KR20130000293A - Display device - Google Patents

Abstract

PURPOSE: A display device is provided to effectively change the wavelength of the light coming from a light source. CONSTITUTION: A light source(300) is arranged on the side of a light guide plate(200). A wavelength conversion member is interposed between the light guide plate and the light source. The wavelength conversion member includes a wavelength conversion layer(430), a first substrate(410) and a second substrate(420). The wavelength conversion layer is interposed between the light guide plate and the light source. The first substrate is interposed between the wavelength conversion layer and the light source. The second substrate is interposed between the wavelength conversion layer and the light guide plate.

Description

Display device {DISPLAY DEVICE}

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 and optical characteristics and which can be easily manufactured.

In one embodiment, a display device includes: a light guide plate; A light source disposed on a side of the light guide plate; And a wavelength conversion member interposed between the light guide plate and the light source, wherein the wavelength conversion member comprises a wavelength conversion layer interposed between the light guide plate and the light source; A first substrate interposed between the wavelength conversion layer and the light source; And a second substrate interposed between the wavelength conversion layer and the light guide plate.

In the display device according to the exemplary embodiment, the wavelength conversion member is disposed between the light guide plate and the light source. As a result, the wavelength conversion member having a small size can be used to effectively convert the wavelength of the light emitted from the light source.

Accordingly, the display device according to the embodiment can reduce the amount of material used for the wavelength conversion member and can be easily manufactured at low cost.

In addition, a protection unit may be disposed on side surfaces of the first substrate, the wavelength conversion layer, and the second substrate to protect the wavelength conversion layer. Accordingly, the wavelength conversion layer may be effectively protected from chemical shocks such as external moisture and / or oxygen by the protection part, and may have improved reliability and durability.

In addition, the protection unit may function as a reflective layer. Accordingly, the display device according to the embodiment can have improved optical characteristics.

1 is an exploded perspective view showing a liquid crystal display device according to a first embodiment.
2 is a perspective view illustrating the wavelength conversion member according to the first embodiment.
FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 2.
4 is a cross-sectional view illustrating a cross section of the light guide plate, the light emitting diode, and the wavelength conversion member according to the first embodiment.
5 to 7 are views illustrating a process of manufacturing the wavelength conversion member.
8 is an exploded perspective view illustrating a liquid crystal display according to a second embodiment.
9 is a perspective view illustrating the wavelength conversion member according to the second embodiment.
FIG. 10 is a cross-sectional view taken along the line BB ′ of FIG. 9.
FIG. 11 is a cross-sectional view of a light guide plate, a light emitting diode, and a wavelength conversion member according to a second embodiment.
12 is a cross-sectional view illustrating a cross section of the light guide plate, the light emitting diode, and the wavelength conversion member according to the third embodiment.
FIG. 13 is a cross-sectional view of a light guide plate, a light emitting diode, and a 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 the wavelength conversion member according to the first embodiment. FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 2. 4 is a cross-sectional view illustrating a cross section of the light guide plate, the light emitting diode, and the wavelength conversion member according to the first embodiment. 5 to 7 are views illustrating a process of manufacturing the wavelength conversion member.

1 to 4, 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 conversion member ( 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.

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 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 conversion member 400 may be disposed on an optical path between the light source and the liquid crystal panel 20. In more detail, the wavelength conversion member 400 is interposed between the light emitting diodes 300 and the light guide plate 200. In more detail, the wavelength conversion member 400 is adhered to the light guide plate 200. In more detail, the wavelength conversion member 400 is adhered to the incident surface of the light guide plate 200.

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

The wavelength conversion member 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 conversion member 400 may convert blue light emitted upward from the light guide plate 200 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, when the light emitting diodes 300 are UV light emitting diodes, the wavelength conversion member 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 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 that is not converted and passes through the wavelength conversion member 400 and the light converted by the wavelength conversion member 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 illustrated in FIGS. 2 and 3, the wavelength conversion member 400 includes a lower substrate 410, an upper substrate 420, a wavelength conversion layer 430, and a side protection part 440.

The lower substrate 410 is disposed under the wavelength conversion layer 430. The lower substrate 410 may be transparent and flexible. The lower substrate 410 may be in close contact with the bottom surface of the wavelength conversion layer 430.

Examples of the material used as the lower substrate 410 may include a transparent polymer such as polyethyleneterephthalate (PET).

The upper substrate 420 is disposed on the wavelength conversion layer 430. The upper substrate 420 may be transparent and flexible. The upper substrate 420 may be in close contact with the top surface of the wavelength conversion layer 430.

Examples of the material used as the upper substrate 420 may include a transparent polymer such as polyethylene terephthalate.

The lower substrate 410 and the upper substrate 420 sandwich the wavelength conversion layer 430. The lower substrate 410 and the upper substrate 420 support the wavelength conversion layer 430. The lower substrate 410 and the upper substrate 420 protect the wavelength conversion layer 430 from an external physical shock. The lower substrate 410 and the upper substrate 420 may be in direct contact with the wavelength conversion layer 430.

In addition, the lower substrate 410 and the upper substrate 420 have low oxygen permeability and moisture permeability. Accordingly, the lower substrate 410 and the upper substrate 420 may protect the wavelength conversion layer 430 from external chemical impact such as moisture and / or oxygen.

The wavelength conversion layer 430 is interposed between the lower substrate 410 and the upper substrate 420. The wavelength conversion layer 430 may be in close contact with the upper surface of the lower substrate 410, and may be in close contact with the lower surface of the upper substrate 420.

The wavelength conversion layer 430 includes a plurality of wavelength conversion particles 431 and a host layer 432.

The wavelength converting particles 431 are disposed between the lower substrate 410 and the upper substrate 420. In more detail, the wavelength conversion particles 431 are uniformly dispersed in the host layer 432, and the host layer 432 is disposed between the lower substrate 410 and the upper substrate 420.

The wavelength converting particles 431 convert the wavelength of light emitted from the light emitting diodes 300. The wavelength converting particles 431 receive light emitted from the light emitting diodes 300 to convert wavelengths. For example, the wavelength conversion particles 431 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 431 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 431 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 431 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 431 convert the ultraviolet light into blue light having a wavelength band between about 430 nm and about 470 nm, and another part of the wavelength converting particles 431 converts the ultraviolet light 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 431 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 431 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 431 for converting ultraviolet rays into blue light, green light, and red light may be used.

The wavelength conversion particles 431 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. In addition, 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 host layer 432 surrounds the wavelength conversion particles 431. That is, the host layer 432 uniformly disperses the wavelength conversion particles 431 therein. The host layer 432 may be made of a polymer. The host layer 432 is transparent. That is, the host layer 432 may be formed of a transparent polymer.

The host layer 432 is disposed between the lower substrate 410 and the upper substrate 420. The host layer 432 may be in close contact with an upper surface of the lower substrate 410 and a lower surface of the upper substrate 420.

The side protection part 440 is disposed on the side of the host layer 432. In more detail, the side protection part 440 covers the side surface of the host layer 432. In more detail, the side protection part 440 is also disposed on side surfaces of the lower substrate 410 and the upper substrate 420. In more detail, the side protection part 440 covers side surfaces of the lower substrate 410 and the upper substrate 420.

In addition, the side protection part 440 may be adhered to side surfaces of the host layer 432, the lower substrate 410, and the upper substrate 420. The side protection part 440 is in close contact with side surfaces of the host layer 432, the lower substrate 410, and the upper substrate 420.

Accordingly, the side protection part 440 may seal the side surface of the host layer 432. That is, the side protection part 440 is a protection part that protects the host layer 432 from external chemical shock.

Examples of the material used as the side protection part 440 include an inorganic material such as silicon oxide, or an organic material such as silicone resin, acrylic resin, or epoxy resin. In addition, a metal such as aluminum or silver may be used as the side protection part 440.

In addition, the side protection part 440 may perform a reflective layer function to reflect light from the wavelength conversion layer 430.

In addition, the wavelength conversion member 400 may further include a first inorganic protective film and a second inorganic protective film. The first inorganic protective film may be coated on the lower surface of the lower substrate 410, and the second inorganic protective film may be coated on the upper surface of the upper substrate 420. Examples of the material used for the first inorganic protective film and the second inorganic protective film include silicon oxide and the like.

The wavelength conversion member 400 according to the present embodiment may be formed by the following process.

Referring to FIG. 5, a resin composition including a plurality of wavelength converting particles 431 is coated on a first transparent substrate 411. Thereafter, the resin composition is cured by light and / or heat, and a quantum dot layer 433 is formed on the first transparent substrate 411.

Thereafter, a second transparent substrate 421 is laminated on the quantum dot layer 433.

Referring to FIG. 6, the first transparent substrate 411, the quantum dot layer 433, and the second transparent substrate 421 are cut at a time. Accordingly, a plurality of preliminary wavelength conversion members 401 are formed. The preliminary wavelength conversion members 401 include a lower substrate 410, a wavelength conversion layer 430, and an upper substrate 420, respectively. In this case, since the lower substrate 410, the wavelength conversion layer 430, and the upper substrate 420 are formed by the same cutting process, the lower substrate 410, the wavelength converting layer 430, and the upper substrate 420 include cutting surfaces 405 disposed on the same plane.

Referring to FIG. 7, the preliminary wavelength converting members 401 are aligned with each other such that the lower substrate 410 and the upper substrate 420 face each other. Thereafter, side protection parts 440 are formed on the side surfaces of the preliminary wavelength conversion members 401, that is, the cut surface 405.

The side protection part 440 may be formed by a coating and curing process of the resin composition. Alternatively, the side protection part 440 may be formed by deposition of an inorganic material such as silicon oxide. Alternatively, the side protection part 440 may be formed by deposition of a metal such as silver or aluminum.

Thereafter, the formed wavelength conversion members can be separated from each other.

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 conversion member 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.

A driving PCB 25 is provided at the edge of the liquid crystal display panel 210 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, the side protection part 440 may effectively seal the wavelength conversion layer 430 from the outside. Accordingly, the liquid crystal display according to the embodiment can effectively protect the wavelength conversion particles 431 from external moisture and / or oxygen.

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

In addition, the side protection part 440 may reflect the light emitted from the wavelength conversion layer 430 and enter the wavelength conversion layer 430 or the light guide plate 200. Therefore, the liquid crystal display according to the embodiment can reduce the leakage light and have improved optical characteristics.

In the liquid crystal display according to the present embodiment, the wavelength conversion layer 430 has a relatively small size. Therefore, in manufacturing the liquid crystal display according to the present embodiment, a small amount of wavelength converting particles 431 may be used.

Therefore, the liquid crystal display according to the present embodiment can be manufactured easily and at a low cost by reducing the use of the wavelength conversion particles 431.

8 is an exploded perspective view illustrating a liquid crystal display according to a second embodiment. 9 is a perspective view illustrating the wavelength conversion member according to the second embodiment. FIG. 10 is a cross-sectional view taken along the line BB ′ in FIG. 9. FIG. 11 is a cross-sectional view of a light guide plate, a light emitting diode, and a wavelength conversion member 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.

8 to 11, the liquid crystal display according to the present exemplary embodiment includes a plurality of wavelength converting members 600. The wavelength conversion members 600 correspond to the light emitting diodes 400, respectively.

In addition, the wavelength conversion members 600 are disposed between the light emitting diodes 400 and the light guide plate 200. That is, each wavelength conversion member 600 is disposed between the corresponding light emitting diode and the light guide plate 200.

In addition, the wavelength conversion members 600 convert the wavelength of light emitted from the corresponding light emitting diode. In this case, the wavelength conversion members 600 convert the light emitted from the light emitting diodes into the light of the first wavelength conversion members 600 and the light of the second wavelength such as red light to convert the light emitted from the light emitting diodes into light of the first wavelength such as green light. It may be divided into the second wavelength conversion member 600 to make.

The wavelength conversion members 600 may have a larger planar area than the light emitting diodes 400. Accordingly, almost all of the light emitted from each light emitting diode may be incident on the corresponding wavelength converting member 600.

8 to 11, the wavelength conversion members 600 include a lower substrate 610, an upper substrate 620, a wavelength conversion layer 630, and a side protection part 640. .

Features of the lower substrate 610, the upper substrate 620, the wavelength conversion layer 630, and the side protection part 640 may be substantially the same as those described in the above-described embodiments.

In the liquid crystal display according to the present embodiment, the wavelength conversion layer 630 has 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 conversion member 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.

12 is a cross-sectional view illustrating a cross section of the light guide plate, the light emitting diode, and the wavelength conversion member according to the 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. 12, the side protection part 740 may extend to the top and bottom surfaces of the light guide plate 200. In more detail, the side protection part 740 includes a first side protection part 741 and a second side protection part 742.

The first side protection part 741 covers the lower substrate 710, the wavelength conversion layer 730, and the first cut surface 705 of the upper substrate 720. In addition, the first side surface protection part 741 covers a portion of the lower surface of the light guide plate 200. In more detail, the first side protection part 741 is adhered to the first cut surface 705 and a part of the lower surface of the light guide plate 200.

The second side protection part 742 covers the lower substrate 710, the wavelength conversion layer 730, and the second cut surface 706 of the upper substrate 720. In addition, the second side protection part 742 covers a part of the upper surface of the light guide plate 200. In more detail, the second side protection part 742 is attached to the second cut surface 706 and a portion of the upper surface of the light guide plate 200.

The side protection part 740 may be formed after the lower substrate 710, the wavelength conversion layer 730, and the upper substrate 720 are bonded to the incident surface of the light guide plate 200. For example, after the lower substrate 710, the wavelength conversion layer 730, and the upper substrate 720 are bonded to the light guide plate 200, the first cut surface 705 and the light guide plate 200 may be formed. A white ink or metal layer is coated on the lower surface. Accordingly, the first side protection part 741 may be formed.

Similarly, after the lower substrate 710, the wavelength conversion layer 730, and the upper substrate 720 are adhered to the light guide plate 200, the lower substrate 710, the wavelength conversion layer 730, and the upper substrate 720 are attached to the light guide plate 200. A white ink or metal layer is coated. Accordingly, the second side protection part 742 may be formed.

The second side protection part 742 not only seals the wavelength conversion layer 730 from the outside, but also the wavelength conversion layer 730 of the upper surface of the wavelength conversion layer 730 and the light guide plate 200. Light can be prevented from leaking in adjacent parts.

That is, the side protection part 740 corresponds to a reflection protection part that reflects incident light.

Accordingly, the liquid crystal display according to the present embodiment may have improved reliability and durability, and may have improved luminance and luminance uniformity.

FIG. 13 is a cross-sectional view of a light guide plate, a light emitting diode, and a wavelength conversion member 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. 13, the wavelength conversion member 800 is also adhered to the lower surface and the upper surface of the light guide plate 200. That is, the wavelength conversion member 800 is adhered to the lower surface, the incident surface and the upper surface of the light guide plate 200. That is, the wavelength conversion member 800 extends from the bottom surface of the light guide plate 200 to the top surface of the light guide plate 200 along the incident surface of the light guide plate 200.

In more detail, the upper substrate 820 is attached to the lower surface, the incident surface and the upper surface of the light guide plate 200. Similarly, the wavelength conversion layer 830 extends from the bottom surface of the light guide plate 200 to the top surface of the light guide plate 200 through the incident surface of the light guide plate 200.

The first side protection part 841 covers a side surface of the lower substrate 810, a side surface of the wavelength conversion layer 830, a side surface of the upper substrate 820, and a portion of a bottom surface of the light guide plate 200. That is, the first side surface side protection part is coated on the side surface of the lower substrate 810, the side surface of the wavelength conversion layer 830, the side surface of the upper substrate 820, and a portion of the bottom surface of the light guide plate 200.

The second side protection part 842 covers the side surface of the lower substrate 810, the side surface of the wavelength conversion layer 830, the side surface of the upper substrate 820, and a portion of an upper surface of the light guide plate 200. That is, the first side protection part 841 may be formed on a side surface of the lower substrate 810, a side surface of the wavelength conversion layer 830, a side surface of the upper substrate 820, and a part of an upper surface of the light guide plate 200. Coated.

The first side protection part 841 and the second side protection part 842 have the lower substrate 810, the wavelength conversion layer 830, and the upper substrate 820 under the light guide plate 200. After being bonded to the incident surface and the upper surface, it can be formed. For example, after the lower substrate 810, the wavelength conversion layer 830, and the upper substrate 820 are bonded to the light guide plate 200, the side surface of the lower substrate 810 and the wavelength conversion layer ( A white ink or a metal layer is coated on the side of the 830, the side of the upper substrate 820, and the bottom of the light guide plate 200. Accordingly, the first side protection part 841 may be formed.

Similarly, after the lower substrate 810, the wavelength conversion layer 830, and the upper substrate 820 are bonded to the light guide plate 200, the side surface of the lower substrate 810 and the wavelength conversion layer 830 are attached. A side surface of the upper substrate 820 and the upper surface of the light guide plate 200 is coated with a white ink or a metal layer. Accordingly, the second side protection part 842 may be formed.

The first side protection part 841 and the second side protection part 842 not only seal the wavelength conversion layer 830 from the outside, but also an upper surface of the wavelength conversion layer 830 and the light guide plate 200. Among them, light may be prevented from leaking in a portion adjacent to the wavelength conversion layer 830.

That is, the first side protection part 841 and the second side protection part 842 are reflection protection parts that reflect incident light.

Accordingly, the liquid crystal display according to the present embodiment may have improved reliability and durability, and may have improved luminance and luminance uniformity.

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 (10)

Light guide plate;
A light source disposed on a side of the light guide plate; And
A wavelength conversion member interposed between the light guide plate and the light source;
The wavelength conversion member
A wavelength conversion layer interposed between the light guide plate and the light source;
A first substrate interposed between the wavelength conversion layer and the light source; And
And a second substrate interposed between the wavelength conversion layer and the light guide plate. The display device of claim 1, wherein the wavelength conversion layer, the first substrate, and the second substrate include a cut surface disposed on the same plane. The display device of claim 2, further comprising a side protection part disposed on the cut surface. The display device of claim 3, wherein the side protection part is disposed on an upper surface of the light guide plate. The display device of claim 1, wherein the wavelength conversion member is attached to the light guide plate. The display device of claim 1, wherein the wavelength conversion member extends from a lower surface of the light guide plate to an upper surface of the light guide plate. The display device of claim 6, wherein the second substrate is attached to a lower surface of the light guide plate, a side surface of the light guide plate, and an upper surface of the light guide plate. The display device of claim 6, further comprising a reflective protective part covering a lower surface of the light guide plate and a side surface of the wavelength conversion member. The display device of claim 6, further comprising a reflective protective part covering a lower surface of the light guide plate and a side surface of the wavelength conversion member. The display device of claim 8, wherein the reflective protector comprises a white ink or a metal layer.

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