KR101429488B1 - Liquid Crystal Display - Google Patents

Abstract

The present invention relates to a liquid crystal display device with a backlight unit unit type in which a backlight unit constituting a light source unit and a liquid crystal panel constituting an image unit are simply assembled as a module and has an upper side wall formed along the edge of the plate, A back cabinet to provide space; An LED array having a plurality of LEDs mounted on a substrate and having an emitting surface of the LEDs inserted into the LED housing so as to face the opening, A light source module disposed therein; A light conversion member including a light guide plate disposed with the light incidence surface inserted into the opening of the LED housing and an optical sheet disposed on the light guide plate; A rectangular frame which is opened at the center to form a window, a lower sidewall formed along two mutually opposing two side edges of the frame, and a flange extending inward from the frame or lower sidewall in which the lower sidewall is formed, A front cabinet having a pair of guide grooves and fastened to a back cabinet; And a liquid crystal panel slidably inserted into the guide groove of the front cabinet.

Description

[0001] Liquid crystal display [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a backlight unit-integrated liquid crystal display device in which a backlight unit constituting a light source unit and a liquid crystal panel constituting an image unit are assembled together as a single module.

BACKGROUND ART A liquid crystal display (Liquid Crystal Display) is a passive optical element that can not emit light by itself, and is necessarily provided with a backlight unit for providing light to a liquid crystal panel. In this case, depending on the structure of the backlight unit, not only the image characteristics of the liquid crystal display but also the overall physical properties such as the thickness and the screen size are greatly influenced.

FIG. 1 is an assembled cross-sectional view illustrating a conventional liquid crystal display device, and FIG. 2 is a sectional view illustrating an assembled structure of a conventional liquid crystal display device Sectional view of the device). As shown in the drawing, a conventional liquid crystal display includes a backlight unit 10 and a liquid crystal panel 21 on one side of the backlight unit 10, And a front cabinet 31 and a back cabinet 32 are fastened to the front and rear surfaces of the liquid crystal display module 20 to form a liquid crystal display module 20 So that the liquid crystal display device 30 is formed.

Here, the backlight unit 10 functions as a backlighting light source of the liquid crystal display device 30. The reflection sheet 12 and the light guide plate 13 are seated in the cover bottom 11, An LED light source 14 is disposed on one side and various optical sheets 15 are laminated on the upper side of the light guide plate 13 and finally the guide panel 16 is placed on the cover bottom 11 As shown in Fig. The backlight unit 10 is fabricated and assembled in a separate process from the liquid crystal panel 21, the front cabinet 31, and the back cabinet 33. That is, after the backlight unit 10 is manufactured in a predetermined module form and transferred to another assembling process, the liquid crystal panel 21 is assembled to the front surface of the backlight unit 10 and then the front cabinet 33 and the back cabinet 31 are assembled to complete the liquid crystal display device.

2, a backlight unit 10 is primarily assembled as shown in (a), and a modularized backlight unit 10 (b) as shown in (b) is assembled, The liquid crystal panel 21 is fixed by the top case 22 to the liquid crystal display module 20 and the front cabinet 33 and the back cabinet 31 are finally assembled as shown in FIG. The liquid crystal display device 30 is completed. At this time, a plurality of support pieces 32 are formed in the back cabinet 31 to secure a predetermined space with the backlight unit 10, and a driving unit 34 for driving the liquid crystal panel 21 is disposed in the secured space do.

That is, in the conventional liquid crystal display device, the backlight unit is assembled in a module form as a backlighting light source for irradiating light to the liquid crystal panel, and in the separate process, the liquid crystal panel 21, the front cabinet 31, (32) are assembled. Therefore, many components are used for the manufacture of the liquid crystal display device, and an additional assembly process is required. This increases the manufacturing cost of the liquid crystal display device, complicates the assembling process, and lowers the productivity of the product.

In addition, the use of many assemblies increases the thickness of the liquid crystal display device, which limits the slimming of the liquid crystal display device.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a backlight unit and a liquid crystal panel constituting a liquid crystal display device, which can reduce the number of parts of a liquid crystal display device, And it is an object of the present invention to provide a backlight unit-integrated liquid crystal display device capable of reducing the manufacturing cost.

Another object of the present invention is to provide a backlight unit-integrated liquid crystal display device having a structure in which the number of assembled parts of a liquid crystal display device can be reduced to make a product slim.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a back cabinet having an upper side wall formed along an edge of a rectangular plate to provide a storage space therein; An LED housing having a light source insertion groove in which an LED array is slidably inserted along a longitudinal direction and a light guide plate insertion groove into which a light guide plate is inserted through an opening having a width narrower than that of the light source insertion groove, An LED array in which a plurality of LEDs are mounted on the light guide plate and a light emitting surface of the LED is inserted into the LED housing so as to face the opening, A backlighting module comprising the module; And a rectangular frame which is opened at the center to form a window, a lower sidewall formed along opposite side edges of the frame, and a flange extending inward from the frame in which the lower sidewall or the lower sidewall is formed And a liquid crystal panel module comprising a front cabinet having a pair of opposing guide grooves and a liquid crystal panel slidingly inserted along guide grooves of the front cabinet, wherein the backlighting module is disposed in an inner storage space of the back cabinet And the liquid crystal panel module is assembled while being fastened to the back cabinet on the upper side of the backlighting module by fastening means formed on the upper side wall of the back cabinet and the lower side wall of the front cabinet.

Here, the front cabinet may further include a guide member made of an elastic material for fixing the liquid crystal panel between the frame forming the guide groove and the liquid crystal panel.

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According to the present invention having the above-described structure, since the backlight unit and the liquid crystal panel constituting the liquid crystal display device constitute one module, the number of parts of the liquid crystal display device can be reduced, the assembling process can be simplified, Can be saved.

In addition, the present invention can reduce the number of assembled parts to make the liquid crystal display slim.

1 is an assembled cross-sectional view illustrating a liquid crystal display device according to a conventional technique,
2 is an exploded sectional view showing an assembling structure of the liquid crystal display device of FIG. 1,
3 is a perspective view illustrating a liquid crystal display device according to an embodiment of the present invention,
4 is an exploded perspective view showing the liquid crystal display device of FIG. 3,
FIG. 5 is an assembled cross-sectional view along AA in the liquid crystal display device of FIG. 3,
FIG. 6 is a sectional view of the liquid crystal display device of FIG. 3 in the BB direction,
7 is an exploded perspective view showing an assembling structure of the light source part which is the main part of Fig. 3, and Fig.
8 is an exploded perspective view showing an assembling structure of the liquid crystal panel which is the main part of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. The following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an exploded perspective view illustrating a liquid crystal display device according to an embodiment of the present invention, FIG. 4 is an exploded perspective view illustrating the liquid crystal display device of FIG. 3, and FIGS. 5 and 6 are cross- Sectional views showing bonding structures in AA and BB directions, respectively. As can be seen from these drawings, the liquid crystal display of the present invention includes a back cabinet 100, a front cabinet 500, a light conversion member 200, a light source module 300, and a liquid crystal panel 400). Here, the back cabinet 100 and the front cabinet 500 are the lower panel and the upper panel of the liquid crystal display, respectively, and form an outer housing of the liquid crystal display that houses the respective components therein.

Specifically, the back cabinet 100 is a rear housing for housing therein components constituting a liquid crystal display device. The back cabinet 100 has an upper side wall 120 formed along the edge of the rectangular panel 110, And a storage space is formed therein. In the back cabinet 100, a light source space 130 in which the light source module 300 can be disposed is secured to one side of the rectangular internal space or to both sides facing each other. Further, a space in which a driving circuit (not shown) can be disposed can be secured inside or outside the back cabinet 100.

The front cabinet 500 is a front housing that is fastened to the back cabinet 100 to stably fix the components housed in the back cabinet 100 and to store the liquid crystal panel 400 therein. The front cabinet 500 is formed with a lower side wall 520 formed along the edge of the rectangular frame 510 forming the window 550 with its central portion opened to open the lower portion. Particularly, in the present invention, a guide groove 540 for accommodating the liquid crystal panel 400 is provided along the opposite side frames 510. That is, the front cabinet 500 is formed with a flange 530 extending inwardly from the frame 510 facing each other, and a guide groove 540 having a predetermined gap between the frame 510 and the flange 530 . At this time, one side of the rectangular frame 510 or opposite side portions thereof are opened in a state where the lower side wall 520 is not formed, so that the liquid crystal panel 400 can be slidably inserted into the guide groove 540. One or both openings of the front cabinet 500 are sealed by the top sidewall 120 of the back cabinet 100 when fastened to the back cabinet 100.

5, the flange 530 includes an inclined portion 530a extending downward from the frame 510 to have a predetermined inclination and a horizontal portion 530b extending horizontally at an end of the inclined portion, A guide groove 540 having a predetermined gap is formed between the frame 510 and the horizontal portion 530b. At this time, the vertical width of the guide groove 540 should be at least slightly larger than the thickness of the liquid crystal panel 400. The flange 530 may extend from the frame 510 as shown, but may extend from the lower side wall 520 inwardly.

The back cabinet 100 and the front cabinet 500 are formed with fastening grooves 121 and fastening protrusions 521 in the upper side wall 120 and the lower side wall 520 for fastening. As shown in the drawing, a coupling groove 121 is formed on the outer surface of the upper side wall 120 of the back cabinet 100, and a coupling groove 121 is formed on the inner surface of the lower side wall 520 of the front cabinet 500 121 are formed. At this time, it is preferable that the fastening groove 121 and the fastening protrusion 521 have a wedge shape so that fastening is easy, strong fastening force is exhibited, and the fastening protrusion 521 can be prevented from being separated. A plurality of fastening protrusions 121 and fastening protrusions 521 are formed at predetermined intervals along the respective side walls to firmly fasten the back cabinet 100 and the front cabinet 500.

The light conversion member 200 has a structure in which the light of the point light source by the LED 322 is converted into a surface light source and the optical characteristics are improved. The light conversion member 200 includes a planar light guide plate 220, And an optical sheet 230 laminated on the light guide plate 220 and the light guide plate 220. Here, the light guide plate 220 converts the light of the point light sources incident on the plurality of LEDs 322 into total light through total internal reflection, and emits the light to the upper surface. Further, the optical sheet 230 is composed of a prism sheet, a brightness enhancement film, etc., and scattering and condensing light emitted to the upper part to improve appearance characteristics. The reflective sheet 210 reflects the light leaking to the lower portion of the light guide plate 220 to the inside of the light guide plate 220, thereby contributing to an increase in luminance.

The light source module 300 is a backlighting light source of a liquid crystal display and comprises an LED housing 310 and an LED array 320 inserted into an inner space of the LED housing 310.

The LED housing 310 has a 'C' shape having a pair of horizontal surfaces extending to one side at both ends of a vertical plane and a vertical plane, and the LED housing 310 is opened at one side. The LED housing 310 accommodates the LED array 320 as a light source therein so that light emitted from the LED 322 can be incident into the light guide plate 220 without leakage. For this, the LED array 310 has a 'C' shape having only one side thereof opened, and the inner side of the inner space forms a light source insertion groove (refer to 310a in FIG. 7) into which the LED array 320 is inserted, (Refer to 310b in Fig. 7) into which the end portion of the light guide plate 220 is inserted. At this time, in order to prevent light leakage, the light guide plate insertion groove 310b preferably has a smaller width than the light source insertion groove 310a. Also, the LED housing 310 may have a reflective layer formed on the inner surface thereof so as to reflect light that is emitted from the LED 322 and can not be incident directly into the light guide plate, and may be incident on the light guide plate. And is made of a material having excellent thermal conductivity so as to be efficiently discharged.

The LED array 320 is a light source in which a plurality of LEDs 322 are spaced apart at regular intervals and a plurality of LEDs 322 are mounted on the substrate 321 having a predetermined length at regular intervals. The LED array 320 is disposed in the inner space of the LED housing 310 and emits light toward the light guide plate 220 inserted in the outer space of the LED housing 310.

The liquid crystal panel 400 is configured to implement an image according to an electrical signal transmitted from a driving unit. The liquid crystal panel 400 is arranged such that a TFT substrate and a color filter substrate partitioned into a plurality of cells face each other and a liquid crystal is injected therebetween. The liquid crystal panel 400 is fixed between the frame 510 and the flange horizontal portion 530b while sliding along the guide groove 540 of the front cabinet 500. [ At this time, a guide member 410 of elastic material may be interposed between the frame 510 and the liquid crystal panel 400 to prevent the liquid crystal panel 400 from being damaged. The guide member 410 may have a belt-like shape in which squares are connected to each other, or a quadrangle may be formed as shown in FIG. A COF (Chip on Film) (not shown) for supplying a signal to the gate line and the data line of the TFT is connected to one edge of the liquid crystal panel 400, and the COF is connected to the inside of the storage space of the back cabinet 100 (Not shown) installed in the outer space.

Hereinafter, an assembly process of the liquid crystal display device having the above structure will be described. FIG. 7 is an exploded perspective view showing an assembling structure of the light source module which is the main part of FIG. 3, and FIG. 8 is an exploded perspective view illustrating an assembly structure of the liquid crystal panel, which is a main part of FIG.

7, the assembly of the light source module 300 is performed by sliding the LED array 320 along the light source insertion groove 310a of the LED housing 310. As shown in FIG. That is, the LED housing 310 according to the present invention is formed in a 'C' shape so that one side is opened to form a light source insertion groove 310a in the inner space, and the LED array 320 is formed on one surface of the substrate 321 A plurality of LEDs 322 are mounted at regular intervals. The substrate 321 of the LED array 320 is inserted and fixed in the LED housing 310 along the light source insertion groove 310a of the LED housing 310. [ At this time, the LED array 320 can be stably fixed in the light source insertion groove 310a as the substrate 321 is fixed in the space between the vertical wall on one side of the LED housing and the stepped wall on the other side.

After the LED housing 310 and the LED array 320 are assembled, the end portion of the light guide plate 220 is inserted along the light source insertion groove 310a formed in the outer opening of the LED housing 310. [ With this assembly, the light emitting surface of the LED 322 and the light incident surface of the light guide plate 220 are assembled so as to be adjacent to each other. At this time, the reflection sheet 210 is inserted before the light guide plate 220 is inserted.

4 and 5, the light source module 300 includes the light source space 130 formed on one side or both sides of the back cabinet 100 in the process of assembling the entire liquid crystal display device, . At this time, the light source module 300 and the light guide plate 220 may be assembled after the light source module 300 is disposed in the back cabinet 100.

8, both ends of the liquid crystal panel 400 are inserted while being slid along the guide grooves 540 of the front cabinet 500. As shown in FIG. That is, since the front cabinet 500 according to the present invention forms the guide grooves 540 between the pair of opposed frames 510 and the horizontal portions 530b of the flanges 530, Both ends are assembled while being inserted along the guide groove 540. 4) is interposed between the frame 510 and the liquid crystal panel 400. The liquid crystal panel 400 is fixed by the frame 510 and the horizontal portion 530b of the flange And is stably fixed to the front cabinet 500 while being guided.

The front cabinet 500 in which the liquid crystal panel 400 is assembled as described above is assembled to the back cabinet 100 as shown in FIGS. At this time, the optical sheet 230 is stacked on the upper surface of the assembled light guide plate 220 and the horizontal portion 530b of the flange 530 is guided by the front cabinet 500 to guide the optical sheet 230, Thereby fixing the sheet 230. After the front cabinet 500 is assembled, the liquid crystal display device can be completed by the electrical connection between the liquid crystal panel 400 using the COF and the driving unit (not shown).

The liquid crystal display device of the present invention having such an assembling structure has a structure in which the backlight unit and the liquid crystal panel are integrally formed, thereby reducing the number of components, reducing the manufacturing cost, and simplifying the assembling process.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

100: back cabinet 110: panel
120: upper side wall 130: light source space
200: photo-conversion member 210: reflective sheet
220: light guide plate 230: optical sheet
300: light source module 310: LED housing
320: LED array 400: liquid crystal panel
500: front cabinet 510: frame
520: lower side wall 530: flange
530a: an inclined portion 530b:
540: guide groove 550: window

Claims (4)

A back cabinet having an upper side wall formed along an edge of a rectangular plate to provide a storage space therein;
An LED housing having a light source insertion groove in which an LED array is slidably inserted along a longitudinal direction and a light guide plate insertion groove into which a light guide plate is inserted through an opening having a width narrower than that of the light source insertion groove, An LED array in which a plurality of LEDs are mounted on the light guide plate and a light emitting surface of the LED is inserted into the LED housing so as to face the opening, A backlighting module comprising the module; And
A rectangular sidewall having a central portion open to form a window, a lower sidewall formed along opposite side edges of the frame, and a flange extending inwardly from the frame formed with the lower sidewall or the lower sidewall, And a liquid crystal panel module including a liquid crystal panel slidingly inserted along a guide groove of the front cabinet, the module comprising: a front panel having a pair of guide grooves,
The liquid crystal panel module is fastened to the back cabinet from above the backlighting module by fastening means formed on the upper side wall of the back cabinet and the lower side wall of the front cabinet, And the liquid crystal display device is assembled with the liquid crystal display device. The front cabinet according to claim 1,
Further comprising an elastic guide member for fixing the liquid crystal panel between the frame forming the guide groove and the liquid crystal panel.
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