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KR20110108831A - Light unit and display device having thereof - Google Patents

Light unit and display device having thereof Download PDF

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Publication number
KR20110108831A
KR20110108831A KR1020100028251A KR20100028251A KR20110108831A KR 20110108831 A KR20110108831 A KR 20110108831A KR 1020100028251 A KR1020100028251 A KR 1020100028251A KR 20100028251 A KR20100028251 A KR 20100028251A KR 20110108831 A KR20110108831 A KR 20110108831A
Authority
KR
South Korea
Prior art keywords
light emitting
light
guide plate
reflective sheet
light guide
Prior art date
Application number
KR1020100028251A
Other languages
Korean (ko)
Inventor
김태호
Original Assignee
엘지이노텍 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지이노텍 주식회사 filed Critical 엘지이노텍 주식회사
Priority to KR1020100028251A priority Critical patent/KR20110108831A/en
Publication of KR20110108831A publication Critical patent/KR20110108831A/en

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    • 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
    • G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
    • 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
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The embodiment relates to a light unit and a display device having the same.
The light unit according to the embodiment, the light guide plate; A light emitting module having a plurality of light emitting elements corresponding to at least one side of the light guide plate; And a reflective sheet disposed under the light guide plate and having an opening formed to insert at least a portion of the light emitting element.

Description

LIGHT UNIT AND DISPLAY DEVICE HAVING THEREOF}

The embodiment relates to a light unit and a display device having the same.

Recently, a liquid crystal display (LCD), which is widely used as a flat panel display device, is a passive optical device that does not emit light by itself. Therefore, a backlight assembly is attached to a rear surface of the liquid crystal panel as a light source to display an image. Therefore, the characteristics of the entire liquid crystal display device are affected by the backlight assembly structure.

The backlight assembly is classified into an edge type in which a light guide plate is disposed on the side of the lamp according to the position of the light source relative to the display surface and converts the linear light of the lamp into surface light, and a direct type in which the lamp is positioned below the display surface and does not require the light guide plate. .

The embodiment provides a light unit capable of reducing light loss around a light incident portion of a light guide plate and a display device having the same.

The embodiment provides a light unit and a display device having the same by covering both sides of the light guide plate disposed in the light emission area of the light emitting device with a reflective sheet, thereby preventing light leakage around the light incident part of the light guide plate.

The light unit according to the embodiment, the light guide plate; A light emitting module having a plurality of light emitting elements corresponding to at least one side of the light guide plate; And a reflective sheet disposed under the light guide plate and having an opening formed to insert at least a portion of the light emitting element.

In an embodiment, a display device may include: a light guide plate; A light emitting module having a plurality of light emitting elements corresponding to at least one side surface of the light guide plate and a substrate on which the plurality of light emitting elements are arranged; A reflective sheet disposed under the light guide plate and having an opening formed to insert at least a portion of the light emitting element; A bottom cover under the reflective sheet; And a display panel on the light guide plate.

The embodiment can reduce light loss in the light unit.

The embodiment can reduce light loss in the side type light unit.

The embodiment can reduce the light loss by using the reflective sheet without disposing a separate reflective frame around the light emitting module.

1 is a perspective view illustrating a display device according to a first embodiment.
2 is a side cross-sectional view of FIG. 1.
3 is an exploded view of the reflective sheet and the light emitting module of FIG. 1.
4 is a diagram illustrating an example of a reflective sheet according to an embodiment.
5 is a view showing another example of a reflective sheet according to the embodiment.
6 is a side cross-sectional view illustrating a light unit according to a second embodiment.
7 is a side cross-sectional view illustrating a light unit according to a third embodiment.
8 is a side cross-sectional view illustrating a light unit according to a fourth embodiment.
9 is a diagram illustrating an example of combining the reflective sheet and the light emitting module of FIG. 8.
10 is a side cross-sectional view illustrating a light unit according to a fifth embodiment.
FIG. 11 is a partially enlarged view of FIG. 10.

In an embodiment, each layer, region, pattern, or structure is described as being formed "on" or "under" a substrate, each layer (film), region, pad, or pattern. Where "on" and "under" include both "directly" and "indirectly". Hereinafter, in describing the embodiments, the criteria for the top or bottom of each layer may be described with reference to the drawings, and the thickness of each layer is described as an example and is not limited to the thickness of the drawings.

1 is a perspective view illustrating a display device according to a first embodiment, and FIG. 2 is a side cross-sectional view of FIG. 1. 3 is an exploded view of the reflective sheet and the light emitting module of FIG. 1.

1 to 3, the display device 100 includes a bottom cover 11, a reflective sheet 21, a light emitting module 31, a light guide plate 41, an optical sheet 51, and a display panel 61. It includes. The bottom cover 11, the reflective sheet 21, the light emitting module 31, the light guide plate 41, and the optical sheet 51 may be defined as a light unit 50.

The display panel 61 is, for example, an LCD panel and includes a liquid crystal layer interposed between the first and second substrates of a transparent material facing each other and the first and second substrates. A polarizing plate may be attached to at least one surface of the display panel 61, but is not limited thereto. The display panel 61 displays information by light passing through the optical sheet 51. The display device 100 may be applied to a portable terminal, a monitor of a notebook computer, a monitor of a laptop computer, a television, and the like.

The optical sheet 51 may include at least one light transmissive sheet, and may include at least one of a sheet such as a diffusion sheet, a horizontal and vertical prism sheet, and a brightness enhancement sheet. The diffusion sheet diffuses the incident light, the horizontal and / or vertical prism sheet focuses the incident light into the display area, and the brightness enhancement sheet reuses the lost light to improve the brightness. In addition, a protective sheet may be disposed on the display panel 61, but is not limited thereto.

A light guide plate 41 is disposed below the optical sheet 51, and the light guide plate 41 may be formed in a substantially rectangular plate shape having a predetermined thickness, and may be formed of an acrylic resin such as PMMA (polymethyl metaacrylate), PET (polyethylene). terephthlate), polycarbonate (PC), and polyethylene naphthalate (PEN) resin.

The light guide plate 41 guides the light source incident from the light emitting element 32 in the direction of the display panel 61 and converts the light source into a surface light source. The lower surface of the light guide plate 41 may be formed in a reflective pattern, and the upper surface may be formed in a flat structure without a pattern or in a pattern such as a prism shape.

The reflective sheet 21 is disposed below the light guide plate 41, and the light emitting module 31 is coupled to one side thereof. The reflective sheet 21 and the light emitting module 31 are coupled to the inner groove 12 of the bottom cover 11. The bottom cover 11 is an excellent heat dissipation material, it may include a metal or non-metal material. The bottom cover 11 includes a groove 12 in which components such as the light guide plate 41, the reflective sheet 21, and the light emitting module 31 may be accommodated. It may be inclined or perpendicular to the bottom surface, but is not limited thereto. The bottom cover 11 is coupled to the top cover not shown, the coupling member may include a screw, a hook, and the like, but is not specifically limited thereto.

The reflective sheet 21 may be disposed between the bottom cover 11 and the light guide plate 41, and the light emitting module 31 may be coupled to one side of the bottom cover 11. The light emitting module 31 may be coupled to a portion of the reflective sheet 21 at one side of the bottom cover 11.

The reflective sheet 21 includes a bottom portion 22, a side portion 23, and a top portion 24. The bottom portion 22 may be disposed on the bottom surface of the bottom cover 11 and may reflect light traveling downward through the light guide plate 1 and the light emitting element 32. The side part 23 may be bent in a vertical direction from one end of the bottom part 22 and may have an opening 25 therein, and the opening 25 may be formed in an array direction of the light emitting device 32. have. The side part 23 may be attached to the substrate 33, but is not limited thereto. The top portion 24 is bent inward from the side portion 23 so as to face one side of the bottom portion 22.

Here, the height of the side portion 23 of the reflective sheet 21 may be formed to be similar to or higher than the thickness of the light guide plate 41. As shown in FIG. 2, the length D1 of the top part 24 may vary according to the distance D2 between the light guide plate 41 and the light emitting element 32.

The top portion 24 of the reflective sheet 21 may be formed to have a length D2 that may overlap the top edge of the light guide plate 41.

The opening 25 formed in the side portion 23 of the reflective sheet 21 has a length in which the plurality of light emitting devices 32 can be accommodated in a direction in which the plurality of light emitting devices 32 are arranged as shown in FIG. 4. And may be formed in a width. The plurality of openings 25 may be formed instead of a single number, and a plurality of light emitting devices 32 may be inserted into the plurality of openings. In addition, as shown in FIG. 5, the openings 25A of the side portions 23 may be formed to accommodate the individual light emitting devices 32, and each of the openings 25 may be disposed to prevent distortion due to thermal expansion. It may be formed larger than the size of the light emitting device (32).

The light emitting module 31 includes a substrate 33 and a plurality of light emitting devices 32. The substrate 33 has a bar shape, and includes a metal PCB, a ceramic substrate, a general PCB, a flexible substrate, a FR-4, and the like, but is not limited thereto.

The substrate 33 may be, for example, perpendicular to the inner surface of the bottom cover 11 and may be fixed to the inner surface of the bottom cover 11. The light emitting device 32 may be mounted on the substrate 33 in a top view form or a side view form, but is not limited thereto.

A plurality of light emitting devices 32 are arranged on one side of the substrate 33. The light emitting devices 32 are arrayed at a predetermined pitch and may emit at least one of white, red, green, and blue light. In addition, the embodiment may implement the target color by using a combination of LEDs having one color or different colors by selectively using a chip type and a phosphor. The light emitting devices 32 may be arranged in at least one column on the front surface of the substrate 33, but the embodiment is not limited thereto. Intervals between the light emitting devices 32 may be arranged at regular intervals and at irregular intervals.

The light emitting device 32 is mounted on a front surface of the substrate 33, and corresponds to a light incident part that is one side of the light guide plate 41. That is, the light exit surface of the light emitting element 32 corresponds to one side surface of the light guide plate 41. The substrate 33 may be fixed to the inner side surface of the bottom cover 11 by selectively using an adhesive, a fastening member, or the like.

As shown in FIG. 3, the light emitting device 32 of the substrate 33 is inserted through the opening 25 formed in the side portion 23 of the reflective sheet 21. The light emitting element 32 is coupled to the side portion 23 of the reflective sheet 21, and the bottom portion 22 and the top portion 24 of the bottom cover 11 face each other on the upper and lower sides thereof.

As shown in FIG. 2, the top portion 24 and the bottom portion 22 of the reflective sheet 21 are disposed above and below the light emitting element 32 and the light guide plate 41. Among the light emitted from 32, the light reflected from the light incident portion of the light guide plate 41 is reflected. Accordingly, the light loss emitted from the light emitting device 32 can be reduced, and the overall brightness can be improved.

In addition, the top part 24 of the reflective sheet 21 may block light leaking upward between the light guide plate 41 and the substrate 33, thereby preventing light leakage. The light leakage may be prevented to improve the reliability of the light unit 50.

6 is a side cross-sectional view illustrating a light unit according to a second embodiment. In the description of the second embodiment, the same parts as the first embodiment will be referred to the first embodiment.

Referring to FIG. 6, the light unit 50A has a structure in which the heat dissipation plate 15 is disposed on one side of the bottom cover 11. The heat dissipation plate 15 may be formed of a metal or non-metal material having good heat dissipation characteristics and may have a side portion 16 and a bottom portion 17.

The side part 16 of the heat dissipation plate 15 may fix the substrate 33 of the light emitting module 31, and the bottom part 17 may be accommodated on the bottom surface of the bottom cover 17. The heat dissipation plate 15 may be coupled to an inner side surface and / or a bottom surface of the bottom cover 11 by a coupling member such as fastening and adhesive.

The bottom portion 17 of the heat dissipation plate 15 may be in close contact with the bottom portion 17 of the bottom cover 11. The bottom portion 17 of the heat dissipation plate 15 may be in close contact with the bottom portion 17 of the heat dissipation plate 15. It may be disposed below one side of the reflective sheet 21.

Heat generated from the light emitting element 32 and the substrate 33 of the light emitting module 31 is radiated through the heat dissipation plate 15, and the heat dissipation plate 15 is at the side and bottom of the bottom cover 11. Heat conducts through the face. The embodiment has a structure in which the heat dissipation plate 15 is in contact with one side of the bottom cover 11 in the bottom cover 11, but further includes a heat dissipation member such as a heat pipe in contact with the bottom surface of the heat dissipation plate 15. Heat dissipation can be performed more effectively.

7 is a side sectional view showing another light unit according to the third embodiment. In the description of the third embodiment, the same parts as the above embodiments will be referred to the above embodiments.

Referring to FIG. 7, the light unit 50B may include the heat dissipation plate 15 contacting the light emitting modules 31 and 31A and the substrate 33 of the light emitting modules 31 and 31A. It is a structure provided with 15A).

The light emitting modules 31 and 31A inject light into both light incident portions of the light guide plate 41, and the heat dissipation plates 15 and 15A support the substrate 33 of the light emitting modules 31 and 31A. The heat conducted from the substrate 33 may be self-heating or heat conduction to an element such as the bottom cover 11 or a heat pipe.

On one side and the other side of the reflective sheet 21, side portions 23 and 23A having openings 25 and 25A bent from both ends of the bottom portion 22, and top portions bent from the side portions 23 and 23A ( 24, 24A) is provided. The light emitting devices 32 are inserted into the side parts 23 and 23A, respectively, and the top parts 24 and 24A are not incident on the light guide plate 41 from the light emitted from the light emitting devices 32 in the upward direction. It reflects the light that proceeds. Accordingly, the light leakage phenomenon or the light loss between the light guide plate 41 and the light emitting element 32 can be improved.

As another example, the light emitting modules 31 and 31A may be disposed on at least two side surfaces of the light guide plate 41 without using the heat radiating plates 15 and 15A. The side surfaces on which the light emitting modules 31 and 31A may be disposed may be two side surfaces or four side surfaces facing each other among the four side surfaces of the light guide plate 41, or two side surfaces disposed at right angles to each other.

8 and 9 illustrate a light unit according to a fourth embodiment. In the description of the fourth embodiment, the same parts as in the above embodiment will be referred to the embodiment.

8 and 9, the light unit 50C forms an opening 25 in the side portion 23 of the reflective sheet 21B, and the portion cut by the opening 25 is the top portion 24B. Is used.

The side part 23 of the reflective sheet 21B may be formed as shown in FIG. 4 or 5, and the top part 24B may be formed to extend from the opening 25 of the side part 23. Can be.

Since the top portion 24B protruding from the side portion 23 extends inwardly from the opening portion 25, the light emitting element 32 is inserted into the opening portion 25 of the side portion 23 and the top portion ( 24B) can be prevented from sagging.

The top portion 24B of the reflective sheet 21B may have a structure parallel to or inclined with the top surface of the light guide plate 41 and may cover the light incident portion of the light guide plate 41 and the light emitting element 32.

10 is a view illustrating a light unit according to a fifth embodiment, and FIG. 11 is a partially enlarged view of FIG. 10. In the description of the fifth embodiment, the same parts as the above embodiments will be referred to the above embodiments.

10 and 11, in the light unit 50D, the light emitting element 32 may be mounted on an inner side surface of the bottom cover 11. The bottom cover 11 may include a metal or a non-metal material having excellent heat dissipation, and an insulating layer 5 and a circuit pattern layer (not shown) may be formed between the bottom cover 11 and the light emitting element 32. Can be. The insulating layer 5 insulates the bottom cover 11 from the bottom when the light emitting element 32 is mounted, and the circuit pattern layer is formed on the insulating layer 5. ) Can be connected to the circuit.

By attaching the light emitting device 32 to the inner side surface of the bottom cover 11 without a substrate, it is possible to improve heat dissipation efficiency, to omit the bonding process of the substrate, and to expand the information display area of the display panel. Can give

It is not intended to be limited to the above-described embodiments and the accompanying drawings, but is limited by the appended claims. Therefore, it will be apparent to those skilled in the art that various forms of substitution, modification, and alteration are possible without departing from the technical spirit of the present invention described in the claims, and the appended claims. Will belong to the technical spirit described in.

5 Insulation layer, 15, 15A heat dissipation plate, 11 bottom cover, 21, 21B reflective sheet, 31, 31A light emitting module, 32 light emitting element, 33 substrate, 41 light guide plate, 50, 50A, 50B, 50C, 50D: light unit, 51: optical sheet, 61: display panel, 100: display device

Claims (20)

Light guide plate;
A light emitting module having a plurality of light emitting elements corresponding to at least one side of the light guide plate; And
And a reflective sheet disposed under the light guide plate and having an opening formed to insert at least a portion of the light emitting element. The light unit of claim 1, wherein the light emitting module includes a substrate in which a plurality of light emitting elements are arranged in at least one column. The light unit of claim 2, wherein the substrate is vertically disposed to correspond to the side surface of the light guide plate, and the light emitting element is mounted on the front surface of the substrate such that a light exit surface corresponds to the side surface of the light guide plate. The method of claim 1, wherein the plurality of light emitting modules,
The plurality of light emitting modules are disposed in correspondence with at least two sides of the light guide plate. The light emitting device of claim 1, wherein the reflective sheet comprises: a bottom portion disposed under the light guide plate; And a side portion bent vertically from the bottom portion and having an opening portion into which the light emitting diode of the light emitting module is inserted. The light unit of claim 5, wherein the reflective sheet includes a top portion that is bent from the side portion and faces the bottom portion. The light unit of claim 5, wherein the reflective sheet includes a top portion bent from the opening portion toward the light guide plate in the side portion. The light unit of claim 6, wherein the opening formed in the side portion of the reflective sheet has a size corresponding to at least two light emitting elements or a size corresponding to individual light emitting elements. The light unit of claim 6, wherein one side of the light guide plate is disposed between a bottom portion and a top portion of the reflective sheet. The light unit of claim 1 or 2, further comprising a bottom cover disposed under the reflective sheet and on which the reflective sheet, the light guide plate, and the light emitting module are disposed. The light unit of claim 2 or 3, further comprising a heat dissipation plate disposed on a bottom surface of the substrate and the bottom cover of the light emitting module. The light unit of claim 1, wherein the light emitting elements are arranged on an inner side surface of the bottom cover. Light guide plate;
A light emitting module having a plurality of light emitting elements corresponding to at least one side surface of the light guide plate and a substrate on which the plurality of light emitting elements are arranged;
A reflective sheet disposed under the light guide plate and having an opening formed to insert at least a portion of the light emitting element;
A bottom cover under the reflective sheet; And
And a display panel on the light guide plate. The light emitting device of claim 13, wherein one side of the reflective sheet comprises: a side portion having an opening into which the light emitting element is inserted; And a top portion extending from the side portion in the direction of the light guide plate,
And a light emitting element corresponding to the light guide plate on a lower surface of the top portion of the reflective sheet. The method of claim 13, wherein the light emitting module comprises a plurality,
The plurality of light emitting modules may correspond to at least two side surfaces of the light guide plate. The display device of claim 13, wherein the opening formed in the side portion of the reflective sheet is formed to have a size corresponding to at least two light emitting elements or a size corresponding to individual light emitting elements. The display device of claim 13, further comprising a heat dissipation plate disposed on a bottom surface of the light emitting module and the bottom cover. The display device of claim 13, further comprising at least one optical sheet between the light guide plate and the display panel. The display device of claim 14, wherein the top portion of the reflective sheet is formed from an end portion or a side portion of the reflective sheet. The display device of claim 14, wherein one side of the reflective sheet reflects the light deviating from one side of the light guide plate among the light emitted from the light emitting diode.
KR1020100028251A 2010-03-30 2010-03-30 Light unit and display device having thereof KR20110108831A (en)

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KR1020100028251A KR20110108831A (en) 2010-03-30 2010-03-30 Light unit and display device having thereof

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Application Number Priority Date Filing Date Title
KR1020100028251A KR20110108831A (en) 2010-03-30 2010-03-30 Light unit and display device having thereof

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KR20110108831A true KR20110108831A (en) 2011-10-06

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KR1020100028251A KR20110108831A (en) 2010-03-30 2010-03-30 Light unit and display device having thereof

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140079205A (en) * 2012-12-18 2014-06-26 엘지디스플레이 주식회사 Back Light Unit and Liquid Crystal Display Device Using The Same
KR102694445B1 (en) * 2023-12-22 2024-08-13 주식회사 에이엘테크 Surface emitting floor traffic light

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140079205A (en) * 2012-12-18 2014-06-26 엘지디스플레이 주식회사 Back Light Unit and Liquid Crystal Display Device Using The Same
KR102694445B1 (en) * 2023-12-22 2024-08-13 주식회사 에이엘테크 Surface emitting floor traffic light

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