KR102047223B1 - Backlight unit using LED and liquid crystal display device including the same - Google Patents
Backlight unit using LED and liquid crystal display device including the same Download PDFInfo
- Publication number
- KR102047223B1 KR102047223B1 KR1020120103514A KR20120103514A KR102047223B1 KR 102047223 B1 KR102047223 B1 KR 102047223B1 KR 1020120103514 A KR1020120103514 A KR 1020120103514A KR 20120103514 A KR20120103514 A KR 20120103514A KR 102047223 B1 KR102047223 B1 KR 102047223B1
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- KR
- South Korea
- Prior art keywords
- thickness
- led
- guide plate
- light guide
- 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
- G02B6/0081—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
- G02B6/0091—Positioning aspects of the light source relative to the light guide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
- F21S2/005—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction of modular construction
-
- 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
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular 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
- 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
-
- 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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
- G02F2201/503—Arrangements improving the resistance to shock
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10106—Light emitting diode [LED]
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The present invention is a light guide plate; An LED having a first thickness and mounted on one surface of the printed circuit board facing the light guide plate; Provided is a backlight unit mounted on one surface of the printed circuit board and including a buffer member having a second thickness greater than the first thickness.
Description
The present invention relates to a backlight unit using an LED, and more particularly, to an LED backlight unit and a liquid crystal display including the same.
Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, have optical anisotropy and polarization characteristics. The principle of image implementation by
Such a liquid crystal display device is an essential component of a liquid crystal panel bonded through a liquid crystal layer between two substrates facing each other, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. .
However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image. Recently, LEDs (light emitting diodes) having high efficiency and high brightness characteristics have been widely used as light sources for liquid crystal displays.
In an edge type liquid crystal display device having an advantage of thinness, an LED backlight disposed along the longitudinal direction of the light incident surface is used in which a plurality of LEDs are spaced apart from the light guide plate. Recently, the LED driving current is increased in terms of high efficiency, and thus the LED temperature is increased, and heat emitted from the LED is transferred to the light guide plate located nearby.
As a result, the light guide plate is thermally expanded to be in contact with the LEDs, thereby causing a poor LED image. In addition, the path of the light incident on the light guide plate is changed by the contact thereof, thereby causing an abnormal light emission phenomenon, and the hot spot phenomenon is intensified by the expansion of the light guide plate, resulting in poor image quality.
As such, the conventional LED backlight has a problem that the reliability is lowered.
The present invention has a problem to provide a method for improving the reliability of the LED backlight.
In order to achieve the above object, the present invention is a light guide plate; An LED having a first thickness and mounted on one surface of the printed circuit board facing the light guide plate; Provided is a backlight unit mounted on one surface of the printed circuit board and including a buffer member having a second thickness greater than the first thickness.
The buffer member may include a base member mounted directly on the printed circuit board; Located on the base member, it may include a support member having a light transmission characteristic.
The base member may have a third thickness, the support member may have a fourth thickness greater than the third thickness, and the base member and the support member may be coupled through an adhesive.
The optical auxiliary mechanism may be disposed between the buffer member and the light guide plate and have a concave lens-shaped recessed portion corresponding to the LED.
The optical aid may be made of a transparent material, or a fluorescent material may be added.
In another aspect, the present invention is a liquid crystal panel; A light guide plate positioned under the liquid crystal panel; An LED having a first thickness and mounted on one surface of the printed circuit board facing the light guide plate; Provided is a liquid crystal display device mounted on one surface of the printed circuit board and including a buffer member having a second thickness greater than the first thickness.
The buffer member may include a base member mounted directly on the printed circuit board; Located on the base member, it may include a support member having a light transmission characteristic.
The base member may have a third thickness, the support member may have a fourth thickness greater than the third thickness, and the base member and the support member may be coupled through an adhesive.
The optical auxiliary mechanism may be disposed between the buffer member and the light guide plate and have a concave lens-shaped recessed portion corresponding to the LED.
The optical aid may be made of a transparent material, or a fluorescent material may be added.
In the present invention, by configuring the buffer member thicker than the LED, the degree of thermal expansion of the light guide plate by the buffer member is limited, the contact between the light guide plate and the LED can be prevented.
Accordingly, defects such as LED imprints can be prevented as mechanical failures caused by contact of the light guide plate and the LEDs. In addition, since the expansion of the light guide plate is limited, the abnormal light emission phenomenon and the hot spot phenomenon are reduced, and thus optical defects can be reduced.
As a result, by using the buffer member, it is possible to reduce the mechanical and optical defects caused by the light guide plate expansion, it is possible to improve the reliability of the LED backlight.
Furthermore, an optical assisting mechanism can be used, in which case light incidence efficiency or color reproduction can be improved.
1 is an exploded perspective view schematically showing a liquid crystal display device including an LED module according to an embodiment of the present invention.
2 is a cross-sectional view schematically showing the LED of FIG.
3 is a cross-sectional view schematically showing an LED module using a buffer member according to an embodiment of the present invention.
4 and 5 are cross-sectional views schematically showing examples of an optical auxiliary mechanism configured between an LED and a light guide plate of a liquid crystal display according to an exemplary embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is an exploded perspective view schematically illustrating a liquid crystal display device including an LED module according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically illustrating the LED of FIG. 1.
Referring to FIG. 1, a liquid
The
The
A thin film transistor (TFT) is formed as a switching element connected to the gate wiring and the data wiring. The thin film transistor is connected to the pixel electrode formed in each pixel.
On the other hand, the
As such, the
As described above, the liquid crystal molecules are arranged in the liquid crystal layer according to the electric field generated by the pixel electrode and the common electrode, thereby displaying an image.
On the other hand, the
Although not shown, polarizers may be attached on the outer surfaces of the first and
The
The
The
Various types of printed circuit boards may be used as the printed circuit board (PCB). For example, a metal core printed circuit board (MCPCB) may be used as a metal PCB having a excellent heat dissipation function using a metal as a base, but is not limited thereto. When MCPCB is used, an insulating layer is formed on a base layer made of a metal material, and a wiring pattern is formed on the insulating layer.
As such, when the MCPCB is used as a printed circuit board (PCB), since the base layer is made of a metal material, it is possible to effectively dissipate heat generated from the
The
The
The
The encapsulation space is preferably configured to have an inverted trapezoidal shape whose width increases along the upper direction, ie, the direction in which light is emitted, but is not limited thereto. Meanwhile, the encapsulation space may have a rectangular shape in plan, but is not limited thereto.
The encapsulation space is filled with the
The
The
The
Here, in order to provide a more efficient surface light source, a pattern having a specific shape may be formed on at least one of the front and rear surfaces of the
The
The
The
The
The
The
Meanwhile, the
Referring to FIG. 3 further, the
The
The
To this end, the
In this way, by configuring the
Accordingly, as a mechanical failure due to the contact between the light guide plate and the
In addition, since the expansion of the
As a result, by using the
The
The
The
The
On the other hand, the
In this regard, since the
On the other hand, in the embodiment of the present invention, as an approach to improve the optical characteristics of the light emitted from the
4 and 5 are cross-sectional views schematically showing examples of an optical auxiliary mechanism configured between an LED and a light guide plate of a liquid crystal display according to an exemplary embodiment of the present invention.
First, referring to FIG. 4, a first optical
As such, by disposing the first optical
Meanwhile, the first
Here, the first optical
As the
As such, by using the first optical
Next, referring to FIG. 5, a second optical
The second
As such, by using the second optical
As described above, according to the embodiment of the present invention, by configuring the buffer member thicker than the LED, the degree of thermal expansion of the light guide plate by the buffer member is limited, the contact between the light guide plate and the LED can be prevented.
Accordingly, defects such as LED imprints can be prevented as mechanical failures caused by contact of the light guide plate and the LEDs. In addition, since the expansion of the light guide plate is limited, the abnormal light emission phenomenon and the hot spot phenomenon are reduced, and thus optical defects can be reduced.
As a result, by using the buffer member, it is possible to reduce the mechanical and optical defects caused by the light guide plate expansion, it is possible to improve the reliability of the LED backlight.
Furthermore, an optical assisting mechanism can be used, in which case light incidence efficiency or color reproduction can be improved.
Embodiment of the present invention described above is an example of the present invention, it is possible to change freely within the scope included in the spirit of the present invention. Accordingly, the invention includes modifications of the invention within the scope of the appended claims and their equivalents.
210: LED 220: buffer member
221: base member 222: support member
PCB: printed circuit board d1 to d4: first to fourth thickness
Claims (11)
An LED having a first thickness and mounted on one surface of the printed circuit board facing the light guide plate;
A buffer member mounted on one surface of the printed circuit board and having a second thickness greater than the first thickness
Including,
The buffer member,
A base member made of a metallic material and directly attached to the printed circuit board through a surface mounting technique and having a third thickness;
Located on the base member, comprising a support member made of a transparent material and having a fourth thickness greater than the third thickness,
And the first thickness of the LED is greater than the third thickness of the base member and less than the fourth thickness of the support member.
The base member and the support member are coupled through an adhesive
Backlight unit.
An optical auxiliary mechanism positioned between the buffer member and the light guide plate and having a concave lens-shaped recessed portion corresponding to the LED;
Backlight unit.
The optical aid is made of a transparent material, or a fluorescent material is added
Backlight unit.
A light guide plate positioned under the liquid crystal panel;
An LED having a first thickness and mounted on one surface of the printed circuit board facing the light guide plate;
A buffer member mounted on one surface of the printed circuit board and having a second thickness greater than the first thickness
Including,
The buffer member,
A base member made of a metallic material and directly attached to the printed circuit board through a surface mounting technique and having a third thickness;
Located on the base member, comprising a support member made of a transparent material and having a fourth thickness greater than the third thickness,
And the first thickness of the LED is greater than the third thickness of the base member and smaller than the fourth thickness of the support member.
The base member and the support member are coupled through an adhesive
LCD display device.
An optical auxiliary mechanism positioned between the buffer member and the light guide plate and having a concave lens-shaped recessed portion corresponding to the LED;
LCD display device.
The optical aid is made of a transparent material, or a fluorescent material is added
LCD display device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020120103514A KR102047223B1 (en) | 2012-09-18 | 2012-09-18 | Backlight unit using LED and liquid crystal display device including the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020120103514A KR102047223B1 (en) | 2012-09-18 | 2012-09-18 | Backlight unit using LED and liquid crystal display device including the same |
Publications (2)
Publication Number | Publication Date |
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KR20140036862A KR20140036862A (en) | 2014-03-26 |
KR102047223B1 true KR102047223B1 (en) | 2019-11-21 |
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KR1020120103514A KR102047223B1 (en) | 2012-09-18 | 2012-09-18 | Backlight unit using LED and liquid crystal display device including the same |
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Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102135738B1 (en) * | 2014-04-02 | 2020-07-20 | 엘지디스플레이 주식회사 | Liquid crystal display device module and method for fabricating the same |
CN106555949B (en) * | 2015-09-23 | 2019-09-10 | 元太科技工业股份有限公司 | Front optical module and display module |
KR102649688B1 (en) | 2016-11-10 | 2024-03-20 | 삼성디스플레이 주식회사 | Backlight unit and liquid crystal display device having the same |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008016433A (en) * | 2006-06-05 | 2008-01-24 | Epson Imaging Devices Corp | Lighting system, liquid crystal device, and electronic apparatus |
WO2011089805A1 (en) * | 2010-01-22 | 2011-07-28 | シャープ株式会社 | Lighting device, display device, and television receiver |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20090003758A (en) * | 2007-07-03 | 2009-01-12 | 주식회사 우영 | Light guide plate, back light unit therewith and liquid crystal display device |
KR101189740B1 (en) * | 2010-06-30 | 2012-10-10 | 엘지이노텍 주식회사 | Backlight unit including quantum dots |
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2012
- 2012-09-18 KR KR1020120103514A patent/KR102047223B1/en active IP Right Grant
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008016433A (en) * | 2006-06-05 | 2008-01-24 | Epson Imaging Devices Corp | Lighting system, liquid crystal device, and electronic apparatus |
WO2011089805A1 (en) * | 2010-01-22 | 2011-07-28 | シャープ株式会社 | Lighting device, display device, and television receiver |
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KR20140036862A (en) | 2014-03-26 |
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