Backlight unit

Abstract

Provided is a backlight unit. The backlight unit includes a central region and a peripheral region disposed outside the central region. Among them, the backlight unit includes: a chassis; a plurality of light sources disposed on one surface of the chassis; a reflective layer disposed on one surface of the chassis and including a plurality of light source insertion holes and a plurality of opening patterns; and a light correction material layer disposed between the chassis and the reflective layer in the peripheral region. The plurality of light source insertion holes expose each of the light sources, and the plurality of opening patterns are disposed in the peripheral region and expose at least a part of the region of the light correction material layer in the thickness direction.

Description

Technical Field

[0001] The present invention relates to a backlight unit. Background Art

[0002] A liquid crystal display device receives light from a backlight unit to display an image. The backlight unit includes a plurality of light sources. Light emitted from the light sources is incident on a liquid crystal display panel via an optical film or the like.

[0003] Recently, in order to improve the brightness uniformity of a liquid crystal display device to ensure appearance and reduce thickness, application of a filter layer has been studied. The filter layer is formed by repeatedly laminating a plurality of refractive layers having different refractive indexes, whereby the transmittance varies according to the wavelength region and / or the incident angle of light incident on the filter layer, and thus light can be diffused.

[0004] In the case of an edge-type backlight unit in which light sources are located on the side of a display panel, a diffusion plate is disposed above a light guide plate. On the contrary, in the case of a direct-lit backlight unit in which light sources are disposed below a display panel, the diffusion plate faces the light sources directly. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a backlight unit capable of adjusting the density of a light correction material layer by using the arrangement density of a plurality of opening patterns formed in a reflection layer.

[0006] The problems of the present invention are not limited to the above-mentioned problems, and those skilled in the art can clearly understand other technical problems not mentioned from the following description.

[0007] According to an embodiment, a backlight unit for solving the above problem includes a central region and a peripheral region disposed outside the central region, wherein the backlight unit includes: a chassis; a plurality of light sources disposed on one surface of the chassis; a reflection layer disposed on one surface of the chassis and including a plurality of light source insertion holes and a plurality of opening patterns; and a light correction material layer disposed between the chassis and the reflection layer in the peripheral region, the plurality of light source insertion holes exposing each of the light sources, and the plurality of opening patterns being disposed in the peripheral region and exposing at least a part of the light correction material layer in the thickness direction.

[0008] It may be that the plurality of opening patterns are spaced apart from each other, and the arrangement density of the plurality of opening patterns decreases as going from the peripheral region to the central region.

[0009] It may be that the planar area of each of the opening patterns decreases as going from the peripheral region to the central region, and the planar area of the light correction material layer exposed by each of the opening patterns decreases as going from the peripheral region to the central region.

[0010] It may be that each of the light sources emits light in a first wavelength band, and the light correction material layer includes a material that absorbs the light in the first wavelength band.

[0011] It may be that each of the light sources emits light in a first wavelength band, and the light correction material layer includes a material that converts the light in the first wavelength band into light in a second wavelength band different from the first wavelength band.

[0012] It may be that the light source emits blue light, and the light correction material layer includes a material that converts the blue light into yellow light.

[0013] It may be that the opening pattern and the light source insertion hole are spaced apart from each other.

[0014] It may be that each of the light source insertion holes surrounds each of the light sources, and the thickness of the reflective layer is less than the thickness of the light source.

[0015] It may be that the light source insertion hole includes: at least one first light source insertion hole disposed in the peripheral region; and at least one second light source insertion hole disposed in the central region, and the first light source insertion hole exposes at least a part of the light correction material layer.

[0016] It may be that the backlight unit further includes a substrate disposed between the chassis and the reflective layer, and the substrate includes: one surface facing the reflective layer; and the other surface opposite to the one surface, and the light source is disposed on one surface of the substrate.

[0017] Specific matters of other embodiments are included in the detailed description and the drawings.

[0018] (Advantages of the Invention)

[0019] In the backlight unit according to an embodiment, a light correction material layer is coated under a reflective layer including an opening pattern, and the arrangement density of the opening pattern is adjusted, so that the density of the light correction material layer exposed in the thickness direction of the display device can be adjusted. Therefore, there is no need to redesign the arrangement density of the light correction material layer according to the material for the reflective layer or the coating equipment for patterning the light correction material layer, and thus the manufacturing process can be efficient.

[0020] The advantages according to the present invention are not limited to the above-exemplified contents, and more advantages are included in this specification. Description of the Drawings

[0021] Figure 1 is an exploded perspective view of a display device according to an embodiment.

[0022] Figure 2 is a cross-sectional view taken along the line II-II' of Figure 1 ​

[0023] Figure 3 is a top view of a backlight unit according to an embodiment.

[0024] Figure 4 is a layout diagram showing the relative positional relationship between a chassis and a reflective layer according to an embodiment.

[0025] Figure 5 is a layout diagram showing the relative positional relationship between a chassis and a light correction material layer according to an embodiment.

[0026] Figure 6 is a top view showing the relative positional relationship between a chassis, a reflective layer, and a light source.

[0027] Figure 7 is showing along Figure 6 a cross-sectional view of an example taken along line VII-VII'.

[0028] Figure 8 is along Figure 6 another cross-sectional view of an example taken along line VII-VII'.

[0029] Figure 9 is an exploded perspective view of a backlight unit according to another embodiment.

[0030] Figure 10 is showing Figure 9 a layout diagram of an example of the relative arrangement of a light source component, a chassis, and a light correction material layer of the backlight unit.

[0031] Figure 11 is showing Figure 9 a layout diagram of an example of the relative arrangement of a light source component, a chassis, and a reflective layer of the backlight unit.

[0032] Figure 12 is showing Figure 9 a top view of a reflective layer, a chassis, and a light correction material layer of the backlight unit.

[0033] Figure 13 is showing Figure 9 a cross-sectional view of a light source component, a light guide plate, a reflective layer, a light correction material layer, and a chassis of the backlight unit.

[0034] Figure 14 is showing Figure 9 another layout diagram of an example of the relative arrangement of a light source component, a chassis, and a light correction material layer of the backlight unit.

[0035] Figure 15 is showing Figure 9 another layout diagram of an example of the relative arrangement of a light source component, a chassis, and a reflective layer of the backlight unit.

[0036] (Description of the reference numerals)

[0037] 1: Display device

[0038] 10: Backlight unit

[0039] 100: Light source component

[0040] 110: Substrate

[0041] 120: Light source

[0042] CA: Central area

[0043] AHA: Peripheral area

[0044] 800: Chassis

[0045] 810: Bottom surface

[0046] 300: Light correction material layer Detailed description of the embodiments

[0047] Referring to the embodiments described in detail hereinafter with reference to the accompanying drawings, the advantages and features of the present invention and the methods for realizing them will become clear. However, the present invention is not limited to the embodiments disclosed below and can be implemented in various different forms. These embodiments are merely provided to make the disclosure of the present invention complete and to fully convey the scope of the invention to those of ordinary skill in the technical field to which the present invention pertains. The present invention is defined only by the scope of the claims. Figure 1

[0048] When an element or layer is referred to as being "on" another element or layer, it includes all cases where it is directly on the other element or there is another layer or other element in between. Throughout the specification, the same reference numerals refer to the same components.

[0049] Although the first, second, etc. are used to describe various components, it is obvious that these components are not limited to these terms. These terms are merely used to distinguish one component from another. Therefore, the first component mentioned below can obviously also be the second component within the technical concept of the present invention.

[0050] Hereinafter, specific embodiments will be described with reference to the accompanying drawings.

[0051] Figure 1 Figure 2 is an exploded perspective view of a display device according to an embodiment. Figure 1 is a cross-sectional view taken along line II-II' of

[0052] ​​In the accompanying drawings, a first direction DR1, a second direction DR2, and a third direction DR3 are defined. The first direction DR1 and the second direction DR2 may be directions perpendicular to each other in a plane. The third direction DR3 may be a direction perpendicular to the plane in which the first direction DR1 and the second direction DR2 lie. The third direction DR3 forms a perpendicular with respect to each of the first direction DR1 and the second direction DR2. In an embodiment, the third direction DR3 represents the thickness direction of the display device 1.

[0053] In the following embodiments, unless otherwise mentioned separately, the side of the first direction DR1 refers to the upper side direction in the top view, the other side of the first direction DR1 refers to the lower side direction in the top view, the side of the second direction DR2 refers to the upper right side direction in the top view, and the other side of the second direction DR2 refers to the upper left side direction in the top view. Additionally, the upper side in the third direction DR3 represents the display direction. Similarly, the upper surface refers to the surface facing the side in the third direction DR3. Further, the lower side in the third direction DR3 represents the opposite direction of the display direction, and the lower surface refers to the surface facing the other side in the third direction DR3.

[0054] Refer to Figure 1 and Figure 2 , as a device for displaying images or pictures, the display device 1 may include various electronic devices such as a television, an outdoor billboard, a monitor, a personal computer, a laptop computer, a tablet computer, a smart phone, a car navigation unit, a camera, a center information display (CID) provided in a car, a watch-type electronic device, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), and a game console. These are only presented as examples, and of course, other electronic devices may also be adopted as long as the concept of the present invention is not departed from.

[0055] The display device 1 may be configured in a rectangular shape including a long side and a short side where the second direction DR2 is longer than the first direction DR1 on a plane. The corner where the long side and the short side of the display device 1 intersect on the plane may be a right angle, but is not limited thereto, and may also have an arc-shaped curve. The planar shape of the display device 1 is not limited to the illustrated shape, and a square, a circle, an ellipse, or other shapes may also be applicable. The display surface of the display device 1 may be disposed on one side of the third direction DR3 which is the thickness direction.

[0056] The display device 1 may include a display panel 70 and a backlight unit 10 disposed below the display panel 70 and providing light to the display panel 70.

[0057] The display panel 70 can receive light emitted from the backlight unit 10 and display an image. The display panel 70 can be a light-receiving type display panel. For example, it can be a liquid crystal display panel, an electro-wetting display panel, an electrophoretic display panel, etc. Hereinafter, the case where the display panel 70 is a liquid crystal display panel (Liquid crystal panel, LCD) will be illustrated. However, it is obvious that the following description can also be equally applied to the case where the display panel 70 is of other types.

[0058] The display panel 70 can include an upper substrate 710, a lower substrate 720 opposite to the upper substrate 710, and a liquid crystal layer 730 disposed therebetween. The display panel 70 can further include a plurality of pixels. The pixels of the display panel 70 can be arranged in row and column directions. The display panel 70 can include: a switching element and a pixel electrode provided for each pixel; and a common electrode opposite to the pixel electrode. It can be that the switching element and the pixel electrode are disposed on the lower substrate 720, and the common electrode is disposed on the upper substrate 710. However, it is not limited thereto, and the common electrode can also be disposed on the lower substrate 720. A sealing member is disposed at the edges of the upper substrate 710 and the lower substrate 720 to enclose the liquid crystal molecules of the liquid crystal layer 730.

[0059] The backlight unit 10 is disposed below the display panel 70. The backlight unit 10 can be disposed to overlap with the display panel 70 in the third direction DR3.

[0060] In one embodiment, the backlight unit 10 can include a chassis 800, a light source component 100 accommodated in the chassis 800, a reflective layer 200, a light correction material layer 300 (refer to Figure 5 ), a diffusion plate 410, a wavelength conversion layer 500, and an optical sheet 600.

[0061] The light source component 100 can include a substrate 110 and a plurality of light sources 120 disposed on the substrate 110.

[0062] The light source 120 emits light provided to the display panel 70. The light source 120 can be a point light source. The light source 120 can be provided in the form of a chip. In an exemplary embodiment, the light source 120 can be an LED chip (Light Emitting Diode Chip), but it is not limited thereto. The light emission direction of each light source 120 can be generally upward in the drawing.

[0063] The light source 120 can emit light in a specific wavelength band. For example, the light source 120 can emit blue light having a wavelength band of 420 nm to 470 nm. In some embodiments, the light source 120 can emit light having two or more peak wavelengths. For example, the light source 120 can emit near-ultraviolet wavelength light and blue light.

[0064] The light emitted from the light source 120 can be incident on the diffusion plate 410 above.

[0065] The reflective layer 200 can be disposed on the substrate 110 so as to surround at least one light source 120. The reflective layer 200 reflects at least a part of the light that is emitted from the light source 120 and travels upward but is reflected and enters the side of the reflective layer 200, and causes the light to enter again toward the diffusion plate 410 disposed above.

[0066] The diffusion plate 410 can be disposed above the light source unit 100. The diffusion plate 410 can be disposed at a distance from the light source unit 100 in the third direction DR3. The diffusion plate 410 can be disposed at a predetermined distance from the light source 120 of the light source unit 100 so that the light emitted from the light source 120 is dispersed to prevent light from gathering. The diffusion plate 410 functions to disperse the light emitted from the light source 120 toward the display panel 70 side and to provide the light emitted from the light source 120 to the display panel 70 with a more uniform brightness.

[0067] The diffusion plate 410 can include a light-transmissive substance. For example, the diffusion plate 410 can include substances such as polymethyl methacrylate (PMMA), polystyrene (PS), polypropylene (PP), polyethylene terephthalate (PET), and polycarbonate (PC).

[0068] The wavelength conversion layer 500 can be disposed above the diffusion plate 410. The wavelength conversion layer 500 functions to convert the wavelength of at least a part of the light emitted from the diffusion plate 410 toward the display panel 70 side.

[0069] The wavelength conversion layer 500 can include an adhesive layer and wavelength conversion particles dispersed in the adhesive layer. In addition, the wavelength conversion layer 500 can include scattering particles dispersed in the adhesive layer in addition to the wavelength conversion particles.

[0070] The adhesive layer, as a medium in which the wavelength conversion particles are dispersed, can be composed of various resin compositions. However, it is not limited thereto, and as long as it is a medium capable of dispersing the wavelength conversion particles and / or the scattering particles, it can be referred to as an adhesive layer regardless of its name, additional other functions, constituent substances, etc.

[0071] The wavelength conversion particles, as particles that convert the wavelength of the incident light, can be, for example, quantum dots (QD), fluorescent substances, or phosphorescent substances. Hereinafter, the case where the wavelength conversion particles are quantum dots will be described, but it is not limited thereto.

[0072] Quantum dots, as substances with a crystalline structure on the order of a few nanometers, are composed of several hundred to several thousand atoms. Due to their small size, they can exhibit the quantum confinement effect where the band gap becomes larger. When light with a wavelength whose energy is higher than the band gap is incident on a quantum dot (QD), the quantum dot (QD) absorbs the light and becomes excited, and while emitting light of a specific wavelength, it drops to the ground state. The light of the specific wavelength emitted has a value corresponding to the band gap. By adjusting the size, composition, etc. of such a quantum dot (QD), the light-emitting characteristics based on the quantum confinement effect can be adjusted.

[0073] Quantum dots can include at least one of II-VI group compounds, II-V group compounds, III-VI group compounds, III-V group compounds, IV-VI group compounds, I-III-VI group compounds, II-IV-VI group compounds, and II-IV-V group compounds.

[0074] Quantum dots can include a core and a shell coating the core. Although the core is not limited to this, for example, it can be CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InP, InAs, InSb, SiC, Ca, Se, In, P, Fe, Pt, Ni, Co, Al, Ag, Au, Cu, FePt, Fe 2 O 3 、Fe 3 O 4 、Si, and Ge. Although the shell is not limited to this, for example, it can include at least one of ZnS, ZnSe, ZnTe, CdS, CdSe, CdTe, HgS, HgSe, HgTe, AlN, AlP, AlAs, AlSb, GaN, GaP, GaAs, GaSb, GaSe, InN, InP, InAs, InSb, TlN, TlP, TlAs, TlSb, PbS, PbSe, and PbTe.

[0075] The wavelength conversion particles may include a plurality of wavelength conversion particles that convert incident light into different wavelengths from each other. For example, the wavelength conversion particles may include a first wavelength conversion particle that converts incident light of a specific wavelength into a first wavelength and emits it, and a second wavelength conversion particle that converts it into a second wavelength and emits it. In an exemplary embodiment, the light emitted from the light source 120 and incident on the wavelength conversion particles is light of a blue wavelength. It may be that the first wavelength is a green wavelength and the second wavelength is a red wavelength. It may be that the blue wavelength is a wavelength having a peak in the range of 420 nm to 470 nm, the green wavelength is a wavelength having a peak in the range of 520 nm to 570 nm, and the red wavelength is a wavelength having a peak in the range of 620 nm to 670 nm. However, the blue, green, and red wavelengths are not limited to the above examples and should be understood to include all wavelength ranges that can be discriminated as blue, green, and red in the present technical field.

[0076] At least one optical sheet 600 may be disposed above the wavelength conversion layer 500. The optical sheet 600 may perform optical functions such as condensing, refracting, diffusing, reflecting, polarizing, and phase retardation on the incident light. Examples of the optical sheet 600 include a prism sheet, a microlens, a biconvex sheet, a diffusion sheet, a polarizing sheet, a reflective polarizing sheet, a retardation sheet, a protective sheet, and the like. The optical sheet 600 may integrally combine layers having a plurality of optical functions. In an exemplary embodiment, the optical sheet 600 may include a structure in which a first prism sheet, a second prism sheet, and a reflective polarizing sheet are sequentially stacked.

[0077] The first prism sheet and the second prism sheet serve to refract the traveling path of the light and increase the front brightness. The reflective polarizing sheet allows light of a specific polarization to pass through and reflects and re-uses light of other polarizations, thereby increasing the brightness.

[0078] The chassis 800 may be a housing component of the backlight unit 10 including the light source component 100. The chassis 800 may provide a space inside it for accommodating the light source component 100 and the like.

[0079] The chassis 800 may include a bottom surface portion 810 and side walls 820. The side walls 820 of the chassis 800 may be connected to the bottom surface portion 810 and bent in a vertical direction therefrom. The light source component 100 is disposed on the bottom surface portion 810 of the chassis 800. Although not shown in the drawings, the light source component 100, the diffusion plate 410, the wavelength conversion layer 500, and the optical sheet 600 may be fixed to the side walls 820 of the chassis 800 by a separate adhesive tape. However, it is not limited thereto, and the components may also be hung on other mounting structures, or hung or attached to a mold frame provided inside the chassis 800.

[0080] Hereinafter, the light source component 100, the reflective layer 200, the light correction material layer 300, and the chassis 800 will be described in detail.

[0081] Figure 3 is a top view of a backlight unit according to an embodiment. In Figure 3 , for ease of explanation, only a plurality of light sources of the backlight unit are shown.

[0082] Referring to Figure 3 , the backlight unit 10 may include a central region CA and a peripheral region AHA. The central region CA may have a rectangular shape approximately in a top view in accordance with the overall shape of the backlight unit 10. The peripheral region AHA may be disposed on the edge (or outside) of the central region CA in a plane so as to entirely or partially surround the central region CA. In an exemplary embodiment, the peripheral region AHA may be disposed adjacent to the four sides of the central region CA.

[0083] A plurality of light sources 120 may be disposed in the central region CA and the peripheral region AHA. The plurality of light sources 120 may include a first light source 120a disposed in the peripheral region AHA and a second light source 120b disposed in the central region CA. The first light source 120a and the second light source 120b may be substantially the same except for the disposed regions.

[0084] The plurality of light sources 120 may be disposed at predetermined intervals while being spaced apart from each other in a first direction DR1 and a second direction DR2 in a plane. Here, the plurality of light sources 120 being spaced apart from each other means being spaced apart from each other based on the light emitting portions of the respective light sources 120. Therefore, not only in the case where the light source packages constituting the respective light sources 120 are spaced apart from each other, but also in the case where the light source packages of the respective light sources 120 are adjacent or connected, if the light emitting portions of the plurality of light sources 120 are spaced apart, it is also interpreted that the plurality of light sources 120 are spaced apart. In the drawings, a case where the arrangement direction of the light sources 120 is consistent with the extending directions of the long side and the short side of the display device 1 is illustrated, but it is not limited thereto, and the arrangement direction of the light sources 120 and the extending direction of the long side / short side of the display device 1 may be inclined at a predetermined angle. Additionally, in Figure 3 the illustrated embodiment, a case where the light sources 120 are arranged such that each row and each column extend in a straight line is shown, but the light sources 120 may also be arranged such that adjacent rows and / or adjacent columns are staggered with each other.

[0085] Unless Figure 3 is separately mentioned, the interval of the first direction DR1 of each light source 120 is defined as the closest distance among the distances between the two relatively opposite sides in the first direction DR1 of two adjacent light sources 120 in the first direction DR1, and the interval of the second direction DR2 of each light source 120 is defined as the closest distance among the distances between the two relatively opposite sides in the second direction DR2 of two adjacent light sources 120 in the second direction DR2.

[0086] Each light source 120 may be configured in a square shape. Hereinafter, in the embodiment, the planar shape of each light source 120 is described as a square shape, but the planar shape of each light source 120 is not limited thereto, and other shapes such as a rectangle or a circle may be applicable.

[0087] The intervals in the first direction DR1 and the second direction DR2 of each light source 120 may be Figure 3 the same as each other as shown. However, it is not limited thereto, and the intervals between two adjacent light sources 120 in the first direction DR1 and the intervals between two adjacent light sources 120 in the second direction DR2 may also be different from each other.

[0088] Figure 4 is a configuration diagram showing the relative positional relationship between the chassis and the reflective layer according to an embodiment. Figure 5 is a configuration diagram showing the relative positional relationship between the chassis and the optical correction material layer according to an embodiment. Figure 6 is a top view showing the relative positional relationship between the chassis, the reflective layer, and the light source.

[0089] Referring to Figures 4 to 6 , the reflective layer 200 may be disposed on the bottom surface portion 810 of the chassis 800.

[0090] The reflective layer 200 may have a planar shape substantially similar to the bottom surface portion 810 of the chassis 800. For example, when the bottom surface portion 810 has a rectangular planar shape, the reflective layer 200 may also have a similar rectangular planar shape. The size of the reflective layer 200 and the size of the bottom surface portion 810 may be substantially the same in the top view, but it is not limited thereto.

[0091] The reflective layer 200 may include a plurality of opening patterns 210H and a plurality of light source insertion holes 220H disposed at intervals from the plurality of opening patterns 210H.

[0092] The plurality of opening patterns 210H may be formed at the edge of the reflective layer 200. That is, the plurality of opening patterns 210H may be disposed in the peripheral region AHA. The opening pattern 210H may be patterned at the edge of the reflective layer 200 to completely penetrate the reflective layer 200 in the third direction DR3 (or the thickness direction) to form.

[0093] The height of the plurality of opening patterns 210H may be the same as the height of the reflective layer 200.

[0094] Each opening pattern 210H may be formed while maintaining a predetermined interval from each other. The plurality of opening patterns 210H may be formed while maintaining a predetermined interval along the first direction DR1 and / or the second direction DR2.

[0095] The arrangement density of the opening pattern 210H can vary according to the region. For example, it can be such that the region adjacent to the central region CA where the proportion of white light is high due to the reuse of monochromatic light (cyan light) emitted from the light source 120 has a low arrangement density, and the edge portion of the peripheral region AHA where the proportion of white light is relatively low and the proportion of monochromatic light (cyan light) increases has a high arrangement density. In an exemplary embodiment, it can be that the opening pattern 210H is arranged in the peripheral region AHA, and the arrangement density of the opening pattern 210H decreases as going in the direction from the peripheral region AHA to the central region CA.

[0096] The planar shape of the opening pattern 210H on the plane can be square. The planar areas of the respective opening patterns 210H can be different from each other. The planar area of the opening pattern 210H can decrease as going in the direction from the peripheral region AHA to the central region CA. However, it is not limited to this, and the planar shape and / or area of each opening pattern 210H can be variously deformed. For example, the planar areas of the respective opening patterns 210H can also be the same, or the arrangement density can be adjusted by decreasing the number of arranged opening patterns 210H as going in the direction from the peripheral region AHA to the central region CA. Additionally, the planar shape of each opening pattern 210H can also be applied in other shapes such as a circle, an ellipse, a rectangle, etc.

[0097] A plurality of light source insertion holes 220H can be formed at the center and the edge of the reflective layer 200. The light source insertion holes 220H can be formed by completely penetrating the reflective layer 200 in the third direction DR3 (or the thickness direction). The light source insertion holes 220H can be cylindrical with a predetermined width and a predetermined height.

[0098] The height of the light source insertion holes 220H can be the same as the height of the reflective layer 200.

[0099] On the plane, the plurality of light source insertion holes 220H can be circular with the same area for each. However, it is not limited to this, and the planar shape of the light source insertion holes 220H can also be applied in other shapes such as a square, an ellipse, a rectangle, etc., or the sizes of the planar shapes of the respective light source insertion holes 220H can be different from each other.

[0100] The respective light source insertion holes 220H can be formed while being spaced apart at a predetermined interval. The plurality of light source insertion holes 220H can be formed while being spaced apart at a predetermined interval along the first direction DR1 and the second direction DR2. The reflective layer 200 can be arranged such that at least one light source 120 is exposed to the third direction DR3 (or the thickness direction) by each light source insertion hole 220H. In one embodiment, each light source insertion hole 220H can be formed to correspond one-to-one with one light source 120.

[0101] Each light source insertion hole 220H formed in the reflective layer 200 may be configured to surround at least one light source 120. The light source insertion hole 220H may completely expose the light source 120 in the third direction DR3. In one embodiment, the light source insertion hole 220H can completely expose the light source 120 in the direction of the display surface because the area ratio on the plane is larger than the area of the corresponding light source 120 on the plane.

[0102] The interval between two adjacent light source insertion holes 220H in the first direction DR1 and the interval between two adjacent light source insertion holes 220H in the second direction DR2 may be the same as each other. However, this is not limited thereto, and depending on the shape of the individual light source insertion holes 220H, the interval between two adjacent light source insertion holes 220H in the first direction DR1 and the interval between two adjacent light source insertion holes 220H in the second direction DR2 may also be different from each other.

[0103] The plurality of light source insertion holes 220H may include a first light source insertion hole 221H disposed in the peripheral area AHA and a second light source insertion hole 222H disposed in the central area CA. In the peripheral area AHA, the first light source insertion hole 221H and the opening pattern 210H may be spaced apart from each other.

[0104] The first light source insertion hole 221H may expose the first light source 120a disposed in the peripheral area AHA in the third direction DR3. The first light source insertion hole 221H may expose at least a part of the area of the light correction material layer 300, which is configured to surround the first light source 120a on the plane, in the third direction DR3.

[0105] The light correction material layer 300 may be disposed on the bottom surface portion 810 of the chassis 800. The light correction material layer 300 may be disposed on the entire bottom surface portion 810 in the peripheral area AHA. The light correction material layer 300 may be disposed between the bottom surface portion 810 and the reflective layer 200 in the peripheral area AHA.

[0106] A part of the area of the light correction material layer 300 may be exposed in the third direction DR3 by the opening pattern 210H of the reflective layer 200. On the plane, the light correction material layer 300 may be exposed in the third direction DR3 by the plurality of opening patterns 210H in the peripheral area AHA in the pattern shape of the opening pattern 210H.

[0107] The planar area of the light correction material layer 300 exposed by the opening pattern 210H in the third direction DR3 may be the same as the planar area of the opening pattern 210H. That is, the density of the light correction material layer 300 exposed in the third direction DR3 may be adjusted by the arrangement density of the opening pattern 210H. In an exemplary embodiment, the planar area of the light correction material layer 300 exposed by the opening pattern 210H in the third direction DR3 may decrease as going from the peripheral region AHA to the central region CA. However, not limited thereto, various deformations of the area and shape of the exposed light correction material layer 300 may be made by the planar shape of the plurality of opening patterns 210H formed in the reflective layer 200.

[0108] On a plane, the light correction material layer 300 disposed adjacent to the first light source 120a disposed in the peripheral region AHA may be exposed in the third direction DR3 by the first light source insertion hole 221H. The light correction material layer 300 exposed by the plurality of first light source insertion holes 221H may be a shape obtained by removing the planar shape of the first light source 120a from the planar shape of the first light source insertion hole 221H on the plane. That is, the planar area of the light correction material layer 300 exposed by the plurality of first light source insertion holes 221H may be an area obtained by removing the planar area of the first light source 120a from the planar area of the first light source insertion hole 221H.

[0109] The light correction material layer 300 may be disposed in the peripheral region AHA and include a material that absorbs or converts the light of the first band emitted from the light source 120 into light of a second band different from the first band. The light correction material layer 300 is disposed in the peripheral region AHA and absorbs or converts the light of the first band emitted from the light source 120 into light of a second band different from the first band, thereby preventing an increase in the amount of light of the first band in the peripheral region AHA and reducing color reproducibility. For example, when the light source 120 emits blue light, the proportion of blue light may increase in the peripheral region AHA, resulting in a cyan color compared to the central region CA. To reduce the color difference between the central region CA and the peripheral region AHA, the color reproducibility of the display device 1 may be improved by reducing the amount of light of the blue wavelength in the peripheral region AHA.

[0110] To reduce the color difference between the central region CA and the peripheral region AHA, the color reproducibility may be improved by reducing the blue wavelength light in the peripheral region AHA. Therefore, the material constituting the light correction material layer 300 may have the property of absorbing the light of the first band emitted from the light source 120 or converting the light of the first band into light of a second band different from the first band.

[0111] In an exemplary embodiment, the light correction material layer 300 may include a material that absorbs light or blue light. For example, the light correction material layer 300 may be composed of a yellow pigment that has a complementary color relationship with blue. As a complementary color to blue, the yellow pigment can absorb blue light. As another example, the light correction material layer 300 may be composed of a black pigment. When the light correction material layer 300 includes a material having the property of absorbing light, the brightness may decrease, but the color difference in the peripheral area AHA that may appear cyan can be reduced.

[0112] In another exemplary embodiment, the light correction material layer 300 may include a material that converts blue light into yellow light. For example, the light correction material layer 300 may include a yellow phosphor. The yellow phosphor may be one of YAG series phosphors and silicates, but is not limited thereto.

[0113] The light correction material layer 300 absorbs at least a part of the light incident on the opening pattern 210H side of the reflection layer 200 or converts it into light of other colors, thereby reducing the brightness of the blue light in the peripheral area AHA and improving the color difference uniformity according to the area.

[0114] Hereinafter, the light source component 100, the reflection layer 200, the light correction material layer 300, and the chassis 800 will be described in detail.

[0115] Figure 7 It is a cross-sectional view showing an example taken along the Figure 6 VII-VII' line.

[0116] Referring to Figures 4 to 7 , the light source component 100 may include a substrate 110 and a plurality of light sources 120 disposed on the substrate 110.

[0117] The substrate 110 may be an insulating substrate or a circuit board. When the substrate 110 is an insulating substrate, the substrate 110 may be composed of a transparent material such as glass or quartz, or may be composed of a polymer such as polyimide. When the substrate 110 is an insulating substrate, the light source component 100 may further include a circuit element layer (not shown) for driving the light sources 120. The circuit element layer may also be formed on one surface of the insulating substrate, or may be composed of a printed circuit board or the like and attached or fixed to one surface of the insulating substrate. When the substrate 110 is a circuit board, the substrate 110 may be composed of a printed circuit board (PCB). When the substrate 110 is a printed circuit board, the plurality of light sources 120 mounted on the substrate 110 may be electrically connected to each other.

[0118] The substrate 110 may have a planar shape that is substantially similar to that of the display panel 70. For example, when the display panel 70 has a rectangular planar shape, the substrate 110 may also have a similar rectangular planar shape. In a top view, the size of the substrate 110 and the size of the display panel 70 may be substantially the same, but this is not limited thereto.

[0119] A plurality of light sources 120 may be disposed on one surface of the substrate 110. Each light source 120, although not limited thereto, may include an LED (Light Emitting Diode). A diverging lens or the like may also be disposed above the light source 120, but the LED may also be directly exposed without an additional lens as shown in the figure. The light emission direction of the light source 120 may be generally upward in the drawing.

[0120] The light source 120 may emit light in a specific wavelength band. For example, the light source 120 may emit blue light having a wavelength band of 420 nm to 470 nm. In some embodiments, the light source 120 may emit light having two or more peak wavelengths. For example, the light source 120 may emit near-ultraviolet wavelength light and blue light. Hereinafter, a case where the light emitted by the light source 120 is blue light having a wavelength band of 420 nm to 470 nm will be illustrated as an example. However, it is obvious that cases where the wavelength band of the light emitted by the light source 120 is different may also be applied in the same manner as the following description.

[0121] A reflective layer 200 may be disposed on the substrate 110. The reflective layer 200 serves to reflect at least a part of the light that leaks in the lateral direction from the light emitted by the light source 120 and / or the light that enters the display panel 70 side from the light emitted by the light source 120 but is not transmitted and is reflected, and re-enters the display panel 70.

[0122] The reflective layer 200 may include a reflective material. The reflective layer 200 may be formed of a material including, for example, silver (Ag), copper (Cu), aluminum (Al), nickel (Ni), lanthanum (La), or an alloy thereof, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ITZO (Indium Tin-Zinc Oxide), or the like, but is not limited thereto.

[0123] The reflective layer 200 may be disposed to surround the light source 120 in a top view. In one embodiment, the reflective layer 200 may have a light source insertion hole 220H at a position where a plurality of light sources 120 arranged in a matrix shape are disposed and be horizontally spaced from the light source 120 on the substrate 110. The reflective layer 200 may not overlap with the light source 120 in the thickness direction on the substrate 110.

[0124] The light correction material layer 300 may be disposed in the peripheral region AHA. The light correction material layer 300 may be between the substrate 110 and the reflective layer 200 in the peripheral region AHA. In the peripheral region AHA, the light correction material layer 300 may be disposed on one side of the substrate 110 where the first light source 120a is not disposed. The light correction material layer 300 may be disposed entirely on the upper surface of the substrate 110 where the first light source 120a is exposed in the peripheral region AHA.

[0125] The light correction material layer 300 may include an upper surface, a lower surface, and a side surface. The lower surface of the light correction material layer 300 is placed on the upper surface of the substrate 110 in the peripheral region AHA. The upper surface of the light correction material layer 300 faces a partial region of the lower surface of the reflective layer 200. The upper surface and the lower surface of the light correction material layer 300 are respectively located on a plane, and the plane where the upper surface is located and the plane where the lower surface is located are substantially parallel, so that it can have an overall uniform thickness. The thickness of the light correction material layer 300 may be less than the height of the light source 120.

[0126] The reflective layer 200 may expose at least a partial region of the light correction material layer 300 to the third direction DR3 in the peripheral region AHA in a top view. The light correction material layer 300 disposed in the peripheral region AHA may be exposed by the first light source insertion holes 221H and the opening patterns 210H of the reflective layer 200.

[0127] The lower surface of the reflective layer 200 is placed on one side of the substrate 110 in the central region CA and on one side of the light correction material layer 300 in the peripheral region AHA. The upper surface of the reflective layer 200 faces the lower surface of the diffusion plate 410 disposed above. The upper surface and the lower surface of the reflective layer 200 are respectively located on a plane, and the plane where the upper surface is located and the plane where the lower surface is located are substantially parallel, so that it can have an overall uniform thickness. The thickness of the reflective layer 200 may be less than the height of the light source 120.

[0128] The backlight unit 10 according to the present embodiment may dispose the light correction material layer 300 in the peripheral region AHA of the backlight unit 10. By the arrangement density of the plurality of opening patterns 210H penetrating the reflective layer 200 disposed on the light correction material layer 300, the area of the light correction material layer 300 exposed to the third direction DR3 can be adjusted. Therefore, in the manufacturing process, the process of redesigning the arrangement density of the light correction material layer 300 when patterning and coating the light correction material layer 300 on the upper surface and / or the lower surface of the reflective layer 200 according to the material of the reflective layer 200 is omitted, so that there is no need to redesign the arrangement density of the light correction material layer 300 according to the material of the reflective layer 200, and thus the manufacturing process efficiency can be increased.

[0129] Figure 8 is along Figure 6Cross-sectional view of another example taken along line VII-VII'.

[0130] Refer to Figure 8 , Figure 8 The embodiment of Figure 7 differs from the embodiment of Figure 7 in that the light correction material layer is disposed on the upper surface of the bottom surface of the chassis. For the same components as those in the embodiments described above, the same reference numerals are used and their descriptions are omitted. Hereinafter, the description will be mainly focused on the differences from the embodiment of Figure 7 .

[0131] The light correction material layer 300_1 can be disposed between the bottom surface 810 and the substrate 110_1 in the peripheral region AHA. The light correction material layer 300_1 can be formed by printing a light correction material on the upper surface of the bottom surface 810.

[0132] The light correction material layer 300_1 can be disposed to overlap with the reflective layer 200, the first light source 120a, and the substrate 110_1 disposed in the peripheral region AHA in the thickness direction.

[0133] In this embodiment, the substrate 110_1 can be made of a transparent material such as glass or quartz. Since the substrate 110_1 is made of a transparent material, the light of the first wavelength band emitted from the light source 120 can pass through the substrate 110_1 and enter the light correction material layer 300_1 even when traveling toward the substrate 110_1 side. The light passing through the substrate 110_1 can absorb at least a part of the light entering the light correction material layer 300_1 or convert it into light of a second wavelength band different from the first wavelength band. The light converted by the light correction material layer 300_1 can pass through the substrate 110_1 again and enter the display panel 70 side.

[0134] In the case of this embodiment, since the light correction material layer 300_1 is not disposed on the upper surface of the substrate 110_1 but on the upper surface of the bottom surface 810 of the chassis, the process efficiency of coating the light correction material to form the light correction material layer 300_1 can be increased. In addition, since the substrate 110_1 is made of a transparent material, even though the light correction material layer 300_1 is disposed below the substrate 110_1, the color difference between the central region CA and the peripheral region AHA can be reduced.

[0135] Hereinafter, another embodiment of the backlight unit will be described. In the following embodiments, for the same components as those in the embodiments described above, the same reference numerals are used and their descriptions are omitted or simplified, and the description will be mainly focused on the differences.

[0136] Figure 9 is an exploded perspective view of a backlight unit according to another embodiment. Figure 10 Shows Figure 9Configuration diagram of an example of the relative arrangement of a light source component, a chassis, and a light correction material layer of a backlight unit. Figure 11 Shows Figure 9 Configuration diagram of an example of the relative arrangement of a light source component, a chassis, and a reflective layer of a backlight unit. Figure 12 Shows Figure 9 Top view of a reflective layer, a chassis, and a light correction material layer of a backlight unit. Figure 13 Shows Figure 9 Cross-sectional view of a light source component, a light guide plate, a reflective layer, a light correction material layer, and a chassis of a backlight unit.

[0137] Refer to Figures 9 to 13 According to another embodiment, the backlight unit 10_2 includes a light source component 100_2, a reflective layer 200, a light correction material layer 300_2, a light guide plate 420, a wavelength conversion layer 500, an optical sheet 600, and a chassis 800 that houses the components.

[0138] The light guide plate 420 serves to guide the traveling path of light. The light guide plate 420 may generally have a polyhedral prism shape. The planar shape of the light guide plate 420 may be a rectangle having a short side in a first direction DR1 and a long side in a second direction DR2, but is not limited thereto. In an exemplary embodiment, the light guide plate 420 is generally a hexahedral prism shape with a rectangular planar shape, and may include an upper surface 420US, a lower surface 420BS, and four side surfaces (420S: 420S1, 420S2, 420S3, 420S4). When it is necessary to distinguish the four side surfaces separately in this specification and the accompanying drawings, they are labeled with "420S1", "420S2", "420S3", "420S4", but when simply referring to one side surface, it is labeled with "420S".

[0139] In one embodiment, the upper surface 420US and the lower surface 420BS of the light guide plate 420 are respectively located on one plane, and the plane where the upper surface 420US is located and the plane where the lower surface 420BS is located are substantially parallel, so that the light guide plate 420 can have an overall uniform thickness. However, it is not limited thereto, and the upper surface 420US or the lower surface 420BS may be composed of multiple planes, or the plane where the upper surface 420US is located and the plane where the lower surface 420BS is located may intersect. For example, it may be like a wedge-shaped light guide plate, where the thickness becomes thinner as it goes from one side surface (e.g., the light incident surface) to the other side surface (e.g., the light output surface) opposite thereto. Additionally, it may be formed in a shape such that near one side surface (e.g., the light incident surface), as it goes to a specific point and then to the other side surface (e.g., the light output surface) opposite thereto, the lower surface 420BS slopes upward and the thickness becomes narrower, and then the upper surface 420US and the lower surface 420BS are flat.

[0140] The plane located above 420US and / or below 420BS can form an angle of approximately 90° with the planes located on each side 420S. In some embodiments, the light guide plate 420 can include inclined surfaces between the upper surface 420US and each side surface 420S and / or between the lower surface 420BS and each side surface 420S. In other words, the light guide plate 420 can include chamfers formed by cutting off each corner. The chamfers can serve to mitigate the sharpness of the corner portions of the light guide plate 420 to prevent breakage caused by external impacts. Hereinafter, a case where there is no inclined surface between the upper surface 420US and the side surface 420S and they have a directly intersecting 90° angle will be described, but it is not limited thereto.

[0141] The light source component 100_2 of the backlight unit 10_2 according to the present embodiment can be disposed adjacent to at least one side surface 420S of the light guide plate 420. In the drawings, a case where a plurality of light sources (LED packages) 120_2 disposed on the substrate 110_2 are disposed adjacent to the side surface 420S1 of one long side of the light guide plate 420 is illustrated, but it is not limited thereto. For example, the plurality of light sources 120_2 can also be disposed adjacent to all of the side surfaces 420S1 and 420S2 of the two long sides, or adjacent to the side surfaces 420S3 and 420S4 of one short side or two short sides. In Figure 9 the embodiment, the side surface 420S1 of one long side of the light guide plate 420 adjacent to which the light source 120_2 is disposed becomes the light incident surface (labeled as "420S1" in the drawings for convenience of explanation) where the light of the light source 120_2 directly enters, and the opposite side surface 420S2 of the other long side becomes the light output surface (labeled as "420S2" in the drawings for convenience of explanation).

[0142] The light source component 100_2 can include a substrate 110_2 and a plurality of light sources 120_2 disposed on the substrate 110_2. The light source 120_2 can be an LED package, but it is not limited thereto. The light source 120_2 can emit blue light. That is, the light emitted from the light source 120_2 can be light in the blue wavelength band. The light of the first wavelength band emitted from the light source 120_2 can enter the interior of the light guide plate 420 through the light incident surface 420S1 of the light guide plate 420.

[0143] It can be that the direction parallel to the light incident surface 420S1 and the light output surface 420S2 on the plane is the second direction DR2, and the direction perpendicular to the light incident surface 420S1 and the light output surface 420S2 on the plane is the first direction DR1. For example, the direction from the light incident surface 420S1 to the light output surface 420S2 can be the first direction DR1.

[0144] The light guide plate 420 may include an inorganic material. For example, the light guide plate 420 may be formed of glass, but is not limited thereto. In some embodiments, the light guide plate 420 may include an organic material. For example, the light guide plate 420 may be formed of poly(methyl methacrylate) (PMMA).

[0145] The light emitted from the light source 120_2 and incident on the incident surface 420S1 of the light guide plate 420 may be guided by the light guide plate 420 from the incident surface 420S1 toward the opposite light surface 420S2 side. In order to guide the incident light, total internal reflection may be formed on the upper surface 420US and the lower surface 420BS of the light guide plate 420. One of the conditions for total internal reflection to be formed in the light guide plate 420 is that the refractive index of the light guide plate 420 is greater than the refractive index of the medium forming the optical interface therewith. The lower the refractive index of the medium forming the optical interface with the light guide plate 420, the smaller the total reflection critical angle, and more total internal reflections can be formed.

[0146] A scattering pattern 421 may be disposed on the lower surface 420BS of the light guide plate 420. The scattering pattern 421 serves to change the traveling angle of the light traveling in total reflection inside the light guide plate 420 and cause it to be emitted to the outside of the light guide plate 420.

[0147] The scattering pattern 421 may be provided as an additional layer or pattern. For example, a pattern layer including a convex pattern and / or a groove pattern may be formed on the lower surface 420BS of the light guide plate 420 or a printed pattern may be formed so as to function as the scattering pattern 421.

[0148] The scattering pattern 421 may also be formed as the surface shape of the light guide plate 420 itself. For example, grooves may be formed on the lower surface 420BS of the light guide plate 420 so as to function as the scattering pattern 421.

[0149] The arrangement density of the scattering pattern 421 may vary according to regions. For example, the arrangement density may be small in the region adjacent to the incident surface 420S1 where the amount of traveling light is relatively large, and large in the region adjacent to the opposite light surface 420S2 where the amount of traveling light is relatively small.

[0150] A reflective layer 200 may be disposed below the light guide plate 420. The reflective layer 200 may be disposed overlapping the light guide plate 420 in the third direction DR3. The reflective layer 200 may be disposed so as not to overlap the light source component 100_2 in the third direction DR3.

[0151] The reflective layer 200 disposed below the light guide plate 420 serves to reflect at least a part of the light that passes through the light guide plate 420 and travels toward the reflective layer 200 side back toward the light guide plate 420 side.

[0152] The reflective layer 200 may include a plurality of opening patterns 210H. The plurality of opening patterns 210H may be formed to penetrate the reflective layer 200. Each opening pattern 210H may be arranged spaced apart from each other.

[0153] The wavelength conversion layer 500 may be disposed above the light guide plate 420. The wavelength conversion layer 500 functions to convert the wavelength of at least a part of the light emitted from the light guide plate 420 toward the display panel 70 side.

[0154] The optical sheet 600 may be disposed above the wavelength conversion layer 500.

[0155] The chassis 800 may function to house the components of the above-described backlight unit 10_2.

[0156] The chassis 800 is open on one side and includes a bottom surface portion 810 and side walls 820 connected to the bottom surface portion 810. The light correction material layer 300_2, the reflective layer 200, the light guide plate 420, the light source component 100_2, the wavelength conversion layer 500, and the optical sheet 600 may be sequentially disposed from the bottom surface portion 810 within the space defined by the bottom surface portion 810 and the side walls 820 of the chassis 800.

[0157] The light source component 100_2 may be fixed to the side wall 820 of the chassis 800 using an additional coupling component.

[0158] Hereinafter, with reference to Figures 10 to 13 ,, a detailed description will be given of Figure 9 the relative positional relationship among the bottom surface portion 810, the light correction material layer 300_2, and the reflective layer 200 of the backlight unit 10_2 shown in

[0159] The bottom surface portion 810 may include a central portion 811 and a peripheral portion 812. The peripheral portion 812 may be disposed on one side in the first direction DR1 of the central portion 811. The peripheral portion 812 may be a region adjacent to the side wall 820 opposite to the side wall 820 to which the light source component 100_2 is fixed. The area of the peripheral portion 812 on the plane may be smaller than the area of the central portion 811.

[0160] The reflective layer 200 may be disposed on the bottom surface portion 810. The reflective layer 200 may be disposed on the central portion 811 and the peripheral portion 812 of the bottom surface portion 810. The reflective layer 200 may expose a part of the region of the central portion 811 in the third direction DR3. The reflective layer 200 may not overlap with the light source component 100_2 in the third direction DR3.

[0161] A plurality of opening patterns 210H may be formed on one side of the reflective layer 200 in the first direction DR1. The plurality of opening patterns 210H may be formed in the reflective layer 200 disposed on the peripheral portion 812. The plurality of opening patterns 210H may be formed in a region adjacent to the side wall 820 adjacent to the side wall 820 opposite to the side wall 820 to which the light source component 100_2 is fixed.

[0162] The plurality of opening patterns 210H may be arranged at intervals from each other. The arrangement density of each opening pattern 210H may increase as it goes in the first direction DR1. Here, the first direction DR1 may be the direction in which the light-facing surface 420S2 faces the light-incident surface 420S1. The density of the light correction material layer 300_2 exposed by the reflective layer 200 may be adjusted by adjusting the arrangement density of the plurality of opening patterns 210H.

[0163] The planar areas of the plurality of opening patterns 210H may be different from each other. For example, the planar area of each opening pattern 210H may increase as it goes in the first direction DR1.

[0164] A light correction material layer 300_2 may be interposed between the peripheral portion 811 and the reflective layer 200. The light correction material layer 300_2 may be disposed on the upper surface of the peripheral portion 811. The light correction material layer 300_2 may be disposed entirely on the upper surface of the peripheral portion 811. The light correction material layer 300_2 may not overlap with the light source component 100_2 in the thickness direction.

[0165] The light correction material layer 300_2 may include an upper surface and a lower surface. That is, the upper surface of the light correction material layer 300_2 may be in contact with the lower surface of the reflective layer 200, and the lower surface of the light correction material layer 300_2 may be in contact with the upper surface of the peripheral portion 811.

[0166] At least a part of the region of the light correction material layer 300_2 may be exposed to the third direction DR3 by the plurality of opening patterns 210H. The planar area of the light correction material layer 300_2 exposed by the plurality of opening patterns 210H may increase as it goes in the first direction DR1.

[0167] The backlight unit 10_2 according to the present embodiment may coat the light correction material layer 300_2 in an adjacent region on the other side opposite to the side on which the light source component 100_2 is disposed. The area of the light correction material layer 300_2 exposed to the third direction DR3 may be adjusted by the arrangement density of the plurality of pattern openings 210H penetrating the reflective layer 200 disposed on the light correction material layer 300_2. Therefore, by using the opening pattern 210H of the reflective layer 200 to adjust the arrangement density of the light correction material layer 300_2, it is possible to design the arrangement density of the light correction material layer 300_2 differently according to the material of the reflective layer 200 in the manufacturing process, and thus the manufacturing process efficiency can be increased.

[0168] Figure 14 is a configuration diagram showing another example of the relative arrangement of the light source component, chassis, and light correction material layer of the backlight unit shown in Figure 9 . Figure 15 is a configuration diagram showing another example of the relative arrangement of the light source component, chassis, and reflection layer of the backlight unit shown in Figure 9 .

[0169] Referring to Figure 14 and Figure 15 , the bottom surface portion 810_1 may include a central portion 811_1 and a peripheral portion 812_1. In the present embodiment, the peripheral portion 812_1 may be disposed outside the central portion 811_1 and may be disposed above, to the right, and to the left of the central portion 811_1.

[0170] The light correction material layer 300_3 may be disposed entirely on the upper surface of the peripheral portion 812_1. Accordingly, the light correction material layer 300_3 may be disposed above, to the right, and to the left of the bottom surface portion 810_1 on a plane. The light correction material layer 300_3 may not be disposed on the lower side of the bottom surface portion 810_1 that overlaps with the light source component 100_2.

[0171] A plurality of opening patterns 210H may be disposed on the peripheral portion 812_1. The opening patterns 210H may be formed at the upper, right, and left edge portions of the reflection layer 200.

[0172] As described above, embodiments of the present invention have been described with reference to the accompanying drawings. However, those of ordinary skill in the art to which the present invention pertains should understand that the present invention may be implemented in other specific manners without changing its technical concept or essential features. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive.

Claims

1. A backlight unit, comprising a central region and a peripheral region disposed outside the central region, wherein, the backlight unit comprises: a chassis; a plurality of light sources, disposed on one surface of the chassis and emitting light in a first wavelength band; a reflective layer, disposed on one surface of the chassis and including a plurality of light source insertion holes and a plurality of opening patterns; and a light correction material layer, disposed between the chassis and the reflective layer in the peripheral region and including a material that absorbs the light in the first wavelength band or a material that converts the light in the first wavelength band into light in a second wavelength band different from the first wavelength band, the plurality of light source insertion holes expose each of the light sources, the plurality of opening patterns are disposed in the peripheral region and expose at least a part of the light correction material layer in the thickness direction.

2. The backlight unit according to claim 1, wherein, the plurality of opening patterns are spaced apart from each other, and the arrangement density of the plurality of opening patterns decreases in a direction from the peripheral region to the central region.

3. The backlight unit according to claim 2, wherein, the planar area of each of the opening patterns decreases in a direction from the peripheral region to the central region, and the planar area of the light correction material layer exposed by each of the opening patterns decreases in a direction from the peripheral region to the central region.

4. The backlight unit according to claim 1, wherein, the light source emits blue light, and the light correction material layer includes a material that converts the blue light into yellow light.

5. The backlight unit according to claim 1, wherein, the opening patterns and the light source insertion holes are spaced apart from each other.

6. The backlight unit according to claim 1, wherein, each of the light source insertion holes surrounds each of the light sources, and the thickness of the reflective layer is less than the thickness of the light source.

7. The backlight unit according to claim 1, wherein, the light source insertion holes include: at least one first light source insertion hole, disposed in the peripheral region; and at least one second light source insertion hole, disposed in the central region, and the first light source insertion hole exposes at least a part of the light correction material layer.

8. The backlight unit according to claim 1, wherein, the backlight unit further includes a substrate disposed between the chassis and the reflective layer, the substrate includes: one surface facing the reflective layer; and the other surface, which is a surface opposite to the one surface, and the light sources are disposed on the one surface of the substrate.

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