KR101707579B1 - backlight unit and display apparatus thereof - Google Patents

Abstract

The present invention includes a first layer, a plurality of light sources disposed on the first layer, and a second layer disposed on the first layer on which the plurality of light sources are disposed, A second light source disposed adjacent to the first light source and disposed on the same horizontal line as the first light source and emitting light in the same direction as the first light source and a second light source disposed adjacent to the first light source, And a third light source disposed between the first light source and the second light source and disposed diagonally to the first light source and emitting light in a direction opposite to the first light source, And the third light source has a first distance that is a distance between a light emitting surface of the first light source and an opposite surface of the light emitting surface of the second light source and the center of the light emitting surface of the first light source, The second distance, the distance between the centers of the faces Is, the first distance is related to it is, the backlight unit than the second distance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a backlight unit,

The present invention relates to a backlight unit and a display device.

Liquid crystal display devices are widely used in various fields such as notebook PC and monitor market due to advantages such as small size, light weight and low power consumption.

A liquid crystal display device includes a liquid crystal panel and a backlight unit. The backlight unit provides light to the liquid crystal panel, and the light passes through the liquid crystal panel. At this time, the liquid crystal panel adjusts the transmittance of light to realize an image.

The backlight unit can be divided into an edge type and a direct type depending on the type of the light source. In the edge type, a light source is disposed on a side surface of the liquid crystal panel, and a light guide plate is disposed on a back surface of the liquid crystal panel to guide light provided on a side surface of the liquid crystal panel to a back surface of the liquid crystal panel. The direct type liquid crystal panel has a plurality of light sources on the back surface of the liquid crystal panel and the light emitted from the plurality of light sources can be directly provided to the back surface of the liquid crystal panel.

Examples of such light sources include electro luminescence (EL), cold cathode fluorescent lamp (CCFL), hot cathode fluorescent lamp (HCFL), and light emitting diode (LED). Of these, LEDs can have advantages of low power consumption and excellent luminous efficiency.

The present invention provides an optical assembly, a backlight unit having the same, and a display device capable of improving the image quality of a display image and reducing the thickness thereof.

In order to achieve the above object, a backlight unit according to an embodiment of the present invention includes a first layer, a plurality of light sources disposed on the first layer, and a plurality of light sources disposed on the first layer on which the plurality of light sources are disposed Wherein the plurality of light sources include a first light source that emits light in one direction, a second light source that is disposed adjacent to the first light source and is disposed on the same horizontal line as the first light source, A second light source that emits light in the same direction as the first light source, and a second light source that is disposed between the first light source and the second light source and is disposed on a diagonal line with the first light source and emits light in a direction opposite to the first light source Wherein the first light source, the second light source, and the third light source have a first distance that is a distance between a light emitting surface of the first light source and an opposite surface of the light emitting surface of the second light source, The light emitting surface of the first light source Have a center-to-center distance, the second distance between the light emitting surface of the third light source, the first distance may be less than or equal to the second distance.

The plurality of light sources include a fourth light source that emits light in the same direction as the second light source and is disposed on a line perpendicular to the direction in which the light of the second light source is emitted and perpendicular to the second light source .

And the third light source may be disposed between the second light source and the fourth light source.

The third light source may be disposed on a horizontal line bisecting a distance between the second light source and the fourth light source.

The third light source may be disposed in a direction opposite to a direction in which the light of the second light source is emitted with respect to a line perpendicular to the second light source.

The third light source may be disposed adjacent to a line perpendicular to the second light source.

The light emitting surface of the second light source and the light emitting surface of the third light source may be arranged on the same vertical line.

Also, a display device according to an embodiment of the present invention includes a first layer, a plurality of light sources disposed on the first layer, and a second layer disposed on the first layer on which the plurality of light sources are disposed Wherein the plurality of light sources include a first light source that emits light in one direction, a second light source disposed adjacent to the first light source and disposed on the same horizontal line as the first light source, And a third light source disposed between the first light source and the second light source and disposed diagonally with the first light source and emitting light in a direction opposite to the first light source, And the first light source, the second light source, and the third light source have a first distance that is a distance between a light emitting surface of the first light source and a light emitting surface of the second light source, Plane and the third light Wherein the first distance comprises a backlight unit less than or equal to the second distance and a display panel located on the backlight unit, the backlight unit comprising a plurality of blocks, And can be driven by the divided blocks.

The display panel is divided into a plurality of regions, and the brightness of light emitted from a block of the backlight unit corresponding to the region can be adjusted according to a gray level peak value or a color coordinate signal of each of the plurality of regions.

The backlight unit according to the embodiment of the present invention can reduce the thickness of the display device and can improve the appearance while simplifying the manufacturing process of the display device by bringing the backlight unit into close contact with the display panel.

Further, by disposing the plurality of light sources so as to emit light in mutually different directions, and arranging them in the backlight unit by adjusting their arrangement, light of uniform luminance can be provided to the display panel, Can be improved.

1 and 2 show a display device according to an embodiment of the present invention.
3 illustrates a display module according to one embodiment of the present invention.
4 to 6 are views showing a backlight unit according to a first embodiment of the present invention.
7 illustrates a backlight unit according to a second embodiment of the present invention.
8 is a view illustrating a backlight unit according to a third embodiment of the present invention.
9 to 15 are views showing a backlight unit according to a fourth embodiment of the present invention,
16 to 19 are views showing the arrangement of a first pattern formed on a backlight unit according to an embodiment of the present invention.
20 to 23 are views showing the shape of the first pattern of the present invention.
24 and 25 show a backlight unit according to a fifth embodiment of the present invention.
26 shows a display device according to a sixth embodiment of the present invention.
27 and 28 are sectional views for explaining the positional relationship between the light source and the reflective layer provided in the backlight unit;
29 to 32 are views showing a structure of a light source provided in a backlight unit.
33 is a view showing a structure of a plurality of light sources provided in the backlight unit;
34 to 44 are views showing a front surface shape of a backlight unit according to a seventh embodiment of the present invention.
45 and 46 are views showing a structure of a reflective layer provided in a backlight unit according to an eighth embodiment of the present invention.
47 shows a backlight unit according to a ninth embodiment of the present invention.
Figure 48 shows a display device according to the present invention.

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

1 and 2 show a display device according to an embodiment of the present invention.

1, a display device 1 according to an embodiment of the present invention includes a display module 20, a front cover 30 and a back cover 35 surrounding the display module 20, a back cover 35 And a driving unit cover 40 that surrounds the driving unit 55.

The front cover 30 may include a front panel (not shown) made of a transparent material transmitting light. The front panel may protect the display module 20 at regular intervals, and light emitted from the display module 20 So that an image displayed on the display module 20 is displayed from the outside.

Further, the front cover 30 can be made of a flat plate without the window 30a. In this case, the front cover 30 is made of a transparent material that transmits light, for example, an injection-molded plastic. Thus, if the front cover 30 is formed as a flat plate, the frame can be removed from the front cover 30. [ The back cover 35 can be coupled with the front cover 30 to protect the display module 20.

A driving unit 55 may be disposed on one side of the back cover 35. The driving unit 55 may include a driving control unit 55a, a main board 55b, and a power supply unit 55c. The driving control unit 55a may be a timing controller and is a driving unit for adjusting the operation timing of each driver IC of the display module 20. The main board 55b may include a V-sync, an H- B resolution signal, and the power supply unit 55c is a driving unit for applying power to the display module 20. [

The driving unit 55 may be provided on the back cover 35 and may be surrounded by the driving unit cover 40. The back cover 35 is provided with a plurality of holes so that the display module 20 and the driving unit 55 can be connected. A stand 60 for supporting the display device 1 may be provided.

2, the driving control unit 55a of the driving unit 55 is provided in the back cover 35, and the main board 55b and the power board 55c may be provided in the stand 60 have. The driving unit cover 40 may cover only the driving unit 55 provided on the back cover 35.

Although the main board 55b and the power board 55c are separately formed in the present embodiment, they may be formed as one integrated board, but are not limited thereto.

3 is a view illustrating a display module according to an embodiment of the present invention.

The display module 20 may include a display panel 100 and a backlight unit 200.

The display panel 100 includes a color filter substrate 110 and a TFT (Thin Film Transistor) substrate 120 bonded to each other so as to maintain a uniform cell gap, and between the two substrates 110 and 120 A liquid crystal layer (not shown) may be interposed.

The color filter substrate 110 includes a plurality of pixels composed of red (R), green (G), and blue (B) subpixels and generates an image corresponding to red, green, .

The pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel.

The TFT substrate 120 can switch pixel electrodes (not shown) as elements having switching elements formed thereon. For example, the common electrode (not shown) and the pixel electrode can change the arrangement of molecules in the liquid crystal layer according to a predetermined voltage applied from outside.

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules change their arrangement in accordance with the voltage difference generated between the pixel electrode and the common electrode. Thus, the light provided from the backlight unit 200 can be incident on the color filter substrate 110 in accordance with the change in the molecular arrangement of the liquid crystal layer.

The upper polarizer 130 and the lower polarizer 140 may be disposed on the upper and lower sides of the display panel 100. More specifically, the upper polarizer 130 may be disposed on the upper surface of the color filter substrate 110 And the lower polarizer 140 may be disposed on the lower surface of the TFT substrate 120.

Although not shown, a gate and a data driver for generating a driving signal for driving the panel 100 may be provided on a side surface of the display panel 100.

As shown in FIG. 3, the display module according to an embodiment of the present invention can be configured by closely attaching the backlight unit 200 to the display panel 100.

For example, the backlight unit 200 may be adhered and fixed to the lower surface of the display panel 100, more specifically, to the lower polarizer 140, and the lower polarizer 140 and the backlight unit 200 An adhesive layer (not shown) may be formed.

As described above, by forming the backlight unit 200 in close contact with the display panel 100, it is possible to improve the appearance by reducing the overall thickness of the display device, and the additional structure for fixing the backlight unit 200 can be removed So that the structure and manufacturing process of the display device can be simplified.

Also, by removing the space between the backlight unit 200 and the display panel 100, it is possible to prevent a malfunction of the display device or deterioration of the display quality of the display image due to the penetration of foreign matter into the space.

The backlight unit 200 according to an exemplary embodiment of the present invention may be configured as a stack of a plurality of functional layers, and at least one layer of the plurality of functional layers may include a plurality of light sources (not shown) have.

The plurality of functional layers constituting the backlight unit 200, more specifically, the backlight unit 200, are each flexible so that the backlight unit 200 is closely attached to the lower surface of the display panel 100 and fixed. ). ≪ / RTI >

The display panel 100 according to an exemplary embodiment of the present invention may be divided into a plurality of regions and may be divided into a plurality of regions corresponding to a gray peak value or a color coordinate signal of each of the divided regions from a corresponding region of the backlight unit 200 The brightness of the emitted light, that is, the brightness of the corresponding light source is adjusted, so that the brightness of the display panel 100 can be adjusted.

To this end, the backlight unit 200 may be divided into a plurality of divided driving regions corresponding to the respective divided regions of the display panel 100 and operated.

4 and 5 are views showing a backlight unit according to the first embodiment of the present invention.

Referring to FIG. 4, the backlight unit 200 according to the first embodiment of the present invention may include a first layer 210, a light source 220, a second layer 230, and a reflective layer 240.

A plurality of light sources 220 may be formed on the first layer 210 and a second layer 230 may be disposed on the first layer 210 to surround the plurality of light sources 220 .

The first layer 210 may be a substrate on which a plurality of light sources 220 are mounted and may include an electrode pattern (not shown) for connecting an adapter (not shown) . For example, a carbon nanotube electrode pattern (not shown) for connecting the light source 220 and an adapter (not shown) may be formed on the upper surface of the substrate.

The first layer 210 may be a printed circuit board (PCB) on which a plurality of light sources 220 are mounted, such as polyethylene terephthalate (PET), glass, polycarbonate (PC) , Or in the form of a film.

The light source 220 may be one of a light emitting diode (LED) chip or a light emitting diode package having at least one light emitting diode chip. In this embodiment, the light source 220 is a light emitting diode package.

The light source 220 according to an exemplary embodiment of the present invention may be divided into a top view mode and a side view mode according to a direction in which the light emitting surface faces. A top view type LED package in which a light emitting surface is formed upward and a side view type LED package in which a light emitting surface is formed in a side surface.

In the present embodiment, a case where the light source 220 is a side view type LED package will be described. Each of the plurality of light sources 220 has a light emitting surface disposed on a side surface thereof, The light guide plate 240 can emit light in the extended direction. Accordingly, the thickness e of the second layer 230 formed on the light source 220 can be reduced to realize the slimming of the backlight unit 200, and further, the display device.

In addition, the light source 220 may be a colored LED or a white LED that emits at least one color among colors such as red, blue, green, and the like. In addition, the colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of the LED may be variously changed and applied.

The second layer 220 disposed on the first layer 210 and surrounding the plurality of light sources 220 transmits and diffuses the light emitted from the light source 220, 220 may be uniformly provided to the display panel 100. [0050] FIG.

A reflective layer 240 may be disposed on the first layer 210 to reflect light emitted from the light source 220. The reflective layer 240 may be formed in an area other than a region where the light source 220 on the first layer 210 is formed. The reflective layer 240 reflects the light emitted from the light source 220 and reflects the light totally reflected from the boundary of the second layer 230 to spread the light more widely.

The reflective layer 240 may include at least one of a metal or a metal oxide as a reflective material and may have a high reflectance such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ) Or a metal oxide.

In this case, the reflective layer 240 may be formed by depositing or coating the metal or metal oxide on the first layer 210, or may be formed by printing metal ink. Here, as the deposition method, a vacuum deposition method such as a thermal deposition method, an evaporation method, or a sputtering method can be used. As the coating or printing method, a printing method, a gravure coating method, or a silk screen method can be used.

Meanwhile, the second layer 230 located on the first layer 210 may be made of a light transmitting material, for example, silicon or acrylic resin. However, the second layer 230 is not limited to the above materials and may be made of various resins.

The second layer 230 may be formed of a resin having a refractive index of about 1.4 to 1.6 so that light emitted from the light source 220 is diffused and the backlight unit 200 has a uniform brightness. For example, the second layer 230 may be formed of a material selected from the group consisting of polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyepoxy And the like.

The second layer 230 may include a polymer resin having adhesion so as to firmly adhere to the light source 220 and the reflective layer 240. For example, the second layer 230 may comprise at least one of an unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, n-butyl methyl methacrylate, Hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methylol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, 2 -Ethylhexyl acrylate polymer, a copolymer or a terpolymer, and the like, acrylic, urethane, epoxy, melamine and the like.

The second layer 230 may be formed by applying a liquid or gel resin on the first layer 210 on which the plurality of light sources 220 and the reflective layer 240 are formed and curing the resin, It may be formed by applying a resin on the sheet and then partially curing it and adhering it on the first layer 210.

Referring to FIG. 5, a diffusion plate 245 may be provided on the second layer 230 so that light emitted from the light sources 220 may be diffused upward. The diffuser plate 245 may be adhered to the second layer 230 and adhered using an additional adhesive member.

In the backlight unit 200 of the present invention configured as described above, the thickness range can be adjusted for efficient use of light provided to the display panel.

More specifically, the total thickness a of the backlight unit 200 may be 1.7 to 3.5 mm, and may be 2.8 mm, for example. The thickness (b) of the first layer 210 constituting the backlight unit 200 may be 0.2 to 0.8 mm, for example, 0.5 mm. The thickness c of the reflective layer 240 formed on the first layer 210 may be 0.02 to 0.08 mm, for example, 0.05 mm.

In addition, the thickness d of the light source 220 arranged on the first layer 210 may be 0.8 to 1.6 mm, for example, 1.2 mm. The thickness e of the second layer 230 covering the light source 220 may be 0.8 to 2.4 mm, for example, 1.3 mm. The thickness f of the diffusion plate 245 formed on the second layer 230 may be 0.7 to 1.3 mm, for example, 1.0 mm.

Here, as the thickness e of the second layer 230 increases, the light emitted from the light source 220 is diffused more widely, so that light of a uniform brightness from the backlight unit 200 can be provided to the display panel. On the other hand, as the thickness e of the second layer 230 increases, the amount of light absorbed in the second layer 230 may increase, and thus the brightness of the light provided from the backlight unit 200 to the display panel Can be reduced overall.

The thickness e of the second layer 230 is set to be less than the thickness e of the light source 220 in order to provide light of uniform brightness without significantly reducing the brightness of the light provided to the display panel from the backlight unit 200. [ d or not more than 1.5 times the thickness d of the light source 220. [

6 illustrates a cross-sectional shape of a region of the backlight unit 200 where the light sources 220 are not located. In the structure of the backlight unit 200 shown in FIG. 6, The explanation will be omitted below.

34, the cross-sectional view shown in FIG. 4 shows a cross-sectional configuration in which the light sources 220 of the backlight unit 200 are located along the line A-A ' And the cross-sectional view shown in FIG. 6 may show a cross-sectional configuration in which a region where the light sources 220 are not located in the backlight unit 200 is cut along the line B-B '.

Referring to FIG. 6, the reflective layer 240 may cover the upper surface of the first layer 210 in a region of the backlight unit 200 where the light sources 220 are not located.

For example, the reflective layer 240 is formed on the first layer 210, and the holes, through which the light sources 220 can be inserted, are formed in regions of the reflective layer 240 corresponding to the light sources 220 And the light sources 220 may protrude upward through the holes of the reflective layer 240 and may be surrounded by the second layer 230.

7 is a view illustrating a backlight unit according to a second embodiment of the present invention. In the following description, the same reference numerals are given to the same components as those in the first embodiment described above, and a description thereof will be omitted.

Referring to FIG. 7, a plurality of light sources 220 may be mounted on a first layer 210, and a second layer 230 may be disposed on a first layer 210. Meanwhile, a reflective layer 240 may be formed between the first layer 210 and the second layer 230, more specifically, on the upper surface of the first layer 210.

The second layer 230 may include a plurality of scattering particles 231. The scattering particles 231 may scatter or refract incident light so that light emitted from the light source 220 may be diffused more widely .

The scattering particles 231 may be formed of a material having a refractive index different from that of the material constituting the second layer 230, more particularly, a second layer 230 to scatter or refract light emitted from the light source 220 Based resin or a material having a refractive index higher than that of the acrylic-based resin.

For example, the scattering particles 231 may be selected from the group consisting of polymethylmethacrylate / styrene copolymer (MS), polymethyl methacrylate (PMMA), polystyrene (PS), silicon, titanium dioxide (TiO ₂ ) SiO ₂ ), or the like, and may be formed by combining the above materials.

The scattering particles 231 may be formed of a material having a refractive index lower than that of the material constituting the second layer 230. For example, the scattering particles 231 may be formed by forming a bubble in the second layer 230 It is possible. In addition, the material constituting the scattering particles 231 is not limited to the above-described materials, and may be formed using various polymer materials or inorganic particles.

The optical sheet 250 may include at least one prism sheet 251 and / or at least one diffusion sheet 252. The optical sheet 250 may be disposed on the second layer 230, can do.

In this case, the plurality of sheets included in the optical sheet 250 may be provided in an adhered or closely adhered state without being separated from each other, so that the thickness of the optical sheet 250 or the backlight unit 200 may be reduced.

The lower surface of the optical sheet 250 is in close contact with the second layer 230 and the upper surface of the optical sheet 250 is in close contact with the lower surface of the display panel 100 such as the lower polarizer 140 .

The diffusion sheet 252 diffuses the incident light to prevent the light from the second layer 230 from being partially concentrated, thereby making the brightness of the light more uniform. The prism sheet 251 condenses the light emitted from the diffusion sheet 252 and allows light to be vertically incident on the display panel 100.

According to another embodiment of the present invention, at least one of the optical sheet 250 as described above, e.g., the prism sheet 251 and the diffusion sheet 252, may be removed, or the prism sheet 251 and / And may further include various functional layers other than the diffusion sheet 252. [

A plurality of holes (not shown) may be formed in the reflective layer 240 at positions corresponding to the plurality of light sources 220. A plurality of light sources (not shown) mounted on the lower substrate 210 220 may be inserted.

In this case, the light sources 220 may be inserted from below through the holes formed in the reflection layer 240, and at least a part of the light sources 220 may protrude upward from the reflection layer 240. The backlight unit 200 may be formed by using the structure in which the light sources 220 are inserted into the holes of the reflection layer 240 so that the distance between the substrate 210 on which the light sources 220 are mounted and the reflection layer 240 It is possible to further improve the fixability.

8 is a view illustrating a backlight unit according to a third embodiment of the present invention. In the following description, the same constituent elements as those of the first and second embodiments are denoted by the same reference numerals, and a description thereof will be omitted.

8, a plurality of light sources 220 provided in the backlight unit 200 are arranged such that light-emitting surfaces are respectively disposed on the lateral sides, and the lateral direction, for example, the first layer 210 or the reflective layer 240, It is possible to emit light in the direction in which it is emitted.

For example, the plurality of light sources 220 may be configured using a side view LED package, thereby reducing the possibility that the light source 220 is viewed as a hot spot on the screen, The thickness a of the second layer 230 can be reduced to realize the slimming of the backlight unit 200, and further, the display device.

In this case, the light source 220 may emit light having a predetermined directivity angle (?) Around the first direction (x), for example, a directivity angle of 90 to 150 degrees. Hereinafter, the direction of light emitted from the light source 220 will be described in the first direction (x).

According to an embodiment of the present invention, a pattern may be formed on the second layer 230 to reflect and diffuse the light emitted upward from the light source 220, so that uniform light from the backlight unit 200 So that light of a luminance can be emitted.

9 to 14 are views showing a backlight unit according to a fourth embodiment of the present invention. In the following description, the same reference numerals are given to the same constituent elements as in the first to third embodiments described above, and the description thereof will be omitted.

The plurality of light sources 220 shown in Figs. 9 to 14 may emit light in a lateral direction from the side surface of the light source as shown in Fig. 8, but the present invention is not limited thereto. For example, Lt; / RTI >

9, a pattern layer including a plurality of first patterns 232 may be formed on the second layer 230 of the backlight unit 200 including the light sources 220, The plurality of first patterns 232 included in the pattern layer may be formed on the second layer 230 so as to correspond to the positions where the light sources 220 are disposed.

For example, the first pattern 232 formed on the second layer 230 may be a reflection pattern reflecting at least a part of the light emitted from the light source 220.

The first pattern 232 may be formed on the second layer 230 to reduce the brightness of light emitted from the region adjacent to the light source 220 so that light of a uniform brightness is emitted from the backlight unit 200 .

That is, the first pattern 232 is formed on the second layer 230 so as to correspond to the positions where the plurality of light sources 220 are disposed, selectively reflects light emitted upward from the light source 220, It is possible to reduce the brightness of light emitted from the region adjacent to the reflective region 220, and the reflected light can be diffused in the lateral direction.

More specifically, the light emitted upward from the light source 220 is diffused in the lateral direction by the first pattern 232 and is reflected in the downward direction, and the light reflected by the first pattern 232 is reflected by the reflective layer The light is diffused again in the lateral direction by the light guide 240 and can be reflected upward. That is, the first pattern 232 may reflect 100% of incident light, reflect a part of incident light, and pass a part thereof. As such, the characteristics of the first pattern 232 can be adjusted by controlling the transmission of light through the second layer 230 and the first pattern 232.

Accordingly, the light emitted from the light source 220 can be widely diffused in the lateral direction and the other directions without concentrating on the upper side, whereby light of a more uniform luminance can be emitted from the backlight unit 200.

The first pattern 232 may include a reflective material such as a metal or the like and may include a metal having a reflectance of 90% or more such as aluminum, gold or gold. For example, the first pattern 232 may be configured to have a material or shape that allows less than about 10% of the total incident light to pass through and the remainder to be reflected.

In this case, the first pattern 232 may be formed by vapor-depositing or coating the metal as described above. Alternatively, a reflective ink containing a metal, for example, a silver ink The first pattern 232 may be formed.

Further, in order to improve the reflection effect of the first pattern 232, the color of the first pattern 232 may have a high-brightness color, for example, a color close to white, and more specifically, 230). ≪ / RTI >

Meanwhile, the first pattern 232 may include a metal oxide, for example, titanium dioxide (TiO ₂ ). More specifically, the reflective ink containing titanium dioxide (TiO ₂ ) may be printed according to a predetermined pattern to form the first pattern 232.

10 to 14, the plurality of first patterns 232 are formed so as to correspond to the positions of the light sources 220, respectively. As shown in FIG. 9, The center portion of the first pattern 232 may be formed to be spaced apart from the center portion of the light source 220 corresponding to the central portion of the light source 220 corresponding to the center of the corresponding light source 220. [ have.

10, the center portion of the first pattern 232 may not coincide with the center portion of the light source 220 corresponding to the first pattern 232. In other words, as shown in FIG.

For example, when light is emitted in the lateral direction toward the lateral direction other than the upward direction, the light emitted from the side surface of the light source 220 is emitted in the direction indicated by the arrow in FIG. 2 layer 230. In this case, Accordingly, the first region immediately adjacent to the light emitting surface of the light source 220 may have a higher brightness of light than the surrounding region, while a second region adjacent to the direction of the light emitting surface has a brightness of the light, ≪ / RTI > Accordingly, the first pattern 232 may be formed by moving in the direction in which the light is emitted from the light source 220.

Accordingly, the central portion of the first pattern 232 may be formed at a position slightly offset from the central portion of the corresponding light source 220 in the direction in which the light is emitted.

Referring to FIG. 11, the first pattern 232 may be formed at a more inclined position in the direction in which light is emitted than in the case shown in FIG.

That is, the distance between the center of the first pattern 232 and the center of the corresponding light source 220 may increase more than the case shown in FIG. 10, for example, as shown in FIG. 11, And the left end portion of the first pattern 232 are overlapped with each other.

Referring to FIG. 12, the first pattern 232 may be formed at a more inclined position in a direction in which light is emitted than in the case shown in FIG. 12, the region where the first pattern 232 is formed and the region where the light source 220 corresponding to the first pattern 232 are formed may not overlap with each other. Thus, the left end of the first pattern 232, May be formed spaced apart from the light emitting surface of the light source 220 by a predetermined distance.

Also, as shown in FIG. 13, the first pattern 232 may be formed inside the second layer 230. In this case, the center portion of the first pattern 232 may be formed at a position slightly offset from the central portion of the light source 220 corresponding to the center portion of the first pattern 232 as shown in FIG. 10 to FIG.

14, the first pattern 232 may be formed in a sheet form. In this case, a pattern layer including a plurality of first patterns 232 may be formed on the second layer 230 .

For example, a plurality of first patterns 232 are formed on one side of the transparent film 260 through printing or the like to form a pattern layer, and then a pattern layer including the transparent film 260 is formed on the second layer 230 ). ≪ / RTI > More specifically, the first pattern 232 may be formed by printing a plurality of dots on a transparent film.

Referring to FIG. 15, a plurality of first patterns 232 may be formed on one surface of the diffusion plate 245 illustrated in FIG. In this case, the first pattern 232 is coated on one surface of the diffusion plate 245, and the diffusion plate 245 is formed on the second layer 230 (230) so that the first pattern 232 contacts the second layer 230 ). ≪ / RTI >

On the other hand, as the ratio of the region in which the first pattern 232 is formed increases, the aperture ratio decreases, and the overall brightness of light supplied from the backlight unit 200 to the display panel 100 can be reduced. Here, the aperture ratio may indicate the amount of the region of the second layer 230 where the first pattern 232 is not formed.

Therefore, it is preferable that the aperture ratio of the pattern layer in which the first pattern 232 is formed is 70% or more, in order to prevent the luminance of the light provided to the display panel 100 from greatly decreasing, thereby lowering the image quality of the display image. That is, the area of the second layer 230 where the first pattern 232 is formed is preferably 30% or less of the entire area.

16 to 19 are views showing the arrangement of a first pattern formed on a backlight unit according to an embodiment of the present invention.

As described above, the first pattern 232 may be formed to correspond to the position of the light source 220.

Referring to FIG. 16, the first pattern 232 may be formed to have a circular or elliptical shape around a position where the corresponding light source 220 is formed. 10 to 12, the center portion of the first pattern 232 may be formed at a position that does not coincide with the central portion of the light source 220 corresponding thereto. Meanwhile, each of the first patterns 232 may have a different shape or size.

17, the first pattern 232 may be moved in a direction in which the light is emitted, that is, in the x-axis direction, so that the central portion of the first pattern 232 may correspond to the light source 220 corresponding thereto. May be spaced apart from each other in a direction in which light is emitted by a predetermined distance with reference to a position where the central portion of the light emitting portion is formed.

Referring to FIG. 18, the first pattern 232 may be further moved in a direction in which light is emitted than in the case shown in FIG. 17, so that only a part of the area where the light source 220 is formed The pattern 232 may be overlapped with the region where the pattern 232 is formed.

19, the first pattern 232 may be further moved in the direction in which the light is emitted than in the case shown in FIG. 18, and may be located outside the region where the light source 220 is formed, And the region where the first pattern 232 is formed may not overlap with each other.

20-23 illustrate embodiments of the shape of the first pattern 232, wherein the first pattern 232 may be comprised of a plurality of dots or regions, and each dot or area May comprise a reflective material, for example a metal or a metal oxide.

20, the first pattern 232 may have a circular shape (or may have another shape such as a rhombus shape) around the region where the light source 220 is formed, Reflectivity may decrease as it goes to the outer edge. The reflectivity of the first pattern 232 is greater at the center 234 than at the center 234 as the number of dots shown decreases from the center 234 to the outer region or the reflection characteristic of the material constituting the first pattern 232 decreases. It can be gradually decreased toward the outer area.

In addition, the transmittance or the aperture ratio of the first pattern 232 may increase as it goes from the center 234 to the outer periphery. The highest reflectance (for example, almost all the light is transmitted through the center portion 234 of the first pattern 232 corresponding to the position where the light source 220 is formed, more specifically, the center of the light source 220) And the light transmittance or the aperture ratio can be minimized. Thus, it is possible to more effectively prevent the hot spot from being generated due to the light being concentrated in the region where the light source 220 is formed.

For example, in order to prevent hot spot from occurring as described above, it is preferable that the aperture ratio of the central region overlapping the light source 220 in the first pattern 232 is 5% or less.

On the other hand, the distance between adjacent dots 233 in the plurality of dots 233 constituting the first pattern 232 may be increased from the center 234 to the outer side, 1 pattern 232 may be formed such that the reflectance decreases and the transmittance or the aperture ratio increases as the distance from the center 234 to the outer periphery increases.

21, the first pattern 232 may have an elliptical shape. Also, the center portion 234 of the first pattern 232 may be positioned to coincide with the center portion of the light source 220 corresponding thereto. Alternatively, the central portion 234 of the first pattern 232 and the central portion of the light source 220 may be formed at positions where they do not coincide with each other.

10 to 12, the central portion 234 of the first pattern 232 may be arranged in a direction slightly larger than the central portion of the light source 220 in a direction in which light is emitted from the light source 220, for example, And may be formed in a biased position.

In this case, the reflectance may decrease or the transmittance may increase from the portion 235 of the first pattern 232 corresponding to the center portion of the light source 220 to the outer portion. That is, the portion 235 of the first pattern 232 corresponding to the center of the light source 220 may be offset from the center portion 234 in one direction, And may have the highest reflectance or the lowest transmittance in the portion 235 corresponding to the light-emitting layer.

Referring to FIGS. 22 and 23, the first pattern 232 may have a quadrangular shape centered on a region where the light source 220 is formed, and the reflectance decreases as the distance from the center toward the outer periphery increases. can do. The features of the first pattern 232, as shown in Figs. 20 and 21, are equally applicable to the first pattern 232 shown in Figs. 22 and 23. Fig.

Also in this case, it is preferable that the aperture ratio of the central region overlapping the light source 220 among the first patterns 232 is 5% or less in order to prevent hot spots as described above.

22 and 23, the dots 233 forming the first pattern 232 may have an increased spacing between adjacent dots 233 from the center to the outer edge.

20 to 23, the first pattern 232 includes a plurality of dots. However, the present invention is not limited to this, and the reflectance decreases as the distance from the center to the periphery increases , Transmittance, or aperture ratio of the substrate.

For example, in the first pattern 232, the concentration of a reflective material such as a metal or a metal oxide may decrease as the distance from the center to the outer periphery increases, and as the distance from the center of the first pattern 232 increases toward the outer periphery, the reflectance decreases, It is possible to reduce concentration of light density in a region adjacent to the light source 220. [

24 and 25 are views showing a backlight unit according to a fifth embodiment of the present invention. In the following description, the same reference numerals are given to the same components as those in the first to fourth embodiments, and the description thereof will be omitted.

Referring to FIG. 24, the first pattern 232 may have a convex shape toward the light source 220, for example, the first pattern 232 may have a shape similar to a hemisphere. The cross-sectional shape of the first pattern 232 may have a semicircular or oval shape convex toward the light source 220.

As described above, the first pattern 232 having a convex shape can reflect incident light at various angles, thereby diffusing the light emitted to the light source 220 into a wide range, It is possible to make the luminance of the light emitted upward from the light-emitting layer more uniform.

The first pattern 232 may include a reflective material such as a metal or a metal oxide as described above. For example, a pattern may be formed on the upper surface of the second layer 230 at an obtuse angle, And filling the material with the engraved pattern. The first pattern 232 may also be formed by printing a reflective material on a sheet in the form of a film or by attaching beads or metal particles and then pressing the film onto the second layer 230, 230 as shown in Fig.

Meanwhile, the cross-sectional shape of the first pattern 232 may have various shapes convex toward the light source 220, in addition to a shape similar to a semicircle as shown in FIG.

25, the cross-sectional shape of the first pattern 232 may have a convex triangular shape in the direction of the light source 220. In this case, the first pattern 232 may have a pyramid shape or a prism shape. Shape.

26 and 27 are views showing a display device according to a sixth embodiment of the present invention. In the following description, the same reference numerals are given to the same constituent elements as in the first to fifth embodiments, and the description thereof will be omitted.

Referring to FIG. 26, light emitted from the light source 220 may be diffused by the second layer 230 and emitted upward. Also, the second layer 230 may include a plurality of scattering particles 231 to scatter or refract light emitted upward, thereby making the brightness of light emitted toward the upper side more uniform.

According to an embodiment of the present invention, a third layer 235 may be disposed above the second layer 230. The third layer 235 may be made of the same material as the second layer 230 or may be made of a material different from that of the second layer 230 to diffuse light emitted upward from the second layer 230, The uniformity can be improved.

The third layer 235 may be made of a material having the same refractive index as the material constituting the second layer 230, or may be made of a material having a different refractive index. For example, when the third layer 235 is composed of a material having a refractive index higher than that of the second layer 230, the light emitted from the second layer 230 can be diffused more widely. On the other hand, when the third layer 235 is made of a material having a refractive index lower than that of the second layer 230, the light emitted from the second layer 230 may improve the reflectance reflected from the lower surface of the third layer 235 So that light emitted from the light source 220 can more easily proceed along the second layer 230.

The third layer 235 may also include a plurality of scattering particles 236 wherein the density of the scattering particles 236 included in the third layer 235 may be greater than the density of the scattering particles 236 included in the second layer 230. [ May be higher than the density of the scattering particles 231 included.

As described above, by including scattering particles at a higher density in the third layer 235, light emitted upward from the second layer 230 can be diffused more widely, thereby emitting light from the backlight unit 200 It is possible to make the luminance of the light to be more uniform.

According to this embodiment, the first pattern 232 described above may be formed in at least one of the second layer 230 and the third layer 235 or between the second and third layers 230 and 235 have.

In addition, as shown in FIG. 26, another pattern layer, that is, a plurality of second patterns 265 may be formed on the third layer 235.

The second pattern 265 on the third layer 235 may be a reflective pattern that reflects at least a portion of the light emitted from the second layer 230, The luminance can be made uniform.

For example, when light emitted upward from the third layer 235 is focused on a specific portion and is observed at a high luminance on the screen, a portion of the upper surface of the third layer 235, 2 pattern 265 can be formed, thereby reducing the brightness of the light in the specific portion and making the brightness of the light emitted from the backlight unit 200 uniform.

The second pattern 265 formed on the third layer 235 may be made of titanium dioxide (TiO ₂ ). In this case, a part of the light emitted from the third layer 235 may be incident on the second pattern 265. And the remaining part of the light can be transmitted.

Referring to FIG. 27, the thickness h1 of the second layer 230 may be smaller than the height h3 of the light source 220. Referring to FIG. Accordingly, the second layer 230 surrounds a lower portion of the light source 220, and the third layer 235 surrounds an upper portion of the light source 220.

The second layer 230 may be made of a highly adhesive resin and may have a higher adhesive force than the third layer 235, for example. The light emitting surface of the light source 220 is more strongly adhered to the second layer 230 so that no space is formed between the light emitting surface of the light source 220 and the second layer 230.

As an embodiment of the present invention, the second layer 230 may be made of a silicone-based resin having high adhesion, and the third layer 235 may be made of an acryl-based resin. In this case, the refractive index of the second layer 230 may be greater than the refractive index of the third layer 230, and the refractive indexes of the second layer 230 and the third layer 230 may be 1.4 to 1.6, respectively. The thickness h2 of the third layer 235 may be smaller than the height h3 of the light source 220. [

28 is a view for explaining the positional relationship between the light source 220 and the reflective layer 240 provided in the backlight unit.

Referring to FIG. 28, as the reflective layer 240 is disposed on the side surface of the light source 220, a part of the light emitted to the side surface from the light source 220 may be incident on the reflective layer 240 and may be lost.

The loss of light emitted from the light source 220 reduces the amount of light incident on the second layer 230 and proceeds thereby reducing the amount of light provided to the display panel 100 from the backlight unit 200, Can be reduced.

The light source 220 includes a light emitting portion 222 through which light is emitted and the light emitting portion 222 may be positioned at a predetermined height c from the surface of the first layer 210.

The thickness c of the reflective layer 240 may be equal to or less than the height g of the light emitting portion 222 so that the light source 220 may be positioned above the reflective layer 240.

Therefore, the thickness c of the reflective layer 240 may be 0.02 mm to 0.08 nm or less. Here, if the thickness c of the reflective layer 240 is 0.02 mm or more, the reflective layer 240 can achieve a light reflectance in a range of reliability, and if the thickness c of the reflective layer 240 is 0.08 mm or less, The light emitting part 222 of the light source 220 is shielded, so that the light emitted from the light source 220 can be prevented from being lost.

The thickness c of the reflective layer 240 may be in the range of 10 nm to 200 nm so as to improve the incidence efficiency of the light emitted from the light source 220 and to reflect most of the light incident from the light source 220. [ 100 mu m.

29 to 32 are views showing the structure of a light source provided in the backlight unit. FIG. 29 shows the structure of the light source viewed from the side, and FIG. 31 shows the structure of the head portion of the light source viewed from the front.

29, the light source 220 includes a light emitting device 321 for emitting light, a mold unit 322 having a cavity 323, and a plurality of lead frames 324 and 325 .

The light emitting device 321 may be a light emitting diode chip, and the light emitting diode chip may be a blue LED chip or an ultraviolet LED chip, or may be a red LED chip, a green LED chip, a blue LED chip, green LED chips, and white LED chips.

The light emitting device 321 may be divided into a horizontal type and a vertical type according to the structure.

30 is a view showing a horizontal structure (a) and a vertical structure (b) of the light emitting element 321.

Referring to FIG. 30, a substrate 340 made of silicon or sapphire is located at the lowermost portion of the light emitting device a having a horizontal structure. The n-type semiconductor layer 341 may be positioned on the substrate 340, and the n-type semiconductor layer 341 may be formed of, for example, n-GaN.

The active layer 342 may be located on the n-type semiconductor layer 341, and the active layer 342 may be formed of, for example, InGaN. The p-type semiconductor layer 343 may be located on the active layer 342, and the p-type semiconductor layer 343 may be formed of, for example, p-GaN.

The p-type electrode 344 may be positioned on the p-type semiconductor layer 343 and the p-type electrode 344 may include at least one of chromium, nickel, or gold, for example. In addition, the n-type electrode 345 may be positioned on the n-type semiconductor layer 341 and the n-type electrode 345 may include at least one of chromium, nickel, or gold, for example.

On the other hand, the vertical-structured light-emitting device b includes a p-type electrode 345, a p-type semiconductor layer 343, an active layer 342, an n-type semiconductor layer 341, and an n-type electrode 345 sequentially stacked . ≪ / RTI >

When a voltage is applied to the p-type electrode 345 and the n-type electrode 345, such a light emitting device has a structure in which holes and electrons are combined in the active layer 342 and a light corresponding to a height difference (energy gap) It can be operated on the principle of releasing energy.

Hereinafter, an embodiment according to the present invention will be described by taking as an example that the light source 220 includes a light emitting diode chip 321 as a light emitting element that emits light.

The light emitting diode chip 321 is packaged in a mold part 322 constituting the body of the light source 220 and a cavity 323 may be formed at one side of the central part of the mold part 322. On the other hand, the mold part 322 can be injection-molded into a press (Cu / Ni / Ag substrate) with a resin material such as PPA (high strength plastic), and the cavity 323 of the mold part 322 functions as a reflection cup Can be performed. The shape and structure of the mold part 322 can be changed, but are not limited thereto.

The plurality of lead frames 324 and 325 penetrate in the longitudinal direction of the mold portion 322 and each end 326 and 327 can be exposed to the outside. Here, the mold part 322 is referred to as a long axis when viewed from the bottom surface of the cavity 323 where the light emitting diode chip 321 is disposed, and the short axis is referred to as a short axis.

Semiconductor devices such as a light receiving element and a protection element can be selectively mounted on the lead frames 324 and 325 together with the light emitting diode chip 321 in the cavity 323. That is, not only the light emitting diode chip 321 but also a protection element such as a zener diode for electrostatic discharge (ESD) from the light emitting diode chip 321 may be mounted on the lead frames 324 and 325 have.

The light emitting diode chip 321 may be bonded to a lead frame 325 located on the bottom surface of the cavity 323 and then connected by wire bonding or flip chip bonding .

A resin material (not shown) is molded into the mounting area of the cavity 323 after the light emitting diode chip 321 is connected to the cavity 323. The resin material includes silicone or epoxy material, It is possible. The resin material may have a flat shape in which the surface is molded at the same height as the upper end of the cavity 323, a concave lens shape concave to the upper end of the cavity 323, or a convex lens shape convex to the upper end of the cavity 323 Can be formed in one form.

At least one side surface of the cavity 323 is formed to be inclined, and the side surface may function as a reflective surface (not shown) or a reflective layer for selectively reflecting incident light. The outer shape of the cavity 323 may be formed in a polygonal shape, or may have a shape other than a polygonal shape.

Referring to FIG. 31, the head 320, which is a part of the light source 220 in which light is emitted, includes a light emitting surface (indicated by an oblique line) from which light is actually emitted and a non- .

More specifically, the light emitting surface of the head part 320 of the light source 220 through which the light is emitted is defined by the cavity 323 in which the light emitting diode chip 321 is formed by the mold part 322 . For example, the light emitting diode chip 321 is disposed in the cavity 323 of the mold part 322, and the light emitted from the light emitting diode chip 321 is emitted through the light emitting surface surrounded by the mold part 322 . In addition, the non-light emitting surface of the head portion 320 of the light source 220 may be a portion where the mold portion 322 is formed and light is not emitted (not shown by an oblique line).

31, the light emitting surface of the head portion 320 of the light source 220 may have a shape whose width is longer than the longitudinal length. However, the shape of the light emitting surface of the head unit 320 is not limited thereto. For example, the light emitting surface of the light source 220 may have a rectangular shape.

A non-light emitting surface that does not emit light may be positioned on the upper side, the lower side, the left side, or the right side of the light emitting surface among the head portions 320 of the light source 220.

One ends 326 and 327 of the lead frames 324 and 325 extend to the outer side of the molding portion 322 and are firstly formed and then subjected to secondary molding with one side groove of the molding portion 322, 1 and second lead electrodes 328 and 329, respectively. Here, the number of forming times may be changed, but is not limited thereto.

The first and second lead electrodes 328 and 329 of the lead frames 324 and 325 can be formed in a shape accommodated in the grooves formed on both sides of the bottom surface of the molding portion 322. [ In addition, the first and second lead electrodes 328 and 329 may be formed in a plate shape having a predetermined shape, and may be formed into a shape that facilitates solder bonding at the time of surface mounting.

32, the structure of the light source 220 may be divided into a lead type, an SMD type, and a flip chip type depending on the packaging form of the LED chip. The structure of the light source 220 of the present invention is not limited to the above-described FIGS. 29 and 31, but may also be a lead type, an SMD type or a flip chip type structure shown in FIG.

33 is a view showing a structure of a plurality of light sources provided in the backlight unit.

Referring to FIG. 33, the first light source 220 and the second light source 225 of the plurality of light sources provided in the backlight unit 200 may emit light in different directions.

For example, the first light source 220 emits light in the lateral direction, and can be configured using a side view LED package for the light. Meanwhile, the second light source 225 emits light in the upward direction, and may be configured using a top view type LED package. In the backlight unit 200, the plurality of light sources 220 may be configured by mixing a top view type LED package and a side view type LED package.

As described above, since the backlight unit 200 is formed by combining two or more light sources that emit light in different directions, it is possible to prevent light from being concentrated or weakened in a specific area, The display panel 100 can provide light having a uniform luminance.

Although the embodiment of the present invention has been described with reference to FIG. 33 as an example in which a first light source 220 for emitting light in the lateral direction and a second light source 225 for emitting light in the upward direction are disposed adjacent to each other, The present invention is not limited to this. For example, the side view type light sources may be adjacent to each other or the top view type light sources may be disposed adjacent to each other.

34 to 44 are views showing a front surface shape of a backlight unit according to a seventh embodiment of the present invention.

34, a plurality of light sources 220 and 221 included in the backlight unit 200 are divided into a plurality of arrays, for example, a first light source array A1 and a second light source array A2 .

The first light source array A1 and the second light source array A2 may include a plurality of light source lines formed by the light sources, respectively. For example, the first light source array A1 is composed of a plurality of lines L1 each including two or more light sources, and the second light source array A2 is composed of a plurality of lines L2).

The light source lines included in the first light source array A1 and the light source lines included in the second light source array A2 may be alternately arranged so as to correspond to the display region of the display panel 100. [

In another embodiment of the present invention, the first light source array A1 includes odd-numbered light source lines from the upper side among a plurality of light source lines formed by the plurality of light sources, and the second light source array A2 is composed of upper And even-numbered light source lines from the even-numbered light source lines.

The first light source line L1 included in the first light source array A1 and the second light source line L2 included in the second light source array A2 are disposed vertically adjacent to each other and the first light source line L1 ) And the second light source line (L2) are alternately arranged to constitute the backlight unit (200).

The light source 220 included in the first light source array A1 and the light source 222 included in the second light source array A2 may emit light in the same direction or emit light in different directions .

Referring to FIG. 34, the backlight unit 200 may include two or more light sources that emit light in different directions.

That is, the light sources 220 included in the first light source array A1 and the light sources 222 included in the second light source array A2 may emit light in different directions. For this purpose, The direction in which the light emitting surfaces of the light sources 220 included in the first light source array A2 are directed may be different from the direction in which the light emitting surfaces of the light sources 222 included in the second light source array A2 are directed.

More specifically, the light emitting surfaces of the first light source 220 and the second light source 221 included in the first light source array A1 and the light emitting surface of the third light source 222 included in the second light source array A2 The first light source 220 and the second light source 221 included in the first light source array A1 and the second light source 221 included in the second light source array A2 can be formed so as to face each other, And the third light source 222 can emit light in mutually opposite directions.

In this case, the light sources provided in the backlight unit 200 may emit light in the lateral direction, respectively, and may be configured using a side view type LED package.

On the other hand, the plurality of light sources provided in the backlight unit 200 may be arranged to form two or more rows, and two or more light sources arranged in the same row may emit light in the same direction.

For example, the second light source 221 adjacent to the first light source 220 also emits light in the same direction as the first light source 220, that is, the x-axis direction, and the light sources adjacent to the third light source 222 It is possible to emit light in the same direction as the third light source 222, that is, in the direction opposite to the x-axis direction.

As described above, by forming the light emitting directions of the light sources arranged in the y-axis direction, for example, the second light source 221 and the third light source 222 in opposite directions to each other, It is possible to reduce the phenomenon that the brightness of light is concentrated or weakened.

In other words, the light emitted from the second light source 221 can be weakened as it proceeds to the adjacent light source, and accordingly, as the distance from the second light source 221 increases, the luminance of light emitted toward the display panel 100 Can be weakened.

Therefore, by reversing the direction in which the light is emitted from each of the second light source 221 and the third light source 222, it is possible to compensate for the fact that the brightness of light in the region adjacent to the light source is concentrated and the light in the region far from the light source is weakened So that the luminance of the light emitted from the backlight unit 200 can be made uniform.

The first light source line L1 included in the first light source array A1 and the second light source line L2 included in the second light source array A2 are arranged such that the right and left positions of the light sources do not coincide with each other, So that uniformity of light emitted from the backlight unit 200 can be improved.

That is, the third light source 222 included in the second light source array A2 is arranged to be adjacent to the first light source 220 or the second light source 221 included in the first light source array A1 in the diagonal direction .

35 to 42 are enlarged views of the P region in Fig.

35 and 36, two light source lines, for example, a first light source line L1 and a second light source line L2, which are included in the first light source array A1 and the second light source array A2 and are vertically adjacent to each other, The two light source lines L2 may be spaced apart by a predetermined distance.

The first light source array (A1) may include a first light source (220) emitting light in one direction. The second light source 221 disposed adjacent to the first light source 220 and disposed on the same horizontal line l1 as the first light source 220 and emitting light in the same direction as the first light source 220 . Here, the horizontal line l1 may be a line extending in the x-axis direction.

The second light source array A2 may be provided with a third light source 222 through which light is emitted in a direction opposite to the first light source 220. [ The third light source 222 is disposed between the first light source 220 and the second light source 221 and may be disposed diagonally with the first light source 220 or the second light source 221.

The third light source line L3 formed in the first light source array A1 may be spaced apart from the second light source line L2 by a predetermined distance. The third light source line L3 emits light in the same direction as the second light source 221 and is perpendicular to the direction in which the light of the second light source 221 is emitted and is perpendicular to the second light source 221 the second light source 223 may be disposed on the second light source 223.

The third light source 222 may be disposed between the second light source 221 and the fourth light source 223 and the distance d1 between the second light source 221 and the fourth light source 223 may be bisected And may be disposed on the horizontal line l3.

The third light source 222 may be disposed adjacent to a line 2 perpendicular to the second light source 221 and may be disposed in a direction opposite to a direction in which the light of the second light source 221 is emitted .

Here, the light directing angle [theta] from the light source and the light directing angle [theta] 'in the second layer 230 can have the relationship expressed by the following equation (1) according to Snell's law.

On the other hand, considering that the portion where light is emitted from the light source is an air layer (the refractive index n1 is 1) and the directivity angle of the light emitted from the light source is 60 degrees, The light directing angle? 'In the layer 230 may have a value as shown in the following equation (2).

When the second layer 230 is made of acrylic resin such as polymethyl methacrylate (PMMA), the refractive index of the second layer 230 is about 1.5. Therefore, the light-directing angle in the second layer 230 can be about 35.5 degrees.

As described above with reference to Equations 1 and 2, the directing angle? 'At which light is emitted from the light source in the second layer 230 may be less than 45 degrees, and the range in the y-axis direction may be smaller than that in the x-axis direction.

Accordingly, the third light source 222 may be disposed on the horizontal line? 3 bisecting the distance d1 between the second light source 221 and the fourth light source 223, thereby emitting light from the backlight unit 200 The brightness of the emitted light can be uniform.

Referring to FIG. 36, the first light source 220, the second light source 221, and the third light source 222 may be spaced apart from each other by a predetermined distance.

More specifically, the first light source 220 and the second light source 221 have a first distance d2 that is a distance between the light emitting surface of the first light source 220 and the light emitting surface of the second light source 221 Lt; / RTI > The first light source 220 and the third light source 222 have a second distance d3 that is a distance between the center of the light emitting surface of the first light source 220 and the center of the light emitting surface of the third light source 222 . The third distance d4 may be a horizontal distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222.

The first distance d2 is a distance between the center of the light emitting surface of the first light source 220 and the center of the opposite surface of the light emitting surface of the second light source 221, May be less than or equal to the second distance (d3), which is the distance between the centers of the light emitting surfaces of the third light source (222).

The first distance d2 that is the distance between the center of the light emitting surface of the first light source 220 and the center of the opposite surface of the light emitting surface of the second light source 221 is the center of the light emitting surface of the first light source 220, Is smaller than the second distance d3 that is the distance between the center of the light emitting surface of the light source 222, the area where the light emitted from the first light source 220 and the light emitted from the third light source 222 overlap is reduced , It is possible to prevent the luminance from being uneven. The third distance d4 which is the horizontal distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222 is reduced so that the distance between the second light source 221 and the third light source 222 It is possible to prevent the brightness from becoming dark in the area.

In other words, as shown in FIG. 37, a region where the light emitted from the first light source 220 and the light emitted from the third light source 222 are overlapped with each other may be removed to prevent the brightness from being uneven.

The first distance d2 that is the distance between the center of the light emitting surface of the first light source 220 and the center of the opposite surface of the light emitting surface of the second light source 221 is equal to the center of the light emitting surface of the first light source 220 The light emitted from the first light source 220 and the light emitted from the third light source 222 overlap each other if the second distance d3 is a distance between the center of the light emitting surface of the third light source 222 and the second distance d3, And the third distance d4 which is the horizontal distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222 may be the maximum. In other words, it is possible to minimize the overlap of the light between the first light source 220 and the third light source 222, and to minimize the occurrence of the dark portion in the region between the second light source 221 and the third light source 222 There is an advantage to be able to do.

38, the area where the light emitted from the first light source 220 and the light emitted from the third light source 222 are overlapped with each other is minimized, and the second light source 221 and the third There is an advantage that the brightness can be minimized in the region between the light sources 223.

Therefore, the backlight unit according to an embodiment of the present invention has an advantage that uniform brightness can be provided over the entire surface of the backlight unit.

39 and 40, the second light source 221 and the third light source 222 are arranged such that the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222 are the same vertical line? As shown in FIG. That is, the third distance d4, which is the distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222, can achieve the minimum distance.

Therefore, as shown in FIG. 40, it is possible to prevent dark portions between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222 from occurring, and thereby, the backlight unit 200, which exhibits better luminance uniformity, Can be provided.

Meanwhile, in the backlight unit of the present invention, the first layer 210 on which the light sources 220 are disposed may be divided into a plurality of blocks.

41 and 42 are views showing a backlight unit including at least two first layers 210. FIG.

41, a first optical assembly 10A and a second optical assembly 10B, in which a plurality of light sources 220, 221, and 222 are respectively disposed on a first layer 210, may be disposed in contact with each other. The plurality of light sources respectively disposed in the first optical assembly 10A and the second optical assembly 10B may be arranged in the same arrangement with respect to each other.

More specifically, the first optical assembly 10A is provided with a first light source 220, which emits light in one direction, and is disposed on a diagonal line with the first light source 220, The third light source 222 may emit light in a direction opposite to the direction in which the light is emitted.

The second optical assembly 10B may include a second light source 221 disposed on the same horizontal line as the first light source 220 and emitting light in the same direction as the first light source 220. [

36, the first distance d2, which is the distance between the center of the light emitting surface of the first light source 220 and the center of the opposite surface of the light emitting surface of the second light source 221, The distance d3 between the center of the light emitting surface of the third light source 222 and the center of the light emitting surface of the third light source 222 may be equal to or less than the second distance d3.

41, a third light source 222 disposed in the first optical assembly 10A may be disposed adjacent the side of the first optical assembly 10A and disposed in the second optical assembly 10B The second light source 221 may be placed in contact with the side of the second optical assembly 10B.

The third distance d4 which is a distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222 is equal to the sum of the widths of the second light source 221 and the third light source 222 can do.

In particular, the second light source 221 and the third light source 222 may each have a width of about 1 to 2 mm. Therefore, in the case of the backlight unit including a plurality of optical assemblies in this embodiment, the minimum distance of the third distance d4, which is the distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222, The sum of the widths of the first light source 221 and the third light source 222 may be the same.

43 and 44, the third distance d4, which is the distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222, is the distance between the second light source 221 and the third light source 222, May be greater than or equal to the sum 2t of the widths t of the light sources 222 and less than or equal to 10 times 10t of the widths t of the light sources 221 and 222. [ That is, d4 may be composed of 2t to 10t, and more preferably d4 may be composed of 3t to 8t.

The third distance d4 which is the horizontal distance between the light emitting surface of the second light source 221 and the light emitting surface of the third light source 222 is reduced so that the distance between the second light source 221 and the third light source 222 It is possible to prevent the brightness from becoming dark in the area of the display area.

Therefore, the backlight unit according to the present embodiment is configured such that the brightness is uneven between the first light source 220 and the third light source 222 or between the second light source 221 and the third light source 222 There is an advantage that it is possible to provide a backlight unit that exhibits better luminance uniformity.

45 and 46 are views showing a backlight unit according to an eighth embodiment of the present invention. In the following description, the same reference numerals are given to the same constituent elements as those in the first to seventh embodiments, and the description thereof will be omitted.

45, a backlight unit according to an exemplary embodiment of the present invention includes a plurality of diffusion patterns 240 for facilitating light emitted from a light source 220 to an adjacent light source 225 on a reflective layer 240, (241) may be formed. The plurality of diffusion patterns 241 may diffuse or refract light emitted from the light source 220.

46, the backlight unit 200 may include two or more light sources that emit light in different directions.

The backlight unit 200 may include a first light source 220 and a second light source 221 that laterally emit light in a direction parallel to the x axis, that is, in the same direction. A third light source 222 arranged perpendicular to the x-axis direction in which the first light sources 220 are arranged and emitting light in a direction opposite to the first light source 220 may be disposed. That is, the rows in which the first light sources 220 and the second light sources 221 are arranged and the rows in which the third light sources 222 are arranged may be arranged in an intersecting manner.

Therefore, by forming the light emission directions of the first light source 220, the second light source 221, and the third light source 222 in opposite directions to each other, the brightness of light is concentrated in a specific region of the backlight unit 200, The phenomenon of weakening can be reduced.

In this case, as the light emitted from each of the light sources 220, 221, and 222 advances, the brightness may be weakened. Accordingly, as the light is farther away from the light sources 220, 221, and 222, The brightness of the light emitted to the light emitting diode can be weakened.

Therefore, in the eighth embodiment of the present invention, a plurality of diffusion patterns 241 may be disposed between the light sources 220, 221, and 222. [ The plurality of diffusion patterns 241 may diffuse or refract light emitted from the light sources 220, 221, and 222 to emit light of a uniform brightness from the backlight unit 200.

The plurality of diffusion patterns 241 may include at least one of a metal or a metal oxide that is a reflective material and may be formed of a metal such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ) And a metal or metal oxide having a high reflectance as shown in FIG.

In this case, the plurality of diffusion patterns 241 may be formed by depositing or coating the metal or metal oxide on the first layer 210, or may be formed by printing metal ink. Here, as the deposition method, a vacuum deposition method such as a thermal deposition method, an evaporation method, or a sputtering method can be used. As the coating or printing method, a printing method, a gravure coating method, or a silk screen method can be used.

Further, in order to improve the effect of diffusion or refraction of the plurality of diffusion patterns 241, the color of the plurality of diffusion patterns 241 may have a color having a high brightness, for example, a color close to white.

The plurality of diffusion patterns 241 may be composed of a plurality of dots each including the material. For example, the plurality of diffusion patterns 241 may be formed of circular dots in each planar shape, and may be elliptical or polygonal.

The plurality of diffusion patterns 241 may increase in density from one light source to another adjacent light source. For example, the density may increase from the first light source 220 to the second light source 221. Accordingly, it is possible to prevent the luminance of the light emitted upward from the region remote from the first light source 220, that is, the rear region of the second light source 221, to be reduced, The brightness can be kept uniform.

For example, a plurality of diffusion patterns 241 made up of dots may increase the interval between two adjacent diffusion patterns from the light emitting surface of the first light source 220 toward the second light source 221, The light emitted from one light source 220 may be diffused or refracted toward the second light source 221 and the brightness may be uniformly maintained.

In particular, the plurality of diffusion patterns 241 may not exist in a region adjacent to each of the light sources 220, 221, and 222. Accordingly, the light emitted from the light sources 220, 221, and 222 is totally reflected by the lower reflective layer 240 in the region where the diffusion patterns 241 do not exist, and the diffusion patterns 241 The brightness of the entire region including the region adjacent to the light sources 220, 221, and 222 can be uniformly maintained.

A plurality of diffusion patterns 241 may be arranged in a line on the diagonal line between the first light source 220 and the third light source 222. Since the directions of the light emitted from the first light source 220 and the light emitted from the third light source 222 are opposite to each other, the light from the first light source 220 and the light from the third light source 222 The luminance can be increased in the region where it can be overlapped. Accordingly, a plurality of diffusion patterns 241 are positioned on the diagonal lines of the first light source 220 and the third light source 222, thereby preventing an increase in brightness in the overlap region of light.

46, the planar shape formed by the plurality of diffusion patterns 241 arranged in the direction in which the light of the first light source 220 is emitted is a direction in which the light of the third light source 222 is emitted The plurality of diffusion patterns 241 may be symmetrical with each other.

For example, the planar shape formed by the plurality of diffusion patterns 241 arranged in the direction in which the light beams from the first light source 220 and the third light source 222 are respectively emitted may have a fan shape.

This sector shape is arranged so as to correspond to a direction of the light emitted from the light source of about 120 degrees, thereby efficiently transmitting and diffusing the light emitted from the light source, so that the overall luminance of the backlight unit can be uniformly maintained.

47 is a view showing a backlight unit according to a ninth embodiment of the present invention.

Referring to FIG. 47, a first layer 210, a plurality of light sources 220 disposed on the first layer 210, a plurality of light sources 220, The reflective layer 240 disposed on the first layer 210 and the second layer 230 surrounding the first layer 210 may be composed of one optical assembly and the backlight unit 200 may include a plurality of optical assemblies .

Meanwhile, the plurality of optical assemblies 10 provided in the backlight unit 200 may be arranged in a matrix of N and M (N and M are natural numbers of 1 or more) in the x-axis and y-axis directions, respectively.

As shown in FIG. 47, the backlight unit 200 may be arranged in a 7x3 array of 21 optical assemblies 10. [ However, since the configuration shown in FIG. 47 is only an example for explaining the backlight unit according to the present invention, the present invention is not limited thereto and can be changed according to the screen size and the like of the display device.

For example, in the case of a display device having a size of 47 inches, the backlight unit 200 can be configured by disposing 240 optical assemblies 10 in a 24 × 10 array as described above.

Each optical assembly 10 may be fabricated as an independent assembly and may be closely spaced to form a modular backlight unit. Such a modular backlight unit can provide light to the display panel 100 as backlight means.

As described above, the backlight unit 200 may be driven by the entire driving method or a partial driving method such as local dimming, impulsive, or the like. The driving method of the backlight unit 200 may be variously changed according to the circuit design, but is not limited thereto. Thus, in the embodiment, the color contrast ratio is increased and the image of the bright part and the dark part on the screen can be expressed clearly, thereby improving the image quality.

That is, the backlight unit 200 is divided into a plurality of divided driving regions, and the luminance of the divided driving region is correlated with the luminance of the image signal to reduce the luminance of the black portion of the image and increase the luminance of the bright portion , The contrast ratio and sharpness can be improved.

For example, only a portion of a plurality of optical assemblies 10 may be independently driven to emit light upwardly, with the light sources 220 included in each of the optical assemblies 10 being independently controlled .

Meanwhile, the area of the display panel 110 corresponding to one optical assembly 10 may be divided into two or more blocks, and the display panel 100 and the backlight unit 200 may be dividedly driven in units of blocks .

By constructing the backlight unit 200 by assembling the plurality of optical assemblies 10 as described above, it is possible to simplify the manufacturing process of the backlight unit 200 and minimize the loss that may occur in the manufacturing process The productivity can be improved. In addition, the backlight unit 200 can be applied to various sizes of backlight units by mass-producing the optical assembly 10 in a standardized standard.

Meanwhile, when any one of the plurality of optical assemblies 10 provided in the backlight unit 200 is defective, it is not necessary to replace the entire backlight unit 200, and only the defective optical assembly can be replaced, And the cost of replacing parts is reduced.

FIG. 48 is a cross-sectional view of the configuration of a display device according to an embodiment of the present invention, and a description of the same components as those described with reference to FIGS. 1 to 47 of the display device shown in FIG.

48, a display panel 100 including a color filter substrate 110, a TFT substrate 120, an upper polarizer 130 and a lower polarizer 140, a first layer 210, The backlight unit 200 including the first layer 220 and the second layer 230 may be formed in close contact with each other.

For example, an adhesive layer 150 may be formed between the backlight unit 200 and the display panel 100 so that the backlight unit 200 may be adhered and fixed to the lower surface of the display panel 100.

More specifically, the upper surface of the backlight unit 200 can be adhered to the lower surface of the lower polarizer 140 using the adhesive layer 150. The backlight unit 200 may further include a diffusion sheet (not shown), and the diffusion sheet (not shown) may be disposed in close contact with the upper surface of the second layer 230. In this case, an adhesive layer 150 may be formed between the diffusion sheet (not shown) of the backlight unit 200 and the lower polarizer 140 of the display panel 100.

A back cover 35 may be disposed on the lower side of the backlight unit 200 and a back cover 35 may be formed on the lower side of the first layer 210 in close contact with the back cover 35.

The display device may include a power supply unit 55c for supplying a driving voltage to the display module 20 and more specifically to the display panel 100 and the backlight unit 200. For example, The plurality of light sources 220 provided in the light emitting units 200 may be driven by using a voltage supplied from the power supply unit 55c to emit light.

The power supply unit 55c may be disposed and fixed on the back cover 35 surrounding the rear surface of the display module 20 so that the power supply unit 55c can be stably supported and fixed.

According to an embodiment of the present invention, a first connector 310 may be formed on the rear surface of the first layer 210. For this purpose, a hole for inserting the first connector 310 is formed in the back cover 35, a hole 350 may be formed.

The first connector 310 electrically connects the light source 220 and the power supply unit 55c so that the driving voltage can be supplied from the power supply unit 55c to the light source 220. [

For example, the first connector 310 is formed on the lower surface of the first layer 210, and is connected to the power supply unit 55c using the first cable 420, The driving voltage supplied from the supplying unit 55c can be transmitted to the light source 220. [

An electrode pattern (not shown), for example, a carbon nanotube electrode pattern may be formed on the top surface of the first layer 210. The electrode formed on the upper surface of the first layer 210 contacts the electrode formed on the light source 220 to electrically connect the first connector 310 and the light source 220.

The display device may include a drive control unit 55a for controlling the driving of the display panel 100 and the backlight unit 200. For example, the drive control unit 55a may include a timing controller .

The timing controller controls the driving timing of the display panel 100 and more specifically includes a data driver (not shown), a gamma voltage generator (not shown) and a gate driver (not shown) provided in the display panel 100, And supplies the generated signal to the display panel 100. [0050]

The timing controller synchronizes a driving timing of the light sources 220 with the backlight unit 200 and more specifically the light sources 220 in synchronization with the driving of the display panel 100, Unit 200 as shown in FIG.

The drive control unit 55a may be disposed and fixed on the back cover 35 disposed on the rear surface of the display module 20 in order to stably support and fix the drive control unit 55a, have.

According to an embodiment of the present invention, a second connector 320 may be formed on the substrate 210, and a hole 350 for inserting the second connector 320 is formed in the back plate 50 .

The second connector 320 may electrically connect the first layer 210 and the drive control unit 55a to supply the control signal output from the drive control unit 55a to the first layer 210. [

For example, the second connector 320 is formed on the lower surface of the first layer 210, and is connected to the drive control unit 55a using the second cable 430 to be driven through the second cable 430 And can transmit the control signal supplied from the control unit 55a to the light source driving unit.

A light source driver (not shown) may be formed on the first layer 210. The light source driver (not shown) may be connected to the first layer 210 using a control signal supplied from the drive controller 55a through the second connector 320 The light sources 220 can be driven.

The power supply unit 55c and the drive control unit 55a may be enclosed by the drive unit cover 40 to be protected from the outside.

The structure of the display device shown in Fig. 48 is merely an embodiment of the present invention, and thus the power supply unit 55c, the drive control unit 55a, the first and second connectors 310 and 320, 2 cables 420 and 430 can be changed as needed.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (10)

A first layer;
A light source array disposed on the first layer, the first and second light sources being spaced apart from each other by a first distance, the first and second light sources emitting light in a first direction;
A third light source formed on the second line and emitting light in a second direction different from the first direction, and another light source array disposed on the first layer;
A reflective layer for reflecting light emitted from the first to third light sources;
A second layer located on the first and second lines; And
A pattern located on a portion corresponding to the first to third light sources and located on the second layer,
The second line is spaced apart from the first line so that the first light source is spaced a second distance from the third light source,
Wherein the second distance is greater than or equal to the first distance.
The method according to claim 1,
Wherein the light emitting surface of the second light source and the light emitting portion of the third light source are located on the same vertical line perpendicular to the first direction.
The method according to claim 1,
Wherein the first line and the second line are disposed alternately adjacent to each other.
The method according to claim 1,
Wherein the first direction is opposite to the second direction.
The method according to claim 1,
Wherein a width t of one of the first to third light sources satisfies a relation of 2t? D? 10t, wherein d is a line extending along the first surface of the second light source and a line extending along the second surface of the third light source A backlight unit that is the distance between extended lines.
6. The method of claim 5,
And the distance d satisfies the relationship of the width t and 3t < = d < = 8t.
6. The method of claim 5,
Wherein the first surface and the second surface are light emitting surfaces.
6. The method of claim 5,
And the distance d satisfies a relationship of the width t and 2t = d.
Backlight unit;
And a display panel disposed on a front surface of the backlight unit,
The backlight unit includes:
A first layer;
A first light source array disposed on the first layer, the first light source array including first and second light sources formed on a first line at a first distance from each other and emitting light in a first direction;
A second light source array formed on the second line and including a third light source emitting light in a second direction different from the first direction, the second light source array disposed on the first layer;
A reflective layer for reflecting light emitted from the first to third light sources;
A second layer located on the first and second lines; And
A pattern located on a portion corresponding to the first to third light sources and located on the second layer,
The second line is spaced apart from the first line so that the first light source is spaced a second distance from the third light source,
Wherein the second distance is equal to or larger than the first distance.
10. The method of claim 9,
Wherein the backlight unit is divided into a plurality of blocks, and the backlight unit is driven by the divided blocks.

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