KR101100215B1 - Light guide plate module and back light unit using the same - Google Patents

Abstract

The present invention relates to a light guide plate module and a backlight unit using the same, and more particularly, to a light guide plate and a light guide plate module for a backlight which can increase the amount of light emitted from the light guide plate. The present invention relates to a light guide plate module for a backlight, comprising: a light guide plate having a light incident portion at one end and a light distribution portion at the other end; A reflection plate positioned below the light guide plate; It is arranged along at least one side of the light guide plate, characterized in that it comprises a light source located on the light incident portion side of the light guide plate.

Light guide plate, backlight, light source, LED, module.

Description

Light guide plate module and back light unit using the same

The present invention relates to a light guide plate module and a backlight unit using the same, and more particularly, to a light guide plate module and a backlight unit using the same that can improve the amount of light emitted from the light guide plate or the backlight unit and the uniformity of the light.

A liquid crystal display (LCD) is a display device that can control a desired image by individually supplying data signals according to image information to pixels arranged in a matrix form and adjusting light transmittance of the pixels. Since it does not emit light, it is designed to display an image by installing a back-light unit on its back side.

Among such backlight units, LED backlight units using LEDs have been used in a direct array of LEDs. In the direct LED arrangement, the uniformity of the screen is maintained by controlling the light distribution of the LED through the lens design of the LED.

However, even when using a lens design that enlarges the light distribution, there is a limit in the spacing between the LEDs due to the limitation of the point light source LED. It is becoming. This is also a limiting factor in the slimming of the backlight unit.

The technical problem to be achieved by the present invention is to be able to manufacture a thin thickness of the backlight and to enable the divided driving while solving the optical problem using a light guide plate rather than a direct light source.

As a first aspect for achieving the above technical problem, the present invention is a light guide plate module for a backlight, comprising: a light guide plate having a light incident portion at one end and a light distribution portion at the other end; A reflection plate positioned below the light guide plate; It is arranged along at least one side of the light guide plate, characterized in that it comprises a light source located on the light incident portion side of the light guide plate.

As a second point of view for achieving the above technical problem, the present invention provides a backlight unit comprising: a light guide plate having a light incidence part at one end and a light distribution part at the other end; and a reflecting plate positioned below the light guide plate and adjacent to each other. A plurality of light guide plate modules arranged to be aligned with each other; It is arranged along at least one side of each light guide plate module, characterized in that it comprises a light source located on the light incident portion side of the light guide plate.

According to the present invention, the width of the upper surface of the light incident portion is designed to be smaller than the width of the lower surface of the light incident portion, thereby shifting the totally reflected light path to increase the amount of light emitted from the light guide plate.

In addition, LEDs can be placed between the light guide plates by sticking the entire display area into a small module type and using the same light guide plate regardless of the display size.

On the other hand, in this way, by modularizing the light guide plate to form a large screen by gluing the pieces in a tile method, it is possible to standardize the parts by allowing the same parts to be applied in various TV sizes in different quantities.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. However, it is not intended to be exhaustive or to limit the invention to the precise forms disclosed, but rather the invention includes all modifications, equivalents, and alternatives consistent with the spirit of the invention as defined by the claims.

It will be appreciated that when an element such as a layer, region or substrate is referred to as being present on another element "on," it may be directly on the other element or there may be an intermediate element in between .

Although the terms first, second, etc. may be used to describe various elements, components, regions, layers, and / or regions, such elements, components, regions, layers, and / or regions It will be understood that it should not be limited by these terms.

First Embodiment

As shown in FIG. 1 and FIG. 2, the light guide plate module 300 for a backlight consists of a light guide plate 310, a reflector 320 disposed on the lower surface of the light guide plate 310, and a light source 330.

In this case, a light emitting diode (LED) may be used as the light source 330, and the light guide plate 310 is provided with a light incident part 311 at a portion where the light of the LED 330 is incident, and the light incident part 311 is provided. At the other end of the light distribution unit 312 is located.

As illustrated, the light incident portion 311 may be formed to protrude laterally from the light guide plate 310, and the LED 330 may be located at an end of the light incident portion 311, and the LED 330 may include a circuit. May be arranged on the substrate 340.

In addition, the reflective plate 320 positioned below the light guide plate 310 may be positioned on the lower side of the light guide plate 310 and the lower side of the light distribution unit 312, and may be positioned to further surround the side surface of the light guide plate 310. .

The LED 330 and the circuit board 340 may be positioned on a first side of the light guide plate module 300 and a second side perpendicular to the first side. Thus, light of the LED 330 may be incident to the light guide plate 310 in two directions.

In this way, by protruding the light incident portion 311 long from the effective screen, it is possible to remove the dark portion due to the gap between the LED 330, and to prevent the direct exposure of light by the LED 330 at the seam between the light guide plate 310. Can be.

In addition, since the side of the light distribution part 312 of the light guide plate 310 is not completely blocked by the reflection plate 312, the light incident part 311 dark part generated as the shade due to the light incident part 311 is generated may be reduced. On the other hand, due to such a configuration, the side surface of the light distribution unit 310 is substantially smaller than the opposite surface located above the adjacent light receiving unit 311, the light distribution unit 310 side is adjacent to the light incident portion 311 By allowing the light to be exchanged in an optimal state with the opposing surface on the upper side of the upper side, it is possible to prevent the phenomenon that the boundary between the adjacent light guide plate 310 is visible.

3 and 4, a plurality of such modules 300 may be arranged on a plane to form a backlight unit. In this case, the light distribution unit 312 of the light guide plate 310 may have an entrance of an adjacent module 300. It is coupled to a position covering the light portion 311. This is to prevent the LED 330 located in the light incident part 311 of the adjacent module 300 from shining outside.

As such, the adjacent light guide plate 310 and the light guide plate 310 may be arranged to engage the light receiving unit 311 and the light distribution unit 312 to serve as the light guide plate 310 and to cover the LED 330. have. In other words, the LED 330 light is not directly exposed to the outside.

By such a configuration, the light emitted from the LED 330 proceeds along the side of the light guide plate 310 and is emitted to the upper side. In this case, the efficiency emitted by the reflector 320 may be improved. That is, the light emitted from the LED 330 travels along the side of the light guide plate 310 along the light incident portion 311, and at this time, the reflector 320 of the adjacent module 300 positioned above the light incident portion 311. This can help propagate light in this lateral direction. As such, the light traveling in the lateral direction is diffused in the light guide plate 310 and reflected by the reflector 320 to be uniformly emitted to the outside (upper side).

By arranging and installing the module 300 in a tile form, a large-sized backlight unit may be manufactured, and the backlight unit may be variously used for a TV, an electronic display panel, and the like.

5 to 7 show more specific examples of the module 300. FIG. 6 is a view viewed from the direction A of FIG. 5, and FIG. 7 is a view viewed from the direction B of FIG. 5, in which the LEDs 330 positioned on the circuit board 340 are in contact with the light guide plate 310 on one side thereof. The state is shown.

At this time, the reflecting plate 320 is located on the side surface as well as the lower side of the light guide plate 310, as shown in Figs. It is wrapped up. In some cases, the reflective plate 320 may be positioned in a folded state at least once on the side surface of the light guide plate 310.

The combination of such a module 300 is made as shown in FIGS. 8 and 9. That is, in the state where the LED 330 located on the circuit board 340 is coupled to the light incident part 311 of the light guide plate 310, the light distribution part 312 of the adjacent module is coupled to the light incident part 311. .

Therefore, as described above, the light distribution unit 312 of the adjacent module with the reflection plate 320 is located above the LED 330, the light of the LED 330 is not exposed to the upper side of the module, The light may be emitted through the side surface of the light guide plate 310 through 311 and may be emitted to the outside of the light guide plate 310.

FIG. 10 illustrates a backlight unit in which a plurality of backlight LGP modules 300 are arranged as described above.

That is, the circuit board 340 and the LED 330 which are provided at two sides with respect to each module 300 are disposed, and the light guide plate 310 and the reflector plate 320 are provided with a plurality of modules 300. It is provided to configure the backlight unit.

As such, the backlight unit manufactured by the individual modules 300 may be independently driven in some cases, and thus power consumption may be reduced by division driving.

As described above, the present invention utilizes an LED and a light guide plate that emit light in the lateral direction to reduce the thickness of the backlight unit. As the size of a display such as a TV or a monitor increases, a light guide plate may not be optically or thermally efficient due to a space limitation in which the LED can be placed when placing the LED on the entire screen and its surroundings. The size of the LED is placed on the side and the LEDs are connected to secure the amount of light and dissipate the heat. In particular, the LED located on the side of the light guide plate is optically hidden.

In addition, LEDs can be placed between the light guide plates by sticking the entire display area into a small module type and using the same light guide plate regardless of the display size.

On the other hand, in this way, by modularizing the light guide plate to form a large screen by gluing the pieces in a tile method, it is possible to standardize the parts by allowing the same parts to be applied in various TV sizes in different quantities.

Second Embodiment

11 shows a second embodiment of the light guide plate.

The backlight LGP module 300 includes a LGP 310, a back panel 350 disposed under the LGP 310, and a light source 330.

As shown, a plurality of modules 300 may be arranged on a plane to form a backlight unit, and the light distribution part 313 of the light guide plate 310 is coupled to a position covering a light incident part of an adjacent module 300. Will be. This is to prevent the LED 330 located in the light incident portion of the adjacent module 300 from shining outside.

At this time, the LED 330 is positioned at the lower portion of the connection portion, that is, the lower portion of the light distribution portion 313, in order to connect the light guide plate 310 of the module adjacent to the light guide plate 310 in a tile form. Therefore, a space must be secured for a portion where the LED 330 is located, and this space can be selected and used according to optical characteristics according to the light guide plate 310 structure.

That is, in FIG. 11, unlike the first embodiment, the light distribution part 313 has a triangular shape, and the LED 330 adjacent to the light distribution part 313 may be located. In this case, the LGP module 300 and the LED 330 may be mounted on one back panel 350 having a circuit instead of a separate circuit board.

Hereinafter, parts not described may be the same as in the first embodiment.

Third Embodiment

11 shows a second embodiment of the light guide plate.

The backlight LGP module 300 includes a LGP 310, a reflector 320 disposed on a lower surface of the LGP 310, a light source 330, and a circuit board 340 on which the light source 330 is installed. Is done.

As illustrated, a plurality of modules 300 may be arranged on a plane to form a backlight unit, and the light distribution part 314 of the light guide plate 310 is coupled to a position covering the light incident part of an adjacent module 300. Will be.

In this case, in order to connect the light guide plate 310 of the module adjacent to the light guide plate 310 in the form of a tile, the LED 330 is positioned under the connection part, that is, the lower part of the light distribution part 314. Therefore, a space must be secured for a portion where the LED 330 is located, and this space can be selected and used according to optical characteristics according to the light guide plate 310 structure.

12, the light distribution part 314 in contact with the adjacent module 300 may be inclined. In this case, the LED 330 may be disposed on a separate circuit board, and the reflector 320 and the back panel 360 may be positioned under the light guide plate.

Hereinafter, parts not described may be the same as the first embodiment or the second embodiment.

The above embodiment is an example for explaining the technical idea of the present invention in detail, and the present invention is not limited to the above embodiment, various modifications are possible, and various embodiments of the technical idea are all protected by the present invention. It belongs to the scope.

1 to 10 are diagrams showing a first embodiment of the present invention.

  1 is a side schematic view of a light guide plate module.

  2 is an exploded view of the light guide plate module.

  3 is a side assembly view of the light guide plate module.

  4 is an exploded view of the light guide plate module.

  5 is an exploded view of the light guide plate module.

  FIG. 6 is a view seen from the direction A of FIG. 5.

  FIG. 7 is a view seen from the direction B of FIG. 5.

  8 and 9 are schematic views showing the coupling of the light guide plate.

  10 is an exploded perspective view showing the coupling of each module.

11 is a side view showing a second embodiment of the present invention.

12 is a side view showing a third embodiment of the present invention.

Claims (13)

In the backlight unit, A plurality of light guide plates arranged adjacent to each other; A reflection plate provided on a lower side of the light guide plate; And And a light source in which a plurality of light emitting elements are arranged along at least one side of each light guide plate, wherein the light of the light source is emitted through an exit surface of the light guide plate, The light guide plate, A light incident part disposed on one side of the emission surface and extending from the emission surface of the light guide plate to a lower side; A first light coupling surface that is a vertical surface of a portion forming a step from the exit surface to the light incident portion side; A light distribution unit provided at the other end of the emission surface and coupled to an upper side of the light receiving unit of an adjacent light guide plate; And Located at the end of the light distribution portion, and comprises a second light coupling surface which is a vertical plane located opposite to the first light coupling surface, the second light coupling surface is partially blocked by a reflecting plate to the second light An area of the coupling surface is smaller than that of the first light coupling surface, and the plurality of light emitting devices are divided and driven. The backlight unit of claim 1, wherein the light emitting element is a light emitting diode. The backlight unit of claim 1, wherein the light source is arranged on a circuit board positioned along at least one side of the light guide plate. The backlight unit of claim 3, wherein the circuit board is located under the light incident part. delete The backlight unit of claim 1, wherein the reflecting plate is further positioned below the second light coupling surface. The backlight unit of claim 1, wherein a part of the second light coupling surface is blocked by a portion of the reflecting plate that is bent in the exit surface direction. The backlight unit of claim 1, wherein the reflector is further positioned on a side surface of the light guide plate. The backlight unit of claim 8, wherein the reflector is located at a portion of a lower side of the side surface of the light guide plate. The backlight unit of claim 1, wherein the light sources are arranged along two sides of the respective light guide plates. The backlight unit of claim 1, wherein a vertical width of the second light coupling surface is smaller than a vertical width of the first light coupling surface. The backlight unit of claim 1, wherein a bent part formed to have a step is positioned on a lower side of the light distribution part side of the light guide plate. The backlight unit of claim 12, wherein a portion at which the bent portion is positioned is a portion coupled to an upper side of the light incident portion of the adjacent light guide plate.

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