KR20100048042A - One-molding cover-bottom frame and direct-lighting type back-light unit using thereof - Google Patents

Abstract

PURPOSE: An integrated cover bottom frame and a backlight device using the same are provided to reduce manufacturing costs. CONSTITUTION: A supporting plate is combined with both ends of a reflective plate(130). A guide lamp and a supporting protrusion are formed in the upper side of the reflective plate. The guide lamp supports a lamp. The supporting protrusion supports an optical plate. A light leakage preventing partition(140) is formed along the supporting plate and an external edge of the reflective plate to prevent light of the lamp from being leaked to the outside.

Description

One-piece cover-bottom frame and direct-lighting type back-light unit using kind}

The present invention relates to a frame and a backlight unit of a cover bottom type, and more particularly, a support plate, a reflecting plate, and a light leakage preventing wall formed with a reflective block, an external electrode support hook, and an optical sheet holder are integrally formed so that the cover bottom is separately required. The present invention relates to a cover bottom frame having a structure capable of improving light efficiency and a backlight device using the same.

With the recent development of the information society, 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 display (VFD) Various flat panel display devices 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 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 illustrating a direct backlight device according to the related art, and FIG. 2 is an exploded perspective view illustrating a fastening state of the cover bottom, the support plate, and the side support of FIG. 1.

Referring to FIGS. 1 and 2, the conventional direct type backlight device supports a cover bottom 1 and a lamp external electrode of a press product installed inside the cover bottom 1 and supporting both ends of the lamp 2 on one side. A support plate 5 having a stopper 4 formed with a grip 3 and maintaining the position and spacing of the end of the external electrode 2a of the lamp 2 so that the other side can supply external power to the lamp 2. ), A side support 6 covering the support plate 5, an optical plate 7 supported on an upper surface of the side support 6 for diffusing and homogenizing light from the lamp 2, and A plurality of optical sheets 8 stacked on the optical plate 7 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 the components related thereto are also arranged on both sides, but the related components are bilaterally symmetrical, so that only one side is shown below and the other side is illustrated and described. 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 that the assembly is inferior and the manufacturing cost increases. In addition, since the lamp 2, the support plate 5, and the side support 6 are installed inside the separate cover bottom 1, there is a problem in that structural complexity and assembly are deteriorated.

In the case of the conventional direct type backlight device, as shown in FIG. 3, the luminance of the outer portion is slightly blacker than that of the center portion of the screen, thereby lowering the overall luminance and uniformity of the luminance.

The present invention has been proposed to solve the above problems, the support plate and the reflection plate, the light leakage preventing wall is formed integrally with the reflection block, the hook for supporting the external electrode, the optical sheet holder is formed integrally because the separate cover bottom is not combined And it is an object of the present invention to provide a cover bottom frame and a backlight device having a structure that can reduce the manufacturing cost and at the same time improve the light efficiency.

It is another object of the present invention to provide a cover bottom frame and a backlight device which can be more firmly coupled to a lamp external electrode support hook to grip the holder of the lamp electrode.

The cover bottom frame of the present invention for solving the above problems is a hook for supporting the lamp external electrode for supporting both ends of the lamp and a reflective block for reflecting the light emitted from the lamp into the backlight, for fixing the optical sheet A support plate on which the optical sheet holder is formed; And a reflecting plate at both ends of which the support plates are symmetrically coupled to each other, and an upper side of the reflecting plate having a guide lamp for supporting the lamp and a support protrusion for supporting the optical plate. And a light leakage preventing wall formed along the outer edges of the support plate and the reflector plate to prevent the light emitted from the lamp from leaking to the outside.

In the above-described configuration, the support plate, the reflecting plate, the light leakage preventing wall is characterized in that formed integrally.

In the above-described configuration, the reflective block is a polyhedral structure, the optical plate support surface for supporting the optical plate is formed on the upper surface, the optical sheet holder is formed on both sides of the first locking projection and the second locking projection in the center of the upper surface Characterized in that is formed.

In the above-described configuration, the reflector is characterized in that the cross-section is formed to protrude upwards in a curved surface or a polyhedral structure.

In addition, the backlight device of the present invention is a lamp external electrode support for supporting both ends of the lamp, a reflection block for reflecting the light emitted from the lamp into the backlight, a support plate provided with an optical sheet holder for fixing the optical sheet; The support plate is symmetrically coupled to both ends as a panel, and a reflecting plate on which a guide lamp for supporting the lamp and a support protrusion for supporting the optical plate is formed on the upper side, and to prevent leakage of light emitted from the lamp to the outside. Cover bottom frame is formed along the outer edge of the support plate and the reflecting plate, the light leakage preventing wall is provided with a fastening means with the guide panel, integrally formed; 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 power; A lamp having an external electrode coupled to the holder of the grip electrode; An optical plate and an optical sheet stacked on the cover bottom frame to collect light emitted from the lamp and to uniformly emit the light toward the upper side; It includes.

According to the present invention, the cover bottom frame is formed of a reflecting block, a hook for supporting external electrodes, a support plate on which an optical sheet holder is formed, a reflecting plate, and a light leakage preventing wall are integrally formed so that a separate cover bottom is not coupled to the assembly of the backlight device. Improve and reduce manufacturing costs.

In addition, the light leakage preventing wall is formed along the edge of the cover bottom frame, the reflecting plate is formed of a polyhedral structure, and a plurality of reflective blocks, optical plates, and optical sheet fixing means are integrally formed on the support plate, so that a separate side support is not required. In addition to improving the assemblability of the backlight device, the luminance of light emitted from the front surface and the uniformity of the luminance can be improved.

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 outer electrode of the lamp is coupled to the inside of the holder and the outer structure of the holder is a dual structure coupled to the lamp external electrode support hook of the support plate, the holder of the grip electrode is positioned between the lamp external electrode support hook and the external electrode of the lamp By doing so, there is an effect of preventing the aging of the lamp external electrode support hook and the temperature of the lamp electrode portion.

Hereinafter, a power connection device and a direct backlight device of an external electrode fluorescent lamp according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a perspective view showing a cover bottom frame according to an embodiment of the present invention, Figure 4 is a perspective view showing a detailed structure of the light leakage preventing wall of Figure 3, Figure 5 is a cross-sectional view showing a detailed structure of the reflecting plate of FIG.

3 and 4, the cover bottom frame 10 according to the embodiment of the present invention has a lamp external electrode support hook 111 supporting both ends of the lamp 2 on one side thereof, and the other side thereof. On the support plate 110 is formed a reflective block 113 for reflecting the light emitted from the lamp 2 into the backlight and the reflecting plate 130, lamp ( It is composed of a light leakage preventing wall 140 formed along the edge of the reflecting plate 130 to block the light emitted from 2) to leak outside.

In more detail, the support plate 110 is a part having a grip electrode 120 for supporting both ends of the lamp 2 on one side and supplying power to the lamp 2. Together with the electrode 120, a power connection device in the backlight device is constituted (see FIG. 7). The detailed configuration and coupling state of the power connection device 100 will be described later.

The reflective block 113 serves to reflect the light emitted from the lamp 2 to the effective area of the backlight device, and is evenly arranged along the longitudinal direction of the support plate 110. The effective area is an area excluding the edge of the backlight device and refers to an area that emits light from the lower side of the liquid crystal display panel (not shown) to function as a backlight, and refers to overall luminance and uniformity of brightness in the effective area. Will be improved.

The light leakage preventing wall 140 is to prevent the light emitted from the lamp 2 from leaking to the outside of the side of the backlight device, and forms a wall along the outer edge of the support plate 110 and the reflector plate 130. do. Light leaking to the outside of the side by the light leakage preventing wall 140 is blocked in advance, it is possible to improve the brightness and uniformity in the vicinity of the power connection device as well as the effective area of the backlight device.

In addition, a plurality of fastening means 141 are formed on the outer wall of the light leakage preventing wall 140 to secure the coupling with the guide panel 40 of FIG. 6 when the backlight device is assembled. The fastening means 141 may be configured in various shapes such as protrusions, grooves, holes, etc. which are conventional fastening means, and are formed in a configuration corresponding to the fastening means of the guide panel 40.

In addition to preventing light leakage by the light leakage preventing wall 140, the cover bottom frame 10 may be directly coupled to the guide panel 40 (see FIG. 6), according to an embodiment of the present invention. In the backlight device, a separate cover bottom according to the related art (1 in FIG. 1) is not required, so that the structure may be simplified and assembly may be improved.

The reflecting plate 130 connects the corresponding pair of supporting plates 110 from the lower side, and simultaneously reflects the light emitted downward from the lamp 2 to the upper front surface to increase luminance.

The reflective plate 130 may be generally formed in a flat panel shape as a rectangular panel, but in the embodiment of the present invention, the cross-section is curved upward to increase the efficiency of reflection, as shown in FIG. 5. It is formed into a polyhedral structure. By such a structure, the light emitted downwards can be focused upward and dispersed in various directions, thereby improving brightness and uniformity of brightness.

In addition, a guide lamp 131 for supporting the fluorescent lamp is formed on the upper side of the reflecting plate 130, and a plurality of support protrusions 132 for supporting the optical plate 20 and the optical sheet 30 are formed. . When the long bar-shaped lamp 2 is combined, the center portion is struck downward, and the guide lamp 131 prevents it so that the lamp 2 can be stably coupled. Each lamp 2 One or more are formed with respect to. The support protrusions 132 are formed in the shape of protruding to the upper surface of the reflecting plate 130 to prevent sagging due to load when the optical plate 20 or the optical sheet 30 is stacked.

On the other hand, the support plate 110 and the reflector plate 130, the light leakage preventing wall 140, the guide lamp 131, the support protrusion 132 is formed integrally as a resin material, the hook 111 for supporting the lamp external electrode, The reflective block 113 may also be formed as a separate component from the support plate 110, but is preferably formed integrally. When the lamp external electrode support hook 111 and the reflective block 113 are integrally formed, the lamp external electrode support hook 111 and the reflective block 113 may be advantageous in terms of relative rigidity rather than a separate component.

6 is a perspective view showing a support plate and a grip electrode of the power connection device according to an embodiment of the present invention, Figure 7 is a perspective view showing a support plate and a grip electrode of the power connection device of Figure 6, Figure 8 is a support plate and 9 is a perspective view showing the detailed structure of the grip electrode, Figure 9 is a perspective view showing another embodiment of the reflective block of FIG.

Referring to FIG. 6, a backlight device according to an exemplary embodiment of the present invention includes a support plate 110 supporting both ends of a lamp, a reflector plate 130 reflecting light emitted from the lamp, and light emitted from the lamp. A cover for supporting the lamp external electrode of the support plate to supply power by contacting the external electrode of the lamp on the upper side of the cover bottom frame 10 having the light leakage preventing wall 140 integrally formed to block leakage from the outside. A grip electrode 120 having a holder coupled to the grip electrode 120; A lamp having an external electrode; An optical plate 20 and an optical sheet 30 for condensing the light emitted from the lamp and uniformly outputting the light toward the upper side; Guide panel 40; forms a structure that is sequentially coupled.

6 to 9, the cover bottom frame has a structure in which the support plate 110, the reflector plate 130, and the light leakage preventing wall 140 are integrally formed of a synthetic resin material. In addition, as described above, the support plate 110 is provided with an external electrode support hook 111 and a reflection block 113, and the guide plate 131 and the support protrusion 132 are formed on the reflection plate 130. The light leakage preventing wall 140 is formed with fastening means 141 to the guide panel 40, respectively. In FIG. 6, the cover bottom frame 10 is illustrated on only one side, but is formed symmetrically on both sides.

In the backlight device according to the embodiment of the present invention, the grip electrode 120 is easily fastened by the cover bottom frame 10 structure as described above, and the lamp 2, the optical plate 20, and the optical sheet 30 are connected to each other. It may be stably seated, and the guide panel 40 may be directly assembled to the cover bottom frame 10. Therefore, since the separate cover bottom (1 in FIG. 1) is not fastened, the assemblability is improved and the manufacturing cost can be reduced.

 Meanwhile, as shown in FIGS. 7 and 8, the support plate 110 of the cover bottom frame 10 forms the power connection device 100 together with the grip electrode 120, and the outside of the support plate 110. The holder 121 of the grip electrode is fixedly coupled to the electrode support hook 111, and the end of the external electrode lamp 2 is fitted to the holder 121 of the grip electrode to supply power from the outside to the lamp. do. The hook external electrode support hook 111 is made of a resin material of synthetic resin, and the grip electrode 120 is made of a press material made of metal for conductivity.

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. Are arranged parallel along the longitudinal direction.

A stopper 115 is further formed on an adjacent outer side between the lamp external electrode support hooks 111 to support an end of the lamp 2 to limit the movement of the lamp 2. The stopper 115 prevents the lamp 2 from being pushed outward so that it can be stably fixed to the external electrode support hook 111.

The reflective block 113 reflects the light emitted from the lamp 2 toward the guide panel 40, which is an effective area of the backlight device, and is evenly arranged along the longitudinal direction of the support plate 110. . The reflective block 113 may be formed not only of a trihedron structure but also a quadrangular or curved structure as shown in FIG. 9.

FIG. 10 is a perspective view illustrating a coupling of the lamp external electrode support hook and the grip electrode of FIG. 7, and FIGS. 11 and 12 are cross-sectional views illustrating a process of coupling the lamp external electrode support hook and the grip electrode of FIG. 10.

10 to 12, 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. 13 is a perspective view illustrating another example of a lamp external electrode support hook and a grip electrode, and FIG. 14 is a perspective view illustrating a combination of the lamp external electrode support hook and a grip electrode of FIG. 13, and FIGS. 15 and 16 are FIGS. 14 is a cross-sectional view illustrating a coupling process of a lamp external electrode support hook and a grip electrode of FIG.

13 to 16, a lamp external electrode support hook 211 according to another embodiment includes a fixing groove 211a formed at the center and a locking jaw portion 211b formed at both sides of the fixing groove 211a. It consists of.

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 both of the fixing protrusion 221a so as to be caught by the locking jaw portion 211b. It consists of a locking projection (221b) formed in.

In the combination of the lamp external electrode support hook and the grip electrode according to another embodiment of the present invention, when the holder 221 is inserted between the lamp external electrode support hook 211, the lamp external electrode support hook 211 ) Is elastically deformed.

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 211b, so that the holder 221 is attached to the lamp external electrode support hook 211. It is firmly combined.

FIG. 17 is a perspective view illustrating an optical plate seated on an optical plate support surface, and FIG. 18 is a perspective view illustrating an optical sheet seated on a first catching protrusion and a second catching protrusion.

Referring to the drawings, the optical plate support surface 114 for supporting the outer portion of the optical plate 20 is formed on the upper surface of the reflective block 113.

At the end of the support plate 110, an optical sheet holder 117 for horizontally fixing the optical sheet 30 placed on the upper surface of the optical plate 20 is integrally formed.

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.

The optical sheet 30 has a protrusion formed to correspond to the first locking protrusion, and the locking hole 31 is formed at the protrusion to correspond to the second locking protrusion, so that the first locking protrusion 118 and the second protrusion are formed. By the locking protrusion 119, the front, rear, left and right movement of the optical sheet 30 can be effectively prevented.

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 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.

The light emitted to the side by the lamp 2 is reflected by the reflective block 113 toward the optical plate 20 and the optical sheet 30 which are the effective areas of the backlight device, and the backlight is prevented by the light leakage preventing wall 140. Light leaking out of the device is blocked. The reflective block 113 and the light leakage preventing wall 140 properly compensate for the light loss generated from the side of the lamp 2 to improve the brightness and uniformity of the brightness.

In addition, the light emitted downward from the lamp is reflected back to the upper side by the reflecting plate 130 of the cover bottom frame 10, wherein the cross section of the reflecting plate 130 has a curved or polyhedral structure to disperse light By doing so, not only luminance but also uniformity can be improved.

As described above, the cover bottom frame 10 according to the embodiment of the present invention is integrally configured with the support plate 110, the reflector plate 130, and the light leakage preventing wall 140, and the reflector block (eg, the support plate 110). 113, the external electrode support hook 111 is integrally formed, so that a separate cover bottom is not coupled, thereby improving the assemblability of the backlight device and reducing the manufacturing cost. The light emitted from the lamp 2 can be reduced. By reflecting more efficiently, the light uniformity can be improved.

In addition, the outer portion of the optical plate 20 is supported by the optical plate support surface 114 of the reflective block 113, the first locking projections 118 and the second locking projections of the optical sheet holder 117. The front and rear left and right movement of the optical sheet 30 can be effectively prevented by 119 to be stably seated.

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 power connection device and the backlight device are described as preferred embodiments of the present invention. However, the technology of the present invention may 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 direct backlight device according to the prior art;

Figure 2 is an exploded perspective view showing a fastening state of the cover bottom and the support plate, the side support of Figure 1,

3 is a perspective view showing a cover bottom frame according to an embodiment of the present invention,

4 is a perspective view showing a detailed structure of the light leakage preventing wall of FIG.

5 is a cross-sectional view showing a detailed structure of the reflecting plate of FIG.

6 is an exploded perspective view showing a direct backlight device according to an embodiment of the present invention;

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

8 is a perspective view showing a detailed structure of the support plate and the grip electrode of FIG.

9 is a perspective view showing another embodiment of the reflective block of FIG. 8;

FIG. 10 is a perspective view illustrating a combination of a hook external electrode supporting hook and a grip electrode of FIG. 7;

11 and 12 are cross-sectional views illustrating a coupling process of the lamp external electrode support hook and the grip electrode of FIG. 10;

FIG. 13 is a perspective view illustrating another embodiment of a lamp external electrode support hook and a grip electrode; FIG.

14 is a perspective view illustrating a combination of a lamp external electrode support hook and a grip electrode of FIG. 13;

15 and 16 are cross-sectional views illustrating a coupling process of the lamp external electrode supporting hook and the grip electrode of FIG. 14;

17 is a perspective view showing an optical plate seated on the optical plate support surface,

18 is a perspective view illustrating an optical sheet seated on a first catching protrusion and a second catching protrusion.

** Description of symbols for the main parts of the drawing **

10: cover bottom frame 20: optical plate

30: optical sheet 31: jam hole

40: guide panel

100: power connection device 110: support plate

111: hook for supporting the lamp external electrode 112: locking jaw

113: reflective block 114: optical plate support surface

115: stopper 117: optical sheet holder

118: first jamming projection 119: second jamming projection

120: grip electrode 121: holder

130: reflector 131: guide lamp

132: support protrusion

140: light leakage prevention wall 141: fastening protrusion

211a: fixing groove 211b: locking jaw

221a: fixing protrusion 221b: locking protrusion

Claims (5)

A support plate having a lamp external electrode support hook for supporting both ends of the lamp, a reflection block for reflecting light emitted from the lamp into the backlight, and an optical sheet holder for fixing the optical sheet; And A reflection plate having both ends of the support plate symmetrically coupled to each other, and an upper side of which a guide lamp for supporting the lamp and a support protrusion for supporting the optical plate; And a light leakage preventing wall formed along outer edges of the support plate and the reflector to prevent light emitted from the lamp from leaking to the outside. The method of claim 1, The cover bottom frame, characterized in that the support plate, the reflection plate, the light leakage preventing wall is formed integrally. The method according to claim 1 or 2, The reflective block is a polyhedral structure is formed with an optical plate support surface for supporting the optical plate on the upper surface, The cover sheet frame, characterized in that the optical sheet holder is formed on both sides of the first engaging projections and the second engaging projection is formed in the center of the upper surface. The method according to claim 1 or 2, The reflector plate is a cover bottom frame, characterized in that the cross-section is formed to protrude upward or in the form of a polyhedral structure. The backlight device to which the cover bottom frame of any one of claims 1 to 4 is applied.

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