KR20110132754A - Backlight unit comprising sideview light emitting device package - Google Patents
Backlight unit comprising sideview light emitting device package Download PDFInfo
- Publication number
- KR20110132754A KR20110132754A KR1020100052266A KR20100052266A KR20110132754A KR 20110132754 A KR20110132754 A KR 20110132754A KR 1020100052266 A KR1020100052266 A KR 1020100052266A KR 20100052266 A KR20100052266 A KR 20100052266A KR 20110132754 A KR20110132754 A KR 20110132754A
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- KR
- South Korea
- Prior art keywords
- light emitting
- emitting device
- guide plate
- backlight unit
- device packages
- Prior art date
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means 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
- G02B6/0055—Reflecting element, sheet or layer
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings 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
- G02B6/0073—Light emitting diode [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
- G02B6/009—Positioning aspects of the light source in the package
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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
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
The present invention relates to a backlight unit having a plurality of light emitting device packages, and more particularly, to an edge type backlight unit including side light emitting light emitting device packages that emit light toward a side of a light guide plate.
A light emitting diode is a device that converts electricity into light using characteristics of a compound semiconductor, and has been variously used and developed as a next-generation light source. Such a light emitting diode is very advantageous in terms of color expression and power consumption, and thus is very much attracting attention as a light source that replaces a conventional cold cathode fluorescent lamp (CCFL) used in a backlight unit (BLU) of a notebook computer or a TV.
Backlight unit used in LED TV or LED monitor is largely divided into edge type and direct type. As shown in FIG. 1A, in the direct type backlight unit, tens to hundreds of LED packages 2-1 (shown as three for convenience in FIG. 1A) are arranged in a matrix form on the flat substrate 1-1. And a reflecting sheet 3-1 on the substrate 1-1. Light emitted from the LED packages 2-1 is passed through the diffusion sheet 5-1 and other sheets 6-1, and the LCD panel 6-1 (other sheets and LCD panels is shown as one for convenience). In a straight line toward the light emitting surface of the TV or monitor. There is no light guide plate in the direct backlight unit.
On the other hand, as shown in FIG. 1B, the edge type backlight unit includes a bar type LED module in which a plurality of top view LED packages 2-2 are mounted on a bar substrate 1-2. Since the light is emitted from the LED package, the light emitted from the LED package is vertically bent through the light guide plate 4 to proceed toward the light emitting surface of the LED TV and the monitor. Unlike the direct type, the reflective sheet 3-2 is isolated from the substrate 1-2 and is located below the light guide plate 4.
Edge type backlight units have recently been widely developed because they can reduce the number of LED packages compared to the direct type, which has significant advantages in power consumption and cost. However, in the current edge-type backlight unit, as shown in FIGS. 1B and 1C, a bar-shaped LED module in which a plurality of top-view LED packages are mounted is used. The LED module of the bar is disposed, i) the bad occurrence rate in the process of attaching the bar LED module to the backlight, ii) the bar LED module must be attached to the side of the bar (1-2) of the body of the bar The width of the bezel portion of the LED TV or the LED monitor is wider by the thickness and the height of the top view light emitting diode package 2-2 and the sum of the separation distance between the package 2-2 and the light guide plate (p of FIG. 1C). There are disadvantages to losing. In LED TVs and monitors, the heights of the substrates 1-2 and the package 2-2 are not covered by the bezel of the TV and the monitor because they cannot emit light from the light emitting surface. Since it greatly affects the commercialization of LED TVs and monitors, it can be said to be a major disadvantage of the edge type backlight unit in addition to the defective rate.
The present invention seeks to overcome the disadvantages of the disadvantages of the conventional edge type backlight unit and the limitation of the bezel width by using the novel edge type backlight structure.
In order to solve the above problems, an edge type backlight unit of the present invention comprising a plurality of light emitting device packages and a light guide plate according to an embodiment of the present invention, a flat substrate disposed on the lower portion of the light guide plate, and And a reflective sheet attached between the substrate and the light guide plate, wherein the plurality of light emitting device packages are mounted at edges of the substrate not covered by the reflective sheet to emit light toward the side of the light guide plate. It is characterized in that it is a type (sideview) light emitting device package.
That is, although the light emitting device packages are an edge type disposed at the edge of the backlight unit, a plurality of towers are mounted by using a flat plate substrate mainly used for direct type and side emitting light emitting device packages not used for the edge type at the edge of the substrate. It can be said to be a groundbreaking configuration that is significantly different from the existing edge type backlight unit, in which a bar-shaped LED module in which view type light emitting device packages are mounted sideways and disposed on a side of a light guide plate.
In the present invention, in order for the light emitted from the side-emitting light emitting device packages to be efficiently absorbed into the light guide plate, the separation distance to the light guide plate may be 0.5 mm or less.
In the present invention, the sum of the thickness of the reflective sheet and the thickness of the light guide plate may be 1.0 times to 1.3 times the height of the plurality of side light emitting device packages.
In the present invention, the plurality of side-emitting light emitting device packages may be mounted only at the shorter edges of the long axis edges and the short axis edges of the substrate.
In the present invention, the side length (e) of the plurality of side-emitting light emitting device packages and the separation distance (a) between the light guide plate and the package are
It can be designed to satisfy.In the present invention, the height (d) and the side length (e) of the plurality of side-emitting light emitting device packages
It can be designed to satisfy. This is an optimal condition for stably mounting side light emitting device packages on a flat substrate while reducing bezel thickness of LED TVs and monitors in which a backlight unit is used.In the present invention, the plurality of side-emitting type light emitting device packages may be asymmetric with respect to the horizontal center axis line of the light emitting part of the packages. Specifically, the packages may be designed such that the height d2 below the center line is longer than the height d1 above the center line of the light emitting unit. This is to achieve perfect coupling by perfectly matching the horizontal center axis of the light guide plate and the horizontal center axis of the light emitting part so that the light emitted from the plurality of side light emitting device packages is absorbed by the light guide plate.
The present invention also provides a method of mounting a plurality of side-emitting light emitting device packages only at an edge portion of a substrate, attaching a reflective sheet to the remaining regions of the substrate except for the edge region on which the packages are mounted, and, on the reflective sheet. A method of manufacturing an edge type backlight unit, comprising: disposing a light guide plate; and disposing a diffusion sheet on the light guide plate.
In the mounting step, a plurality of side-emitting light emitting device packages may be mounted only at one of the long axis edges and the short axis edges of the substrate.
In the above manufacturing method, in order for the light emitted from the side-emitting light emitting device packages to be efficiently absorbed into the light guide plate, the separation distance to the light guide plate may be 0.5 mm or less. In addition, the sum of the thickness of the reflective sheet and the thickness of the light guide plate may be 1.0 to 1.3 times the height of the plurality of side light emitting device packages.
In the manufacturing method, the side length (e) of the plurality of side light emitting device packages and the separation distance (a) between the light guide plate and the package are
It can be manufactured to satisfy.The backlight unit according to the present invention uses a bar-shaped LED module by fabricating a backlight unit using a flat substrate and mounting a side view light emitting device package on the edge of the flat substrate despite the edge type as described above. Compared with the conventional method, the bezel width of the LED TV or the LED monitor in which the backlight unit is used may be reduced, and the defect rate in the manufacturing process of the backlight unit and the LED TV may be lowered.
Specifically, the edge type backlight unit according to an embodiment of the present invention has no substrate at the edge portion and the separation distance between the light guide plate and the LED package is also reduced, so that the width of the portion corresponding to the bezel portion of the LED TV and the monitor is remarkably reduced. Decreases. In addition, the edge type backlight unit according to the present invention, the width of the bezel portion should be secured by the height of the top view LED package included in the edge type backlight unit side by side attached to the LED module, the side view LED package Only the side length of (20) corresponds to the bezel portion, and the side length can be designed to be very short, so the width of the bezel portion can be reduced.
In addition, in the conventional edge type backlight unit, various failure rates such as defects caused by adhesives in the process of attaching the bar-shaped LED module to the frame of the backlight unit are considerably high, but the edge type backlight unit according to an embodiment of the present invention Since the backlight unit is manufactured using a flat panel substrate and side view LED packages mounted thereon, a process of attaching the LED module to the frame of the backlight unit is not necessary, and the above defect does not occur.
In addition, the side view LED packages are mounted only at the short and long edges of the flat substrate to reduce the total number of LEDs entering the backlight unit while reducing the distance between the package and the light guide plate (a) and the thickness of the reflective sheet (c). And the sum of the thickness b of the light guide plate b + c is 1.0 to 1.3 times the height of the side-view LED package d, and the height below the center line rather than the height d1 above the center line of the light emitting portion of the packages ( Another design of the present invention is that by designing the longer d2), the light emitted from the LED package is completely absorbed by the light guide plate to optimize the light efficiency of the edge type backlight unit.
1A is a cross-sectional view of a conventional direct backlight unit.
1B is a cross-sectional view of a conventional edge type backlight unit.
1C is a plan view of a portion of a light guide plate that is part of a conventional edge type backlight unit.
2 is a cross-sectional view of a novel edge type backlight unit according to an embodiment of the present invention, showing a right half thereof.
3 is a plan view of a portion of a light guide plate that is part of a novel edge type backlight unit according to an exemplary embodiment of the present invention.
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. However, it is to be understood that the invention may be embodied in different forms than the details set forth herein and is not limited to the following examples.
The same reference numerals are used for the same structures or components (parts) throughout the drawings, and the drawings are schematically illustrated, and the relative dimensions and ratios in the drawings may be somewhat exaggerated or reduced for clarity and convenience. .
Referring now to FIG. 2, there is shown a front view of an edge
FIG. 2 illustrates only the right half of the edge
In FIG. 2, the distance a between the side-
Therefore, the edge
In addition, in the case of the conventional edge type backlight unit (FIGS. 1B and 1C), various defect rates such as defects caused by adhesives during the process of attaching the bar-shaped LED module to the frame of the backlight unit are considerably high, but one embodiment of the present invention The edge
In Figure 2, the side length (e) and the separation distance (a) of the side
In FIG. 2, the sum (b + c) of the thickness c of the
In FIG. 2, the height d and side length e of the side
2, the side
In the edge
3 is a plan view of a part of the
In addition, as shown in FIG. 3, the side view LED packages 20 are mounted only at short edges of the long axis (horizontal direction) and the short axis (vertical direction) of the
Although preferred embodiments of the present invention have been described above, the present invention is not limited thereto and is limited only by the claims, and the present invention is not limited to the technical spirit of the present invention described in the claims in various forms. It will be apparent to those skilled in the art that the present invention may be substituted, changed, and modified by.
Claims (13)
A substrate disposed under the light guide plate;
It further comprises a reflective sheet attached between the substrate and the light guide plate,
And the plurality of light emitting device packages are side emitting light emitting device packages mounted on edge portions of the substrate not covered by the reflective sheet to emit light toward the side of the light guide plate.
The plurality of side light emitting device packages are edge-type backlight unit, characterized in that mounted only on the short edge of the long axis and short axis of the substrate.
An edge type backlight unit, wherein the distance from the plurality of side light emitting device packages to the light guide plate is 0.5 mm or less.
The sum of the thickness of the reflective sheet and the thickness of the light guide plate is an edge type backlight unit, characterized in that 1.0 to 1.3 times the height of the plurality of side light emitting device packages.
Side lengths (e) of the plurality of side-emitting light emitting device packages and the separation distance (a) Edge type backlight unit, characterized in that to satisfy.
Height (d) and side length (e) of the plurality of side-emitting light emitting device packages Edge type backlight unit, characterized in that to satisfy.
The horizontal center axis of the light emitting part of the plurality of side light emitting device packages coincides with the horizontal center axis of the light guide plate, and a package height d2 below the horizontal center axis of the light emitting part is a package height above the horizontal center axis of the light emitting part ( edge type backlight unit, characterized in that it is longer than d1).
Attaching a reflective sheet to the remaining area of the substrate except for the edge portion on which the plurality of side light emitting device packages are mounted; Disposing a light guide plate on the reflective sheet; And disposing a diffusion sheet on the light guide plate.
In the mounting step,
And mounting the plurality of side emitting light emitting device packages only at one of the long axis edges and the short axis edges of the substrate.
And a separation distance from the plurality of side light emitting device packages to the light guide plate is 0.5 mm or less.
And a sum of the thickness of the reflective sheet and the thickness of the light guide plate is 1.0 to 1.3 times the height of the plurality of side light emitting device packages.
Side lengths (e) of the plurality of side-emitting light emitting device packages and the separation distance (a) Edge type backlight unit manufacturing method characterized by satisfying the.
Height (d) and side length (e) of the plurality of side-emitting light emitting device packages Edge type backlight unit manufacturing method characterized by satisfying the.
Priority Applications (1)
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KR1020100052266A KR20110132754A (en) | 2010-06-03 | 2010-06-03 | Backlight unit comprising sideview light emitting device package |
Applications Claiming Priority (1)
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KR1020100052266A KR20110132754A (en) | 2010-06-03 | 2010-06-03 | Backlight unit comprising sideview light emitting device package |
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KR1020100052266A KR20110132754A (en) | 2010-06-03 | 2010-06-03 | Backlight unit comprising sideview light emitting device package |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101413594B1 (en) * | 2012-11-22 | 2014-07-02 | 주식회사 루멘스 | Light emitting device package, backlight unit comprising the same, and method for manufacturing the light emitting device package |
KR101415928B1 (en) * | 2012-11-28 | 2014-07-04 | 주식회사 루멘스 | Lighting device and backlight unit comprising the same |
KR101415930B1 (en) * | 2012-09-17 | 2014-07-04 | 주식회사 루멘스 | light emitting device package and back light unit including the same |
WO2016060472A1 (en) * | 2014-10-17 | 2016-04-21 | 서울반도체 주식회사 | Backlight unit and side view light-emitting diode package |
US10553752B2 (en) | 2015-12-02 | 2020-02-04 | Samsung Electronics Co., Ltd. | Light-emitting device and display device including the same |
-
2010
- 2010-06-03 KR KR1020100052266A patent/KR20110132754A/en not_active Application Discontinuation
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101415930B1 (en) * | 2012-09-17 | 2014-07-04 | 주식회사 루멘스 | light emitting device package and back light unit including the same |
KR101413594B1 (en) * | 2012-11-22 | 2014-07-02 | 주식회사 루멘스 | Light emitting device package, backlight unit comprising the same, and method for manufacturing the light emitting device package |
KR101415928B1 (en) * | 2012-11-28 | 2014-07-04 | 주식회사 루멘스 | Lighting device and backlight unit comprising the same |
WO2016060472A1 (en) * | 2014-10-17 | 2016-04-21 | 서울반도체 주식회사 | Backlight unit and side view light-emitting diode package |
US10553752B2 (en) | 2015-12-02 | 2020-02-04 | Samsung Electronics Co., Ltd. | Light-emitting device and display device including the same |
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