KR102617295B1 - Display DEVICE Having Edge Bending Structure - Google Patents

Abstract

The present invention relates to a display device having an edge bending structure. The display device having an edge bending structure according to an embodiment of the present invention is divided into a bending area in which at least one side is bent and a non-bending area in which the top surface is flat. A display panel comprising: upper and lower substrates disposed in a display area; upper and lower PI (polyimide) substrates disposed in a non-display area; and disposed in the non-display area between the upper and lower PI substrates. It can be composed of a thread pattern that is
Therefore, while solving the problems of side light leakage and afterimages that occur in display devices with an edge bending structure, there is no deterioration in image quality by applying glass as a substrate to the display area, and the bezel area can be folded to minimize the bezel. . Additionally, manufacturing costs can be reduced by partially applying expensive PI and not using a viewing angle improvement polarizer.

Description

Display device having an edge bending structure {Display DEVICE Having Edge Bending Structure}

The present invention relates to a display device, and more particularly, to a display device having an edge bending structure.

Recently, as interest in information displays has increased and the demand for using portable information media has increased, there has been a growing trend for lightweight thin-film flat panel displays (FPDs) to replace conventional display devices, cathode ray tubes (CRTs). Research and commercialization are being focused on.

Among flat panel display devices, a liquid crystal display device (LCD) is a device that displays images using the optical anisotropy of liquid crystal. It is actively applied to laptops and desktop monitors due to its excellent resolution, color display, and image quality.

The liquid crystal display device is largely composed of a color filter substrate, an array substrate, and a liquid crystal layer formed between the color filter substrate and the lower substrate.

The design elements of these display devices have become important factors in determining the purchase of display devices, and accordingly, research and development are being conducted to allow display devices to have various forms. An example of a display device with an improved design is a display device having an edge bending structure in which the edges (or sides) of the display device are bent.

Meanwhile, many efforts are being made to reduce the bezel area for aesthetics. However, even if high-integration technology is applied, there are limits to minimizing the bezel area due to the presence of a non-display area in the liquid crystal display device.

The purpose of the present invention, designed to overcome the above problems, is to provide a display device that bends a non-display area to the side and has an edge bending structure including a flat top non-bending area and a curved side bending area.

Meanwhile, when transparent polyimide (PI) is used instead of glass as the upper and lower substrates for this purpose, an expensive viewing angle improvement polarizer is essential to improve viewing angle light leakage due to the refractive index of transparent PI. Additionally, PI substrates are more difficult to dissipate heat than glass substrates, and as a result, image quality issues such as afterimages may be problematic.

Accordingly, another object of the present invention is to provide a display device that uses glass as a substrate in the display area and PI as a substrate in the non-display area, and has an edge bending structure that does not use an expensive viewing angle improvement polarizer.

Another object of the present invention is to provide a display device having an edge bending structure that can fundamentally prevent side light leakage.

The problems of the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below.

A display device having an edge bending structure according to an embodiment of the present invention includes a display panel divided into a bending area with at least one side bent and a non-bending area with a flat top, wherein the display panel is disposed in the display area. upper and lower substrates, upper and lower PI (polyimide) substrates in contact with the sides of the upper and lower substrates, respectively, and disposed in a non-display area, and a thread pattern disposed in the non-display area between the upper and lower PI substrates. It can be composed of .

Specific details of other embodiments are included in the detailed description and drawings.

The present invention solves the problems of side light leakage and afterimages that occur in display devices with an edge bending structure and prevents deterioration of image quality. Additionally, by folding the bezel area, it is possible to minimize the bezel and differentiate the design.

In addition, it provides the effect of reducing manufacturing costs by partially applying expensive PI and not using a viewing angle improvement polarizer.

The effects according to the present invention are not limited to the contents exemplified above, and further various effects are included in the present specification.

1 is a block diagram for explaining the structure of a display device according to an embodiment of the present invention.
Figure 2 is a plan view exemplarily showing a display device according to an embodiment of the present invention.
Figure 3 is a perspective view schematically showing a display panel according to an embodiment of the present invention.
FIG. 4 is a diagram showing a cross section cut along line AA of the display panel shown in FIG. 3.
FIG. 5A is a diagram schematically showing a cross section of a display device according to an embodiment of the present invention.
FIG. 5B is an enlarged view showing part A of the display device shown in FIG. 5A.
FIG. 6 is a diagram illustrating gate wiring outside the display area in the display device shown in FIG. 2 .
7 and 8 are diagrams showing an example of strain reduction wiring according to an embodiment of the present invention.
FIG. 9 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.
FIG. 10 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.
FIG. 11 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.
FIG. 12 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.
13A to 13L are plan views sequentially showing a method of manufacturing a display device according to an embodiment of the present invention.
14A to 14G are cross-sectional views sequentially showing a method of manufacturing a display device according to an embodiment of the present invention.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and will be implemented in various different forms, but the present embodiments only serve to ensure that the disclosure of the present invention is complete and are within the scope of common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are illustrative, and the present invention is not limited to the matters shown. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. are used in this specification, other parts may be added unless 'only' is used. In cases where a component is expressed in the singular, the plural is included unless specifically stated otherwise.

When interpreting components, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship between two parts is described as 'on top', 'on top', 'on the bottom', 'next to', etc., 'right away' or Unless 'directly' is used, there may be one or more other parts placed between the two parts.

The fact that an element or layer is referred to as being on another element or layer includes all cases where another layer or other element is interposed directly on or in the middle of another element.

Although first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are merely used to distinguish one component from another. Accordingly, the first component mentioned below may also be the second component within the technical spirit of the present invention.

Like reference numerals refer to like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of explanation, and the present invention is not necessarily limited to the size and thickness of the components shown.

Each feature of the various embodiments of the present invention can be partially or fully combined or combined with each other, and as can be fully understood by those skilled in the art, various technical interconnections and operations are possible, and each embodiment may be implemented independently of each other. It may be possible to conduct them together due to a related relationship.

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

1 is a block diagram for explaining the structure of a display device according to an embodiment of the present invention.

Figure 2 is a plan view exemplarily showing a display device according to an embodiment of the present invention.

Below, a liquid crystal display device is used as an example as a display device, but the present invention is not limited thereto.

1 and 2, the liquid crystal display device according to an embodiment of the present invention is divided into a display area (AA) and a non-display area (NA), and pixels (SP) are formed in a matrix in the display area (AA). The display panel 100 is arranged in a matrix type, the backlight 170 is disposed at the bottom of the display panel 100 and provides a light source, and is mounted in the non-display area (NA) of the display panel 100 to display pixels ( It may be composed of a driving unit for driving SP) and a power supply unit 160.

The driver may be composed of a gate driver 140, a data driver 130, and a timing driver 150.

Additionally, the driver may include a driving integrated circuit (IC) for applying a data signal and a gate signal to each of the data line DL and the gate line GL of the display panel 100. Depending on the method of mounting the driver IC on the display panel 100, Chip On Glass (COG), Tape Carrier Package (TCP), Chip On Film (COF) It is divided into: Additionally, the driver may be formed on the display panel 100 in the form of a gate in panel (GIP).

The timing driver 150 may receive a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a data enable signal (Data Enable (DE)), a clock signal (CLK), and a data signal (DATA).

At this time, the timing driver 150 uses timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a data enable signal (Data Enable; DE), and a clock signal (CLK) to control the data driver 130. ) and the operation timing of the gate driver 140 can be controlled. Meanwhile, since the timing driver 150 can determine the frame period by counting the data enable signal DE of one horizontal period, the vertical synchronization signal Vsync and the horizontal synchronization signal Hsync may be omitted. The control signals generated by the timing driver 150 include a gate timing control signal (GDC) for controlling the operation timing of the gate driver 140 and a data timing control signal (DDC) for controlling the operation timing of the data driver 130. ) may be included.

The gate timing control signal (GDC) may include a gate start pulse (GSP), gate shift clock (GSC), and gate output enable signal (GOE). A gate start pulse (GSP) can be supplied to the gate drive IC where the first gate signal is generated. The gate shift clock (GSC) is a clock signal commonly input to gate drive ICs and is a clock signal for shifting the gate start pulse (GSP). The gate output enable signal (GOE) can control the output of gate drive ICs.

Additionally, the data timing control signal (DDC) may include a source start pulse (SSP), a source sampling clock (SSC), a source output enable signal (SOE), etc. The source start pulse (SSP) can control the data sampling start point of the data driver 130. The source sampling clock (SSC) is a clock signal that controls the sampling operation of data within the data driver 130 based on a rising or falling edge. The source output enable signal (SOE) can control the output of the data driver 130. Meanwhile, the source start pulse (SSP) supplied to the data driver 130 may be omitted depending on the data transmission method.

The display panel 100 may include a thin film transistor substrate (hereinafter referred to as a lower substrate), a color filter substrate (hereinafter referred to as an upper substrate), and a liquid crystal layer injected between them, and pixels arranged in a matrix form. (SP) may be included.

Additionally, the display panel 110 may include a seal pattern 180 made of sealant for bonding the upper substrate and the lower substrate. The thread pattern 180 may be formed in the non-display area (NA) at the edges of the upper and lower substrates.

A data line (DL), a gate line (GL), a TFT, a storage capacitor, etc. may be formed on the lower substrate, and a black matrix, a color filter, etc. may be formed on the upper substrate.

One pixel (SP) may be defined by a data line (DL) and a gate line (GL) that intersect each other.

One pixel (SP) includes a TFT driven by a gate signal supplied through the gate line (GL), a storage capacitor that stores the data signal supplied through the data line (DL) as a data voltage, and a data voltage stored in the storage capacitor. A liquid crystal cell driven by may be included. The liquid crystal cell can be driven by the data voltage supplied to the pixel electrode and the common voltage supplied to the common electrode. The common electrode is formed on the upper substrate in vertical electric field driving methods such as TN mode and VA (Vertical Alignment) mode, and is formed on the pixel electrode in horizontal electric field driving methods such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. Together, they can be formed on the lower substrate. The common electrode can receive a common voltage from the common voltage wiring.

A polarizing plate may be attached to the lower substrate and the upper substrate of the display panel 100 configured as described above, and an alignment film may be formed to set the pre-tilt angle of the liquid crystal. The liquid crystal mode of the display panel 100 may be implemented in any liquid crystal mode in addition to the above-described TN mode, VA mode, IPS mode, and FFS mode.

The gate driver 140 provides a signal with a swing width of the gate driving voltage at which the TFT of the pixel SP included in the display panel 100 can operate in response to the gate timing control signal (GDC) supplied from the timing driver 150. Gate signals are sequentially generated by shifting the level of . The gate driver 140 may supply the gate signal generated through the gate wire GL to the pixel SP included in the display panel 100. As described above, the gate driver 140 may be mounted on the display panel 100 in an IC form or may be formed on the display panel 100 in a GIP form.

In addition, the data driver 130 samples and latches the data signal DATA supplied from the timing driver 150 in response to the data timing control signal DDC supplied from the timing driver 150 to generate parallel data. It can be converted into system data. When converting to data in a parallel data system, the data signal (DATA) can be converted to a gamma reference voltage.

Additionally, the data driver 130 may supply the converted data signal DATA to the pixel SP included in the display panel 100 through the data line DL. The data driver 130 may be mounted on the display panel 100 in an IC format or may be formed on the display panel 100 in a GIP format.

A data link line (DLL) and a gate link line (GLL) connected to the data line (DL) and the gate line (GL), respectively, may be formed in the non-display area (NA). Additionally, a data pad and a gate pad may be connected to the ends of the data link line (DLL) and the gate link line (GLL), respectively.

The data pad and gate pad may be connected to the data driving IC and gate driving IC mounted on the lower substrate, respectively.

The data driving IC and gate driving IC can be connected to an external printed circuit board through FPC. This printed circuit board may include a timing driver 150 and a power supply unit 160. However, the present invention is not limited to this.

The backlight 170 may provide light to the display panel 100. The backlight 170 may include a light source that emits light, a light guide plate that guides light to the display panel 100, and an optical sheet that condenses and diffuses light.

The power supply unit 160 may convert input power (Vin) supplied from the outside into direct current power and output a common voltage (Vcom), a first high voltage (Vdd), and a second high voltage (Vcc).

The common voltage (Vcom) may be supplied to the common voltage wire, while the first high voltage (Vdd) may be supplied to the gate driver 140 and the data driver 130, and the second high voltage (Vcc) may be supplied to the timing driver 150. can be supplied to The power supply unit 160 may be mounted on a printed circuit board connected to the display panel 100. However, the present invention is not limited to this.

Referring to FIG. 2 , as described above, the display panel 100 may be divided into a display area AA and a non-display area NA surrounding the display area AA.

The display area (AA) is defined as an area that displays an image, and the non-display area (NA) is an area that does not display an image and may be defined as a bezel area.

Pixels SP formed in a matrix form may be formed in the display area AA.

On the other hand, in the non-display area (NA), various wiring such as a data link line (DLL), a gate link line (GLL), and a common voltage wiring, a gate driver 140, a data driver 130, and a connection portion may be formed. .

Although FIG. 2 shows an example in which the gate driver 140 is formed on both sides of the display panel 100, the present invention is not limited to this. The gate driver 140 may be formed on one side of the display panel 100.

The data link line (DLL) may be arranged to supply the data signal output from the data driver 130 to the data line of the pixel (SP), and the gate link line (GLL) may be arranged to supply the gate signal output from the gate driver 140. may be arranged to be supplied to the gate wiring of the pixel SP. Additionally, the common voltage wiring may be arranged so that the common voltage output from the power supply unit is supplied to the common electrode of the pixel SP.

There are various ways in which the data link line (DLL), gate link line (GLL), and common voltage line formed in the non-display area (NA) are connected to the data line, gate line, and common electrode formed in the display area (AA), respectively. Illustrations and descriptions thereof are omitted.

The connection unit may be electrically connected to an external printed circuit board so that various external power supplies and signals are supplied to the driving unit and common voltage wiring.

Meanwhile, the display device of the present invention is characterized by bending a portion of the display panel 110 to the side and having an edge bending structure including a non-bending area on the flat upper surface and a bending area on the curved side, see the drawings. This is explained in detail.

Figure 3 is a perspective view schematically showing a display panel according to an embodiment of the present invention.

FIG. 4 is a diagram showing a cross section taken along line A-A of the display panel shown in FIG. 3 and schematically shows a partial cross section of the display area.

As described above, a liquid crystal display device is used as an example of a display device, but the present invention is not limited thereto.

Referring to FIGS. 3 and 4 , the display panel 100 according to an embodiment of the present invention may be divided into a bending area (BA) with a side surface bent and a non-bending area (NBA) with a flat side that is not bent.

The bending area BA may include a non-display area. The bending area BA may include the entire non-display area and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas BA, and for example, as shown in FIG. 3, one bending area BA may be located on both edges (or sides). Such a display device may be referred to as a display device having an edge bending structure.

The non-bending area (NBA) may include a display area.

As described above, the display panel 100 according to an embodiment of the present invention may be divided into a display area, which is an area for displaying an image, and a non-display area outside the display area.

In addition, the display panel 100 according to an embodiment of the present invention may include an upper substrate 105 and a lower substrate 110 and a liquid crystal layer 120 injected between the upper and lower substrates 105 and 110. It may also include pixels arranged in a matrix form.

In the display area of the lower substrate 110, a plurality of gate wires and a plurality of data wires may be formed to intersect to define a pixel area. Additionally, a thin film transistor may be formed as a switching element in the pixel area, and a pixel electrode and a common electrode may be formed for forming an electric field.

Although not shown in detail, a buffer layer may be disposed on the lower substrate 110. The buffer layer can minimize the infiltration of moisture or impurities from the lower substrate 110.

For example, the buffer layer may be composed of a single layer or multiple layers of silicon oxide (SiOx) or silicon nitride (SiNx), but is not limited thereto.

A light blocking layer may be disposed between the lower substrate 110 and the buffer layer. The light blocking layer blocks light incident from the bottom of the thin film transistor to the active layer of the thin film transistor. When light is irradiated to the active layer of a thin film transistor, leakage current may occur, reducing the reliability of the thin film transistor. Accordingly, the light blocking layer is disposed below the active layer of the thin film transistor to block light incident on the thin film transistor to minimize leakage current.

The light blocking layer may be made of an opaque conductive material. The light blocking layer may be made of, for example, copper (Cu), aluminum (Al), molybdenum (Mo), nickel (Ni), titanium (Ti), chromium (Cr), or an alloy thereof, but is not limited thereto. .

A thin film transistor may be disposed on the buffer layer. Thin film transistors can be used as driving elements in liquid crystal displays. A thin film transistor may include an active layer, a gate electrode, a source electrode, and a drain electrode.

For example, a gate electrode may be disposed on the buffer layer, and a gate insulating layer may be disposed on the gate electrode.

A gate wire may be disposed in a first direction on the same layer as the gate electrode.

The gate electrode and gate wiring are made of aluminum (Al), aluminum alloy (Al alloy), tungsten (W), copper (Cu), copper alloy, molybdenum (Mo), silver (Ag), silver alloy (Ag alloy), and gold. (Au), gold alloy (Au alloy), chromium (Cr), titanium (Ti), titanium alloy (Ti alloy), moly tungsten (MoW), moly titanium (MoTi), copper/moly titanium (Cu/MoTi) It may be comprised of at least one selected from the group of conductive metals, or a combination of two or more thereof, or other suitable materials.

The gate insulating layer includes a silicon (Si)-based oxide film, a nitride film, or a compound containing the same, a metal oxide film containing Al ₂ O ₃ , an organic insulating film, and a low dielectric constant (low-k) value. It may include materials that have For example, the gate insulating layer may be made of silicon oxide (SiO ₂ ), silicon nitride (SiNx), zirconium oxide (ZrO ₂ ), hafnium oxide (HfO ₂ ), titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂ O ₅ ), Any one selected from the group consisting of barium-strontium-titanium-oxygen compound (Ba-Sr-Ti-O) and bismuth-zinc-niobium-oxygen compound (Bi-Zn-Nb-O), or two or more thereof It may be comprised of combinations, or other suitable substances.

An active layer may be disposed on the gate insulating layer, and a source electrode extending from the data line and a drain electrode facing and spaced apart from the source electrode may be disposed on the active layer.

The data wire may be arranged in a second direction crossing the first direction and, together with the gate wire, may partition the pixel area.

The active layer may include a channel region, a source region, and a drain region. The channel region is a region that overlaps the gate electrode. When a voltage is applied to the gate electrode, a channel is formed to electrically connect the source region and the drain region. The source region and drain region are regions electrically connected to the source electrode and drain electrode, respectively.

For example, the active layer may be patterned at the same time as the data line and the source/drain electrodes, and in this case, it may be patterned to have the same shape as the source/drain electrodes.

The active layer according to an embodiment of the present invention may be composed of an oxide semiconductor.

The oxide semiconductor includes one or more materials selected from the group consisting of germanium (Ge), tin (Sn), lead (Pb), indium (In), titanium (Ti), gallium (Ga), and aluminum (Al), and zinc ( It may be made of a material in which silicon (Si) is added to an oxide semiconductor containing Zn). As an example, the active layer may be made of silicon indium zinc oxide (Si-InZnO: SIZO), in which silicon ions are added to indium zinc complex oxide (InZnO).

Oxide semiconductors include, in addition to the above-mentioned materials, Group I elements such as lithium (Li) or potassium (K), Group II elements such as magnesium (Mg), calcium (Ca) or strontium (Sr), gallium (Ga), and aluminum. Group III elements such as (Al), indium (In) or yttrium (Y), Group IV elements such as titanium (Ti), zirconium (Zr), silicon (Si), tin (Sn) or germanium (Ge), tantalum Group V elements such as (Ta), vanadium (V), niobium (Nb), or antimony (Sb), or lantinium (La), cerium (Ce), praseodymium (Pr), terbium (Tb), or neodymium (Nd). , promethium (Pm), samarium (Sm), europium (Eu), gadolidium (Gd), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), or ruthenium. Lanthanum (Ln) series elements such as (Lu) may be further included.

Source/drain electrodes and data wiring are made of aluminum (Al), aluminum alloy (Al alloy), tungsten (W), copper (Cu), copper alloy, molybdenum (Mo), silver (Ag), and silver alloy (Ag alloy). , gold (Au), gold alloy (Au alloy), chromium (Cr), titanium (Ti), titanium alloy (Ti alloy), moly tungsten (MoW), moly titanium (MoTi), copper/moly titanium (Cu/MoTi) ), or a combination of two or more thereof, or other suitable materials.

A protective layer may be disposed on the lower substrate 110 including source/drain electrodes and data lines.

The protective layer is a silicon (Si)-based oxide film, nitride film, or a compound containing the same, a metal oxide film containing Al ₂ O ₃ , an organic insulating film, and a material with a low dielectric constant (low-k) value. may include. And, the protective layer is, for example, silicon oxide (SiO ₂ ), silicon nitride (SiNx), zirconium oxide (ZrO ₂ ), hafnium oxide (HfO ₂ ), titanium oxide (TiO ₂ ), and tantalum oxide (Ta ₂ O ₅ ). , any one selected from the group consisting of barium-strontium-titanium-oxygen compound (Ba-Sr-Ti-O) and bismuth-zinc-niobium-oxygen compound (Bi-Zn-Nb-O), or two thereof It may be comprised of a combination of the above, or other suitable substances.

A common electrode and a pixel electrode may be formed in the pixel area above the protective layer.

The pixel electrode may include a box-shaped common electrode and a plurality of slits within the pixel electrode to generate a fringe field. That is, a common electrode and a pixel electrode for generating a fringe field are formed within the pixel area. The common electrode is formed in a single pattern across the entire display area, and the pixel electrode is formed in a box shape within the pixel area, while each It may be formed to have multiple slits within the pixel area. However, the present invention is not limited to this.

The common electrode and the pixel electrode may be made of a transparent conductive material.

The common electrode and the pixel electrode are, for example, tin oxide (Tin Oxide), indium tin oxide (ITO), indium zinc oxide (IZO), and indium tin zinc oxide (Indium Zinc Tin). Oxide; ITZO), etc., but is not limited thereto.

The common electrode may have a plate shape within the pixel area, but may have a first opening in a predetermined area. This first opening may be formed in the contact hole area where the drain electrode is exposed. This is to prevent a short from occurring when electrically connecting the drain electrode and the pixel electrode through the contact hole. That is, if the common electrode does not have a first opening, a short circuit will occur between the common electrode and the pixel electrode during electrical connection between the pixel electrode and the drain electrode. To prevent this, the common electrode must have a first opening in the contact hole area. may be provided.

Additionally, the common electrode may have a second opening in the thin film transistor area. This is because if the common electrode is formed in the thin film transistor area, it may interfere with the movement of electrons in the channel area of the active layer. However, the present invention is not limited to this.

Additionally, the common electrode may have a third opening in the non-display area.

The pixel electrode may be connected to the drain electrode through a contact hole.

The upper substrate 105 includes a color filter composed of red, green, and blue sub-color filters, a black matrix that distinguishes between the sub-color filters and blocks light passing through the liquid crystal layer 120, and a color filter and It may consist of an overcoat layer formed on the black matrix. However, when the display panel 100 is a COT (Color Filter on TFT array) type, the black matrix and color filter may be provided on the upper surface of the lower substrate 110.

A column spacer is formed between the upper substrate 105 and the lower substrate 110 to maintain a constant cell gap between the upper substrate 105 and the lower substrate 110.

Additionally, an upper polarizer 101 may be attached to the upper substrate 105 of the display panel 100, and a lower polarizer 111 may be attached to the lower substrate 110. Additionally, an alignment film for setting a pre-tilt angle of the liquid crystal may be formed on the inner surfaces of the upper substrate 105 and the lower substrate 110 in contact with the liquid crystal layer 120.

FIG. 5A is a diagram schematically showing a cross section of a display device according to an embodiment of the present invention.

FIG. 5B is an enlarged view of part A of the display device shown in FIG. 5A, and also shows a part of the backlight disposed below the display panel.

FIGS. 5A and 5B show an example of a display device with an edge bending structure in which both sides of the display panel are partially bent to the side and includes a non-bending area (NBA) on the flat top surface and a bending area (BA) on the curved side. .

As described above, a liquid crystal display device is used as an example of a display device.

Referring to FIGS. 5A and 5B, the liquid crystal display device according to an embodiment of the present invention includes a display panel 100 in which pixels are arranged in a matrix form in the display area, and a display disposed below the display panel 100. It may be composed of a backlight 170 that provides a light source to the panel 100, and a driver that is mounted in the non-display area (NA) of the display panel 100 to drive pixels.

The display panel 100 may be divided into a bending area (BA) with a side surface that is bent and a non-bending area (NBA) with a flat side that is not bent.

The bending area BA may include a non-display area NA. The bending area BA may include the entire non-display area NA and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas BA, and for example, as shown in FIG. 5A, one bending area BA may be located on both edges (or sides). Such a display device may be referred to as a display device having an edge bending structure.

The non-bending area (NBA) may include a display area.

As described above, the display panel 100 may include an upper substrate 105 and a lower substrate 110 and a liquid crystal layer 120 injected between the upper and lower substrates 105 and 110, and may also include a matrix It may include pixels arranged in a shape.

In the display area of the lower substrate 110, a plurality of gate wires and a plurality of data wires may be formed to intersect to define a pixel area. In addition, a thin film transistor may be formed as a switching element in the pixel area, and a pixel electrode and a common electrode for forming an electric field may be formed.

The upper substrate 105 includes a color filter composed of red, green, and blue sub-color filters, a black matrix that distinguishes between the sub-color filters and blocks light passing through the liquid crystal layer 120, and a color filter. It may consist of an overcoat layer formed on top of a black matrix. However, when the display panel 100 is a COT (Color Filter on TFT array) type, the black matrix and color filter may be provided on the upper surface of the lower substrate 110.

A column spacer is formed between the upper substrate 105 and the lower substrate 110 to maintain a constant cell gap between the upper substrate 105 and the lower substrate 110.

Additionally, the display panel 110 may include a seal pattern 180 made of sealant for bonding the upper substrate 105 and the lower substrate 110.

The thread pattern 180 may be disposed in the bending area BA.

The thread pattern 180 includes a first thread pattern 180a disposed at one end of the non-display area adjacent to the display area and a second thread pattern 180b disposed at the other end of the non-display area (NA). It can be configured. The second seal pattern 180b may be arranged at a predetermined distance from the first seal pattern 180a. That is, the seal pattern 180 is composed of first and second seal patterns 180a and 180b to prevent deterioration of the active layer in the GIP when the sealant hardens, and the sealant may not be placed between them. there is. However, the present invention is not limited to this, and the thread pattern 180 of the present invention is not divided into two thread patterns, but may be composed of one single pattern.

Additionally, a black matrix BM may be further disposed between a portion of the bending area BA, for example, between the upper PI substrate 102 and the seal pattern 180, to cover the bezel area. The black matrix BM may be arranged to cover the thread pattern 180 and extend into the display area to cover a portion of the liquid crystal layer 120 . However, the present invention is not limited to this.

In addition, an upper polarizer 101 may be attached to the upper substrate 105 of the display panel 100, a lower polarizer 111 may be attached to the lower substrate 110, and an upper substrate ( An alignment film may be formed on the inner surface of 105) and the lower substrate 110 to set the pre-tilt angle of the liquid crystal.

As an example, the upper polarizer 101 may include a first support, a second support, and a first polarizing element located between the first support and the second support. Additionally, the lower polarizing plate 111 may include a third support, a fourth support, and a second polarizing element located between the third and fourth supports.

The first and second polarizing elements may be made of polyvinyl alcohol (PVA). The first and third supports may be made of a protective film without retardation, and may be made of, for example, tri-acetyl cellulose (TAC). In addition, the second and fourth supports may be made of a protective film without phase delay to protect the first and second polarizing elements, for example, 0-RT (refers to a modified TAC with Rth close to 0 nm, , 0-TAC) or COP (Cyclo-Olefin-Polymer).

The backlight 170 may provide light to the display panel 100. The backlight 170 may include a light source that emits light, a light guide plate that guides light to the display panel 100, and an optical sheet that condenses and diffuses light.

The display panel 100 and backlight 170 configured in this way can be accommodated and fixed in the guide panel 175.

The curved bending area BA of the display panel 100 may be attached to the side of the backlight 170, and an end of the bending area BA may be seated on the top of the guide panel 175. Additionally, an adhesive means such as an adhesive tape may be interposed between them.

Meanwhile, along with recent research and development in the technical aspects of display devices, the need for research and development in product design that can be more appealing to consumers has been highlighted. Accordingly, efforts are being made to slim down the thickness of display devices, and in order to meet the design needs of consumers, a narrow bezel type that reduces the area of the outer border or a borderless type that removes the outer border is used. Research and development is being conducted on a borderless type liquid crystal display device.

The display device according to an embodiment of the present invention is characterized by bending a portion of the side surface of the display panel 110 and having an edge bending structure including a flat non-bending area (NBA) and a bending area (BA) bent to the side. do.

In particular, the display device having an edge bending structure according to an embodiment of the present invention uses glass as the upper and lower substrates 105 and 110 in the display area and the PI substrates 102 and 112 in the non-display area NA. By using , it is characterized by not using an expensive viewing angle improvement polarizer.

In other words, when transparent polyimide (PI) is used instead of glass as the upper and lower substrates, an expensive viewing angle improvement polarizer is essential to improve viewing angle light leakage due to the refractive index of transparent PI. Additionally, PI substrates are more difficult to dissipate heat than glass substrates, and as a result, image quality issues such as afterimages may be problematic. Accordingly, in the case of the present invention, the display area uses glass as the upper and lower substrates 105 and 110, thereby eliminating the use of an expensive viewing angle improvement polarizer and preventing image quality degradation and side light leakage due to the use of the PI substrate. do. Additionally, by folding the bezel area, it is possible to minimize the bezel and differentiate the design. In addition, the display area uses glass as the upper and lower substrates 105 and 110, and only the non-display area (NA) uses PI substrates 102 and 112, so expensive PI can be partially applied and a viewing angle improvement polarizer is used. This provides the effect of reducing manufacturing costs.

To this end, the present invention is characterized by partially bending the glass in the bending area (BA), removing some of the outermost glass, and applying the PI substrates 102 and 112 to the non-display area (NA).

The PI substrates 102 and 112 are an upper PI substrate 102 applied to the non-display area (NA) from which the upper substrate 105 was removed, and a lower PI substrate applied to the non-display area (NA) from which the lower substrate 110 was removed. It may include a substrate 112.

The upper PI substrate 102 is in contact with an end of the upper substrate 105 and may be located inside the display panel 100. Additionally, the upper PI substrate 102 may be located on the black matrix (BM). Accordingly, the upper PI substrate 102 may contact the upper surface of the black matrix (BM).

The lower PI substrate 112 is in contact with an end of the lower substrate 110 and may be located inside the display panel 100. Accordingly, the lower PI substrate 112 may contact the lower surface of the seal pattern 180.

Meanwhile, the portion from which the glass has been removed to which the PI substrates 102 and 112 are not applied may be filled with predetermined fillers 125a and 125b.

The fillers 125a and 125b are an upper filler 125a that fills the inner space between the upper PI substrate 102 and the upper polarizer 101, and a lower filler that fills the inner space between the lower PI substrate 112 and the lower polarizer 111. (125b) may be included.

The fillers 125a and 125b can block moisture and oxygen that may flow from the outside along the bending area BA. In addition, the fillers 125a and 125b support the upper and lower PI substrates 102 and 112 by filling the internal space between the upper and lower PI substrates 102 and 112 and the upper and lower polarizers 101 and 111. Accordingly, unintentional deformation of the upper and lower PI substrates 102 and 112 can be prevented.

The fillers 125a and 125b may have sufficient flexibility to be used in the bending area BA of the display device of the present invention. Additionally, the material of the fillers 125a and 125b may be a material that can be cured with low energy within a limited time so that the components beneath the fillers 125a and 125b are not damaged during the curing process. The fillers 125a and 125b may be formed of photocurable acrylic resin. In order to suppress the penetration of unwanted moisture through the fillers 125a and 125b, one or more getters may be mixed into the fillers 125a and 125b.

In addition, in the present invention, in order to prevent the thread pattern 180 from bursting, the thread pattern 180 is separated into first and second thread patterns 180a and 180b so that folding is performed on the first thread pattern 180a. ), and only horizontal wiring with increased width exists in the seal area and folding area, and the GIP thin film transistor is placed outside the folding area to block influence on device characteristics.

FIG. 6 is a diagram illustrating gate wiring outside the display area in the display device shown in FIG. 2 .

Referring to FIG. 6 , the display panel according to an embodiment of the present invention may be divided into a display area (AA) and a non-display area (NA) outside the display area.

The bending area where the side is bent may include a non-display area (NA). That is, the bending area may include the entire non-display area (NA) and a portion of the display area (AA). However, the present invention is not limited to this.

There may be one or more bending areas, and for example, one bending area may be located on both edges (or sides).

Pixels SP may be arranged in a matrix type in the display area AA of the display panel.

The display panel may include an upper substrate, a lower substrate, and a liquid crystal layer injected between them. A data line (DL), a gate line (GL), a TFT, a storage capacitor, etc. may be formed on the lower substrate.

The display panel may include a seal pattern 180 made of sealant for bonding the upper substrate and the lower substrate.

The thread pattern 180 may be formed in the non-display area (NA) at the edges of the upper and lower substrates.

The thread pattern 180 includes a first thread pattern 180a disposed at one end of the non-display area (NA) adjacent to the display area (AA) and a second thread pattern (180a) disposed at the other end of the non-display area (NA). It may be composed of a thread pattern 180b.

The second seal pattern 180b may be arranged at a predetermined distance from the first seal pattern 180a.

A predetermined folding area may be located between the first seal pattern 180a and the second seal pattern 180b. That is, in order to prevent the seal patterns 180a and 180b from bursting, the present invention separates the seal patterns 180a and 180b into the first and second seal patterns 180a and 180b so that folding is performed outside the first seal pattern 180a. You can.

In addition, the present invention allows only a horizontal wire of increased width, that is, the gate out wire 142, to exist in the seal area (i.e., the area where the first seal pattern 180a is located) and the folding area FA, and the folding area It is characterized in that the GIP portion 145 is disposed on the outside of (FA).

The gate out wiring 142 is connected to the gate wiring GL of the display area AA, and may extend outward to be connected to the thin film transistor of the GIP portion 145.

As described above, the gate out wiring 142 is characterized by having an increased width in the real area and the folding area FA.

Additionally, the gate out wiring 142 of the present invention may include a plurality of predetermined holes 143 by patterning the inside of the gate out wiring 142 to prevent cracks in the wiring during UV curing and bending of the sealant. In this way, the propagation of cracks can be blocked by the holes 143 patterned inside the gate out wiring 142, and the gate signal can be smoothly transmitted due to the increased width.

The present invention can be applied regardless of the shape of the gate out wiring 142 or the shape of the hole 143 patterned inside, and any shape can be applied as long as the strain is reduced.

7 and 8 are diagrams showing an example of strain reduction wiring according to an embodiment of the present invention.

7 and 8 show a diamond trace design for the gate out wiring as an example, but the present invention is not limited thereto.

Referring to FIGS. 7 and 8 , the gate out wiring 242 according to another embodiment of the present invention may have a diamond trace design.

A diamond trace design may be applied to a portion of the gate out wiring 242 in the bend-permitting portion. The strain-reducing trace design of the gate out wire 242 may include sub-traces arranged to extend in oblique directions from the tangent vector of the bent portion. This reduces the length of the gate out wire 242 aligned with the tangent vector of the bent portion. The distribution of bending stress depends on the vector (i.e. splitting angle) of the sub-traces relative to the bending direction. Therefore, sub-traces with a larger splitting angle from the bending direction (i.e., the tangent vector of the bent portion) will experience less bending stress.

The gate out wiring 242 may have a diamond-shaped hole 243 therein.

Meanwhile, the present invention is applicable to a borderless type with zero bezel in addition to the narrow bezel type described above, and will be described in detail with reference to the drawings.

FIG. 9 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.

FIG. 9 shows an example of a display device with an edge bending structure, in particular, a zero-bezel borderless type display device that bends a portion of the side surface of the display panel substantially vertically and includes a non-bending area on the flat upper surface and a bending area on the curved side. It's showing.

As described above, a liquid crystal display device is used as an example of a display device.

Referring to FIG. 9, a liquid crystal display device according to another embodiment of the present invention includes a display panel 200 in which pixels are arranged in a matrix form in a display area, and a display panel 200 disposed below the display panel 200. ) may be composed of a backlight that provides a light source and a driver that is mounted in the non-display area to drive the pixels.

The display panel 200 may be divided into a bending area (BA) whose side surface is bent substantially vertically and a non-bending area (NBA) whose side surface is not bent but is flat.

The bending area BA may include a non-display area. The bending area BA may include the entire non-display area and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas BA, and for example, one bending area BA may be located on both edges (or sides).

The non-bending area (NBA) may include a display area.

As described above, the display panel 200 may include an upper substrate 205 and a lower substrate 210 and a liquid crystal layer 220 injected between the upper and lower substrates 205 and 210, and may also include a matrix It may include pixels arranged in a shape.

In the display area of the lower substrate 210, a plurality of gate wires and a plurality of data wires may be formed to cross each other to define a pixel area. Additionally, a thin film transistor may be formed as a switching element in the pixel area, and a pixel electrode and a common electrode may be formed for forming an electric field.

The upper substrate 205 includes a color filter composed of red, green, and blue sub-color filters, a black matrix that distinguishes between the sub-color filters and blocks light passing through the liquid crystal layer 220, and a color filter. It may consist of an overcoat layer formed on top of a black matrix. However, when the display panel 200 is a COT (Color Filter on TFT array) type, the black matrix and color filter may be provided on the upper surface of the lower substrate 210.

A column spacer is formed between the upper substrate 205 and the lower substrate 210 to maintain a constant cell gap between the upper substrate 205 and the lower substrate 210.

Additionally, the display panel 210 may include a seal pattern 280 made of sealant for bonding the upper substrate 205 and the lower substrate 210.

The thread pattern 280 may be disposed in the bending area BA.

The seal pattern 280 may be composed of a first seal pattern 280a disposed at one end of the non-display area adjacent to the display area and a second seal pattern 280b disposed at the other end of the non-display area. there is. The second seal pattern 280b may be arranged at a predetermined distance from the first seal pattern 280a. That is, the seal pattern 280 is composed of first and second seal patterns 280a and 280b, and no sealant may be disposed between them. However, the present invention is not limited to this, and the thread pattern 280 of the present invention is not divided into two thread patterns, but may be composed of one single pattern.

Additionally, a black matrix BM may be further disposed between a portion of the bending area BA, for example, between the upper PI substrate 202 and the seal pattern 280, to cover the bezel area. The black matrix BM may be disposed to cover the seal pattern 280 and extend into the display area to cover a portion of the liquid crystal layer 220, but the present invention is not limited thereto.

In addition, an upper polarizer 201 may be attached to the upper substrate 205 of the display panel 200, a lower polarizer 211 may be attached to the lower substrate 210, and an upper substrate ( An alignment film may be formed on the inner surfaces of 205) and the lower substrate 210 to set the pre-tilt angle of the liquid crystal.

As an example, the upper polarizer 201 may include a first support, a second support, and a first polarizing element located between the first support and the second support. Additionally, the lower polarizing plate 211 may include a third support, a fourth support, and a second polarizing element located between the third and fourth supports.

The first and second polarizing elements may be made of polyvinyl alcohol (PVA). The first and third supports may be made of a protective film without retardation, and may be made of, for example, tri-acetyl cellulose (TAC). In addition, the second and fourth supports may be made of a protective film without phase delay to protect the first and second polarizing elements, for example, 0-RT (refers to a modified TAC with Rth close to 0 nm, , 0-TAC) or COP (Cyclo-Olefin-Polymer).

The backlight may provide light to the display panel 200. The backlight may include a light source that emits light, a light guide plate that guides light to the display panel 200, and an optical sheet that condenses and diffuses light.

The display panel 200 and backlight configured in this way can be accommodated and fixed in the guide panel.

The curved bending area BA of the display panel 200 may be attached to a side of the backlight, and an end of the bending area BA may be seated on the top of the guide panel. Additionally, an adhesive means such as an adhesive tape may be interposed between them.

As described above, in the display device according to another embodiment of the present invention, the display area (or non-bending area (NBA)) uses glass as the upper and lower substrates 205 and 210, and the non-display area (or non-bending area (NBA)) uses glass as the upper and lower substrates 205 and 210. , the bending area (BA) uses PI substrates 202 and 212, thereby eliminating the use of an expensive viewing angle improvement polarizer.

The PI substrates 202 and 212 include an upper PI substrate 202 applied to the bending area BA from which the upper substrate 205 was removed, and a lower PI substrate applied to the bending area BA from which the lower substrate 210 was removed ( 212) may be included.

The upper PI substrate 202 contacts an end of the upper substrate 205 and may be located inside the display panel 200. Additionally, the upper PI substrate 202 may be located on the black matrix (BM). Accordingly, the upper PI substrate 202 may contact the upper surface of the black matrix (BM).

The lower PI substrate 212 is in contact with an end of the lower substrate 210 and may be located inside the display panel 200. Accordingly, the lower PI substrate 212 may contact the lower surface of the seal pattern 280.

Meanwhile, the portion from which the glass has been removed to which the PI substrates 202 and 212 are not applied may be filled with predetermined fillers 225a and 225b.

The fillers 225a and 225b are an upper filler 225a that fills the internal space between the upper PI substrate 202 and the upper polarizer 201, and a lower filler that fills the internal space between the lower PI substrate 212 and the lower polarizer 211. It may include filler 225b.

The fillers 225a and 225b may block moisture and oxygen that may flow from the outside along the bending area BA. In addition, the fillers 225a and 225b support the upper and lower PI substrates 202 and 212 by filling the internal space between the upper and lower PI substrates 202 and 212 and the upper and lower polarizers 201 and 211. Accordingly, unintentional deformation of the upper and lower PI substrates 202 and 212 can be prevented.

The fillers 225a and 225b may have sufficient flexibility to be used in the bending area BA of the display device of the present invention. Additionally, the material of the fillers 225a and 225b may be a material that can be cured with low energy within a limited time so that the components beneath the fillers 225a and 225b are not damaged during the curing process. The fillers 225a and 225b may be formed of photocurable acrylic resin. In order to suppress the infiltration of unwanted moisture through the fillers 225a and 225b, one or more getters may be mixed into the fillers 225a and 225b.

Meanwhile, in the present invention, a PI substrate may be applied only to the folding area to prevent device defects caused by PI in the GIP portion, and this will be described in detail with reference to the drawings.

FIG. 10 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.

Figure 10 shows an example of a display device with an edge bending structure that bends a portion of the side of the display panel and includes a non-bending area on the flat top surface and a bending area on the curved side, and in particular, a display device in which a partial PI substrate is applied only to the folding area. .

As described above, a liquid crystal display device is used as an example of a display device.

Referring to FIG. 10, a liquid crystal display device according to another embodiment of the present invention includes a display panel 300 in which pixels are arranged in a matrix form in a display area, and a display panel disposed below the display panel 300. It may be composed of a backlight that provides a light source to 300 and a driver that is mounted in the non-display area to drive the pixel.

The display panel 300 may be divided into a bending area (BA) with a side surface that is bent and a non-bending area (NBA) with a flat side that is not bent.

The bending area BA may include a non-display area. The bending area BA may include the entire non-display area and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas BA, and for example, one bending area BA may be located on both edges (or sides).

The non-bending area (NBA) may include a display area.

As described above, the display panel 300 may include an upper substrate 305 and a lower substrate 310 and a liquid crystal layer 320 injected between the upper and lower substrates 305 and 310, and may also include a matrix It may include pixels arranged in a shape.

A column spacer is formed between the upper substrate 305 and the lower substrate 310 to maintain a constant cell gap between the upper substrate 305 and the lower substrate 310.

Additionally, the display panel 310 may include a seal pattern 380 made of sealant for bonding the upper substrate 305 and the lower substrate 310.

The thread pattern 380 may be disposed in the bending area BA.

And, the seal pattern 380 consists of a first seal pattern 380a disposed at one end of the non-display area adjacent to the display area and a second seal pattern 380b disposed at the other end of the non-display area. It can be.

The second seal pattern 380b may be arranged at a predetermined distance from the first seal pattern 380a. That is, the seal pattern 380 is composed of first and second seal patterns 380a and 280b, and no sealant may be disposed between them. However, the present invention is not limited to this, and the thread pattern 380 of the present invention is not divided into two thread patterns, but may be composed of one single pattern.

As described above, the display device according to another embodiment of the present invention uses glass as the upper and lower substrates 305 and 310 in the display area and partially uses PI substrates 302 and 312 in the non-display area. By doing so, it is characterized by not using an expensive viewing angle improvement polarizer.

The PI substrates 302 and 312 are part of the bending area BA from which the upper substrate 305 has been removed, for example, a bending area from which the upper PI substrate 302 and the lower substrate 310 applied to the folding area FA have been removed. It may include a lower PI substrate 312 applied to a portion of the area BA, for example, the folding area FA. Therefore, the remaining part of the bending area (BA) to which the upper PI substrate 302 is not applied and the remaining part of the bending area (BA) to which the lower PI substrate 312 is not applied are each provided with a dummy upper substrate 305' made of glass. ) and a dummy lower substrate 310' may be applied.

The upper PI substrate 302 contacts the end of the upper substrate 305 and the end of the dummy upper substrate 305' and may be located inside the display panel 300. The upper PI substrate 302 may be located on the black matrix (BM). Accordingly, the upper PI substrate 302 and the dummy upper substrate 305' may contact the upper surface of the black matrix (BM).

The lower PI substrate 312 contacts the end of the lower substrate 310 and the end of the dummy lower substrate 315' and may be located inside the display panel 300. The lower PI substrate 312 and the dummy lower substrate 315' may contact the lower surface of the seal pattern 380.

Meanwhile, the portion from which the glass has been removed to which the PI substrates 302 and 312 are not applied may be filled with predetermined fillers 325a and 325b.

The fillers 325a and 325b are the upper filler 325a, which fills the internal space between the upper PI substrate 302 and the upper polarizer 301, and the lower filler, which fills the internal space between the lower PI substrate 312 and the lower polarizer 311. It may include filler 325b.

A black matrix BM may be further disposed in a portion of the bending area BA, for example, between the upper PI substrate 302 and the seal pattern 380 and the dummy upper substrate 305' and the seal pattern 380.

The black matrix BM may be disposed to cover the thread pattern 380 and extend into the display area to cover a portion of the liquid crystal layer 320, but the present invention is not limited thereto.

In addition, an upper polarizer 301 may be attached to the upper substrate 305 of the display panel 300, a lower polarizer 311 may be attached to the lower substrate 310, and the upper substrate ( An alignment film may be formed on the inner surfaces of 305) and the lower substrate 310 to set the pre-tilt angle of the liquid crystal.

The backlight may provide light to the display panel 300. The backlight may include a light source that emits light, a light guide plate that guides light to the display panel 300, and an optical sheet that condenses and diffuses light.

The display panel 300 and backlight configured in this way can be accommodated and fixed in the guide panel.

The curved bending area BA of the display panel 300 may be attached to a side of the backlight, and an end of the bending area BA may be seated on the top of the guide panel. Additionally, an adhesive means such as an adhesive tape may be interposed between them.

As described above, the thread pattern of the present invention is not divided into two thread patterns but may be composed of a single pattern, which will be described in detail with reference to the drawings.

FIG. 11 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.

Figure 11 shows an example of a display device with an edge bending structure that bends a portion of the side of the display panel and includes a non-bending area on the flat top surface and a bending area on the curved side, particularly a display device in which the thread pattern is composed of a single pattern. there is.

As described above, a liquid crystal display device is used as an example of a display device.

Referring to FIG. 11, a liquid crystal display device according to another embodiment of the present invention includes a display panel 400 in which pixels are arranged in a matrix form in a display area, and a display panel disposed below the display panel 400. It may be composed of a backlight that provides a light source to 400 and a driver that is mounted in the non-display area to drive the pixel.

The display panel 400 may be divided into a bending area (BA) with a side surface that is bent and a non-bending area (NBA) with a flat side that is not bent.

The bending area BA may include a non-display area. The bending area BA may include the entire non-display area and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas BA, and for example, one bending area BA may be located on both edges (or sides).

The non-bending area (NBA) may include a display area.

As described above, the display panel 400 may include an upper substrate 405 and a lower substrate 410 and a liquid crystal layer 420 injected between the upper and lower substrates 405 and 410, and may also include a matrix It may include pixels arranged in a shape.

A column spacer is formed between the upper substrate 405 and the lower substrate 410 to maintain a constant cell gap between the upper substrate 405 and the lower substrate 410.

Additionally, the display panel 410 may include a seal pattern 480 made of sealant for bonding the upper substrate 405 and the lower substrate 410.

The thread pattern 480 may be disposed in the bending area BA.

The thread pattern 480 may be composed of a single pattern from one end of the non-display area adjacent to the display area to the other end.

As described above, the display device according to another embodiment of the present invention uses glass as the upper and lower substrates 405 and 410 in the display area and uses PI substrates 402 and 412 in the non-display area. , It is characterized by not using an expensive viewing angle improvement polarizer.

The PI substrates 402 and 412 include an upper PI substrate 402 applied to the non-display area from which the upper substrate 405 was removed and a lower PI substrate 412 applied to the non-display area from which the lower substrate 410 was removed. can do.

The upper PI substrate 402 contacts an end of the upper substrate 405 and may be located inside the display panel 400. Additionally, the upper PI substrate 402 may be located on the black matrix (BM). Accordingly, the upper PI substrate 402 may contact the upper surface of the black matrix (BM).

The lower PI substrate 412 is in contact with an end of the lower substrate 410 and may be located inside the display panel 400. Accordingly, the lower PI substrate 412 may contact the lower surface of the seal pattern 480.

Meanwhile, the portion from which the glass has been removed to which the PI substrates 402 and 412 are not applied may be filled with predetermined fillers 425a and 425b.

The fillers 425a and 425b are an upper filler 425a that fills the inner space between the upper PI substrate 402 and the upper polarizer 401, and a lower filler that fills the inner space between the lower PI substrate 412 and the lower polarizer 411. (425b).

Additionally, a black matrix BM may be further disposed between a portion of the bending area BA, for example, the upper PI substrate 402 and the seal pattern 480, to cover the bezel area. The black matrix BM may be arranged to cover the thread pattern 480 and at the same time extend into the display area to cover a portion of the liquid crystal layer 420 . However, the present invention is not limited to this.

In addition, an upper polarizer 401 may be attached to the upper substrate 405 of the display panel 400, a lower polarizer 411 may be attached to the lower substrate 410, and the upper substrate ( An alignment film may be formed on the inner surfaces of 405) and the lower substrate 410 to set the pre-tilt angle of the liquid crystal.

The backlight may provide light to the display panel 400. The backlight may include a light source that emits light, a light guide plate that guides light to the display panel 400, and an optical sheet that condenses and diffuses light.

The display panel 400 and backlight configured in this way can be accommodated and fixed in the guide panel.

The curved bending area BA of the display panel 400 may be attached to a side of the backlight, and an end of the bending area BA may be seated on the top of the guide panel. Additionally, an adhesive means such as an adhesive tape may be interposed between them.

FIG. 12 is a diagram schematically showing a cross section of a display device according to another embodiment of the present invention.

FIG. 12 shows a display device with an edge bending structure that includes a non-bending area on the flat top surface and a bending area on the curved side by bending a portion of the side of the display panel. In particular, a partial PI substrate is applied only to the folding area, and the thread pattern is formed into one single A display device composed of patterns is shown as an example.

As described above, a liquid crystal display device is used as an example of a display device.

Referring to FIG. 12, a liquid crystal display device according to another embodiment of the present invention includes a display panel 500 in which pixels are arranged in a matrix form in a display area, and a display panel (500) disposed below the display panel 500. 500) may be composed of a backlight that provides a light source and a driver that is mounted in the non-display area to drive the pixel.

The display panel 500 may be divided into a bending area (BA) with a side surface that is bent and a non-bending area (NBA) with a flat side that is not bent.

The bending area BA may include a non-display area. The bending area BA may include the entire non-display area and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas BA, and for example, one bending area BA may be located on both edges (or sides).

The non-bending area (NBA) may include a display area.

As described above, the display panel 500 may include an upper substrate 505 and a lower substrate 510 and a liquid crystal layer 520 injected between the upper and lower substrates 505 and 510, and may also include a matrix It may include pixels arranged in a shape.

A column spacer is formed between the upper substrate 505 and the lower substrate 510 to maintain a constant cell gap between the upper substrate 505 and the lower substrate 510.

Additionally, the display panel 510 may include a seal pattern 580 made of sealant for bonding the upper substrate 505 and the lower substrate 510.

The thread pattern 580 may be disposed in the bending area BA.

The thread pattern 580 may be composed of a single pattern from one end of the non-display area adjacent to the display area to the other end.

As described above, the display device according to another embodiment of the present invention uses glass as the upper and lower substrates 505 and 510 in the display area and partially uses PI substrates 502 and 512 in the non-display area. By doing so, it is characterized by not using an expensive viewing angle improvement polarizer.

The PI substrates 502 and 512 are part of the bending area BA from which the upper substrate 505 has been removed, for example, a bending area from which the upper PI substrate 502 and the lower substrate 510 applied to the folding area FA have been removed. It may include a lower PI substrate 512 applied to a portion of the area BA, for example, the folding area FA. Accordingly, the remaining part of the bending area (BA) to which the upper PI substrate 502 is not applied and the remaining part of the bending area (BA) to which the lower PI substrate 512 is not applied are each provided with a dummy upper substrate 505' made of glass. ) and a dummy lower substrate 510' may be applied.

The upper PI substrate 502 contacts the end of the upper substrate 505 and the end of the dummy upper substrate 505' and may be located inside the display panel 500. The upper PI substrate 502 may be located on the black matrix (BM). Accordingly, the upper PI substrate 502 and the dummy upper substrate 505' may contact the upper surface of the black matrix (BM).

The lower PI substrate 512 contacts the end of the lower substrate 510 and the end of the dummy lower substrate 515' and may be located inside the display panel 500. The lower PI substrate 512 and the dummy lower substrate 515' may contact the lower surface of the seal pattern 580.

Meanwhile, the portion from which the glass has been removed to which the PI substrates 502 and 512 are not applied may be filled with predetermined fillers 525a and 525b.

The fillers 525a and 525b are the upper filler 525a, which fills the internal space between the upper PI substrate 502 and the upper polarizer 501, and the lower filler, which fills the internal space between the lower PI substrate 512 and the lower polarizer 511. It may include filler 525b.

A black matrix BM may be further disposed in a portion of the bending area BA, for example, between the upper PI substrate 502 and the seal pattern 580 and the dummy upper substrate 505' and the seal pattern 580.

The black matrix BM may be disposed to cover the seal pattern 580 and extend into the display area to cover a portion of the liquid crystal layer 520, but the present invention is not limited thereto.

In addition, an upper polarizer 501 may be attached to the upper substrate 505 of the display panel 500, a lower polarizer 511 may be attached to the lower substrate 510, and an upper substrate in contact with the liquid crystal layer 520 ( An alignment film may be formed on the inner surfaces of 505) and the lower substrate 510 to set a pre-tilt angle of the liquid crystal.

The backlight may provide light to the display panel 500. The backlight may include a light source that emits light, a light guide plate that guides light to the display panel 500, and an optical sheet that condenses and diffuses light.

The display panel 500 and backlight configured in this way can be accommodated and fixed in the guide panel.

The curved bending area BA of the display panel 500 may be attached to a side of the backlight, and an end of the bending area BA may be seated on the top of the guide panel. Additionally, an adhesive means such as an adhesive tape may be interposed between them.

Hereinafter, a method of manufacturing a display device having an edge bending structure of the present invention will be described in detail with reference to the drawings.

13A to 13L are plan views sequentially showing a method of manufacturing a display device according to an embodiment of the present invention.

14A to 14G are cross-sectional views sequentially showing a method of manufacturing a display device according to an embodiment of the present invention.

13C to 3H show the display panel in a conveniently bonded state, with the upper side showing the display panel when looking at the upper substrate, and the lower side showing the display panel when looking at the lower substrate.

FIGS. 13I to 3K show an example where the display panel is flipped upside down so that the lower substrate is placed on top for convenience.

Below, a liquid crystal display device is used as an example as a display device, but the present invention is not limited thereto.

Referring to FIGS. 13A and 14A, upper and lower substrates 105 and 110 are prepared.

The upper substrate 105 may be a color filter substrate, and the lower substrate 110 may be a thin film transistor substrate.

The upper and lower substrates 105 and 110 may be divided into a display area, which is an area for displaying images, and a non-display area outside the display area. Pixels in the display area may be arranged in a matrix type.

The upper and lower substrates 105 and 110 may be divided into a bending area where the side surfaces are bent in a subsequent process and a non-bending area where the sides are not bent and are flat.

The bending area may include a non-display area. The bending area may include the entire non-display area and a portion of the display area. However, the present invention is not limited to this.

There may be one or more bending areas, and for example, one bending area may be located on both edges (or sides) of the upper and lower substrates 105 and 110, respectively.

The non-bending area may include a display area.

Part of the surface of the non-display area of the upper and lower substrates 105 and 110 is removed, and PI is partially coated to form upper and lower PI substrates 102 and 112 within the upper and lower substrates 105 and 110.

The upper PI substrate 102 may be applied to a non-display area from which a portion of the surface of the upper substrate 105 has been removed, and the lower PI substrate 112 may be applied to a non-display area from which a portion of the surface of the lower substrate 110 has been removed. .

The upper and lower PI substrates 102 and 112 may be formed side by side in one direction within the non-display areas of the upper and lower substrates 105 and 110, respectively.

Next, a color filter process and a thin film transistor array process can be performed on each of the upper and lower PI substrates 105 and 110 on which the upper and lower PI substrates 102 and 112 are formed.

Data wires, gate wires, TFTs, storage capacitors, etc. may be formed on the lower substrate 110, and a black matrix, color filters, etc. may be formed on the upper substrate 105.

One pixel can be defined by data lines and gate lines that intersect each other.

At this time, one pixel includes a TFT that is driven by the gate signal supplied through the gate wire, a storage capacitor that stores the data signal supplied through the data wire as a data voltage, and a liquid crystal cell that is driven by the data voltage stored in the storage capacitor. May be included. The liquid crystal cell can be driven by the data voltage supplied to the pixel electrode and the common voltage supplied to the common electrode. The common electrode is formed on the upper substrate in vertical electric field driving methods such as TN mode and VA (Vertical Alignment) mode, and is formed on the pixel electrode in horizontal electric field driving methods such as IPS (In Plane Switching) mode and FFS (Fringe Field Switching) mode. Together, they can be formed on the lower substrate. The common electrode can receive a common voltage from the common voltage wiring.

Next, referring to FIGS. 13B and 14B, the upper substrate 105 and lower substrate 110 on which the color filter process and the thin film transistor array process have been completed are bonded.

At this time, the upper and lower PI substrates 105 and 110 may be bonded so that the upper and lower PI substrates 102 and 112 face each other.

A column spacer is formed between the bonded upper and lower substrates 105 and 110 to maintain a constant cell gap between the upper and lower substrates 105 and 110.

Additionally, a liquid crystal layer may be formed between the bonded upper and lower substrates 105 and 110.

Additionally, a seal pattern made of sealant may be formed in the non-display area between the bonded upper and lower substrates 105 and 110.

Next, the upper and lower surfaces of the bonded upper and lower substrates 105 and 110 are entirely etched (along the SL line) to reduce the thickness of the upper and lower substrates 105 and 110 to about ~0.08T. there is. However, the present invention is not limited to this, and etching may not be performed.

Next, referring to FIGS. 13C and 14C, both sides of the upper and lower substrates 105 and 110 may be scribed to expose the ends of the upper and lower PI substrates 102 and 112.

Next, referring to FIGS. 13D and 14D, a portion of the surface of the upper substrate 105 may be etched to expose the surface of the upper PI substrate 102. Figure 14d shows an example where the entire surface of the upper PI substrate 102 is exposed, but the present invention is not limited to this.

Next, referring to FIGS. 13E and 14E, the upper filler 125a is coated and filled in the upper substrate 105 where the upper PI substrate 102 is exposed.

The upper filler 125a may have sufficient flexibility to be used in the bending area. The upper filler 125a may be a material that can be cured with low energy in a limited time so that the components underneath the upper filler 125a are not damaged during the curing process. The upper filler 125a may be formed of photocurable acrylic resin. In order to suppress unwanted penetration of moisture through the upper filler 125a, one or more getters may be mixed into the upper filler 125a.

Next, referring to FIG. 13F, the upper part of the upper substrate 105 may be scribed to expose the pad portion PA of the lower substrate 110.

A plurality of data pads connected to a plurality of data wires and a plurality of gate pads connected to a plurality of gate wires may be located in the exposed pad portion PA.

At this time, the upper PI substrate 102 or the upper filler 125a located on both sides of the upper part of the upper substrate 105 may not be removed during scribing, but the present invention is not limited to this.

Next, referring to FIG. 13g, the COF 135 can be attached to the exposed pad portion PA to mount the driver IC. However, the present invention is not limited to this.

The COF 135 generates an image signal transmitted to the data wiring of the lower substrate 110 through a signal voltage transmitted from the printed circuit board and a scanning signal transmitted to the gate wiring and includes an on/off signal of the thin film transistor. and output data driver IC and gate driver IC can be mounted.

At this time, the data driver IC and the gate driver IC may each include a semiconductor device packaged in a chip form.

Next, referring to FIG. 13h, the upper polarizer 101 can be attached to the surface of the upper substrate 105.

The upper polarizer 101 may be attached to cover the upper PI substrate 102 and the upper filler 125a, including the upper substrate 105.

As an example, the upper polarizer 101 may include a first support, a second support, and a first polarizing element located between the first support and the second support.

The first polarizing element may be made of polyvinyl alcohol (PVA).

The first support may be made of a protective film without retardation, and may be made of, for example, tri-acetyl cellulose (TAC).

In addition, the second support may be made of a protective film without phase retardation to protect the first polarizing element, for example, 0-RT (refers to modified TAC with Rth close to 0 nm, also called 0-TAC) ) or COP (Cyclo-Olefin-Polymer).

Next, referring to FIGS. 13i and 14f, a portion of the surface of the lower substrate 110 may be etched to expose the surface of the lower PI substrate 112.

At this time, Figure 14f shows an example where the entire surface of the lower PI substrate 112 is exposed, but the present invention is not limited to this. Also, unlike FIG. 14F, FIG. 13I shows an example where the display panel is flipped upside down so that the lower substrate 110 is placed on top.

Next, referring to FIGS. 13J and 14G, the lower substrate 110 where the lower PI substrate 112 is exposed is coated and filled with the lower filler 125b.

The lower filler 125b may have sufficient flexibility to be used in the bending area. The lower filler 125b may be a material that can be cured with low energy within a limited time so that the components under the lower filler 125b are not damaged during the curing process. The lower filler 125b may be formed of photocurable acrylic resin. In order to suppress unwanted penetration of moisture through the lower filler 125b, one or more getters may be mixed into the lower filler 125b.

Next, referring to FIG. 13K, the lower polarizer 111 can be attached to the surface of the lower substrate 110.

The upper polarizer 101 may be attached to cover the lower PI substrate 112 and the lower filler 125b, including the lower substrate 110.

As an example, the lower polarizer 111 may include a third support, a fourth support, and a second polarizing element located between the third and fourth supports.

The second polarizing element may be made of polyvinyl alcohol (PVA).

The third support may be made of a protective film without retardation, and may be made of, for example, tri-acetyl cellulose (TAC).

In addition, the fourth support may be made of a protective film without phase retardation to protect the second polarizing element, for example, 0-RT (refers to modified TAC with Rth close to 0 nm, also called 0-TAC) ) or COP (Cyclo-Olefin-Polymer).

Next, referring to FIG. 13L, the display panel can be completed by attaching the printed circuit board 136 to the COF 135.

Exemplary embodiments of the present invention may be described as follows.

A display device according to an embodiment of the present invention includes a display panel divided into a bending area in which at least one side is bent and a non-bending area in which a top surface is flat, wherein the display panel includes upper and lower substrates disposed in the display area. , It may be in contact with the side surfaces of the upper and lower substrates, respectively, and may be composed of upper and lower polyimide (PI) substrates disposed in a non-display area, and a thread pattern disposed in the non-display area between the upper and lower PI substrates. .

According to another feature of the present invention, the bending area may include the entire non-display area and a portion of the display area, and the non-bending area may include the display area.

According to another feature of the present invention, the display device may further include a liquid crystal layer interposed in the display area between the upper and lower substrates.

According to another feature of the present invention, the seal pattern includes a first seal pattern disposed at one end of the non-display area adjacent to the display area and a second seal pattern disposed at the other end of the non-display area. It can be composed of:

According to another feature of the present invention, the second seal pattern may be arranged to be spaced apart from the first seal pattern.

According to another feature of the present invention, the thread pattern may be composed of a single pattern from one end of the non-display area adjacent to the display area to the other end of the non-display area.

According to another feature of the present invention, the upper and lower substrates may be partially bent in the bending area.

According to another feature of the present invention, the upper PI substrate contacts an end of the upper substrate and may be located inside the display panel.

According to another feature of the present invention, it further includes a black matrix disposed between the upper PI substrate and the thread pattern, and the upper PI substrate may be in contact with the upper surface of the black matrix.

According to another feature of the present invention, the lower PI substrate contacts an end of the lower substrate and may be located inside the display panel.

According to another feature of the present invention, the lower PI substrate may contact the lower surface of the thread pattern.

According to another feature of the present invention, the display may further include a filler filled in the non-display area where the upper and lower PI substrates are not disposed.

According to another feature of the present invention, the display device may further include an upper polarizer attached to the outside of the upper substrate and a lower polarizer attached to the outside of the lower substrate.

According to another feature of the present invention, the filler may include an upper filler that fills the inner space between the upper PI substrate and the upper polarizer and a lower filler that fills the inner space between the lower PI substrate and the lower polarizer.

According to another feature of the present invention, the display device may further include a gate out wiring connecting a gate wiring in the display area and a gate in panel (GIP) portion in the non-display area.

According to another feature of the present invention, the width of the gate out wiring may increase in the area where the first seal pattern is located and the folding area.

According to another feature of the present invention, the GIP portion may be disposed outside the folding area.

According to another feature of the present invention, the gate out wiring may include a plurality of holes therein.

According to another feature of the present invention, in the bending area, the side of the display panel is bent vertically, and the upper and lower PI substrates may be disposed throughout the bending area.

According to another feature of the present invention, the filler is disposed in a portion of the non-display area, and may further include a dummy upper and lower substrate disposed in a remaining portion of the non-display area on which the filler is not disposed.

According to another feature of the present invention, the upper and lower substrates and the dummy upper and lower substrates may be made of glass.

According to another feature of the present invention, the upper PI substrate contacts an end of the upper substrate and an end of the dummy upper substrate and may be located inside the display panel.

According to another feature of the present invention, it further includes a black matrix disposed between the upper PI substrate and the thread pattern, and the upper PI substrate and the dummy upper substrate may be in contact with the upper surface of the black matrix.

According to another feature of the present invention, the lower PI substrate contacts an end of the lower substrate and an end of the dummy lower substrate and may be located inside the display panel.

According to another feature of the present invention, the lower PI substrate and the dummy lower substrate may contact the lower surface of the thread pattern.

Although embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and various modifications may be made without departing from the technical spirit of the present invention. . Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be construed as being included in the scope of rights of the present invention.

101, 201, 301, 401, 501: upper polarizer
102, 202, 302, 402, 502: upper PI board
105, 205, 305, 405, 505: upper substrate
110, 210, 310, 410, 510: lower substrate
111, 211, 311, 411, 511: lower polarizer
112, 212, 312, 412, 512: Lower PI substrate
125a, 225a, 325a, 425a, 525a: upper filler
125b, 225b, 325b, 425b, 525b: Bottom filler
180, 280, 380, 480, 580: Thread pattern
180a, 280a, 380a: first thread pattern
180b, 280b, 380b: Second yarn pattern
305', 505': dummy upper substrate
315', 515': dummy lower substrate
AA: display area
BA: bending area
DL: data wiring
FA: folding area
GL: Gate wiring
NA: Non-display area
NBA: Non-bending area

Claims (25)

It includes a display panel divided into a bending area with at least one side bent and a non-bending area with a flat upper surface,
The display panel is,
Upper and lower substrates disposed in the display area;
Upper and lower polyimide (PI) substrates contacting side surfaces of the upper and lower substrates, respectively, and disposed in a non-display area; and
A display device comprising a thread pattern disposed in the non-display area between the upper and lower PI substrates. According to claim 1,
The bending area includes the entire non-display area and a portion of the display area,
The non-bending area includes the display area. According to any one of claims 1 and 2,
The display device further includes a liquid crystal layer interposed in the display area between the upper and lower substrates. According to claim 2,
The seal pattern is comprised of a first seal pattern disposed at one end of the non-display area adjacent to the display area and a second seal pattern disposed at another end of the non-display area. According to claim 4,
The second seal pattern is arranged to be spaced apart from the first seal pattern. According to claim 2,
The thread pattern is configured as a single pattern from one end of the non-display area adjacent to the display area to the other end of the non-display area. According to claim 1,
The upper and lower substrates are partially bent in the bending area. According to any one of claims 1, 4 and 6,
The upper PI substrate is in contact with an end of the upper substrate and is located inside the display panel. According to claim 8,
The display device further includes a black matrix disposed between the upper PI substrate and the thread pattern, wherein the upper PI substrate is in contact with the upper surface of the black matrix. According to any one of claims 1, 4 and 6,
The lower PI substrate is in contact with an end of the lower substrate and is located inside the display panel. According to claim 10,
The lower PI substrate is in contact with the lower surface of the thread pattern. According to any one of claims 1, 4 and 6,
The display device further includes a filler filled in the non-display area where the upper and lower PI substrates are not disposed. According to claim 12,
The display device further includes an upper polarizer attached to the outside of the upper substrate and a lower polarizer attached to the outside of the lower substrate. According to claim 13,
The filler includes an upper filler that fills an inner space between the upper PI substrate and the upper polarizer and a lower filler that fills an inner space between the lower PI substrate and the lower polarizer. According to any one of claims 4 and 5,
The display device further includes a gate out wiring connecting a gate wiring in the display area and a gate in panel (GIP) portion in the non-display area. According to claim 15,
The gate out wiring has a width that increases in a region where the first seal pattern is located and a folding region. According to claim 16,
The display device wherein the GIP portion is disposed outside the folding area. According to claim 15,
The display device wherein the gate out wiring includes a plurality of holes therein. According to claim 1,
In the bending area, the side of the display panel is bent vertically,
The upper and lower PI substrates are disposed throughout the bending area. According to claim 12,
The filler is disposed in a portion of the non-display area,
The display device further includes dummy upper and lower substrates disposed in the remaining portion of the non-display area where the filler is not disposed. According to claim 20,
The display device, wherein the upper and lower substrates and the dummy upper and lower substrates are made of glass. According to claim 20,
The upper PI substrate is in contact with an end of the upper substrate and an end of the dummy upper substrate, and is located inside the display panel. According to claim 20,
The display device further includes a black matrix disposed between the upper PI substrate and the thread pattern, wherein the upper PI substrate and the dummy upper substrate are in contact with the upper surface of the black matrix. According to claim 20,
The lower PI substrate is in contact with an end of the lower substrate and an end of the dummy lower substrate, and is located inside the display panel. According to claim 20,
The lower PI substrate and the dummy lower substrate are in contact with a lower surface of the thread pattern.

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