KR101841572B1 - Curved display apparatus for slim type - Google Patents

Abstract

The present invention relates to a curved display device which is advantageous for a display device having a free curved shape and can be realized with a thin thickness by applying a mold frame. According to the present invention, the curved display device includes: a plate-shaped back cover having a curved shape to support the display device; a light source disposed at a front edge of the back cover to provide light to the inside; an optical member disposed on a front surface of the back cover to convert light incident from the light source into surface light to provide the surface light to the front surface; a mold frame disposed along a front edge of the back cover where the light source is not disposed while fixing the optical member and being screwed to the back cover; a guide panel having a frame shape corresponding to an edge of the back cover and screwed to the mold frame at a front surface of the mold frame; and a liquid crystal panel coupled to the front surface of the guide panel. The back cover and the mold frame are coupled to each other by a rear screw fastening portion including a screw passing through the back cover and the mold frame from a rear surface of the back cover. The guide panel and the mold frame are coupled to each other by a front screw fastening portion including a screw passing through the guide panel and the mold frame from a front surface of the guide panel.

Description

[0001] Curved display apparatus for slim type [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a curved display device which is advantageous for a display device having a free-form surface while implementing a thin thickness by applying a mold frame.

2. Description of the Related Art Display devices are widely used in devices such as TVs, smart phones, notebooks, and tablets. They are widely used in liquid crystal displays (LCDs), organic light-emitting displays (OLEDs) Plasma Display Panel) have been used.

Unlike other display devices, a liquid crystal display (hereinafter, referred to as 'LCD') can not emit light by itself, and an external light source is necessarily required to realize an image. Therefore, the LCD further includes a backlight unit as a light source in addition to the liquid crystal panel, and the backlight unit uniformly supplies the surface light source of high luminance to the liquid crystal panel, thereby realizing a high-quality image.

In recent years, when installed in a wide open space such as an indoor or outdoor open space, a curved display device capable of paying attention to a wide range of people's eyes and capable of recognizing images of a display device without distorting the screen according to directions Is presented. For example, Japanese Laid-Open Patent Publication No. 10-2014-0060078 (Prior Art 1) discloses a technique for implementing a curved surface display device of a side dimming type, and Korean Patent Laid-Open No. 10-2014-0036461 (Prior Art 2) Discloses a technique for implementing a curved surface display device of the type shown in FIG.

FIG. 1 and FIG. 2 are exploded perspective views schematically showing a curved surface display device of a side light modulation type according to a related art and an enlarged schematic cross-sectional view of a main part. As shown in these drawings, the curved display device according to the conventional technique has a certain curvature in the bottom chassis 11 to provide a curved surface to the overall display device. The rectangular panel-shaped guide panel 14 is fastened to the bottom chassis 11 while pressing the light guide plate 12 from the upper side of the light guide plate 12 so that the double- The liquid crystal panel 16 is coupled to the liquid crystal panel 16. Further, an LED array 13, which is a light source, is disposed on the side of the light guide plate 12.

Here, the light guide plate 12 and the guide panel 14 have a predetermined rigidity and a flexible material, and have a curvature while being coupled with the bottom chassis 11 in a state of no curvature. That is, in the conventional curved display device, the bottom chassis 11 holds the curved surface of the display device, and the light guide plate 12 and the guide panel 14 are coupled to the bottom chassis 11 to form a curvature. Further, the guide panel 14 is fastened and fixed to the bottom chassis 11 with a hook structure, and the curvature is maintained.

Since the curved display device having the above-described structure is assembled with the guide panel after the light guide plate is first assembled to the bottom chassis having a constant curvature, the assembling structure for fixing the light guide plate to the bottom chassis is complicated and the assembling process becomes complicated have.

In addition, the curved surface display device has a problem in that curvature is given to each of the components by the bottom chassis, and the curved shape is deformed for a long period of use. That is, the guide panel and the bottom chassis are fastened to each other with a hook structure, so that the assembling property of the product is not stable, so that the fastening due to long-term use can be loosened and the curved shape can be deformed. Particularly, the hook fastening structure between the guide panel and the bottom chassis does not show a firm fastening force, so that it is difficult to realize a curved surface display device of a free curved shape having concave portions and convex portions at the same time.

In addition, the curved surface display device has a hook-shaped fastening structure formed on the sides of the bottom chassis 11 and the guide panel 14 so that the sides of the bottom chassis and the guide panel have a minimum width for processing the hook structure Thickness), which is a limit to the slimming of the display device.

2, the back cover 21 and the front cover 22 are separately joined to each other to cover the bottom chassis 11 from outside and stably connect the respective components. Therefore, in the conventional curved display device, a process of assembling the curved display module and then assembling the back cover and the front cover separately is added, which complicates the process. Also, the number of parts to be assembled increases, .

Korean Patent Laid-Open Publication No. 10-2014-0060078 (filed on May 19, 2019, Korean Patent Publication No. 10-2014-0036461 (filed on March 26, 2014, curved display device)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a curved display device having a structure that minimizes component parts, simplifies the assembling process, and reduces manufacturing costs.

It is another object of the present invention to provide a curved surface display device capable of preventing deformation of a curved shape with excellent assembling robustness and particularly capable of stably maintaining a curved shape even in a display device of a free curved surface shape having concave portions and convex portions at the same time The purpose.

Another object of the present invention is to provide a curved display device having concave portions and convex portions at the same time.

Still another object of the present invention is to provide a slim display device similar to an organic light emitting panel while using a liquid crystal panel.

The above object is also achieved by a curved surface display device of the present invention comprising: a plate-shaped back cover for supporting a display device in a curved shape; A light source disposed at a front edge of the back cover to provide light to the inside; An optical member disposed on a front surface of the back cover to convert light incident from the light source into a surface light source to provide the light to the front surface; A mold frame which is disposed along a front edge of the back cover where the light source is not disposed while fixing the optical member and is screwed to the back cover; A guide panel having a frame shape corresponding to an edge of the back cover and screwed to the mold frame at the front surface of the mold frame; And a liquid crystal panel coupled to a front surface of the guide panel, wherein the back cover and the mold frame are fastened by a rear screw fastening portion passing through the back cover and the mold frame from a back surface of the back cover, Wherein the guide panel and the mold frame are configured such that the screw is passed through the guide panel and the mold frame from the front surface of the guide panel and is fastened by the front screw fastening portion.

The curved display device of the present invention has the effect of simplifying the structure and assembling process and reducing the manufacturing cost by fastening the guide panel and the back cover on the front surface and the back surface through the mold frame.

Further, since the guide panel and the back cover are fastened to each other on the front surface and the back surface through the mold frame, the robustness of assembly is improved and the curved surface shape is stably maintained.

In addition, since the guide panel and the back cover form the appearance of the apparatus, the present invention minimizes the number of parts and thus exhibits an advantageous effect for slimming down.

Further, the present invention can be effectively applied to a free-curved surface display device having a concave portion and a convex portion at the same time due to a strong assembling nature of the guide panel and the back cover.

In addition, the present invention can significantly reduce manufacturing cost compared to OLED devices by implementing a slim type display device having a thickness similar to that of a display device using an organic light emitting panel while applying a liquid crystal panel.

1 is an exploded perspective view showing a main structure of a side-illuminated curved display device according to a conventional technique,
FIG. 2 is an enlarged schematic cross-sectional view of a main part of the curved display device of FIG. 1,
3 is an exploded perspective view of a curved display device according to an embodiment of the present invention,
4 is a rear perspective view of a curved display device according to an embodiment of the present invention,
FIG. 5 is an enlarged sectional view showing the fastening structure of the back cover and the mold frame,
6 is a front perspective view showing a curved display device according to an embodiment of the present invention,
FIG. 7 is an enlarged sectional view showing the fastening structure of the guide panel and the mold frame,
8 is an enlarged perspective view showing an optical sheet fixing structure according to an embodiment of the present invention, and Fig.
9 is a cross-sectional view showing an optical sheet fixing structure according to an embodiment of the present invention.

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

3 is an exploded perspective view showing a curved display device according to an embodiment of the present invention.

3, the curved display device of the present invention includes a rectangular back cover 100, an LED array 200 disposed on one side edge of the back cover, A mold frame 400 disposed along the edge of the optical member at the front of the back cover, a guide panel 500 disposed along the front edge of the optical member, And a liquid crystal panel 600. A control board for driving the display device may be coupled to the back surface of the back cover 100, and a shield cover is coupled to protect the driving board.

Specifically, the back cover 100 is a back cover of the curved display device, which stably fastens the components, enhances the strength of the curved display device, and performs a heat radiation function. In particular, the back cover 100 is a main support member for allowing the display device to maintain the curved shape, and has sufficient rigidity to stably support the display device. The back cover 100 of the present invention is an advanced composite material which is thin and light and can exhibit excellent rigidity. The back cover 100 is made of an aluminum composite material in which aluminum and resin are combined. The back cover 100 using the aluminum resin composite material can stably support the display module even with a small thickness, which is easy to lighten and slim down the display device, and has an advantage of easy processing for a curved surface shape. Further, the back cover 100 may be made of a metal sheet material or a plastic injection material as long as it exhibits excellent rigidity.

The back cover 100 may further include a reinforcing frame 510 that is fastened to the back surface so as to reinforce the rigidity and to maintain the curved shape stably. The reinforcing frame 110 is made of a thin steel sheet material and is fastened in the curved surface direction (x direction) to prevent curvature deformation of the back cover 100 due to elastic deformation.

The LED array 200 is a light source of a display device and is mounted along a substrate in which a plurality of LED packages form a curved curved surface. The LED array 200 is mounted on a back cover (not shown) through an LED housing 210 at an opened position of the mold frame 400 100, respectively. The LED housing 210 is made of a thin steel sheet material having excellent thermal conductivity and emits heat generated in the LED array 200. In addition, the LED housing 210 has a curved surface shape along the curved surface direction (x direction) of the back cover 100 to reinforce the curved surface structure of the back cover 100.

The optical member 300 includes a reflective sheet 310, a light guide plate 320, and an optical sheet 330, and is configured to receive a light from the LED array 200 to generate a uniform surface light source. 100, respectively. The reflective sheet 310 is disposed between the light guide plate 320 and the back cover 100 to reflect the light leaking to the back surface of the light guide plate 320 to the front surface and the light guide plate 320 is disposed between the light guide plate 320 and the back cover 100, And the optical sheet 330 controls the direction of light emitted from the light guide plate 320 to improve brightness and uniformity. The optical member 300 is composed of a sheet or a film having a square planar shape and is fastened and fixed to the back cover 100, the mold frame 400 and the guide panel 500, do.

The mold frame 400 is composed of a frame having a shape of 'c' arranged along the edge of the back cover 100 except the position where the LED array 200 is disposed do. The mold frame 400 includes a reflective sheet 310, a light guide plate 320, and an optical sheet 330 disposed inside the back cover 100 and the guide panel 500, And align them so that they can be fixed at a predetermined position. A plurality of screw fastening portions for fastening the guide panel 500 and the back cover 100 are formed on the front surface and the rear surface of the mold frame 400, respectively.

The mold frame 400 has a curved surface shape having a curvature equal to that of the back cover 100 along one side of the curved surface direction (x direction) of the back cover 100, ). The mold frame 400 may be made of plastic or metal, and may be manufactured by injection molding, Al extrusion molding, or Al die casting.

The guide panel 500 is fixed to the mold frame 400 at the front surface of the optical member 300 and fixes the optical member 300 to the back surface and the liquid crystal panel 600 at the front surface. The guide panel 500 has a rectangular frame shape having an opening in the window area at the center, and the frame in the curved surface direction (x direction) has a curved surface with the same curvature as the back cover 100. The guide panel 500 is formed of a thin steel sheet material made of stainless steel (STS) or zinc-coated steel sheet (SECC).

The liquid crystal panel 600 is an element for displaying an image by the control signal of the driving substrate and the light provided by the optical member 300 and is coupled to the guide panel 500 through a double-sided adhesive foam pad 610 . At this time, the liquid crystal panel 600 is composed of a flexible panel, and the curved surface of the same curvature as that of the guide panel is maintained while being coupled along the seating surface of the guide panel 500 to provide a curved image panel.

The curved display device of the present invention may have a concave curved surface display device having a predetermined curvature by the back cover 100, the mold frame 400 and the guide panel 500, It is possible to realize a display device having a free curved surface shape having the portion 600a and the convex portion 600b at the same time. As described above, the free-form surface display device can provide an image having a three-dimensional effect while minimizing the distortion of the screen. At this time, in order to maintain the concave curved surface or the free curved surface shape, the back cover 100 and the guide panel 500 must be tightly fastened. In the present invention, the guide panel 500 and the back cover 100 are screwed on the front surface and the back surface, respectively, so that the curved surface shape can be stably maintained.

FIG. 4 is a rear perspective view of a curved display device according to an embodiment of the present invention, FIG. 5 is an enlarged cross-sectional view of the fastening structure of a back cover and a mold frame, FIG. 7 is an enlarged cross-sectional view of the guide panel and the mold frame in the CC direction showing the main part of FIG. 6. FIG.

4 and 5, the back cover 100 has a rectangular plate-like plate shape, and the edges of the back cover 100 and the mold frame 400 are assembled by the screws 700 A plurality of rear screw fastening portions 710 are formed. The backside screw fastening part 710 may include a fastening hole 711 formed in the back cover 100 and a fastening hole 712 and a screw hole 713 formed in the mold frame 400.

A plurality of the coupling grooves 711 are formed at predetermined intervals along the edge of the back cover 100 and are recessed to a predetermined depth so as not to protrude from the back surface of the back cover 100. A fastening hole 712 for inserting the screw body is formed in the fastening groove 711 through the back cover. A plurality of screw holes 713 may be formed at positions corresponding to the fastening holes 712 in the longitudinal direction of the mold frame 400. The screw holes 713 may be formed as grooves or concave grooves through the mold frame 400, The hole 713 may further include an insert nut 714 for reinforcing the screw fastening.

The back cover 100 is assembled to the mold frame 400 by fastening the screw 700 to the rear screw fastening portion 710 having the above-described structure. At this time, the back cover 100 is assembled while the edge of the back cover 100 is closely attached to the back surface of the mold frame 400 by the screw 700.

6 and 7, the guide panel 500 has a rectangular frame shape and includes a horizontal fastening piece 510 fastened to the mold frame 400, And a supporting piece 530 extending inward in the horizontal direction while forming a lower step at an inner end of the fastening piece. Here, the fastening piece 510 constitutes a bezel area of the display device while providing an area for fastening the guide panel 500 to the mold frame 400. The cover piece 520 is bent in the vertical direction in the clamping piece 510 to close the side of the mold frame 400 to prevent light emitted from the light source member 300 from leaking to the outside. The supporting piece 530 has a lower step than the clamping piece 510 and the front surface provides a seating surface 531 on which the liquid crystal panel 600 is seated and the back surface of the supporting piece 530 presses and fixes the optical member 300 Thereby providing a pressing surface 532.

A plurality of front screw fastening portions 720 are formed on the guide panel 500 and the mold frame 400 in order to assemble them with the screws 700. The front screw fastening portion 720 includes a fastening groove 721 formed in the guide panel 500 and fastening holes 722 and a screw hole 723 formed in the mold frame 400.

A plurality of fastening grooves 721 are formed at predetermined intervals along the longitudinal direction of the fastening pieces 510. The screw heads are recessed to a predetermined depth so as not to protrude to the front surface of the fastening pieces 510. A fastening hole 722 for inserting the screw body is formed in the fastening groove 721 through a part of the fastening piece 510. The screw holes 723 may be formed in a plurality of positions at positions corresponding to the fastening holes 722 in the longitudinal direction of the mold frame 400 and may be formed as grooves through the mold frame 400 or concave grooves in the front surface thereof. And the screw hole 723 may be further provided with an insert nut 724 for reinforcing the screw tightening.

The guide 700 is assembled to the mold frame 400 by fastening the screw 700 to the front screw fastening portion 720 having the above-described structure. That is, the guide panel 500 is configured such that the clamping piece 510 is brought into close contact with the entire surface of the mold frame 400 so that the cover piece 520 closes the side of the mold frame 400, The guide panel 500 and the mold frame 400 are assembled with each other through the screw hole 723 and the screw hole 723.

As described above, the back cover 100 and the guide panel 500 are fastened to the mold frame 400, respectively, and can be easily assembled. Even when the back cover 100 and the guide panel 500 are used for a long time by screw fastening, the fastening force is not weakened, . Particularly, the assembled structure using the mold frame 400 and the screw 700 as described above can stably maintain the curved shape in a free-curved display device having concave portions and convex portions at the same time.

The back cover 100 and the guide panel 500 are fastened to each other in the back and front direction opposite to each other through the central mold frame 400 so that the gap between the back cover 100 and the guide panel 500 In other words, it is possible to realize a slim type display device such as a display device using an organic light emitting panel as a video panel while using it as a liquid crystal panel image panel, which is advantageous for slimming down a display device. At this time, it is preferable that the rear screw fastening portion 710 and the front screw fastening portion 720 are formed in a zigzag shape at mutually offset positions.

FIG. 8 is an enlarged perspective view illustrating an optical sheet fixing structure according to an embodiment of the present invention, and FIG. 9 is a cross-sectional view illustrating an optical sheet fixing structure according to an embodiment of the present invention, and FIG.

Generally, the display device requires a separate structure for fixing the optical sheet disposed inside the back cover. In the curved display device of the present invention, a structure for fixing the optical sheet 330 is formed in the mold frame 400.

A wing portion 331 for fixing the optical sheet 330 to the mold frame 400 is formed at an edge of the optical sheet 330. The wings 331 protrude outward from the edge of the optical sheet 330 and are formed at a predetermined interval along the edges. A locking hole 332 is formed in the wing portion 331 of the optical sheet 330. A seating groove 411 in which the wing 331 is seated is formed at a front surface of the mold frame 400 at a position corresponding to the wing portion 331 of the optical sheet 330 and recessed to a predetermined depth. A locking protrusion 412 inserted into the locking hole 332 of the optical sheet 330 is protruded from the seating groove 411.

The optical sheet 330 is fastened to the mold frame 400 so that the latching protrusion 412 of the mold frame 400 is inserted into the latching hole 332, The optical sheet 330 is prevented from flowing and is stably fixed.

In the conventional display device, the structure for fixing the optical sheet is formed on the guide panel or the bottom chassis, and since the guide panel or the bottom chassis needs to have a predetermined thickness for processing the fixing structure, . However, in the display device of the present invention, the optical sheet fixing structure is formed on the front surface of the mold frame, so that the display device can be further slimmed.

Further, in the case where the optical sheet fixing structure is formed on the guide panel or the bottom chassis as in the prior art, a separate component such as a front cover or a back cover must be additionally coupled to cover the fixing structure. However, the display device of the present invention does not require a separate component for covering the fixing structure because the fixing structure formed on the mold frame is covered by the guide panel.

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 cover 110: reinforcing frame
200: LED array 210: LED housing
300: optical member 310: reflective sheet
320: light guide plate 330: optical sheet
400: Mold frame
500: guide panel 510: fastener
520: cover piece 530:
600: liquid crystal panel 610: foam pad
700: Screw
710, 720:
711, 721: fastening groove
712, 722: fastening hole
713,723: Screw hole
714,724: Insert nut

Claims (7)

Like back cover that supports a display device while forming a curved shape;
A light source disposed at a front edge of the back cover to provide light to the inside;
An optical member disposed on a front surface of the back cover to convert light incident from the light source into a surface light source to provide the light to the front surface;
A mold frame which is disposed along a front edge of the back cover where the light source is not disposed while fixing the optical member and is screwed to the back cover;
A guide panel having a frame shape corresponding to an edge of the back cover and screwed to the mold frame at the front surface of the mold frame; And
And a liquid crystal panel coupled to the front surface of the guide panel,
Wherein the back cover and the mold frame are fastened by a rear screw fastening portion through which the screw passes from the back surface of the back cover to the back cover and the mold frame,
Wherein the guide panel and the mold frame are configured such that a screw is passed through the guide panel and the mold frame from the front surface of the guide panel and is fastened by a front screw fastening portion. The method according to claim 1,
Wherein the rear surface screw fastening portion and the front screw fastening portion are applied to a rear surface of the back cover and a front surface of the guide panel which are offset from each other in a zigzag fashion. The apparatus according to claim 1,
A fastening piece which is brought into close contact with the front surface of the mold frame;
A cover piece extending from the outer end of the fastening member to the back surface to seal the side of the device; And
And a supporting piece extending to the inside of the fastening member while forming a lower step than the fastening piece, the back surface pressing the edge of the optical member and the front surface placing the liquid crystal panel. [5] The apparatus of claim 3,
And a screw is fastened to the mold frame at a fastening piece of the guide panel. 5. The method of claim 4,
Wherein the rear screw fastening portion and the front screw fastening portion are formed in a substantially rectangular shape,
And a screw is fastened to the mold frame in a coupling groove formed by recessing the coupling piece and the edge of the back cover, respectively. The back cover according to any one of claims 1 to 3,
Wherein the curved surface has a concave curved surface and a convex curved surface at the same time. 4. The method according to any one of claims 1 to 3,
Wherein the mold frame is formed with a seating groove in which the wing portion of the optical sheet is seated, and a locking protrusion is formed in the seating groove to be inserted into the locking hole of the wing portion,
Wherein the optical sheet is fastened to the mold frame so that the locking protrusion is inserted into the locking hole.

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