KR100628433B1 - Back light unit for liquid crystal display device - Google Patents

Abstract

The present invention relates to a backlight unit for a liquid crystal display device. In the present invention, the material of the lamp holder is changed to a light-transmissive material, for example, a transparent silicon material. In this case, the light rays output from both ends of the lamp can be incident on the light guide plate without any obstacles, and the light guide plate can transmit such light rays to the image panel as much as possible, so that the image information finally outputted to the image panel is different from the dark portion. Excellent image quality can be maintained without occurrence.

Description

Back light unit for liquid crystal display device

1 is an exemplary view showing a backlight unit for a liquid crystal display according to the present invention.

Figure 2 is an exemplary view showing the operation of the lamp holder according to the present invention.

The present invention relates to a backlight unit for a liquid crystal display device, and more particularly, to improve the material of the lamp holder, thereby preventing unexpected occurrence of dark areas, thereby greatly improving the image quality of the final output image. A backlight unit for a display device.

Recently, as the modern society becomes information socialized, the importance of the liquid crystal display, which is one of the information display devices, is gradually increasing.

In such a liquid crystal display device, in particular, the role and function of the backlight unit is becoming an important task. This is because the size and light efficiency of the liquid crystal display device vary depending on the structure of the backlight unit, so that the overall mechanical and optical characteristics of the liquid crystal display device are many. Because it is affected.

Conventional backlight structures for liquid crystal displays are described, for example, in US Pat. No. 55,670,42 "Reflector for flat panel display backlight unit", US Pat. (Backlighting arrangement for LCD display panel), US Patent No. 5608553 "Back light for liquid crystal display", US Patent No. 5640483 "Backlighting system using total internal reflection utilizing total internal reflection ".

In such a conventional backlight unit for a liquid crystal display device, a plurality of sheets are generally interposed between the front surface of the light guide plate and the image panel. Such sheets, for example, diffuse light emitted from the light guide plate, thereby causing brightness of light. Diffusing sheets for enhancing the optical density, prism sheets for condensing light from the light guide plate, and improving linearity brightness, and protective sheets for preventing damage of the diffusion sheets / prism sheets. The above-described image panel is disposed on the outermost surfaces of the sheets, and serves to display image information desired by the user to the outside.

At this time, one side of the light guide plate, for example, a long axis of the light guide plate, for example, a lamp used as a light source of the device, for example, a straight lamp is arranged in a row. Such a lamp has a structure surrounded by a lamp cover, and an opaque lamp holder is disposed at both ends of the lamp to hold the lamp, thereby assisting the lamp to maintain a stable mounting state at one side of the light guide plate. Perform the function. In this case, while the lamp is electrically connected to the inverter through a wire, the lamp is driven by the electrical energy input from the inverter, and a predetermined amount of light is incident on the light guide plate, so that the image information desired by the user can be quickly displayed through the image panel. To be possible.

Recently, as the light and short size of the liquid crystal display device is rapidly progressing, the long axis length of the liquid crystal display device tends to be gradually reduced, and accordingly, the long axis effective light emitting area of the image panel tends to be gradually expanded.

However, there are some serious problems in operating such a conventional backlight unit for a liquid crystal display.

As described above, as the light and short size of the liquid crystal display device is rapidly progressed, the long axis length of the liquid crystal display device tends to be gradually reduced, and accordingly, the long axis effective light emitting area of the image panel tends to be gradually expanded. In the conventional production line, the effective emission field of the lamp disposed on the long axis of the liquid crystal display device is maximized, so that the liquid crystal display device can flexibly cope with the expansion of the long axis effective light emission area of the image panel.

However, since the lamps arranged on the long axis of the liquid crystal display have a structure in which both ends thereof are held by lamp holders, and the lamp holders are made of an opaque material, the long axis effective light emission of the image panel in the conventional production line is achieved. This situation is inevitably suffered from the problem of dark areas at both ends of the region.

In order to suppress the occurrence of such a dark part, it is best to remove the lamp holder at both ends of the lamp, but in this case, since the mounting reliability of the lamp is greatly deteriorated, the conventional production line does not provide any countermeasures. .

In this way, when dark portions occur at both ends of the long-axis effective light emitting area of the image panel, the quality of the finally output image information is remarkably degraded, resulting in a serious problem that the overall function of the liquid crystal display device is remarkably degraded.

Accordingly, it is an object of the present invention to suppress the dark portion generated at both ends of the long-axis effective light emission area of the image panel to a range below a certain level without removing the lamp holder at both ends of the lamp.

Another object of the present invention is to suppress the occurrence of dark portions generated at both ends of the long-axis effective light emission area of the image panel, thereby improving the quality of the finally output image information, and eventually improving the overall function of the liquid crystal display device.

Still other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

In order to achieve the above object, in the present invention, the material of the lamp holder is changed to a transparent material, for example, a transparent silicon material. In this case, the light rays output from both ends of the lamp can be incident on the light guide plate without any obstacles, and the light guide plate can transmit such light rays to the image panel as much as possible, so that the image information finally outputted to the image panel is different from the dark portion. Excellent image quality can be maintained without occurrence. Of course, since lamp holders are mounted at both ends of the lamp, the lamp can maintain a stable mounting state continuously.

In this case, scattering beads, for example, acrylic or polycarbonate, are distributed in the lamp holder, and the scattering beads scatter light incident from the lamp in various directions, thereby increasing brightness of light emitted from both ends of the lamp. In addition, it is possible to maximize the "cancerous suppression effect" caused by the light transmittance of the lamp holder.

Hereinafter, a backlight unit for a liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, in the backlight unit 100 for a liquid crystal display according to the present invention, one side of the light guide plate 40 is provided with a lamp 11 used as a light source of the liquid crystal display, and such a lamp 11 ) Is wrapped by the lamp cover 10. At this time, the lamp 11 is connected to the connector (not shown) by a wire, and this connector supplies the lamp 11 with electrical energy of an appropriate voltage, thereby inducing the lamp 11 to emit light at a constant brightness. Play a role.

Here, the light guide plate 40 disposed on the side of the lamp cover 10 serves to convert the light of the line light source output from the lamp 11 into the light of the surface light source.

In this case, a plurality of reflective dots 41 are formed on the rear surface of the light guide plate 40 to diffuse light rays incident from the lamp 11. The reflecting dots 41 keep their size small in the area adjacent to the lamp 11 to induce a small amount of light diffusion, and maintain the size large in the area separated from the lamp 11 by The amount of light diffusion is induced to increase. In this case, the light guide plate 40 may maintain a uniform amount of light spread over its entire surface. As a result, the light beam output to the image panel via the light guide plate 40 may have uniform luminance across the entire surface of the light guide plate 40. Can be represented.

Here, a rear reflector (not shown) reflecting the light of the lamp 11 to the front of the light guide plate 40 is formed on the rear surface of the light guide plate 40 to be spaced apart from the light guide plate 40 by a predetermined distance. Sheets 50 are laminated in this manner.

Looking at the structure of these sheets 50 in more detail, first, a diffuser plate 51 for uniformly adjusting the light incident from the lamp 11 is formed on the surface closest to the light guide plate 40. In addition, a prism sheet 52 for improving the linear brightness of the incident light is formed on the front surface of the diffusion plate 51 in double. In general, since the prism sheet 52 is sensitive to scratches, a protective film 53 having a protective function is attached to the front surface of the prism sheet 52 to protect the prism sheet 52.

At this time, an image panel 2 for displaying information is placed on the front surface of the protective film 53 to perform a good image information display function. Each of the above components is stably stored in the storage space of the mold frame 1.

In the backlight unit of the present invention having the above-described structure, as shown in the figure, the lamp holder 30 for mounting stability of the mounting reliability of the lamp 11 is mounted on both left and right ends of the lamp 11, At this time, in the present invention, the lamp holder 30 is formed of a transparent material, for example, a transparent silicon material.

The change of the material of the lamp holder 30 forms the gist of the present invention. Of course, the conventional lamp is made of an opaque material at all differently.

In the conventional case, since the lamps have a structure in which both ends thereof are held by a lamp holder made of an opaque material, the lamps are disturbed in the transmission of light to be incident toward the light guide plate, and thus, unexpectedly dark areas at both ends of the image panel. Caused the problem to occur.

However, in the case of the present invention, as described above, since the lamp holder 30 mounted at both ends of the lamp 11 is made of a light-transmissive material, the lamp 11 has its own, as shown in FIG. The light beams output from both ends can be incident on the long axis plane A of the light guide plate 40 without any obstacles, and the light guide plate 40 can transmit all of these light beams to the image panel 2, thereby causing an image. The image information finally output to the panel 2 can maintain excellent image quality without generating dark parts. Of course, since the lamp holder 30 is attached to both ends thereof, the lamp 11 can maintain a stable mounting state even when an impact is applied from the outside.

When the present invention is achieved, the production line can ensure the maximum effective light emitting field of the lamp 11 disposed on the long axis of the liquid crystal display device to the maximum, whereby the finally completed liquid crystal display device is flexible to the recent light and short size reduction. A corresponding effect can be obtained.

At this time, as shown in the figure, the scattering beads 31 of, for example, acrylic or polycarbonate material is distributed in a powder form in the lamp holder 30.

Usually, since the above-described acrylic, polycarbonate, and the like are known as materials having excellent scattering properties, the scattering beads 31 having the acrylic and polycarbonate as materials are formed in a powder shape inside the lamp holder 30. In this case, the light rays output from both ends of the lamp 11 can obtain an additional effect of scattering in various directions by the action of these scattering beads 31. In this case, the light beams output from both ends of the lamp 11 are greatly increased in brightness, and as a result, the lamp holder 30 can maximize the "darkening generation suppression effect" based on its light transmittance to the maximum.

On the other hand, in the backlight unit 100 for a liquid crystal display device of the present invention having such a structure, first, the light irradiated from the lamp 11 is directly incident into the light guide plate 40 or reflected by the lamp cover 10 to the light guide plate. When incident on one side of the 40, the light guide plate 40 transmits the incident light to the diffuser plate 51 disposed on the front surface of the light guide plate 40.

At this time, as described above, since the lamp holder 30 mounted at both ends of the lamp 11 is made of a light-transmissive material, the image information finally output to the image panel 2 is excellent in image quality without the occurrence of a dark part. It can be induced to maintain.

Subsequently, the diffuser plate 51 transmits light incident from the light guide plate 40 to the prism sheet 52 disposed on its front surface, and the prism sheet 52 transmits light incident from the diffuser plate 51 to itself. Transfer to the protective film 53 is disposed in the front of the.

Thereafter, the passivation layer 53 transmits the light incident from the prism sheet 52 to the image panel 2 disposed on the front surface of the protective layer 53, thereby displaying the appropriate image information desired by the user on the liquid crystal panel 2.

As described above, in the present invention, by improving the material of the lamp holder and blocking the occurrence of unexpected dark portions, the image quality of the final output image can be greatly improved.

The present invention has an overall useful effect in all kinds of liquid crystal display devices manufactured in the production line.

And while certain embodiments of the invention have been described and illustrated, it will be apparent that the invention may be embodied in various modifications by those skilled in the art.

Such modified embodiments should not be understood individually from the technical spirit or point of view of the present invention and such modified embodiments should fall within the scope of the appended claims of the present invention.

As described in detail above, in the backlight unit for a liquid crystal display according to the present invention, the material of the lamp holder is changed to a light-transmissive material including a scattering agent, for example, a transparent silicon material. In this case, the light beams output from both ends of the lamp are increased in brightness so that they can be incident on the light guide plate, and the light guide plate can transmit such light beams to the image panel as much as possible, so that the image information finally outputted to the image panel is a dark part. It is possible to maintain excellent image quality without the occurrence of.

Claims (4)

A lamp for generating light; And A lamp holder coupled to the lamp to support the lamp, the lamp holder being formed of a transparent material to transmit the light generated from the lamp, and having scattering beads formed therein to scatter the light incident from the lamp; Backlight unit for liquid crystal display device. delete delete The backlight unit of claim 1, wherein the scattering beads are made of any one material selected from the group consisting of acrylic and polycarbonate.

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