KR20170026883A - Light Emitting Diode Lamp And Liquid Crystal Display Device Including The Same - Google Patents

Abstract

The present invention relates to a light emitting diode lamp including a light absorption material and a liquid crystal display device including the same. A lens of the light emitting diode lamp has the light absorption material which absorbs light between red and green wavelength bands. Accordingly, an overlap area between the red and green wavelength bands of the light emitted from the light emitting diode package of the light emitting diode lamp can be removed. A color reproduction rate of the liquid crystal display device can be improved by implementing pure red and green.

Description

TECHNICAL FIELD [0001] The present invention relates to a light emitting diode (LED) lamp and a liquid crystal display (LCD)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a light emitting diode lamp having a high color gamut including a light absorbing material absorbing light of a specific wavelength and a liquid crystal display including the same.

A liquid crystal display (LCD) device includes a liquid crystal layer formed between two substrates and two substrates, and displays an image by transmitting light by adjusting the arrangement of liquid crystal molecules in the liquid crystal layer.

In general, a liquid crystal display device includes a plurality of pixels arranged in a matrix, and each pixel includes a thin film transistor, a pixel electrode, and a common electrode. By applying voltages to the pixel electrodes and the common electrode of each pixel, an electric field is generated between the pixel electrode and the common electrode, and the liquid crystal molecules of the liquid crystal layer are rearranged by the generated electric field, thereby changing the transmittance of the liquid crystal layer. Therefore, by controlling the voltages applied to the pixel electrodes and the common electrode of the liquid crystal display device, the transmittance of the liquid crystal layer of each pixel can be adjusted so as to have a value corresponding to the video signal, and as a result, the liquid crystal display device displays an image.

Since the liquid crystal display device is not a self-luminous device, it needs to supply light separately. Therefore, the liquid crystal display device includes a liquid crystal panel for displaying an image and a backlight unit for supplying light to the liquid crystal panel.

BACKGROUND ART A backlight unit includes a light source, and a fluorescent lamp such as a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) has been used as a light source of a backlight unit .

The backlight unit can be divided into a direct type and an edge type depending on the path of the light emitted from the lamp. The direct-type backlight unit is a method of directly supplying light emitted from the lamp to the liquid crystal panel by disposing a plurality of lamps under the liquid crystal panel. In the side-type backlight unit, a light guide plate is disposed under the liquid crystal panel, and a lamp is disposed on at least one side of the light guide plate, so that light emitted from the lamp is indirectly supplied to the liquid crystal panel using refraction and reflection of light in the light guide plate.

2. Description of the Related Art In recent years, light emitting diodes (LED) lamps, which have advantages in terms of power consumption, weight, and brightness, have been replaced by fluorescent lamps as light sources of backlight units in accordance with the trend of thinner and lighter weight liquid crystal display devices.

1 is a cross-sectional view schematically showing a liquid crystal display device including a conventional direct-type backlight unit.

1, a conventional liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a main frame 30, a top frame 40, and a bottom frame 50.

The liquid crystal panel 10 includes a lower substrate 12 and an upper substrate 14 and a liquid crystal layer (not shown) is disposed between the two substrates 12 and 14. A lower polarizer 18 is disposed under the lower substrate 12 and an upper polarizer 19 is disposed on the upper substrate 14.

A driving unit (not shown) including a driver integrated circuit (driver IC) is connected to one side of the liquid crystal panel 10 to transmit a signal to a plurality of pixels (not shown) in the liquid crystal panel 10 Supply.

A backlight unit 20 is disposed under the liquid crystal panel 10. The backlight unit 20 includes a reflective sheet 22, a light emitting diode lamp 24, and an optical sheet 26 sequentially arranged from below.

The main frame 30 surrounds the side surfaces of the liquid crystal panel 10 and the backlight unit 20 and the top frame 40 on the front surface of the liquid crystal panel 10 and the bottom frame 50 on the back surface of the backlight unit 20 Thereby forming a module.

However, such a conventional liquid crystal display device has a relatively low color gamut and can not display many colors, so it is difficult to display a high-quality image.

FIG. 2 is a diagram showing the color reproduction ratio of a conventional liquid crystal display device on a CIE 1976 chromaticity distribution diagram, together with a digital cinema initiative (DCI) color standard.

In general, in order to realize a high color reproduction rate, the color reproduction ratio of the display device should have an overlap ratio of 95% or more with respect to the DCI color specification (DCI). However, as shown in Fig. 2, the color reproduction ratio (NCG) of the conventional liquid crystal display device has an area smaller than the DCI color standard (DCI) and the overlap ratio is about 81.0%. Therefore, it is difficult for conventional liquid crystal display devices to realize a high color reproduction rate.

Disclosure of Invention Technical Problem [8] The present invention has been made in order to solve the above problems, and it is an object of the present invention to solve the problem of a low color gamut of a liquid crystal display device.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a liquid crystal panel; and a backlight unit disposed below the liquid crystal panel and including a light emitting diode lamp, The light emitting diode package comprising a blue light emitting diode chip and a yellow and red phosphor, wherein the lens comprises a light absorbent that absorbs light in the wavelength band between red and green.

In this case, the light emitting diode package relatively reduces the intensity of blue light emitted by adjusting the total content and mixing ratio of the yellow and red phosphors, relatively increases the intensity of yellow and red light, and increases the intensity of light emitted from the light emitting diode package By eliminating overlapping areas between the red and green wavelength bands, pure red and green are realized.

In the present invention, the total content and the blending ratio of the yellow and red phosphors in the LED package including the blue chip in the LED lamp are controlled, and the lens of the LED lamp includes the light absorbent absorbing the light in the wavelength band between red and green, It is possible to realize a liquid crystal display device having a high color recall ratio by a simple method.

Since the lens of the LED lamp including such a light absorbing agent can be manufactured at a relatively low cost, an increase in the manufacturing cost of the liquid crystal display device can be minimized, thereby enhancing the price competitiveness.

Further, since the light absorbent is located apart from the LED chip, heat resistance can be improved.

1 is a cross-sectional view schematically showing a liquid crystal display device including a conventional direct-type backlight unit.
2 is a diagram showing a color reproduction ratio of a conventional liquid crystal display device on a CIE 1976 chromaticity distribution diagram.
3 is an exploded perspective view schematically showing a liquid crystal display device according to an embodiment of the present invention.
4 is a cross-sectional view schematically showing a liquid crystal display device according to an embodiment of the present invention.
5 is a cross-sectional view schematically showing the structure of an LED assembly according to an embodiment of the present invention.
6 is a partial perspective view schematically showing the structure of a lens according to an embodiment of the present invention.
7 is a cross-sectional view schematically showing the structure of an LED package according to an embodiment of the present invention.
FIG. 8A is a view showing an emission spectrum of an LED package in an LED lamp of a liquid crystal display according to an embodiment of the present invention, and FIG. 8B is a graph showing the emission spectrum of a light absorbent of a lens in an LED lamp of a liquid crystal display according to an embodiment of the present invention. FIG. 8C is a view showing a spectrum of light emitted from an LED lamp of a liquid crystal display according to an embodiment of the present invention. FIG.
9 is a diagram showing a color reproduction ratio of a liquid crystal display device according to an embodiment of the present invention on a CIE 1976 chromaticity distribution diagram.

A liquid crystal display of the present invention includes a liquid crystal panel and a backlight unit disposed below the liquid crystal panel and including a light emitting diode lamp, the light emitting diode lamp including a light emitting diode package and a lens covering the light emitting diode package The light emitting diode package comprising a first light emitting body having a first peak wavelength, a second light emitting body having a second peak wavelength larger than the first peak wavelength, and a second light emitting body having a third peak wavelength region larger than the second peak wavelength, 3 light emitter, wherein the lens comprises a light absorbing agent having an absorption peak between the second peak wavelength and the third peak wavelength.

The first light emitting body includes a light emitting diode chip, the second light emitting body includes a first phosphor, and the third light emitting body includes a second phosphor.

The weight ratio between the first phosphor and the second phosphor is 55% and 45%, respectively.

Wherein the light emitting diode package further comprises a resin layer, wherein the first phosphor and the second phosphor are located in the resin layer, and the total content of the first phosphor and the second phosphor is 5.8 wt% to be.

The light emitting diode chip is a blue light emitting diode chip, the first phosphor is a yellow phosphor, and the second phosphor is a red phosphor.

The light absorber comprises a metal coordination-tetraazaporphyrin compound of the formula:

The

Wherein M is Ni, Mg, Mn, CO, Cu, Ru, or V, or Mn or Ru coordinated with at least one ligand selected from ammonia, water and halogen atoms, and each of R1, R2, R3, A C1-C10 alkyl group or a C6-C30 aromatic group, and each of a, b, c and d is 1 or 2.

The light emitting diode lamp of the present invention further includes a first light emitting body having a first peak wavelength, a second light emitting body having a second peak wavelength larger than the first peak wavelength, and a third light emitting body having a third peak wavelength And a lens including a light absorbing agent covering the light emitting diode package and having an absorption peak between the second peak wavelength and the third peak wavelength.

Here, the first light emitting body includes a light emitting diode chip, the second light emitting body includes a first phosphor, and the third light emitting body includes a second phosphor.

At this time, the weight mixing ratios of the first phosphor and the second phosphor are 55% and 45%, respectively.

Wherein the light emitting diode package further comprises a resin layer, wherein the first phosphor and the second phosphor are located in the resin layer, and the total content of the first phosphor and the second phosphor is 5.8 wt% to be.

The light emitting diode chip is a blue light emitting diode chip, the first phosphor is a yellow phosphor, and the second phosphor is a red phosphor.

The light absorber comprises a metal coordination-tetraazaporphyrin compound of the formula:

The

Wherein M is Ni, Mg, Mn, CO, Cu, Ru, or V, or Mn or Ru coordinated with at least one ligand selected from ammonia, water and halogen atoms, and each of R1, R2, R3, A C1-C10 alkyl group or a C6-C30 aromatic group, and each of a, b, c and d is 1 or 2.

Hereinafter, a liquid crystal display according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view schematically showing a liquid crystal display device according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view schematically illustrating a liquid crystal display device according to an embodiment of the present invention.

3 and 4, a liquid crystal display device according to an embodiment of the present invention includes a liquid crystal panel 110, a backlight unit 120, a main frame 130, a top frame 140, Frame 150 as shown in FIG.

The liquid crystal panel 110 displays an image and includes a first substrate 112 on the lower side, a second substrate 114 on the upper side, a liquid crystal layer (not shown) positioned between the two substrates 112 and 114, And first and second polarizers 118 and 119 located outside the first substrate 112 and the second substrate 114, respectively.

Although not shown, the first substrate 112 includes a plurality of gate wirings and data wirings on the inner surface, and the gate wirings and the data wirings intersect to define a plurality of pixel regions. A thin film transistor connected to the gate wiring and the data wiring and a pixel electrode connected to the thin film transistor are disposed in each pixel region. This first substrate 112 is referred to as a lower substrate or an array substrate.

Although not shown, the second substrate 114 includes a black matrix and a color filter layer on the inner surface thereof. The black matrix has openings corresponding to the pixel regions, and the red, green, and blue color filter patterns of the color filter layer are sequentially positioned corresponding to the openings of the black matrix. This second substrate 114 is referred to as an upper substrate or a color filter substrate.

On the other hand, a common electrode is formed on the first substrate 112 or the second substrate 114 to form a liquid crystal capacitor together with the pixel electrode and the liquid crystal layer. For example, the common electrode may be formed in the pixel region of the first substrate 114 together with the pixel electrode. In this case, the common electrode and the pixel electrode may be alternately arranged in a pattern of a rod shape or the like.

The first and second polarizers 118 and 119 are attached to the outer surfaces of the first substrate 112 and the second substrate 114 to selectively transmit only specific light. The first polarizing plate 118 and the second polarizing plate 118 transmit only linearly polarized light parallel to the respective light transmission axes and the light transmission axis of the first polarizing plate 118 and the light transmission axis of the second polarizing plate 119 are perpendicular to each other .

A driver integrated circuit (driver IC) 116 is attached to at least one edge of the liquid crystal panel 110 via a connection member such as a tape carrier package (TCP), and the driving integrated circuit 116 Is connected to a printed circuit board (PCB) 117. The printed circuit board 117 is folded in the modularization process and placed on the side of the main frame 130 or the back side of the bottom frame 150.

A backlight unit 120 is disposed below the liquid crystal panel 110 and a backlight unit 120 supplies light to the liquid crystal panel 110. The backlight unit 120 includes a reflective sheet 122, a diffuser plate 124, an optical sheet 126, and a light emitting diode (LED) assembly 128.

The LED assembly 128 is a light source of the backlight unit 120 and includes an LED printed circuit board 128a and an LED lamp 128b.

A plurality of LED printed circuit boards 128a are arranged on the bottom frame 150 and a plurality of LED lamps 128b are mounted on each of the LED printed circuit boards 128a.

The plurality of LED lamps 128b are disposed at regular intervals along the longitudinal direction of the LED printed circuit board 128a. In the drawing, the LED lamps 128b are shown as being arranged in one line, but the LED lamps 128b may be arranged in two or more lines.

The LED lamp 128b according to the embodiment of the present invention emits white light including a blue (B) LED chip, a yellow (Y) phosphor and a red (R) phosphor, and absorbs light in a wavelength band between red and green And a light absorbent, which will be described in detail later.

A reflective sheet 122 is positioned above the exposed LED printed circuit board 128a between adjacent LED lamps 128b. The reflective sheet 122 reflects the light directed downward from the LED lamp 128b toward the liquid crystal panel 110, thereby improving the luminance of the light. The reflective sheet 122 has a hole corresponding to the LED lamp 128b, and the LED lamp 128b is exposed through the hole.

The diffusion plate 124 is spaced apart from the LED assembly 128 and the reflective sheet 122 at a predetermined interval. The diffuser plate 124 uniformly diffuses the light from the LED lamp 128b.

An optical sheet 126 is positioned above the diffuser plate 124. The optical sheet 126 includes a diffusion sheet and at least one light condensing sheet and diffuses or condenses light passing through the diffusion plate 124 to allow a more uniform surface light source to be incident on the liquid crystal panel 110. The optical sheet 126 may include first to third optical sheets 126a, 126b, and 126c that are sequentially disposed on the diffuser plate 124.

In one example, each of the first and second optical sheets 126a and 126b may be a light collecting sheet, and the third optical sheet 126c may be a diffusing sheet. The light condensing sheet may include a prism pattern or a lenticular pattern, the first optical sheet 126a including a lenticular pattern and the second optical sheet 126b including a prism pattern.

On the other hand, the third optical sheet 126c may be a brightness enhancement film. The brightness enhancement film may have a structure in which layers having different refractive indices are alternately laminated.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the main frame 130, the top frame 140, and the bottom frame 150.

The main frame 130 has a square shape and includes a vertical portion and a horizontal portion. The liquid crystal panel 110 is located above the horizontal portion of the main frame 130 and the backlight unit 120 is located below the main frame 130. The vertical portion of the main frame 130 is located on the side of the liquid crystal panel 110 and the backlight unit 120 Lt; / RTI >

The bottom frame 150 includes a horizontal plane and a side plane, and the backlight unit 120 is seated on the horizontal plane. The side surface of the bottom frame 150 surrounds the backlight unit 120 and one end of the side surface may be positioned between the main frame 130 and the backlight unit 120.

The top frame 140 has a rectangular frame shape and has a cross-sectional shape such that it covers the front edge and the side surface of the liquid crystal panel 110. The top frame 140 includes an opening at the center of the front surface so that an image displayed on the liquid crystal panel 110 is displayed on the outside through the opening.

The top frame 140, the main frame 130, and the bottom frame 150 are assembled and fastened to each other, so that the liquid crystal display of the present invention is modularized. At this time, the top frame 140 may be omitted.

Here, the top frame 140 may be referred to as a case top, a top case, or a top cover. The main frame 130 may be referred to as a guide panel or a main support. The bottom frame 150 may be referred to as a cover bottom or a bottom cover I will.

As described above, the LED lamp 128b of the liquid crystal display according to the embodiment of the present invention emits white light including a blue (B) LED chip, a yellow (Y) phosphor, and a red (R) And a light absorber that absorbs light in the wavelength band between red and green. The LED lamp 128b will be described in more detail below.

FIG. 5 is a cross-sectional view schematically showing the structure of an LED assembly according to an embodiment of the present invention, FIG. 6 is a partial perspective view schematically showing a structure of a lens according to an embodiment of the present invention, Sectional view schematically showing the structure of an LED package according to an embodiment.

5, an LED assembly 128 according to an embodiment of the present invention includes an LED printed circuit board 128a and an LED lamp 128b, and the LED lamp 128b includes an LED package 210 And a lens 220.

The LED package 210 is mounted on the upper surface of the LED printed circuit board 128a and the lens 220 is mounted on the LED package 210 to cover the LED package 210. [

The LED printed circuit board 128a applies a voltage to the LED package 210, and the LED package 210 emits light by the applied voltage. Light emitted from the LED package 210 is emitted through the lens 220.

Referring to FIG. 6, the lens 220 has an inner space 222, and the LED package 210 is located in the inner space 222 of the lens 220. The lens 220 has a curved surface of a certain shape on the inner and outer surfaces to diffuse light emitted from the LED package 210. At this time, the LED package 210 is spaced apart from the inner surface of the lens 220.

The lens 220 may be made of poly (methyl methacrylate) (PMMA) or polycarbonate (PC).

The lens 220 includes a light absorbent 220a that absorbs light in a wavelength band between red and green.

The lens 220 may also include a plurality of protrusions 224 at the bottom and the protrusions 224 may be inserted into the LED printed circuit board 128a such that the lens 220 is mounted on the LED printed circuit board 128a Respectively.

7, the LED package 210 according to the embodiment of the present invention includes an LED chip 310, a resin layer 320 including a phosphor (not shown), and a mold frame 330 ).

The LED chip 310 emits blue light and is electrically connected to the LED printed circuit board 128a through wire bonding. Here, the case where the LED package 210 includes a single LED chip 310 is described, but the number of chips is not limited thereto.

The mold frame 330 has a cavity therein, and the LED chip 310 is positioned in the cavity. The LED chip 310 is positioned on the bottom surface of the mold frame 330 corresponding to the cavity and the side surface of the mold frame 330 corresponding to the cavity has the oblique reflecting surface 330a, 310 to the top. Although not shown, the cavity may further include a recess corresponding to the LED chip 310.

Also, though not shown, such a mold frame 330 may include a separate lower frame and an upper frame, and a lead frame may be positioned between the lower frame and the upper frame. The lead frame is connected to the LED chip 310 to apply a voltage to cause recombination of electrons and holes in the LED chip 310.

A resin layer 320 including a phosphor is formed in the cavity to cover the LED chip 510. For example, the phosphor may be dispersed in a silicone resin. Further, the phosphor may include a yellow (Y) phosphor and a red (R) phosphor.

Here, the LED chip 310 has a peak wavelength region of about 444 nanometers (nm), a yellow (Y) phosphor has a peak wavelength region of about 540 nanometers, and a red (R) phosphor has a peak wavelength of about 650 nanometers Peak wavelength region.

The LED package 210 according to the embodiment of the present invention relatively lowers the intensity of the blue light and relatively increases the intensity of the yellow and red light as compared with a general LED package. For this, the total content of the yellow (Y) and red (R) phosphors is preferably about 5.8 wt% of the resin layer 320 content. At this time, the weight mixing ratios of the yellow (Y) phosphor and the red (R) phosphor are preferably 55% and 45%, respectively.

However, in the LED package 210 including the blue LED chip and the yellow and red phosphors, there is an overlapping region between red and green light, and the color reproduction rate of the liquid crystal display device is lowered. Therefore, the LED lamp 128b according to the embodiment of the present invention can increase the color reproduction rate of the liquid crystal display device by allowing the lens 220 to absorb the light in the wavelength band between red and green, including the light absorbent 220a .

At this time, the light absorbing agent 220a may have an absorption peak in the 590 nm wavelength region. For example, the light absorber 220a comprises a metal coordination-tetra-azaporphyrin compound of Formula 1 below.

Formula 1

Wherein M is Ni, Mg, Mn, CO, Cu, Ru, or V, or Mn or Ru coordinated with at least one ligand selected from ammonia, water and halogen atoms. Each of R1, R2, R3 and R4 may be independently selected from C1-C10 alkyl groups or C6-C30 aromatic groups, and each of a, b, c, 1 or 2. < / RTI > For example, the alkyl group may be a methyl, ethyl, propyl, or butyl group, and the aromatic group may be a phenyl group.

The metal coordination-tetraazaporphyrin compound may be included in an amount of 0.2 to 0.8 wt% based on the material of the lens 220.

When the content of the metal coordination-tetraazaporphyrin compound is larger than 0.8 wt%, the intensity of the absorption spectrum in the 590 nm wavelength region increases and the light absorption rate to the 590 nm wavelength region increases. As a result, the color reproduction rate is improved but the luminance is lowered.

On the other hand, when the content of the metal coordination-tetraazaporphyrin compound is less than 0.2 wt%, the intensity of the absorption spectrum in the 590 nm wavelength region decreases and the light absorption rate to the 590 nm wavelength region decreases. Thus, the luminance is increased but the color reproduction rate is lowered.

Here, preferably, the metal coordination-tetraazaporphyrin compound may be contained in an amount of 0.3 to 0.7 wt%, more preferably about 0.5 wt%, based on the binder.

FIG. 8A is a view showing an emission spectrum of an LED package in an LED lamp of a liquid crystal display according to an embodiment of the present invention, and FIG. 8B is a graph showing the emission spectrum of a light absorbent of a lens in an LED lamp of a liquid crystal display according to an embodiment of the present invention. FIG. 8C is a view showing a spectrum of light emitted from an LED lamp of a liquid crystal display according to an embodiment of the present invention. FIG.

8A, the light emitted from the LED package in the LED lamp of the liquid crystal display according to the embodiment of the present invention has a peak wavelength of blue, and an overlapping region exists in the wavelength band between red and green.

On the other hand, as shown in FIG. 8B, the light absorber of the lens in the LED lamp of the liquid crystal display according to the embodiment of the present invention has a strong absorption peak in the wavelength band between red and green.

Therefore, in the case of the light emitted from the LED lamp of the liquid crystal display device according to the embodiment of the present invention, as shown in FIG. 8C, the overlap region of the wavelength band between red and green can be removed by the light absorbing agent, And green.

The color reproduction rate of the liquid crystal display device including such an LED lamp is shown in Fig. FIG. 9 is a diagram showing a color reproduction ratio of a liquid crystal display device according to an embodiment of the present invention on a CIE 1976 chromaticity distribution diagram, and also shows a DCI (digital cinema initiative) color specification.

The CIE 1976 chromaticity distribution diagram is a chromaticity coordinate system proposed to improve the uniformity of the color space of the color space and the color space interval on the coordinate system, which is a disadvantage of the XYZ chromaticity coordinates, and shows the human color perception with u 'and v'. Similar distances on this CIE 1976 chromaticity distribution map represent a similar perceived color difference

As shown in FIG. 9, the color recall ratio (LAS) of the liquid crystal display device including the LED lamp according to the embodiment of the present invention can realize a high color recall ratio with an overlap ratio of DCI color standard (DCI) of 95%.

As described above, the liquid crystal display device including the LED lamp according to the embodiment of the present invention adjusts the total content and blending ratio of the yellow (Y) and red (R) phosphors of the LED package including the blue (B) , And the lens includes a light absorbent that absorbs light in the wavelength band between red and green, thereby realizing high color reproduction at a relatively low cost.

At this time, since the lens is spaced apart from the LED package, it is possible to prevent the light absorbent from being detached from the LED chip, deterioration of the light absorbent due to heat generated from the LED chip, and heat resistance can be ensured.

On the other hand, the white color condition of a liquid crystal display device used for a TV requires a color coordinate of CIE 1931 standard (Wx, Wy) = (0.278, 0.288) and a color temperature of 10,000K. By using the LED lamp according to the embodiment of the present invention The white condition according to the DCI color standard can be satisfied.

In addition, the relative light efficiency of the light emitted from the LED lamp including the light absorbing agent for the light emitted from the LED lamp not including the light absorber is about 70% or more, which is relatively low in luminance, Can be prevented.

Although the liquid crystal display device including the direct-type backlight unit has been described in the foregoing embodiments, the present invention can be applied to the liquid crystal display device including the side-type backlight unit.

That is, the backlight unit includes the light guide plate positioned on the bottom frame (150 in Fig. 3), and the LED lamp 128b including the LED package (210 in Fig. 5) and the lens It can be located at least on one side.

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 appended claims. It can be understood that

110: liquid crystal panel 112: first substrate
114: second substrate 118: first polarizer
119: second polarizer 120: backlight unit
122: reflective sheet 124: diffuser plate
126: optical sheet 128: LED assembly
128a: LED printed circuit board 128b: LED lamp
130: main frame 140: top frame
150: bottom frame 210: LED package
220: lens 220a: light absorbent
310: LED chip 330: mold frame
320: resin layer

Claims (12)

A liquid crystal panel;
A backlight unit disposed below the liquid crystal panel and including a light emitting diode lamp,
/ RTI >
Wherein the light emitting diode lamp includes a light emitting diode package and a lens covering the light emitting diode package,
The light emitting diode package includes a first light emitting body having a first peak wavelength, a second light emitting body having a second peak wavelength larger than the first peak wavelength, and a third light emitting body having a third peak wavelength larger than the second peak wavelength, / RTI >
Wherein the lens comprises a light absorbing agent having an absorption peak between the second peak wavelength and the third peak wavelength.
The method according to claim 1,
Wherein the first light emitting body includes a light emitting diode chip, the second light emitting body includes a first phosphor, and the third light emitting body includes a second phosphor.
3. The method of claim 2,
And the weight ratio between the first phosphor and the second phosphor is 55% and 45%, respectively.
The method of claim 3,
Wherein the light emitting diode package further comprises a resin layer, wherein the first phosphor and the second phosphor are located in the resin layer, and the total content of the first phosphor and the second phosphor is 5.8 wt% .
3. The method of claim 2,
Wherein the light emitting diode chip is a blue light emitting diode chip, the first phosphor is a yellow phosphor, and the second phosphor is a red phosphor.
6. The method according to any one of claims 1 to 5,
Wherein the light absorber comprises a metal coordination-tetraazaporphyrin compound of the formula:
The

Wherein M is Ni, Mg, Mn, CO, Cu, Ru, or V, or Mn or Ru coordinated with at least one ligand selected from ammonia, water and halogen atoms, and each of R1, R2, R3, C10 alkyl group or a C6 to C30 aromatic group, and each of a, b, c, and d is 1 or 2.
A light emitting diode including a first light emitting body having a first peak wavelength, a second light emitting body having a second peak wavelength larger than the first peak wavelength, and a third light emitting body having a third peak wavelength larger than the second peak wavelength, A package;
And a light absorbing agent covering the light emitting diode package and having an absorption peak between the second peak wavelength and the third peak wavelength,
.
8. The method of claim 7,
Wherein the first light emitting body includes a light emitting diode chip, the second light emitting body includes a first phosphor, and the third light emitting body includes a second phosphor.
9. The method of claim 8,
Wherein weight ratio between the first phosphor and the second phosphor is 55% and 45%, respectively.
10. The method of claim 9,
Wherein the light emitting diode package further comprises a resin layer, wherein the first phosphor and the second phosphor are located in the resin layer, and the total content of the first phosphor and the second phosphor is 5.8 wt% Light emitting diode lamp.
9. The method of claim 8,
Wherein the light emitting diode chip is a blue light emitting diode chip, the first phosphor is a yellow phosphor, and the second phosphor is a red phosphor.
12. The method according to any one of claims 7 to 11,
Wherein the light absorber comprises a metal coordination-tetraazaporphyrin compound of the formula:
The

Wherein M is Ni, Mg, Mn, CO, Cu, Ru, or V, or Mn or Ru coordinated with at least one ligand selected from ammonia, water and halogen atoms, and each of R1, R2, R3, C10 alkyl group or C6-C30 aromatic group, and each of a, b, c, and d is 1 or 2.

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