KR20110102091A - Optical assembly, backlight unit having the same, and display apparatus thereof - Google Patents

Abstract

This embodiment relates to a display device.
The optical assembly according to the present embodiment includes a substrate; A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction; A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is projected in a second direction crossing the first direction and one side of which is connected to the light incident part Light guide plate comprising; And a cover surrounding at least a portion of the light guide plate, the substrate, and the light source, wherein the light guide plate is formed with a plurality of optical units for scattering the incident light in a plurality of directions.

Description

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

This embodiment relates to a display device.

In general, a display device is a device on which an image is displayed. Recently, a plurality of flat panel display apparatuses capable of being shaped in a two-dimensional display apparatus have been released.

The display device includes a display module for displaying an image and a front cover and a back cover provided at the front and rear of the display module to protect the display module.

The display module generally includes a display panel on which an image is displayed, a backlight unit that provides light to the display panel, and includes a plurality of light sources.

An object of the present embodiment is to provide a display device and a backlight unit in which the thickness is reduced and the image quality is increased.

Another object of the present embodiment is to provide a backlight unit and a display device that provide light and are provided with a modular optical assembly, which is easy to manufacture.

Still another object of the present embodiment is to provide a backlight unit in which light emitted from a plurality of light sources is uniformly provided and a display device employing the backlight unit.

An optical assembly according to an aspect of the present embodiment is a substrate; A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction; A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is projected in a second direction crossing the first direction and one side of which is connected to the light incident part Light guide plate comprising; And a cover surrounding at least a portion of the light guide plate, the substrate, and the light source, wherein the light guide plate is formed with a plurality of optical units for scattering the incident light in a plurality of directions.

A backlight unit according to an aspect of the present embodiment includes a bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction; A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is emitted in a second direction crossing the first direction and one side of which is connected to the light incident part A plurality of light guide plate comprising; And a cover surrounding at least a portion of the light guide plate, the substrate, and the light source and fixed to the bottom cover, wherein the light guide plate is formed with a plurality of optical units for scattering the incident light in a plurality of directions.

A display device according to an aspect of the present embodiment, a display panel that displays an image;

A backlight unit positioned on a rear surface of the display panel and divided into a plurality of blocks and individually driving the plurality of blocks; A driving unit provided at a rear of the backlight unit to drive the display panel and / or the backlight unit, wherein the backlight unit comprises: a bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction; A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is emitted in a second direction crossing the first direction and one side of which is connected to the light incident part A plurality of light guide plate comprising; And a cover surrounding at least a portion of the light guide plate, the substrate, and the light source and fixed to the bottom cover, wherein the light guide plate is formed with a plurality of optical units for scattering the incident light in a plurality of directions.

According to the proposed embodiment, an optical assembly including a plurality of light sources, a light guide plate, and a cover is modularized and assembled to the bottom cover of the backlight unit, thereby simplifying the manufacturing process of the backlight unit and increasing manufacturing efficiency. There is this.

In addition, by providing light to the display panel by using a modular backlight unit including a plurality of light guide plates, the display device is reduced in thickness, and at the same time, partial driving such as local dimming or impulsive is performed. The contrast may be improved by using the scheme.

In addition, since a plurality of optical units are provided in the light guide plate, and the optical units are provided in different density patterns according to positions of relative regions in the light guide plate, there is an advantage that a luminance difference generated in the light guide plate can be reduced. .

1 is an exploded perspective view showing the configuration of a display device according to an embodiment of the present invention.
2 is a cross-sectional view showing a display module configuration according to the AA diagram of FIG.
Figure 3 is a plan view briefly showing the configuration of the backlight unit according to an embodiment of the present invention.
4 is a perspective view showing an optical assembly according to an embodiment of the present invention.
5 is an exploded perspective view of an optical assembly according to an embodiment of the present invention.
6 is a cross-sectional view taken along line BB of FIG. 4.
FIG. 7 is a view illustrating the light guide plate of FIG. 6. FIG.

Hereinafter, exemplary embodiments will be described in detail with reference to the accompanying drawings. However, the spirit of the present invention is not limited to such embodiments, and the spirit of the present invention may be proposed differently by the addition, change, deletion, etc. of the components constituting the embodiments, but this also applies to the spirit of the present invention. It is included.

1 is an exploded perspective view showing the configuration of a display device according to the present embodiment.

Referring to FIG. 1, the display device 1 according to the present 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. It includes a fixing member 500 for fixing to the front cover 300 and / or 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 then the other side supports the display module 200 with respect to the front cover 300 side, the front cover 300 ) May be fixed to the display module 200.

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

FIG. 2 is a cross-sectional view illustrating a display module configuration according to the A-A diagram of FIG. 1.

1 and 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 display module 200. The bottom cover 110 forming the lower 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 to form an edge of the display module 200. Top cover 230.

The bottom cover 110 may be formed in a box shape having an upper surface open 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, and thus the bottom cover 110 and the top cover 230 are disposed. Can be fixed

The bottom cover 110 is provided with at least one substrate 250 for driving the display module 200 by a signal input from the outside, for example, a video signal.

The substrate 250 may be, for example, a driver of an image panel and / or a backlight unit, such as a timing controller (T-con board) or a main PCB, and the substrate 250 may be formed of the bottom cover 110. On the back side, for example, it may be fixed by a fastening member such as a screw or an adhesive member.

In addition, a plurality of devices may be mounted on the substrate 250, and a plurality of cables 251 may be included to connect the devices of the substrate 250 to the optical assembly 10 of the backlight unit 100.

In addition, a cable through hole 111 through which the cable 251 penetrates may be formed in the bottom cover 110 forming the rear surface of the backlight unit 100.

Although the display panel 210 is not shown in detail, for example, the lower substrate 211 and the upper substrate 222 bonded to each other so as to maintain a uniform cell gap facing each other, and the interposed between the two substrates. It includes a liquid crystal layer. A plurality of gate lines and a plurality of data lines intersecting the plurality of gate lines may be formed on the lower substrate 211, and a thin film transistor (TFT) may be formed at an intersection of the gate lines and the data lines. have.

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. As 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 the gate line and a data driving printed circuit board (PCB) for supplying a data signal to the data line are provided at the edge of the display panel 210. It may be provided. Meanwhile, a polarizing film (not shown) may be disposed on at least one of the top and bottom of the display panel 210.

Meanwhile, the backlight unit 100 according to the present exemplary embodiment may include a plurality of optical assemblies including a light source 13, a substrate 14, a light guide plate 15, a reflective member 17, and a cover 18 and 19. 10) and an optical sheet 220 provided between the display panel 210.

The optical sheet 220 according to the present embodiment may be removed, but is not limited thereto. The optical sheet 220 may include a diffusion sheet (not shown) and / or a prism sheet (not shown).

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 optical sheets 220 may be added or deleted within the technical scope of the embodiment, but is not limited thereto.

On the other hand, a plurality of optical assemblies 10 are arranged, and are disposed below the display panel 210 and the optical sheet 220 to emit light upward and irradiate the light to the display panel 210.

The optical assembly 10 includes a light source 13 that emits light in a state having a predetermined direction angle about a first direction that is a y-axis direction, and a z-axis light emitted by the light source 13 in the first direction. And a light guide plate 15 for diffusing light in a second direction which is a direction.

In this case, the light guide plate 15 included in the optical assembly 10 may diffuse the light incident part 15b into which the light is incident in the first direction and the light incident into the light incident part 15b in the second direction. And a light emitting portion 15a.

The detailed configuration of the optical assembly 10 will be described later.

3 is a plan view briefly illustrating a configuration of a backlight unit.

2 and 3, the backlight unit 100 includes, for example, a plurality of light guide plates 15 (N being two or more) in the first direction, which is the y-axis direction, and the backlight unit 100. The plurality of light guide plates 15 (M is 2 or more) may be provided in a third direction, which is an x-axis direction intersecting the y-axis, on the plane to be formed.

At this time, the light emitting portion 15a of one of the light guide plates 15 of the light guide plate 15 arranged in the first direction is disposed above the light incident portion 15 of the other light guide plate 15. At least two light guide plates 15 adjacent to each other in a first direction may partially overlap each other.

That is, the other end of the light emitting portion 15a of the Kth (K is any one of 1 to N-1) of the N light guide plates is the light incident portion 15b of the K + 1th light guide plate. At least a portion of the at least two light guide plates 15 adjacent to each other may be provided in a state of overlapping each other.

In addition, the optical assemblies 10 adjacent to each other are disposed to be spaced apart from each other by a predetermined distance d2 and d1 to form a space having a predetermined size.

That is, the light emitting portions 15a of the two light guide plates 15 disposed in the first direction (y-axis direction), which are the central directions in which light is emitted from the light source 13, are adjacent to each other in the first direction. Spaced apart from each other at an interval d1.

In addition, the light guide plates 15 disposed in the third direction (x-axis direction) crossing the first direction and adjacent to each other are spaced apart from each other at a second spacing d2.

In this case, the plurality of first separation intervals d1 may be formed in a third direction (x-axis direction), and the plurality of second separation intervals d2 may be formed in a first direction (y-axis direction). The separation interval d1 and the second separation interval d2 intersect each other.

A bright line or a dark line may appear in the region 60 corresponding to the boundary portion at the boundary portion between the optical assemblies 10 and the light guide plate 15 adjacent to each other in the above-described distances d2 and d1.

That is, as the distances d1 and d2 between the light guide plates 15 adjacent to each other become narrower, the amount of light emitted to the front through the boundary portion increases, so that in the region 60 corresponding to the boundary portions between the light guide plates 15, As the brightness of the light increases, the bright line may appear, and thus, the bright line may be visually exposed on the display screen.

That is, as the distances d1 and d2 between the light guide plates 15 adjacent to each other become wider, the amount of light emitted to the front through the boundary portion decreases, and thus, in the region 60 corresponding to the boundary portion between the light guide plates 15. As the luminance of light decreases, dark lines may appear.

Therefore, according to the exemplary embodiment of the present invention, the distances d1 and d2 between the light guide plates 15 adjacent to each other are in a numerical range where no bright lines or dark lines appear at the boundary, that is, the first spaced distance d1 is, for example, 0.1. In a size between mm and 7 mm, the second separation distance d2 may be formed in a size between 0.1 mm and 7 mm, for example.

In addition, at least a portion of the reflective member 17 of the light guide plate 15 of the two light guide plates 15 adjacent to each other is positioned in the spaced space, and an inner surface of the bottom cover 110 is formed through the spaced space. Exposure to the first direction (y-axis direction) is prevented.

Meanwhile, in the display device 1 according to the exemplary embodiment, three optical assemblies 10 are disposed in the first direction, and three optical assemblies 10 are disposed in the third direction. A backlight unit 100 that satisfies the light guide plate arrangement condition is described.

The optical assemblies 10 can be fabricated as independent assemblies and can be placed in close proximity to form a modular backlight unit. Such a modular backlight unit may provide light to the display panel 210 as a backlight means.

The backlight unit 100 may be driven by a full driving method or a partial driving method such as local dimming or impulsive. That is, the backlight unit 100 is divided into a plurality of divided driving regions corresponding to the plurality of light guide plates 15, and each of the divided driving regions corresponds to a luminance or color coordinate signal of an image signal input to the display panel 210. Therefore, the brightness can be adjusted. Similarly, the display panel 210 is also divided according to the division driving area.

The driving method of the light emitting diode 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 corresponding to the plurality of light guide plates 15, and the black portion of the image is luminance by linking the luminance of the divided driving regions with the luminance of the image signal. By reducing the brightness and increasing the brightness, brightness and contrast can be improved.

Meanwhile, an area of the display panel 210 corresponding to one optical assembly 10 or one light guide plate 15 may be divided into two or more blocks, and the display panel 210 and the backlight unit may be divided into blocks. Can be driven.

At this time, the light guide plate 15 of the optical assembly 10 of C1 to C3 is disposed in the central column C in the backlight unit 100, and the left and right columns L and R are centered around the central column C. The light guide plates 15 of L1 to L3 and the light guide plates 15 of R1 to R3 are disposed respectively.

In more detail, as described above, nine light guide plates 15 may be arranged in three rows and three columns in the backlight unit 100 according to the present exemplary embodiment. In addition, a reflecting member 17 is disposed below each of the light guide plates 15 so that light incident on the light guide plate 15 in the first direction may cross in the second direction (z-axis direction). Allow light to be emitted.

In this case, at least a portion of the reflective member 17 disposed on the light guide plate 15 of the optical assembly 10 of C1 to C3 disposed in the central column C is further extended toward the outer edge of the light guide plate 15. . In addition, an extended portion of the reflective member 17 positioned on the center row C overlaps the reflective member 17 located on the left row L and the right row R side.

4 is a perspective view showing an optical assembly according to the present embodiment, and FIG. 5 is an exploded perspective view of the optical assembly according to the present embodiment. 6 is a cross-sectional view taken along line B-B of FIG. 4.

4 to 6, the optical assembly 10 of the display apparatus 1 according to the present exemplary embodiment may be arranged at least partially fixed to the bottom cover 110.

The optical assembly 10 includes a substrate 14 and a plurality of light sources 13 arranged on the substrate 14 to emit light with a predetermined direction angle θ about the first direction (y-axis direction). ), A light incidence portion 15b including an incident surface 151 through which light is incident from the light sources 13 in a first direction, and a second direction in which the incident light intersects the first direction (z-axis). Direction) and one side of the light guide plate 15 including a light emitting unit 15a connected to the light receiving unit 15b, at least a portion of the light guide plate 15, the substrate and the light source, and the light guide plate 15 and Covers 18 and 19 for fixing the light source 13.

In more detail, at this time, the light source 13 may be configured to include a light emitting diode (LED) or a plurality of light emitting diodes (LEDs).

The light emitting diode may be a side light emitting type for irradiating light to the side. It may be implemented as a colored LED emitting at least one of colors such as red, blue, and green, or an LED emitting yellow light by applying a yellow phosphor to the blue LED.

The light emitting diodes may be disposed on the substrate 14 and may be provided as light emitting diodes emitting light having a wavelength between 430 nm and 480 nm, and the light emitting diodes may emit light emitted from the light emitting diodes. The phosphor coated to pass therethrough may be provided.

The colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of such a light emitting diode may be changed within the technical scope of the embodiment.

In addition, the light sources 13 according to the present exemplary embodiment emit light with a predetermined direction angle θ around the first direction.

The plurality of light sources 13 are disposed in the substrate body 141 of the substrate 14 extending in a direction parallel to the third direction (x-axis direction), and the first direction y of the substrate body 141. Axially rearwardly centered position.

That is, the light source 13 is mounted in the rear region based on the first direction of the substrate body 141, and the front region is formed at the front side of the rear region k2, and the size of the front region is the rear region. It may be formed larger than the size of.

It is necessary to secure a support space of a predetermined size in which the at least a portion of the light guide plate 15 and the reflective member 17 can be supported in the front region, and only the width in which the light source 13 can be mounted is secured in the rear region. This is because the width of the rear region should be reduced to a minimum because the width of the bezel region of the display module where the rear region k2 is located, that is, the edge of the display module, may decrease as the size decreases.

In this case, the first direction (y-axis direction) may be referred to as a front-rear direction with respect to the light guide plate 15, and the third direction (x-axis direction) may be referred to as a left-right direction with respect to the light guide plate 15. In addition, in the front-rear direction, the front means a direction (+ y-axis direction) in which light is incident from the light source 13 to the light guide plate 15, and the rear means an opposite direction (-y-axis direction) of the front side.

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), polycarbonate (PC), and polyethylene naphthalate (PEN) resin. have. The light guide plate 15 may be formed by an extrusion molding method.

The light guide plate 15 scatters the light incident from the light source 13 and guides the light to emit light upward.

The light guide plate 15 refracts and scatters light incident from the light source 13 in front (y-axis direction), that is, side-side incident light, and emits light in an upward direction (z-axis direction), that is, in the direction of the display panel 210. The bottom surface of the light guide plate 15 may be inclined upward toward the front to efficiently emit light incident from the side.

The covers 18 and 19 are connected to the first cover 18 and the first cover 18 on which at least a portion of the upper surface of the light guide plate 15 is supported, and the second cover on which at least a portion of the lower surface of the light guide plate 15 is supported. Cover 19. On the inner surface of the second cover 19 is mounted a substrate 14 on which a plurality of light sources 13 are mounted.

In addition, a fastening member such as a screw penetrates through the first cover 18 and the second cover 19 to fix the first cover 18, the second cover 19, and the substrate 14 integrally. . In this case, when the first cover 18 and the second cover 19 are fixed, at least a part of the light guide plate 15 is sandwiched between the first cover 18 and the second cover 19, so that the light guide plate 15, Coupling between the substrate 14 and the light sources 13 may be performed.

In addition, the first cover 18 is formed to be bent with respect to the first region 181 and the first region 181, the inner surface of which is in contact with the upper surface 152 of the light incident part, and one side thereof is in contact with the second cover 19. The second area 182 is included.

In this case, the distance between the inner surface of the second region 182 and the inner surface of the second cover 19 is smaller than the distance between the inner surface of the first region 181 and the inner surface of the second cover 19.

In addition, the fastening member 70 penetrates through the first cover 18, the reflective member 17, the substrate 14, and the second cover 19 of the optical assembly 10 according to the present exemplary embodiment, respectively. A first cover side through hole 185, a reflective member side through hole, a substrate side through hole 145, and a second cover side through hole may be formed to fix the elements to each other.

The light guide plate 15, the light source unit substrate 14, the light sources 13, and the substrates 18 and 19 are fixed to each other so that one optical assembly 10 is assembled and then the plurality of optical assemblies 10 are As shown in FIG. 3, the bottom cover 110 is fixed to the bottom cover 110. In this case, the covers 18 and 19 provided on one side of the optical assembly 10 are fixed to the bottom cover 110, so that the fixing of the optical assembly 10 to the bottom cover 110 may be performed.

Meanwhile, light emitted from the plurality of light sources 13 is incident on the light incident part 15b of the light guide plate 15, and light emitted from the plurality of light sources 13 formed as point light sources passes through the light incident part 15b. The light is mixed with the surface light source and emitted in the second direction (z-axis direction) through one surface of the light emitting part 15a.

Hereinafter, the configuration of the light guide plate 15 will be described in detail.

FIG. 7 is a cross-sectional view taken along the C-C diagram of FIG. 6.

6 and 7, the bottom surface 154 of the light guide plate 15 according to the present embodiment is formed to be inclined toward the second direction (z-axis direction), and the top surfaces 152 and 153 of the light guide plate 15 are formed. Is formed in a shape in which a step of a predetermined size is formed. In addition, a plurality of optical units 155 are disposed at a portion of the light guide plate 15 corresponding to the light emitting portion 15b of the bottom surface 153.

In more detail, a light incident surface 151 through which light emitted from the light source 13 is incident is formed at one side of the light incident portion 15b of the light guide plate 15, and the other side of the light incident portion 15b and the light emitting portion 15a are formed. One side is connected to each other.

The light incident part 15b and the light emitting part 15b are formed to extend in the first direction (y-axis direction), respectively, by predetermined distances L1 and L2 of a predetermined size, and the light incident part 15b and the light emitting part are respectively formed. The extension distance L3 of the light guide plate 15 is determined by the sum of the extension distances L1 and L2 of 15b.

On the other hand, the upper surface of the upper surface 152 of the light incident portion 15b and the upper surface 153 of the light emitting portion 15b are formed at different heights, so that the upper surface 152 of the light incident portion 15b and the light emitting portion 15b A step is formed between the upper surfaces 153 according to the height difference between the upper surfaces 152 and 153.

The inner surface of the first region 181 of the first cover 18 is in contact with the upper surface 152 of the light incident part 15b, and at least a part of the bottom 154 of the light guide plate 15 is the second cover 19. Is supported on the inner surface of the

In this case, the upper surface 152 of the light incidence portion 15b that the upper surface 353 of the light emitting portion 15a and the inner surface of the first cover 18 that emit light may be referred to as one surface of the light guide plate 15. The bottom surface 154 of the light guide plate 15 formed may be referred to as the rear surface of the light guide plate 15.

On the other hand, the light incident on the light incidence portion 15b of the light guide plate 15 is mixed from the point light source to the surface light source and inserted into the light emitting portion 15a, so that the upper surface 153 and the light incidence portion of the light emitting portion 15b. Due to the step between the top surface 152 of 15b, light is not transmitted smoothly to some areas of the light emitting part 15b adjacent to the step, so that darker dark areas are formed than other areas.

The dark portion is formed in a portion of the region of the light emitting portion 15a adjacent to the light receiving portion 15b, and the step difference interferes with the diffusion of light from the light receiving portion 15b to a partial region of the light emitting portion 15a. Is caused.

Therefore, a plurality of optical units 155 are formed in a region of the bottom 154 of the light guide plate 15 according to the present embodiment corresponding to the light incident portion 15b, thereby suppressing the occurrence of the dark portion.

In this case, the plurality of optical units 155 may be formed in the bottom surface 154 of the light guide plate 15 in a dimple shape or a line shape, or may be formed in the bottom surface 154 of the light guide plate 15 in a line shape.

In more detail, the plurality of optical units 155 are disposed according to an arrangement density pattern having a predetermined tendency in a region of the bottom surface 154 of the light guide plate 15 corresponding to the light incidence portion 15b and incident on the light incidence portion 15b. In the process of mixing the light, the light is incident on the optical unit 155, and then scattered at various angles.

In this case, the batch density refers to the number of the optical unit 155 disposed in the unit area.

That is, when the optical unit 155 is not provided, the scattering angle of light in the light guide plate 15 is determined according to the angle of the bottom surface of the light guide plate 15, but the plurality of optical units 155 are provided. As the scattering angle of light in the light guide plate 15 is variously formed, the scattering angle at which light reaches the region adjacent to the step among the regions of the light emitting unit 15a can be obtained.

In this case, when the arrangement density of the optical unit 155 is increased, as the light scattering is further activated, the luminance of the portion where the dark portion is generated may be further increased. Accordingly, the optical unit 155 is provided on the bottom surface of the light guide plate 15 in an arrangement density pattern of, for example, a predetermined size.

The arrangement density pattern of the optical unit 155 according to the present exemplary embodiment has a density in which a plurality of optical units 155 are arranged in the first direction (y-axis direction) from the incident surface 151 of the light incident part 15b. Can be formed with a tendency to increase. However, the arrangement density pattern of the optical unit 155 may also be configured to have a predetermined arrangement density on the incident surface 151 of the light incident part 15b regardless of the direction.

Although the optical unit 155 according to the present exemplary embodiment has been described as a configuration in which the bottom surface 154 of the light guide plate 15 is recessed, for example, the optical unit 155 protrudes from the bottom surface 154 of the light guide plate 15. It will be said that the configuration is also included in the spirit of the present invention.

In addition, the optical unit 155 is not formed only on the bottom surface 154 of the light guide plate 15 corresponding to the light incident portion 15b, but rather in the region of the bottom surface 154 of the light guide plate 15 corresponding to the light emitting portion 15a. It is also possible to form a configuration.

According to the proposed embodiment, an optical assembly including a plurality of light sources, a light guide plate, and a cover is modularized and assembled to the bottom cover of the backlight unit, thereby simplifying the manufacturing process of the backlight unit and increasing manufacturing efficiency. There is this.

In addition, by providing light to the display panel by using a modular backlight unit including a plurality of light guide plates, the display device is reduced in thickness, and at the same time, partial driving such as local dimming or impulsive is performed. The contrast may be improved by using the scheme.

In addition, since a plurality of optical units are provided in the light guide plate, and the optical units are provided in different density patterns according to positions of relative regions in the light guide plate, there is an advantage that a luminance difference generated in the light guide plate can be reduced. .

1-> display device
200-> Display Module
100-> Backlight Unit
110-> Bottom Cover
10-> optical assembly
13-> light source
14-> Board
15-> Light Guide Plate
17-> Reflector
18-> 1st cover
19-> 2nd Cover

Claims (20)

Board;
A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction;
A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is projected in a second direction crossing the first direction and one side of which is connected to the light incident part Light guide plate comprising; And
A cover surrounding at least a portion of the light guide plate, the substrate, and the light source;
And a plurality of optical units formed on the light guide plate to scatter the incident light in a plurality of directions. The method of claim 1,
The light is projected on one surface of the light guide plate in the second direction, and the optical unit is formed on the back surface of the light guide plate. The method of claim 2,
And the optical unit is formed in a region of the rear surface of the light guide plate corresponding to the light incident portion. The method of claim 2,
And the optical unit is recessed on a rear surface of the light guide plate. The method of claim 3, wherein
And the optical unit is formed in a dimple shape. The method of claim 1,
And a plurality of the optical units are disposed in the light guide plate according to an arrangement density pattern in which a density arranged in a direction varies. The method of claim 1,
One side of the cover contacts one surface of the light guide plate, supports one surface of the light guide plate in one direction, and the other side of the cover contacts the back surface of the light guide plate, and supports the rear surface of the light guide plate in another direction opposite to the one direction. Thereby fixing the light guide plate. The method of claim 7, wherein
And the substrate and the light source are accommodated between one side of the cover and the other side of the cover. Bottom cover;
A substrate accommodated in the bottom cover;
A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction;
A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is emitted in a second direction crossing the first direction and one side of which is connected to the light incident part A plurality of light guide plate comprising; And
A cover surrounding at least a portion of the light guide plate, the substrate and the light source, and fixed to the bottom cover;
And a plurality of optical units formed in the light guide plate to scatter the incident light in a plurality of directions. The method of claim 9,
And one side of the light guide plate to project the light in the second direction, and the optical unit is formed on the rear surface of the light guide plate. The method of claim 10,
And the optical unit is formed in an area corresponding to the light incident part of the rear surface of the light guide plate. The method of claim 10,
And the optical unit is recessed on a rear surface of the light guide plate. The method of claim 9,
One side of the cover contacts one surface of the light guide plate, supports one surface of the light guide plate in one direction, and the other side of the cover contacts the back surface of the light guide plate, and supports the rear surface of the light guide plate in another direction opposite to the one direction. To fix the light guide plate,
And a substrate and the light source between one side of the cover and the other side of the cover. The method of claim 9,
The cover may include a first cover covering one surface of the substrate on which the light source is disposed; And a second cover covering a rear surface of the substrate. The method of claim 9,
And a plurality of divided driving regions corresponding to the plurality of light guide plates, wherein each of the divided driving regions is configured to adjust luminance according to the luminance of the image signal or the color coordinate signal. A display panel on which an image is displayed;
A backlight unit positioned on a rear surface of the display panel and divided into a plurality of blocks and individually driving the plurality of blocks;
And a driver provided at the rear of the backlight unit to drive the display panel and / or the backlight unit.
The backlight unit,
Bottom cover; A substrate accommodated in the bottom cover; A plurality of light sources arranged on the substrate and configured to emit light with a predetermined direction angle about a first direction; A light incident part including an incident surface through which light is incident from the plurality of light sources in a first direction; and a light emitting part in which the incident light is emitted in a second direction crossing the first direction and one side of which is connected to the light incident part A plurality of light guide plate comprising; And a cover surrounding at least a portion of the light guide plate, the substrate and the light source, and fixed to the bottom cover.
And a plurality of optical units formed on the light guide plate to scatter the incident light in a plurality of directions. 17. The method of claim 16,
On one surface of the light guide plate, the light is projected in the second direction, and the optical unit is formed on the rear surface of the light guide plate,
And the optical unit has a predetermined tendency and is disposed on the rear surface of the light guide plate according to an optical unit placement density pattern indicating the number of the optical units with respect to a unit area. The method of claim 17,
And the optical unit is formed in a region of the rear surface of the light guide plate corresponding to the light incident portion. The method of claim 17,
And the optical unit is recessed on a rear surface of the light guide plate. 17. The method of claim 16,
The display panel is divided into a plurality of divided driving regions corresponding to the plurality of light guide plates,
A brightness of each of the divided driving regions is adjusted by adjusting luminance of at least one light source corresponding to the light guide plate corresponding to each of the divided driving regions according to the luminance of the image signal or the color coordinate signal. Device.

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