-05-02 深圳佳比泰智能照明股份有限公司 Intelligent ceiling lamp and control method therefor
WO2019080058A1 (en) * 2017-10-23 2019-05-02 深圳佳比泰智能照明股份有限公司 Intelligent power supply
WO2019216826A1 (en) * 2018-05-08 2019-11-14 Without-Jamaar Pte Ltd A battery controller
KR20200074653A (en) * 2018-12-17 2020-06-25 김성환 Remote Controllable and Portable Module-type Lantern having Buoyancy and Waterproof function
KR102363928B1 (en) * 2021-07-23 2022-02-17 주식회사 웰랑 Light emitting diode driver, light emitting module and display device for local dimming
US11765801B2 (en) 2021-07-23 2023-09-19 Wellang Co., Ltd. Led driver, light-emitting module, and display device for local dimming

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