KR20100033220A - Led light source and backlight unit employing the same - Google Patents

Led light source and backlight unit employing the same Download PDF

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Publication number
KR20100033220A
KR20100033220A KR1020080092287A KR20080092287A KR20100033220A KR 20100033220 A KR20100033220 A KR 20100033220A KR 1020080092287 A KR1020080092287 A KR 1020080092287A KR 20080092287 A KR20080092287 A KR 20080092287A KR 20100033220 A KR20100033220 A KR 20100033220A
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KR
South Korea
Prior art keywords
led
guide rod
light guide
light source
light
Prior art date
Application number
KR1020080092287A
Other languages
Korean (ko)
Inventor
이상민
Original Assignee
서울반도체 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 서울반도체 주식회사 filed Critical 서울반도체 주식회사
Priority to KR1020080092287A priority Critical patent/KR20100033220A/en
Publication of KR20100033220A publication Critical patent/KR20100033220A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • 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
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/0075—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources
    • F21V19/008—Fastening of light sources or lamp holders of tubular light sources, e.g. ring-shaped fluorescent light sources of straight tubular light sources, e.g. straight fluorescent tubes, soffit lamps

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

An LED light source is disclosed. The LED light source is a solid light guide rod formed long; An LED positioned at an end of the light guide rod with electrical contacts; A reflection member positioned along the longitudinal direction of the light guide rod to reflect light incident from the light guide rod; And a connector coupled to an end of the light guide rod on which the LED is located and having terminals in contact with the electrical contacts. Accordingly, the unit cost can be lowered by using one or two LEDs, and it is possible to provide a light source that can be used as a general lighting or a backlight light source by replacing a fluorescent lamp.

Description

LED light source and backlight unit employing it {LED LIGHT SOURCE AND BACKLIGHT UNIT EMPLOYING THE SAME}

The present invention relates to a light source and a backlight unit, and more particularly, to an LED light source and a backlight unit employing the same.

LED's low power consumption, long life and eco-friendliness make it a popular light source for backlights in liquid crystal displays. However, LED light sources that emit light uniformly over a wide area have not yet been realized. In the case of medium and large-sized LCDs, the backlight unit adopting a fluorescent lamp (CCFL) as a light source occupies most of them. In particular, in the case of medium and large LCDs, a large amount of LED arrays can be employed as the surface light source, but when the power consumption is high and the LEDs are not uniform, it is difficult to provide uniform surface light.

On the other hand, for the LED lighting lamp that emits the illumination light using a plurality of LEDs, Utility Model Registration No. 333212 "Lighting device for bridge railing" and the like are known in Korea.

LED lighting lamp according to the prior art including the utility model is made of a transparent material so that light is transmitted as shown in Figure 1, both ends of the light tube 100 is fitted with a cap 200 to shield; And a circuit board mounted on the inside of the light tube 100 to emit light from the inside of the light tube 100, and both ends of which are mounted with an LED 120 fixed to the cap 200 of the light tube 100. It consists of 150.

The LED lamp configured as described above has the effect that the LED 120 emits light in the interior of the light tube 100 so that the illumination light of the LED 120 elongates along the axial direction of the light tube 100 like a fluorescent lamp. There is.

However, the LED lamp is required to install the LED 120 along the axial direction of the light tube 100, and therefore requires a large number of LEDs 120. In particular, the LED 120 has a disadvantage in that the LED 120 is arrayed and applied in order to replace the fluorescent lamp because the area emitted from the chip is small and the direction angle is limited. As a result, the product cost increases, which makes it difficult to replace the fluorescent lamp. In addition, it is inconvenient to fix both ends of the circuit board 150 to the cap 200 at both ends of the light tube 100.

In addition, in the case of an AC LED used by being directly connected to an AC power source without an AC-DC converter, when a plurality of LEDs are connected in series, there is a problem in that an operating voltage is excessively high and power consumption is increased.

The problem to be solved by the present invention is to provide a LED light source that can reduce the quantity of LED to reduce the power consumption and product cost, and can replace the fluorescent lamp as a light source of the backlight unit as well as general lighting.

The problem to be solved by the present invention is to provide an LED light source capable of providing uniform surface light and a backlight unit employing the same.

In order to solve the above technical problems, the present invention discloses an LED light source and a backlight unit employing the same. LED light source according to an aspect of the present invention, the solid light guide rod formed long; An LED positioned at an end of the light guide rod with electrical contacts; A reflection member positioned along the longitudinal direction of the light guide rod to reflect light incident from the light guide rod; And a connector coupled to an end of the light guide rod on which the LED is located and having terminals in contact with the electrical contacts. Accordingly, it is possible to provide an LED light source having a shape similar to that of a conventional fluorescent lamp, and to provide an LED light source capable of emitting light only in a required direction by adopting a reflecting member.

A heat sink for radiating heat generated from the LED may be formed on an outer surface of the connector. In addition, the terminals may extend through the connector to the outside. The connector may be formed of a metal. In this case, an insulating layer is formed between the connector and the terminals to prevent the terminals from shorting.

Here, the LED may be an AC LED operated by an AC power source without an AC-DC converter. A scattering pattern may be directly formed on the surface of the light guide rod, or a sheet on which the scattering pattern is formed may be formed. The light guide rod may include a diffusing agent. In addition, the LED includes an LED chip and an encapsulation member surrounding the LED chip, and the light emitting surface on the encapsulation member is disposed to be in contact with a groove formed at an end of the light guide rod. Furthermore, the connector may be fastened to the optical guide rod by a screw.

The reflective member may be spaced apart from the light guide rod.

Alternatively, the reflective member may be located on a portion of the surface of the light guide rod to define a light emitting surface of the light guide rod. In this case, the reflective member may be a reflective sheet or a reflective coating layer.

The light emitting surface may be curved, but is not limited thereto, and may be flat. Uniform surface light may be emitted through the light emitting surface of the plane. In addition, the light guide rod may have an elongated hexahedron shape. The light emitting surface is defined on one surface of the hexahedral shape. Accordingly, uniform surface light may be emitted through the one surface, and by arranging such light sources, a surface light source for irradiating uniform light over a wide area may be provided. have.

The LED light source described above can be used as a backlight light source, and the backlight unit according to another aspect of the present invention adopts the LED light source as a backlight light source.

According to the present invention, it is possible to provide an LED light source and a backlight unit having a low product cost while suppressing an increase in power consumption by reducing the quantity of LEDs. In particular, the LED light source according to the present invention can replace the fluorescent lamp for lighting and backlight light source. Furthermore, according to the present invention, instead of the hollow glass like fluorescent lamps or incandescent lamps, the optical guide rods can be formed by using a hollow resin or the like. Furthermore, since the LEDs are used as semi-permanent lifetimes, the economic cost loss can be greatly reduced compared to conventional fluorescent lamps with short lifetimes.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided as examples to ensure that the spirit of the present invention to those skilled in the art will fully convey. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And, in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. Like numbers refer to like elements throughout.

2 is a perspective view of an LED light source according to an embodiment of the present invention, FIG. 3 is a partial cross-sectional view of FIG. 2, and FIG. 4 is a front view of FIG. 2.

2 to 4, the LED light source according to the present invention is a solid light guide rod 10 formed in an elongated, LED 20 formed at the end of the light guide rod 10, the light guide rod ( It includes a connector 30 and a reflective member 15 coupled to the 10.

The light guide rod 10 has a solid structure formed to fill a light-transmissive material, in particular, a light-transmissive resin material to the inside, so that the light generated from the LED 20 is uniformly colored, such as a fluorescent lamp. It can emit light for a long time. In addition, the light guide rod 10 may be filled with a light transmitting material containing a diffusing agent.

The light guide rod 10 may have a smooth surface, as shown in FIGS. 2 to 4, but may have a surface on which a scattering pattern is formed in order to obtain desired optical characteristics. 5 illustrates an embodiment in which the sheet on which the scattering pattern A is formed is formed on the surface of the light guide rod 10, for example, by an attachment method, and in FIG. 6, the scattering pattern A Another embodiment is shown forming B).

The reflective member 15 reflects the light incident from the light guide rod 10 to the reflective member 15. The reflective member 15 is positioned along the longitudinal direction of the light guide rod 10 so that the reflected light is irradiated in the opposite direction in which the reflective member 15 is located. The reflective member 15 may be spaced apart from the light guide rod 10, but is not limited thereto. As shown, the reflective member 15 may be formed in a portion of the surface of the light guide rod 10 to define the light emitting surface of the light guide rod 10. Accordingly, light is emitted through the surface of the light guide rod 10 in which the reflective member 15 is not formed. Conventional fluorescent lamps use a reflection shade to send light in the required direction, but when the reflection member 15 is formed on the surface of the light guide rod 10, such reflection shade can be removed. The reflective member 15 may be formed by attaching a reflective sheet to the light guide rod 10 or coating a reflective material on the surface of the light guide rod 10.

The LED 20 may be located at an end of the light guide rod 10 and may be located at both ends of the light guide rod 10. The LED 20 may be disposed such that a light emitting surface on the encapsulation member 24 surrounding the LED chip 23 is in contact with a groove formed to receive the LED 20 at an end of the light guide rod 10. . As shown in FIG. 3, the LED 20 is formed in a lead frame type, and includes leads 25 and 26 that are electrical contacts with respect to terminals of a connector to be described below. 26, a package body 21 (hereinafter referred to as a 'body') formed to support 26, an LED chip 23 attached to an upper surface of the lid 26 on the bottom surface of the cavity 21, and the LED chip 23. Encapsulating member 24 and a bonding wire (W). The LED 20 applied to the present embodiment is described as a lead frame type LED, but the present invention is not limited thereto.

In addition, the leads 25, 26, that is, the electrical contacts, are arranged such that one end thereof is in close proximity to each other, as shown in FIG. 3, and the other ends thereof extend in opposite directions to the outside of the body 21. It protrudes. However, although the other ends of the leads 25 and 26 protrude out of the body 21 on the drawing, the leads 25 and 26 are vias penetrating the body 21 up and down. It may also protrude to outside through).

The LED chip 23 may be, for example, an LED chip that emits blue light that is adopted for white implementation. In addition, the encapsulation member 24 may contain a phosphor, for example, a yellow phosphor.

The LED 20 applied to the present embodiment includes an AC LED operated by an AC power source without an AC-DC converter. Such AC LED is well represented in Korean Patent Publication No. 10-2006-0104160, and so description thereof is omitted.

On the other hand, the connector 30 is coupled to the end of the light guide rod 10 where the LED 20 is located. The connector 30 is coupled to both ends thereof when the LEDs 20 are formed at both ends of the light guide rod 10, respectively. The connector 30 and the optical guide rod 10, for example, may be threadedly coupled by a screw thread (S) as shown in Figures 3, 5, 6, or is light transmissive It may also be bonded using an adhesive.

As mentioned above, the connector 30 has terminals 32, 33 in contact with the leads 25, 26. The outer surface of the connector 30 may include a heat sink 31 having a heat radiation fin structure as shown in FIG. The heat sink 31 dissipates heat generated in the LED.

The terminals 32 and 33 penetrate the connector 30 and are exposed to the outside of the connector 30. In this case, the connector 30 may be formed of metal. When the connector 30 is made of metal, an insulating layer 34 is formed between the connector 30 and the terminals 32 and 33 to prevent the terminals 32 and 33 from being electrically shorted.

The LED light source having such a configuration is electrically connected to the leads 25 and 26 of the LED 20 in contact with the terminals 32 and 33 when an external power source is applied to the terminals 32 and 33. Therefore, light is generated from the LED chip 23 attached to one of the leads 25 of the LED 20. In this way, the light generated from the LED chip 23 is mixed and reflected inside the light guide rod 10 is emitted to the outside.

7 is a perspective view for explaining the LED light source according to another embodiment of the present invention.

Referring to FIG. 7, the LED light source according to the present embodiment is generally similar to the LED light source described with reference to FIGS. 2 to 4, but the shape of the light guide rod 50 is different. The difference will be described below.

The light guide rod 50 has an elongated hexahedron shape. One end of the hexahedral light guide rod 50 may be formed with a protrusion for coupling the connector 30 and a receiving groove for accommodating the LED.

On the other hand, one surface of the light guide rod 50 is defined as a light emitting surface. That is, the reflective member 55 is formed on the surface of the light guide rod 50 except for the light emitting region on one surface of the light guide rod 50.

According to this embodiment, the light emitted from the LED is mixed in the light guide rod 50 and reflected by the reflecting member 55 to be emitted to the outside through the light emitting surface defined on the one surface. Thus, uniform surface light can be provided by the LED light source. By arranging a plurality of such LED light sources, it is possible to provide uniform surface light over a wide area.

In the present embodiment, the case where the light guide rod has a hexahedral shape has been described, but is not limited thereto. For example, the light emitting surface defined by the reflecting member may be flat, other regions may be curved, and the light guide rod may have another polyhedral shape.

According to embodiments of the present invention, it is possible to provide an LED light source that can replace a fluorescent lamp, and can also provide an LED light source that provides uniform surface light over a wide area. Such an LED light source can be used as a backlight light source used in the backlight unit of the liquid crystal display. In particular, since it is possible to provide uniform surface light over a wide area, it can be used as a backlight light source of medium and large LCD as well as small LCD.

1 is a perspective view for explaining a conventional LED lighting apparatus.

2 is a perspective view for explaining an LED light source according to an embodiment of the present invention.

3 is a partial cross-sectional view of the LED light source of FIG. 2.

4 is a front view of the LED light source of FIG. 2.

5 is a cross-sectional view for describing an LED light source according to another embodiment of the present invention.

6 is a cross-sectional view for describing an LED light source according to still another embodiment of the present invention.

7 is a perspective view for explaining the LED light source according to another embodiment of the present invention.

Claims (14)

A solid optical guide rod formed in an elongated shape; An LED positioned at an end of the light guide rod with electrical contacts; A reflection member positioned along the longitudinal direction of the light guide rod to reflect light incident from the light guide rod; And And a connector coupled to an end of the light guide rod on which the LED is located, the connector having terminals in contact with the electrical contacts. The method according to claim 1, LED light source, characterized in that the heat sink for dissipating heat generated by the electrical contact and the terminals on the outer surface of the connector. The method according to claim 1, And the terminals extend outwardly through the connector. The method according to claim 3, The connector is made of a metal, characterized in that the insulating layer is formed between the connector and the terminals. The method according to claim 1, The LED light source, characterized in that it comprises an AC LED operated by AC power. The method according to claim 1, LED light source, characterized in that the sheet is formed on the surface of the light guide rod scattering pattern is formed. The method according to claim 1, LED light source, characterized in that the scattering pattern is formed directly on the surface of the light guide rod. The method according to claim 1, LED light source, characterized in that the light guide rod includes a diffusing agent. The method according to claim 1, The LED includes an LED chip and an encapsulation member surrounding the LED chip, wherein the light emitting surface on the encapsulation member is disposed so as to be in contact with the groove formed in the end of the light guide rod. The method according to claim 1, The connector is screw type LED light source, characterized in that fastened with the light guide rod. The method according to claim 1, And the reflecting member is positioned on a portion of the surface of the light guide rod to define a light emitting surface of the light guide rod. The method according to claim 11, The light emitting surface is a flat LED light source. The method according to claim 12, The light guide rod is an elongated hexahedral LED light source A backlight unit of a liquid crystal display, comprising the LED light source according to any one of claims 1 to 13.
KR1020080092287A 2008-09-19 2008-09-19 Led light source and backlight unit employing the same KR20100033220A (en)

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KR1020080092287A KR20100033220A (en) 2008-09-19 2008-09-19 Led light source and backlight unit employing the same

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Application Number Priority Date Filing Date Title
KR1020080092287A KR20100033220A (en) 2008-09-19 2008-09-19 Led light source and backlight unit employing the same

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KR20100033220A true KR20100033220A (en) 2010-03-29

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133941A (en) * 2011-12-01 2013-06-05 扬升照明股份有限公司 Backlight module

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103133941A (en) * 2011-12-01 2013-06-05 扬升照明股份有限公司 Backlight module
CN103133941B (en) * 2011-12-01 2016-05-18 扬升照明股份有限公司 Backlight module

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