KR101251829B1 - Display - Google Patents

Abstract

A display device is disclosed. The display device includes a display panel; An optical plate disposed under the display panel; A light source disposed on one side of the optical plate; And a wavelength conversion member disposed inside the groove formed in the optical plate and converting the wavelength of the light emitted from the light source.

Description

Display device {DISPLAY}

The embodiment relates to a display device.

Light emitting diodes (LEDs) are semiconductor devices that convert electricity into ultraviolet rays, visible rays, and infrared rays by using the characteristics of compound semiconductors. They are mainly used in home appliances, remote controllers, and large electric sign boards.

The high-intensity LED light source is used as an illumination light. It has high energy efficiency, long life and low replacement cost. It is resistant to vibration and shock, and it does not require the use of toxic substances such as mercury. It is replacing incandescent lamps and fluorescent lamps.

Also, the LED is very advantageous as a light source such as a medium and large-sized LCD TV and a monitor. Compared to CCFL (Cold Cathode Fluorescent Lamp), which is mainly used in LCD (Liquid Crystal Display), it has excellent color purity, low power consumption, and easy miniaturization, Is in progress.

Embodiments provide a display device having improved reliability, durability, and color reproducibility.

In one embodiment, a display device includes: a display panel; An optical plate disposed under the display panel; A light source disposed on one side of the optical plate; And a wavelength conversion member disposed inside the groove formed in the optical plate and converting the wavelength of the light emitted from the light source.

In one embodiment, a display device includes an optical plate; A light source disposed on the first surface of the optical plate; A first wavelength conversion member disposed inside the first groove formed on the second surface of the optical plate; And a second wavelength conversion member disposed inside a second groove formed on the third surface of the optical plate.

The display device according to the embodiment includes a wavelength conversion member disposed inside the groove formed in the optical plate. Accordingly, the wavelength conversion member and the light source may be spaced apart from each other by a predetermined distance.

Accordingly, the display device according to the embodiment can prevent the phenomenon caused by the heat generated from the light source.

In addition, the display device according to the exemplary embodiment may insert two or more wavelength conversion members vertically into the optical plate. Accordingly, almost all of the light emitted from the light source passes through the wavelength conversion members.

Accordingly, the display device according to the embodiment may have an improved color reproduction rate.

1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment.
2 is a perspective view illustrating light emitting diodes, a light guide plate, and a wavelength conversion member.
3 is a cross-sectional view illustrating a cross section of the liquid crystal display according to the embodiment.
4 is a cross-sectional view showing a cross section of the wavelength conversion member.
5 is a cross-sectional view illustrating a light emitting diode, a light guide plate, and a wavelength conversion member according to a second embodiment.
6 is a cross-sectional view illustrating a light emitting diode, a light guide plate, a first wavelength conversion member, and a second wavelength conversion member according to a third embodiment.
7 is a cross-sectional view illustrating a light emitting diode, a light guide plate, a first wavelength conversion member, and a second wavelength conversion member according to a fourth 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 light emitting diodes, a light guide plate, and a wavelength conversion member. 3 is a cross-sectional view illustrating a cross section of the liquid crystal display according to the embodiment. 4 is a cross-sectional view showing a cross section of the wavelength conversion member.

1 to 4, a liquid crystal display device according to an embodiment includes a mold frame 10, a backlight assembly 20, and a liquid crystal panel 30.

The mold frame 10 receives the backlight assembly 20 and the liquid crystal panel 30. The mold frame 10 has a rectangular frame shape. Examples of the material used for the mold frame 10 include plastic or reinforced plastic.

In addition, a chassis supporting the mold frame 10 and supporting the backlight assembly 20 may be disposed below the mold frame 10. The chassis may be disposed on a side surface of the mold frame 10.

The backlight assembly 20 is disposed inside the mold frame 10 and emits light toward the liquid crystal panel 30. The backlight assembly 20 may include a reflective sheet 100, a light guide plate 200, a light source, for example, a plurality of light emitting diodes 300, a wavelength conversion member 400, a spacer 210, and a plurality of optical sheets. 500 and a flexible printed circuit board (FPCB) 600.

The reflective sheet 100 reflects light generated from the light emitting diodes 300 upward.

The light guide plate 200 is disposed on the reflective sheet 100, receives light emitted from the light emitting diodes 300, and emits light upward through reflection, refraction, and scattering. The light guide plate 200 is a light guide member for guiding light emitted from the light emitting diodes 300.

The light guide plate 200 includes incident surfaces facing the light emitting diodes 300. That is, the side facing the light emitting diodes 300 among the side surfaces of the light guide plate 200 is an incident surface.

The lens pattern 240 may be formed on an incident surface of the light guide plate 200. The lens pattern 240 may have a Fresnel lens shape. In addition, the lens pattern 240 may be a protrusion pattern or a stripe pattern.

In addition, the light guide plate 200 is an optical member. In more detail, the light guide plate 200 is an optical plate.

As shown in FIGS. 2 and 3, a groove 201 is formed in the light guide plate 200. The groove 201 may be formed on an upper surface of the light guide plate 200. The groove 201 may have a shape corresponding to the wavelength conversion member 400. The groove 201 may include a bottom surface for supporting the wavelength conversion member 400. Alternatively, the groove 201 may penetrate the entire light guide plate 200.

That is, the depth of the groove 201 may correspond to the height of the wavelength conversion member 400. In addition, the width of the groove 201 may correspond to the width of the wavelength conversion member 400. Alternatively, the depth of the groove 201 may be greater than the height of the wavelength conversion member 400, and the width of the groove 201 may be greater than the width of the wavelength conversion member 400.

In addition, the light guide plate 200 may include a light guide part 220, a spacer 210, and a support part 230.

The light guide unit 220 guides the light converted by the wavelength conversion member 400 and the light passing through the wavelength conversion member 400 and emits upward. That is, the light guide unit 220 reflects, refracts, and scatters the incident light, and emits the light upward through the upper surface.

In addition, a part of the inner surface of the groove 201 is an incident surface of the light guide portion 220.

The spacer 210 is disposed between the light emitting diodes 300 and the wavelength conversion member 400. The spacer 210 spaces the light emitting diodes 300 and the wavelength conversion member 400 from each other.

That is, the distance between the light emitting diodes 300 and the wavelength conversion member 400 may be wider than the width of the spacer 210. For example, the width of the spacer 210 may be about 200 μm to about 2.5 mm. In more detail, the width of the spacer 210 may be about 600 μm to about 2.5 mm.

The support part 230 extends from the spacer 210 to the light guide part 220. The support 230 is disposed below the wavelength conversion member 400. In addition, the support part 230 supports the wavelength conversion member 400.

The support 230 constitutes a bottom of the groove 201. The light guide part 220, the spacer 210, and the support part 230 are integrally formed. That is, the light guide part 220, the spacer part 210, and the support part 230 may be formed of the same material.

The wavelength conversion member 400 is disposed inside the groove 201. That is, the wavelength conversion member 400 is inserted into the groove 201.

In addition, the contact member 301 is filled in the groove 201. That is, the contact member 301 may be a filling member filled in the groove 201 as a whole. For example, the adhesion member 301 may be interposed between the wavelength conversion member 400 and the inner surface of the groove 201. In addition, the adhesion member 301 may be in close contact with the wavelength conversion member 400 and may be in close contact with an inner side surface of the groove 201.

In order to form the adhesion member 301, after the wavelength conversion member 400 is inserted into the groove 201, a photocurable resin composition may be injected into the groove 201. Thereafter, the resin composition injected into the groove 201 may be cured by ultraviolet rays, and the adhesion member 301 may be formed.

The wavelength conversion member 400 has a shape extending in one direction. In more detail, the light emitting diodes 300 are arranged in rows in one direction. In this case, the wavelength conversion member 400 may extend along the direction in which the light emitting diodes 300 build heat.

The light emitting diodes 300 are disposed on side surfaces of the light guide plate 200. In more detail, the light emitting diodes 300 are disposed on the incident surface. The light emitting diodes 300 are light sources for generating light. In more detail, the light emitting diodes 300 emit light toward the wavelength conversion member 400.

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 flexible printed circuit board 600. The light emitting diodes 300 are disposed under the flexible printed circuit board 600. The light emitting diodes 300 are driven by receiving a driving signal through the flexible printed circuit board 600.

The wavelength conversion member 400 is disposed inside the groove 201. That is, the wavelength conversion member 400 is inserted into the groove 201. In more detail, the wavelength conversion member 400 is interposed between the spacer 210 and the light guide 220.

In addition, the light emitting diodes 300 may be attached to an incident surface of the light guide plate 200.

The wavelength conversion member 400 receives light emitted from the light emitting diodes 300 and converts the wavelength. For example, the wavelength conversion member 400 may convert blue light emitted from the light emitting diodes 300 into green light and red light. That is, the wavelength conversion member 400 converts a part of the blue light into green light having a wavelength band between about 520 nm and about 560 nm, and another part of the blue light has a wavelength band between about 630 nm and about 660 nm. Can be converted to red light.

In addition, the wavelength conversion member 400 may convert ultraviolet light emitted from the light emitting diodes 300 into blue light, green light, and red light. That is, the wavelength conversion member 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 has 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 passing through the wavelength conversion member 400 and the light converted by the wavelength conversion member 400 may form white light. That is, the blue light, the green light, and the red light may be combined, and the white light may be incident on the light guide plate 200.

As shown in FIGS. 3 and 4, the wavelength conversion member 400 includes a tube 410, a sealing member 420, a plurality of wavelength conversion particles 430, and a matrix 440.

The tube 410 accommodates the sealing member 420, the wavelength converting particles 430, and the matrix 440. That is, the tube 410 is a container for receiving the sealing member 420, the wavelength conversion particles 430, and the matrix 440. In addition, the tube 410 has a shape elongated in one direction.

The tube 410 may have the shape of a rectangular tube 410. That is, the cross section perpendicular to the longitudinal direction of the tube 410 may have a rectangular shape. Further, the width of the tube 410 may be about 0.6 mm, and the height of the tube 410 may be about 0.2 mm. That is, the tube 410 may be a capillary tube.

The tube 410 is transparent. Examples of the material used for the tube 410 include glass and the like. That is, the tube 410 may be a glass capillary tube.

The sealing member 420 is disposed inside the tube 410. The sealing member 420 is disposed at the end of the tube 410. The sealing member 420 seals the inside of the tube 410. The sealing member 420 may include an epoxy resin.

The wavelength converting particles 430 are disposed in the tube 410. In more detail, the wavelength conversion particles 430 are uniformly dispersed in the matrix 440, and the matrix 440 is disposed inside the tube 410.

The wavelength conversion particles 430 convert the wavelength of light emitted from the light emitting diodes 300. The wavelength converting particles 430 receive light emitted from the light emitting diodes 300 to convert wavelengths. For example, the wavelength conversion particles 430 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 430 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 430 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 430 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 430 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 430 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 430 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 for generating blue light, wavelength converting particles 430 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 rays, wavelength converting particles 430 for converting ultraviolet rays into blue light, green light, and red light may be used.

The wavelength conversion particles 430 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 matrix 440 surrounds the wavelength conversion particles 430. That is, the matrix 440 uniformly disperses the wavelength conversion particles 430 therein. The matrix 440 may be composed of a polymer. The matrix 440 is transparent. That is, the matrix 440 may be formed of a transparent polymer.

The matrix 440 is disposed inside the tube 410. That is, the matrix 440 is filled inside the tube 410 as a whole. The matrix 440 may be in close contact with the inner surface of the tube 410.

An air layer is formed between the sealing member 420 and the matrix 440. The air layer 450 is filled with nitrogen. The air layer 450 performs a buffer function between the sealing member 420 and the matrix 440.

The wavelength conversion member 400 may be formed by the following method.

First, the wavelength conversion particles 430 are uniformly dispersed in a resin composition. The said resin composition is transparent. The resin composition may have photocurability.

Thereafter, the inside of the tube 410 is depressurized, the inlet of the tube 410 is immersed in the resin composition in which the wavelength conversion particles 430 are dispersed, and the pressure around it is raised. Accordingly, the resin composition in which the wavelength conversion particles 430 are dispersed is introduced into the tube 410.

Thereafter, a part of the resin composition introduced into the tube 410 is removed, and the inlet portion of the tube 410 is emptied.

Thereafter, the resin composition introduced into the tube 410 is cured by ultraviolet rays, and the matrix 440 is formed.

Thereafter, the epoxy resin composition is introduced into the inlet portion of the tube 410. Thereafter, the introduced epoxy resin composition is cured, and the sealing member 420 is formed. The process of forming the sealing member 420 is performed in a nitrogen atmosphere, and thus, an air layer 450 including nitrogen may be formed between the sealing member 420 and the matrix 440.

The optical sheets 500 are disposed on the light guide plate 200. The optical sheets 500 improve the characteristics of light passing therethrough.

The flexible printed circuit board 600 is electrically connected to the light emitting diodes 300. The light emitting diodes 300 may be mounted. The flexible printed circuit board 600 is a flexible printed circuit board, and is disposed inside the mold frame 10. The flexible printed circuit board 600 is disposed on the light guide plate 200.

The flexible printed circuit board 600 may be attached to the light guide plate 200. That is, a double-sided tape may be interposed between the flexible printed circuit board 600 and the light guide plate 200, and the flexible printed circuit board 600 may be adhered to the light guide plate 200.

The mold frame 10 and the backlight assembly 20 constitute a backlight unit. That is, the backlight unit includes the mold frame 10 and the backlight assembly 20.

The liquid crystal panel 30 is disposed inside the mold frame 10 and disposed on the optical sheets 500.

The liquid crystal panel 30 displays an image by adjusting the intensity of light passing through the liquid crystal panel 30. That is, the liquid crystal panel 300 is a display panel for displaying an image. The liquid crystal panel 30 includes a TFT substrate, a color filter substrate, a liquid crystal layer interposed between the two substrates, and polarizing filters.

As described above, since the wavelength conversion member 400 is inserted into the light guide plate 200, the light emitting diodes 300 and the wavelength conversion member 400 are spaced apart from each other. Accordingly, the light emitting diodes 300 and the wavelength conversion member 400 are sufficiently spaced apart from each other, and the light emitted from the light emitting diodes 300 is sufficiently diffused to enter the wavelength conversion member 400. Can be.

Accordingly, the liquid crystal display according to the embodiment may prevent the light emitted from the light emitting diodes 300 from being concentrated on a portion of the wavelength conversion member 400. As a result, the liquid crystal display according to the exemplary embodiment injects light evenly into the wavelength conversion member 400, thereby preventing denaturation of the wavelength conversion particles generated by the concentrated light.

That is, in the liquid crystal display according to the embodiment, light may be concentrated on only some of the wavelength conversion particles, thereby preventing the wavelength conversion particles from deteriorating.

In addition, since the wavelength conversion member 400 is spaced apart from the light emitting diodes 300, a phenomenon in which the wavelength conversion particles are degraded by heat generated from the light emitting diodes 300 may be prevented.

Accordingly, the liquid crystal display according to the embodiment may have an improved lifespan and durability.

5 is a cross-sectional view illustrating a light emitting diode, a light guide plate, and a wavelength conversion member according to a second embodiment. In the description of the present embodiment, the description of the liquid crystal display is described above, and the shape of the groove is further described. The description of the foregoing embodiment may be essentially combined with the description of the present embodiment, except for the changed part.

Referring to FIG. 5, a groove 202 is formed on the upper surface of the light guide plate 200. The groove 202 includes a first inner surface 211 inclined with respect to the upper surface of the light guide plate 200. The groove 202 also includes a second inner side 212 opposite the first inner side 211. The second inner side surface 212 may be perpendicular to the top surface of the light guide plate 200. In addition, the groove 202 may include a bottom surface extending from the first inner surface 211 to the second inner surface 212.

The distance D1 between the first inner side surface 211 and the wavelength conversion member 400 may become smaller as the groove 202 deepens. That is, the width of the groove 202 may become larger as it approaches the inlet of the groove 202.

In addition, the contact member 301 may be filled in the groove 202. In more detail, the adhesion member 301 may be filled between the first inner side surface 211 and the wavelength conversion member 400.

Since the first inner side surface 211 is inclined with respect to the upper surface of the light guide plate 200, the groove 202 may have a wide entrance. Accordingly, the wavelength conversion member 400 may be easily inserted into the groove 202.

That is, the second inner side surface 212 serves as a reference for determining the position of the wavelength conversion member 400. That is, after the operator inserts the wavelength conversion member 400 into the groove 202, the operator directly contacts the wavelength conversion member 400 to the second inner side surface 212. Thereafter, the resin composition for forming the adhesion member 301 is filled in the groove 202, and cured to fix the wavelength conversion member 400.

Accordingly, the wavelength conversion member 400 may be fixed at the correct position inside the groove 202. Therefore, the liquid crystal display according to the embodiment can be easily manufactured and can have improved optical characteristics.

6 is a cross-sectional view illustrating a light emitting diode, a light guide plate, a first wavelength conversion member, and a second wavelength conversion member according to a third embodiment. In the description of the present exemplary embodiment, the description of the liquid crystal display devices described above will be referred to, and the first wavelength converting member and the second wavelength converting member will be further described. The description of the foregoing embodiments may be essentially combined with the description of the present embodiment, except for the changed part.

Referring to FIG. 6, the liquid crystal display according to the present exemplary embodiment includes a first wavelength converting member 401 and a second wavelength converting member 402.

The light guide plate 200 is formed with a first groove 203 and a second groove 204.

The first groove 203 is formed on the upper surface 207 of the light guide plate 200. The second groove 202 is formed in the bottom surface 209 of the light guide plate 200. In this case, the upper surface 207 of the light guide plate 200 and the lower surface 209 of the light guide plate 200 face each other. In addition, the incident surface 208 of the light guide plate 200 extends from the top surface 207 of the light guide plate 200 to the bottom surface 209 of the light guide plate 200.

The first groove 203 and the second groove 204 are staggered from each other. That is, when viewed from the top side, the first groove 203 and the second groove 204 may be mutually staggered. In addition, the first groove 203 and the second groove 204 overlap each other. That is, when viewed from the side, the first groove 203 and the second groove 204 overlap each other. In more detail, when viewed from the light emitting diode, the first groove 203 and the second groove 204 may overlap each other.

The first wavelength conversion member 401 is inserted into the first groove 203, and the second wavelength conversion member 402 is inserted into the second groove 204. Similarly, when viewed from the light emitting diode, the first groove 203 and the second groove 204 may overlap each other.

As such, the liquid crystal display according to the exemplary embodiment inserts two or more wavelength conversion members 401 and 402 into the light guide plate 200 vertically. Accordingly, the wavelength converting members 401 and 402 pass through the first wavelength converting member 401 or the second wavelength converting member 402 to almost all of the light emitted from the light emitting diodes 300. do.

Accordingly, the liquid crystal display according to the embodiment may have an improved color reproduction rate.

7 is a cross-sectional view illustrating a light emitting diode, a light guide plate, a first wavelength conversion member, and a second wavelength conversion member according to a fourth embodiment. In the description of the present embodiment, reference is made to the description of the above liquid crystal display devices. The description of the foregoing embodiments may be essentially combined with the description of the present embodiment, except for the changed part.

Referring to FIG. 7, the first wavelength conversion member 401 is inserted in a direction inclined with respect to the upper surface of the light guide plate 200. In addition, the second wavelength conversion member 402 is inserted in a direction inclined with respect to the bottom surface of the light guide plate 200.

The first groove 205 includes a first inner side surface 213 and a second inner side surface 214 that are inclined with respect to the upper surface of the light guide plate 200. The first inner side 213 and the second inner side 214 may face each other and may be parallel to each other. Similarly, the second groove 206 includes a third inner side surface and a fourth inner side surface which are inclined with respect to the lower surface of the light guide plate 200. The third inner side 215 and the fourth inner side 216 may face each other and may be parallel to each other.

The first wavelength conversion member 401 and the second wavelength conversion member 402 are inserted in a direction inclined to the first groove 205 and the second groove 206.

The first wavelength converting member 401 and the second wavelength converting member 402 may be inclined toward the light emitting diode 300. Accordingly, as the first groove 205 deepens, the distance D2 between the light emitting diodes 300 and the first wavelength conversion member 401 may become larger. In addition, as the second groove 206 deepens, the distance between the light emitting diode 300 and the second wavelength conversion member 402 may become larger.

As such, the first wavelength conversion member 401 and the second wavelength conversion member 402 are inserted in a direction inclined with respect to the light guide plate 200. Accordingly, the light emitted from the light emitting diodes 300 may pass through the first wavelength conversion member 401 and the second wavelength conversion member 402 in a longer path.

Accordingly, the liquid crystal display according to the present embodiment may have improved color reproducibility.

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 the embodiments 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 (12)

Display panel;
An optical plate disposed under the display panel;
A light source disposed on one side of the optical plate; And
A wavelength conversion member disposed inside a groove formed in the optical plate and converting a wavelength of light emitted from the light source,
The groove includes a first inner surface inclined with respect to an upper surface of the optical plate. The light source of claim 1, wherein the light sources include a plurality of light emitting diodes arranged in rows in one direction.
The wavelength conversion member extends in the same direction in which the light emitting diodes are arranged. The display device of claim 1, wherein the groove penetrates through an upper surface and a lower surface of the optical plate. The method of claim 1,
And a distance between the first inner side surface and the wavelength conversion member becomes smaller as the groove becomes deeper. The method of claim 4, wherein the groove further comprises a second inner side surface opposite to the first inner side surface,
The wavelength conversion member is in direct contact with the second inner surface. The display device of claim 1, wherein the groove further comprises a second inner side surface facing the first inner side surface and inclined with respect to an upper surface of the optical plate. The display device of claim 1, further comprising an adhesion member interposed between the wavelength conversion member and the first inner surface. Optical plate;
A light source disposed on the first surface of the optical plate;
A first wavelength conversion member disposed inside the first groove formed on the second surface of the optical plate; And
A second wavelength conversion member disposed inside a second groove formed on the third surface of the optical plate,
And a distance between the first wavelength converting member and the light source increases as the first groove deepens. 9. The method of claim 8, wherein the second face and the third face face each other,
And the first surface extends from the second surface to the third surface. delete The display device of claim 8, wherein a distance between the second wavelength converting member and the light source becomes larger as the second groove deepens. The display device of claim 8, wherein the first wavelength conversion member and the second wavelength conversion member overlap each other when viewed from the light source.

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