KR20110087106A - Optical assembly, backlight unit having the same, and display apparatus thereof - Google Patents

Optical assembly, backlight unit having the same, and display apparatus thereof Download PDF

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Publication number
KR20110087106A
KR20110087106A KR1020100006579A KR20100006579A KR20110087106A KR 20110087106 A KR20110087106 A KR 20110087106A KR 1020100006579 A KR1020100006579 A KR 1020100006579A KR 20100006579 A KR20100006579 A KR 20100006579A KR 20110087106 A KR20110087106 A KR 20110087106A
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KR
South Korea
Prior art keywords
light
cover
light source
substrate
guide plate
Prior art date
Application number
KR1020100006579A
Other languages
Korean (ko)
Inventor
정원묵
Original Assignee
엘지전자 주식회사
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Priority to KR1020100006579A priority Critical patent/KR20110087106A/en
Publication of KR20110087106A publication Critical patent/KR20110087106A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0075—Arrangements of multiple light guides
    • G02B6/0078—Side-by-side arrangements, e.g. for large area displays
    • G02B6/008—Side-by-side arrangements, e.g. for large area displays of the partially overlapping type
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means

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 from which the light is incident from the plurality of light sources in a first direction; Light guide plate comprising; And a cover surrounding at least a portion of the light guide plate, the substrate, and the light source and in contact with at least a portion of the light source.

Figure P1020100006579

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 number of flat panel display apparatuses capable of being shaped as 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 may include, for example, a display panel displaying an image, a backlight unit configured to provide light to the display panel, and including a plurality of light sources.

An object of the present embodiment is to propose a display device in which the heat emitted from the light source of the backlight unit is efficiently dissipated, thereby preventing the light source and the optical assembly including the light source from being burned out by the heat.

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 emitted 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 in contact with at least a portion of the light source.

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 plates comprising; A cover surrounding at least a portion of the light guide plate, the substrate and the light source and in contact with at least a portion of the light source; And an optical sheet disposed above the light guide plate.

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, divided into a plurality of blocks, and the plurality of blocks individually driven; 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 plates comprising; A cover surrounding at least a portion of the light guide plate, the substrate and the light source and in contact with at least a portion of the light source; And an optical sheet disposed above the light guide plate.

According to the proposed embodiment, as the cover which fixes the optical assembly directly to the light source of the optical assembly for providing light in the display device, there is an advantage that the heat due to the light emitting operation can be smoothly dissipated.

In addition, by providing light to the display panel using a modular backlight unit composed of 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.

1 is an exploded perspective view showing the configuration of a display device according to the present embodiment.
2 is a cross-sectional view showing a display module configuration according to the AA diagram of FIG.
3 is a plan view briefly showing the configuration of the backlight unit;
4 is a perspective view showing an optical assembly according to the present embodiment.
5 is an exploded perspective view of the optical assembly according to the present embodiment.
6 is a cross-sectional view taken along line BB of FIG. 4.
7 is an enlarged view of a portion C of FIG. 6.
8 is an enlarged view of a portion E of FIG. 5;
9 is an enlarged view of a portion D of FIG. 4.
10 is a cross-sectional view taken along line FF of FIG. 9;

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 embodiment includes a plurality of optical assemblies 10 including a light source 13, a substrate 14, a light guide plate 15, a reflective member 17, and a fixing bracket 18, respectively. ) And the optical sheet 220 provided between the display panel 210 and 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 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 the third direction, which is the x-axis direction crossing 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. 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. FIG. 7 is an enlarged view of a portion C of FIG. 6.

4 to 7, at least a part of the optical assembly 10 of the display apparatus 1 according to the present exemplary embodiment may be arranged to be 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 plurality of light sources 13 in a first direction, and a second direction (z-axis) in which the incident light intersects the first direction. Direction) and one side of the light guide plate 15 including a light emitting part 15a connected to the light incident part 15b, at least a portion of the light guide plate 15, the substrate and the light source, and at least a part of the light source. And covers 18 and 19 in contact with.

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 on the rear region k2 based on the first direction of the substrate body 141, and the front region k1 is formed on the front side of the rear region k2, and the front region The size of k1 may be larger than that of the rear region k2.

This is required to secure a support space having a predetermined size to support at least a portion of the light guide plate 15 and the reflective member 17 in the front region k1, and in the state where only the width at which the light source 13 is mounted is secured. As the size of the rear region k2 is reduced, the width of the bezel area of the display module where the rear region k2 is located, that is, the edge of the display module, may be reduced, so that the width of the rear region k2 is at least as small as possible. Because it must be reduced.

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.

On the other hand, the light source 13 is provided in the protruding state on the upper surface of the substrate body 141, the configuration in which the light source 13 is provided on the substrate 14 will be described in detail.

8 is an enlarged view of a portion E of FIG. 5. 8 illustrates a state in which the first cover 18 of the covers 18 and 19 is removed from the optical assembly 10 according to the present embodiment.

Referring to FIG. 8, the other side of the reflective member 17 provided on the bottom surface of the light guide plate 15 is seated and fixed to the top surface of the substrate 14.

In this case, a plurality of light sources 13 are mounted on the upper surface of the substrate 14, and the plurality of light sources 13 protrude from the upper surface of the substrate 14 by a predetermined height in a second direction (z-axis direction). That is, the light sources 13 according to the present exemplary embodiment may be provided as light sources of side emission type in which a direction (z-axis direction) protruding from the substrate 14 and a direction in which light is emitted (y-axis direction) cross each other. have.

 The other side of the reflective member 17 is formed to have a size corresponding to the light sources 13, and a plurality of light source through-holes 171 corresponding to positions at which the light sources 13 are mounted are formed.

Accordingly, as the other side of the reflective member 17 is seated on the upper surface of the substrate 14, the plurality of light sources 13 corresponding to the light source through-holes 171 of the reflective member 17 pass through the substrate. Fixing of the reflective member 17 to the 14 can be performed.

On the other hand, the light source 13 includes a plurality of surfaces, for example, one side is formed in the shape of a polyhedron fixed to the substrate 14. The light source 13 is formed on one surface of the light source 13 to form a light emitting surface 132 through which light is emitted, and an external shape of the light source 13, and protrudes in a second direction protruding from the substrate 14. It includes a housing 131 formed in a shape.

The housing 131 forms another surface of the light source 13 except for the light emitting surface 132, and a light emitting circuit and a plurality of elements may be accommodated therein.

Again, referring to FIGS. 5 to 7, the light guide plate 15 is made of a transparent material, for example, an acrylic resin series such as polymethyl metaacrylate (PMMA), polyethylene terephthlate (PET), polycarbonate (PC), and PEN. It may include one of the (polyethylene naphthalate) resin. 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.

In more detail, the light guide plate 15 is refracted and scattered in front of the light source 13 (ie, the y-axis direction), that is, the side incident light, which is formed in the upper direction (z-axis direction), that is, the display panel 210 direction. The lower surface of the light guide plate 15 is formed to be inclined upward toward the front so as to efficiently emit light incident from the side upward.

At least a portion of the bottom surface of the light guide plate 15 is seated and supported by the front region k1 of the substrate body 141.

In addition, the light guide plate 15 includes a light incident portion 15b having an incident surface 151 facing away from the light source 13 at a predetermined distance, and a light emitting portion 15a extending forward from the light incident portion 15b. More).

At this time, the rear side where the incident surface 151 is located in the light guide plate 15 is called one side of the light guide plate 15, and the end of the light guide plate 15 positioned on the opposite side of the one side of the light guide plate 15 is referred to as the light guide plate 15. Can be said to be the other side.

A plurality of light incident on the light guide plate 15 through the incident surface 151 from the plurality of light sources 13 is synthesized into one light while passing through the light incident part 15b and diffused through the light emitting part 15a. As a result, the light guide plate 15 is discharged upward.

That is, one side of the light emitting unit 15a is connected to the other side of the light receiving unit 15b, and the light synthesized by the light receiving unit 15b is upward, that is, through the light emitting unit upper surface 153 of the light emitting unit 15a. Is released.

In addition, the light incident part upper side surface 152 and the light emitting part upper side surface 153 of the light incident part 15b are formed at different heights, and the height difference between the light incident part upper side surface 152 and the light emitting part upper side surface 153 is different. As a result, a step of a predetermined size is formed.

At least a part of the covers 18 and 19 is covered on the light incident part upper side surface 152, and another part is covered to the bottom surface of the light guide plate 15, and the covers 18 and 19 surround at least a part of the light guide plate 15. It becomes cheap.

The covers 18 and 19 are covered by at least a portion of the light incidence upper side surface 152 to press the light incidence portion 15b of the light guide plate 15 to the substrate 14 side, and the first cover. And a second cover 19 connected to the first surface 18, on which at least a portion of the bottom surface of the light guide plate 15 and the substrate 14 are seated.

The first cover 18 and the second cover 19 may be, for example, bent plate-shaped metal material, a part of the light guide plate 15, the substrate between the first cover 18 and the second cover 19. 14 and the light source 13 are accommodated and fixed.

At this time, a heat transfer member 145 is further interposed between the second cover 19 and the substrate 14 to allow the heat generated from the light source 13 of the substrate 14 to be smoothly transferred to the second cover 19. Can be.

In addition, the first cover 18 may be formed in a shape corresponding to the light source 13, and a light source accommodating part 183 may be formed to contact at least a portion of the light source 13.

Hereinafter, the configuration of the first cover 18 will be described in detail.

9 is an enlarged view of a portion D of FIG. 4. In FIG. 9, one side of the optical assembly 10 is illustrated with the first cover 18 assembled to the optical assembly 10.

4 to 9, the first cover 18 is covered by the light incident part upper side 152 of the light incident part 15b to press the light incident part upper side 152 toward the second cover 19. do.

Then, the first cover 18 and the second cover (19) surrounding the at least a portion of the light guide plate 15, the substrate 14 and the light source 13, the first cover 18 and the second cover ( The fastening member 70 penetrates 19 to fix the components of the optical assembly 10, that is, the light guide plate 15, the substrate 14, the light source 13, and the covers 18, 19.

On the other hand, the first cover 18 is bent with respect to the first region 181 and the first region 181, the inner surface is in contact with the upper surface 152 of the light incident portion, one side 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.

A light source accommodating part 183 having a shape corresponding to the light sources 13 protruding from the upper surface of the substrate 14 is formed in the first region 181.

The light source accommodating part 183 is bent in a shape corresponding to the light sources 13 on one side of the first region 181. As the inner surface of the light source accommodating part 183 is contacted with at least a part of the housing 131 of the light source 13, the light source accommodating part in which heat emitted from the light source 13 is in contact with at least a part of the housing 131. It may be delivered to the first cover 18 through 183.

That is, the housing 131 formed of a polyhedron having at least two surfaces is in contact with the inner surface of the light source accommodating part 183. The light source accommodating part 183 may be bent in the first region 181 to surround at least two or more surfaces of the plurality of surfaces of the housing 131.

On the other hand, the second cover 19 is provided on the other side of the substrate seating portion 191 and the substrate seating portion 191 is formed on one side is bent to contact the first cover 18, the substrate 14 is seated The light guide plate support part 192 is bent at a predetermined angle so that the bottom inclined upward of the light emitting part 15b is supported.

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 175, a substrate side through hole 145, and a second cover side through hole may be formed to fix the elements to each other.

Accordingly, the first cover 18, the reflective member 17, the substrate 14, and the second cover 19 are fixed to each other by the fastening member 70, and the first cover 18 and the second cover ( As at least a part of the light guide plate 15 is sandwiched between 19, the assembly of the optical assembly 10 may be performed.

The assembled optical assembly 10 is fixed to the bottom cover 110, and the rear surface of the second cover 19 of the optical assembly 10 is in contact with the inner surface of the bottom cover 110.

On the other hand, the heat H emitted from the light source 13 is emitted to the outside through the first cover 18 in contact with the light source 13 and the second cover 19 in contact with the substrate 14.

Hereinafter, the heat dissipation structure of the light source 13 of the optical assembly 10 will be described in detail.

10 is a cross-sectional view taken along line F-F of FIG. 9.

Referring to FIG. 10, as described above, the inner surface of the light source accommodating part 183 formed in the first cover 18 is in contact with at least a portion of the housing 131 of the light source 13. In addition, the substrate 14 may be seated and contact the substrate mounting portion 141 of the second cover 19.

When the light emission operation is performed in which the light is emitted from the light source 13 in the first direction (y-axis direction), heat H is generated according to the light emission operation, and heat H is the housing of the light source 13. The light source 13 is emitted outside the light source 13 through the substrate 14 on which the 131 and the light source 13 are mounted.

In this case, the lower surface of the housing 131 and the substrate 14 of the light source 13 are respectively formed on the inner surface of the light source accommodating part 183 of the first cover 18 and the substrate mounting part 191 of the second cover 19. Directly in contact with the inner surface, the heat (H) can be emitted to the outside of the optical assembly 10 through the first cover 18 and the second cover (19).

In addition, as the first cover 18 and the second cover 19 are formed of a metal material having a large heat transfer coefficient, the heat H is smoothly aired through the first cover 18 and the second cover 19. The middle or second cover 19 may be emitted to the outside through the bottom cover 110 in contact.

In this case, a light source is formed between an inner surface of the light source accommodating part 183 of the first cover 18 and an inner surface of the substrate seating part 191 of the second cover 19, a housing of the light source 13, and a lower surface of the substrate 14. A heat transfer member 145 for transferring heat of (13) may be further involved, such that the first cover 18 and the second cover 19 may be indirectly in contact with the light source 13 and the substrate 14. .

According to the proposed embodiment, as the covers 18 and 19 are directly in contact with the light source 13 of the optical assembly 10 that provides light in the display device 1, heat is smoothly dissipated due to the light emission operation. There is an advantage that can be.

In addition, by providing light to the display panel using a modular backlight unit composed of 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.

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 (18)

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 emitted 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
And a cover surrounding at least a portion of the light guide plate, the substrate, and the light source and in contact with at least a portion of the light source. The method of claim 1,
The light source is provided in a shape protruding on one surface of the substrate,
The cover has an optical assembly formed with a light source accommodating portion bent to a shape corresponding to the shape of the light source protruding. The method of claim 1,
The light source is
A light emitting surface formed on one surface of the light source and emitting light; And
And a housing provided in the protruding shape on the substrate and forming other surfaces of the light sources other than the light emitting surface of the light source in which the light emitting surface is formed, and at least one surface of which is in contact with the cover. The method of claim 3, wherein
The cover is formed in a shape corresponding to the one light source, the optical assembly is formed with a light source receiving portion that is in contact with at least a portion of the housing. The method of claim 4, wherein
And an inner surface of the light source accommodating part and the housing are in contact with a heat transfer member provided between the inner surface of the light source accommodating part and the housing. The method of claim 4, wherein
The housing is formed of a polyhedron having at least two sides,
And the light source accommodating portion is bent to the cover in a shape surrounding at least two or more surfaces of the plurality of surfaces of the housing. The method of claim 4, wherein
The cover is
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, wherein the light source accommodating portion is formed in the first cover. The method of claim 1,
One side is located on the bottom surface of the light emitting portion, and the other side further comprises a reflective member formed with a through hole through which the light source passes. 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 plates comprising;
A cover surrounding at least a portion of the light guide plate, the substrate and the light source and in contact with at least a portion of the light source; And
And a optical sheet disposed above the light guide plate. The method of claim 9,
The light source may include a light emitting surface formed on one surface of the light source and emitting light; And a housing provided in a shape protruding from the substrate, the housing forming other surfaces of the light sources other than the light emitting surface of the light source in which the light emitting surface is formed, and at least one surface of which is in contact with the cover.
The cover unit is formed in a shape corresponding to one of the light source, the back light unit, characterized in that the inner surface is formed in contact with at least a portion of the housing. The method of claim 10,
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, wherein the light source accommodating part is formed in the first cover. The method of claim 9,
At least a portion of the light guide plate is mounted on one surface of the substrate. The method of claim 12,
One side of the cover is in contact with the rear surface of the substrate, the other side of the cover is in contact with the opposite side of the portion of the light guide plate seated on one surface of the substrate,
And a fixing member penetrating the cover to fix the cover, the light guide plate, and the substrate with respect to the bottom cover. 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 luminance or color coordinate signals of an image signal. A display panel on which an image is displayed;
A backlight unit positioned on a rear surface of the display panel, divided into a plurality of blocks, and the plurality of blocks individually driven;
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 plates comprising;
A cover surrounding at least a portion of the light guide plate, the substrate and the light source and in contact with at least a portion of the light source; And
And an optical sheet disposed above the light guide plate. The method of claim 15,
The light source may include a light emitting surface formed on one surface of the light source and emitting light; And a housing provided in a shape protruding from the substrate, the housing forming other surfaces of the light sources other than the light emitting surface of the light source in which the light emitting surface is formed, and at least one surface of which is in contact with the cover.
And a light source accommodating part formed in the cover in a shape corresponding to one light source, the inner surface of which is in contact with at least a portion of the housing. The method of claim 15,
One side of the cover is in contact with the rear surface of the substrate, the other side of the cover is in contact with the opposite side of the portion of the light guide plate seated on one surface of the substrate,
And a fixing member penetrating the cover to fix the cover, the light guide plate, and the substrate with respect to the bottom cover. The method of claim 15,
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.
KR1020100006579A 2010-01-25 2010-01-25 Optical assembly, backlight unit having the same, and display apparatus thereof KR20110087106A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020100006579A KR20110087106A (en) 2010-01-25 2010-01-25 Optical assembly, backlight unit having the same, and display apparatus thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020100006579A KR20110087106A (en) 2010-01-25 2010-01-25 Optical assembly, backlight unit having the same, and display apparatus thereof

Publications (1)

Publication Number Publication Date
KR20110087106A true KR20110087106A (en) 2011-08-02

Family

ID=44925995

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020100006579A KR20110087106A (en) 2010-01-25 2010-01-25 Optical assembly, backlight unit having the same, and display apparatus thereof

Country Status (1)

Country Link
KR (1) KR20110087106A (en)

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