KR20110077696A - Optical assembly, backlight unit and display apparatus thereof - Google Patents

Abstract

PURPOSE: An optical assembly, a backlight unit, and a display apparatus having the same are provided to improve display quality and reduce the thickness of the display apparatus. CONSTITUTION: An optical assembly of a display apparatus comprises a first layer(210), a plurality of light sources(220) which is arranged on the first layer, and a second layer in which a plurality of protrusions(271) are formed on the front surface of the second layer. The second layer is placed in front of the first layer. The cross section of the protrusions has a triangle, a rectangular, or a semi sphere shape.

Description

Optical assembly, backlight unit and display device having the same

The present invention relates to an optical assembly, a backlight unit having the same, and a display device.

Liquid crystal display devices have been used in various fields as well as notebook PC and monitor market due to small size, light weight and low power consumption.

The 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 implements an image by adjusting the light transmittance.

The backlight unit may be divided into an edge type and a direct type according to the shape of the light source. In the edge type, the light source may be disposed on the side of the liquid crystal panel, and the light guide plate may be disposed on the rear side of the liquid crystal panel to guide light provided from the side of the liquid crystal panel to the rear side of the liquid crystal panel. The direct type may include a plurality of light sources on the back of the liquid crystal panel, and light emitted from the plurality of light sources may be directly provided to the back of the liquid crystal panel.

As such a light source, an electro luminescence (EL), a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL), a light emitting diode (LED), or the like may be used. Among these, LEDs may 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 the display image and reducing the thickness thereof.

In order to achieve the above object, the optical assembly according to an embodiment of the present invention is a front surface of the first layer including a first layer, a plurality of light sources arranged on the first layer and the plurality of light sources. The second layer may include a second layer having a plurality of protrusions formed on an upper surface thereof.

The cross section of the plurality of protrusions may be made of any one selected from the group consisting of triangular, square and semicircular.

The plurality of protrusions may include a plurality of floors and a plurality of valleys, and the plurality of floors and the plurality of valleys may extend along a length direction of the plurality of protrusions.

At least one of the plurality of ridges and the plurality of valleys may extend in a straight or curved line along a longitudinal direction of the plurality of protrusions.

The plurality of protrusions may have a prism shape or a lenticular lens shape.

The plurality of protrusions may have a micro lens shape.

The second layer may further include a base positioned between the first layer and the plurality of protrusions.

The height of the base may be greater than or equal to the height of the light source.

The height of the plurality of protrusions may be 0.5 to 2% of the height of the base portion.

At least one of the base and the protrusion may include scattering particles.

The scattering particles may be located between the top of the light source and the protrusion.

In addition, the backlight unit according to an embodiment of the present invention may be disposed on a front surface of the first layer including a first layer, a plurality of light sources arranged on the first layer, and the plurality of light sources, and a plurality of upper surfaces thereof. It may comprise one or more optical assemblies comprising a second layer formed with a protrusion of the.

In addition, the display device according to an embodiment of the present invention is positioned on the front surface of the first layer including a first layer, a plurality of light sources arranged on the first layer, and the plurality of light sources, and a plurality of upper surfaces thereof. A backlight unit including at least one optical assembly including a second layer having a protrusion formed thereon, and a display panel positioned on the backlight unit, wherein the backlight unit is divided into a plurality of blocks, It may be driveable.

The display panel may be divided into a plurality of areas, and the luminance of light emitted from the block of the backlight unit corresponding to the area may be adjusted according to the gray level peak value or the color coordinate signal of each of the plurality of areas.

The backlight unit according to the embodiment of the present invention can reduce the thickness of the display device, and can simplify the manufacturing process of the display device and improve the appearance by closely attaching the backlight unit to the display panel.

In addition, by arranging the plurality of light sources in the backlight unit to emit light in different directions, it is possible to provide light of uniform brightness to the display panel, thereby improving the image quality of the display image.

In addition, by forming a plurality of protrusions having a condensing function in the second layer formed on the light source, the luminance of the light emitted from the light source can be improved, and there is an advantage that a condensing sheet such as a separate prism sheet can be omitted.

In addition, by including scattering particles in at least one of the protrusion and the base of the second layer, the light emitted from the light source can be more widely diffused, thereby providing uniform luminance. In addition, the diffusion effect of the scattering particles has the advantage that it can be omitted that the separate diffusion sheet is provided.

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

1 and 2 are views illustrating a display device according to an embodiment of the present invention.

Referring to FIG. 1, the display apparatus 1 according to an exemplary embodiment may include a display module 20, a front cover 30 surrounding the display module 20, and a driver provided in the display module 20. 55 and the back cover 40 surrounding the driving unit 55.

The front cover 30 may include a front panel (not shown) of a transparent material that transmits light, and the front panel protects the display module 20 at regular intervals, and the light emitted from the display module 20. The light is transmitted through the display module 20 so that the image displayed on the display module 20 can be seen from the outside.

In addition, the front cover 30 may be made of a flat plate without the window 30a. In this case, the front cover 130 is made of a transparent material that transmits light, for example, an injection molded plastic, and thus, when the front cover 30 is formed of a flat plate, the frame can be removed from the front cover 30. .

The driving unit 55 may include a driving control unit 55a, a main board 55b, and a power supply unit 55c. The driving controller 55a may be a timing controller, and is a driving unit for adjusting an operation timing of each driver IC of the display module 20, and the main board 55b is a V sink, an H sink, and an R for the timing controller 55a. And a driver for transmitting G and B resolution signals, and the power supply unit 55c is a driver for applying power to the display module 20.

The driving unit 55 may be provided in the display module 20 and may be wrapped by the back cover 40. In addition, the stand 60 supporting the display device 1 may be provided.

2, the timing controller 55a may be provided in the display module 20, and the main board 55b and the power board 55c may be provided in the stand 60. have. In addition, the back cover 40 may wrap only the driving unit 55 provided in the display module 20.

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

3 is a diagram illustrating a display module according to an exemplary embodiment.

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 thin film transistor (TFT) substrate 120 bonded to face each other 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 including red (R), green (G), and blue (B) sub-pixels, and generates an image corresponding to the color of red, green, or blue when light is applied. You can.

The pixels may be composed of red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel, but are not necessarily limited thereto.

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

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules change their arrangement corresponding to the voltage difference generated between the pixel electrode and the common electrode. As a result, the light provided from the backlight unit 200 may be incident on the color filter substrate 110 in response to a 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 side and the lower side of the display panel 100, and more specifically, the upper polarizer 130 is disposed on the upper surface of the color filter substrate 110. The lower polarizer 140 may be disposed on the bottom 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 the side of the display panel 100.

As shown in FIG. 3, the display module according to an exemplary embodiment may be configured by closely placing the backlight unit 200 on the display panel 100.

For example, the backlight unit 200 may be adhered to and fixed to the lower side of the display panel 100, more specifically, the lower polarizer 140, and for this purpose, between the lower polarizer 140 and the backlight unit 200. An adhesive layer (not shown) may be formed on the substrate.

As described above, by forming the backlight unit 200 in close contact with the display panel 100, the overall thickness of the display device may be reduced to improve appearance, and an additional structure for fixing the backlight unit 200 may be provided. It can be removed to simplify the structure and manufacturing process of the display device.

In addition, by removing the space between the backlight unit 200 and the display panel 100, it is possible to prevent the malfunction of the display device due to the infiltration of foreign matter into the space or the degradation of the image quality of the display image.

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

In addition, in order for the backlight unit 200 to be fixed to the lower surface of the display panel 100 in close contact with each other, the plurality of functional layers constituting the backlight unit 200, more specifically, the backlight unit 200, are each flexible. ) Can be made of a material.

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

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

4 is a diagram illustrating a backlight unit according to a 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 the plurality of light sources 220 are mounted, and an adapter (not shown) for supplying power and an electrode pattern (not shown) for connecting the light source 220 may be formed. Can be. For example, a carbon nanotube electrode pattern (not shown) for connecting the light source 220 and an adapter (not shown) may be formed on an upper surface of the substrate.

The first layer 210 may be made of polyethylene terephthalate (PET), glass, polycarbonate (PC), silicon (Si), or the like, and may be a printed circuit board (PCB) substrate on which a plurality of light sources 220 are mounted. It may be formed 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 the present embodiment, a light emitting diode package as the light source 220 will be described as an example.

The LED package constituting the light source 220 may be divided into a top view method and a side view method according to a direction in which the light emitting surface is directed. The light source 220 according to an embodiment of the present invention The light emitting surface may be configured using at least one of the LED package of the top view type formed toward the upper side and the LED package of the side view type formed to the side.

In the present embodiment, when the light source 220 is a side view type LED package, the light emitting surfaces of the plurality of light sources 220 are respectively disposed on the side surfaces thereof, that is, the first layer 210 or the reflective layer. 240 may emit light in an extended direction. Therefore, the problem that the light source 220 is observed as a hot spot on the screen can be reduced, and the thickness a of the second layer 230 can be reduced so that the backlight unit 200 and even the display device can be reduced. Slimming can be realized.

In addition, the light source 220 may be a colored LED or a white LED emitting at least one of colors such as red, blue, and green. 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 light emitting diode may be variously changed and applied.

Meanwhile, the second layer 220 disposed on the first layer 210 to surround the plurality of light sources 220 transmits and diffuses light emitted from the light source 220 and simultaneously diffuses the light source ( Light emitted from the 220 may be uniformly provided to the display panel 100.

The reflective layer 240 reflecting light emitted from the light source 220 may be positioned on the first layer 210. The reflective layer 240 may be formed in a region other than the region where the light source 220 is formed on the first layer 210. The reflective layer 240 may reflect the light emitted from the light source 220 and reflect 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, which is a reflective material. For example, the reflective layer 240 may have a high reflectance such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ). It may be configured to include a metal or a metal oxide having.

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 a metal ink. Here, as a deposition method, a vacuum deposition method such as a thermal evaporation method, an evaporation method or a sputtering method may be used, and as a coating or printing method, a printing method, a gravure coating method, or a silk screen method may be used.

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

In addition, in order for the light emitted from the light source 220 to be diffused so that the backlight unit 200 has a uniform brightness, the second layer 230 may be formed of a resin having a refractive index of about 1.4 to 1.6. For example, the second layer 230 may be polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyepoxy (PE), silicone, acrylic, or the like. It may be formed of any one material selected from the group consisting of.

In addition, the second layer 230 may include a polymer resin having adhesiveness so as to be in close contact with the light source 220 and the reflective layer 240. For example, the second layer 230 may be unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, Hydroxy ethyl methacrylate, hydroxy propyl methacrylate, hydroxy ethyl acrylate, acrylamide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, It may comprise an acrylic, urethane, epoxy, melamine, such as 2-ethyl hexyl acrylate polymer or copolymer or terpolymer.

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 then curing, or supporting the resin. It may be formed by applying a resin on the sheet and then partially curing and bonding the resin onto the first layer 210.

On the other hand, as the thickness a of the second layer 230 increases, the light emitted from the light source 220 may be spread more widely, and light of uniform brightness may be provided from the backlight unit 200 to the display panel. On the other hand, as the thickness (a) of the second layer 230 increases, the amount of light absorbed by the second layer 230 may increase, thereby increasing the luminance of the light provided from the backlight unit 200 to the display panel. May decrease overall.

Therefore, in order to provide light of uniform brightness without greatly reducing the brightness of light provided from the backlight unit 200 to the display panel, the thickness a of the second layer 230 is preferably 0.1 to 4.5 mm. Do.

FIG. 5 is a cross-sectional view of a region in which the light sources 220 are not positioned in the backlight unit 200. The configuration of the backlight unit 200 illustrated in FIG. 5 is the same as that described with reference to FIGS. 3 and 4. Description will be omitted below.

Taking the backlight unit 200 illustrated in FIG. 30 as an example, the cross-sectional view illustrated in FIG. 4 illustrates a cross-sectional configuration in which a region in which the light sources 220 are positioned in the backlight unit 200 is cut along a line A-A '. 5 is a cross-sectional view of a region in which the light sources 220 are not positioned in the backlight unit 200 along the line B-B '.

Referring to FIG. 5, in the region where the light sources 220 are not located in the backlight unit 200, the reflective layer 240 may cover the upper surface of the first layer 210.

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

6 is a diagram illustrating a backlight unit according to a second embodiment of the present invention. In the following, the same reference numerals are assigned to the same constituent elements as those in the above-described first embodiment, and description thereof will be omitted.

Referring to FIG. 6, a plurality of light sources 220 may be mounted on the first layer 210, and a second layer 230 may be disposed on the 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, and the scattering particles 231 scatter or refract incident light so that the light emitted from the light source 220 can be spread more widely. Can be.

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

For example, the scattering particles 231 may be polymethyl methacrylate / styrene copolymer (MS), polymethyl methacrylate (PMMA), polystyrene (PS), silicon, titanium dioxide (TiO ₂ ), silicon dioxide ( SiO ₂ ) or the like, or a combination of the above materials.

On the other hand, the scattering particles 231 may be made of a material having a lower refractive index than the material constituting the second layer 230, for example, by forming a bubble (bubble) in the second layer 230 It may be. In addition, the material constituting the scattering particles 231 is not limited to the above materials, and may be formed using various polymer materials or inorganic particles.

In addition, an optical sheet 250 may be disposed above the second layer 230, for example, the optical sheet 250 may include one or more prism sheets 251 and / or one or more diffusion sheets 252. can do.

In this case, the plurality of sheets included in the optical sheet 250 may be provided in a state of being adhered or adhered to each other without being spaced apart from each other, thereby reducing the thickness of the optical sheet 250 or the backlight unit 200.

Meanwhile, 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, for example, the lower polarizer 140. Can be.

The diffusion sheet 252 may diffuse the incident light to prevent the light emitted from the second layer 230 from being partially concentrated, thereby making the luminance of the light more uniform. In addition, the prism sheet 251 may collect light emitted from the diffusion sheet 252 to allow light to enter the display panel 100 vertically.

According to another embodiment of the present invention, the optical sheet 250 as described above, for example, at least one of the prism sheet 251 and the diffusion sheet 252 may be removed, or the prism sheet 251 and In addition to the diffusion sheet 252 may be configured to further include a variety of functional layers.

In addition, a plurality of holes (not shown) may be formed at a position corresponding to the plurality of light sources 220 in the reflective layer 240, and a plurality of light sources mounted on the lower substrate 210 in the holes. 220 may be inserted.

In this case, the light sources 220 may be inserted below through the holes formed in the reflective layer 240, so that at least a portion of the light sources 220 protrude upward from the reflective layer 240. As such, the backlight unit 200 is configured by using the structure in which the light sources 220 are inserted into the holes of the reflective layer 240, thereby, between the substrate 210 and the reflective layer 240 on which the light sources 220 are mounted. The fixability of can be improved more.

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

Referring to FIG. 7, the light emitting surfaces of the plurality of light sources 220 included in the backlight unit 200 are disposed on side surfaces thereof, and the side surfaces thereof, for example, the first layer 210 or the reflective layer 240 extend. Light can be emitted in a directed direction.

For example, the plurality of light sources 220 may be configured using a side view LED package, thereby reducing the observation of the light source 220 as a hot spot on the screen. The thickness a of the third layer 230 may be reduced to reduce the thickness of the backlight unit 200 and further, the display device.

In this case, the light source 220 may emit light having a predetermined direction angle α, for example, 90 degrees to 150 degrees, with respect to the first direction x. Hereinafter, the direction of the light emitted from the light source 220 will be described by displaying the first direction x.

According to an embodiment of the present invention, by forming a pattern on the upper side of the third layer 230, it is possible to reflect and diffuse the light emitted upward from the light source 220, thereby uniform from the backlight unit 200 It is possible to emit light of luminance.

8 to 13 illustrate a backlight unit according to a fourth embodiment of the present invention. In the following, the same reference numerals are given to the same elements as those in the above-described first to third embodiments, and description thereof will be omitted.

Each of the plurality of light sources 220 illustrated in FIGS. 8 to 13 may emit light in a lateral direction from the side of the light source, as shown in FIG. 7, but is not limited thereto. May emit.

Referring to FIG. 8, a pattern layer including a plurality of first patterns 232 may be formed on an upper side of the second layer 230 of the backlight unit 200 including the light sources 220. In detail, the plurality of first patterns 232 included in the pattern layer may be formed on the second layer 230 so as to correspond to positions where the light sources 220 are disposed.

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

The first pattern 232 may be formed on the second layer 230 to reduce the luminance of light emitted from the region adjacent to the light source 220, and thus light of uniform luminance is emitted from the backlight unit 200. You can do that.

That is, the first pattern 232 is formed on the second layer 230 to correspond to the position where the plurality of light sources 220 are disposed, and selectively reflects the light emitted upward from the light source 220. Luminance of the light emitted from the region adjacent to 220 may be reduced, and the reflected light may be diffused in the lateral direction.

In more detail, the light emitted from the light source 220 in the upward direction is diffused in the lateral direction by the first pattern 232 and reflected downwardly, and the light reflected in the first pattern 232 is the reflective layer. By 240, the light diffuses in the lateral direction and may be reflected upward. That is, the first pattern 232 may reflect 100% of the incident light, or may reflect some of the incident light and allow some of the light to pass therethrough. As such, the characteristics of the first pattern 232 may 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 may be diffused widely in the lateral direction and other directions without being concentrated upwards, and thus light of more uniform brightness may be emitted from the backlight unit 200.

The first pattern 232 may include a reflective material, such as a metal, and may include a metal having a reflectance of 90% or more, such as aluminum, negative, or gold. For example, the first pattern 232 may be made of a material or shape such that about 10% or less of the total incident light is transmitted and the rest is reflected.

In this case, the first pattern 232 may be formed by depositing or coating the metal as described above, and another method may be a reflective ink including a metal according to a predetermined pattern, for example, a silver ink. May be printed to form the first pattern 232.

Also, 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, the second layer ( 230 may have a higher brightness.

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

9 to 13, the plurality of first patterns 232 are formed to correspond to the positions of the light sources 220, respectively, as illustrated in FIG. 8, in the center of the first pattern 232. May be formed to match the center of the light source 220 corresponding thereto, as well as the case where the center of the first pattern 232 is spaced apart from the center of the light source 220 corresponding thereto by a predetermined distance. have.

That is, as shown in FIG. 9, the center of the first pattern 232 may not coincide with the center of the light source 220 corresponding to the first pattern 232.

For example, when the light emitting surface of the light source 220 is emitted in the lateral direction instead of in the upward direction, the luminance of the light emitted from the side of the light source 220 is set in the direction indicated by the arrow in FIG. 9. It may decrease as it progresses through the second layer 230. Accordingly, the brightness of the light may be higher in the first region immediately adjacent to the light emitting surface of the light source 220 than in the surroundings, whereas in the second area adjacent to the direction opposite to the light emitting surface, the brightness of the light may be in the first region. Can be lower than Therefore, the first pattern 232 may be formed to move in a direction in which light is emitted from the light source 220.

Accordingly, the center of the first pattern 232 may be formed at a position slightly biased in the direction in which light is emitted than the center of the light source 220 corresponding thereto.

Referring to FIG. 10, the first pattern 232 may be formed at a position more biased in a direction in which light is emitted than in the case illustrated in FIG. 9.

That is, the distance between the center of the first pattern 232 and the center of the light source 220 corresponding thereto may increase more than the case shown in FIG. 9, for example, as shown in FIG. 10. ) And the left end portion of the first pattern 232 may overlap each other.

Meanwhile, referring to FIG. 11, the first pattern 232 may be formed at a position more biased in a direction in which light is emitted than in the case illustrated in FIG. 10. That is, as shown in FIG. 11, the region where the first pattern 232 is formed and the region where the light source 220 corresponding thereto are not overlapped with each other, and accordingly, the left end of the first pattern 232 is not included. The portion may be formed spaced apart from the light emitting surface of the light source 220 by a predetermined interval.

In addition, as shown in FIG. 12, the first pattern 232 may be formed inside the second layer 230. In this case, as shown in FIGS. 9 to 11, the center of the first pattern 232 may be formed at a position slightly biased in the direction in which light is emitted than the center of the light source 220 corresponding thereto.

In addition, referring to FIG. 13, the first pattern 232 may be manufactured in the form of a sheet. In this case, a pattern layer including a plurality of first patterns 232 may be formed on the second layer 230. Can be.

For example, after forming a pattern layer by forming a plurality of first patterns 232 on one surface of the transparent film 260 through printing or the like, the pattern layer including the transparent film 260 is formed on the second layer 230. ) Can be laminated on. More specifically, the first pattern 232 may be formed by printing a plurality of dots on the transparent film.

Meanwhile, as the ratio of the area where the first pattern 232 is formed in the second layer 230 increases, the aperture ratio decreases, so that the overall luminance of light provided from the backlight unit 200 to the display panel 100 may decrease. . Here, the opening ratio may represent the amount of the region in which the first pattern 232 is not formed in the second layer 230.

Therefore, in order to prevent the luminance of the light provided to the display panel 100 from being greatly reduced and deteriorating the image quality of the display image, the opening ratio of the pattern layer on which the first pattern 232 is formed is preferably 70% or more. That is, the region in which the first pattern 232 is formed in the second layer 230 is preferably 30% or less of the total.

14 to 17 are diagrams illustrating an arrangement of a first pattern formed in a backlight unit according to an exemplary 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. 14, the first pattern 232 may be formed to have a circular or elliptical shape with respect to the position where the corresponding light source 220 is formed. 9 to 11, the center of the first pattern 232 may be formed at a position that does not coincide with the center of the light source 220 corresponding thereto. Meanwhile, each first pattern 232 may have a different shape or size.

Referring to FIG. 15, the first pattern 232 may be moved and positioned in a direction in which light is emitted, that is, in an x-axis direction, and accordingly, a central portion of the first pattern 232 may correspond to a light source 220 corresponding thereto. The light emitting device may be spaced apart from each other in a direction in which light is emitted by a predetermined interval with respect to the position at which the central portion of the center is formed.

Referring to FIG. 16, the first pattern 232 may be further moved in a direction in which light is emitted than in the case illustrated in FIG. 15, and accordingly, only a portion of the region where the light source 220 is formed may be formed. One pattern 232 may overlap with the formed region.

Meanwhile, referring to FIG. 17, the first pattern 232 may be further moved in a direction in which light is emitted than in the case of FIG. 16, so that the first pattern 232 may be located outside the region where the light source 220 is formed, and thus, the light source 220. The region where) is formed and the region where the first pattern 232 is formed may not overlap each other.

18 to 21 illustrate embodiments of the shape of the first pattern 232. The first pattern 232 may be configured of a plurality of dots or regions, and each dot or region is illustrated. It may comprise a silver reflective material, for example a metal or a metal oxide.

Referring to FIG. 18, 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, and at the center 234. As you go outward, the reflectance may decrease. The reflectance of the first pattern 232 decreases at the center 234 as the number of dots shown decreases from the center 234 to the outer region, or as the reflection characteristic of the material constituting the first pattern 232 decreases. It may decrease gradually toward the outer area.

In addition, the first pattern 232 may increase the transmittance or aperture of the light toward the outside from the center 234. Accordingly, the highest reflectance (eg, most of the light is transmitted through the central 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 lowest transmittance or aperture ratio, thereby concentrating light in a region where the light source 220 is formed, thereby more effectively preventing hot spots from occurring.

For example, in order to prevent hot spots from occurring as described above, the opening ratio of the central region overlapping the light source 220 in the first pattern 232 is preferably 5% or less.

Meanwhile, in the plurality of dots 233 constituting the first pattern 232, an interval between adjacent dots 233 may increase from the center 234 to the outside thereof, and thus, as described above, The first pattern 232 may be formed such that the reflectance decreases from the center 234 to the outside, and the transmittance or the aperture ratio increases.

Meanwhile, referring to FIG. 19, the first pattern 232 may have an elliptical shape. In addition, the central portion 234 of the first pattern 232 may be positioned to coincide with the central 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 not coincident with each other.

That is, as described with reference to FIGS. 9 to 11, the central portion 234 of the first pattern 232 is slightly in one direction than the central portion of the light source 220, for example, in a direction in which light is emitted from the light source 220. It 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 central portion of the light source 220 toward the outside. That is, the portion 235 of the first pattern 232 corresponding to the center of the light source 220 may be disposed to be shifted in one direction from the center portion 234, and the center of the light source 220 of the first pattern 232 may be located. The portion 235 may have the highest reflectance or the lowest transmittance.

Referring to FIGS. 20 and 21, the first pattern 232 may have a rectangular shape centering on the region where the light source 220 is formed, and the reflectance decreases from the center to the outside, and the transmittance or aperture ratio increases. can do. The features of the first pattern 232, as shown in FIGS. 18 and 19, are equally applicable to the first pattern 232 shown in FIGS. 20 and 21.

Also in this case, in order to prevent a hot spot from occurring as mentioned above, it is preferable that the opening ratio of the center area | region which overlaps with the light source 220 among the 1st patterns 232 is 5% or less.

As shown in FIGS. 20 and 21, the intervals between the adjacent dots 233 may increase from the center to the outside of the plurality of dots 233 constituting the first pattern 232.

Meanwhile, in the above, the case in which the first pattern 232 includes a plurality of dots is described as an example with reference to FIGS. 18 to 21, but the present invention is not limited thereto, and the reflectance decreases from the center to the outside. It can be formed into various structures in which the transmittance or the aperture ratio is increased.

For example, the concentration of the reflective material, for example, metal or metal oxide, may decrease as the first pattern 232 moves from the center to the outside, thereby decreasing the reflectance and increasing the transmittance or aperture ratio. The concentration of light in the region adjacent to the light source 220 can be reduced.

22 and 23 illustrate a backlight unit according to a fifth embodiment of the present invention. In the following, the same reference numerals are given to the same elements as those in the above-described first to fourth embodiments, and description thereof will be omitted.

Referring to FIG. 22, the first pattern 232 may have a convex shape in the direction of the light source 220. For example, the first pattern 232 may have a shape similar to the hemisphere. The cross-sectional shape of the first pattern 232 may have a semicircular or elliptical shape that is convex toward the light source 220.

As described above, the first pattern 232 having a convex shape may reflect the incident light at various angles, thereby diffusing the light emitted by the light source 220 in a wide range, and thus the second layer 230. The luminance of the light emitted from the upper side can be made more uniform.

As described above, the first pattern 232 may include a reflective material such as a metal or a metal oxide. For example, the first pattern 232 may be formed on the upper surface of the second layer 230 at a negative angle. It can be formed by filling a material with the intaglio pattern. In addition, the first pattern 232 may be formed by printing a reflective material or attaching beads or metal particles to a sheet in a film form, and then compressing the film on the second layer 230. 230 may be formed above.

Meanwhile, the cross-sectional shape of the first pattern 232 may have various shapes convex toward the light source 220 in addition to the shape similar to the semicircle as shown in FIG. 22.

For example, as shown in FIG. 23, the cross-sectional shape of the first pattern 232 may have a triangular shape convex toward the light source 220, in which case the first pattern 232 may be a pyramid shape or a prism. It may have a shape.

24 is a diagram illustrating a display device according to a sixth embodiment of the present invention. In the following, the same reference numerals are given to the same elements as those in the above-described first to fifth embodiments, and description thereof will be omitted.

Referring to FIG. 24, light emitted from the light source 220 may be diffused by the second layer 230 and emitted upward. In addition, the second layer 230 may include a plurality of scattering particles 231 to scatter or refract the light emitted upward, thereby making the luminance of the light emitted upward more uniform.

According to an embodiment of the present disclosure, the third layer 235 may be disposed above the second layer 230. The third layer 235 may be made of the same or different material as that of the second layer 230, and diffuses light emitted upward from the second layer 230 so as to increase the light luminance of the backlight unit 200. Uniformity can be improved.

The third layer 235 may be made of a material having the same refractive index as that of 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 made of a material having a higher refractive index than the second layer 230, the light emitted from the second layer 230 may be spread more widely. Conversely, when the third layer 235 is composed of a material having a lower refractive index than the second layer 230, the reflectance of light emitted from the second layer 230 is reflected at the bottom surface of the third layer 235 to be improved. This may make it easier for light emitted from the light source 220 to travel along the second layer 230.

Meanwhile, the third layer 235 may also include a plurality of scattering particles 236, in which case the density of the scattering particles 236 included in the third layer 235 is determined by the second layer 230. It may be higher than the density of the scattering particles 231 included.

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

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

In addition, as shown in FIG. 24, another pattern layer, that is, a plurality of second patterns 265, may be included on the third layer 235.

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

For example, when the light emitted upward from the third layer 235 is concentrated at a specific part and observed with high luminance on the screen, the light may be applied to an area corresponding to the specific part of the upper surface of the third layer 235. 2 patterns 265 may be formed, thereby reducing the luminance of the light in the specific portion, thereby making the luminance of the light emitted from the backlight unit 200 uniform.

The second pattern 265 formed on the upper side of the third layer 235 may be made of titanium dioxide (TiO ₂ ), and in this case, part of the light emitted from the third layer 235 may be the second pattern 265. In the downward direction and the remaining portion of the light can be transmitted.

Referring to FIG. 25, the thickness h1 of the second layer 230 may be smaller than the height h3 of the light source 220. Accordingly, the second layer 230 may surround the lower portion of the light source 220, and the third layer 235 may be formed to surround the upper portion of the light source 220.

The second layer 230 may be made of a resin having high adhesion, and may have a higher adhesion than the third layer 235, for example. Accordingly, the light emitting surface of the light source 220 may be more strongly adhered to the second layer 230, so that no space is generated 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 acrylic 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 second layer 230 and the third layer 230 may each have a refractive index of 1.4 to 1.6. In addition, the thickness h2 of the third layer 235 may also be smaller than the height h3 of the light source 220.

FIG. 26 is a diagram for describing a positional relationship between the light source 220 and the reflective layer 240 provided in the backlight unit.

Referring to FIG. 26, as the reflective layer 240 is disposed on the side of the light source 220, some of the light emitted from the light source 220 to the side may be incident to the reflective layer 240 to be lost.

The loss of light emitted from the light source 220 reduces the amount of light incident to the second layer 230 and proceeds, thereby reducing the amount of light provided from the backlight unit 200 to the display panel 100, thereby displaying a display image. The brightness of may decrease.

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

Here, the thickness b of the reflective layer 240 may be equal to or smaller than the height c of the light emitting unit 222, so that the light source 220 may be located above the reflective layer 240.

Therefore, the thickness b of the reflective layer 240 may be 10 nm to 100 μm or less. Here, when the thickness b of the reflective layer 240 is 10 nm or more, the reflective layer 240 may achieve a light reflectance in a reliable range, and when the thickness b of the reflective layer 240 is 100 μm or less, a light source ( Since the light emitting part 222 of the 220 is covered, the light emitted from the light source 220 may be prevented from being lost.

Accordingly, in order for the reflective layer 240 to improve the incident efficiency of the light emitted from the light source 220 and to reflect most of the light incident from the light source 220, the thickness b of the reflective layer 240 is 10 nm to 10 nm. It may be formed to 100㎛.

27 and 28 are views illustrating a structure of a light source provided in the backlight unit. FIG. 27 shows the structure of the light source as seen from the side, and FIG. 28 shows the structure of the head of the light source as seen from the front.

Referring to FIG. 27, the light source 220 may include a light emitting element 321 for emitting light, a mold 322 having a cavity 323, and a plurality of lead frames 324 and 325. Can be.

The light emitting device 321 may be a light emitting diode chip, and the light emitting diode chip may include a blue LED chip or an ultraviolet LED chip, or a red LED chip, a green LED chip, a blue LED chip, and yellow green. green) may be configured in the form of a package combining at least one or more of the LED chip, white LED chip.

Hereinafter, an embodiment according to the present invention will be described with an example in which the light source 220 includes a light emitting diode chip 321 as a light emitting device that emits light.

The light emitting diode chip 321 is packaged in the mold part 322 constituting the body of the light source 220, and a cavity 323 may be formed at a central side of the mold part 322. Meanwhile, the mold part 322 may be injection molded to a press (Cu / Ni / Ag substrate) using a resin material such as PPA (highly reinforced plastic), and the cavity 323 of the mold part 322 may function as a reflective cup. Can be done. The shape or structure of the mold unit 322 may be changed, but is not limited thereto.

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

Along with the light emitting diode chip 321, semiconductor elements such as a light receiving element and a protection element may be selectively mounted on the lead frames 324 and 325 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 protecting an electrostatic discharge (ESD) may be mounted on the lead frames 324 and 325 together. have.

The light emitting diode chip 321 may be bonded to any one of the lead frames 325 disposed on the bottom surface of the cavity 323, and then connected to the light emitting diode chip 321 by wire bonding or flip chip bonding. .

In addition, after the light emitting diode chip 321 is connected to the inside of the cavity 323, a resin material (not shown) is molded into the mounting area. The resin material may include a silicon or epoxy material, and a phosphor may be selectively added. It may be. This resin can be in the form of a flat surface where the surface is molded at the same height as the top of the cavity 323, a concave lens shape concave to the top of the cavity 323, or a convex lens shape convex to the top of the cavity 323. It can be formed in one form.

At least one side of the cavity 323 is formed to be inclined, and the side 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, and may be formed in other shapes other than the polygonal shape.

Referring to FIG. 28, the head part 22, which is a part of light emitted from the light source 220, may include a light emitting surface (indicated by diagonal lines) where light is actually emitted, and a non-light emitting surface on which other parts of light are not emitted. It may include.

In more detail, the light emitting surface of the head portion 22 of the light source 220 in which light is emitted may be defined by the cavity 323 formed by the mold portion 322 and in which the light emitting diode chip 321 is disposed. Can be. For example, the LED chip 321 is disposed in the cavity 323 of the mold part 322, so that light emitted from the LED chip 321 is emitted through the light emitting surface surrounded by the mold part 322. Can be. In addition, the non-light emitting surface of the head portion 22 of the light source 220 may be a portion (not shown by hatching) where the mold portion 322 is formed so that light is not emitted.

In addition, as illustrated in FIG. 28, the light emitting surface of the head part 22 of the light source 220 may have a shape in which the horizontal length is longer than the vertical length. However, the shape of the light emitting surface of the head portion 22 is not limited thereto, and for example, the light emitting surface of the light source 220 may have a rectangular shape.

In addition, a non-light emitting surface that does not emit light may be positioned on the upper, lower, left, or right side of the light emitting surface of the head portion 22 of the light source 220.

Meanwhile, one ends 326 and 327 of the lead frames 324 and 325 are extended to the outside of the molding part 322 to be primarily formed, and secondly formed into one groove of the molding part 322 to be formed. The first and second lead electrodes 328 and 329 may be disposed. Here, the number of forming may be changed, but is not limited thereto.

The first and second lead electrodes 328 and 329 of the lead frames 324 and 325 may be formed to be received in grooves formed at both sides of the bottom surface of the molding part 322. In addition, the first and second lead electrodes 328 and 329 may be formed in a plate shape having a predetermined shape, and thus may be formed in a shape in which solder bonding is easy when surface mounting.

29 is a diagram illustrating a structure of a plurality of light sources provided in the backlight unit.

Referring to FIG. 29, among the plurality of light sources included in the backlight unit 200, the first light source 220 and the second light source 225 may emit light in different directions.

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

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

In FIG. 29, an embodiment of the present invention has been described with reference to an example in which a first light source 220 emitting light in a lateral direction and a second light source 225 emitting light in an upward direction are disposed adjacent to each other. The present invention is not limited thereto, and for example, a side view light source may be adjacent to each other, or a top view light source may be disposed to be adjacent to each other.

30 to 34 illustrate front shapes of a backlight unit according to an exemplary embodiment of the present invention.

Referring to FIG. 30, the plurality of light sources 220 and 221 included in the backlight unit 200 may be divided into a plurality of arrays, for example, a first light source array A1 and a second light source array A2. Can be.

The first light source array A1 and the second light source array A2 may each include a plurality of light source lines formed by the light sources. For example, the first light source array A1 consists of a plurality of lines L1 each including two or more light sources, and the second light source array A2 includes a plurality of lines each including two or more light sources ( 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 to correspond to the display area of the display panel 100.

As another embodiment of the present invention, the first light source array A1 is configured to include odd-numbered light source lines from an upper side among a plurality of light source lines formed by the plurality of light sources, and the second light source array A2 is on the upper side. It can be configured to include even light source lines from.

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 is disposed. ) And the second light source line L2 may be alternately arranged to configure the backlight unit 200.

In addition, the light source 220 included in the first light source array A1 and the light source 221 included in the second light source array A2 may emit light in the same direction or may emit light in different directions. Can be.

Referring to FIG. 31, the backlight unit 200 may include two or more light sources emitting light in different directions.

That is, the light sources 220 included in the first light source array A1 and the light sources 221 included in the second light source array A2 may emit light in different directions. The direction in which the light emitting surfaces of the light sources 220 included in A1 face and the direction of the light emitting surfaces of the light sources 221 included in the second light source array A2 may be different from each other.

In more detail, the light emitting surface of the first light source 220 included in the first light source array A1 and the light emitting surface of the second light source 221 included in the second light source array A2 face each other in opposite directions. Accordingly, the first light source 220 included in the first light source array A1 and the second light source 221 included in the second light source array A2 may emit light in opposite directions. have.

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

Meanwhile, 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, light sources left and right adjacent to the first light source 220 also emit light in the same direction as the first light source 220, that is, in a direction opposite to the x-axis direction, and adjacent to the second light source 221 from left and right. The light sources may also emit light in the same direction as the second light source 221, that is, in the x-axis direction.

As described above, the light emitting directions of the light sources disposed adjacent to the y-axis direction, for example, the first light source 220 and the second light source 221 are formed in opposite directions, thereby specifying the backlight unit 200. It is possible to reduce the phenomenon that the brightness of the light is concentrated or weakened in the region.

That is, the light emitted from the first light source 220 may be weakened as it proceeds to an adjacent light source. Accordingly, the farther away from the first light source 220, the brightness of the light emitted toward the display panel 100 in the corresponding area. Can be weakened.

Accordingly, by reversing the directions in which light is emitted from each of the first light source 220 and the second light source 221, the luminance of light is concentrated in an area adjacent to the light source and the brightness of light is weakened in an area far from the light source. As a result, the luminance of light emitted from the backlight unit 200 may be uniform.

In addition, 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 do not correspond to the left and right positions of the light sources, and alternate with each other. It may be disposed in the form, thereby improving the uniformity of the light emitted from the backlight unit 200.

That is, the second light source 221 included in the second light source array A2 may be disposed to be diagonally adjacent to the first light source 220 included in the first light source array A1.

Referring to FIG. 32, two light source lines each included in the first light source array A1 and the second light source array A2 and vertically adjacent to each other, for example, the first light source line L1 and the second light source line L2 may be spaced apart by a predetermined interval d1.

That is, the first light source 220 included in the first light source array A1 and the second light source 221 included in the second light source array A2 have a y-axis direction perpendicular to the x-axis, which is a direction in which light is emitted. It may be spaced apart by a predetermined interval (d1) relative to.

As the distance d1 between the first and second light source lines L1 and L2 increases, an area where light emitted from the first light source 220 or the second light source 221 cannot reach may occur. As a result, the luminance of light in the region may be very weak.

Meanwhile, as the gap d1 between the first and second light source lines L1 and L2 decreases, an interference phenomenon between light emitted from the first light source 220 and the second light source 221 may occur. In this case, the dividing driving efficiency of the light sources may decrease.

Thus, in order to reduce the interference between the light sources and at the same time to make the luminance of the light emitted from the backlight unit 200 uniform, adjacent light source lines, eg, first and second, in a direction intersecting with the direction in which the light is emitted. The distance d1 between the light source lines L1 and L2 may be 5 to 22 mm.

In addition, the third light source 222 may be included in the first light source line of the first light source array A1 to be disposed adjacent to the first light source 220 in a direction in which light is emitted, and the first light source 220 may be used. The third light source 222 may be spaced apart at a predetermined interval d2.

On the other hand, the light directivity angle θ from the light source and the light directivity angle θ ′ in the second layer 230 may have a relationship as shown in Equation 1 according to Snell's law.

On the other hand, considering that the portion where the light is emitted from the light source is the air layer (refractive index n1 is '1'), and in general, the direction angle θ of the light emitted from the light source is 60 degrees, The light directivity angle θ 'in the layer 230 may have a value as shown in Equation 2 below.

In addition, when the second layer 230 is composed of an acrylic resin series such as polymethyl metaacrylate (PMMA), since the second layer 230 has a refractive index of about 1.5, the optical directivity angle in the second layer 230 according to Equation 2 θ ') may be about 35.5 degrees.

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

Therefore, the distance d1 between two adjacent light sources, that is, the first light source 220 and the second light source 221, in the direction intersecting with the direction in which light is emitted is determined by two adjacent light sources, that is, the first light source in the direction in which the light is emitted. The light source 220 may be smaller than the distance d2 between the light source 220 and the third light source 222, and thus the luminance of light emitted from the backlight unit 200 may be uniform.

On the other hand, in consideration of the distance d1 between adjacent light source lines having the range as described above, in order to reduce the interference between the light sources and to make the luminance of the light emitted from the backlight unit 200 uniform, The distance d2 between two adjacent light sources, ie, the first light source 220 and the third light source 222, in the emitting direction may be 9 to 27 mm.

Referring to FIG. 32, the second light source 221 included in the second light source array A2 may be disposed between the first light source 220 and the third light source 222 adjacent to each other included in the first light source array A1. It may be arranged to correspond to the position.

That is, the second light source 221 is disposed adjacent to the first light source 220 and the third light source 222 in the y-axis direction, and a straight line passing between the first light source 220 and the third light source 222 ( on l).

In this case, an interval d3 between the straight line l on which the second light source 221 is disposed and the first light source 220 is greater than an interval d4 between the straight line l and the third light source 222. Can be large.

The light emitted from the second light source 221 travels in a direction opposite to the light emission direction of the third light source 222, and thus is emitted toward the display panel 100 in an area adjacent to the third light source 222. The brightness of the light may be weakened.

Thus, by arranging the second light source 221 to be closer to the third light source 222 than the first light source 220 as described above, the second light source is weakened in the region adjacent to the third light source 222. Compensation may be made by using luminance of light concentrated in an area adjacent to 221.

Meanwhile, at least one of the plurality of light sources 220 provided in the backlight unit 200 may emit light in a horizontal direction, that is, a direction slightly oblique to the x axis direction.

For example, referring to FIG. 33, a direction toward which the light emitting surfaces of the light sources 220 and 221 face may be formed obliquely upward or downward by a predetermined angle with respect to the x axis direction.

In addition, as illustrated in FIG. 34, the light sources 220, 221, and 224 included in the light source lines L1, L2, and L3 may be alternately disposed. For example, the light sources included in the lines L1, L3 and L2 of the first light source array A1 may be alternated with the light sources included in the lines L2, L1 and L3 of the second light source array A2.

Accordingly, the lines L1, L3 and L2 included in the first light source array A1 and the lines L2, L1 and L3 included in the second light source array A2 may be alternately disposed. In addition, the light sources 220, 221, 222, 224, etc. may be the same light source, but emit light in different directions or, if necessary, light sources having different characteristics such as different types or sizes or directions. It may be.

35 to 38 are views illustrating a structure of a reflective layer included in the backlight unit according to the present invention.

The reflective layer 240 provided in the backlight unit 200 according to the embodiment of the present invention may have two or more reflectances. For example, the reflectance of the reflective layer 240 may be configured to have different reflectances according to the formed positions. Can be. That is, the reflective layer 240 may include two or more regions each having a different reflectance.

Referring to FIG. 35, the reflective layer 240 may include a first reflecting layer 242 and a second reflecting layer 243 having different reflectances, and the first and second reflecting layers 242 having different reflectances. 243 may be arranged alternately.

For example, the first and second reflective layers 242 and 243 may be made of reflective sheets made of different materials, or may be specific to any one of the first and second reflective layers 242 and 243 made of the same reflective sheet. By adding a material or processing the surface, the reflectances of the first and second reflective layers 242 and 243 may be realized differently.

According to an embodiment of the present invention, the first and second reflective layers 242 and 243 may be composed of one reflective sheet that is not physically separated. In this case, by forming a pattern for adjusting the reflectance on at least a portion of the reflecting sheet, the first and second reflecting layers 242 and 243 having different reflectances as described above may be formed.

That is, the reflectance may be adjusted by forming a pattern in at least one of the region corresponding to the first reflective layer 242 and the region corresponding to the second reflective layer 243 of the reflective layer 240, for example, one reflection. A reflectance of the corresponding region may be adjusted by forming a pattern in an area corresponding to the second reflective layer 243 shown in FIG. 35 of the reflective layer 240 formed of a sheet.

More specifically, protruding patterns for diffusing light may be formed on an upper surface of a region of the reflective layer 240 corresponding to the second reflective layer 243, and thus, an area corresponding to the second reflective layer 243. Can reduce the reflectance. In this case, the light diffusion effect in the region of the reflective layer 240 corresponding to the second reflective layer 243 may be improved, so that the light emitted from the light source 220 is disposed in the adjacent light source 222. It can be spread evenly.

In addition, the surface roughnesses of the first and second reflective layers 242 and 243 may be different from each other. For example, the surface roughness of the second reflective layer 243 may be higher than the surface roughness of the first reflective layer 242. The reflectance of the second reflective layer 243 may be lower than that of the first reflective layer 242.

Meanwhile, the first reflective layer 242 adjacent to the light sources 220, 221, and 222 based on the direction in which light is emitted among the first and second reflective layers 242 and 243 may be formed of a specular reflection sheet. The second reflective layer 243 may be formed of a diffuse reflection sheet.

The specular reflection sheet may reflect light incident on a smooth surface and may have the same angle of incidence and angle of reflection. Accordingly, the first reflecting layer 242 may have the light incident at an oblique angle from the light sources 220, 221, and 222 at the same angle of incidence. It may be reflected to proceed in a direction toward an adjacent light source.

On the other hand, the diffuse reflection sheet may be observed as if the incident light is reflected at various angles and diffused due to the diffuse reflection generated on the rough surface on which the unevenness is formed, so that the second reflective layer 243 is the light source 220, 221, 222. After the light is emitted from the light beam, the light propagates and diffuses upward.

In one embodiment of the present invention, the second reflective layer 243 composed of the diffuse reflective sheet is formed by processing the surface of the reflective sheet to form irregularities, or a predetermined amount of diffuse reflective material such as titanium dioxide (TiO ₂ ). It may be formed by applying or adding at a density.

In this case, the reflectance of the first reflecting layer 242 may be higher than the reflectance of the second reflecting layer 243, so that the light incident from the light sources 220, 221, and 222 is incident on the first reflecting layer 242 as described above. The light is specularly reflected at the same reflection angle, and diffuse reflection occurs in the second reflection layer 243 to emit light upward.

As described above, the first reflective layer 242 adjacent to the light sources 220, 221, and 222 is configured as a specular reflection sheet having high reflectivity based on the direction in which light is emitted, thereby emitting the light emitted from the light sources 220, 221, and 222. The light can be effectively propagated to an adjacent light source, whereby the brightness of the light is concentrated in an area adjacent to the light sources 220, 221, and 222 and the brightness of the light is weakened in an area far from the light sources 220, 221, and 222. Can be reduced.

In addition, by forming the second reflecting layer 243 away from the light sources 220, 221, and 222 on the basis of the direction in which the light is emitted, the light reflecting the display panel 100 may be formed by using a diffuse reflecting sheet having a relatively low reflectance. The light emitted from the light sources 220, 221 and 222, thus compensating for the reduced brightness as the light emitted from the light sources 220, 221 and 222 proceeds to the adjacent light sources, thereby weakening the brightness of the light in an area far from the light sources 220, 221 and 222. This can reduce the phenomenon.

Meanwhile, the specular reflection sheet constituting the first reflection layer 242 specularly reflects the light emitted from the light sources 220, 221, and 222, proceeds toward the adjacent light source, and at the same time reflects some of the incident light upward. The light may be scattered to be emitted toward the display panel 100.

The diffuse reflection sheet constituting the second reflection layer 243 may be manufactured by processing a surface of a sheet made of the same material as the specular reflection sheet or by forming a plurality of protruding patterns on the surface.

According to an exemplary embodiment of the present disclosure, light luminance of an area adjacent to the light sources 220, 221, and 222 and a region far from the light sources 220, 221, and 222 may be similarly adjusted, and accordingly, the backlight unit 200 may be adjusted. The uniform light luminance in the entire area may be provided to the display panel 100.

In order for the light emitted from the light sources 220, 221, and 222 to proceed to the region where the adjacent light sources are disposed, the first reflective layer 242 adjacent to the light sources 220, 221, and 222 may be disposed based on the direction in which the light is emitted. The width w1 may be set to a value larger than the width w2 of the second reflective layer 243. However, the width w1 of the first reflective layer 242 may be equal to or smaller than the width w2 of the second reflective layer 243, in which case the first reflective layer 242 and the second reflective layer 243 The reflectivity may be adjusted to achieve the effects as described above.

On the other hand, as the width w1 of the first reflective layer 242 decreases, propagation of the light emitted from the light sources 220, 221, and 222 may be degraded, and thus far from the light sources 220, 221, and 222. The brightness of the light in the area may be weakened.

In addition, when the width w1 of the first reflective layer 242 increases greatly compared to the width w2 of the second reflective layer 243, light may be concentrated in an area far from the light sources 220, 221, and 222. For example, the luminance of light in an intermediate region between two adjacent light sources 220 and 222 may be weakened compared to an area far from the light sources 220, 221 and 222.

Therefore, the light emitted from the light sources 220, 221, and 222 proceeds to the area where the adjacent light sources are disposed and is emitted upward, thereby directing the light of uniform brightness to the display panel 100 in the entire area of the backlight unit 200. In order to provide, the width w1 of the first reflective layer 242 may be formed in a range of 1.1 times to 1.6 times the width w2 of the second reflective layer 243.

Referring to FIG. 35, the first light source 220 and the second light source 221 disposed adjacent to each other in the y-axis direction do not overlap the first reflective layer 242, that is, the first reflective layer 242 It may be disposed outside the formed area.

In addition, the third light source 222 and the second light source 221 which are adjacent to the first light source 220 in the x-axis direction may be disposed in an area where the second reflective layer 243 is formed.

For example, holes (not shown) into which the second light source 221 and the third light source 222 may be inserted may be formed in the second reflective layer 243, and thus the lower side of the second reflective layer 243. The second and third light sources 221 and 222 mounted on the substrate 210 may protrude upward through the holes of the second reflective layer 243 to emit light in the lateral direction.

Meanwhile, since the positions of the light sources 220, 221, and 222 illustrated in FIG. 35 are merely exemplary, the light sources 220, 221, and 222 may be disposed between the light sources 220, 221, and 222 and the first and second reflective layers 242 and 243. The positional relationship of may vary.

Referring to FIG. 36, the light sources 220, 221, and 222 may be formed at positions overlapping the boundary portion between the first reflective layer 242 and the second reflective layer 243, respectively.

Meanwhile, as shown in FIG. 37, the light sources 220, 221, and 222 may be located in an area where the first reflective layer 242 is formed.

In addition, referring to FIG. 38, the light sources 220, 221, and 222 are spaced apart from the boundary portion between the first reflective layer 242 and the second reflective layer 243 by a predetermined interval to form the first reflective layer 242. It may be located within.

According to an exemplary embodiment of the present invention, a gradation region in which the reflectance gradually increases or decreases may be formed at a boundary portion between the first and second reflective layers 242 and 243 having different reflectances.

For example, the gradation region may gradually decrease in reflectance from one side adjacent to the first reflective layer 242 to the other side adjacent to the second reflective layer 243.

39 is a view showing another structure of the reflective layer provided in the backlight unit according to the present invention.

Referring to FIG. 39, the reflectance of the second reflective layer 243 may be gradually increased or decreased depending on the position.

According to an embodiment of the present disclosure, the reflectance of the second reflective layer 243 may be gradually decreased in the direction (x-axis direction) in which light is emitted from the light source 221.

For example, the reflectance of the second reflecting layer 243 has the highest reflectance at the boundary with the first reflecting layer 242, for example, the reflectance similar to that of the first reflecting layer 242, and the first reflecting layer ( It may gradually decrease as it approaches the adjacent light source 226 spaced apart from 242.

As described above, by configuring the reflectance of the second reflecting layer 243, the reflectance at or around the boundary between the first reflecting layer 242 and the second reflecting layer 242 can be changed gently, and accordingly It is possible to reduce the difference in optical brightness due to a sudden change in reflectance at the boundary portion.

As described above, the second reflective layer 243 may be formed of a diffuse reflective sheet, and in this case, a diffuse reflective material may be formed. Accordingly, by gradually increasing or decreasing the concentration of the diffuse reflection material formed in the second reflective layer 243, the reflectance of the second reflective layer 243 may be gradually decreased or increased depending on the position.

For example, as illustrated in FIG. 39, the concentration of titanium dioxide (TiO ₂ ), which is a diffuse reflection material formed on the second reflective layer 243, is based on the direction in which light is emitted from the light source 221 (x-axis direction). It may be gradually increased, and accordingly, the reflectance of the second reflective layer 243 may be gradually decreased.

40 is a view illustrating another structure of the reflective layer provided in the backlight unit according to the present invention.

Referring to FIG. 40, the second reflecting layer 243 may include a first reflecting unit 244 and a second reflecting unit 248 having different reflectances from each other, and the plurality of first reflecting units 244, 245, and 246. , 247 and the plurality of second reflectors 248 may be alternately arranged.

In this case, the widths g1, g2, g3, and g4 of each of the first reflecting parts 244, 245, 246, and 247 included in the second reflecting layer 243 may have a direction x in which light is emitted from the light source 221. Incrementally with respect to the axial direction).

Meanwhile, reflectances of the first reflecting parts 244, 245, 246, and 247 may be smaller than reflectances of the second reflecting part 248, and reflectances of the second reflecting part 248 are reflectances of the first reflecting layer 242. May be the same as

For example, the second reflecting portion 248 included in the first reflecting layer 242 and the second reflecting layer 243 may be composed of the specular reflection sheet as described above, and the second reflecting layer 243 may include a second reflecting sheet 243. The first reflecting portions 244, 245, 246, and 247 may be configured as diffusion reflecting sheets.

Accordingly, the average reflectance of the second reflecting layer 243 may be lower than that of the first reflecting layer 242, thereby providing a more uniform luminance of light in the entire area of the backlight unit 200.

As shown in FIG. 40, the widths g1, g2, g3, and g4 of the first reflecting parts 244, 245, 246, and 247 are gradually increased in the x-axis direction as they are spaced apart from the light source 221. As a result, the reflectance of the second reflective layer 243 may be gradually decreased.

As a result, the reflectance at the boundary portion between or adjacent to the first reflective layer 242 and the second reflective layer 242 may change slowly, and thus the light luminance may be changed due to the rapid change in the reflectance at the boundary portion. Can reduce the car.

In the above, although the first reflective layer 242 has a uniform reflectivity and the reflectance of the second reflective layer 243 is changed according to the position with reference to FIGS. 35 to 40, an embodiment according to the present invention has been described. The present invention is not limited to this.

In other words. The second reflecting layer 243 has a uniform reflectance and the reflectance of the first reflecting layer 242 is changed depending on the position so that the reflectance at the boundary between the first and second reflecting layers 242 and 243 changes smoothly. Alternatively, the reflectivity of each of the first and second reflective layers 242 and 243 may vary depending on the position.

41 is a view showing another structure of the reflective layer provided in the backlight unit according to the present invention.

Referring to FIG. 41, a plurality of reflectors 244, 245, and 246 may be formed in a portion adjacent to the second reflecting layer 243 in the region where the first reflecting layer 242 is formed.

The plurality of reflectors 244, 245 and 246 may have a shape extending in a direction in which light is emitted from the light source 221, that is, in the x-axis direction, and the size of each of the plurality of reflectors 244, 245 and 246. , Shape, reflectance, material, etc. may be different from each other.

The reflectance of the reflectors 244, 245, and 246 may be smaller than the reflectance of the first reflecting layer 242 and may be the same as the reflectance of the second reflecting layer 243. For example, the reflectors 244, 245, 246 and the second reflecting layer 243 may be composed of a diffuse reflecting sheet as described above.

The positions of the light sources 221 and 226 illustrated in FIGS. 39 to 41 are only one embodiment, and the positions of the light sources 221 and 226 are changed as described with reference to FIGS. 35 to 38. It is possible.

42 to 46 illustrate a backlight unit according to a seventh embodiment of the present invention. In the following, the same reference numerals are assigned to the same elements as those in the above-described first to sixth embodiments, and description thereof will be omitted.

Referring to FIG. 42, a plurality of light sources 220 may be mounted on the first layer 210, and a second layer 230 may be disposed on the first layer 210. The reflective layer 240 may be formed on an upper surface of the first layer 210 between the first layer 210 and the second layer 230.

In the present embodiment, a plurality of protrusions 271 may be further included on an upper surface of the second layer 230. The plurality of protrusions 271 serves to collect light incident from the light source 220 and may be formed of the same material as the second layer 230.

The plurality of protrusions 271 may be formed in a shape having a characteristic of condensing light. For example, the cross-sections of the plurality of protrusions 271 may be formed of any one selected from the group consisting of triangles, squares, and semicircles.

In more detail, the plurality of protrusions 271 may have a cross section in a triangle, and the plurality of protrusions 271 may have a prism shape.

As illustrated in FIG. 42, when the plurality of protrusions 271 are formed in a prism shape, the plurality of protrusions 271 may be formed with a plurality of ridges 272 and valleys 273. Here, the distance P between the floors 272 of the plurality of protrusions 271 may be 20 to 60 μm, and the angle A of the floor 272 may be 70 to 110 °. In addition, the height h4 of the plurality of protrusions 271 may be the same as the height of the floor 272, and may be 10 to 100 μm.

And, as shown in Figure 43, the plurality of protrusions 271 may be formed in a linear extending in one direction, the plurality of floors 272 and the plurality of valleys 273 of the plurality of protrusions 271 It may extend along the longitudinal direction. Here, the plurality of ridges 272 and the plurality of valleys 273 may extend in a straight line.

On the other hand, as shown in FIG. 44, the plurality of floors 272 and the plurality of valleys 273 may extend along the length direction of the plurality of protrusions 271, and the plurality of floors 272 and the plurality of floors 272. At least one of the valleys 273 may extend in a curve. In FIG. 44, at least one of the plurality of floors 272 and the plurality of valleys 273 is formed in a regular curve, but is not limited thereto. It can be made of irregular curves.

On the other hand, unlike the above, the cross-section of the plurality of protrusions 271 may be formed in a hemispherical shape.

Referring to FIG. 45, the plurality of protrusions 271 may have a hemispherical cross section, and the plurality of protrusions 271 may have a lenticular lens shape. Here, the lenticular lens may be in the form of a tunnel filled inside, and the diffusion, refraction, or concentration of light may vary according to each pitch and height.

The plurality of protrusions 271 may be formed with a plurality of floors 272 and valleys 273. The plurality of protrusions 271 may be linearly extended in one direction, and the plurality of floors 272 and the plurality of valleys 273 may extend along the length direction of the plurality of protrusions 271. .

Here, the plurality of ridges 272 and the plurality of valleys 273 may extend in a straight line. On the other hand, although not shown, the plurality of floors 272 and the plurality of valleys 273 may extend along the length direction of the plurality of protrusions 271, and the plurality of floors 272 and the plurality of valleys 273. At least one of may extend in a curve.

Unlike the foregoing, referring to FIG. 46, the plurality of protrusions 271 may have a hemispherical cross section, and the plurality of protrusions 271 may have a micro lens shape.

In this case, the plurality of protrusions 271, that is, the microlenses may have a degree of condensing of light depending on the diameter and the density of the lens. Accordingly, the diameter of each lens of the micro lens may be 20 to 200㎛. In addition, the ratio of the microlenses to the total area may be 80 to 90%, or more.

Although the diameter of the microlens is illustrated as being regular in the present embodiment, the present invention is not limited thereto, and the microlens may have an irregularly random diameter.

Referring to FIG. 42 again, the second layer 230 may include a plurality of protrusions 271 on the top surface, and further include a base 275 between the first layer 210 and the plurality of protrusions 271. can do.

The base 275 may be an area between the valleys 273 of the plurality of protrusions 271 and the reflective layer 240. Here, the height h5 of the base 275 may be greater than or equal to the height h6 of the light source 220.

The second layer 230 serves to change the light emitted from the light source 220, that is, the point light source into a surface light source, and may serve to spread the light emitted from the light source 220 in all directions.

If the height h5 of the base 275 is lower than the height h6 of the light source 220, the light emitted from the light source 220 may be refracted or reflected by the protrusion 271 and may not be spread in all directions. . Therefore, a dark portion is generated between the light sources 220, so that it is difficult to provide a surface light source with uniform luminance.

Therefore, in the present invention, the height h5 of the base portion 275 is formed to be greater than or equal to the height h6 of the light source 220, thereby providing light having uniform luminance.

In addition, the height h4 of the plurality of protrusions 271 may be 0.5 to 2% of the height h5 of the base 275.

Here, when the height h4 of the plurality of protrusions 271 is 0.5% or more with respect to the height h5 of the base portion 275, the light emitted from the light source 220 is collected by the plurality of protrusions 271 and the luminance is increased. Is improved, and if the height h4 of the plurality of protrusions 271 is 2% or less with respect to the height h5 of the base portion 275, the pattern of the plurality of protrusions 271 arranged in a linear manner is displayed on the image. There is an advantage that can be prevented from appearing.

As described above, according to the present embodiment, by forming a plurality of protrusions having a light condensing function on the second layer formed on the light source, the luminance of light emitted from the light source can be improved, and a light condensing sheet such as a separate prism sheet is provided. There is an advantage that can be omitted.

47 to 49 illustrate a backlight unit according to an eighth embodiment of the present invention. In the following, the same reference numerals are assigned to the same elements as those in the above-described first to seventh embodiments, and description thereof will be omitted.

Referring to FIG. 47, a plurality of light sources 220 may be mounted on the first layer 210 and a second layer 230 may be disposed on the first layer 210. The reflective layer 240 may be formed on an upper surface of the first layer 210 between the first layer 210 and the second layer 230. In addition, the plurality of protrusions 271 may be disposed on the upper surface of the second layer 230, and the base 275 may be located between the plurality of protrusions 271 and the first layer 210.

In this embodiment, the plurality of scattering particles 231 may be further included in at least one of the plurality of protrusions 271 and the base 275.

More specifically, referring to FIG. 47, the plurality of protrusions 271 may include 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 specifically, the second layer 230, to scatter or refract light emitted from the light source 220. It may be made of a material having a higher refractive index than the silicone or acrylic resin constituting.

For example, the scattering particles 231 may be polymethyl methacrylate / styrene copolymer (MS), polymethyl methacrylate (PMMA), polystyrene (PS), silicon, titanium dioxide (TiO ₂ ), silicon dioxide ( SiO ₂ ) or the like, or a combination of the above materials.

On the other hand, the scattering particles 231 may be made of a material having a lower refractive index than the material constituting the second layer 230, for example, by forming a bubble (bubble) in the second layer 230 It may be. In addition, the material constituting the scattering particles 231 is not limited to the above materials, and may be formed using various polymer materials or inorganic particles.

On the other hand, referring to FIG. 48, at least one of the plurality of protrusions 271 and the base 275 may further include a plurality of scattering particles 231, and more specifically, scattering particles in the base 275. 231 may include.

The scattering particles 231 may scatter or refract incident light so that light emitted from the light source 220 may be diffused more widely. In particular, in the present exemplary embodiment, the scattering particles 231 may be disposed between the top of the light source 220 and the plurality of protrusions 271.

If the scattering particles 231 are disposed adjacent to the light source 220, the light emitted from the light source 220 hits the scattering particles 231 and is scattered so that they do not reach the adjacent light source 220. There may be room for cancer.

Therefore, in the present exemplary embodiment, the scattering particles 231 may be disposed between the top of the light source 220 and the plurality of protrusions 271, thereby providing a backlight unit having uniform luminance.

In addition, referring to FIG. 49, a plurality of scattering particles 231 may be further included in at least one of the plurality of protrusions 271 and the base 275, and may be included in the base 275 and the plurality of protrusions 271. Scattering particles 231 may be disposed as a whole.

In the present embodiment, the plurality of protrusions has been described as having a prism shape, but the present invention is not limited thereto, and the plurality of protrusions may have a lenticular lens or a micro lens shape.

As described above, according to the present embodiment, by including scattering particles in at least one of the protrusion and the base of the second layer, the light emitted from the light source can be diffused more widely, thereby providing a uniform luminance. . In addition, the diffusion effect of the scattering particles has the advantage that it can be omitted that the separate diffusion sheet is provided.

50 is a view illustrating a backlight unit according to a ninth embodiment of the present invention.

Referring to FIG. 50, the first layer 210, the plurality of light sources 220 and the plurality of light sources 220 disposed on the first layer 210 as described with reference to FIGS. 4 to 49 may be disposed. The second layer 230 and the reflective layer 240 disposed on the first layer 210 may be formed of one optical assembly, and the backlight unit 200 may include a plurality of the optical assemblies. Can be configured.

On the other hand, the plurality of optical assemblies 10 provided in the backlight unit 200 may be arranged in a matrix form N and M (N, M is one or more natural numbers) in the x-axis, y-axis direction, respectively.

As illustrated in FIG. 50, the backlight unit 200 may include 21 optical assemblies 10 arranged in a 7 × 3 arrangement. However, since the configuration shown in FIG. 50 is only an example for describing the backlight unit according to the present invention, the present invention is not limited thereto and may be changed according to the screen size of the display device.

For example, in the case of a 47-inch display device, the backlight unit 200 may be configured by arranging 240 optical assemblies 10 as described above in a 24 × 10 arrangement.

Each optical assembly 10 may be manufactured as an independent assembly, and may be disposed in close proximity to form a modular backlight unit. Such a modular backlight unit may provide light to the display panel 100 as a backlight means.

As described above, the backlight unit 200 may be driven in a full driving manner or a partial driving scheme such as local dimming or impulsive. The driving method of the backlight unit 200 may be variously changed according to a circuit design, but is not limited thereto. As a result, the color contrast ratio is increased and the image of the bright and dark parts of the screen can be clearly expressed, 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 linked with the luminance of the image signal so that the black portion of the image decreases the brightness and the bright portion increases the brightness. , Improve the contrast and sharpness.

For example, only some of the plurality of optical assemblies 10 can be driven independently to emit light upwards, for which the light sources 220 included in each of the optical assemblies 10 are independently controlled. Can be.

Meanwhile, an 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 divided and driven in units of the blocks. .

By assembling the plurality of optical assemblies 10 as described above to configure the backlight unit 200, it is possible to simplify the manufacturing process of the backlight unit 200, to minimize the loss (loss) that may occur in the manufacturing process Productivity can be improved. In addition, the backlight unit 200 has an effect that can be applied to a backlight unit of various sizes by standardizing the optical assembly 10 to mass production.

On the other hand, if any one of the plurality of optical assemblies 10 provided in the backlight unit 200 is defective, the replacement operation is not necessary because only the defective optical assembly needs to be replaced without replacing the entire backlight unit 200. It is easy to reduce the cost of replacing parts.

FIG. 51 is a cross-sectional view illustrating a configuration of a display apparatus according to an exemplary embodiment of the present disclosure. A description of the same configuration as that described with reference to FIGS. 1 to 50 will be omitted below.

Referring to FIG. 51, 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, and a plurality of light sources The backlight unit 200 including the 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 to and fixed to the lower side of the display panel 100.

More specifically, the upper surface of the backlight unit 200 may be bonded 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 an 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.

In addition, the back plate 50 may be disposed under the backlight unit 200, and the back plate 50 may be formed in close contact with the bottom surface of the first layer 210.

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

In order to stably support and fix the power supply 55c, the power supply 55c may be disposed and fixed on the back plate 50 surrounding the rear surface of the display module 20.

According to an embodiment of the present invention, a first connector 310 may be formed on the rear surface of the first layer 210, and a hole for inserting the first connector 310 into the back plate 50 is formed therefor. A hole may be formed.

The first connector 310 electrically connects the light source 220 and the power supply unit 55c so that a 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, is connected to the power supply 55c using the first cable 420, and supplies power through the first cable 420. The driving voltage supplied from the supply part 55c may be transmitted to the light source 220.

An electrode pattern (eg, 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 may be in contact with the electrode formed in the light source 220 to electrically connect the first connector 310 and the light source 220.

In addition, the display apparatus may include a driving controller 55a for controlling driving of the display panel 100 and the backlight unit 200. For example, the driving controller 55a may be a timing controller. Can be.

The timing controller controls driving timing of the display panel 100, and more specifically, a data driver (not shown), a gamma voltage generator (not shown), and a gate driver (not shown) included in the display panel 100. A signal for controlling the driving timing of the signal may be generated and supplied to the display panel 100.

Meanwhile, the timing controller backlights a signal for controlling the driving timing of the light sources 220 such that the backlight unit 200, and more particularly, the light sources 220 operate in synchronization with driving of the display panel 100. It may be supplied to the unit 200.

As shown in FIG. 51, in order for the driving controller 55a to be stably supported and fixed, the driving controller 55a may be disposed and fixed on the back plate 50 disposed at the rear of the display module 20. have.

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

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

For example, the second connector 320 is formed on the lower surface of the first layer 210, is connected to the driving control unit 55a using the second cable 430, and is driven through the second cable 430. The control signal supplied from the controller 55a may be transmitted to the first layer 210.

Meanwhile, a light source driver (not shown) may be formed in the first layer 210, and the light source driver (not shown) may be controlled using a control signal supplied from the drive controller 55a through the second connector 320. The light sources 220 may be driven.

In addition, the power supply unit 55c and the driving controller 55a described above may be wrapped with the back cover 40 to be protected from the outside.

The configuration of the display device illustrated in FIG. 51 is only an embodiment of the present invention, and accordingly, the power supply unit 55c, the driving control unit 55a, the first and second connectors 310 and 320, and the first and second units are illustrated. The position or number of the two cables 420 and 430 can be changed as necessary.

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. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 and 2 illustrate a display device according to an exemplary embodiment.

3 is a view showing a display module according to an embodiment of the present invention;

4 and 5 illustrate a backlight unit according to a first embodiment of the present invention.

6 is a view illustrating a backlight unit according to a second embodiment of the present invention;

7 is a view illustrating a backlight unit according to a third embodiment of the present invention.

8 to 13 illustrate a backlight unit according to a fourth embodiment of the present invention;

14 to 17 are views showing the arrangement of the first pattern formed in the backlight unit according to the embodiment of the present invention.

18 and 21 are views showing the shape of the first pattern of the present invention.

22 and 23 illustrate a backlight unit according to a fifth embodiment of the present invention.

24 is a diagram illustrating a display device according to a sixth embodiment of the present invention.

25 and 26 are cross-sectional views illustrating a positional relationship between a light source and a reflective layer provided in the backlight unit.

27 and 28 are views illustrating a structure of a light source provided in the backlight unit.

29 is a view illustrating a structure of a plurality of light sources provided in a backlight unit.

30 to 34 are front views of a backlight unit in which a plurality of light sources are arranged.

35 to 41 are views showing the structure of the reflective layer provided in the backlight unit according to the present invention.

42 to 46 illustrate a backlight unit according to a seventh embodiment of the present invention.

47 to 49 illustrate a backlight unit according to an eighth embodiment of the present invention.

50 is a view illustrating a backlight unit according to a ninth embodiment of the present invention;

51 shows a display device according to the present invention.

Claims (14)

First layer; A plurality of light sources arranged on the first layer; And And a second layer disposed on a front surface of the first layer including the plurality of light sources and having a plurality of protrusions formed on an upper surface thereof. The method of claim 1, The cross section of the plurality of protrusions is an optical assembly made of any one selected from the group consisting of triangular, square and semicircular. The method of claim 1, The plurality of protrusions includes a plurality of floors and a plurality of valleys, And the plurality of ridges and the plurality of valleys extend along a length direction of the plurality of protrusions. The method of claim 3, And at least one of the plurality of ridges and the plurality of valleys extends straight or curved along the longitudinal direction of the plurality of protrusions. The method of claim 3, And the plurality of protrusions are prismatic or lenticular lens shaped. The method of claim 1, And the plurality of protrusions are micro lens shaped. The method of claim 1, And the second layer further comprises a base positioned between the first layer and the plurality of protrusions. The method of claim 7, wherein And the height of the base is greater than or equal to the height of the light source. The method of claim 7, wherein And the height of the plurality of protrusions is between 0.5 and 2% of the height of the base. The method of claim 7, wherein At least one of the base and the protrusions comprises scattering particles. The method of claim 10, The scattering particles are located between the top of the light source and the protrusion. An optical assembly including a first layer, a plurality of light sources arranged on the first layer, and a second layer positioned on a front surface of the first layer including the plurality of light sources and having a plurality of protrusions formed on an upper surface thereof; One or more backlight unit. An optical assembly including a first layer, a plurality of light sources arranged on the first layer, and a second layer positioned on a front surface of the first layer including the plurality of light sources and having a plurality of protrusions formed on an upper surface thereof; A backlight unit including one or more; And A display panel on the backlight unit; The backlight unit may be divided into a plurality of blocks and may be driven for each of the divided blocks. The method of claim 13, The display panel is divided into a plurality of regions, and the brightness of light emitted from the block of the backlight unit corresponding to the region is adjusted according to the gray level peak value or the color coordinate signal of each of the plurality of regions.

Images