KR101528932B1 - Liquid Crystal Display Device - Google Patents

Abstract

An embodiment of the present invention is a liquid crystal display device comprising: a liquid crystal panel; A cover bottom supporting the liquid crystal panel; A circuit board on which light emitting portions for providing light to the liquid crystal panel are mounted; A light guide plate for guiding the light emitted from the light emitting portion to the liquid crystal panel; And a fixing unit inserted through the via holes formed in the bottom surface and the side surface of the cover bottom and fixing the one side of the circuit board on which the light emitting units are mounted and the outer side of the cover bottom to fix the circuit board on the inner side surface of the cover bottom. A display device is provided.

Liquid crystal display, backlight unit, fixed

Description

[0001] The present invention relates to a liquid crystal display device,

An embodiment of the invention relates to a liquid crystal display device.

As the information technology is developed, the market of display devices, which is a connection medium between users and information, is getting larger. Accordingly, a flat panel display (FPD) such as a liquid crystal display (LCD), an organic light emitting diode (OLED), and a plasma display panel (PDP) Usage is increasing.

Of the above flat panel display devices, liquid crystal display devices are widely used because they can realize high resolution and can be miniaturized as well as large-sized. A liquid crystal display device is classified as a light-receiving-type display device using light provided from a backlight unit located under the liquid crystal panel. Such a liquid crystal display device is roughly composed of a thin film transistor array substrate and a color filter substrate. In the thin film transistor array substrate, sub-pixels including a gate, a semiconductor layer, a thin film transistor including a source and a drain, a pixel electrode for applying an electric field to the liquid crystal layer, and a common electrode are formed. A color filter and a black matrix are formed on the color filter substrate.

Meanwhile, in the conventional liquid crystal display device, in order to attach and fix the circuit board on which the light emitting portions are formed when the backlight unit is assembled to the cover bottom, an auxiliary board for assembly is formed between the circuit board and the cover bottom, . However, there is a problem in routing the wiring for supplying power to the light emitting portion when designing the circuit board in the structure for forming the assembly groove on the circuit board. The structure using the auxiliary board for assembly is not limited to the circuit board, There is a problem that the space occupied by the substrate is widened, and it is required to provide a measure to improve the problem.

The embodiments of the present invention for solving the above-described problems of the background art use a fixing part having a convenient and rigid coupling structure when assembling the backlight unit part, and it is easy to assemble and space saving, And it is an object of the present invention to provide a liquid crystal display device capable of solving the difficulty of designing when routing a wiring for supplying light.

According to an embodiment of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel; A cover bottom supporting the liquid crystal panel; A circuit board on which light emitting portions for providing light to the liquid crystal panel are mounted; A light guide plate for guiding the light emitted from the light emitting portion to the liquid crystal panel; And a fixing unit inserted through the via holes formed in the bottom surface and the side surface of the cover bottom and fixing the one side of the circuit board on which the light emitting units are mounted and the outer side of the cover bottom to fix the circuit board on the inner side surface of the cover bottom. A display device is provided.

The fixing portion includes first and second diagonal fixing portions which are located on the inner surface of the cover bottom and are inserted through the via holes to press one surface of the circuit board and second fixing portions which are located on the outer surface of the cover bottom and are engaged with the first fixing portions And may include fixed portions.

The fixing portion may include projections protruding from the surface and located at the ends of the first fixing portions and latch portions formed in the groove of the second fixing portions.

The fixing portion may include fixing grooves formed on the upper end surfaces of the first fixing portions and protrusions protruding from the surfaces of the second fixing portions and fixed in the fixing grooves.

The fixing portion may include fixing grooves formed on the upper end surface of the first fixing portions, fixing holes formed in the second fixing portions, and fixing screws inserted into the fixing grooves through the fixing holes.

The fixing screw portions may be screws for fitting and fixing the first fixing portions and the second fixing portions.

The shape of the second fixing portions may be a square.

According to another aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel; A cover bottom supporting the liquid crystal panel; A circuit board on which light emitting portions for providing light to the liquid crystal panel are mounted; A light guide plate for guiding the light emitted from the light emitting portion to the liquid crystal panel; A fixing portion including a first fixing surface slidably inserted along a passage formed on a bottom surface and a side surface of the cover bottom and covering an outer surface of the cover bottom, and a second fixing surface covering one surface of the circuit board on which the light emitting portions are mounted; And a circuit board and a cover bottom positioned between the first fixing surface and the second fixing surface in the direction of the first fixing surface so that the circuit board is fitted and fixed to the inner surface of the cover bottom, A liquid crystal display device including a pressing portion is provided.

The pressing portion may be a screw.

The first fixing surface may include an upper fixing surface that covers the upper surface of one side of the circuit board and a lower fixing surface that covers the lower surface of the one side of the circuit board.

Embodiments of the present invention can be applied to a backlight unit using a fixing unit having a convenient and rigid connection structure when assembling a backlight unit, It is possible to solve the difficulty of the liquid crystal display device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

≪ Embodiment 1 >

FIG. 1 is a partial cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view of a liquid crystal panel.

1, the liquid crystal display according to the first embodiment of the present invention includes a liquid crystal panel 110, optical sheets 140, a cover bottom 160, a circuit board 170, a light guide plate 180, And a fixing portion 190.

The liquid crystal panel 110 may have a structure in which a first substrate 110a on which a thin film transistor is formed and a second substrate 110b on which a color filter is formed are bonded together with a liquid crystal layer Cl therebetween. The alignment layer may be positioned on the first substrate 110a and the second substrate 110b according to the characteristics of the liquid crystal layer Cl. On the upper and lower surfaces of the liquid crystal panel 110, a polarizer 120 for polarizing light incident on the liquid crystal panel 110 and light emitted therefrom is attached.

Hereinafter, the structure of the liquid crystal panel 110 will be described in more detail with reference to FIG.

A gate 151 may be positioned on one surface of the first substrate 110a. The gate 151 may be formed of any one selected from the group consisting of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper Or an alloy thereof. The gate 151 may be formed of a material selected from the group consisting of Mo, Al, Cr, Au, Ti, Ni, Ne, And may be a multilayer composed of any one selected or an alloy thereof. Further, the gate 151 may be a double layer of molybdenum / aluminum-neodymium or molybdenum / aluminum.

The first insulating layer 152 may be located on the gate 151. The first insulating layer 152 may be a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or a multilayer thereof, but is not limited thereto.

The active layer 154a may be located on the first insulating layer 152 in a region corresponding to the gate 151 and the ohmic contact layer 154b may be located in the active layer 154a have. The data line 153 to which the data voltage is supplied may be located on the first insulating layer 152, but the present invention is not limited thereto.

A source 155a and a drain 155b may be positioned on the active layer 154a. The source 155a and the drain 155b may be formed of a single layer or multiple layers and may be formed of a single layer such as molybdenum (Mo), aluminum (Al), chromium (Cr) And may be made of any one selected from the group consisting of gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu) When the source 155a and the drain 155b are multilayered, they may be formed of a triple layer of molybdenum / aluminum-neodymium, molybdenum / aluminum / molybdenum or molybdenum / aluminum-neodymium / molybdenum.

The second insulating film 156 may be located on the source 155a and the drain 155b. The second insulating film 156 may be a silicon oxide film (SiOx), a silicon nitride film (SiNx), or a multilayer thereof, but is not limited thereto. The second insulating film 156 may be a passivation film.

The pixel electrode 157 connected to the source 155a or the drain 155b may be positioned on the second insulating layer 156. [ The pixel electrode 157 may be formed of a transparent electrode such as indium tin oxide (ITO), indium zinc oxide (IZO), or zinc oxide (ZnO).

A common electrode (not shown) may be formed on the second insulating layer 156 to face the pixel electrode 157. The common electrode may be positioned on the first substrate 110a or the second substrate 110b.

A spacer 158 may be positioned on the second insulating layer 156 on the first substrate 110a and corresponding to the source 155a and the drain 155b to maintain a cell gap with the second substrate 110b. have.

A black matrix BM may be disposed on one surface of the second substrate 110b. The black matrix BM may be positioned so as to correspond to an area where the spacer 158 is located as a non-display area.

The black matrix (BM) may be formed of a photosensitive organic material to which black pigment is added, and carbon black, titanium oxide, or the like may be used as the black pigment.

Color filters (CFR, CFG, CFB) may be located between the black matrixes BM. The color filters CFR, CFG, and CFB may have different colors as well as red (CFR), green (CFG), and blue (CFB).

An overcoat layer 159 may be placed on the black matrix (BM) and the color filters (CFR, CFG, CFB). On the other hand, the second substrate 150b on which the black matrix BM and the color filters CFR, CFG and CFB are formed may be omitted from the overcoat layer 159 according to the structure.

Here, although not shown, the first substrate 110a may include a driving unit including a scan driver for supplying a driving signal and a data driver. The driving unit is connected to the data line 153 formed on the first substrate 110a constituting the liquid crystal panel 110 and the gate line. The driving circuit can be connected to the liquid crystal panel 110 by a film circuit (COF) or a tape carrier package (TCP) method. However, the driving unit may be directly mounted on the first substrate 110a by a COG (Chip On Glass) method or may be formed on the first substrate 110a in the thin film transistor forming process.

The liquid crystal panel 110 thus formed can display an image on each sub-pixel according to a scan signal supplied through the gate lines and a data voltage supplied through the data lines. Here, the scan signal may be a pulse signal that alternates between a gate high voltage supplied during one horizontal time period and a gate low voltage supplied during the remaining time, but is not limited thereto.

On the other hand, the thin film transistor included in the subpixel may be turned on when a gate high voltage is supplied from the gate wirings to supply the data voltage applied from the data wirings to the liquid crystal layer Cl. Accordingly, when the thin film transistor of each sub pixel is turned on and the data voltage is applied to the pixel electrode 157, the liquid crystal panel 110 is charged with the difference voltage between the data voltage and the common voltage, Can be displayed. On the contrary, when the gate line voltage is supplied from the gate lines, the data voltage charged in the liquid crystal layer Cl can be maintained by the storage capacitor for one frame period while the thin film transistor is turned off. The liquid crystal panel 110 may repeat different operations depending on the scan signals supplied through the gate wirings.

The cover bottom 160 supports the liquid crystal panel 110 and has a structurally bent step to accommodate the optical sheets 140, the reflecting unit 130, the circuit board 170, the light guide plate 180, . A guide panel top 165 may be attached to the cover bottom 160 to support the liquid crystal panel 110. The cover bottom 160 includes via holes HL formed on the bottom surface and the side surface.

The optical sheets 140 may include a diffusion plate, a diffusion sheet, a prism sheet, and a protective sheet so as to efficiently provide the light emitted from the light emitting units 175 to the liquid crystal panel 110. However, It does not. The light guide plate 180 may be positioned adjacent to the light emitting portions 175 mounted on the circuit board 170 to guide the light emitted from the light emitting portions 175 to the liquid crystal panel 110 . The reflector 130 may be positioned on the bottom surface of the cover bottom 160 to increase the utilization of light guided by the light guide plate 180, but the present invention is not limited thereto.

The circuit board 170 includes light emitting portions 175 mounted on one surface thereof to provide light to the liquid crystal panel 110. [ The circuit board 170 is provided with wiring routed so that power supplied from the outside is supplied to the light emitting portions 175. The light emitting units 175 mounted on one surface of the circuit board 170 may be formed of light emitting diodes, but the present invention is not limited thereto.

The fixing portion 190 is inserted through the via holes HL formed on the bottom surface and the side surface of the cover bottom 160 and is formed on one side of the circuit board 170 on which the light emitting portions 175 are mounted, So that the circuit board 170 can be fixedly attached to the inner surface of the cover bottom 160.

Hereinafter, the fixing unit 190 will be described in more detail with reference to the drawings.

FIG. 3 is a view showing a fixing part and a circuit board, and FIG. 4 is a view showing a fixing part according to the first embodiment of the present invention.

1 to 4, the fixing portion 190 is disposed on the inner surface of the cover bottom 160 and has a first diagonal shape, which is inserted through the via holes HL to press one surface of the circuit board 170, And may include fixing portions 191 and second fixing portions 195 which are located on the outer surface of the cover bottom 160 and are fixedly coupled to the first fixing portions 191. 3 (a) is a plan view of the fixing portion 190 coupled to press the circuit board 170, and FIG. 3 (b) is a perspective view of the fixing portion 190 As shown in FIG.

The fixing portion 190 is provided at the end of the first fixing portions 191 and includes protrusions 192 protruding from the surface and locking portions 196 formed in the groove HM of the second fixing portions 195. [ . As described above, the shape of the first fixing portions 191 may be diagonally shaped, and the shape of the second fixing portions 195 may be rectangular, but is not limited thereto.

The first fixing portions 191 cover the one surface of the circuit board 170 on which the light emitting portions 175 are mounted and the cover bottom 160 (Not shown). The second fixing portions 195 are attached to the outer surface of the cover bottom 160 and at the same time the protrusions 192 formed on the first fixing portions 191 are engaged with the grooves HM of the second fixing portions 195 And hooked on the engaging portions 196 formed inside the groove HM. Thus, the circuit board 170 can be fixedly attached to the inner surface of the cover bottom 160 by the engagement structure of the fixing portion 190.

As the coupling structure of the fixing portion 190 is the same as this, it is possible to have a more convenient and rigid coupling structure than the structure in which the screws are fixed through the circuit board 270 or fixed through the auxiliary substrate for assembly as in the conventional case. Accordingly, the embodiment can solve the difficulty in routing the wiring for supplying power to the light emitting parts 175 in the design of the circuit board 170, and advantageously does not require the use of the auxiliary board for assembly have. In addition, the embodiment can adjust the depth of coupling between the protrusions 192 and the engaging portions 196 included in the fixing portion 190, as well as reduce the easiness of detachment.

≪ Embodiment 2 >

5 is a partial cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.

5, the liquid crystal display according to the second embodiment of the present invention includes a liquid crystal panel 210, optical sheets 240, a cover bottom 260, a circuit board 270, a light guide plate 280, And a fixing portion 290.

The liquid crystal panel 210 may have a structure in which a first substrate 210a on which a thin film transistor is formed and a second substrate 210b on which a color filter is formed are bonded together with a liquid crystal layer Cl therebetween. The alignment layer may be positioned on the first substrate 210a and the second substrate 210b according to the characteristics of the liquid crystal layer Cl. A polarizer 220 is attached to the upper and lower surfaces of the liquid crystal panel 210 to polarize the light incident on the liquid crystal panel 210 and the incident light.

The cover bottom 260 supports the liquid crystal panel 210 and has a structurally bent step to accommodate the optical sheets 240, the reflector 230, the circuit board 270, the light guide plate 280, . A guide panel top 265 may be attached to the cover bottom 260 to support the liquid crystal panel 210. The cover bottom 260 includes via holes HL formed on the bottom surface and side surfaces thereof.

The optical sheets 240 may include a diffusion plate, a diffusion sheet, a prism sheet, and a protective sheet so as to efficiently supply the light emitted from the light emitting units 275 to the liquid crystal panel 210. However, It does not. The light guide plate 280 may be positioned adjacent to the light emitting portions 275 mounted on the circuit board 270 to guide the light emitted from the light emitting portions 275 to the liquid crystal panel 210 . The reflector 230 may be disposed on the bottom surface of the cover bottom 260 to enhance the utilization of the light guided by the light guide plate 280, but the present invention is not limited thereto.

The circuit board 270 includes light emitting portions 275 mounted on one surface thereof to provide light to the liquid crystal panel 210. [ The circuit board 270 is provided with wiring routed so that power supplied from the outside is supplied to the light emitting portions 275. The light emitting units 275 mounted on one surface of the circuit board 270 may be formed of light emitting diodes, but the present invention is not limited thereto.

The fixing portion 290 is inserted through the via holes HL formed in the bottom surface and the side surface of the cover bottom 260 and is formed on one surface of the circuit board 270 on which the light emitting portions 275 are mounted, So that the circuit board 270 can be attached and fixed to the inner surface of the cover bottom 260.

Hereinafter, the fixing unit 290 will be described in more detail with reference to the drawings.

6 is a view illustrating a fixing unit according to a second embodiment of the present invention.

5 and 6, the fixing portion 290 is disposed on the inner surface of the cover bottom 260 and is inserted through the via holes HL to press one surface of the circuit board 270, And second fixing portions 295 which are located on the outer surface of the cover bottom 260 and fixedly engaged with the first fixing portions 291. [

The fixing portion 290 includes fixing groove portions 293 formed on the upper end surfaces of the first fixing portions 291 and fixing portions 293 protruding from the surfaces of the second fixing portions 295 and fixed to the fixing groove portions 293 As shown in FIG. As described above, the shape of the first fixing portions 291 may be diagonally shaped, and the shape of the second fixing portions 295 may be rectangular, but is not limited thereto.

When fixing the circuit board 270 to the cover bottom 260, the first fixing portions 291 cover the surface of the circuit board 270 on which the light emitting portions 275 are mounted, (HL) formed in the via hole (HL). The second fixing portions 295 are attached to the outer surface of the cover bottom 260 and the protrusions 297 protruding from the surface of the second fixing portions 295 are attached to the first fixing portions 291 And is coupled to the formed fixing groove portions 293. Thus, the circuit board 270 can be attached and fixed to the inner surface of the cover bottom 260 by the engagement structure of the fixing portion 290. [

As the coupling structure of the fixing portion 290 is the same as this, it is possible to have a more convenient and rigid coupling structure than the structure in which the screw is fixed through the circuit board 270 or fixed through the auxiliary substrate for assembly as in the conventional case. Accordingly, the embodiment can solve the difficulty in routing the wiring for supplying power to the light emitting parts 275 in the design of the circuit board 270, and advantageously does not need to use the auxiliary board for assembly have. Also, the embodiment can reduce the ease of attachment / detachment between the protruding portions 292 and the engaging portions 296 included in the fixing portion 290. [

≪ Third Embodiment >

7 is a partial cross-sectional view of a liquid crystal display device according to a third embodiment of the present invention.

7, the liquid crystal display according to the third embodiment of the present invention includes a liquid crystal panel 310, optical sheets 340, a cover bottom 360, a circuit board 370, a light guide plate 380, And a fixing portion 390.

The liquid crystal panel 310 may have a structure in which a first substrate 310a on which a thin film transistor is formed and a second substrate 310b on which a color filter is formed are bonded together with a liquid crystal layer Cl therebetween. The alignment layer may be positioned on the first substrate 310a and the second substrate 310b according to the characteristics of the liquid crystal layer Cl. A polarizer 320 is attached to the upper and lower surfaces of the liquid crystal panel 310 to polarize the light incident on the liquid crystal panel 310 and the incident light.

The cover bottom 360 supports the liquid crystal panel 310 and has a structurally bent step to accommodate the optical sheets 340, the reflective portion 330, the circuit board 370, the light guide plate 380, . A guide panel top 365 may be attached to the cover bottom 360 to support the liquid crystal panel 310. The cover bottom 360 includes via holes HL formed on the base and side surfaces.

The optical sheets 340 may include a diffusion plate, a diffusion sheet, a prism sheet, and a protective sheet so as to efficiently supply the light emitted from the light emitting units 375 to the liquid crystal panel 310. However, It does not. The light guide plate 380 may be positioned adjacent to the light emitting units 375 mounted on the circuit board 370 to guide the light emitted from the light emitting units 375 to the liquid crystal panel 310. However, The reflector 330 may be disposed on the bottom surface of the cover bottom 360 to increase the utilization of light guided by the light guide plate 380, but is not limited thereto.

The circuit board 370 includes light emitting portions 375 mounted on one surface thereof to provide light to the liquid crystal panel 310. [ The circuit board 370 is provided with wiring routed so that power supplied from the outside is supplied to the light-emitting portions 375. The light emitting units 375 mounted on one surface of the circuit board 370 may be formed of light emitting diodes, but the present invention is not limited thereto.

The fixing portion 390 is inserted through the via holes HL formed in the bottom surface and the side surface of the cover bottom 360 and is formed on one surface of the circuit board 370 on which the light emitting portions 375 are mounted, So that the circuit board 370 can be attached and fixed to the inner surface of the cover bottom 360.

Hereinafter, the fixing unit 390 will be described in more detail with reference to the drawings.

8 is a view illustrating a fixing unit according to a third embodiment of the present invention.

7 and 8, the fixing portion 390 is disposed on the inner surface of the cover bottom 360 and has a first diagonal shape, which is inserted through the via holes HL to press one surface of the circuit board 370, And may include fixing portions 391 and second fixing portions 395 which are located on the outer surface of the cover bottom 360 and fixedly engaged with the first fixing portions 391. [

The fixing portion 390 includes fixing groove portions 394 formed on the upper end surface of the first fixing portions 391, fixing holes 398 formed in the second fixing portions 395, 398, and fixed to the fixing groove portions 394. The fixed screw portions 399 penetrate through the fixing hole portions 398 and are fitted into the fixing groove portions 394 so that the first fixing portions 391 and the second fixing portions 395 can be fitted and fixed Screw-type screws may be used, but screw-type screws may be used. As described above, the shape of the first fixing portions 391 may be diagonally shaped, and the shape of the second fixing portions 395 may be rectangular, but is not limited thereto.

When fixing the circuit board 370 to the cover bottom 360, the first fixing portions 391 cover the one surface of the circuit board 370 on which the light emitting portions 375 are mounted, (HL) formed in the via hole (360). And the second fixing portions 395 are attached to the outer surface of the cover bottom 360. And is fixed by fixing screw portions 399 which are inserted through the fixing hole portions 398 and fitted into the fixing groove portions 394. Thus, the circuit board 370 can be fixedly attached to the inner surface of the cover bottom 360 by the engagement structure of the fixing portion 390.

As the coupling structure of the fixing portion 390 is the same, it is possible to have a more secure and rigid coupling structure than the structure in which the screw is fixed through the circuit board 370 or fixed via the auxiliary substrate for assembly as in the conventional case. Accordingly, the embodiment can solve the difficulty in routing the wiring for supplying power to the light emitting units 375 in the design of the circuit board 370, and advantageously does not require the use of the auxiliary board for assembly have.

<Fourth Embodiment>

9 is a partial cross-sectional view of a liquid crystal display device according to a fourth embodiment of the present invention.

9, the liquid crystal display according to the fourth embodiment of the present invention includes a liquid crystal panel 410, optical sheets 440, a cover bottom 460, a circuit board 470, a light guide plate 480, And a fixing portion 490.

The liquid crystal panel 410 may have a structure in which a first substrate 410a on which a thin film transistor is formed and a second substrate 410b on which a color filter is formed are bonded together with a liquid crystal layer Cl therebetween. The alignment layer may be positioned on the first substrate 410a and the second substrate 410b according to the characteristics of the liquid crystal layer Cl. On the upper and lower surfaces of the liquid crystal panel 410, a polarizer 420 for polarizing the light incident on the liquid crystal panel 410 and the emitted light is attached.

The cover bottom 460 supports the liquid crystal panel 410 and has a structurally bent step to accommodate the optical sheets 440, the reflector 430, the circuit board 470, the light guide plate 480, . A guide panel top 465 may be attached to the cover bottom 460 to support the liquid crystal panel 410. The cover bottom 460 includes a base PS and a passage PS formed in the side face.

On the other hand, the optical sheets 440 transmit the light emitted from the light emitting portions 475 to the liquid crystal panel 410 Diffusing sheet, prism sheet, protective sheet, and the like so as to efficiently provide the light emitting diode. The light guide plate 480 may be positioned adjacent to the light emitting units 475 mounted on the circuit board 470 so as to guide the light emitted from the light emitting units 475 to the liquid crystal panel 410. However, The reflector 430 may be disposed on the bottom surface of the cover bottom 460 to increase the utilization of the light guided by the light guide plate 480, but is not limited thereto.

The circuit board 470 includes light emitting portions 475 mounted on one surface thereof to provide light to the liquid crystal panel 410. The circuit board 470 is provided with wiring routed so that power supplied from the outside is supplied to the light emitting portions 475. The light emitting units 475 mounted on one surface of the circuit board 470 may be formed of light emitting diodes, but the present invention is not limited thereto.

The fixing portion 490 is slidably inserted along the passage PS formed on the bottom surface and the side surface of the cover bottom 460 and includes a first fixing surface 491 and light emitting portions 475 which cover the outer surface of the cover bottom 460 And a second fixing surface 495 covering one surface of the mounted circuit board 470.

The pressing portion 499 is formed on the second fixing surface 490 and the circuit board 470 and the cover bottom 460 located between the first fixing surface 491 and the second fixing surface 495 included in the fixing portion 490, 495 so that the circuit board 470 is fitted to the hole HH formed in the first fixing surface 491 so as to be fixedly attached to the inner surface of the cover bottom 460. [

Hereinafter, the fixing portion 490 will be described in more detail with reference to the drawings.

Fig. 10 is a view showing a fixing part and a circuit board, and Fig. 11 is a perspective view showing a fixing part and a pressing part.

10 (a) is a plan view of a fixing portion 490 coupled to press the circuit board 470, and FIG. 10 (b) shows a fixing portion 490 As shown in FIG. Referring to FIG. 10 (b), the pressing portion 499 may be a screw. When the screw-shaped pressing portion 499 is rotated, the cover bottom 460 as well as the circuit board 470 located in the fixing portion 490 can be pushed toward the first fixing surface 491 Able to know. 10 and 11, the first fixing surface 495 included in the fixing portion 490 includes an upper fixing surface 495a covering an upper surface of the circuit board 470, 470, but the shape of the lower fixing surface 495b is not limited thereto.

Since the coupling structure of the fixing portion 490 and the pressing portion 499 is the same as this, it is possible to secure and secure the coupling structure more secure than the structure in which the screws are fixed through the circuit board 470 or fixed through the auxiliary substrate for assembly . Accordingly, the embodiment can solve the difficulty in routing the wiring for supplying the power to the light emitting units 475 in the design of the circuit board 470, and advantageously does not need to use the auxiliary board for assembly have. In addition, the embodiment may provide ease when detaching the circuit board 470 from the cover bottom 460 by using the fixing portion 490 and the pressing portion 499.

Embodiments of the present invention can be applied to a backlight unit using a fixing unit having a convenient and rigid connection structure when assembling a backlight unit, It is possible to solve the difficulty of the liquid crystal display device.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that the invention may be practiced. It is to be understood, therefore, that the embodiments described above are to be considered in all respects only as illustrative and not restrictive. In addition, the scope of the present invention is indicated by the following claims rather than the detailed description. Also, all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

1 is a partial cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention;

2 is a cross-sectional exemplary view of a liquid crystal panel;

3 is a view showing a fixing part and a circuit board.

4 is a view illustrating a fixing unit according to a first embodiment of the present invention.

5 is a partial cross-sectional view of a liquid crystal display device according to a second embodiment of the present invention.

6 is a view illustrating a fixing unit according to a second embodiment of the present invention.

7 is a partial cross-sectional view of a liquid crystal display device according to a third embodiment of the present invention.

8 is a view illustrating a fixing unit according to a third embodiment of the present invention.

9 is a partial cross-sectional view of a liquid crystal display device according to a fourth embodiment of the present invention.

10 is a view showing a fixing part and a circuit board.

11 is a perspective view of a fixing part and a pressing part.

DESCRIPTION OF THE REFERENCE NUMERALS

110, 210, 310, 410: liquid crystal panel 140, 240, 340, 440:

170, 270, 370, 470: circuit board 180, 280, 380, 480:

190, 290, 390, 490:

Claims (10)

A liquid crystal panel; A cover bottom supporting the liquid crystal panel; A circuit board on which light emitting units for providing light to the liquid crystal panel are mounted; A light guide plate for guiding the light emitted from the light emitting portion to the liquid crystal panel; And The circuit board being inserted through the via holes formed in the bottom surface and the side surface of the cover bottom and pressing the one side of the circuit board on which the light emitting units are mounted and the outer side of the cover bottom to fix the circuit board on the inner side surface of the cover bottom Including governments, The fixing portion includes first and second fixing portions located on the inner surface of the cover bottom and inserted through the via holes to press one surface of the circuit board, And second fixing portions located on an outer surface of the cover bottom and engaged with the first fixing portions. delete The method according to claim 1, The fixing unit includes: Projections protruding from the surface and located at the ends of the first fixing portions, And engaging portions formed in the grooves of the second fixing portions. The method according to claim 1, The fixing unit includes: Fixing grooves formed on the upper end surfaces of the first fixing portions, And protrusions protruding from the surfaces of the second fixing parts and being fitted in the fixing groove parts. The method according to claim 1, The fixing unit includes: Fixing grooves formed on the upper end surfaces of the first fixing portions, Fixing holes formed in the second fixing portions, And fixing screw portions passing through the fixing holes to be fitted into the fixing groove portions. 6. The method of claim 5, The fastening screw portions, And the first fixing portions and the second fixing portions are screwed to each other to fix the first fixing portions and the second fixing portions. The method according to claim 1, The shape of the second fixing portions may be, Wherein the liquid crystal display device has a square shape. A liquid crystal panel; A cover bottom supporting the liquid crystal panel; A circuit board on which light emitting units for providing light to the liquid crystal panel are mounted; A light guide plate for guiding the light emitted from the light emitting portion to the liquid crystal panel; And a second fixing surface that is slidably inserted along a passage formed on a bottom surface and side surfaces of the cover bottom and covers a first fixing surface for covering the outer surface of the cover bottom and one surface of the circuit board on which the light emitting portions are mounted, ; And The circuit board and the cover bottom located between the first fixing surface and the second fixing surface are pushed toward the second fixing surface to fix the circuit board to the inner surface of the cover bottom, And a pressing portion that is fitted in the hole formed in the surface. 9. The method of claim 8, The pressing unit includes: And a screw. 9. The method of claim 8, Wherein the first fixing surface comprises: An upper fixing surface covering an upper surface of the circuit board, And a lower fixing surface for covering a lower surface of one side of the circuit board.

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