KR101762321B1 - backlight unit - Google Patents

Abstract

The light source array module 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, A first segment extending from the first segment and extending upwardly from the bottom plate to secure the optical sheet, a second segment disposed side by side at a distance from the first segment to secure the light source array module, And a third segment that fixes the display panel and that is disposed around the bottom plate.

Description

BACKLIGHT UNIT

The embodiment relates to a backlight unit which can be lightened.

Typically, typical large-sized display devices include a liquid crystal display (LCD), a plasma display panel (PDP), and the like.

Unlike a self-luminous PDP, a backlight unit is indispensable because of the absence of its own light emitting device.

The backlight unit used in the LCD is divided into an edge type backlight unit and a direct-type backlight unit according to the position of the light source. In the edge type, a light source is disposed on the right and left sides or upper and lower sides of the LCD panel, Since the light is uniformly distributed over the surface, uniformity of light is good and the thickness of the panel can be made very thin.

The direct-type method is generally used for a display having a size of 20 inches or more. Since the light source is disposed at a lower portion of the panel, the light efficiency is higher than that of the edge type.

CCFL (Cold Cathode Fluorescent Lamp) is used as a light source of the backlight unit of the conventional edge method or direct-down type.

However, since the backlight unit using CCFL is always supplied with power to the CCFL, a considerable amount of power is consumed, and a color reproduction ratio of about 70% as compared with CRT and environmental pollution problems caused by the addition of mercury are pointed out as disadvantages.

BACKGROUND ART [0002] As a substitute product for solving the above problem, researches on a backlight unit using an LED (Light Emitting Diode) have been actively conducted.

When the LED is used as a backlight unit, it is possible to locally turn on / off the LED array, thereby dramatically reducing power consumption. In the case of the RGB LED, the LED is over 100% of the National Television System Committee (NTSC) So that a more vivid image quality can be provided to the consumer.

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

Currently, LCD products employing LEDs having the above advantages are being marketed extensively. However, since the conventional CCFL light source is different from the driving mechanism, driving drivers and PCB substrates are expensive.

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

The embodiment provides a backlight unit capable of simplifying the structure and lightening the weight by improving the structure of the lower cover to remove some components such as a plastic mold.

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

Here, the first segment of the fixed portion is bending in a direction perpendicular to the upper surface of the bottom plate, the second segment of the fixed portion is disposed in parallel with the first segment, The end of the first segment and the end of the second segment may be connected in a direction parallel to the upper surface of the plate.

The first segment of the fixed portion may be formed with a plurality of holes so that light emitted from the light source is transmitted, and each hole of the first segment may be disposed corresponding to each light source of the light source array module.

The third segment of the securement may then include an inwardly extending panel support from 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 a single body disposed along the end of the third segment or may be composed of a plurality of multi-bodies arranged at regular intervals along the end of the third segment have.

And, the panel supporting portion may include a panel protective sheet formed on a surface to which the display panel is contacted.

The first segment of the fixture may then include at least one projection projecting in a direction perpendicular to the upper surface of the bottom plate to fix the reflector.

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

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

The fixing portion extends from a pair of first side surfaces opposed to each other in the X-axis direction among the four side surfaces of the bottom plate, extends from a pair of second side surfaces opposed to each other in the Y-axis direction, And the fixed portion extending in the Y-axis direction may be spaced apart from the edge region of the bottom plate by a predetermined distance.

Here, the gap between the fixed portion extending in the X-axis direction and the fixed portion extending in the Y-axis direction may be connected by a corner buffer for protecting the edge of the display panel.

Embodiments can simplify the overall structure of the backlight by disposing a fixing part capable of 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, Can be minimized.

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

Hereinafter, 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 above or below each layer will be described with reference to the drawings.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. Also, the size of each component does not entirely reflect the actual size.

1 is an exploded view showing 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, it may further include a reflective sheet 300 and a light guide plate 400, and may further include a panel protective sheet 700 and a corner buffer 600. [

In this manner, the backlight unit configured can be coupled with the display panel 800 by the upper cover 900.

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

This embodiment can manufacture a backlight unit that can simplify the structure and reduce the weight by removing some components such as a plastic mold and improving the structure of the lower cover.

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

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

Here, the bottom plate 110 is a lower surface of the lower cover 100, and the fixing portion 120 may extend from a side surface 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.

This is because a heat radiating plate (not shown) or the like may be disposed in the lower surface of the bottom plate 110 protruding upward to discharge heat.

The fixing part 120 disposed around the bottom plate 110 is provided with a fixing part 120 for supporting and fixing the optical sheet 500, the light source array module 200 and the display panel 800 Shaped "bending structure.

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

At this time, the fixing portions 120 extending in the X-axis direction and the fixing portions 120 extending in the Y-axis direction may be spaced apart from the edge regions of the bottom plate 110 by a predetermined distance.

3 is a cross-sectional view showing the fixing portion of FIG. 2 in detail.

As shown in FIG. 3, the fixing portion 120 may be composed of first, second, and third segments 120a, 120b, and 120c.

Here, the first segment 120a extends from the side of the bottom plate 110 to the top of the bottom plate 110 to fix the optical sheet 500.

The second segment 120b may be spaced apart from the first segment 120a by a predetermined distance so as to fix the light source array module 200 and the third segment 120c may include the first segment 120a and the second segment 120b. The segments 120b may be connected and the display panel 800 may be fixed.

 At this time, the first segment 120a is formed to bend 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 inclined at an angle to the upper surface of the bottom plate 110 and bent upward.

Accordingly, the first segment 120a can be bent upward by about 45 - 135 degrees relative to the top surface of the bottom plate 110. [

Also, the second segment 120b may be disposed parallel to the first segment 120a, but is not necessarily limited thereto.

For example, the second segment 120b is formed to face the first segment 120a, but may not be parallel to the first segment 120a but may be disposed to be inclined toward the first segment 120a.

The third segment 120c may then 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. [

A plurality of holes 130 may be formed in the first segment 120a of the fixing unit 120 so that light emitted from the light source is transmitted through the first segment 120a.

4A is a view showing a side surface of the hole 130 having a shape perpendicular to the surface of the first segment 120a and FIG. 4B is a view showing a hole 130 are inclined with respect to the surface of the first segment 120a.

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

The light emitted from the light source 210 of the light source array module 200 may be transmitted to the bottom plate 110 through the holes 130 of the first segment 120a.

The hole 130 may be formed such that the side of the hole 130 is substantially perpendicular to the surface of the first segment 120a so that the light may be diffused and transmitted smoothly, Or 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 gradually increased as the distance from the light source 210 increases.

Each of the holes 130 of the first segment 120a may be arranged to correspond to each light source 210 of the light source array module 200.

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

5A, the holes 130 formed in the first segment 120a may be formed to match the light sources 210 arranged in the second segment 120b in a one-to-one correspondence.

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

Here, the shape of the holes 130 may be various shapes such as polygonal, circular, and elliptical shapes as well as a square.

3, the third segment 120c of the fixing portion 120 extends from the end of the third segment 120c in the inward direction in which the bottom plate 110 is disposed to support the display panel (Not shown).

Here, the panel supporting unit 140 may be a single body or a multi-body.

6A and 6B are perspective views showing a panel supporting portion, wherein FIG. 6A is a panel supporting portion composed of a single body, and FIG. 6B is a panel supporting portion composed of a plurality of plural bodies.

As shown in FIG. 6A, the panel support 140 may be constructed as a single piece disposed along the end of the third segment 120c.

Here, the single panel support 140 may be formed to extend from the third segment 120c and may extend from the first segment 120a in some cases.

As shown in FIG. 6B, the panel supporting part 140 may be formed of a plurality of plural pieces arranged at regular intervals along the end of the third segment 120c.

Here, the panel support 140, which is a plural body, may be bent from the first segment 120a, or may extend from the third segment 120c as the case may be.

If the panel support 140 is formed to extend from the first segment 120a, the first segment 120a is formed with the hole 130, so that a process for forming the additional hole 130 is not necessary do.

However, if 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 may be performed.

The light source array module 200 may be positioned between the first segment 120a and the second segment 120b of the fixing unit 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 interval between the first segment 120a and the second segment 120b and the thickness of the first or second segment 120a or 120b.

7 is a view showing a light source array module fixed to a fixed portion.

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

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

At this time, 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 path for discharging the heat generated from the light source 210 to the outside Can be performed.

That is, the heat generated from the light source 210 may be emitted to the outside through the substrate 220, the thermal sheet 230, and the second segment 120b of the fixing unit 120. [

The gap A between the light source 210 and the first segment 120a of the light source array module 200 facing each other may be about 0-0.1 mm.

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

The distance B between the first and second segments 120a and 120b facing each other is preferably four times the thickness C of the second segment 120b.

If the thickness C of the second segment 120b is larger than four times, the overall backlight size becomes large and is not suitable for weight reduction. If the thickness C of the second segment 120b is less than four times, the stability of the bottom cover may deteriorate It is because.

At least one of the first, second, and third segments 120a, 120b, and 120c of the fixing unit 120 may be formed to have a thickness different from that of the bottom plate 110, as the case may be.

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

The optical sheet 500 may be disposed on the bottom plate 110 so that the optical sheet 500 is fixed to the first segment 120a of the fixing portion 120. At least one hole Can be formed.

8 is a view showing an optical sheet fixed to the fixing portion.

8, the fixing portion 120 is formed of a pair of side surfaces extending from a pair of side surfaces opposed to each other in the X-axis direction among four side surfaces of the bottom plate 110 and opposed to each other in the Y- Can be extended.

The fixed portion 120 extending in the X-axis direction and the fixed portion 120 extending in the Y-axis direction may be spaced apart from each other by a predetermined distance in an edge area of the bottom plate 110.

The first segment 120a of the fixing portion 120 is formed with at least one protrusion 170 protruding in a direction perpendicular to the upper surface of the bottom plate 110 so as to fix the reflective saucer 500 .

Here, the third segment 120c connected to the end of the first segment 120a may be formed with a hole 520 along the periphery of the projection 170. [

In addition, a hole 510 for coupling with the first segment 120a of the fixing portion 120 may be formed in the edge region of the optical sheet 500. [

The holes 510 of the optical sheet 500 and the protrusions 170 of the fixing portion 120 are disposed so as to correspond to each other and the protrusions 170 of the fixing portion 120 in the holes 510 of the optical sheet 500 Can be inserted, whereby they can be combined.

The protrusions 170 of the fixing portion 120 may be formed only in the fixing portion 120 extending in the Y axis direction and may not be formed in the fixing portion 120 extending in the X axis direction.

Alternatively, the protrusion 170 of the fixing part 120 may be formed on the entire fixing part except for the fixing part where the light source array module 200 is disposed.

That is, the protrusion 170 may be formed on all or part of the other side of the bottom plate 110 except for the side surface of the bottom plate 110 where the light source array module 200 is disposed.

In this case, it is a matter of course that the hole 510 of the optical sheet 500 is formed to correspond to the projection 170 of the fixing portion 120.

The lower cover 100 may 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.

Figure 9 is a cross-sectional view of the components of Figure 1 secured by a lower cover.

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 portion 120 is fixed to the optical The sheet 500 can be fixed.

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

Since the panel support portion 140 may cause damage to the display panel 800 when the display panel 800 is directly contacted with the panel support portion 140, May be further formed.

10 is a view showing a panel protective sheet.

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

Here, the panel protective sheet 150 may be formed of a soft material such as silicone or the like and may be formed in a 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 supporting portion 140, but it may be formed only on some surfaces in some cases.

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

11 is a view showing a corner buffer.

11, the corner buffer 160 is formed on the panel protective sheet 150 so as to connect between the fixing portion 120 extending in the X-axis direction and the fixing portion 120 extending in the Y- .

Here, since the corner buffer 160 is disposed in the corner area of the lower cover, the corner of the display panel 800 can be protected.

12 is a view showing a display panel fastened to a lower cover;

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, since the corner buffer 160 is disposed in the corner area of the lower cover, it is possible to prevent the display panel 800 from being damaged.

In this embodiment, the light source, the display panel, the optical sheet, and the like can be fixed by disposing the fixing portion around the bottom plate. Therefore, by removing some components such as the conventional plastic mold, Can be simplified, and the weight of the backlight can be minimized.

The features, structures, effects and the like described in the 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 can be combined and modified by other persons 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 embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (20)

A bottom plate disposed at a lower portion of the optical sheet and the display panel, the bottom plate being disposed on a side surface of the light source array module including at least one light source;
A fixing unit disposed around the bottom plate and fixedly supporting the optical sheet, the display panel, and the array module;
A first segment extending from a side surface of the bottom plate toward an upper side of the bottom plate to form an inner wall of the fixing portion, the first segment fixing the optical sheet;
A second segment arranged at a predetermined distance apart from the first segment to form an outer wall of the fixing portion and fixing the light source array module to an inner space formed by the first segment;
A third segment connecting the first segment and the second segment to form a top wall of the fixed portion, the third segment fixing the display panel; And
And a panel support portion extending from an end of the third segment in an inward direction in which the bottom plate is disposed to support the display panel. The method according to claim 1,
And a plurality of holes arranged corresponding to the respective light sources of the light source array module are formed in the first segment of the fixing unit so that light emitted from the light source is transmitted. 3. The method according to claim 1 or 2,
The panel support may comprise a single body disposed along an end of the third segment or a plurality of multi-bodies disposed at regular intervals along an end of the third segment Backlight unit. The method of claim 3,
Wherein the panel supporting portion includes a panel protective sheet formed on a surface to which the display panel contacts. The method of claim 3,
Wherein the first segment of the fixing portion includes at least one projection projecting in a direction perpendicular to the upper surface of the bottom plate to fix the reflecting sate; And
And the third segment includes a hole formed along the periphery of the projection. 3. The method according to claim 1 or 2,
And a thermal sheet is disposed between the light source array module and the second segment.
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