KR20110104834A - Back light unit and display apparatus - Google Patents

Abstract

The present invention relates to a backlight unit and a display device.
The backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, wherein a distance between a first light source disposed at the outermost of the plurality of light sources and an end of the substrate is adjacent to the first light source. It may be smaller than the distance between the second light source.
In addition, another backlight unit according to the present invention may include a substrate and a plurality of light sources disposed on the substrate, and the plurality of light sources may be disposed such that a light emitting surface faces a direction parallel to a short side of the substrate.

Description

Back Light Unit and Display Apparatus

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

As the information society develops, the demand for display devices is increasing in various forms, and in recent years, liquid crystal display devices (LCDs), plasma display panels (PDPs), electro luminescent displays (ELDs), and vacuum fluorescents (VFDs) have been developed. Various display devices such as displays have been researched and used. Among them, the liquid crystal panel of the LCD includes a TFT substrate and a color filter substrate facing each other with the liquid crystal layer and the liquid crystal layer interposed therebetween, and can display an image using light provided from the backlight unit.

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

The backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, wherein a distance between a first light source disposed at the outermost of the plurality of light sources and an end of the substrate is adjacent to the first light source. It may be smaller than the distance between the second light source.

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

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

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

In addition, when a straight line perpendicular to the end of the substrate and passing through the first light source is called a first straight line, and a straight line parallel to the end of the substrate and passes through the second light source is called a second straight line, The shortest distance between the ends of the substrate may be smaller than the distance between the point where the first straight line and the second straight line meet and the first light source.

In addition, the first light source and the second light source may have a light emitting surface facing 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.

In addition, the light emitting surface of the second light source may face 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.

In addition, another backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, and the substrate includes a first edge and a second edge adjacent to the first edge. And 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 a distance between the first edge and the first light source is determined by the second edge and the It may be different from the spacing between the third light source.

Also, a distance between the first edge and the first light source is smaller than a distance between the first light source and a second adjacent light source, and a distance between the second edge and the third light source is adjacent to the third light source. 4 may be less than the distance between light sources.

In addition, the first light source and the third light source has a light emitting surface facing the direction parallel to the first edge, the interval between the first edge and the first light source is the interval between the second edge and the third light source. Can be greater than

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

In addition, another backlight unit according to the present invention includes a substrate and a plurality of light sources disposed on the substrate, the light source is disposed so that the light emitting surface is in parallel with the substrate, the light emitting surface is in parallel with the direction facing The first light source disposed at the outermost of the plurality of light sources in the direction may emit light in a direction away from the end of the adjacent substrate.

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

In addition, the light emitting surface of the light source adjacent to the long side of the substrate of the plurality of light sources may be disposed to face away from the long side of the adjacent substrate.

A display apparatus according to the present invention includes a display panel and a backlight unit attached to a rear surface of the display panel, wherein the backlight unit includes a substrate and a plurality of light sources disposed on the substrate, and is disposed at the outermost of the plurality of light sources. An interval between the first light source disposed and an end of the substrate may be smaller than an interval between the first light source and an adjacent second light source.

Another display apparatus according to the present invention includes a display panel and a backlight unit attached to a rear surface of the display panel, wherein the backlight unit includes a substrate and a plurality of light sources disposed on the substrate, and the substrate has a first edge ( A first edge and a second edge adjacent to the first edge, 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, An interval between the first edge and the first light source may be different from an interval between the second edge and the third light source.

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

Another display apparatus according to the present invention includes a display panel and a backlight unit attached to a rear surface of the display panel, the backlight unit including a substrate and a plurality of light sources disposed on the substrate, and the plurality of light sources emits light. The surface may be disposed to face in a direction parallel to the short side of the substrate.

The backlight and display apparatus according to the present invention has an effect of increasing the light efficiency and reducing the thickness by improving the arrangement method of the plurality of light sources disposed on the substrate.

1 is an exploded perspective view showing the 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;
5 to 8 are views for explaining the direct method;
9 to 12 are views for explaining the arrangement method of the light source;
13 to 18 are diagrams for explaining still another example of the arrangement method of the light source; And
19 to 20 are diagrams for explaining the number of light sources arranged on a substrate.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. 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, terms such as first and second may be used to describe various components, but the components may not be limited by the terms. The terms may be used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.

The term and / or may include a combination of a plurality of related items or any item of a plurality of related 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 herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present 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.

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

Referring to 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 rear 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 external impact.

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

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

The display panel 100 may include a color filter substrate 110 and a thin film transistor (TFT) substrate 120 bonded to face 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 including red (R), green (G), and blue (B) sub-pixels, and generates an image corresponding to the color of red, green, or blue when light is applied. You can.

The pixels may include red, green, and blue subpixels, but the red, green, blue, and white (W) subpixels constitute one pixel, but are not necessarily limited thereto, and may be configured in various combinations.

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

The liquid crystal layer is composed of a plurality of liquid crystal molecules, and the liquid crystal molecules may change an arrangement corresponding to a voltage difference generated between a pixel electrode and a common electrode, which are not shown. Accordingly, the liquid crystal molecules may be provided from the backlight unit 200. Light may be incident on the color filter substrate 110 in response to a change in the molecular arrangement of the liquid crystal layer.

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

Side of the display panel 100 may be provided with a gate and a data driver (not shown) for generating a driving signal for driving the panel 100.

The structure and configuration of the display panel 100 as described above is merely an example, and the embodiments may be changed, added, or deleted within the scope of the spirit of the present invention.

As shown in FIG. 2, the display apparatus according to the exemplary embodiment of the present invention may be configured by closely placing the backlight unit 200 on the display panel 100. For example, the backlight unit 200 may be attached to and fixed to the lower side of the display panel 100, more specifically, the lower polarizer 140, and for this purpose, between the lower polarizer 140 and the backlight unit 200. An adhesive layer (not shown) may be formed on the substrate.

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

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

In addition, as described above, in order for the backlight unit 200 to be closely fixed to the lower surface of the display panel 100, the plurality of layers constituting the backlight unit 200, more specifically, the backlight unit 200 may be provided. It is preferable that it is comprised from the material which has ductility, respectively.

In addition, a bottom cover (not shown) on which the backlight unit 200 is seated may be provided below the backlight unit 200.

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

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

3 is a cross-sectional view 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.

Although not illustrated, an electrode pattern (not shown) for connecting the connector (not shown) and the light source 220 may be formed on the substrate 210. For example, a carbon nanotube electrode pattern (not shown) may be formed on the upper surface of the substrate 210 to connect the light source 220 and the connector. 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 materials such as polyethylene terephthalate, glass, polycarbonate and silicon. 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 this embodiment, a light emitting diode package is provided as the light source 220.

The light source 220 may be a colored LED or a white LED emitting at least one of colors such as red, blue, and green. In addition, the colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of the light emitting diode may be changed within the technical scope of the embodiment.

On the other hand, the resin layer 230 disposed on the upper side of the substrate 210 transmits and diffuses the light emitted from the light source 220, and the light emitted from the light source 220 is uniformly distributed to the display panel 100. Can be provided.

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

The reflective layer 240 may reflect the light totally reflected from the boundary of the resin layer 230 so that the light emitted from the light source 220 may be diffused more widely.

The reflective layer 240 may include a white pigment such as titanium oxide dispersed in a sheet of synthetic resin, a metal deposition film laminated on the surface, or a bubble dispersed to scatter light in a synthetic resin sheet. In order to increase the reflectance, silver (Ag) may be coated on the surface. Alternatively, the reflective layer 240 may be formed by coating the upper surface of the substrate 210.

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

In addition, in order for the light emitted from the light source 220 to be diffused so that the backlight unit 200 has uniform luminance, the refractive index of the resin layer 230 may be about 1.4 to 1.6.

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

The resin layer 230 may be formed by applying a resin on a liquid or gel 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. It is also possible to be formed separately 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 may be spread more widely, and light of uniform brightness may be provided from the backlight unit 200 to the display panel 100. On the other hand, as the thickness a of the second layer 230 increases, the amount of light absorbed by the second layer 230 may increase, thereby providing the display panel 100 from the backlight unit 200. The brightness of the light may be reduced overall.

Therefore, in order to provide light of uniform brightness without greatly reducing the brightness of the light provided from the backlight unit 200 to the display panel 100, the thickness a of the resin layer 230 may be 0.1 to 4.5 mm. desirable.

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

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

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

The scattering particles 231 may be formed of a material having a refractive index different from that of the material of the resin layer 230, and more particularly of the silicon of the resin layer 230 in order to scatter or refract light emitted from the light source 220. Or it may be made of a material having a higher refractive index than the acrylic resin.

For example, the scattering particles 231 may be polymethyl methacrylate / styrene copolymer (MS), polymethyl methacrylate (PMMA), polystyrene (PS), silicon, titanium dioxide (TiO2), silicon dioxide (SiO2). ), Or a combination of the above materials.

On the other hand, the scattering particles 231 may be made of a material having a lower refractive index than the material constituting the resin layer 230, for example, may be formed by forming a bubble in the resin layer (230). .

In addition, the material constituting the scattering particles 231 is not limited to the above materials, and may be formed using various polymer materials or inorganic particles.

According to the exemplary embodiment of the present invention, the resin layer 230 is a substrate 210 in which a plurality of light sources 220 and a reflective layer 240 are formed after mixing the scattering particles 231 in a liquid or gel resin. It may be formed by applying to the upper surface of the) and then curing.

Referring to FIG. 4, an optical sheet 250 may be disposed above the resin layer 230, and 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 may be provided in a state of being bonded or adhered to each other without being spaced apart from each other, thereby minimizing the thickness of the optical sheet 250 or the backlight unit 200.

On the other hand, the lower surface of the optical sheet 250 is in close contact with the resin layer 230, the upper surface of the optical sheet 250 is in close contact with the lower surface of the display panel 100, more specifically, the lower polarizing plate 140. Can be.

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

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

The LED package constituting the light source 220 in the direct method may be divided into a top view method and a side view method according to a direction in which the light emitting surface is directed. This is described below.

5 to 8 are views for explaining the direct method.

FIG. 5 is a view illustrating a top view method of the direct method.

Referring to FIG. 5, the light emitting surfaces of the plurality of light sources 220 provided in the backlight unit 200 are disposed on an upper surface thereof, respectively, in a direction perpendicular to the upper direction, for example, the substrate 210 or the reflective layer 240. It can emit light.

FIG. 6 illustrates a side view of the direct method.

Referring to FIG. 6, each of the light sources 220 provided in the backlight unit 200 has a light emitting surface disposed on a side thereof, and emits 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 observed as a hot spot on the screen. In addition, the thickness (a) of the resin layer 230 may be reduced to reduce the thickness 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.

Light emitted from the light source 220 to the side may pass through the first resin layer 230 and may proceed to an area where the adjacent light source 225 is disposed.

Some of the light that passes through the first resin layer 230 may be emitted to an upper side of the display panel 100. To this end, 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 advancing light in an upward direction.

In addition, 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 may be emitted in an area adjacent to the light source 220 due to a strong scattering phenomenon near the light source 220 or light emitted from the light source 220 in a direction closer to the upper side, and the like. Light of brightness can be observed. In order to prevent this, as shown in FIG. 7, the first light blocking pattern 260 may be formed on the first resin layer 230 to reduce the luminance of light emitted from the region adjacent to the light source 220. Accordingly, light of uniform brightness may be emitted from the backlight unit 200. For example, the first light blocking pattern 260 may be formed on the first resin layer 230 so as to correspond to the position where the plurality of light sources 220 are disposed, and a part of the light incident from the light source 220 may be formed. It can block and transmit the remaining part to reduce the brightness of the light emitted upwards.

The first light blocking pattern 260 may be formed of titanium dioxide (TiO 2), and in this case, a part of the light incident from the light source 220 may be reflected downward and transmit the remaining part.

According to an embodiment of the present invention, the second resin layer 235 may be disposed above the first resin layer 230. The second resin layer 235 may be made of the same or different material as that of the first resin layer 230, and diffuses light emitted from the first resin layer 230 in the upward direction of the backlight unit 200. The uniformity of optical brightness can be improved.

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

For example, when the second resin layer 235 is made of a material having a refractive index higher than that of the first resin layer 230, light emitted from the first resin layer 230 may 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, the light emitted from the first resin layer 230 is reflected on the bottom surface of the second resin layer 235. The reflectance may be improved, and thus, light emitted from the light source 220 may be made to travel along the first resin layer 230 more easily.

Meanwhile, 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 the first resin layer. It may be higher than the density of the scattering particles included in (230). As such, when the scattering particles are included in the second resin layer 235 at a higher density, the light emitted upward from the first resin layer 230 may be diffused more widely, and accordingly, the backlight unit 200 may be diffused. The luminance of the light emitted from the screen can be made more uniform.

As shown in FIG. 7, the second light blocking pattern 265 is formed on the upper side of the second resin layer 235 to make the luminance of the light emitted from the second resin layer 235 uniform. For example, when light emitted upward from the second resin layer 235 is concentrated at a specific portion and observed with high luminance on the screen, an area corresponding to the specific portion of the upper surface of the second resin layer 235 is observed. The second light blocking pattern 265 may be formed at the upper portion of the second light blocking pattern 265, thereby reducing the luminance of the light in the specific portion, thereby making the luminance of the light emitted from the backlight unit 200 uniform.

The second light blocking pattern 265 may be formed of titanium dioxide (TiO 2). In this case, part of the light emitted from the second resin layer 235 is reflected downward from the second light blocking pattern 265, and the other part Can be permeable.

Referring to FIG. 8, a pattern may be formed in the reflective layer 240 to facilitate the progress of light emitted from the light source 220 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, and the light incident on the plurality of protrusions 241 after being emitted from the light source 220 is scattered in the advancing direction. Can be refracted.

As illustrated in FIG. 8, the densities of the protrusions 241 formed in the reflective layer 240 may increase as they are spaced apart from the light source 220, that is, closer to the adjacent light source 225. Accordingly, it is possible to prevent the luminance of the light emitted upward from the region far from the light source 220, that is, the region close to the adjacent light source 225, to thereby reduce the luminance of the light provided from the backlight unit 200. It can be kept uniform.

In addition, the protrusions 241 may be formed of the same material as the reflective layer 240, and in this case, the protrusions 241 may be formed by processing an upper surface of the reflective layer 240.

Alternatively, the protrusions 241 may be formed of a material different from that of 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.

Shapes of the protrusions 241 are not limited to those shown in FIG. 8, and various shapes such as prisms may be possible.

9 to 12 are diagrams for explaining the arrangement method of the light source. Hereinafter, the description of the parts described in detail above will be omitted. For example, description of a resin layer, an optical sheet, a reflection layer, etc. is abbreviate | omitted below.

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

For example, the distance D3 between the outermost light source 220 adjacent to the short side SS of the substrate 210 and the short side SS of the substrate 210 of the plurality of light sources 220 is the outermost. It may be smaller than the distance D4 between the light source 220 and another adjacent light source 220. In other words, between the light source 220 disposed at the outermost side of the plurality of light sources 220 in a direction parallel to the long side LS of the substrate 210 and an end (short side SS) of the substrate 210. The interval D3 may be smaller than the interval D4 between the light source 220 disposed at the outermost side and the other light sources 220 adjacent to each other.

Alternatively, the distance D1 between the outermost light source 220 adjacent to the long side LS of the substrate 210 and the long side LS of the substrate 210 may be the outermost light source 220. It may be smaller than the distance D2 between other adjacent light sources 220. In other words, 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 and the end (long side LS) of the substrate 210 among the plurality of light sources 220 ( D1) may be smaller than the distance D2 between the light source 220 disposed at the outermost side and the other light source 220 adjacent thereto.

10 illustrates an example of a top-view method in which a light emitting surface of the light source 220 faces a direction perpendicular to the substrate 210, that is, a light source 220 emits light in a direction perpendicular to the substrate 210. It is. In the top-view method of FIGS. 10A and 10B, 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. Let 220 be a second light source ②.

As shown in FIG. 10B, when the distance D1 between the end of the first light source ① and the substrate 210 is greater than the distance D2 between the first light source ① and the second light source ②. It is difficult for the light generated by the first light source ① to reach the end of the substrate 210 sufficiently. Accordingly, the end portion of the substrate 210 should be treated as a bezel area in which an image is not displayed. In the case of FIG. 10B, the size of the bezel area may be excessively increased.

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

11 illustrates an example of a side-view method in which a light emitting surface of the light source 220 faces a direction parallel to the substrate 210, that is, the light source 220 emits light in a direction in which the light source 220 is aligned with the substrate 210. have. In the side-view method of FIGS. 11A and 11B, the light source 220 disposed at the outermost side of the substrate 210 is called a first light source ①, and a light source adjacent to the first light source ① is formed. Let 220 be a second light source ②.

When the distance D1 between the end of the first light source ① and 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. 11B. In this case, the light generated by the first light source ① may not reach the end of the substrate 210 sufficiently, and the size of the bezel region may be excessively increased.

In addition, when the first light source ① emits light toward the second light source ②, the end of the substrate 210 may be substantially a dark portion.

On the other hand, as shown in FIG. 11A, the distance D1 between the end of the first light source ① and the substrate 210 is the distance D2 between the first light source ① and the second light source ②. In a smaller case, the size of the bezel area that does not contribute to image display can be reduced.

As described with reference to FIGS. 10 through 11, the size of the bezel area may be reduced in the case where the light source 220 is the top-view type and the side-view type.

12, the distances D1 and D5 between the light sources 220 disposed at both ends of the plurality of light sources 220 arranged side by side and the ends of the substrate 210 are adjacent to each other. It may be smaller than the interval D2 therebetween.

For example, as shown in FIG. 12, the substrate 210 emits light in a direction from the first side S1 of the substrate 210 toward the second side S2 of the substrate 210. Assume a case where

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 defined by the first light source ① and the second light source. The distance D5 between the fifth light source ⑤ which is smaller than the distance D2 between (2) and adjacent to the second side S2 of the substrate 210 and the end of the adjacent substrate 210 is It may be smaller than the distance 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, in a direction toward the second light source ②, and the fifth light source ⑤ is adjacent to the substrate 210. Since light is emitted in a direction toward the end of the light source, that is, in a direction away from the second light source ②, the distance D1 between the first light source ① and the end of the adjacent substrate 210 is determined by the fifth light source ⑤. And a distance D5 between the ends of the adjacent substrate 210.

13 to 18 are diagrams for explaining still another example of the arrangement method of the light source. In the following, description of the parts described above will be omitted.

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

For example, the at least one light source 220 may laterally emit light in a direction parallel to the + X axis, and at least one of the remaining light sources 220 may emit light in the −X axis. In addition, the light source 220 emitting light in a direction parallel to the + X axis and the light source 220 emitting 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 disposed to be adjacent to each other in a diagonal direction. In FIG. 13, the direction in which the light emitting surface 1300 of the light source 220 is directed is indicated by an arrow.

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

As such, when the light divergence directions of the two arbitrary light sources 220 are different from each other, a phenomenon in which the brightness of the light is concentrated or weakened in a specific area of the backlight unit is reduced, thereby reducing the brightness of the light emitted from the backlight unit 200. It can be made uniform.

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

For example, as illustrated in FIG. 13, the outermost light sources 220 and A adjacent to the first edge E1 of the substrate 210 may serve as the third edge E3 of the substrate 210. Light is emitted in a direction toward the light source, 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. Can be.

On the other hand, the outermost light sources 220 and B adjacent to the second edge E2 of the substrate 210 emit light in a direction toward the fourth edge E4 of the substrate 210. The outermost light sources 220, B, and D adjacent to the second edge E2 and the fourth edge E4 of the substrate 210 may emit light in a direction toward the third edge E3 of the substrate 210. Can diverge.

Here, the first edge E1 and the third edge E3 of the substrate 210 may 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 emission direction may emit light in a direction away from an end of the adjacent substrate 210. In this case, the light efficiency can be improved.

For example, unlike FIG. 13, the outermost light sources 220 and A adjacent to the first edge E1 of the substrate 210 emit light toward the first edge E1, or the substrate 210 of FIG. Assume that the outermost light sources 220 and 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 sources 220 and A adjacent to the first edge E1 or the outermost light sources 220 and C adjacent to the third edge E3 of the substrate 210 Since it is out of the area of the substrate 210, the light cannot be sufficiently utilized for the image display. Accordingly, the light efficiency may be low.

On the other hand, the outermost light sources 220 and A adjacent to the first edge E1 of the substrate 210 emit light toward the third edge E3 and the third edge E3 of the substrate 210. When the outermost light sources 220, C adjacent to emit light in a direction toward the first edge E1 of the substrate 210, the image display displays the light emitted by the outermost light sources 220, A, C on the substrate 210. It can be utilized enough. Accordingly, the light efficiency can be improved.

As such, when the light sources 220 that emit light in different directions are disposed on the substrate 210, the distance between the light source 220 disposed at the outermost side and the end of the substrate 210 may be disposed at the outermost light source. It may be smaller than the distance between the 220 and other adjacent light sources 220.

For example, as shown in FIG. 14, the first light source ① is disposed adjacent to the first edge E1, and the second light source ② is disposed adjacent to the first light source ① and the third light source ( Assume that 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 is defined by the first light source ① and the second. The distance D3 between the third light source ③ and the fourth edge E4 of the substrate 210 is smaller than the distance D2 between the light sources ② and in the vertical direction (Y-axis direction) of the substrate 210. May be smaller than the distance D4 between the third light source ③ and the fourth light source 4.

In other words, as shown in FIG. 15, the straight line perpendicular to the end (first edge E1) of the substrate 210 and passing through the first light source ① is referred to as a first straight line L1, and the substrate ( When the straight line parallel to the end (first edge E1) of 210 and passing through the second light source ② is called the second straight line L2, the end of the first light source ① and the substrate 210 (first) The shortest distance D1 between the first edge E1 may be smaller than the distance D2 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 due to the reason why the first light source ① and the second light source ② are alternately arranged. Of course, the shortest distance D1 between the first light source ① and the end (first edge E1) of the substrate 210 is a straight line distance D6 between the first light source ① and the second light source ②. May be less than).

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

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

In addition, as shown in FIG. 14, in the horizontal direction (X-axis direction) of the substrate 210, the distance D1 between the first light source ① and the first edge E1 of the substrate 210 is determined by the width of the substrate 210. The distance D3 between the third light source ③ and the fourth edge E4 of the substrate 210 may be different in the vertical direction (Y-axis direction).

For example, as shown in FIG. 16A and FIG. 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 is emitted. A distance D1 between the light source 220 disposed adjacent to the long side LS of the substrate 210 and the long side LS of the substrate 210 in a direction parallel to the SS is a short side SS of the substrate 210. ) May be smaller than the distance D3 between the light source 220 disposed adjacent to the light source 220 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 disposed adjacent to the short side SS of the substrate 210 is partially exposed to the substrate 210. Can reach the short side SS. Accordingly, the size of the bezel area may be sufficiently small even when the distance D3 between the light source 220 disposed near the short side SS of the substrate 210 and the short side SS of the substrate 210 is relatively large. Can be.

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 light reaching the long side LS of the substrate 210 may be relatively weak. Can be. Accordingly, in order to prevent the size of the bezel area from being excessively large, the light source 220 and the substrate 210 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 may be smaller than the distance D3 between the light source 220 disposed near the short side SS of the substrate 210 and the short side SS of the substrate 210. You can do it.

For another example, as shown in FIG. 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 a corner of the substrate 210. ) And the distance D1 between 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. Can be greater than

Meanwhile, the plurality of light sources 220 may be disposed such that the light emitting surface 1300 faces a direction parallel to the short side SS of the substrate 210. In addition, the light emitting surface 1300 of the light source 220 adjacent to the long side LS of the substrate 210 of the plurality of light sources 220 may be disposed to face away from the long side of the adjacent substrate 210. Can be.

For example, as illustrated in FIG. 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.

18B, when the light sources 220, X1, and Y1 disposed on the long side LS of the substrate 210 emit light in a direction parallel to the long side LS of the substrate 210. The light efficiency may decrease. This is because some of the light emitted by the plurality of light sources 220, X1, and Y1 disposed on the long side LS of the substrate 210 may be out of the region of the substrate 210.

On the other hand, as shown in FIG. 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. When arranged, the number of light sources 220 that emit light to escape the area of the substrate 210 may be reduced compared to the case of FIG. 18A. Thereby, it is possible to improve light efficiency compared with FIG. 18A.

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

Referring to FIG. 19, a plurality of light sources 220 disposed on one substrate 210 may emit light in a second direction opposite to the first direction and a first light source 221 that emits light in a first direction. It 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 first light sources 221 disposed on the tenth straight line L10 may be the same as the number of 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. In addition, the number of first light sources 221 disposed on the twentieth straight line L20 may be equal to the number of 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 parallel to the short side SS of the substrate 210.

In this case, an interval between the light sources 220 disposed at both ends of the plurality of light sources 220 arranged side by side and the ends of the adjacent substrate 220 may be different from each other.

For example, as shown in FIG. 19, the light source 220 and the fourth edge E4 that 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 interval D3 may be different from the interval D30 between the light source 220 and the second edge E2 proximate the second edge E2 of the substrate 210. Preferably, D30 may be greater than D3. In addition, an interval D3 between the light source 220 and the fourth edge E4, which is close to the fourth edge E4 of the substrate 210, of the plurality of light sources 220 disposed on the tenth straight line L10 may be determined. It may be smaller than the distance D4 between two light sources 220 adjacent in the direction parallel to the light diverging direction.

Here, the light source 220 adjacent to the second edge E2 of the substrate 210 is not the outermost light source 220, and thus, D30 may be larger than D4. In addition, the distance D30 between the light source 220 and the second edge E2 proximate the second edge E2 of the substrate 210 is the distance between two adjacent light sources 220 on the tenth straight line L10. It may be smaller than (D40).

Alternatively, as shown in FIG. 20, the number of first light sources 221 and the number of second light sources 222 may be different. 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. The number of first light sources 221 disposed on the twentieth straight line L20 may be the same as the number of 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 arranged side by side and the ends of the adjacent substrate 220 may be substantially the same.

In addition, as shown in FIG. 20, between 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 may be smaller than the distance D4 between two adjacent light sources 220 in a direction parallel to the light emission direction. In addition, an interval D30 between the light source 220 and the second edge E2, which are close to the second edge E2 of the substrate 210, among the plurality of light sources 220 disposed on the tenth straight line L10. It may be smaller than the distance D4 between two light sources 220 adjacent in the 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.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

Claims (18)

Board; And
A plurality of light sources disposed on the substrate;
Including,
And a distance between a first light source disposed at the outermost of the plurality of light sources and an end of the substrate is smaller than a distance between the first light source and a second light source adjacent to the first light source. The method of claim 1,
The light source includes a light emitting diode. The method of claim 1,
And the light source faces a direction in which the light emitting surface is perpendicular to the substrate. The method of claim 1,
The light source has a light emitting unit facing the direction parallel to the substrate. The method of claim 1,
When a straight line perpendicular to the end of the substrate and passing through the first light source is called a first straight line, and a straight line parallel to the end of the substrate and passes through the second light source is called a second straight line,
And a shortest distance between the first light source and an end of the substrate is smaller than a distance between the point where the first straight line and the second straight line meet and the first light source. The method of claim 5, wherein
The first light source and the second light source has a light emitting surface facing a direction parallel to the substrate,
And a direction in which the light emitting surface of the first light source faces and a direction of the light emitting surface of the second light source are different from each other. The method according to claim 6,
And a light emitting surface of the second light source faces an end of the substrate, and a direction of the light emitting surface of the first light source is opposite to a direction of the light emitting surface of the second light source. Board; And
A plurality of light sources disposed on the substrate;
Including,
The substrate includes a first edge and a second edge adjacent to the first edge,
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,
And a distance between the first edge and the first light source is different from a distance between the second edge and the third light source. The method of claim 8,
A distance between the first edge and the first light source is less than a distance between the first light source and an adjacent second light source,
And a distance between the second edge and the third light source is smaller than a distance between the third light source and an adjacent fourth light source. The method of claim 8,
The first light source and the third light source has a light emitting surface facing a direction parallel to the first edge,
And a distance between the first edge and the first light source is greater than a distance between the second edge and the third light source. The method of claim 10,
The first edge is a short side of the substrate, and the second edge is a long side of the substrate. Board; And
A plurality of light sources disposed on the substrate;
Including,
The light source is disposed so that the light emitting surface faces in parallel with the substrate,
And a first light source disposed at an outermost side of the plurality of light sources in a direction parallel to a direction toward the light emitting surface to emit light in a direction away from an end of the adjacent substrate. Board; And
A plurality of light sources disposed on the substrate;
Including,
The plurality of light sources is a backlight unit is disposed so that the light emitting surface is in a direction parallel to the short side of the substrate. The method of claim 13,
And a light emitting surface of a light source adjacent to a long side of the substrate, among the plurality of light sources, facing the direction away from the long side of the adjacent substrate. Display panel; And
A backlight unit attached to a rear surface of the display panel;
Including,
The backlight unit
Board; And
A plurality of light sources disposed on the substrate;
Including,
And a distance between the first light source disposed at the outermost of the plurality of light sources and an end of the substrate is smaller than the distance between the first light source and the adjacent second light source. Display panel; And
A backlight unit attached to a rear surface of the display panel;
Including,
The backlight unit
Board; And
A plurality of light sources disposed on the substrate;
Including,
The substrate includes a first edge and a second edge adjacent to the first edge,
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,
And a spacing between the first edge and the first light source is different from a spacing between the second edge and the third light source. Display panel; And
A backlight unit attached to a rear surface of the display panel;
Including,
The backlight unit
Board; And
A plurality of light sources disposed on the substrate;
Including,
The light source is disposed so that the light emitting surface faces in parallel with the substrate,
And a first light source disposed at the outermost of the plurality of light sources to emit light in a direction away from an end of the adjacent substrate. Display panel; And
A backlight unit attached to a rear surface of the display panel;
Including,
The backlight unit
Board; And
A plurality of light sources disposed on the substrate;
Including,
And a plurality of light sources are arranged such that a light emitting surface faces a direction parallel to a short side of the substrate.

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