KR20110111041A - Back light unit and display apparatus comprising the same - Google Patents

Abstract

The backlight unit according to an exemplary embodiment of the present invention may include a plurality of first layers, a plurality of light sources disposed on the plurality of first layers, and a plurality of light sources that emit light, and the plurality of first light sources. At least one reflective layer positioned on the layers and a second layer positioned on the plurality of first layers and surrounding at least a portion of the at least one reflective layer and the plurality of light sources.

Description

Back light unit and display device including the same {Back Light Unit And Display Apparatus Comprising the same}

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

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 is easily applicable to screens of various sizes, and provides a high definition and thin backlight unit and a display device including the same.

In order to achieve the above object, a backlight unit according to an embodiment of the present invention is located on a plurality of first layers, the plurality of first layers, a plurality of light sources for emitting light and the plurality of light sources Except at least one reflective layer positioned on the plurality of first layers and a second layer disposed on the plurality of first layers and surrounding at least a portion of the at least one reflective layer and the plurality of light sources. Can be.

The plurality of light sources, the at least one reflective layer, and the second layer may be disposed on a front surface of the plurality of first layers, and at least one connector may be located on a rear surface of the plurality of first layers, respectively.

Among the plurality of first layers, the first layers having the same position of the connector may be alternately disposed with the first layers having different positions of the connector.

The plurality of first layers may include first substrates in which the connector is disposed adjacent to one side of the first layer, and second substrates in which the connector is disposed adjacent to the other side of the first layer.

The first substrates and the second substrates may be alternately arranged.

The connectors disposed on the first substrates may be disposed adjacent to the connectors disposed on the second substrates.

The plurality of first layers may be arranged side by side on the same plane.

The reflective layer may cover at least two or more adjacent ones of the plurality of first layers.

The reflective layer may cover a boundary of at least two first layers adjacent to each other.

In addition, the display device according to an embodiment of the present invention includes a plurality of first layers, a plurality of light sources positioned on the plurality of first layers, and a plurality of light sources that emit light, except for the plurality of light sources. A backlight unit including at least one reflective layer positioned on first layers and a second layer disposed on the plurality of first layers and surrounding at least a portion of the at least one reflective layer and the plurality of light sources; It may include a display panel positioned on the top and a bottom plate surrounding the backlight unit.

The plurality of light sources, the at least one reflective layer, and the second layer may be disposed on a front surface of the plurality of first layers, and at least one connector may be located on a rear surface of the plurality of first layers, respectively.

The bottom plate may include a hole positioned corresponding to the at least one connector.

The backlight unit and the display apparatus including the same according to an embodiment of the present invention may simplify the manufacturing process of the backlight unit by assembling a plurality of first layers to configure the backlight unit, and may cause loss in the manufacturing process. Productivity can be improved by minimizing losses.

In addition, there is an effect that can be applied to a backlight unit of various sizes by mass-producing the first layer to the standard standard.

1 is a diagram illustrating a display device according to an exemplary embodiment.
2 and 3 illustrate a backlight unit according to a first embodiment of the present invention.
4 is a view illustrating a cross-sectional shape of a region where light sources are not located in the backlight unit.
5 is a diagram illustrating a backlight unit according to a second embodiment of the present invention;
6 is a view illustrating a backlight unit according to a third embodiment of the present invention.
7 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 to 21 illustrate the shape of a first pattern formed in a backlight unit according to an exemplary embodiment of the present invention.
22 and 23 illustrate a backlight unit according to a fifth embodiment of the present invention.
24 and 25 illustrate a backlight unit according to a sixth embodiment of the present invention.
FIG. 26 is a view illustrating a positional relationship between a light source and a reflective layer provided in the backlight unit; FIG.
27 to 31 are views showing the structure of a light source provided in the backlight unit.
32 is a diagram illustrating a structure of a plurality of light sources provided in a backlight unit.
33 to 37 are views showing the front shape of the backlight unit of the present invention.
38 and 39 illustrate a backlight unit according to a seventh embodiment of the present invention.
40 to 61 illustrate a backlight unit according to an eighth embodiment of the present invention.
62 illustrates a display device according to an exemplary embodiment of the present invention.

1 is a diagram illustrating a display device according to an exemplary embodiment.

Referring to FIG. 1, the display apparatus 100 according to an exemplary embodiment may include a display panel 110, a backlight unit 120, a cover 130, a bottom plate 135, a driver 140, and a back cover. 150.

The display panel 110 is a portion where an image is implemented, and may include a TFT substrate 111 and a color filter substrate 112 bonded to each other with a liquid crystal layer interposed therebetween. Although not shown, a plurality of pixels may be defined in the TFT array substrate 111 by crossing a plurality of scan lines and data lines in a matrix shape. Each pixel may include a thin film transistor (TFT) capable of turning on / off a signal, and a pixel electrode connected to the thin film transistor may be positioned.

In addition, the color filter substrate 112 includes red (R), green (G), and blue (B) color filters corresponding to a plurality of pixels, respectively, and surrounds them with non-display such as scan lines, data lines, and thin film transistors. A black matrix covering the device may be provided. In addition, a transparent common electrode covering them may be provided.

In addition, the printed circuit board is connected to at least one side of the display panel 110 through a connecting member such as a flexible circuit board or a tape carrier package (TCP) to closely adhere to the rear surface of the bottom plate 135 in the modularization process. Can be arranged.

The display panel 110 having the structure as described above has data of the data driving circuit 114 when the thin film transistor selected for each scan line is turned on by the on / off signal of the gate driving circuit 113 transmitted from the scan line. The voltage is transmitted to the corresponding pixel electrode through the data line. As a result, an arrangement direction of the liquid crystal molecules is changed by an electric field between the pixel electrode and the common electrode, thereby indicating a difference in transmittance.

On the other hand, the display device 100 of the present invention may be provided with a backlight unit 120 that can provide light to the display panel 110 from the back of the display panel 110.

The backlight unit 120 may include an optical assembly 123 and a plurality of optical sheets 125 interposed on the optical assembly 123. Detailed description of the backlight unit 120 will be described later.

The display panel 110 and the backlight unit 120 described above may be modularized through the cover 130 and the bottom plate 135. The cover 130 positioned at the front of the display panel 110 may be a top cover, and has a rectangular frame shape covering the top and side surfaces of the display panel 110. The cover 130 may open the front of the cover 130 to display the display panel ( The image implemented in 110 may be displayed.

In addition, the bottom plate 135 located at the rear of the backlight unit 120 serves as a basis for the display device by combining the display panel 110 and the backlight unit 120, and has a rectangular plate shape. Can be made.

The driving unit 140 may be disposed on one surface of the bottom plate 135 positioned on the rear surface of the backlight unit 120. The driving unit 140 may include a driving control unit 141, a main board 142, and a power supply unit 143. The driving controller 141 may be a timing controller. The driving controller 141 may be a driving unit for adjusting an operation timing of each driving circuit of the display panel 110, and the main board 142 may include a V sink, an H sink, and an R, G, The driving unit transmits a B resolution signal, and the power supply unit 143 is a driving unit that applies power to the display panel 110 and the backlight unit 120.

The driving unit 140 may be provided on one surface of the bottom plate 135 positioned on the rear surface of the backlight unit 120 by the driving unit chassis 145. In addition, the driving unit 140 may be wrapped by the back cover 150.

Hereinafter, the above-described backlight unit will be described in more detail.

2 and 3 illustrate a backlight unit according to a first embodiment of the present invention.

2 and 3, 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. Can be.

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. Accordingly, the thickness e of the second layer 230 formed on the light source 220 may be reduced to reduce the thickness of the backlight unit 200 and further, the display device.

In addition, the light source 220 may be a colored LED or a white LED 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, acryl amide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2 -Acryl-based, urethane-based, epoxy-based, melamine-based, and the like, such as 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.

In addition, a diffusion plate 245 may be provided on the second layer 230 so that light emitted from the light sources 220 may be diffused upward. The diffusion plate 245 may be attached to the second layer 230, or may be attached using an additional adhesive member.

The backlight unit 200 of the present invention configured as described above may be adjusted in each thickness range for efficient use of the light provided to the display panel.

In more detail, the entire thickness a of the backlight unit 200 may be 1.7 to 3.5 mm, for example, 2.8 mm. The thickness b of the first layer 210 constituting the backlight unit 200 may be 0.2 to 0.8 mm, for example, 0.5 mm. In addition, the thickness c of the reflective layer 240 formed on the first layer 210 may have a thickness of 0.02 to 0.08 mm, for example, 0.05 mm.

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

Here, as the thickness e of the second layer 230 increases, the light emitted from the light source 220 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 e 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 significantly reducing the brightness of the light provided from the backlight unit 200 to the display panel, the thickness e of the second layer 230 is equal to the thickness of the light source 220. It is preferably the same as d) or 1.5 times or less of the thickness d of the light source 220.

4 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 illustrated backlight unit 200 is the same as that described with reference to FIGS. 2 and 3. Description will be omitted below.

Referring to FIG. 4, 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.

5 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. 5, 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.

6 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. 6, each of the plurality of light sources 220 provided in the backlight unit 200 has a light emitting surface disposed on a side thereof, and a side direction thereof, for example, the first layer 210 or the reflective layer 240 extends. 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 second 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 second 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.

7 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. 7 to 13 may emit light in a lateral direction from the side of the light source as illustrated in FIG. 6, but is not limited thereto. For example, the plurality of light sources 220 illustrated in FIG. May emit.

Referring to FIG. 7, a pattern layer including a plurality of first patterns 232 may be formed above 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.

7 to 10, the plurality of first patterns 232 are formed to correspond to the positions of the light sources 220, respectively, as illustrated in FIG. 7 to form a central portion 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. 8, 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 rather than 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. 8. 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. 9, 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. 8.

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. 8, for example, the light emitting surface of the light source 220 and the first The left end portion of the pattern 232 may be formed to overlap.

Meanwhile, referring to FIG. 10, the first pattern 232 may be formed at a position more biased in the direction in which light is emitted than in the case illustrated in FIG. 9. That is, 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, so that the left end portion of the first pattern 232 emits light from the light source 220. It may be formed spaced apart from the surface by a predetermined interval.

In addition, as shown in FIG. 11, the first pattern 232 may be formed inside the second layer 230. In this case, as shown in FIGS. 8 to 10, 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. 12, 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.

In addition, referring to FIG. 13, a plurality of first patterns 232 may be formed on one surface of the diffusion plate 245 described above with reference to FIG. 3. In this case, the first pattern 232 is coated on one surface of the diffusion plate 245, and the diffusion plate 245 is formed on the second layer 230 such that the first pattern 232 abuts on the second layer 230. ) Can be formed on.

Meanwhile, as the ratio of the area where the first pattern 232 is formed increases, the aperture ratio decreases, so that the overall luminance of the 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. 8 to 10, 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 to the center of the first pattern 232. 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 of FIG. 15, and accordingly, only a portion of the region where the light source 220 is formed may be first. The 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 the 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. 8 to 10, 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 and 25 illustrate a backlight unit 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 c of the reflective layer 240 may be equal to or smaller than the height g of the light emitting unit 222, so that the light source 220 may be located above the reflective layer 240.

Therefore, the thickness c of the reflective layer 240 may be 0.02 mm or less and 0.08 nm or less. Here, when the thickness c of the reflective layer 240 is 0.02 mm or more, the reflective layer 240 may achieve a light reflectance in a reliable range, and when the thickness c of the reflective layer 240 is 0.08 mm or less, the light source Since the light emitting part 222 of the 220 is covered, there is an advantage that the light emitted from the light source 220 can be prevented from being lost.

Therefore, 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 c of the reflective layer 240 is 10 nm to 10 nm. It may be formed to 100㎛.

27 to 31 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. 29 shows the structure of the light source as seen from the front.

Referring to FIG. 27, the light source 220 includes a plurality of lead frames 321 and 322, and is connected to a mold unit 324 having a cavity 323 and the lead frames 321 and 322. The light emitting device 325 mounted in the cavity 323 and the color conversion layer 326 filled in the cavity 323 in which the light emitting device 325 is mounted may be included.

The light emitting device 325 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.

The light emitting device 325 may be divided into a horizontal type and a vertical type according to a structure.

28 is a view showing a horizontal structure (a) and a vertical structure (b) of the light emitting device 325.

Referring to FIG. 28, the light emitting device 325 of the horizontal structure a may include a substrate 340. Substrate 340 may be a single crystal substrate made of sapphire, spinel, silicon carbide, zinc oxide, magnesium oxide, GaN, AlGaN, AlN, NGO (NdGaO _3), LGO (LiGaO _2), LAO (LaAlO ₃₎ or the like.

The n-type semiconductor layer 341 may be positioned on the substrate 340. The n-type semiconductor layer 341 may be made of n-type gallium nitride (GaN), and may be doped with an n-type dopant to improve luminous efficiency. The n-type dopant may be formed of, for example, silicon (Si), germanium (Ge), cerium (Ce), tellurium (Te), carbon (C), or the like.

The active layer 342 may be positioned on the n-type semiconductor layer 341, and the active layer 342 may be formed of, for example, InGaN. In addition, a first electrode 345 spaced apart from the active layer 342 may be positioned on the n-type semiconductor layer 341. The first electrode 345 may be an n-type electrode, and may include, for example, at least one or more of chromium, nickel, or gold.

The p-type semiconductor layer 343 may be positioned on the active layer 342. The p-type semiconductor layer 343 may be made of p-type gallium nitride (GaN), and may be doped with a p-type dopant to improve luminous efficiency. The p-type dopant may be formed of, for example, zinc (Zn), magnesium (Mg), beryllium (Be), calcium (Ca), strontium (Sr), or barium (Ba).

The second electrode 344 may be positioned on the p-type semiconductor layer 343. The second electrode 344 may be a p-type electrode, and for example, may be made of at least one of chromium, nickel, and gold.

In the light emitting device 325 of the vertical structure b, the p-type semiconductor layer 343 is positioned on the second electrode 344, and the active layer 342 is positioned on the p-type semiconductor layer 343. The n-type semiconductor layer 341 may be disposed on the active layer 342, and the first electrode 345 may be stacked on the n-type semiconductor layer 341.

When the voltage is applied to the first electrode 344 and the second electrode 345, the light emitting device 325 combines holes and electrons in the active layer 342, and thus, is formed in the height difference (energy gap) of the conduction and home appliances. It can be operated on the principle of emitting the corresponding light energy.

Referring to FIG. 27 again, the light emitting device 325 may be packaged in a mold part 324 constituting the body of the light source 220. For this purpose, the mold part 324 may include a cavity 323 at a central side thereof. Can be formed. Meanwhile, the mold part 324 may be injection molded to a press (Cu / Ni / Ag substrate) using a resin material such as PPA (high-reinforced plastic), and the cavity 323 of the mold part 324 serves as a reflective cup. Can be done. The shape or structure of the mold unit 324 may be changed, but is not limited thereto.

The plurality of lead frames 321 and 322 may penetrate in the long axis direction of the mold 324, and each end 327 and 328 may be exposed to the outside. Here, the mold part 324 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 element 325 is disposed, and is called short axis of symmetry axis in the short direction.

In addition to the light emitting device 325, semiconductor devices such as a light receiving device and a protection device may be selectively mounted on the lead frames 321 and 322 in the cavity 323. That is, not only the light emitting device 325 but also a protection device such as a zener diode for protecting the light emitting device 325 from electrostatic discharge (ESD) may be mounted on the lead frames 321 and 322 together.

The light emitting device 325 may be bonded to any one of the lead frames 322 disposed on the bottom surface of the cavity 323 and then connected to each other by wire bonding or flip chip bonding.

In addition, after the light emitting device 325 is connected to the inside of the cavity 323, the color conversion layer 326 is filled into the mounting area. The color conversion layer 326 includes a liquid resin 326a and a phosphor 326b. can do.

The liquid resin 326a may be made of silicon or epoxy, and may be made of a transparent material. The liquid resin 326a may further include a diffusion agent, and for example, barium titanate, titanium oxide, aluminum oxide, silicon oxide, or the like may be used as the diffusion agent.

In addition, the phosphor 326b is associated with the color of light emitted from the light emitting device 325. For example, when the light emitting device 325 emits blue, the phosphor 326b emits yellow, and Yttrium Aluminum Garnet. May be).

The light source according to the present embodiment may implement white light in various ways. As a method of implementing white light, a method of using a yellow phosphor on a blue light emitting device, a method of using red, green, and blue multilayer phosphors in a UV light emitting device, and three light emitting devices of red, green, and blue And a light emitting element having a complementary color relationship, for example, a method of mounting a blue light emitting element and an orange light emitting element in a light source.

Meanwhile, 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. 29, the head portion 331, which is a portion of light emitted from the light source 220, is actually a light emitting surface 332 from which light is emitted and a non-light emitting surface 333 from which light is not emitted. It may include.

More specifically, the light emitting surface 332 from which the light is emitted from the head portion 331 of the light source 220 is formed by the mold portion 324 by the cavity 323 in which the light emitting element 325 is disposed. Can be defined. For example, the light emitting device 325 is disposed in the cavity 323 of the mold part 324, so that light emitted from the light emitting device 325 may be emitted through the light emitting surface surrounded by the mold part 324. have. In addition, the non-light emitting surface 333 of the head portion 331 of the light source 220 may be a portion where the mold portion 324 is formed so that light is not emitted.

In addition, the light emitting surface 332 of the head portion 331 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 332 of the head 331 is not limited thereto, and for example, the light emitting surface 332 of the light source 220 may have a rectangular shape.

The non-light emitting surface 333 that does not emit light may be positioned on the upper, lower, left, or right side of the light emitting surface 332 of the head part 331 of the light source 220.

Meanwhile, one ends 327 and 328 of the lead frames 321 and 322 extend to the outside of the molding part 324 to be primarily formed, and secondly formed into one groove of the molding part 324 to be formed. The first and second lead electrodes 329 and 330 may be disposed. Here, the number of forming may be changed, but is not limited thereto.

The first and second lead electrodes 329 and 330 of the lead frames 321 and 322 may be formed to be received in grooves formed at both sides of the bottom surface of the molding part 324. In addition, the first and second lead electrodes 329 and 330 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.

As such, the light source 220 of the present invention may be disposed on the backlight unit 200.

30 is a view illustrating a backlight unit 200 including a light source of the present invention.

Referring to FIG. 30, the light source 220 is positioned on the first layer 210 described above, and the reflective layer 230 is positioned in an area except for an area where the light source 220 is formed on the first layer 210. The second layer 230 may be located to cover all of them.

The light source 220 formed on the first layer 210 includes a plurality of lead frames 321 and 322, a mold unit 324 in which a cavity 323 is formed, and the lead frames 321 and 322. The light emitting device 325 mounted in the cavity 323 and the color conversion layer 326 filled in the cavity 323 in which the light emitting device 325 is mounted may be included.

In particular, the surface 326c of the color conversion layer 326 may be formed in a concave lens shape concave with respect to the top of the cavity 323.

The color conversion layer 326 includes a liquid resin 326a and a phosphor 326b. The color conversion layer 326 is located in the cavity 323, protects the light emitting device 325, and controls the color of light emitted from the light emitting device 325. It can play a role.

Here, the surface 326c of the color conversion layer 326 may have a concave lens shape concave with respect to the top of the cavity 323. The surface 326c of the color conversion layer 326 is an area in which light emitted from the light emitting element 325 is emitted out of the color conversion layer 326, depending on the shape of the surface 326c of the color conversion layer 326. The degree of refraction of light emitted from the light emitting element 325 may vary.

In the present invention, the surface 326c of the color conversion layer 326 is formed in a concave lens shape concave with respect to the upper end of the cavity 323, so that the light diffused from the light emitting element 325 (the surface of the color conversion layer 326) And refracted at 326c to be emitted in parallel with the first layer 210.

As described above, a plurality of light sources 220 are disposed in the backlight unit 200 of the present invention, and light must reach the adjacent light sources 220. Referring to FIG. 3, light emitted from one light source 220 needs to reach another light source 220 adjacent to a direction in which light is emitted, so that the luminance of the backlight unit 200 may be uniform.

Accordingly, in the present invention, the light emitted from the light emitting element 325 is refracted at the surface 326c of the color conversion layer 326 to be emitted in parallel with the first layer 210, thereby allowing the light to be adjacent to the light source 220. There is an advantage that the brightness of the backlight unit 200 can be made uniform.

In addition, the concave depth of the surface 326c of the color conversion layer 326 may be in a predetermined range according to optical characteristics. That is, the depth j of the concave surface 326c of the color conversion layer 326 may be 1 to 30% of the depth k from the top of the light emitting device 325 to the top of the cavity 323. .

If the depth j of the surface 326c of the color conversion layer 326 is 1% or more with respect to the depth k from the upper end of the light emitting element 325 to the upper end of the cavity 323, the light emitting element ( The light emitted from 325 is refracted at the surface 326c of the color conversion layer 326 to be emitted in parallel with the first layer 210, so that light reaches the adjacent light source 220 to the light source 220. There is an advantage that the luminance can be made uniform. Further, when the depth j of the surface 326c of the color conversion layer 326 is 30% or less with respect to the depth k from the upper end of the light emitting element 325 to the upper end of the cavity 323, the light emitting element ( The light of the specific color emitted from the 325 serves as a buffer that can be sufficiently converted to the specific color by the phosphor 326b, and thus, the color of the light may be sufficiently realized. For example, when blue light is emitted from the light emitting device 325 and the phosphor 326b is yellow, white light may be emitted from the light source 220 by the blue light and the yellow phosphor 326b.

Meanwhile, referring to FIG. 30, the second layer 230 may be formed on the light source 220 to include the light source 220. In particular, the surface 326c of the color conversion layer 326 of the light source 220 may be in contact with the second layer 230.

The second layer 230 may be made of resin and may have a predetermined adhesive force. Here, when the surface 326c of the color conversion layer 326 of the light source 220 is formed into a concave lens shape, the surface 326c of the color conversion layer 326 can effectively adhere to the second layer 230. The area can be widened. Therefore, as the effective adhesion area between the second layer 230 made of resin and the surface 326c of the color conversion layer 326 is improved, the adhesion between the second layer 320 and the color conversion layer 326 is improved. There is an advantage that can be.

Therefore, the light source provided in the backlight unit of the present invention can improve the straightness of the light so that the light emitted from the light source can reach the adjacent light source by forming the surface of the color conversion layer in a concave lens shape. In addition, there is an advantage that the adhesion effective area between the color conversion layer and the second layer can be improved, thereby improving the adhesion between the color conversion layer and the second layer.

In addition, referring to FIG. 30, in the optical assembly of the present invention, a plurality of light sources 220 are positioned on the first layer 210, and a second layer (2) surrounding at least a portion of the light source 220 is disposed on the light source 220. 230 may be located.

As described above, the light source 220 of the present invention may include the light emitting device 325, and a lot of heat may be generated when the light emitting device 325 is driven. Accordingly, in the backlight unit of the present invention, the height m from the top of the first layer 210 to the top of the second layer 230 is the height from the top of the first layer 210 to the top of the light source 220. It may be greater than or equal to (n).

Here, if the height m from the top of the first layer 210 to the top of the second layer 230 is equal to the height n from the top of the first layer 210 to the top of the light source 220, The heat generated from the light emitting device 325 of the light source 220 may be easily released to the outside through the second layer 230. Further, if the height m from the top of the first layer 210 to the top of the second layer 230 is greater than the height n from the top of the first layer 210 to the top of the light source 220, The light source 220 may be protected from an external shock. Preferably the height m from the top of the first layer 210 to the top of the second layer 230 is similar to the height n from the top of the first layer 210 to the top of the light source 220. can do.

In addition, the light emitting device 325 of the light source 220 may contact the color conversion layer 326 covering the light emitting device 325, and the color conversion layer 326 may contact the second layer 230. As described above, when the light emitting device 325 of the light source 220 is driven, heat may be generated from the light emitting device 325.

In the present invention, the color conversion layer 326 and the second layer 230 made of a resin contact each other on the light emitting device 325, and heat generated from the light emitting device 325 is separated from the light emitting device 325. The contact is conducted through the color conversion layer 326, the conducted heat of the color conversion layer 326 may be emitted to the outside through the second layer 230 in contact with the color conversion layer 326.

Therefore, since heat generated from the light emitting element 325 can be easily discharged to the outside, the reliability of the backlight unit can be prevented from being deteriorated from the heat of the light emitting element 325.

In the light source 220 of the present invention having the structure as described above, light emitted from the light emitting element 325 may pass through the color conversion layer 326 and pass through the second layer 230 in contact with the color conversion layer 326. Can be. That is, the light emitted from the light emitting element 325 may be emitted to the display panel in the order of the color conversion layer 326 and the second layer 230.

Meanwhile, referring to FIG. 31, the structure of the light source 220 may be divided into a lead type, a SMD type, and a flip chip type according to the packaging form of the LED chip. The structure of the light source 220 of the present invention is not limited to the above-described FIGS. 28 and 30, but may also be a lead, SMD, or flip chip type structure illustrated in FIG. 31.

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

Referring to FIG. 32, the first light source 220 and the second light source 225 of the plurality of light sources included in the backlight unit 200 may emit light in different directions.

For example, the first light source 220 emits light in the lateral direction, and 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. 32, 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.

33 to 37 are views illustrating a front shape of the backlight unit according to the embodiment of the present invention.

Referring to FIG. 33, 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 above of a plurality of light source lines formed by the plurality of light sources, and the second light source array A2 is formed from above. It may be configured to include even-numbered light source lines.

The first light source line L1 included in the first light source array A1 and the second light source line L2 included in the second light source array A2 are disposed vertically adjacent to each other, and the first light source line L1 is disposed. ) And the second light source line L2 may be alternately arranged to constitute 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. 34, 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 the 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. 35, 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.

The second light source 221 included in the second light source array A2 may be disposed to correspond to a position between the first light source 220 and the third light source 222 adjacent to each other included in the first light source array A1. Can be.

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 the light emitted from the second light source 221 toward the display panel 100 in the region adjacent to the third light source 222. The brightness 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. 36, a direction in 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, referring to FIG. 37, 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.

38 and 39 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. 38, a backlight unit according to an exemplary embodiment may include a plurality of diffusion patterns for facilitating propagation of light emitted from the light source 220 onto an adjacent light source 225 on the reflective layer 240. 241 may be formed. The plurality of diffusion patterns 241 may diffuse or refract the light emitted from the light source 220.

More specifically, referring to FIG. 39, the backlight unit 200 may include two or more light sources emitting light in different directions.

The backlight unit 200 may include a first light source 225 and a second light source 226 that side-emit light in a direction parallel to the x-axis, that is, in the same direction, and the first light source 225 and the second light source 225. The light sources 226 may be disposed adjacent to each other in the x-axis direction in which light is emitted.

The first light source 225 and the second light source 226 are arranged perpendicular to the arranged x-axis direction, and emit light in a direction opposite to the first light source 225 and the second light source 226. The third light source 227 and the fourth light source 228 may be disposed. That is, the rows in which the first light source 225 and the second light source 226 are arranged and the rows in which the third light source 227 and the fourth light source 228 are arranged may cross each other.

Therefore, by forming the light emission directions of the first light source 225 and the second light source 226, the third light source 227 and the fourth light source 228 in the opposite direction, a specific region of the backlight unit 200. In this case, the phenomenon in which the brightness of light is concentrated or weakened can be reduced.

In this case, the light emitted from the first light source 225 may be weakened as it proceeds to the second light source 226. Thus, the farther from the first light source 225, the light emitted from the first light source 225 is directed toward the display panel. The brightness of the light may be weakened.

Therefore, in the seventh exemplary embodiment of the present invention, the plurality of diffusion patterns 241 may be disposed between the first light source 225 and the second light source 226. The plurality of diffusion patterns 241 may diffuse or refract the light emitted from the first light source 225 to emit light of uniform brightness from the backlight unit 200.

The plurality of diffusion patterns 241 may include at least one of a metal or a metal oxide that is a reflective material. For example, aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO ₂ ) It may be configured to include a metal or a metal oxide having a high reflectance, such as.

In this case, the plurality of diffusion patterns 241 may be formed by depositing or coating the metal or metal oxide on the first layer 210, or may be formed by printing 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.

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

The plurality of diffusion patterns 241 may include a plurality of dots each including the material. For example, each of the diffusion patterns 241 may be formed of a circular dot of each planar shape, or may be formed of an ellipse or a polygon.

The plurality of diffusion patterns 241 may increase in density from the first light source 225 to the second light source 226. Accordingly, it is possible to prevent the luminance of light emitted upward from an area far from the first light source 225, that is, from the rear region of the second light source 226, to be prevented from decreasing, thereby reducing the luminance of the light provided from the backlight unit 200. The brightness can be kept uniform.

For example, in the plurality of diffusion patterns 241 made of dots, an interval between two adjacent diffusion patterns may increase from the light emitting surface of the first light source 225 to the second light source 226. Light emitted from the first light source 225 may be diffused or refracted toward the second light source 226 to maintain uniform brightness.

In particular, the plurality of diffusion patterns 241 may be hardly present in an area adjacent to the first light source 225. Accordingly, the light emitted from the first light source 225 is totally reflected by the lower reflective layer 240 in the region where the diffusion patterns 241 do not exist, and the region where the diffusion patterns 241 exist. In FIG. 2, the luminance of the entire region including the region adjacent to the second light source 226 may be uniformly diffused or refracted.

Meanwhile, a plurality of diffusion patterns 241 may be disposed between the third and fourth light sources 227 and 228 that emit light in a direction opposite to the first and second light sources 225 and 226. have.

As described above, the density of the plurality of diffusion patterns 241 may increase from the light emitting surface of the third light source 227 to the fourth light source 228. In addition, an interval between two adjacent diffusion patterns 241 among the plurality of diffusion patterns 241 disposed between the third light source 227 and the fourth light source 228 may be adjusted from the light emitting surface of the third light source 227. 4 may decrease toward the light source 228.

In addition, the third light source 227 may be disposed on a diagonal line in the direction of the emission surface of the first light source 225, and a plurality of diffusion patterns 241 may be arranged in a line on the diagonal line. Because of this, since the directions of the light emitted from the first light source 225 and the light emitted from the third light source 227 are opposite to each other, the light of the first light source 225 and the light of the third light source 227 are mutually different. Luminance may be increased in overlapping and overlapping regions. Therefore, the plurality of diffusion patterns 241 are positioned on the diagonals of the first light source 225 and the third light source 227, thereby preventing the luminance from being increased in the overlapping region of the light.

Therefore, as illustrated in FIG. 39, the planar shape formed by the plurality of diffusion patterns 241 disposed between the first light source 225 and the second light source 226 may be the third light source 227 and the fourth light source. A plurality of diffusion patterns 241 disposed between 228 may be formed symmetrically with each other.

For example, the planar shape formed by the plurality of diffusion patterns 241 disposed between the first light source 225 and the second light source 226 or between the third light source 227 and the fourth light source 228 is a fan shape. It may be made in a shape.

Such a fan shape is arranged to correspond to the direction of the light emitted from the light source is about 120 degrees, thereby efficiently transmitting and diffusing the light emitted from the light source, thereby maintaining the overall brightness of the backlight unit uniformly.

40 to 45 illustrate a backlight unit according to an eighth embodiment of the present invention.

As described above with reference to FIGS. 2 to 39, the backlight unit of the present invention includes a first layer 210, a plurality of light sources 220 disposed on the first layer 210, and a plurality of light sources ( It has been described that it comprises a second layer 230, a reflective layer 240 disposed between the first layer 210 and the second layer 230 surrounding the 220.

40 to 61 illustrate a backlight unit according to an eighth embodiment of the present invention. In the following description of the same components as in the first to seventh embodiments will be omitted.

40, 42, 43, 44, 46 and 48 show the front shape of the backlight unit, FIG. 41 is a sectional view taken along the line Q-Q 'of FIG. 40, and FIG. 45 shows the manufacturing process of the backlight unit of FIG. FIG. 47 is a cross-sectional view taken along the line R-R 'of FIG. 46, FIG. 49 is a cross-sectional view taken along the line S-S' of FIG. 48, FIG. 50 is an enlarged view of an O region of FIG. FIG. 46 illustrates a manufacturing process of the backlight unit of FIG. 46.

40 and 41, the backlight unit 200 according to the eighth embodiment of the present invention is positioned on the plurality of first layers 210 and the plurality of first layers 210, and receives light. At least one reflective layer 240 and a plurality of first layers 210 positioned on the plurality of first layers 210 except for the plurality of light sources 220 and the plurality of light sources 220 that emit. The light emitting device may include a second layer 230 positioned on the at least one reflective layer 240 and surrounding at least a portion of the plurality of light sources 220.

In more detail, the first layers 210 may be divided into a plurality of parts and arranged side by side in the x-axis direction on the same plane. The plurality of divided first layers 210 may be formed of one disc in contact with each other.

In addition, a plurality of light sources 220 emitting light may be disposed in the first layers 210, and the reflective layer 240 may be positioned on the first layers 210 except for the plurality of light sources 220. .

As described above with reference to FIGS. 38 and 39, a plurality of diffusion patterns may be disposed in the reflective layer 240 to reflect light emitted from the light source 220 to an adjacent light source or an upper portion thereof.

The reflective layer 240 may be formed of at least one of metal or metal oxide, which is a reflective material, and may be formed on the first layer 210 in the form of a deposition, a coating, or a sheet.

In addition, a second layer 230 is positioned in front of the first layers 210 having the plurality of light sources 220 and the reflective layer 240 to diffuse light emitted from the light sources 220 into the surface light source. I can change it.

The backlight unit 200 according to the eighth embodiment of the present invention configured as described above includes a second layer 230 covering the plurality of light sources 220 and the reflective layer 240 disposed on the plurality of first layers 210. ) Is formed and may be configured as one backlight unit 200.

Unlike the foregoing, the plurality of divided first layers 210 of the present invention may be arranged side by side in M (M is one or more natural numbers) in the x-axis direction.

As illustrated in FIG. 40, four first layers 210 may be disposed in the backlight unit 200. However, FIG. 40 is only an example for describing the backlight unit according to the present invention. It is not limited and may be changed according to the screen size of the display device.

For example, as illustrated in FIG. 42, two first layers 210 may be disposed to implement the backlight unit 200, and as illustrated in FIG. 43, six first layers 210 may be formed. It may be arranged to implement the backlight unit 200. In addition, as illustrated in FIG. 44, eight first layers 210 may be disposed to implement the backlight unit 200. According to the present invention, in the case of a large-screen display device, the backlight unit 200 may be configured by arranging ten or more first layers 210.

The backlight unit 200 configured as described above may be manufactured as shown in FIG. 45.

As shown in FIG. 45A, a plurality of light sources 220 are respectively formed on the plurality of first layers 210a, 210b, 210c, and 210d by soldering. As shown in FIG. 45B, the first layers 210a, 210b, 210c, and 210d manufactured, respectively, are bonded to each other to form a first layer 210.

Subsequently, as shown in FIG. 45C, the reflective layer 240 covering the entire surface of the first layer 210 is formed on the first layer 210. As shown in FIG. 45D, the backlight unit of the present invention is formed by forming a second layer 230 on the first layer 210 on which the reflective layer 240 is formed by adhesion or coating. It can manufacture.

As described above, the plurality of light sources 220 disposed on the first layers 210 and the first layers 210 may be independently manufactured, and may be disposed in close proximity to each other to form a modular backlight unit. . Such a modular backlight unit can provide light to the display panel as a backlight means.

On the other hand, the above-described reflective layer 240 may be made of two or more. Hereinafter, an example in which four first layers 210 are formed will be described.

46 and 47, the first layers 210 are divided into a plurality of parts, and are arranged side by side in the x-axis direction on the same plane, and the first layers 210 each include a plurality of light sources emitting light. 220 may be disposed, and at least two reflective layers 240 of the first layers 210 except for the plurality of light sources 220 may be positioned.

The reflective layer 240 may be formed of at least one of metal or metal oxide, which is a reflective material, and may be formed on the first layer 210 in the form of a deposition, a coating, or a sheet. In particular, in the present exemplary embodiment, two or more sheet-shaped reflective layers 240 may be disposed on the first layers 210, respectively.

In addition, a second layer 230 is positioned in front of the first layers 210 having the plurality of light sources 220 and the reflective layer 240 to diffuse light emitted from the light sources 220 into the surface light source. I can change it.

The reflective layer 240 may be provided with a plurality of holes in an area corresponding to the position of the light source 220. The reflective layer 240 may be arranged in a plurality of light sources 220 rather than being aligned with the plurality of light sources 220 simultaneously. Aligning each of the sheet-shaped reflective layers 240 to the light source 220 may be better in terms of productivity and reliability.

As illustrated in FIG. 46, five reflective layers 240 may be disposed in the backlight unit 200. However, since the backlight unit 200 is only an example for describing the backlight unit according to the present invention, the present invention is not limited thereto. It may be changed according to the screen size of the display device.

For example, as illustrated in FIGS. 47 and 48, three reflective layers 240 may be disposed to implement the backlight unit 200. Although not shown, the backlight unit 200 may be formed of six or more reflective layers 240. ) Can also be implemented.

Referring to FIG. 49, boundaries of the plurality of reflective layers 240 formed on the plurality of first layers 210 may appear. Here, the boundary 213 between the first layers 210 may be spaced apart from each other without the boundary 243 between the reflective layers 240.

In more detail, the boundary 213 between the first layers 210 may not be disposed on the same line in the y-axis direction as the boundary 243 between the reflective layers 240. In other words, the boundary 213 between the first layers 210 may not be disposed on the same line in the y axis direction as the boundary 243 between the reflective layers 240, but may be spaced apart from each other in the x axis direction.

Here, a step may appear at the boundary 213 between the first layers 210. Such a step may reflect light emitted from the light sources 220 to reduce light efficiency. In the present exemplary embodiment, the step that may appear at the boundary 213 between the first layers 210 may be covered with the reflective layer 240 to remove the step. Therefore, it is possible to prevent the light efficiency of the light source 220 from being lowered.

Meanwhile, the backlight unit 200 configured as described above may be manufactured as shown in FIG. 51.

As illustrated in FIG. 51A, a plurality of light sources 220 are formed on the plurality of first layers 210a, 210b, 210c, and 210d through soldering, respectively. As shown in FIG. 51B, the first layers 210a, 210b, 210c, and 210d manufactured, respectively, are bonded to each other to form a first layer 210.

Subsequently, as illustrated in FIG. 51C, a plurality of light sources 220 are formed by aligning the plurality of reflective layers 240a, 240b, 240c, 240d and 240e on the first layer 210. Adhesion on layer 210. Accordingly, as illustrated in FIG. 51D, the reflective layer 240 may be formed to surround the light source 220 on the first layer 210.

As shown in (e) of FIG. 51, the backlight unit of the present invention is formed by forming a second layer 230 on the first layer 210 on which the reflective layer 240 is formed by adhesion or coating. It can manufacture.

As described above, the plurality of light sources 220 disposed on the first layers 210 and the first layers 210 may be independently manufactured, and may be disposed in close proximity to each other to form a modular backlight unit. . Such a modular backlight unit can provide light to the display panel as a backlight means.

Meanwhile, the backlight unit 200 of the present invention may further include a transparent film 260 having a first pattern 232 formed on the second layer 230.

FIG. 52 is a view illustrating a front shape of the backlight unit of the present invention, FIG. 53 is a cross-sectional view taken along line VV ′ of FIG. 52, and FIG. 53 is an enlarged view of region P of FIG. 52.

52 and 53, a plurality of light sources 220 are disposed on the plurality of divided first layers 210, and a plurality of reflective layers 240 are disposed on the first layers 210. The light source 220 and the second layer 230 covering the reflective layer 240 may be disposed on the first layer 210.

In particular, in the present exemplary embodiment, the transparent film 260 having the first pattern 232 formed on the second layer 230 may be further provided.

The first pattern 232 is as described above with reference to FIGS. 7 to 21, and may be disposed on the light source 220 to prevent a hot spot phenomenon generated from the light source 220. In addition, the diffusion plate 245 may be disposed on the transparent film 260 to diffuse light emitted through the transparent film 260.

Referring to FIG. 54, in the present exemplary embodiment, the first pattern 232 may be located on the boundary 213 of the first layer 210 appearing between the plurality of first layers 210.

In more detail, the first pattern 232 may be disposed to cover the upper portion of the light source 220, and may also be disposed in a shape to cover the boundary 213 of the first layer 210. That is, when the boundary 213 of the first layer 210 extends in the direction opposite to the y-axis direction, the first pattern 232 may be disposed to contact the first pattern 232.

Therefore, as described above, the light emitted from the light source 220 is reflected upward by the step that may appear at the boundary 213 of the first layer 210, thereby preventing the occurrence of the hot spot phenomenon. There is an advantage.

Meanwhile, the backlight unit 200 of the present invention may further include a transparent film 260 having a first pattern 232 and an adhesive layer 239 formed on the second layer 230.

55 and 57 are views illustrating a front surface of the backlight unit of the present invention, and FIG. 56 is a cross-sectional view taken along line XX ′ of FIG. 55.

55 and 56, in the backlight unit 200 of the present invention, an adhesive layer 239 may be further formed on the transparent film 260 on which the first patterns 232 are formed.

The adhesive layer 239 may bond the transparent film 260 and the second layer 230, and may form and maintain an air layer 238a between the transparent film 260 and the second layer 230. . The air layer 238a may have a refractive index of 1 substantially different from that of the second layer 230 and that of the transparent film 260. Accordingly, the formation of the air layer 238a may result in the formation of another layer having a different refractive index, that is, the air layer 238a, between the second layer 230 and the transparent film 260, and thus The light emitted by the light source 220 may diffuse more effectively.

In addition, the diffusion plate 245 may be positioned on the transparent film 260. Since the diffuser plate 245 has a rigid plate shape, the diffuser plate 245 may serve as a support for other functional layers, and diffuse light incident from the light source 220.

Although not shown, the diffusion plate 245 may include a plurality of beads, and scatter the light incident using the beads to prevent the light from being concentrated at a specific portion.

The adhesive layer 239 may be applied in the form of a line between the light sources 220. As illustrated in FIG. 57, the adhesive layer 239 may be applied in the form of dots between the light sources 220, but is not limited thereto.

FIG. 58 is a view illustrating the rear surface of the backlight unit of FIG. 40, FIG. 59 is a view illustrating the perspective view of FIG. 58, FIG. 60 is a view illustrating the rear surface of the backlight unit of FIG. 42, and FIG. 61 is a perspective view of FIG. 60. The figure shown.

Referring to FIG. 58, at least one connector 215 may be positioned on the rear surface of the plurality of first layers 210. The first layers 210 may be PCB substrates that apply current to the plurality of light sources 220, and the connector 215 disposed on the first layer 210 may apply current to the plurality of light sources 220 from the outside. Can play a role.

The connector 215 may be located at the rear of each of the first layers 210 and may be disposed adjacent to one side or the other side of the first layers 210.

In more detail, each of the plurality of first layers 210 may include a connector 215. Here, according to the position of the connector 215, the plurality of first layers 210 may include a first substrate 211 in which the connector 215 is disposed adjacent to one side of the first layer 210, and the connector 215. The second substrate 212 may be disposed adjacent to the other side of the first layer 210.

As shown in FIG. 58, the first substrate 211 having the connector 215 disposed adjacent to one side of the first layer 210 and the connector 215 disposed adjacent to the other side of the first layer 210. The second substrate 212 may be alternately disposed.

That is, among the plurality of first layers 210, the first layers 210 having the same position of the connector 215 may be alternately disposed with the first layers 210 having different positions of the connector 215. have.

Accordingly, the connector 215 of the first board 211 and the connector 215 of the second board 212 may be disposed adjacent to each other.

Referring to FIG. 59, the backlight unit 200 is in close contact with the bottom plate 135. At this time, the bottom plate 135 is applied to apply current to the backlight unit 200 through the bottom plate 135 from the outside. Hole 350 is disposed.

For example, when two pairs of the connector 215 of the first board 211 and the connector 215 of the second board 212 are disposed adjacent to each other, two holes 350 are formed in the bottom plate 135. Only can be provided.

Alternatively, referring to FIGS. 60 and 61, a backlight unit may be formed of two first layers 210, that is, the first substrate 211 and the second substrate 212. Therefore, when a pair of the connector 215 of the first board 211 and the connector 215 of the second board 212 is formed, only one hole 350 may be provided in the bottom plate 135.

As described above, when the connector 215 of the first substrate 211 and the connector 215 of the second substrate 212 are disposed adjacent to each other, the first through the one hole 350 of the bottom plate 135 The connector 215 of the board 211 and the connector 215 of the second board 212 may be exposed.

Meanwhile, the above-described backlight unit 200 of the present invention may be driven in a whole driving method or a partial driving method 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 light sources 220 in one first layer 210 can be driven independently to emit light upwards, for which the light sources included in each of the first layers 210 ( 220 may be controlled independently of each other.

In addition, an area of the display panel 110 corresponding to the plurality of first layers 210 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. It may be.

As described above, by assembling the plurality of first layers 210 to configure the backlight unit 200, a manufacturing process of the backlight unit 200 may be simplified, and a loss that may occur in the manufacturing process may be reduced. Minimize your productivity. In addition, the backlight unit 200 has an effect that can be applied to backlight units of various sizes by mass-producing the first layer 210 as a standard.

Meanwhile, when a failure occurs in any one of the plurality of first layers 210 provided in the backlight unit 200, the replacement operation may be performed because only the optical assembly in which the failure occurs is replaced without the need to replace the entire backlight unit 200. It is easy to reduce the cost of replacement parts.

62 is a cross-sectional view illustrating a configuration of a display device according to a ninth embodiment of the present invention, and is taken along line U-U 'of FIG. 1. A description of the same configuration as that described with reference to FIGS. 1 to 61 among the configurations of the illustrated display device will be omitted.

Referring to FIG. 62, a display panel 110 including a first substrate 111, a second substrate 112, an upper polarizer 160a and a lower polarizer 160b, a first layer 210, and a plurality of The backlight unit 200 including the light sources 220 and the second layer 230 may be in close contact with each other.

For example, an adhesive 170 may be formed between the backlight unit 200 and the display panel 110 so that the backlight unit 200 may be adhered to and fixed to the lower side of the display panel 110.

More specifically, the upper surface of the backlight unit 200 may be adhered to the lower surface of the lower polarizer 160b by using the adhesive 170. The backlight unit 200 may further include a diffusion plate 245 on the second layer 230. In addition, a plurality of optical sheets (not shown) may be provided between the diffusion plate 245 and the adhesive layer 170.

The backlight unit 200 may include, for example, a plurality of light sources 220 arranged on the first layer 210, a reflective layer 240 formed around the plurality of light sources 220, and a reflective layer 240. The second layer 230 formed on the first layer 210, the transparent film 260 formed on the second layer 230, and the first pattern 232 formed thereon, and the diffusion plate formed on the transparent film 260. 245 may be included. However, the present invention is not limited thereto, and all of the above-described embodiments of FIGS. 2 to 78 are applicable.

In addition, a bottom plate 135 may be disposed below the backlight unit 200, and the bottom plate 135 may be formed to be in close contact with the bottom surface of the first layer 210.

The display device may include a driving unit for supplying driving signals and power to the display module, more specifically, the display panel 110 and the backlight unit 200. For example, the display device may be provided in the backlight unit 200. The plurality of light sources 220 may be driven by using a voltage supplied from the driver to emit light.

The driving unit may include a driving control unit 141, a power supply unit 143, and a main board 142. In order to stably support and fix the driving unit, the driving unit may include a driving unit chassis 145 disposed on the bottom plate 135. It can be placed on and fixed.

According to an embodiment of the present invention, a first connector 310 may be formed on the rear surface of the first layer 210, and a hole for inserting the first connector 310 into the bottom plate 135 is formed therefor. 350 may be formed.

The first connector 310 electrically connects the light source 220 and the power supply unit 143 so that a driving voltage can be supplied from the power supply unit 143 to the light source 220.

For example, the first connector 310 is formed on the lower surface of the first layer 210 and is connected to the power supply unit 143 using the first cable 410 to supply power through the first cable 421. The driving voltage supplied from the supply unit 143 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 141 for controlling driving of the display panel 100 and the backlight unit 200. For example, the driving controller 141 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. 62, in order to stably support and fix the driving control unit 141, the driving control unit 141 may be fixed on the driving unit chassis 145 disposed on the bottom plate 135.

According to an embodiment of the present disclosure, a second connector 320 may be formed on the substrate 210, and a hole 350 for inserting the second connector 320 is formed in the bottom plate 135. It may be.

The second connector 320 may electrically connect the first layer 210 and the driving controller 141 to supply the control signal output from the driving controller 141 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 141 using the second cable 420, and is driven through the second cable 420. The control signal supplied from the controller 141 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 driving controller 141 through the second connector 320. The light sources 220 may be driven.

In addition, the power supply unit 143 and the driving control unit 141 described above may be wrapped in the rear case 150 to be protected from the outside.

The configuration of the display device illustrated in FIG. 62 is only an embodiment of the present invention, and accordingly, the power supply unit 143, the driving control unit 141, the first and second connectors 310 and 320, and the first and the first devices The position or number of the two cables 410 and 420 can be changed as necessary.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it 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.

Claims (12)

A plurality of first layers;
A plurality of light sources positioned on the plurality of first layers and emitting light; And
At least one reflective layer positioned on the plurality of first layers, except for the plurality of light sources; And
And a second layer disposed on the plurality of first layers and surrounding at least a portion of the at least one reflective layer and the plurality of light sources.
The method of claim 1,
The plurality of light sources, the at least one reflective layer, and the second layer are positioned in front of the plurality of first layers,
And at least one connector on a rear surface of the plurality of first layers.
The method of claim 2,
And among the plurality of first layers, the first layers having the same position of the connector are alternately disposed with the first layers having different positions of the connector.
The method of claim 2,
The plurality of first layers,
And a first substrate having the connector disposed adjacent to one side of the first layer, and a second substrate having the connector disposed adjacent to the other side of the first layer.
The method of claim 4, wherein
And the first substrates and the second substrates are alternately disposed.
6. The method of claim 5,
The connector disposed on the first substrates is disposed adjacent to the connector disposed on the second substrates.
The method of claim 1,
The plurality of first layers are disposed side by side on the same plane.
The method of claim 1,
The reflective layer covers at least two or more adjacent to each other of the plurality of first layers.
The method of claim 8,
And the reflective layer covers a boundary of at least two first layers adjacent to each other.
At least one reflective layer located on the plurality of first layers, except for a plurality of first layers, a plurality of light sources positioned on the plurality of first layers, and emitting the light and the plurality of light sources; A backlight unit on the plurality of first layers, the backlight unit including a second layer surrounding at least a portion of the at least one reflective layer and the plurality of light sources;
A display panel on the backlight unit; And
And a bottom plate surrounding the backlight unit.
The method of claim 10,
The plurality of light sources, the at least one reflective layer, and the second layer are positioned in front of the plurality of first layers,
And at least one connector on a rear surface of the plurality of first layers.
12. The method of claim 11,
The bottom plate includes a hole positioned to correspond to the at least one connector.

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