KR20060102357A - Liquid crystal display - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of tightly coupling a light guide plate to a main supporter and preventing light leakage.

According to an exemplary embodiment of the present invention, a liquid crystal display according to the present invention surrounds a backlight unit in which a reflection sheet, a light guide plate, and an optical sheet are sequentially stacked, and a surface of the side of the light guide plate and the main supporter that applies the corrosion portion draining from the rear surface of the light guide plate. A first section; And a section for applying a general subtraction gradient from the first section to an upper surface height of the light guide plate.

Description

Liquid Crystal Display {LIQUID CRYSTAL DISPLAY}

1 is a view schematically showing a cross section of a conventional liquid crystal display device.

FIG. 2 is an enlarged view of area A shown in FIG. 1.

3 is a schematic cross-sectional view of a liquid crystal display according to the present invention.

FIG. 4 is an enlarged view of region A ′ shown in FIG. 3.

<Description of Symbols for Main Parts of Drawings>

2, 22: main supporter 4, 24: reflection sheet

6, 26: light guide plate 8, 28: optical sheet

10, 16, 30, 36: polarizer 12, 32: lower substrate

14, 34: upper substrate

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of minimizing the dimensional deformation of the main supporter caused by the drainage of the corrosion portion during the formation of the corrosion surface of the main supporter.

A typical liquid crystal display (LCD) displays an image by adjusting the light transmittance of the liquid crystal using an electric field. To this end, the LCD includes a liquid crystal display module in which liquid crystal cells are arranged in a matrix, a driving circuit for driving the liquid crystal display module, and a case.

The liquid crystal display module includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form between two glass substrates, and a back light unit for irradiating light to the liquid crystal panel. In addition, in the liquid crystal display module, optical sheets for vertically raising the light traveling from the backlight unit toward the liquid crystal panel are arranged. The liquid crystal panel, the backlight unit, and the optical sheet must be fastened in an integrated form to prevent light loss and must be protected from damage by external impact. To this end, a case for a liquid crystal display device formed to surround a backlight unit and an optical sheet including an edge of a liquid crystal panel is provided.

1 is a view showing a cross section of such a liquid crystal display device.

Referring to FIG. 1, a liquid crystal display includes a backlight unit including a reflective sheet 4, a light guide plate 6, and an optical sheet 8 on a main supporter 16 made of plastic, a polarizer 10, and The liquid crystal panels 12 and 14 are sequentially stacked. To this end, the main supporter 2 is provided with stepped portions, and a case top (not shown) of the main supporter 2 is surrounded.

The reflection sheet 4 guides the light from the backlight unit toward the liquid crystal panels 12 and 14. The optical sheets 8 cause the light incident obliquely from the surface of the reflective sheet 4 to travel vertically toward the liquid crystal panels 12 and 14. In other words, the optical sheets 8 serve to raise the propagation direction of light from the surface of the optical sheets 8. The polarizing plates 10 and 16 function to extend the viewing angle of the image displayed by the liquid crystal cell matrix. Such a polarizing plate may be formed on either of the back surface and the display surface of the panel, or may be formed on both sides.

Liquid crystal cells (not shown) are arranged in the form of an active matrix between the upper substrate 12 and the lower substrate 14 of the liquid crystal panels 12 and 14, and switching video signals to each of the liquid crystal cells. Thin Film Transistor is installed. Since the refractive index of each of the liquid crystal cells is changed according to the video signal, an image corresponding to the video signal is displayed. On the lower substrate 12 of the liquid crystal panel, a tape carrier package (not shown) in which a drive integrated circuit for applying a driving signal to a thin film transistor is mounted is attached.

FIG. 2 is an enlarged view of a region A shown in FIG. 1 and illustrates a contact portion of a main supporter and a light guide plate side part.

Referring to FIG. 2, a corrosion surface for preventing M-Noise (Mechanical Noise) is displayed at a portion where the light guide plate 6 is coupled on the main supporter 2. M-Noise is caused by friction when force is applied to the contact area when the surface roughness or strength is different between two objects. Therefore, by forming the corrugated surface of the concave-convex shape on the contact surface between the two objects to prevent the M-Noise caused by friction while the support supporter 2 and the light guide plate 6 is slipped or rubbed. In this way, the corrosion on the main supporter 2 uses a mold that is symmetric to the corrosion surface. At this time, after the corrosion surface is secured by using a mold, a corroded drainage gradient is applied to facilitate the separation of the mold. The erosion draining tube is generally formed such that the side of the main supporter 2 has an inclination angle of 5 ° at the site where the side of the main supporter 2 is in contact with the side of the light guide plate 6.

Applying a 5 ° subtraction gradient in this way makes it easier to separate the mold and the main supporter 2, but one side of the main supporter 2 is formed differently from the design value. As a result, the main supporter 2 and the light guide plate 6 do not come into close contact with each other, and when the impact is applied to the panel, the light guide plate 6 may fall out, and light leakage may occur between the gaps.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of minimizing dimension changes while applying corrosion in bonding the main supporter and the light guide plate.

In order to achieve the above object, the liquid crystal display according to the present invention includes a supporter which surrounds a backlight unit in which a reflection sheet, a light guide plate, and an optical sheet are sequentially stacked, and the side of the light guide plate and the surface of the main supporter contact from the rear surface of the light guide plate. A first section for applying a corrosion drain removal gradient; And a section for applying a general subtraction gradient from the first section to an upper surface height of the light guide plate.

Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.

Referring to Figures 3 to 3 will be described a preferred embodiment of the present invention.

3 is a cross-sectional view of such a liquid crystal display device.

Referring to FIG. 3, the liquid crystal display includes a backlight unit including a reflective sheet 24, a light guide plate 26, and an optical sheet 28 on a plastic supporter main 22, and polarizing plates 30 and 36. ) And the liquid crystal panels 32 and 34 are sequentially stacked. To this end, the main supporter 22 is provided with stepped portions, and a case top (not illustrated) of the main supporter 22 is surrounded.

The reflection sheet 24 guides the light from the light source toward the liquid crystal panels 32 and 34. The optical sheets 28 cause the light incident obliquely from the surface of the reflective sheet 24 to travel vertically toward the liquid crystal panels 32 and 34. In other words, the optical sheets 28 serve to raise the propagation direction of light from the surface of the optical sheets 28. The polarizing plates 30 and 36 function to extend the viewing angle of the image displayed by the liquid crystal cell matrix.

Liquid crystal cells (not shown) are arranged in the form of an active matrix between the upper substrate 34 and the lower substrate 32 of the liquid crystal panel, and each of the liquid crystal cells includes a thin film transistor for switching a video signal. Film Transistor) is installed. Since the refractive index of each of the liquid crystal cells is changed according to the video signal, an image corresponding to the video signal is displayed. On the lower substrate 32 of the liquid crystal panel, a tape carrier package (not shown) in which a drive integrated circuit for applying a driving signal to a thin film transistor is mounted is attached.

4 is an enlarged view of a region A ′ shown in FIG. 3.

In FIG. 4, the main supporter 32 having a height of 5.75 mm of the main supporter 32 in contact with the light guide plate 36 is illustrated as an example.

Referring to FIG. 4, a corrosion surface for preventing M-Noise (Mechanical Noise) is displayed at a portion where the light guide plate 36 is coupled on the main supporter 32. The corroded surface includes a first section (I) applying the corroded portion drainage gradient from the back surface of the light guide plate and a second section (II) applying a general drainage gradient from the first section (I) to the top height of the light guide plate.

The first section I to which the corrosion portion draining gradient is applied is formed such that the side of the light guide plate 36 and the side of the main supporter 5 are inclined by 5 °. The first section I is formed at a height of 2 to 4 mm. The higher the height of the first section I, the easier it is to separate the main supporter 32 from the mold, but the actual length of the inner supporter 32 of the main supporter 32 becomes larger than the designed specification. Therefore, by adjusting the advantages and disadvantages, the height of the first section I is formed to a height of 2 to 4 mm. Preferably it is formed in the height of 3 mm.

The second section II to which the general drainage gradient is applied is formed such that the side surface of the light guide plate 36 and the side surface of the main supporter are inclined at 0.05 to 0.1 degrees. That is, it may be formed in parallel substantially.

As such, when the bush surface is formed by dividing the corroded portion and the general drainage section, the upper end of the main supporter 32 in contact with the side surface of the light guide plate 36 is 0.26 mm different from the actual design value. This can reduce the deviation of about 50% than the 0.5mm deviation occurs when applying a 5 ° subtraction gradient to the corrosion surface contacting the side of the light guide plate 36 and the main supporter 32. Accordingly, the gap between the light guide plate 36 and the main supporter 32 is reduced, so that the light guide plate 36 is less likely to fall even when an impact is applied to the panel, and the light leakage phenomenon is caused by the gap between the light guide plate 36 and the main supporter 32. You can prevent it.

As described above, the liquid crystal display according to the present invention reduces the gap between the light guide plate and the main supporter, thereby reducing the possibility of the light guide plate falling off even when an impact is applied to the panel and reducing the occurrence of light leakage due to the gap between the light guide plate and the main supporter. .

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

In a liquid crystal display device surrounded by a supporter, which is a backlight unit in which a reflection sheet, a light guide plate, and an optical sheet are sequentially stacked, The side of the light guide plate and the contact surface of the main supporter A first section for applying a corrosion portion draining back from the rear surface of the light guide plate; And a section for applying a general subtraction gradient from the first section to an upper surface height of the light guide plate. The method of claim 1, The first section is a liquid crystal display, characterized in that 2 ~ 4mm. The method of claim 1, And the side surface of the light guide plate and the side surface of the main supporter are inclined at an angle of 5 °. The method of claim 1, In the general drainage gradient, the side of the light guide plate and the side of the main supporter are formed horizontally.

Images