KR20130029560A - Backlight unit and liquid crystal display device having the same - Google Patents
Backlight unit and liquid crystal display device having the same Download PDFInfo
- Publication number
- KR20130029560A KR20130029560A KR1020110092888A KR20110092888A KR20130029560A KR 20130029560 A KR20130029560 A KR 20130029560A KR 1020110092888 A KR1020110092888 A KR 1020110092888A KR 20110092888 A KR20110092888 A KR 20110092888A KR 20130029560 A KR20130029560 A KR 20130029560A
- Authority
- KR
- South Korea
- Prior art keywords
- light emitting
- circuit board
- printed circuit
- light
- liquid crystal
- Prior art date
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Classifications
-
- 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
- G02B6/0085—Means for removing heat created by the light source from the package
-
- 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
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
The present invention relates to a backlight unit and a liquid crystal display device having the same.
Liquid crystal display is a flat panel display that displays images using liquid crystal. It is thin, light, and has low power consumption compared to other display devices. It is used.
Such a liquid crystal display device includes a liquid crystal display panel for displaying an image and a backlight unit for supplying light to the liquid crystal display panel.
The liquid crystal display is classified into an edge type and a direct type according to the shape of the light source. The edge type backlight unit includes a light guide plate on a rear surface of the liquid crystal display panel, and a light source is disposed at a side of the light guide plate to supply a surface light source to the liquid crystal display panel. The direct type backlight unit is applied to a large liquid crystal display device of 12 inches or more, and arranges a plurality of light sources on a rear surface of the liquid crystal display panel, and supplies light emitted from the plurality of light sources to the front liquid crystal display panel.
As the light source of the backlight unit, EL (Electro Luminescence), CCFL (Cold Cathode Fluorescent Lamp), HCFL (Hot Cathode Fluorescent Lamp), and a light emitting diode (LED) are used. Recently, a light emitting diode having excellent light efficiency and high color reproducibility has been used as a light source of a backlight unit. The light source may be a package light source consisting of red, green, and blue light emitting diodes, or a white light emitting diode light source.
The light source using the light emitting diode is formed by forming an insulating film on a metal base substrate, and then forming power wirings on the insulating film, and connecting the lead frame and the power wiring of the light emitting package in which the light emitting diode is mounted.
As such, the metal base substrate on which the light emitting package is formed is disposed at a position corresponding to at least one side surface of the light guide plate. Since the light emitting package is formed on the metal base substrate, the area where the light emitting package is formed is greater than the thickness of the base substrate and the thickness of the light emitting package. Should be
As such, when the space in which the light emitting package is disposed becomes wider, the width of the corresponding bezel area becomes wider, making it difficult to implement a liquid crystal display device having a light and thin shape.
In addition, the heat dissipation of the light emitting package in which the light emitting diodes are mounted is performed through a heat dissipation plate disposed on the rear surface of the base substrate, and there is a distance as much as the thickness of the base substrate between the light emitting package and the heat dissipation plate, which makes it difficult to easily dissipate heat.
As described above, when the heat dissipation characteristics of the light emitting package are lowered, the lifespan of the light emitting diode is shortened and the brightness is lowered.
The present invention, by forming a buried groove in the printed circuit board on which the light emitting package is mounted, and by mounting the light emitting package in the buried groove, it is possible to reduce the light source arrangement area of the backlight unit as much as the thickness of the light emitting package to implement a light and thin shortened It is an object of the present invention to provide a backlight unit and a liquid crystal display device having the same.
In addition, the present invention, by embedding the light emitting package on the printed circuit board, thereby reducing the distance between the light emitting package and the heat sink disposed on the back of the printed circuit board to improve the heat dissipation characteristics and a liquid crystal display device having the same There is another purpose to provide.
The backlight unit of the present invention for solving the above problems of the prior art, the light emitting package for generating light; A printed circuit board having a plurality of buried grooves formed in areas corresponding to the light emitting packages; A first optical sheet and a second optical sheet for condensing and diffusing the light source, and a light guide plate for converting light generated from the light source into a surface light source, wherein the light emitting package is embedded in a buried groove of the printed circuit board, The upper surface of the light emitting package and one side of the printed circuit board may form the same plane.
In addition, the liquid crystal display device of the present invention, a liquid crystal display panel; And a backlight unit for supplying light to the liquid crystal display panel, wherein the backlight unit comprises: light emitting packages generating light; A printed circuit board having a plurality of buried grooves formed in areas corresponding to the light emitting packages; A first optical sheet and a second optical sheet for condensing and diffusing the light source, and a light guide plate for converting light generated from the light source into a surface light source, wherein the light emitting package is embedded in a buried groove of the printed circuit board, The upper surface of the light emitting package and one side of the printed circuit board may form the same plane.
According to the present invention, by forming a buried groove in a printed circuit board on which the light emitting package is mounted, and mounting the light emitting package in the buried groove, the light source arrangement area of the backlight unit as much as the thickness of the light emitting package can be reduced, thereby achieving light and short reduction. There is.
In addition, the present invention has the effect of improving the heat dissipation characteristics by reducing the distance between the light emitting package and the heat sink disposed on the back of the printed circuit board by embedding the light emitting package on the printed circuit board.
1 is an exploded perspective view of a liquid crystal display according to the present invention.
2 is a view illustrating a printed circuit board on which light emitting packages are mounted in the backlight unit of the present invention.
3 is a cross-sectional view taken along line II-II ′ of FIG. 2.
4 is an assembled cross-sectional view taken along the line II ′ of FIG. 1.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are provided by way of example so that those skilled in the art can fully understand the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 is an exploded perspective view of a liquid crystal display according to the present invention, and FIG. 4 is an assembled cross-sectional view taken along the line II ′ of FIG. 1.
1 and 4, the liquid crystal display of the present invention includes a liquid
The liquid
A gate driving circuit (not shown) for supplying a scan signal to a gate line and a data driving circuit (not shown) for supplying a data signal to a data line are provided at an edge of the liquid
The gate and data driving circuit are electrically connected to the liquid
In addition, the
Here, the first
The liquid
The printed
Therefore, in the present invention, the light source generating region of the
That is, in the prior art, the
In addition, in the present invention, since the
As a result, the bezel width d2 disposed to block light leakage generated along the edge of the conventional liquid
In addition, since the
According to the present invention, by forming a buried groove in the printed circuit board on which the light emitting package is mounted, and mounting the light emitting package in the buried groove, the light source arrangement area of the backlight unit as much as the thickness of the light emitting package can be reduced, thereby achieving a light and thin shortening. There is.
2 is a view illustrating a printed circuit board on which light emitting packages are mounted in the backlight unit of the present invention, and FIG. 3 is a cross-sectional view taken along the line II-II 'of FIG. 2.
2 and 3, the
That is, the upper surface of the
The
In addition, a first
The printed
In the present invention, a plurality of buried grooves are formed on the printed
The method of forming the buried groove on the printed
As shown in the drawing, the buried depth of the printed
According to the present invention, by forming a buried groove in a printed circuit board on which the light emitting package is mounted, and mounting the light emitting package in the buried groove, the light source arrangement area of the backlight unit as much as the thickness of the light emitting package can be reduced, thereby achieving light and short reduction. There is.
In addition, the present invention has the effect of improving the heat dissipation characteristics by reducing the distance between the light emitting package and the heat sink disposed on the back of the printed circuit board by embedding the light emitting package on the printed circuit board.
110: liquid crystal display panel 120: backlight unit
115: support main 150: light emitting package
151: printed circuit board 131: first optical sheet
132: second optical sheet 261: light emitting diode
260: month 224: mold layer
300: solder 210: power wiring
Claims (7)
A printed circuit board having a plurality of buried grooves formed in areas corresponding to the light emitting packages;
A first optical sheet and a second optical sheet for condensing and diffusing the light source;
It includes a light guide plate for converting the light generated from the light source into a surface light source,
And the light emitting package is embedded in the recess of the printed circuit board, and the upper surface of the light emitting package and one side of the printed circuit board form the same plane.
It includes a backlight unit for supplying light to the liquid crystal display panel,
The backlight unit includes:
Light emitting packages for generating light;
A printed circuit board having a plurality of buried grooves formed in areas corresponding to the light emitting packages;
A first optical sheet and a second optical sheet for condensing and diffusing the light source;
It includes a light guide plate for converting the light generated from the light source into a surface light source,
And the light emitting package is embedded in the recess of the printed circuit board, and an upper surface of the light emitting package and one side of the printed circuit board form the same plane.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110092888A KR20130029560A (en) | 2011-09-15 | 2011-09-15 | Backlight unit and liquid crystal display device having the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110092888A KR20130029560A (en) | 2011-09-15 | 2011-09-15 | Backlight unit and liquid crystal display device having the same |
Publications (1)
Publication Number | Publication Date |
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KR20130029560A true KR20130029560A (en) | 2013-03-25 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020110092888A KR20130029560A (en) | 2011-09-15 | 2011-09-15 | Backlight unit and liquid crystal display device having the same |
Country Status (1)
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KR (1) | KR20130029560A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107632459A (en) * | 2017-10-13 | 2018-01-26 | 惠州市华星光电技术有限公司 | Liquid crystal display and its backlight module |
-
2011
- 2011-09-15 KR KR1020110092888A patent/KR20130029560A/en active Search and Examination
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107632459A (en) * | 2017-10-13 | 2018-01-26 | 惠州市华星光电技术有限公司 | Liquid crystal display and its backlight module |
WO2019071700A1 (en) * | 2017-10-13 | 2019-04-18 | 惠州市华星光电技术有限公司 | Liquid crystal display and backlight module thereof |
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