KR101385462B1 - Backlight unit and liquid cristal display device usimg the same - Google Patents

Abstract

The present invention relates to a backlight unit capable of reducing heat generation of a lamp electrode unit and a liquid crystal display using the same.

The backlight unit according to the present invention comprises: a plurality of lamps having first and second electrodes; A bottom cover to accommodate the plurality of lamps; First and second heat dissipation members contacting first and second electrode portions of the lamp corresponding to edges of the lamp including the electrodes to dissipate heat generated from the respective electrode portions; It comprises a first and second side support is provided on both sides of the bottom cover to cover each of the heat radiating member.

With this configuration, the present invention can improve the electro-optical characteristics of the liquid crystal due to the reduction of the electrode portion temperature, and can prevent thermal deformation of the apparatus due to the reduction of the electrode portion temperature.

Back light, Non-metallic material, Heat radiation member, Conductivity

Description

BACKLIGHT UNIT AND LIQUID CRISTAL DISPLAY DEVICE USIMG THE SAME}

1 is a view showing a backlight unit according to a first embodiment of the present invention.

2 is a view showing a heat radiation member according to a first embodiment of the present invention.

3 is a cross-sectional view of the backlight unit according to the first embodiment of the present invention.

4 is a diagram illustrating a backlight unit according to a second embodiment of the present invention;

5 is an enlarged view of an electrode part region according to a second exemplary embodiment of the present invention;

6 is a diagram illustrating a backlight unit according to a third embodiment of the present invention;

7 is an enlarged view of an electrode part region according to a third exemplary embodiment of the present invention.

8 illustrates a backlight unit according to a fourth embodiment of the present invention.

9 is an enlarged view of an electrode part region according to a fourth exemplary embodiment of the present invention.

10 illustrates a liquid crystal display according to an exemplary embodiment of the present invention.

Description of the Related Art [0002]

100: a plurality of lamps 102: first and second PCB

104: a plurality of lamp sockets 106: bottom cover

108: reflecting sheet 110a, 110b: first and second heat dissipation member

112a, 112b: first and second electrodes

114a, 114b: first and second side supports

116: diffuser plate 118: optical sheet

120a and 120b: first and second electrode portions

The present invention relates to a liquid crystal display, and more particularly, to a backlight unit capable of reducing heat generation of a lamp electrode unit and a liquid crystal display using the same.

Recently, various flat panel display devices that can reduce weight and volume, which are disadvantages of cathode ray tubes, have emerged. Examples of such flat panel display devices include a liquid crystal display, a field emission display, a plasma display panel, and a light emitting device.

The liquid crystal display device displays an image by adjusting the light transmittance of the liquid crystal using an electric field. To this end, the liquid crystal display includes a liquid crystal panel having a liquid crystal cell, a back light unit for irradiating light to the liquid crystal panel, and a driving circuit for driving the liquid crystal cell.

In this case, since the liquid crystal panel of the liquid crystal display device is a light-receiving element that displays an image by controlling the amount of light source coming from the outside, a backlight unit, which is a separate light source for irradiating light to the liquid crystal panel, is required. Such a backlight unit is divided into an edge method and a direct method according to the installed position.

The edge method is provided with a light source on the side of a light guide plate for guiding light, and is mainly applied to a relatively small liquid crystal display such as a monitor of a laptop computer and a desktop computer.

The direct type is provided with a plurality of lamps on the lower surface of the diffusion plate, and is mainly used for medium and large liquid crystal displays such as televisions.

As a light source of such a conventional backlight unit, a lamp is mainly used. As the liquid crystal display device becomes larger, the number of required light sources is increasing.

However, since the light source of the conventional backlight unit is turned on by the high-voltage AC voltage, high heat is generated in the electrode portion of the light source. In addition, when heat dissipation of heat generated from the light source is not smoothly performed, not only the structure supporting the lamp is deformed by the heat of the lamp, but also heat deformation of other parts occurs.

In addition, the conventional backlight unit has a problem in that the liquid crystal is degraded by heat to the lamp electrode portion, thereby reducing the electro-optical characteristics and reducing the reliability of the liquid crystal panel.

Accordingly, in order to solve the above problems, the present invention is to provide a backlight unit capable of reducing the heat generation of the lamp electrode unit and a liquid crystal display using the same.

According to an aspect of the present invention, there is provided a backlight unit comprising: a plurality of lamps having first and second electrodes; A bottom cover to accommodate the plurality of lamps; First and second heat dissipation members contacting first and second electrode portions of the lamp corresponding to edges of the lamp including the electrodes to dissipate heat generated from the respective electrode portions; It comprises a first and second side support is provided on both sides of the bottom cover to cover each of the heat radiating member.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

1 is a view showing a backlight unit according to a first embodiment of the present invention, Figure 2 is a view showing a heat radiation member according to a first embodiment of the present invention, and Figure 3 is a first embodiment of the present invention Cross-sectional view of the backlight unit according to the.

Referring to FIG. 1, a backlight unit according to a first embodiment of the present invention includes a plurality of lamps 100 having first and second electrodes 112a and 112b and a bottom for receiving a plurality of lamps 100. Corresponding to the edge of the lamp 100 including the cover 106, the first and second support portions 102a and 102b provided on both sides of the bottom cover 106, and the electrodes 112a and 112b. First and second heat dissipation members 110a and 110b that are in contact with the electrode portions 120a and 120b of the lamp 100 to dissipate heat generated by the electrode portions 120a and 120b, and each heat dissipation member 110a. And first and second side supports 114a and 114b installed on both sides of the bottom cover 106 to cover 110b.

Each of the plurality of lamps 100 is formed to have first and second electrodes 112a and 112b. In this case, the plurality of lamps 100 receives power from the first and second support parts 102a and 102b disposed on both sides of the bottom cover 106. To this end, the plurality of lamps 100 may be any one of an External Electrode Fluorescent Lamp (EEFL), a Cold Cathode Fluorescent Lamp (CCFL), an External Internal Fluorescent Lamp (EIFL), and a Hot Cathode Fluorescent Lamp (HCFL).

The bottom cover 106 houses a plurality of lamps 100. Here, the bottom cover 106 is open at both sides so that the first and second support portions 102a and 102b contacting the electrodes 112a and 112b of each lamp may be seated. At this time, the first and second side supports 114a and 114b are provided on both sides of the opening. In addition, a reflective sheet 108 is attached to the side and bottom surfaces of the bottom cover 106 to reflect light from the plurality of lamps 100 toward the diffuser plate 114. Here, the reflective sheet 108 may not be attached to portions corresponding to the first and second support portions 102a and 102b.

The first and second support portions 102a and 102b are provided with substrates 105a and 105b mounted on the bottom cover 106 and the electrode portions 120a and 120b of the lamp 100 to be detachably mounted. And a plurality of sockets 104 installed at 105b.

The substrates 105a and 105b are provided on both sides of the opened bottom cover 106. In this case, a common power line (not shown) formed on the substrates 105a and 105b is electrically connected to the plurality of lamp sockets 104.

Each of the plurality of lamp sockets 104 is formed such that the plurality of lamps 100 are easily detachable. In this case, the plurality of lamp sockets 104 supplies power to drive the plurality of lamps 100.

As shown in FIG. 2, the first and second heat dissipation members 110a and 110b may include the first and second heat dissipation members 110a and 110b. The first and second electrode portions 120a and 120b are in contact with each other to dissipate heat generated in the electrode portions 120a and 120b. In this case, the first and second heat dissipation members 110a and 110b include grooves into which the first and second electrode portions 120a and 120b of the respective lamps 100 are inserted. Here, the first and second heat dissipation members 110a and 110b transfer heat of the respective sockets 104 and the substrates 105a and 105b to the first and second side supports 114a and 114b.

To this end, the first and second heat dissipation members 110a and 110b are formed of a nonmetallic material having a higher thermal conductivity than air. Here, the non-metallic material having a higher thermal conductivity than air may include aluminum oxide, sapphire aluminum oxide, polycrystalline, beryllium oxide, boron, carbon, Graphite, Pyroceram, Silicon Carbide, Silicon Carbide, Silicon Dioxide, Silicon Nitride, Sulfur, Thorium Dioxide, Titanium Dioxide ) Or formed of at least two mixed materials.

As shown in FIG. 3, the first side support 114a is installed at one edge of the bottom cover 106 to cover the heat dissipation member 110a and the first electrode portion 120a of the lamp 100. In this case, the first side support 114a includes a groove into which the first electrode part 120a of each lamp 100 is inserted. The first side support 114a dissipates heat transferred from the first electrode part 120a.

The second side support 114b is installed at one edge of the bottom cover 106 to cover the heat dissipation member 110b and the second electrode portion 120b of the lamp 100. In this case, the second side support 114b includes a groove into which the first electrode part 120b of each lamp 100 is inserted. The second side support 114b dissipates heat transferred from the second electrode part 120b.

The diffuser plate 116 is laminated to the front opening of the bottom cover 106 on the first and second side supports 114a and 114b. In this case, a plurality of protrusions (not shown) may be installed at the central portion of the bottom cover 106 to prevent sagging of the diffusion plate 116. The diffusion plate 116 diffuses the light emitted from the plurality of lamps 100.

The plurality of optical sheets 118 are composed of two prism sheets 118a and 118b for condensing the light diffused by the diffuser plate 116.

The backlight unit according to the first embodiment transmits heat generated from the electrode parts 120a and 120b of the lamp 100 to the side supports 114a and 114b through the heat dissipation members 110a and 110b to radiate heat. Due to the temperature decrease of the electrode parts 120a and 120b, thermal deformation of the apparatus may be prevented.

In the backlight unit according to the first embodiment of the present invention described above, each of the first and second support units 102a and 102b has a lamp connection structure connected to an external inverter (not shown) through the socket 104. Have

However, the lamp connection structure can be connected via clips, substrates and wires in addition to the sockets described above.

4 is a view illustrating a backlight unit according to a second exemplary embodiment of the present invention and illustrates a lamp connection structure using a substrate. 5 is an enlarged view of an electrode part region according to a second exemplary embodiment of the present invention.

First, since the backlight unit according to the second embodiment of the present invention has the same configuration as the first embodiment of the present invention except for the lamp connection structure of the first and second supporting parts, the description of the same configuration will be omitted. The description will be replaced with the above description.

As shown in FIGS. 4 and 5, the first and second support portions may include substrates 202a and 202b disposed perpendicular to the bottom cover 106 to face the electrode portions 220a and 220b of the lamp 200. And a plurality of holes 208 formed in each of the substrates 202a and 202b so that the electrode portions 220a and 220b of each lamp 200 are inserted, and each electrode of the lamp 200 penetrating each of the holes 208. The solder part 226 for fixing the parts 220a and 220b to each board | substrate 202a and 202b is comprised.

The substrates 202a and 202b are disposed perpendicular to the bottom cover 106 to face the electrode portions 220a and 220b of the lamp 200. In this case, the substrates 202a and 202b support the plurality of lamps 200.

The holes 208 are formed in the substrates 202a and 202b so that the electrode portions 220a and 220b of the lamps 200 are inserted. In this case, the holes 208 are formed such that each of the substrates 202a and 202b can be connected to the external lead wire 224 and the solder portion 226.

The solder portion 226 forms the electrode portions 220a and 220b of the lamp 200 passing through the holes 206 to be fixed to the substrates 202a and 202b, respectively. At this time, the solder portion 226, as shown in Figure 5, the common power line (not shown) formed on the external lead wire 224 extending from the electrode 222 in the lamp 200 and the substrates (202a, 202b) Is electrically connected to

FIG. 6 is a view illustrating a backlight unit according to a third embodiment of the present invention, and illustrates a lamp connection structure using a clip. 7 is an enlarged view of an electrode part region according to a third exemplary embodiment of the present invention.

First, the backlight unit according to the third embodiment of the present invention has the same configuration as that of the first embodiment of the present invention except for the lamp connection structure of the first and second support parts, and thus the description of the same configuration will be described. The description will be replaced with the above description.

As shown in FIGS. 6 and 7, the first and second support portions are provided on the first and second substrates 302a and 302b disposed on both sides of the bottom cover 106, and on the respective substrates 302a and 302b. And an integrated socket portion B commonly connected to each of the electrode portions 320a and 320b of the lamp 300.

The first and second substrates 302a and 302b are disposed at both sides of the bottom cover 106. At this time, the integrated socket portion B is provided on the first and second substrates 302a and 302b to support the plurality of lamps 300.

The integrated socket portion B is commonly connected to the electrode portions 320a and 320b of each lamp 300. In this case, as shown in FIG. 7, the integrated socket part B includes a plurality of clips 308 to which the electrode parts 320a and 320b of each lamp 300 are detachably mounted.

As shown in FIG. 7, the plurality of clips 308 are formed to surround the electrodes 322 outside the lamps 300. In this case, the plurality of clips 308 supplies power to the plurality of fixed lamps 300.

FIG. 8 is a view illustrating a backlight unit according to a fourth embodiment of the present invention and illustrates a lamp connection structure using a lamp holder. 9 is an enlarged view of an electrode part region according to a fourth exemplary embodiment of the present invention.

First, the backlight unit according to the fourth embodiment of the present invention has the same configuration as that of the first embodiment of the present invention except for the connection structure using the lamp holders of the first and second support parts. The description will be replaced by the above description.

As shown in FIGS. 8 and 9, the first and second supporting portions are electrically connected to the plate 402 for supporting the plurality of lamps 400 and the electrode portions 420a and 420b of the respective lamps 400. It comprises a plurality of wires 416 connected to each other, and a plurality of lamp holders 410 surrounding each of the wires 416 and the electrode portions 420a and 420b of the lamp 400.

The plate 402 is formed to support the plurality of lamps 400. In this case, grooves (not shown) may be formed in the plate 402 to accommodate both ends of each lamp 400.

As shown in FIG. 9, each of the plurality of lamps 400 may allow both electrodes of the lamps 400 to be seated on a plate 402 having a plurality of grooves (not shown). Is formed. Here, each lamp 400 is connected to an electrode 422 formed at both ends, an internal lead wire 412 for applying a voltage to the electrode 422 inside the tube, and an internal lead wire 412 to apply a voltage from the outside. It consists of an external lead wire (not shown). The external lead wire is connected to an inverter (not shown) provided on the rear surface of the plate 402.

Each of the lamp holders 410 is formed to fix and support the lamp 400 to the plate 402, as shown in FIG. 9. Here, the lamp holder 410 is formed to cover the area where the two electrodes 400 of the lamp electrode 420 is formed in pairs. At this time, the lamp holder 410 may be formed of the same material as the heat radiation member of the present invention.

10 is a diagram illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 10, a liquid crystal display according to an exemplary embodiment of the present invention includes a backlight unit 500, a liquid crystal panel 520, a panel guide 530, and a top cover 540.

The backlight unit 500 is formed of a backlight unit according to the first to fourth embodiments of the present invention as shown in FIGS. 1 to 9.

The liquid crystal panel 520 includes a transistor array substrate and a color filter array substrate bonded to each other, a spacer (not shown) for maintaining a constant cell gap between the two array substrates, and a liquid crystal layer filled in the liquid crystal space provided by the spacer. It is configured to include (not shown). At this time, the liquid crystal panel 520 displays an image by adjusting the light transmittance of the liquid crystal.

The color filter array substrate includes a color filter, a common electrode, a black matrix, and the like. Here, the common electrode may be formed on the transistor array substrate.

The transistor array substrate is formed in a region defined by a plurality of data lines (not shown) and a plurality of gate lines (not shown), and is connected to a thin film transistor (not shown) connected to the gate line and the data line, and connected to the thin film transistor. It is configured to include a liquid crystal cell (not shown).

The panel guide 530 is stacked on the bottom cover 106, and the top cover 540 having a rectangular frame shape that borders the edge of the liquid crystal panel 520 is assembled to the panel guide 530 and the bottom cover 106. .

The top cover 540 surrounds the front edge of the liquid crystal panel 520 and the side of the bottom cover 106 disposed on the bottom cover 106. To this end, the top cover 540 includes a non-display area except for the display area of the liquid crystal panel 520, that is, a flat part covering the edge and a side part bent vertically from the flat part to surround the side of the bottom cover 106. It is configured by.

As described above, the liquid crystal display using the backlight according to the first exemplary embodiment of the present invention improves the electrical and optical characteristics of the liquid crystal due to the decrease in the electrode temperature, and prevents the thermal deformation of the apparatus due to the decrease in the electrode temperature. have.

The liquid crystal display device is not limited to the backlight unit according to the first embodiment of the present invention, but may be applied to the backlight units according to the second to fourth embodiments.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Will be apparent to those of ordinary skill in the art.

As described above, the backlight unit and the liquid crystal display using the same improve the electrical and optical characteristics of the liquid crystal due to the decrease in the electrode temperature, and thermal deformation of the apparatus due to the decrease in the electrode temperature. You can stop it.

Claims (10)

A plurality of lamps having first and second electrodes; A bottom cover to accommodate the plurality of lamps; First and second heat dissipation that directly contact the first and second electrode portions of the lamp corresponding to the edges of the lamp including the first and second electrodes to dissipate heat generated from the first and second electrode portions. Absence; First and second side supports provided on both sides of the bottom cover to cover the first and second heat dissipation members; A first and a second support part disposed on both sides of the bottom cover so as to be covered by the first and second heat dissipation members to supply and support power to the first and second electrode parts of each lamp; Each of the first and second supports A plurality of wires electrically connected to the first and second electrode portions of the lamp; A plurality of lamp holders surrounding each of the wires and the first and second electrode portions of the lamps; And each lamp holder covers a pair of first electrode parts or second electrode parts of a neighboring lamp. delete delete delete delete delete delete The method of claim 1, The first and second heat dissipation members may include aluminum oxide, sapphire aluminum oxide, polycrystalline, beryllium oxide, boron, carbon, graphite, and graphite. (Graphite), Pyroceram, Silicon Carbide, Silicon Carbide, Silicon Dioxide, Silicon Nitride, Sulfur, Thorium Dioxide, Titanium Dioxide backlight unit, characterized in that the material of any one or at least two materials. A liquid crystal panel which displays an image by adjusting light transmittance; A liquid crystal display device comprising any one of the backlight units of claim 1 and 8 for irradiating light to the liquid crystal panel. 10. The method of claim 9, A panel guide disposed on a bottom cover to support the liquid crystal panel; And a top cover surrounding the front edge of the liquid crystal panel and the side surfaces of the panel guide and the bottom cover.

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