KR20120065110A - Backlight unit - Google Patents

Abstract

The present invention relates to a backlight unit capable of being lightweight, and includes a bottom plate, an optical sheet disposed on the bottom plate, a light source array module disposed on one side of the bottom plate, and including at least one light source, and a side of the bottom plate. A first segment extending upward from the bottom plate to fix the optical sheet, a second segment arranged side by side at a predetermined distance from the first segment to fix the light source array module, and the first segment and the second segment It may include a fixing portion that is connected to the third segment for fixing the display panel and disposed around the bottom plate.

Description

Backlight unit

The embodiment relates to a backlight unit that can be reduced in weight.

In general, typical large display devices include liquid crystal displays (LCDs) and plasma display panels (PDPs).

Unlike the self-luminous PDP, an LCD requires a separate backlight unit due to the absence of its own light emitting device.

The backlight unit used in LCD is classified into an edge type backlight unit and a direct type backlight unit according to the position of the light source. In the edge type, the light source is disposed on the left and right sides or the top and bottom sides of the LCD panel and the light guide plate is used. Since the light is evenly distributed on the front surface, the light is uniform and the panel thickness can be made ultra thin.

The direct method is a technology that is usually used for displays of 20 inches or more. Since a plurality of light sources are disposed under the panel, it has an advantage of superior light efficiency compared to the edge method, and is mainly used for large displays requiring high brightness.

CCFL (Cold Cathode Fluorescent Lamp) was used as the light source of the existing edge type or direct type backlight unit.

However, since the CCFL-based backlight unit is always powered by the CCFL, a considerable amount of power is consumed, and the problems of environmental pollution due to the addition of about 70% color reproduction rate and mercury are pointed out as disadvantages.

As a substitute for solving the above problems, research on a backlight unit using an LED (Light Emitting Diode) has been actively conducted.

When the LED is used as a backlight unit, the LED array can be locally turned on and off, which can drastically reduce power consumption. For RGB LED, it exceeds 100% of the NTSC (National Television System Committee) color reproduction range specification. To provide consumers with more vivid picture quality.

In addition, the LED produced by the semiconductor process is characterized by harmless to the environment.

LCD products employing LEDs with the above advantages are being released one after another. However, since the driving mechanism is different from the existing CCFL light source, driving drivers and PCB substrates are expensive.

Therefore, the LED backlight unit is still applied only to expensive LCD products.

The embodiment improves the structure of the lower cover to remove some components, such as plastic molds, thereby providing a backlight unit that can simplify the structure and reduce the weight.

An embodiment is a backlight unit for providing light to a display panel, comprising: a bottom plate, an optical sheet disposed on the bottom plate, a light source array module including at least one light source disposed on one side of the bottom plate; A first segment extending from a side surface of the bottom plate to an upper direction of the bottom plate to fix the optical sheet; a second segment arranged side by side at a predetermined distance from the first segment to fix the light source array module; The display device may include a fixing part disposed around the bottom plate and including a third segment connecting the segment to the second segment and fixing the display panel.

Here, the first segment of the fixture is bent in a direction perpendicular to the top surface of the bottom plate, the second segment of the fixture is arranged parallel to the first segment, and the third segment of the fixture is bottom The end of the first segment and the end of the second segment can be connected in a direction parallel to the upper surface of the plate.

In addition, a plurality of holes may be formed in the first segment of the fixing part so that light emitted from the light source is transmitted, and each hole of the first segment may be disposed to correspond to each light source of the light source array module.

Subsequently, the third segment of the fixing part may include a panel support part extending in an inward direction in which the bottom plate is disposed from the end of the third segment to support the display panel.

Here, the panel support may be composed of one single body disposed along the end of the third segment or a plurality of multi-body disposed at regular intervals along the end of the third segment. have.

In addition, the panel support part may include a panel protective sheet formed on a surface to which the display panel is in contact.

Subsequently, the first segment of the fixing part may include at least one protrusion protruding in a direction perpendicular to the upper surface of the bottom plate so as to fix the reflective seat.

Next, a thermal sheet may be further disposed between the light source array module and the second segment.

In addition, the optical sheet may include at least one hole in the edge region to be fixed to the first segment of the fixing portion.

The fixing portion extends from a pair of first side surfaces of the bottom plate that face each other in the X-axis direction, extends from a pair of second side surfaces that face each other in the Y-axis direction, and extends in the X-axis direction. The fixing portion and the fixing portion extending in the Y-axis direction may be spaced apart from each other in the corner region of the bottom plate.

Here, the interval between the fixing portion extending in the X-axis direction and the fixing portion extending in the Y-axis direction may be connected by a corner buffer that protects the edge of the display panel.

Embodiments can simplify the structure of the overall backlight by disposing some fixing parts for fixing the light source, the display panel and the optical sheet around the bottom plate, and removing some components such as the conventional plastic mold. The weight of the can be minimized.

1 is an exploded view showing a backlight unit according to an embodiment
FIG. 2 shows the lower cover of FIG. 1; FIG.
3 is a cross-sectional view showing in detail the fixing part of FIG.
4a and 4b show the hole cross-sectional shape of FIG.
5A and 5B are front views showing holes corresponding to light sources
6A and 6B are perspective views showing the panel support
7 is a view illustrating a light source array module fixed to a fixing unit;
8 is a view showing an optical sheet fixed to the fixing portion
9 is a sectional view showing the components of FIG. 1 fixed by a lower cover;
10 shows a panel protective sheet;
11 shows a corner buffer
12 is a view illustrating a display panel fastened to a lower cover;

Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings.

In the description of the embodiments, it is to be understood that each layer (film), region, pattern or structure is formed "on" or "under" a substrate, each layer The terms " on "and " under " encompass both being formed" directly "or" indirectly " In addition, the criteria for the top or bottom of each layer will be described with reference to the drawings.

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. In addition, the size of each component does not necessarily reflect the actual size.

1 is an exploded view illustrating a backlight unit according to an embodiment.

As shown in FIG. 1, the backlight unit may include a lower cover 100, a light source array module 200, and an optical sheet 500.

In addition, the reflective sheet 300 may further include the light guide plate 400, and in addition, the panel protective sheet 700 and the corner buffer 600 may be further included.

As such, the backlight unit may be coupled to the display panel 800 by the upper cover 900.

Here, the lower cover 100 may also serve to support and fix the optical sheet 500, the light source array module 200, and the display panel 800.

In this embodiment, by removing some components such as a plastic mold and improving the structure of the lower cover, it is possible to manufacture a backlight unit that can simplify the structure and reduce the weight.

FIG. 2 is a view showing the lower cover of FIG. 1.

As shown in FIG. 2, the lower cover 100 may include a bottom plate 110 and a fixing part 120.

Here, the bottom plate 110 may be a lower surface of the lower cover 100, and the fixing part 120 may extend from the side of the bottom plate 110 and be disposed around the bottom plate 110.

In some cases, the central region of the bottom plate 110 may be formed to protrude upward.

The reason is that a heat sink (not shown) or the like for dissipating heat may be disposed in the bottom surface of the bottom plate 110 protruding upward.

In addition, the fixing part 120 disposed around the bottom plate 110 may serve to support and fix the optical sheet 500, the light source array module 200, and the display panel 800. It may have a "shaped bending structure.

Here, the fixing part 120 may extend from a pair of side surfaces facing each other in the X-axis direction among the four sides of the bottom plate 110 and may extend from a pair of side surfaces facing each other in the Y-axis direction.

In this case, the fixing part 120 extending in the X-axis direction and the fixing part 120 extending in the Y-axis direction may be spaced apart from each other by a predetermined distance from the corner region of the bottom plate 110.

3 is a cross-sectional view showing in detail the fixing part of FIG.

As shown in FIG. 3, the fixing part 120 may include first, second, and third segments 120a, 120b, and 120c.

Here, the first segment 120a may extend from the side of the bottom plate 110 in the upper direction of the bottom plate 110 to fix the optical sheet 500.

In addition, the second segment 120b may be arranged side by side at a predetermined distance from the first segment 120a to fix the light source array module 200, and the third segment 120c may include the first segment 120a and the second segment. The segment 120b may be connected and the display panel 800 may be fixed.

 In this case, the first segment 120a is formed to be bent in a direction perpendicular to the upper surface of the bottom plate 110, but is not limited thereto.

That is, the first segment 120a may be bent at an angle with respect to the upper surface of the bottom plate 110 and bent upward.

Accordingly, the first segment 120a may be inclined about 45 degrees to 135 degrees with respect to the upper surface of the bottom plate 110 and bend upward.

In addition, the second segment 120b may be disposed in parallel with the first segment 120a, but is not limited thereto.

For example, although the second segment 120b is formed to face the first segment 120a, the second segment 120b may be disposed to be inclined in the direction of the first segment 120a without being parallel to the first segment 120a.

Next, the third segment 120c may connect the end of the first segment 120a and the end of the second segment 120b to each other in a direction parallel to the upper surface of the bottom plate 110.

Meanwhile, a plurality of holes 130 may be formed in the first segment 120a of the fixing part 120 to transmit light emitted from the light source.

4A and 4B are views showing the hole cross-sectional shape of FIG. 3, and FIG. 4A is a view in which the side of the hole 130 is perpendicular to the surface of the first segment 120a, and FIG. 4B is a hole ( 130 is a view having a shape inclined with respect to the surface of the first segment 120a.

As shown in FIG. 4A, a hole 130 is formed in the first segment 120a, and the light source array module 200 may be attached on the second segment 120b at a position corresponding to the hole 130. have.

Here, the light emitted from the light source 210 of the light source array module 200 may be transmitted into the bottom plate 110 through the hole 130 of the first segment 120a.

The hole 130 may be formed vertically with respect to the surface of the first segment 120a, but the side of the hole 130 may be formed with respect to the surface of the first segment 120a so that light is smoothly diffused and transmitted. It may be formed to be inclined.

As shown in FIG. 4B, the cross-sectional shape of the hole 130 may have a trapezoidal shape.

That is, the inner diameter of the hole 130 may be formed to gradually increase as the distance from the light source 210.

In addition, each hole 130 of the first segment 120a may be disposed to correspond to each light source 210 of the light source array module 200.

5A and 5B are front views illustrating a hole corresponding to a light source, FIG. 5A is a view in which a light source and a hole are matched one-to-one, and FIG. 5B is a view in which a plurality of light sources are matched to one hole.

As illustrated in FIG. 5A, the hole 130 formed in the first segment 120a may be formed to have a one-to-one correspondence with the light source 210 arranged in the second segment 120b.

As shown in FIG. 5B, one hole 130 formed in the first segment 120a may be formed to match the plurality of light sources 210 arranged in the second segment 120b.

Here, the shape of the hole 130 may be formed in various shapes such as polygons, circles, ovals, as well as quadrangle.

Meanwhile, as shown in FIG. 3, the third segment 120c of the fixing part 120 extends from the end of the third segment 120c in the inward direction in which the bottom plate 110 is disposed so as to support the display panel. The panel support 140 may be included.

Here, the panel support 140 may be composed of one single body or may be composed of a plurality of multi-bodies.

6A and 6B are perspective views showing the panel support, wherein FIG. 6A is a panel support composed of one unitary body, and FIG. 6B is a panel support composed of a plurality of bodies.

As shown in FIG. 6A, the panel support 140 may be composed of one unit disposed along the end of the third segment 120c.

In this case, the panel support 140 formed of a single body may be formed to extend from the third segment 120c, and in some cases, may be extended from the first segment 120a.

And, as shown in Figure 6b, the panel support portion 140 may be composed of a plurality of plural bodies disposed at regular intervals along the end of the third segment (120c).

Here, the panel support part 140 formed of a plurality of bodies may be bent from the first segment 120a or may be formed to extend from the third segment 120c in some cases.

If the panel supporter 140 is formed to be bent from the first segment 120a, the holes 130 are formed together in the first segment 120a, so that an additional hole 130 is not formed. do.

However, when the panel support 140 is formed to extend from the third segment 120c, a process of forming an additional hole 130 in the first segment 120a should be performed.

Meanwhile, the light source array module 200 may be positioned between the first segment 120a and the second segment 120b of the fixing part 120 and may be fixed by the second segment 120b.

Here, the arrangement of the light source array module 200 may vary according to the distance between the first segment 120a and the second segment 120b or the thickness of the first or second segment 120a or 120b.

7 is a view illustrating a light source array module fixed to the fixing unit.

As illustrated in FIG. 7, the light source array module 200 may be positioned between the first and second segments 120a and 120b of the fixing part and may be fixed on the second segment 120b.

Here, in the light source array module 200, at least one light source 210 may be arranged on the substrate 220 and attached to the second segment 120b by a thermal sheet 230.

In this case, the thermal sheet 230 is formed between the light source array module 200 and the second segment 120b to fix the light source array module 200, and serves as a passage for dissipating heat generated from the light source 210 to the outside. Can be performed.

That is, heat generated by the light source 210 may be emitted to the outside via the second segment 120b of the substrate 220, the thermal sheet 230, and the fixing part 120.

In addition, an interval A between the light source 210 and the first segment 120a of the light source array module 200 facing each other may be about 0 to 0.1 mm.

If the distance A between the light source 210 and the first segment 120a of the light source array module 200 is about 0.1 mm or more, the loss of light generated from the light source 210 may increase.

In addition, it is preferable that the spacing B between the first and second segments 120a and 120b facing each other is four times the thickness C of the second segment 120b.

If the second segment 120b thickness C is greater than four times, the overall backlight size is not suitable for weight reduction, and if the second segment 120b thickness C is less than four times, the stability of the lower cover may be deteriorated. Because there is.

In some cases, at least one of the first, second, and third segments 120a, 120b, and 120c of the fixing part 120 may be formed differently from the thickness of the bottom plate 110.

In another embodiment, the first, second, and third segments 120a, 120b, and 120c of the fixing part 120 may be formed to have the same thickness as the bottom plate 110.

On the other hand, the optical sheet 500 may be disposed on the bottom plate 110, the optical sheet 500 is fixed to the first segment (120a) of the fixing part 120, at least one hole in the edge region thereof This can be formed.

8 is a view illustrating an optical sheet fixed to the fixing unit.

As shown in FIG. 8, the fixing part 120 extends from a pair of side surfaces facing each other in the X-axis direction among the four sides of the bottom plate 110, and from a pair of side surfaces facing each other in the Y-axis direction. Can be extended.

Here, the fixing part 120 extending in the X-axis direction and the fixing part 120 extending in the Y-axis direction may be disposed at a predetermined distance from the corner region of the bottom plate 110.

In addition, at least one protrusion 170 protruding in a direction perpendicular to the upper surface of the bottom plate 110 may be formed in the first segment 120a of the fixing part 120 to fix the reflecting seat 500. Can be.

Here, the third segment 120c connected to the end of the first segment 120a may have a hole 520 formed around the protrusion 170.

In addition, a hole 510 may be formed in the edge region of the optical sheet 500 to couple with the first segment 120a of the fixing part 120.

Accordingly, the holes 510 of the optical sheet 500 and the protrusions 170 of the fixing part 120 are disposed to correspond to each other, and the protrusions 170 of the fixing part 120 are disposed in the holes 510 of the optical sheet 500. ) Can be combined by insertion.

In some cases, the protrusion 170 of the fixing part 120 may be formed only in the fixing part 120 extending in the Y-axis direction, and may not be formed in the fixing part 120 extending in the X-axis direction.

Alternatively, the protrusions 170 of the fixing part 120 may be formed in the entire fixing part except the fixing part in which the light source array module 200 is disposed.

That is, the protrusions 170 may be formed on all or part of the remaining sides except for only the side of the bottom plate 110 on which the light source array module 200 is disposed.

In this case, it will be obvious that the hole 510 of the optical sheet 500 is formed to correspond to the protrusion 170 of the fixing part 120.

As such, the lower cover 100 may be configured to support or fix the reflective sheet 300, the light guide plate 400, the optical sheet 500, the light source array module 200, and the display panel 800.

9 is a cross-sectional view showing the components of FIG. 1 fixed by the lower cover.

As shown in FIG. 9, the bottom plate 110 of the lower cover fixes the reflective sheet 300 and the light guide plate 400, and the protrusion 170 of the first segment 120a of the fixing part 120 is optical. The sheet 500 may be fixed.

Subsequently, the second segment 120b of the fixing part 120 fixes the light source array module 200 by the thermal sheet 230, and extends the panel support part extending from the third segment 120c of the fixing part 120. 140 may fix the display panel 800.

Here, the panel supporter 140 may damage the display panel 800 when the display panel 800 is in direct contact with the panel supporter 140. May be further formed.

10 is a view showing a panel protective sheet.

As shown in FIG. 10, in order to prevent damage to the display panel 800, the panel protection sheet 150 may be formed on the surface of the panel support 140.

Here, the panel protection sheet 150 may be made of a soft material such as silicon, and may be formed in the contact area between the panel support 140 and the display panel 800.

The panel protective sheet 150 may be formed on the entire surface of the panel support 140, but in some cases, may be formed only on a part of the surface.

In addition, in order to protect the display panel 800, a corner buffer 160 may be further formed between the fixing portion extending in the X-axis direction and the fixing portion extending in the Y-axis direction.

11 illustrates a corner buffer.

As shown in FIG. 11, the corner buffer 160 is formed on the panel protective sheet 150 to connect between the fixing part 120 extending in the X-axis direction and the fixing part 120 extending in the Y-axis direction. Can be.

Here, the corner buffer 160 is disposed in the corner region of the lower cover, thereby protecting the corner of the display panel 800.

12 is a view illustrating a display panel fastened to a lower cover.

As shown in FIG. 12, when the display panel 800 is fastened to the lower cover, the edge area of the display panel 800 is fragile and can be easily damaged by an external impact.

Therefore, the corner buffer 160 is disposed in the corner area of the lower cover, thereby preventing the display panel 800 from being damaged.

As described above, the embodiment is configured to secure the light source, the display panel, and the optical sheet by arranging the fixing portion around the bottom plate, thus eliminating some components such as the existing plastic mold, thereby reducing the overall backlight structure. It can simplify and minimize the weight of the backlight.

Features, structures, effects, and the like described in the above embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

Claims (20)

In the backlight unit for providing light to the display panel,
Bottom plate;
An optical sheet disposed on the bottom plate;
A light source array module disposed on one side of the bottom plate and including at least one light source; And,
A first segment extending from a side surface of the bottom plate in an upper direction of the bottom plate to fix the optical sheet; and a second segment arranged side by side at a predetermined distance from the first segment to fix the light source array module; And a third segment connecting the first segment and the second segment and fixing the display panel, the fixing unit being disposed around the bottom plate. The backlight unit of claim 1, wherein the first segment of the fixing part is bent in a direction perpendicular to an upper surface of the bottom plate. The backlight unit of claim 1, wherein the second segment of the fixing part is disposed in parallel with the first segment. The backlight unit of claim 1, wherein the third segment of the fixing portion connects an end of the first segment to an end of the second segment in a direction parallel to an upper surface of the bottom plate. The backlight unit of claim 1, wherein a plurality of holes are formed in the first segment of the fixing part so that light emitted from the light source is transmitted. The backlight unit of claim 5, wherein each hole of the first segment is disposed to correspond to each light source of the light source array module. The backlight unit of claim 1, wherein the third segment of the fixing part includes a panel support extending from an end of the third segment in an inward direction in which the bottom plate is disposed so as to support the display panel. 8. The panel support of claim 7, wherein the panel support is composed of one single body disposed along the end of the third segment, or the plurality of multi-units arranged at regular intervals along the end of the third segment. -backlight unit). The backlight unit of claim 7, wherein the panel support part comprises a panel protective sheet formed on a surface on which the display panel is in contact. The backlight unit of claim 1, wherein the first segment of the fixing part includes at least one protrusion protruding in a direction perpendicular to an upper surface of the bottom plate to fix the reflective seat. The backlight unit of claim 10, wherein the third segment connected to the end of the first segment comprises a hole formed along the periphery of the protrusion. The backlight unit of claim 1, wherein a thermal sheet is disposed between the light source array module and the second segment. The backlight unit of claim 1, wherein a distance between the light source and the first segment of the light source array module facing each other is 0 to 0.1 mm. The backlight unit of claim 1, wherein an interval between the first and second segments facing each other is four times the thickness of the second segment. The backlight unit of claim 1, wherein at least one of the first, second, and third segments of the fixing part is different from a thickness of the bottom plate. The backlight unit of claim 1, wherein the first, second and third segments of the fixing part are equal to the thickness of the bottom plate. The method of claim 1,
A reflective sheet disposed on the bottom plate;
And a light guide plate disposed on the reflective sheet to guide light generated from the light source. The backlight unit of claim 1, wherein the optical sheet includes at least one hole in an edge area of the optical sheet to be fixed to the first segment of the fixing part. The method of claim 1, wherein the fixing unit,
Of the four side surfaces of the bottom plate, extending from a pair of sides facing each other in the X-axis direction, extending from a pair of sides facing each other in the Y-axis direction, the fixing portion and the Y-axis extending in the X-axis direction And a fixing part extending in a direction to be spaced apart from the corner area of the bottom plate by a predetermined distance. The backlight unit of claim 19, wherein a distance between the fixing part extending in the X-axis direction and the fixing part extending in the Y-axis direction is connected by a corner buffer that protects an edge of the display panel.

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