KR20140076719A - Led array unit, direct type of backlight unit having the same, and display device having the backlight unit - Google Patents

Led array unit, direct type of backlight unit having the same, and display device having the backlight unit Download PDF

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Publication number
KR20140076719A
KR20140076719A KR1020120145042A KR20120145042A KR20140076719A KR 20140076719 A KR20140076719 A KR 20140076719A KR 1020120145042 A KR1020120145042 A KR 1020120145042A KR 20120145042 A KR20120145042 A KR 20120145042A KR 20140076719 A KR20140076719 A KR 20140076719A
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South Korea
Prior art keywords
plate
light
light emitting
circuit board
emitting diodes
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KR1020120145042A
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Korean (ko)
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KR101991124B1 (en
Inventor
강이임
서은성
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엘지이노텍 주식회사
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Priority to KR1020120145042A priority Critical patent/KR101991124B1/en
Publication of KR20140076719A publication Critical patent/KR20140076719A/en
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Publication of KR101991124B1 publication Critical patent/KR101991124B1/en

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/62Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using mixing chambers, e.g. housings with reflective walls
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/65Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction specially adapted for changing the characteristics or the distribution of the light, e.g. by adjustment of parts
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/68Details of reflectors forming part of the light source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/69Details of refractors forming part of the light source
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/04Refractors for light sources of lens shape
    • F21V5/043Refractors for light sources of lens shape the lens having cylindrical faces, e.g. rod lenses, toric lenses
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00Refractors for light sources
    • F21V5/04Refractors for light sources of lens shape
    • F21V5/046Refractors for light sources of lens shape the lens having a rotationally symmetrical shape about an axis for transmitting light in a direction mainly perpendicular to this axis, e.g. ring or annular lens with light source disposed inside the ring
    • GPHYSICS
    • G02OPTICS
    • G02FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Abstract

An LED array unit comprises: an array bar including a circuit board, a plurality of light emitting diodes intermittently formed on the circuit board, and a lens covering the light emitting diodes; and a reflecting-diffusing unit including a reflecting plate having a bent part bent to reflect the light generated from the light emitting diodes from side to side arranged to face the lens, and having a plurality of optical transmission hole; and a diffusing plate diffusing the light passed the reflecting plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an LED array unit, a direct-type backlight unit having the same, and a display device having the LED array unit,

The present invention relates to an LED array unit, a direct-type backlight unit having the same, and a display device having the same.

2. Description of the Related Art Recently, display devices for displaying information in various home appliances such as mobile phones, portable game machines, tablet PCs, desktop computers, and televisions have been widely used.

A representative display device is a liquid crystal display device having a thin thickness, a high luminance, and a high resolution.

A liquid crystal display device includes a liquid crystal disposed between a pixel substrate including pixel electrodes and a color filter substrate facing a pixel substrate, and a liquid crystal device for applying light generated from the backlight unit to the liquid crystal And displays the image.

Since the liquid crystal display displays information by using light passing through the pixel substrate, the display quality of the image is greatly influenced by the luminance and luminance uniformity of the light provided to the backlight unit.

In the conventional liquid crystal display device, a cold cathode ray tube lamp disposed on the side of a display device and a side-type backlight unit including a light guide plate are widely used. Recently, however, a light emitting diode having a low power consumption characteristic and a high luminance characteristic is disposed directly below Type backlight unit is widely used.

However, the light emitting diode of the direct-type backlight unit has a high luminance but low luminance uniformity. Therefore, in order to improve the luminance uniformity of the light emitting diode, a light diffusion plate for diffusing light is disposed on the upper part of the light emitting diode, So that the thickness and the volume of the direct-type backlight unit and the display device are greatly increased.

The present invention provides an LED array unit that provides light with high luminance and high luminance uniformity while reducing thickness and volume, a direct type backlight unit having the same, and a display device having the same.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

In one embodiment, the LED array unit includes a circuit board, an LED array bar including a plurality of light emitting diodes intermittently formed on the circuit board, and a lens covering the light emitting diodes; And a plurality of light transmission holes formed in the bent portion bent to reflect light generated from the light emitting diodes to the right and left and facing the lens, and a diffusion plate coupled to the reflection plate and diffusing light passing through the reflection plate. And a reflection-diffusion unit.

In one embodiment, the direct type backlight unit includes a bottom case having a storage space therein; A light reflector disposed on a bottom plate of the bottom case; A light diffusing plate spaced apart from the light reflecting plate and coupled to the bottom case; And an LED array bar including a plurality of light emitting diodes intermittently formed on the circuit board so as to face the light reflecting plate, and a lens covering the light emitting diodes, the circuit board being disposed at a position spaced apart from the upper surface of the light reflecting plate .

In one embodiment, the direct type backlight unit includes a bottom case having a storage space therein; A light reflector disposed on a bottom plate of the bottom case; A light diffusing plate spaced apart from the light reflecting plate and coupled to the bottom case; An LED array bar including a circuit board disposed on an upper surface of the light reflection plate, light emitting diodes disposed on the circuit board facing the light diffusion plate, and a lens covering the light emitting diodes; And an additional reflection plate having a plurality of light transmission holes formed to face the lens and bent to bend the light generated from the light emitting diodes to the right and left and a light diffusion plate coupled to the additional reflection plate, Diffusing unit comprising an additional diffuser plate.

In one embodiment, the display device includes a bottom case having a storage space therein; A light reflector disposed on a bottom plate of the bottom case; A light diffusing plate spaced apart from the light reflecting plate and coupled to the bottom case; A circuit board disposed at a position spaced apart from an upper surface of the light reflector; an LED array bar including a plurality of light emitting diodes intermittently formed on the circuit board facing the light reflector; and a lens covering the light emitting diodes; And a display panel disposed on the optical diffusing plate and displaying information by using light passing through the optical diffusing plate.

According to the LED array unit, the direct-type backlight unit having the LED array unit, and the display device having the LED array unit, the light-emitting diode included in the LED array unit faces the reflection plate or the reflection- It is possible to improve the display quality of the image generated from the display panel more uniformly by improving the luminance distribution of the light generated from the light emitting diodes having the uneven luminance distribution evenly.

1 is an exploded perspective view of an LED array unit according to an embodiment of the present invention.
Fig. 2 is an assembled sectional view of Fig. 1. Fig.
3 is a cross-sectional view illustrating a direct-type backlight unit according to an embodiment of the present invention.
4 is a perspective view showing the LED array bar of Fig.
5 is a cross-sectional view illustrating a direct-type backlight unit according to an embodiment of the present invention.
6 and 7 are sectional views showing a display device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. The definitions of these terms should be interpreted based on the contents of the present specification and meanings and concepts in accordance with the technical idea of the present invention.

1 is an exploded perspective view of an LED array unit according to an embodiment of the present invention. Fig. 2 is an assembled sectional view of Fig. 1. Fig.

The LED array unit 100 includes an LED array bar 60 and a reflection-diffusion unit 90.

The LED array bar 60 includes a circuit board 20, light emitting diodes 30, and a lens 40.

The circuit board 20 is formed, for example, in the shape of a rectangular plate. The circuit board 20 may include a rigid circuit substrate having a thin thickness.

A circuit pattern having a plurality of terminals is formed on the circuit board 20, and a plurality of terminals are intermittently formed on the upper surface of the circuit board 20 along the longitudinal direction. Light emitting diodes are electrically connected to the respective terminals.

The light emitting diodes 30 are electrically connected to the terminals of the circuit patterns formed on the circuit board 20.

In one embodiment of the present invention, the light emitting diodes 30 may be formed in one row along the longitudinal direction of the circuit board 20. Alternatively, the light emitting diodes 30 may be formed in two or more rows along the longitudinal direction of the circuit board 20.

The lens 40 functions to improve the luminance uniformity by changing the outgoing angle of light generated from the light emitting diodes 30 having a plurality of intermittently formed along the longitudinal direction of the circuit board 20. [

In one embodiment of the present invention, one lens 40 can change the outgoing angle of the light generated from the plurality of light emitting diodes 30.

The lens 40 may be formed in a bar shape having a rectangular parallelepiped shape, for example.

The lens 40 includes a bottom surface 42, side surfaces 44 extending from the bottom surface 42 and side surfaces 44 and an extended top surface 46, And is formed into a concave groove shape toward the center portion.

By forming concave groove-like grooves in the upper surface 46 of the lens 40 as described above, it is possible to greatly increase the luminance uniformity by greatly increasing the outgoing angle of light generated from the light emitting diodes 30 with a narrow outgoing angle.

The reflection-diffusing unit 90 is disposed on the lens 40 of the LED array bar 60 to reflect and / or diffuse the light transmitted through the lens 40 again to reflect the light emitted from the light- Thereby further improving the luminance uniformity.

The reflection-diffusion unit 90 includes a reflection plate 60 and a diffusion plate 70.

The reflection plate 60 is made of a synthetic resin plate having a high reflectance of light or a material having a high reflectivity of light in a synthetic resin so as to have a plate shape.

The reflector 60 reflects the light generated by the light emitting diode 30 and transmitted through the lens 40 to the left or the right with reference to the lens 40. In order to achieve this, the reflector 60 includes a rectangular parallelepiped plate Shaped plate in a " V " shape. Hereinafter, the bent portion of the reflection plate 60 is defined as the bent portion 62. [

Although the reflector 60 is folded once and is formed into a bent plate shape having the bent portion 62, the folded portion may be curved with respect to the bent portion 62 in one embodiment of the present invention.

On the other hand, the reflection plate 60 includes a plurality of light transmission holes 64 for further improving luminance uniformity. A plurality of light transmission holes 64 may be regularly or irregularly formed in the reflection plate 60 and a part of the light transmitted through the lens 40 may be transmitted through the light transmission hole 64 from the light emitting diode 30 .

A part of the light emitted from the light emitting diode 30 and transmitted through the lens 40 is reflected by the reflection plate 60 in a direction different from the direction of the light transmitted through the lens 40, A part of the light generated from the light source 30 and transmitted through the lens 40 is transmitted through the light transmission hole 64 formed in the reflection plate 60.

In one embodiment of the present invention, the light transmission hole 64 of the reflection plate 60 is formed in a number and a formation density at which no shadow area is formed by the reflection plate 60.

The diffuser plate (70) is coupled to the reflector plate (60). The diffusion plate 70 is formed in the shape of a rectangular parallelepiped plate and the diffusion plate 70 diffuses light transmitted through the light transmission hole 64 of the reflection plate 60 to generate light from the light emitting diode 30, Thereby improving the luminance uniformity of the light transmitted through the light guide plate.

In one embodiment of the present invention, the reflection-diffusion unit 90 including the reflection plate 60 and the diffusion plate 70 is disposed at a position spaced apart from the lens 40 of the LED array bar 60 by a predetermined distance And the LED array bar 60 and the reflection-diffusing unit 90 can be mutually fixed by the connecting member so that the LED array bar 60 and the reflection-diffusing unit 90 are mutually fixed with a predetermined gap have.

The connecting member may be a side wall of a bottom case of a backlight unit to be described later, and may include a fixing plate for connecting both side ends of the reflection-diffusion unit 90 and both side ends of the LED array bar 60.

3 is a cross-sectional view illustrating a direct-type backlight unit according to an embodiment of the present invention. 4 is a perspective view showing the LED array bar of Fig.

3 and 4, the direct type backlight unit 200 includes a bottom case 210, a light reflector 220, a light diffusion plate 230, and an LED array bar 240.

The bottom case 210 includes a bottom plate 212 and a side plate 214.

The bottom plate 212 of the bottom case 210 is formed in a plate shape and the side plate 214 extends from the rim of the bottom plate 212 toward the top of the bottom plate 212 to form a light reflector 220, Thereby forming a storage space for storing the diffusion plate 230 and the LED array bar 240 therein. The side plate 214 of the bottom case 210 may be integrally formed with the bottom plate 212.

In one embodiment of the present invention, the bottom case 210 may be formed by pressing a metal plate or by cutting and bending a metal plate.

The light reflecting plate 220 is disposed inside the bottom case 210 and the light reflecting plate 220 may include a synthetic resin plate having a high light reflectance or a synthetic resin plate including a light reflecting material.

A part of the light reflecting plate 220 is formed in parallel with the bottom plate 212 of the bottom case 210. The ends of the light reflecting plate 220 are each bent in an oblique shape to form a side plate 214 of the bottom case 210, Respectively.

The bottom case 210 and the light reflecting plate 220 disposed inside the bottom case 210 may be coupled to each other by fastening members or adhesives such as screws.

The light diffusion plate 230 may include a diffusion plate for diffusing the light generated from the LED array bar 240 again to improve luminance uniformity. A light guide plate or the like may be disposed on the upper surface of the light diffusion plate 230 to adjust the light output angle of the light diffused from the light diffusion plate 230.

The light diffusion plate 230 may be fixed on the side plate 214 of the bottom case 210 and the light diffusion plate 230 may diffuse the light emitted from the LED array bar 240, Can be improved.

The LED array bar 240 includes a circuit board 242, light emitting diodes 244, and a lens 246.

In one embodiment of the present invention, both ends of the elidivediabar 240 are secured to opposite side plates 214 of the bottom case 210.

The circuit board 242 is formed, for example, in the shape of a rectangular plate. The circuit board 242 may include a rigid circuit substrate having a thin thickness.

A circuit pattern having a plurality of terminals is formed on the circuit board 242, and a plurality of terminals are intermittently formed on the upper surface of the circuit board 242 along the longitudinal direction. Light emitting diodes are electrically connected to the respective terminals.

A circuit pattern having terminals formed on the circuit board 242 is disposed to face the upper surface of the light reflector 220. [

In an embodiment of the present invention, the circuit board 242 is interposed between the upper surface of the light reflector 220 and the lower surface of the light diffusing plate 230. Specifically, the circuit board 242 is disposed at a position spaced apart from the upper surface of the light reflecting plate 220 by a distance s.

That is, in an embodiment of the present invention, the circuit board 242 is not disposed on the upper surface of the light reflector 220 but is disposed at a position spaced from the upper surface of the light reflector 220.

The light emitting diodes 244 are electrically connected to the terminals of the circuit pattern of the circuit board 242 disposed at a position spaced apart from the upper surface of the light reflecting plate 220.

The circuit patterns and terminals of the circuit board 242 are disposed to face the upper surface of the light reflector 220 so that the light emitting diodes 244 also face the upper surface of the light reflector 220 .

In one embodiment of the present invention, the light emitting diodes 244 may be formed in one row along the longitudinal direction of the circuit board 242. Alternatively, the light emitting diodes 242 may be formed in two or more rows along the longitudinal direction of the circuit board 242.

The lens 246 changes the outgoing angle of light generated from the plurality of light emitting diodes 244 formed intermittently along the longitudinal direction of the circuit board 242 to improve the luminance uniformity.

In one embodiment of the present invention, one lens 246 may change the exit angle of light generated from the plurality of light emitting diodes 244.

The lens 246 may be formed in a bar shape having a rectangular parallelepiped shape, for example.

The lens 246 includes a bottom surface 247, side surfaces 248 extending from the bottom surface 247 and side surfaces 248 and an extended top surface 249, And is formed into a concave groove shape toward the center portion.

By forming concave groove-shaped grooves in the upper surface 249 of the lens 246, the light output angle of the light emitted from the light emitting diode 244 with a narrow emission angle can be greatly increased, thereby further improving the luminance uniformity.

The lens 246 covering the light emitting diode 244 is also disposed on the upper surface of the light reflecting plate 220 because the light emitting diode 244 faces the upper surface of the light reflecting plate 220. In this case, And is disposed to face the upper surface.

When the light emitting diode 244 is arranged to face the upper surface of the light reflecting plate 220 as described above, the light generated from the light emitting diode 244 and passed through the lens 246 is reflected on the upper surface of the light reflecting plate 220 And is provided as a light diffusion plate 230.

The shortest length at which the light generated from the light emitting diode 244 reaches the light diffusing plate 230 is the length s between the light emitting diode 244 and the upper surface of the light reflecting plate 220, (S + d) of the sum of the length d formed by the upper surface and the lower surface of the light diffusion plate 230.

On the other hand, the sum length s + d is the shortest length at which the light generated from the light emitting diode 244 reaches the light diffusion plate 230 when the light emitting diode 244 is disposed on the upper surface of the light reflecting plate 220 the diffusion efficiency of the light when the light emitting diode 244 is directed toward the light reflecting plate 220 is higher than the diffusion efficiency of light when the light emitting diode 244 is disposed toward the light diffusion plate 230 The luminance distribution of the light passing through the light diffusion plate 230 is greatly improved.

5 is a cross-sectional view illustrating a direct-type backlight unit according to an embodiment of the present invention.

5, the direct-type backlight unit 300 includes a bottom case 310, a light reflector 320, a light diffusion plate 330, an LED array bar 340, and a reflection-diffusion unit 350 .

The bottom case 310 includes a bottom plate 312 and side plates 314.

The bottom plate 312 of the bottom case 310 is formed in a plate shape and the side plate 314 extends from the rim of the bottom plate 312 toward the top of the bottom plate 312 to form a light reflector 320, A storage space for storing the diffusion plate 330, the LED array bar 340, and the reflection-diffusion unit 350 is formed. The side plate 314 of the bottom case 310 may be formed integrally with the bottom plate 312.

In one embodiment of the present invention, the bottom case 310 may be formed by pressing a metal plate or by cutting and bending a metal plate.

The light reflection plate 320 may be disposed inside the bottom case 310 and the light reflection plate 320 may include a synthetic resin plate having a high light reflectance or a synthetic resin plate including a light reflection material.

A part of the light reflecting plate 320 is formed in parallel with the bottom plate 312 of the bottom case 310. The ends of the light reflecting plate 320 are each bent in an oblique shape to form a side plate 314 of the bottom case 310, Respectively.

The bottom case 310 and the light reflection plate 320 disposed inside the bottom case 310 may be coupled to each other by a fastening member such as a screw or an adhesive.

The light diffusion plate 330 may include a diffusion plate for diffusing light generated from the LED array bar 340 again to improve luminance uniformity. A light guide plate or the like may be disposed on the upper surface of the light diffusion plate 330 to adjust the light output angle of the light diffused from the light diffusion plate 330.

The light diffusing plate 330 may be fixed on the side plate 314 of the bottom case 310 and the light diffusing plate 330 may diffuse the light emitted from the LED array bar 340 to adjust the luminance uniformity Can be improved.

The LED array bar 340 includes a circuit board 342, light emitting diodes 344, and a lens 346.

In one embodiment of the present invention, both ends of the elidial eddy bar 340 are secured to opposite side plates 314 of the bottom case 310.

The circuit board 342 is formed, for example, in the shape of a rectangular plate. The circuit board 342 may include a rigid circuit substrate having a thin thickness.

A circuit pattern having a plurality of terminals is formed on the circuit board 342, and a plurality of terminals are intermittently formed on the upper surface of the circuit board 342 along the longitudinal direction. Light emitting diodes are electrically connected to the respective terminals.

The circuit pattern having the terminals formed on the circuit board 342 is arranged to face the lower face of the light diffusing plate 330 and the circuit board 342 is disposed on the upper face of the light reflecting plate 320. [

The light emitting diodes 344 are electrically connected to the terminals of the circuit pattern of the circuit board 342 disposed on the upper surface of the light reflecting plate 310.

In one embodiment of the present invention, the light emitting diodes 344 may be formed in a single row along the longitudinal direction of the circuit board 342. Alternatively, the light emitting diodes 342 may be formed in two or more rows along the longitudinal direction of the circuit board 342.

The lens 346 changes the outgoing angle of light generated from the plurality of light emitting diodes 344 formed intermittently along the longitudinal direction of the circuit board 342 to improve luminance uniformity.

In one embodiment of the present invention, one lens 346 can change the outgoing angle of light generated from the plurality of light emitting diodes 344.

The lens 346 may be formed in a bar shape having a rectangular parallelepiped shape, for example.

The lens 346 includes a bottom surface 347, side surfaces 348 extending from the bottom surface 347 and side surfaces 348 and an extended top surface 349, And is formed into a concave groove shape toward the center portion.

By forming concave groove-like grooves in the upper surface 349 of the lens 346 as described above, it is possible to greatly increase the luminance uniformity by greatly increasing the outgoing angle of light generated by the narrow emission angle from the light emitting diode 344.

The reflection-diffusing unit 350 is disposed on top of the lens 356 of the LED array bar 340 to reflect and / or diffuse the light transmitted through the lens 346 again to reflect the light emitted from the light- Thereby further improving the luminance uniformity.

The reflection-diffusion unit 350 includes an additional reflection plate 352 and an additional diffusion plate 354.

The additional reflecting plate 352 is made of a synthetic resin plate having a high light reflectance or a material having a high light reflectance in a synthetic resin to form a plate shape.

The additional reflector 352 serves to reflect the light transmitted through the lens 346 from the light emitting diode 344 to the left or the right with respect to the lens 346. To implement this, And may be formed by bending a rectangular parallelepiped plate-shaped plate into a 'V' shape. Hereinafter, the bent portion of the additional reflection plate 352 is defined as the bent portion 354. [

Although the additional reflector 352 is folded once and formed into a bent plate shape having the bent portion 354, the folded portion may be curved with respect to the bent portion 354 in one embodiment of the present invention.

On the other hand, the additional reflection plate 352 includes a plurality of light transmission holes 356 for further improving luminance uniformity. A plurality of light transmission holes 356 may be regularly or irregularly formed in the additional reflection plate 352 and a part of the light generated by the light emitting diode 344 and transmitted through the lens 346 may pass through the light transmission hole 356 do.

In one embodiment of the present invention, a portion of the light emitted from the light emitting diode 344 and transmitted through the lens 346 is reflected by the additional reflector 352 in a direction different from the direction of the light transmitted through the lens 346, A part of the light generated from the diode 344 and transmitted through the lens 346 is transmitted through the light transmission hole 356 formed in the additional reflection plate 352.

In one embodiment of the present invention, the light transmission hole 356 of the additional reflector 352 is formed with a number and a formation density not forming a shadow area by the additional reflector 352.

The additional diffuser plate 358 is coupled to the additional reflector 352 and is spaced apart from the diffuser plate 330. The additional diffuser plate 358 is formed in the shape of a rectangular parallelepiped plate and the additional diffuser plate 358 diffuses the light transmitted through the light transmission hole 356 of the additional reflector 352 to generate light from the light emitting diode 344, Thereby further improving the luminance uniformity of the light transmitted through the light guide plate 346.

In an embodiment of the present invention, the reflection-diffusion unit 350 including the additional reflector 352 and the additional reflector 358 is disposed at a position spaced apart from the lens 346 of the LED array bar 340 by a predetermined distance And the LED array bar 340 and the reflection-diffusion unit 350 are mutually fixed by the connecting member so that the LED array bar 340 and the reflection-diffusion unit 350 are mutually fixed with a predetermined gap .

The connecting member may be a fixing plate connecting the both side ends of the side plate 310 of the bottom case 310 or the both side ends of the reflection-diffusion unit 350 and the both side ends of the LED array bar 340.

6 and 7 are sectional views showing a display device according to an embodiment of the present invention. The display device shown in Figs. 6 and 7 has substantially the same configuration as the backlight unit shown in Figs. 3 and 4 except for the display panel 400. Fig. Therefore, redundant description of the same configuration will be omitted, and the same names and the same reference numerals will be given to the same configurations.

6 and 7, the display device 500 includes a display panel 400 disposed on the direct-type backlight unit 200, 300 shown in FIG. 3 and FIG. 4, Converts the digital signal into an image using the light generated from the direct-type backlight units 200 and 300. [

The display panel 400 includes a pixel substrate 410, a color filter substrate 420, and a liquid crystal (not shown).

The pixel substrate 410 includes a plurality of thin film transistors arranged in a matrix and a pixel electrode including transparent ITO connected to each thin film transistor.

The color filter substrate 420 includes color filters facing each pixel electrode of the pixel substrate 410 and the liquid crystal is sandwiched between the pixel substrate 410 and the color filter substrate 420.

Images having passed through the pixel substrate 410, the liquid crystal, and the color filter substrate 420 are displayed by the light having the uniform brightness generated from the direct-type backlight units 200 and 300.

As described above in detail, the light-emitting diodes included in the LED array unit are disposed to face the reflection plate, or the reflection-diffusion unit is disposed on the upper part of the LED array unit, so that the luminance distribution of light generated from the light- The display quality of the image generated from the display panel can be further improved.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

60 ... LED array bar 90 ... Reflective-diffusion unit
100 ... LED array unit 210 ... Bottom case
220 ... light reflector 230 ... light diffuser plate
200,300 ... direct type backlight unit 400 ... display panel
500 ... display device

Claims (15)

  1. An LED array bar including a circuit board, light emitting diodes intermittently formed on the circuit board, and a lens covering the light emitting diodes; And
    A bent plate bent to bend the light generated from the light emitting diodes to the right and left and facing the lens and having a plurality of light transmission holes and a diffusion plate coupled to the reflection plate and diffusing light passing through the reflection plate, And a reflection-diffusing unit including the reflection-diffusion unit.
  2. The method according to claim 1,
    Wherein the circuit board is formed in the shape of a rectangular plate, and the light emitting diodes are formed along the long side direction of the circuit board.
  3. The method according to claim 1,
    Wherein the light emitting diodes are formed in two rows along the long side direction.
  4. The method according to claim 1,
    Wherein the bottom surface of the lens is formed in the same shape and size as the circuit board and the top surface of the lens connected to the opposite side surfaces of the lens is concave from the side surfaces toward the center.
  5. The method according to claim 1,
    Wherein the reflection plate is formed in a V shape in cross section, and the diffusion plate is formed in a flat plate shape.
  6. The method according to claim 1,
    And a connection member interconnecting the LED array unit and the diffusion-reflection unit.
  7. A bottom case having a storage space therein;
    A light reflector disposed on a bottom plate of the bottom case;
    A light diffusing plate spaced apart from the light reflecting plate and coupled to the bottom case; And
    A circuit board disposed at a position spaced apart from an upper surface of the light reflector, an LED array bar including a plurality of light emitting diodes intermittently formed on the circuit board facing the light reflector and a lens covering the light emitting diodes, Type backlight unit.
  8. 8. The method of claim 7,
    And both ends of the LED array bar are coupled to sidewalls connected to the bottom plate of the bottom case.
  9. 8. The method of claim 7,
    Wherein the circuit board is formed in the shape of a rectangular plate, and the light emitting diodes are formed along the long side direction of the circuit board.
  10. 8. The method of claim 7,
    Wherein the light emitting diodes are formed in two rows along the long side direction.
  11. 8. The method of claim 7,
    Wherein the bottom surface of the lens is formed in the same shape and size as the circuit board and the upper surface of the lens connected to the opposite side surfaces of the lens is concave from the side surfaces toward the center.
  12. A bottom case having a storage space therein;
    A light reflector disposed on a bottom plate of the bottom case;
    A light diffusing plate spaced apart from the light reflecting plate and coupled to the bottom case;
    An LED array bar including a circuit board disposed on an upper surface of the light reflection plate, light emitting diodes disposed on the circuit board facing the light diffusion plate, and a lens covering the light emitting diodes; And
    An additional reflection plate having a plurality of light transmission holes formed in a bent portion bent to reflect light generated from the light emitting diodes to the right and left and having a plurality of light transmission holes formed therein and a light diffusion plate coupled to the additional reflection plate, A direct-type backlight unit comprising a reflection-diffusion unit comprising a diffuser plate.
  13. 13. The method of claim 12,
    Wherein the additional reflection plate is formed in a V shape in cross section, and the additional diffusion plate is formed in a flat plate shape.
  14. 13. The method of claim 12,
    And a connection member interconnecting the LED array unit and the diffusion-reflection unit.
  15. A bottom case having a storage space therein;
    A light reflector disposed on a bottom plate of the bottom case;
    A light diffusing plate spaced apart from the light reflecting plate and coupled to the bottom case;
    A circuit board disposed at a position spaced apart from an upper surface of the light reflector; an LED array bar including a plurality of light emitting diodes intermittently formed on the circuit board facing the light reflector; and a lens covering the light emitting diodes; And
    And a display panel disposed on the optical diffusing plate and displaying information by using light passing through the optical diffusing plate.
KR1020120145042A 2012-12-13 2012-12-13 Led array unit, direct type of backlight unit having the same, and display device having the backlight unit KR101991124B1 (en)

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Publication number Priority date Publication date Assignee Title
EP3091392A1 (en) * 2015-05-08 2016-11-09 Samsung Electronics Co., Ltd. Display apparatus
WO2018088705A1 (en) * 2016-11-14 2018-05-17 서울반도체주식회사 Display device and backlight unit thereof

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KR20050121578A (en) * 2004-06-22 2005-12-27 삼성전자주식회사 Backlight unit
KR20110064656A (en) * 2009-12-08 2011-06-15 엘지디스플레이 주식회사 Liquid crystal display device
WO2011115030A1 (en) * 2010-03-16 2011-09-22 山下電装株式会社 Solar simulator
KR101174770B1 (en) * 2005-02-28 2012-08-17 엘지디스플레이 주식회사 back light unit and liquid crystal display device using the same

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Publication number Priority date Publication date Assignee Title
KR20050121578A (en) * 2004-06-22 2005-12-27 삼성전자주식회사 Backlight unit
KR101174770B1 (en) * 2005-02-28 2012-08-17 엘지디스플레이 주식회사 back light unit and liquid crystal display device using the same
KR20110064656A (en) * 2009-12-08 2011-06-15 엘지디스플레이 주식회사 Liquid crystal display device
WO2011115030A1 (en) * 2010-03-16 2011-09-22 山下電装株式会社 Solar simulator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3091392A1 (en) * 2015-05-08 2016-11-09 Samsung Electronics Co., Ltd. Display apparatus
US9894766B2 (en) 2015-05-08 2018-02-13 Samsung Electronics Co., Ltd. Display apparatus
WO2018088705A1 (en) * 2016-11-14 2018-05-17 서울반도체주식회사 Display device and backlight unit thereof

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