KR100692686B1 - structure for preventing the shine through of liquid crystal display - Google Patents

Abstract

The present invention is a light leakage prevention structure of the liquid crystal display device that can improve the light leakage phenomenon generated by the light gap is transmitted to the gap (gap) between the mold frame and the lower polarizing plate of the backlight unit by changing the polarizing plate structure As described above, the upper and lower polarizers disposed to face each other, and the upper and lower polarizers formed on the outer surfaces of the upper and lower substrates, respectively, and have different thicknesses between areas where the screen is displayed and areas that are not displayed. And a bezel surrounding a portion of the upper substrate including the upper polarizing plate and overlapping an area where the screen of the upper polarizing plate is not displayed to block a gap with the upper polarizing plate.

Description

Structure for preventing the shine through of liquid crystal display}

1 is a view for explaining a conventional backlight unit.

Fig. 2 is a cross-sectional view for explaining a thin film transistor-liquid crystal display device according to a first embodiment of the prior art.

Fig. 2 is a cross-sectional view for explaining a thin film transistor-liquid crystal display device according to a second conventional embodiment.

3 is a cross-sectional view illustrating a light leakage preventing structure of a liquid crystal display device according to the present invention;

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor-liquid crystal display device. More specifically, light is transmitted to a gap between a mold frame and a lower polarizing plate of a backlight unit by changing a polarizing plate structure so that light leakage occurs in the bezel gap. The present invention relates to a light leakage preventing structure of a liquid crystal display device capable of improving defects.

1 is a view for explaining a conventional backlight unit.

As shown in FIG. 1, a conventional backlight unit includes a light guide plate 2 through which a light source 1 and a light source are transmitted, a reflection plate 4 reflecting light from a light scattering layer 3 under the light guide plate 2, One end of the light source (1) and the other end of the light guide plate (2) and the reflecting plate (4), the lamp reflector (8) for light incident from the light source 1 to the light guide plate (2), and the light guide plate A diffuser plate 5 is formed on the upper surface of the diffuser plate to uniformize the luminance of the illumination surface across the entire surface, and two light collector plates 6 and 7 for concentrating the diffused light to improve the luminance.

In the lower part of the lighting device having the above configuration, a cover 9 serving to support the load of the parts is arranged.

In the panel 16, an upper substrate 10, which is a color filter substrate, and a lower substrate 20, which is a thin film transistor array substrate, are disposed on an upper side of the panel 16, respectively, and an outer surface of the upper substrate 10 and the lower substrate 20. The upper polarizing plate 12 and the lower polarizing plate 22 are disposed in each, and the liquid crystal layer 40 is interposed between the upper substrate 10 and the lower substrate 20. There is also a bezel 13 supporting all of the above components.

2 is a view for explaining a thin film transistor-liquid crystal display device according to a first embodiment of the present invention.

Referring to the above-described backlight unit structure, a thin film transistor liquid crystal display according to a first embodiment of the present invention will be described.

As shown in FIG. 2, the thin film transistor liquid crystal display according to the first exemplary embodiment includes an upper substrate 10 and a lower substrate 20 disposed opposite to each other, an upper substrate 10, and a lower substrate ( The liquid crystal layer 40, the upper polarizing plate 12, the lower polarizing plate 22, and the upper polarizing plate 12 formed on the outer surfaces of the upper substrate 10 and the lower substrate 20, respectively, are interposed between 20. It is configured to include a bezel 50 that covers the outer portion of the upper substrate 10 that is not.

However, in the first exemplary embodiment of the present invention, light is transferred to the gap between the mold frame 15 and the lower polarizer 22 of the backlight unit (part B), and thus light leakage occurs in the gap between the bezel 13. There is a problem that occurs. On the other hand, A not described in Figure 2 shows the light that normally comes through the panel 30.

3 is a view for explaining a thin film transistor-liquid crystal display device according to a second embodiment of the present invention.

In order to prevent such light leakage, in the second embodiment of the present invention, as shown in FIG. 2, light emitted from the gap between the lower polarizing plate 12 and the bezel 13 is blocked using the light shielding tape 60. The structure is adopted.

However, in the second embodiment of the present invention, there is a disadvantage in that the thickness and weight of the thin film transistor liquid crystal display device increase, which makes it difficult to apply a lightweight thin product.

Accordingly, the present invention has been made to solve the above-mentioned problems, the thickness of the lower polarizing plate and the upper polarizing plate is different from the area where the screen is displayed and the other area, but the screen is not displayed because the screen is not displayed By making the thickness thinner than the area to be made, the purpose of the present invention is to provide a light leakage preventing structure of the liquid crystal display device, which has a structure in which the upper polarizer is completely overlapped under the bezel to improve light leakage.

The thin film transistor-liquid crystal display device according to the present invention for achieving the above object is formed on the upper substrate and the lower substrate facing each other, and the outer surface of the upper substrate and the lower substrate, respectively, the display area and the non-display An upper polarizer and a lower polarizer having different thicknesses between the regions, and a bezel surrounding a portion of the upper substrate including the upper polarizer and overlapping an area where the screen of the upper polarizer is not displayed to block a gap with the upper polarizer. It is characterized by.

Preferably, the upper and lower polarizers have a thicker area than the non-displayed area where the screen is displayed.

In the upper and lower polarizers, the area on which the screen is displayed preferably has a structure in which a release film, PSA, TAC, PVA, TAC, and a protective film are sequentially stacked.

In the upper and lower polarizers, the area where the screen is not displayed preferably has a structure in which PSAs and PVAs are sequentially stacked.

(Example)

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

4 is a view for explaining a thin film transistor-liquid crystal display device according to the present invention.

As shown in FIG. 4, the thin film transistor-liquid crystal display device according to the present invention includes an upper substrate 100 that is a color filter substrate and a lower substrate 110 that is a thin film transistor array substrate, which are disposed to face each other. The thickness between the liquid crystal layer 120 interposed between the substrate 100 and the lower substrate 110, and the outer surface of the upper substrate 100 and the lower substrate 110, respectively, between the area where the screen is displayed and the area that is not displayed is The upper polarizing plate 102 and the lower polarizing plate 112 formed differently and a part of the upper substrate 100 including the upper polarizing plate 102 are wrapped and overlap the area where the screen of the upper polarizing plate 102 is not displayed. It is configured to include a bezel 130 to block the gap with 102.

The upper polarizer 102 and the lower polarizer 112 are a release film, a pressure sensitive adhesive (PSA) film, a first tri-acetyl-cellulose (TAC) film, a polyvinyl alcohol (PVA), and a second TAC film in a region where a screen is displayed. And a protective film is laminated in order. On the other hand, the upper polarizing plate 102 and the lower polarizing plate 112 has a structure in which the PSA film and the PVA film is sequentially stacked in the region where the screen is not displayed. Therefore, the upper polarizer 102 and the lower polarizer 112 are manufactured to be much thinner than the area where the screen is displayed.

As a result, the area where the screen is displayed on the upper polarizing plate 102 and the lower polarizing plate 112 is manufactured with the same thickness as before, and the area where the screen is not displayed is made thinner than the conventional one, The bezel overlaps an area where the screens of the upper polarizer 102 and the lower polarizer 112 are not displayed.

Here, in particular, as the bezel overlaps on an area where the screen of the upper polarizing plate 102 is not displayed, a gap between the upper polarizing plate and the bezel does not occur. As a result, light is transmitted to the gap between the mold frame of the backlight unit and the lower polarizer 112 to improve light leakage caused by light leakage in the gap between the bezel 130.

As described above, in the present invention, the thickness of the lower polarizing plate and the upper polarizing plate is different from the area where the screen is displayed and the area where the screen is not, but the area where the screen is displayed is the same as the existing thickness, and the screen is not displayed because the screen is not displayed. By making the thickness thinner than the area where the screen is displayed, the upper polarizing plate is completely overlapped with a bezel. Therefore, the present invention has an advantage that the light leakage caused by the light is transmitted to the gap between the mold frame and the lower polarizing plate of the backlight unit to the gap between the lower polarizing plate and the bezel is improved.

On the other hand, the present invention has the advantage that it is possible to develop a light weight thin film transistor liquid crystal display device product without increasing the thickness and weight.

In addition, this invention can be implemented in various changes within the range which does not deviate from the summary.

Claims (4)

An upper substrate and a lower substrate disposed to face each other; Upper and lower polarizers formed on outer surfaces of the upper and lower substrates, respectively, and having different thicknesses between areas where the screen is displayed and areas that are not displayed; The light leakage of the liquid crystal display device includes a bezel surrounding a portion of the upper substrate including the upper polarizing plate and overlapping an area where the screen of the upper polarizing plate is not displayed to block a gap with the upper polarizing plate. Resistant structure. The light leakage preventing structure of claim 1, wherein the upper and lower polarizers have a thicker area than the non-displayed area where the screen is displayed. The liquid crystal display device of claim 1, wherein in the upper and lower polarizers, an area on which the screen is displayed has a structure in which a release film, PSA, TAC, PVA, TAC, and a protective film are sequentially stacked. rescue. The light leakage preventing structure of the liquid crystal display device according to claim 1, wherein in the upper and lower polarizers, regions where the screen is not displayed have a structure in which PSAs and PVAs are sequentially stacked.

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