KR20100012515A - Direct-lighting type back-light apparatus and power connecting apparatus thereof - Google Patents

Abstract

PURPOSE: A direct lighting type backlight apparatus and a power connecting apparatus thereof are provided to form a reflection unit on a supporting plate, thereby improving assembling property. CONSTITUTION: On one side of a supporting plate(110), a lamp external electrode supporting hook for supporting both ends of a lamp(2). On the other side of the supporting plate, a reflection unit reflecting light emitted from the lamp is formed. A grip electrode(120) includes a holder combined on the lamp external electrode supporting hook to supply external power by connecting an external electrode(2a) of the lamp. The lamp external electrode supporting hook and the reflection unit are formed into one body on the supporting plate. The reflection unit is a polyhedral structure.

Description

Direct-lighting type back-light apparatus and power connecting apparatus

The present invention relates to a direct type backlight device and a power connection device thereof, and more particularly, to a direct type backlight device and a power connection device having improved light uniformity and an improved power connection structure.

Recently, as the information society develops, the demand for display devices is increasing in various forms. Accordingly, liquid crystal display (LCD), plasma display panel (PDP), electro luminescent display (ELD), and vacuum fluorescent (VFD) are required.

Various flat panel display devices such as displays have been researched and developed.

LCDs are widely used as mobile flat panel display devices because of their excellent image quality, light weight, thinness, and low power consumption. In particular, LCDs are widely used as notebooks, computer monitors, and TV monitors.

However, LCDs do not emit light by themselves and require a separate external light source to realize high quality images. Therefore, the LCD further includes a backlight device in addition to the guide panel (liquid crystal display panel).

In general, a backlight of a liquid crystal display device is classified into an edge-lighting and a direct-lighting backlight according to a method of disposing a light source, and as a light source, a CCFL (Cold Cathode Fluorescent Lamp), Cylindrical fluorescent lamps such as Hot Cathode Fluorescent Lamp (HCFL) and External Electrode Fluorescent Lamp (EEFL), Light Emitting Diode (LED) devices, Electro Luminescence (EL) devices and the like are used.

Lateral backlights are mainly used in LCDs for the purpose of thinning portable communication devices due to their relatively thin thickness.

Direct type backlights are mainly used in LCDs for large screens such as notebooks and TV monitors due to their high light efficiency. In particular, recently, flat panel display devices such as TVs and computer monitors using LCDs are becoming larger and larger in size, and thus, direct type backlight devices are increasing in use and being developed in various forms.

Fluorescent lamps are often used as light sources in large backlight devices, and fluorescent lamps include an external electrode fluorescent lamp in which an electrode for power connection is formed outside the lamp and an electrode inside the lamp. It can be divided into Internal Electrode Fluorescent Lamp.

1 is an exploded perspective view showing a conventional direct type backlight device, FIG. 2 is an exploded perspective view showing the power connection device and the side support of FIG. 1, and FIG. 3 is a perspective view showing the side support coupled to the cover bottom of FIG. 2. 4 is a view showing a light analysis screen in the conventional direct type backlight device.

1 to 3, the conventional direct type backlight device supports a bottom cover 1 and a lamp external electrode of a synthetic resin installed inside the cover bottom 1 and supporting both ends of the lamp 2 on one side. A support plate 5 having ribs 3 formed thereon and having a stopper 4 in contact with an end of the external electrode 2a of the lamp 2 so as to supply external power to the lamp 2 on the other side; A side support 6 covering the support plate 5, an optical plate 7 supported on the upper surface of the side support 6 for diffusing and homogenizing light from the lamp 2, and the optical plate 7 ) And a plurality of optical sheets 8 stacked on the guide panel 9 and a guide panel 9 coupled to the cover bottom 1.

The external electrodes 2a are formed on both sides of the lamp 2, and components related thereto are also arranged on both sides, but the related components are bilaterally symmetrical with each other. Omit.

In the conventional direct type backlight device configured as described above, the side support 6 must be separately installed on the side of the support plate 5 to compensate for the light loss occurring on the side of the lamp 2 and to fix the aforementioned optical components. Therefore, there is a problem in that the assembly is poor and the manufacturing cost increases.

In addition, in the case of the conventional direct type backlight device, as shown in FIG. 4, the luminance of the outer portion is slightly blacker than that of the center portion of the screen, resulting in poor light uniformity.

The present invention is to solve the above-mentioned problems, by forming a plurality of reflective parts integrally to the support plate to improve the assembly and manufacturing cost, as well as to improve the light uniformity direct type backlight device and its power connection device The purpose is to provide.

Another object of the present invention is to provide a direct type backlight device and a power connection device thereof, in which a grip electrode holder is more firmly coupled to a lamp external electrode support hook to prevent noise caused by vibration of the lamp.

In order to achieve the above object, the direct type backlight device of the present invention includes a cover bottom; A support plate installed inside the cover bottom and having a lamp external electrode support hook supporting one end of the lamp on one side thereof, and a reflecting part reflecting light rays emitted from the lamp on the other side thereof; A grip electrode having a holder in contact with an external electrode of the lamp, the holder being coupled to the lamp external electrode support hook to supply external power to the lamp; An optical plate supported on an upper surface of the reflector to diffuse and uniformize light from the lamp; A plurality of optical sheets stacked on the optical plate; And a guide panel coupled to the cover bottom.

On the other hand, the power connection device of the present invention is a support plate for supporting a lamp external electrode for supporting both ends of the lamp is formed on one side and the reflection plate for reflecting the light emitted from the lamp on the other side; And a grip electrode having a holder coupled to the lamp external electrode support hook to be in contact with the external electrode of the lamp to supply external power.

The hook for supporting the external electrode of the lamp is made of synthetic resin, and the grip electrode is made of press material made of metal.

The lamp external electrode support hook and the reflector may be integrally formed on the support plate, or may be formed as separate components and fastened to the support plate.

The reflector reflects light emitted from the lamp toward the liquid crystal display panel, and may be a monohedral structure or a polyhedron structure.

An optical plate support surface for supporting an outer portion of the optical plate may be formed on an upper surface of the reflective part.

An optical sheet holder for fixing the optical sheet placed on the upper surface of the optical plate may be integrally formed at the end of the support plate.

First locking protrusions may be formed at both sides of the upper surface of the optical sheet holder, and two locking protrusions may be formed at the center of the upper surface of the optical sheet holder.

The holder may have a structure in which an upper end of the holder is elastically caught by a locking jaw formed in the lamp external electrode support hook.

As described above, according to the present invention, the reflector is integrally formed on the support plate, thereby improving the assemblability and manufacturing cost, as well as more efficiently reflecting the light emitted from the lamp, thereby improving light uniformity.

In addition, the grip electrode holder is more firmly coupled to the lamp external electrode support hook to prevent noise caused by the vibration of the lamp.

In addition, the holder of the grip electrode is positioned between the lamp external electrode support hook and the lamp external electrode, thereby preventing the aging of the lamp external electrode support hook and reducing the temperature of the lamp electrode part.

Hereinafter, a direct type backlight device and a power supply connecting device thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

5 is an exploded perspective view showing a direct type backlight device according to the present invention, FIG. 6 is a perspective view showing a support plate and a grip electrode of the power connection device of FIG. 5, FIG. 7 is an enlarged view of the main portion of FIG. 6, FIGS. 8 and 9 6 is a perspective view illustrating another modified example of the reflective part of FIG. 6, FIG. 10 is a perspective view showing an optical plate seated on the optical plate supporting surface of FIG. 7, and FIG. 11 is an action of the first locking protrusion and the second locking protrusion of FIG. 7. It is a perspective view explaining.

5 to 11, the direct type backlight device of the present invention includes a cover bottom 10; Is installed inside the cover bottom 10, a lamp external electrode support hook 111 for supporting both ends of the lamp 2 is formed on one side and reflects the light emitted from the lamp 2 on the other side A support plate 110 on which a reflector 113 is formed; A grip electrode (120) having a holder (121) coupled to the lamp external electrode support hook to be in contact with the external electrode of the lamp to supply external power to the lamp; An optical plate 20 supported above the reflecting portion 113 to diffuse and uniformize light from the lamp 2; A plurality of optical sheets 30 stacked on the optical plate 20; And a guide panel 40 coupled to the cover bottom 10.

In addition, the power connection device 100 of the present invention is formed with a lamp external electrode support hook 111 for supporting both ends of the lamp 2 on one side and reflects the light emitted from the lamp 2 on the other side A support plate 110 on which a reflector 113 is formed; And a grip electrode 120 having a holder 121 coupled to the lamp external electrode support hook 111 to be in contact with the external electrode 2a of the lamp 2 to supply external power.

More specifically, the support plate 110 is fixedly installed in the cover bottom 10 by a conventional fastening means, and grip electrodes for supporting both ends of the lamp 2 and supplying power to the lamp 2 ( 120) is a component to be installed.

The lamp external electrode support hooks 111 formed on the upper surface of the support plate 110 are formed to face each other at a predetermined interval, and these two sets of lamp external electrode support hooks 111 are supported on the support plate 110. It is arranged evenly along the longitudinal direction of.

A stopper 115 is formed at a position adjacent to the lamp external electrode support hook 111 to support the end of the lamp 2 to limit the movement of the lamp 2.

The hook 111 for supporting the external electrode of the lamp is made of a synthetic resin material, and the grip electrode 120 is made of a press material made of metal.

The reflector 113 serves to reflect the light beam emitted from the lamp 2 toward the guide panel 40, and is uniformly arranged along the longitudinal direction of the support plate 110. The reflective part 113 may be of course not only a triangular structure but also a quadrangular structure shown in FIG. 8 or a curved shape shown in FIG. 9.

The lamp external electrode support hook 111 and the reflector 113 may be formed as a separate component from the support plate 110 (not shown), or may be integrally formed on the support plate 110. .

When the lamp external electrode support hook 111 and the reflector 113 are integrally formed, the lamp external electrode support hook 111 and the reflective part 113 may be advantageous in terms of relative rigidity (strength) rather than being configured as a separate component.

When the lamp external electrode support hook 111 and the reflector 113 are formed as separate components, the lamp external electrode support hooks that are heat deformed or damaged without having to replace the entire support plate 110 may be used. Since only the 111 and the reflective part 113 need to be replaced, it is advantageous in terms of maintenance.

7, 10, and 11, an optical plate support surface 114 for supporting an outer portion of the optical plate 20 is formed on an upper surface of the reflector 113.

An optical sheet holder 117 that horizontally fixes the optical sheet 30 placed on the upper surface of the optical plate 20 is integrally formed at the end of the support plate 110.

First locking protrusions 118 may be formed at both sides of the upper surface of the optical sheet holder 117, and second locking protrusions 119 may be formed at the center of the upper surface of the optical sheet holder 117.

A locking hole 31 is formed at an outer side of the optical sheet 30 to correspond to the second locking protrusion 119.

The front and rear left and right movements of the optical sheet 30 are effectively prevented by the first locking protrusion 118 and the second locking protrusion 119.

12 is a perspective view illustrating a coupling of the lamp external electrode support hook and the grip electrode of FIG. 5, and FIGS. 13 and 14 are cross-sectional views illustrating a process of coupling the hook external electrode support hook and the grip electrode of FIG. 12.

12 to 14, the grip electrode 120 is in contact with the external electrode 2a of the lamp 2 and serves to supply external power, and the holder 121 of the grip electrode 120 is After elastically inserted into the lamp external electrode support hook 111, the upper end of the holder 121 is made of a structure that is elastically caught on the locking jaw 112 formed inside the lamp external electrode support hook 111. have.

In such a coupling structure of the lamp external electrode support hook 111 and the grip electrode 120, when the lamp 2 is inserted into the holder 121 of the grip electrode 120, the holder 121 opens to both sides. While elastically deformed. At this time, after the lamp 2 is inserted into the holder 121, the holder 121 is elastically restored to its original position, whereby the lamp 2 is firmly fixed in the holder 121.

FIG. 15 is a perspective view illustrating another example of a lamp external electrode support hook and a grip electrode, and FIG. 16 is a perspective view illustrating a combination of the lamp external electrode support hook and the grip electrode of FIG. 15, and FIGS. 17 and 18 are FIGS. 16 is a cross-sectional view illustrating a coupling process of a lamp external electrode support hook and a grip electrode of FIG. 16.

15 to 18, a lamp external electrode support hook 211 according to another example includes a fixing groove 211a formed at the center and a locking jaw portion formed at both sides of the fixing groove 211a. 211b).

The holder 221 of the grip electrode 220 has a fixing protrusion 221a formed at the center thereof so as to be inserted into the fixing groove 211a and the fixing protrusion 211 so as to be caught by the locking jaw portion 211b. It consists of the locking projection part 221b formed in both sides of 221a.

In the coupling of the lamp external electrode support hook and the grip electrode according to another example, when the holder 221 is inserted between the lamp external electrode support hook 211, the lamp external electrode support hook 211 is elastically deformed. As it happens.

At this time, the fixing protrusion 221a is inserted into the fixing groove 211a, and at the same time, the locking protrusion 221b is caught by the locking jaw portion 211b, so that the holder 221 hook for supporting the lamp external electrode. It is firmly coupled to 211.

Referring to the operation of the direct type backlight device and its power connection device configured as described above are as follows.

When power is applied to the direct type backlight device, the lamp 2 emits light through the holder 121 of the grip electrode 120 and the external electrode 2a of the lamp 2 in contact with the holder 121. do.

Light emitted by the lamp 2 is reflected by the reflecting portion 113 toward the optical plate 20 and the optical sheet 30. The reflector 113 appropriately compensates for the light loss occurring at the side of the lamp 2 to improve the light uniformity.

19 is a view showing a light analysis screen in the direct type backlight device of the present invention.

As shown in FIG. 19, in the direct type backlight device of the present invention, the luminance of the center portion and the outer portion of the screen is the same, and thus, the light uniformity is greatly improved.

As described above, referring to FIGS. 7, 10, and 11, the outer portion of the optical plate 20 is supported by the optical plate support surface 114 of the reflector 113.

The front and rear left and right movements of the optical sheet 30 are effectively prevented by the first locking protrusion 118 and the second locking protrusion 119 of the optical sheet holder 117.

The holder 121 of the grip electrode 120 may be firmly fixed in the lamp external electrode support hook 211.

As described above, according to the present invention, the reflector 113 is integrally formed on the support plate 110, thereby improving assembly performance and reducing manufacturing costs, and more effectively reflecting the light emitted from the lamp 2 to provide light. Uniformity can be improved.

In addition, the holder 121 of the grip electrode 120 is more firmly coupled to the lamp external electrode support hook 111, thereby preventing noise caused by the vibration of the lamp 2.

In addition, the holder 121 of the grip electrode 120 is positioned between the lamp external electrode support hook 111 and the external electrode 2a of the lamp 2, thereby preventing aging of the lamp external electrode support hook 111. And a temperature reduction effect of the lamp electrode.

As described above, the backlight device is described as a preferred embodiment of the present invention, but the technology of the present invention can be applied to other fields. As such, the rights of the present invention are not limited to the embodiments described above, but are defined by the claims, and those skilled in the art can make various modifications within the scope of the claims. It is self evident.

1 is an exploded perspective view showing a conventional direct type backlight device

FIG. 2 is an exploded perspective view illustrating the power connector and the side support of FIG. 1. FIG.

3 is a perspective view showing a side support coupled to the cover bottom of FIG.

4 is a view showing a light analysis screen in a conventional direct type backlight device;

5 is an exploded perspective view showing a direct type backlight device according to the present invention;

6 is a perspective view showing a support plate and a grip electrode of the power connection device of FIG.

Figure 7 is an enlarged view of the excerpts of Figure 6

8 and 9 are perspective views illustrating other modified examples of the reflective part of FIG. 6.

10 is a perspective view showing an optical plate seated on the optical plate support surface of FIG.

FIG. 11 is a perspective view illustrating the action of the first locking projections and the second locking projections of FIG. 7; FIG.

12 is a perspective view illustrating a combination of a hook external electrode support hook and a grip electrode of FIG. 5;

13 and 14 are cross-sectional views illustrating a process of coupling the hook external electrode support hook and the grip electrode of FIG. 12.

15 is a perspective view illustrating another example of a lamp external electrode support hook and a grip electrode;

FIG. 16 is a perspective view illustrating a coupling of the lamp external electrode support hook and the grip electrode of FIG. 15; FIG.

17 and 18 are cross-sectional views illustrating a coupling process of the lamp external electrode supporting hook and the grip electrode of FIG. 16.

19 is a view showing a light analysis screen in the direct type backlight device according to the present invention.

* Description of main parts

10: Cover Bottom

30: optical sheet

31: hanging hole

40: guide panel

100: power connection device

110: support plate

111: hook for supporting the lamp external electrode

112: hanging jaw

113: reflection

114: optical plate support surface

115: stopper

117: optical sheet guide

118: first jamming projection

119: 2nd jamming projection

120: grip electrode

121: holder

211a: fixed groove part

211b: hanging jaw

221a: fixed protrusion

221b: hanging projection

Claims (6)

A support plate having a lamp external electrode support hook for supporting both ends of the lamp at one side thereof, and a reflecting portion for reflecting light rays emitted from the lamp at the other side thereof; And And a grip electrode having a holder coupled to the lamp external electrode support hook to be in contact with the external electrode of the lamp to supply external power. The method of claim 1, The lamp external electrode support hook and the reflector are integrally formed on the support plate, the power supply of the direct type backlight device. The method according to claim 1 or 2, The reflection unit is a power supply connecting device of the direct type backlight device, characterized in that the polyhedral structure. The method according to claim 1 or 2, An optical plate support surface for supporting the optical plate is formed on the upper surface of the reflecting portion, an optical sheet holder for fixing the optical sheet to the end of the support plate is integrally formed, A first locking projection is formed on both sides of the upper surface of the optical sheet fixing unit, and a second locking projection is formed on the center of the upper surface of the direct type backlight device. The method according to claim 1 or 2, The upper end of the holder is connected to the power supply of the direct type backlight device, characterized in that the elastically caught on the engaging jaw formed in the lamp external electrode support hook. Cover bottom; A support plate installed inside the cover bottom and having a lamp external electrode support hook supporting one end of the lamp on one side thereof, and a reflecting part reflecting light rays emitted from the lamp on the other side thereof; A grip electrode having a holder in contact with an external electrode of the lamp, the holder being coupled to the lamp external electrode support hook to supply external power to the lamp; An optical plate supported on an upper surface of the reflector to diffuse and uniformize light from the lamp; A plurality of optical sheets stacked on the optical plate; And And a guide panel coupled to the cover bottom.

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