KR20110062498A - Led type backlight unit - Google Patents
Led type backlight unit Download PDFInfo
- Publication number
- KR20110062498A KR20110062498A KR1020090119240A KR20090119240A KR20110062498A KR 20110062498 A KR20110062498 A KR 20110062498A KR 1020090119240 A KR1020090119240 A KR 1020090119240A KR 20090119240 A KR20090119240 A KR 20090119240A KR 20110062498 A KR20110062498 A KR 20110062498A
- Authority
- KR
- South Korea
- Prior art keywords
- light source
- led
- led light
- backlight unit
- printed circuit
- Prior art date
Links
Images
Classifications
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133608—Direct backlight including particular frames or supporting means
-
- 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
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
In the LED type backlight unit (BLU) of the present invention, a plurality of LED light source mounting units are disposed on a surface of a printed circuit board (PCB), and the LED light source is mounted on the downward inclination side of the LED light source mounting unit. Since the light emitted from the light emitting plate may be obliquely incident on the incident surface of the diffuser plate or the light guide plate, the occurrence of luminance smear on the diffuser plate or the light guide plate may be suppressed, and uniform luminance may be provided to the LCD panel.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode (LED) type backlight unit (BLU), and more particularly to an LED light source inclined with respect to a surface of a printed circuit board (PCB). An LED type backlight unit (BLU) is mounted so that light is obliquely incident on an incident surface of a diffusion plate or a light guide plate.
Cold cathode fluorescent lamp (CCFL) has been mainly used as a light emitting unit in the backlight unit (BLU), but LED (LED) is suitable for low power consumption by low voltage operation, and is a thin backlight unit (BLU). As it is environmentally friendly, it is being replaced by cold cathode fluorescent lamps (CCFL). LED type BLU, which adopts LED as a light source, has been mainly adopted in small and medium size LCD monitors and LCD TVs until recently. It is also being applied to large LCD TVs of 40 inches or larger. Such LED type backlight units are classified into a top-emitting type and a side-emitting type.
1 is an exploded perspective view showing a conventional direct-emitting LED type backlight unit. As shown in FIG. 1, in the direct emission type LED
In the direct emission type
Figure 2 is an exploded perspective view showing a conventional side-emitting LED type backlight unit. As shown in FIG. 2, in the side-emitting type
In the side-emitting type
FIG. 3 is a side view of the direct-emitting type
As shown in FIG. 3A, when the distance D1 between the
On the other hand, as shown in FIG. 3B, when the distance D2 between the
FIG. 4 is a side view of the side-emitting LED
As shown in FIG. 4, when the distance D3 between the
In order to solve this problem, the entire luminance
As described above, the LED light source is disposed horizontally on a flat surface of the printed circuit board in the direct emission type or the side emission type LED backlight unit. At present, there is an urgent need for a new method to solve this problem.
Accordingly, it is an object of the present invention to provide an LED type backlight unit to make the luminance uniform.
Another object of the present invention is to provide an LED type backlight unit in which the luminance of the LED light source is inclined to the incident surface of the optical panel to be uniform.
In order to achieve the above object, the LED type backlight unit according to the present invention, a direct-emitting LED type including a printed circuit board, an LED light source arranged on the printed circuit board, a diffusion plate disposed on the LED light source A backlight unit, comprising: a plurality of LED light source mounting portions arranged to protrude upward on the printed circuit board, wherein the LED light source mounting portion has a plurality of downwardly inclined sides, and by mounting the LED light sources on the downwardly inclined sides The light emitted from the LED light source is characterized in that the inclined incident on the incident surface of the diffusion plate.
In addition, the LED type backlight unit according to the present invention for achieving the above object, the side-emitting including a printed circuit board, an LED light source arranged on the printed circuit board, a light guide plate disposed transversely to the LED light source An LED type backlight unit, comprising: a plurality of LED light source mounting portions arranged upwardly protruding on the printed circuit board, wherein the LED light source mounting portion has a plurality of downwardly inclined side surfaces and the LED light source on the downwardly inclined side surfaces. By attaching the light emitted from the LED light source is characterized in that the inclined incident on the incident surface of the light guide plate.
Preferably, the inclined downward side of the LED light source mounting portion can form an inclination angle of 30 degrees to 60 degrees with respect to the surface vertical line of the printed circuit board.
Preferably, the LED light source mounting portion, it may be any one formed integrally with the printed circuit board, or formed in combination with the printed circuit board.
According to the present invention, since the LED light source is mounted on the downward inclined side of the LED light source mounting portion arranged on the printed circuit board, the light emitted from the LED light source is obliquely incident on the incident surface of the diffuser plate or the light guide plate to improve the luminance uniformity of the LED type backlight. It is effective to improve.
Hereinafter, an LED type backlight unit according to the present invention will be described in detail with reference to the accompanying drawings.
5 is an exploded perspective view schematically showing a structure of a direct-emitting LED type backlight unit applied to the LED type backlight unit according to the present invention. The same reference numerals are given to parts having the same configuration and operation as those in FIG.
Referring to FIG. 5, the direct-emitting LED
Here, the LED light
In addition, the side surface of the LED light
In addition, the downwardly
Since the size of the
This is because the median in the horizontal and vertical directions is usually 45 degrees, and it is desirable to have a margin of about 15 degrees at this value.
In addition, the LED light
In addition, on the upper surface of the printed
On the other hand, as shown in the figure, when the LED light
FIG. 6 is a side view of the direct-emitting LED
As shown in FIG. 6, the downwardly
Therefore, the light 52a having the greatest intensity is emitted in a direction 90 degrees with respect to the downwardly
Therefore, the LED
In contrast, conventionally, as shown in FIG. 7, the
Therefore, since the light 12a having the greatest intensity is emitted in a direction perpendicular to the surface of the printed
Therefore, in the conventional LED
On the other hand, in the present invention has been described by applying the LED light source mounted on the down-tilt side of the LED light source mounting portion arranged on the printed circuit board to the LED type backlight unit, the screen of uniform brightness, such as display panel, display board, billboard, signage It can be applied to various required applications. In addition, the backlight with a composite sheet can be applied to indoor and outdoor lighting.
8 is a plan view schematically showing the structure of the side-emitting LED type backlight unit applied to the LED type backlight unit according to the present invention, showing the intensity of the emitted light according to the angle emitted from the LED light source. Parts having the same configuration and operation as those in Fig. 2 are given the same reference numerals. For convenience of explanation, in order to help the description, the diffusion sheet, the light collecting sheet, the protective film, the reflecting plate, and the reflecting sheet are not shown in FIG. 8.
Referring to FIG. 8, the side emitting type LED
The printed
In the side-emitting type
Therefore, the light 62a having the greatest intensity is emitted in a direction 90 degrees with respect to the downwardly
Therefore, the LED
Meanwhile, the present invention has been described in connection with the above-mentioned preferred embodiments, but various substitutions, changes, or modifications are possible without departing from the spirit and scope of the present invention. Therefore, the claims of the present invention should not be limited to the description of the preferred embodiment and the drawings, but should include such substitutions, changes, or modifications belonging to the gist of the present invention.
1 is an exploded perspective view showing a direct-emitting LED type backlight unit applied to a conventional LED type backlight unit.
Figure 2 is an exploded perspective view showing a side emitting type LED type backlight unit applied to a conventional LED type backlight unit.
FIG. 3 is a side view of the direct-emitting LED type backlight unit illustrated in FIG. 1. FIG. 3A illustrates diffusion when the distance between the LED light source and the diffuser is farther than the distance between adjacent LED light sources. FIG. 3B illustrates an example in which luminance spots are generated in the diffuser plate when the distance between the LED light source and the diffuser plate is shorter than a distance between adjacent LED light sources. The figure shown.
FIG. 4 is a side view illustrating the side-emitting type LED backlight unit illustrated in FIG. 2, in which a luminance spot is generated on the light guide plate when the distance between the LED light source and the light guide plate is shorter than the distance between adjacent LED light sources. .
5 is an exploded perspective view schematically showing the structure of a direct-emitting LED type backlight unit of the LED type backlight unit according to the present invention.
FIG. 6 is a side view of the direct-emitting LED type backlight unit illustrated in FIG. 5 and illustrates intensity of emitted light according to an angle emitted from the LED light source.
FIG. 7 is a side view illustrating the direct-emitting LED type backlight unit illustrated in FIG. 1 and illustrates the intensity of emitted light according to the angle emitted from the LED light source.
8 is a plan view schematically showing the structure of the side-emitting LED type backlight unit applied to the LED type backlight unit according to the present invention, showing the intensity of the emitted light according to the angle emitted from the LED light source.
*** Explanation of symbols for the main parts of the drawing ***
10,20,50,60: backlight unit (BLU) 11,21,51,61: printed circuit board
12,22,52,62: LED light source 13: diffuser plate
13a:
15,25: Diffusion sheet
17,17a, 17b, 27,27a, 27b: Condensing sheet
19,29: protective film 23: light guide plate
23a:
23c:
23e: luminance spot
24: Reflector 26: Reflective Sheet
150, 160: LED light source mounting portion
151, 161:
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020090119240A KR20110062498A (en) | 2009-12-03 | 2009-12-03 | Led type backlight unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020090119240A KR20110062498A (en) | 2009-12-03 | 2009-12-03 | Led type backlight unit |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20110062498A true KR20110062498A (en) | 2011-06-10 |
Family
ID=44396669
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020090119240A KR20110062498A (en) | 2009-12-03 | 2009-12-03 | Led type backlight unit |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20110062498A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20130142298A (en) * | 2012-06-19 | 2013-12-30 | 희성전자 주식회사 | Direct type back light unit |
-
2009
- 2009-12-03 KR KR1020090119240A patent/KR20110062498A/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20130142298A (en) * | 2012-06-19 | 2013-12-30 | 희성전자 주식회사 | Direct type back light unit |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8366308B2 (en) | Backlight module | |
CN101097349B (en) | Backlight assembly and liquid crystal display device having the same | |
US8684587B2 (en) | Backlight unit | |
CN101975361B (en) | Side lighting type backlight module | |
JP5509154B2 (en) | Light emitting device and display device | |
CN102518988B (en) | Backlight module | |
KR20080013739A (en) | Liquid crystal display device | |
JP2007066634A (en) | Backlight device, and liquid crystal display device | |
TWI420202B (en) | Edge-type backlight module | |
CN102705744A (en) | Light emitting diode (LED) lamp strip and lateral-entering type backlight module using same | |
KR20130014224A (en) | Backlight unit and display system | |
KR20110064743A (en) | Backlight unit and liquid crystal display device having the same | |
CN101832517B (en) | Back light module | |
US8398286B2 (en) | Backlight module for liquid crystal display | |
JP2012248769A (en) | Light-emitting device and display device | |
WO2012141098A1 (en) | Lighting device and display device | |
WO2012026164A1 (en) | Illumination device and display device | |
US9405149B2 (en) | Direct backlight module | |
KR101255282B1 (en) | prism sheet and back light unit and liquid crystal display device using the same | |
JP5985364B2 (en) | Light source unit and lighting device | |
US8646928B2 (en) | Backlight module and liquid crystal display apparatus | |
JP2009099270A (en) | Hollow surface lighting device | |
JP5203462B2 (en) | Light source module and electronic device including the same | |
KR20110062498A (en) | Led type backlight unit | |
US9823412B2 (en) | Edge type backlight module and liquid crystal display device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
E601 | Decision to refuse application |