KR101672419B1 - Back Light Unit and Display Apparatus - Google Patents

Abstract

The present invention relates to a backlight unit and a display device.
A backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, wherein an interval between a first light source disposed at an outermost one of the plurality of light sources and an end of the substrate is different from a distance May be less than the spacing between the second light sources.
Further, another backlight unit according to the present invention includes a substrate and a plurality of light sources arranged on the substrate, and the plurality of light sources may be arranged such that the light emitting surface faces a direction parallel to the short side of the substrate.

Description

BACKLIGHT UNIT AND DISPLAY APPARATUS Technical Field [1]

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

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent Display (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied and used. Among them, a liquid crystal panel of an LCD includes a TFT substrate and a color filter substrate which are opposed to each other with a liquid crystal layer and a liquid crystal layer interposed therebetween, and an image can be displayed using light provided from the backlight unit.

An object of the present invention is to provide a backlight unit and a display device capable of reducing the thickness while increasing the light efficiency.

A backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, wherein an interval between a first light source disposed at an outermost one of the plurality of light sources and an end of the substrate is different from a distance May be less than the spacing between the second light sources.

In addition, the light source may include a light emitting diode.

In addition, the light source may be oriented in a direction in which the light emitting surface is perpendicular to the substrate.

In addition, the light source may face the light emitting surface in a direction parallel to the substrate.

In addition, when a straight line passing through the first light source and perpendicular to an end of the substrate is referred to as a first straight line, and a straight line parallel to an end of the substrate and passing through the second light source is referred to as a second straight line, The shortest distance between the ends of the substrate may be smaller than the distance between the first straight line and the second straight line and the distance between the first light sources.

The first light source and the second light source may have a light emitting surface oriented in a direction parallel to the substrate and a direction in which the light emitting surface of the first light source faces and a direction in which the light emitting surface of the second light source faces are different from each other.

The light emitting surface of the second light source may be directed to the end of the substrate and the direction of the light emitting surface of the first light source may be opposite to the direction of the light emitting surface of the second light source.

Another backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, the substrate including a first edge and a second edge adjacent to the first edge, Wherein the plurality of light sources include a first light source adjacent to the first edge and a third light source adjacent to the second edge, the distance between the first edge and the first light source being greater than the distance between the second edge and the second edge, And may be different from the interval between the third light sources.

The distance between the first edge and the first light source is smaller than the distance between the first light source and the second light source adjacent to the first light source, May be less than the spacing between the four light sources.

The first light source and the third light source are arranged such that a light emitting surface faces a direction parallel to the first edge, and an interval between the first edge and the first light source is a distance between the second edge and the third light source .

The first edge may be a short side of the substrate, and the second edge may be a long side of the substrate.

Further, another backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, wherein the light source is disposed so as to face the direction parallel to the substrate, and the direction of the light- The first light source disposed at the outermost one of the plurality of light sources may emit light in a direction away from an end of the adjacent substrate.

Further, another backlight unit according to the present invention includes a substrate and a plurality of light sources arranged on the substrate, and the plurality of light sources may be arranged such that the light emitting surface faces a direction parallel to the short side of the substrate.

The light-emitting surface of the light source adjacent to the long side of the substrate among the plurality of light sources may be disposed so as to face away from the long side of the adjacent substrate.

A display device according to the present invention includes a display panel and a backlight unit attached to the back surface of the display panel, wherein the backlight unit includes a substrate and a plurality of light sources disposed on the substrate, The distance between the first light source disposed and the end of the substrate may be smaller than the distance between the first light source and the second light source adjacent thereto.

Another display device according to the present invention includes a display panel and a backlight unit attached to the back surface of the display panel, wherein the backlight unit includes a substrate and a plurality of light sources disposed on the substrate, Wherein the plurality of light sources includes a first light source adjacent to the first edge and a third light source adjacent to the second edge, wherein the first edge is adjacent to the first edge, The distance between the first edge and the first light source may be different from the distance between the second edge and the third light source.

Another display device according to the present invention includes a display panel and a backlight unit attached to the back surface of the display panel, wherein the backlight unit includes a substrate and a plurality of light sources disposed on the substrate, And the first light source disposed at the outermost one of the plurality of light sources may emit light in a direction away from an end of the adjacent substrate.

Another display device according to the present invention includes a display panel and a backlight unit attached to a back surface of the display panel, wherein the backlight unit includes a substrate and a plurality of light sources disposed on the substrate, And the surface may be disposed so as to face the direction parallel to the short side of the substrate.

The backlight and the display device according to the present invention improve the light efficiency and thickness by improving the arrangement method of the plurality of light sources arranged on the substrate.

1 is an exploded perspective view showing a configuration of a display device;
2 is a schematic cross-sectional view of a display device according to an embodiment of the present invention;
3 is a cross-sectional view of the backlight unit;
4 is a cross-sectional view of another configuration of the backlight unit;
FIGS. 5 to 8 are diagrams for explaining the direct-type method; FIG.
9 to 12 are views for explaining a method of arranging light sources;
13 to 18 are diagrams for explaining another example of a method of arranging light sources; And
19 to 20 are views for explaining the number of light sources arranged on the substrate.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood that the present invention is not intended to be limited to the specific embodiments but includes all changes, equivalents, and alternatives falling within the spirit and scope of the present invention.

In describing the present invention, the terms first, second, etc. may be used to describe various components, but the components may not be limited by the terms. The terms may only be used for the purpose of distinguishing one element from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The term " and / or " may include any combination of a plurality of related listed items or any of a plurality of related listed items.

When an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, but other elements may be present in between Can be understood. On the other hand, when it is mentioned that an element is "directly connected" or "directly connected" to another element, it can be understood that no other element exists in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions may include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used interchangeably to designate one or more of the features, numbers, steps, operations, elements, components, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries can be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are, unless expressly defined in the present application, interpreted in an ideal or overly formal sense .

In addition, the following embodiments are provided to explain more fully to the average person skilled in the art. The shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

FIG. 1 is an exploded perspective view of the configuration of a display device. FIG.

1, the display device 1 may include a front cover 30, a rear cover 40, and a display module 20 disposed between the front cover 30 and the back cover 40 .

The front cover 30 may be disposed to surround the display module 20 and may include a front panel (not shown) of a substantially transparent material capable of transmitting light. Here, the front panel may be disposed on the front surface of the display module 20 at regular intervals to protect the display module 20 from an external impact.

2 is a cross-sectional view of a display device according to an embodiment of the present invention.

2, the display module 20 included in the display device may include a display panel 100 and a backlight unit 200. Referring to FIG.

The display panel 100 may include a color filter substrate 110 and a TFT (Thin Film Transistor) substrate 120 so as to be opposed to each other to maintain a uniform cell gap. In addition, a liquid crystal layer (not shown) may be disposed between the color filter substrate 110 and the TFT substrate 120.

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

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

The TFT substrate 120 can switch a pixel electrode (not shown) as a switching element.

The liquid crystal layer is made up of a plurality of liquid crystal molecules, and the liquid crystal molecules can change the arrangement in accordance with a voltage difference generated between a pixel electrode and a common electrode (not shown) The light can be incident on the color filter substrate 110 in accordance with the change in molecular arrangement of the liquid crystal layer.

The upper polarizer 130 and the lower polarizer 140 may be disposed on the upper and lower sides of the display panel 100 and more specifically the upper polarizer 130 may be formed on the upper surface of the color filter substrate 110 And a lower flat plate 140 may be formed on the lower surface of the TFT substrate 120.

A gate and a data driver (not shown) may be provided on a side surface of the display panel 100 to generate a driving signal for driving the panel 100.

The structure and configuration of the display panel 100 are merely examples, and modifications, additions, and deletions of the embodiments are possible within the scope of the present invention.

2, the display device according to the embodiment of the present invention can be configured by closely attaching the backlight unit 200 to the display panel 100. For example, the backlight unit 200 may be attached to and fixed to the lower surface of the display panel 100, more specifically, to the lower polarizer 140. For this purpose, the backlight unit 200 may be fixed between the lower polarizer 140 and the backlight unit 200 An adhesive layer (not shown) may be formed.

By forming the backlight unit 200 in close contact with the display panel 100 as described above, the overall thickness of the display device can be reduced to improve the appearance, and the structure for fixing the backlight unit 200 can be removed, And the manufacturing process can be simplified. In addition, by reducing the space between the backlight unit 200 and the display panel 100, it is possible to prevent a malfunction of the display device due to the insertion of foreign substances into the space or deterioration of the image quality of the display image.

According to an exemplary embodiment of the present invention, the backlight unit 200 may include a plurality of functional layers stacked, and at least one of the plurality of functional layers may include a plurality of light sources (not shown) .

The backlight unit 200 and more specifically the plurality of layers constituting the backlight unit 200 may be disposed on the lower surface of the display panel 100 so that the backlight unit 200 is in contact with the lower surface of the display panel 100. [ It is preferable that they are made of a material having flexibility.

A bottom cover (not shown) on which the backlight unit 200 is mounted may be provided on the lower side of the backlight unit 200.

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

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

3 is a view showing a cross section of the backlight unit.

Referring to FIG. 3, the backlight unit 200 may include a substrate 210, a light source 220, a resin layer 230, and a reflective layer 240.

The plurality of light sources 220 may be formed on the substrate 210 and the resin layer 230 may be formed on the substrate 210 to surround the plurality of light sources 220.

An electrode pattern (not shown) for connecting the connector (not shown) and the light source 220 (not shown) may be formed on the substrate 210. For example, a carbon nanotube electrode pattern (not shown) for connecting the light source 220 and the connector may be formed on the upper surface of the substrate 210. The connector may be electrically connected to a power supply unit (not shown) that supplies power to the light source 220.

The substrate 210 may be a printed circuit board (PCB) including a material such as polyethylene terephthalate, glass, polycarbonate, and silicone. In addition, the substrate 210 may be a film substrate.

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

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. Also, 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 such a light emitting diode may be changed within the technical scope of the embodiment.

The resin layer 230 disposed on the upper side of the substrate 210 transmits and diffuses the light emitted from the light source 220 to uniformly transmit light emitted from the light source 220 to the display panel 100 .

A reflective layer 240 may be formed between the substrate 210 and the resin layer 230 or more specifically on the upper surface of the substrate 210 to reflect light emitted from the light source 220.

The reflective layer 240 may reflect the light totally reflected from the boundary of the resin layer 230 to diffuse the light emitted from the light source 220 more widely.

The reflective layer 240 may be formed by dispersing a white pigment such as titanium oxide in a synthetic resin sheet, a metal vapor-deposited film on a surface thereof, or a sheet made of a synthetic resin in which bubbles are dispersed in order to scatter light. , And silver (Ag) may be coated on the surface to increase the reflectance. Alternatively, the reflective layer 240 may be coated on the upper surface of the substrate 210.

The resin layer 230 may be composed of various resins having light transmittance. For example, the resin layer 230 may include any one material selected from the group consisting of polyethylene terephthalate, polycarbonate, polypropylene, polyethylene, polystyrene, and polyepoxy, silicone, acrylic, or at least two materials. Do.

The refractive index of the resin layer 230 may be about 1.4 to 1.6 so that the light emitted from the light source 220 is diffused and the backlight unit 200 has a uniform brightness.

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

The resin layer 230 may be formed by applying a liquid or gel resin to the upper surface of the substrate 210 on which the plurality of light sources 220 and the reflective layer 240 are formed and then curing the resin, And may be separately formed and bonded to the upper surface of the substrate 210.

As the thickness a of the resin layer 230 increases, the light emitted from the light source 200 spreads more widely, and light of uniform luminance from the backlight unit 200 can be provided to the display panel 100. On the other hand, as the thickness a of the second layer 230 increases, the amount of light absorbed in the second layer 230 may increase, and thus the amount of light absorbed by the backlight unit 200, which is provided to the display panel 100 The brightness of the light can be reduced as a whole.

The thickness a of the resin layer 230 is 0.1 to 4.5 mm so as to provide uniform brightness without reducing the brightness of the light provided to the display panel 100 from the backlight unit 200 desirable.

4 is a cross-sectional view of another configuration of the backlight unit. Hereinafter, the description of the parts described in detail in FIG. 3 will be omitted.

4, a plurality of light sources 220 may be mounted on a substrate 210, and a resin layer 230 may be disposed on a substrate 210. Referring to FIG. Meanwhile, a reflective layer 240 may be formed between the substrate 210 and the resin layer 230.

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

The scattering particles 231 are formed of a material having a refractive index different from that of the material constituting the resin layer 230 in order to scatter or refract light emitted from the light source 220, Or a material having a refractive index higher than that of the acrylic resin.

For example, the scattering particles 231 may be selected from the group consisting of polymethylmethacrylate / styrene copolymer (MS), polymethylmethacrylate (PMMA), polystyrene (PS), silicon, titanium dioxide (TiO2) ), And 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 of the resin layer 230. For example, the scattering particles 231 may be formed by forming bubbles in the resin layer 230 .

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 resin layer 230 may be formed by mixing scattering particles 231 with a liquid or gel resin and then irradiating the substrate 210 on which the plurality of light sources 220 and the reflective layer 240 are formed ), And then curing it.

4, an optical sheet 250 may be disposed on the upper side of the resin layer 230. For example, the optical sheet 250 may include a prism sheet 251 and a diffusion sheet 252 . In this case, the plurality of sheets included in the optical sheet 250 are provided without being spaced apart from each other and adhered or adhered to each other, so that the thickness of the optical sheet 250 or the backlight unit 200 can be minimized.

The lower surface of the optical sheet 250 is in close contact with the resin layer 230 so that the upper surface of the optical sheet 250 is in contact with the lower surface of the display panel 100 and more specifically the lower polarizer 140 .

The diffusion sheet 252 diffuses the incident light to prevent the light from the resin layer 230 from being partially concentrated, thereby uniformizing the brightness of the light. 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. [

The LED package constituting the light source 220 in the direct-down type may be divided into a top view mode and a side view mode depending on the direction in which the light emitting surface is directed. The following is a look at this.

5 to 8 are diagrams for explaining the direct-down method.

FIG. 5 shows a top view method in the direct-down method.

5, the plurality of light sources 220 provided in the backlight unit 200 are arranged such that the light-emitting surfaces thereof are disposed on the upper surface thereof and are arranged in a direction perpendicular to the substrate 210 or the reflective layer 240 Light can be emitted.

FIG. 6 shows a side view method of the direct down method.

6, each of the plurality of light sources 220 provided in the backlight unit 200 may have a light emitting surface disposed on a side surface thereof to emit light in a lateral direction, that is, in a direction parallel to the substrate 210 or the reflective layer 240. [ can do. For example, the plurality of light sources 220 may be configured using a side-view LED package, thereby reducing the problem that the light source 220 is viewed as a hot spot on the screen , The thickness (a) of the resin layer 230 can be reduced to realize the slimming of the backlight unit 200 and further the display device.

Referring to FIG. 6, the backlight unit 200 may include a plurality of resin layers 230 and 235.

The light emitted to the side from the light source 220 may travel through the first resin layer 230 to the region where the adjacent light source 225 is disposed.

Some of the light transmitted through the first resin layer 230 may be emitted toward the upper side of the display panel 100. For this, the first resin layer 230 may include a plurality of scattering particles 231 as described with reference to FIG. 4 to scatter or refract the direction of the traveling light upward.

Also, some of the light emitted from the light source 220 may be incident on the reflective layer 240, and the light incident on the reflective layer 240 may be reflected and diffused upward.

On the other hand, a large amount of light can be emitted from a region adjacent to the light source 220 due to a strong scattering phenomenon near the light source 220 or light emitted in a direction close to the image side from the light source 220, Light of brightness can be observed. As shown in FIG. 7, the first light shielding pattern 260 may be formed on the first resin layer 230 to reduce the brightness of light emitted from the light source 220. Accordingly, light of uniform luminance can be emitted from the backlight unit 200. For example, the first light-shielding pattern 260 may be formed on the first resin layer 230 to correspond to a position where the plurality of light sources 220 are disposed, and a part of the light incident from the light source 220 may be It is possible to reduce the brightness of the light emitted upward by blocking the remaining part.

The first light-shielding pattern 260 may be made of titanium dioxide (TiO 2). In this case, a part of the light incident from the light source 220 may be reflected downward and partially transmitted.

According to an embodiment of the present invention, a second resin layer 235 may be disposed on the first resin layer 230. The second resin layer 235 may be formed of the same or different material as the first resin layer 230 and may be formed by diffusing light emitted upward from the first resin layer 230, The uniformity of light luminance can be improved.

The second resin layer 235 may be made of a material having the same refractive index as the material of the first resin layer 230, or may be made of a material having a different refractive index.

For example, when the second resin layer 235 is composed of a material having a refractive index higher than that of the first resin layer 230, the light emitted from the first resin layer 230 can be diffused more widely.

On the contrary, when the second resin layer 235 is made of a material having a refractive index lower than that of the first resin layer 230, light emitted from the first resin layer 230 is reflected by the lower surface of the second resin layer 235 The light emitted from the light source 220 can be more easily propagated along the first resin layer 230.

The first resin layer 230 and the second resin layer 235 may each include a plurality of scattering particles. In this case, the density of the scattering particles included in the second resin layer 235 may be different from that of the first resin layer 235. [ May be higher than the density of the scattering particles contained in the scattering particles 230. When scattering particles are included in the second resin layer 235 with a higher density, the light emitted upward from the first resin layer 230 can be diffused more widely, and the light emitted from the backlight unit 200, It is possible to make the luminance of the light emitted from the light source more uniform.

The second light shielding pattern 265 is formed on the second resin layer 235 and the light emitted from the second resin layer 235 can be uniformed as shown in FIG. For example, when light emitted upward from the second resin layer 235 is concentrated on a specific portion and observed at a high luminance on the screen, a portion of the upper surface of the second resin layer 235 corresponding to the specific portion The second light-shielding pattern 265 can be formed on the backlight unit 200, thereby reducing the brightness of the light in the specific portion, thereby making the brightness of the light emitted from the backlight unit 200 uniform.

The second light-shielding pattern 265 may be made of titanium dioxide (TiO2). In this case, part of the light emitted from the second resin layer 235 may be reflected downward in the second light-shielding pattern 265, .

8, a pattern may be formed on the reflective layer 240 to facilitate the light emitted from the light source 220 to travel to the adjacent light source 225.

The pattern formed on the upper surface of the reflective layer 240 may include a plurality of protrusions 241. The light incident on the plurality of protrusions 241 after being emitted from the light source 220 may be scattered in the traveling direction It can be refracted.

8, the density of the protrusions 241 formed on the reflection layer 240 may increase as the distance from the light source 220, that is, toward the adjacent light source 225 is increased. Accordingly, it is possible to prevent the brightness of the light emitted upward from the region remote from the light source 220, that is, the region near the adjacent light source 225, to be reduced, thereby reducing the brightness of the light provided from the backlight unit 200 And can be kept uniform.

The protrusions 241 may be formed of the same material as the reflection layer 240. In this case, the protrusions 241 may be formed by processing the upper surface of the reflection layer 240. [

Alternatively, the protrusions 241 may be formed of a material different from the reflective layer 240, and may be formed by printing a pattern as shown in FIG. 8 on the upper surface of the reflective layer 240.

The shape of the protruding portions 241 is not limited to that shown in Fig. 8, and various shapes such as a prism, for example, may be possible.

9 to 12 are views for explaining a method of arranging the light sources. Hereinafter, the description of the parts described in detail above will be omitted. For example, the description of the resin layer, the optical sheet, the reflective layer, etc. will be omitted below.

9, the light source 220 disposed at the outermost one of the plurality of light sources 220 disposed on the substrate 210 may be disposed close to the end of the substrate 220. [

For example, the distance D3 between the outermost light source 220 near the short side SS of the substrate 210 and the short side SS of the substrate 210 among the plurality of light sources 220, May be smaller than the distance D4 between the light source 220 and other adjacent light sources 220. In other words, between the light source 220 disposed at the outermost side in the direction parallel to the long side (LS) of the substrate 210 among the plurality of light sources 220 and the end (short side SS) of the substrate 210 The distance D3 between the light sources 220 disposed at the outermost portion and the adjacent light sources 220 may be smaller than the distance D4 between the light sources 220 disposed adjacent to the outermost portion.

The distance D1 between the longest side LS of the substrate 210 and the outermost light source 220 near the long side LS of the substrate 210 among the plurality of light sources 220 may be the same as the distance between the outermost light source 220 May be smaller than an interval (D2) between adjacent adjacent light sources (220). The distance between the light source 220 disposed at the outermost side in the direction parallel to the short side SS of the substrate 210 among the plurality of light sources 220 and the end (long side LS) of the substrate 210 D1 may be smaller than the distance D2 between the light source 220 disposed at the outermost portion and another light source 220 adjacent thereto.

10 shows an example of a top-view system in which a light source 220 emits light in a direction perpendicular to the substrate 210, that is, a direction in which the light source 220 is perpendicular to the substrate 210 . 10A and 10B, the light source 220 disposed at the outermost side of the substrate 210 is referred to as a first light source (1), and a light source adjacent to the first light source (1) 220) is referred to as a second light source (2).

When the distance D1 between the first light source 1 and the end of the substrate 210 is larger than the distance D2 between the first light source 1 and the second light source 2 as shown in FIG. It is difficult for the light generated from the first light source (1) to reach the end of the substrate 210 sufficiently. Accordingly, the end portion of the substrate 210 should be processed as a bezel region where no image is displayed. In the case of FIG. 10B, the bezel region may be excessively increased in size.

On the other hand, as shown in FIG. 10 (a), the distance D1 between the first light source 1 and the end of the substrate 210 is smaller than the distance D2 between the first light source 1 and the second light source 2, The light generated by the first light source (1) can reach the end of the substrate 210 sufficiently. Thus, the size of the bezel area can be reduced.

11 shows an example of a side view method in which a light emitting surface of a light source 220 is directed in a direction parallel to a substrate 210, that is, a light source 220 emits light in one direction with respect to the substrate 210 have. In the side view system shown in Figs. 11A and 11B, the light source 220 disposed at the outermost portion of the substrate 210 is referred to as a first light source (1), and a light source adjacent to the first light source (1) 220) is referred to as a second light source (2).

When the distance D1 between the first light source 1 and the end of the substrate 210 is larger than the distance D2 between the first light source 1 and the second light source 2 as shown in FIG. 11 (b) , The light generated from the first light source (1) may not reach the end of the substrate 210 sufficiently, and the size of the bezel region may excessively increase.

In addition, when the first light source (1) diverges light toward the second light source (2), the end of the substrate 210 may be substantially dark.

11 (a), the distance D1 between the first light source and the end of the substrate 210 is smaller than the distance D2 between the first light source and the second light source, The size of the bezel area which does not contribute to the image display can be reduced.

As described with reference to FIGS. 10 to 11, the size of the bezel region can be reduced in both the top-view type and the side-view type.

12, the spacing D1 and D5 between the light sources 220 disposed on both ends of the plurality of light sources 220 arranged in parallel and the ends of the substrate 210 correspond to two adjacent light sources 220, May be smaller than an interval (D2).

For example, as shown in FIG. 12, a plurality of light sources 220 may be disposed on a substrate 210 (not shown) to emit light in a direction from the first side S1 of the substrate 210 toward the second side S2 of the substrate 210 As shown in FIG.

In this case, the distance D1 between the first light source (1) adjacent to the first side S1 of the substrate 210 and the end of the adjacent substrate 210 is shorter than the distance between the first light source (1) The distance D5 between the fifth light source 5 that is smaller than the interval D2 between the first light source 5 and the second substrate S2 and adjacent to the second side S2 of the substrate 210, May be smaller than an interval (D2) between the first light source (1) and the second light source (2).

In addition, the first light source (1) emits light in a direction away from the end of the adjacent substrate 210, that is, toward the second light source (2), and the fifth light source (5) The distance D1 between the first light source 1 and the end of the adjacent substrate 210 is larger than the distance between the fifth light source 5 and the second light source 5, And the distance D5 between the ends of the adjacent substrates 210. [

13 to 18 are diagrams for explaining another example of a method of arranging light sources. In the following, description of the parts described above is omitted.

13, at least one of the plurality of light sources 220 disposed on the substrate 210 is capable of emitting light in a direction different from the rest. For example, at least one of the plurality of light sources 220 may emit light in the left direction of the substrate 210, and at least one of the remaining light sources 220 may emit light in the right direction of the substrate 210 will be. The light diverging direction of the light source 220 is not limited to Fig.

For example, at least one light source 220 may emit light laterally in a direction parallel to the + X axis, and at least one of the remaining light sources 220 may emit light laterally along the -X axis. In addition, a light source 220 that emits light in a direction parallel to the + X axis and a light source 220 that emits light in a direction parallel to the -X axis may be disposed adjacent to each other in the Y axis direction. That is, as shown in FIG. 13, any two light sources 220 may be arranged to be adjacent to each other in the diagonal direction. In FIG. 13, the direction in which the light emitting surface 1300 of the light source 220 faces is indicated by an arrow.

13, the plurality of light sources 220 may be arranged to form two or more rows, and two or more light sources 220 disposed in the same row may emit light in the same direction.

As described above, by making the light divergence directions of the arbitrary two light sources 220 different from each other, it is possible to reduce the phenomenon that the brightness of light is concentrated or weakened in a specific region of the backlight unit, and the brightness of light emitted from the backlight unit 200 is reduced It can be made uniform.

Meanwhile, when the light divergence directions of two arbitrary light sources 220 are different from each other, the light divergence directions of the outermost light sources 220 may be different from each other.

13, the outermost light sources 220, A adjacent to the first edge E1 of the substrate 210 are connected to the third edge E3 of the substrate 210 And the outermost light sources 220 and C adjacent to the third edge E3 of the substrate 210 emit light in a direction toward the first edge E1 of the substrate 210 .

On the other hand, the outermost light sources 220, B adjacent to the second edge E2 of the substrate 210 emit light in the direction toward the fourth edge (E4) of the substrate 210 And the outermost light sources 220, B, and D adjacent to the second edge E2 and the fourth edge E4 of the substrate 210 are aligned in the direction toward the third edge E3 of the substrate 210 .

Here, the first edge E1 and the third edge E3 of the substrate 210 face each other, and the second edge E2 and the fourth edge E4 may also face each other.

In addition, the light sources 220, A, and C disposed at the outermost side in the light diverging direction can diverge light in a direction away from the end of the adjacent substrate 210. In this case, the light efficiency can be improved.

13, the outermost light sources 220, A adjacent to the first edge E1 of the substrate 210 may emit light toward the first edge E1, Suppose that the outermost light sources 220, C adjacent to the third edge E3 emit light in a direction toward the third edge E3 of the substrate 210. [ In this case, a part of the light emitted by the outermost light source 220 (A) adjacent to the first edge E1 or the outermost light source 220 (C) adjacent to the third edge E3 of the substrate 210 It can not sufficiently utilize the light for image display because it is out of the region of the substrate 210. Thus, the light efficiency may be low.

On the other hand, the outermost light sources 220, A adjacent to the first edge E1 of the substrate 210 diverge light toward the third edge E3 and the third edge E3 of the substrate 210 emits light, The light emitted from the outermost light sources 220, A, and C is emitted to the image display unit 220. In this case, when the outermost light sources 220 and 220 adjacent to the light source 220 emit light toward the first edge E1 of the substrate 210, . Thus, the light efficiency can be improved.

When the light sources 220 that emit light in different directions are disposed on the substrate 210, the distance between the light sources 220 disposed at the outermost portion and the ends of the substrate 210 is shorter than the distance May be smaller than an interval between the light sources 220 and adjacent light sources 220.

14, the first light source (1) is disposed adjacent to the first edge (E1), the second light source (2) is disposed adjacent to the first light source (1), and the third light source 3) is disposed adjacent to the fourth edge E4 adjacent to the first edge E1 and the fourth light source 4 is disposed adjacent to the third light source 3.

In this case, the distance D1 between the first light source 1 and the first edge E1 of the substrate 210 in the horizontal direction (X-axis direction) of the substrate 210 corresponds to the distance between the first light source (1) The distance D3 between the third light source 3 and the fourth edge E4 of the substrate 210 in the vertical direction (Y-axis direction) of the substrate 210 is smaller than the distance D2 between the light sources 2, May be smaller than the distance D4 between the third light source (3) and the fourth light source (4).

15, a straight line passing through the first light source (1) perpendicular to the end (first edge E1) of the substrate 210 is referred to as a first straight line L1, (1) and the end of the substrate 210 (the second light source) are parallel to the end (first edge E1) of the first light source 210 and the straight line passing through the second light source 1 edge E1 may be smaller than a distance D between the point P where the first straight line L1 and the second straight line L2 meet and the first light source 1 . This is because of the reason that the first light source (1) and the second light source (2) are arranged alternately. Of course, the shortest distance D1 between the first light source (1) and the end (first edge E1) of the substrate 210 is the shortest distance D1 between the first light source (1) and the second light source (2) ).

The direction in which the light emitting surface 1300 of the first light source 1 is directed and the direction in which the light emitting surface 1300 of the second light source 2 is directed are different from each other. Preferably, the light emitting surface 1300 of the second light source 1300 is directed toward the end of the substrate 210 (first edge E1) and the direction of the light emitting surface 1300 of the first light source (1) is toward the light emitting surface 1300 of the second light source The opposite of direction.

That is, the interval D2 in the direction parallel to the light divergence direction between the adjacent two light sources 220 that diverge light in mutually opposite directions is the distance D2 between the outermost light source 220 and the end of the substrate 210 adjacent thereto Is larger than the interval D1.

14, the distance D1 between the first light source (1) and the first edge E1 of the substrate 210 in the horizontal direction (X-axis direction) of the substrate 210 corresponds to the distance May be different from the distance D3 between the third light source 3 in the vertical direction (Y-axis direction) and the fourth edge E4 of the substrate 210.

For example, as shown in FIGS. 16A and 16B, when the light emitting surface of the light source 220 emits light in a direction parallel to the short side SS of the substrate 210, the short side of the substrate 210 The distance D1 between the long side LS of the substrate 210 and the light source 220 disposed adjacent to the long side LS of the substrate 210 in the direction parallel to the substrate SS is shorter than the short side SS The distance D3 between the light source 220 disposed adjacent to the substrate 210 and the short side SS of the substrate 210. [

Since the light source 220 emits light in a direction parallel to the short side SS of the substrate 210, a part of the light emitted by the light source 220, which is disposed adjacent to the short side SS of the substrate 210, (SS). The size of the bezel region is sufficiently small even when the distance D3 between the short sides SS of the light source 220 and the substrate 210 disposed adjacent to the short side SS of the substrate 210 is relatively large .

On the other hand, since the light source 220 adjacent to the long side LS of the substrate 210 emits light in a direction away from the long side LS, the intensity of the light reaching the long side LS of the substrate 210 is relatively weak . In order to prevent the bezel area from becoming excessively large, a light source 220 and a substrate 210, which are disposed adjacent to the long side LS of the substrate 210 in a direction parallel to the short side SS of the substrate 210, The distance D1 between the long sides LS of the substrate 210 is preferably smaller than the distance D3 between the light source 220 disposed adjacent to the short side SS of the substrate 210 and the short side SS of the substrate 210 You can do it.

17, when the light source 220 emits light in a direction parallel to the short side SS of the substrate 220, the light source 220 disposed at the corner of the substrate 210 And the long side LS of the substrate 210 is a distance D3 between the light source 220 disposed at the corner of the substrate 210 and the short side LS of the substrate 210. [ .

The plurality of light sources 220 may be disposed such that the light emitting surface 1300 faces the side SS of the substrate 210. It is preferable that the light emitting surface 1300 of the light source 220 adjacent to the long side LS of the substrate 210 among the plurality of light sources 220 is disposed so as to face away from the long side of the adjacent substrate 210 .

18B, the light sources 220, X2, and Y2 disposed on the short side SS of the substrate 210 emit light in a direction parallel to the short side SS of the substrate 210, can do.

18 (b), when the light sources 220, X1, and Y1 disposed on the long side LS of the substrate 210 diverge light in a direction parallel to the long side LS of the substrate 210 The light efficiency can be reduced. This is because a part of the light diverged by the plurality of light sources 220, X1 and Y1 disposed on the long side LS of the substrate 210 may deviate from the area of the substrate 210. [

18 (b), the light sources 220, X2, and Y2 disposed on the short side SS of the substrate 210 emit light in a direction parallel to the short side SS of the substrate 210 The number of the light sources 220 that emit light to deviate from the area of the substrate 210 can be reduced as compared with the case of FIG. 18 (a). Thus, it is possible to improve the light efficiency as compared with FIG. 18 (a).

19 to 20 are views for explaining the number of light sources arranged on the substrate. Hereinafter, the description of the parts described in detail above will be omitted.

19, a plurality of light sources 220 disposed on a substrate 210 includes a first light source 221 that emits light in a first direction and a second light source 220 that emits light in a second direction opposite to the first direction And may include a second light source 222. In addition, the number of the first light sources 221 and the number of the second light sources 222 may be the same. For example, the number of the first light sources 221 disposed on the tenth straight line L10 may be the same as the number of the second light sources 222 disposed on the eleventh straight line L11. Here, the tenth straight line L10 and the eleventh straight line L11 may be parallel to the long side LS of the substrate 210. The number of the first light sources 221 disposed on the twentieth straight line L20 may be the same as the number of the second light sources 222 disposed on the twenty first straight line L21. Here, the twentieth straight line L20 and the twenty first straight line L21 may be aligned with the short side SS of the substrate 210.

In this case, the spacing between the light sources 220 disposed on both ends of the plurality of light sources 220 disposed side by side and the ends of the adjacent substrates 220 may be different from each other.

19, the light source 220 and the fourth edge E4, which are close to the fourth edge E4 of the substrate 210 among the plurality of light sources 220 disposed on the tenth straight line L10, The distance D3 between the second edge E2 and the second edge E2 of the substrate 210 may be different from the distance D30 between the second edge E2 and the light source 220 adjacent to the second edge E2 of the substrate 210. [ Preferably, D30 can be greater than D3. The distance D3 between the fourth edge E4 and the light source 220 in the vicinity of the fourth edge E4 of the substrate 210 among the plurality of light sources 220 disposed on the tenth straight line L10 is May be smaller than an interval D4 between two adjacent light sources 220 in a direction parallel to the light diverging direction.

Here, the light source 220 in the vicinity of the second edge E2 of the substrate 210 is not the outermost light source 220, so that D30 may be larger than D4. The interval D30 between the light source 220 and the second edge E2 in the vicinity of the second edge E2 of the substrate 210 is set to be shorter than the interval D30 between the two adjacent light sources 220 on the tenth straight line L10 (D40).

Alternatively, as shown in FIG. 20, the number of the first light sources 221 may be different from the number of the second light sources 222. For example, the number of the first light sources 221 disposed on the tenth straight line L10 may be different from the number of the second light sources 222 disposed on the eleventh straight line L11. On the other hand, the number of the first light sources 221 disposed on the twentieth straight line L20 may be the same as the number of the second light sources 222 disposed on the twenty first straight line L21.

In this case, the distance between the light sources 220 disposed at both ends of the plurality of light sources 220 disposed side by side and the ends of the adjacent substrate 220 can be substantially the same.

20, between the light source 220 and the fourth edge E4 in the vicinity of the fourth edge E4 of the substrate 210 among the plurality of light sources 220 disposed on the tenth straight line L10, The interval D3 may be smaller than the interval D4 between two adjacent light sources 220 in the direction parallel to the light diverging direction. The interval D30 between the second edge E2 and the light source 220 in the vicinity of the second edge E2 of the substrate 210 among the plurality of light sources 220 disposed on the tenth straight line L10 May be smaller than an interval D4 between two adjacent light sources 220 in a direction parallel to the light diverging direction.

As described above, it is to be understood that the technical structure of the present invention can be embodied in other specific forms without departing from the spirit and essential characteristics of the present invention.

It should be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, And all changes or modifications derived from equivalents thereof should be construed as being included within the scope of the present invention.

Claims (18)

Board; And
A plurality of light sources disposed on the substrate;
/ RTI >
The plurality of light sources emits light from a first side of the substrate toward a second side facing the first side,
Wherein a distance between a first light source disposed at an outermost one of the plurality of light sources adjacent to the first side and the first side,
And a distance between the second light source disposed at the outermost one of the plurality of light sources adjacent to the second side and the second side. The method according to claim 1,
Wherein the light source includes a light emitting diode. The method according to claim 1,
Wherein a distance between the first light source and the first side is smaller than an interval between the first light source and a third light source adjacent to the first light source. The method according to claim 1,
Wherein the light source faces the light emitting surface in a direction parallel to the substrate. The method according to claim 1,
A straight line passing through the first light source and being perpendicular to the end of the substrate is referred to as a first straight line and a straight line passing through the third light source parallel to the end of the substrate and adjacent to the first light source is referred to as a second straight line,
Wherein the shortest distance between the first light source and the end of the substrate is smaller than the distance between the first straight line and the second straight line and the distance between the first light sources. delete delete delete delete delete delete delete delete delete A display panel; And
A backlight unit attached to a back surface of the display panel;
/ RTI >
The backlight unit
Board; And
A plurality of light sources disposed on the substrate;
/ RTI >
The plurality of light sources emits light from a first side of the substrate toward a second side facing the first side,
Wherein a distance between a first light source disposed at an outermost one of the plurality of light sources adjacent to the first side and the first side,
Wherein the distance between the first light source and the second light source is smaller than the distance between the second light source and the second side disposed at the outermost one of the plurality of light sources adjacent to the second side. delete delete delete

Images