KR20110113283A - Light emitting diode backlight unit and liquid crystal display device having the same - Google Patents

Light emitting diode backlight unit and liquid crystal display device having the same Download PDF

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Publication number
KR20110113283A
KR20110113283A KR1020100032582A KR20100032582A KR20110113283A KR 20110113283 A KR20110113283 A KR 20110113283A KR 1020100032582 A KR1020100032582 A KR 1020100032582A KR 20100032582 A KR20100032582 A KR 20100032582A KR 20110113283 A KR20110113283 A KR 20110113283A
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KR
South Korea
Prior art keywords
led
printed circuit
circuit board
backlight unit
liquid crystal
Prior art date
Application number
KR1020100032582A
Other languages
Korean (ko)
Inventor
양신우
Original Assignee
엘지디스플레이 주식회사
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Priority to KR1020100032582A priority Critical patent/KR20110113283A/en
Publication of KR20110113283A publication Critical patent/KR20110113283A/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
    • G02F1/133308—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
    • G02F1/133605—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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/46—Fixing elements
    • G02F2201/465—Snap -fit

Abstract

A light emitting diode (LED) backlight unit of the present invention and a liquid crystal display device having the same include a diffuser plate for fixing a reflector in a liquid crystal display device having a direct type LED backlight unit. The supporter (DPS) is used to reduce the manufacturing cost of the reflector plate by removing the screw holes for the reflector plate while removing the screw holes, and to secure the price competitiveness of the LED backlight unit. A plurality of LED printed circuit boards fastened to the lower cover through fastening means; A plurality of LEDs spaced at a predetermined interval on the LED printed circuit board; A reflection plate disposed between the LED and the LED printed circuit board to reflect light generated from the LED; An optical sheet such as a diffusion plate disposed on the plurality of LEDs to diffuse and collect light generated from the LEDs; And a diffusion plate support member provided between the reflective plate and the diffuser plate to prevent sagging of the optical sheet, and fastened to the lower cover through a fastening part, wherein the fastening means is covered and covered by the reflective plate. do.
In addition, the LED backlight unit and the liquid crystal display device having the same of the present invention, by removing the screw holes of the reflecting plate and replacing the fixing screw of the LED printed circuit board with a resin pin (mura) by the screw (mura) ) To prevent defects.

Description

LIGHT EMITTING DIODE BACKLIGHT UNIT AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a light emitting diode backlight unit and a liquid crystal display device having the same, and more particularly, to a light emitting diode backlight unit for supplying light to a liquid crystal display panel through a plurality of light emitting diodes (LEDs) and It relates to a liquid crystal display device.

BACKGROUND ART In general, a liquid crystal display device is a display device in which data signals according to image information are individually supplied to pixels arranged in a matrix, and a desired image is displayed by adjusting light transmittance of the pixels.

Accordingly, the liquid crystal display includes a liquid crystal display panel in which pixels are arranged in a matrix and a driving unit for driving the pixels.

The liquid crystal display panel may be a thin film transistor array substrate, a color filter substrate, and a liquid crystal layer formed in a cell gap between the array substrate and the color filter substrate, which are bonded to face each other to maintain a uniform cell gap. It is composed.

In this case, a common electrode and a pixel electrode are formed on the liquid crystal display panel where the array substrate and the color filter substrate are bonded to apply an electric field to the liquid crystal layer.

Therefore, when the voltage of the data signal applied to the pixel electrode is controlled while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode. Characters or images are displayed by transmitting or blocking light for each pixel.

In this case, the liquid crystal display is a light-receiving element that does not emit light by itself and displays an image by controlling the transmittance of light from the outside, so that a separate device for irradiating light to the liquid crystal display panel, that is, a backlight unit Is required.

The backlight unit may include a lamp disposed at one side or both sides of the liquid crystal display panel such that light is reflected, diffused, and collected through the light guide plate, the reflector plate, and the optical sheets to be transmitted to the front surface of the liquid crystal display panel. A side type and a lamp are disposed on a rear surface of the liquid crystal display panel so that light is directly transmitted to the front surface of the liquid crystal display panel.

1 is a perspective view schematically illustrating a side type backlight unit.

Referring to FIG. 1, the side type backlight unit includes a light guide plate 10 disposed on a rear surface of a liquid crystal display panel (not shown), lamps 20 disposed on a side surface of the light guide plate 10, and a light guide plate 10. A reflector 30 disposed on the rear surface, a lamp holder (not shown) for fixing the lamp 20 to the side surface of the light guide plate 10, a wiring for applying power to the lamp reflector 25 and the lamp 20. It consists of 26 pieces.

The light generated by the lamp 20 is incident on the side of the light guide plate 10 of a transparent material, and the reflector 30 disposed on the rear surface of the light guide plate 10 receives light transmitted through the rear surface of the light guide plate 10. Reflected to the upper surface of 10) to reduce the loss of light and improve the uniformity.

Therefore, the light guide plate 10 transmits the light generated by the lamp 20 together with the reflecting plate 30 to the upper surface.

2 is a perspective view schematically illustrating a direct type backlight unit.

Referring to FIG. 2, a direct type backlight unit includes a reflector 30 disposed on a rear surface of a liquid crystal display panel (not shown) and a plurality of light incident light incident on the entire rear surface of the liquid crystal display panel. Lamps 20, a cover for covering the lamp 20, a diffuser plate 40 for diffusing light generated from the lamp 20, and a wiring for applying power to the lamp 20 ( 26).

Generally, the lamp 20 applied to the side type backlight unit or the direct type backlight unit has a tube type cold cathode fluorescent lamp having a length corresponding to the long side distance or short side distance of the liquid crystal display panel. Cathode Fluorescence Lamp (CCFL) is applied, and the cold cathode fluorescent lamp generates white light by the power supplied through the wiring 26 at both ends.

In this case, when the CCFL is applied as a light source of the backlight unit, a fluorescent discharge tube in which mercury (Hg) gas containing argon (Ar), neon (Ne), etc. is added at a low pressure is used to use a penning effect. I use it. In this case, electrodes are formed at both ends of the fluorescent discharge tube, and the cathode is formed in a wide plate shape, and when voltage is applied, charged particles in the discharge tube collide with the plate-shaped negative electrode to generate secondary electrons, as in the sputtering phenomenon. The elements are excited to form a plasma. These elements emit strong ultraviolet light, which in turn excites the phosphor, causing the phosphor to emit visible light.

However, the backlight unit using the CCFL has a disadvantage in that the color reproducibility is not good because the light emission characteristics of the light source itself are not good, and it is difficult to obtain a high brightness backlight unit due to the limitation of the size and capacity of the fluorescent lamp.

In addition, mercury applied as a fluorescent material to the CCFL is harmful to the human body, and thus there is a problem in that it cannot cope with the stricter environmental regulations.

In recent years, time-division of one frame of an image into a plurality of subframes in order to improve transmittance and color reproducibility of a liquid crystal display, and sequentially red, green, and blue light according to the plurality of subframes. Although time-division type liquid crystal display devices are being actively developed, the backlight unit to which the CCFL is applied has a problem that the range applicable to the time-division liquid crystal display device is limited.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and there is no problem caused by the environmental regulations of the CCFL, and an object of the present invention is to provide an LED backlight unit and a liquid crystal display device having the same, which can be applied to a time-division type liquid crystal display device. have.

Another object of the present invention is to provide an LED backlight unit having a direct type LED backlight unit and an LED backlight unit having an improved manufacturing cost of the reflecting plate by removing a screw hole of the reflecting plate and a liquid crystal display device having the same.

Another object of the present invention is to provide an LED backlight unit and a liquid crystal display device having the same to prevent the failure of the mura by the fixing screw of the LED printed circuit board.

Other objects and features of the present invention will be described in the configuration and claims of the invention described below.

In order to achieve the above object, the LED backlight unit of the present invention is disposed parallel to each other on the lower cover, a plurality of LED printed circuit board is fastened to the lower cover through a fastening means; A plurality of LEDs spaced at a predetermined interval on the LED printed circuit board; A reflection plate disposed between the LED and the LED printed circuit board to reflect light generated from the LED; An optical sheet such as a diffusion plate disposed on the plurality of LEDs to diffuse and collect light generated from the LEDs; And a diffusion plate support member provided between the reflective plate and the diffuser plate to prevent sagging of the optical sheet, and fastened to the lower cover through a fastening part, wherein the fastening means is covered and covered by the reflective plate. do.

A liquid crystal display device having an LED backlight unit of the present invention includes a liquid crystal display panel in which pixels are arranged in a matrix form; A plurality of LED printed circuit boards disposed on the lower cover in parallel to each other and fastened to the lower cover through fastening means; A plurality of LEDs spaced at predetermined intervals on the LED printed circuit board to supply light to the liquid crystal display panel; A reflection plate disposed between the LED and the LED printed circuit board to reflect light generated from the LED; An optical sheet such as a diffusion plate disposed on the plurality of LEDs to diffuse and collect light generated from the LEDs; And a diffusion plate support member provided between the reflective plate and the diffuser plate to prevent sagging of the optical sheet, and fastened to the lower cover through a fastening part, wherein the fastening means is covered and covered by the reflective plate. do.

As described above, the LED backlight unit and the liquid crystal display device having the same according to the present invention reduce the manufacturing cost of the reflector by removing the screw holes while removing the screw for fixing the reflector, thereby securing the price competitiveness of the LED backlight unit. to provide.

In addition, the LED backlight unit and the liquid crystal display device having the same according to the present invention reduce the assembly time of the backlight by simultaneously replacing the fixing screw of the LED printed circuit board with a resin pin with the removal of the screw hole of the reflecting plate. Mura defects due to this can be prevented. The result is the ability to improve image quality for direct-type LED backlight units.

1 is a perspective view schematically showing a side type backlight unit.
2 is a perspective view schematically showing a direct type backlight unit;
3 is a schematic cross-sectional view of a portion of a liquid crystal display device having a light emitting diode backlight unit according to the present invention;
4 is a plan view schematically illustrating the internal structure of a light emitting diode backlight unit according to a first embodiment of the present invention;
5 is a schematic cross-sectional view taken along line AA ′ of the LED backlight unit according to the first embodiment of the present invention illustrated in FIG. 4.
6 is a plan view schematically illustrating the internal structure of a light emitting diode backlight unit according to a second embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view taken along line BB ′ of the LED backlight unit according to the second embodiment of the present invention illustrated in FIG. 6.
8 is a plan view schematically illustrating the internal structure of a light emitting diode backlight unit according to a third embodiment of the present invention;
9A and 9B are schematic views illustrating a cross section taken along line CC ′ of the LED backlight unit according to the third embodiment of the present invention illustrated in FIG. 8.
10A and 10B schematically show pins for fixing the diffusion plate support member and the LED printed circuit board used in the present invention, respectively.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the LED backlight unit and the liquid crystal display device having the same according to the present invention.

Recently, the LED has been spotlighted as a light source of the backlight unit of the liquid crystal display, LED has a longer life than CCFL and has the advantage that does not require a separate inverter because it operates at a DC of 5V.

In other words, the high-brightness LED has a longer lifespan than the existing CCFL, and consumes only 20% of the existing product, and does not require any additional equipment such as an inverter. In addition, the color implementation ability has been evaluated to be superior to the CCFL, and since 2006, mercury regulations have been in full swing worldwide, which is emphasizing the adoption of LED backlights.

Currently, as flat panel displays are becoming more interested in LED models worldwide, many models using LED backlight units are being developed. Accordingly, an LED backlight unit and a liquid crystal display device having the same have excellent image quality but have a cost competitiveness by developing a method for reducing the material cost of a direct type model having a high manufacturing cost of a backlight unit.

3 is a cross-sectional view schematically illustrating a part of a liquid crystal display device having a light emitting diode backlight unit according to the present invention.

As shown in the figure, the liquid crystal display device is provided in the liquid crystal display panel 100 and the lower portion of the liquid crystal display panel 100 is arranged in a matrix form to supply light to the liquid crystal display panel 100 It is composed of a backlight unit and a bottom cover 150 on which the elements constituting the backlight unit are installed.

The liquid crystal display panel 100 is formed in the cell substrate between the array substrate 110 and the color filter substrate 105 and the array substrate 110 and the color filter substrate 105 bonded to each other to maintain a uniform cell gap. It consists of a liquid crystal layer (not shown).

In this case, although not shown in detail, a common electrode and a pixel electrode are formed on the liquid crystal display panel 100 where the array substrate 110 and the color filter substrate 105 are bonded to each other, and an electric field is applied to the liquid crystal layer. When the voltage of the data signal applied to the pixel electrode is controlled while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to an electric field between the common electrode and the pixel electrode, thereby causing light per pixel. Characters or images are displayed by transmitting or blocking them.

In order to control the voltage of the data signal applied to the pixel electrode for each pixel, a switching element such as a thin film transistor (TFT) is individually provided in the pixels.

The LED backlight unit according to the present invention is installed below the liquid crystal display panel 100 configured as described above. In the present invention, a plurality of LEDs (not shown) are arranged in an array form below the liquid crystal display panel 100. Direct LED backlight structure is shown as an example.

That is, the backlight unit according to the present invention has a plurality of LED printed circuit boards (PCB) 124 disposed on the lower cover 150 in parallel with each other, the predetermined predetermined on the LED printed circuit board 124 A plurality of LEDs (not shown) spaced apart from each other, a reflector 130 disposed between the LEDs and the LED printed circuit board 124 to reflect light generated from the LEDs, and the plurality of LEDs It is disposed in the optical sheet 140, such as a diffuser plate for diffusing and condensing the light generated from the LED.

In this case, the LED printed circuit board 124 may be composed of a metal core printed metal board (MPCB) in which an aluminum layer is laminated on a lower surface of the LED printed circuit board to radiate heat generated from the LED as a light source to the outside. .

In addition, although not shown in the drawing, the plurality of LEDs are mounted on the LED printed circuit board 124 and a driving unit printed circuit board on which driving components are mounted is configured in the form of another printed circuit board outside the LED backlight unit. do. However, the present invention is not limited thereto, and the present invention may be applied to a case in which a plurality of driving components for driving the LEDs are mounted together on the LED printed circuit board 124 on which the plurality of LEDs are mounted.

In addition, the liquid crystal display according to the present invention has a guide panel 151 which is mounted on the edge of the lower cover 150 to support the liquid crystal display panel 100 and an edge of the liquid crystal display panel 100 except for the screen display unit of the liquid crystal display panel 100. The upper case 155 is coupled to and coupled to the guide panel 151 and the lower cover 150 while covering.

4 is a plan view schematically illustrating an internal structure of the LED backlight unit according to the first embodiment of the present invention, and FIG. 5 is A of the LED backlight unit according to the first embodiment of the present invention shown in FIG. 4. It is a figure which shows roughly a cross section along line -A '.

As shown in the figure, the backlight unit according to the first embodiment of the present invention is a plurality of LED printed circuit board 124, parallel to each other disposed on the lower cover 150, on the LED printed circuit board 124 A plurality of LEDs 190 spaced apart at predetermined intervals, a reflector plate 130 disposed between the LEDs 190 and the LED printed circuit board 124 to reflect light generated from the LEDs 190, and It is disposed on the plurality of LED 190 and comprises an optical sheet (not shown), such as a diffusion plate for diffusing and condensing the light generated from the LED 190.

In this case, as described above, the LED printed circuit board 124 may be formed of a metal PCB in which an aluminum layer is laminated on a lower surface thereof to emit heat generated from the LED 190 as a light source to the outside.

Although not shown in the drawing, the plurality of LEDs 190 are mounted on the LED printed circuit board 124 and a driving unit printed circuit board on which driving components for driving the same is mounted on another printed circuit board outside the LED backlight unit. It may be configured in the form. However, the present invention is not limited thereto, and the present invention is a case where a plurality of driving parts for driving the LED 190 are mounted together on the LED printed circuit board 124 on which the plurality of LEDs 190 are mounted. Applicable to

At this time, the LED 190 according to the first embodiment of the present invention has been described an example in which one LED 190 that implements red, green, and blue is embedded in the LED lamp (or chip). The present invention is not limited thereto, and the present invention can be applied to a lamp in which all of the LEDs 190 implementing the red, green, and blue colors are built in, and this type is well mixed with the red, green, and blue colors. It can be implemented and has the advantage of improving the brightness.

In addition, in the first embodiment of the present invention has been described for example the LED 190 for implementing red, green and blue, the LED 190 is white or other than the red, green and blue depending on the purpose of use It can generate light of various colors. In addition, the LED 190 may generate light of different colors according to the purpose of use, or may be divided into a predetermined number of groups to generate light of different colors for each group.

The LED backlight unit according to the first embodiment of the present invention configured as described above has a predetermined diffuser plate supporter (DPS) between the reflective plate 130 and the diffuser plate to prevent sagging of the optical sheets. 170, the diffusion plate support member 170 may be made of a resin material such as polycarbonate (PC) to sufficiently prevent sagging of the optical sheets.

At this time, the diffusion plate support member 170 has a predetermined height to extend the cross-sectional area of the support portion 171 and the support portion 171 to support the diffusion plate to strengthen the coupling of the reflector plate 130 and the lower cover 150. Comprising a base portion 172 and a fastening portion 173 for fastening between the reflector plate 130 and the lower cover 150, the shape of the support portion 171 is shown at the bottom as shown to minimize the portion to be reflected It can be made in a conical shape with a cross-sectional area is reduced toward the top.

In addition, the reflector plate 130 is fastened to the lower cover 150 via the reflector plate fixing screw 180, while the LED printed circuit board 124 on which the LED 190 is mounted is used to fix the LED printed circuit board. The screw 185 is fastened to the lower cover 150.

Accordingly, the reflector plate 130 according to the first embodiment of the present invention corresponds to a through hole 160 through which the diffusion plate support member 170 penetrates and each LED 190 to expose the LED 190. A plurality of first screw holes 165 and second screw holes 166 for fastening the LED hole 162 and the LED printed circuit board fixing screw 185 and the reflector fixing screw 180 are formed. The manufacturing cost increases. In addition, the plurality of reflective plate fixing screw 180, the LED printed circuit board fixing screw 185, and the diffusion plate support member 170, such as a large amount of structure takes a lot of structure.

By fixing the reflector using a diffuser plate supporting member, the reflector fixing screw and the second screw hole are removed, and the LED printed circuit board fixing screw is covered with the reflecting plate to remove the first screw hole, thereby lowering the manufacturing cost of the reflecting plate. Price competitiveness of the LED backlight unit can be secured, which will be described in detail with reference to the second embodiment of the present invention.

6 is a plan view schematically illustrating an internal structure of a light emitting diode backlight unit according to a second embodiment of the present invention, and FIG. 7 is B of the light emitting diode backlight unit according to the second embodiment of the present invention shown in FIG. It is a figure which shows roughly a cross section along the line -B '.

As shown in the drawing, the backlight unit according to the second exemplary embodiment of the present invention includes a plurality of LED printed circuit boards 224 disposed on the lower cover 250 in parallel with each other, and on the LED printed circuit boards 224. A plurality of LEDs 290 spaced apart from each other at predetermined intervals, a reflecting plate 230 disposed between the LEDs 290 and the LED printed circuit board 224 to reflect light generated from the LEDs 290, and It is disposed on the plurality of LEDs 290 and comprises an optical sheet (not shown), such as a diffusion plate for diffusing and condensing the light generated from the LED 290.

In this case, as described above, the LED printed circuit board 224 may be formed of a metal PCB in which an aluminum layer is stacked on a lower surface thereof to emit heat generated from the LED 290 as a light source to the outside.

Although not shown in the drawings, the plurality of LEDs 290 are mounted on the LED printed circuit board 224, and a driving unit printed circuit board on which driving components for driving the same is mounted on another printed circuit board outside the LED backlight unit. It may be configured in the form. However, the present invention is not limited thereto, and the present invention is a case in which a plurality of driving parts for driving the LED 290 are mounted together on the LED printed circuit board 224 on which the plurality of LEDs 290 are mounted. Applicable to

The LED backlight unit according to the second embodiment of the present invention configured as described above includes a predetermined diffusion plate support member 270 between the reflective plate 230 and the diffusion plate to prevent sagging of the optical sheets. The diffusion plate support member 270 may be made of a resin material such as polycarbonate to sufficiently prevent sagging of the optical sheets.

At this time, the diffusion plate support member 270 has a predetermined height to extend the cross-sectional area of the support portion 271 and the support portion 271 for supporting the diffusion plate to strengthen the coupling of the reflector plate 230 and the lower cover 250. It consists of a base portion 272 and a fastening portion 273 for fastening between the reflector plate 230 and the lower cover 250, the shape of the support portion 271 is shown in the lower portion as shown to minimize the portion to be reflected It can be made in a conical shape with a cross-sectional area is reduced toward the top.

In addition, the reflective plate 230 is fastened to the lower cover 250 through the fastening portion 273 of the diffusion plate support member 270, while the LED printed circuit board 224 on which the LED 290 is mounted is The LED printed circuit board fixing screw 285 is fastened to the lower cover 250.

However, the reflective plate 230 according to the second embodiment of the present invention corresponds to a through hole 260 through which the diffusion plate support member 270 penetrates and each LED 290 to expose the LED 290. Only a plurality of LED holes 262 are formed, and unlike the first embodiment of the present invention, the reflective plate fixing screw is removed, and accordingly, the second screw hole and the LED printed circuit board fixing screw 285 are removed. ) Is characterized in that the first screw hole for fastening is not formed. That is, the reflector plate fixing screw is configured as the diffusion plate support member 270 to remove the reflector plate fixing screw and the second screw hole, and the LED printed circuit board fixing screw 285 is covered with the reflecting plate 230. By removing the first screw hole, it is possible to reduce the subsidiary materials.

By integrating the use of the reflector plate fixing screw and the diffusion plate support member 270 as described above, the LED material for fixing the LED printed circuit board fixing the LED printed circuit board 224 while reducing secondary materials and removing the second screw hole ( By covering the 285 with the reflecting plate 230 without opening the first screw hole, the manufacturing cost of the reflecting plate 230 can be improved by reducing the number of holes of the reflecting plate 230 as a whole.

For reference, reference numeral 265 'represents a screw hole formed in the LED printed circuit board 224 for fastening with the lower cover 250, and the screw 285 and the screw hole 265' for fixing the LED printed circuit board are The reflection plate 230 is covered and hidden.

Here, the LED backlight unit according to the first embodiment and the second embodiment of the present invention has to be designed in the same shape in order to improve the work efficiency and minimize the cost when assembling the LED printed circuit board LED structurally The part where the board | substrate fixing screw collects arises.

Currently, since a lot of screws for fixing the LED printed circuit board are gathered in the center of the liquid crystal display panel, the light reflected from the reflecting plate is relatively insufficient, which may appear dark on the surface of the liquid crystal display when the LCD is driven. That is, a screw mura may occur in the center of the liquid crystal display panel in which the screw for fixing the LED printed circuit board is distributed.

Therefore, in the third embodiment of the present invention, by removing the first screw hole and the second screw hole of the reflector, the fixing screw of the LED printed circuit board is replaced with a resin pin to prevent mura defects caused by the screw. This can be done, with reference to the following drawings will be described in detail.

8 is a plan view schematically illustrating an internal structure of a light emitting diode backlight unit according to a third embodiment of the present invention, and FIGS. 9A and 9B are diagrams illustrating a light emitting diode backlight according to the third embodiment of the present invention shown in FIG. 8. It is a figure which shows schematically the cross section along the C-C 'line of a unit.

9A illustrates a case where a part of the fixing screw of the LED printed circuit board is replaced with a resin pin, and FIG. 9B illustrates a case where the fixing screw of all the LED printed circuit boards is replaced with a resin pin. Is shown as an example.

As shown in the drawing, the backlight unit according to the third embodiment of the present invention includes a plurality of LED printed circuit boards 324 disposed on the lower cover 350 in parallel with each other, and on the LED printed circuit boards 324. A plurality of LEDs 390 spaced apart from each other at predetermined intervals, a reflecting plate 330 disposed between the LEDs 390 and the LED printed circuit board 324 to reflect light generated from the LEDs 390, and It is disposed on the plurality of LEDs 390 and comprises an optical sheet (not shown), such as a diffusion plate for diffusing and condensing the light generated from the LED 390.

In this case, as described above, the LED printed circuit board 324 may be formed of a metal PCB in which an aluminum layer is stacked on a lower surface thereof to emit heat generated from the LED 390 as a light source to the outside.

Although not shown in the drawings, the plurality of LEDs 390 are mounted on the LED printed circuit board 324, and a driving unit printed circuit board on which driving components for driving the same is mounted on another printed circuit board outside the LED backlight unit. It may be configured in the form. However, the present invention is not limited thereto, and the present invention is a case where a plurality of driving parts for driving the LED 390 are mounted together on the LED printed circuit board 324 on which the plurality of LEDs 390 are mounted. Applicable to

The LED backlight unit according to the third embodiment of the present invention configured as described above includes a predetermined diffusion plate support member 370 between the reflective plate 330 and the diffusion plate to prevent sagging of the optical sheets. The diffusion plate support member 370 may be made of a resin material such as polycarbonate to sufficiently prevent sagging of the optical sheets.

At this time, referring to FIG. 10A, the diffusion plate support member 370 has a predetermined height so that a cross-sectional area of the support part 371 and the support part 371 that supports the diffusion plate is extended to reflect the plate 330 and the lower cover 350. ) And a fastening part 373 that fastens the coupling between the reflector plate 330 and the lower cover 350, and the shape of the support part 371 is to minimize the visible portion. As shown in the figure, it may be formed in a conical shape in which the cross-sectional area decreases from the bottom to the top.

The reflective plate 330 is fastened to the lower cover 350 through the fastening portion 373 of the diffusion plate support member 370, and the LED printed circuit board 324 on which the LED 390 is mounted is The LED printed circuit board fixing screw 385 and the pins 375, 375a, and 375b are fastened to the lower cover 350.

In this case, the reflective plate 330 according to the third embodiment of the present invention corresponds to the through hole 360 through which the diffusion plate support member 370 penetrates and each LED 390 to expose the LED 390. Only a plurality of LED holes 362 are formed, and unlike the first embodiment of the present invention described above, the reflective plate fixing screw is removed, and accordingly, the second screw hole and the LED printed circuit board fixing screw 385 are removed. ) And the first screw hole for fastening the pins 375, 375a, and 375b is not formed. That is, the reflector plate fixing screw is constituted by the diffusion plate support member 370 to remove the reflector plate fixing screw and the second screw hole, and the LED printed circuit board fixing screw 385 and the pins 375, 375a, 375b may be covered with the reflective plate 330 to reduce the subsidiary materials by removing the first screw hole.

By integrating the use of the reflector plate fixing screw and the diffusion plate support member 370 in this way, it is possible to reduce the subsidiary materials and to remove the second screw hole, and to fix the LED printed circuit board fixing screw fixing the LED printed circuit board 324 ( By covering the 385 and the fins 375, 375a, and 375b with the reflecting plate 330 without opening the first screw hole, the manufacturing cost of the reflecting plate 330 may be improved by reducing the number of holes of the reflecting plate 330 as a whole.

For reference, reference numeral 365 ′ indicates a screw hole formed in the LED printed circuit board 324 for fastening with the lower cover 350, and the screw 385 and the pins 375, 375a, and 375b for fixing the LED printed circuit board. ) And the screw hole 365 'are covered by the reflector 330 and are hidden.

At this time, referring to Figure 10b, the LED printed circuit board fixing pins (375, 375a, 375b) has a size larger than the screw hole (365 ') is fixed to the upper portion of the LED printed circuit board 324 ( 376) and a fastening part 377 fastening between the LED printed circuit board 324 and the lower cover 350, and may be made of a resin material such as polycarbonate to prevent reflection of light.

Many details are set forth in the foregoing description but should be construed as illustrative of preferred embodiments rather than to limit the scope of the invention. Therefore, the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

124 ~ 324: LED printed circuit board 130 ~ 330: Reflector
150 ~ 350: Lower cover 160 ~ 360: Through hole
162 ~ 362: LED hole 165: first screw hole
166: second screw hole 170 to 370: diffusion plate support member
171 ~ 371: Support part 172 ~ 372: Base part
173 ~ 373: Fastening part 180: Screw for fixing LED printed circuit board
265 ', 365': screw hole
375,375a, 375b: Pins for Fixing LED Printed Circuit Board

Claims (14)

A plurality of LED printed circuit boards disposed on the lower cover in parallel to each other and fastened to the lower cover through fastening means;
A plurality of LEDs spaced at a predetermined interval on the LED printed circuit board;
A reflection plate disposed between the LED and the LED printed circuit board to reflect light generated from the LED;
An optical sheet such as a diffusion plate disposed on the plurality of LEDs to diffuse and collect light generated from the LEDs; And
A diffusion plate support member provided between the reflective plate and the diffuser plate to prevent sagging of the optical sheet and fastened to the lower cover through a fastening part, wherein the fastening means is covered and covered by the reflective plate. LED backlight unit. The LED backlight unit of claim 1, wherein the diffusion plate support member is made of a resin material such as polycarbonate. According to claim 1, wherein the diffusion plate support member has a predetermined height and the support portion for supporting the diffusion plate and the cross-sectional area of the support is extended to strengthen the coupling between the reflecting plate and the lower cover and between the reflecting plate and the lower cover LED backlight unit, characterized in that consisting of a fastening portion for fastening. The LED backlight unit of claim 1, wherein the reflector includes a plurality of through holes through which the diffusion plate support member penetrates, and a plurality of LED holes corresponding to each LED to expose the LEDs. The LED backlight unit of claim 1, wherein the fastening means comprises a screw. The LED backlight unit of claim 1, wherein the fastening means is made of a resin pin. The LED backlight unit of claim 1, wherein the fastening means is partly made of a screw and part is made of a resin pin. 8. The LED printed circuit board of claim 6, wherein the LED printed circuit board includes a screw hole formed for fastening with the lower cover, and the fastening means and the screw hole are covered and covered by the reflecting plate. LED backlight unit. The LED of claim 8, wherein the resin pin has a larger size than the screw hole, and includes a head fixed to an upper portion of the LED printed circuit board, and a fastening portion for fastening the LED printed circuit board to the lower cover. Backlight unit. A liquid crystal display panel in which pixels are arranged in a matrix form;
A plurality of LED printed circuit boards disposed on the lower cover in parallel to each other and fastened to the lower cover through fastening means;
A plurality of LEDs spaced at predetermined intervals on the LED printed circuit board to supply light to the liquid crystal display panel;
A reflection plate disposed between the LED and the LED printed circuit board to reflect light generated from the LED;
An optical sheet such as a diffusion plate disposed on the plurality of LEDs to diffuse and collect light generated from the LEDs; And
A diffusion plate support member provided between the reflective plate and the diffuser plate to prevent sagging of the optical sheet and fastened to the lower cover through a fastening part, wherein the fastening means is covered and covered by the reflective plate. LCD display device. The liquid crystal display device according to claim 10, wherein the fastening means is made of a resin pin. The liquid crystal display device according to claim 10, wherein the fastening means is partly made of a screw and part is made of a resin pin. The LED printed circuit board of claim 11, wherein the LED printed circuit board includes a screw hole formed for fastening with the lower cover, and the fastening means and the screw hole are covered and covered by the reflecting plate. A liquid crystal display device. The liquid crystal of claim 13, wherein the resin pin has a size larger than the screw hole, and includes a head fixed to an upper portion of the LED printed circuit board, and a fastening portion for fastening the LED printed circuit board to the lower cover. Display.
KR1020100032582A 2010-04-09 2010-04-09 Light emitting diode backlight unit and liquid crystal display device having the same KR20110113283A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120038166A (en) * 2010-10-13 2012-04-23 삼성전자주식회사 Liquid crystal display module and liquid crystal display device having the same
KR101326299B1 (en) * 2013-01-31 2013-11-11 삼성전자주식회사 Display module and displyay apparatus having the same
CN108594525A (en) * 2018-04-26 2018-09-28 惠州市华星光电技术有限公司 Support construction, backlight module and the display device of backlight module
US10642100B2 (en) 2017-12-20 2020-05-05 Lg Display Co., Ltd. Backlight unit
CN115061310A (en) * 2022-06-20 2022-09-16 Tcl华星光电技术有限公司 Backlight module and preparation method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120038166A (en) * 2010-10-13 2012-04-23 삼성전자주식회사 Liquid crystal display module and liquid crystal display device having the same
KR101326299B1 (en) * 2013-01-31 2013-11-11 삼성전자주식회사 Display module and displyay apparatus having the same
WO2014119904A1 (en) * 2013-01-31 2014-08-07 Samsung Electronics Co., Ltd. Display module and display apparatus having the same
US10642100B2 (en) 2017-12-20 2020-05-05 Lg Display Co., Ltd. Backlight unit
CN108594525A (en) * 2018-04-26 2018-09-28 惠州市华星光电技术有限公司 Support construction, backlight module and the display device of backlight module
CN115061310A (en) * 2022-06-20 2022-09-16 Tcl华星光电技术有限公司 Backlight module and preparation method thereof

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