KR100408194B1 - Light guide plate module in a liquid crystalline display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate module of a liquid crystal display device or an LCD device. The light guide plate module according to the present invention includes a light source, a diffuser for diffusing light emitted from the light source, and diffused light incident from the diffuser. A light guide plate module of a liquid crystal display device having a light guide plate leading to a panel, wherein the diffusion part is formed on a light incident surface of the light guide plate, and the light source is disposed adjacent to the diffusion part. In addition, the light guide plate prism surface of the light guide plate has a curved pattern.

According to such a configuration, it is possible to reduce the size and weight of the liquid crystal display device and to improve the brightness of the liquid crystal display while minimizing power consumption.

Description

Light guide plate module of liquid crystal display device {LIGHT GUIDE PLATE MODULE IN A LIQUID CRYSTALLINE DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light guide plate module used in a liquid crystal display (LCD), and in particular, integrates a light source and a diffuser into a light guide plate (LGP), and the light guide plate prism surface of the light guide plate. The present invention relates to a light guide plate module capable of improving luminance while minimizing power consumption as well as reducing the size and weight of a liquid crystal display device by improving the structure of the light guide plate module such as forming a curved line.

At present, a liquid crystal display (LCD) which displays an image as an optical signal output in accordance with liquid crystal alignment by application of an electrical image signal occupies an increasingly important position in the display device industry.

In particular, since LCDs are thin and light in comparison with other display devices, they have an absolute position as display devices such as notebook computers, mobile phones, MP3 players, PDAs, video cameras, digital cameras, watches, and TVs.

However, since the liquid crystal of the LCD has no light emitting capability, it cannot display an image by itself, and a separate light source must be provided to display the image. Further, the light from the light source is not directly irradiated to the liquid crystal, but is irradiated to the liquid crystal through additional optical components such as a light guide bar, a diffusion member, a light guide plate, and the like.

FIG. 1 schematically illustrates a model of a front light guide plate module of a conventional reflective liquid crystal display in which light source components are combined with a light source.

In the figure, reference numeral 10 denotes an LED as a light source, 11 a light guide bar, 12 a diffusion member, 13 a light guide plate, and 14 a liquid crystal panel.

As illustrated, the light source 10, the light guide bar 11, and the diffusion member 12 are installed at one side of the light guide plate 13, and the light source 10 is attached to one end of the light guide bar 11. The diffusion member 12 is disposed on the front surface of the light guide bar 11. In addition, the light guide bar 11 has a front surface formed in a predetermined surface pattern so that the outflowing light can be spread evenly, and the other surfaces except the front surface are configured to reflect light. On the other hand, the light guide plate 13 is formed with a reflective surface having a linear pattern so that light introduced into the light guide plate 13 can be incident on the liquid crystal panel 14.

Light emitted from the light source 10 and incident on the light guide bar 11 is reflected at the reflective surface of the light guide bar 11 and exits through the front surface, and is incident on the side surface of the light guide plate 13 through the diffusion member 12. 2 is a side view of a light guide plate module of a front part of a conventional reflective liquid crystal display, and shows a traveling path of light incident on the light guide plate 13.

As shown in the drawing, part of the light incident on the light guide plate 13 is directly incident on the liquid crystal panel 14 disposed on the rear surface of the light guide plate 13, and a part of the reflection surface of the linear pattern formed on the light guide plate 13 is applied. Reflected to the liquid crystal panel 14, and the remaining part flows out through the other side of the light guide plate 13. 3 is a front view of the light guide plate in which the traveling path of the light leaks in this way.

The light incident on the liquid crystal panel 14 is reflected by the lower reflective surface of the liquid crystal panel and is incident on the observer through the light guide plate 13 so that the viewer can see the liquid crystal screen.

As described above, the optical configuration of the conventional reflective liquid crystal display device includes the light source 10, the light guide bar 11, the diffusion member 12, and the light guide plate 13, so that light from the light source 10 is guided. The light is incident on the liquid crystal panel 14 through the bar 11, the diffusion member 12, and the light guide plate 13 sequentially.

However, the optical configuration of the conventional reflective liquid crystal display device has the following disadvantages.

First, a light guide bar 11 and a diffusion member 12 for guiding light to the light guide plate 13 are separately employed, and their lengths are similar to the length of the light guide plate 13, so that the volume and weight of the LCD device are large. Since it occupies a considerable part, it becomes an obstacle to light and small size of LCD device.

Second, since the light from the light source 10 passes through the light guide bar 11 and the diffusion member 12 in order to enter the light guide plate 13, the light passes through a plurality of incident surfaces, thereby causing light loss.

Third, when the light guide bar 11 and the diffusion member 12 for guiding light to the light guide plate 13 are not separately employed, the light guide plate prism face 15 of the light guide plate 13 is in a straight pattern, and thus the light guide plate 13 is formed. Since the distance from which the incident light reaches the reflective surface of the same line is different, the light reflected from the reflective surface of the light guide plate 13 is incident unevenly on the liquid crystal panel 14, and thus it is difficult to realize a high-quality liquid crystal screen. .

Fourth, since there is a light loss in the side surface other than the light incident surface of the light guide plate 13, the observability of a liquid crystal screen worsens, and light utilization efficiency also falls.

Therefore, by improving the conventional LGP module of the LCD device, there is a need for a new LGP module of an LCD device capable of providing a high-definition liquid crystal screen while maximizing the light utilization efficiency as well as reducing the size and weight of the LCD device.

The present invention is to solve the disadvantages of the light guide plate module of the conventional LCD device as described above, the object of the present invention is to exclude the light guide bar, to integrate the light source and the diffusion member to the light guide plate, and to curve the reflective surface pattern of the light guide plate By improving the structure of the light guide plate module in such a manner as to form, the light guide plate module can further improve the light and small size of the liquid crystal display device and improve the brightness of the LCD screen while minimizing power consumption.

In order to achieve the above object, the light guide plate module of the liquid crystal display device according to the present invention includes a light source, a diffusion portion for diffusing light emitted from the light source, and a light guide plate for guiding diffused light incident from the diffusion portion to the liquid crystal panel. In the light guide plate module of the liquid crystal display device provided with, wherein the diffuser is formed on the light incident surface of the light guide plate, the light source is arranged to be adjacent to the diffuser. In addition, the light guide plate prism surface of the light guide plate is characterized in that it has a spherical or optimized curve around the light source.

Preferably, the distance between the curved patterns of the light guide plate prism surface characterized by having a spherical surface or an optimized curve centered on the light source is formed to become narrower as it moves away from the light source.

Preferably, the reflecting portion is formed on the side surface of the light guide plate except for the light incident surface.

Preferably, a light source guide part is formed near the light incident surface of the light guide plate, and the light source is closely attached to the diffusion part through the light source guide part.

Preferably, the light incident surface of the light guide plate is formed in at least one of the corners of the light guide plate.

Preferably, the diffusion has a lenticular lens shape, a prism shape, or an embossed shape.

Preferably, the diffusion portion is interposed between the light source and the light incident surface of the light guide plate as a lenticular or prism shaped sheet.

Preferably, the diffusion portion is formed in a lenticular shape or a prism shape on the light source side.

1 is a schematic model diagram of a front light guide plate module of a conventional liquid crystal display device;

2 is a side view of a front light guide plate module of a conventional liquid crystal display device;

3 is a view showing the front light leakage of the front light guide plate module of the conventional liquid crystal display device;

4 is a schematic model diagram of a front light guide plate module of a liquid crystal display according to the present invention;

5 is an enlarged detailed view of an LED mounting unit of the LGP module of FIG. 4;

6 is a view showing side light progress of a light guide plate module of a front part of a liquid crystal display according to the present invention;

7 is a view illustrating side light leakage of a front light guide plate module of a liquid crystal display according to the present invention;

8 is an exemplary view illustrating a configuration of a diffusion part of a front light guide plate module of a liquid crystal display according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10, 20: light source (LED) 14: liquid crystal panel

11: light guide bar 15, 25: light guide plate prism surface

12: diffusion member

13, 21: light guide plate

22: light source guide

23: diffusion part

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described by taking a front light unit type reflective LCD device as an example.

FIG. 4 schematically illustrates a model of a front light guide plate module of a front light unit type reflective LCD device according to an embodiment of the present invention.

As shown in the figure, the light guide plate module according to the embodiment of the present invention does not include a light guide bar (11 in FIG. 1), and the diffusion member is conventionally provided separately, but in the present invention, instead of the diffusion member. The diffusion part 23 is integrally formed at at least one edge of the light guide plate 21, and the light source 20 is disposed adjacent thereto.

At this time, in order to facilitate the installation of the light source 20 in manufacturing the light guide plate module, the light source guide part 22 is formed at the corner of the light guide plate on which the diffusion part is formed. In performing the operation of integrating the light source 20 into the light guide plate 21 by the light source guide portion 22, the light source 20 is adjusted so that the light from the light source 20 is placed at the maximum position to be incident on the light guide plate 21. It can be mounted at the maximum light incidence position without trial and error and can be directly connected and fixed without additional materials such as adhesives or metal structures, thereby improving production efficiency.

In addition, although FIG. 4 illustrates that the light source 20 and the diffuser 23 are formed only at one edge of the light guide plate 21, the light source 20 and the diffuser 23 are not limited thereto. One or more may be formed at any position along the incident side of 21). For example, in the case of a small LCD device such as a mobile phone, it may be sufficient to form the light source 20 and the diffuser 23 at one or both corners on the incident surface side of the light guide plate 21, but may be relatively large, such as a notebook computer. In the case of the LCD device, a plurality of light sources 20 and diffusers 23 may be formed on the incident surface side of the light guide plate, including both corner portions.

As such, the number of light sources 20 and diffusers 23 disposed at the periphery of the light guide plate 21 of the light source 20 and the diffuser 23 is appropriate according to the size of the light guide plate 21, that is, the size of the liquid crystal panel. You can adjust it by number.

According to another embodiment of the present invention, the pattern of the light guide plate prism face 25 of the light guide plate 21 is not formed as a straight line as in the prior art but is formed in a curved shape. As described above, when the light guide plate prism surface of the light guide plate is straight, the light traveling distance to the same reflective line may be different in the case of an LED or a similar light source, so that light distribution to the liquid crystal panel through the light guide plate may be uneven. In order to solve this problem, the pattern of the light guide plate prism face 25 of the light guide plate 21 according to the present invention is developed in a substantially concentric manner with respect to the light source 20 formed on one side of the light guide plate 21. At this time, the distance between the curved patterns of the light guide plate prism face becomes narrower as it moves away from the light source 20, which is lighter than the side closer to the light source 20 in view of the weaker light intensity. In order to reflect more frequently from the far side, the light is evenly distributed throughout the liquid crystal panel.

As described above, according to the present invention, in the light guide plate module in which the light source 20, the diffusion part 23, and the light guide plate 21 are integrally formed, light emitted from the light source 20 may be directly incident to the light guide plate 21. Since the light path from the light source to the light guide plate is much shorter than in the conventional case, the light utilization efficiency, and thus the power consumption efficiency, can be greatly improved, and in particular, it contributes greatly to the thin and light reduction of the LCD device through the integration of optical elements. There is a huge advantage in this regard. Further, by curved the light guide plate prism surface of the light guide plate, it is possible to ensure uniform incidence of light into the liquid crystal panel and to improve the quality of the liquid crystal screen.

FIG. 5 illustrates an enlarged detail of a light source (LED) mounting portion of the LGP module of FIG. 4.

As shown in FIG. 5, the light emitted from the light source 20 diffuses into the light guide plate while passing through the diffuser 23 and is evenly spread throughout the light guide plate. This diffuser may be essential if the light source is an LED in particular because the LED has an elongated oval pattern of light output. That is, when the light output of the LED is incident on the light guide plate directly without passing through the diffuser, the light is difficult to spread throughout the light guide plate, so that the light is diffused using the diffuser to evenly reach the entire light guide plate.

6 is a side light progression of the front light guide plate module of the liquid crystal display according to the present invention, and FIG. 7 is a side light progression of the front light guide plate module of the liquid crystal display according to the present invention.

As illustrated in FIGS. 6 and 7, the reflector 24 is provided on the side of the light guide plate except for the light incident surface of the light guide plate 21. The reflector 24 receives light that is incident on the horizontal plane of the light guide plate from the light source 20 into the light guide plate 21 through the diffusion part and is emitted to the side of the light guide plate 21 again. By reflecting inside, it prevents the outflow of light and increases the amount of light incident on the liquid crystal panel to enable efficient use of light. The reflector 24 may be configured by attaching the reflective member to the light guide plate side or coating the light guide plate side with a reflector.

FIG. 8 illustrates some exemplary configurations of the diffusion part of the front light guide plate module of the liquid crystal display according to the present invention.

In FIG. 8, (a) shows a block lenticular lens formed on the light incident surface of the light guide plate 21 as a diffuser, and (b) shows a block lenticular sheet between the light source and the incident surface of the light guide plate. It shows what is interposed, and (c) shows that the block type lenticular lens was formed in the light source. Although (a), (b), and (c) show the block type lenticular shapes, the same effect will be obtained even when the concave lenticular shape is used.

(d), (e), and (f) show linear prisms formed on the light incidence plane of the light guide plate, linear prisms interposed between the light source and the incidence plane of the light guide plate, respectively, as the diffusion portions, and linear prisms formed on the light source.

Although not shown, the same diffusion effect can also be obtained by using an embossed pattern or a sheet composed of a diffusion agent as the diffusion portion.

Although the present invention has been described in detail by way of examples, it is intended to explain the nature of the present invention, and the scope of the present invention is not limited thereto. For example, the present embodiment has been described with respect to the light guide plate module of the present invention taking the front light type reflective LCD device as an example, the light guide plate module according to the present invention is not only the front light type transmissive LCD device but also the back light type transmissive LCD It can also be applied to the device. In addition, the light guide plate module according to the present invention is employed in a liquid crystal display device and can be widely used as a screen display device such as a small telephone, a PDA, a video camera, a portable computer, a mobile phone, an MP3 player, a digital camera, a clock, and a TV.

In addition, the integrated light guide plate module of the present invention can be variously modified and modified by those skilled in the art without departing from the spirit and scope of the present invention described in the claims, and such variations or modifications It turns out that it belongs to the scope of the present invention.

The light guide plate module of the present invention eliminates the light guide bar, integrates the light source and the diffusing member into the light guide plate, and improves the structure of the light guide plate module in such a manner as to form a reflective surface pattern of the light guide plate, thereby reducing the light and short size of the liquid crystal display device. In addition to further promoting the power consumption while minimizing the power consumption can improve the brightness of the LCD screen, it is possible to simplify the manufacturing process of the LCD device.

Claims (17)

delete delete delete A light guide plate module of a liquid crystal display device having a light source, a diffuser for diffusing light emitted from the light source, and a light guide plate for guiding diffused light incident from the diffuser to a liquid crystal panel, The diffusion part is formed on the light incident surface of the light guide plate, the light source is disposed adjacent to the diffusion part, Reflecting parts are formed on the side surfaces of the light guide plate except for the light incident surface, A light source guide part is formed near the light incident surface of the light guide plate, and the light source is closely attached to the diffusion part through the light source guide part, The light guide plate prism surface of the light guide plate has a curved pattern, The light guide plate prism surface is a spherical surface centering on a light source, The light guide plate of the light guide plate is formed on at least one of the corners of the light guide plate of the light guide plate module of the liquid crystal display device. The light guide plate module of claim 4, wherein the diffusion part has a cylindrical lens shape. The light guide plate module of claim 4, wherein the diffusion part has a prism shape. The light guide plate module of claim 4, wherein the diffusion part has an embossed pattern. The light guide plate module of claim 4, wherein the diffusion part is interposed between the light source and the light incident surface of the light guide plate as a lenticular sheet. The light guide plate module of claim 4, wherein the diffusion part is interposed between the light source and the light incident surface of the light guide plate as a prism-shaped sheet. The light guide plate module of claim 4, wherein the diffusion part is formed in a cylindrical shape on the light source side. The light guide plate module of claim 4, wherein the diffusion part is formed in a prism shape on the light source side. delete delete delete delete The light guide plate module of claim 4, wherein the light guide plate prism face has a curved shape in which light reflection efficiency is optimized. The light guide plate module of claim 4, wherein a distance between the curve of the light guide plate prism face and the curve becomes narrower as the light source moves away from the light source.