KR100426682B1 - Method for fabricating large-sized lcd and structure for large-sized lcd by the same - Google Patents

Abstract

PURPOSE: A method for fabricating a large-sized LCD(Liquid Crystal Display) and a structure for the large-sized LCD by the same are provided to tile a plurality of liquid crystal panels and fabricate one large-sized LCD. CONSTITUTION: Upper plates(113a) and lower plates(113b) of liquid crystal panels are fabricated. Seal is printed in an internal side boundary of black matrixes(123) of corners and edges of the liquid crystal panels. The upper plates(113a) and the lower plates(113b) of the liquid crystal panels are attached to be opposite. Liquid crystal is injected between the upper plates(113a) and the lower plates(113b), and an injection hole is sealed to fabricate a plurality of the liquid crystal panels. Adhesive sides in which the liquid crystal panels are mutually connected are cut and processed. An adhesive spacer is diffused in the adhesive sides of the liquid crystal panels. The liquid crystal panels are tiled on a lower back panel(111b) corresponding to a size of a large-sized liquid crystal panel. An upper back panel(111a) is attached on the tiled liquid crystal panels.

Description

Large liquid crystal display device manufacturing method and structure of large liquid crystal display device by its manufacturing method

The present invention relates to a method of manufacturing a large-sized liquid crystal display device and a structure of a large-sized liquid crystal display device by the method of manufacturing the same. In particular, the present invention relates to a method of manufacturing a large liquid crystal panel by connecting (or " tiling ") several liquid crystal panels and a structure of a large liquid crystal panel by the method.

In general, a liquid crystal panel used in a liquid crystal display device is made of a structure in which two transparent substrates (first substrate and second substrate) provided with various devices are mounted so as to face each other at regular intervals and liquid crystal material is filled therebetween. The first substrate (or the upper plate) of the liquid crystal panel includes a color filter, a black matrix, a common electrode, and the like. The color filter is constituted in the case of a color liquid crystal display device and is used as means for implementing color. The black matrix is provided between each pixel of the screen so that optical interference due to leakage light does not occur between adjacent pixels. The common electrode is an electrode for forming an electric field for driving the liquid crystal. The second substrate (or the lower substrate) opposite to the first substrate includes a pixel electrode, a thin film transistor, a signal line, and an address line. The pixel electrode corresponds to the common electrode and is the other electrode for forming the electric field for driving the liquid crystal. The thin film transistor is a switch element for operating the pixel electrode. The preference line and the address line are bus lines for transmitting image information signals and position information of image information, respectively.

The size of the liquid crystal panel is limited due to its manufacturing characteristics. The size of the currently produced liquid crystal panel is about 10 to 14 inches. Of course, there is no attempt to fabricate a larger screen (20 inches, 25 inches, 28 inches, etc.) on a single substrate, but in general, when making a large screen, several small panels are defined as a back panel And is manufactured by tiling between corresponding two large glass substrates. In the process of connecting multiple liquid crystal panels, unevenness of the connection surface, breakage due to collision or friction may cause scratches on the connection and adhering parts. In this case, the production yield is lowered, and the joint portion can be recognized by the spectator and the image quality is deteriorated.

Tiling of Several Liquid Crystal Panels Hereinafter, a manufacturing method generally used in manufacturing a large-sized liquid crystal panel will be described. As a first method, there is a method of "liquid crystal injection after tiling". The upper plate 13a of the liquid crystal panels is tiled by the upper back panel 11a of the large liquid crystal panel to be manufactured and the upper plate of the large liquid crystal panel is manufactured. Are tied to the lower back panel 11b to fabricate the lower panel of the large liquid crystal panel. Then, the upper plate and the lower plate of the large liquid crystal panel are opposed to each other, and the liquid crystal 17 is injected therebetween and sealed. In the case of adopting this process, there may arise a problem that the quality of the liquid crystal is deteriorated when the adhesion error is large in the connected portion. As a second method, there is a method of "tiling" after liquid crystal injection. This is because a plurality of liquid crystal panels 13 completed until the liquid crystal injection process is tiled on the lower plate 11b (or the upper plate 11a) of the large liquid crystal panel and the upper plate 11a Or the lower plate 11b). FIG. 1 schematically shows a large-sized liquid crystal panel manufactured by such a method.

FIG. 1 is a view showing the structure of a large liquid crystal panel manufactured by tiling a plurality of liquid crystal panels according to the related art

FIG. 2 is an enlarged view showing a state of adhesion when a plurality of liquid crystal panels are tiled by a conventional technique.

FIG. 3 is a view showing a process of tiling a plurality of liquid crystal panels according to the present invention.

FIG. 4 is an enlarged view showing the structure of a large liquid crystal panel manufactured by tiling a plurality of liquid crystal panels according to the present invention.

FIG. 5 is an enlarged cross-sectional view illustrating a structure of a large liquid crystal panel manufactured according to the present invention, in which a tied connection portion is not observed.

FIG. 6 is a view showing a structure in which a black matrix is provided at a connection portion where liquid crystal panels are connected to each other in a back panel according to the present invention.

Description of the Related Art [0002]

11, 111: back panel 11a, 111a: upper back panel

11b, 111b: lower back panel 13, 113: liquid crystal panel

13a, 113a: upper plate 13b of the liquid crystal panel, 113b: lower plate of the liquid crystal panel

117: liquid crystal 19, 119: adhesive spacer

121: pixel 123: black matrix (BM)

25, 125: seal 127: cut virtual line

131: Black Matrix installed on the back panel

T1: width of the liquid crystal panel normal portion BM according to the prior art

T2: width of the liquid crystal panel boundary portion BM according to the prior art

T3: width of the liquid crystal panel boundary portion BM according to the present invention

D: Adhesion interval of tiling

D1, D2: Adhesion interval by twisting tiling

dDv: vertical bonding error dDh: horizontal bonding error

? ₁ : a connection-recognizable angle at which the liquid crystal panels are connected by the conventional technique

[theta] ₂ : According to the present invention,

SUMMARY OF THE INVENTION It is an object of the present invention to provide a liquid crystal panel completed by a liquid crystal injection process in a manufacturing process of a large liquid crystal panel by tiling between two large glass substrates. In particular, the present invention provides a manufacturing method that overcomes the problem that the production yield is lowered due to breakage due to collision during the bonding operation and leakage of the liquid crystal due to the actual printing blot of the bonding portion. The present invention also provides a manufacturing method for preventing image quality from being recognized by an observer. A manufacturing method for achieving the above object will be described in detail in the following examples.

Example 1.

After the upper plate 113a and the lower plate 113b of the liquid crystal panel are manufactured, a seal 125 is printed on the edge of the panel to attach the upper and lower plates (FIG. When a plurality of liquid crystal panels fabricated in this manner are tiled, margins of the two liquid crystal panels can be observed to be conspicuous after tiling. In order to prevent this, after the seal 125 is printed, the liquid crystal 117 is poured, sealed, and cut off leaving only a fine portion. Or the black matrix BM is provided on the edge of the liquid crystal panel, the seal printing is performed across the inner boundary line of the edge BM at the edge of the panel. After the upper and lower plates are attached to each other with the seal printing pattern, liquid crystal is injected, the liquid crystal injection hole is sealed, and then the margin portion outside the BM is cut (127) (FIG.

Next, the liquid crystal panels 113 manufactured in the same manner as above should be tiled on the large back panel 111. The error of roughly tiling is 5 占 퐉 in the horizontal direction dDh, dDv) and the error should be about 0.3 탆 (Fig. 2 (a)). However, if the adhesive portion of the liquid crystal panel is not worked properly, the adhesive spacing of the adhesive may become uneven, resulting in twisting during tiling (FIG. 2 b). In this case, the adhesive gap error may deviate from the tolerance value (D1-D2> 5 μm). To compensate for these disadvantages, the spacers are scattered on the bonding surface to maintain a uniform bond spacing. At this time, since the adhesive gap tolerance is 5 占 퐉, it is preferable to use the adhesive spacer 119 having a diameter of about 5 占 퐉 (FIG. Then, these liquid crystal panels are tiled between the substrates 111 of the large liquid crystal panel (FIG. 3 d, e).

Example 2

In the connecting adhesive portion of a large liquid crystal panel manufactured by tiling a plurality of liquid crystal panels by the conventional method or in the tiling method as in Embodiment 1, the connecting adhesive portion is as shown in FIG. 4 . Here, since the backlight 151 leaks from the connection and adhering portion of the liquid crystal panels and passes through the thickness of the liquid crystal panel to a thickness of about 100 占 퐉 to several 占 퐉 and the black matrix width T2 formed on the liquid crystal panel is also about several tens 占 퐉, The scattering angle [theta] ₁ of the back light 151 is about 60 [deg.] (Fig. 4 (b)). This angle is also equal to the angle at which the connecting and bonding portion can be recognized. This is within the viewing angle range of a general liquid crystal display device, and thus can be sufficiently recognized by an observer. The BM of connecting the bonding portion wider than a width (T ₁₎ of the other part BM To prevent this, (T ₃₎ formed (FIG. 5 a), the light scattering angle, and the bonding portion recognized angle (θ ₂₎ conventional optical scattering angle And the adhesive portion recognition angle? ₁ (FIG. 5). Then, in the view angle, the observer can not recognize the back light leaking into the gap between the connection adhesive portion and the connection adhesive portion.

Example 3

The black matrix 131 is provided on the back panel along the portion to which the liquid crystal panels are bonded when the liquid crystal panels are bonded onto the back panel of the large liquid crystal panel so that the backlight leaked due to adhesion errors or defects of the bonding portions is intrinsically blocked (FIG. 5 b, c, FIG. 6). At this time, the BM 131 may be installed on the upper back panel 111a of the back panel 111 where the plurality of liquid crystal panels 113 are tiled (FIG. 5b), and the lower back panel 111b The BM 131 may be installed.

The present invention provides a method of preventing breakage occurring in a tiling process and preventing a connection and adhering portion from being recognized by an observer when a large liquid crystal panel is manufactured by tiling a plurality of liquid crystal panels do. By doing so, the production yield of the product is increased and the image quality is improved.

Claims (8)

In manufacturing a large liquid crystal panel having a size twice as large as that of the liquid crystal panel by tiling a plurality of liquid crystal panels, Fabricating the upper and lower plates of the liquid crystal panels; Printing inside the inner boundary of the black matrix of the edges and edges of the liquid crystal panels; Attaching the upper and lower plates of the liquid crystal panels so as to face each other; Injecting liquid crystal between the upper plate and the lower plate, and sealing the injection port to manufacture a plurality of liquid crystal panels; Cutting and processing the adhesive side of the liquid crystal panels connected to each other; Disposing an adhesive spacer on the adhesive side of the liquid crystal panels; Tiling the liquid crystal panels on the lower back panel corresponding to the size of the large liquid crystal panel; And attaching the upper back panel on the tiled liquid crystal panels. The method according to claim 1, Wherein the width of the black matrix at the edges of the liquid crystal panels is wider than the width of the black matrix at other portions. 3. The method according to claim 1 or 2, And installing a black matrix on a portion of the upper back panel where the liquid crystal panels are adhered. 3. The method according to claim 1 or 2, And providing a black matrix on a portion of the lower back panel to which the liquid crystal panels are bonded. A structure of a large liquid crystal panel having a size two times larger than that of the liquid crystal panel manufactured by tiling a plurality of liquid crystal panels, An upper and a lower transparent substrate having a size corresponding to the size of the large liquid crystal panel; The liquid crystal panels tied between the upper and lower substrates, the edge portions of which are cut off, except for the black matrix portion, and are tied between the upper and lower substrates; And an adhesive spacer for adhering the liquid crystal panels to each other while maintaining a constant adhesive distance from the connection adhesive surface of the tiled liquid crystal panels. 6. The method of claim 5, And the black matrix width of the edge is made wider than the black matrix width of the other portion. The method according to claim 5 or 6, And a black matrix provided on a portion of the upper back panel to which the liquid crystal panels are adhered. The method according to claim 5 or 6, And a black matrix provided on a portion of the lower back panel to which the liquid crystal panels are adhered.