KR20190019298A - Back light unit cover bottom for big area display - Google Patents

Abstract

The present invention relates to a large area display backlight unit cover bottom wherein a panel of the backlight unit (BLU) controls a directional control of a reference setting and the light source when a driving circuit part is fixed, comprising a rectangular irregular reinforcing part having a plurality of concave part on a front surface and having a plurality of protruding parts on a rear surface, and a vertical irregular reinforcing part provided in an interior of the rectangular irregular reinforcing part and having a plurality of recessed parts on the basis of the front surface having a plurality of protruding parts on a rear surface; and a backlight unit cover bottom of the area can be manufactured with a thin thickness through a technical construction, thereby being capable of reducing a weight of the backlight unit and reducing the costs.

Description

{BACK LIGHT UNIT COVER BOTTOM FOR BIG AREA DISPLAY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-area display backlight unit cover bottom, and more particularly, to a large-area display backlight unit cover bottom which can be manufactured with a small thickness by improving rigidity through rectangular reinforcing concave-

The display is a device for displaying output electrical signal recognition and image information from an electronic device on the screen. Display is classified into direct type and projection type depending on the screen implementation method. Currently, the CRT era is short and it is being reorganized into flat panel display such as LCD, PDP, and OLED.

Among flat panel displays, LCD has characteristics of excellent voltage and low power consumption and excellent resolution. PDP has characteristics of fast response speed, wide viewing angle, and easy size, and OLED has excellent power consumption, response speed, brightness and light weight. Is short, it is difficult to enlarge it, and the production yield is low and the price is high.

The display industry is a capital-intensive industry that requires large-scale investment. Despite a short cycle of 2 to 3 years, the display industry of key components of digital appliances, computers, Mobile devices and so on.

The technical advantage of display technology threatens other products market, and the price of product is lowered due to such a competitive structure. Nevertheless, the market is characterized by continuous growth.

Recently, the display industry is showing rapid growth in line with the era of high-speed information technology, and this trend is expected to continue for a long period of time. These display devices are changing day by day, and the display market is now being formed by LCD / OLED.

In recent years, technological progress has been made in various fields in order to maintain the preemptive position of the market, which is almost enough to war against the field of display market. Up to now, a TFT-LCD (Thin Film Transistor-Liquid Crystal Display) It is mainstream.

Since a TFT-LCD does not have a self-emitting light source, a light source is necessarily required. A backlight unit (BLU) constituting a light source includes a panel in which a liquid crystal is injected between a substrate and a substrate; A driving circuit unit including a driver LSI for driving the panel and a printed circuit board (PCB) having various circuit elements; And a cover botton for setting the reference and the direction of the light source when the panel and the driving circuit are fixed.

Cover Bottom of the backlight unit is required to be made very thin in order to realize a thin display in the LCD module together with the fastening function of the main constituent unit. Also, it is required to implement the high-tech press mold technology It is an intricate technology-intensive part that needs to be integrated with production technology.

Patent Document 1 below discloses a cover bottom of a backlight device.

The cover bottom of the backlight device of Patent Document 1 is configured to change the shape of the forming portion formed on the bottom surface so as to prevent defective appearance of the backlight device caused by the forming portion, In the bottom, the bottom surface; A seating surface which is formed to be relatively high while forming a step with the bottom surface; And an inclined surface connecting the seating surface and the bottom surface, wherein the inclined surface is formed of a plurality of inclined surfaces having different horizontal inclination angles.

The following Patent Document 2 discloses a cover bottom of a direct-facing backlight assembly for a large-area liquid crystal display device.

The cover bottom of the direct-type backlight assembly for a large-area liquid crystal display device of Patent Document 2 is a cold-cathode fluorescent lamp in which a front surface is opened, a reflection plate in the form of a silver or white sheet is disposed along the inner surface, A cover bottom of a direct-type backlight assembly for storing and supporting a diffusing plate for covering a negative-polarity fluorescent lamp in front of the direct-type backlight assembly for a large-area liquid crystal display device and having a predetermined radiant heat-increasing process for raising the radiation rate to an upper- .

Korean Registered Patent No. 10-1424627 (registered on July 23, 2014) Korean Patent Publication No. 10-2005-0068796 (published on July 05, 2005)

As described above, in order to realize a thin display in an LCD module including a backlight unit, it is desirable to make the thickness of the cover bottom thin. However, the thinner the thickness, the lower the rigidity and the larger the bulging amount.

However, in the case of the display backlight unit cover bottom according to the prior art including Patent Documents 1 and 2, since the rigidity is poor, it can be applied to, for example, a large-size display of about 65 inches There was a problem that would not exist.

An object of the present invention is to provide a large-area display backlight unit cover bottom having a small thickness and excellent rigidity.

In order to achieve the above object, a large-area display backlight unit cover bottom according to the present invention performs a reference setting and a light source directional control when a panel of a backlight unit (BLU) and a driving circuit unit are fixed A rectangular concave-convex reinforcing portion having a plurality of concave portions on a front surface reference and having a plurality of projections on a rear surface basis; And a vertical irregular reinforcing portion provided inside the rectangular irregular reinforcing portion and having a plurality of recessed portions on the basis of the front surface and having a plurality of projections on a rear surface basis.

In the large-area display backlight unit cover bottom according to the present invention, the rectangular concave-convex reinforcing portion has a large-sized concave portion sequentially provided on the outer periphery of the small-sized concave portion with respect to the front face, And protrusions of a large size are sequentially provided on the outer periphery of the protrusion.

The large-area display backlight unit cover bottom according to the present invention is characterized in that two rectangular concave-convex reinforcing portions are provided in the inside of the rectangular reinforcing concave portions so that the rectangular concave-convex reinforcing portions are divided into three equal parts.

The large-area display backlight unit cover bottom of the large-area display backlight unit according to the present invention is characterized in that an unformed portion is provided at a transverse portion of the rectangular concave-convex reinforcing portion at a portion where the upper and lower ends of the vertical concave-convex reinforcing portion meet.

In the large-area display backlight unit cover bottom according to the present invention, the unformed portion is formed or partially formed over the entire transverse portion of the rectangular concave-convex reinforcing portion.

According to the large area backlight unit cover bottom of the present invention, since the rigidity can be increased through the irregular reinforcing portion, it is possible to manufacture the backlight unit with a small thickness, thereby contributing to weight reduction and cost reduction of the large area display backlight unit.

According to the cover bottom of the large area display backlight unit according to the present invention, the uneven portion is provided at the portion where the rectangular concavo-convex reinforcing portion and the vertical concavo-convex reinforcing portion come into contact with each other to prevent stress from concentrating on the corresponding portion, .

1 is a perspective view of a large-area display backlight unit cover bottom according to a preferred embodiment of the present invention,
FIG. 2 is a front view of a large-area display backlight unit cover bottom according to the preferred embodiment,
3 is a longitudinal sectional view of a large-area display backlight unit cover bottom according to the preferred embodiment,
Figs. 4A to 4F are diagrams illustrating examples of forming a non-
Figs. 5A to 5C show molding examples of the reinforcing concave /
6A to 6C are diagrams showing displacements of the shape of the reinforcing concave and convex portions,
FIG. 7 is a graph comparing the stiffness of the reinforcing concavo-convex shape,
8A and 8B are diagrams showing models for the analysis of the strength,
FIGS. 9A and 9B are diagrams showing boundary conditions of the strength analysis,
FIG. 10A is a graph showing the stiffness comparison chart in the X-
10B is a Y-axis direction stiffness comparison graph.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a large-area display backlight unit cover bottom according to the present invention will be described in detail with reference to the accompanying drawings.

In the following, the terms "upward", "downward", "forward" and "rearward" and other directional terms are defined with reference to the states shown in the drawings.

FIG. 1 is a perspective view of a large-area display backlight unit cover bottom according to a preferred embodiment of the present invention, FIG. 2 is a front view of a large-area display backlight unit cover bottom according to the preferred embodiment, and FIG. Sectional view of a large-area display backlight unit cover bottom according to an embodiment of the present invention.

The large-area display backlight unit cover bottom 100 according to the preferred embodiment of the present invention performs reference setting and light source directional control when a panel of a backlight unit (BLU) and a driving circuit unit are fixed.

The large-area display backlight unit cover bottom 100 according to a preferred embodiment of the present invention has a shape of a rectangular metal plate having a long length and a small vertical length, and includes a rectangular concave-convex reinforcing portion 110 and a vertical concave-convex reinforcing portion 120, .

In the large-area display backlight unit cover bottom 100 according to the preferred embodiment of the present invention, the rectangular concave-convex reinforcing portion 110 has four concave portions 111 on the front face reference, and four convex portions 112 on the rear face reference side It is a form of a branch.

The rectangular concave-convex reinforcing portion 110 is formed in such a manner that a large-sized concave portion 111 is sequentially provided on the outer periphery of the small-sized concave portion 111 with respect to the front face as a reference, A protruding portion 112 having a large size is sequentially provided on the outer periphery of the protruding portion 112.

The vertical irregular reinforcing portion 120 is provided inside the rectangular irregular reinforcing portion 110.

In the large area backlight unit cover bottom 100 according to the preferred embodiment of the present invention, the two vertical irregular reinforcing portions 120 divide the rectangular irregular reinforcing portions 110 into three equal parts.

In the large-area display backlight unit cover bottom 100 according to the preferred embodiment of the present invention, the vertical irregular reinforcing portion 120 has the same shape as the rectangular irregular reinforcing portion 110.

That is, the vertical irregular reinforcing portion 120 has four recessed portions 121 on the front face reference and four protruding portions 122 on the rear face reference.

The unformed portion 130 is provided at the lateral portion of the rectangular concave-convex reinforcing portion 110 at the portion where the upper and lower ends of the vertical concave-convex reinforcing portion 120 meet.

The unformed portion 130 means a portion where the concave portion 111 and the protrusion 112 are not formed.

The unformed portion 130 may be formed over the entire lateral portion of the rectangular concave-convex reinforcing portion 110, or may be partially formed.

Figs. 4A to 4F are diagrams illustrating examples of formation of a non-formed portion.

The recessed portion 121 of the vertical concave-convex reinforcing portion 120 and the concave portion 111 of the rectangular concave-convex reinforcing portion 110 are naturally connected when the unformed portion 130 is not provided.

The unformed portion 130 is for preventing stress from concentrating at a portion where the vertical irregular reinforcing portion 120 and the rectangular irregular reinforcing portion 130 meet.

For example, if the unformed portion 130 is not provided, stress is concentrated on a portion where the vertical irregular reinforcing portion 120 meets the rectangular irregular reinforcing portion 130 when an external load is applied, do.

The large-area display backlight unit cover bottom 100 according to the preferred embodiment of the present invention is able to resist a load acting in the front-rear direction at the left and right ends of the front surface through the transverse portion of the rectangular concave-convex reinforcing portion 110, It is possible to resist the load acting in the front-rear direction at the upper and lower ends of the front surface through the vertical portion of the reinforcing portion 110 and the vertical irregular reinforcing portion 120.

In addition, stress can be prevented from being concentrated at a portion where the rectangular concave-convex reinforcing portion 110 and the vertical convex-concave reinforcing portion 120 meet through the unformed portion 130.

As described above, the large-area display backlight unit cover bottom 100 according to the preferred embodiment of the present invention has a structure that can withstand the loads in various directions, so that even if the bottom cover 100 is manufactured to have a thickness of 0.5 mm or less, It is possible to firmly support other components such as a substrate.

6A to 6C are graphs showing displacement of the shape of the reinforcing concave / convex portion, FIG. 7 is a graph comparing the stiffness of each convex / concave portion, and Table 1 is a graph The results are shown in Fig.

shape Wave Type 1 Wave Type 1 Wave Type 1 Displacement (mm) 13.4082 11.14552 11.90247 Load (N) 20 20 20

As shown in FIG. 7 and Table 1, it was predicted that the rigidity of the Wave Type 2 shape of FIG. 6B is better than that of the C shape of FIG. 6C or the A shape of FIG. 6A (Wave Type 2> Wave Type 3> Wave Type 1)

FIGS. 9A and 9B are graphs showing the boundary condition of the analysis of the strength, FIG. 10A is a graph of the stiffness comparison in the X-axis direction, FIG. Directional stiffness comparison graph, and Table 2 is a table showing results of the stiffness analysis.

10N load was applied in the X-axis direction and the Y-axis direction with respect to the center line of the plate material. As a result of analysis, when the load is applied in the X-axis direction as shown in Table 2 and FIGS. 11A and 11B, And the shape and pattern of Model 2 showed a large stiffness when the load was applied in the Y axis direction.

Model 1 Model 2 X-axis direction Y-axis direction X-axis direction Y-axis direction Displacement (mm) 46.21625 430.2936 52.87077 412.3857 Load (N) 10 10 10 10 Rigidity (N / mm) 0.216374 0.02324 0.18914 0.024249

As a result of vibration analysis, the stiffness of the model 2 shape and the pattern having the first natural frequency is relatively good.

The inherent frequency of an object is related to the stiffness and mass of the object and is expressed as: That is, when the stiffness is increased by 4 times, the natural frequency is doubled, and when the mass is increased by 4 times, the natural frequency is decreased by 2 times.

* Natural frequency = (stiffness / mass) ^(1/2)

In the case of Model 1, the maximum strain was 28%, the deformation greater than the elongation of the material (25%), and the deformation rate of Model 2 was 24.7%. In particular, the maximum deformation rate occurred at the corrugation end in the Y axis direction. Both models showed less than 10% change in thickness.

The large-area display backlight unit cover bottom 100 according to the present invention can improve the rigidity of the large-area backlight unit cover bottom 100 through the rectangular reinforcing projection 110 and the vertical reinforcing projection 120, The weight of the backlight unit can be reduced and the cost can be reduced.

Although the present invention has been described in detail with reference to the above embodiments by the inventors, the present invention is not limited to the above embodiments, and various modifications may be made without departing from the spirit of the present invention.

100: Large area display backlight unit cover bottom
110: Rectangular reinforcing convex / concave portion
120: vertical reinforcement concave /
130:

Claims (5)

A large-area display backlight unit cover that performs reference setting and light source directional control when fixing panel and driving circuit part of backlight unit (BLU)
A rectangular convexo-concave reinforcing portion 110 having a plurality of concave portions 111 as a front surface reference and having a plurality of protrusions 112 on a rear surface basis; And
And a vertical convex-concave reinforcing portion 120 provided inside the rectangular convex-concave reinforcing portion 110 and having a plurality of concave portions 121 on the front surface basis and a plurality of projecting portions 122 on the rear surface basis, Wherein the backlight unit includes a plurality of light emitting diodes. The method according to claim 1,
The rectangular concave-convex reinforcing portion 110 is formed in such a manner that a large-sized concave portion 111 is sequentially provided on the outer periphery of the small-sized concave portion 111 with respect to the front surface as a reference, And a protrusion (112) of a large size is sequentially provided on the outer periphery of the cover (112). The method according to claim 1,
Wherein the rectangular concave-convex reinforcing portion (110) is divided into three equal parts by providing two longitudinal concave-convex reinforcing portions (120) in the inside of the rectangular reinforcing concave portions (110). 4. The method according to any one of claims 1 to 3,
Wherein the unformed portion (130) is provided on a transverse portion of the rectangular concave-convex reinforcing portion (110) at a portion where the upper end and the lower end of the vertical concave-convex reinforcing portion (120) meet. 5. The method of claim 4,
And the unformed portion (130) is formed or partially formed over the entire lateral portion of the rectangular concave-convex reinforcing portion (110).

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