KR20090119635A - Backlight unit - Google Patents

Abstract

The present invention, the lamp substrate is attached to the lamp; An inverter circuit board to which an inverter is attached; A first connection part including two or more coupling holes patterned to penetrate a part of the inverter circuit board; Two electrode parts connected to the inverter on one surface of the inverter circuit board and extending to an area where the first connection part is located; And a first connection part connected to two wires and a second connection part connected to the lamp substrate and coupled to the first connection part to connect the two wire parts to the two electrode parts.

Description

Backlight Unit

The present invention relates to a backlight unit.

With the development of information technology, the market for a display device, which is a connection medium between a user and information, is growing. Accordingly, flat panel displays (FPDs), such as liquid crystal displays (LCDs), organic light emitting diodes (OLEDs), and plasma display panels (PDPs), may be used. Usage is increasing. Among them, a liquid crystal display device capable of realizing high resolution and capable of large size as well as small size is widely used.

Here, the liquid crystal display device is classified into a light receiving display device. Such a liquid crystal display may receive an image from a backlight unit positioned under the liquid crystal panel to represent an image.

On the other hand, the backlight unit that provides light from the lower portion of the liquid crystal panel includes a lamp for emitting light and a lamp substrate to which the lamp is connected, an inverter circuit board for supplying voltage to the lamp substrate, and light emitted from the lamp to the liquid crystal panel. It may include a light guide plate and an optical film layer.

The lamp substrate and the inverter circuit board included in the conventional backlight unit have a structure that is electrically connected as the mail connector and the female connector are connected. In general, the female connector is attached to the inverter circuit board and the lamp board, and the male connector is attached to connect between the inverter circuit board and the lamp board. Here, the resistance to mechanical shock is one of the important characteristics because a high pressure of approximately 600V flows through the connector.

However, connectors applied to conventional backlight units are small in size and have a weak level of mechanical strength between the connectors after they are interconnected. In addition, two male connectors are attached to both sides of the wiring to connect the female connectors formed on the two boards, so that two pairs of connectors must be used, thereby increasing the number of processes, lowering the production yield, and increasing costs. do.

Therefore, the connection method applied to the conventional backlight unit needs an improvement method for solving the above problem.

An object of the present invention for solving the above problems of the background art, improve the structure of the connector connecting the lamp substrate and the inverter circuit board to increase the mechanical strength and simplify the process to improve the production yield as well as reduce the cost It is to provide a backlight unit that can be.

The present invention as a means for solving the above problems, the lamp substrate to which the lamp is attached; An inverter circuit board to which an inverter is attached; A first connection part including two or more coupling holes patterned to penetrate a part of the inverter circuit board; Two electrode parts connected to the inverter on one surface of the inverter circuit board and extending to an area where the first connection part is located; And a first connection part connected to two wires and a second connection part connected to the lamp substrate and coupled to the first connection part to connect the two wire parts to the two electrode parts.

The first connecting portion may be guided by a coupling hole included in the first connecting portion and may include a locking portion for locking the first connecting portion and the first connecting portion when the first connecting portion is coupled to the first connecting portion.

The first connection part may include a locking part to which the locking part included in the first connection part is engaged.

The patterned area of the coupling holes may be one or the same or different.

The locking part may be located on one surface of the first connection part or on a side surface of the first connection part.

The locking portion may be selected from one surface or the coupling hole between the coupling holes, and when the locking portion is selected as one of the coupling holes, some sides of one of the coupling holes may protrude more than the other side.

When the locking portion is selected as one of the coupling holes, the area of the coupling hole selected as the locking portion may be patterned wider than that of the other one.

The first connection part includes two connection electrodes connected to two wires and connected to two electrode parts, wherein the connection electrode is elastically movable when the first connection part and the first connection part are coupled or detached. have.

The first connection part may include a second connection part connected to the lamp substrate, and the second connection part may be formed in the same or different form as the first connection part.

When the shape of the second connection portion is the same as the first connection portion, the lamp substrate includes a second connection portion having the same shape as the first connection portion, and when the shape of the second connection portion is different from the first connection portion, the lamp substrate is different from the first connection portion. It may include a second connection of.

The present invention has the effect of improving the structure of the connector connecting the lamp substrate and the inverter circuit board to increase the mechanical strength and simplify the process to improve the production yield as well as to provide a backlight unit that can reduce the cost.

Hereinafter, with reference to the accompanying drawings, the specific content for the practice of the present invention will be described.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

As shown in FIG. 1, the liquid crystal display may include a backlight unit 176, a liquid crystal panel 183, and a driver 189. In addition, the upper case 190 and the lower case 170 may be included through the backlight unit 176, the liquid crystal panel 183, and the driving unit 189.

The lower case 170 may accommodate the backlight unit 176. The liquid crystal panel 183 may be disposed on the backlight unit 176 at a predetermined interval. The liquid crystal panel 183 and the backlight unit 176 may be fixed and protected by the upper case 190 fastened to the lower case 170. An opening for exposing an image display area of the liquid crystal panel 183 may be provided on an upper surface of the upper case 190.

The backlight unit 176 may include a lamp 171 for emitting light and an optical film layer for guiding light emitted from the lamp 171 to the liquid crystal panel 183.

The optical film layer may include a diffusion plate 172, a diffusion sheet 173, an optical sheet 174, and a protective sheet 175 positioned on the lamp 171. The optical sheet 174 may be, for example, a prism shape as shown, but may be positioned in a shape such as a lenticular lens or a micro lens. And such an optical sheet 174 may include a bead.

The liquid crystal panel 183 may have a structure in which the first substrate 110 having the thin film transistor array and the second substrate 180 having the color filter are bonded to each other with the liquid crystal layer interposed therebetween. In the liquid crystal panel 183, subpixels driven independently by a thin film transistor are arranged in a matrix form, and a difference between a common voltage supplied to each common pixel and a data signal supplied to a pixel electrode connected to the thin film transistor is provided. The image can be displayed by controlling the liquid crystal array in accordance with the voltage to adjust the light transmittance.

The driving unit 189 may be connected to the first substrate 110 of the liquid crystal panel 183. The driver 189 includes a plurality of flexible films 120 to which the first substrate 110 and one side are connected by mounting the data driver and the scan driver 130 to drive the data wires and the scan wires of the liquid crystal panel 183, respectively. And, it may include an external circuit board 188 connected to the other side of the plurality of flexible film (120).

The flexible film 120 having the data driver and the scan driver 130 mounted thereon may be located in a chip on film (COF) or tape carrier package (TCP) method. However, one or more of the data driver or the scan driver 130 may be directly mounted on the first substrate 110 by a chip on glass (COG) method or may be formed and embedded on the first substrate 110 in a thin film transistor forming process. Can be.

Hereinafter, the backlight unit 176 that provides light to the liquid crystal panel 183 will be described in more detail.

2 is a partial cross-sectional view of the backlight unit.

As shown in FIG. 2, the backlight unit may include a lamp substrate 140 to which the lamp 171 is attached. In addition, the inverter 155 may include an inverter circuit board 150 to which it is attached. In addition, the diffusion plate 172 may include a diffusion sheet (not shown), an optical sheet (not shown) and a protective sheet (not shown). Here, the lamp substrate 140 may be supported by the side supporter 178, but is not limited thereto.

In the case of the lamp 171 attached to the lamp substrate 140, a point light source such as an incandescent lamp or a white halogen lamp, or a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HCFL) ), A line light source such as an External Electrode Fluorescent Lamp (EEFL), or a surface light source such as an EL (Electroluminescent) or a Light Emitting Diode (LED) arranged in a matrix form. It is not limited.

The above-described structure of the lamp 171 may be selected from any one of an edge type in which the lamp is located on one side outside, a dual type in which the lamp is located on both sides, and a direct type in which a plurality of lamps are arranged in a straight line, but is not limited thereto. .

The inverter 155 attached to the inverter circuit board 150 may adjust the voltage supplied to the lamp 171, and further, may multi-drive the lamp 171.

Here, the dimming method for adjusting the voltage supplied to the lamp 171 includes a global dimming method for adjusting the brightness of the entire lamp 171 and local dimming for locally adjusting the brightness of a part of the lamp 171. There is a local dimming method. The global dimming method can improve the dynamic contrast measured between the previous frame and the next frame, and the local dimming method can improve the static contrast which is difficult to improve with the global dimming method. .

Here, when the lamp 171 attached to the lamp substrate 140 is selected as a surface light source capable of multi-driving, a plurality of inverters 155 located on the inverter circuit board 150 may be located.

Meanwhile, the lamp substrate 140 and the inverter circuit board 150 may be connected through two wires 161 and 162. Here, the two wires 161 and 162 are connected to the first connector 160 and the second connector 165, respectively, and the first connector 160 and the second connector 165 are respectively connected to the inverter circuit board 150. It may be coupled to the lamp substrate 140.

As such, when the inverter circuit board 150 and the lamp substrate 140 are electrically connected to each other through the first connection unit 160 and the second connection unit 165, the inverter circuit board 150 may be approximately connected to the inverter circuit board 150. The voltage having a phase difference of 180 ° may be supplied to the lamp substrate 140, whereby the lamp 171 may emit light to supply a light source to the liquid crystal panel.

Hereinafter, the connection structure of the lamp substrate 140 and the inverter circuit board 150 will be described in more detail.

3 is a diagram illustrating a connection structure according to an embodiment of the present invention, and FIG. 4 is a partial cross-sectional view of FIG. 3.

2 to 4, the inverter circuit board 150 included in the backlight unit includes at least two coupling holes 153a, 153b, and 153c patterned so that a part of the inverter circuit board 150 penetrates. It may include one connecting portion (153a, 153b, 153c). In addition, the inverter circuit board 150 is connected to the inverter 155 on one surface of the inverter circuit board 150 and extends to two electrode parts 151 and 152 extending to an area where the first connection parts 153a, 153b, and 153c are located. It may include.

On the other hand, the lamp substrate 140 and the inverter circuit board 150 may be connected through a wiring, for this purpose, the two wirings (161, 162) and two wirings (161, 162) connected to the lamp substrate 140 for this purpose The first connector 160 may include a first connector 160 connected to the first connectors 153a, 153b, and 153c to connect two wires 161 and 162 to the two electrode units 151 and 152.

The first connecting portion 160 may be guided by the coupling holes 153a, 153b, and 153c included in the first connecting portions 153a, 153b, and 153c to be coupled in a docking manner. In this case, the first connector 160 locks the first connector 160 and the first connectors 153a, 153b, and 153c when the first connector 160 is coupled to the first connectors 153a, 153b, and 153c. The locking unit may include a locking unit 167.

In addition, the first connector 160 has a sufficient distance between the two wires 161 and 162 and the two electrode parts 151 and 152 when the first connector 160 is coupled to the first connectors 153a, 153b, and 153c. It may include a rib 164 to be spaced apart with. In addition, the rib 164 may serve to allow the first connector 160 to have a bearing force from an external impact.

In addition, the first connection parts 153a, 153b, and 153c may include a locking part 153c to which the locking part 167 included in the first connection part 160 is engaged. The locking part 153c may be formed of any one of the coupling holes 153a, 153b, and 153c included in the first connection parts 153a, 153b, and 153c.

According to this structure, when the first connector 160 is docked to the first connector 153a, 153b, 153c of the inverter circuit board 150, the locking unit 167 included in the first connector 160 is It is locked by the locking portion 153c to have a strong fastening force.

Here, the locking portion 167 may be located on one surface of the first connecting portion 160, and the locking portion 167 and the corresponding locking portion 153c may be located on one surface between the coupling holes 153a and 153b. But it is not limited thereto.

When the inverter circuit board 150 and the first connection unit 160 are fastened as described above, the inverter circuit board 150 and the first connection unit 160 may be detached by pressing the locking unit 167 downward. have.

The patterned areas of the coupling holes 153a, 153b, and 153c included in the first connectors 153a, 153b, and 153c may differ by one or more. As such, when the pattern areas of the coupling holes 153a, 153b, and 153c are changed, the problem of misinsertion can be prevented.

The first connection unit 160 may include two connection electrodes connected to the two wires 161 and 162 and connected to the two electrode units 151 and 152.

In this regard, referring to FIG. 4, one of connection electrodes included in the first connection unit 160 is illustrated as “161a”. The illustrated connecting electrode 161a includes two electrode portions formed on the inverter circuit board 150 when the first connecting portion 160 is coupled to the first connecting portions 153a, 153b, and 153c of the inverter circuit board 150. It is electrically connected to one "151a".

Here, the connection electrode 161a included in the first connector 160 is axially moved in the vertical direction with elasticity when the first connector 160 and the first connectors 153a, 153b, and 153c are coupled or detached. Can be. In other words, in the process of docking the first connector 160 and the first connector 153a, 153b, and 153c, the connection electrode 161a is pushed by the thickness of the inverter circuit board 150 and axially moved upward. Thereafter, the electrode portion 151a formed on the inverter circuit board 150 has elasticity and is axially moved downward, and they are electrically connected to each other.

Meanwhile, when the inverter circuit board 150 and the first connection unit 160 are connected in the same manner as described above, a part connected to the lamp substrate 140 may also be combined with the same shape. Accordingly, the other side of the first connector 160 may include a second connector connected to the lamp substrate 140, and the second connector may be formed in the same shape as the first connector 160.

Therefore, when the shape of the second connection part is the same as the first connection part 160, the lamp substrate 140 may include a second connection part having the same shape as the first connection parts 153a, 153b, and 153c. Alternatively, the part connected to the lamp substrate 140 may be formed in another form. As such, when the shape of the second connection part is different from that of the first connection part 160, the lamp substrate 140 may include a second connection part having a different shape from the first connection parts 153a, 153b, and 153c.

Hereinafter, a connection structure that may be used in electrical connection between an inverter circuit board and a lamp board will be described with reference to a schematic connection perspective view and a rear view according to another embodiment of the present invention.

However, hereinafter, the relationship between the first connecting portion 153a, 153b, and 153c and the first connecting portion 153a, 153b, and 153c of the inverter circuit board 150 will be described in order to avoid duplication of explanation. Change the sign of the part to be described and only the modified part will be described.

5 is a schematic connection perspective view according to another embodiment of the present invention, Figure 6 is a rear view of FIG.

5 and 6, a portion of the first circuit 260 connected to the inverter circuit board 250 and the inverter circuit board 250 is illustrated.

According to another exemplary embodiment of the present invention, the inverter circuit board 250 may include first connection parts 253a, 253b, and 253c including two or more coupling holes 253a, 253b, and 253c. One or more patterned areas of the coupling holes 253a, 253b, and 253c may be different.

In addition, the first connector 260 may include ribs 264 positioned between the connection electrodes 261a and 262a to which two wires are connected, as in an exemplary embodiment of the present invention, and two or more coupling holes 253a may be provided. The locking portion 253c may be located in a large area of the patterned areas 253b and 253c. In this case, the locking part 267 docked to the locking part 253c may be positioned to correspond to the side surface of the first connection part 260.

Meanwhile, when the inverter circuit board 250 and the first connection unit 260 are connected in the same manner as described above, a part connected to the lamp substrate may also be combined with the same shape. Accordingly, the other side of the first connector 260 may include a second connector connected to the lamp substrate, and the second connector may be formed in the same shape as the first connector 260.

Therefore, when the shape of the second connector is the same as the first connector 260, the lamp substrate includes a second connector having the same shape as the first connector. Alternatively, however, the part connected to the lamp substrate may be formed in another shape. As such, when the shape of the second connection part is different from that of the first connection part 260, the lamp substrate may include a second connection part having a different shape from the first connection part.

7 is a schematic perspective view of a connection according to another embodiment of the present invention, and FIG. 8 is a rear view of FIG. 7.

7 and 8, a portion of the first connection unit 360 connected to the inverter circuit board 350 and the inverter circuit board 350 is shown.

According to another embodiment of the present invention, the inverter circuit board 350 may include a first connection part including two or more coupling holes, and the patterned area of the two or more coupling holes may be different.

In addition, the first connection part 360 may include a rib 364 positioned between a connection electrode to which two wires are connected, as in an embodiment of the present invention, and a patterned area of two or more coupling holes has a large area. The locking unit 367 may be located in correspondence with the. That is, in another embodiment of the present invention, the locking unit 367 may be located on the side of the first connection unit 360.

In addition, the inverter circuit board 350 may include a locking portion in one of the coupling holes in order to have a stronger tightening force. Some side surfaces of the coupling hole selected as the locking portion may have a locking portion 357 that protrudes more than the other side.

When the inverter circuit board 350 and the first connection unit 360 are fastened as described above, the inverter circuit board 350 and the first connection unit 360 can be detached by pressing the locking unit 367 in the lateral direction. have.

Meanwhile, when the inverter circuit board 350 and the first connection unit 360 are connected in the same manner as described above, a part connected to the lamp substrate may also be combined with the same shape. Accordingly, the other side of the first connection part 360 may include a second connection part connected to the lamp substrate, and the second connection part may be formed in the same shape as the first connection part 360.

Therefore, when the shape of the second connector is the same as the first connector 360, the lamp substrate includes the second connector having the same shape as the first connector. Alternatively, the part connected to the lamp substrate may be formed in another shape. As such, when the shape of the second connector is different from that of the first connector 360, the lamp substrate may include a second connector having a different shape from the first connector.

9 is a schematic perspective view of a connection according to another embodiment of the present invention, and FIG. 10 is a rear view of FIG. 9.

9 and 10, a portion of the first circuit 460 connected to the inverter circuit board 450 and the inverter circuit board 450 is illustrated.

According to another embodiment of the present invention, the inverter circuit board 450 may include a first connection part including two or more coupling holes, and the patterned area of the two or more coupling holes may be different.

In addition, the first connector 460 may include a rib 464 positioned between a connection electrode to which two wires are connected, as in an embodiment of the present invention, and a patterned area of two or more coupling holes is large. In response to the locking portion 467 may be located. That is, in another embodiment of the present invention, the locking unit 467 may be located on the side of the first connection unit 460.

In addition, the inverter circuit board 450 may include a locking portion in one of the coupling holes in order to have a stronger tightening force. Some side surfaces of the coupling hole selected as the locking portion may have a locking portion 457 protruding more than the other side.

In this case, when the inverter circuit board 450 and the first connection unit 460 are fastened, the inverter circuit board 450 and the first connection unit 460 can be detached by pressing the locking unit 467 in the lateral direction. have.

Meanwhile, when the inverter circuit board 450 and the first connection unit 460 are connected in the same manner as described above, a part connected to the lamp substrate may also be combined with the same shape. Accordingly, the other side of the first connector 460 may include a second connector connected to the lamp substrate, and the second connector may be formed in the same shape as the first connector 460.

Therefore, when the shape of the second connector is the same as the first connector 460, the lamp substrate includes the second connector having the same shape as the first connector. Alternatively, the part connected to the lamp substrate may be formed in another shape. As such, when the shape of the second connector is different from that of the first connector 460, the lamp substrate may include a second connector having a different shape from the first connector.

Each embodiment of the present invention improves the structure of the connector connecting the lamp substrate and the inverter circuit board to increase the mechanical strength and simplify the process to improve the production yield and the effect of providing a backlight unit that can reduce costs There is.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical configuration of the present invention described above may be modified in other specific forms by those skilled in the art to which the present invention pertains without changing its technical spirit or essential features. It will be appreciated that it may be practiced. Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all aspects. In addition, the scope of the present invention is shown by the claims below, rather than the above detailed description. Also, it is to be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention.

1 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

2 is a partial cross-sectional view of the backlight unit.

3 is a connection structure diagram according to an embodiment of the present invention.

4 is a partial cross-sectional view of FIG. 3.

5 is a schematic connection perspective view according to another embodiment of the present invention.

6 is a rear view of FIG. 5.

7 is a schematic connection perspective view according to another embodiment of the present invention.

8 is a rear view of FIG. 7.

9 is a schematic connection perspective view according to another embodiment of the present invention.

10 is a rear view of FIG. 9;

<Explanation of symbols on main parts of the drawings>

150, 250, 350, 450: inverter circuit boards 151, 152: two electrode parts

160, 260, 360, 460: first connection portions 161, 162: two wires

164, 264, 364, 464: rib 155: inverter

167, 267, 367, 467: locking section

Claims (10)

A lamp substrate to which a lamp is attached; An inverter circuit board to which an inverter is attached; A first connection part including two or more coupling holes patterned to penetrate a part of the inverter circuit board; Two electrode parts connected to the inverter on one surface of the inverter circuit board and extending to an area where the first connection part is located; And And a first connection part connected to the lamp substrate and two wires connected to the lamp substrate and coupled to the first connection part to connect the two wires to the two electrode parts. The method of claim 1, The first connection portion, Guided by the coupling hole included in the first connecting portion, And a locking unit configured to lock the first connection unit and the first connection unit when the first connection unit is coupled to the first connection unit. The method of claim 2, The first connection portion, And a catching part for catching the locking part included in the first connection part. The method of claim 1, The patterned area of the coupling hole, the backlight unit, characterized in that one or more equal or different. The method of claim 2, The locking unit, Located on one surface of the first connection portion, The backlight unit, characterized in that located on the side of the first connection. The method of claim 3, The locking portion, One surface between the coupling holes or one of the coupling holes, When the engaging portion is selected as one of the coupling holes Some side surface of one of the coupling holes protrude more than the other side. The method of claim 3, When the engaging portion is selected as one of the coupling holes The area of the coupling hole selected as the engaging portion is patterned wider than the other area. The method of claim 1, The first connection portion, Two connection electrodes connected to the two wires and connected to the two electrode units; The connection electrode, And the first connector and the first connector are elastically axially moved when the first connector and the first connector are coupled or detached. The method of claim 1, The first connection portion, A second connection part connected to the lamp substrate; And the second connector is formed in the same or different form as the first connector. The method of claim 9, When the shape of the second connection portion is the same as the first connection portion The lamp substrate includes a second connecting portion having the same shape as the first connecting portion, When the shape of the second connection portion is different from the first connection portion The lamp substrate may include a second connector different from the first connector.

Images