KR101719652B1 - backlight unit and display apparatus - Google Patents

Abstract

A backlight unit according to an embodiment of the present invention includes a first layer, a plurality of light sources disposed on the first layer and emitting light in one direction, a plurality of light sources disposed on the first layer on which the plurality of light sources are disposed And an air layer positioned at least at a portion between the plurality of light sources and the second layer, wherein the plurality of light sources include a light emitting element and a phosphor and an encapsulant covering the light emitting element, The light emitted from the light emitting device may proceed in the order of the phosphor, the encapsulant, the air layer, and the second layer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight unit and a display apparatus,

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

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

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

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

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

The present invention provides a backlight unit and a liquid crystal display device capable of improving the image quality of a display image and reducing the thickness thereof.

In order to achieve the above object, a backlight unit according to an embodiment of the present invention includes a first layer, a plurality of light sources disposed on the first layer, the plurality of light sources emitting light in one direction, A second layer positioned on the first layer and an air layer positioned at least in part between the plurality of light sources and the second layer, wherein the plurality of light sources comprises a light emitting element and a light emitting element A phosphor, and an encapsulant, and the light emitted from the light emitting element may proceed in the order of the phosphor, the encapsulant, the air layer, and the second layer.

According to the direction in which the light is emitted, the light emitting element is in contact with the phosphor, the phosphor is in contact with the sealing material, the sealing material is in contact with the air layer, and the air layer is in contact with the second layer.

The plurality of light sources may include a plurality of lead frames, and may include a mold part having a cavity formed therein, a light emitting device connected to the lead frame, and the encapsulation material filled in the cavity in which the light emitting device is mounted, .

The phosphor may cover the entire surface of the light emitting device.

At least one light source of the plurality of light sources may be at least one side separated from the second layer.

The plurality of light sources may include a light emitting surface through which light is emitted, and at least one surface of the at least one light source spaced apart from the second layer may be the light emitting surface.

The air layer may be positioned between the light emitting surface and the second layer.

The thickness of the air layer located between the light emitting surface and the second layer may be thicker than the thickness of the air layer located between one side of the light source except for the light emitting surface and the second layer.

At least one light source of the plurality of light sources may be in contact with at least one side of the second layer.

The second layer may be a resin plate having a plurality of grooves corresponding to the plurality of light sources.

The second layer may be a resin film.

And a reflective layer between the first layer and the second layer.

Also, a display device according to an embodiment of the present invention may include a first layer, a plurality of light sources disposed on the first layer and emitting light, a plurality of light sources disposed on the first layer on which the plurality of light sources are disposed A second layer and an air layer located at least a part between the plurality of light sources and the second layer, the plurality of light sources covering the light emitting element and the light emitting element, Wherein the light emitted from the light emitting device includes a backlight unit that is driven in the order of the phosphor, the encapsulant, the air layer, and the second layer, and a display panel that is positioned on the backlight unit, May be divided into a plurality of blocks, and may be drivable on the divided blocks.

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

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

Further, by adjusting the structure of the backlight unit, white light of uniform brightness can be provided to the display panel, thereby improving the image quality of the display image.

1 shows a display device according to an embodiment of the present invention.
2 to 15 are views showing a backlight unit according to a first embodiment of the present invention.
16 to 23 show a backlight unit according to a second embodiment of the present invention.
24-27 illustrate the arrangement of a first pattern formed in a backlight unit according to an embodiment of the present invention.
Figures 28-31 illustrate shapes of a first pattern according to an embodiment of the present invention.
32 and 33 are views showing a backlight unit according to a third embodiment of the present invention;
34 and 35 show a backlight unit according to a fourth embodiment of the present invention.
36 to 45 show a backlight unit according to a fifth embodiment of the present invention.
46 is a view for explaining a positional relationship between a light source and a reflective layer provided in the backlight unit of the present invention;
Figs. 47 to 51 are views showing a structure of a light source provided in the backlight unit of the present invention. Fig.
52 to 55 are views showing a backlight unit and a light source of the present invention.
56 is a view showing a structure of a plurality of light sources provided in the backlight unit;
57 to 60 are views showing a front shape of a backlight unit according to an embodiment of the present invention.
61 and 62 show a backlight unit according to a sixth embodiment of the present invention.
63 to 73 show a backlight unit according to a seventh embodiment of the present invention.
74 shows a display device according to an eighth embodiment of the present invention.

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

1 is a view illustrating a display device according to an embodiment of the present invention.

1, a display device 100 according to an exemplary embodiment of the present invention includes a display panel 110, a backlight unit 120, a cover 130, a bottom plate 135, a driver 140, (150).

The display panel 110 may include a first substrate 111 and a second substrate 112 on which the liquid crystal layer is interposed between the first substrate 111 and the second substrate 112. Although not shown in the drawings, a plurality of pixels may be defined on the first substrate 111, which is referred to as a TFT array substrate, by intersecting a plurality of scan lines and data lines in a matrix form. Each pixel is provided with 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.

The second substrate 112, which is referred to as a color filter substrate, includes red (R), green (G), and blue (B) color filters respectively corresponding to a plurality of pixels, A black matrix for covering non-display elements such as transistors may be provided. Further, a transparent common electrode covering them may be provided.

A printed circuit board is connected to at least one side of the display panel 110 via a flexible circuit board or a connection member such as a tape carrier package (TCP), and is closely contacted to the back surface of the bottom plate 135 .

When the selected thin film transistor is turned on for each scan line by the on / off signal of the gate driving circuit 113 transmitted from the scan line, the display panel 110 having the above- The voltage is transmitted to the corresponding pixel electrode through the data line, and accordingly, the arrangement direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode, and the difference in transmittance can be exhibited.

Meanwhile, the display device 100 of the present invention may include a backlight unit 120 capable of providing light from the back surface of the display panel 110 to the display panel 110.

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

The display panel 110 and the backlight unit 120 described above can be modularized through the cover 130 and the bottom plate 135. The cover 130 located on the front surface of the display panel 110 may be a top cover and may have a rectangular frame shape covering the top and side surfaces of the display panel 110, 110). ≪ / RTI >

In addition, the bottom plate 135 may be positioned on the back surface of the backlight unit 120. The bottom plate 135 may be a bottom cover, and the display panel 110 and the backlight unit 120 may be combined to form a square plate.

The driving unit 140 may be disposed on one surface of the bottom plate 135 positioned on the back 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 and is a driving unit for adjusting the operation timing of each driving circuit of the display panel 110. The main board 142 may include a V-sync, an H- B resolution signal, and the power supply unit 143 is a driving unit for applying power to the display panel 110 and the backlight unit 120.

The driving unit 140 may be provided on one side of the bottom plate 135 positioned on the rear surface of the backlight unit 120 by the driving unit chassis 145. The driving unit 140 may be enclosed by the rear case 150.

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

2 to 15 are views showing 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 includes a first layer 210, a light source 220, a second layer 230, and a reflective layer 240 .

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

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

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

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

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

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

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

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

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

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

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

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

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

The second layer 230 may include a polymer resin. For example, the second layer 230 may comprise at least one of an unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, n-butyl methacrylate, n-butyl methyl methacrylate, Hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxyethyl acrylate, acrylamide, methylol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, n-butyl acrylate, 2 -Ethylhexyl acrylate polymer, a copolymer or a terpolymer, and the like, acrylic, urethane, epoxy, melamine and the like.

In addition, the first air layer 238a may be located at least partially between the second layer 230 and the light sources 220 in the present invention. The first air layer 238a is a region spaced apart from the second layer 230 and the light sources 220. The light emitted from the light source 220 is diffracted by the difference in refractive index at the interface of the first air layer 238a And may be a region to be mixed and diffused.

The first air layer 238a shown in Fig. 3 may be formed as follows. Referring to FIG. 4, a second layer 230 having a plurality of grooves 270 may be formed on a first layer 210 having light sources 220 formed thereon.

More specifically, a resin, which is the material of the second layer 230, is applied to the mold and cured to form a resin plate in which a plurality of grooves 270 corresponding to the light sources 220 are formed. The first air layer 238a may be formed by bonding a second layer 230 made of a resin plate onto the first layer 210 on which the light source 220 and the reflective layer 240 are disposed.

3, at least a part of the surface of the light source 220 is separated from the second layer 230 to form a first air layer 220 between the light source 220 and the second layer 230, (238a) may be formed.

The first air layer 238a mixes and diffuses the light emitted from the light source 220 using the difference in refractive index at the interface of the first air layer 238a to thereby realize white light of the light source 220 There is an advantage.

Referring to FIG. 5, such a backlight unit may be spaced apart from the second layer 230 on all sides of the light source 220. The thickness t1 of the first air layer 238a located between the light emitting surface 332 of the light source 220 and the second layer 230 is equal to the thickness t1 of the light source 220 excluding the light emitting surface 332 of the light source 220 220 may be thicker than the thickness t2 of the first air layer 238a located between one side of the first air layer 220 and the second layer 230. [ That is, as described above, the first air layer 238a located between the light emitting surface 332 of the light source 220 and the second layer 230 generates light mixing to realize white light. Therefore, the light source 220 The thickness t2 of the first air layer 238b located between the one side of the light source 220 and the second layer 230 excluding the light emitting surface 332 of the first air layer 238 may be thin.

6, the upper surface of the light source 220 contacts the second layer 230, and the surfaces including the remaining light emitting surface 332 are spaced apart from the second layer 230 , The first air layer 238a may be formed in a spaced gap.

7, which is a cross-sectional view taken along the line O-O 'in FIG. 58, the left and right sides of the light source 220 are spaced from the second layer 230 with reference to the light emitting surface 332 on which the light emitting device 325 is formed A first air layer 238a may be formed.

8, at least the light emitting surface 332 of the light source 220 is spaced apart from the second layer 230 so that the light emitting surface 332 of the light source 220 and the light emitting surface 332 of the light source 220 are separated from each other. The effect of the present invention can be achieved only if the first air layer 238a is present at least between the first and second layers 230a and 230b.

In the above embodiment, the second layer 230 is a resin plate formed on a mold. In the following description, the second layer 230 is a film or a liquid resin.

Referring to FIG. 9, the first air layer 238a may be located at least in part between the second layer 230 and the light sources 220. The first air layer 238a is a region spaced apart from the second layer 230 and the light sources 220. The light emitted from the light source 220 is diffracted by the difference in refractive index at the interface of the first air layer 238a And may be a region to be mixed and diffused.

The second layer 230 and the first air layer 238a shown in FIG. 9 may be formed as follows. Referring to FIG. 10, the second layer 230 is formed by applying the above-described resin onto the supporting sheet and partially drying the resin to form a sheet-like second layer 230, Or by directly applying the resin on the first layer 210 on which the light source 220 is formed and drying the resin.

In the method of forming the first air layer 238a by the drying method, it may be desirable to appropriately adjust the viscosity of the second layer 230 made of resin. When the second layer 230 is formed on the first layer 210 and then dried, the second layer 230 made of resin is shrunk and the first layer 230 is formed between the light source 220 and the second layer 230, An air layer 238a may be formed. The first air layer 238a is not formed on the upper side of the light source 220 having a large contact area with the second layer 230 and the first air layer 238a is formed on the side surfaces of the stepped light source 220, Can be formed.

11, which is a sectional view taken along the line O-O 'in FIG. 58, when the second layer 230 is formed in a sheet shape and is formed on the light sources 220, The second layer 230 may be formed to be convexly protruding from the upper portion of the light source 220 by the step of the light source 220, as shown in FIG.

On the other hand, when the second layer 230 is coated with the resin and formed on the light sources 220, as shown in FIG. 11 (b), the second layer 230 on the light source 220 The surface may be flat.

Accordingly, the first air layer 238a may be formed on the left and right sides of the light emitting surface 332 of the light source 220, with the light source 220 and the second layer 230 being separated from each other.

Referring to FIG. 12, a diffusion plate 245 may be provided on the second layer 230 so that light emitted from the light sources 220 may be diffused upward. The diffuser plate 245 may be adhered to the second layer 230 and adhered using an additional adhesive member.

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

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

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

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

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

13 shows a cross-sectional shape of a region of the backlight unit 200 where the light sources 220 are not positioned. In the structure of the backlight unit 200 shown in FIG. 13, The explanation will be omitted below.

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

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

14, the second layer 230 may include a plurality of scattering particles 231, and the scattering particles 231 scatter or refract incident light to form a light source 220, So that the light emitted from the light source can be diffused more widely.

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

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

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

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

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

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

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

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

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

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

15, a plurality of light sources 220 provided in the backlight unit 200 may have a light emitting surface disposed on a side surface thereof, for example, in a lateral direction, for example, the first layer 210 or the reflective layer 240, The light can be emitted in the extended direction.

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

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

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

16 to 23 are sectional views showing a backlight unit according to a second embodiment of the present invention. In the following description, the same reference numerals are given to the same components as those in the first embodiment described above, and a description thereof will be omitted.

The plurality of light sources 220 shown in FIGS. 16 to 23 may emit light in a lateral direction from the side surface of the light source as shown in FIG. 15, but the present invention is not limited thereto. For example, Lt; / RTI >

Referring to FIG. 16, a pattern layer including a plurality of first patterns 232 may be formed on a second layer 230 of the backlight unit 200 including the light sources 220, The plurality of first patterns 232 included in the pattern layer may be formed on the second layer 230 so as to correspond to the positions where the light sources 220 are disposed.

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

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

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

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

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

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

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

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

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

Referring to FIG. 16, a plurality of first patterns 232 are formed to correspond to positions of the light sources 220, respectively. The central portion of the first pattern 232 is formed to correspond to the central portion of the corresponding light source 220 as well as the center portion of the first pattern 232 is formed to correspond to the corresponding portion of the light source 220, And may be formed to be spaced apart from the center portion by a predetermined distance.

17, the center portion of the first pattern 232 may not coincide with the center portion of the light source 220 corresponding to the first pattern 232. In other words,

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

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

Referring to FIG. 18, the first pattern 232 may be formed at a more inclined position in the direction in which light is emitted than in the case shown in FIG.

That is, the distance between the center of the first pattern 232 and the center of the light source 220 corresponding to the center of the first pattern 232 may increase more than the case shown in FIG. 17, for example, The left end portion of the pattern 232 may overlap.

Referring to FIG. 19, the first pattern 232 may be formed at a more inclined position in the direction in which light is emitted than in the case shown in FIG. That is, the region where the first pattern 232 is formed and the region where the light source 220 corresponding to the first pattern 232 are formed may not overlap with each other, Or may be spaced apart from the surface by a predetermined distance.

Also, as shown in FIG. 20, the first pattern 232 may be formed inside the second layer 230. In this case, the central portion of the first pattern 232 may be formed at a position slightly offset from the central portion of the light source 220 corresponding to the center portion of the first pattern 232 as shown in FIG. 17 to FIG.

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

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

Referring to FIG. 22, a plurality of first patterns 232 may be formed on one surface of the diffusion plate 245. In this case, the first pattern 232 is coated on one surface of the diffusion plate 245, and the diffusion plate 245 is formed on the second layer 230 (230) so that the first pattern 232 contacts the second layer 230 ). ≪ / RTI >

Referring to FIG. 23, a plurality of first patterns 232 may be formed on one side of the transparent film 260 on the second layer 230. The transparent film 260 on which the first patterns 232 are formed may be laminated on the second layer 230.

A first air layer 238a may be formed between the transparent film 260 and the second layer 230. [ That is, the first air layer 238a may be formed between the second layer 230 and the transparent film 260. [

The first air layer 238a may have a substantially refractive index of 1 and may be different from the refractive index of the second layer 230 and the refractive index of the transparent film 260. [ Thus, the formation of the first air layer 238a may result in the formation of another layer with a different refractive index, i.e., the first air layer 238a, between the second layer 230 and the transparent film 260 So that the light emitted from the light source 220 can be more effectively diffused.

Further, an adhesive layer 239 may be further formed between the second layer 230 and the transparent film 260. The adhesive layer 239 serves to adhere the transparent film 260 and the second layer 230 while maintaining a gap between the transparent film 260 and the second layer 230 so that the first air layer 238a ) Can be easily formed.

The diffusion plate 245 may be positioned on the transparent film 260. Since the diffusion plate 245 has a hard plate shape, it can serve as a support for other functional layers and can diffuse the light incident from the light source 220.

Although not shown, the diffuser plate 245 may include a plurality of beads, and scattering the incident light using the beads may prevent light from concentrating on a specific portion.

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

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

24 to 27 are views showing the arrangement of the first patterns formed on the backlight unit according to the 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. 24, the first pattern 232 may be formed to have a circular or elliptical shape around a position where the corresponding light source 220 is formed. The central portion of the first pattern 232 may be formed at a position that does not coincide with the central portion of the light source 220 corresponding thereto. Meanwhile, each of the first patterns 232 may have a different shape or size.

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

26, the first pattern 232 may be further moved in a direction in which light is emitted than in the case shown in FIG. 25, so that only a part of the region where the light source 220 is formed is located in the first The pattern 232 may be overlapped with the region where the pattern 232 is formed.

Referring to FIG. 27, the first pattern 232 may be further moved in a direction in which light is emitted than in the case shown in FIG. 26, and may be located outside the region where the light source 220 is formed, And the region where the first pattern 232 is formed may not overlap with each other.

28 to 31 are views showing the shape of the first pattern according to the embodiment of the present invention.

Referring to FIGS. 28 to 31, embodiments of the first pattern 232 are illustrated. The first pattern 232 may include a plurality of dots or regions, The dot or area may comprise a reflective material, for example a metal or a metal oxide.

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

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

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

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

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

That is, the center portion 234 of the first pattern 232 may be formed at a position slightly offset from the central portion of the light source 220 in one direction, for example, a direction in which light is emitted from the light source 220.

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

Referring to FIGS. 30 and 31, the first pattern 232 may have a quadrangular shape centered on a region where the light source 220 is formed. The reflectance decreases as the distance from the center to the outer edge increases, and the transmittance or the aperture ratio increases can do. The features of the first pattern 232, as shown in FIGS. 28 and 29, are equally applicable to the first pattern 232 shown in FIGS. 30 and 31.

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

In addition, the distance between adjacent dots 233 may be increased from the center to the outer periphery of the plurality of dots 233 constituting the first pattern 232.

28 to 31, the first pattern 232 includes a plurality of dots. However, the present invention is not limited to this, and the reflectance decreases as the distance from the center to the periphery increases , Transmittance, or aperture ratio of the substrate.

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

32 and 33 are views showing a backlight unit according to the third embodiment of the present invention. In the following description, the same constituent elements as those of the first and second embodiments are denoted by the same reference numerals, and a description thereof will be omitted.

Referring to FIG. 32, the first pattern 232 may have a convex shape toward the light source 220, for example, the first pattern 232 may have a shape similar to a hemisphere. The cross-sectional shape of the first pattern 232 may have a semicircular or oval shape convex toward the light source 220.

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

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

The cross-sectional shape of the first pattern 232 may have various shapes convex in the direction of the light source 220, in addition to a shape similar to a semicircle.

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

34 and 35 are views showing a backlight unit according to a fourth embodiment of the present invention. In the following description, the same reference numerals are given to the same constituent elements as in the first to third embodiments described above, and the description thereof will be omitted.

Referring to FIG. 34, light emitted from the light source 220 may be diffused by the second layer 230 and emitted upward. Also, the second layer 230 may include a plurality of scattering particles 231 to scatter or refract light emitted upward, thereby making the brightness of light emitted toward the upper side more uniform.

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

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

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

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

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

34, another pattern layer, that is, a plurality of second patterns 265, may be formed on the third layer 235. In this case,

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

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

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

Referring to FIG. 35, the thickness h1 of the second layer 230 may be smaller than the height h3 of the light source 220. Referring to FIG. Accordingly, the second layer 230 surrounds a lower portion of the light source 220, and the third layer 235 surrounds an upper portion of the light source 220.

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

36 to 45 are views showing a backlight unit according to a fifth embodiment of the present invention. In the following description, the same reference numerals are given to the same components as those in the first to fourth embodiments, and the description thereof will be omitted.

36, the second layer 230 disposed on the first layer 210 on which the plurality of light sources 220 are disposed includes a depression 237 recessed in the direction toward the first layer 210 . Here, the depression 237 may be disposed between two adjacent light sources 220. That is, the second layer 230 between the two light sources 220 can be recessed. In other words, both ends of the depression 237 may be spaced apart from the adjacent light sources 220 by a predetermined distance.

When the depression 237 is formed in the second layer 230, the contact area between the second layer 230 and another layer such as an optical sheet (not shown) may be increased to improve the adhesion. Thus, it is possible to improve the structural stability of the backlight unit.

Further, by forming the depression 237 in the second layer 230, the contact area between the second layer 230 and the other layer can be increased, so that even if a relatively small amount of adhesive material is used, The adhesive force of the other layer can be sufficiently strong, and accordingly, the thickness of the backlight unit can be reduced.

On the other hand, in order to reduce the total thickness of the backlight unit, it may be preferable to make the thickness of the second layer 230 sufficiently thin. On the other hand, the second layer 230 may be formed on the light source 220 in order to protect the light source 220 by an external impact.

In order to protect the light source 220 while reducing the total thickness of the backlight unit, the second layer 230 is formed on the light source 220 and the second layer 230 is formed on the light source 220, 230 may be made thinner. The minimum thickness t3 of the second layer 230 at the depression 237 may be greater than the thickness t4 of the second layer 230 at the position corresponding to the light source 220. [

On the other hand, when the light source 220 is a side view type, if the depression 237 is formed in the second layer 230, optical characteristics can be improved.

37, when the depression 237 is formed in the second layer 230, the light diverging from the first layer 210 at an angle may reach the depression 237 . Here, the light reaching the depressed portion 237 can be reflected by the depressed portion 237. Here, the light reflected by the oblique depression 237 may be incident on the reflective layer 240 at a relatively large angle, and may be reflected by the reflective layer 240 again. The light reflected by the reflective layer 240 may reach the surface of the second layer 230 at a relatively large angle and may pass through the second layer 230. If the depression 237 is formed in the second layer 230, light loss can be reduced and the light efficiency can be improved. That is, it is possible to improve the optical characteristics.

The minimum thickness of the depression 237 formed in the second layer 230 can be variously adjusted. 38, the minimum thickness t3 of the second layer 230 in the depression 237, that is, the minimum thickness t3 of the depression 237, May be larger than the height (h4) of the light guide plate (220) by? H4.

In this case, the step of forming the depressed portion 237 can be easily performed. That is, in the manufacturing process, it may be preferable that the minimum thickness t3 of the depression 237 is larger than the height h1 of the light source 220 measured from the reflection layer 240. [

39, the minimum thickness t3 of the second layer 230 in the depression 237 is set to be smaller than the height h4 of the light source 220 measured from the reflection layer 240 by? H5 Can be small.

In this case, the light emitted from the side surface of the side-view type light source 220 can be reflected by the depression 237 toward the reflection layer 240, thereby improving the optical characteristics.

40, the minimum thickness t3 of the second layer 230 in the depression 237 is smaller than the height h4 of the light source 220 measured from the reflection layer 240, The minimum thickness t3 of the second layer 230 at the depression 237 may be smaller than the thickness t4 of the second layer 230 at the position corresponding to the light source 220. [ In this case, light reflection by the depressed portion 237 is further increased, so that the optical characteristics can be further improved.

Alternatively, as shown in FIG. 41, a part of the depression 237 may overlap with the light source 220. For example, both ends P1 and P2 of the depression 237 may be located above the adjacent light sources 220. [ Even in this case, it is possible to further improve the optical characteristics.

A manufacturing method of the depression 237 will be described below.

Referring to FIG. 42, the light source 220 may be mounted on the first layer 210 and then the reflective layer 240 may be formed on the first layer 210, as shown in FIG. 42 (a).

42 (b), a resin material in a liquid state or a gel state is coated on the first layer 210 on which the light source 220 and the reflective layer 240 are disposed to form a resin material layer 230a, Can be formed. Alternatively, a method of laminating the resin material layer 230a in the form of a sheet to the first layer 210 may be possible.

Thereafter, the resin material layer 230a can be dried. Alternatively, the resin material layer 230a may be dried by applying weak heat to the resin material layer 230a. Then, the resin material layer 230a is contracted as shown in FIG. 42 (c), and the depression 237 can be formed.

As described above, in the method of forming the depressed portion 237 by the drying method, it may be preferable to appropriately adjust the viscosity of the resin material layer 230a. For example, if the viscosity of the resin material layer 230a is excessively low, the depth of the depression 237 may be excessively low or even the depression 237 may not be formed. Alternatively, when the viscosity of the resin material layer 230a is excessively high, the resin material layer 230a may flow down, so that the thickness of the second layer 230 formed later may become excessively small.

Figs. 43 to 45 are views for explaining the case of including the above-described transparent film and the first pattern. Fig.

Referring to FIG. 43, a transparent film 260 may be disposed on the second layer 230 on which the depression 237 is formed. The transparent film 260 may have a plurality of first patterns 232 formed on one side of the transparent film 260 through coating or printing. The transparent film 260 on which the first patterns 232 are formed may be laminated on the second layer 230.

A second air layer (air layer) 238b may be formed between the transparent film 260 and the second layer 230. A second air layer 238b is formed at a position corresponding to the depression 237 between the second layer 230 and the transparent film 260. The second air layer 238b is formed at a position corresponding to the depression 237 between the second layer 230 and the transparent film 260, Can be formed.

The second air layer 238b may have a substantially refractive index of 1 and may be different from the refractive index of the second layer 230 and the refractive index of the transparent film 260. [ Accordingly, the formation of the second air layer 238b may result in the formation of another layer having a different refractive index, i.e., the second air layer 238b, between the second layer 230 and the transparent film 260 So that the light emitted from the light source 220 can be more effectively diffused.

44, an adhesive layer 239 may be further formed between the second layer 230 and the transparent film 260. The adhesive layer 239 serves to bond the transparent film 260 and the second layer 230 and at the same time maintains a gap between the transparent film 260 and the second layer 230 so that the air layer 238a And can be easily formed.

Alternatively, as shown in FIG. 45, the diffusion plate 245 may be positioned on the transparent film 260. Since the diffusion plate 245 has a hard plate shape, it can serve as a support for other functional layers and can diffuse the light incident from the light source 220.

Although not shown, the diffuser plate 245 may include a plurality of beads, and scattering the incident light using the beads may prevent light from concentrating on a specific portion.

46 is a view for explaining the positional relationship between the light source and the reflective layer provided in the backlight unit of the present invention.

Referring to FIG. 46, as the reflective layer 240 is disposed on the side surface of the light source 220, a part of the light emitted to the side surface from the light source 220 may be incident on the reflective layer 240 and may be lost.

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

The light source 220 includes a light emitting surface 332 through which light is emitted and the light emitting surface 332 may be positioned at a predetermined height c from the surface of the first layer 210.

The thickness c of the reflective layer 240 may be equal to or less than the height g of the light emitting surface 332 so that the light source 220 may be positioned above the reflective layer 240.

Therefore, the thickness c of the reflective layer 240 may be 0.02 mm to 0.08 nm or less. Here, if the thickness c of the reflective layer 240 is 0.02 mm or more, the reflective layer 240 can achieve a light reflectance in a range of reliability, and if the thickness c of the reflective layer 240 is 0.08 mm or less, The light emitted from the light source 220 can be prevented from being lost because the light emitting surface 332 of the light source 220 is covered.

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

47 to 51 are views showing the structure of a light source provided in the backlight unit of the present invention. Figs. 47 and 50 show the structure of the light source seen from the side, and Fig. 49 shows the structure of the head of the light source viewed from the front.

Referring to Figure 47, the light source 220 includes a plurality of lead frames 321 and 322, and is connected to a mold part 324 having a cavity 323, the lead frames 321 and 322, A light emitting device 325 mounted on the cavity 323 and an encapsulant 326 filled in the cavity 323 on which the light emitting device 325 is mounted.

The light emitting device 325 may be a light emitting diode chip, and the light emitting diode chip may be a blue LED chip or an ultraviolet LED chip, or may be a red LED chip, a green LED chip, a blue LED chip, green LED chips, and white LED chips.

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

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

Referring to FIG. 48, the substrate 340 may be positioned in the light emitting device a having a horizontal structure. Substrate 340 may be a single crystal substrate made of sapphire, spinel, carbide gyuseo, 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, and the n-type semiconductor layer 341 may be formed of, for example, n-GaN. The active layer 342 may be located on the n-type semiconductor layer 341, and the active layer 342 may be formed of, for example, InGaN. The p-type semiconductor layer 343 may be located on the active layer 342, and the p-type semiconductor layer 343 may be formed of, for example, p-GaN.

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

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

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

Referring again to FIG. 47, the light emitting device 325 is packaged in a mold part 324 constituting the body of the light source 220, and a cavity 323 may be formed on one side of the central part of the mold part 324 have. On the other hand, the mold part 324 can be injection-molded into a press (Cu / Ni / Ag substrate) with a resin material such as PPA (high strength plastic), and the cavity 323 of the mold part 324 functions as a reflection cup Can be performed. The shape and structure of the mold part 324 can be changed, but are not limited thereto.

The plurality of lead frames 321 and 322 penetrate in the major axis direction of the mold portion 324 and each end 327 and 328 can be exposed to the outside. Here, the mold part 324 is referred to as a long axis of symmetry axis in the longer direction when seen from the bottom surface of the cavity 323 where the light emitting device 325 is disposed, and a short axis of symmetry axis in the shorter direction.

Semiconductor devices such as a light receiving element and a protective element can be selectively mounted on the lead frames 321 and 322 together with the light emitting element 325 in the cavity 323. That is, on the lead frames 321 and 322, not only the light emitting element 325 but also a protective element such as a zener diode for electrostatic discharge (ESD) from the light emitting element 325 may be mounted together.

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

In addition, the encapsulant 326 may be filled into the mounting area after the light emitting device 325 is connected to the inside of the cavity 323. A phosphor 335 covers the light emitting element 325 between the light emitting element 325 and the sealing material 326.

The encapsulant 326 may be made of liquid resin, and may be made of transparent silicone or epoxy material. The phosphor 335 is related to the color of light emitted from the light emitting element 325. For example, when the light emitting element 325 emits blue light, the phosphor 335 may be yellow.

The phosphor 335 may be formed in a lower portion including the light emitting element 325 and may be formed in a shape in which the encapsulant 326 covers the upper portion. Particularly, the phosphor 335 has a specific gravity higher than that of the encapsulant 326, so that it can sink to the lower portion of the encapsulant 326, and the encapsulant 326 can be covered thereon.

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

49, the head part 331, which is a part of the light source 220 in which light is emitted, includes a light emitting surface 332 from which light is actually emitted and a non-light emitting surface 333 from which light is not emitted, . ≪ / RTI >

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

The light emitting surface 332 of the head portion 331 of the light source 220 may have a longer horizontal length than a vertical length. However, the shape of the light emitting surface 332 of the head portion 331 is not limited thereto. For example, the light emitting surface 332 of the light source 220 may have a rectangular shape.

The non-light emitting surface 333, which does not emit light, may be positioned above, below, left, or right of the light emitting surface 332 among the head portions 331 of the light source 220.

One ends 327 and 328 of the lead frames 321 and 322 extend to the outer side of the molding portion 324 and are firstly formed and then subjected to secondary molding with one side groove of the molding portion 324, 1 and the second lead electrodes 329 and 330, respectively. Here, the number of forming times may be changed, but is not limited thereto.

The first and second lead electrodes 329 and 330 of the lead frames 321 and 322 can be formed in a shape accommodated in the grooves formed on both sides of the bottom surface of the molding part 324. In addition, the first and second lead electrodes 329 and 330 may have a plate shape of a predetermined shape, and may be formed in a shape that facilitates solder bonding at the time of surface mounting.

50, the encapsulant 326 and the fluorescent material 335 filled in the cavity 323 are composed of the fluorescent material layer F1 consisting only of the fluorescent material 335, the fluorescent material 335 and the encapsulating material 326 And an encapsulation material layer F3 consisting only of the mixed mixed layer F2 and the encapsulation material 326 may be sequentially stacked.

The phosphor 335 may be formed on the lower portion including the light emitting element 325 to form the phosphor layer F1 and a part of the phosphor 335 may be mixed with the encapsulant 326 The mixed layer F2 may be formed. An encapsulant layer F3 made of only the encapsulant 326 may be formed at the top.

In the present invention, any shape of the encapsulant 326 and the fluorescent material 335 shown in FIGS. 47 and 50 can be applied. Since the fluorescent material 335 is formed so as to cover and surround the light emitting device 325, Light can be realized.

Referring to FIG. 51, the structure of the light source 220 may be divided into a lead type, an SMD type, and a flip chip type depending on the packaging form of the LED chip. The structure of the light source 220 of the present invention is not limited to the above-described FIGS. 47 and 50, but may also be a lead type, an SMD type or a flip chip type structure shown in FIG.

The light source 220 of the present invention configured as described above may be disposed on the backlight unit 200.

52 to 55 are views showing a backlight unit and a light source of the present invention.

Referring to FIG. 52, the light source 220 is disposed on the first layer 210, and the reflective layer 230 is disposed on the first layer 210 except for a region where the light source 220 is formed. The second layer 230 surrounding the first layer 210, the light source 220, and the reflective layer 230 may be positioned.

The first air layer 238a may be positioned between the light source 220 and the second layer 230 of the present invention. The first air layer 238a is an area spaced apart from the second layer 230 and the light source 220. The first air layer 238a is a region where the light emitted from the light source 220 is diffracted at the interface of the first air layer 238a Mixed and diffused regions.

53, the light source 220 formed on the first layer 210 is connected to the mold part 324 and the lead frame 322 in which the cavity 323 is formed, and the light source 220 connected to the cavity 323 The light emitting device 325 and the encapsulant 326 filled in the cavity 323 in which the light emitting device 325 is mounted.

Here, the phosphor 335 may cover the entire surface of the light emitting element 325 to convert light emitted from the light emitting element 325 into another color. The light source 220 may include a light emitting surface 332. The light emitting surface 332 may be a surface on which light is emitted and a surface where the sealing material 326 and the first air layer 238a are in contact with each other.

The light emitting element 325 may be positioned in contact with the fluorescent material 335 and the fluorescent material 335 may be positioned in contact with the encapsulant 326 covering the fluorescent material 335 depending on the direction in which the light is emitted from the light emitting element 325 . The sealing material 326 is disposed in contact with the first air layer 238a located between the light source 220 and the second layer 230 and the first air layer 238a is in contact with the second layer 230 Can be located. Accordingly, the light emitted from the light emitting device 325 may be sequentially emitted from the phosphor 335, the sealing material 326, the first air layer 238a, and the second layer 230 in this order.

In the backlight unit of the present invention thus constituted, the light emitted from the light emitting device 325 may be color-converted by the phosphor 335 and emit white light to the second layer 230. For example, when blue light is emitted from the light emitting device 325, blue light is converted by the yellow phosphor 335 to realize white light.

Here, the light emitted from the light emitting element 325 is not converted into white light in the phosphor 335 at all. That is, a part of the light is converted into white light by the phosphor 335, and a part of the blue light is directly emitted to the encapsulant. At this time, in the encapsulant 326, the white light converted from the fluorescent material 335 and the blue light not converted from the fluorescent material 335 are mixed to emit white light to the second layer 230.

In the present invention, the first air layer 238a is formed between the light source 220 and the second layer 230 so that the mixture of the white light and the blue light occurs in the first air layer 238a as well as in the sealing material 326 .

 54, light emitted from the light emitting element 325 located in the light source 220 in parallel with the first layer 210 is emitted from the phosphor 335, the sealing material 326, the first air The layer 238a and the second layer 230 in this order. At this time, the refractive index of the sealing material 326 may be about 1.4 to 1.6, and the refractive index of the first air layer 238a may be 1.

The first light is incident perpendicularly to the light emitting surface 332 where the sealing material 326 contacts the first air layer 238a and therefore the difference in refractive index between the sealing material 326 and the first air layer 238a Layer 210 as shown in FIG.

The second light emitted from the light emitting element 325 at a certain angle with the first layer 210 is emitted from the phosphor 335, the sealant 326, the first air layer 238a, And the second layer 230 in this order.

The second light is incident on the light emitting surface 332 contacting the sealant 326 and the first air layer 238a at an angle with respect to the light emitting surface 332 in the direction of the first layer 210 As shown in FIG.

The third light emitted from the light emitting element 325 at a certain angle with the first layer 210 is reflected by the side surface of the mold part 324 through the fluorescent material 335 and the sealing material 326, To the layer 238a and the second layer 230, respectively.

3 light is incident on the light emitting surface 332 in contact with the sealing material 326 and the first air layer 238a at an angle opposite to the light of the second light, It can be refracted and proceeded.

Here, the blue light emitted from the light emitting element 325 is white light converted into white light from the phosphor 335, and the blue light emitted from the light emitting element 325 is white light, The blue light of the blue color and the light of the third color of the white color intersect each other and are mixed with each other due to the difference in the refractive indexes of the first air layer 238a and the sealing material 326 in the case of the blue light not converted in the phosphor 335. [ Therefore, when a large number of lights are present, the blue light is blurred by the white light, and the blue light becomes unnoticeable to the viewer and can be recognized as white light.

Therefore, in the present invention, by forming the first air layer 238a between the light source 220 and the second layer 230, there is an advantage that the light closest to white in the backlight unit can be realized.

To this end, the light source 220 may be spaced apart from the second layer 230 at least at the light emitting surface 332.

55 showing the contact relationship between the light source 220 and the second layer 230 in more detail, the upper part of the light source 220 is in contact with the second layer 230, The first air layer 238a may be spaced apart from the second layer 230. [

The spacing t5 between the central portion of the light emitting surface 332 of the light source 220 and the second layer 230 is a distance between the upper mold portion 324 and the second layer 230 of the light source 220, Is formed to be larger than the interval t6. That is, the spacing between the light source 220 and the second layer 230 gradually increases from the upper side to the lower side. This is because the contact area with the second layer 230 is wide at the upper portion of the light source 220 but is nearly 90 degrees at the side of the light source 220 so that the contact force with the second layer 230 may be lowered Because.

The spacing t5 between the central portion of the light emitting surface 332 of the light source 220 and the second layer 230 is greater than the distance between the side surface 334 of the light source 220 and the side surface 334 other than the light emitting surface 332, 230). ≪ / RTI > Here, the light emitting surface 332 of the light source 220 may be the exposed surface of the sealing material 326, and the sealing material 326 is concave in the direction of the light emitting element 325 as shown in FIG. 55 The gap t5 between the light emitting surface 332 and the second layer 230 is increased.

As described above, the second air layer 230 mixes and diffuses the light emitted from the light source 220 using the difference in refractive index at the interface of the first air layer 238a, thereby emitting white light of the light source 220 There is an advantage to be implemented.

56 is a diagram showing a structure of a plurality of light sources provided in the backlight unit.

Referring to FIG. 56, the first light source 220 and the second light source 225 of the plurality of light sources provided in the backlight unit 200 may emit light in different directions.

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

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

Although the embodiment of the present invention has been described with reference to FIG. 56 as an example in which a first light source 220 that emits light in the lateral direction and a second light source 225 that emits light in the upward direction are disposed adjacent to each other, The present invention is not limited to this. For example, the side view type light sources may be adjacent to each other or the top view type light sources may be disposed adjacent to each other.

The backlight unit including the light source 220 having the above-described structure may have a plurality of light sources 220 arranged regularly on the first layer 210.

57 to 60 are views showing a front surface shape of a backlight unit according to an embodiment of the present invention.

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

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

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

In another embodiment of the present invention, the first light source array A1 includes odd-numbered light source lines from the upper side among a plurality of light source lines formed by the plurality of light sources, and the second light source array A2 includes And may 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 ) And the second light source line (L2) are alternately arranged to constitute the backlight unit (200).

The light source 220 included in the first light source array A1 and the light source 221 included in the second light source array A2 may emit light in the same direction or emit light in different directions .

Referring to FIG. 58, the backlight unit 200 may include two or more light sources that emit light in different directions.

That is, the light sources 220 included in the first light source array A1 and the light sources 221 included in the second light source array A2 may emit light in different directions. For this purpose, The direction in which the light emitting surfaces of the light sources 220 included in the first light source array A2 are directed may be different from the direction in which the light emitting surfaces of the light sources 221 included in the second light source array A2 are oriented.

More specifically, 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 are formed so as to be opposite to each other 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 can emit light in mutually opposite directions have.

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

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

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

As described above, by forming the light emitting directions of the light sources adjacent to each other in the y-axis direction, for example, the first light source 220 and the second light source 221 in opposite directions to each other, It is possible to reduce the phenomenon that the brightness of light in the region is concentrated or weakened.

That is, the light emitted from the first light source 220 can be weakened as it proceeds to the adjacent light source, and accordingly, as the distance from the first light source 220 increases, the luminance of the light emitted toward the display panel 100 Can be weakened.

Therefore, by reversing the direction in which light is emitted from each of the first light source 220 and the second light source 221, it is possible to compensate for the fact that the brightness of light in the region adjacent to the light source is concentrated and the light in the region far from the light source is weakened So that the luminance of the light emitted from the backlight unit 200 can be made uniform.

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

That is, the second light sources 221 included in the second light source array A2 may be arranged to be adjacent to the first light sources 220 included in the first light source array A1 in a diagonal direction.

59, two light source lines, for example, the first light source line L1 and the second light source line L1, which are included in the first light source array A1 and the second light source array A2, (L2) may be spaced apart by a predetermined distance 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 are arranged in a y-axis direction perpendicular to the x- And may be spaced apart from each other by a predetermined distance d1.

As the distance d1 between the first and second light source lines L1 and L2 increases, there may occur an area where light emitted from the first light source 220 or the second light source 221 does not reach, So that the brightness of the light in the region can be very weakened.

Meanwhile, as the distance d1 between the first and second light source lines L1 and L2 decreases, interference between light emitted from the first light source 220 and the second light source 221 may occur In this case, the divided drive efficiency of the light sources may be reduced.

Therefore, in order to reduce the interference between the light sources and make the luminance of the light emitted from the backlight unit 200 uniform, the light source lines adjacent to the direction in which the light is emitted, for example, the first and second The distance d1 between the light source lines L1 and L2 may be 5 to 22 mm.

The third light source 222 may be disposed in the first light source line of the first light source array A1 to be adjacent to the first light source 220 in a direction in which the light is emitted, And the third light source 222 may be spaced apart by a predetermined distance d2.

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

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

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

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

The distance d1 between the first light source 220 and the second light source 221 adjacent to each other in the direction intersecting with the direction in which the light is emitted is the distance between two adjacent light sources in the direction in which the light is emitted, May be smaller than the distance d2 between the light source 220 and the third light source 222, so that the brightness of light emitted from the backlight unit 200 can be uniform.

In consideration of the interval d1 between the adjacent light source lines having the above-described range, in order to reduce the interference between the light sources and to uniform the brightness of the light emitted from the backlight unit 200, The distance d2 between the first light source 220 and the third light source 222 adjacent to each other in the direction in which the light is emitted may be 9 to 27 mm.

The second light source 221 included in the second light source array A2 is disposed so as to correspond to the position between the adjacent first and second light sources 220 and 222 included in the first light source array A1 .

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 through the first light source 220 and the third light source 222 l1). < / RTI >

In this case, the distance d3 between the straight line l1 and the first light source 220 where the second light source 221 is disposed is shorter than the distance d4 between the straight line l1 and the third light source 222 It can be big.

The light emitted from the second light source 221 travels in a direction opposite to the light emitting direction of the third light source 222 and accordingly the light emitted toward the display panel 100 in the region adjacent to the third light source 222 The luminance may be weakened.

Thus, by disposing the second light source 221 adjacent to the third light source 222 rather than the first light source 220 as described above, the brightness of the light in the region adjacent to the third light source 222 is reduced, It is possible to compensate by using the luminance of the light concentrated in the region adjacent to the light emitting portion 221.

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, in a slightly oblique direction to the x-axis direction.

For example, referring to FIG. 60, the direction in which the light emitting surfaces of the light sources 220 and 221 face may be formed obliquely upward or downward by a certain angle with reference to the x-axis direction.

61 and 62 are views showing a backlight unit according to a sixth embodiment of the present invention. In the following description, the same reference numerals are given to the same constituent elements as in the first to fifth embodiments, and the description thereof will be omitted.

61, a backlight unit according to an exemplary embodiment of the present invention includes a plurality of diffusion patterns 240 for facilitating propagation of light emitted from a light source 220 to an adjacent light source 222, (241) may be formed. The plurality of diffusion patterns 241 may diffuse or refract light emitted from the light source 220.

More specifically, referring to FIG. 62, the backlight unit 200 may include two or more light sources that emit light in different directions.

The backlight unit 200 may include a first light source 220 and a third light source 222 that emit light laterally in a direction parallel to the x axis, The light sources 222 may be disposed adjacent to each other in the x-axis direction in which light is emitted.

The first light source 220 and the third light source 222 are arranged in a direction perpendicular to the x axis direction and emit light in a direction opposite to the first light source 220 and the third light source 222 The second light source 221 and the fifth light source 224 may be disposed. That is, the rows in which the first light source 220 and the third light source 222 are arranged and the rows in which the second light source 221 and the fifth light source 224 are arranged may be arranged in an intersecting manner.

Therefore, by forming the light emitting directions of the first light source 220 and the third light source 222 and the light emitting directions of the second light source 221 and the fifth light source 224 in opposite directions to each other, It is possible to reduce the phenomenon in which the luminance of light is concentrated or attenuated.

In this case, the light emitted from the first light source 220 may be weakened as it proceeds to the third light source 222, and accordingly, as it is farther away from the first light source 220, The brightness of the light can be weakened.

Accordingly, in the sixth embodiment of the present invention, a plurality of diffusion patterns 241 may be disposed between the first light source 220 and the third light source 222. [ The plurality of diffusion patterns 241 may diffuse or refract light emitted from the first light source 220 to emit light of a uniform brightness from the backlight unit 200.

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

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

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

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

The plurality of diffusion patterns 241 may increase in density from the first light source 220 to the third light source 222. Accordingly, it is possible to prevent the brightness of the light emitted upward from the area remote from the first light source 220, that is, the rear area of the third light source 222, to be reduced, The brightness can be kept uniform.

For example, the plurality of diffusion patterns 241 made of dots may increase the interval between two adjacent diffusion patterns from the light emitting surface of the first light source 220 toward the third light source 222, The light emitted from one light source 220 is diffused or refracted toward the third light source 222, so that the brightness can be maintained uniformly.

In particular, the plurality of diffusion patterns 241 may not exist in a region adjacent to the first light source 220. Accordingly, the light emitted from the first light source 220 is totally reflected by the lower reflective layer 240 in the region where the diffusion patterns 241 are not present, The luminance of the entire region including the region adjacent to the third light source 222 can be uniformly maintained.

A plurality of diffusion patterns 241 may be disposed between the second light source 221 and the fifth light source 224 which emit light in a direction opposite to the first light source 220 and the third light source 222 have.

The density of the plurality of diffusion patterns 241 may be increased from the light emitting surface of the second light source 221 to the fifth light source 224, as described above. The distance between two adjacent diffusion patterns 241 of the plurality of diffusion patterns 241 disposed between the second light source 221 and the fifth light source 224 is set to be a distance from the light emitting surface of the second light source 221 5 light source 224 in the same manner.

The second light source 221 is located on the diagonal line in the direction of the light emitting surface of the first light source 220, and a plurality of diffusion patterns 241 may be arranged in a line on the diagonal line. Since the directions of the light emitted from the first light source 220 and the light emitted from the second light source 221 are opposite to each other, the light from the first light source 220 and the light from the second light source 221 The brightness can be increased in the superimposed superimposed area. Accordingly, a plurality of diffusion patterns 241 are located on the diagonal lines of the first light source 220 and the second light source 221, thereby preventing an increase in brightness in the overlap region of light.

62, the planar shape formed by the plurality of diffusion patterns 241 disposed between the first light source 220 and the third light source 222 is a planar shape formed by the second light source 221 and the fifth light source 222. Therefore, And the plurality of diffusion patterns 241 disposed between the diffusion patterns 224 may be symmetrical with each other.

For example, the planar shape formed by the plurality of diffusion patterns 241 disposed between the first light source 220 and the third light source 222 or between the second light source 221 and the fifth light source 224 is a planar shape Shape.

Such a fan shape is disposed so as to correspond to the directional angle of light emitted from the light source, so that the light emitted from the light source is efficiently transmitted and diffused, so that the overall luminance of the backlight unit can be uniformly maintained.

63 to 73 are views showing a backlight unit according to a seventh embodiment of the present invention.

2 to 62, the backlight unit of the present invention includes a first layer 210, a plurality of light sources 220 disposed on the first layer 210, a plurality of light sources (not shown) A second layer 230 surrounding the first layer 210 and a reflective layer 240 disposed between the first layer 210 and the second layer 230.

63 and 64, a backlight unit 200 according to a seventh embodiment of the present invention includes a plurality of light sources 220 for emitting light on a plurality of first layers 210, At least one reflective layer 240 and a plurality of first layers 210 located on a plurality of first layers 210 except for a plurality of light sources 220, 240) and a second layer (230) surrounding at least a portion of the plurality of light sources (220). The first air layer 238a may be positioned between the light source 220 and the second layer 230. [

More specifically, the first layers 210 may be divided into a plurality of pieces and arranged in parallel on the same plane in the x-axis direction. The first layers 210, which are divided into a plurality of portions, may be in contact with each other to form a single disc.

The first layers 210 may include a plurality of light sources 220 that emit light and the reflective layer 240 may be disposed on the first layers 210 except for the plurality of light sources 220 .

61 and 62, a plurality of diffusion patterns are disposed in the reflective layer 240, and the light emitted from the light source 220 can be reflected to the adjacent light source or the upper portion.

The second layer 230 is disposed on the front surface of the first layer 210 on which the plurality of light sources 220 and the reflective layer 240 are formed to diffuse the light emitted from the light sources 220, I can change it.

The backlight unit 200 according to the seventh exemplary embodiment of the present invention includes a plurality of light sources 220 disposed on a plurality of first layers 210 and a second layer 230 covering the reflective layer 240 And a single backlight unit 200 may be formed.

On the other hand, unlike the above, the plurality of divided first layers 210 of the present invention may be arranged in parallel with M (M is a natural number of 1 or more) in the x-axis direction.

63, the backlight unit 200 may include four first layers 210, but FIG. 63 is only an example for describing the backlight unit according to the present invention, And may be changed according to the screen size of the display device or the like.

For example, as shown in FIG. 65, two first layers 210 may be disposed to implement the backlight unit 200, and six first layers 210, as shown in FIG. 66, And the backlight unit 200 may be implemented. In addition, as shown in FIG. 67, eight first layers 210 may be disposed to implement the backlight unit 200. In the case of a display device having a large screen, the present invention can constitute the backlight unit 200 by arranging at least ten first layers 210.

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

68 is a cross-sectional view showing a backlight unit according to Q-Q 'in FIG. 68; As shown in Figure 68 (a), a plurality of light sources 220 are formed on the first layers 210a, 210b, 210c, and 210d, respectively, through soldering. 68 (b), the first layers 210a, 210b, 210c, and 210d are bonded to each other to form the first layer 210, respectively.

68 (c), one or a plurality of reflective layers 240 are formed on the first layer 210 so as to cover the entire surface of the first layer 210. Next, as shown in FIG. 68 (d), the second layer 230 is formed on the first layer 210 on which the reflective layer 240 is formed by a method such as adhesion, coating, etc. to form the backlight unit of the present invention Can be manufactured.

The plurality of light sources 220 disposed on the first layers 210 and the first layers 210 may be fabricated independently of each other and may be disposed close to each other to form a modular backlight unit . Such a modular backlight unit can provide light to the display panel as backlight means.

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

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

For example, only a portion of the light sources 220 in one first layer 210 may be independently driven to emit light upwardly, and the light sources 220 included in the first layers 210 220 can be independently controlled.

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 dividedly driven It is possible.

As described above, by constructing the backlight unit 200 by assembling the plurality of first layers 210, it is possible to simplify the manufacturing process of the backlight unit 200 and reduce the loss that may occur in the manufacturing process The productivity can be improved. In addition, the backlight unit 200 can be applied to various sizes of backlight units by mass-producing the first layers 210 by standardizing them.

Meanwhile, if any one of the plurality of first layers 210 provided in the backlight unit 200 is defective, it is not necessary to replace the entire backlight unit 200, and only the defective optical assembly can be replaced, And the cost of replacing parts can be reduced.

69 and 70, the backlight unit 200 of the present invention may include a transparent film 260 on which a first pattern 232 is formed on a second layer 230. The first pattern 232 is as described above, and it is possible to prevent the hot spot phenomenon generated from the light source 220. Then, the diffusion plate 245 may be disposed apart from the transparent film 260.

71 and 72, the backlight unit 200 of the present invention may further include an adhesive layer 239 on the transparent film 260 on which the first patterns 232 are formed. The adhesive layer 239 is as described above and the transparent film 260 and the second layer 230 are bonded to each other and a first air layer 238a is formed between the transparent film 260 and the second layer 230 Can play a role.

The adhesive layer 239 may be applied in a line form between the light sources 220 and may be applied in the form of dots between the light sources 220 as shown in FIG.

74 is a cross-sectional view illustrating the configuration of a display device according to an eighth embodiment of the present invention. Description of the same components as those described with reference to Figs. 1 to 73 of the display device shown in Fig. 74 will be omitted .

74, a display panel 110 including a first substrate 111, a second substrate 112, an upper polarizer plate 160a and a lower polarizer plate 160b, a first layer 210, The backlight unit 200 including the light sources 220 and the second layer 230 may be formed 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 and fixed to the lower surface of the display panel 110.

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

The backlight unit 200 includes 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, for example, A second layer 230 formed on the first layer 210, a first air layer 238a formed between the light source 220 and the second layer 230, A transparent film 260 on which patterns 232 are formed, and a diffusion plate 245 formed on the transparent film 260. [ However, the present invention is not limited thereto, and all of the embodiments of Figs. 2 to 73 described above are applicable.

The bottom plate 135 may be disposed under the backlight unit 200 and the bottom plate 135 may be formed in close contact with the bottom surface of the first layer 210.

Meanwhile, the display device may include a driving module for supplying driving signals and power to the display module, more specifically, the display panel 110 and the backlight unit 200. For example, The plurality of light sources 220 may be driven by using a voltage supplied from the driving unit 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 includes a driving unit chassis 145 ) And can be fixed.

According to an embodiment of the present invention, a first connector 310 may be formed on the rear surface of the first layer 210. For this purpose, a hole for inserting the first connector 310 is formed in the bottom plate 135, (350) may be formed.

The first connector 310 electrically connects the light source 220 and the power supply unit 143 so that the 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, And may transmit the driving voltage supplied from the supply unit 143 to the light source 220.

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

The display device may include a driving control unit 141 for controlling the driving of the display panel 100 and the backlight unit 200. For example, the driving control unit 141 may include a timing controller .

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

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

The drive control unit 141 may be fixed on the drive unit chassis 145 disposed on the bottom plate 135 to stably support and fix the drive control unit 141 as shown in FIG.

According to the embodiment of the present invention, the second connector 320 may be formed on the substrate 210. For this purpose, a hole 350 for inserting the second connector 320 is formed in the bottom plate 135 .

The second connector 320 may electrically connect the first layer 210 and the drive control unit 141 so that a control signal output from the drive control unit 141 may be supplied 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 drive control unit 141 using the second cable 420, and is driven through the second cable 420 And may transmit the control signal supplied from the control unit 141 to the first layer 210. [

A light source driver (not shown) may be formed on the first layer 210. The light source driver (not shown) may be connected to the first layer 210 using a control signal supplied from the drive controller 141 through the second connector 320 The light sources 220 can be driven.

The power supply unit 143 and the drive control unit 141 may be enclosed in the rear case 150 to be protected from the outside.

The structure of the display device shown in FIG. 74 is merely an embodiment of the present invention, and accordingly the power supply unit 143, the drive control unit 141, the first and second connectors 310 and 320, The position or the number of the two cables 410 and 420 can be changed as needed.

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

Claims (14)

A first layer;
A plurality of light sources disposed on the first layer and emitting light in one direction;
A second layer positioned on the first layer on which the plurality of light sources are disposed; And
And an air layer located at least in part between the plurality of light sources and the second layer,
Wherein the plurality of light sources include:
A light emitting element; And
A fluorescent material and an encapsulant covering the light emitting element,
The light emitted from the light emitting device is emitted in the order of the phosphor, the sealing material, the air layer, and the second layer,
Wherein the second layer comprises:
And a depression which is located only between two adjacent light sources and is recessed in a direction toward the first layer.
The method according to claim 1,
Wherein the light emitting element is in contact with the phosphor, the phosphor is in contact with the sealing material, the sealing material is in contact with the air layer, and the air layer is in contact with the second layer.
The method according to claim 1,
Wherein the plurality of light sources include:
A mold portion including a plurality of lead frames, the mold portion being formed with a cavity;
A light emitting element connected to the lead frame and mounted on the cavity; And
And the encapsulant filled in the cavity in which the light emitting element is mounted.
The method according to claim 1,
And the phosphor covers a front surface of the light emitting element.
The method according to claim 1,
And at least one light source of the plurality of light sources is at least one side separated from the second layer.
6. The method of claim 5,
Wherein the plurality of light sources include a light emitting surface from which light is emitted,
And at least one surface of the at least one light source spaced apart from the second layer is the light emitting surface.
The method according to claim 6,
And the air layer is positioned between the light emitting surface and the second layer.
8. The method of claim 7,
Wherein the thickness of the air layer located between the light emitting surface and the second layer is thicker than the thickness of the air layer located between one side of the light source except for the light emitting surface and the second layer.
The method according to claim 1,
And at least one light source of the plurality of light sources is in contact with at least one side of the second layer.
The method according to claim 1,
Wherein the second layer is a resin plate having a plurality of grooves corresponding to the plurality of light sources.
The method according to claim 1,
Wherein the second layer is a resin film.
The method according to claim 1,
And a reflective layer between the first layer and the second layer.
delete delete

Images