KR20080067851A - Backlight assembly and liquid crystal display device including the same - Google Patents

Abstract

A backlight assembly and an LCD(Liquid Crystal Display) having the same are provided to prevent the bending of a diffusion plate even at a high temperature and improve defects of diffusion sheets by fixing the diffusion plate to a bottom chassis. A backlight assembly(100) comprises a light source(140), a diffusion plate(120), diffusion sheets(110), a reflective sheet(150), and a bottom chassis(160). The light source, composed of a plurality of lamps, generates light. The diffusion plate, located above the light source, uniforms the light emitted from the light source. The diffusion plate comprises the first protrusion part(121) which is formed at a side of the diffusion part. The diffusion sheets, arranged above the diffusion plate, diffuse light. The reflective sheet, located below the light source, reflects light, leaked downwards from the light source, upwards. The bottom chassis receives the light source, the diffusion plate, the diffusion sheets, and the reflective sheet. At a side of the bottom chassis, the second protrusion part which is combined with the first protrusion part is formed.

Description

Backlight assembly and liquid crystal display device including the same

1 is an exploded perspective view of a backlight assembly according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 taken along the line II-II '.

3 is a cross-sectional view taken along the line III-III ′ of FIG. 1.

4 is a view illustrating a structure in which the diffusion plate and the lower storage container of FIG. 1 are combined.

5 is an exploded perspective view of a liquid crystal display including the backlight assembly of FIG. 1.

(Explanation of symbols for the main parts of the drawing)

100: backlight assembly 110: diffusion sheets

120: diffusion plate 121: first protrusion

130: side mold 140: lamp

145: optical member support 150: reflective sheet

160: lower storage container 165: socket

166: second projection 300: the upper storage container

400: liquid crystal display

The present invention relates to a backlight assembly and a liquid crystal display including the same. More particularly, the present invention relates to a backlight assembly having an improved warpage phenomenon of a diffusion plate and a liquid crystal display including the same.

The liquid crystal display displays an image using a liquid crystal whose light transmittance is changed according to an electric field. In this case, the liquid crystal plays only a role of adjusting the transmittance of light supplied from the outside. For this reason, the liquid crystal display requires light provided from the outside.

The liquid crystal display device may be composed of a liquid crystal panel that displays an image largely and a backlight assembly positioned under the liquid crystal panel to provide light.

In this case, the backlight assembly may include a light source, a diffuser plate positioned above the light source to equalize the light emitted from the light source, a diffusion sheet for diffusing the light, and a reflection positioned below the light source to reflect the light leaking downward from the light source. It includes a sheet and a lower container for storing them.

In the backlight assembly, the diffusion plate is bent toward the liquid crystal panel under high temperature conditions such as a high temperature reliability test. The curved diffusion plate presses the diffusion sheet located above the diffusion plate, causing wrinkles on the diffusion sheet. Such defects of the diffusion sheet result in a decrease in display quality.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a backlight assembly having improved warpage of a diffusion plate.

Another object of the present invention is to provide a liquid crystal display device including the backlight assembly.

The technical problems of the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The backlight assembly according to an embodiment of the present invention for achieving the above technical problem is to equalize the light emitted from the light source and the light emitted from the light source is located above the light source and formed in a protrusion shape on at least one side 1 a diffusion plate including a protrusion, a diffusion sheet positioned above the diffusion plate to diffuse light, a reflection sheet positioned below the light source to reflect light leaking from the light source downward, and the diffusion And a lower storage container accommodating a sheet, the diffusion plate, the light source, and the reflective sheet, and having a second protrusion formed on at least one side thereof and coupled to a first protrusion formed on the diffusion plate.

In accordance with another aspect of the present invention, a liquid crystal display device includes a light source for generating light, a light source positioned above the light source, and equalizing the light emitted from the light source. A diffusion plate including a formed first protrusion, a diffusion sheet positioned above the diffusion plate to diffuse light, a reflection sheet positioned below the light source and reflecting light leaked downward from the light source to the top; A backlight assembly containing a diffusion sheet, the diffusion plate, a plurality of the light sources and the reflection sheet, and a lower accommodation container having a second protrusion formed on at least one side thereof and coupled to a first protrusion formed on the diffusion plate; Located above the backlight assembly, an image is generated using light supplied from the backlight assembly. It comprises a liquid crystal display panel.

Other specific details of the invention are included in the detailed description and drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, with reference to the accompanying drawings will be described embodiments of the present invention;

A backlight assembly according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

1 is an exploded perspective view of a backlight assembly according to an exemplary embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1 taken along a line II-II ', and FIG. 3 is a line taken along line III-III' of FIG. 1. It is a cross section which cut along.

The backlight assembly 100 may include a plurality of lamps 140, a reflective sheet 150, a side mold 130, a diffusion plate 120, diffusion sheets 110, and a lower container 160. It is configured to include.

The lamp 140 is positioned under the liquid crystal panel (not shown) and provides light to the liquid crystal panel. The lamp 140 may be, for example, a light emitting diode (LED), a cold cathode fluorescent lamp (CCFL), an external electrofluorescent lamp (EEFL), or the like. The lamp 140 may be configured as a direct type in which a plurality of phases are arranged in a uniform distance. In addition, the lamp 140 is inserted into and fixed to the socket 165 through the plurality of through holes 135 formed in the side mold 130, and is exposed between the side molds 130 facing each other to emit light. Here, the socket 165 may be fixed to an alignment plate (not shown) disposed on the rear surface of the lower storage container 160 and disposed at an edge of the lower storage container 160. The socket 165 may provide a driving voltage to an electrode of the lamp 140. It may include a predetermined voltage applying means (not shown) to provide.

The reflective sheet 150 is positioned below the lamp 140 to reflect the light leaking from the lamp 140 upward. Here, the reflective sheet 150 may be a material having good elasticity, excellent light reflection, and thinness. For example, as the reflective sheet 150, micro polyethylene terephtalate (MCPET) may be used, but is not limited thereto. In addition, an optical member supporter 145 for supporting the central portion of the diffusion plate 120 may be positioned on the reflective sheet 150.

The optical member supporter 145 may be positioned at the center of the reflective sheet 150 and may be fixed to the lower storage container 160. The optical member support 145 may be made of a transparent material to minimize the loss of light emitted from the lamp 140.

The side mold 130 may be positioned at both ends of the lamp 140, for example, adjacent to both ends of the electrode of the lamp 140. Here, the side mold 130 may be formed, for example, in a straight shape, and is coupled to the lower receiving container 160 to fix the lamp 140.

Specifically, referring to FIG. 2, the side mold 130 may be positioned adjacent to short-axis sides of the reflective sheet 150 facing each other, and the upper surface 131, the outer wall 132, and the outer wall 132 may be disposed. It may be configured to include an inner wall 133 connected to.

The inner wall 133 may be an inclined inner wall 133 which protrudes from the outer wall 132 and is inclined downward, and has a predetermined support end 134. The support end 134 may have a predetermined step with the top surface 131 of the side mold 130, and the diffusion plate 120 and the diffusion sheets 110 may be seated.

A plurality of through grooves 135 are formed at the lower end of the inclined inner wall 133. Here, the through groove 135 may be coupled to the lamp 140 and may fix the lamp 140. In other words, the through groove 135 may serve as a kind of passage allowing the lamp 140 to be coupled to the socket 165, and specifically, the inclined inner wall 133 of each side mold 130 facing each other. A plurality of through grooves 135 are positioned at the lower end of the) so as to face each other, and both ends of the lamp 140 may be positioned on the opposite through grooves 135. In addition, the inclined inner wall 133 may be made of a light reflective resin, for example, white polycarbonate (PC), in order to reflect light emitted from the lamp 140, but is limited to this as long as the material has excellent reflectivity. It doesn't work.

A predetermined space may be formed between the bottom surface of the outer wall 132 and the bottom surface of the inclined inner wall 133, which may be, for example, a socket coupling groove 137 to which the socket 165 is coupled. Here, the socket coupling groove 137 may be formed in the longitudinal direction of the side mold 130, for example, in the longitudinal length direction, and the socket 165 may be coupled to the socket 165 coupled to the lower storage container 160. Avoid exposure to the outside. Therefore, the lamp 140 coupled to the socket 165 is fixed to the outside through the through groove 135 formed in the inclined inner wall 133 of the side mold 130.

A diffusion plate 120 and a plurality of diffusion sheets 110 that collect and diffuse light emitted from the lamp 140 are disposed above the lamp 140.

The diffusion plate 120 may be provided in a plate shape, and two sides of the opposite short axis may be seated on the support end 134 of the side mold 130. In addition, as described above, the center portion of the diffusion plate 120 may be supported / fixed by the optical member support 145. Here, the optical member supporter 145 may contact the lower portion of the diffusion plate 120 to prevent sagging of the diffusion plate 120. In addition, a plurality of diffusion sheets 110 may be positioned on the diffusion plate 120. The diffusion sheets 110 serve to diffuse light transmitted from the lamp 140 through the diffusion plate 120, and a prism sheet, a protective sheet, and the like may be positioned on the diffusion sheets 110. .

The lower storage container 160 has a rectangular shape and side walls are formed along the edge of the bottom surface, and the diffusion plate 120, the diffusion sheets 110, the plurality of lamps 140, and the side mold 130 are formed inside the side wall. ) And the reflective sheet 150. The upper end of the short sidewall of the lower housing 160 may be covered by the upper surface 131 of the side mold 130.

In general, the backlight assembly bends the center of the diffusion plate toward the liquid crystal panel under high temperature conditions such as a high temperature reliability test. The curved diffusion plate presses the diffusion sheet located above the diffusion plate, causing wrinkles on the diffusion sheet. Since the defect of the diffusion sheet consequently lowers the display quality, it is necessary to improve the warpage phenomenon of the diffusion plate.

In addition, there is a need for a backlight assembly having improved defects in a diffusion sheet due to warpage of a diffusion plate, which may be generated at a high temperature while generating heat due to an increase in the number of lamps and an increase in a lamp driving current.

The backlight assembly 100 according to the embodiment of the present invention is the bending of the diffusion plate 120 due to the combination of the first protrusion 121 of the diffuser plate 120 and the second protrusion 166 of the lower receiving container 160. By preventing the phenomenon, defects such as wrinkles of the diffusion sheet 110 positioned on the diffusion plate 120 may be improved.

Hereinafter, the coupling structure of the diffusion plate and the storage container will be described in detail with reference to FIGS. 3 and 4. 4 is a view illustrating a structure in which the diffusion plate and the lower storage container of FIG. 1 are combined.

The diffusion plate 120 includes a first protrusion 121 formed in a protrusion shape on at least one side. At least one first protrusion 121 is formed at a long side of the diffusion plate 120 to protrude to the outside of the diffusion plate 120.

The lower receiving container 160 coupled with the diffusion plate 120 includes a second protrusion 166 formed at least on one side in a protrusion shape. At least one second protrusion 166 is formed at a long side of the lower receiving container 160, and protrudes into the lower receiving container 160 at a position corresponding to the first protrusion 121 of the diffusion plate 120. Formed.

Referring to FIG. 3, a reflective sheet 150, a plurality of lamps 140, and a diffuser plate 120 are sequentially disposed below the second protrusion 166 of the lower storage container 160, and the second protrusion 166 is disposed in this order. The diffusion sheet 110 is located at the top.

Since the diffusion plate 120 is accommodated under the second protrusion 166 formed in the lower receiving container 160, the second protrusion 166 is positioned above the first protrusion 121 formed in the diffusion plate 120. To combine. The combination of the first protrusion 121 formed on the diffusion plate 120 and the second protrusion 166 formed on the lower accommodation container 160 serves to fix the diffusion plate 120 to the lower storage container 160. By preventing the warpage of the diffusion plate 120, the defect of the diffusion sheet 110 may be improved.

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

Referring to FIG. 5, the liquid crystal display device 400 includes the liquid crystal panel 210 and the backlight assembly 100 as a whole.

The liquid crystal panel 210 serves to display an image, and a liquid crystal layer (not shown) formed between the first display panel 211, the second display panel 213, and the first display panel 211 and the second display panel 213. It includes.

The first display panel 211 includes a plurality of gate lines having a predetermined interval and extending in the first direction, and a plurality of data lines, gate lines, and data lines extending in the second direction and arranged at regular intervals so as to intersect the gate line. A thin film transistor is formed in the pixel area defined by the pixel electrode and the gate line, which are switched by signals of the matrix electrode, to transfer the signal of the data line to each pixel electrode.

The second display panel 213 is provided with a light blocking pattern for blocking light in portions except the pixel area, an RGB color pattern for expressing color colors, and a common electrode for implementing an image.

The first display panel 211 and the second display panel 213 are bonded by sealant, frit glass, or the like in a state where a predetermined interval is maintained by a spacer, and a liquid crystal layer having optical anisotropy is formed therebetween.

A printed circuit board (PCB) 218 is electrically connected to one side of the liquid crystal panel 210 by a tape carrier package (TCP) 217. On the printed circuit board 218, a plurality of electronic components for generating driving and control signals of the liquid crystal panel 210 are mounted in a surface mount technology method. In addition, the tape carrier package 217 is equipped with a driving chip for driving the liquid crystal panel 210 in the center portion. The printed circuit board 218 and the tape carrier package 217 apply driving signals and timing signals to the gate lines and the data lines of the first display panel 211 so as to control the arrangement angle of the liquid crystals and the timing when the liquid crystals are arranged. Here, the printed circuit board 218 may be bent to the rear side of the lower storage container 160 and attached to the lower storage container 160.

The backlight assembly 100 for supplying light to the liquid crystal panel 210 is positioned below the liquid crystal panel 210. As described above, the backlight assembly 100 may include the plurality of lamps 150, the reflective sheet 150, the side mold 130, the diffusion plate 120, the diffusion sheets 110, and the lower housing 160. And the like.

The upper receiving container 300 is coupled to the lower receiving container 160 of the backlight assembly 100 to accommodate the liquid crystal panel 210 and the backlight assembly 100 therein, and defines an effective display area of the liquid crystal panel 210. do. The upper receiving container 300 may be coupled to the lower receiving container 160 through a hook coupling or screw coupling, the present invention is not limited thereto.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

As described above, the backlight assembly and the liquid crystal display including the same have one or more of the following effects.

First, the diffusion plate may be fixed to the lower housing to prevent bending of the diffusion plate even at high temperatures, and to improve defects of the diffusion sheet.

Second, excellent image quality can be obtained by improving the defect of the diffusion sheet.

Claims (8)

A light source for generating light; A diffusion plate positioned above the light source to equalize the light emitted from the light source and including a first protrusion formed on at least one side in a protrusion shape; A diffusion sheet positioned above the diffusion plate to diffuse light; A reflection sheet positioned below the light source and reflecting light leaking downward from the light source upward; And And a lower storage container accommodating the diffusion sheet, the diffusion plate, the light source, and the reflective sheet, and having a second protrusion formed on at least one side thereof and coupled to a first protrusion formed on the diffusion plate. The method of claim 1, And at least one first protrusion protruding outward from the diffusion plate at a long side of the diffusion plate. The method of claim 1, At least one second protrusion is formed on a long side of the lower receiving container, and a backlight assembly is formed to protrude inward of the lower receiving container at a position corresponding to the first protrusion. The method of claim 1, And the second protrusion is positioned on the top of the first protrusion to be coupled. A diffuser plate comprising a light source for generating light, a first protrusion disposed on the light source and equalizing the light emitted from the light source, and having at least one first protrusion formed in a protrusion shape; A diffusion sheet for diffusing, a reflection sheet positioned below the light source and reflecting light leaking downward from the light source upward, the diffusion sheet, the diffusion plate, the light source, and the reflection sheet, and at least one side A backlight assembly including a lower accommodating container having a second protrusion formed therein to be coupled to a first protrusion formed on the diffusion plate; And And a liquid crystal panel positioned on the backlight assembly and configured to display an image by using light supplied from the backlight assembly. The method of claim 5, And at least one first protrusion is formed at a long side of the diffusion plate to protrude to the outside of the diffusion plate. The method of claim 5, At least one second protrusion is formed on a long side of the lower receiving container, and is formed to protrude to the inside of the lower receiving container at a position corresponding to the first protrusion. The method of claim 5, The second protrusion is positioned above the first protrusion to be coupled.

Images