KR101372449B1 - Led bar and backlight unit using the same - Google Patents

Led bar and backlight unit using the same Download PDF

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Publication number
KR101372449B1
KR101372449B1 KR1020120098019A KR20120098019A KR101372449B1 KR 101372449 B1 KR101372449 B1 KR 101372449B1 KR 1020120098019 A KR1020120098019 A KR 1020120098019A KR 20120098019 A KR20120098019 A KR 20120098019A KR 101372449 B1 KR101372449 B1 KR 101372449B1
Authority
KR
South Korea
Prior art keywords
light
light source
led
light guide
emitting diode
Prior art date
Application number
KR1020120098019A
Other languages
Korean (ko)
Inventor
오태근
송용욱
Original Assignee
희성전자 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 희성전자 주식회사 filed Critical 희성전자 주식회사
Priority to KR1020120098019A priority Critical patent/KR101372449B1/en
Priority claimed from PCT/KR2013/007670 external-priority patent/WO2014038807A1/en
Application granted granted Critical
Publication of KR101372449B1 publication Critical patent/KR101372449B1/en

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051Diffusing sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073Light emitting diode [LED]
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075Arrangements of multiple light guides
    • G02B6/0078Side-by-side arrangements, e.g. for large area displays
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side

Abstract

The present invention relates to a light emitting diode bar array in which a plurality of light emitting diode bars in which a light emitting diode light source is arranged on a side of a light guide of a bar is arranged, and a backlight device having the same. A light guide member provided with a groove-shaped light source under the side end portion; And an LED light source disposed in the light source unit of the light guide body, wherein a plurality of LED bars are arranged to emit light incident from the LED light source along a length direction, and the light guide body has a reflection pattern on an upper emission surface of the light source unit. It is characterized in that it is formed.

Description

Light emitting diode bar and backlight unit having same {LED Bar and Backlight unit using the Same}

The present invention relates to a backlight device, and more particularly, to a light emitting diode bar array in which a plurality of light emitting diode bars in which light emitting diode light sources are arranged on a side of a light guide of a bar shape is arranged, and a backlight device having the same.

The backlight device is a device for dimming a liquid crystal display with a surface light source, and is classified into a direct type backlight device and a side type backlight device according to an arrangement position of a light source. The side backlight device is advantageous for slimming the backlight device, but has a disadvantage in implementing a large screen backlight device. The direct backlight device is advantageous for the large screen device, but the backlight device is thick and requires a plurality of light sources. There are disadvantages. As a light source of such a backlight device, a light emitting diode (hereinafter referred to as “LED”) is mainly used, and light switching members for converting a point light source of the LED into a surface light source are used together.

BACKGROUND ART [0002] In recent years, a backlight device capable of compensating for the drawbacks of a side-type backlight device and a direct-type backlight device by disposing an LED light source on a side portion of a bar- For example, the present invention has been disclosed in the side dimming backlight device using an LED bar (LED Bar) in Korea Patent No. 10-0953163.

As shown in FIG. 1, the general backlight device using the LED bar 30 includes an LED light source 32 on both sides of the light guide 31 in the longitudinal direction inside the cover bottom 10 to which the reflecting plate 20 is attached. Attached to this, a plurality of LED bars 30 having a predetermined length are arranged to form an array. A diffusion plate, a prism sheet, and the like are stacked on the upper side of the array of LED bars 30 as a light control member 40 for emitting the light of the line light source by the LED bar 30 to the surface light source. It is fixed.

Meanwhile, in the LED bar according to the related art, the LED light source 32 is attached to both sides of the bar-shaped light guide 31 having a predetermined length, as shown in FIG. 2. Here, the light guide 31 may have a curved surface having various shapes in order to emit light at a wide direct angle, and various patterns for light scattering and light extraction may be formed on the bottom or side surfaces.

However, the LED bar 30 according to the related art has a structure in which the LED light source 32 is disposed at the side and is covered by a structure such as the cover bottom 50. Since the top of the structure must extend inward to a certain width in order to hide the light source, this in turn presents a limit to reducing the width of the bezel.

In addition, since the light sources 32 are disposed at both sides of the light guide 31 having a predetermined length, the light source may be damaged by thermal expansion in the longitudinal direction due to high temperature, and the light guide itself may be bent or twisted. Deformation of may occur.

The present invention has been proposed to solve the above problems, the light guide of the LED bar to cover the LED light source, the LED structure that can minimize the width of the bezel do not need a separate structure to cover the light source An object of the present invention is to provide a bar array and a backlight device using the same.

In addition, an object of the present invention is to provide a LED bar array and a backlight device using the same, which can prevent a hot spot caused by a point light source and prevent damage to a light source and deformation of a light guide due to thermal expansion. do.

LED bar array of the present invention for achieving the above object, the light guide member is provided with a light source of the groove shape at the lower side of at least one side end; And an LED light source disposed in the light source unit of the light guide, wherein a plurality of LED bars are arranged to emit light incident from the LED light source along a length direction, and the light guide is reflected on an emission surface above the light source. A pattern is formed.

Here, the LED bar having a light source disposed only at one end thereof is disposed symmetrically with each other such that the light of the LED light source is directed from the center to the outside, or symmetrically with each other such that the light of the LED light source is directed from the outside with the center. Characterized in that arranged.

In addition, the light guide is characterized in that the plane of the end of the light source is not disposed is formed of a curved surface or polygonal, or the upper or lower side of the end of the light source is not disposed is a curved surface or an inclined surface.

In addition, the backlight device of the present invention for achieving the above object, the cover bottom is provided with a storage space therein; An LED bar array composed of any one of claims 1 to 5 disposed inside the cover bottom; And a light control member disposed above the LED bar array to control light from the LED bar array to planar light, wherein the light control member includes a reflection pattern formed on a bottom surface of the LED light source. It is characterized by.

In the backlight device having the above-described configuration, since the LED light source is disposed in the light source unit provided at the lower end of the light guide, and a part of the light guide covers the LED light source, the width of the bezel is minimized because the LED light source is not limited by the bezel width. You can do

In addition, the LED bar array configured as described above can prevent the hot spot phenomenon caused by the point light source, and prevent damage to the light source and deformation of the light guide due to thermal expansion.

1 is an exploded perspective view showing a general structure of a backlight device using an LED bar;
Figure 2 is a perspective view showing an example of the LED bar according to the prior art which is the main part of Figure 1,
3 is an exploded perspective view showing a backlight device according to an embodiment of the present invention,
4 is a perspective view showing an LED bar array according to an embodiment of the present invention;
5 is a perspective view showing an LED bar array according to another embodiment of the present invention;
6 is a plan view showing a light guide according to an embodiment of the present invention;
7 is a side view showing a light guide according to an embodiment of the present invention, and
8 is a schematic cross-sectional view illustrating a backlight device according to an exemplary embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a reflection sheet 200 is mounted inside the cover bottom 100 of the rectangular plate-shaped backlight device according to an embodiment of the present invention, a plurality of LED bar 310 is disposed on the reflective sheet 200 Configure the LED bar array 300. The light control member 400 including the diffusion plate 410 and the prism sheet 420 is stacked on the LED bar array 300 and fixed by the guide panel 500. Here, the LED bar 310 is a light source 330 is disposed on one side or both sides of the light guide 320 in the longitudinal direction to form a line light source. In the present invention, the configuration of the cover bottom 100, the reflective sheet 200 and the guide panel 500 may be applied to a publicly known technique, the following will be described in detail with respect to the LED bar array 300.

4 and 5 are perspective views showing an LED bar array according to an embodiment of the present invention. As can be seen from these figures, the LED bar 310 constituting the LED bar array 300 has a structure in which the LED light source 330 is disposed on the side of the light guide body 320 having a predetermined length. To achieve. The LED bar 310 having such a structure emits light from the LED light source 330 as a linear light source in a longitudinal direction, and functions as a fluorescent lamp light source.

Here, the light guide 320 functions to totally reflect the light of the point light source incident at the end in the longitudinal direction to emit the light of the line light source to the upper surface or the other side. The light guide 110 is a transparent or translucent resin is used, for example, PMMA resin may be used. In addition, the upper surface of the light guide 110 may be formed in a curved surface for a wide orientation angle.

In particular, the light guide body 320 according to the present invention has a light source unit 321 in which the LED light source 330 may be disposed at one or both ends. The light source unit 321 is formed in a groove shape in which a lower portion of the end is cut, and the extension part 322 of the upper surface is formed to cover the LED light source 330 disposed in the light source unit 321. The extension part 322 formed above the light source 321 prevents the light emitted from the LED light source 330 from being directly emitted upward and leaking, and at the same time the LED light source 330 is assembled during assembly of the backlight device. No extra construction is required to hide, minimizing the width of the bezel.

In addition, the light guide body 320 has a reflective pattern 323 formed on an upper surface of the light source unit 321. Since light is relatively strong near the light source 321, the reflective pattern 323 reflects a part of light inward from the boundary surface of the light guide 320 to prevent hot spots in the light source 321 region due to strong light. prevent. The reflective pattern 323 may have various shapes such as a dot shape, and is formed on the emission surface above the light source unit 321 having a width greater than at least the width of the light source unit 321 in the longitudinal direction.

The LED light source 330 functions as a light source for injecting light into the light guide body 320 and is disposed inside the light source unit 321 of the light guide body 110. In this case, when the light source unit 321 is formed at both ends of the light guide body 320, the LED light source 330 is also disposed at both sides of the light guide body 320 to inject light toward the inside.

The LED bar 310 functions as a line light source, and a plurality of LED bars 310 are arranged at regular intervals in a horizontal direction to constitute the LED bar array 300. In this case, the LED bar 310 in which the light source unit 321 is formed only on one side of the light guide 320 is disposed such that the LED light source 330 is located at the center, as shown in FIG. 4, or is illustrated in FIG. 5. As described above, the LED light source 330 may be disposed outside.

First, as shown in FIG. 4, when the LED light source 330 is disposed at the center, the light travels outward from the center of the LED bar array 300. In this structure, since the LED light source 330 is located at the center of the entire backlight structure, a separate bezel area is not required to cover the LED light source at the edge. The LED light source 330 at the center part is covered by the extension part 322 formed in the light source part 321 of the light guide body 320, and the hot spot by the light source is reflected on the reflective pattern 323 on the upper surface of the light guide body 320. Can be prevented. In addition, in such a structure, since the fixing structure of the light guide body 320 is formed in the center portion, the light guide body 320 expands from the center portion to the outside in the longitudinal direction during thermal expansion due to high temperature, so there is no fear of warpage or damage. Optical performance and reliability can be maintained.

And, as shown in Figure 5, the LED light source 330 may be disposed on the outside, although not shown, the LED light source 330 is also arranged in both the central portion and the outer side is possible.

On the other hand, when the LED light source 330 is disposed only on one side of the light guide to incident light therein, the intensity of the light emitted from the inside of the light guide varies depending on the distance from the light source 330 or at the edge of the end. A phenomenon may occur and optical property may fall. In order to prevent this, end portions of the light guide on the opposite side where the light source is not disposed may form various shapes or light patterns may be formed.

6 is a plan view illustrating a light guide according to an exemplary embodiment of the present invention, and FIG. 7 is a side view illustrating the light guide according to an exemplary embodiment of the present invention and illustrates end portions of the light guide having various shapes. These shapes effectively disperse the light concentrated at the ends to prevent appearance defects caused by light scattering.

First, as shown in FIG. 6, the plane of the end of the light guide 320 is formed into a curved surface a or a polygon b. When the end of the light guide 320 is formed at right angles, hot spots may occur due to the light simmering phenomenon in which light is concentrated at a vertex portion at which the edges of both sides are perpendicular to each other. When forming a curved surface or a polygon, it is possible to prevent such light leakage phenomenon.

In addition, as illustrated in FIG. 7, the side surface of the light guide 320 may have various shapes. When the light source unit 321 is formed only on one side of the light guide 320, light scattering may occur in which light is concentrated along the side edges of the other end. In order to prevent this, in the present invention, the ends of the light guide body 320 form various shapes to disperse light. That is, the light guide member 320 may form a curved surface (a, c) or an inclined surface (b, d) of the spherical or aspherical surface of the end, the surface or the slope of the prism pattern or dot pattern The light scattering pattern 324 may be further formed (c, d). The light scattering pattern 324 may induce scattering or reflection of light totally reflected inside the light guide 320 to improve luminance at the end of the light guide 320.

8 is a schematic cross-sectional view illustrating a backlight device according to an exemplary embodiment of the present invention. As shown, a plurality of LED bars 310 are disposed inside the cover bottom 100 to form the LED bar array 300, and the diffusion plate 410 at a predetermined interval on the upper side of the LED bar 310. Light control member 400 including a is disposed.

In the backlight device of the present invention, the reflective pattern 323 is formed on the upper surface of the light guide body 320 of the LED bar 310 to prevent light scattering. The reflective pattern 411 may be further formed. The reflective pattern 411 of the diffuser plate 410 may also have various shapes such as a dot shape, and may be formed to have a predetermined width at a central portion where the LED light source 330 is disposed. . In addition, the reflective pattern 411 may be formed to have a width larger than at least the widths of both light sources 321, and may be formed while varying shapes and densities toward the outside with respect to the central LED light source 330.

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.

100: cover bottom 200: reflective sheet
300: LED bar array 310: LED bar
320: light guide 330: LED light source
400: light control member 500: guide panel
321: light source 322: extension
323, 411: reflection pattern 324: light scattering pattern

Claims (8)

  1. A bar-shaped light guide member provided with a groove-shaped light source portion in which at least a portion of a lower side of the one end portion is cut; And an LED light source disposed in the light source of the light guide to provide light into the light guide.
    A light emitting diode bar for emitting the light of the point light source incident from the LED light source to the light of the line light source along the longitudinal direction.
  2. The method of claim 1, wherein the light guide is
    The light emitting diode bar, characterized in that the reflective pattern is formed on the emission surface above the light source.
  3. delete
  4. delete
  5. 3. The method according to claim 1 or 2,
    The LED light source is disposed only at one end of the light guide,
    The light guide is a light emitting diode bar, characterized in that the plane of the end portion is not arranged light source is formed in a curved or polygonal.
  6. 3. The method according to claim 1 or 2,
    The LED light source is disposed only at one end of the light guide,
    The light guide is a light emitting diode bar, characterized in that the upper surface or the lower surface of the end is not arranged light source or curved surface.
  7. A cover bottom provided with a storage space therein;
    A light emitting diode bar array in which a plurality of light emitting diode bars of claim 1 or 2 are disposed in the cover bottom; And
    And a light control member disposed on the light emitting diode bar array to control light from the light emitting diode bar array to planar light.
  8. The method of claim 7, wherein the light control member,
    A backlight device, characterized in that the reflective pattern is formed on the lower surface.
KR1020120098019A 2012-09-05 2012-09-05 Led bar and backlight unit using the same KR101372449B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120098019A KR101372449B1 (en) 2012-09-05 2012-09-05 Led bar and backlight unit using the same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR1020120098019A KR101372449B1 (en) 2012-09-05 2012-09-05 Led bar and backlight unit using the same
PCT/KR2013/007670 WO2014038807A1 (en) 2012-09-05 2013-08-27 Light guide bar and backlight device with same
US14/425,907 US10107956B2 (en) 2012-09-05 2013-08-27 Light guide bar and backlight device with the same
US16/148,058 US20190107668A1 (en) 2012-09-05 2018-10-01 Light guide bar and backlight device with the same

Publications (1)

Publication Number Publication Date
KR101372449B1 true KR101372449B1 (en) 2014-03-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120098019A KR101372449B1 (en) 2012-09-05 2012-09-05 Led bar and backlight unit using the same

Country Status (1)

Country Link
KR (1) KR101372449B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050066715A (en) * 2003-12-27 2005-06-30 엘지.필립스 엘시디 주식회사 The back light assembly and the method for driving the same
KR20080066876A (en) * 2006-01-10 2008-07-16 로무 가부시키가이샤 Light guiding member and linear light source apparatus using same
KR20090071488A (en) * 2007-12-27 2009-07-01 삼성전기주식회사 Backlight unit for liquid crystal display device
KR20100103736A (en) * 2009-03-10 2010-09-28 엘지이노텍 주식회사 Light unit and display apparatus having the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050066715A (en) * 2003-12-27 2005-06-30 엘지.필립스 엘시디 주식회사 The back light assembly and the method for driving the same
KR20080066876A (en) * 2006-01-10 2008-07-16 로무 가부시키가이샤 Light guiding member and linear light source apparatus using same
KR20090071488A (en) * 2007-12-27 2009-07-01 삼성전기주식회사 Backlight unit for liquid crystal display device
KR20100103736A (en) * 2009-03-10 2010-09-28 엘지이노텍 주식회사 Light unit and display apparatus having the same

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