KR101323516B1 - Backlight unit and liquid crystal display device having the same - Google Patents
Backlight unit and liquid crystal display device having the same Download PDFInfo
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- KR101323516B1 KR101323516B1 KR1020060136166A KR20060136166A KR101323516B1 KR 101323516 B1 KR101323516 B1 KR 101323516B1 KR 1020060136166 A KR1020060136166 A KR 1020060136166A KR 20060136166 A KR20060136166 A KR 20060136166A KR 101323516 B1 KR101323516 B1 KR 101323516B1
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- light
- light emitting
- emitting diode
- emitting diodes
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Abstract
Disclosed is a backlight unit capable of preventing color separation and realizing uniform white light.
The backlight unit according to the present invention includes a plurality of light source packages each having first to third light emitting diodes for generating light of different colors and arranged in a planar manner, wherein each of the light source packages includes first to third light sources. The third light emitting diodes may be installed to be rotated in different directions (or positions) of the first to third light emitting diodes of the adjacent light source package.
Light-emitting diode, symmetry
Description
1 is a view showing a direct type backlight unit using a conventional light emitting diode.
2 shows a backlight unit according to the invention;
3 is a plan view illustrating a light emitting diode package of FIG. 2 arranged on a reflector.
4 is a detailed view of portion A of FIG.
BRIEF DESCRIPTION OF THE DRAWINGS FIG.
110: light emitting diode unit 111: bottom case
114: light emitting diode package
114a to 114i: first to ninth light emitting diode packages
115a to 115c: optical sheet 116: printed circuit board
117: Reflective plate 118: cap
122, 126, and 130: first to third light emitting diodes
The present invention relates to a backlight unit, and more particularly, to a backlight unit capable of preventing color separation and realizing uniform white light and a liquid crystal display device having the same.
In general, a liquid crystal display (LCD) is a liquid crystal panel including a plurality of liquid crystal cells arranged in a matrix and a plurality of control switches for switching a video signal to be supplied to each of the liquid crystal cells. As a result, the amount of light transmitted from the backlight unit is adjusted to display a desired image on the screen.
The backlight unit includes a direct light type for irradiating the liquid crystal panel with light from a plurality of light sources disposed directly below the liquid crystal display device, and a light guide panel (LGP) according to the arrangement of the light sources. It can be broadly classified into an edge light type for transmitting light from a light source provided on the side wall to the liquid crystal panel. Cold edge fluorescent lamps (CCFL: Cold Cathode Fluorescent Lamps) are generally used as the light source in the edge light type and direct light type backlight units. Its low refresh rate makes it unsuitable for high definition and high resolution TVs and monitors.
Recently, a light emitting diode (LED) is spotlighted as a light source to replace the cold cathode fluorescent lamp (CCFL). In addition, the backlight unit is in the trend of miniaturization, thinness, and light weight. In accordance with the above trend, light emitting diodes (LEDs), which are advantageous in terms of power consumption, weight, and brightness, have been proposed instead of fluorescent lamps used in backlight units.
The light emitting diode is disposed on a printed circuit board in the form of a package consisting of red, green and blue light emitting diodes, and a cap surrounding the red, green and blue light emitting diodes to generate light.
The backlight unit using the light emitting diode turns on the light emitting diode package when the image is implemented in the liquid crystal panel in which the image is displayed. When voltage is applied to the red, green, and blue three-color light emitting diodes of the light emitting diode package, the emitted red, green, and blue light are totally reflected inside the cap several times through the cap of the light emitting diode package. Mixed with each other.
In this case, the cap is formed of a transparent material, for example, may be composed of a lens. The red, green, and blue light generated in the red, green, and blue light emitting diodes of the light emitting diode package are mixed to form uniform white light. As such, the white light generated by the LED package is irradiated onto the liquid crystal panel to display an image on the liquid crystal panel.
1 is a view schematically showing a conventional light emitting diode unit.
As shown in FIG. 1, the conventional light
The red, green, and blue
Meanwhile, as the red, green, and blue
An object of the present invention is to provide a backlight unit capable of preventing color separation and a liquid crystal display device having the same.
It is an object of the present invention to provide a backlight unit capable of realizing uniform white light and a liquid crystal display device having the same.
A backlight unit according to the present invention for achieving the above object is a reflecting plate for reflecting light; And a plurality of light source packages formed on the reflector and having first to third light emitting diodes respectively generating light of different colors, and arranged in a planar manner, wherein the light source packages are light sources positioned at the center of the reflector. The first to third light emitting diodes of the light source packages are symmetrically positioned up, down, left and right with respect to the package.
According to an aspect of the present invention, a liquid crystal display device includes: a reflector reflecting light; And a backlight unit including a plurality of light source packages formed on the reflecting plate and having first to third light emitting diodes respectively generating light of different colors and arranged in a plane. And a liquid crystal panel to display an image by irradiating light generated from the plurality of light source packages, wherein the light source packages are first to third light emitting diodes of the light source packages based on the light source package positioned at the center of the reflector. They are symmetrically positioned up, down, left and right.
Hereinafter, embodiments according to the present invention will be described with reference to the accompanying drawings.
2 is a view showing a backlight unit according to the present invention.
As shown in FIG. 2, the backlight unit according to the present invention is configured to fix and support the light
The light
A detailed description of the light
In addition, the backlight unit according to the present invention is positioned between the
Light generated from the light
3 is a plan view illustrating a light emitting diode package of FIG. 2 arranged on a reflector.
As illustrated in FIGS. 2 and 3, a plurality of light
FIG. 4 is a view showing portion A of FIG. 3 in detail.
As shown in FIG. 3 and FIG. 4, a plurality of light
The first to third
The arrangement of the
Green, blue, and red light emitted from the first to third
For example, when the medium between the light emitting
As described above, the arrangement form of the first to third
The
Further, first to third light emission formed in each of the fourth and sixth light emitting
As described above, the plurality of light emitting
The first, second, and third
By arranging the first to third
In addition, the plurality of light emitting
As described above, the backlight unit according to the present invention is color-mixed in different directions by arranging the first to third light emitting diodes so as to be symmetric up / down, left / right with respect to the center of the screen portion where the image is displayed. White light is emitted from various directions to prevent color separation.
As the color separation is prevented, the backlight unit according to the present invention generates uniform white light, thereby improving light efficiency and color reproducibility.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims. .
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020060136166A KR101323516B1 (en) | 2006-12-28 | 2006-12-28 | Backlight unit and liquid crystal display device having the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020060136166A KR101323516B1 (en) | 2006-12-28 | 2006-12-28 | Backlight unit and liquid crystal display device having the same |
Publications (2)
Publication Number | Publication Date |
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KR20080061171A KR20080061171A (en) | 2008-07-02 |
KR101323516B1 true KR101323516B1 (en) | 2013-10-29 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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KR1020060136166A KR101323516B1 (en) | 2006-12-28 | 2006-12-28 | Backlight unit and liquid crystal display device having the same |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH113051A (en) * | 1997-04-14 | 1999-01-06 | Nichia Chem Ind Ltd | Led display and display device using it |
US20050001537A1 (en) * | 2003-03-28 | 2005-01-06 | Lumileds Lighting U.S., Llc | Multi-colored LED array with improved brightness profile and color uniformity |
JP2006258973A (en) * | 2005-03-15 | 2006-09-28 | Sony Corp | Back-light device and liquid crystal display device |
KR20080037167A (en) * | 2006-10-25 | 2008-04-30 | 삼성전자주식회사 | Liquid crystal display device and driving method of the same |
-
2006
- 2006-12-28 KR KR1020060136166A patent/KR101323516B1/en active IP Right Grant
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH113051A (en) * | 1997-04-14 | 1999-01-06 | Nichia Chem Ind Ltd | Led display and display device using it |
US20050001537A1 (en) * | 2003-03-28 | 2005-01-06 | Lumileds Lighting U.S., Llc | Multi-colored LED array with improved brightness profile and color uniformity |
JP2006258973A (en) * | 2005-03-15 | 2006-09-28 | Sony Corp | Back-light device and liquid crystal display device |
KR20080037167A (en) * | 2006-10-25 | 2008-04-30 | 삼성전자주식회사 | Liquid crystal display device and driving method of the same |
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KR20080061171A (en) | 2008-07-02 |
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