KR20070033226A - Liquid Crystal Display - Google Patents

Abstract

An LCD is provided to prevent scratch generated on an optical sheet due to friction and wrinkle of the optical sheets due to heat or humidity by integrally forming a plurality of optical sheets and attaching the optical sheets onto a lower surface of an LCD panel. A light guide plate(30) is formed at one side of a lamp and converts light incident from the lamp into a surface light source. A plurality of optical sheets diffuse and condense light incident from the light guide plate. An LCD panel(80) is disposed above the light guide plate. The plurality of optical sheets are integrally formed, attached onto a lower surface of the LCD panel, and spaced apart from the light guide plate by a predetermined interval.

Description

Liquid Crystal Display {Liquid Crystal Display}

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

FIG. 2 is a cross-sectional view of the liquid crystal display of FIG. 1.

3 is a diagram illustrating a problem of a liquid crystal display according to the related art.

4 is an exploded perspective view of a liquid crystal display according to the present invention.

5 is a cross-sectional view of the liquid crystal display of FIG. 4.

* Description of the symbols for the main parts of the drawings *

10: lamp

20: reflector

30: Light guide plate

40: diffuser plate

50: first prism sheet

60: second prism sheet

70: protective sheet

80: LCD panel

90: mold frame

100: chassis

The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display capable of minimizing a defect caused by a difference in hardness between a plurality of optical sheets.

In general, the liquid crystal display (LCD) is expanding its application range due to features such as lightweight, thin, low-power drive, full-color, high-resolution implementation. Currently, LCDs are used in computers, notebooks, PDAs, telephones, TVs, and audio / video devices. Such a liquid crystal display device adjusts the amount of light transmitted according to an image signal applied to a plurality of control switches arranged in a matrix to display a desired image on a panel of the liquid crystal display device.

Since the liquid crystal display does not emit light by itself, a light source such as a backlight unit is required. The backlight unit is divided into a direct method of dimming the front surface of the panel by arranging a light source on one side of the panel and an edge method of reflecting and diffusing light to a light guide plate and a reflecting plate by disposing a light source on one side or a plurality of side surfaces of the panel. Lose.

1 is an exploded perspective view of a general liquid crystal display, and FIG. 2 is a cross-sectional view of the liquid crystal display of FIG. 1.

1 and 2, the liquid crystal display includes a lamp 1, a reflecting plate 2, a light guide plate 3, a diffusion plate 4, a first prism sheet 5, and a second prism sheet 6. ), A protective sheet 7 and a liquid crystal display (LCD) panel 8, a mold frame 9 and a chassis 10.

The visible light emitted from the lamp 1 proceeds to the light guide plate 3 having an inclined bottom surface. The bottom surface of the light guide plate 3 has a fine dot pattern for converting the traveling direction of the visible light to the LCD panel 8 side. Various patterns such as the above are printed, thereby reducing the light loss and guiding the light toward the upper surface together with the reflector 2. In this case, the light passing through the upper surface of the light guide plate 3 is not only light emitted vertically with respect to the upper surface, but also light emitted obliquely at various angles.

The diffusion plate 4 disperses the light incident from the light guide plate 3, thereby preventing the light from partially condensing, and an inclination angle of the light traveling to the first prism sheet 5 with respect to the first prism sheet 5. It also plays a role in reducing

The first prism sheet 5 and the second prism sheet 6 each have a triangular prism formed in a predetermined arrangement on an upper surface thereof, and are arranged to cross each other. The first prism sheet 5 and the second prism sheet 6 serve to condense the light diffused from the diffusion plate 4 in a direction perpendicular to the plane of the liquid crystal panel 8. The protective sheet 7 is disposed above the prism sheet, and serves to protect the prism sheet.

The LCD panel 8 and the plurality of optical sheets are housed in a mold frame 9 having a predetermined storage space therein, and a chassis 10 for fastening these components together and protecting them from external shocks is mounted. do.

On the other hand, looking at the material of the plurality of optical sheets, the light guide plate 3 mainly uses a polymethymethacrylate (PMMA), which is an acrylic resin, the diffusion plate 4 is mainly a polycarbonate (PC) or polyester (PET) resin The first prism sheet 5 and the second prism sheet 6 use polyester as the base substrate, and the prism part uses acrylic resin or the like, and the protective sheet 7 mainly uses polyester resin. use.

As discussed above, since the optical sheets are each made of different materials, the hardness of the optical sheets is different. Therefore, when an impact or vibration is applied to the liquid crystal display from the outside, the light guide plate 3, the diffusion plate 4, the first and second prism sheets 5 and 6 and the protective sheet 7 which are sequentially stacked are mutually stacked. Due to the friction and the hardness difference between the two, a problem occurs that a scratch or the like occurs in the sheet having a relatively low hardness. Such scratches lead to defects in which white spots occur when the liquid crystal display displays a screen.

3 is a diagram illustrating a problem of a liquid crystal display according to the related art.

Referring to FIG. 3, since the optical sheets are very thin films and have weak properties such as heat and humidity, when the lamp of the liquid crystal display is turned on, the optical sheets in a position adjacent to the lamp are due to heat generated from the lamp. Sheet wrinkles occur in the optical sheets. As a result, when the liquid crystal display is displayed, a problem arises in that the dark portion and the roster appear repeatedly.

The present invention is to overcome the above-mentioned conventional problems, the technical problem to be achieved by the present invention is to prevent the optical sheets are rubbed with each other by external vibration, etc., to prevent scratches in the optical sheet, the optical sheet by heat or humidity It is to provide a liquid crystal display device for preventing sheet wrinkles.

According to an aspect of the present invention for achieving the object of the present invention, a lamp;

A light guide plate formed on one side of the lamp and configured to convert light incident from the lamp into a surface light source; And a plurality of optical sheets for diffusing and condensing light incident from the light guide plate and an LCD panel disposed on the light guide plate, wherein the plurality of optical sheets are integrally formed and attached to a lower surface of the LCD panel. The liquid crystal display device is disposed spaced apart from the light guide plate by a predetermined interval.

The integrally formed plurality of optical sheets are attached to a lower surface of the LCD panel.

A polarizing film is disposed outside the LCD panel, and the plurality of optical sheets formed integrally are attached to the polarizing film.

The plurality of optical sheets may include a diffuser plate for diffusing light incident from the light guide plate, and a prism sheet for condensing the light diffused from the diffuser plate in a direction perpendicular to the LCD panel plane.

The plurality of optical sheets further comprises a protective sheet for protecting the surface of the optical sheet.

And a reflector for reflecting light incident from the lamp toward the LCD panel.

The reflecting plate may be disposed under the light guide plate.

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

4 is an exploded perspective view of a liquid crystal display according to the present invention, and FIG. 5 is a cross-sectional view of the liquid crystal display of FIG. 4.

4 and 5, the liquid crystal display includes a lamp 10, a reflecting plate 20, a light guide plate 30, a diffusion plate 40, a first prism sheet 50, and a second prism sheet 60. ), A protective sheet 70 and a liquid crystal display (LCD) panel 80, a mold frame 90, and a chassis 100.

The lamp 10 is mainly used a cold cathode tube, the light generated from the lamp 10 is incident through one side of the light guide plate (30).

The light guide plate 30 is formed of a plastic-based transparent material such as acrylic, so that the light generated from the lamp 10 is directed toward the LCD panel 80 seated on the upper portion of the light guide plate 30 via the top surface of the light guide plate 30. do. Various patterns, such as a fine dot pattern, are formed on the lower surface of the light guide plate 30 to convert the traveling direction of the light generated from the lamp 10 toward the LCD panel.

A reflecting plate 20 is formed on a lower surface of the light guide plate 30, and the reflecting plate 20 is not reflected by the minute dot pattern of light generated from the lamp 10 and traveling to the lower surface of the light guide plate. The light is reflected back to the upper surface of the light guide plate 30.

The diffusion plate 40, the first prism sheet 50, the second prism sheet 60, and the protective sheet 70 are integrally formed, and the plurality of optical sheets integrally formed with the light guide plate 30 are It is formed spaced apart by a predetermined interval. In the present embodiment, the plurality of optical sheets integrally formed are attached to the lower surface of the LCD panel, and are spaced apart from the light guide plate 30 by a predetermined interval.

As a result, even when an impact or vibration is applied to the liquid crystal display device from the outside, since a plurality of optical sheets are integrally formed, friction does not occur between the sheets, and scratches are not generated on the sheets having a relatively low hardness. do. In addition, since a plurality of optical sheets are integrally formed and attached to the lower portion of the LCD panel, sheet wrinkles can be prevented due to heat or humidity.

The diffusion plate 40 prevents light from being partially concentrated by dispersing the light incident from the light guide plate 30, and prevents the light from propagating toward the first prism sheet 50. It also reduces the angle of inclination for the vehicle.

Each of the first prism sheet 50 and the second prism sheet 60 has a triangular prism-shaped prism formed on an upper surface thereof, and the first prism sheet 50 and the second prism sheet 60 are formed. ) Prism arrays are arranged to be staggered with respect to each other. The first prism sheet 50 and the second prism sheet 60 collect light diffused from the diffusion plate 40 in a direction perpendicular to the plane of the LCD panel 80.

In this case, in order to reduce the thickness of the liquid crystal display, a single prism sheet having a predetermined shape may be used.

The protective sheet 70 is formed on the second prism sheet 60 to serve to protect the surface of the second prism sheet, and also to diffuse light in order to uniformize light distribution. do.

The LCD panel 80 is formed on the upper portion of the protective sheet 70, and the LCD panel 80 and the plurality of optical sheets are accommodated in a mold frame 90 having a predetermined storage space therein. The chassis 100 is mounted for fastening the elements together and protecting them from external shocks.

Although the liquid crystal display of the present embodiment has described the backlight unit according to the edge method, this is only an example for description, and is not limited thereto. The liquid crystal display device having the backlight unit according to the direct method or other methods is provided. Applicable to

What has been described above is merely an exemplary embodiment of the liquid crystal display device according to the present invention, and the present invention is not limited to the above-described embodiment, and as claimed in the following claims, it is beyond the scope of the present invention. Without departing from the scope of the present invention, those skilled in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

As described above, according to the present invention, by forming a plurality of optical sheets integrally and attaching such optical sheets to the lower surface of the LCD panel, the optical sheets are rubbed with each other by external vibration or the like, so that scratches occur in the optical sheets. It is possible to prevent sheet wrinkles due to heat and humidity.

Claims (6)

In the liquid crystal display device, lamp; A light guide plate formed on one side of the lamp and configured to convert light incident from the lamp into a surface light source; A plurality of optical sheets for diffusing and condensing light incident from the light guide plate; An LCD panel disposed on the light guide plate; The plurality of optical sheets are integrally formed and attached to a lower surface of the LCD panel, and are arranged to be spaced apart from the light guide plate by a predetermined interval. The method of claim 1, A polarizing film is disposed outside the LCD panel, and the plurality of optical sheets formed integrally are attached to the polarizing film. The method according to claim 1 or 2, The plurality of optical sheets, A diffusion plate for diffusing light incident from the light guide plate; And a prism sheet for collecting light diffused from the diffusion plate in a direction perpendicular to the LCD panel plane. The method of claim 3, The plurality of optical sheets further comprises a protective sheet for protecting the surface of the optical sheet. The method according to claim 1 or 2, And a reflector for reflecting light incident from the lamp toward the LCD panel. The method of claim 5, And the reflector is disposed under the light guide plate.

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