KR102093742B1 - Bottom cover and back light unit having the same - Google Patents

Abstract

The embodiment can support and fix the light guide plate that prevents minute flow of the light guide plate so that the light guide plate can efficiently convert the point light source, and the flow of the light guide plate according to the case where the light guide plate contracts and expands depending on the environment inside and outside. As an invention of a bottom cover and a backlight unit having the same, which can prevent and prevent the light guide plate from being damaged due to the flow of the light guide plate during the impact drop test process of the liquid crystal display device, the light guide plate and the light on one side of the light guide plate And an elastic support formed in an area of a bottom cover corresponding to the other side of the light guide plate and the light guide plate and the light guide plate and the light guide plate, wherein the elastic support is from a bottom portion, an edge of the bottom portion A side portion extending in an upward direction and extending inward from one region of the side portion Including sex support, and the resilient support may be formed by cutting the work area of the side surface portion.

Description

A bottom cover and a backlight unit having the same {BOTTOM COVER AND BACK LIGHT UNIT HAVING THE SAME}

The present invention relates to a bottom cover and a backlight unit having the same.

A liquid crystal display (Liquid Crystal Display) is a small, as well as a large share in the large display market. When power is supplied to a liquid crystal panel in which liquid crystal is injected between two thin glass substrates, the image is generated by generating contrast according to changes in the liquid crystal molecule arrangement It is a device that displays.

According to the driving method of liquid crystal, which is one of the core materials of the liquid crystal display device, it is divided into three types: TN, IPS, and VA.

In the case of the first commercially available TN (Twisted Nematic), a rice grain-shaped liquid crystal element is twisted in the liquid crystal panel.

When the liquid crystal is in a horizontal state and then powered on, it moves vertically.

 The TN method has the simplest structure and has a good response speed, but has a limitation in viewing angle.

To improve this, IPS (In-Plane Switching) and VA (Vertical Alignment) methods were developed.

In the case of the IPS method, the liquid crystal is arranged horizontally, whereas in the VA method, the molecules of the liquid crystal are arranged vertically.

In the case of the IPS method, the liquid crystal molecules in the horizontal direction are rotated sideways using a magnetic field.

Since the IPS method has excellent transmittance uniformity and can obtain a wide viewing angle without using an optical film, it can be widely used in professional and high-end liquid crystal displays of 18 inches or more.

This method has a disadvantage that the light leakage phenomenon is large and the contrast ratio is low compared to other methods.

In addition, in the VA method, when the power is not turned on, the liquid crystal molecules are vertically driven, and when the power is turned on, the liquid crystal molecules are driven horizontally, and the contrast ratio is good. However, there is a disadvantage in that the response speed is low compared to other methods.

 On the other hand, the liquid crystal display device is an organic light emitting display device (Organic light-emitting display device) and the like, since it is a non-emissive type, it is necessary to use a backlight unit as a back light source.

The backlight unit serves to provide uniform light over the entire area of the liquid crystal panel.

 In addition, the backlight unit is divided into an edge type and a direct type according to the position of the light source unit.

The edge type is a structure in which a light source is disposed on the side of a light guide plate, and is mainly applied to a relatively small liquid crystal display device such as a laptop type and a notebook computer.

Such an edge type backlight unit has good light uniformity, a long endurance life, and is advantageous for thinning of a liquid crystal display device. The edge type backlight unit includes a light source for generating light, a light source cover surrounding the light source, and an optical sheet for improving light characteristics.

Meanwhile, a light emitting diode (LED) is often used as a light source.

The light emitting diode is a point light source, and in order to be used in a display, it is necessary to convert the point light source to a surface light source.

The configuration for converting a point light source to a surface light source is a light guide plate, and is used in a backlight unit of a liquid crystal display device.

The light guide plate is accommodated in a bottom cover constituting the backlight unit.

The light guide plate may be finely flowed in the left and right and up and down directions within the bottom cover.

As described above, when there is a minute flow of the light guide plate, a problem that it is difficult to efficiently convert from a point light source to a surface light source may occur.

This problem leads to a problem of deterioration in luminance and poor image quality.

In addition, the light guide plate may contract and expand according to internal and external environments, and accordingly, the flow of the light guide plate may be greater.

In addition, before the liquid crystal display device is shipped as a finished product, it undergoes an impact and drop test process, and in this case, when the light guide plate is not stably fixed, there is a problem of cracking.

As such, it is an important problem that the light guide plate is stably fixed and supported in the bottom cover.

According to an embodiment, an elastic support for supporting and fixing a light guide plate that prevents minute flow of the light guide plate and efficiently converts a point light source into a surface light source, and a backlight unit having a bottom cover and a bottom cover having the same are provided.

According to an embodiment, an elastic support for supporting and fixing the light guide plate and preventing the flow of the light guide plate according to the case where the light guide plate contracts and expands depending on the environment inside and outside, and a backlight unit having a bottom cover and a bottom cover having the same to provide.

According to an embodiment, during the impact drop test process of the liquid crystal display device, an elastic support for supporting and fixing the light guide plate that can prevent the light guide plate from being damaged due to the flow of the light guide plate, and a backlight unit having a bottom cover and a bottom cover having the same Gives

Bottom cover according to an embodiment of the present invention, the bottom portion; A side portion extending upward from an edge of the bottom portion; And an elastic support extending inward from a region of the side portion, wherein the elastic support is formed by cutting one region of the side portion.

The bottom cover according to an embodiment of the present invention, the elastic support is connected to the side portion, a first region extending in a direction parallel to the bottom portion, a second region connected to the first region and a curved surface, and The bottom cover includes a third region connected to the second region and extending in an outer direction of the side portion.

In the bottom cover according to the embodiment of the present invention, the first area and the side portion are bottom covers forming an angle of 20 to 25 degrees.

In the bottom cover according to the embodiment of the present invention, the second area is a bottom cover corresponding to the central area of the side portion.

In the bottom cover according to the embodiment of the present invention, the elastic support includes first and second elastic supports, and the first and second elastic supports are formed symmetrically on both sides with respect to the center region of the side portion. Bottom cover.

In the bottom cover according to the embodiment of the present invention, the first area is a bottom cover whose width is reduced while reaching from the side portion to the second area.

The backlight unit according to the embodiment of the present invention, a light guide plate; A light source providing light on one side of the light guide plate; A bottom cover accommodating the light guide plate and the light source; And an elastic support formed in an area of the bottom cover corresponding to the other side of the light guide plate, wherein the elastic support includes: a bottom portion; A side portion extending upward from an edge of the bottom portion; And an elastic support extending inward from a region of the side portion, wherein the elastic support is formed by cutting one region of the side portion.

In the backlight unit according to an embodiment of the present invention, the elastic support is connected to the side portion, a first region extending in a direction parallel to the bottom portion, a second region connected to the first region and a curved surface, and A backlight unit connected to the second region and including a third region extending in an outer direction of the side portion.

In the backlight unit according to an embodiment of the present invention, the first area and the side portion of the backlight unit form an angle of 20 to 25 degrees.

In the backlight unit according to the exemplary embodiment of the present invention, the second region corresponds to a central region of the side portion.

In the backlight unit according to an embodiment of the present invention, the elastic support includes first and second elastic supports, and the first and second elastic supports are formed symmetrically on both sides with respect to the center region of the side portion. Backlight unit.

In the backlight unit according to the exemplary embodiment of the present invention, the first area is a backlight unit having a width that decreases from the side portion to the second area.

In the backlight unit according to the embodiment of the present invention, the distance from the upper end section to the lower end section of the second region is the same as the height of the other side of the light guide plate.

The embodiment may support and fix the light guide plate that prevents minute flow of the light guide plate and allows the light guide plate to efficiently convert a point light source to a surface light source.

The embodiment can prevent the flow of the light guide plate according to the case where the light guide plate contracts and expands depending on the environment inside and outside.

During the impact drop test process of the liquid crystal display device, damage to the light guide plate due to the flow of the light guide plate can be prevented.

1 is an exploded perspective view of a backlight unit according to an embodiment of the present invention.
2 is a plan view of a bottom cover according to an embodiment of the present invention.
FIG. 3 is an enlarged view of a dotted portion of FIG. 2 and is a view showing a cut-out area of the side surface of the bottom cover for forming the elastic support.
FIG. 4 is an enlarged view of the dotted portion of FIG. 2, and is a view of the side surface of the bottom cover as viewed from the front.
FIG. 5 is an enlarged view of the dotted portion of FIG. 2, and is a view of a side portion of the bottom cover as viewed from above.
FIG. 6 is an enlarged view of the dotted portion of FIG. 2, and is a view of a side portion of the bottom cover viewed in a diagonal direction.
7 is a graph showing the amount of permanent change of the elastic support according to the angle between the elastic support and the side portion.
8 is a plan view of a backlight unit according to an embodiment of the present invention.
9 is a plan view of a bottom cover according to another embodiment of the present invention.
10 and 11 are another embodiment of the present invention, and are enlarged views of the dotted line of FIG. 2.
12 and 13 are cross-sectional views of a backlight unit according to an embodiment of the present invention.
14 is a view showing a liquid crystal display device according to an exemplary embodiment of the present invention.

Hereinafter, with reference to the drawings of the bottom cover and the backlight unit having the same according to an embodiment of the present invention will be described in detail.

The embodiments introduced below are provided as examples in order to sufficiently convey the spirit of the present invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. In addition, in the drawings, the size and thickness of the device may be exaggerated for convenience.

Throughout the specification, the same reference numbers indicate the same components.

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

An exploded perspective view of the backlight unit 500 according to an embodiment of the present invention will be described with reference to FIG. 1.

The backlight unit 500 may include a light guide plate 400 disposed in parallel with the light source 300 to convert point light into surface light.

The backlight unit 500 is disposed under the light guide plate 400 and reflects light traveling toward the bottom of the light guide plate 400 toward the upper direction of the light guide plate 400 and the reflective sheet 410 and the light source 300 ), The light guide plate 400 and the bottom cover 100 for receiving the reflective sheet 410 may be included.

The backlight unit 500 may further include a heat radiation plate 310.

The heat radiation plate 310 may include a wiring pattern through which a driving signal for driving the light source 300 is input, and may include a pad portion on which the light source 300 is mounted.

That is, the heat dissipation plate 310 may have a function of aligning the light source 300.

In addition, the heat dissipation plate 310 may have a heat dissipation function to conduct heat generated from the light source 300 to the bottom cover 100.

2 is a plan view of a bottom cover according to an embodiment of the present invention.

Referring to FIG. 2, the bottom cover 100 according to the first embodiment of the present invention may include a bottom portion 110, a plurality of side portions 120, and an elastic support 200.

A plurality of side portions 120 surrounding the bottom portion 110 and the bottom portion 110 and extending upward from an edge of the bottom portion 110 may form a storage space.

Specifically, side surfaces 120 may be formed on at least one of the four sides of the bottom part 110.

In the drawing, the side portion 120 is formed on all four sides of the bottom portion 110, but is not limited thereto.

That is, the side portion 120 may be formed only on the other side except one of the four sides of the bottom portion 110.

The elastic support 200 may have a cantilever shape.

Specifically, the elastic support 200 may be formed to extend inwardly from one region of any one of the plurality of side portions 120 in the inner direction, that is, the A direction in the drawing.

The elastic support 200 may be formed by cutting an area of the side part 120.

Specifically, a central region among the entire regions of the side portion 120 and an upper region among the central regions may be cut (cut) to form.

The elastic support 200 may be formed to protrude in the A direction.

When the external force acts on the elastic support body 200, the elastic support body 200 has an internal force called resistance force and deformation force generated therein.

As described above, since the elastic support 200 has elasticity, when a force is applied in the B direction, it may have a property of raising back in the A direction.

That is, the flow of the light guide plate 400 can be prevented by using the elastic restoring force characteristics of the elastic support 200.

The bottom cover 100 may have a metal material that is easily thermally conductive, and the elastic support 100 formed by cutting a portion of the bottom cover 100 of the metal material may have elasticity.

The bottom cover 100 is not limited to a metal material.

The bottom cover 100 may be made of a plastic material, and since the plastic material may also have elasticity, an elastic support 200 may be formed from the bottom cover 100 made of a plastic material.

Since the elastic support 100 formed on the bottom cover 100 is formed from a partial region of the side portion 110 of the bottom cover 100, the side portion and the elastic support 100 are integrally formed and may be the same material. .

A light guide plate (not shown) may be inserted between the elastic support 100 and the side portion 120 on which the elastic support 100 is formed and the side portion 120 facing each other.

In addition, a light source (not shown) may be disposed on the side portion 120 facing the side portion 120 on which the elastic support 100 is formed.

That is, the elastic support 100 may be formed on any one of the four side portions 120 in the drawing, but may be specifically formed on the side portion 120 opposite the light source (not shown).

FIG. 3 is an enlarged view of a dotted portion of FIG. 2 and is a view showing a cut-out area of the side surface of the bottom cover for forming the elastic support.

FIG. 4 is an enlarged view of the dotted portion of FIG. 2, and is a view of the side surface of the bottom cover as viewed from the front.

FIG. 5 is an enlarged view of the dotted portion of FIG. 2, and is a view of a side portion of the bottom cover as viewed from above.

FIG. 6 is an enlarged view of the dotted portion of FIG. 2, and is a view of a side portion of the bottom cover viewed in a diagonal direction.

Referring to FIG. 3, the elastic support 200 may be formed by cutting a dotted portion in the side part 120 of the bottom cover 100.

Specifically, in the upper region among the central regions of the side portion 120, a part of the side portion 120 is cut in a direction perpendicular to the bottom portion 110, and is formed by cutting in a direction parallel to the bottom portion 110. can do.

That is, an elastic support 200 may be formed by cutting a portion of the side portion 120 in a b-shape.

3 to 6, the elastic support 200 may include first to third regions 210, 220 and 230.

The first region 210 may be connected to the side part 120 and may be formed to extend in a direction parallel to the bottom part 110.

The second region 220 may be bent in the direction of the outside of the side portion 120 (outside direction of the bottom cover 100) so as to be connected to the first region 210 and have a curved shape.

The third region 230 may be connected to the second region 220 and may be formed to extend in the direction of the outside of the side portion 120 (outside direction of the bottom cover 100).

That is, the first to third regions 210, 220, and 230 may be integrally formed as one, and may have a cantilever shape, that is, a curved shape.

7 is a graph showing the amount of permanent change of the elastic support according to the angle between the elastic support and the side portion.

Referring to FIG. 7, the horizontal axis of the graph represents the angle formed by the first region 210 and the side portion 120 of the elastic support 200, and the vertical axis represents the permanent change amount of the elastic support 200.

The first region 210 of the elastic support 200 and the side portion 120 of the bottom cover 100 may have various angles with each other, but preferably have an angle between 20 and 25 degrees.

When an external force (external force in the B direction) is applied to the elastic support 200, an internal force (internal stress in the A direction) is generated.

At this time, when an external force is applied to the elastic support 200, a phenomenon that does not return to the original position, that is, can be permanently deformed.

Furthermore, when the force of the external force reaches the intrinsic limit of the elastic support 200, it cannot be resisted by the external force and can be destroyed. Therefore, it is important to properly set the relationship between the force of the external force applied to the elastic support 200 and the amount of permanent deformation.

커지면 외력에 대한 변형량은 작아지지만, 동일 변위에 대한 영구 변형량은 커지는 것을 알 수 있다. 따라서 영구 변형량이 가장 적은 20도~25 사이의 각도를 가지는 것이 바람직하다.That is the angle formed by the first region 210 and the side portion 120

It can be seen that the larger the amount of deformation with respect to the external force, the greater the amount of permanent deformation with respect to the same displacement. Therefore, it is desirable to have an angle between 20 degrees and 25 with the smallest permanent deformation.

In this case, even if a force is applied to the first region 210 in the B direction, it may have an elastic force that is raised in the A direction, that is, returned to the original state.

Meanwhile, the elastic support 200 may have a curved bar shape.

Since the elastic support 200 is formed by cutting a portion of the side portion 120, the thickness of the elastic support 200, that is, the outer surface of the elastic support 200 and the inner surface facing the outer surface are formed The distance is the same as the thickness of the side portion 120.

The distance between the left end and the right end of the elastic support 200 may vary depending on the size of the bottom cover 100 and the flow distance of the light guide plate (not shown) accommodated in the bottom cover 100.

8 is a plan view of a backlight unit according to an embodiment of the present invention.

Referring to FIG. 8, the backlight unit 500 according to an embodiment of the present invention may further include a bottom cover 100, an elastic support 200, a light source 300, and a light guide plate 400.

The light guide plate 400 may disperse the light emitted from the light source 300 to provide a surface light source in an upward direction.

Specifically, the light emitted from the light source 300 may be totally reflected multiple times while traveling in the light guide plate 400.

Accordingly, the light spreads evenly over a wide area of the light guide plate 400 to be a surface light source.

The light guide plate 400 may include a pattern of a specific shape on the back surface to supply a surface light source.

The pattern (not shown) is, for example, to guide the light incident into the light guide plate 40, for example, an elliptical pattern, a polygonal pattern, a hologram pattern ) Can be variously formed.

Such a pattern may be formed on the back surface of the light guide plate 400 by a printing method or an injection method.

The light source 300 and the light guide plate 400 may be accommodated in the bottom cover 100.

The light source 300 may correspond to any one of the plurality of inner surfaces 120 of the bottom cover 100.

In this case, the elastic support 200 may be formed on the inner surface 120 of the bottom cover 100 facing the light source 300.

Although only one light source 300 is disposed in FIG. 8, the present invention is not limited thereto, and may be spaced apart from each other in a plurality.

In addition, a heat dissipation plate (not shown) may be further disposed between the light source 300 and the side portion 120.

The light guide plate 400 may be disposed in a space formed between the light source 300 and the elastic support 200.

Specifically, the second region 220 of the elastic support 200 may contact the side surface of the light guide plate 400.

8, the light guide plate 400 is illustrated as being in contact with the light source 300, but is not limited to the drawings, and the light guide plate 400 and the light source 300 may be spaced apart from each other.

When the light guide plate 400 is accommodated in the bottom cover 100, the elastic support 200 applies a force in the A direction to the light guide plate 400, so that the light guide plate 400 is attached to the bottom cover 100. Can be fixed and supported.

The worker assembling the backlight unit 500 pushes the elastic support 200 of the bottom cover 100 in the B direction.

Then, when the light guide plate 400 is accommodated in the bottom cover 100, the elastic support 200 may apply the force to the light guide plate 400 in the A direction to fix the light guide plate 400.

That is, the elastic support 200 may fix and support the light guide plate 400 by applying a force to the light guide plate 400 in the B direction by the elastic force.

Accordingly, it is possible to prevent the light guide plate 400 from flowing in the A and B directions.

In some cases, the elastic support 200 is also disposed on the other side portion 120 of the bottom cover 100, so that the light guide plate 400 can be supported and fixed in various directions.

In this case, the light guide plate 400 can be prevented from flowing in the upper, lower and left and right directions.

The second region 220 of the elastic support 200 may correspond to the central region (dotted portion in the drawing) of the side portion 120 of the bottom cover 100 on which the elastic support 200 is formed.

Since the second region 200 corresponds to the central region of the side portion 120, the second region 200 may apply a force in the B direction to the central region of the light guide plate 400.

When the elastic support 100 is formed by cutting a portion of the side portion 120 of the bottom cover 100 as described above, a separate configuration is combined with the side portion 120 to support the light guide plate 400. , The assembly process has a simple effect.

Furthermore, there is an economical effect of reducing the cost required to manufacture a separate configuration for supporting the light guide plate 400.

In addition, in general, a configuration fastened to the bottom cover 100 to support the light guide plate 400 has a SUS material, but the configuration of such a material is expensive, and there is a problem that supply and demand is not easy.

In order to solve this, in the case of supporting the light guide plate 400 using a partial area of the bottom cover 100 itself as in the present invention, it is possible to reduce the cost and simplify the manufacturing process.

9 is a plan view of a bottom cover according to another embodiment of the present invention.

Referring to FIG. 9, the bottom cover 100 according to another embodiment of the present invention includes a bottom part 100, an edge surrounding the edge of the bottom part 100, and a plurality of vertically formed parts of the bottom part 100. The side portion 120 and the elastic support 200 formed in one region of the side portion 120 of any one of the plurality of side portions 120 may be included.

The elastic support 200 may include first and second elastic supports 201 and 202.

The first and second elastic supports 201 and 202 may be formed on both sides based on a center region (based on a dotted line in the drawing) of the side portion 120.

The first and second elastic supports 201 and 202 may have symmetrical shapes with respect to each other based on a dotted line.

When the light guide plate (not shown) is accommodated in the bottom cover 100, a force in the B direction may be applied to the light guide plate (not shown).

When the first and second elastic supports 201 and 202 are formed on the side portion 120 as described above, an effect of preventing the flow of the light guide plate (not shown) to be accommodated in the bottom cover 100 may be maximized.

In addition, since the first and second elastic supports 201 and 202 have symmetrical shapes with respect to each other based on a dotted line, the central region of the side surface of the light guide plate (not shown) to be accommodated in the bottom cover 100 can be effectively supported with elastic force. have.

10 and 11 are another embodiment of the present invention, and are enlarged views of the dotted line of FIG. 2.

10 and 11, the bottom cover 100 of another embodiment of the present invention may include an elastic support 200 having an inclined structure.

The elastic support 200 may include first to third regions 210, 220 and 230, and an upper cross-section 240 and a lower cross-section 250.

The upper cross-section 240 refers to the upper surface of the elastic support 200, and the lower cross-section 250 refers to the lower surface of the elastic support 200.

A line segment perpendicular to the upper section 240 is drawn in the drawing, and the vertical line segment meets the lower section 250.

The distance between the upper section 240 and the lower section 250 meeting the vertical line segment may be gradually reduced from the first area 210 to the third area 230.

Referring to FIG. 11, the distance between the upper end section 240 and the lower end section 250 where the vertical line segment meets is smaller in the direction of the second area 220 in the case of the first area 210. The second and third regions 220 and 230 may be the same.

10 and 11, the area (C region) where the side region 120 of the first region 210 and the bottom cover 100 meet increases as the area (C region) increases, and the elastic support 200 ) Can adjust the elastic force.

The elastic support 200 having an inclined structure is cut out in a direction perpendicular to the bottom part 110 of one area of the side part 120 of the bottom cover 100, and then horizontally aligned with the bottom part 110 It can be formed by cutting partly, but cutting while having a slope.

12 and 13 are cross-sectional views of a backlight unit according to an embodiment of the present invention.

12 is a view showing a cross-section of a backlight unit 500 according to an embodiment of the present invention, the backlight unit 500 includes a bottom cover 100, an elastic support 200 and a light guide plate 400 You can.

The bottom cover 100 may include a bottom portion 110 and a side portion 120.

The bottom portion 110 of the bottom cover 100 may have an uneven shape or an embossing shape.

As described above, when the bottom portion 110 of the bottom cover 100 has an uneven or embossed shape, it is possible to minimize deformation of the bottom cover 100 by heat due to internal or external factors.

12, the shape of the edge region of the bottom portion 110 of the bottom cover 100 is curved. However, the present invention is not limited thereto, and may have an uneven or embossed shape in the entire area of the bottom portion 110.

The bottom portion 100 may include an edge region 130, an inclined region 140, and a horizontal region 150.

Specifically, the bottom portion 110 is inclined such that an angle formed between the edge region 130 and the line segment (not shown) parallel to the edge region 130 from the edge region 130 has an acute angle, and in the upward direction. An extended inclined region 140 may be included.

In addition, the bottom portion 110 may include a horizontal region 150 extending from the inclined region 140, forming a step with the edge region 130, and parallel to the edge region 130.

The upper surface of the horizontal region 150 may contact or correspond to the bottom of the light guide plate 400.

An elastic support 200 may be formed in one region of the side part 120.

The elastic support 200 includes a first region 210 connected to the side portion 120, a second region 220 connected to the first region 210 and contacting the light guide plate 400, and the second region A third region 230 connected to the 220 and extending in the side portion 120 direction may be included.

The width formed by the upper end surface 240 of the elastic support 200 and the lower end section 250 of the elastic support 200, that is, the height of the elastic support 200 is the width of the side surface of the light guide plate 400 (light guide plate 400 ), The distance from the upper surface to the lower surface perpendicularly).

Specifically, the height of the second region 220 of the elastic support 200 (the distance between the upper end 240 and the lower end 250 of the second region 220 in the vertical direction) is the light guide plate 400. It can be the same as the width of the side.

The height of the second region 220 may be the same as the height of the light guide plate 400, which may increase the contact area between the second region 220 and the light guide plate 400.

Thus, the elastic support 200 can maximize the elastic force applied to the light guide plate 400, which helps to stably support and fix the light guide plate 400.

Referring to FIG. 13, a vertical distance between the upper end surface 240 and the lower end part 250 of the elastic support 200 may be greater than the height of the light guide plate 400.

In this case, the lower cross-section 250 may reach the same plane as the bottom of the light guide plate 400.

As described above, when the lower end surface 250 cuts a region of the side portion 120 of the bottom cover 100 so as to reach the same plane as the bottom of the light guide plate 400 to be accommodated in the bottom cover 100, the The altar area of the side portion 120 may be minimized.

Minimizing the cutting area of the side portion 120 is helpful in terms of ease of operation, and prevents a decrease in the stiffness of the side portion 120, which may occur while the cutting area of the side portion 120 increases, and the light guide plate The flow of 400 can be minimized.

Meanwhile, in FIGS. 12 and 13, a reflective sheet (not shown) is not provided on the lower surface of the light guide plate 400, but when the reflective sheet is included on the lower surface of the light guide plate 400, the bottom portion 110 is horizontal. The region 150 may correspond to and contact the reflective sheet.

The second region 220 of the elastic support 200 of the above-described embodiment may have a curved shape. Thus, even when the second region 220 contacts the light guide plate 400, it is possible to prevent the scratch from being applied to the contact point of the light guide plate 400.

In addition, since the elastic support 200 has elasticity and can flow in the A and B directions, even when the light guide plate 400 contracts and expands according to internal and external environments, the elastic support 200 is used to The light guide plate 400 can be supported and fixed stably.

14 is a view showing a liquid crystal display device according to an exemplary embodiment of the present invention.

14, the liquid crystal display 600 according to an exemplary embodiment of the present invention may include a liquid crystal panel 610, a backlight unit 500, and an optical sheet 620.

The liquid crystal panel 610 serves to express an image, and the liquid crystal panel 610 may include a first substrate 611 and a second substrate 612 bonded to each other with a liquid crystal layer interposed therebetween. . In this case, although not illustrated, a plurality of gate lines and data lines cross each other to define a pixel on the inner surface of the first substrate 611 called a lower substrate or an array substrate.

In addition, a thin film transistor (TFT) is formed at each crossing point of a plurality of gate lines and data lines to be connected to a corresponding pixel electrode. In addition, red, green, and blue color filters are formed as an example corresponding to each pixel on the inner surface of the second substrate 612 called an upper substrate or a color filter substrate.

In addition, a black matrix is provided to cover the non-display elements of the first substrate 611 such as gate lines, data lines, and thin film transistors.

Here, when the liquid crystal display device 600 is driven in the vertical electric field mode, a common electrode covering the color filter and the black matrix may be further formed on the second substrate 120. In addition, polarizers (not shown) that selectively transmit only specific light may be attached to the outer surfaces of the first and second substrates 611 and 612, respectively.

Further, along at least one edge of the liquid crystal panel 610, the printed circuit board 622 may be connected via a connecting member 621 such as a flexible circuit board or a tape carrier package (TCP).

At this time, the printed circuit board 622 may be in close contact with the bottom of the bottom cover 100 during the modularization process.

The optical sheet 620 may be composed of a diffusion sheet, a prism sheet, or the like, and may improve luminance of light emitted from the light guide plate 400.

The bottom cover 100 may include an elastic support 200 and stably support and fix the light guide plate 400.

When the light guide plate 400 contracts or expands depending on the surrounding environment, or when the liquid crystal display device 600 moves, the elastic support 200 supports and fixes the light guide plate 400. The surface light source of uniform luminance may be provided to the liquid crystal panel 610 according to the light guide plate 400.

Meanwhile, the elastic support 200 induces the light guide plate 400 to be stably received in the bottom cover 100, and according to the flow of the light guide plate 400 during the impact drop test process of the liquid crystal display 600 The damage phenomenon of the light guide plate 400 can be prevented.

In the detailed description of the present invention described above, it has been described with reference to preferred embodiments of the present invention, but those skilled in the art or those of ordinary skill in the art described in the claims described below It will be understood that various modifications and changes may be made to the present invention without departing from the spirit and scope of the technology. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

100 bottom cover
110 Bottom cover bottom
120 Side part of bottom cover
130 Edge area of bottom cover bottom
140 Inclined area at the bottom of the bottom cover
150 horizontal area at the bottom of the bottom cover
200 elastic support
201 first elastic support
202 second elastic support
210 first region of elastic support
220 Second region of elastic support
230 Third area of elastic support
240 Upper cross section of elastic support
250 Lower section of elastic support
300 light source
310 heat dissipation plate
400 light guide plate
410 reflective sheet
500 backlight units
600 liquid crystal display
610 LCD panel
611 1st board
612 second substrate
621 connecting member
622 printed circuit board

Claims (13)

Bottom part;
A side portion extending upward from an edge of the bottom portion; And
It includes an elastic support extending inward from one region of the side portion,
The elastic support is formed by cutting one region of the side portion,
The elastic support,
A first region connected to the side portion and extending in a direction parallel to the bottom portion;
A second region connected to the first region and having a curved shape;
A third region connected to the second region and extending in an outer direction of the side portion; And
It includes an upper cross-section that is an upper surface of the elastic support and a lower cross-section that is a lower surface of the elastic support,
The bottom cover between the upper end section and the lower end section is getting smaller from the first area to the third area.
delete According to claim 1,
The first area and the side portion bottom cover forming an angle of 20 to 25 degrees.
According to claim 1,
The second area is a bottom cover corresponding to the central area of the side portion.
According to claim 1,
The elastic support includes first and second elastic supports,
The first and second elastic supports are bottom covers formed symmetrically on both sides with respect to the central region of the side portion.
delete Light guide plate;
A light source providing light on one side of the light guide plate;
A bottom cover including a bottom portion and a side portion extending upward from an edge of the bottom portion, and receiving the light guide plate and the light source; And
It includes an elastic support disposed in one region of the bottom cover corresponding to the other side of the light guide plate,
The elastic support is formed by cutting one region of the side portion,
The elastic support,
A first region connected to the side portion and extending in a direction parallel to the bottom portion;
A second region connected to the first region and having a curved shape;
A third region connected to the second region and extending in an outer direction of the side portion; And
It includes an upper cross-section that is an upper surface of the elastic support and a lower cross-section that is a lower surface of the elastic support,
The distance between the upper end section and the lower end section decreases as the distance from the first area to the third area decreases.
The method of claim 7,
A backlight unit further comprising a heat dissipation plate disposed between the light source and the side surface of the bottom cover.
The method of claim 7,
The first area and the side portion of the backlight unit forming an angle of 20 to 25 degrees.
The method of claim 7,
The second area is a backlight unit corresponding to the central area of the side portion.
The method of claim 7,
The elastic support includes first and second elastic supports,
The first and second elastic supports are backlight units formed symmetrically on both sides with respect to the central region of the side portion.
delete The method of claim 7,
The distance from the upper section to the lower section of the second region is the same as the height of the other side of the light guide plate.

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