KR20180061882A - Back light unit and liquid crystal display device using the same - Google Patents

Abstract

The present invention provides a backlight unit for preventing the degradation of image quality and a liquid crystal display device including the same. The backlight unit includes a light source mounted on a printed circuit board and a resonance film arranged on the light source and including a resonance material.

Description

BACKLIT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE USING THE SAME [0002]

The present invention relates to a backlight unit and a liquid crystal display including the same.

An active matrix type liquid crystal display device displays a moving image by using a thin film transistor (Thin Film Transistor) as a switching element. This liquid crystal display device is widely used in portable information equipment, office equipment, computers, and televisions. Since such a liquid crystal display device is not a self-luminous device, a backlight unit is provided under the liquid crystal panel to display an image using the light emitted from the backlight unit.

BACKGROUND ART [0002] A backlight unit includes a light source, and a light source has come to use a light emitting diode (LED) in a cold cathode fluorescent lamp (CCFL) according to development of technology. The light emitting diode is widely used as a light source of a liquid crystal display device because it has a longer lifetime, faster response characteristics, lower power consumption and smaller size than conventional fluorescent lamps.

Such a liquid crystal display device including a light source is undergoing research and development in terms of image quality such as high color reproduction. However, the conventional liquid crystal display devices developed to date have limitations in improving the technical aspect due to the characteristics of the light source. For example, in a conventional liquid crystal display device, the half-width of a peak in a light spectrum is wide, so that color reproducibility is deteriorated and image quality is deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a backlight unit and a liquid crystal display device including the backlight unit.

According to an aspect of the present invention, there is provided a backlight unit including a light source mounted on a printed circuit board and a resonance film disposed on the light source, the resonance film including a resonance material, and a liquid crystal display including the same.

The backlight unit and the liquid crystal display device according to an embodiment of the present invention can arrange a resonance film including a resonance material on a light source so that the half width of the peak in the light spectrum can be reduced to emit brighter colors, It is possible to prevent degradation of image quality.

 In addition, in the backlight unit and the liquid crystal display device according to an embodiment of the present invention, the green resonance material is disposed only on the second light source that emits green light, thereby preventing the Rayleigh scattering phenomenon of the first light source emitting the magenta light. have.

Also, the backlight unit and the liquid crystal display device according to an embodiment of the present invention can emit white light by mixing light emitted from the first light source and the second light source, while keeping the thickness of the light guide plate thin.

Further, the backlight unit and the liquid crystal display device according to an exemplary embodiment of the present invention can enhance the image quality by increasing the peak in the optical spectrum and decreasing the half-width by providing the first resonant material and the second resonant material in the resonant film .

The effects obtained in the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description .

1 is a perspective view of a liquid crystal display device according to a first example of the present invention.
2 is an exploded perspective view for explaining a liquid crystal display device according to a first example of the present invention.
FIG. 3 is a cross-sectional view taken along line I-I 'of FIG. 2, and is a cross-sectional view of a liquid crystal display device according to a first example of the present invention.
4 is a schematic cross-sectional view of a liquid crystal display device according to a second example of the present invention.
5 is a schematic cross-sectional view of a liquid crystal display device according to a third example of the present invention.
6 is a graph showing a color reproduction rate of a liquid crystal display device according to a third example of the present invention.
7 is a schematic cross-sectional view of a liquid crystal display device according to a fourth example of the present invention.
8 is a schematic cross-sectional view of a liquid crystal display device according to a fifth example of the present invention.
9 is a schematic cross-sectional view of a liquid crystal display device according to a sixth example of the present invention.
10 is a schematic cross-sectional view of a liquid crystal display device according to a seventh example of the present invention.
11 is a schematic cross-sectional view of a liquid crystal display device according to an eighth example of the present invention.
12 is a schematic cross-sectional view of a liquid crystal display device according to a ninth example of the present invention.

The meaning of the terms described herein should be understood as follows.

The word " first, "" second," and the like, used to distinguish one element from another, are to be understood to include plural representations unless the context clearly dictates otherwise. The scope of the right should not be limited by these terms. It should be understood that the terms "comprises" or "having" does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. It should be understood that the term "at least one" includes all possible combinations from one or more related items. For example, the meaning of "at least one of the first item, the second item and the third item" means not only the first item, the second item or the third item, but also the second item and the second item among the first item, Means any combination of items that can be presented from more than one. The term "on" means not only when a configuration is formed directly on top of another configuration, but also when a third configuration is interposed between these configurations.

Hereinafter, preferred embodiments of a backlight unit and a liquid crystal display including the same according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals are used to denote like elements throughout the drawings, even if they are shown on different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

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

FIG. 1 is an exploded perspective view of a liquid crystal display according to a first example of the present invention, FIG. 2 is an exploded perspective view for explaining a liquid crystal display according to a first example of the present invention, FIG. 3 is a cross- Sectional view of the liquid crystal display device according to the first example of the present invention.

1 to 3, a liquid crystal display (LCD) according to a first example of the present invention includes a lower case 100, a backlight unit (BLU), a panel guide 170, a liquid crystal panel 180, (190), and an upper case (200).

The lower case 100 accommodates the backlight unit BLU and supports the panel guide 170. The lower case 100 is preferably made of a metal material in order to dissipate heat generated from the light source 120.

The backlight unit (BLU) is disposed below the liquid crystal panel 180, and irradiates light to the lower surface of the liquid crystal panel 180. Accordingly, the backlight unit (BLU) is disposed under the liquid crystal panel 180. The backlight unit (BLU) is housed in the lower case (100). The backlight unit BLU according to an exemplary embodiment may include a printed circuit board 110, a light source 120, a reflective member 130, a resonance film 140, a light guide plate 150, and an optical sheet unit 160 .

The printed circuit board 110 is disposed on the lower case 100. The printed circuit board 110 mounts a plurality of light sources 120. The printed circuit board 110 includes a driving power supply line supplied with external driving power, and supplies driving power supplied from the outside through the driving power supply line to each of the plurality of light sources 120, (Not shown). The printed circuit board 110 according to an example includes a bottom surface 110a, an inclined surface 110b, and a supporting surface 110c.

The bottom surface 110a is disposed to face the liquid crystal panel 180. [ The bottom surface 110a is mounted on the upper portion of the light source 120 so that the light source 120 faces the liquid crystal panel 180 and is arranged to emit light.

The inclined surface 110b extends from the bottom surface 110a and forms a side surface of the printed circuit board 110. [ The inclined surface 110b may be obliquely inclined so that light emitted from the light source 120 disposed on the bottom surface 110a may be reflected by the light guide plate 150. [

The support surface 110c is disposed at an edge of the printed circuit board 110. [ The supporting surface 110c extends from the inclined surface 110b and is arranged to face the liquid crystal panel 180. [ The support surface 110c supports the resonance film 140 and the light guide plate 150. [

The plurality of light sources 120 are arranged on the upper surface of the light source PCB 110 so as to be spaced apart from each other and connected to the light source driving signal lines. The plurality of light sources 120 irradiate the lower surface of the light guide plate 150 with light. Each of the plurality of light sources 120 may simultaneously emit light or individually emit light according to the light source driving signal supplied from the light source driving signal. Each of the plurality of light sources 120 may emit light individually according to a local dimming method for partially controlling the luminance.

The light source 120 of the liquid crystal display (LCD) according to the first embodiment of the present invention includes a first light source 121 and a second light source 122 that emit different colors.

The first light source 121 includes a light emitting diode chip and a phosphor. The first light source 121 emits magenta light by the light emitting diode chip and the fluorescent material. The light emitting diode chip emits the first color light, and may emit blue light, for example. The phosphor may emit a second color light. For example, the phosphor may be a fluorescent material that absorbs a part of blue light emitted from the LED chip to emit red light.

The second light source 122 is a chip-scale package and is directly mounted on the upper surface of the printed circuit board 110. The second light source 122 according to the first example of the present invention is a green light emitting diode chip that emits green light. The second light source 122 may include, but is not necessarily, a phosphor.

In the light source 120 according to the first embodiment of the present invention, the magenta light emitted from the first light source 121 and the green light emitted from the second light source 122 are mixed in the light guide plate 150, And can be emitted to the outside. The light source 120 may have a structure such as a lateral chip structure, a flip chip structure, a vertical chip structure, a chip scale package, or the like.

The reflective member 130 is disposed on the printed circuit board 110. The reflective member 130 is made of a reflective material and reflects the light emitted from the light source 120 toward the light guide plate 150. The reflective member 130 according to an example includes a lower surface 130a and a member side surface 130c.

The lower surface 130a is disposed on the bottom surface 110a of the printed circuit board 110. The lower surface 130a reflects downward light from the light source 120 toward the light guide plate 150. At this time, a plurality of light source insertion holes 130b are formed in the lower surface 130a of the reflective member 130. [ A light source 120 mounted on the printed circuit board 110 through the plurality of light source insertion holes 130b may be disposed on the reflective member 130. [

The member side surface 130c extends from the lower surface 130a and is disposed on the inclined surface 110b of the printed circuit board 110. [ The member side surface 130c reflects light, which is directed in the lateral direction, from the light source 120 toward the light guide plate 150. At this time, the member side surface 130c may be extended to the support surface 110c of the printed circuit board 110. [

The film support member (not shown) may be disposed between the plurality of light sources 120, and may be omitted. The film supporting member is disposed between the reflective member 130 and the resonance film 140 to support the resonance film 140 and the light guide plate 150. The edge portions of the resonance film 140 and the light guide plate 150 are supported by the lower case 100 and the printed circuit board 110. However, when the backlight unit BLU and the liquid crystal display (LCD) And the central portion of the light guide plate 150 can be deformed by the load. The film support member is disposed on the reflection member 130 which overlaps the center portion of the resonance film 140 at the same height as the height between the reflection member 130 and the resonance film 140, And supports the light guide plate 150.

The resonance film 140 is disposed between the light source 120 and the light guide plate 150. The resonance film 140 includes a resonance material RM. The resonance material (RM) is a substance that amplifies a weak intensity wavelength to a large intensity. The resonance film 140 including the resonance material RM increases the intensity of light by the resonance material RM when light is incident from the light source 120 and decreases the half width of the peak in the light spectrum. Therefore, the resonance film 140 according to the first example of the present invention can emit brighter colors by reducing the half width of the peak in the light spectrum of the light source 120, And the image quality of the liquid crystal display (LCD) can be prevented from deteriorating.

The resonance film 140 according to the first example of the present invention includes a resonance material RM according to the color of the inefficient light source 120, and includes, for example, a green resonance material RM. In the resonance film 140 according to the first example of the present invention, a green resonance material RM is distributed as a whole. Therefore, both the magenta light emitted from the first light source 121 and the green light emitted from the second light source 122 pass through the resonance film 140 in which the green resonance material RM is distributed.

On the other hand, the green resonance material (RM) causes Rayleigh scattering with respect to magenta light because its size is smaller than the wavelength of magenta light containing blue light and red light. The scattering angle of the Rayleigh scattering is inversely proportional to the fourth square of the wavelength. At this time, the blue light forming the magenta light and the blue light having the shorter wavelength than the red light among the red light are scattered at a larger angle by the green resonance material RM. Thus, the magenta light emitted from the first light source 121 is transmitted through the resonance film 140 containing the green resonance material RM, and is separated into blue light and red light by the Rayleigh scattering. The separated blue light and the red light are mixed with the green light and the white light in the light guide plate 150, which takes a further distance.

The light guide plate 150 is formed in a flat plate shape having a predetermined thickness and is disposed to cover the front surface of the lower case 100. The light guide plate 150 diffuses the light emitted from each of the plurality of light sources 120 and advances the light toward the liquid crystal panel 180. The light guide plate 150 mixes light emitted from the first light source 121 and light emitted from the second light source 122 to emit white light. The light guide plate 150 is disposed apart from the light source 120 by a light diffusion distance (Optical Gap). The light guide plate 150 is supported by the lower case 100 and can be fixed by the panel guide 170.

The optical sheet unit 160 is disposed on the light guide plate 150. The optical sheet unit 160 functions to condense and diffuse the light so that the brightness of the liquid crystal panel 180 is increased, and to advance the light toward the liquid crystal panel 180. At this time, the optical sheet unit 160 may be any one of a prism sheet, a lenticular lens sheet, and a microlens sheet

The prism sheet may include a plurality of prism patterns arranged in parallel so as to have a triangular cross section, and the peak and valley portions of the prism pattern may be rounded with a certain grain.

The lenticular lens sheet may include a plurality of lenticular lens patterns formed in parallel so as to have a semicircular or semi-elliptical cross section having a constant curvature.

The microlens sheet may include a plurality of microlens patterns formed at a constant height so as to have a semicircular or semielliptical shape.

On the other hand, the optical sheet unit 160 may further include a protective sheet for protecting the optical sheet.

The panel guide 170 is disposed in the form of a frame surrounding the side surfaces of the backlight unit BLU and the liquid crystal display (LCD). The panel guide 170 supports the edge portion of the liquid crystal panel 180.

The liquid crystal panel 180 includes a lower substrate 181 and an upper substrate 182 bonded to each other with a liquid crystal layer (not shown) interposed therebetween, a lower polarizing film 183 attached to the rear surface of the lower substrate 181, And an upper polarizer film 184 attached to the front surface of the upper substrate 182.

Although not shown in the drawing, pixels are formed on the lower substrate 181 for every intersection of the gate lines and the data lines. The pixel includes a thin film transistor (TFT), a common electrode, and a pixel electrode.

The thin film transistors serve as switching for transferring and controlling an electrical signal to each pixel. A common voltage for driving the liquid crystal is applied to the common electrode. The pixel electrode is disposed on a protective film covering the common electrode, and is connected to the thin film transistor.

The lower substrate 181 controls the light transmittance of the liquid crystal layer by forming an electric field corresponding to a difference voltage between a data voltage and a common voltage applied to each pixel. A pad portion including a signal applying pad connected to a plurality of data lines is disposed at an edge of the lower substrate 181.

The upper substrate 182 includes a black matrix (BM) and a color filter. In the color filter, R (Red), G (Green), and B (Blue) patterns are formed. The black matrix is disposed between the R, G, and B patterns of the color filter, respectively. A column spacer (CS) for maintaining a cell gap between the upper substrate 182 and the lower substrate 181 may be disposed on the upper substrate 182.

The upper substrate 182 is formed to have a size smaller than the size of the lower substrate 181 to open a pad portion of the lower substrate 181 with a liquid crystal layer (not shown) therebetween, Respectively.

The detailed structure of the lower substrate 181 and the upper substrate 182 may be a driving mode of the liquid crystal layer, for example, a TN (Twisted Nematic) mode, VA (Vertical Alignment) And a Fringe field switching (FFS) mode.

The lower polarizing film 183 is attached to a lower surface of the lower substrate 181 to polarize light incident on the lower substrate 181.

The upper polarizing film 184 is attached to the front surface of the upper substrate 182 and polarizes light emitted to the outside through the upper substrate 182.

The lower polarizing film 183 and the upper polarizing film 184 have different polarizing functions through a stretching process in directions opposite to each other and have contraction forces in directions opposite to each other in accordance with stretching. The lower polarizing film 183 and the upper polarizing film 184 are respectively attached to the lower substrate 181 and the upper substrate 182 so that the contracting forces of the lower polarizing film 183 and the upper polarizing film 184 respectively So that the liquid crystal display panel 170 does not bend upward or downward, but forms a flat state.

The panel driver 190 is connected to a pad unit provided on the lower substrate 181 to drive the pixels of the liquid crystal panel 180 to display a predetermined color image on the liquid crystal panel 180. The panel driver 190 according to an example includes a plurality of circuit films 191 connected to the pad portion of the liquid crystal panel 180, a data driving integrated circuit 193 mounted on each of the plurality of circuit films 191, A printed circuit board 192 for a display coupled to each of the films 191 and a timing control unit 194 mounted on a printed circuit board 192 for a display.

Each of the circuit films 191 is attached between the pad portion of the lower substrate 181 and the printed circuit board 192 for display by a film attaching process and is formed of a tape carrier package (TCP) or a chip on flexible board Chip On Film). Each of the plurality of circuit films 191 may be bent on one side of the liquid crystal panel 180, that is, on the lower side thereof, and disposed on the rear surface of the panel guide 170.

The data driving integrated circuit 193 is mounted on each of the plurality of circuit films 191 and connected to the pad portion through the circuit film 191. [ The data driving integrated circuit 193 receives the pixel data and the data control signal for each pixel supplied from the timing control unit 194 and converts the pixel data for each pixel into an analog data signal in accordance with the data control signal, And supplies it to the corresponding data line.

The display printed circuit board 192 is connected to a plurality of circuit films 191. The display printed circuit board 192 serves to provide a signal necessary for displaying an image to each pixel of the liquid crystal panel 180 to the data driving IC 193 and the gate driving circuit. To this end, various signal wires, various power supply circuits (not shown), memory devices (not shown), and the like are mounted on the printed circuit board 192 for display.

The timing controller 194 is mounted on the printed circuit board 192 for display and outputs digital image data input from the driving system in response to a timing synchronizing signal supplied from an external driving system (not shown) to the liquid crystal panel 180 Generates pixel data for each pixel by arranging the pixel data according to the pixel arrangement structure, and provides the generated pixel data to the data driving IC 193. The timing control unit 194 generates the data control signal and the gate control signal based on the timing synchronization signal, and controls the driving timing of each of the data driving integrated circuit 193 and the gate driving circuit.

In addition, the timing controller 194 may individually control the brightness of each region of the liquid crystal panel 180 by controlling the backlight unit (BLU) through the edge type local dimming technique.

The upper case 200 is disposed in the form of a frame surrounding the backlight unit BLI and the liquid crystal display (LCD). The upper case 200 is coupled to the panel guide 170 to fix the liquid crystal panel 180 supported by the panel guide 170. At this time, the upper case 200 may be coupled to the lower case 100 according to a side coupling method using a fastening member such as a screw or a hook. Therefore, the upper case 200 prevents the front edge portion of the liquid crystal panel 180 and the panel guide 170 from being exposed to the outside of the liquid crystal display device.

As described above, the backlight unit (BLU) and the liquid crystal display (LCD) according to the first example of the present invention can be realized by arranging the resonance film 140 including the resonance material RM on the light source 120, By reducing the half width of the peak, clearer colors can be emitted, thereby enabling high color reproduction and preventing degradation of the image quality of the backlight unit (BLU) and the liquid crystal display (LCD).

4 is a cross-sectional view taken along line I-I 'of FIG. 2, and is a schematic cross-sectional view of a liquid crystal display device according to a second example of the present invention. The liquid crystal display (LCD) shown in FIG. 4 is the same as the liquid crystal display (LCD) according to the first example described in FIGS. 1 to 3 except for the resonance film 140, and is briefly shown. Accordingly, only the resonance film 140 will be described in the following description, and redundant description of the same constitution will be omitted.

Referring to FIG. 4, the resonance film 140 of the liquid crystal display (LCD) according to the second example of the present invention is disposed directly on the second light source 122. The resonance film 140 of the liquid crystal display (LCD) according to the second example of the present invention includes a green resonance material RM and is disposed only on the second light source 122 emitting green light. That is, since the resonance film 140 according to the second example of the present invention is not disposed on the first light source 121 that emits magenta light, the Rayleigh scattering phenomenon does not occur. Accordingly, the resonance film 140 according to the second embodiment of the present invention does not require separation of the magenta light by the green resonance material RM, and thus it does not require a distance to be mixed with the white light in the light guide plate 150.

However, in the resonance film 140 according to the second embodiment of the present invention, the light emitted to the side of the second light source 122 can be irradiated as it is to the light guide plate 150, and the second light source 122, it may take a lot of steps to arrange the resonance film 140 on the small second light source 122.

5 is a cross-sectional view taken along the line I-I 'of FIG. 2, and is a schematic cross-sectional view of a liquid crystal display device according to a third example of the present invention. The liquid crystal display (LCD) shown in FIG. 5 is the same as the liquid crystal display (LCD) according to the first example described with reference to FIGS. 1 to 3 except for the resonance film 140, and is briefly shown. Accordingly, only the resonance film 140 will be described in the following description, and redundant description of the same constitution will be omitted.

5, a resonance film 140 of a liquid crystal display (LCD) according to a third example of the present invention is disposed between a light source 120 and a light guide plate 150, and includes a resonance region 140a and a non- (140b).

The resonance region 140a is a region where the resonance material RM is included in the resonance film 140. FIG. The resonance region 140a is disposed on the second light source 122 and overlaps with the second light source 122. [ The resonance region 140a is sized according to the directivity angle of the light source 120 and the distance d between the light source 120 and the resonance film 140. More specifically, the second light source 122 has a directivity angle of 120 degrees to 140 degrees. The closer the distance d between the second light source 122 and the resonance film 140 is, The directivity angle of the light emitted from the light source 122 toward the resonance film 140 is reduced. Accordingly, the distance d between the second light source 122 and the resonance film 140 may increase as the resonance region 140a increases.

The resonance region 140a of the resonance film 140 according to the third example of the present invention includes a green resonance material RM and is disposed only on the second light source 122 that emits green light. Since the resonance film 140 according to the third example of the present invention is not disposed on the first light source 121 that emits magenta light, the Rayleigh scattering phenomenon does not occur. Accordingly, the resonance film 140 according to the third embodiment of the present invention does not require separation of the magenta light by the green resonance material RM, and thus it does not require a distance to be mixed with white light in the light guide plate 150. [

In the resonance film 140 according to the third example of the present invention, the film may be a localized surface plasmon resonance film. The local surface plasmon resonance phenomenon is a phenomenon in which plasmons do not move when the size of the metal nanocrystals is smaller than the wavelength of the incident wave, and collective oscillation of electrons occurs in the structure. That is, the local surface plasmon resonance film is a film capable of amplifying a selective wavelength. Therefore, the resonance film 140 according to the third example of the present invention can amplify the peak of the second light source 122 by the local surface plasmon resonance phenomenon in the resonance region 140a. At this time, the resonance material RM of the resonance film 140 according to the third example of the present invention may be at least one of Ag, Au, ZrN, and TiN. The Ag may have a bar shape, an octahedral shape, and a polygonal shape, and the Au, ZrN, and TiN may have a sphere shape and a cube shape.

The non-resonance region 140b is the remaining region of the resonance film 140 excluding the resonance region 140a. The non-resonance region 140b does not overlap with the second light source 122, and overlaps with the first light source 121. [ Accordingly, the non-resonance region 140b transmits the light emitted from the first light source 121 and enters the light guide plate 150. [

As described above, the backlight unit (BLU) and the liquid crystal display (LCD) according to the third example of the present invention can be realized by arranging the resonance film 140 including the resonance material RM on the light source 120, It is possible to reduce the half width of the peak and to emit clearer colors, thereby enabling high color reproduction and preventing degradation of the image quality of the backlight unit (BLU) and the liquid crystal display (LCD).

In the backlight unit (BLU) and the liquid crystal display (LCD) according to the third example of the present invention, the green resonance material RM is disposed only on the second light source 122 emitting green light, The Rayleigh scattering phenomenon of the emitting first light source 122 can be prevented. Therefore, the backlight unit BLU and the liquid crystal display device (LCD) according to the third embodiment of the present invention can prevent the light emitted from the first light source 121 and the second light source 122 from being emitted while maintaining the thickness of the light guide plate 150 to be thin. May be mixed to emit white light.

6 is a graph showing a color reproduction rate of a liquid crystal display device according to a third example of the present invention.

FIG. 6 is a graph in which some ranges are enlarged in the graph showing the color region of the DCI standard. Referring to FIG. 6, in the conventional liquid crystal display device, the color gamut of the light source differs greatly from the color gamut of the DCI standard. However, in the liquid crystal display device according to the third example of the present invention, I am. The liquid crystal display according to the third example of the present invention improves the color reproduction rate and increases the color gamut by applying the second light source 122 emitting green light whose half width is decreased.

7 is a cross-sectional view taken along a line I-I 'of FIG. 2, and is a schematic cross-sectional view of a liquid crystal display device according to a fourth example of the present invention. The liquid crystal display (LCD) shown in FIG. 7 is the same as the liquid crystal display (LCD) according to the third example described above with reference to FIG. 5 except for the resonance film 140, and is briefly shown. Accordingly, only the resonance film 140 will be described in the following description, and redundant description of the same constitution will be omitted.

7, a resonance film 140 of a liquid crystal display (LCD) according to a fourth example of the present invention is disposed between a light source 120 and a light guide plate 150, and includes a resonance region 140a and a non- (140b).

The resonance region 140a is a region where the resonance material RM is included in the resonance film 140. FIG. The resonance region 140a is disposed on the second light source 122 and overlaps with the second light source 122. [ The resonant material RM according to the fourth example of the present invention includes a first resonant material 141 and a second resonant material 142. [

The first resonant material 141 is provided inside the resonant film 140 in the resonant region 140a. In the liquid crystal display (LCD) according to the fourth example of the present invention, the first resonant material 141 is made of Ag.

The second resonant material 142 is provided on the resonant film 140 in the resonant region 140a. In the liquid crystal display (LCD) according to the fourth example of the present invention, the second resonant material 142 is made of at least one of Au, ZrN, and TiN.

The local surface plasmon resonance film is characterized in that the resonance material (RM) increases in intensity in spherical or symmetric form, and wider in sharp form. The first resonant material 141 has a bar shape, an octahedral shape, and a polygonal shape, and these shapes have sharp and asymmetric characteristics. Also, the second resonant material 142 has a spherical shape and a cube shape, and has a symmetrical structure. Accordingly, the first resonant material 141 generates an amplification with a lower intensity than the second resonant material 142. [ In the liquid crystal display (LCD) according to the fourth example of the present invention, amplification is primarily performed by the first resonant material 141, and secondarily amplified by the second resonant material 142. The light amplified by the first resonant material 141 is more strongly amplified by the second resonant material 142. [

In the backlight unit BLU and the liquid crystal display (LCD) according to the fourth example of the present invention, the resonance film 140 including the resonance material RM is disposed on the light source 120, The half width of the peak can be reduced to emit brighter colors, thereby enabling high color reproduction and deterioration of image quality.

In the backlight unit BLU and the liquid crystal display (LCD) according to the fourth example of the present invention, the green resonance material RM is disposed only on the second light source 122 emitting green light, The Rayleigh scattering phenomenon of the emitting first light source 122 can be prevented. Therefore, the backlight unit BLU and the liquid crystal display device (LCD) according to the fourth example of the present invention can prevent the light emitted from the first light source 121 and the second light source 122 from being emitted while maintaining the thickness of the light guide plate 150 to be thin. May be mixed to emit white light.

In the backlight unit (BLU) and the liquid crystal display (LCD) according to the fourth example of the present invention, the first resonant material 141 and the second resonant material 142 are provided in the resonant film 140, The light amplified by the resonant material 141 is more strongly amplified by the second resonant material 142. [ Therefore, the backlight unit (BLU) and the liquid crystal display (LCD) according to the fourth example of the present invention can improve the image quality by increasing the peak in the light spectrum and reducing the half width.

8 is a cross-sectional view taken along line I-I 'of FIG. 2, and is a schematic cross-sectional view of a liquid crystal display device according to a fifth example of the present invention. The liquid crystal display (LCD) shown in Fig. 8 is the same as the liquid crystal display (LCD) according to the fourth example described above with reference to Fig. 7 except for the arrangement of the resonance material RM in the resonance film 140, Respectively. Accordingly, only the resonance material RM will be described in the following description, and redundant description of the same constitution will be omitted.

8, a resonance film 140 of a liquid crystal display (LCD) according to a fifth example of the present invention includes a resonance region 140a including a resonance material RM and a resonance region 140b including no resonance material RM Non-resonance region 140b. The resonance material RM provided in the resonance region 140a includes the first resonance material 141 and the second resonance material 142. A resonance film 140 of a liquid crystal display (LCD) according to a fifth example of the present invention has a structure in which a first resonance material 141 is provided on the resonance film 140 and a second resonance material 142 is provided on the resonance film 140, Is provided on top of the material 141. That is, a first resonant material 141 and a second resonant material 142 are sequentially provided between the resonant film 140 and the light guide plate 150. Therefore, in the liquid crystal display (LCD) according to the fifth embodiment of the present invention, the light emitted from the second light source 122 is primarily amplified by the first resonant material 141, and the second resonant material 142 is amplified. And the light is incident on the light guide plate 150. In this case, The light amplified by the first resonant material 141 is more strongly amplified by the second resonant material 142. [

FIG. 9 is a cross-sectional view taken along line I-I 'of FIG. 2, and is a schematic cross-sectional view of a liquid crystal display device according to a sixth example of the present invention. The liquid crystal display (LCD) shown in Fig. 9 is the same as the liquid crystal display (LCD) according to the fourth example described above with reference to Fig. 7 except for the arrangement of the resonance material RM in the resonance film 140, Respectively. Accordingly, only the resonance material RM will be described in the following description, and redundant description of the same constitution will be omitted.

9, a resonance film 140 of a liquid crystal display (LCD) according to a sixth example of the present invention includes a resonance region 140a including a resonance material RM and a resonance region 140b including no resonance material RM Non-resonance region 140b. The resonance material RM provided in the resonance region 140a includes the first resonance material 141 and the second resonance material 142. The resonance film 140 of the liquid crystal display device LCD according to the sixth embodiment of the present invention is such that the first resonance material 141 is provided under the resonance film 140 and the second resonance material 142 is provided under the resonance film 140 140). That is, a resonance film 140 is provided between the first resonant material 141 and the second resonant material 142. Accordingly, in the liquid crystal display (LCD) according to the sixth embodiment of the present invention, the light emitted from the second light source 122 is primarily amplified by the first resonant material 141, and the second resonant material 142 is amplified. And the light is incident on the light guide plate 150. In this case, The light amplified by the first resonant material 141 is more strongly amplified by the second resonant material 142. [

10 is a cross-sectional view taken along line I-I 'of FIG. 2, and is a schematic cross-sectional view of a liquid crystal display device according to a seventh example of the present invention. FIG. 11 is a cross-sectional view taken along line I-I 'of FIG. 2, which is a schematic cross-sectional view of a liquid crystal display device according to an eighth example of the present invention, and FIG. 12 is a schematic view of a liquid crystal display device according to a ninth example of the present invention Sectional view.

The liquid crystal display (LCD) shown in Figs. 10 to 12 is different from the liquid crystal display (LCD) according to the fourth example described above with reference to Fig. 7 except for the arrangement of the resonance material RM in the resonance film 140 And is briefly shown. Accordingly, only the resonance material RM will be described in the following description, and redundant description of the same constitution will be omitted.

10 to 12, the resonance film 140 of the liquid crystal display (LCD) according to the seventh to ninth examples of the present invention includes a resonance region 140a including a resonance material RM, Resonance region 140b that does not include the RM. The resonance material RM provided in the resonance region 140a includes the first resonance material 141 and the second resonance material 142.

The liquid crystal display (LCD) according to the seventh example of the present invention is provided inside the resonance film 140 by mixing the first resonance material 141 and the second resonance material 142. The liquid crystal display (LCD) according to the eighth example of the present invention is provided on the resonance film 140 by mixing the first resonance material 141 and the second resonance material 142. The liquid crystal display (LCD) according to the ninth example of the present invention is provided under the resonance film 140 by mixing the first resonant material 141 and the second resonant material 142.

Therefore, in the liquid crystal display (LCD) according to the seventh to ninth embodiments of the present invention, light emitted from the second light source 122 is primarily amplified by the first resonant material 141, The amplification process is performed at the same time.

The backlight unit (BLU) and the liquid crystal display (LCD) shown in FIGS. 2 to 5 and FIGS. 7 to 12 are the same as those in the first embodiment in which the light source 120 is a direct type However, the present invention is not limited to this, but may be applied to an edge type in which the light source 120 is disposed on one side of the light guide plate 150.

Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, it is to be understood that the present invention is not limited to those embodiments and various changes and modifications may be made without departing from the scope of the present invention. . Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of protection of the present invention should be construed according to the claims, and all technical ideas within the scope of equivalents should be interpreted as being included in the scope of the present invention.

100: lower case 110: printed circuit board
120: light source 130: reflective member
140: resonance film RM: resonance material
140a: resonance region 140b: non-resonance region
141: first resonant material 142: second resonant material
150: light guide plate 160: optical sheet part
170: panel guide 180: liquid crystal panel
190: panel driving part 200: upper case

Claims (10)

Printed circuit board;
A light source mounted on the printed circuit board; And
And a resonance film disposed on the light source and including a resonance material. The method according to claim 1,
Wherein the light source includes a first light source and a second light source that emit light of different colors,
Wherein the resonance film has a resonance region including the resonance material and a non-resonance region not including the resonance material,
Wherein the resonance region is disposed only on the second light source. The method according to claim 1,
Wherein the second light source emits green light, and the first light source emits magenta light. The method of claim 3,
Wherein the printed circuit board includes a support surface at an edge,
Wherein the resonance film is disposed on the support surface,
And the resonance region increases as the distance between the resonance film and the light source increases. The method according to claim 1,
Wherein the resonance film is a localized surface plasmon resonance film. The method according to claim 1,
Wherein the resonant material is at least one of Ag, Au, ZrN, and TiN. The method according to claim 6,
Wherein the Ag has a bar shape, an octahedral shape, and a polygonal shape, and the Au, ZrN, and TiN have a sphere shape and a cube shape. The method according to claim 1,
Wherein the resonant material comprises a first resonant material and a second resonant material,
Wherein the first resonant material is made of Ag, and the second resonant material is at least one of Au, ZrN, and TiN. The method according to claim 1,
Wherein the resonant material comprises a first resonant material and a second resonant material
Wherein the second resonant material is disposed on the first resonant material or mixed with the first resonant material. The backlight unit according to any one of claims 1 to 9,
A lower case having a storage space;
A light guide plate covering the storage space; And
And an optical sheet portion disposed on the light guide plate,
And a liquid crystal panel disposed on the backlight unit.

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