KR102429117B1 - Back light unit and display device - Google Patents

Abstract

The present invention provides a backlight unit including a light guide plate and a bottom plate, wherein the bottom plate includes a bottom surface supporting the light guide plate and a bracket screwed to a set frame, the bracket extending from the bottom surface of the bottom plate It includes a first surface, a second surface extending by bending from the first surface, and a third surface extending by bending from the second surface, wherein at least one screw hole is located on the third surface, the first surface and the second surface It may include a slit parallel to the boundary of the

Description

Backlight unit and display device {BACK LIGHT UNIT AND DISPLAY DEVICE}

The present invention relates to a backlight unit and a display device.

As the information society develops, the demand for a display device for displaying an image is increasing in various forms. Recently, a liquid crystal display (LCD), a plasma display panel (PDP), and an organic light emitting diode Various display devices such as an organic light emitting diode display device (OLED) are being used.

Among these display devices, a liquid crystal display (LCD) includes an array substrate including a thin film transistor, which is a switching element for controlling on/off of each pixel region, and a color filter and/or a black matrix. It consists of an upper substrate, a display panel including a liquid crystal material layer formed therebetween, a driving unit for controlling the thin film transistor, and a backlight unit (BLU) that provides light to the display panel. , a device that displays an image by adjusting the arrangement of the liquid crystal layer according to the electric field applied between the pixel (PXL) electrode and the common voltage (Vcom) electrode provided in the pixel area and thus the transmittance of light accordingly.

In the case of such a liquid crystal display device, there must be a backlight unit that provides light from the outside, and such a backlight unit includes a light source, a light guide plate, a reflector, and the like, and a bottom plate supporting the light source, the light guide plate, the reflector, etc. .

The backlight unit is coupled to the set frame together with the display panel positioned thereon. At this time, since the bottom plate and the set frame positioned in the backlight unit are coupled, the backlight unit and the display panel are coupled to the set frame.

In general, the bottom plate and the set frame may be screwed together. In this case, an external force (eg, a deformation force) may be applied to the backlight unit and the display panel by torque generated by the screw. In addition, cracks or light leakage may occur in the display panel due to such an external force.

Against this background, it is an object of the present invention to provide a technique for mitigating the transmission of external force generated to the screw-coupled portion of the bottom plate to the backlight unit and the display panel.

In order to achieve the above object, in one aspect, the present invention provides a backlight unit including a light guide plate and a bottom plate, wherein the bottom plate includes a bottom surface supporting the light guide plate and a bracket screwed to a set frame and the bracket includes a first surface extending from the bottom surface of the bottom plate, a second surface extending by bending from the first surface, and a third surface extending by bending from the second surface, and at least one or more surfaces on the third surface The screw hole is positioned and may include a slit parallel to the boundary line between the first surface and the second surface.

In another aspect, the present invention provides a display device including a light guide plate, a bottom plate, a guide panel, and a display panel, wherein the bottom plate includes a bottom surface supporting the light guide plate and a bracket screwed to a set frame, The bracket includes a first surface extending from the bottom surface of the bottom plate, a second surface extending by bending from the first surface, and a third surface extending by bending from the second surface, and at least one screw hole on the third surface This location may include a slit parallel to the boundary line between the first surface and the second surface. In addition, the guide panel may be supported by the bottom plate and the display panel may be seated on the guide panel.

As described above, according to the present invention, there is an effect of mitigating the transmission of external force generated in the screw-coupled portion of the bottom plate to the backlight unit and the display panel.

1 is a top view of a display device according to an exemplary embodiment.
FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1 .
FIG. 3 is an enlarged view of area B of the bottom plate of FIG. 1 .
4 to 6 are views illustrating different examples of the positions of the slits 134 .
7 is a view showing an embodiment in which the groove is located in the bracket.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Also, in describing the components of the invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, or order of the elements are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It should be understood that elements may be “connected,” “coupled,” or “connected.” In the same vein, when it is described that a component is formed "on" or "below" another component, the component is both formed directly or indirectly through another component on the other component. should be understood as including

1 is a top view of a display device according to an exemplary embodiment, and FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1 .

Referring to FIG. 1 , the display device 100 may include a display panel 120 and a bottom plate 110 supporting the display panel 120 from a bottom surface and guiding or supporting the display panel 120 from upper, lower, left, and right sides.

The bottom plate 110 may include a bracket 130 , and may be screw-coupled to a set frame (not shown) through a screw hole 132 positioned in the bracket 130 .

The bracket 130 is located at the outer portion of the bottom plate 110 in a plan view, and in the embodiment shown in FIG. 1 , the bracket 130 is located at two upper portions and two lower portions of the bottom plate 110 .

In a plan view, the display panel 120 may be positioned inside the bottom plate 110 , and the bracket 130 may be positioned outside the bottom plate 110 .

The bracket 130 may include only one screw hole 132 , but may include two or more screw holes 132 according to an embodiment. In the embodiment shown in FIG. 1 , the bracket 130 is illustrated to include two screw holes 132 .

Referring to FIG. 2 , the bottom plate 110 is positioned on the lower side and positioned on the upper part of the reflective plate 224 , the light guide plate 222 , the optical sheet 226 , the light source 228 , the light source module 227 , and the guide panel. (230) and the like can be supported.

The light source 228 may be a Light Emitting Diode (LED), and the light source module 227 may be an LED driving board that supplies power to the LED. In FIG. 2 , the light source module 227 is shown to be positioned on the side of the light source 228 - a position opposite to the light guide plate 222 - but according to an embodiment, the light source module 227 is positioned above the light source 228 Alternatively, it may be located below the light source 228 .

A light guide plate 222 for diffusing the light to the entire area of the display panel 240 is disposed in a direction in which light is emitted from the light source 228 . In addition, a reflective plate 224 is disposed on the bottom surface of the light guide plate 222 to reflect light in the direction of the display panel 240 . In addition, an optical sheet 226 having purposes such as brightness enhancement, light diffusion and protection may be disposed above the light guide plate 222 .

The guide panel 230 is fixedly coupled to the inner surface of the bottom plate 110 and is a plastic structure for attaching the display panel 240 from the upper side while covering a portion of the front surface of the light guide plate 222 .

The guide panel 230 can support a part of the light source on the light incident side, and on the non-light incident side, the bottom surface of the guide panel 230 is fixed to the inner surface of the bottom plate 110 by double-sided tape 260 and the like and extends in the horizontal direction. The horizontal support part serves to support and support the display panel 240 from below.

At this time, the double-sided tape 260 not only adheres the lower surface of the guide panel 230 to the inner surface of the bottom plate 110 , but also attaches a portion of the lower surface of the light guide plate 222 or the lower surface of the reflecting plate 224 to the bottom plate 110 . It performs the function of bonding with the inner surface.

The display panel 240 may be seated on an upper side of the guide panel 230 . In this case, the display panel 240 may be attached to the guide panel 230 through an adhesive member (eg, double-sided tape).

According to this attachment or coupling, the bottom plate 110 may be directly or indirectly coupled to the light guide plate 222 and the display panel 240 . In addition, the bottom plate 110 is screw-coupled to the set frame (not shown), and external force generated from the screw-connection may be transmitted to the light guide plate 222 and the display panel 240 coupled to the bottom plate 110 . .

The display device 100 according to an exemplary embodiment includes a structure for mitigating transmission of the external force to the light guide plate 222 and the display panel 240 .

The bottom plate 110 supports the light guide plate 222 , the guide panel 230 , and the like through the bottom surface. In addition, the bottom plate 110 may be screw-coupled to the set frame (not shown) through the bracket 130 while including the bracket 130 . A screw hole 132 is located in the bracket 130 , and the bracket 130 is screw-coupled to a set frame (not shown) through the screw hole 132 .

On the other hand, when the screw is coupled to the screw hole 132 , a deformation force is generated in the bracket 130 by the torque generated by the screw coupling, and this deformation force is applied to the light guide plate 222 through the side and bottom surfaces of the bottom plate 110 . and the display panel 240 may cause problems such as light leakage or cracks.

The bracket 130 according to an embodiment may include a slit 134 in the bracket 130 to block transmission of such a deformation force. The slit 134 blocks external force generated by the bracket 130 - for example, a deformation force - from being transmitted to the bottom surface of the bottom plate 110 .

Conversely, a load may be applied to the display panel 240 . The slit 134 in the bracket 130 also functions to mitigate damage to the display panel 240 caused by the load applied to the display panel 240 . .

For example, a load may be applied to the display panel 240 in order to verify the reliability of the display panel 240 . The load applied to the display panel 240 may be transferred to the bracket 130 on the bottom plate 110 and then transferred back to the set frame (not shown). In this case, when the load transferred to the set frame (not shown) is completely transferred back to the display panel 240 according to the action-reaction principle, a crack may occur in the display panel 240 .

The slit 134 in the bracket 130 functions to buffer the load applied to the display panel 240 . Specifically, the slit 134 buffers the load by preventing the load applied to the display panel 240 from being transferred to the display panel 240 as it is.

FIG. 3 is an enlarged view of area B of the bottom plate of FIG. 1 .

Referring to FIG. 3 , the bracket 130 includes a first surface 310 extending from the bottom surface of the bottom plate 110 , a second surface 320 extending bent from the first surface 310 , and a second surface It may include a third surface 330 bent and extended at 320 . In addition, at least one screw hole 132 may be positioned on the third surface 330 .

The bracket 130 may include a slit 134 long open in one direction, and the slit 134 may be parallel to the boundary line direction (X direction) of the first surface 310 and the second surface 320 . can

The external force generated in the screw hole 132 propagates from the third surface 330 to the first surface 310 in a direction perpendicular to the boundary line direction (X direction) of the first surface 310 and the second surface 320 . However, since the slit 134 is arranged parallel to the X direction, it is possible to effectively block the propagation of the external force.

Two or more screw holes 132 may be positioned on the third surface 330 of the bracket 130 . In addition, the length W1 of the third surface 330 in the extending line direction of the two or more screw holes 132 may be shorter than the long axis length W2 of the slit 134 . In other words, the length W2 of the slit 134 may be longer than the length W1 of the bracket 130 . Here, the extension direction of the two or more screw holes 132 may be parallel to the boundary line direction (X direction) of the first surface 310 and the second surface 320 .

In more detail with respect to the length W2 of the slit 134 , the length W2 of the slit 134 may be longer than the length W1 of the third surface 330 in the X direction by a predetermined amount, respectively. For example, the length W2 of the slit 134 may be 1.0 mm or more longer in one side than the length W1 of the third surface 330 .

4 to 6 are views showing different examples of the positions of the slits 134 .

Referring to FIG. 4 , the slit 134a may be located on the first surface 310 . When the slit 134 is located on the first surface 310, there is an advantage in that it is easy to manufacture.

Referring to FIG. 5 , the slit 134b may be located at the boundary between the first surface 310 and the second surface 320 . The external force generated on the third surface 330 is transmitted to the first surface 310 via the second surface 320 , and the slit 134b is positioned at the boundary between the second surface 320 and the first surface 310 . If it is, it is possible to effectively block the external force transmitted to the second surface 320 from passing over to the first surface 310 .

Conversely, the load applied to the display panel 240 may be transferred to the second surface 320 through the first surface 310 , and the slit 134b positioned at the boundary is disposed from the first surface 310 to the second surface. It is possible to effectively block the load transferred to the 320 .

Referring to FIG. 6 , the slit 134c may be located on the second surface 320 . At this time, since the length of the slit 134c is longer than the length W1 of the third surface 330 , the length of the second surface 320 in the boundary line direction (X direction) is longer than the length of the slit 134c .

A groove may be positioned in a portion of the third surface 330 to block propagation of an external force between the third surface 330 and the first surface 310 .

7 is a view showing an embodiment in which the groove is located in the bracket.

Referring to FIG. 7 , the third surface 330 of the bracket 130 may have a groove 710 dug inward from the outside in a portion adjacent to the second surface 320 . These grooves 710 may be located on both sides of the boundary between the third surface 330 and the second surface 320 .

An embodiment of the present invention has been described above. The bottom plate and the set frame may be screw-coupled. In this case, an external force (eg, a deformation force) may be applied to the backlight unit and the display panel by torque generated by the screw. In addition, cracks or light leakage may occur in the display panel due to such an external force. A backlight unit and a display device according to an embodiment have a bracket structure that blocks the propagation of such an external force.

In an embodiment, the bottom plate includes a bottom surface supporting the light guide plate and a bracket screwed to the set frame. In addition, the bracket includes a first surface extending from the bottom surface, a second surface extending by bending from the first surface, and a third surface extending by bending from the second surface. In addition, at least one screw hole is located on the third surface, and a slit parallel to the boundary line between the first surface and the second surface is located on one of the first surface and the second surface or at the boundary portion thereof. Through this structure, the bracket may block or mitigate the propagation of external force generated by screw coupling to the display panel. In addition, the bracket can relieve a load applied to the display panel through this structure.

Terms such as "include", "compose" or "have" described above mean that the corresponding component may be embedded unless otherwise stated, so it does not exclude other components. It should be construed as being able to further include other components. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless otherwise defined. Terms commonly used, such as those defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related art, and are not interpreted in an ideal or excessively formal meaning unless explicitly defined in the present invention.

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (10)

light guide plate; and
and a bottom plate including a bottom surface supporting the light guide plate and a bracket screwed to a set frame,
The bracket includes a first surface extending from the bottom surface, a second surface bent from the first surface, and a third surface bent from the second surface and extended outwardly of the bottom plate, At least one screw hole is positioned on the third surface, and the slit is positioned parallel to the boundary line between the first surface and the second surface
A backlight unit comprising a. According to claim 1,
The slit is a backlight unit positioned at a boundary between the first surface and the second surface. According to claim 1,
Two or more screw holes are located on the third surface,
A length of the slit is longer than a length of the third surface in an extension direction of the two or more screw holes. 4. The method of claim 3,
The length of the slit is longer than the length of the third surface by 1.0 mm or more on one side of the backlight unit. According to claim 1,
A backlight unit having a groove dug inward from the outside in a portion adjacent to the second surface on the third surface. 6. The method of claim 5,
The groove is located on both sides of the boundary between the third surface and the second surface. According to claim 1,
The bracket is a backlight unit positioned at two or more, respectively, on the upper and lower outer portions in a plan view. light guide plate;
a bottom plate including a bottom surface supporting the light guide plate and a bracket screwed to a set frame;
a guide panel supported by the bottom plate; and
Including; a display panel mounted on the guide panel;
The bracket includes a first surface extending from the bottom surface, a second surface bent from the first surface, and a third surface bent from the second surface and extended outwardly of the bottom plate, At least one screw hole is positioned on the third surface, and the slit is positioned parallel to the boundary line between the first surface and the second surface
A display device comprising a. 9. The method of claim 8,
Two or more screw holes are located on the third surface,
A length of the slit is longer than a length of the third surface in an extension direction of the two or more screw holes. 9. The method of claim 8,
A display device in which a groove cut inward from the outside is positioned in a portion of the third surface adjacent to the second surface.

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