Patent Publication Number: US-2019187512-A1

Title: Display unit and display apparatus having the same

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a National Phase application, under 35 U.S.C. § 371, of international application No. PCT/KR2017/009086 filed Aug. 21, 2017, which claims Convention Priority to Korean patent application No. 10-2016-0113338 filed Sep. 2, 2016, the entire disclosures of which are herein incorporated by reference as a part of this application. 
    
    
     FIELD 
     The present disclosure relates to a display apparatus including a bottom chassis used as a support panel for supporting internal components. 
     DESCRIPTION OF RELATED ART 
     A display apparatus is an apparatus that receives an image signal and displays an image on a screen. An example of the display apparatus is a television, a monitor, and the like. 
     The display apparatus includes a display panel for displaying an image, a backlight for supplying light to the display panel, and various printed circuit boards for operating the display panel. 
     In addition, the display apparatus includes a bottom chassis, which is a support panel for supporting the backlight or the printed circuit boards. 
     In recent years, the size and weight of the display panel, the backlight and the printed circuit boards have been increasing due to the trend toward larger display apparatuses, and thus it is necessary to increase the strength and rigidity of the bottom chassis, which is a support panel for supporting the display panel, the backlight and the printed circuit boards. 
     SUMMARY 
     It is an aspect of the present disclosure to provide a display apparatus capable of increasing the strength and rigidity of a bottom chassis while keeping the bottom chassis, which is a support panel for supporting components disposed inside of the display apparatus, at a predetermined thickness or less. 
     In accordance with an aspect of the present disclosure, a display comprises a bottom chassis to support components inside the display, the bottom chassis includes a rear portion that is of a rectangular shape plate and side portions extending forward from outer side ends of the rear portion toward a front of the display, a reinforcing pattern array formed by a plurality of reinforcing patterns on the rear portion, and the plurality of reinforcing patterns are provided by forming a plurality of embossing portions which are raised from the bottom chassis and then pressing each of the plurality of embossing portions. 
     The reinforcing patterns may be each formed in a hexagon shape, and may be arranged side by side adjacent to each other. 
     The bottom chassis may include depressed portions formed to be recessed into the rear portion and divide the bottom chassis into a plurality of spaces. 
     The reinforcing patterns may be formed on both inside and outside of the depressed portions. 
     The reinforcing patterns may be formed only outside an area of the depressed portions. 
     The display may further comprise a display panel, and a backlight to supply light to the display panel, wherein the bottom chassis may support the backlight. 
     The backlight may include a light guide plate disposed at a rear side of the display panel, a substrate disposed at a rear side of the display panel, and a plurality of light emitting diodes disposed on the substrate, and the bottom chassis may support the light guide plate and the substrate. 
     The display may further comprise a display panel made of an organic light emitting diode panel, wherein the bottom chassis may support the display panel. 
     In accordance with another aspect of the present disclosure, a display apparatus comprises: a display panel; a support plate disposed on a rear side of the display panel and formed of a metal material to receive heat generated from the display panel; and a printed circuit board disposed on the rear of the support plate to supply an electrical signal to the display panel, wherein the support plate includes a reinforcing pattern array formed by a plurality of reinforcing patterns, and the plurality of reinforcing patterns are provided by forming a plurality of embossing portions which are raised from the support plate and then pressing each of the plurality of embossing portions. 
     As described above, the display apparatus according to the present disclosure can provide a bottom chassis having a predetermined thickness or less while having increased rigidity and strength by forming a reinforcing pattern array on the bottom chassis. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view of a display apparatus according to an embodiment of the present disclosure. 
         FIG. 2  is an exploded perspective view of a display apparatus according an embodiment of the present disclosure. 
         FIG. 3  is a perspective view of a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 4  is a cross-sectional view illustrating a process of forming embossing portions on a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 5  is a cross-sectional view illustrating a process of pressing embossing portions of a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 6  is a perspective view of a light source and a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 7  is a perspective view of a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 8  is a perspective view of a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 9  is an exploded perspective view of a display panel and a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
         FIG. 10  is an exploded perspective view of a backlight and a bottom chassis applied to a display apparatus according to an embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The embodiments described herein and the configurations shown in the drawings are only examples of preferred embodiments of the present disclosure, and various modifications may be made at the time of filing of the present disclosure to replace the embodiments and drawings of the present specification. 
     Like reference numbers or signs in the various figures of the present application represent parts or components that perform substantially the same functions. 
     The terms used herein are for the purpose of describing the embodiments and are not intended to restrict and/or to limit the present disclosure. For example, the singular expressions herein may include plural expressions, unless the context clearly dictates otherwise. The terms “comprises” and “has” are intended to indicate that there are features, numbers, steps, operations, elements, parts, or combinations thereof described in the specification, and do not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, parts, or combinations thereof. 
     It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are only used to distinguish one component from another. For example, without departing from the scope of the present disclosure, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term “and/or” includes any combination of a plurality of related items or any one of a plurality of related items. 
     In this specification, the terms “front,” “rear,” “upper,” “lower,” “left,” and “right” are defined with reference to the drawings, and the shape and position of each component are not limited by these terms. 
     Hereinafter, a display apparatus according to a first embodiment of the present disclosure will be described in detail with reference to the drawings. 
     As illustrated in  FIG. 1 , a display apparatus according to a first embodiment of the present disclosure includes a display unit (a display)  10  for displaying an image, and a stand  20  for supporting the display unit  10  so that the display unit may be used in a standing state. 
     As illustrated in  FIG. 2 , the display unit  10  includes a display panel  11  on which an image is displayed, backlights  12  and  13  for supplying light to the display panel  11 , and optical sheets  14  including  14 A and  14 B disposed between the display panel  11  and the backlights  12  and  13  to improve the optical characteristics of light supplied from the backlights  12  and  13 . 
     The display unit  10  also includes a middle frame  15  for supporting the display panel  11 , a top chassis  16  provided at a front side of the middle frame  15  to maintain a state in which the display panel  11  is supported by the middle frame  15 , a bottom chassis  17  provided at a rear side of the middle frame  15  to accommodate the backlights  12  and  13 , and a case  18  which covers a rear surface of the bottom chassis  17  and forms a rear surface of the display unit  10 . 
     In addition, although not shown in the drawings, various printed circuit boards for driving the display unit  10  are mounted on the rear surface of the bottom chassis  17 , and the case  18  serves to cover these printed circuit boards. The printed circuit boards include a power board for power supply, a panel drive board for transmitting power to the display panel  11 , a timing control board for transmitting an image signal to the display panel  11 , a signal processing board for processing image signals and sound signals, and the like. 
     The display panel  11  is formed of a liquid crystal panel and receives light from the backlights  12  and  13  to display an image. 
     The backlights  12  and  13  include the light guide plate  13  formed in a rectangular flat plate shape so as to correspond to the display panel  11 , and a pair of the light sources  12  arranged so as to correspond to opposite side surfaces of the light guide plate  13  to irradiate light toward the opposite side surfaces of the light guide plate  13 . 
     The light guide plate  13  is made of a transparent resin material so as to guide light, and a white reflective sheet  13   a  for reflecting light disposed on a rear surface of the light guide plate  13 . Accordingly, the light emitted from the light source  12  is incident on the inner side of the light guide plate  13  through the opposite side surfaces of the light guide plate  13  and is reflected by the reflective sheet  13   a , and then exits through a front surface of the light guide plate  13 . 
     Each of the light sources  12  includes a plurality of light emitting diodes  12   a , and a rectangular bar-shaped substrate  12   b  in which the light emitting diodes  12   a  are arranged in a row. The substrates  12   b  are vertically arranged to correspond to the opposite side surfaces of the light guide plate  13 , and the light emitting diodes  12   a  are vertically disposed on the substrate  12   b  so as to face one surface of the light guide plate  13 . 
     The optical sheets  14  which includes the dual brightness enhancement film (DBEF) sheet  14 A which is a high-brightness prism sheet, and the diffuser sheet  14 B for diffusing incident light. 
     The middle frame  15  is formed in a substantially rectangular ring shape to support outer sides of the rear surface of the display panel  11 . 
     The top chassis  16  is formed in a substantially rectangular ring shape and is coupled to a front side of the middle frame  15  to support front outer sides of the display panel  11 , so that the display panel  11  is maintained in a state of being mounted on the middle frame  15 . 
     The bottom chassis  17  is formed of a metal material so that heat generated from the light sources  12 ,  13 , the printed circuit boards, and the like may easily be dissipated. As illustrated in  FIG. 3 , the bottom chassis  17  includes a rear portion  17   a  formed in a substantially rectangular plate shape, and side portions  17   b  extending forward from the four ends of the rear portion  17   a  to be coupled to the middle frame  15 . The bottom chassis  17  is formed to have a predetermined strength or higher and function as a support plate for supporting the backlights  12  and  13 . Since the bottom chassis  17  is formed of a metal material as described above, the bottom chassis  17  receives heat generated from the display panel  11 , the backlights  12  and  13 , or the printed circuit boards to diffuse through a surface thereof, and thus the bottom chassis  17  also serves as a heat radiating plate that allows heat to be radiated into the air more quickly. 
     The bottom chassis  17  further includes a reinforcing pattern array formed by a plurality of reinforcing patterns  17   c  that are provided in the rear portion  17   a  of the bottom chassis  17  to increase the strength and rigidity of the bottom chassis  17 , and depressed portions  17   d  formed by recessing the rear portion  17   a  of the bottom chassis  17  rearward. 
     The reinforcing patterns  17   c  are formed such that an outer line thereof has a relatively high density as compared with an inner portion thereof, thereby enhancing the strength and rigidity of the bottom chassis  17 . In the present embodiment, the reinforcing patterns  17   c  are each formed in a regular hexagonal shape and are arranged side by side vertically and horizontally. 
     The reinforcing pattern array is formed by a first press mold  30  illustrated in  FIG. 4  and a second press mold  40  illustrated in  FIG. 5 . 
     The first press mold  30  is composed of a first lower mold  31  on which a plate to be processed is placed on an upper surface thereof, and a first upper mold  32  provided so as to be movable vertically above the first lower mold  31 . 
     The first lower mold  31  includes protrusions  31   a  provided on the upper surface thereof, and the first upper mold  32  includes grooves  32   a  formed at positions corresponding to the protrusions  31   a , on a lower surface of the first upper mold  32 . 
     Accordingly, a plurality of embossing portions (e) are formed by placing the bottom chassis  17  on the first lower mold  31  and moving the first upper mold  32  downward to press the bottom chassis  17 , and an embossing array is formed by the plurality of embossing portions (e). 
     The plurality of reinforcing patterns  17   c  are formed by pressing the embossing portions (e) formed on the bottom chassis  17  through the second press mold  40  as illustrated in  FIG. 5 , respectively, and the reinforcing pattern array is formed by the plurality of reinforcing patterns  17   c.    
     The second press mold  40  is composed of a second lower mold  41  on which the bottom chassis  17  formed with the embossing portions (e) is placed on an upper surface thereof, and a second upper mold  42  provided so as to be movable vertically above the second lower mold  41 . In this case, the upper surface of the second lower mold  41  and a lower surface of the second upper mold  42  are formed as flat surfaces so as to be able to deform the embossing portions (e) flatly. 
     When the embossing portions (e) are deformed flatly by pressing the respective embossing portions (e) through the second press mold  40  as described above, the plurality of reinforcing patterns  17   c  are formed on the bottom chassis  17 , and the plurality of reinforcing patterns  17   c  form the reinforcing pattern array. Thus, the strength and rigidity of the bottom chassis  17  are increased by the reinforcing pattern array. 
     More specifically, when the embossing portions (e) are formed on the bottom chassis  17  through the first press mold  30 , the thickness of the portion where the embossing portions (e) are formed becomes relatively thinner than the original thickness of the plate forming the bottom chassis  17 . 
     In this state, the bottom chassis  17  on which the embossing portions (e) are formed is placed on the second lower mold  41 , and the second upper mold  42  is moved downward to press the embossing portions (e) to deform the embossing portions (e) into a flat shape. 
     While the inner portion of each of the embossing portions (e) is easily deformed by the second upper mold  42  because the inner portion of each of the embossing portions (e) is spaced apart from the upper surface of the second lower mold  41 , the outer line of each of the embossing portions (e) and the portion adjacent to the outer line are not easily deformed because they are directly or indirectly supported by the second lower mold  41 . Accordingly, after the inner portion of each of the embossing portions (e) has been deformed by the force applied by the second upper mold  42 , most of the force exerted by the second upper mold  42  is used to press the outer line of each of the embossing portions (e) and the portion adjacent to the outer line. 
     Thus, the outline of each of the reinforcing patterns  17   c  manufactured through the above process has a higher density than the inner portion thereof, contributing to an increase in the strength and rigidity of the bottom chassis  17 . 
     In this embodiment, the reinforcing patterns  17   c  forming the reinforcing pattern array are formed in such a manner that the outline lines of the reinforcing patterns  17   c  are formed in a regular hexagon, and are connected to each other vertically and horizontally to form a substantially honeycomb-like shape. 
     The depressed portions  17   d , which serve to divide the rear portion  17   a  of the bottom chassis  17  into a plurality of spaces, are formed in a substantially rectangular ring shape at a center portion of the rear portion  17   a  of the bottom chassis  17 . In this embodiment, three of the depressed portions  17   d  in a rectangular shape are formed to be connected to each other, and the printed circuit boards are disposed inside the depressed portions  17   d . That is, the depressed portions  17   d  also serve to partition the arrangement region of the above-described printed circuit boards. 
     The depressed portions  17   d  serve to increase the strength of the central portion of the rear portion  17   a  of the bottom chassis  17 , and the effect of increasing the strength by the depressed portions  17   d  is proportional to the height of the depressed portions  17   d . Therefore, in order to obtain a sufficient strength increasing effect by the depressed portions  17   d , the height of the depressed portions  17   d  must be made higher than a predetermined height. 
     However, as described above, since the reinforcing pattern array is formed on the rear portion  17   a  of the bottom chassis  17  to increase the strength and rigidity of the bottom chassis  17 , it is possible to form the depressed portions  17   d  relatively lower than the conventional ones instead of forming the reinforcing patterns  17   c.    
     In this embodiment, the reinforcing pattern array is formed entirely on the bottom chassis  17 , but the present disclosure is not limited thereto. For example, as illustrated in  FIG. 6 , a display apparatus according to a second embodiment of the present disclosure may include a bottom chassis  17 - 1  provided such that the reinforcing patterns  17   c  are not formed on the depressed portions  17   d  and the regions inside the depressed portions  17   d  where the sufficient strength is ensured by the depressed portions  17   d  and such that the reinforcing pattern array formed by the reinforcing patterns  17   c  is limitedly formed only on the outer side of the depressed portions  17   d.    
     Also, as illustrated in  FIG. 7 , in a case where a bottom chassis  17 - 2  of a display apparatus according to a third embodiment of the present disclosure is applied to a display apparatus having a relatively small size, the bottom chassis  17 - 2  may have sufficient strength and rigidity even if only the reinforcing pattern array by the reinforcing patterns  17   c  is formed on the bottom chassis  17 - 2  without the depressed portions  17   d.    
     Although the bottom chassis  17  according to the display apparatus of the first embodiment is formed in a substantially rectangular flat plate shape, the present disclosure is not limited thereto. For example, as illustrated in  FIG. 8 , in a case where a bottom chassis  17 - 3  of a display apparatus according to a fourth embodiment of the present disclosure is applied to a curved display apparatus, the bottom chassis  17 - 3  is formed such that opposite side ends of the bottom chassis  17 - 3  are bent so as to protrude forward as compared with a center portion of the bottom chassis  17 - 3 . The reinforcing patterns  17   c  of the present disclosure may also be formed on the curved bottom chassis  17 - 3  to increase the strength and rigidity of the curved bottom chassis  17 - 3 . 
     Since the display apparatus according to the first embodiment includes the backlights  12  and  13  to supply light to the display panel  11  made of a liquid crystal panel, the bottom chassis  17 , which is a support plate, supports the backlights  12  and  13 , but the present disclosure is not limited thereto. For example, as illustrated in  FIG. 9 , in a case where a display panel  11 - 1  of a display apparatus according to a fifth embodiment of the present disclosure is made of an organic light emitting diode panel, the backlights  12  and  13  are not required. Therefore, it is also possible to attach the display panel  11 - 1  to the bottom chassis  17 , which is a support plate, so that the bottom chassis  17  may directly supports the display panel  11 - 1 . 
     The display apparatus according to the first embodiment includes the backlights  12  and  13  of an edge type including the light guide plate  13  and the light sources  12  arranged to face the opposite side surfaces of the light guide plate  13 , and the bottom chassis  17 , which is a support plate, supports the light guide plate  13 , but the present disclosure is not limited thereto. 
     That is, as illustrated in  FIG. 10 , in a case where a display apparatus according to a sixth embodiment of the present disclosure includes a direct-type backlight  12 - 1  for supplying light to the display panel  11  and the backlight  12 - 1  includes a substrate  12   b - 2  disposed to be spaced apart from the rear of the display panel  11  and light-emitting diodes  12   a - 1  arranged on the substrate  12   b - 2 , it is also possible for the bottom chassis  17 , which is a support plate, to support a substrate  12   b - 1  of the backlight  12 - 1 . 
     In the above embodiments, the reinforcing patterns  17   c  are illustrated as being formed in a regular hexagon, but this is only an example. That is, the reinforcing patterns  17   c  may be formed in various shapes such as polygons other than a regular hexagon, a circle, an ellipse, and combinations thereof. 
     Also, in the above embodiments, it has been mainly described that the bottom chassis  17  serves as a support plate for supporting the components of the display unit  10 , but the present disclosure is not limited thereto. For example, the bottom chassis  17  may serve to form a space for accommodating the display panel  11  or the backlights  12  and  13 , and may also serve as a radiating plate to help release heat generated in the printed circuit boards. 
     Although a few embodiments of the present disclosure have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the present disclosure in the scope of which is defined in the claims and their equivalents.