KR20070000855A - Liquid crystal display module which comprises means for preventing light leakage - Google Patents

Abstract

An LCD module is provided to prevent the leakage of light, which occurs around a hook for fixing a light guiding plate, thereby improving the picture quality, by disposing an optical sheet fixing member between an optical sheet and an LCD panel. A backlight assembly is positioned below an LCD panel. The backlight assembly includes a lamp for emitting a light, a light guiding plate(22) for guiding the light, and an optical sheet(24) laminated on the light guiding plate. The optical sheet is configured to condense or diffuse the light. An optical sheet fixing member(32) is formed between the LCD panel and the optical sheet. A support main(30) supports the LCD panel and the backlight assembly.

Description

Liquid crystal display module which comprises means for preventing light leakage

1 is an exploded perspective view of a typical liquid crystal display module

2 is a cross-sectional view of a typical LCD module;

3 is a partial perspective view showing the periphery of the hook protruding from the inner wall of the support main

Figure 4 is a cross-sectional view showing the laminated structure and the light leakage phenomenon around the hook

5 and 6 are a partial perspective view and a cross-sectional view showing a laminated structure showing the state that the pad is attached around the hook according to the first embodiment of the present invention

7 and 8 are a partial perspective view showing a state in which an optical sheet is fixed according to a second embodiment of the present invention and a cross-sectional view of a combination of a liquid crystal display module

9 is a cross-sectional view showing a state in which a step is formed on the bottom of the hook

* Explanation of symbols for main parts of drawings *

10: liquid crystal panel 11: liquid crystal panel drive cycle

12: lower polarizing plate 13: upper polarizing plate

20: backlight assembly 21: lamp

22: prism light guide plate 23: reflective sheet

24: optical sheet 24a: inverse prism sheet

24b: diffusion sheet 25: cutout

30: support main 32: hook

32a: step 40: top case

100: pad

The present invention relates to a liquid crystal display module (LCM), and more particularly to a liquid crystal display module that can prevent light leakage occurring near a hook of a support main for fixing a light guide plate. It is about.

In recent years, as the society enters the full-scale information age, the display field that visually expresses various electrical signal information has been rapidly developed, and various kinds of flat panel display devices have been developed. FPD) was introduced.

Specific examples of such a flat panel display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electroluminescent display device. (Electro Luminescence Display device: ELD), etc., which have excellent performances such as thinning, light weight and low power consumption, are rapidly replacing the existing cathode ray tube (CRT).

The liquid crystal display has a high contrast ratio, is suitable for moving picture display, and has low power consumption. Therefore, the liquid crystal display device is most actively used in the notebook, monitor, and TV fields.

As is well known, liquid crystals have a thin and long molecular structure, and have an optical anisotropy having an orientation in an array and polarization characteristics in which the arrangement direction of molecules changes depending on its size when placed in an electric field.

Accordingly, the liquid crystal display device includes a liquid crystal panel in which a pair of substrates having a transparent field generating electrode are formed on a surface facing each other with a liquid crystal layer interposed therebetween, and a backlight assembly for supplying light thereto. By controlling the electric field between the two field generating electrodes of the panel, the alignment direction of the liquid crystal molecules is artificially adjusted, and various desired images are displayed by using the difference in transmittance generated by passing the light of the backlight assembly thereto.

At this time, as a light source that generates light in the backlight assembly, a cold cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL) is used. A side light type that emits light from one edge of the rear side of the liquid crystal panel and then enters the front side of the liquid crystal panel using a light guide plate, and a plurality of fluorescent lamps are arranged on the back of the liquid crystal panel It is divided into a direct type that directly supplies light over the entire surface.

In addition, the liquid crystal panel and the backlight assembly are integrated into one module by using various fixing means, thereby minimizing light loss and protecting against impact.

FIG. 1 is an exploded perspective view of a general light metering type liquid crystal display module, and FIG. 2 is a view showing a part of a coupling section.

Referring to this, the liquid crystal display module largely supports the liquid crystal panel 10, a backlight assembly 20 that provides a light source under the liquid crystal panel 10, and integrally supports the liquid crystal panel 10 and the backlight assembly 10. The support main 30 having a rectangular frame shape, and the top of the top 40 is pressed against the edge of the liquid crystal panel while being fastened to the support main 30.

The liquid crystal panel 10 includes a thin film transistor as a switching element and an array substrate having pixel electrodes in a pixel region defined by gate wiring and data wiring, a color filter substrate including RGB and a color filter substrate having a common electrode, and the array. It includes a liquid crystal layer filled between the substrate and the color filter substrate.

On the other hand, the liquid crystal panel driver circuit 11 is connected to the side of the liquid crystal panel 10 via a flexible printed circuit board (FPCB), and the lower and upper polarizing plates 12 and the upper polarizing plate are respectively connected to the lower and upper portions thereof. 13) Combine this.

The backlight assembly 20 has a fluorescent lamp 21 installed at one side of the lower portion of the liquid crystal panel 10 and a side surface thereof is adjacent to the fluorescent lamp 21 to emit light emitted from the fluorescent lamp 21 through the upper surface. A prism light guide plate 22, an optical sheet 24 for condensing and diffusing light emitted upward through the prism light guide plate 22, and converting the light into a high quality uniform light source.

The prism light guide plate 22 has a plurality of prism acids having a fine triangular cross section at the bottom surface, and collects and diffuses the light emitted from the fluorescent lamp 21 to emit the light upwards. In order to uniformly emit light to the upper surface, the thickness is thinner toward the opposite side of the fluorescent lamp 21.

The reflective sheet 23 is positioned under the prism light guide plate 22 to reflect the light leaking to the top to prevent a decrease in luminance.

The optical sheet 24 includes an inverted prism sheet 24a and a diffusion sheet 24b stacked in order, and the inverse prism sheet 24a performs a function of condensing light incident from the prism light guide plate 22. The diffusion sheet 24b uniformly diffuses the light passing through the inverse prism sheet 24a and serves to supply the liquid crystal panel 10.

As such, the light emitted from the fluorescent lamp 22 is converted into a high quality uniform light source through the condensing and diffusing process through the prism light guide plate 22 and the optical sheet 24, thereby improving the brightness and viewing angle of the liquid crystal panel 10. It can be improved.

On the other hand, the liquid crystal panel 10 and the backlight assembly 20 are fixed to the edge and the bottom by the support main 30, the liquid crystal panel 10 or the backlight assembly 20 on the inner surface of the support main 30. A fixed structure for mounting is formed.

In order to couple the backlight assembly 20 to the support main 30, the reflective sheet 23 is first installed on the bottom surface, and the fluorescent lamp 21 is fixed to one side of the inner surface of the support main 30. The prism light guide plate 22 is coupled to the upper portion.

At this time, one end of the prism light guide plate 22 is fixed using a lamp housing or a separate structure of the fluorescent lamp 21, and the other end is hook 32 which protrudes into the inner surface of the support main 30 as shown in FIG. It is fixed by).

Two or more such hooks 32 are usually provided at the support main 30 opposite to the fluorescent lamp 21.

Since the support main 30 is usually made of plastic molding or metal, the hook 32 has a certain degree of elasticity. Therefore, when the prism light guide plate 22 is mounted on the upper part of the hook 32 and a force is applied from the top, the prism light guide plate 22 is inserted downward while the hook 32 is opened by elasticity, and the restored hook 32 is the prism. The edge of the light guide plate 22 is fixed.

After the prism light guide plate 22 is mounted, optical sheets 24 such as an inverted prism sheet 24a and a diffusion sheet 24b are sequentially stacked on the upper portion thereof, and the optical sheet 24 supports the support main 30 The optical sheet 24 is lifted when placed on the hook 32 of) so that a portion of the edge of the optical sheet 24 corresponding to the hook 32 is formed in a 'c' shape to prevent the optical sheet 24 from being lifted. It is cut out to form the cutout 25.

When the backlight assembly 20 is fixed to the support main 30 in this order, one liquid crystal display module is completed by coupling the liquid crystal panel 10 to the upper portion and fastening the top case 40.

By the way, as shown in FIG. 2, since the edge of the lower polarizing plate 12 is mounted on the hook 32, the lower polarizing plate 12 and the optical sheet 24 are spaced apart from each other, and thus a thin optical sheet. There is a problem that 24 is not firmly fixed.

Therefore, a part of the optical sheet 24, particularly near the edges, may be lifted up, and thus the lower prism light guide plate 22 may be exposed and scattered light may pass through the prism light guide plate 22. Light leakage that is incident on the liquid crystal panel without being passed through is displayed on the screen.

As shown in FIG. 4, which shows the stacked structure of the liquid crystal panel 10 and the backlight assembly 20, the optical sheet 24 and the hook 32 are almost in contact with each other. The prism light guide plate 22 of the optical sheet 24 should be completely covered, but the prism light guide plate 22 is exposed between the cutout portion 25 and the hook 32 due to the phenomenon of the vicinity of the cutout portion 25 of the optical sheet 24.

In particular, such light leakage occurs frequently on the left and right sides of the hook 32. For this reason, since the light of 11 characters is observed on the screen, the image quality is greatly deteriorated.

The present invention is to solve the above problems, in the liquid crystal display module for fixing the light guide plate using the hook of the support main, to provide a method that can prevent the light leakage occurs in the vicinity of the hook.

The present invention to achieve this object, the liquid crystal panel; A backlight assembly disposed under the liquid crystal panel, the backlight assembly including a lamp, a light guide plate for emitting light of the lamp to an upper surface, and an optical sheet stacked on the light guide plate and condensing or diffusing light; An optical sheet fixing member disposed between the liquid crystal panel and the optical sheet; It provides a liquid crystal display module comprising a support main for supporting the liquid crystal panel and the backlight assembly.

The support main has a frame shape and a hook for fixing the light guide plate is protruded on an inner surface thereof, and the optical sheet has a cutout corresponding to the protruding hook, and the optical sheet fixing member is disposed between the liquid crystal panel and the optical sheet. Characterized in that the pad fills the gap.

In this case, the pad is preferably attached to the periphery of the cutout, and may be an adhesive tape adhered to an upper surface of the optical sheet.

In addition, the present invention, a liquid crystal panel; A backlight assembly disposed under the liquid crystal panel, the backlight assembly including a lamp, a light guide plate emitting light of the lamp to an upper surface, and an optical sheet stacked on the light guide plate and configured to collect or diffuse light; A support main having a frame shape supporting the liquid crystal panel and the backlight assembly; It provides a liquid crystal display module comprising an optical sheet fixing member protruding toward the inner side of the support main to simultaneously compress and fix the edge of the light guide plate and the optical sheet.

At this time, the step of inserting the edge of the optical sheet may be formed on the bottom of the optical sheet fixing member.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First embodiment

5 is a partial perspective view illustrating a state in which the pad 100 is attached around the hook 32 according to the first embodiment of the present invention, and FIG. 6 is a stacked structure of the liquid crystal panel 10 and the backlight assembly 20. It is a cross-sectional view.

The first embodiment of the present invention is characterized in that the optical sheet 24 is not lifted by attaching a pad 100 having a predetermined thickness to the top edge of the optical sheet 24.

When the prism light guide plate 22 is used, since the optical sheet 24 has a structure in which the reverse prism sheet 24a and the diffusion sheet 24b are sequentially stacked from the bottom, the pad 100 is actually a diffusion sheet ( Attached to the top of the 24b), the pad 100 is preferably provided in the form of adhesive tape so as not to flow in the upper portion of the diffusion sheet (24b).

On the other hand, the pad 100 may be attached along the edge of the optical sheet 24 long, but for easy operation, the optical sheet cutout 25 is particularly around the hook 32 where light leakage occurs frequently. It is preferable to attach only to the left and right of the.

Experimentally, the conventional light leakage phenomenon can be prevented by only attaching the pad 100 having a length of about 20 mm to both sides of the cutout 25.

That is, when the pad of about 20 mm is attached to the optical sheets 24 on the left and right sides of the hooks 32 as shown in FIG. The phenomenon can be prevented.

On the other hand, the pad 100 is interposed between the top surface of the optical sheet 24 and the lower polarizing plate 11, in order to use without changing the existing structure of the support main 30 to a thin thickness of about 0.5mm Although manufacturing is preferable, it is a matter of course that it is not limited to this.

In order to complete the liquid crystal display module according to the first embodiment of the present invention, a lamp 21 and a reflective sheet 23 are mounted on the support main 30, and the prism light guide plate 22 is used by the hook 32. After fixing by fixing, the optical sheet 24 having the cutout portion 25 corresponding to the hook 32 is laminated on the prism light guide plate 22.

Next, after the pad 100 is attached to the top surface of the optical sheet 24 around the hook 32, the lower polarizing plate 12, the liquid crystal panel 10, and the upper polarizing plate 11 are sequentially stacked, and the top case ( When the edge of the upper polarizing plate 11 is crimped and fixed to the support main 30, the liquid crystal display module is completed.

Second embodiment

7 and 8 are a partial perspective view showing a state in which the optical sheet is fixed in accordance with a second embodiment of the present invention and a cross-sectional view of the combination of the liquid crystal display device module, respectively.

As can be seen in the figure, the second embodiment of the present invention is unlike the conventional method in which the hook 32 of the supporter main 30 fixed only the prism light guide plate 22, the edge of the optical sheet 24 is also fixed together. There is a characteristic to one point.

That is, a part of the edge of the optical sheet 24 was inserted in the lower part of the hook 32 as it is, without forming the cutout part as usual in the optical sheet 24.

In this case, the edges of the prism light guide plate 22 and the optical sheet 24 may be inserted under the hook 32 without changing the structure of the hook 32, but the hook 32 of the support main 30 is the prism light guide plate 22. It is also expected that there is no free space in which the optical sheet 24 can be inserted at the bottom because it is designed to be fixed only.

In this case, as shown in FIG. 9, a step 32a having a height corresponding to the thickness of the optical sheet 24 is formed on the bottom of the hook 32 to secure a space corresponding to the thickness of the optical sheet 24. After that, the edge of the optical sheet 24 can be inserted into this space.

In particular, the second embodiment of the present invention, in addition to the effect of preventing the lifting of the optical sheet 24, there is also an advantage that can solve problems such as noise or friction caused by the direct contact between the prism light guide plate 22 and the hook 32 have.

In order to complete the liquid crystal display module according to the second embodiment of the present invention, a lamp 21 and a reflective sheet 23 are mounted on the support main 30, and the prism light guide plate 22 is attached to the hook 32. After fixing by using, the edge of the optical sheet 24 is inserted into the lower portion of the hook 32 while fixing the optical sheet 24 on the prism light guide plate 22.

Next, the lower polarizing plate 12, the liquid crystal panel 10, and the upper polarizing plate 11 are sequentially stacked on the optical sheet 24, and the upper case 40 is fastened to the support main 30 while the upper polarizing plate ( When the edge of 11) is pressed and fixed, the liquid crystal display module is completed.

On the other hand, the above description was limited to the liquid crystal display module using the prism light guide plate 22, but the present invention is not limited to the case of using the prism light guide plate, it can be applied to the case of using other types of light guide plate, of course. to be.

In addition, the optical sheet 24 of the present specification includes all kinds of sheets for diffusing or condensing light passing through the light guide plate, and may be expanded to include a protective sheet for protecting the optical sheet.

According to the present invention, since the 11-character light leakage phenomenon occurring near the hook of the support main is prevented, the image quality can be greatly improved. In addition, friction may be prevented by preventing the light guide plate and the support main from directly contacting each other.

Claims (6)

A liquid crystal panel; A backlight assembly disposed under the liquid crystal panel, the backlight assembly including a lamp, a light guide plate for emitting light of the lamp to an upper surface, and an optical sheet stacked on the light guide plate and condensing or diffusing light; An optical sheet fixing member disposed between the liquid crystal panel and the optical sheet; A support main supporting the liquid crystal panel and the backlight assembly Liquid crystal display module comprising a The method of claim 1, The support main has a frame shape and a hook for fixing the light guide plate is protruded on an inner surface thereof, and the optical sheet has a cutout corresponding to the protruding hook, and the optical sheet fixing member is disposed between the liquid crystal panel and the optical sheet. Liquid crystal display module, characterized in that the pad to fill the gap between The method of claim 2, The pad is a liquid crystal display module attached to the periphery of the cutout The method of claim 2, The pad is a liquid crystal display module provided with an adhesive tape adhered to an upper surface of the optical sheet. A liquid crystal panel; A backlight assembly disposed under the liquid crystal panel, the backlight assembly including a lamp, a light guide plate for emitting light of the lamp to an upper surface, and an optical sheet stacked on the light guide plate and condensing or diffusing light; A support main having a frame shape supporting the liquid crystal panel and the backlight assembly; The optical sheet fixing member protrudes to the inner side of the support main to simultaneously compress and fix the edges of the light guide plate and the optical sheet. Liquid crystal display module comprising a The method of claim 5, Liquid crystal display module having a step of inserting the edge of the optical sheet is formed on the bottom surface of the optical sheet fixing member

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