KR20130010383A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided to improve brightness by directly receiving the light transformed by a light guide plate. CONSTITUTION: A display device includes a display panel, a light guide plate(200), a light source(300) and a wavelength conversion portion(400). The light guide plate is arranged under the display panel. The light source is arranged in the side of the light guide plate. The wavelength converter is arranged in the inner side of the groove(210) formed in the side of the light guide plate.

Description

Display device {DISPLAY DEVICE}

The embodiment relates to a display device.

Recently, a flat panel display such as a liquid crystal display (LCD), a plasma display panel (PDP), or an organic light emitting diode (OLED) has been developed in place of the conventional CRT.

The liquid crystal display device includes a thin film transistor substrate, a color filter substrate, and a liquid crystal display panel in which liquid crystal is injected between both substrates. Since the liquid crystal display panel is a non-light emitting device, a backlight unit for supplying light to the bottom surface of the thin film transistor substrate is positioned. Light transmitted from the backlight unit is adjusted according to the arrangement of liquid crystals.

The backlight unit is divided into edge type and direct type according to the position of the light source. The edge type is a structure in which a light source is provided on a side surface of the light guide plate.

The direct type is a structure that is mainly developed with the size of a liquid crystal display device being enlarged. One or more light sources are arranged on the lower surface of the liquid crystal display panel to supply light to the liquid crystal display panel.

The direct-type backlight unit has advantages in that it can utilize a larger number of light sources than the edge-type backlight unit and can secure a high luminance, but has a disadvantage that the thickness becomes thicker than the edge type in order to ensure uniformity of brightness have.

In order to overcome this problem, a quantum dot bar in which a plurality of quantum dots dispersed in a red wavelength or a green wavelength is dispersed is provided in front of a blue LED emitting blue light constituting a backlight unit, Thus, light mixed with blue light, red light and green light by a plurality of quantum dots dispersed in the quantum dot bar is incident on the light guide plate to provide white light.

At this time, when white light is provided to the light guide plate using the quantum dot bar, high color reproduction can be realized.

The backlight unit may include an FPCB (Flexible Printed Circuits Board) for transmitting and supplying LEDs and signals to one side of a blue LED emitting blue light, and an adhesive member may be further provided on the lower surface of the FPCB.

As such, when a light emitted from a blue LED is leaked, a display device for displaying an image in various forms using white light provided to the light guide plate through the quantum dot bar is widely used.

A display device to which such a quantum dot is applied is disclosed in Korean Patent Laid-Open Publication No. 10-2011-0068110.

Embodiments provide an display device having improved optical characteristics and which can be easily manufactured.

In one embodiment, a display device includes: a display panel; A light guide plate disposed under the display panel; A light source disposed on a side of the light guide plate; And a wavelength converter disposed inside the groove formed on the side surface of the light guide plate.

In one embodiment, a display device includes: a display panel; A light guide plate disposed under the display panel; A plurality of light sources disposed on side surfaces of the light guide plate; And a plurality of wavelength converters formed on side surfaces of the light guide plate and disposed in grooves corresponding to the light sources, respectively.

In the display device according to the exemplary embodiment, the wavelength converter is disposed inside the groove formed on the side surface of the light guide plate. Accordingly, since the converted light is directly incident on the light guide plate, the display device according to the embodiment may minimize light loss and have improved luminance.

In addition, the wavelength converter is formed directly in the light guide plate, and thus does not require an additional member. Accordingly, the display device according to the embodiment can be easily manufactured at low cost.

In addition, the wavelength converter may be disposed deeper in the groove formed on the side surface of the light guide plate irrespective of the distance between the light source and the light guide plate. That is, as the depth of the groove becomes deeper, the path of the light passing through the wavelength converter may be longer.

Accordingly, the wavelength converter may effectively convert incident light. Thus, the display device according to the embodiment can have improved color reproducibility.

1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment.
2 is a perspective view illustrating a light emitting diode, a light guide plate, and a wavelength converter according to the first embodiment.
3 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter.
4 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter according to a second embodiment.
5 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter according to a third embodiment.
6 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter according to a fourth embodiment.
FIG. 7 is a cross-sectional view of a light emitting diode, a light guide plate, a light collecting unit, and a wavelength converting unit according to a fifth embodiment.
8 is an exploded perspective view illustrating a liquid crystal display according to a sixth embodiment.
9 is a perspective view illustrating a light emitting diode, a light guide plate, and a wavelength converter according to a sixth embodiment.

In the description of the embodiments, it is described that each substrate, frame, sheet, layer or pattern is formed "on" or "under" each substrate, frame, sheet, In this case, "on" and "under " all include being formed either directly or indirectly through another element. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment. 2 is a perspective view illustrating a light emitting diode, a light guide plate, and a wavelength converter according to the first embodiment. 3 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter.

1 to 3, the liquid crystal display according to the embodiment includes a backlight unit 10 and a liquid crystal panel 20.

The backlight unit 10 emits light to the liquid crystal panel 20. The backlight unit 10 may irradiate uniform light onto the bottom surface of the liquid crystal panel 20 using a surface light source.

The backlight unit 10 is disposed under the liquid crystal panel 20. The backlight unit 10 may include a bottom cover 100, a light guide plate 200, a reflective sheet 201, a light source, for example, a plurality of light emitting diodes 300, a printed circuit board 301, and a wavelength converter ( 400) and a plurality of optical sheets 500.

The bottom cover 100 has a shape in which an upper portion thereof is opened. The bottom cover 100 accommodates the light guide plate 200, the light emitting diodes 300, the printed circuit board 301, the reflective sheet 201, and the optical sheets 500.

The light guide plate 200 is disposed in the bottom cover 100. The light guide plate 200 is disposed on the reflective sheet 201. The light guide plate 200 emits light incident from the light emitting diodes 300 upward through total reflection, refraction, and scattering.

2 and 3, the receiving groove 210 is formed on the side surface of the light guide plate 200, in more detail, on the incident surface 201 of the light guide plate 200. The receiving groove 210 may extend along the incident surface 201 of the light guide plate 200. The receiving groove 210 may have a shape extending in the direction in which the light emitting diodes 300 extend.

The receiving groove 210 is formed in a direction away from the light emitting diodes 300. That is, the depth direction of the receiving groove 210 is a direction away from the light emitting diodes 300.

The receiving groove 210 may include a first inclined surface 211 and a second inclined surface 212 which are inclined with respect to the optical axes of the light emitting diodes 300. The first inclined surface 211 and the second inclined surface 212 may meet each other. Accordingly, the cross-sectional shape of the receiving groove 210 may be triangular. An angle between the first inclined surface 211 and the second inclined surface 212 may be about 30 ° to about 75 °.

In addition, a portion where the first inclined surface 211 and the second inclined surface 212 meet may cross the optical axes of the light emitting diodes 300. That is, the optical axes of the light emitting diodes 300 may pass through portions where the first inclined surface 211 and the second inclined surface 212 meet.

The reflective sheet 201 is disposed under the light guide plate 200. In more detail, the reflective sheet 201 is disposed between the light guide plate 200 and the bottom surface 213 of the bottom cover 100. The reflective sheet 201 reflects light emitted from the lower surface of the light guide plate 200 upward.

The light emitting diodes 300 are light sources for generating light. The light emitting diodes 300 are disposed on one side of the light guide plate 200. The light emitting diodes 300 generate light and enter the light guide plate 200 through a side surface of the light guide plate 200.

The light emitting diodes 300 may be blue light emitting diodes generating blue light or UV light emitting diodes generating ultraviolet light. That is, the light emitting diodes 300 may generate blue light having a wavelength band between about 430 nm and about 470 nm or ultraviolet rays having a wavelength band between about 300 nm and about 400 nm.

The light emitting diodes 300 are mounted on the printed circuit board 301. The light emitting diodes 300 are disposed under the printed circuit board 301. The light emitting diodes 300 are driven by receiving a driving signal through the printed circuit board 301.

The printed circuit board 301 is electrically connected to the light emitting diodes 300. The printed circuit board 301 may mount the light emitting diodes 300. The printed circuit board 301 is disposed inside the bottom cover 100.

The wavelength converter 400 may be disposed on an optical path between the light source and the liquid crystal panel 20. In more detail, the wavelength converter 400 is disposed in the receiving groove 210.

The wavelength converter 400 may be in direct contact with the inner surface of the receiving groove 210. In more detail, the wavelength converter 400 may be in close contact with the accommodation groove 210. Accordingly, the wavelength converter 400 may have the same shape as the receiving groove 210. In more detail, the wavelength converter 400 may have a triangular pillar shape.

In addition, the wavelength converter 400 may have a shape extending in one direction. In more detail, the wavelength converter 400 may have a shape extending along the incident surface 201 of the light guide plate 200.

The wavelength converter 400 may convert the light emitted from the light emitting diodes 300 and output the light to the light guide plate 200.

For example, when the light emitting diodes 300 are blue light emitting diodes, the wavelength converter 400 may convert blue light emitted upward from the light guide plate 200 into green light and red light. That is, the wavelength converter 400 converts a part of the blue light into green light having a wavelength band of about 520 nm to about 560 nm, and another part of the blue light having a wavelength band of about 630 nm to about 660 nm. Can be converted to red light.

In addition, when the light emitting diodes 300 are UV light emitting diodes, the wavelength converter 400 may convert ultraviolet light emitted from the upper surface of the light guide plate 200 into blue light, green light, and red light. That is, the wavelength conversion unit 400 converts a part of the ultraviolet light into blue light having a wavelength band between about 430 nm and about 470 nm, and another part of the ultraviolet light having a wavelength band between about 520 nm and about 560 nm. Green light, and another portion of the ultraviolet light to red light having a wavelength band between about 630 nm and about 660 nm.

Accordingly, the light that is not converted and passes through the wavelength converter 400 and the light converted by the wavelength converter 400 may form white light. That is, blue light, green light, and red light may be combined to allow white light to enter the liquid crystal panel 20.

As shown in FIG. 3, the wavelength converter 400 includes a host 410 and a plurality of wavelength converting particles 420.

The host 410 is disposed in the accommodation groove 210. The host 410 may be in close contact with the inner surface of the receiving groove 210. In more detail, the host 410 may be in close contact with the entire inner surface of the receiving groove 210. That is, the host 410 may be in close contact with the first inclined surface 211 and the second inclined surface 212. Accordingly, the host 410 may have the same shape as the receiving groove 210.

The host 410 surrounds the wavelength conversion particles 420. That is, the host 410 uniformly disperses the wavelength conversion particles 420 therein. The host 410 may be made of a polymer. The host 410 is transparent. That is, the host 410 may be formed of a transparent polymer. Examples of the material used as the host 410 may include a silicone resin.

The wavelength conversion particles 420 are disposed in the receiving groove 210. In more detail, the wavelength conversion particles 420 are uniformly dispersed in the host 410, and the host 410 is disposed in the receiving groove 210.

The wavelength conversion particles 420 convert the wavelength of light emitted from the light emitting diodes 300. The wavelength conversion particles 420 receive light emitted from the light emitting diodes 300 to convert wavelengths. For example, the wavelength conversion particles 420 may convert blue light emitted from the light emitting diodes 300 into green light and red light. That is, some of the wavelength converting particles 420 convert the blue light into green light having a wavelength band between about 520 nm and about 560 nm, and another part of the wavelength converting particles 420 converts the blue light about 630. It can be converted into red light having a wavelength band between nm and about 660 nm.

Alternatively, the wavelength conversion particles 420 may convert ultraviolet light emitted from the light emitting diodes 300 into blue light, green light, and red light. That is, some of the wavelength converting particles 420 convert the ultraviolet light into blue light having a wavelength band of about 430 nm to about 470 nm, and another of the wavelength converting particles 420 converts the ultraviolet light to about 520. It can be converted into green light having a wavelength band between nm and about 560 nm. In addition, another portion of the wavelength conversion particles 420 may convert the ultraviolet light into red light having a wavelength band between about 630 nm and about 660 nm.

That is, when the light emitting diodes 300 are blue light emitting diodes generating blue light, wavelength converting particles 420 for converting blue light into green light and red light may be used. Alternatively, when the light emitting diodes 300 are UV light emitting diodes that generate ultraviolet light, wavelength converting particles 420 that convert ultraviolet light into blue light, green light, and red light may be used.

The wavelength conversion particles 420 may be a quantum dot (QD). The quantum dot may include a core nanocrystal and a shell nanocrystal surrounding the core nanocrystal. In addition, the quantum dot may include an organic ligand bound to the shell nanocrystal. In addition, the quantum dot may include an organic coating layer surrounding the shell nanocrystals.

The shell nanocrystals may be formed of two or more layers. The shell nanocrystals are formed on the surface of the core nanocrystals. The quantum dot may convert the wavelength of the light incident on the core core crystal into a long wavelength through the shell nanocrystals forming the shell layer and increase the light efficiency.

The quantum dot may include at least one of a group II compound semiconductor, a group III compound semiconductor, a group V compound semiconductor, and a group VI compound semiconductor. More specifically, the core nanocrystals may include Cdse, InGaP, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. The shell nanocrystals may include CuZnS, CdSe, CdTe, CdS, ZnSe, ZnTe, ZnS, HgTe or HgS. The diameter of the quantum dot may be 1 nm to 10 nm.

The wavelength of the light emitted from the quantum dot can be adjusted according to the size of the quantum dot. The organic ligand may include pyridine, mercapto alcohol, thiol, phosphine, phosphine oxide, and the like. The organic ligands serve to stabilize unstable quantum dots after synthesis. After synthesis, a dangling bond is formed on the outer periphery, and the quantum dots may become unstable due to the dangling bonds. However, one end of the organic ligand is in an unbonded state, and one end of the unbound organic ligand bonds with the dangling bond, thereby stabilizing the quantum dot.

Particularly, when the quantum dot has a size smaller than the Bohr radius of an exciton formed by electrons and holes excited by light, electricity or the like, a quantum confinement effect is generated to have a staggering energy level and an energy gap The size of the image is changed. Further, the charge is confined within the quantum dots, so that it has a high luminous efficiency.

Unlike general fluorescent dyes, the quantum dots vary in fluorescence wavelength depending on the particle size. That is, as the size of the particle becomes smaller, it emits light having a shorter wavelength, and the particle size can be adjusted to produce fluorescence in a visible light region of a desired wavelength. In addition, since the extinction coefficient is 100 to 1000 times higher than that of a general dye, and the quantum yield is also high, it produces very high fluorescence.

The quantum dot can be synthesized by a chemical wet process. Here, the chemical wet method is a method of growing particles by adding a precursor material to an organic solvent, and the quantum dots can be synthesized by a chemical wet method.

The wavelength converter 400 may be formed by the following process.

First, the wavelength conversion particles 420 are uniformly mixed with a resin composition including a silicone resin or the like. The resin composition may further include a crosslinking agent. In addition, the resin composition may have photocurable or thermosetting.

Thereafter, the resin composition in which the wavelength conversion particles 420 are dispersed is filled in the receiving groove 210. Thereafter, the resin composition filled in the accommodating groove 210 is cured by light and / or heat, and the wavelength converter 400 is formed.

Referring to FIG. 1, the optical sheets 500 are disposed on the light guide plate 200. The optical sheets 500 change or improve characteristics of light emitted from the upper surface of the light guide plate 200 to supply the light to the liquid crystal panel 20.

The optical sheets 500 may be a diffusion sheet 502, a first prism sheet 503, and a second prism sheet 504.

The diffusion sheet 502 is disposed on the wavelength converter 400. The diffusion sheet 502 improves the uniformity of light passing therethrough. The diffusion sheet 502 may include a plurality of beads.

The first prism sheet 503 is disposed on the diffusion sheet 502. The second prism sheet 504 is disposed on the first prism sheet 503. The first prism sheet 503 and the second prism sheet 504 increase the straightness of light passing therethrough.

The liquid crystal panel 20 is disposed on the optical sheets 500. In addition, the liquid crystal panel 20 is disposed on the panel guide 23. The liquid crystal panel 20 may be guided by the panel guide 23.

The liquid crystal panel 20 displays an image by adjusting the intensity of light passing through the liquid crystal panel 20. That is, the liquid crystal panel 20 is a display panel that displays an image by using light emitted from the backlight unit 10. The liquid crystal panel 20 includes a TFT substrate 21, a color filter substrate 22, and a liquid crystal layer interposed between the two substrates. In addition, the liquid crystal panel 20 includes polarization filters.

Although not shown in detail in the drawings, the TFT substrate 21 and the color filter substrate 22 will be described in detail. In the TFT substrate 21, a plurality of gate lines and data lines cross each other to define pixels, and respective intersections are performed. A thin flim transistor (TFT) is provided in each region and is connected in one-to-one correspondence with the pixel electrode mounted in each pixel. The color filter substrate 22 includes a color filter of R, G, and B colors corresponding to each pixel, a black matrix bordering each of them, covering a gate line, a data line, a thin film transistor, and the like, and a common electrode covering all of them. Include.

At the edge of the liquid crystal panel 20, a driving PCB 25 is provided to supply driving signals to the gate line and the data line.

The driving PCB 25 is electrically connected to the liquid crystal panel 20 by a chip on film (COF) 24. Here, the COF 24 may be changed to a tape carrier package (TCP).

As described above, in the liquid crystal display according to the exemplary embodiment, the wavelength converter 400 is disposed inside the accommodation groove 210. Accordingly, since the converted light is directly incident on the light guide plate 200 by the wavelength converter 400, the liquid crystal display according to the exemplary embodiment may minimize light loss and have improved luminance.

In addition, since the wavelength converter 400 is formed directly in the light guide plate 200, no additional member is required. Accordingly, the liquid crystal display according to the embodiment can be easily manufactured at low cost.

In addition, the wavelength converter 400 may be disposed deeper in the groove formed on the side surface of the light guide plate 200 regardless of the gap between the light emitting diode and the light guide plate 200. That is, as the depth of the accommodating groove 210 deepens, the path of the light passing through the wavelength converter 400 may be longer.

Accordingly, the wavelength converter 400 may effectively convert the incident light. Thus, the liquid crystal display according to the embodiment may have improved color reproducibility.

4 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter according to a second embodiment. In the description of the present embodiment, reference is made to the description of the foregoing embodiments. That is, the foregoing description of the liquid crystal display devices may be essentially combined with the description of the present liquid crystal display device, except for the changed part.

Referring to FIG. 4, the inner surface 214 of the accommodation groove 210 includes a curved surface. In more detail, the inner surface 214 of the receiving groove 210 may be a curved surface as a whole. In addition, the wavelength converter 400 may have the same shape as the receiving groove 210. Accordingly, the wavelength converter 400 may have a semicircular column shape.

In addition, the incident surface of the wavelength converter 400 may be flat, and the emission surface 214 of the wavelength converter 400 may be a curved surface. In particular, the emission surface 214 of the wavelength converter 400 may be convex or different from the drawing, and may be concave.

Accordingly, the wavelength converter 400 may effectively receive light emitted from the light emitting diodes 300 and emit light having a desired optical characteristic through the curved emission surface 214.

Therefore, the liquid crystal display according to the present embodiment may have improved optical characteristics.

5 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter according to a third embodiment. In the description of the present embodiment, reference is made to the description of the foregoing embodiments. That is, the foregoing description of the liquid crystal display devices may be essentially combined with the description of the present liquid crystal display device, except for the changed part.

Referring to FIG. 5, the liquid crystal display according to the present exemplary embodiment includes a first passivation layer 430 and a second passivation layer 440.

The first passivation layer 430 is disposed in the accommodation groove 210. The first passivation layer 430 may be coated on the entire inner surface of the first accommodating groove 210. In detail, the first passivation layer 430 may be formed on the inner surface of the accommodating groove 210 and the light guide plate. It may be coated on the incident surface 201 of the 200. In addition, the first passivation layer 430 may be coated on the top and bottom surfaces of the light guide plate 200.

The second passivation layer 440 covers the receiving groove 210. In addition, the second passivation layer 440 covers the wavelength converter 400. That is, the wavelength converter 400 is disposed between the first passivation layer 430 and the second passivation layer 440. That is, the wavelength converter 400 is disposed in the first passivation layer 430. The wavelength converter 400 may be in direct contact with the first passivation layer 430 and the second passivation layer 440.

Transparent inorganic materials such as silicon oxide may be used as the first passivation layer 430 and the second passivation layer 440. In addition, an organic material such as a perlin resin may be used as the first passivation layer 430 and the second passivation layer 440.

The first passivation layer 430 and the second passivation layer 440 may be formed by a vacuum deposition process or the like.

The second passivation layer 440 covers the incident surface 201 of the light guide plate 200. The second passivation layer 440 may be disposed on the top and bottom surfaces of the light guide plate 200. In addition, the second passivation layer 440 may directly contact the first passivation layer 430. That is, the wavelength converter 400 may be sealed by the first passivation layer 430 and the second passivation layer 440.

Therefore, the first passivation layer 430 and the second passivation layer 440 may easily prevent oxygen and / or moisture from penetrating into the wavelength conversion particles 420 of the wavelength conversion unit 400. Therefore, the liquid crystal display according to the present embodiment may have improved reliability and durability.

In addition, the second passivation layer 440 may have a lower refractive index than the host 410. Accordingly, the second passivation layer 440 may function as an anti-reflection film between the wavelength converter 400 and the air layer.

Therefore, the wavelength conversion part 400 may have an improved light incident rate, and the liquid crystal display according to the embodiment may have improved luminance and color reproducibility.

6 is a cross-sectional view illustrating a cross section of a light emitting diode, a light guide plate, and a wavelength converter according to a fourth embodiment. In the description of the present embodiment, reference is made to the description of the foregoing embodiments. That is, the foregoing description of the liquid crystal display devices may be essentially combined with the description of the present liquid crystal display device, except for the changed part.

Referring to FIG. 6, a reflecting film may be disposed in the accommodation groove 210. In more detail, the receiving groove 210 may include a first inclined surface 211, a second inclined surface 212 and a bottom surface 213. The first reflective film 450 may be disposed on the first inclined surface 211. In addition, a second reflective film 460 may be disposed on the second inclined surface 212. In addition, a reflective film may not be disposed on the bottom surface 213.

Accordingly, the bottom surface 213 may be a transmission portion through which light is transmitted.

The first reflective film 450 and the second reflective film 460 may have a high reflectance. Examples of the material used as the first reflective film 450 and the second reflective film 460 may be a material having a high refractive index such as aluminum oxide or titanium oxide.

The light emitted upward and downward from the wavelength converter 400 by the first reflective film 450 and the second reflective film 460 is reflected back to the wavelength converter 400. Accordingly, the path of light incident on the wavelength converter 400 may be increased.

Accordingly, the wavelength converter 400 may have a high wavelength conversion efficiency, and the liquid crystal display according to the embodiment may have an improved color reproduction rate.

FIG. 7 is a cross-sectional view of a light emitting diode, a light guide plate, and a wavelength converter according to a fourth embodiment. In the description of the present embodiment, reference is made to the description of the foregoing embodiments. That is, the foregoing description of the liquid crystal display devices may be essentially combined with the description of the present liquid crystal display device, except for the changed part.

Referring to FIG. 7, the liquid crystal display according to the present exemplary embodiment includes a light collecting part 470.

The condenser 470 is disposed between the light emitting diodes 300 and the light guide plate 200. The condenser 470 is disposed between the light emitting diodes 300 and the wavelength converter 400. The condenser 470 may be in direct contact with the wavelength converter 400.

In more detail, the light collecting part 470 may cover the receiving groove 210. Accordingly, the light collecting unit 470 may perform a protective film function to protect the wavelength converter 400 from external chemical shock.

The condenser 470 may condense the light emitted from the light emitting diodes 300 into the wavelength converter 400. In particular, the focus of the light collecting part 470 may be located between the incident part and the exit part of the wavelength converter 400. In more detail, the focus of the light concentrator 470 may be located in the wavelength converter 400. In more detail, the focus of the light concentrator 470 may be located in the middle of the wavelength converter 400.

Accordingly, light may be concentrated and incident on the wavelength converter 400, and the wavelength converter 400 may have improved wavelength conversion efficiency. Thus, the liquid crystal display according to the embodiment may have improved color reproducibility.

8 is an exploded perspective view illustrating a liquid crystal display according to a sixth embodiment. 9 is a perspective view illustrating a light emitting diode, a light guide plate, and a wavelength converter according to a sixth embodiment. In the description of the present embodiment, reference is made to the description of the foregoing embodiments. That is, the foregoing description of the liquid crystal display devices may be essentially combined with the description of the present liquid crystal display device, except for the changed part.

8 to 9, the liquid crystal display according to the present exemplary embodiment includes a plurality of wavelength converters 600. The wavelength converters 600 correspond to the light emitting diodes 300, respectively. In addition, a plurality of receiving grooves are formed in the incident surface 201 of the light guide plate 200. The receiving grooves correspond to the light emitting diodes 300, respectively.

In this case, the wavelength converters 600 are disposed in the receiving grooves 210, respectively. In addition, the wavelength converters 600 convert wavelengths of light emitted from the corresponding light emitting diodes. In this case, the wavelength converters 600 convert the light emitted from the light emitting diodes into light having a first wavelength such as green light and second wavelength converting light having a second wavelength such as red light. Can be divided into wealth.

In the liquid crystal display according to the present embodiment, the wavelength converters have a relatively small size. Therefore, in manufacturing the liquid crystal display according to the present embodiment, a small amount of light conversion particles 631 may be used.

Therefore, the liquid crystal display according to the present embodiment can be manufactured easily and at low cost by reducing the use of the light conversion particles 631.

In addition, the characteristics of each wavelength converter 600 may be modified to suit the corresponding light emitting diode. Accordingly, the liquid crystal display according to the embodiment may have improved reliability, brightness, and uniform color reproduction.

In addition, the features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (13)

Display panel;
A light guide plate disposed under the display panel;
A light source disposed on a side of the light guide plate; And
And a wavelength converter disposed inside a groove formed on a side surface of the light guide plate. The method of claim 1, wherein the wavelength converter
A host disposed inside the groove; And
A plurality of wavelength converting particles disposed within the host,
The host is in close contact with the inner side of the groove. The method of claim 2, further comprising a protective film covering the groove and coated on the host,
The refractive index of the passivation layer is lower than the refractive index of the host. The method of claim 1, further comprising a reflective film disposed inside the groove,
And the reflective layer includes a transmissive area exposing a portion of an inner side surface of the groove. The display device of claim 1, wherein the reflective film comprises titanium oxide or aluminum oxide. The display device of claim 1, wherein the groove comprises a first inclined surface and a second inclined surface inclined with respect to an optical axis of the light source. The display device of claim 6, wherein the first inclined surface and the second inclined surface meet each other. The display device of claim 7, wherein a portion of the first inclined surface and the second inclined surface intersects an optical axis of the light source. The display device of claim 1, wherein an inner surface of the groove comprises a curved surface. The semiconductor device of claim 1, further comprising: a first passivation layer disposed on an inner side surface of the groove; And
And a second passivation layer covering the groove. The display device of claim 1, further comprising a light condenser interposed between the light source and the wavelength converter. The display device of claim 11, wherein a focus of the light converging part is positioned between an incident part of the wavelength converter and an exit part of the wavelength converter. The method of claim 1, wherein the plurality of light sources,
The groove is a plurality of,
And the light sources and the grooves respectively correspond to each other.

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