KR20050079841A - Surface light source, back-light assembly having the same and display device having the same - Google Patents

Abstract

A surface light source device, a backlight assembly having the same, and a display device having the same are disclosed. The surface light source device includes a first substrate in which two edges adjacent to each other are formed to be cut, a second substrate having a shape corresponding to the shape of the first substrate, and an edge of the first and second substrates interposed therebetween. A light source body including a sealing member forming a sealed space between the second substrates, a space dividing member interposed between the first and second substrates for dividing the space into a plurality, and each discharge space for generating light And a discharge voltage applying member for generating a discharge in the. Such a surface light source device can further reduce the volume and weight of the backlight assembly and the display device having the same.

Description

A surface light source device, a backlight assembly having the same, and a display device having the same {SURFACE LIGHT SOURCE, BACK-LIGHT ASSEMBLY HAVING THE SAME AND DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a surface light source device, a backlight assembly having the same, and a display device having the same, and more particularly, to a surface light source device having a reduced volume and weight, a backlight assembly having the same, and a display device having the same.

In general, a liquid crystal display device (LCD) displays an image by using twist or dispersion of a liquid crystal under the influence of an electric field.

In order to realize this, the liquid crystal display includes a liquid crystal control module for controlling an liquid crystal by applying an electric field to the liquid crystal and a light providing module for supplying light to the liquid crystal control module.

The liquid crystal control module includes a pair of substrates facing each other, a pair of electrodes interposed between the substrates, and a liquid crystal interposed between the pair of electrodes.

The light supply module includes a light source for generating light and an optical member for changing an optical distribution of light generated from the light source.

The quality of the image displayed on the LCD depends on the type of light source. In general, a liquid crystal display device mainly uses a light emitting diode as a one-dimensional light or a cold cathode fluorescent lamp (CCFL) as a two-dimensional light. However, light emitting diodes or cold cathode ray tube lamps have low luminance uniformity of light, and thus require optical members such as diffusion sheets, prism sheets, and the like.

Also, in recent years, as the size of the liquid crystal display device increases, a large number of light sources are required, causing a number of unexpected problems.

These problems are overcome by the recently developed surface light source.

The surface light source device has a rectangular parallelepiped shape, and a plurality of discharge spaces are formed inside the surface light source device, and invisible rays are generated by discharge in each discharge space. Invisible light is converted into visible light by a fluorescent material applied to the inner wall of the surface light source device.

Such a surface light source device is accommodated in a receiving container, and the storage container is coupled to a case again. At this time, the fixing piece protrudes to the outside of the side wall on the side wall of the storage container, the fixing boss for supporting the fixing piece by fastening the fixing piece by a screw is disposed in the case.

However, this method has a problem in that the liquid crystal display is unnecessarily increased by the fixing piece protruding from the storage container.

Accordingly, the present invention has been made in view of such a conventional problem, and a first object of the present invention is to provide a surface light source device having a structure suitable for reducing the volume and weight of a display device.

It is also a second object of the present invention to provide a backlight assembly having the surface light source device.

In addition, a third object of the present invention is to provide a display device having the backlight assembly.

In order to realize the first object of the present invention, the present invention provides a first substrate, a second substrate having a shape corresponding to the shape of the first substrate, the first substrate being cut around a corner formed by two adjacent sides. A light source body including a sealing member interposed between the edges of the second substrates to form a sealed space between the first and second substrates, a space interposed between the first and second substrates to divide the space into a plurality Provided is a surface light source device including a splitting member and a discharge voltage applying member for generating a discharge in each discharge space to generate light.

In addition, in order to implement the second object of the present invention, the present invention relates to a surface light source device having a cutout formed around a corner formed by two sides having a rectangular parallelepiped shape, and a bottom surface contacting the surface light source device, and a surface light source device from the bottom surface. A receptacle body comprising sidewalls extending to enclose the sides of the first body and a first fixing portion extending in a direction perpendicular to the bottom surface to surround the incision from the body, the first fixing portion extending in a direction parallel to the bottom surface from the first fixing portion. Provided is a backlight assembly including a storage container including a storage container fixing part having a fixing part.

In addition, in order to implement the third object of the present invention, the present invention has a cut-out portion formed by cutting the periphery of the corner formed by two side surfaces in the shape of a plate, the surface light source device for generating light, the bottom surface in contact with the surface light source device A first fixture extending in a direction perpendicular to the bottom surface to wrap the incision from the body, the body including sidewalls extending to surround the sides of the surface light source device from the bottom surface, parallel to the bottom surface from the first fixing portion; A storage container including a fixing part having a second fixing part extending in a direction, and a housing containing the first storage container, the housing including a high information for screwing the second fixing part at a position of the second fixing part; And a display panel for converting light into image light including information.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Surface light source device

1 is an exploded perspective view of a surface light source device according to an embodiment of the present invention.

Referring to FIG. 1, the surface light source device 400 includes a light source body 100, a space dividing member 200, and a discharge voltage applying member 300.

The light source body 100 includes a first substrate 110, a second substrate 120, and a sealing member 130.

FIG. 2 is a plan view illustrating the first substrate of FIG. 1.

1 and 2, the first substrate 110 is a glass substrate having a shape similar to a cuboid. The first substrate 110 has four side surfaces 111, 112, 113, and 114, a first side 115 connected to the side surfaces 111, 112, 113, and 114, and a second side 116 facing the first side 115. Accordingly, the first substrate 110 has four corners 111a, 112a, 113a, and 114a where two adjacent side surfaces are formed to meet each other.

The periphery of the four edges 111a, 112a, 113a, and 114a is cut out of the first substrate 110. Hereinafter, reference numerals 111b, 112b, 113a, and 114b will be attached to the cut portions of the first substrate 110, respectively.

3 is a plan view illustrating a second substrate of FIG. 1.

1 and 3, the second substrate 130 is a glass substrate having a shape similar to a cuboid. The second substrate 130 has four side surfaces 131, 132, 133 and 134, a third side 135 connected to the side surfaces 131, 132, 133 and 134, and a fourth side 136 facing the third side 135. Accordingly, the second substrate 130 has four edges 131a, 132a, 133a, and 134a formed by two adjacent side surfaces.

The periphery of the four edges 131a, 132a, 133a, and 134a is cut out of the second substrate 130. Hereinafter, reference numerals 131b, 132b, 133a, and 134b will be assigned to the cut portions of the second substrate 130, respectively.

In the present embodiment, the first substrate 110 and the second substrate 130 have the same area and the same shape.

4 is a plan view of the sealing member illustrated in FIG. 1.

1 and 4, the sealing member 120 provides a sealed space between the first substrate 110 and the second substrate 130. Therefore, the sealing member 120 is interposed between the first substrate 110 and the second substrate 130, preferably the sealing member 130 is the edge of the first substrate 110 and the second substrate 130 Is interposed along. In the present embodiment, the sealing member 120 includes glass having the same coefficient of thermal expansion as the first substrate 110 and the second substrate 130.

Referring to FIGS. 1 and 3 again, the space dividing member 200 is interposed between the first substrate 110 and the second substrate 130, so that the space between the first substrate 110 and the second substrate 130 may be reduced. The space formed in between is divided into at least two. At least two discharge spaces 137 are formed between the first substrate 110 and the second substrate 130 by the space dividing member 200.

The space dividing member 200 is cured by heat with a flowable material including a ceramic or the like. The space dividing member 200 is formed in a wall shape on the third surface 135 of the second substrate 130 by a dispenser or the like, and then fired and cured in a high temperature furnace or the like.

In the present embodiment, the space dividing member 200 extends in the first direction, and the plurality of space dividing members 200 are arranged in parallel in a second direction substantially perpendicular to the first direction.

At this time, each of the space dividing members 200 is disposed so that each discharge space 137 has a serpentine shape. This is to equalize the amount of discharge gas injected into each discharge space 137 by each space division member 200.

FIG. 5 is a perspective view illustrating a combination of the surface light source device shown in FIG. 1.

Referring to FIG. 5, the first substrate 110, the space dividing member 200, and the second substrate 130 are coupled to each other through the sealing member 120. To this end, the adhesive is applied to the sealing member 120 or melted by heat to couple the first substrate 110 and the second substrate 130 to each other.

Accordingly, the light source body 100 including the first substrate 110, the sealing member 120, and the second substrate 130 has a rectangular parallelepiped shape as a whole, and the edge portion where the adjacent side surfaces of the light source body 100 meet each other. It has a partially cut shape. In this case, a discharge gas is injected into the light source body 100, and the discharge gas includes mercury, argon, neon, xenon, krypton, and the like, and the discharge gas generates invisible light, for example, ultraviolet rays by discharge. do.

Referring back to FIGS. 1 and 2, a pair of discharge voltage applying members 300 is disposed on an outer surface of the light source body 100. In the present embodiment, the discharge voltage applying member 300 includes a first electrode 310 and a second electrode 320. The first electrode 310 and the second electrode 320 are respectively disposed at both ends of the space dividing member 200 extending in the first direction. At this time, the discharge voltage applying member 300 extends in a second direction substantially perpendicular to the space dividing member 200.

The first discharge voltage is applied to the first electrode 310 of the discharge voltage applying member 300, and the second discharge voltage is applied to the second electrode 320 of the discharge voltage applying member 300. At this time, the voltage difference between the first discharge voltage and the second discharge voltage should be sufficient to move the electrons in the discharge space 137.

Therefore, invisible light is generated in each discharge space 137 by the discharge voltage applying member 300.

On the other hand, a fluorescent layer is formed inside the light source body 100 to change the invisible light into visible light. The fluorescent layer converts invisible light, such as ultraviolet light into visible light.

Backlight assembly

6 is an exploded perspective view illustrating a backlight assembly according to an embodiment of the present invention. FIG. 7 is an enlarged view of a portion A of FIG. 6. In the present embodiment, since the surface light source device is the same as the embodiment of the surface light source device described above, duplicate description thereof will be omitted, and the same components and the same reference numerals will be given to the same components.

6 and 7, the backlight assembly 600 includes a surface light source device 400 and a storage container 500.

The surface light source device 400 has a rectangular parallelepiped shape, and has cutouts 400a, 400b, 400c, and 400d partially cut around a corner where two sides meet.

The storage container 500 includes a storage container body 510 and a storage container fixing part 520.

The container body 510 houses the surface light source device 400. In order to accommodate the surface light source device 400, the container body 510 includes a bottom surface 511 and a side wall 512.

The bottom surface 511 is in contact with the fourth surface 136 of the second substrate 120 of the surface light source device 400. In the present embodiment, the bottom surface 511 has a rectangular parallelepiped shape on which the surface light source device 400 is mounted.

The side wall 512 extends from the edges of the bottom surface 511 to face the four sides 131, 132, 133, 134 of the surface light source device 400, respectively. At this time, the side walls 512 may be connected to each other, may not be connected to each other. In the present embodiment, the side walls 512 are formed not to be connected to each other.

In a state where the surface light source device 400 is disposed on the storage container body 510, the storage container fixing part is formed at a portion corresponding to the cutouts 400a, 400b, 400c, and 400d formed around the edge of the surface light source device 400. 520 is formed.

The storage container fixing part 520 allows the storage container 500 to be fixed to a case (not shown).

The storage container fixing part 520 includes a first fixing part 521 and a second fixing part 522.

The first fixing part 521 is formed by cutting a portion of the bottom surface 511 of the storage container body 510 and then bending it in a vertical direction with respect to the bottom surface 511. In this case, the first fixing part 521 is in contact with the cutouts 400a, 400b, 400c, and 400d of the surface light source device 400.

The second fixing part 522 is formed by bending a part of the first fixing part 521. The second fixing part 522 is formed by bending in parallel with the bottom surface 511 from the first fixing part 521. At this time, the bending direction of the second fixing part 522 is a direction that does not overlap with the surface light source device 400. At this time, it is preferable that the end of the second fixing part 522 does not protrude to the outside of the side wall 512 of the storage container body 510.

The second fixing part 522 is provided with a hole 522a for screwing. In the present embodiment, preferably two holes 522a are formed side by side.

Therefore, the first fixing part 521 is coupled to the cutouts 400a, 400b, 400c, and 400d of the surface light source device 400 to prevent the left and right flow of the surface light source device 400, and the second fixing part Since the 522 may be fixed to the case without protruding to the outside of the sidewall 512 of the container body 510, it is possible to prevent an unnecessary increase in the volume of the backlight assembly.

Meanwhile, the storage container 500 may be made of metal to prevent deformation from occurring due to external shock and vibration, and the discharge voltage applying member of the surface light source device 400 accommodated in the storage container 500 may be Since a high voltage of several to several tens of [Hz] is applied to the 300, when the discharge voltage applying member 300 and the storage container 500 of the surface light source device 400 are shorted, fire or human life may be lost.

Therefore, in the present invention, an insulating layer (not shown) containing an insulating material is formed in a thin inside of the storage container 500, or an insulating layer including the insulating material in a portion where the high voltage is applied in the surface light source device 400. It is preferable to form it thinly.

As such, when the insulating layer is thickly formed in the interior of the storage container 500, the impact or vibration applied from the outside is prevented from being transferred directly from the storage container 500 to the surface light source device 400, thereby preventing the surface light source device 400. ), Etc., can be prevented.

Display

8 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention. FIG. 9 is an enlarged view illustrating part B of FIG. 8.

8 and 9, the display device 800 includes a surface light source device 400, a storage container 500, a case 700, and a display panel 740.

The surface light source device 400 has a rectangular parallelepiped shape, and has cutouts 400a, 400b, 400c, and 400d partially cut around a corner where two sides meet.

The storage container 500 includes a storage container body 510 and a storage container fixing part 520.

The container body 510 houses the surface light source device 400. In order to accommodate the surface light source device 400, the container body 510 includes a bottom surface 511 and a side wall 512.

The bottom surface 511 is in contact with the fourth surface 136 of the second substrate 130 of the surface light source device 400. In the present embodiment, the bottom surface 511 has a rectangular parallelepiped shape on which the second substrate 130 of the surface light source device 400 is seated.

The side wall 512 extends from the edges of the bottom surface 511 to face four sides of the surface light source device 400. At this time, the side walls 512 may be connected to each other, may not be connected to each other. In the present embodiment, the side walls 512 are formed not to be connected to each other.

In a state where the surface light source device 400 is disposed on the storage container body 510, the storage container fixing part is formed at a portion corresponding to the cutouts 400a, 400b, 400c, and 400d formed around the edge of the surface light source device 400. 520 is formed.

The storage container fixing part 520 allows the storage container 500 to be fixed to the case 700 or the like.

The storage container fixing part 520 includes a first fixing part 521 and a second fixing part 522.

The first fixing part 521 is formed by cutting a portion of the bottom surface 511 of the storage container body 510 and then bending it in a vertical direction with respect to the bottom surface 511. In this case, the first fixing part 521 is in contact with the cut-out portion of the surface light source device 400.

The second fixing part 522 is formed by bending the first fixing part 521. The second fixing part 522 is formed by bending in parallel with the bottom surface 511 from the first fixing part 521. At this time, the bending direction of the second fixing part 522 is a direction that does not overlap with the surface light source device 400. At this time, it is preferable that the end of the second fixing part 522 does not protrude to the outside of the side wall 512 of the storage container body 510.

The second fixing part 522 is provided with a hole 522a for screwing. In the present embodiment, preferably two holes 522a are formed side by side.

Meanwhile, the storage container 500 accommodating the surface light source device 400 is stored in the case 700 again. In this embodiment, the case 700 is composed of a front case 720 and a rear case 710. In this embodiment, the storage container 500 is coupled to the rear case 710.

The rear case 710 is composed of a case bottom surface 711 and a case side wall 712.

The case bottom surface 711 is in contact with the bottom surface 511 of the container body 510, and the case side wall 712 is formed to face the side wall 512 of the container body 510. Therefore, the storage container 500 is fixed at the position designated by the case bottom surface 711 and the case side wall 712.

In order to fasten the rear case 710 and the storage container 500 to each other, a fixing boss 711a is formed on the case bottom surface 711 of the rear case 710. In this case, the fixing boss 711a is formed at a position corresponding to the second fixing part 522 of the storage container fixing part 520 of the storage container 500.

In the present embodiment, the end of the high information 711a is seated on the storage container fixing part 520 of the storage container 500. At this time, it is preferable that the fixing boss 711a further includes a screw fastening hole for fastening the screw.

In the state where the second fixing part 522 is seated on the high information 711a, the hole 522a formed in the high information 711a and the second fixing part 522 is fastened by the fastening screw 523 to receive the storage container. 500 is firmly fixed to the rear case 710.

At this time, since the second fixing part 522 does not protrude from the side wall 512 of the storage container 500, the side fixing part 522 is disposed between the side wall 512 of the storage container 500 and the case side wall 712 of the rear case 710. Since no empty space is formed, the volume and weight of the display device can be greatly reduced.

The diffusion member 730 may be further disposed in the surface light source device 400 accommodated in the storage container 500 fixed to the rear case 710. The diffusion member 730 further diffuses the light generated by the surface light source device 400 to further improve the luminance uniformity of the light generated by the surface light source device 400. At this time, the diffusion member 730 is fixed via the storage container 500.

The display panel 740 is disposed on the top surface of the diffusion member 730. The display panel 740 changes the light generated by the surface light source device 400 into image light including information. To implement this, the display panel 740 may include a TFT substrate 741, a color filter substrate 743, and a liquid crystal 742. The display panel 740 is fixed through the storage container 500.

On the other hand, the horizontal movement of the display panel 740, the diffusion member 730, and the surface light source device 400 is limited by the storage container 500, but since the vertical movement is not limited, they are external to the storage container 500. May be displaced.

To prevent this, the display panel 740 is fixed by the top chassis 750. The top chassis 750 is hooked to the side surface of the storage container 500 while pressing the edge of the display panel 740. The vertical movement of the display panel 740, the diffusion member 730, and the surface light source device 400 is limited by the top chassis 750.

Meanwhile, the front case 720 is coupled to the case sidewall 712 of the rear case 710. The front case 720 surrounds the top chassis 750 holding down the edge of the display panel 740 and is fixed to the case sidewall 712 of the rear case 710.

As described in detail above, the weight and volume of the backlight assembly and the display device are greatly reduced by changing the structure of the surface light source device mounted on the display device, thereby improving the quality of the display device.

In the detailed description of the present invention described above with reference to a preferred embodiment of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the invention described in the claims to be described later It will be understood that various modifications and variations can be made in the present invention without departing from the scope of the present invention.

1 is an exploded perspective view of a surface light source device according to an embodiment of the present invention.

FIG. 2 is a plan view illustrating the first substrate of FIG. 1.

3 is a plan view illustrating a second substrate of FIG. 1.

4 is a plan view of the sealing member illustrated in FIG. 1.

FIG. 5 is a perspective view illustrating a combination of the surface light source device shown in FIG. 1.

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

FIG. 7 is an enlarged view of a portion A of FIG. 6.

8 is an exploded perspective view of a display device according to an exemplary embodiment of the present invention.

FIG. 9 is an enlarged view illustrating part B of FIG. 8.

Claims (12)

A first substrate having an incision around an edge formed by two adjacent sides, a second substrate having a shape corresponding to the shape of the first substrate, and interposed between edges of the first and second substrates; A light source body including a sealing member forming a sealed space between two substrates; A space dividing member interposed between the first and second substrates to divide the space into a plurality; And And a discharge voltage applying member for generating a discharge in each discharge space to generate light. The surface light source device of claim 1, wherein each of the first and second substrates has a rectangular plate shape and the corners have four corners. The surface light source device of claim 1, wherein the sealing member is disposed along edges of the first and second substrates. The surface light source device of claim 1, wherein the discharge voltage applying member is disposed on an outer surface of the body, and the discharge voltage applying member and the space dividing member are disposed substantially vertically. The method of claim 1, wherein the body further comprises a discharge gas for generating invisible light by the discharge and a fluorescent layer formed on the inner surface in contact with the discharge space to change the invisible light into visible light Surface light source device, characterized in that. A surface light source device having an incision formed around a corner formed by two sides having a rectangular parallelepiped shape; And A bottom surface in contact with the surface light source device, a storage container body including sidewalls extending from the bottom surface to surround the side surfaces of the surface light source device, and extending in a direction perpendicular to the bottom surface to surround the cutout from the body; And a storage container including a storage container fixing part having a first fixing part and a second fixing part extending in a direction parallel to the bottom surface from the first fixing part. The backlight assembly of claim 6, wherein a screw fastening hole is formed in the second fixing part. A surface light source device having a cutout formed by cutting a periphery of a corner formed by meeting two side surfaces in a plate shape; A bottom surface in contact with the surface light source device, a body including sidewalls extending from the bottom surface to surround the side surfaces of the surface light source device, and a body extending in a direction perpendicular to the bottom surface to surround the incision from the body; A storage container including a first fixing part and a fixing part having a second fixing part extending in a direction parallel to the bottom surface from the first fixing part; A case accommodating the first accommodating container and formed at a position of the second fixing part and including a high information for fastening the second fixing part with a screw; And And a display panel for converting the light into image light including information. The display device of claim 1, wherein the second fixing part further comprises a hole. The display device of claim 10, wherein the high information further comprises a screw fastening hole formed corresponding to the position of the hole. The display device according to claim 8, wherein a diffusion member for diffusing the light is interposed between the surface light source device and the display panel. The display apparatus of claim 8, wherein a top chassis fixing an edge of the display panel is coupled to the storage container to prevent movement of the display panel.