KR100896093B1 - Back Light Unit Of Direct Type - Google Patents

Abstract

The present invention relates to a direct type backlight unit that is configured to separate the heat sink and the frame, so that each part can be stably and simply assembled.

The present invention is a heat sink that emits an elevated temperature to the outside according to the driving of a direct light emitting diode (LED), mounted on top of the heat sink, a LED formed of a printed circuit board with a plurality of direct LEDs Module, a reflector attached to the surface except for the direct type LED of the LED module so that the light emitted from the LED module is reflected to the front, the upper portion of the reflector to enhance the efficiency of the light emitted through the LED module and the reflector to the front An optical sheet coupled to the upper portion and a direct backlight unit including a frame having a guide rail formed at the upper portion, the lower end of each of the heat sink is coupled in a sliding manner.

Backlight Unit, Direct Type LED, Heat Sink, Frame

Description

Back light unit of direct type

1 is a partial cross-sectional view showing in detail the configuration of a direct type backlight unit for a liquid crystal display according to the present invention;

2 is a view showing an assembly process of a direct backlight unit for a liquid crystal display according to the present invention;

3 is a view illustrating another assembling process of a direct backlight unit for a liquid crystal display according to the present invention.

 * Explanation of Signs of Major Parts of Drawings *

1: LED 3: PCB

11: heat sink 13: LED module

15: reflector 17: optical sheet

21 frame 31 guide rail

33: guide surface 35: fixed surface

37: slope

The present invention relates to a backlight unit unit for a liquid crystal display device, and more particularly, to a direct type backlight unit capable of stably and simply assembling each part by disassembling the heat sink and the frame.

Recently, with the rapid development of the information society, the necessity of a flat panel display device having excellent characteristics such as thinness, light weight, and low power consumption has emerged. Among these, liquid crystal display devices are excellent in resolution, color display, image quality, and so on. It is actively applied to monitors.

In general, a liquid crystal display device is formed by arranging two substrates on which electric field generating electrodes are formed so that the surfaces on which the two electrodes are formed face each other, injecting a liquid crystal material between the two substrates, and then applying a voltage to the two electrodes. By moving the liquid crystal molecules by an electric field, the device expresses an image by the transmittance of light that varies accordingly.

However, the liquid crystal display does not emit light by itself and merely controls a light transmittance, and thus requires a separate light source.

Therefore, an image is displayed by arranging a backlight on the back of the liquid crystal panel and injecting light from the backlight into the liquid crystal panel to adjust the amount of light according to the arrangement of the liquid crystals.

Such a backlight is divided into a direct method of directly dimming the entire surface of the substrate by placing a light source on the bottom of the liquid crystal panel and an edge method of reflecting and diffusing light by a light guide plate and a reflecting plate by placing the light source on one side or both sides of the liquid crystal panel. The direct method requires no light guide plate because light emitted from the lamp is directly emitted to the front of the liquid crystal panel, whereas the edge method requires a light guide plate for emitting light emitted from the side lamp to the front of the backlight. In general, the backlight used in notebook computers and LCD monitors adopts an edge method with low luminance unevenness, thin film shape, and low power consumption. Direct type backlights are also widely used in large screen liquid crystal displays because they have high light utilization, easy handling, and no limitation on the size of the display surface.

In the direct type backlight, a lamp, which is a linear light source, and a lamp receiving groove for supporting the lamp are included in the lamp supporters at both ends of the lower side of the lower plate, although not shown in the drawing. A plurality of supports are provided in the space between the lamps to prevent sagging due to high weight or high temperature of the upper sheets. A diffusion sheet, a prism sheet, a DBEF sheet (hereinafter referred to as DBEF) sheet, and a guide panel are sequentially disposed on the support to secure a desired viewing angle. The lower plate of the lamp is arranged in order to prevent the leakage of light and the lower plate which serves as the outer frame and the heat dissipation sequentially.

Efficient treatment of heat generated by lamps in the backlight affects the quality of the liquid crystal display element. In order to realize high luminance of the liquid crystal display device, the aforementioned direct type backlight is used. In the high brightness backlight structure as described above, heat is more seriously generated than an edge type backlight due to an increase in the number of lamps used. Heat generated in this way affects the image quality of the liquid crystal display device, which leads to limitations in use. Heat generated in the backlight generates afterimages and smears of the film, affects the change in the properties of the liquid crystal, and provides a cause of the decrease in brightness of the backlight itself.

Efficiently dissipating heat that causes the above problems in using the backlight has become an important problem, but there is a difficulty in efficient heat dissipation as a conventional backlight internal structure.

The technical problem to be achieved by the present invention is to provide a direct type backlight unit capable of assembling the heat sink and the frame in a separate type, which is stable and simple assembly for each part.

The present invention is a heat sink for emitting an elevated temperature to the outside according to the driving of the direct type LED, the LED module is formed on the upper portion of the heat sink, a printed circuit board with a plurality of direct type LED is emitted from the LED module Reflector plate attached to the surface except the direct type LED of the LED module so that the light is reflected to the front, optical sheet coupled to the upper part of the reflector plate and the upper part to be irradiated to the front to improve the efficiency of light emitted through the LED module and the reflector plate The optical sheet has a direct type backlight unit including a frame formed at the lower portion of the guide rail is formed so that the end of each of the heat sink is coupled in a sliding manner.

The heat sink is divided into first and second heat sinks to facilitate sliding coupling with the guide rail of the frame.

In addition, the frame is divided into first, second, third, and fourth frames to facilitate sliding coupling with the first and second heat sinks and the optical sheet.

In addition, the guide rails of the first, second, third, and fourth frames are formed at the inner side in the longitudinal direction of each frame in a 'c' side cross section.

In addition, the guide rail is more preferably formed to extend longer than the length of the upper guide surface constituting the guide rail to the inside of the guide rail.

In addition, any one frame selected from among the first, second, third, and fourth frames or two frames at positions facing each other may be assembled such that the upper guide surface of the guide rail formed on the upper frame is removed and only the lower fixing surface is present to form a step. In the process of assembly of the optical sheet can be easily assembled in a sliding manner.

More preferably, the inclined surface is integrally formed on the fixed surface of the guide rail formed on the upper part of the guide rail of the frame.

In addition, the reflector is perforated and through-coupled with the direct type LED of the LED module.

Further, it is more preferable that the reflection plate of the corresponding type is further attached to the inclined surface because the reflection efficiency can be improved.

(Example)

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is a partial cross-sectional view showing in detail the configuration of a direct type backlight unit for a liquid crystal display device according to the present invention, FIG. 2 is a view illustrating an assembling process of a direct type backlight unit for a liquid crystal display device according to the present invention. Another assembly process of the direct type backlight unit for a liquid crystal display according to the present invention is shown.

First, as shown in FIG. 1, the direct type backlight unit according to the present invention is mounted on a heat sink 11, an upper portion of the heat sink 11, which emits an elevated temperature according to the driving of the direct LED. LED module 13 formed of a printed circuit board 3 to which the direct type LED 1 is attached, and the direct type LED 1 of the LED module 13 so that the light emitted from the LED module 13 is reflected to the front. Reflective plate 15 attached to the surface except for, the optical sheet 17 coupled to the upper portion of the reflector 15 to be irradiated to the front to improve the efficiency of the light emitted through the LED module 13 and the reflecting plate 15 ) And an upper portion of the optical sheet 17, and a lower portion of the optical sheet 17 includes a frame 21 on which a guide rail 31 is formed so that the ends of each of the heat sinks 11 are coupled in a sliding manner.

2 and 3, the heat sink 11 is slid with the guide rail 31 of the frame 21. Referring to FIG. 2 and FIG. It is preferable to divide the first and second heat sinks to facilitate the coupling.
That is, the first and second heat sinks are slidably coupled to the guide rails 31 of the frame 21, respectively, and one end of each of the first and second heat sinks is in contact with each other to form the heat sink 11. Can be.

In addition, the frame 21 is divided into first, second, third, and fourth frames to facilitate sliding coupling with the divided first and second heat sinks and the optical sheet 17 to further facilitate the assembly process.

Here, as shown in FIG. 2, first, when the divided frames corresponding to the left and right sides of each of the divided first and second heat sinks are combined, and then the divided frames corresponding to the upper and lower sides are coupled to each other, the divided heat sinks are formed on the side. It is integrally coupled according to the sliding engagement with the combined divided frame.

At this time, the guide rails 31 of the first, second, third, and fourth frames are formed at the inner side in the longitudinal direction of each frame in a 'c' side cross section, which can be confirmed through a partial cross-sectional view of FIG.

In addition, the guide rail 31 has a length of the lower fixing surface 35 is formed longer than the length of the upper guide surface 33 constituting the guide rail 31 to the inside of the guide rail 31 is coupled to the heat sink After the combination with the (11) and the optical sheet 17, it is preferable that the length of the fixing surface 35 is formed to be longer than the length of the guide surface as a portion for supporting it is good support force.

In addition, any one of the first, second, third, and fourth frames 21, or two frames at positions facing each other, the upper guide surface 33 of the guide rail 31 formed on the upper frame is removed and the lower side It is preferable that only the fixing surface 35 is formed so that the stepped portion is formed so as to be more easily assembled in a sliding manner during the assembly of the optical sheet 17 in the assembling process.

Mounting the LED module 13 on the heat sink assembled in the above, and reflecting plate 15 on the surface except for the direct type LED 1 of the LED module 13 so that the light emitted from the LED module 13 is reflected to the front. ) Is attached. Here, the reflector 15 is perforated and penetrated to correspond to the direct-type LED 1 of the LED module 13, so that the light emitted from the direct-directed LED (1) is reflected to the maximum.

In addition, the inclined surface 37 is integrally formed on the fixed surface 35 of the guide rail 31 formed on the upper portion of the frame 21 of the guide rail 31 of the frame 21 to increase the reflection efficiency. More preferably, the inclined surface 37 is preferably attached with a reflecting plate 15 of a corresponding shape.

Here, the optical sheet 17 is slidably coupled to the upper portion of the reflector plate 15 so as to improve the efficiency of light emitted through the LED module 13 and the reflector plate 15 to be irradiated to the front side.

As described above, according to the present invention, an optical waveguide is applied between the light source and the flash lens of the mobile terminal to uniformly diffuse and deflect the light in the optical waveguide so that the light is emitted to the flash lens, thereby providing more light efficiency than the conventional flash module. There is an effect to be improved. And, there is an advantage that it is possible to form the irradiation angle in accordance with the angle of view taken by the camera for the same reason as described above.

Although the present invention has been described with reference to the above embodiments, it is merely illustrative, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (9)

A heat sink that emits an elevated temperature to the outside according to the operation of a direct light emitting diode (LED); An LED module mounted on an upper portion of the heat sink and formed of a printed circuit board to which a plurality of direct type LEDs are attached; A reflecting plate attached to a surface of the LED module except for a direct type LED to reflect the light emitted from the LED module to the front surface; Optical sheet coupled to the upper portion of the reflector to be irradiated to the front to improve the efficiency of the light emitted through the LED module and the reflector and And a frame having a guide rail formed at an upper portion thereof, and at a lower portion thereof, a guide rail coupled to a side of the heat sink in a sliding manner. The method according to claim 1, The heat sink includes first and second heat sinks disposed in parallel, The first and second heat sinks of the direct type backlight unit, characterized in that the one side is in contact with each other slidingly coupled to the guide rail of the frame. delete delete The method according to claim 1, The guide rail protrudes from the frame and includes a guide surface for supporting the lower portion of the heat sink and a fixing surface for supporting the upper portion of the heat sink, And the guide surface protrudes longer than the fixed surface. delete The method according to claim 5, And a sloped surface is further formed on the fixed surface in the frame. The method according to claim 1, wherein the reflecting plate, The direct type backlight unit is perforated through the corresponding direct type LED of the LED module. The method according to claim 7, And a direct type backlight unit further attached to the inclined surface.

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