KR20080110250A - Backlight unit and liquid crystal display device having the same - Google Patents

Backlight unit and liquid crystal display device having the same Download PDF

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Publication number
KR20080110250A
KR20080110250A KR1020070058772A KR20070058772A KR20080110250A KR 20080110250 A KR20080110250 A KR 20080110250A KR 1020070058772 A KR1020070058772 A KR 1020070058772A KR 20070058772 A KR20070058772 A KR 20070058772A KR 20080110250 A KR20080110250 A KR 20080110250A
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KR
South Korea
Prior art keywords
light
guide plate
backlight unit
light guide
light diffusion
Prior art date
Application number
KR1020070058772A
Other languages
Korean (ko)
Inventor
이준석
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020070058772A priority Critical patent/KR20080110250A/en
Publication of KR20080110250A publication Critical patent/KR20080110250A/en

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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
    • G02B6/0013—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
    • G02B6/0031—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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in 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
    • G02F1/1335—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)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The present invention discloses a backlight unit and a liquid crystal display device.

According to the present invention, a light diffusion pattern is formed in an incident region corresponding to a light emitting diode of a light guide plate of the backlight unit, so that light having uniform luminance is incident on the entire region of the light guide plate incident portion.

Description

BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

1 is an exploded perspective view illustrating a liquid crystal display according to the present invention.

2 is an enlarged view of a light guide plate and an LED chip region of the present invention.

3 is a view showing a light source distribution of the backlight unit according to the present invention.

4 is an exploded perspective view illustrating a liquid crystal display according to another exemplary embodiment of the present invention.

5 is an enlarged view of a light guide plate and an LED chip area according to another embodiment of the present invention.

6 is a view showing a light source distribution of the backlight unit according to another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: liquid crystal display panel 13: optical sheet

15: Light guide plate 17: Reflector plate

19: Lower cover 16: Printed circuit board

27: LED chip 50: light diffusion pattern

51: scattering pattern 40: reflection pattern

151: slit pattern

The present invention relates to a liquid crystal display device.

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.

However, the backlight unit using the light emitting diode as a light source has a disadvantage in that it does not realize uniform luminance due to the characteristics of the light emitting diode which is a kind of point light source. For example, there is a problem in that different luminance characteristics are exhibited in an incidence region corresponding to a region where a light emitting diode is disposed in a light guide plate of the backlight unit and an incidence region corresponding to a region where no light emitting diodes are disposed. In other words, hot spot defects of higher luminance than other areas occur in the region where light is directly emitted from the light emitting diode.

As described above, non-uniform luminance characteristics in the light guide plate finally cause deterioration of the screen quality of the liquid crystal display device.

According to an embodiment of the present invention, a light diffusion pattern is formed in an incident region corresponding to a light emitting diode of a light guide plate of a backlight unit, so that light having uniform luminance is incident on the entire region of the light guide plate incident portion, and a liquid crystal display having the same. The object is to provide a device.

In addition, the present invention provides a backlight unit having a light reflecting pattern in a light guide plate incident region corresponding to a region in which the light emitting diode is not disposed in the light guide plate of the backlight unit to prevent a decrease in brightness due to light reflection in the light guide plate, and the backlight unit. Another object is to provide one LCD.

In order to achieve the above object, the backlight unit according to the present invention,

Light guide plate;

LED chips disposed in an area corresponding to one side of the light guide plate;

A light diffusion pattern formed on one side of the light guide plate corresponding to the LED chips; And

It includes an optical sheet disposed on the light guide plate.

In addition, the liquid crystal display device according to another embodiment of the present invention,

A liquid crystal display panel; And

Supplying a light source to the liquid crystal display panel, a light guide plate, LED chips disposed in a region corresponding to one side of the light guide plate, a light diffusion pattern formed on one side of the light guide plate corresponding to the LED chips and disposed on the light guide plate It includes; a backlight unit including the optical sheet;

A reflection pattern formed on the light guide plate between the light diffusion patterns is formed.

According to the present invention, a light diffusion pattern is formed in an incident region corresponding to the light emitting diode of the light guide plate of the backlight unit, so that light having uniform luminance can be incident on the entire region of the light guide plate incident portion.

In addition, the present invention forms a reflection pattern in the light guide plate incidence region corresponding to the region in which the light emitting diode is not disposed in the light guide plate of the backlight unit, so as to prevent a decrease in luminance in the reflection pattern formation region by light reflection in the light guide plate. It was.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view showing a liquid crystal display device according to the present invention, Figure 2 is an enlarged view of the light guide plate and the LED region of the present invention.

1 and 2, the liquid crystal display of the present invention includes a liquid crystal display panel 10 and a backlight unit 20 for providing a surface light source to the liquid crystal display panel 10.

The liquid crystal display panel 10 has a structure in which a color filter substrate including RGB color filter layers, and a TFT substrate including a thin film transistor (TFT) and a pixel electrode are bonded to each other with a liquid crystal layer interposed therebetween.

In addition, the backlight unit 20 includes an LED chip 27 composed of red (R), green (G), and blue (B) light emitting diodes (LEDs) or white (W) light emitting diodes (LEDs) (hereinafter, LED). Chip), a printed circuit board 16 having a plurality of power patterns formed thereon to supply power to the LED chip 27, and a light guide plate for converting a light source supplied from the LED chip 27 into a surface light source. (15), a reflecting plate (17) disposed on the back of the light guide plate (15) to improve light efficiency, an optical sheet (13) disposed in front of the light guide plate (15) and condensing and diffusing functions; And a lower cover 19 for accommodating the LED chip 27, the printed circuit board 16, the light guide plate 15, the reflective plate 17, and the optical sheets 13.

In the present invention, a plurality of light diffusion patterns 50 and reflection patterns 40 are formed on one side (light incidence region) of the light guide plate 15 facing the printed circuit board 16 on which the LED chips 27 are disposed. Formed. The light diffusion pattern 50 is formed on one side (light incidence region) of the light guide plate 15 corresponding to the LED chip 27 of the printed circuit board 16 and formed of a plurality of scattering patterns 51. )

The scattering patterns 51 include any one of CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium Phospate, TiO 2, SiO 2, CaCo 3, SnO 2, Mb 2 O 5, ZnO 2, MgF 2, CeO 2, Al 2 O 3, HfO 2, Na 3 LaF 6, and LaF 6. Use one.

For more detailed description, referring to FIG. 2 in which the area A of FIG. 1 is enlarged, a plurality of light diffusion patterns are formed on one side of the light guide plate 30 corresponding to the LED chips 16 formed on the printed circuit board 16. 50 is formed, and the light diffusion pattern 50 is composed of scattering patterns 51 having different diameters. The structure of the scattering pattern 51 can be implemented in a circular, oval or polygonal form. Since the LED chips 16 generate light having a strong luminance in the center region, the scattering pattern 51 has a larger diameter than that of the other regions in the central region of the light diffusion pattern 50 corresponding to the uniform luminance. The light is incident on the light guide plate 30.

 In addition, when using the scattering pattern 51 of the same diameter all to adjust the formation density to have a uniform brightness characteristics. In this case, the scattering patterns 51 have the highest density in the center region of the light diffusion pattern 50 and have relatively low density in both edge regions. In detail, the scattering patterns 51 are formed in the light diffusion pattern 50 region corresponding to the center region of the LED chip 27 to increase the density, and the light diffusion patterns corresponding to both edge regions of the LED chip 27 are formed. In the region of the pattern 50, the number of scattering patterns 51 is relatively reduced to lower the density.

This is because light generated from the LED chip 27 has a high luminance characteristic in the center region and relatively low luminance characteristics at both edges of the LED chip 27. Therefore, when light is incident on one side (light incidence region) of the light guide plate 15, the light diffusion patterns 50 have uniform luminance.

In addition, a reflective pattern 40 is formed between the light diffusion patterns 50 formed at predetermined intervals on one side of the light guide plate 15 so that light incident to the inside of the light guide plate 15 is reflected. The reflection occurs at to minimize luminance deterioration.

3 is a view showing a light source distribution of the backlight unit according to the present invention.

As shown in FIG. 3, the plurality of LED chips 27 mounted on the printed circuit board 16 correspond to the light diffusion pattern 50 formed on one side (light incidence region) of the light guide plate 15. Is placed. The reflective pattern 40 is formed in one side area of the light guide plate 15 corresponding to the area of the printed circuit board 16 on which the LED chips 27 are not disposed. As the method of forming the light diffusion pattern 50 on the light guide plate 15, a method of printing a scattering agent by a printing method may be used.

Therefore, all the light generated from the LED chip 27 proceeds to the light diffusion pattern 27 region, and scattering, reflection, and refraction occur in the light diffusion pattern 27 region so that the LED light has a uniform luminance value. That is, the light generated from the LED chip 27 is pulverized to have more uniform luminance characteristics and incident to the light guide plate 15.

In addition, reflecting patterns 40 are formed in each of the regions except for the light diffusion patterns 50, so that the light leaking from the light guide plate 15 in the lateral direction is reflected back into the light guide plate 15. Therefore, it is possible to minimize the decrease in luminance in the region where the LED chips 27 are not disposed.

Therefore, in the present invention, the light generated from the LED chip 27 has a uniform brightness characteristic in the light diffusion pattern 50 and prevents the brightness characteristic from deteriorating among the LED chips 27. Secondly, the reflection pattern 40 is reflected so that the light guide plate 15 can generate a surface light source having a uniform brightness.

As described above, in the present invention, there is an effect of improving the luminance non-uniformity problem of the conventional LED backlight unit.

4 is an exploded perspective view illustrating a liquid crystal display according to another embodiment of the present invention, and FIG. 5 is an enlarged view of a light guide plate and an LED region according to another embodiment of the present invention.

The same parts as the components of FIG. 1 will be briefly described herein, and will be described in detail with a focus on differentiating parts.

4 and 5, the liquid crystal display of the present invention includes a liquid crystal display panel 110 and a backlight unit 120.

The backlight unit 120 includes an LED chip 127, a printed circuit board 116 on which a plurality of power patterns are formed to supply power to the LED chip 127, the light guide plate 115, and the reflecting plate 117. , The optical sheet 113 and the lower cover 119.

In the present invention, a plurality of light diffusion patterns 150 and reflective patterns 140 are formed on one side (light incidence region) of the light guide plate 115 facing the printed circuit board 116 on which the LED chips 127 are disposed. Formed. The light diffusion pattern 150 is formed on one side (light incidence region) of the light guide plate 115 corresponding to the LED chip 127 of the printed circuit board 116, and is formed of a plurality of slit patterns 151. )

The slit patterns 151 may be any one of scattering agents of CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium phosphate, TiO 2, SiO 2, CaCo 3, SnO 2, Mb 2 O 5, ZnO 2, MgF 2, CeO 2, Al 2 O 3, HfO 2, Na 3 LaF 6, and LaF 6. Use one.

Referring to FIG. 5, in which region B of FIG. 4 is enlarged, a plurality of light diffusion patterns are formed on one side (light incidence region) of the light guide plate 115 corresponding to the LED chips 127 formed on the printed circuit board 116. 150 is formed, and the light diffusion pattern 150 is composed of a plurality of slit patterns 151 having different widths. Since light having high luminance is emitted from the central region of the LED chip 127, slit patterns 151 having a relatively wide width are formed in the central region of the light diffusion pattern 150. Since light having a luminance lower than that of the center region is emitted from both edge regions of the LED chip 127, the slit patterns 151 narrower than the width of the slit pattern 151 formed in the center region of the light diffusion pattern 150 are formed. do. Therefore, the LED light passing through the light diffusion pattern 150 is incident to the light guide plate 115 while having uniform luminance characteristics.

In addition, when the slit patterns 151 having the same width are formed in the light diffusion pattern 150, a relatively large number of slit patterns 151 are formed in the center area of the light diffusion pattern 150 corresponding to the center area of the LED chip 127. The slit patterns 151 were formed to increase the density, and fewer patterns were formed in both edge regions of the light diffusion pattern 150 than the slit patterns 151 formed in the center area, thereby reducing the formation density.

This is because the light generated from the LED chip 127 has a high luminance characteristic in the center region and a relatively low luminance characteristic at both edges of the LED chip 150, so that uniform luminance is generated when light is incident on the light guide plate 115. This is to maintain the characteristics.

In addition, a reflective pattern 140 is formed between the light diffusion patterns 150 formed at predetermined intervals on the side of the light guide plate 115, so that light incident to the inside of the light guide plate 115 is reflected in the reflective pattern 140 region. The reflection was caused to maintain uniform luminance characteristics in the light guide plate 115.

6 is a view showing a light source distribution of the backlight unit according to another embodiment of the present invention.

As shown in FIG. 6, the plurality of LED chips 127 mounted on the printed circuit board 116 may be in contact with the light diffusion pattern 150 formed on one side (light incidence region) of the light guide plate 115. Is placed. The reflective pattern 140 is formed in one side area of the light guide plate 115 corresponding to the area of the printed circuit board 116 where the LED chips 127 are not disposed. The light diffusion pattern 150 is composed of a plurality of slit patterns, and the method of forming the slit patterns on the light guide plate 115 may use a method of printing a scattering agent by a printing method.

Therefore, all light generated from the LED chip 127 proceeds to the light diffusion pattern 127 region, and in the light diffusion pattern 127 region, the LED light is scattered, reflected, and refracted by the slit patterns, thereby providing uniformity. It has a luminance characteristic. That is, the light generated from the LED chip 127 is pulverized to have a more uniform brightness characteristic and incident to the light guide plate 115.

In addition, the reflective patterns 140 are formed in each of the light diffusion patterns 150 except for the region in which the light diffusion patterns 150 are formed, so that the light leaking from the light guide plate 115 in the lateral direction is reflected back into the light guide plate 115. Therefore, it is possible to minimize the decrease in luminance in the region where the LED chips 127 are not disposed.

Therefore, in the present invention, the light generated from the LED chip 127 may have a uniform luminance characteristic in the light diffusion pattern 150 and to prevent the luminance characteristic from deteriorating between the LED chips 127. Secondly, the reflection pattern 140 is reflected to allow the light guide plate 115 to generate a surface light source having a uniform luminance.

As described in detail above, the light diffusion pattern is formed in the incidence region corresponding to the light emitting diode of the light guide plate of the backlight unit, so that light having uniform luminance is incident on the entire incidence portion of the light guide plate.

In addition, the present invention forms a reflection pattern in the light guide plate incidence region corresponding to the region in which the light emitting diode is not disposed in the light guide plate of the backlight unit, so as to prevent a decrease in luminance in the reflection pattern formation region by light reflection in the light guide plate. There is one effect.

The present invention is not limited to the above-described embodiments, and various changes can be made by those skilled in the art without departing from the gist of the present invention as claimed in the following claims.

Claims (15)

Light guide plate; LED chips disposed in an area corresponding to one side of the light guide plate; A light diffusion pattern formed on one side of the light guide plate corresponding to the LED chips; And Back light unit comprising an optical sheet disposed on the light guide plate. The backlight unit of claim 1, further comprising a reflector for reflecting light under the light guide plate. The backlight unit of claim 1, further comprising a reflective pattern formed on the light guide plate between the light diffusion patterns. The backlight unit of claim 1, wherein the light diffusion pattern is formed of a plurality of scattering patterns. The backlight unit of claim 4, wherein the scattering pattern has a circular, elliptical, or polygonal structure. 5. The backlight unit of claim 4, wherein the scattering patterns have the same diameter, are formed densely in the center region of the light diffusion pattern, and are formed in both edge regions. 5. The backlight unit of claim 4, wherein the scattering patterns have different diameters in the center region of the light diffusion pattern and in both edge regions. The backlight unit of claim 7, wherein a diameter of the scattering patterns is large in a central region of the light diffusion pattern and relatively small in both edge regions of the light diffusion pattern. The backlight unit of claim 1, wherein the light diffusion pattern is formed of a plurality of slit patterns. The backlight unit of claim 9, wherein the slit patterns have the same width, are densely formed in the center region of the light diffusion pattern, and are formed in both edge regions. The backlight unit of claim 9, wherein the slit patterns have different widths in the center region of the light diffusion pattern and in both edge regions. The backlight unit of claim 11, wherein the widths of the slit patterns are wide in a central region of the light diffusion pattern and relatively narrow in both edge regions of the light diffusion pattern. The method of claim 4 or 9, wherein the scattering pattern and the slit pattern is CaCO 3 (Calcium carbonate), BaSO 4 , silica, Calcium Phospate, TiO 2, SiO 2, CaCo 3, SnO 2, Mb 2 O 5, ZnO 2, MgF 2, CeO 2, Al 2 O 3, A backlight unit, characterized in that formed with a scattering agent of any one of HfO2, Na3LaF6 and LaF6. The backlight unit of claim 1, wherein the LED chip is comprised of red (R), green (G), and blue (B) LEDs or white (W) LEDs. A liquid crystal display panel; And Supplying a light source to the liquid crystal display panel, a light guide plate, LED chips disposed in a region corresponding to one side of the light guide plate, a light diffusion pattern formed on one side of the light guide plate corresponding to the LED chips and disposed on the light guide plate It includes; a backlight unit including the optical sheet; And a reflective pattern is formed on the light guide plate between the light diffusion patterns.
KR1020070058772A 2007-06-15 2007-06-15 Backlight unit and liquid crystal display device having the same KR20080110250A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101229410B1 (en) * 2010-12-28 2013-02-05 주식회사 프로트 Anti-refletion coating apparatus and method of the same
KR101283055B1 (en) * 2010-11-22 2013-07-05 엘지이노텍 주식회사 Back light unit and display apparatus having the same
CN110066512A (en) * 2018-01-23 2019-07-30 株式会社湃然 The preparation method of antibacterial and heavy metals removal Polyaniline and the Polyaniline prepared by this method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101283055B1 (en) * 2010-11-22 2013-07-05 엘지이노텍 주식회사 Back light unit and display apparatus having the same
KR101229410B1 (en) * 2010-12-28 2013-02-05 주식회사 프로트 Anti-refletion coating apparatus and method of the same
CN110066512A (en) * 2018-01-23 2019-07-30 株式会社湃然 The preparation method of antibacterial and heavy metals removal Polyaniline and the Polyaniline prepared by this method

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