KR101144499B1 - optical assembly, backlight unit having the same, and display apparatus thereof - Google Patents

Abstract

Embodiments relate to a backlight unit and a display device having an optical assembly.

The backlight unit according to the embodiment includes a plurality of light guide plates each including a light source for generating light, a first part through which the light is incident, and a second part through which the light incident to the side is emitted through the first part. Optical assemblies; And a diffusion plate formed on the plurality of optical assemblies, the diffusion pattern part corresponding to a boundary area between the light guide plates.

LED, backlight unit

Description

Optical assembly, backlight unit having the same, and display apparatus

Embodiments relate to a backlight unit and a display device having an optical assembly.

Light emitting diodes (LEDs) may form light emitting sources using compound semiconductor materials such as GaAs series, AlGaAs series, GaN series, InGaN series, and InGaAlP series.

Such a light emitting diode is packaged and used as a light emitting device that emits various colors, and the light emitting device is used as a light source in various fields such as a lighting indicator for displaying colors, a character display, and an image display.

The embodiment provides a backlight unit and a display device having a new structure.

The embodiment provides a backlight unit and a display device having a uniform brightness.

The backlight unit according to the embodiment includes a plurality of light guide plates each including a light source for generating light, a first part through which the light is incident, and a second part through which the light incident to the side is emitted through the first part. Optical assemblies; And a diffusion plate formed on the plurality of optical assemblies, the diffusion pattern part corresponding to a boundary area between the light guide plates.

The display apparatus according to the embodiment includes a plurality of light guide plates each including a light source for generating light, and a first part through which the light is incident, and a second part through which the light incident to the side is emitted through the first part. Optical assemblies; And a diffusion plate on the plurality of optical assemblies, the diffusion plate having a diffusion pattern corresponding to a boundary area between the light guide plates. And a display panel provided on the backlight unit to receive light from the backlight unit and to display an image.

The backlight unit according to the embodiment can improve the generation of bright or dark lines at the boundary portions of adjacent optical assemblies, and can provide light of uniform brightness.

The display device according to the embodiment has the effect that the quality of the image can be improved by displaying the image signal with light of uniform brightness.

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings. Hereinafter, the embodiments may be modified in various forms, and the technical scope of the embodiments is not limited to the embodiments described below. The embodiments are provided so that this disclosure may be more fully understood by those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

1 is an exploded perspective view of a display device according to an embodiment.

Referring to FIG. 1, the display apparatus 1 according to the embodiment includes a display module 200, a front cover 300 and a back cover 400 surrounding the display module 200, and a display module 200. And a fixing member 500 for fixing the front cover 300 and / or the back cover 400.

One side of the fixing member 500 is fixed to the front cover 300 by a fastening member such as a screw, and the other side supports the display module 200 with respect to the front cover 300 side. The display module 200 may be fixed to the front cover 300.

In the embodiment, the fixing member 500 is described as being formed in a plate shape extending in one direction as an example. However, a separate fixing member 500 is not provided, and the display module 200 is provided by a fastening member. It will also be possible that the configuration is fixed directly to the front cover 300 or the back cover 400.

FIG. 2 is a cross-sectional view of the display module taken along the line AA of FIG. 1.

Referring to FIG. 2, the display module 200 includes a display panel 210 on which an image is displayed, a backlight unit 100 that provides light to the display panel 210, and a lower side of the display module 200. The bottom cover 110 forming the exterior, the panel supporter 240 supporting the display panel 210 from the lower side, and the display panel 210 are supported from the upper side, and the edge of the display module 200 is supported. It includes a top cover 230 to form.

The bottom cover 110 may be formed in a box shape having an upper surface opened to accommodate the backlight unit 100.

One side of the bottom cover 110 may be fixed to one side of the top cover 230. For example, a fastening member such as a screw penetrates the side surface of the display module 200, that is, the side at which the bottom cover 110 and the top cover 230 overlap, such that the bottom cover 110 and the top are formed. The cover 230 may be fixed.

Although not shown in detail, the display panel 210 is, for example, a lower substrate 211 and an upper substrate 222 bonded to each other to maintain a uniform cell gap, and a liquid crystal interposed between the two substrates. Layer. A plurality of gate lines and a plurality of data lines intersecting the plurality of gate lines are formed on the lower substrate 211, and a thin film transistor (TFT) is formed at an intersection of the gate lines and the data lines. Can be. Color filters may be formed on the upper substrate 212. The structure of the display panel 210 is not limited thereto, and the display panel 210 may have various structures. For another example, the lower substrate 211 may include not only a thin film transistor but also a color filter. In addition, the display panel 210 may be formed in various shapes according to a method of driving the liquid crystal layer.

Although not shown, a gate driving printed circuit board (PCB) for supplying a scan signal to a gate line and a data driving printed circuit board (PCB) for supplying a data signal to a data line are provided at edges of the display panel 210. ) May be provided.

A polarizing film (not shown) may be disposed on at least one of the top and bottom of the display panel 210.

An optical sheet 220 may be disposed between the display panel 210 and the backlight unit 100. In addition, the optical sheet 220 may be removed, but is not limited thereto. In addition, the optical sheet 220 may include a diffusion sheet (not shown) and / or a prism sheet (not shown).

In FIG. 2, the optical sheet 220 is spaced apart from the backlight unit 100, but the optical sheet 220 and the backlight unit 100 may be disposed in close contact with each other. At least a portion of the sheet 220 may contact the backlight unit 100.

The diffusion sheet evenly spreads the light emitted from the light guide plate, and the diffused light may be focused onto the display panel by the prism sheet. Here, the prism sheet may be selectively configured using a horizontal or / and vertical prism sheet, one or more roughness reinforcing films, and the like. Type or number of the optical sheets 220 may be added or deleted within the technical scope of the embodiment, but is not limited thereto.

Meanwhile, the backlight unit 100 includes a plurality of optical assemblies 10 forming a plurality of divided driving regions. In addition, the display panel 210 may be divided into a plurality of divided regions corresponding to each of the optical assemblies 10, and the optical assembly 10 according to the gray peak value or the color coordinate signal of the divided region. The brightness of the display panel 210 can be adjusted.

Hereinafter, the configuration of the backlight unit 100 will be described in detail.

3 is a plan view of a backlight unit according to an embodiment.

Referring to FIG. 3, the plurality of optical assemblies 10 included in the backlight unit 100 may be arranged in a matrix form with N and M (N, M being one or more natural numbers) in the x and y axis directions, respectively. Can be.

The optical assemblies 10 may be disposed to overlap a predetermined area with each other.

The optical assembly 10 may define a first region A and a second region B on a plane. The light source 13, the first part 15b, and the side cover 20 may be disposed in the first area A. FIG. The second region B emits the light provided from the first region to the front side. The first region A may be disposed below the second region B of the optical assembly 10 disposed nearby.

The plurality of optical assemblies 10 may be disposed such that the first regions A overlap each other and are not observed on a plane. However, the first regions A of the optical assemblies 10 disposed at one edge of the backlight unit 100 may be exposed on a plane without overlapping. The second regions B may be provided in close proximity to the front / rear boundary and the left / right boundary.

Each optical assembly 10 is driven in an edge type backlight method, and each optical assembly 10 again acts as a light source to form a backlight unit by arranging a plurality of optical assemblies 10 in a direct type backlight mode. can do. Therefore, the problem of the light emitting diodes being observed as a hot spot on the screen can be solved, and the thickness of the light guide plate can be reduced and the number of optical films can be reduced, thereby making the backlight unit slim.

For example, in the backlight unit 100 of FIG. 1, nine optical assemblies M1 to M9 may be arranged in a 3 × 3 arrangement.

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

The backlight unit 100 according to the embodiment may be driven in a full driving manner or a partial driving scheme such as local dimming or impulsive. The driving method of the light emitting diode 11 may be variously changed according to a circuit design, but is not limited thereto. As a result, the color contrast ratio is increased and the image of the bright and dark portions on the screen can be clearly expressed, thereby improving image quality.

That is, the backlight unit 100 is operated by being divided into a plurality of divided driving regions, and the luminance of the divided driving region is related to the luminance of the image signal so that the black portion of the image decreases the brightness and the bright portion increases the brightness. By doing so, the contrast ratio and the sharpness can be improved.

When the backlight unit 100 is driven by a local dimming method, the display panel has a plurality of divided regions corresponding to the optical assemblies, and according to the optical assembly according to the peak value or the color coordinate signal of the gray level of the divided regions. You can adjust the brightness.

For example, only the optical assembly M5 can be driven independently and diverged.

The backlight unit 100 according to the embodiment reduces the power consumption by applying a partial driving method, thereby reducing the cost.

In addition, the backlight unit 100 according to the embodiment may simplify the process of manufacturing the backlight unit 100 by assembling the optical assemblies 10 and may improve productivity by minimizing losses that may occur during the assembly process. Can be. In addition, it is possible to reduce the occurrence of defects due to the light guide plate scratch, etc., which may occur in the assembly process of the backlight unit 100 and to improve the optical mura, thereby improving process reliability and improving quality.

The backlight unit 100 according to the embodiment has an effect that can be applied to backlight units of various sizes by standardizing the optical assembly 10 to mass production.

When a failure occurs in any one of the optical assemblies 10 of the backlight unit 100 according to the embodiment, the replacement operation is easy because only the optical assembly in which the failure occurs is replaced, instead of replacing the entire backlight unit 100. The cost of replacing parts is reduced.

The optical assembly 10 and the backlight unit 100 having the same according to the embodiment have a strong and durable effect against impact or environmental changes from the outside.

The backlight unit 100 according to the embodiment can be easily applied to a large display panel. In addition, the embodiment has an advantageous effect in slimming the backlight unit and the display module.

4 is a cross-sectional view of the backlight unit of FIG. 1 taken along line II ′ of FIG. 1, and FIG. 5 is a perspective view of FIG. 4. 6 to 8 are perspective views illustrating respective parts of the optical assembly according to the embodiment.

4 to 6, the optical assembly 10 according to the embodiment is configured to fix the light source 13, the light guide plate 15 and the reflective member 17, the light source 13 and the light guide plate 15. And a side cover 20. The side cover 20 provides a fixed position with respect to the bottom cover 110 and includes a first side cover 21 and a second side cover 22. In addition, the light guide plate 15 includes a diffusion plate 221.

The light guide plate 15 includes a first part 15b and a second part 15a. In addition, the second part 15a may be formed of four side surfaces, a top surface on which a surface light source is generated, and a bottom surface facing the top surface.

The first part 15b may be formed to protrude in a horizontal direction along a lower side of one of the side surfaces of the second part 15a. Here, the first part 15b is a light incident part through which light is incident from the light source, and a side surface facing the first part may be referred to as a light facing part. In addition, a portion of the light guide plate 15 that substantially provides light to the panel may be referred to as a light emitting portion.

A scattering pattern (not shown) may be formed on the top or bottom surface of the light guide plate 15. The scattering pattern has a predetermined pattern and diffuses the incident light to improve light uniformity on the entire surface of the light guide plate 15.

Since the lower surface of the light guide plate 15 is formed to be inclined at a predetermined angle toward the light guide part from the first part 15b, the thickness of the light guide plate 15 may gradually become thinner toward the light guide part from the first part 15b. .

The lower surface of the light guide plate 15 may be provided with a reflective member 17. The reflective member 17 allows the light incident to the side through the first part 15b to be guided in the light guide plate 15 to be reflected by the reflective member 17 and then emitted to the upper surface.

In addition, the reflective member 17 may serve to block interference by light generated from another optical assembly 10 disposed in an overlapping manner.

The first part 15b may have a structure protruding along a lower side of the light guide plate 15.

The first part 15b further includes a protrusion 30 protruding from the upper surface to a predetermined height a. The protrusions 30 may be formed in at least two places in the x-axis direction on the upper surface of the first part 15b.

The protrusion 30 may have various shapes, for example, may have a shape similar to a cuboid. The protrusion 30 may be caught by the first side cover 21 to prevent shaking of the light guide plate 15 along the x-axis and the y-axis.

Some of the corners 30a of the protrusions 30 may be rounded to prevent cracks in the protrusions due to the impact applied to the protrusions 30 by the movement of the light guide plate 15. .

The protrusion 30 may have a height a of 0.3 mm to 0.6 mm from an upper surface of the first part 15b. Width b on the x-axis of the protrusion 30 may be 2 ~ 5mm. Width c on the y-axis of the protrusion 30 may be 1 ~ 3mm.

The protrusion 30 may be disposed between adjacent light emitting diodes 11. In addition, the protrusion 30 may be formed to be close to the light incident surface 16 on the upper surface of the first part 15b. This is to prevent optical interference caused by the projections 30 integrally formed with the light guide plate 15 from the light generated by the light emitting diodes 11.

The positional relationship between the light emitting diodes 11 and the protrusions 30 formed on the upper surface of the first part 15b of the light guide plate 15 and the size of the protrusions 30 are not limited thereto. And may have various positional relationships depending on the product family.

The light guide plate 15 may be made of a transparent material, and may include, for example, one of an acrylic resin series such as polymethyl metaacrylate (PMMA), polyethylene terephthlate (PET), poly carbonate (PC), and polyethylene naphthalate (PEN) resin. Can be. The light guide plate 15 may be formed by an extrusion molding method.

Meanwhile, since the plurality of optical assemblies 10 are used in the backlight unit 100 according to the embodiment, minute gaps may be formed in the boundary region between the light guide plate 15 and the light guide plate 15, and the minute gaps may be formed. Because of this, light leaks out. Accordingly, a bright line or a dark line is visible in the boundary region between the light guide plate 15 and the light guide plate 15, and thus, a bright line or dark line in a lattice form can be observed when viewed from the front side.

The non-uniform luminance distribution caused by the bright and dark lines may degrade the quality of the displayed image.

Therefore, in the backlight unit 100 according to the exemplary embodiment, the diffusion plate 221 is disposed on the light guide plate 15, and the diffusion plate corresponding to the boundary area between the light guide plate 15 and the light guide plate 15 is formed. The diffusion pattern part 223 is formed in the 221 to minimize the bright or dark lines in the boundary area between the light guide plate 15 and the light guide plate 15.

The diffusion pattern part 223 has a light diffusing function that is further enhanced than other portions of the diffusion plate 221 by additionally forming a diffusion material in the diffusion plate 221. Thus, the light guide plate 15 and the light guide plate The bright line or dark line in the boundary region between 15 can be reduced.

The diffusion pattern part 223 may be formed of the same material as the diffusion plate 221 or may be formed of a material different from that of the diffusion plate 221. The diffusion pattern part 223 may provide a diffusion force greater than that of the diffusion plate 221.

For example, the diffusion pattern part 223 may be a pattern formed in the diffusion pattern part 223 by a printing method.

The diffusion pattern part 223 of the diffusion plate 221 may be formed of a high diffusion material including a micro ball to help diffuse light. The high diffusion material promotes light diffusion more than the diffusion plate 221. For example, the high diffusion material may be formed of a silicon material containing micro balls, for example, the micro balls may include fine particles including at least one of materials such as TiO ₂ , SiO ₂ , and CaCO _3. Can be

The diffusion plate 221 may be formed in close contact with the light guide plate 15, or may be formed spaced apart from a predetermined interval.

As shown in FIG. 12, the diffusion pattern part 223 of the diffusion plate 221 may be disposed in a lattice form according to the shape in which the light guide plate 15 is disposed, and the light guide plate 15 and the light guide plate 15 may be disposed. Is formed in correspondence with the boundary region between them. The diffusion pattern part 223 of the diffusion plate 221 is disposed to overlap the boundary area between the light guide plate 15 and the light guide plate 15 in a vertical direction.

As the diffusion plate 221 having the diffusion pattern portion 223 is formed, luminance unevenness due to bright or dark lines generated in the boundary region between the light guide plate 15 and the light guide plate 15 may be alleviated and light uniformity may be reduced. It is effective to secure sex

4 and 7, the light source 13 may include at least one light emitting diode 11 and a module substrate 12 on which the light emitting diode 11 is mounted.

The light emitting diodes 11 may be arranged on the module substrate 12 in the x-axis direction and disposed close to the light incident surface 16 of the first part 15b.

The module substrate 12 is made of a metal core PCB, FR-4 PCB, a general PCB, a flexible substrate, and the like, and can be variously changed within the technical scope of the embodiment.

A thermal pad (not shown) may be disposed under the module substrate 12. The heat dissipation member may be formed between the module substrate 12 and the second side cover 22.

The light emitting diode 11 may be a side light emitting type, and the light emitting diode 11 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 11 may be changed within the technical scope of the embodiment.

The light generated by the light emitting diodes 11 is incident sideways to the first part 15b. Light incident from the light emitting diodes 11 may be mixed in the light guide plate 15 including the first part 15b.

Light incident from the light emitting diodes 11 is guided in the first part 15b to be incident to the second part 15a. The light incident on the second part 15a is reflected by the reflecting member 17 on the lower surface and emitted to the upper surface. In this case, since light is scattered and diffused by the scattering pattern formed on the lower surface of the light guide plate 15, light uniformity may be improved.

The light emitting diodes 11 may be disposed on the module substrate 12 at predetermined intervals. The light emitting diode 11 may be disposed in an oblique direction with respect to the protrusion 30 in order to minimize the optical effect of the protrusion 30 formed on the light guide plate 15. Thus, the spacing of the light emitting diodes 11 around the protrusion 30 may be wider than the spacing of other light emitting diodes 11.

In order to secure a space for coupling the first side cover 21 and the second side cover 22 and to minimize an optical effect that may be generated by the light guide plate 15 being pressed by the coupling force, the light emitting diode 11 The spacing of some of the light emitting diodes 11 may be wider than the spacing of other light emitting diodes 11.

For example, if the first spacing d of the adjacent light emitting diodes 11 is about 10 mm, the second spacing e of the light emitting diodes 11 near the position where a space for coupling is provided may be about 13 mm. .

Light generated by the light emitting diodes 11 may be mixed in the light guide plate 15 including the first part 15b and uniformly provided to the second part 15a.

4 and 8, the side cover 20 is formed to surround a portion of the light source 13 and the light guide plate 15.

The side cover 20 includes a first side cover 21 disposed above the light source 13 and the first part 15b and a second side cover disposed below the first part 15b. (22).

The side cover 20 may be made of plastic or metal.

The first side cover 21 is formed to face the top surface of the first part 15b. The first side cover 21 may be bent in a downward direction (z-axis line) to face the light incident surface 16 on an upper surface of the first part 15b.

The second side cover 22 is formed to face the lower surface of the first part 15b. The second side cover 22 may be bent in an upward direction (z-axis line) to face the light incident surface 16 at a lower surface of the first part 15b. A part 22a of the second side cover 22 may be formed to be inclined along a lower surface of the light guide plate 15, that is, a part of the inclined surface, and the light source 13 may be accommodated in the second side cover 22. Can be.

The first side cover 21 and the second side cover 22 are fastened to each other by the first fixing member 51 such that the light source 13 and the light guide plate 15 do not shake to an external impact, in particular, z The shaking in the axial direction can be prevented.

The second side cover 22 may support the inclined surface of the light guide plate 15 to maintain the alignment of the light guide plate 15 and the light source 13 firmly and protect from external impact.

The first side cover 21 may have a first hole 41 formed at a position corresponding to the protrusion 30 of the first part 15b.

The first hole 41 may be larger than the protrusion 30 so that the protrusion 30 is fitted into the hook. The circumference of the first hole 41 may be spaced apart from a predetermined edge of the fitting protrusion 30 by a predetermined distance, and the space is spaced apart by the light guide plate 15 due to a change in external environment, for example, a sudden temperature rise. It may be a margin for preventing deformation of the light guide plate 15. In this case, another portion of the protrusion 30 may contact the circumference of the first hole to strengthen the fixing force.

At least one second hole 42 may be further formed in the first side cover 21.

At least one third hole 43 may be formed in the second side cover 21 at a position corresponding to the second hole 42.

The second and third holes 42 and 43 may be disposed in a straight line in the z-axis direction, and a first fixing member 51 may be inserted into the first side cover 21 and the second side cover 22. Can be fixed firmly. In order to secure a fixing force, at least two pairs of the second and third holes 42 and 43 may be formed in one optical assembly 10. The second hole 42 and the third hole 43 may be formed at any position of the first side cover 21 and the second side cover 22, respectively.

In the first side cover 21, the second hole 42 may be disposed on a straight line in the y-axis direction with the first hole 41. In this case, the coupling force between the light guide plate 15 and the first side cover 21 by the protrusion 30 of the first hole 41 and the light guide plate 15, the second and third holes 42 and 43, and the The first side cover 21 and the second side cover 22 are more firmly fixed by the coupling force between the first side cover 21 and the second side cover 22 by the first fixing member 51. May be Of course, the positions of the holes and the protrusions are not limited thereto, and any position may be used as long as the position of the holes and the protrusions may provide a coupling force between the light guide plate 15 and the side cover 20. That is, the second hole and the third hole are respectively formed in the side portion overlapping the first side cover 21 and the second side cover 22, it will be said that the configuration in which the fixing member is inserted in the y-axis direction is also possible. .

Meanwhile, a second fixing member 52 (see FIG. 10) through which the optical assembly 10 is fixed to the bottom cover 110 passes through the first side cover 21 and the second side cover 22. The fourth hole 44 and the fifth hole 45 may be further formed.

The remaining part of the optical assembly 10 except for the second part 15a of the light guide plate 15 is a first area that does not substantially provide light to the display panel. The first hole 41 and the second hole ( By the arrangement relationship between the 42 and the third hole 43, the width of the first region may be further reduced.

For example, when the second hole 42 and the third hole 43 are disposed between the light emitting diodes 11, the second hole 42 and the third hole 43 may be disposed between the light emitting diodes 11. The width can be reduced.

Here, the shape of the first hole 41, the second hole 42 and the third hole 43 formed in the side cover 20 of the optical assembly 10 may be various, limited to the illustrated form It doesn't happen.

The first fixing member 51 may be a screw or a fixing pin, but is not limited thereto.

When the first fixing member 51 is a screw, peaks and valleys are formed on the inner surfaces of the second and third holes 42 and 43 along the screw line. As a result, the first fixing member 51 is rotated by being fitted into the second hole 42 and the third hole 43, thereby clamping the light guide plate 15 and the light source 13 sandwiched therebetween.

The first and second side covers 21 and 22 may include the second hole 42 and the first to secure the pitch of the peaks formed in the inner surfaces of the second hole 42 and the third hole 43. The thickness around the three holes 43 may be formed thicker than other portions, or a separate member may be used.

The backlight unit 100 manufactured as described above may be accommodated in a box-shaped bottom cover having an upper surface opened.

9 is a plan view illustrating a backlight unit accommodated in a bottom cover according to an embodiment, and FIG. 10 is a cross-sectional view taken along the line II-II ′ of FIG. 9. 11 is a perspective view illustrating a state in which one optical assembly is accommodated in the backlight unit according to the embodiment.

9 to 11, the same parts as those of FIGS. 1 to 8 will be referred to the above description, and redundant descriptions will be omitted.

As shown in FIG. 9, the backlight unit 100 is disposed inside the box-shaped bottom cover 110 having an upper surface opened.

The bottom cover 110 may be made of a metal material or a plastic material.

The backlight unit 100 may be easily assembled by inserting the optical assembly 10 into the bottom cover 110 in a vertical direction.

The optical assemblies 10 mounted on the bottom surface of the bottom cover 110 may be fixed in position by being bitten by the bottom cover 110 by the second fixing member 52.

The second fixing member 52 is disposed in the second side cover 22 corresponding to the fourth hole 44 and the fourth hole 44 formed in the first side cover 21 of the optical assembly 10. The fifth hole 45 and the bottom cover 110 may be coupled to each other through the sixth hole 46 formed corresponding to the fourth and fifth holes 44 and 45.

At least one pair of the fourth and fifth holes 44 and 45 may be formed in one optical assembly 10.

The second fixing member 52 may couple the optical assembly 10 to the bottom cover 110 in a manner similar to that of the first fixing member 51 described above, but is not limited thereto.

In addition, although the fourth and fifth holes 44 and 45 are not formed in the side cover 20, the first fixing member 51 is coupled to the sixth hole 46 of the bottom cover 110. The optical assembly 10 may be fixed to the bottom cover 110.

Meanwhile, an additional hole may be further formed in the side cover 20 to allow a cable connecting the light source 13 to a control unit such as a main controller to pass therethrough.

As shown in FIGS. 10, 11, and 14, the backlight unit 100 is disposed on the bottom surface of the bottom cover 110, and each optical assembly 10 is formed by the second fixing member 52. The bottom cover 110 is fixed to the bite.

The optical assembly 10 has a flat top surface and an inclined back surface according to the shape of the light guide plate 15. The bottom surface of the bottom cover 110 on which the optical assembly 10 is mounted may be formed in a concave-convex structure along the rear shape of the optical assembly 10.

For example, a structure including a light source 13, a first part 15b of the light guide plate 15, and a side cover 20 may be disposed on the recess 110a of the bottom surface. The second part 15a of the light guide plate 15 may be disposed on the convex portion 110b. The concave portion 110a and the convex portion 110b may be alternately disposed continuously.

The bottom cover 110 of such a shape may be manufactured using a process such as press molding or extrusion molding.

The shape of the concave portion 110a and the convex portion 110b depends on the size and appearance of the optical assembly 10, and the inclination angle of the lower surface of the light guide plate 15 as well as the accommodation of the optical assembly 10 is To be maintained.

In addition, the bottom cover 110 having a bottom surface formed of a concave-convex structure as in the embodiment may be advantageous in maintaining its shape and maintaining rigidity.

In recent years, the size of the panel increases, and accordingly, the size of the backlight unit that provides light to the panel increases, and according to the embodiment, it is not necessary to provide a separate structure and means around the outer edge to maintain the shape of the bottom cover. Therefore, the assembly of the backlight unit and the display module can be easily simplified. In addition, the weight of the backlight unit and the display module may be reduced, and the bezel size may be reduced.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

The present invention has been described above with reference to preferred embodiments thereof, which are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains do not depart from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not possible that are not illustrated above. For example, each component shown in detail in the embodiment of the present invention may be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is an exploded perspective view of a display device according to an embodiment;

FIG. 2 is a cross-sectional view of the display module taken along the line AA of FIG. 1.

3 is a plan view of a backlight unit according to the embodiment;

4 is a cross-sectional view of the backlight unit according to the II ′ diagram of FIG. 1.

5 is a perspective view of FIG. 4.

6 to 8 are perspective views showing respective parts of the optical assembly according to the embodiment.

9 is a plan view illustrating a backlight unit accommodated in a bottom cover according to an embodiment.

10 is a cross-sectional view taken along the line II-II ′ of FIG. 9.

11 is a perspective view illustrating a state in which one optical assembly is accommodated in the backlight unit according to the embodiment.

12 is a plan view illustrating an example in which a diffusion pattern portion is disposed on a diffusion plate in a backlight unit according to an embodiment;

Claims (14)

And a light guide plate including a light source for generating light, a side cover surrounding the light source, a second part of which a thickness of a cross section decreases from one side to another side, and a first part protruding from the one side. An optical assembly having a first coupling portion formed on an upper surface of the part, and a second coupling portion corresponding to the first coupling portion formed on the side cover to couple the light guide plate to the side cover; A diffuser plate on the optical assembly; And And a bottom cover accommodating the optical assembly. And a light guide plate including a light source for generating light, a side cover surrounding the light source, a second part having a thickness of a cross section decreasing from one side to the other side, and a first part protruding from the one side. A first coupling part is formed on an upper surface of the part, and a second coupling part corresponding to the first coupling part is formed on the side cover, and at least two or more optical assemblies to which the light guide plate and the side cover are coupled are arranged side by side. The other side of the light guide plate included in any one of the optical assemblies comprises: a plurality of optical assemblies disposed to be positioned on a first part of the light guide plate included in the adjacent optical assembly; A diffuser plate on the plurality of optical assemblies; And And a bottom cover accommodating the optical assembly. The backlight unit of claim 1, wherein a reflective member is provided on a lower surface of the light guide plate. The backlight unit of claim 1, wherein the first coupling part is formed of a protrusion, and the second coupling part is formed of a hole. The backlight unit of claim 1, wherein the diffusion plate comprises a pattern portion formed at a boundary area between the light guide plates included in the plurality of optical assemblies. The backlight unit of claim 5, wherein the pattern part is formed of a silicon material including micro balls. The backlight unit of claim 5, wherein the plurality of optical assemblies are disposed in a matrix and the pattern portion is disposed in a grid. And a light guide plate including a light source for generating light, a side cover surrounding the light source, a second part having a thickness of a cross section decreasing from one side to the other side, and a first part protruding from the one side. An optical assembly having a first coupling portion formed on an upper surface of the part, and a second coupling portion corresponding to the first coupling portion formed on the side cover to couple the light guide plate to the side cover; A diffuser plate on the optical assembly; And a bottom cover to receive the optical assembly. And And a display panel on the backlight unit. And a light guide plate including a light source for generating light, a side cover surrounding the light source, a second part having a thickness of a cross section decreasing from one side to the other side, and a first part protruding from the one side. A first coupling part is formed on an upper surface of the part, and a second coupling part corresponding to the first coupling part is formed on the side cover, and at least two or more optical assemblies to which the light guide plate and the side cover are coupled are arranged side by side. The other side of the light guide plate included in any one of the optical assemblies comprises: a plurality of optical assemblies disposed to be positioned on a first part of the light guide plate included in the adjacent optical assembly; A diffuser plate on the plurality of optical assemblies; And a bottom cover to receive the optical assembly. And a display panel on the plurality of optical assemblies. The display apparatus of claim 8 or 9, further comprising a reflective member on a lower surface of the light guide plate. The display apparatus of claim 8 or 9, wherein the first coupling part is formed of a protrusion, and the second coupling part is formed of a hole. The display apparatus of claim 8, wherein the diffusion plate comprises a pattern portion formed at a boundary area between light guide plates included in the plurality of optical assemblies. The display device of claim 12, wherein the pattern part is formed of a silicon material including micro balls. The display apparatus of claim 12, wherein the plurality of optical assemblies are disposed in a matrix and the pattern portion is disposed in a grid.

Images