KR20070120856A - Lamp guide and liquid crystal display device having thereof - Google Patents

Abstract

A lamp guide and an LCD having the same are provided to fix the lamp guide by screw-joining the lamp guide to the cover bottom. A cover bottom(129) is positioned below an LCD panel, wherein the cover bottom has at least one join hole. A lamp guide has a join portion(135) screw-joined to the join hole of the cover bottom, and at least one lamp holder(131). At least one lamp(121) for supplying light to the LCD panel is held to the lamp holder. An optical sheet is positioned above the cover bottom and the lamp to increase the light efficiency. The lamp guide has one or more supports for supporting the optical sheet.

Description

Lamp guide and liquid crystal display device having same {LAMP GUIDE AND LIQUID CRYSTAL DISPLAY DEVICE HAVING THEREOF}

1 is an exploded perspective view showing a liquid crystal display device.

2 is a cross-sectional view showing a direct type backlight unit.

3 is a cross-sectional view showing a conventional lamp guide.

4A, 5A, and 6A are perspective views illustrating a conventional lamp guide, and FIGS. 4B, 5B, and 6B are cross-sectional views of respective embodiments.

7 is a cross-sectional view showing a lamp guide according to an embodiment of the present invention.

8 is a cross-sectional view showing a backlight unit according to an embodiment of the present invention.

9 is a perspective view showing a cover bottom according to an embodiment of the present invention.

10 is a cross-sectional view showing a backlight unit according to an embodiment of the present invention.

<Description of Drawings on Main Parts of Drawings>

31, 131: lamp holder 32, 132: fixed support

35, 135: fastening portion 140: fastening hole

150: fastening protrusion 160: fastening groove

In recent years, due to the rapid development of the information and communication field, the importance of the display device for displaying various kinds of information is increasing, and the cathode ray tube, which is one of the existing display devices, has certain limitations. I could not meet. As a flat panel display, a liquid crystal display (LCD), a plasma display panel (PDP), and an electroluminescence display (ELD) have been developed to meet expectations, and research and development are actively conducted. It is becoming.

Among such display devices, the liquid crystal display device is a display device having advantages such as light weight, thinness, and low power. Due to these advantages, the liquid crystal display device is widely used not only for display devices such as notebook computers, but also for desktop computers and large TVs, and the demand for this is continuously increasing.

1 is a perspective view illustrating a conventional liquid crystal display.

In general, a liquid crystal display (Liquid Crystal Display) is a liquid crystal panel (10; Liquid Crystal Display Panel) that displays an image by filling the liquid crystal having optical anisotropy between the two substrates and changing the orientation according to the electrical signal, and the liquid crystal panel ( And a backlight unit 20 for supplying light to the liquid crystal panel 10. This is because the liquid crystal display does not emit light and thus requires a backlight unit 20 which is a separate device for irradiating light to the liquid crystal panel 10. In addition, the liquid crystal display device presses the main support 27 for bonding and supporting the liquid crystal panel 10 and the backlight unit 20 from the side and the upper edge of the liquid crystal panel 10 while pressing the main support 27. It is configured to include a top case 25 (top case) and a cover bottom (29) for supporting the backlight unit and positioned below the top case (25) coupled to the.

The backlight unit used as the light source of the liquid crystal display device is classified into a direct type and an edge type according to a method of disposing a light emitting lamp. The direct type backlight unit is applied to a relatively large liquid crystal display device, whereas the edge type is applied to a relatively small liquid crystal display device, and FIG. 1 shows a liquid crystal display device having the direct type backlight unit 20. It is shown. As shown in the direct type, a plurality of lamps 21 are arranged in parallel as a light source, a reflecting sheet 22 is disposed under the plurality of lamps 21, and a plurality of lamps 21 are disposed above the plurality of lamps 21. A plurality of optical sheets 23 are stacked and positioned. 2 is a cross-sectional view of such a direct type backlight unit.

However, in recent years, since the liquid crystal display device is becoming more and more large in size, the length of the lamp is also increasing in proportion. As such, when the length of the lamp is increased, a phenomenon in which the middle portion of the lamp is bent in the direction of gravity due to gravity may occur, in which case the non-uniform luminance distribution is exhibited, thereby degrading the quality of the liquid crystal display device. In addition, the width of the optical sheet including the optical sheet, etc. is also increased in proportion to the size of the liquid crystal display device, and even if the outer portion is fixed to the frame, bending may occur due to gravity of the center portion of the liquid crystal panel. This also brought about a deterioration of the quality of the liquid crystal display device. Therefore, the prior art has been equipped with a lamp guide that can fix the lamp and support the optical sheet.

3 is a cross-sectional view illustrating a lamp guide 30 capable of simultaneously fixing a lamp and an optical sheet according to the prior art. As shown, the holder 31 is fixed to the lamp and the fixing support 32 is shaped to support the optical sheet 23 provided on the upper portion of the lamp. The lower part of the lamp is equipped with a reflector plate 22 for increasing the efficiency of light emitted from the lamp and a cover bottom 29 for supporting the backlight. The optical sheet 23 on the lamp includes a diffusion sheet, a prism sheet, a protective sheet, and the like for diffusing light emitted from the lamp. A lower portion of the lamp guide 30 is provided with a fastening portion 35 to fix the lamp guide 30 to the cover bottom 29.

4A, 5A, and 6A are perspective views illustrating a conventional lamp guide, and FIGS. 4B, 5B, and 6B are cross-sectional views taken along line II ′, II-II ′, and III-III ′ in sequence.

In the case of Figure 4 is a fastening portion of the lower portion is formed in parallel with the connecting plate portion of the lamp guide, and the lamp guide is rotated on both ends of the fastening jaw 39 so as to engage with the cover bottom 29 shows a way to fasten with the cover bottom (29) . In this case, a hole 40a through which the fastening part 35a of the lamp guide can be inserted is formed in the cover bottom 29, and then the fastening part 35a of the lamp guide is inserted into the hole 40a. Then, the fastening part 35a is rotated and fixed to the locking step 39. In the illustrated cross-sectional view, since the lamp guide is rotated and fastened to the center, only a portion of the hole 40a into which the fastening part is inserted is shown in the cross-sectional view, but a fastening hole is formed as long as the length of the fastening part in a different direction. Therefore, after the fastening portion 35a of the lamp guide is locked to the locking jaw 39, the fastening portion 35a of the lamp guide is staggered with the fastening hole 45a of the cover bottom 29, and the cover bottom 29 An extra empty space is left for inserting the fasteners in the cable, causing light leakage.

As shown in FIG. 5, in the case of a fastening method made of a hook type, a fastening hole 40b into which the hook-shaped fastening part 35b can be inserted must be formed in the cover bottom 29 and the hole 40b. After the fastening part 35b is inserted into the fastener, it is fastened in a predetermined direction. Since the fastening holes are subsequently covered by the horizontal plate 37 of the lamp guide, light leakage may occur since the cover bottom 29 does not exist. That is, the cover bottom 29 is often formed of an opaque material and there is a blocking effect of light leakage, but the fastening holes 40b are drilled in the fastening portions 35b and 40b, and the portion thereof is without the cover bottom 29. It is only covered by the lamp guide to reduce the blocking effect of light leakage.

There is also a problem in the case of another hook type fastening structure shown in Figs. 6A and 6B. 4A, 4B or 5A, 5B, the structure of the lamp guide is made so that the insertion hole 35c of the cover bottom 29 is minimized so as to minimize light leakage. After the fastening portion 35c is inserted into the fastening hole 40c, it is coupled in the form of spreading wide. At this time, the fastening portion 35c of the lamp guide cannot be caught in the fastening hole 40c. However, even in this structure, an empty space is generated between the fastening hole 40c of the cover bottom 29 and the fastening part 35c of the lamp guide, which may cause light leakage. In addition, in the case of the present invention, the flesh thickness of the hook support is weaker than other lamp guides, so that the fixing force of the lamp guide becomes weak after assembly and easily falls into an impact.

As described above, all of the fastening structures according to the related art have a problem that light leakage occurs due to fastening holes formed in the cover bottom.

The present invention is to solve the above problems in the lamp guide for supporting and fixing a plurality of lamps, by fastening the lamp guide to the cover bottom by forming a fastening portion in the screw bottom and at the same time prevent the flow of the lamp guide And it is an object of the present invention to provide a backlight and a liquid crystal display device having a lamp guide that is not easily released by the impact applied from the outside.

A liquid crystal display device having a lamp guide according to the present invention includes a liquid crystal panel; A cover bottom positioned below the liquid crystal panel and having at least one fastening hole; A lamp guide having a fastening part screwed into the fastening hole of the cover bottom and at least one lamp holder; And at least one lamp fixed to the lamp holder to supply light to the liquid crystal panel.

The lamp guide includes at least one lamp holder for fixing and supporting the lamp and an extension of a horizontal plate formed in parallel with the cover bottom at one side of the lamp holder; A screw-type fastening part formed on a rear surface of one side of the horizontal plate and engaging with the cover bottom; And fastening protrusions formed on an extension of the horizontal plate and present on one or both sides of the screw-type fastening protrusions.

At this time, one side of the extension of the horizontal plate of the lamp may include a triangular pyramid-shaped fixing support.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 7 and 8 to describe the present invention. In the embodiment according to the present invention, parts having the same shape and the same function have the same reference numerals.

7 is a perspective view showing an embodiment of a lamp guide according to the present invention, Figure 8 is a cross-sectional view showing a backlight according to an embodiment. The lamp guide 130 includes a lamp holder 131 and a horizontal plate 137 which fix and support a lamp on the upper side of the horizontal plate 137 around the horizontal plate 137 formed to be fastened in parallel with the cover bottom 129. The lower portion of the cover bottom 129 is configured to include a fastening portion 135 formed vertically for coupling.

An optical sheet 123 such as a diffusion sheet, a prism sheet, and a protective sheet is provided on the lamp guide 130 and the upper part of the lamp 121 to increase the efficiency of the light emitted from the lamp 121. Although not shown, a liquid crystal panel is provided on the optical sheet 123.

The horizontal plate 137 of the lamp guide is positioned in parallel with the cover bottom 129 when it is combined with the cover bottom and is firmly fixed in contact with the cover bottom 129 and the reflecting plate 122 thereon. The horizontal plate 137 may extend long to include at least one lamp holder 131. The lamp holder 131 may exist above the elongated horizontal plate 137 and may fix and support a plurality of lamps 121. The length of the extension portion of the horizontal plate 137 may be configured according to the number of lamps 121, the area of the backlight, and the like.

The horizontal plate 137 is in contact with the bottom of the cover bottom 129, precisely the reflecting plate 122 of the top of the cover bottom 129, if there is a hole in the cover bottom 129 and the reflecting plate 122 to prevent it Role. Since the lamp 121 is for supplying light to the liquid crystal panel (not shown), light emitted from a direction different from the liquid crystal panel in the lamp 121 is reflected by the reflection plate 122 in the liquid crystal panel direction. In order to increase the efficiency of light emitted toward the liquid crystal panel, the lamp guide 130 may also have a material that reflects light or at least does not absorb light. Therefore, the lamp guide 130 may be provided in white. However, when the horizontal plate 137 itself is not a completely opaque material, light leakage may occur when there is a hole in the cover bottom 129 or the reflective plate 122. Hereinafter, the light leakage may be prevented according to the exemplary embodiment of the present invention.

The lamp holder 131 of the lamp guide 130 is formed so that one side is opened to accommodate the lamp 121 is inserted. The opened portion of the lamp holder 131 is easy to fasten but is narrowed toward the inside so as not to be easily separated. Since the lamp 121 is to be fixed, the part fixing the lamp 121 has the same shape as that of the lamp 121. Since most lamps have a circular shape, the fixing part of the lamp holder is often circular. Since the lamp holder 131 should not obstruct the lamp 121 as much as possible for the light efficiency of the lamp 121, the width of the lamp holder 131 in the direction in which the lamp 121 is mounted is preferably narrow. However, the width may have the minimum width necessary for fixing or supporting since the lamp must be fixed and supported at the same time. In addition, since the lamp holder 131 is preferably fixed to the lamp 121 at regular intervals may be provided with a constant separation distance.

As shown in FIG. 7 and FIG. 8, a fastening part 135 that can be coupled to the cover bottom 129 is formed at the lower part of the lamp guide. The fastening protrusion is formed perpendicular to the bottom of the horizontal plate (137). In the existing invention, the fastening portion was formed in the form of a hook or the like below the horizontal plate 137, but in the present invention has a screw-type fastening portion 135 as shown. In this case, the screw-type fastening portion has a screw thread at regular intervals in the form of a male screw.

Correspondingly, the cover bottom 129 is provided with a fastening hole 140 corresponding to a female screw corresponding to the thread of the fastening portion 135 of the lamp guide. 9 is a perspective view showing a cover bottom according to an embodiment of the present invention. The fastening hole 140 corresponding to the female screw of the cover bottom 129 has a groove corresponding to the thread of the fastening part of the lamp guide, and thus, two screws overlap to form a screw when they are coupled. Therefore, the fastening portion 135 of the lamp guide is formed in the shape of a male screw and is fitted into the fastening hole 140 corresponding to the female screw of the cover bottom 129 to be fastened. At this time, the fastening portion 135 of the lamp guide is inserted into the fastening hole 140 of the cover bottom to rotate along the screw thread and is fastened to the cover bottom 129 through such rotation.

When the fastening part 135 of the lamp guide corresponding to the male screw and the female thread and the fastening hole 140 of the cover bottom 129 are combined, the fastening part and the fastening hole are correctly fitted so that nothing is coupled to the cover bottom 129. There is no open hole left. That is, in the exemplary embodiment of the present invention, there is no part in the cover bottom 129 that may cause light leakage. In the present invention, only the portion where the lamp guide and the cover bottom are coupled precisely has a fastening structure, and there is no extra fastening hole or other space after the fastening is completed, thereby minimizing light leakage. In addition, since the horizontal plate 137 or the extension plate is present in the upper portion of the fastening part 135, there is little room for light leakage due to the thickness in the vertical direction.

The fastening part 135 of the lamp guide may be formed anywhere on the horizontal plate 137 or an extension thereof. However, since the fastening part 135 is a screw type, the lamp guide may be rotated and coupled. Therefore, one fastening portion 135 is present in the lamp guide. The fastening part 135 may exist in the middle of the horizontal plate of the lamp guide. When the horizontal plate is extended and formed or includes a plurality of lamp holders or fixing supports, it is preferable that the horizontal plate is present in the middle of the horizontal plate to fix the lamp guide more firmly. However, various configurations such as the size of the cover bottom 129 and the position of the lamp 121 are possible, so that it is possible to form the horizontal plate 137 or one side of the extension part accordingly.

The lamp guide should be formed to secure the lamp 121 or other members without covering the reflector 122 as much as possible. Therefore, the fastening part 135 may be changed in position depending on various factors such as the fixing position of the lamp or the size or shape of the liquid crystal panel, but may be formed under the fixing support or the lamp holder 131. This is because the lamp 121 or the optical sheet 123 can be effectively fixed and supported, and since the lamp holder 121 or the fixing support side is loaded with a lot of force even during an impact, it may help to fix the lamp 121 or the optical sheet 123. . That is, the part of the fixed support or lamp holder is made thicker part of the lamp guide for fixing or support, so when the fastening part is connected to this part, a more rigid coupling is possible.

In the case of the lamp guide according to the embodiment of the present invention, since the fastening part 135 is in the form of a screw, the lamp guide is rotated to be fastened. In this case, depending on the angle of rotation or the degree of rotation, there is a possibility that it may not be fixed at the correct position when fastening, and after the fastening, the lamp guide may not be fixed by loosening the screw. Therefore, when the lamp guide is formed by the present invention includes the other fastening portion that can be fixed firmly finally after the lamp guide is rotated.

The other fastening part is to make a fastening groove 160 to be coupled to the fastening protrusion 150 in the lamp guide and the cover bottom 129 to be fastened to the lamp guide and the cover bottom 129. The fastening groove 160 of the cover bottom 129 is illustrated in FIG. 9. When the lamp guide is coupled to the cover bottom 129, when the fastening part 135 fits into the fastening hole 140 of the cover bottom 129 and rotates to an appropriate degree when turned, the fastening protrusion 150 and the fastening groove 160 are rotated. The fastening protrusion 150 and the fastening groove 160 may be formed so that the positions of the cations coincide with each other. The fastening protrusion 150 may be formed at a lower distance from the fastening portion 135 at the bottom of the horizontal plate 137. Therefore, the fastening protrusion 150 is rotated about the fastening portion 135 and the path in which the fastening protrusion 150 is in the form of an arc or a circle around the fastening portion. The fastening protrusion 150 rotates by inserting the lamp guide into the fastening hole 140 to rotate in a circular arc or circle, and stops the rotation by seating on the pre-formed fastening hole 160.

The fastening protrusion 140 may be formed below the horizontal plate 137 of the lamp guide, that is, on the rear side of the lamp holder 131. Since the lamp guide should be coupled to the cover bottom (and the reflecting plate), it is formed below the horizontal plate 137. The fastening protrusion 150 is formed convexly toward the cover bottom 129 and may have various shapes but may be made hemispherical in shape. Fastening grooves 160 to the fastening protrusions 150 may be easily coupled and difficult to separate. Therefore, the coupling protrusion 150 can be easily slipped into the coupling groove 160 at the time of coupling and can be manufactured in a hemispherical shape with difficulty in coming out again after coupling. However, even if it is not hemispherical, it is possible to fasten and fasten easily after joining, other types of fastening protrusions or fastening grooves are also possible. At this time, the fastening groove has a shape that can be engaged with the fastening protrusion. The fastening protrusion and the fastening groove is the same as the shape of the coupling portion is preferably fixed to the coupling portion is the same shape with each other one form of iron (凸) can be formed in the shape of yaw (凹).

These fastening protrusions can be formed at one or both sides of the horizontal plate or a portion of the horizontal plate extending from the fastening portion at one interval. In this case, the fastening protrusion 150 may be formed in the lamp guide and the fastening groove 160 may be formed in the cover bottom 129, but vice versa. That is, the fastening protrusion may be formed on the cover bottom and the fastening groove may be formed on the lamp guide. If the lamp guide is formed to form a fastening protrusion and a groove so as to be coupled to the cover bottom, one side may be a variety of arrangements, such as a protrusion type any other side groove.

 When the fastening protrusion 150 and the fastening groove 160 are formed and fastened as described above, the fastening protrusion 150 and the fastening groove 160 are coupled once more to secure the lamp guide. The fastening protrusion and the fastening groove may have various shapes. In this embodiment, but the hemispherical fastening protrusion and the fastening groove to be coupled thereto is made, any form can be fixed and fitted. The fastening protrusions may be formed on the lower part of the horizontal plate of the lamp supporter or the lower part thereof. The fastening protrusion and the fastening groove may be formed in various ways depending on the number or position of the lamp holder or the fixing support.

In the above description, the lamp and the reflector for reflecting light in the direction of the liquid crystal panel between the lamp guide and the cover bottom are not described, but may be formed under the lamp guide to form a fastening groove like the shape of the cover bottom.

As described above, a horizontal plate 137 is formed in the lamp guide perpendicular to the direction of the lamp holder 131. When the cover bottom 129 and the lamp holder 131 are coupled to each other, the cover bottom 129 is fixed to the cover bottom 129 to stably fix the cover bottom 129. If there is a possibility of occurrence, there is a purpose to prevent it. It can be attached to this horizontal board 137 or the place which extended the horizontal board etc. by adding the holder etc. which perform another function. For example, the fixing support 132 for supporting the optical sheet 123 may be formed together.

10 is a cross-sectional view showing one embodiment of the present invention, and further includes a fixing support 232 for fixing the optical sheet. As shown, the conical fixed support 232 is coupled vertically upward of the horizontal plate 237. The fixing support 232 is for fixing the optical sheet 223 such as diffusion sheet, prism sheet, protective sheet for the efficiency of light supplied to the liquid crystal panel. Although the lamp guide has two lamp holders 231 and one fixing support 232 mounted therein, the horizontal plate 237 may be extended to install a plurality of lamp holders and the fixing support.

It is also possible to have a member holder for fixing another member. Other optical members may be coupled to the lamp guide to maximize the light efficiency of the backlight. In this case, therefore, the optical member holder for the optical member can be further combined. Such an optical member may include, for example, a light diffusion medium.

The lamp guide may be integrally formed. Different parts can be made and combined, but they can be formed integrally to simplify the process of forming.

Referring to the drawings, a lamp guide having both an optical sheet fixing support and a lamp holder is shown. Various combinations may be possible, such as the absence of a fixed support and a plurality of fixed supports.

It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the spirit of the present invention. Therefore, the technical scope of the present invention should be defined by the scope of the claims rather than the details of the description.

The present invention is a lamp guide for supporting and fixing a plurality of lamps, by forming a fastening portion in the form of a screw it is possible to firmly fix the lamp guide to the cover bottom. In addition, the lamp guide is not easily moved and fixed, there is an effect that does not fall easily by the impact from the outside. Therefore, according to the present invention, a higher quality liquid crystal display device can be provided.

Claims (12)

A liquid crystal panel; A cover bottom positioned below the liquid crystal panel and having at least one fastening hole; A lamp guide having a fastening part screwed into the fastening hole of the cover bottom and at least one lamp holder; And And at least one lamp fixed to the lamp holder to supply light to the liquid crystal panel. The method of claim 1, The liquid crystal display device further comprises an optical sheet positioned above the cover bottom and the lamp to increase light efficiency. The method of claim 2, The lamp guide further comprises at least one fixing support for supporting the optical sheet. The method of claim 3, wherein The lamp guide is a liquid crystal display device, characterized in that the fastening portion is formed under the fixing support. The method according to any one of claims 1 to 4, The lamp guide has a fastening protrusion for fastening with the cover bottom, and the cover bottom further comprises a fastening groove fastened with the fastening protrusion. The method of claim 5, The fastening protrusion and the fastening groove are formed in an area corresponding to the lower portion of the lamp holder. A cover bottom having at least one fastening hole; A lamp guide having a fastening part screwed into the fastening hole of the cover bottom and at least one lamp holder; And And at least one lamp fixed to the lamp holder to generate light. The method of claim 7, wherein The backlight unit further comprises an optical sheet positioned above the cover bottom and the lamp to increase light efficiency. The method of claim 8, The lamp guide further comprises at least one fixing support for supporting the optical sheet. The method of claim 9, The lamp guide is a backlight unit, characterized in that the screw-shaped fastening portion is formed in the lower portion of the fixing support. The method according to any one of claims 7 to 10, The lamp guide has a fastening protrusion for fastening with the cover bottom, and the cover bottom further comprises a fastening groove fastened with the fastening protrusion. The method of claim 11, The fastening protrusions are formed in the area corresponding to the lower portion of the lamp holder.

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