KR20160094163A - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device comprising a liquid crystal panel, a guide panel for seating the liquid crystal panel, a lower cover disposed at a lower portion of the guide panel and containing a light source portion for providing light to the liquid crystal panel, And a top case having a top case fixing part which is coupled to a lower surface of the lower cover to cover the guide panel and the bottom cover.

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a top case fixing structure of a bending shape.

A typical liquid crystal display device utilizes the optical anisotropy and polarizability of a liquid crystal. The liquid crystal has an anisotropic property having a long and narrow molecular structure and a directional arrangement. When the liquid crystal is placed in an electric field, Lt; / RTI >

Accordingly, the liquid crystal display device has a liquid crystal panel composed of a pair of transparent insulating substrates each having a field-generating electrode formed on a surface facing each other with a liquid crystal layer sandwiched therebetween as an essential component, The arrangement direction of the molecules is artificially adjusted, and various images are displayed by using the transmittance of light which is changed at this time.

Since the liquid crystal panel is an element which does not have its own light emitting element, it requires a separate light source. Accordingly, a backlight unit having a light source is provided on the back surface to illuminate the front surface of the liquid crystal panel, thereby realizing an image of brightness that can be recognized only through the backlight unit.

A conventional liquid crystal display will now be described with reference to FIGS. 1 and 2. FIG.

1 is an exploded perspective view of a conventional liquid crystal display device.

Fig. 2 is an enlarged cross-sectional view of the liquid crystal display device according to the prior art, schematically showing a fastening structure between a top case, a bottom cover and a light source housing by screws, in Fig.

1, a conventional liquid crystal display includes a liquid crystal panel 10, a backlight unit (not shown) including a guide panel 70 and a lower cover 80, and a top case 90 .

As shown in the figure, the liquid crystal panel 10 includes a color filter substrate 12, a thin film transistor substrate 14, and a liquid crystal layer (not shown) interposed between the substrates 12 and 14. [

A liquid crystal panel 10 is disposed on an upper surface of a rectangular guide panel 90 and a light source 20, a light guide plate 30, an optical sheet 40, and a reflection sheet 50 are disposed under the guide panel 90 A top case 90 covering the edge of the liquid crystal panel 10 is disposed on the outer side of the lower cover 80 and the guide panel 90 so as to be assembled Respectively.

 The light source unit 20 includes an LED element 22 and a substrate 24 on which the LED element 22 is mounted. The light source unit 20 including the LED device 22 and the substrate 24 is disposed and assembled in the light source housing 60.

The optical sheet 40 disposed on the light guide plate 30 includes a diffusion sheet 42 and a plurality of prism sheets 44.

2, the lower cover 80 is open at its upper portion and includes a light source housing 60, a light source 20, a reflective sheet 50, a light guide plate 30, and an optical sheet 40 ).

The side surface 82 of the lower cover 80 is provided with a burring portion 84 having a screw insertion portion 86 so that the screw portion 92a of the screw 92 can be fastened inwardly have. At this time, since the side 82 of the lower cover 80 requires the burring portion 84 for fastening the screw 92, a side wall length of at least 7 mm, for example, 7 mm or more is required.

In addition, a screw fastening part 62 is provided on the side surface of the light source housing 60 so that the threaded part 92a of the screw 92 can be fastened. At this time, the light source housing 60 also requires a housing portion having a minimum thickness t to form a screw fastening portion 62 to which the screw portion 92a of the screw 92 is fastened.

On the other hand, the edge portion of the liquid crystal panel 10 is seated and supported on the panel seating portion 72 of the guide panel 70.

The top cover 90 covering the edge of the liquid crystal panel 10 is tightly coupled to the outer surface of the guide panel 70 and the bottom cover 80 and the bottom cover 80 And the screw fastening portion 62 of the light source housing 60. As shown in FIG. The top case 90 serves to firmly support the upper portion of the liquid crystal display device, and an image formed on the liquid crystal panel 10 is displayed by opening the front surface.

As described above, the liquid crystal display according to the related art has a drawback in that when a fastening structure using a screw is applied due to a thickness restriction at the time of designing a slim liquid crystal display (LCM), a counterpart, and it is difficult to form a screw fastening portion in the light source housing. In particular, a sidewall having a height h of at least 7 mm is required when burring is formed on the side surface of the lower cover, and a screw fastening portion having a minimum of 5.0 mm or more is required for the light source housing.

Accordingly, in the liquid crystal display according to the related art, the side surface of the gold lower cover is required to be 7 mm or more in order to form a burring for fastening the screw. When the size is smaller than that, A difficulty arises.

And. The liquid crystal display device according to the related art requires a portion of the light source housing to have a certain thickness t or more for forming a screw fastening portion to fasten the screw. When the screw tightening portion is smaller than the predetermined thickness t, do.

It is an object of the present invention to provide a lower cover which can secure a degree of freedom in designing a lower cover because there is no restriction on the minimum thickness of a side surface of a lower cover required for tightening a screw, And a liquid crystal display device.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal panel; a guide panel for seating the liquid crystal panel; a light source unit disposed below the guide panel for providing light to the liquid crystal panel; And a top case having a top cover case and a top case fixing member, which covers the guide panel and the bottom cover and is coupled to a bottom surface of the bottom cover, can be provided.

In this liquid crystal display device, the top case fixing part is folded inwardly of the top case and fastened to the bottom surface of the bottom cover to fix the top case.

In such a liquid crystal display device, the top case fixing portion may be integrally formed with the top case.

In this liquid crystal display device, at least one or more of the top case fixing portions may be provided on the lower portions of at least both side portions of at least two mutually facing side portions of the top case.

In such a liquid crystal display device, the top case fixing portion may be provided below each side portion of the top case.

The liquid crystal display device according to the present invention has no restriction on the minimum thickness of the side surface portion of the lower cover necessary for fastening the screw, so that the degree of freedom in designing the lower cover can be secured.

In addition, since the present invention can be assembled by attaching the top case fixing portion provided at the bottom of the top case to the bottom surface of the bottom cover without omitting the conventional screw fastening method, the top case can be assembled It is possible to apply to the part where the screw fastening structure of the mold is difficult to be applied, and the removal of the screw can reduce the manufacturing cost as well as the assembly time.

1 is an exploded perspective view of a conventional liquid crystal display device.
Fig. 2 is an enlarged cross-sectional view of the liquid crystal display device according to the prior art, schematically showing a fastening structure between a top case, a bottom cover and a light source housing by screws, in Fig.
3 is an exploded perspective view of a liquid crystal display device according to the present invention.
4 is an assembled cross-sectional view of a liquid crystal display device according to the present invention.
5 is a perspective view of a top case of a liquid crystal display device according to the present invention.
6A to 6C are assembly process diagrams of a liquid crystal display device according to the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In describing the components of the invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected to or connected to the other component, It should be understood that an element may be "connected," "coupled," or "connected." In the same context, when an element is described as being formed on an "upper" or "lower" side of another element, the element may be formed either directly or indirectly through another element As will be understood by those skilled in the art.

3 is an exploded perspective view of a liquid crystal display device according to the present invention.

4 is an assembled cross-sectional view of a liquid crystal display device according to the present invention.

5 is a perspective view of a top case of a liquid crystal display device according to the present invention.

3 and 4, a liquid crystal display according to the present invention includes a liquid crystal panel 100, a backlight unit 200 for providing light to the liquid crystal panel 100, and a liquid crystal panel 100 and a backlight unit And a top case 500 surrounding the top case 500.

The liquid crystal panel 100 includes a color filter (CF) substrate 110 and a thin film transistor (TFT) substrate 120 disposed under the color filter substrate 110, An integrated circuit chip (IC) (not shown) and a flexible printed circuit (FPC) (not shown) are mounted on one side of the panel 100.

The color filter substrate 110 includes a common electrode (not shown) formed on the color filter and made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) Not shown) may be formed. At this time, a common electrode (not shown) may be formed on the thin film transistor substrate 120 according to a liquid crystal driving method.

In the thin film transistor substrate 120, a TFT in the form of a matrix is formed, and source and gate terminals of the TFTs are connected to a data line and a gate line, respectively, and a drain terminal is connected to a pixel electrode.

The integrated circuit chip (IC) is mounted on one side of the thin film transistor substrate 114, and has a data signal as a signal for driving the liquid crystal panel 100, a gate driving signal, and a plurality of timings And applies a gate driving signal and a data driving signal to the gate line and the data line of the liquid crystal panel 100, respectively.

One end of the FPC is connected to one side of the thin film transistor substrate 120 to convert an analog signal of an external type inputted into the flexible circuit board into a digital signal and supply it to the integrated circuit chip (IC) .

Meanwhile, the backlight unit 200 is disposed below the liquid crystal panel 100 and serves to provide light to the liquid crystal panel 100.

The backlight unit 200 includes a light source unit 210, a light guide plate 220 disposed on one side of the light source unit 210, an optical sheet 230 disposed on the light guide plate 220, A lower cover 300 in which the components are housed, and a guide panel 400 surrounding the components.

The light source unit 210 generates light and includes an LED device 212 and a substrate 214 on which the LED device 212 is mounted. The LED element 212 may be an R, G, or B light emitting diode that emits red light, G (green), or B (blue) monochromatic light, or a light emitting diode that emits white light. Side view type device can be used.

When the LED element 212 that emits monochromatic light is used, the monochromatic LED elements 212 of R, G, and B are alternately arranged at regular intervals, monochromatic light emitted therefrom is mixed with white light, To the panel (100). Alternatively, when the LED element 212 that emits white light is used, the plurality of LED elements 212 may be disposed at a predetermined interval to supply white light to the liquid crystal panel 100. [

For example, the white light LED element 212 is composed of a blue LED element 212 that emits blue light and a phosphor that emits yellow light by absorbing blue monochromatic light, Monochromatic light and yellow monochromatic light emitted from the phosphor may be mixed and supplied to the liquid crystal panel 100 as white light.

The substrate 214 is a flexible circuit board having excellent warpage, and a circuit (not shown) may be formed therein. Thus, external power can be supplied to the LED element 212 through the circuit.

Although the light source unit 210 is disposed on one side of the light guide plate 220 as a side backlight unit in the drawing, the light source unit 210 may be disposed on the other side of the light guide plate 220, It can also be applied to units.

Although LEDs are used as light sources, the present invention is not limited thereto, and various light sources for generating light such as cold cathode fluorescent lamps can be used.

A light guide plate (LGP) 220 guides the light emitted from the light source unit 210 to the liquid crystal panel 100. The light incident on one side of the light guide plate 220 is refracted and reflected repeatedly by the diffuser added to the inside of the light guide plate 220 to advance to the other side and then emitted to the upper portion of the light guide plate 220. That is, the light guide plate 220 serves to change light having an optical distribution in the form of a point light source or a linear light source into light having an optical distribution in the form of a surface light source.

The optical sheet 230 is disposed on the upper side of the light guide plate 220 to improve the efficiency of light emitted from the light guide plate 220 and supply the light to the liquid crystal panel 100. The optical sheet 230 includes a diffusion sheet 232 for diffusing the light emitted from the light guide plate 220 and a light diffusion sheet 232 for condensing the light diffused by the diffusion sheet 232, And a plurality of prism sheets 234 for supplying a plurality of prism sheets 234.

The diffusion sheet 232 is usually provided with one sheet, but the prism sheet 234 may have a first prism sheet and a second prism sheet that are perpendicular to each other in the horizontal (X), vertical (Y) have. The first prism sheet and the second prism sheet can improve the straightness of light by refracting light in the X and Y axis directions.

The number of the diffusion sheet 232 and the prism sheet 234 is not limited to this, and some optical sheets 230 may be added or removed so as to have four or more, or two or less, as necessary.

A pattern (not shown) may be formed on one surface of the prism sheet 234 so as to more evenly distribute the brightness of the light. The shape of the pattern may be various shapes such as an acid, a hemisphere, and a polygon.

The reflective sheet 240 is disposed under the light guide plate 220 and reflects light emitted from the light guide plate 220 to the lower side in the direction of the liquid crystal panel 100. The reflection sheet 220 can adjust the reflection amount of the entire incident light so that the entire light output surface has a uniform luminance distribution.

A lower cover 300 in which the reflective sheet 220, the light source unit 210, and the light guide plate 220 are accommodated is disposed below the reflective sheet 220.

On the other hand, on the outer side of the lower cover 300, a rectangular frame side portion 302 is provided to accommodate the components.

A panel seating part 402 is provided on the upper surface of the guide panel 400 so that the liquid crystal panel 100 is seated and supported on the panel seating part 402.

5 is a perspective view of a top case of a liquid crystal display device according to the present invention.

5, the top case 500 is disposed so as to cover upper and lower sides of the guide panel 400 and the side cover 302 of the lower cover 300, And a top case fixing part 510 which is fixed to the lower surface of the lower cover 300 in close contact with the bottom part.

The top case fixing part 510 is provided on the bottom surface of each side of the top case 500 to have a small thickness. The top case fixing part 510 may include at least one of the side parts of at least two opposite side surfaces of the top case 500.

The top case fixing part 510 may be integrally formed with the top case 500.

The top case fixing part 510 is configured to be tightly fixed to the lower surface of the lower cover 300 in a folded state.

The cover case 504 is disposed on the edge of the liquid crystal panel 100 in a state in which the top case 500 is disposed so as to surround the side panels 302 of the guide panel 400 and the bottom cover 300 And the top case fixing part 510 is folded on the lower surface of the lower cover 300 and fixed in close contact therewith, thereby easily assembling the liquid crystal display device. At this time, since the top case fixing part 510 is folded and fixed in close contact with the lower surface of the lower cover 300, the top case 500 is closely contacted with the lower cover 300 and the guide panel 400 .

6A to 6C, a process of assembling the liquid crystal display device according to the present invention will be described.

6A to 6C are cross-sectional views illustrating an assembly process of a liquid crystal display device according to the present invention.

The light source housing 250 is disposed on one side of the lower cover 300 having the side portion 302 having a predetermined height and the light source portion 210 is disposed on the light source housing 250 do.

The light source unit 210 generates light and includes an LED device 212 and a substrate 214 on which the LED device 212 is mounted. The LED element 212 may be an R, G, B light emitting diode that emits monochromatic light of R (Red), G (Green), or B (Blue), or a light emitting diode that emits white light, ) Type device may be used.

Although the light source unit 210 is disposed on one side of the light guide plate 220 as a side backlight unit in the drawing, the light source unit 210 may be disposed on the other side of the light guide plate 220, The present invention can also be applied to a backlight unit of FIG.

Although an LED element is used as a light source here, it is not limited thereto, and various light sources for generating light such as a cold cathode fluorescent lamp can be used.

A light guide plate 220 is disposed adjacent to the light source unit 210 and a reflective sheet 240 is disposed under the light guide plate 220. Here, the light guide plate (LGP) 220 guides the light emitted from the light source unit 210 to the liquid crystal panel 100. The light incident on one side of the light guide plate 220 is refracted and reflected repeatedly by the diffuser added to the inside of the light guide plate 220 to advance to the other side and then emitted to the upper portion of the light guide plate 220. That is, the light guide plate 220 serves to change light having an optical distribution in the form of a point light source or a linear light source into light having an optical distribution in the form of a surface light source.

The reflective sheet 240 reflects the light emitted from the light guide plate 220 to the lower side in the direction of the liquid crystal panel 100. The reflective sheet 240 can adjust the amount of reflection of the entire incident light so that the entire light emitting surface has a uniform luminance distribution.

Then, the optical sheet 230 is disposed on the light guide plate 220. At this time, the optical sheet 230 is disposed on the upper side of the light guide plate 220 to improve efficiency of light emitted from the light guide plate 220 and supply the light to the liquid crystal panel 100. The optical sheet 230 includes a diffusion sheet 232 for diffusing the light emitted from the light guide plate 220 and a light diffusion sheet 232 for condensing the light diffused by the diffusion sheet 232, And a plurality of prism sheets 234 for supplying a plurality of prism sheets 234.

The diffusion sheet 232 is usually provided with one sheet, but the prism sheet 234 may have a first prism sheet and a second prism sheet that are perpendicular to each other in the horizontal (X), vertical (Y) have. The first prism sheet and the second prism sheet can improve the straightness of light by refracting light in the X and Y axis directions.

The number of the diffusion sheet 232 and the prism sheet 234 is not limited to this, and some optical sheets 230 may be added or removed so as to have four or more, or two or less, as necessary.

A pattern (not shown) may be formed on one surface of the prism sheet 234 so as to more evenly distribute the brightness of the light. The shape of the pattern may be various shapes such as an acid, a hemisphere, and a polygon.

Then, a rectangular panel-shaped guide panel 400 is disposed on the upper side of the lower cover 240. At this time, a panel seating part 402 is provided on the upper surface of the guide panel 400, and the liquid crystal panel 100 is supported on the panel seating part 402.

Then, the liquid crystal panel 100 is placed on the panel seating portion 402 of the guide panel 400.

The liquid crystal panel 100 includes a color filter (CF) substrate 110 and a thin film transistor (TFT) substrate 120 disposed under the color filter substrate 110, An integrated circuit chip (IC) (not shown) and a flexible printed circuit (FPC) (not shown) are mounted on one side of the liquid crystal panel 100.

The color filter substrate 110 includes a common electrode (not shown) formed on the color filter and made of a transparent conductor such as indium tin oxide (ITO) or indium zinc oxide (IZO) Not shown) may be formed. At this time, a common electrode (not shown) may be formed on the thin film transistor substrate 120 according to a liquid crystal driving method.

In the thin film transistor substrate 120, a TFT in the form of a matrix is formed, and source and gate terminals of the TFTs are connected to a data line and a gate line, respectively, and a drain terminal is connected to a pixel electrode.

The integrated circuit chip (IC) is mounted on one side of the thin film transistor substrate 114, and has a data signal as a signal for driving the liquid crystal panel 100, a gate driving signal, and a plurality of timings And applies a gate driving signal and a data driving signal to the gate line and the data line of the liquid crystal panel 100, respectively.

One end of the FPC is connected to one side of the thin film transistor substrate 120 to convert an analog signal of an external type inputted into the flexible circuit board into a digital signal and supply it to the integrated circuit chip (IC) .

6B, the top case 500 is disposed to cover the outer side surface of the guide panel 400 and the side surface 302 of the lower cover 300. As shown in FIG. The top case 500 includes a lid 504 covering the rim of the liquid crystal panel 100 and a top case fixing part 510 fixedly attached to the lower surface of the bottom cover 300.

The top case fixing part 510 may be formed to have a thin thickness on each side surface of the top case 500 and may be formed on at least one side or along the longitudinal direction on the bottom side of each side part.

The top case fixing part 510 provided at the lower part of the top case 500 is tightly fixed to the bottom surface of the bottom cover 300 in a folded state to fix the liquid crystal display device according to the present invention . Since the top case fixing part 510 is folded and fixed to the bottom surface of the bottom cover 300 to be fixed thereto, the lid 504 and the side parts of the top case 500 are fixed to the bottom cover 300 and the guide And is assembled tightly from the panel 400 without lifting.

As described above, since the liquid crystal display device according to the present invention has no restriction on the minimum thickness of the side surface portion of the lower cover necessary for fastening the screw, it is possible to secure a degree of freedom in the design of the lower cover.

In addition, since the present invention can be assembled by attaching the top case fixing portion provided at the bottom of the top case to the bottom surface of the bottom cover without omitting the conventional screw fastening method, the top case can be assembled It is possible to apply to the part where the screw fastening structure of the mold is difficult to be applied, and the removal of the screw can reduce the manufacturing cost as well as the assembly time.

Although the embodiments have been described with reference to the drawings, the present invention is not limited thereto.

It is to be understood that the terms "comprises", "comprising", or "having" as used in the foregoing description mean that the constituent element can be implanted unless specifically stated to the contrary, But should be construed as further including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

300: lower cover 302: side surface
500: Top case 504: Cover part
510: Top case fixing part

Claims (5)

A liquid crystal panel;
A guide panel for seating the liquid crystal panel;
A lower cover disposed at a lower portion of the guide panel and containing a light source for providing light to the liquid crystal panel, a light guide plate, an optical sheet, and a reflective sheet; And
And a top case having a top case fixing part which is coupled to a bottom surface of the bottom cover to cover the guide panel and the bottom cover. The liquid crystal display of claim 1, wherein the top case fixing part is folded inward of the top case and is closely attached to the bottom surface of the bottom cover. The liquid crystal display of claim 1, wherein the top case fixing part is integrally formed with the top case. The liquid crystal display of claim 1, wherein at least one of the top case fixing portions is provided on each of at least two opposite side portions of at least one of the side portions of the top case. The liquid crystal display of claim 1, wherein the top case fixing portion is provided below each side portion of the top case.

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