KR101033462B1 - tiled large size liquid crystal display device - Google Patents

Abstract

The present invention includes a liquid crystal layer and upper and lower substrates facing each other with the liquid crystal layer interposed therebetween with at least one edge interposed therebetween, and one side edge of the side black matrix interposed on the same plane is a tiling agent. At least two liquid crystal panels bonded to each other through a medium; A backlight assembly emitting light forward from the rear of the two or more liquid crystal panels bonded to each other; The tiling agent is interposed between the backlight assembly and the at least two liquid crystal panels bonded to each other, and the light is irradiated from the backlight assembly to the bonding portion covered by the tiling agent and each side black matrix positioned at both sides thereof. A light scattering film which bisects as a reference and refracts the respective side black matrices outward; A lens provided on each of the liquid crystal panels and refracting the light refracted by the light scattering film to the upper portion of the bonding portion; It provides a tiled large-area liquid crystal display device comprising a diffuser plate provided in front of the lens to scatter light forward.

Tiling, Tiling Agent, Side Black Matrix, Lens, Light Scattering Film, Diffusion Plate

Description

Tiled large size liquid crystal display device             

1 is a plan view of a typical tiled large area liquid crystal display.

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 for explaining a seamless pattern removing structure of a general tiled large area liquid crystal display. FIG.

3 is a plan view of a tiled large area liquid crystal display according to the present invention;

4 is a cross-sectional view taken along line IV-IV of FIG. 3 to illustrate a seamless pattern removing structure of a tiled large area liquid crystal display according to the present invention.

5 is an enlarged cross-sectional view of the light scattering film corresponding to the portion K of FIG.

6 is a circuit diagram of one pixel formed in any liquid crystal panel of a tiled large area liquid crystal display according to the present invention.

<Description of the symbols for the main parts of the drawings>

A ', B', C ', D': First to fourth liquid crystal panels 102a, 102b, 102c, 102d: Lower substrate

104a, 104b, 104c, 104d: Upper substrate 103a, 103b: Liquid crystal layer

106a, 106b, 106c, 106d: gate pad                 

108a, 108b, 108c, 108d: Data pad 110a, 110b: Seal pattern

112a, 112b: side black matrix 120: tiling agent

136a, 136b: lens 130: backlight assembly

132: light source 140: diffuser plate

200: light scattering film 202: acid

204: goal S ': junction

The present invention relates to a tiled large-area liquid crystal display device, and more particularly, to forming a large-area liquid crystal display device by tiling at least two liquid crystal panels with each other. A tiled large area liquid crystal display device can be reduced.

In the era of full-fledged informatization, the display field that processes and displays a large amount of information has rapidly developed. In particular, various flat panel displays having excellent characteristics such as thinning, light weight, and low power consumption have recently been developed. As panel display device (FPD) is introduced, it replaces existing Cathode Ray Tube (CRT).

Specific examples of such a flat panel display include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electroluminescent display device ( electroluminescence display device (ELD), etc. may be mentioned.

Among the most widely used representative flat panel display devices, the liquid crystal display device uses the optical anisotropy and polarization properties of liquid crystals. It has a polarization property that changes the direction of molecular arrangement.

Accordingly, the liquid crystal display device includes a pair of upper and lower substrates having various components each including an electric field generating electrode facing each other, and then a liquid crystal panel in which liquid crystal is filled therebetween. By applying an appropriate voltage to each field generating electrode, an electric field is changed to artificially adjust the arrangement direction of liquid crystal molecules.

In this case, various images are displayed using the change in the transmittance of light.

In particular, an active matrix method that independently controls each pixel, which is a basic unit of image display of a liquid crystal panel, using a switching device is widely used. In this case, a thin film transistor is used as a switching device. Film Transistor (TFT-LCD) is a well-known thin film transistor liquid crystal display (TFT-LCD).

In this case, the above-described active matrix liquid crystal panel is a light-receiving element that does not have its own light emitting element, and thus requires a separate light source, and for this purpose, a backlight assembly including at least one light source on the back of the liquid crystal panel. ) Is irradiated to the liquid crystal panel to realize an image of identifiable luminance.

On the other hand, in order to meet the trend of slimming and large area of various display devices in recent years, attempts have been made to increase the size of liquid crystal display devices, but due to the limitation of process equipment and the increase in the length of wiring, It is known that severe picture distortion occurs when the signal delay is more than 21 inches.

An attempt was made to tiling a number of liquid crystal panels, and a paper presented in the 'SID 97 Digest' paper, '40 "seamless thin film transistor liquid crystal display using seamless connection technology. Dialog Direct-View TFT-LCD by Seamless Connection Technique is a good example.

1 is a plan view schematically illustrating a general tiled large-area liquid crystal display, and as illustrated, separate first to fourth liquid crystal panels A, B, C, and D are connected to each other so that one It has a large area liquid crystal display device.

In this case, each of the liquid crystal panels A, B, C, and D has a configuration substantially similar to that of the general case. The lower substrates 2a, 2b, 2c, and 2d and the upper substrate 4a opposed to each other with the liquid crystal layer interposed therebetween. , 4b, 4c, and 4d).

Although not clearly shown, each of the lower substrates 2a, 2b, 2c, and 2d includes a pixel in which a plurality of gate lines and data lines cross each other in length and width, and a thin film transistor and a pixel electrode provided in each of the lower substrates 2a, 2b, 2c, and 2d. And gate gates 6a, 6b, 6c, and 6d for applying gate signals, which are driving signals of the thin film transistors, to the respective gate lines along one outer edge thereof, and the pixel electrodes along the other outer edge thereof. Data pads 8a, 8b, 8c and 8d are provided for applying the transmitted data signals to the respective data lines.

In addition, each upper substrate 4a, 4b, 4c, and 4d is provided with a common electrode for determining the molecular arrangement direction of the liquid crystal corresponding to the pixel electrode, and the light leakage phenomenon and the thin film transistor generated at the boundary between each pixel are provided. A black matrix which prevents light ingress and suppresses leakage current, and red, green, and blue color filters corresponding to each pixel are provided.

The first to fourth liquid crystal panels A, B, C, and D are disposed on the same plane so that the gate pads 6a, 6b, 6c, and 6d and the data pads 8a, 8b, 8c, and 8d are facing outwards. The side surfaces of the liquid crystal display are bonded to each other to form a large area liquid crystal display device. The configuration of the bonding portion S between the liquid crystal panels is the same as that of FIG. 2 taken along the line II-II of FIG. 1.

2 illustrates the selection of the first and second liquid crystal panels A and B to explain the junction S between any two liquid crystal panels. The same applies to other liquid crystal panels.

As shown, the first and second liquid crystal panels A and B include lower substrates 2a and 2b and upper substrates 4a and 4b which face each other with the liquid crystal layers 3a and 3b interposed therebetween. The seal patterns 10a and 10b of the sealant, which is a thermosetting resin, are formed along edges of the upper and lower substrates 2a, 2b, 4a, and 4b to seal the injection space of the liquid crystal layers 3a and 3b. Doing.

The side surfaces of the first and second liquid crystal panels A and B facing each other are joined to form the same plane by the tiling agent 20, and the tiling agent 20 is formed on each of the liquid crystal panels A and B. The sealant for bonding the upper and lower substrates 2a, 2b, 4a, and 4b may be similar to each other, but black pigment is generally contained.

In addition, since the bonding surface between the first and second liquid crystal panels A and B is a non-display area irrelevant to image display, the side black matrix is formed at the inner edges of the failed turns 10a and 10b of the liquid crystal panels A and B, respectively. 12a and 12b are formed to prevent light leakage, which may be formed on the respective upper substrates 4a and 4b. Therefore, the sealing patterns 10a and 10b and the side black matrices 12a and 12b of the tiling agent 20 and the first and second liquid crystal panels A and B bonded to each other form the bonding portion S. .

The first and second liquid crystal panels A and B are provided with a backlight assembly 30 including a plurality of light sources 32 and an optical member such as a light guide plate to evenly diffuse the light emitted therefrom. Light is supplied toward the first and second liquid crystal panels A and B.

On the other hand, in the general tiled large-area liquid crystal display device, the most important thing is to control the luminance deterioration at the junction between the liquid crystal panels. In other words, as shown in FIG. 2, the first and second liquid crystal panels A and B The bonding portions S connected to each other are the seal patterns 10a and 10b and the side black matrices 12a and 12b provided in the tiling agent 20 and the first and second liquid crystal panels A and B on both sides thereof. Light is blocked by the backlight assembly 30, so that the luminance is significantly lower than that of other regions, so that a seam appears.

As a result, the image displayed to the user is also divided by the number of liquid crystal panels. Thus, a method for removing such a seamless stain, a so-called seamless technology, has been contemplated, and as a result, the first bonded images are shown. And predetermined lenses 36a and 36b for refracting the light passing through portions other than the bonding portion S along the side edges of the second liquid crystal panels A and B to the bonding portion S, respectively. The diffusion plate 40 was arranged forward.

Accordingly, even though the brightness of the junction S decreases, the light in the vicinity is refracted by the lenses 36a and 36b to slightly improve the brightness of the blocking area S, and then diffusely diffused into the diffuser plate 40 to smooth the seam. This can be said to be the minimum.

However, this case also shows a limit in which the seamless stain is not completely removed. Even though the brightness of the part is increased by refracting the light to the junction S using the respective lenses 36a and 36b, the refracted light eventually becomes The light is in the vicinity of the junction S of the first and second liquid crystal panels A and B, and thus the luminance of the junction S and the vicinity thereof is reduced as a whole.

As a result, the seamless stain removal technique of the tiled large-area liquid crystal display device has been able to reduce the brightness deterioration of the junction S slightly, but has the disadvantage of lowering the luminance of the wider area as a whole. As the luminance of the vicinity of the liquid crystal panel, including the junction S, decreases, the divided image is viewed.

Accordingly, the present invention has been made to solve the above problems, in the large-area liquid crystal display device in which at least two liquid crystal panels are tiled to remove the seamless stains due to the luminance decrease at the junction of these liquid crystal panels, This aims to provide a more improved image.

The present invention includes a liquid crystal layer and upper and lower substrates facing each other with the liquid crystal layer interposed therebetween with at least one edge interposed therebetween in order to achieve the above object, wherein the side black matrix is disposed on the same plane. At least two liquid crystal panels having one edge side interposed therebetween bonded to each other through a tiling agent; A backlight assembly emitting light forward from the rear of the two or more liquid crystal panels bonded to each other; The tiling agent is interposed between the backlight assembly and the at least two liquid crystal panels bonded to each other, and the light is irradiated from the backlight assembly to the bonding portion covered by the tiling agent and each side black matrix positioned at both sides thereof. A light scattering film which bisects as a reference and refracts the respective side black matrices outward; A lens provided on the liquid crystal panel to refract the light refracted by the light scattering film to the upper portion of the bonding portion; It provides a tiled large-area liquid crystal display device comprising a diffuser plate provided in front of the lens to scatter light forward.                     

In this case, the light scattering film is characterized in that the prism sheet formed with a plurality of predetermined triangular patterns, in particular, the triangular pattern in the region overlapping the bonding portion with respect to the tiling agent relative to each other in both directions to the refractive index gradually The present invention will be described in more detail with reference to the accompanying drawings.

3 is a plan view of the tiled large-area liquid crystal display according to the present invention, in which the first to fourth liquid crystal panels A ', B', C ', and D' are bonded to each other on the same plane.

The first to fourth liquid crystal panels A ', B', C ', and D' are provided with gate pads 106a, 106b, 106c, and 106d provided at one edge thereof, and data provided at other edges adjacent thereto. The pads 108a, 108b, 108c, and 108d are outward from each other, although the four liquid crystal panels A ', B', C ', and D' constitute one large area liquid crystal display in the drawing. Therefore, it is natural that only two liquid crystal panels may be bonded on the same plane. In this case, each of the gate pads and the data pads are turned outwardly.

In this case, each of the liquid crystal panels A ', B', C ', and D' has the same structure as that of the general one, and the lower substrates 102a, 102b, 102c, and 102d facing each other with the liquid crystal layer interposed therebetween. Upper substrates 104a, 104b, 104c, and 104d, respectively.

Although not shown in the accompanying drawings, each of the lower substrates 102a, 102b, 102c, and 102d includes a plurality of parallel gate lines connected to the corresponding gate pads 106a, 106b, 106c, and 106d and corresponding data pads 108a. A plurality of side-by-side data lines connected to (108b, 108c, 108d) intersect longitudinally and horizontally to define a pixel of the matrix form, each pixel is a thin film transistor connected to the gate line and the data line, and connected to the thin film transistor The pixel electrode is mounted.

At this time, the thin film transistor is on / off controlled by the gate signal transmitted to the gate line and serves as a switching element for connecting the data signal, which is an image signal transmitted from the data line, to the pixel electrode.

The upper substrates 104a and 104b of the first to fourth liquid crystal panels A ', B', C ', and D' facing the lower substrates 102a, 102b, 102c and 102d with the liquid crystal layer interposed therebetween. 104c and 104d are provided with a common electrode having a fixed potential corresponding to the pixel electrode, and a black matrix which blocks light to suppress light leakage and prevent leakage current of the thin film transistor by covering a non-display area between each pixel. In addition, each pixel includes red, green, and blue color filters.

In addition, a backlight assembly, which will be described later, is provided at the rear of each of the liquid crystal panels A ', B', C ', and D' having such a configuration to supply light to the front. If the molecular arrangement of the liquid crystal is changed due to the potential difference and the transmittance is changed, the light of the backlight assembly passes through these pixels and the red, green, and blue color filters to display images of various colors.

Accordingly, referring to FIG. 6, which is a circuit diagram of one pixel formed in any one liquid crystal panel, as described above, the gate line 152 and the data line 154 vertically and horizontally define pixels, and the gate line 152 is formed. And a thin film transistor T connected to the data line 154, a pixel electrode and a common electrode connected to the thin film transistor T, and a liquid crystal layer therebetween.

In this case, reference numeral 156 is a storage capacitor for supplementing the capacitance of the liquid crystal capacitor 158, and is connected in parallel with the liquid crystal capacitor 158.

On the other hand, the tiled large-area liquid crystal display according to the present invention has a particular configuration in order to control the decrease in luminance appearing at the junction S 'of each of these liquid crystal panels A', B ', C', and D '. This will be described in more detail with reference to FIG. 4, which is a cross-sectional view taken along line IV-IV of FIG. 3.

In this case, the following description will be made to be appreciated that the same description is applied to the junction S 'between the first and second liquid crystal panels A' and B 'as well as other liquid crystal panels.

First, in the tiled large-area liquid crystal display device according to the present invention, the first and second liquid crystal panels A 'and B' have a lower substrate 102a and 102b with the liquid crystal layers 103a and 103b interposed therebetween. As mentioned above, the upper substrates 104a and 104b face each other, and sealant seal patterns 110a and 110b of sealants are formed at edges of the liquid crystal panels A 'and B', respectively, so that upper and lower substrates may be formed. 102a, 102b, 104a, and 104b are sealed.

Each of the liquid crystal panels A 'and B' on which the seal patterns 110a and 110b are formed is bonded on the same plane by the tiling agent 120, and each of the liquid crystal panels A 'and B' covers the bonding portions S '. Side black matrices 112a and 112b are interposed inside the edges of the liquid crystal panels A 'and B'. In this case, each of the side black matrices 112a and 112b may be formed of the same material in the same process as the black matrices provided in the liquid crystal panels A 'and B', and preferably each of the liquid crystal panels A 'and B'. ') May be formed on the upper substrates 104a and 104b.

Therefore, the center tiling agent 120 and the seal patterns 110a and 110b and the side black matrices 112a and 112b positioned at both sides thereof form a joint S. FIG.

Next, the backlight assembly 130 is provided at the rear of the first and second liquid crystal panels A 'and B' bonded to each other, and supplies light forwardly. It is preferable that it is a direct type provided with the side-by-side cold cathode fluorescent lamp as the light source 132.

On the other hand, the above description may be somewhat similar to the general case, in particular the present invention is characterized in that the predetermined light scattering film 200 is interposed between the backlight assembly 130 and each liquid crystal panel (A ', B'). The light emitted from the backlight assembly 130 to the bonding portion S 'is divided into two centers of the tiling agent 120, and the side black matrices 112a and 112b of the liquid crystal panels A' and B 'are provided. ) It deflects outward.

Therefore, the light irradiated to the bonding portion S 'is refracted with respect to the tiling agent 120, respectively, so that the display regions outside the side black matrices 112a and 112b of the first and second liquid crystal panels A' and B '. Is concentrated.

To this end, the light scattering film 200 may be a prism sheet in which triangular patterns are uniformly arranged as shown in FIG. 4. Each triangular pattern is an acid rising as it moves away from each other based on the tiling material 120. 202 and the valley 204 which descends gradually. In addition, the peaks 202 of each triangular pattern proceeding in opposite directions with respect to the tiling material 120 have a gentle slope in the blocking portion S ′, and thus the hypotenuse is close to a right triangle toward the tiling material 120. Although the shape is gradually increasing, the slope of each mountain 202 is suddenly increased so that the shape substantially close to the isosceles triangle is repeatedly repeated outside the blocking area S '.

In other words, the light scattering film 200 may be expressed as the refractive index decreases as the light scattering film 200 proceeds in opposite directions with respect to the tiling agent 120, and thus the light irradiated from the backlight assembly to the blocking portion S ′ is respectively. The side black matrix of 112a and 112b is refracted outward.

On the liquid crystal panels A 'and B', lenses 136a and 136b are provided outside the side black matrices 112a and 112b, respectively, and these lenses 136a and 136b are respectively formed by the light scattering film 200. The light refracted and concentrated out of the side black matrices 112a and 112b is refracted toward the junction S '.

Therefore, the light flow in the blocking area is in the same direction as the dotted arrow.

Next, a diffusion plate 140 is interposed in front of these lenses 136a and 136b, which diffusely reflects light and spreads the light evenly.

Therefore, in comparison with the general case, the light scattering film 200 irradiates the light emitted from the backlight assembly 130 to the bonding portion S ′, and the side black matrix is further separated from each other based on the tiling agent 120. 112a and 112b are refracted to the outside, and the light propagated in such a path is secondarily refracted closer to each other toward the blocking area S 'by the lenses 136a and 136b on the liquid crystal panel A'B'. Finally, diffuser plate 140 diffusely reflects forward.

In summary, the light from the backlight assembly 130 toward the blocking region S 'is concentrated by the light scattering film 200 to the outside of each side black matrix 112a and 112b, and then dispersed by the lenses 136a and 136b. Therefore, the luminance at the junction portion S 'and its vicinity is not much different from other display areas.

In this case, the brightness of the bonding part may be arbitrarily controlled according to the purpose by freely adjusting the pattern of the light scattering film 200, which is obvious to those skilled in the art through the foregoing description, and thus, an improved image may be realized.

The tiled large-area liquid crystal display according to the present invention can significantly eliminate the phenomenon that the brightness of the junction portion is relatively low, which has the advantage of uniformly adjusting the overall brightness.

Therefore, it is possible to prevent screen division, which has been conventionally pointed out in a tiled large-area liquid crystal display device, thereby displaying an improved image with more uniform brightness.

Claims (4)

The liquid crystal layer and the upper and lower substrates facing each other with the liquid crystal layer interposed therebetween with at least one edge interposed therebetween, and the one side of the side with the side black matrix interposed on the same plane through a tiling agent. At least two liquid crystal panels bonded to each other; A backlight assembly emitting light forward from the rear of the two or more liquid crystal panels bonded to each other; The tiling agent is interposed between the backlight assembly and the at least two liquid crystal panels bonded to each other, and the light is irradiated from the backlight assembly to the bonding portion covered by the tiling agent and each side black matrix positioned at both sides thereof. A light scattering film which bisects as a reference and refracts the respective side black matrices outward; A lens provided on each of the liquid crystal panels and refracting the light refracted by the light scattering film to the upper portion of the bonding portion; And a diffuser plate provided in front of the lens to scatter light forward. The method of claim 1, And said light scattering film is a prism sheet having a plurality of triangular patterns formed thereon. 3. The method of claim 2, The triangular pattern is a tiled large-area liquid crystal display device characterized in that the refractive index gradually decreases in the direction overlapping with each other on the basis of the tiling agent in a portion overlapping the junction portion. 3. The method of claim 2, And the triangular pattern is symmetrical with respect to the junction part.

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