KR102565594B1 - bottom cover and DISPLAY DEVICE comprising the same - Google Patents

Abstract

An embodiment of the present invention relates to a bottom surface facing a display panel, a first side surface on which a light source unit is disposed, a second side surface facing the first side surface, and third and second side surfaces connecting the first and second side surfaces. The bottom cover includes four side parts, and the third and fourth side parts each include a reflective area in which an inclined angle relative to the bottom part is in a right angle range. Since the light of the light source unit can be specularly reflected in the opposite direction by the reflective areas of the third and fourth side surfaces, the amount of light in the area adjacent to the third and fourth side surfaces is reduced, thereby preventing image quality deterioration in brightness.

Description

Bottom cover and display device including the same {bottom cover and DISPLAY DEVICE comprising the same}

The present application relates to a bottom cover and a display device including the bottom cover.

Display devices are applied to various electronic devices such as TVs, mobile phones, laptops, and tablets. Accordingly, research is being conducted to develop thinning, lightening, and low power consumption of display devices.

Representative examples of the display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electro luminescence display device. Display device: ELD), Electro-Wetting Display device (EWD), Organic Light Emitting Display device (OLED), and the like.

These display devices include flat display panels for realizing images. The display panel includes a pair of substrates bonded to each other with a light emitting material or a polarizing material interposed therebetween.

Exemplarily, the liquid crystal display device includes a display panel including a pair of substrates and a liquid crystal layer injected between the pair of substrates. A display panel of such a liquid crystal display device displays an image by adjusting light transmittance of the liquid crystal layer using an electric field applied to the liquid crystal layer of each pixel area.

However, since the display panel of the liquid crystal display device does not emit light by itself, the liquid crystal display device generally further includes a back light unit (BLU) for supplying light to the display panel.

The backlight unit may be classified into a direct type and an edge type according to the position of the light source unit.

The direct type backlight unit includes a plurality of light emitting devices disposed in a matrix form in an area facing the display panel and a light guide plate disposed between the display panel and the plurality of light emitting devices.

In the case of such a direct type backlight unit, since the display panel and the light source unit are spaced apart from each other at a relatively uniform distance in the vertical direction, there is an advantage in that luminance uniformity for each area of the display device can be improved. On the other hand, in the case of the direct type backlight unit, the thickness of the display device is increased by the area where the light source unit is disposed, which is disadvantageous in reducing the thickness of the display device. Therefore, it is common that the direct type backlight unit is provided in a large display device that is sensitive to luminance uniformity characteristics of a large area, instead of being relatively insensitive to thin characteristics.

Meanwhile, the edge type backlight unit includes a light source unit disposed in an area corresponding to an edge of the display panel and a light guide plate disposed below the display panel and converting light incident from the light source unit through a side surface into a surface light source corresponding to the display panel.

In the case of such an edge-type backlight unit, since the thickness of the display device is not increased by the area where the light source unit is disposed, there is an advantage in reducing the thickness of the display device. However, as the distance from the light source unit is different for each area of the display panel, there is a limitation in improving luminance uniformity of the display device. Accordingly, the edge-type backlight unit is generally not sensitive to luminance uniformity characteristics, but is generally provided in small display devices that are sensitive to thin characteristics and light weight characteristics for portability.

However, even in the case of a large display device, there is a trend in which thinning is required to add aesthetics to design and interior. Accordingly, there is a need for an edge-type backlight unit capable of preventing degradation of luminance uniformity in each area of the display device so as to be appropriately applied to a large-sized display device.

Meanwhile, a general backlight unit generally includes a light guide plate for guiding light from a light source unit to each area in order to improve luminance uniformity for each area. Since the light guide plate has an area larger than the display area of the display panel, there is a problem in that the weight of the backlight unit and the display device including the same is limited by the light guide plate.

Meanwhile, the liquid crystal display device generally further includes a bottom cover disposed under the backlight unit and accommodating the backlight unit.

As mentioned above, a general backlight unit includes a light guide plate for guiding light from a light source unit to a surface light source. Therefore, since the shape of the bottom cover accommodating the general backlight unit does not affect the light emission characteristics of the backlight unit, it is common that the bottom cover simply has the form of a container accommodating the backlight unit.

The present invention is to provide a bottom cover capable of preventing a decrease in luminance uniformity in each area of the display device while accommodating a backlight unit having a structure in which a light guide plate is removed so as to be advantageous in reducing weight and thickness, and a display device including the same .

In addition, the present invention provides a bottom cover capable of improving image quality deterioration in which luminance is lowered at the edge of a display area while accommodating a backlight unit that does not include a light guide plate, and a display device including the bottom cover.

The present invention relates to a bottom cover accommodating a backlight unit, and includes a bottom surface facing a display panel, a first side surface on which a light source unit is disposed, a second side surface facing the first side surface, and a space between the first and second side surfaces. It includes third and fourth side parts connecting the bottom cover, and the third and fourth side parts each include a reflective area in which an inclined angle is a right angle range relative to the bottom surface. Since the light of the light source unit can be specularly reflected in the opposite direction by the reflective areas of the third and fourth side surfaces, the amount of light in the area adjacent to the third and fourth side surfaces is reduced, thereby preventing image quality deterioration in brightness.

And, the present invention further provides a display device including a display panel, a backlight unit, and a bottom cover, the bottom cover including a bottom part and first to fourth side parts, and the third and fourth side parts including a reflective area. do.

A bottom cover according to an embodiment of the present invention includes a first side surface portion on which a light source unit is disposed, and an inclined surface area facing a display panel and having a vertical distance from the display panel gradually reduced as the distance between the flat area and the flat area increases. It includes the bottom part to

Even if the light guide plate is removed, light from the light source unit may be supplied to each area in the form of a surface light source by the first reflector disposed on the lower surface of the bottom cover. Therefore, it is possible to prevent a decrease in luminance uniformity for each region while the light guide plate is removed, which is advantageous for weight reduction and thinning.

And, the bottom cover according to an embodiment of the present invention further includes third and fourth side parts connecting between the first side part and the second side part opposite to the first side part, and the third and fourth side parts facing each other. includes a reflection area in which the angle to the base portion is a right angle range including 90 degrees and approximations of 90 degrees greater than 90 degrees, respectively.

Since the light can be specularly reflected in the opposite direction by the second reflector disposed in the reflection area of each of the third and fourth side surfaces, the amount of light is reduced in the edge area of the display area adjacent to the third and fourth side surfaces, resulting in a dark display. Poor picture quality can be improved.

A display device including such a bottom cover may be advantageous in weight reduction and thinning, and may be advantageous in size since deterioration in image quality and decrease in luminance uniformity for each area may be prevented.

1 is an exploded perspective view showing a display device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the display device of FIG. 1 in a first direction.
3 is a perspective view showing the bottom cover of FIG. 1;
FIG. 4 is a cross-sectional view of the display device of FIG. 1 in a second direction.
5 is an exploded perspective view showing a display device according to a second embodiment of the present invention.
6 is a perspective view showing the bottom cover of FIG. 5;
FIG. 7 is a cross-sectional view of the display device of FIG. 5 in a second direction.

Hereinafter, a display device according to each embodiment of the present application and a bottom cover provided therewith will be described in detail with reference to the accompanying drawings.

First, referring to FIGS. 1 to 4 , a display device and a backlight unit according to a first embodiment of the present invention will be described.

1 is an exploded perspective view showing a display device according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of the display device of FIG. 1 in a first direction. 3 is a perspective view showing the bottom cover of FIG. 1; FIG. 4 is a cross-sectional view of the display device of FIG. 1 in a second direction. For reference, in this specification, the first direction means a direction in which light is emitted from the light source unit 121 of the backlight unit 120, that is, the X-axis direction of FIG. 1 . And, the second direction means a direction orthogonal to the first direction, that is, the Y-axis direction of FIG. 1 .

As shown in FIG. 1 , the display device 100 according to the first embodiment of the present invention includes a display panel 110 and a backlight unit disposed under the display panel 110 and radiating light to the display panel 110 . 120, a bottom cover 130 disposed below the backlight unit 120 and accommodating the backlight unit 120, a panel guide 140 disposed between the display panel 110 and the backlight unit 120, and the display panel (110) includes a top cover (150) disposed above.

As shown in FIG. 2 , the display panel 110 includes first and second substrates 111 and 112 facing each other.

The display panel 110 includes an active area (AA) that emits light for substantially displaying an image and a non-active area (NA) outside the display area (AA).

Also, the display panel 110 may further include a sealant (not shown) and a liquid crystal layer (not shown) disposed between the first and second substrates 111 and 112 .

The sealant is disposed in at least a portion of the non-display area NA between the first and second substrates 111 and 112 that is in contact with the edge of the display area AA. The sealing agent bonds the first and second substrates 111 and 112 together.

The liquid crystal layer is made of a liquid crystal material injected into the display area between the first and second substrates 111 and 112 bonded to each other. Here, the liquid crystal material may be aligned in a predetermined direction by an alignment layer (not shown) disposed on the first and second substrates 111 and 112 and in contact with the liquid crystal layer.

In addition, when the display panel is driven by an active matrix method, one of the first and second substrates 111 and 112 defines a plurality of pixel areas (not shown) and a thin film transistor array that independently drives each pixel area. (not shown).

Illustratively, the thin film transistor array may be included in the second substrate 112, a gate line (not shown) and a data line (not shown) disposed in a direction that crosses each other to define a plurality of pixel areas, and a plurality of It includes a plurality of thin film transistors (not shown) corresponding to the pixel area and disposed in an intersection area between a gate line and a data line. In this case, the second substrate 112 may further include a plurality of pixel electrodes (not shown) corresponding to the plurality of pixel regions and connected to the plurality of thin film transistors one-to-one.

The pixel electrode, along with a common electrode (not shown) disposed on one of the first and second substrates 111 and 112, generates a predetermined electric field corresponding to each pixel region. At this time, the light transmittance of each pixel region is controlled by tilting the liquid crystal material of the liquid crystal layer according to the electric field generated in each pixel region. Through this process, the display panel 110 displays a predetermined image.

The backlight unit 120 includes a light source unit 121 disposed under the edge of the display panel 110, a diffusion plate 122 disposed between the display panel 110 and the light source unit 121, and at least one prism sheet 123. , and a reflector 124 disposed below the light source unit 121 . And, the backlight unit 120 is accommodated in the bottom cover 130 disposed below the display panel 110 .

First, as shown in FIG. 3 , the bottom cover 130 is formed in a container shape to accommodate the backlight unit 120 .

Specifically, the bottom cover 130 includes a bottom portion 131 facing the display panel 110 and first to fourth side portions 132 , 133 , 134 , and 135 contacting edges of the bottom portion 131 . . In addition, the bottom cover 130 includes a support portion 136 extending from each of the first to fourth side portions 132, 133, 134, and 135 and an outer side portion 137 extending from the support portion 136 toward the display panel 110. may further include.

The bottom portion 131 includes a flat surface area (FS) parallel to the display panel 110 and an inclined surface area (IS) inclined toward the display panel 110 .

The plane area FS is in contact with the first side surface portion 132 where the light source unit 121 of the backlight unit 120 is disposed, and is spaced apart from the display panel 110 at uniform intervals in the vertical direction (Z-axis direction).

The inclined surface area IS extends from the flat area FS and is inclined toward the display panel 110 . Accordingly, the inclined plane area IS is spaced apart from the display panel 110 at intervals in the vertical direction (Z-axis direction) that gradually decrease as the distance from the plane area FS increases.

A reflector 124 of the backlight unit 120 is disposed on the bottom portion 131 . That is, the reflection plate 124 is formed as a thin film and then fixed to the bottom portion 131, so that it is deformed into a shape including a flat area FS and an inclined surface area IS, similar to the bottom portion 131.

Illustratively, although not shown in detail in FIGS. 1 and 2 , the reflector 124 is connected to the bottom portion through a separate fastening member (not shown) inserted into a fastening hole penetrating the reflector 124 and the bottom portion 131. (131) can be fixed.

The first side part 132 is in contact with the plane area FS of the bottom part 131, and the light source unit 121 of the backlight unit 120 is disposed.

The second side surface portion 133 faces the first side surface portion 132 and is in contact with the inclined surface area IS of the bottom surface portion 132 .

Illustratively, the pier between the bottom portion 131 and the first side portion 132 may be designated in consideration of the light emission direction of the light source unit 121 disposed on the first side portion 132 .

That is, the intersection angle between the bottom portion 131 and the first side portion 132 may be designated as an acute angle adjacent to 90 degrees so that light from the light source unit 121 is emitted in a direction toward the bottom portion 131 .

Alternatively, the intersection angle between the bottom portion 131 and the first side portion 132 may be set to an obtuse angle adjacent to 90 degrees so that light from the light source unit 121 is emitted in a direction toward the second side portion 133 . In this case, an obtuse angle adjacent to 90 degrees may correspond to a range of 90 degrees to 93 degrees.

Also, an intersection between the bottom portion 131 and the second side portion 133 may be designated in consideration of a light reflection direction by the second side portion 133 .

Illustratively, when light is to be reflected toward the bottom portion 131 by the second side portion 133, the pier between the bottom portion 131 and the second side portion 133 may be an acute angle adjacent to 90 degrees. there is.

Alternatively, when light is reflected toward the first side portion 132 by the second side portion 133, the pier between the bottom portion 131 and the second side portion 133 may be an obtuse angle adjacent to 90 degrees. .

In particular, the pier between each of the first and second side parts 132 and 133 and the bottom part 131 may be designated as 90 degrees. In this way, since light is emitted or reflected into the space between the diffusion plate 122 and the reflection plate 123, an optical path can be reduced, and thus loss of light emitted from the light source unit 121 can be minimized.

As mentioned above, in the bottom portion 131, the inclined plane area IS is spaced apart from the display panel 110 at an interval in the vertical direction that gradually decreases as the distance from the plane area FS increases. Accordingly, when the first side surface portion 131 where the light source unit 121 of the backlight unit 120 is disposed has a first height H1, the second side portion 132 has a second height smaller than the first height H1. (H2). Here, the first height H1 is set to a value greater than the width of the circuit board 1212 of the light source unit 121 of the backlight unit 120 .

The third and fourth side parts 134 and 135 connect the first and second side parts 132 and 133 . Accordingly, in each of the third and fourth side surface portions 134 and 135, the height of the portion in contact with the plane area FS of the bottom portion 131 is the first height H1, and the slope area IS of the bottom portion 131 ) and the height of the portion in contact gradually decreases from the first height H1 to the second height H2.

Further, each of the third and fourth side parts 134 and 135 is formed of an inclined surface that is slanted outward as it approaches the display panel 110 .

The support part 136 and the outer side part 137 are for disposing the diffusion plate 122 and at least one prism sheet 123 of the backlight unit 120 .

The support portion 136 is formed of a plane extending outward from each of the first to fourth side portions 132 , 133 , 134 , and 135 along a direction (XY plane in FIG. 1 ) facing the display panel 110 .

Also, the outer side portion 137 may be formed of a plane extending vertically from the support portion 136 toward the display panel 110 (Z-axis direction in FIG. 1 ).

A diffusion plate 122 of the backlight unit 120 and at least one prism sheet 123 are disposed on the support 136 . Also, the outer side surface portion 137 prevents the diffusion plate 122 and the at least one prism sheet 123 disposed on the support portion 136 from being separated.

Again, Fig. 2 will be described next.

As mentioned above, in the backlight unit 120, the light source unit 121 is disposed under the edge of the display panel 110 by being fixed to the first side portion 132 of the bottom cover 130. That is, the light source unit 121 is disposed in the non-display area NA.

Accordingly, compared to a structure in which the light source unit 121 is disposed in the display area AA, the increase rate of the overall thickness of the display device 100 due to the light source unit 121 may be reduced, thereby contributing to the thinning of the display device 100. can be advantageous

The light source unit 121 covers a plurality of light emitting devices 1211 (Light Emitting Device; LED) emitting light, a circuit board 1212 on which the plurality of light emitting devices 1211 are mounted, and a plurality of light emitting devices 1211. A lens unit 1213 is included.

The plurality of light emitting devices 1211 are disposed on the circuit board 1212 and emit light based on a driving current supplied from the circuit board 1212 .

Although not shown in detail in FIGS. 1 and 2 , the circuit board 1212 is a printed circuit board or flexible circuit board on which a plurality of light emitting elements 1211 are bonded and signal lines supplying driving current to the plurality of light emitting elements are printed. can be provided.

The lens unit 1213 may be formed of a transparent mold that diffuses point light sources generated by the plurality of light emitting elements 1211 . The lens unit 1213 may be provided in a dot shape corresponding to the number of light emitting elements 1211 . Alternatively, the lens unit 1213 may be provided in a line shape corresponding to the plurality of light emitting elements 1211 .

In addition, the plurality of light emitting devices 1211 may be disposed between the grooves of the circuit board 1212 and the lens unit 1213 .

The circuit board 1212 may be disposed on the first side surface 131 of the bottom cover 130 in a state in which the plurality of light emitting devices 1211 are mounted and coupled to the lens unit 1213 . Accordingly, the light source unit 121 may be disposed below the edge of the display panel 110 corresponding to the non-display area NA. Illustratively, the circuit board 1212 may be fixed to the first side portion 131 of the bottom cover 130 in a state housed in a separate housing, or to the first side portion 131 of the bottom cover 130. It can also be fixed directly.

In addition, a panel guide 140 may be disposed between the light source unit 121 and the display panel 110 . That is, in order to prevent light from the light source unit 121 from being directly irradiated to the upper display panel 110, the panel guide 140 supporting the display panel 110 may be disposed to cover the light source unit 121. .

In this case, although not shown in FIGS. 1 and 2 , the display device 100 may further include a light blocking unit (not shown) disposed in an area of the panel guide 140 facing the light source unit 121 . Due to the light blocking portion, light leakage in the non-display area NA adjacent to the light source unit 121 may be reduced.

Each of the diffusion plate 122 and the at least one prism sheet 123 disposed on the light source unit 121 has a plane shape parallel to the display panel 110 . Also, the diffusion plate 122 and at least one prism sheet 123 are disposed on the support part 136 of the bottom cover 130 .

The diffusion plate 122 diffuses light directed toward the display panel 110 .

The at least one prism sheet 123 condenses light toward the display panel 110 into the display area AA of the display panel 110 .

The reflector 124 is fixed on the bottom part 131 of the bottom cover 130, so that it is disposed under the light source part 121 and faces the diffuser plate 122. Similar to the bottom portion 131 of the bottom cover 130, the reflector 124 includes a plane area FS and an inclined surface area IS.

The reflector 124 reflects light emitted from the light source unit 121 and scattered between the reflector 124 and the diffuser plate 122 toward the display panel 110 . In addition, since the reflector 124 is made of a white film, reflection, scattering, and light guiding of light can be induced, and thus, a defect in which light is concentrated in a specific area by the reflector 124 can be prevented.

The panel guide 140 is disposed on the backlight unit 120 stored in the bottom cover 130 in which the backlight unit 120 is stored. The panel guide 140 has a frame shape corresponding to the non-display area NA of the display panel 110 . The panel guide 140 supports the display panel 110 .

That is, the display panel 110 is disposed on the backlight unit 120 accommodated in the bottom cover 130 by being fixed on the panel guide 140 .

The top cover 150 includes an upper surface covering the edge area of the display panel 110, that is, the non-display area NA, and a side surface covering the outside of the panel guide 150. The top cover 150 is coupled to the panel guide 140 and is fastened to the bottom cover 130 through the panel guide 140 .

According to the first embodiment, light emitted from the light source unit 121 is guided through an empty space between the reflector 124 and the diffuser plate 122 . The guided light is reflected by the reflector 124 , passes through the diffuser plate 122 and at least one prism sheet 123 , and is radiated onto the display panel 110 .

And, the bottom cover 130 includes a bottom portion 131 having a shape including a plane area FS and an inclined surface area IS. And, as the reflector 124 that reflects light from the light source unit 121 toward the display panel 110 is disposed on the bottom portion 131, similar to the bottom portion 131, the flat area FS and the inclined surface area ( IS) to be included.

Accordingly, since the inclined surface area IS of the reflector 124 is closer to the diffuser plate 122 than the flat surface area FS of the reflector 124, the inclined surface area IS of the reflector 124 and the diffuser plate 122 A length of a path through which light travels in the space between is shorter than a path through which light travels through a space between the plane area FS of the reflector 124 and the diffusion plate 122 . Therefore, the effect of the separation distance from the light source unit 121 on the luminance of each area of the display area AA may be insignificant.

Therefore, according to the first embodiment, even if the backlight unit 120 does not include a light guide plate for converting light from the light source unit 121 into a surface light source corresponding to the display area AA, the flat area FS and the inclined surface area A surface light source corresponding to the display area AA can be supplied to the display panel 110 due to the reflector 124 disposed on the bottom portion 131 of the bottom cover 130 having a shape including (IS). there is.

In this way, since the light guide plate of the backlight unit 120 can be removed, the light weight characteristics of the display device 100 can be improved. In addition, as the backlight unit 120 including the light source unit 121 disposed in the non-display area NA is provided, thinning characteristics of the display device 100 may be improved.

Meanwhile, as shown in FIG. 4 , the third and fourth side parts 134 and 135 of the bottom cover 130 according to the first embodiment of the present invention are inclined toward the outside as they are closer to the display panel 110. It consists of an inclined slope. Illustratively, the pier between each of the third and fourth side parts 134 and 135 and the bottom part 131 may be an obtuse angle of 100 degrees or more.

Accordingly, as indicated by the dotted arrows in FIG. 4, the light emitted from the light source unit (121 in FIG. 1) to the empty space between the diffusion plate 122 and the reflector 124 is directed toward the third and fourth side surfaces 134 and 135. ) is reflected in an oblique direction toward the diffuser plate 122.

That is, since the light is reflected not in a vertical direction but in an oblique direction by the third and fourth side surfaces 134 and 135, the third and fourth side surfaces 134 and 135 of the display area AA The amount of light irradiated to an adjacent edge area of AA (EAA) may be smaller than that of other adjacent areas. As a result, some of the edge areas EAA are displayed darker than other areas around them, and thus, there is a problem in that the display device 100 is recognized as having poor image quality.

Accordingly, the second embodiment of the present invention can improve image quality defects in which the edge area EAA of the display area AA is displayed darker than the surroundings while accommodating the backlight unit 120 that does not include the light guide plate. A bottom cover and a display device including the same are provided.

5 is an exploded perspective view showing a display device according to a second embodiment of the present invention. 6 is a perspective view showing the bottom cover of FIG. 5; FIG. 7 is a cross-sectional view of the display device of FIG. 5 in a second direction.

As shown in FIG. 5, in the display device 100' according to the second embodiment, the angles of the third and fourth side parts 133' and 134' of the bottom cover 130' with respect to the bottom part 131 A point including a reflection surface area (RSA) in a right angle range, and the first reflector 124 and the third and fourth side parts 133' and 134' disposed on the bottom part 131, respectively It is the same as the first embodiment shown in FIGS. 1 and 2, except for further including a second reflector 160 disposed on the reflective area RSA.

That is, the display device 100' according to the second embodiment is disposed under the display panel 100 and includes a light source unit 121, a diffusion plate 122, at least one prism sheet 123 and A backlight unit 120 including a first reflector 124, a bottom cover 130' disposed under the backlight unit 120 and accommodating the backlight unit 120, a display panel 110, and a backlight unit 120 The reflective areas RSA of the third and fourth side parts 134' and 135' of the panel guide 140 disposed therebetween, the top cover 150 and the bottom cover 130' disposed on the display panel 110, respectively. ) It includes a second reflector 160 disposed on.

As shown in FIG. 6 , the bottom cover 130' according to the second embodiment includes a bottom portion 131 facing the display panel 110 and first to fourth side portions contacting edges of the bottom portion 131. (132, 133, 134', 135'), the support part 136 extending from each of the first to fourth side parts 132, 133, 134', and 135' and extending from the support part 136 toward the display panel 110. It includes an outer side portion 137 to be.

The bottom portion 131 is in contact with the first side surface portion 132 where the light source unit 121 of the backlight unit 120 is disposed and is spaced apart from the display panel 110 at uniform intervals in the vertical direction (Z-axis direction) ( FS) and an inclined surface area IS that extends from the flat area FS and is spaced apart from the display panel 110 at intervals in the vertical direction (Z-axis direction) that gradually decrease as the distance from the flat area FS increases.

A first reflector 124 of the backlight unit 120 is disposed on the bottom portion 131 . Here, the first reflector 124, as in the first embodiment, may be made of a white film.

The first side part 132 is mounted with the light source part 121 of the backlight unit 120 and is in contact with the plane area FS of the bottom part 131 and has a first height H1.

The second side portion 133 faces the first side portion 132 and is in contact with the slope area IS of the bottom portion 132 and has a second height H2 smaller than the first height H1.

In this way, since the bottom part 131 and the first and second side parts 132 and 133 of the bottom cover 130' according to the second embodiment are the same as those of the first embodiment, duplicate descriptions will be omitted below.

The third and fourth side parts 134' and 135' connect the first and second side parts 132 and 133.

As shown in FIG. 7, each of the third and fourth side surfaces 134' and 135' has a reflective area RSA whose angle with respect to the bottom portion 131 is in the range of a right angle, the reflective area RSA and the bottom portion ( 131) and an extension surface area (ESA) connecting between the reflective area RSA and the support 136.

Here, the orthogonal range can be regarded as 90 degrees and 90 degrees and includes approximations of 90 degrees greater than 90 degrees. Illustratively, the right angle range may be 90 degrees to 93 degrees.

An extended surface of the reflective area RSA is a surface perpendicular to the bottom portion 131 . Accordingly, the reflective areas RSA of the third and fourth side parts 134' and 135' face each other.

The bending area BSA has a curved shape connecting between the bottom portion 131 and the reflective area RSA. That is, when the bottom cover 130' is prepared through a bending process of a cut metal plate (not shown), the third and fourth side parts 134' and 135' are perpendicular to the bottom part 131. In order to include the reflective area RSA, the bending area BSA, which is an area where the metal sheet is bent, may also be included. Accordingly, when the bottom cover 130' is not prepared in a bending process of the metal plate, the third and fourth side parts 134' and 135' may not include the bending area BSA.

The extension area ESA is an area connecting the reflective area RSA and the support 136 . An inclined angle of the extension area ESA with respect to the bottom portion 131 may be an obtuse angle greater than a right angle range. Illustratively, the angle at which the extension area ESA is inclined with respect to the bottom portion 131 may exceed a right angle range and be less than 180 degrees.

In this way, the third and fourth side parts 134' and 135' of the bottom cover 130' according to the second embodiment have an inclined angle of 90 degrees and 90 degrees greater than 90 degrees with respect to the bottom part 131. It is a form that includes a reflective area (RSA), which is a rectangular range including approximation values.

Further, the display device 100' according to the second embodiment includes a second reflector 160 disposed in the reflective area RSA of each of the third and fourth side parts 134' and 135' and made of a metallic material. do. Illustratively, the second reflector 160 may be a silver (Ag) reflector.

As described above, between the diffuser plate 122 and the first reflector 124 is formed by the second reflector 160 disposed in the reflection area RSA of each of the third and fourth side surfaces 134' and 135' facing each other. Since the light guided in the empty space of is reflected in the opposite direction and re-incident to the empty space between the diffusion plate 122 and the first reflector 124, light loss can be reduced.

Further, according to the first embodiment, as the light is reflected in an oblique direction rather than a vertical direction by the third and fourth side parts 134 and 135, the third and fourth side parts 134 and 135 An image quality defect in which the edge area EAA adjacent to is displayed darkly may easily occur.

On the other hand, according to the second embodiment, the third and fourth side parts 134' and 135' each include a reflective area RSA perpendicular to the bottom part 131, and are disposed in the reflective area RSA. Light is reflected in a direction parallel to the bottom surface portion 131 by the second reflector 160 . Accordingly, since the light reflected by the first reflector 124 may be uniformly irradiated throughout the display area AA, an area displayed darker than other areas around it may not be generated, so that the display device 100' Poor picture quality can be improved.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible within the scope of the technical spirit of the present invention. Conventionally in the art to which the present invention belongs It will be clear to those who have knowledge of

100, 100': display device
110: display panel 120: backlight unit
121: light source unit 122: diffusion plate
123: prism sheet 124: reflector, first reflector
130: bottom cover 140: panel guide
150: top cover 131: bottom part
132, 133: first and second side parts
134, 134': third side part
135, 135': fourth side part
136: support part 137: outer side part
FS: plane area IS: slope area
RSA: reflective area BSA: bending area
ESA: extended area

Claims (11)

In the bottom cover for accommodating an edge type backlight unit disposed under the display panel and having a structure in which the light guide plate is removed,
A planar area facing the display panel and spaced apart from the display panel at uniform vertical intervals, and a planar area extending from the flat area and spaced apart from the display panel at vertical intervals that gradually decrease as the distance from the flat area increases. a bottom portion including an inclined surface area;
a first side portion in contact with the flat area of the bottom portion and having a light source unit of the backlight unit disposed thereon;
a second side surface facing the first side surface and contacting the inclined surface area of the bottom surface; and
Third and fourth side parts each including a reflective area in which the angle with respect to the bottom part is 90 degrees and a right angle range including approximate values of 90 degrees greater than 90 degrees, and connecting between the first and second side parts and facing each other; include,
A first reflector is disposed on the bottom portion,
A second reflector is disposed in each of the reflection areas of the third and fourth side surfaces;
The bottom cover wherein the first reflector and the second reflector are made of different materials.
According to claim 1,
The second reflector is a bottom cover made of a metal material.
According to claim 1,
The first reflector is a bottom cover made of a white film.
According to claim 1,
The second reflector has a bottom cover having an inclined area on the inclined surface area of the bottom portion.
According to claim 1,
Each of the third and fourth side parts
The bottom cover further includes a bending area in a curved shape connecting between the bottom portion and the reflective area.
According to claim 1,
A support portion extending from each of the first to fourth side portions, facing the display panel, and supporting an edge of the optical sheet of the backlight unit;
Each of the third and fourth side surfaces further includes an extension area connecting the reflective area and the support portion and having an angle greater than the right angle range with respect to the bottom surface portion.
display panel;
a light source unit disposed under the display panel, radiating light toward the display panel, disposed under an edge of the display panel, a first reflector facing the display panel and disposed under the light source unit, the light source unit, and the display panel; an edge-type backlight unit including at least one optical sheet disposed therebetween and having a structure in which the light guide plate is removed; and
A bottom cover disposed under the backlight unit and accommodating the backlight unit;
The bottom cover,
A planar area facing the display panel and spaced apart from the display panel at uniform vertical intervals, and a planar area extending from the flat area and spaced apart from the display panel at vertical intervals that gradually decrease as the distance from the flat area increases. a bottom portion including an inclined surface area and on which the first reflector is disposed;
a first side part in contact with the plane area of the bottom part and having the light source part disposed thereon;
a second side portion facing the first side portion and contacting the inclined surface area of the base portion; and
Third and fourth side parts each including a reflective area in which the angle with respect to the bottom part is 90 degrees and a right angle range including approximate values of 90 degrees greater than 90 degrees, and connecting between the first and second side parts and facing each other; include,
A second reflector is disposed in each of the reflection areas of the third and fourth side surfaces;
The first reflector and the second reflector are made of different materials.
According to claim 7,
The second reflector is a display device made of a metal material.
According to claim 7,
The display device of claim 1 , wherein the second reflector has an inclined area on the inclined surface area of the bottom portion.
According to claim 7,
The bottom cover further includes a support part extending from each of the first to fourth side parts, facing the display panel, and supporting an edge of the optical sheet of the backlight unit,
Each of the third and fourth side parts
an extension area connecting the reflective area and the support portion and having an angle greater than the right angle range with respect to the bottom portion; and
The display device further includes a bending area in a curved shape connecting between the bottom portion and the reflective area.
According to claim 7,
a panel guide supporting an edge of the display panel; and
and a top cover disposed on the display panel, covering an edge of the display panel, and fastened to the bottom cover through the panel guide.

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