KR20200082021A - Display device having minimized bezel - Google Patents

Abstract

The present invention relates to a display device capable of minimizing a bezel thereof. The display device comprises: a first substrate and a second substrate which include a plurality of pixels; a liquid crystal layer disposed between the first substrate and the second substrate; a thin film transistor formed in each pixel of the first substrate; a protective layer formed on the first substrate to cover the thin film transistor; a black matrix formed on the second substrate to block light transmitted to an image non-display area; an overcoat layer formed on the second substrate; a seal pattern disposed between the first substrate and the second substrate to bond the first substrate and the second substrate together; and an inorganic layer formed on at least one of between the first substrate and the seal pattern and between the second substrate and the seal pattern.

Description

Display device with minimized bezel {DISPLAY DEVICE HAVING MINIMIZED BEZEL}

The present invention relates to a display device, and more particularly, to a display device that does not cause a problem in sealing or adhesion even when the bezel is minimized.

2. Description of the Related Art Recently, as the society has entered a full-fledged information age, the display field that processes and displays a large amount of information has rapidly developed, and recently, in particular, a liquid crystal display device having excellent performance of light weight, thinness, and low power consumption (Liquid) Flat panel display devices such as Crystal Display Device (LCD), organic light emitting display devices, plasma display panels (PDPs), and electrophoretic display devices have been developed to replace conventional cathode ray tubes.

In recent years, research has been actively conducted to minimize the width of a bezel of a display device in order to reduce the overall weight and size of the display device by minimizing a non-display area and to make the display device and appearance beautiful. There may be various methods to minimize the bezel, but the most efficient method is to reduce the area of the outer area of the display device.

The dummy area is not an area in which an actual image is implemented, but an area in which a bezel of the display device is located. Therefore, if the dummy area is reduced, the area of the bezel is reduced by the reduced area, so reducing the area of the dummy area is the best way to reduce the area of the bezel.

However, since the dummy area is an area for bonding and sealing a substrate of a display device, when reducing this area, not only does the problem of detachment of the adhered substrate due to a decrease in the adhesion force, but also moisture from the outside due to a decrease in the sealing force. A problem occurs that moisture such as this penetrates into the display device and the display device becomes defective.

An object of the present invention is to provide a display device capable of effectively blocking moisture penetration while preventing a decrease in adhesion by adding an inorganic layer on a failure turn to solve the above problems.

Another object of the present invention is to extend the failure turn to the black matrix to increase the formation area of the failure turn to improve the adhesion and provide a display device capable of blocking moisture penetration.

In order to achieve the above object, the display device according to the present invention includes a first substrate and a second substrate including a plurality of pixels; A liquid crystal layer disposed between the first substrate and the second substrate; A thin film transistor formed in each pixel of the first substrate; A protective layer formed on the first substrate to cover the thin film transistor; A black matrix formed on the second substrate to block light transmitted to the non-image display area; An overcoat layer formed on the second substrate; A failure turn disposed between the first substrate and the second substrate to bond the first substrate and the second substrate; It is composed of an inorganic layer formed between at least one of the first substrate and the failure turn and between the second substrate and the failure turn.

The inorganic layer is a first inorganic layer disposed between the first substrate and the failure turn, wherein the first inorganic layer extends to side cross-sections of the first and second bonded substrates and the bonded first adhesive layer. It is exposed to the outside through the side ends of the first substrate and the second substrate.

In addition, the protective layer is extended to the failure turn, and the first inorganic layer is disposed in a partial region or the entire region between the protective layer and the failure turn.

The inorganic layer is a second inorganic layer disposed between the second substrate and the failure turn, wherein the second inorganic layer extends to the side cross-sections of the first and second bonded substrates and the first bonded substrate. It is exposed to the outside through side ends of the substrate and the second substrate.

The overcoat layer is extended to the failure turn, the second inorganic layer is disposed in a part or the entire region between the overcoat layer and the failure turn, and the black matrix is extended to the failure turn, so that the second inorganic layer is the It is placed in some area between the Black Matrix and the failed turn.

Further, at least one groove is formed at the end of the black matrix of the sealing region.

In addition, the display device according to the present invention includes a first substrate and a second substrate including a plurality of pixels; A liquid crystal layer disposed between the first substrate and the second substrate; A thin film transistor formed in each pixel of the first substrate; A protective layer formed on the first substrate to cover the thin film transistor; A black matrix formed on the second substrate to block light transmitted to the non-image display area; An overcoat layer formed on the second substrate; And a failure turn disposed between the first substrate and the second substrate to bond the first substrate and the second substrate, wherein the overcoat layer is formed up to the liquid crystal layer, and the failure turn is on the black matrix. It is formed directly and extends to the liquid crystal layer.

In the present invention, by forming an inorganic layer at the interface between the failure turn of the first substrate and the protective layer, the interface between the failure turn of the second substrate and the overcoat layer, or the interface between the failure turn of the second substrate and the black matrix, It is possible to effectively block moisture penetration from the outside.

In addition, in the present invention, a portion of the overcoat layer of the second substrate is removed and a failure turn is formed up to this region, so that the failure turn extends over the black matrix to improve the adhesion of the failure turn and prevent moisture penetration. There will be.

1 is a schematic diagram of a display device according to the present invention.
2 is a plan view showing a pixel of a display device according to the present invention.
3A and 3B are cross-sectional views taken along line I-I' in FIG. 2, respectively, and are cross-sectional views showing the structure of the outermost pixel of the display device according to the first embodiment of the present invention.
4A and 4B are cross-sectional views taken along line I-I' in FIG. 2, respectively, and are cross-sectional views showing the structure of the outermost pixel of the display device according to the second embodiment of the present invention.
5A and 5B are cross-sectional views taken along line I-I' in FIG. 2, respectively, and are cross-sectional views showing the structure of the outermost pixel of the display device according to the third embodiment of the present invention.
6A and 6B are cross-sectional views taken along line I-I' in FIG. 2, respectively, and are cross-sectional views showing the structure of the outermost pixel of the display device according to the fourth embodiment of the present invention.
7A and 7B are cross-sectional views taken along line I-I' in FIG. 2, respectively, and are cross-sectional views showing the structure of the outermost pixel of the display device according to the fifth embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims.

The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are exemplary, and the present invention is not limited to the illustrated matters. The same reference numerals refer to the same components throughout the specification. In addition, in the description of the present invention, when it is determined that detailed descriptions of related known technologies may unnecessarily obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. When'include','have','consist of', etc. mentioned in the specification are used, other parts may be added unless'~man' is used. When a component is expressed as a singular number, the plural number is included unless otherwise specified.

In interpreting the components, it is interpreted as including the error range even if there is no explicit description.

In the case of the description of the positional relationship, for example, when the positional relationship of two parts is described as'~top','~upper','~bottom','~side', etc.,'right' Alternatively, one or more other parts may be located between the two parts unless'direct' is used.

In the case of the description of the time relationship, for example,'after','following','~after','~before', etc., when the temporal sequential relationship is described,'right' or'direct' It may also include cases that are not continuous unless it is used.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

Each of the features of the various embodiments of the present invention may be partially or wholly combined or combined with each other, technically various interlocking and driving may be possible, and each of the embodiments may be independently implemented with respect to each other or may be implemented together in an associative relationship. It might be.

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

The present invention provides a display device capable of minimizing the bezel. In particular, in the present invention, the bezel can be minimized by reducing the outer area of the sealing area of the display device.

In particular, the present invention provides a display device capable of effectively blocking moisture penetrating from the outside by improving the sealing force while minimizing the bezel by reducing the area of the sealing area by changing the sealing structure of the failure turn.

Hereinafter, a liquid crystal display device is described as an example of a display device, but the present invention is not limited to this particular type of display device, but may be applied to various display devices.

1 is a plan view showing a schematic structure of a liquid crystal display device according to the present invention.

As shown in FIG. 1, the liquid crystal display device 100 according to the present invention includes a display unit in which a plurality of pixels P defined by a plurality of gate lines GL and data lines DL are arranged in a matrix form ( AA) and an outer portion NA formed on the outer portion of the display portion AA. In this case, the outer portion NA includes a gate pad portion GP connected to the gate line GL and a data pad portion DP connected to the data line DL. Here, the gate pad part GP and the data pad part DP are formed in an edge region of the first substrate 130 that does not overlap the second substrate 140.

In addition, the gate pad unit GP supplies a gate signal supplied from the gate driving unit to the gate line GL of the display unit AA, and the data pad unit DP displays image information supplied from the data driving unit ( AA) to the data line (DL).

Although not shown in the drawing, each pixel P of the display unit AA of the first substrate 130 includes a thin film transistor, a liquid crystal layer that controls a transmittance of light incident from the outside, and a liquid crystal layer to realize an actual image, and the thin film A pixel electrode and a common electrode are arranged to switch the liquid crystal molecules of the liquid crystal layer by forming an electric field when an image signal is applied from the outside while being connected to the transistor.

In addition, although not shown in the drawing, a color filter layer and a black matrix are formed on the display portion AA of the second substrate 130.

A seal pattern (160) formed on the outer portion (NA) in a state where the first substrate 130 and the second substrate 140 configured as described above maintain a constant cell gap by a spacer. The liquid crystal layer is formed between the first substrate 130 and the second substrate 140 to complete the liquid crystal display device 100.

The liquid crystal layer may be formed in various ways. As shown in the figure, the failure turn 160 is formed as a closed curve on the first substrate 130 or the second substrate 140, and the first substrate 130 or the second on which the failure turn 160 is formed. After dropping the liquid crystal on the substrate 140, the first substrate 130 and the second substrate 140 may be bonded to form a liquid crystal layer.

In addition, the failure turn 160 is formed so that an opening is formed on one side without forming a closed curve, and after the first substrate 130 and the second substrate 140 are bonded, the first substrate bonded through the opening ( The liquid crystal layer may be formed by injecting liquid crystal between the 130 and the second substrate 140.

2 is a plan view showing the structure of one pixel in the display area AA of the display device 100 according to the present invention. Although substantially N×M pixels are arranged in a matrix in the display device 100 according to the present invention, only one pixel is illustrated in the drawings for convenience of description.

As shown in FIG. 2, the display device 100 according to the present invention includes a plurality of gate lines 103 and data lines 105 defining a plurality of pixels, a thin film transistor disposed in each pixel, and It is composed of a common electrode 122 and a pixel electrode 124 disposed in the pixel area.

The thin film transistor is connected to the gate line 103 and is a gate electrode 111 to which a scanning signal is applied from the outside, and is disposed on the gate electrode 111 and is activated as a scanning signal is applied to the gate electrode 111 to activate the channel. Supplying the image signal applied through the data line 105 to the pixel electrode 124 in the pixel region as the semiconductor layer 113 forming the and the semiconductor layer 113 disposed on the semiconductor layer 113 is activated It consists of a source electrode 114 and a drain electrode 115.

The common electrode 122 is formed in substantially the same shape as the shape of the pixel area over the entire area of the pixel area, and a common electrode line 123 is disposed between adjacent pixel areas to be disposed in the adjacent pixel area. The electrode 122 is electrically connected.

The pixel electrode 124 is disposed to overlap the common electrode 122 with an insulating layer interposed therebetween. At this time, a portion of the pixel electrode 124 is removed to form a plurality of strip-shaped slits 124a in a direction parallel to the gate line 103 or slightly inclined with the gate line 103. When an image signal is applied to the pixel electrode 124 through the source electrode 114 and the drain electrode 115 of the thin film transistor, the two long sides of the slit 124a of the pixel electrode 124 and the lower common electrode 122 ), an electric field substantially perpendicular to the surface of the liquid crystal display device 100 is generated, and liquid crystal molecules of the liquid crystal layer are arranged by the electric field to control the transmittance of light passing through the liquid crystal layer, thereby realizing an image.

3A is a cross-sectional view taken along line I-I' of FIG. 1 and line II-II' of FIG. 2, and the failure turns of the pixel and the outer portion NA of the display unit AA of the display device according to the first embodiment of the present invention. It is a figure showing the structure of the concrete.

3A, the display device 110 according to the first exemplary embodiment of the present invention includes a first substrate 130 and a second substrate 140 and a liquid crystal layer 150 therebetween.

A thin film transistor is formed on the display portion AA of the first substrate 130. The thin film transistor includes a gate electrode 111 formed on the first substrate 130 and a first substrate 130 on which the gate electrode 111 is formed. ) Consists of a gate insulating layer 134 formed over the entirety, a semiconductor layer 113 formed on the gate insulating layer 134, and a source electrode 114 and a drain electrode 115 formed on the semiconductor layer 113. do.

The first substrate 130 may be made of a hard transparent material such as glass, or may be made of a transparent and flexible plastic such as polyimide.

The gate electrode 111 may be formed of a single layer or a plurality of layers made of a metal such as Cr, Mo, Ta, Cu, Ti, Al, or alloys thereof, but is not limited thereto. The gate insulating layer 134 may be formed of a single layer or a two layer structure composed of inorganic materials. At this time, the inorganic material is composed of SiOx or SiNx, but is not limited thereto.

The semiconductor layer 113 may be formed of an amorphous silicon, crystalline silicon, or an oxide semiconductor such as Indium Gallium Zinc Oxide (IGZO), but is not limited thereto.

The source electrode 114 and the drain electrode 115 may be composed of a single layer or a plurality of layers made of Cr, Mo, Ta, Cu, Ti, Al, or alloys thereof, but are not limited thereto.

A protective layer 136 is formed over the entire first substrate 130 on the thin film transistor. The protective layer 136 may be formed of an organic material such as photoacrylic, but is not limited thereto, and may be composed of two layers of an inorganic layer and an organic layer, or a plurality of layers of an inorganic layer, an organic layer, and an inorganic layer. It may be configured.

The common electrode 122 is formed on the display portion AA on the gate insulating layer 134, and the pixel electrode 124 is formed on the protective layer 136. The pixel electrode 124 is electrically connected to the drain electrode 116 of the thin film transistor through a contact hole formed in the protective layer 136. At this time, the common electrode 122 is integrally formed over the entire pixel P in the form of a dummy, and the pixel electrode 124 includes a plurality of slits 124a having a set width.

The common electrode 122 and the pixel electrode 124 are transparent metals such as indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), aluminum zinc oxide (AZO), SnO2, or ZnO. It may be composed of oxide or metal.

In the drawing, the common electrode 122 is formed on the gate insulating layer 134 and the pixel electrode 124 is formed on the protective layer 136, but the common electrode 122 is formed on the first substrate 130 and the pixel electrode 124 may be formed on the protective layer 136, the common electrode 122 may be formed on the protective layer 136, and the pixel electrode 124 may be formed on the gate insulating layer 134.

The second substrate 140 is disposed in an image non-display area, a black matrix (142) that blocks light from being transmitted to the area, and a color filter layer (144) formed on the pixel (P) to realize the actual color. ) And an overcoat layer 146 to planarize the second substrate 140 is formed.

The black matrix 142 is composed of an opaque metal oxide such as CrO or CrOx or a black resin, but is not limited thereto. The color filter layer 144 is composed of R, G, and B color filter layers containing pigments or dyes. The overcoat layer 146 may be formed of an organic material such as photoacrylic.

The first substrate 130 and the second substrate 140 are adhered by a failure turn 160 formed in the outer portion NA, and the liquid crystal between the adhered first substrate 130 and the second substrate 140 Layer 150 is formed.

The failure turn 160 may be made of a sealant including glass fibers. At this time, the sealant may include a polymer and a thermosetting resin or a photocurable resin. The failure turn 160 is the outer surface of at least one of the first substrate 130 and the second substrate 140 by various printing methods such as a screen printing method, a roll printing method, and a dispensing printing method. After application to the periphery, it can be formed by applying light or heat and curing.

The failure turn 160 not only bonds the first substrate 130 and the second substrate 140, but also seals the outside of the display device 100 to prevent moisture from entering the display device 100 from outside. . Therefore, the failure turn 160 should be made of a material having good adhesion and low moisture permeability.

Moreover, in order to manufacture the display device 100 of a recent narrow bezel, the area of the failure turn 160 must be reduced, so that the first and second substrates 130 and 140 are reduced. In order to sufficiently adhere and effectively block moisture from the outside, the failure turn 160 must be formed of a new material having better adhesion and improved moisture permeability.

However, when a new material is used, not only does the cost of the sealant increase, but also the process conditions for applying and curing the sealant must all be changed, so the manufacturing process must be replaced and the process redesigned, which is time and cost consuming. .

In the present invention, the first substrate 130 and the second substrate 140 are adhered using the existing sealant, the display device 100 is adhered and sealed, but the structure of the sealing area in which the failure turn 160 is formed is changed. By doing so, it is possible to improve the bonding strength and lower the moisture permeability.

In the conventional display device, the failure turn 160 is disposed between the first substrate 130 and the second substrate 140 such that the failure turn 160 is the surface of the first substrate 130 and the second substrate 140. In direct contact with. In addition, a portion of the failure turn 160 extends between the protective layer 136 formed as the uppermost layer of the first substrate 130 and the overcoat layer 146 formed as the uppermost layer of the second substrate 140, and the failure turn ( 160) may directly contact the protective layer 136 and the overcoat layer 146.

According to the present invention, evaluating the moisture permeability and adhesion of the organic material, the inorganic material, and the sealant forming the protective layer 136 and the overcoat layer 146 are as follows.

In terms of moisture permeability, the moisture permeability of the organic material forming the protective layer 136 and the overcoat layer 146 is the highest as about 65-67 barrer, and the moisture permeability of the sealant is the next highest as about 11-30 barrer. The moisture permeability is about 0.0001-0.005, which is much lower than that of organic materials and sealants.

In addition, in terms of bonding strength, the bonding strength of the sealant and ITO is the highest as about 11-12 kgF/cm ² , and the bonding strength of the sealant and the inorganic material is the next highest as about 7-13 kgF/cm ² , and the sealant and The adhesion strength of the organic material is about 2-7 kgF/cm ² , the lowest. However, the difference in adhesion strength is not as great as the difference in moisture permeability.

Considering the moisture permeability and difference force of each material as described above, it can be seen that the sealant has good adhesion, but the moisture permeability is much higher than that of the inorganic material, and the inorganic substance is superior in moisture permeability and the adhesion is slightly lower than that of the sealant. Therefore, in the present invention, instead of lowering the moisture permeability caused by the failure turn 160 much (that is, instead of improving the sealing force much), the adhesive strength is reduced by using the inorganic material, while maintaining the existing bonding strength almost the same. It is possible to more effectively prevent moisture from penetrating into the display device 100.

Referring back to FIG. 3A, the first substrate 130 and the second substrate 140 are exposed outside the display device 100. In addition, the side surface of the end of the black matrix 142 formed on the second substrate 140 is covered by the extended overcoat layer 146.

The failure turn 160 is formed between the first substrate 130 and the second substrate 140 and between the protective layer 136 of the first substrate 130 and the overcoat layer 146 of the second substrate 140. . That is, the failure turn 160 is formed with a convex protrusion on the inner side of the display device 100, and the protrusion is disposed between the protective layer 136 and the overcoat layer 146.

A first inorganic layer 138 is formed between the failure turn 160 and the protective layer 136 of the first substrate 130, and the overcoat layer 146 of the failure turn 160 and the second substrate 140 is formed. ), a second inorganic layer 162 is formed. Therefore, the failure turn 160 and the protective layer 136 do not directly contact the first substrate 130, and the failure turn 160 and the overcoat layer 146 do not directly contact the second substrate 140.

The first inorganic layer 138 and the second inorganic layer 162 may be composed of a single layer or a plurality of layers made of an inorganic material. In this case, the inorganic material may be SiOx or SiNx, but is not limited thereto.

In general, the penetration of moisture into the display device 100 may directly penetrate a specific film, but is also possible through the interface between the film and the film. In the present invention, the first inorganic layer (which is relatively small in moisture permeability) between the failure turn 160 and the protective layer 136 does not form an interface with the failure turn 160 and the protective layer 136 having relatively high moisture permeability ( By arranging 138, it is possible to effectively prevent moisture from penetrating through the interface between the failure turn 160 and the protective layer 136.

In addition, the second inorganic layer 162, which has a relatively small moisture permeability, does not form an interface between the failure turn 160 and the overcoat layer 146, which have relatively high moisture permeability, and has a much smaller moisture permeability between the failure turn 160 and the overcoat layer 146. ) To effectively prevent moisture from penetrating through the interface between the failure turn 160 and the overcoat layer 146.

In addition, since the first inorganic layer 138 and the second inorganic layer 162 directly contact the first substrate 130 and the second substrate 140, respectively, the first substrate 130 and the second substrate 140 ) It is also possible to effectively block moisture penetrating through the surface.

In addition, in the central region of the failure turn 160, since the sealing length 1 is sufficiently long, moisture penetration from the outside can be sufficiently blocked. On the other hand, although the sealing length ℓ2 in the vicinity of the first substrate 130 and the second substrate 140 is smaller than the sealing length ℓ1 in the central region (ℓ1>ℓ2), the first substrate 130 and Since the first inorganic layer 138 and the second inorganic layer 162 are disposed near the second substrate 140, moisture penetration through this region can be effectively prevented.

As described above, in this embodiment, by adding the first inorganic layer 138 and the second inorganic layer 162 to the sealing area where the failure turn 160 is disposed, the first substrate 130 and the second substrate 140 are It is possible to easily block the penetration of moisture without lowering the adhesion.

3B is a view showing another structure of the display device 100 according to the first embodiment of the present invention. Since the display device 100 of this structure has the same configuration as the display device 100 of the structure shown in FIG. 3A except for the black matrix 142, description of the same configuration will be omitted and only other configurations will be described. do.

As shown in FIG. 3B, in the display device 100 having this structure, a first inorganic layer 138 is formed between the failure turn 160 and the protective layer 136 of the first substrate 130, and the failure turn A second inorganic layer 162 is formed between the 160 and the overcoat layer 146 of the second substrate 130 to prevent moisture penetration from outside.

At this time, a plurality of grooves 142a are formed at the ends of the black matrix 142. Although not clearly shown in the drawing, the groove 142a is continuously formed from one side of the display device 100 to the other side, and is formed as a strip-shaped groove 142a having a set width, thereby forming a plurality of black matrixes at the ends ( 142) are separated from each other. An overcoat layer 146 may be formed inside the groove 146a, that is, between the black matrix 142 and the black matrix 142, or a second inorganic layer 162 may be formed.

The groove 142a of the black matrix 142 increases the length of the interface of the black matrix 142, thereby increasing the moisture permeation path to make it more difficult to penetrate water from the outside. In addition, since the adhesive area is increased by the grooves 142a of the black matrix 142, it is possible to improve the bonding strength of the first substrate 130 and the second substrate 140.

4A and 4B are cross-sectional views showing structures of the display unit AA and the outer portion NA of the display device 200 according to the second embodiment of the present invention. At this time, since the display device 200 of this embodiment has the same structure as the display device 100 of the first embodiment shown in FIGS. 3A and 3B except for the sealing area, the description of the same structure will be omitted and different Only the configuration will be described.

As shown in FIG. 4A, in this embodiment, a first inorganic layer 238 is formed between the failure turn 260 and the protective layer 236 of the first substrate 230, and the failure turn 250 and the A second inorganic layer 238 is formed between the two substrates 240. The first inorganic layer 238 is formed on a side surface of the end of the protective layer 236 to cover the end of the protective layer 236. The overcoat layer 246 of the second substrate 240 extends to the side surface of the end of the black matrix 242 to cover the side surface of the end of the black matrix 242, and the second inorganic layer 262 has an overcoat layer ( 246) is formed on the end side of the overcoat layer 246 to cover the end side.

In this embodiment, the first inorganic layer 238 and the second inorganic layer 262 are exposed on a side end surface of the display device 200. That is, the failure turn 260 is disposed between the protective layer 236 of the first substrate 230 and the overcoat layer 246 of the second substrate 240 to extend to the end of the display device 200, so that the seal The pattern 260 is formed only in a central region between the first substrate 230 and the second substrate 240, and the first inorganic layer 238 is located near the first substrate 230 and the second substrate 240, respectively. And a second inorganic layer 262 is formed.

In the display device 200 of this embodiment, the failure turn 260 and the protective layer 236 having relatively high moisture permeability do not form an interface, and the moisture permeability between the failure turn 260 and the protective layer 236 is much smaller. By arranging the first inorganic layer 238, it is possible to effectively prevent moisture from penetrating through the interface between the failure turn 260 and the protective layer 236.

In addition, the second inorganic layer 262 having a relatively low moisture permeability between the failure turn 260 and the overcoat layer 246 without forming an interface between the failure turn 260 and the overcoat layer 246 having relatively high moisture permeability is formed. By arranging, it is possible to effectively prevent moisture from penetrating through the interface between the failure turn 260 and the overcoat layer 246.

The failure turn 260 is exposed to the outside in the central region of the side cross-section of the display device 200, but the first inorganic layer 238 and the second inorganic layer are adjacent to the first substrate 230 and the second substrate 240. Since the 262 is directly exposed to the outside, it is possible to completely block the penetration of moisture into the display device 200 through the surfaces of the first substrate 230 and the second substrate 240.

As shown in FIG. 4B, the structure of the display device 200 of this structure is the same as that of the display device 200 of FIG. 4A except for the black matrix 242. That is, in the display device 200 having this structure, a plurality of grooves 242a are formed at the ends of the black matrix 242, and an overcoat layer 246 is formed inside the grooves 242a. In addition, a second inorganic layer 262 is formed on a part of the upper surface and a side surface of the black matrix 244 at the end of the black matrix 242 separated by the groove 242a.

In the display device 200 of this structure, the grooves 242a of the black matrix 242 increase the moisture permeation path at the interface of the black matrix 242, making moisture penetration from the outside more difficult, and the black matrix 242. Since the adhesive area is increased by the grooves 242a, the bonding force between the first substrate 230 and the second substrate 240 can also be improved.

5A and 5B are cross-sectional views showing the structure of the display device 300 according to the third embodiment of the present invention. At this time, since the display device 300 of this embodiment has the same structure as the display device 100 of the first embodiment shown in FIGS. 3A and 3B except for the sealing area, the description of the same configuration will be omitted and different Only the configuration will be described.

As shown in FIG. 5A, in this embodiment, the overcoat layer 346 formed on the second substrate 340 is disposed only up to the region where the liquid crystal layer 350 is formed, and the overcoat layer 346 is not formed in the sealing region. Does not. At this time, the second inorganic layer 362 is directly formed on the black matrix 342 of the region where the overcoat layer 346 is removed, that is, the outer region, and the second weapon is between the black matrix 342 and the failure turn 360. Layer 362 is disposed.

The second inorganic layer 362 is also formed on a side end surface of the end of the black matrix 342 to cover the side end surface of the black matrix 342. The second inorganic layer 362 and the overcoat layer 346 are spaced apart at a predetermined distance, and the black matrix 342 is exposed between the spaced areas. A failure turn 360 is formed in the exposed area, and the black matrix 342 and the failure turn 360 contact through the exposed area.

Since the first inorganic layer 338 and the second inorganic layer 362 are formed near the first substrate 330 and the second substrate 340, respectively, and extend to the ends of the display device 300, the first substrate In the vicinity of the 330 and the second substrate 340, the first inorganic layer 338 and the second inorganic layer 362 are exposed to the outside through the side surface of the display device 300, respectively.

The failure turn 360 is disposed between the protective layer 336 of the first substrate 330 and the overcoat layer 346 of the second substrate 340, and extends to the sealing area with the same thickness to display device 300 It is exposed to the outside through the side section of the.

In the display device 300 of this embodiment, the failure turn 360 and the protective layer 336 of the first substrate 330 do not form an interface, and by disposing the first inorganic layer 338 therebetween, the failure turn ( 360) and the protective layer 336 can effectively prevent moisture from penetrating through the interface. In addition, in this embodiment, by disposing the second inorganic layer 362 between the black matrix 342 and the failure turn 360 of the second substrate 340, the interface between the failure turn 360 and the black matrix 342 is established. Through this, it is possible to effectively prevent the penetration of moisture.

Also, in the vicinity of the first substrate 330 and the second substrate 340, the first inorganic layer 338 and the second inorganic layer 362 are exposed to the outside through the side cross-section of the display device directly. It is possible to completely block the penetration of moisture.

As shown in FIG. 5B, the structure of the display device 300 of this structure is the same as that of the display device 300 of FIG. 5A except for the black matrix 342. That is, in the display device 300 having this structure, a plurality of grooves 342a are formed at the ends of the black matrix 342, and a second inorganic layer 362 is formed inside the grooves 342a.

In the display device 300 of this structure, the grooves 342a of the black matrix 342 increase the moisture permeation path at the interface of the black matrix 342, making moisture penetration from the outside more difficult, and the black matrix 342. Since the adhesive area is increased by the grooves 342a, the bonding force between the first substrate 330 and the second substrate 340 can also be improved.

6A and 6B are cross-sectional views showing the structure of the display device 400 according to the fourth embodiment of the present invention. At this time, since the display device 400 of this embodiment has the same structure as the display device 100 of the first embodiment shown in FIGS. 3A and 3B except for the sealing area, the description of the same configuration will be omitted and different Only the configuration will be described.

As shown in FIG. 6A, in this embodiment, the overcoat layer 446 formed on the second substrate 440 is disposed only up to the region where the liquid crystal layer 450 is formed, and the overcoat layer 446 is not formed in the sealing region. Does not. At this time, a failure turn 460 is directly formed on the black matrix 442 of the region where the overcoat layer 446 is removed, that is, the outer region, so that the black matrix 442 and the failure turn 460 are in direct contact.

In the display device 400 having this structure, since the overcoat layer 446 is not formed on the second substrate 440 and the failure turn 460 directly contacts the black matrix 442, the bonding area of the failure turn 460 is reduced. Can be increased. Therefore, it is possible to increase the bonding force between the first substrate 430 and the second substrate 440.

Although, the black matrix 442 and the failure turn 460 form an interface, moisture may penetrate through the interface. However, since the contact area between the black matrix 442 and the fail turn 460 is formed long to the area of the liquid crystal layer 450, the penetration path through which moisture penetrates is formed long enough to minimize penetration of moisture.

Meanwhile, an inorganic layer 438 is formed between the protective layer 436 of the first substrate 430 and the failure turn 460, and the inorganic layer 438 extends to an end near the first substrate 430 to Since the inorganic layer 438 is exposed to the outside through the side end of the display device 400, it is possible to prevent the penetration of moisture through this region.

As shown in FIG. 6B, the structure of the display device 400 of this structure is the same as that of the display device 400 of FIG. 6A except for the black matrix 442. That is, in the display device 400 having this structure, a plurality of grooves 442a are formed at an end of the black matrix 442, and a failure turn 460 is formed inside the groove 442a.

In the display device 400 of this structure, the groove 442a of the black matrix 442 increases the moisture permeation path at the interface between the black matrix 442 and the failure turn 460, making it more difficult to penetrate moisture from the outside. In addition, since the adhesive area is increased by the grooves 442a of the black matrix 442, the bonding strength of the first substrate 430 and the second substrate 440 can also be improved.

As shown in FIG. 7A, in this embodiment, the first inorganic layer 538 is formed in a region between the fail turn 560 and the protective layer 536 of the first substrate 530, and the fail turn 560 ) And a second inorganic layer 562 is formed in a portion of the overcoat layer 546 between the second substrate 540.

As shown in FIG. 7A, in this embodiment, the first inorganic layer 438 is formed in a region between the fail turn 560 and the protective layer 536 of the first substrate 530, and the fail turn 560 ) And a second inorganic layer 538 is formed in a portion of the overcoat layer 546 between the second substrate 540.

The first inorganic layer 538 is formed on a side surface of the end of the protective layer 536 to cover the side surface of the end of the protective layer 536, and the first inorganic layer through a side end surface of the display device 500 538 is exposed to the outside. In addition, the overcoat layer 546 of the second substrate 540 is formed to cover the top and side surfaces of the black matrix 542, and the second inorganic layer 562 is formed on the side surface of the end of the overcoat layer 546. The second inorganic layer 562 is exposed to the outside through the side cross-section of the display device 500.

In addition, the failure turn 560 contacts the protective layer 536 of the first substrate 530 and the overcoat layer 546 of the second substrate 540, respectively. That is, the lower surface of the failure turn 560 contacts the protective layer 536 and the first inorganic layer 538 of the first substrate 530, and the upper surface of the failure turn 560 is of the second substrate 540. The overcoat layer 546 and the second inorganic layer 562 are contacted.

At this time, since the first inorganic layer 538 is formed on a portion of the upper surface and the side surface of the protective layer 536, a step is formed on the surfaces of the protective layer 536 and the first inorganic layer 538. In addition, since the second inorganic layer 562 is formed on a portion of the upper surface and the side surface of the overcoat layer 546, a step is formed on the surfaces of the overcoat layer 546 and the second inorganic layer 562.

Accordingly, the thickness of the failure turn 560 formed between the protective layer 536 of the first substrate 530 and the overcoat layer 546 of the second substrate 540 is the first inorganic layer 538 and the second. It is greater than the thickness of the failure turn 560 formed between the inorganic layer 562. Conversely, in this embodiment, the area of the failure turn 560 exposed to the outside through the side surface of the display device 500 is relatively reduced, and the first weapon exposed to the outside through the side surface of the display device 500. Since the areas of the layer 538 and the second inorganic layer 562 are relatively increased, it is possible to more effectively block moisture penetrating through the side cross-section of the display device 500.

In addition, in the display device 500 of this embodiment, the first inorganic layer 538 is disposed in a partial region between the failure turn 560 and the protection layer 536 to interface the failure turn 560 and the protection layer 536. Through this, it is possible to minimize the penetration of moisture. In addition, by disposing the second inorganic layer 562 in some areas between the failure turn 560 and the overcoat layer 546, the penetration of moisture through the interface between the failure turn 560 and the overcoat layer 546 can be minimized. It becomes possible.

As shown in FIG. 7B, the structure of the display device 500 of this structure is the same as that of the display device 500 of FIG. 7A except for the black matrix 542. That is, in the display device 500 having this structure, a plurality of grooves 542a are formed at the ends of the black matrix 542, and an overcoat layer 546 is formed inside the grooves 542a.

Therefore, the groove 542a of the black matrix 542 increases the moisture permeation path at the interface of the black matrix 542, making water penetration from the outside more difficult, and the groove 542a of the black matrix 542. Since the adhesive area is increased, it is possible to improve the bonding strength of the first substrate 530 and the second substrate 540.

Various modifications of the present invention and structures that can be easily created based on the present invention should also be included in the scope of the present invention. Therefore, the scope of the present invention should not be determined by the detailed description described above, but should be determined by the appended claims.

130,230,330,430,530: 1st board
140,240,340,440,540: Second board
136,236,336,436,536: Protective layer
138,238,338,438,538,162,262,362,562: inorganic layer
142,242,342,442,542: Black Matrix
146,246,346,446,546: Overcoat layer
150,250,350,450,550: Liquid crystal layer
160,260,360,460,560: Failure turn

Claims (16)

A first substrate and a second substrate including a plurality of pixels;
A liquid crystal layer disposed between the first substrate and the second substrate;
A thin film transistor formed in each pixel of the first substrate;
A protective layer formed on the first substrate to cover the thin film transistor;
A black matrix formed on the second substrate to block light transmitted to the non-image display area;
An overcoat layer formed on the second substrate;
A failure turn disposed between the first substrate and the second substrate to bond the first substrate and the second substrate; And
A display device comprising an inorganic layer formed on at least one of the first substrate and the failure turn and between the second substrate and the failure turn. The display device of claim 1, wherein the inorganic layer is a first inorganic layer disposed between the first substrate and the failure turn. The display device of claim 2, wherein the first inorganic layer extends to side surfaces of the bonded first substrate and the second substrate and is exposed to the outside through the side surfaces of the bonded first substrate and the second substrate. The display device of claim 2, wherein the protective layer extends with a failure turn, and the first inorganic layer is disposed in a partial region between the protection layer and the failure turn. The display device of claim 2, wherein the protection layer extends to the failure turn, and the first inorganic layer is disposed in an entire area between the protection layer and the failure turn. The display device of claim 1, wherein the inorganic layer is a second inorganic layer disposed between the second substrate and the failure turn. The display device of claim 6, wherein the second inorganic layer extends to side surfaces of the bonded first and second substrates and is exposed to the outside through the side surfaces of the bonded first and second substrates. The display device of claim 6, wherein the overcoat layer is extended to the fail turn, and the second inorganic layer is disposed in a partial region between the overcoat layer and the fail turn. The display device of claim 6, wherein the overcoat layer is extended to the fail turn, and the second inorganic layer is disposed in an entire area between the overcoat layer and the fail turn. The display device of claim 6, wherein the black matrix is extended to the failure turn, and the second inorganic layer is disposed in a partial region between the black matrix and the failure turn. The display device of claim 10, wherein the second inorganic layer and the overcoat layer are arranged at a predetermined distance apart, and a failure turn is formed in the spaced apart area. The display device according to any one of claims 7 to 10, wherein at least one groove is formed at an end of the black matrix in an area where the failure turn is formed. A first substrate and a second substrate including a plurality of pixels;
A liquid crystal layer disposed between the first substrate and the second substrate;
A thin film transistor formed in each pixel of the first substrate;
A protective layer formed on the first substrate to cover the thin film transistor;
A black matrix formed on the second substrate to block light transmitted to the non-image display area;
An overcoat layer formed on the second substrate; And
It is disposed between the first substrate and the second substrate and consists of a failure turn for bonding the first substrate and the second substrate,
The overcoat layer is formed up to the liquid crystal layer, and the failure turn is formed directly on the black matrix to extend to the liquid crystal layer. The display device of claim 13, further comprising an inorganic layer formed between the first substrate and the failure turn. 15. The display device of claim 14, wherein the inorganic layer extends to side surfaces of the bonded first and second substrates and is exposed to the outside through the side surfaces of the bonded first and second substrates. The display device of claim 13, wherein at least one groove is formed at an end of the black matrix in an area where the failure turn is formed.

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