KR20070071299A - Liquid crystal display device - Google Patents

Abstract

An LCD(Liquid Crystal Display) is provided to make it possible to fix a reflector to a bottom cover without a double-sided tape, by using a lamp guide and an elastic force of the reflector which is bent in a predetermined shape. A bottom cover(301) has a first horizontal plane(301a) and a vertical plane(301b), wherein the first horizontal plane and the vertical plane make a right angle. A reflector(303) has a horizontal plane(303a), an inclination plane(303b), and a vertical plane(303c), wherein the horizontal plane and the inclination plane make an obtuse angle, and the inclination plane and the vertical plane make an acute angle. At least one lamp(305) is formed on the horizontal plane of the reflector. At least one lamp guide(307) fixes the lamp, and joins the first horizontal plane of the bottom cover and the horizontal plane of the reflector to each other. An optical sheet(309) is formed above the lamp. A support main(311) wraps the optical sheet.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

1 is a perspective view of a general direct type backlight unit

2 is a perspective view of a typical side type backlight unit

3 is an exploded view of a liquid crystal display device having a general direct type backlight unit;

4 is a cross-sectional view of an LCD according to the related art.

5 is a cross-sectional view of an LCD according to the related art.

6 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention.

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

8 to 8C are cross-sectional views showing forms before and after elastic deformation of the reflector of the present invention.

** Explanation of symbols for main parts of drawings **

301: Bottom Cover

301a, 301b, and 301c: first horizontal plane, vertical plane and second horizontal plane of the bottom cover

303: Reflector

303a, 303b, 303c: horizontal, inclined and vertical planes of the reflector

307: lamp guide

The present invention relates to a liquid crystal display device, and more particularly, to the structure of the reflector and the bottom cover constituting the liquid crystal display device.

Recently, the importance of the display device as a visual information transmission medium has been further emphasized, and many kinds of competitive display devices have been developed. Among such various types of display devices, in order to occupy a major position in the future, it is necessary to satisfy requirements such as low power consumption, thinness, light weight, and high quality.

 Liquid Crystal Display (LCD), the flagship product of flat panel displays (FPDs), is not only capable of meeting these conditions but also mass-produced. It is widely used in various applications and is positioned as a core display device that can replace the market dominated by a conventional cathode ray tube (CRT).

The liquid crystal display device includes a liquid crystal panel composed of a top plate called a thin film transistor array substrate, a bottom plate called a color filter substrate, and a liquid crystal filled therebetween.

In this case, N × M pixels are arranged vertically and horizontally on the upper plate, and each unit pixel is formed with a thin film transistor for transmitting an image signal and a pixel electrode for forming an electric field. A color filter pattern and a black mattress are formed on the lower plate, and in the case of the vertical electric field method, a common electrode corresponding to the pixel electrode is formed.

The liquid crystal filled between the upper plate and the lower plate is a material having optical anisotropy, and varies in arrangement depending on an electric field formed between the pixel electrode and the common electrode, thereby causing a change in transmittance according to polarization characteristics of light.

However, since the liquid crystal display is a display device having non-light emitting characteristics, a separate external light source for irradiating light is required in addition to the liquid crystal panel. In particular, in the case of a transmissive liquid crystal display, a separate dimming device that emits light on the back of the LCD panel and induces light toward the liquid crystal panel is required.

As illustrated in FIG. 1, the backlight unit includes a plurality of lamps 101 arranged side by side on the rear side of the liquid crystal panel so that light can be directly projected from the rear side of the liquid crystal panel toward the liquid crystal panel. Direct type of the combined type and a lamp 106 combined with the lamp reflector 105 on one side or both sides of the liquid crystal panel as shown in FIG. 2 and the light generated from the lamp There is a side type that projects toward the liquid crystal panel. In order to cope with the recent trend toward larger and larger screens, a direct type backlight unit capable of high brightness including a plurality of light sources is widely used.

A configuration of a liquid crystal display device including the direct type backlight unit will be described with reference to FIG. 3.

FIG. 3 is an exploded perspective view of a liquid crystal display device including a general direct type backlight unit, and includes a liquid crystal panel 70 and a direct type backlight unit 5 and a plurality of combinations thereof. Contains components.

First, the direct type backlight unit 5 includes a bottom cover 10 that serves as a lower case constituting the exterior of the liquid crystal display device; A reflector (20) coupled to the bottom cover (10); A plurality of lamps 30 arranged in parallel on the reflector 20; An optical sheet 50 composed of a diffusion sheet 50c, a prism sheet 50b, and a protective sheet 50a sequentially stacked on the lamp 30; And a support main 60 surrounding the edges of the components.

As the plurality of first bolts 92 pass through the pair of side supports 40, respectively, the plurality of lamps 30 are fixed, and the plurality of second bolts 94 are fixed. As it is fastened to the bottom cover 10 through the support main 60, an integrated direct type backlight unit 5 is configured.

In addition, a liquid crystal panel 70 manufactured in a separate process is mounted on the direct type backlight unit 5, and a top cover 80 that covers an edge of the liquid crystal panel 70 is provided. The liquid crystal display device is completed through a plurality of third bolts 96 penetrating through the top case 80 and fastened to the bottom cover 10.

Next, the cross-sectional structure of the direct type backlight unit will be described in more detail with reference to FIG. 4.

FIG. 4 is a cross-sectional view taken along line AA ′ of FIG. 3, although shown in the drawing as limited to the top case 217, a direct type coupled with a plurality of first to third bolts 219, 221, and 223. (direct type) A cross sectional view of a liquid crystal display device having a backlight unit.

As shown in FIG. 4, the direct type backlight unit sequentially includes a bottom cover 201, a reflector 203, a plurality of lamps 205, an optical sheet 209, a support main 211, and a bottom cover 201. It consists of a liquid crystal panel 215 and a top case 217. In addition, a plurality of second bolts 221 penetrating the support main 211 to the bottom cover 201 and a plurality of third bolts penetrating the top case 217 to the bottom cover 201 ( 223 secures some of the components.

In addition, in order to fix the bottom cover 201 and the reflector 203, the first horizontal surface 201a of the bottom cover 201, the horizontal surface 203a of the reflector, and the inclined surface 201b of the bottom cover and the reflector The double-sided tape 225 is used between the inclined surfaces 203b, and the number thereof may vary depending on the size of the liquid crystal panel.

Although not shown in the drawings, the first bolt 219 penetrates through the pair of side supports 207 of FIG. 3 and the side supports 207 of FIG. 3 across both ends of the plurality of lamps 205. The fixing of the plurality of lamps 205 by the above has been described above.

In the above description, the liquid crystal display device in which the angles of inclination of the first horizontal plane 201a and the inclined surface 201b of the bottom cover 201 are obtuse angles has been described, but recently, the necessity of the bottom cover in which the angles of inclination are perpendicular to each other is described. This is emerging a lot. The reason for this is that when the angle of inclination is at right angles, dimensional management is easy in manufacturing the mold necessary for manufacturing the bottom cover, and the rigidity against torsion is superior to the bottom cover made of an obtuse angle.

Thus, the structure of the liquid crystal display when the first horizontal plane of the bottom cover and the inclination angle of the inclined surface form an obtuse angle has been described so far. Hereinafter, the liquid crystal display when the inclination angle forms a right angle with reference to FIG. 5. The structure of the apparatus will be described.

FIG. 5 is a cross-sectional view of a direct type backlight unit in a case where a bending angle between the first horizontal plane and the vertical plane of the bottom cover is at right angles.

As shown in FIG. 5, even when the angle of inclination is perpendicular, the first horizontal plane 203a of the reflector 203 and the inclined plane 203b should form an obtuse angle. This is to transmit the light generated from the lamp to the liquid crystal panel more efficiently. Therefore, in this structure, the angle of inclination between the inclined surface 203b and the second horizontal surface 203c of the reflector 203 is formed at an obtuse angle to fix the reflector 203 to the bottom cover 201.

At this time, the double-sided tape (between the first horizontal plane 201a of the bottom cover and the first horizontal plane 203a of the reflector, and the second horizontal plane 201c of the bottom cover and the second horizontal plane 203c of the reflector 225) is used, the number of which can also vary depending on the size of the liquid crystal panel.

As described above, since the double-sided tape 225 is used to fix the bottom cover 201 and the reflector 203 according to the prior art, a process called attaching the double-sided tape 225 is essential during the fixing operation. When the fixing position is incorrect after the double-sided tape 225 is attached, reworking is required, and a lot of work is required in the process of detaching the double-sided tape 225.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and in the case where the angle of inclination of the first horizontal plane and the vertical plane of the bottom cover is perpendicular to each other, an object of the present invention is to fix the reflector to the bottom cover without using a double-sided tape.

Specifically, in the present invention, the angle of inclination of the horizontal plane and the inclined plane of the reflector is constituted by an obtuse angle, and the angle of inclination of the inclined plane and the vertical plane is constituted by an acute angle, and then the first horizontal plane of the bottom cover and the horizontal plane of the reflector using a lamp guide. The purpose of this is to fix the reflector to the bottom cover without using a double-sided tape.

The liquid crystal display device of the present invention for achieving the above object, A bottom cover having a perpendicular angle between the first horizontal plane and the vertical plane; A reflector having a horizontal plane and an inclined plane at an obtuse angle, and the inclined plane and a vertical plane having an acute angle; At least one lamp formed on a horizontal plane of the reflector; At least one lamp guide fixing the lamp and simultaneously coupling the first horizontal plane of the bottom cover and the first horizontal plane of the reflector; An optical sheet formed on the lamp; And a support main surrounding the optical sheet.

A first embodiment of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the first embodiment of the present invention, in which a portion corresponding to the line AA ′ of FIG. 3 is an exploded view of a conventional structure.

First, the components will be described. The bottom cover 301, the reflector 303, the plurality of lamp guides 307, the plurality of lamps 305, the optical sheet 309, the support main 311, and the liquid crystal panel are sequentially formed from the bottom. 313 and top case 315. A plurality of second bolts 317 fastened to the bottom cover 301 through the support main 311 and a plurality of third bolts fastened to the bottom cover 301 through the top case 315. 319 secures some of the components. In this case, the optical sheet 309 may be composed of a diffusion sheet 309c, a prism sheet 309b and a protective sheet 309a.

Next, the characteristic parts of the present invention among the above components will be described in detail.

First, as shown in FIG. 6, the bottom cover 301 includes a first horizontal plane 301a and a second horizontal plane 301c perpendicular to the vertical plane 301b. As mentioned in the prior art, it is a structure having easy characteristics in mold manufacturing and high torsional strength.

Next, as shown in FIG. 6, the reflector 303 has an obtuse angle between the horizontal plane 303a and the inclined plane 303b, and the oblique angle between the inclined plane 303b and the vertical plane 303c is an acute angle. . As described above, the light emitted from the lamp 305 more efficiently the liquid crystal panel 313 At the same time, the bottom cover 301 and the reflector 303 are fixed without using the double-sided tape used in the prior art.

The reflector 303 is made of a material having elasticity, and for this purpose, the reflector 303 may be made of polyethylene terephthalate (PET). When the reflector 303 is made of polyethylene terephthalate (PET), the thickness thereof is preferably 0.7 mm to 1.0 mm. Because PET (Polyethylene Terephthalate) is a polymer material, in order to have elasticity, it must have a certain thickness. When the thickness is 0.7mm to 1.0mm, it has the most suitable elasticity for fixing with the bottom cover 301. In addition, the reflector 303 may be made of a metal material. Even in this case, the metal material has a certain elasticity.

Next, the lamp guide 307 serves to fix the lamp 305 as shown in FIG. 6 and to fix the first horizontal plane 301 a of the bottom cover and the horizontal plane 303 a of the reflector. Do it. Looking at the structure, a hole (not shown) is formed at the same position of the first horizontal surface 301a of the bottom cover and the horizontal surface 303a of the reflector, and the lamp guide 307 passes through the hole (not displayed) to hook (307b). ) Is fastened in a manner using. The first horizontal surface 301a of the bottom cover and the horizontal surface 303a of the reflector are fixed by the fastening using the hook 307b, and the lamp fixing part 307a of the lamp guide 307 fixes the lamp 305. Fix it. The number of lamp guides 307 is formed in at least one or more, and the number may vary depending on the size of the liquid crystal display.

Next, the overall fixing principle of the bottom cover and the reflector will be described with reference to FIGS. 8 to 8A.

As described above, the reflector 303 is made of a material having elasticity. Accordingly, when the reflector 303 is pushed in the horizontal direction as shown in FIG. 8, the reflector 303 maintains elasticity, and the horizontal plane 303a is bent upward as shown in FIG. 8A, or the horizontal plane 303b as shown in FIG. 8B. ) May be bent downward, or as shown in FIG. 8C, the deformation of the angle of inclination 303d between the inclined surface 303b and the vertical surface 303c may be reduced without deformation of the horizontal surface 303a.

However, the lower part of the horizontal surface of the reflector 303 is in contact with the first horizontal surface (301a of FIG. 6) of the bottom cover, and the upper part is also fastened by the lamp guide (307 of FIG. 6). 8A and 8B cannot be modified. Therefore, as shown in FIG. 8C, the angle of inclination 303d between the inclined surface 303b and the vertical surface 303c of the reflector may be reduced and only deformed. At this time, after the deformation has an elastic force in the opposite direction of the force given from the outside by the elasticity of the material itself constituting the reflector 303. Since the vertical surface of the bottom cover (301b of FIG. 6) and the vertical surface of the reflector (303c of FIG. 6) are brought into contact with each other by the elastic force, the reflector 303 maintains a constant shape and the bottom cover (301 of FIG. 6). It is fixed in the inner surface of the

The first embodiment of the present invention has been described above, and then the second embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view of a second embodiment of the present invention, in which a portion corresponding to the line AA ′ of FIG. 3 is an exploded view of a conventional structure.

First, the components will be described. The bottom cover 301, the reflector 303, the plurality of lamp guides 307, the plurality of lamps 305, the optical sheet 309, the support main 311, and the liquid crystal panel are sequentially formed from the bottom. 313 and a top case 315, the plurality of second bolts 317 fastened to the bottom cover 301 through the support main 311 and the bottom cover through the top case 315. A plurality of third bolts 319 fastened to 301 to be part of the components is the same as the first embodiment of the present invention. In this case, the optical sheet 309 may be composed of a diffusion sheet 309c, a prism sheet 309b and a protective sheet 309a. However, in the second embodiment, the protrusion 321 is formed on the vertical surface 301c of the bottom cover, which is different from the first embodiment.

Next, a characteristic part of the components will be described. As shown in FIG. 7, the bottom cover 301 has the first horizontal plane 301a and the second horizontal plane 301c respectively as in the first embodiment. 301b and at right angles. The reflector 303 also has an obtuse angle between the horizontal surface 303a and the inclined surface 303b, and the oblique angle between the inclined surface 303b and the vertical surface 303c is an acute angle, which is the same as the first embodiment. The material of the reflector 303 may also be a polyethylene terephthalate (PET) having a thickness of 0.7 mm to 1.0 mm or a metal having elasticity, and the configuration and role of the lamp guide 307 may be the same as in the first embodiment.

Next, the features of the second embodiment that are different from the first embodiment will be described.

In the bottom cover 301 of the second embodiment, a protrusion 321 is formed on the vertical surface 301c as shown in FIG. The protrusion 321 is formed adjacent to the bent portion of the inclined surface 303b and the vertical surface 303c of the reflector, the role of which is to facilitate the operation when fixing the reflector 303 to the bottom cover 301. have.

Also in the second embodiment, the reflector 303 is made of a material having elasticity, and when the bottom cover 301 is assembled with the inclined surface 303b and the vertical surface 303c without deformation of the horizontal surface 303a as shown in FIG. 8C. The deformation occurs that the angle of inclination (303d in FIG. 8) becomes small. Looking at the assembly process, first the reflector 303 is positioned on the inner surface of the bottom cover 301 while maintaining the elastic force before the lamp guide 307 is fastened, wherein the reflector 303 is still the lamp guide 307 ) Is not fastened to maintain the intermediate form of the modified form of FIGS. 8A and 8C. If the protrusion 321 is not formed on the vertical surface 301c of the bottom cover as in the first embodiment, the reflector 303 may be out of the position necessary for assembly due to the elastic force of the intermediate shape. However, when the protrusion 321 is formed on the vertical surface 301c of the bottom cover as in the second embodiment, the horizontal surface 303a of the reflector may be deformed upward, but the position of the vertical surface 303c is 321) can be processed tablets. Therefore, when the lamp guide 307 is fastened, work effort may be reduced.

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

As described above, the liquid crystal display of the present invention is formed by bending the reflector in a predetermined form, and fixing the reflector to the bottom cover without using the double-sided tape used in the prior art by using the reflector's elastic force and the lamp guide. It is possible to let.

In addition, the structure in which the protrusion is formed on the vertical surface of the bottom cover also has an advantageous effect that the work effort can be significantly reduced during the fastening using the lamp guide.

Claims (11)

A bottom cover having a perpendicular angle between the first horizontal plane and the vertical plane; A reflector having a horizontal plane and an inclined plane at an obtuse angle, and the inclined plane and a vertical plane having an acute angle; At least one lamp formed on a horizontal plane of the reflector; At least one lamp guide fixing the lamp and coupling the first horizontal plane of the bottom cover and the horizontal plane of the reflector; An optical sheet formed on the lamp; And Liquid crystal display comprising a support main surrounding the optical sheet. The method of claim 1, And a horizontal plane and a vertical plane of the reflector abut on the first horizontal plane and the vertical plane of the bottom cover. The method of claim 2, And the vertical surface of the bottom cover and the reflector, which are in contact with each other, are fixed by elasticity of the reflector. The method of claim 1, While fixing the lamp, the lamp guide for coupling the first horizontal plane of the bottom cover and the horizontal plane of the reflector, The hook type liquid crystal display device, characterized in that for coupling the first horizontal plane of the bottom cover and the horizontal plane of the reflector. The method of claim 1, The optical sheet formed on the lamp, Liquid crystal display device comprising a diffusion sheet, a prism sheet and a protective sheet. The method of claim 1, The bottom cover is, A liquid crystal display device characterized in that a projection is formed on the vertical surface. The method of claim 6, The protrusion, And a curved portion of the inclined surface and the vertical surface of the reflector. The method of claim 1, The reflector, A liquid crystal display device comprising a material having elasticity. The method of claim 8, The elastic material is, Liquid crystal display device characterized in that the PET (Polyethylene Terephthalate). The method of claim 9, The reflector made of polyethylene terephthalate (PET), The liquid crystal display device, characterized in that the thickness is 0.7mm ~ 1.0mm. The method of claim 8, The elastic material is, Liquid crystal display device characterized in that the metal.

Images