KR20230075744A - Light emitting diode display apparatus - Google Patents

Abstract

A light emitting diode display apparatus is provided that includes: a panel for a display apparatus having a plurality of light emitting diode elements on an upper surface; and a functional film laminated on the light emission surface of the panel of a display apparatus. The functional film includes: a non-light blocking area formed to correspond to the plurality of light emitting diode elements; and a light blocking area of the remaining areas excluding the non-light blocking area that is patterned, wherein the light blocking area is formed by a light blocking layer formed on the functional film. Therefore, it is possible to provide a light emitting diode display apparatus with significantly excellent reflection color uniformity.

Description

Light emitting diode display {LIGHT EMITTING DIODE DISPLAY APPARATUS}

The present invention relates to a light emitting diode display.

Micro light emitting diode (LED) and nano light emitting diode methods are attracting attention as next-generation display devices in the future. The organic light emitting diode display should include an upper portion of a polarizing plate to prevent reflection to ensure antireflection properties. In the case of a micro light emitting diode, a plurality of micrometer-sized light emitting diode chips are used as a back light unit, which is accompanied by a lot of heat.

Since stability against heat cannot be secured in the polarizer, the antireflection property must be secured in a different way. Therefore, a low-reflection film is required on the upper part, and a technology of scattering light using particles has been introduced to scatter the reflection of the electrodes of the inner panel and the light emitting diode chip by external light. In the case of a micro light emitting diode TV, it is free to change from a small size to a large size by connecting modular modules to form an entire screen.

However, a light blocking layer (black matrix) needs to be formed between the micro light emitting diodes to cover TFTs and electrodes in the panel. However, when the light blocking layer is formed between the micro light emitting diodes, it is difficult to uniformly form the light blocking layer between the micro light emitting diodes because the size of the micro light emitting diode itself is small. This may not provide a uniform reflective color and may deteriorate the appearance of the display device. In addition, since the portions exposed to external light are not uniform, each has a different reflective color, which causes a problem in that the colors of all connected modules appear differently.

The background art of the present invention is disclosed in Korean Patent Publication No. 10-2013-0103595 and the like.

An object of the present invention is to provide a light emitting diode display device having remarkably excellent uniformity of reflective color.

Another object of the present invention is to provide a light emitting diode display that does not cause shrinkage of a panel due to heat generated when forming a light blocking layer.

One aspect of the present invention is a light emitting diode display.

1. A light emitting diode display includes a display panel having a plurality of light emitting diode elements on an upper surface; and a functional film stacked on a light exit surface of the display panel, wherein the functional film includes a non-light blocking area formed to correspond to the plurality of light emitting diode elements; and a light-blocking area, which is a remaining area except for the non-light-shielding area, and the light-blocking area is formed by a light-blocking layer formed on the functional film.

In 2.1, an area ratio of the light-blocking area to the entirety of the non-light-shielding area and the light-shielding area may be 60% or more.

In 3.1-2, the light blocking pattern may be formed outside or inside the functional film.

In 4.1-3, the functional film is a base film; A functional coating layer formed on an upper surface of the base film may be included, and the light blocking pattern may be formed on a part of the upper surface of the base film.

In 5.4, the light blocking pattern may be formed inside the functional coating layer.

In 6.1-5, the functional film is a base film; a functional coating layer formed on an upper surface of the base film; and the light blocking pattern formed on a part of a lower surface of the base film.

In 7.4 or 6, the functional coating layer may include one or more of a hard coating layer, a scattering layer, a low reflection layer, an ultra low reflection layer, a primer layer, an anti-fingerprint layer, an anti-reflection layer, and an antiglare layer.

In 8.1-7, the functional film may have a reflectance of 5% or less.

In 9.1-8, the light emitting diode device may be a micro light emitting diode.

In 10.1-9, the plurality of light emitting diode elements may include a plurality of light emitting diode assemblies composed of red light emitting diodes, green light emitting diodes, and blue light emitting diodes.

In 11.10, the light blocking pattern may be formed between the light emitting diode assemblies.

The present invention provides a light emitting diode display having remarkably excellent uniformity of reflective color.

The present invention provides a light emitting diode display that does not cause shrinkage of a panel due to heat generated when forming a light blocking layer.

1 is a conceptual diagram of a plan view of a light emitting diode display according to the present invention.
FIG. 2 is a schematic cross-sectional view of a part of the light emitting diode display as a cross-sectional view along line XY of FIG. 1 .
3 is a conceptual diagram of a panel for a display device according to an embodiment of the present invention.
4 is a schematic cross-sectional view of a portion of the light emitting diode display of the present invention.
5 is a schematic cross-sectional view of a portion of the light emitting diode display of Comparative Example 1.

With reference to the accompanying drawings, the present invention will be described in detail by way of examples so that those skilled in the art can easily practice the present invention. This invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

In order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and the same names are used for the same or similar components throughout the specification. The length and size of each component in the drawings are for explaining the present invention, and the present invention is not limited to the length and size of each component described in the drawings.

In the present specification, "(meth)acryl" may mean acryl and/or methacrylic.

When expressing a numerical range in this specification, “X to Y” means “X or more and Y or less (X≤ and ≤Y)”.

The inventor of the present invention provides a light emitting diode display device that does not affect the light emitting efficiency of the light emitting diode device, has remarkably excellent uniformity of reflective color, and does not cause shrinkage of the panel due to heat generated during formation of the light blocking layer. did

A light emitting diode display device of the present invention includes a panel for a display device having a plurality of light emitting diode elements on an upper surface; and a functional film stacked on a light exit surface of the display panel, wherein the functional film includes a non-light blocking area formed to correspond to the plurality of light emitting diode elements; and a light-blocking area, which is a remaining area except for the non-light-shielding area, and the light-blocking area is formed by a light-blocking layer formed on the functional film.

Hereinafter, the light emitting diode display of the present invention will be described with reference to FIGS. 1, 2 and 3. 1 is a conceptual diagram of a plan view of a light emitting diode display according to an exemplary embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a portion of the light emitting diode display taken along the line X-Y of FIG. 1 . 3 is a conceptual diagram of a panel for a display device according to an embodiment of the present invention.

The light emitting diode display device includes a display device panel 100 , a light emitting diode device assembly 110 and a functional film 200 .

The functional film 200 is composed of a non-light blocking area 240 and a light blocking area 230 . The light blocking area 230 is a remaining area of the functional film 200 except for the non-light blocking area 240 , and the functional film 200 is patterned into the non light blocking area 240 and the light blocking area 230 . A plurality of non-light-shielding regions 240 are formed to correspond to positions where the light emitting diode device assembly 110 is formed, and the non-light-shielding regions 240 are spaced apart from each other. Since the light-blocking region 230 is composed of only one functional film 200 except for the non-light-shielding region 240, it is integrally formed.

The non-light blocking area 240 is formed to correspond to the light emitting diode element assembly 110 of the panel 100 for a display device. Through this, the emission of light emitted from the light emitting diode device assembly 110 may not be affected. The "formed to correspond" means that the non-light blocking region 240 is formed directly above each light emitting diode element or an assembly of light emitting diode elements within a range of 100% to 1000% of the area of each light emitting diode element or the assembly of light emitting diode elements means

The non-light-shielding region 240 is formed of the remaining region except for the light-shielding region when a light-shielding region described below is formed in the functional film.

The light-blocking region 230 is formed by a light-blocking layer formed on the functional film 200 , and the light-blocking layer is formed by the light-blocking pattern 231 . In the present invention, a light blocking pattern is not formed between the light emitting diode device assembly 110 in contact with the display panel 100, but instead a light blocking pattern on at least one surface of the functional film laminated on the light exit surface of the display device panel ( 231) was formed. Through this, the problem that the light blocking pattern is not uniformly formed when forming the light blocking pattern between the conventional light emitting elements is fundamentally eliminated, so that the uniformity of the reflected color is remarkably improved, and the light blocking layer is composed of the light emitting diode element assembly 110 and Since it is not formed on the same plane, but is formed on the top of the light emitting diode device assembly 110 in a non-contact state, there is no problem of shrinkage of the panel due to heat generated during formation of the light blocking layer.

In one embodiment, the light blocking pattern may be formed between light emitting diode assemblies including red light emitting diodes 111 , green light emitting diodes 112 , and blue light emitting diodes 113 .

The area ratio of the light-blocking region 230 to the entirety of the non-light-shielding region 240 and the light-shielding region 230 is the size of the panel 100 for a display device, the size of the plurality of light emitting elements 110 formed on the panel for a display device, and / or may vary depending on the number. Preferably, the area ratio may be 60% or more, for example, 60% to 95%.

The light blocking pattern 231 may be formed on an upper or lower surface of the exterior of the functional film 200 or inside the functional film 200 . 2 shows a case where the light blocking pattern 231 is formed inside the functional film 200 . FIG. 4 shows a case where the light blocking pattern 231 is formed on the lower surface of the exterior of the functional film 200 .

The functional film 200 includes a base film 210 and a functional coating layer 220 formed on an upper surface of the base film 210, and a light blocking pattern 231 is in contact with a part of the upper surface of the base film 210. is formed by An area where the light blocking pattern 231 is not formed becomes a non-light blocking area 240 .

The light-blocking pattern 231 may be black or a colored pattern. The colored color may have a color value within a certain range to provide a light blocking effect. For example, the color value may be equal to or less than +10 for each of the a* value and the b* value in the L*a*b* color space, and within the above range, the effect of the present invention may be easily realized.

The light-blocking pattern 231 may be formed of a composition containing at least one of inorganic, organic, or organic-inorganic dyes and pigments that provide black or color. The dyes and pigments may include carbon black, but are not limited thereto. One or more of dyes and pigments may be included in an amount of 10 wt% to 50 wt%, preferably 10 wt% to 35 wt%, in the light-shielding pattern. Within the above range, a light blocking effect may be provided and a uniform color value may be obtained in a reflective color.

The composition may be a heat-curable or photo-curable composition, but the photo-curable composition uses an organic solvent that is easily volatilized compared to the heat-curable composition, so that bubbles or wrinkles do not occur during volatilization and a uniform light-shielding pattern surface can be formed. .

The composition may include at least one of dyes and pigments; at least one of a curable resin and a curable monomer; and an initiator. The curable resin may include one or more conventional types known to those skilled in the art, such as (meth)acrylate-based, epoxy-based, urethane-based, urethane (meth)acrylate-based, and silicone-based resins. The curable monomer may include one or more conventional types known to those skilled in the art, such as (meth)acrylate-based, epoxy-based, urethane-based, urethane (meth)acrylate-based, and silicone-based monomers. The initiator may include at least one of a photoinitiator and a thermal initiator. The photoinitiator and thermal initiator may include one or more types known to those skilled in the art.

The composition may further include a solvent so that the composition is uniformly applied so that a light blocking pattern having a smooth surface may be formed. An appropriate type of solvent may be selected and used as long as it does not dissolve at least one of dyes and pigments and does not damage the base film.

The light blocking pattern 231 may be smaller than or equal to the thickness of the functional coating layer 220 . In one embodiment, the thickness of the light blocking pattern 231 may be 20% to 100%, preferably 30% to 80% of the thickness of the functional coating layer 220 . Within this range, it is possible to achieve the effect of a functional coating layer while producing a light blocking effect.

The light blocking pattern 231 may have a thickness of 10 μm or less, for example, greater than 0 μm and less than or equal to 5 μm. Within the above range, it may be easy to produce a light blocking effect, and it may be easy to form a functional coating layer.

The functional coating layer 220 may have a total light transmittance of 80% or more, for example, 90% to 100, and a haze of 1% or less, for example, 0% to 0.5%. Light emitted from the light emitting device may not be affected.

The functional coating layer 220 may include at least one of a hard coating layer, a scattering layer, a low reflection layer, an ultra low reflection layer, a primer layer, an anti-fingerprint layer, an anti-reflection layer, and an antiglare layer. Preferably, the functional coating layer may include an antireflection layer, and in this case, the functional film may have a reflectance of 5% or less, for example, 0.1% to 3%, for example, 2% or less. Within the above range, the reflective color of the light emitting display device may be improved. The 'reflectance' may be measured by a conventional method known to those skilled in the art.

The base film 210 may have a total light transmittance of 90% or more, for example, 92% to 100%. Within this range, light emitted from the light emitting device may not be affected.

The base film 210 is formed of an optically transparent resin, for example, a cellulose ester-based resin including triacetyl cellulose (TAC), a cyclic polyolefin-based resin including amorphous cyclic polyolefin (COP), and the like, Polycarbonate-based resins, polyester-based resins including polyethylene terephthalate (PET), polyethersulfone-based resins, polysulfone-based resins, polyamide-based resins, polyimide-based resins, acyclic-polyolefin-based resins, polymethyl It may include at least one of polyacrylate-based resins including methacrylate resins, polyvinyl alcohol-based resins, polyvinyl chloride-based resins, and polyvinylidene chloride-based resins, but is not limited thereto.

The panel 100 for a display device may provide a light emitting effect by forming a plurality of light emitting diode device assemblies 110 on an upper surface thereof.

The light emitting diode element assembly 110 is composed of a red light emitting diode 111 , a green light emitting diode 112 and a blue light emitting diode 113 . The light emitting diode element assembly 110 may be a micro light emitting diode or a nano light emitting diode, and the red light emitting diode 111, the green light emitting diode 112, and the blue light emitting diode 113 may be a micro light emitting diode or a nano light emitting diode, respectively. there is.

A plurality of light emitting diode device assemblies 110 may be spaced apart from each other on the upper surface of the panel 100 for a display device.

Although not shown in FIG. 2 , the panel 100 for a display device may include various optical elements for driving and/or controlling functions of the light emitting display device. For example, the panel 100 for a display device may include a substrate, a transistor (TFT), and various electrodes, but is not limited thereto.

3 is an example of the panel 100 for a display device according to the present invention, and the present invention is not limited thereto.

In the display device panel 100 , a buffer layer 11 may be provided on a substrate 1 , and a transistor (TFT) and light emitting diodes 111 , 112 , and 113 may be provided on the buffer layer 11 .

The substrate 1 may be made of glass or plastic. The buffer layer 11 blocks impurity elements from permeating through the substrate and performs a function of planarizing the surface, and may be formed of a single layer or a multi-layer of an inorganic material such as silicon nitride or silicon oxide.

The transistor includes an active layer 21, a gate electrode 22, a source electrode 23a, and a drain electrode 23b. The active layer 21 may include a semiconductor material, and has a source region, a drain region, and a channel region between the source and drain regions. The gate electrode 22 is formed on the active layer 21 to correspond to the channel region. The source electrode 23a and the drain electrode 23b are electrically connected to the source and drain regions of the active layer 21, respectively. A first insulating layer 13 made of an inorganic insulating material is disposed as a gate insulating film between the active layer 21 and the gate electrode 22 . A second insulating layer 15 is disposed as an interlayer insulating film between the gate electrode 22 and the source electrode 23a/drain electrode 23b. A third insulating layer 17 is disposed on the source electrode 23a/drain electrode 23b as a planarization film. The second insulating layer 15 and the third insulating layer 17 may be formed of an organic insulating material or an inorganic insulating material, or may be formed by alternating an organic insulating material and an inorganic insulating material.

A bank layer 40 defining a pixel area may be disposed on the third insulating layer 17 . The bank layer 40 includes a first bank 41 and a second bank 42 formed over the first bank 41 . The height of the first bank 41 may be determined by the height and viewing angle of the light emitting diode.

The passivation layer 52 surrounds the light emitting diodes 111 , 112 , and 113 in the concave portion 43 . The passivation layer 52 covers the concave portion 43 and the first electrode 51 by filling the space between the bank layer 40 and the light emitting diodes 111 , 112 , and 113 . A second electrode 53 electrically connected to the exposed second contact electrodes of the light emitting diodes 111 , 112 , and 113 and the conductive layer 55 is formed on the passivation layer 52 .

An intermediate layer 120 may be formed between the display device panel 100 and the functional film 200 .

The intermediate layer 120 may or may not contact the plurality of light emitting devices 110 . The intermediate layer 120 may increase reliability of the display device by protecting the plurality of light emitting devices 110 or fixing the display device panel 100 and the functional film 200 to each other.

The intermediate layer 120 may be an adhesive layer or a non-adhesive layer. For example, the intermediate layer 120 may be formed of an epoxy-based molding composition, an optical clear adhesive (OCA) composition, a pressure sensitive adhesive (PSA) composition, or the like.

Hereinafter, a light emitting diode display according to another embodiment of the present invention will be described with reference to FIG. 4 .

The LED display device includes a display device panel 100, a plurality of LED elements 110, and a functional film 200'.

The functional film 200' includes a base film 210 and a functional coating layer 220' formed on an upper surface of the base film 210, and a light blocking pattern ( 231) is formed. An area where the light blocking pattern 231 is not formed becomes a non-light blocking area 240 , and an area where the light blocking pattern 231 is formed, that is, an area other than the non light blocking area 240 becomes a light blocking area. The light blocking pattern 231 is substantially the same as the light emitting diode display of FIGS. 1 and 2 except for the fact that the light blocking pattern 231 is not formed inside the functional film but is formed on a part of the lower surface of the outside of the base film 210 .

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and cannot be construed as limiting the present invention by this in any sense.

Example 1

30 parts by weight of polyfunctional acrylate-based monomer PETIA (Entis, Inc., pentaerythritol triacrylate), 5 parts by weight of carbon black (BK-6743, TOKUSHIKI, Inc.), 4 parts by weight of phosphorus-based initiator TPO (BASF, Inc.) as a photoinitiator , A composition for forming a light-shielding pattern was prepared by mixing 31 parts by weight of methyl ethyl ketone and 30 parts by weight of propylene glycol methyl ether as a solvent.

An application layer was formed by applying the prepared composition to a predetermined thickness on the entire upper surface of a base film (polyethylene terephthalate film). A mask formed of a metal material and capable of forming a pattern was placed on top of the coating layer and UV was irradiated. Areas irradiated with UV are cured, while areas not irradiated with UV are uncured. The uncured region was removed by wiping with ethanol to prepare a base film having a light-shielding pattern formed on the upper surface of FIG. 2 . An antireflection layer was formed on the light blocking pattern to form the functional film of FIG. 2 .

A display device panel having micro light emitting diodes stacked on an upper surface thereof was prepared, and the prepared functional film of FIG. 2 was adhered to the upper surface of the display device panel using OCA to manufacture a display device module.

Example 2

25 parts by weight of polyfunctional acrylate-based monomer PETIA (Entis, Inc., pentaerythritol triacrylate), 10 parts by weight of carbon black (BK-6743, TOKUSHIKI, Inc.), 4 parts by weight of phosphorus-based initiator TPO (BASF, Inc.) as a photoinitiator , A composition for forming a light-shielding pattern was prepared by mixing 31 parts by weight of methyl ethyl ketone and 30 parts by weight of propylene glycol methyl ether as a solvent.

A base film having a light-shielding pattern was prepared in the same manner as in Example 1. An antireflection layer was formed on the light blocking pattern to form the functional film of FIG. 2 . A module for a display device was manufactured in the same manner as in Example 1.

Example 3

30 parts by weight of polyfunctional acrylate-based monomer PETIA (Entis, Inc., pentaerythritol triacrylate), 15 parts by weight of carbon black (BK-6743, TOKUSHIKI, Inc.), 4 parts by weight of phosphorus-based initiator TPO (BASF, Inc.) as a photoinitiator , A composition for forming a light-shielding pattern was prepared by mixing 25 parts by weight of methyl ethyl ketone and 28 parts by weight of propylene glycol methyl ether as a solvent.

A base film having a light-shielding pattern was prepared in the same manner as in Example 1. An antireflection layer was formed on the light blocking pattern to form the functional film of FIG. 2 . A module for a display device was manufactured in the same manner as in Example 1.

Example 4

A composition for forming a light-shielding pattern was prepared in the same manner as in Example 1.

An application layer was formed by applying the prepared composition to a predetermined thickness on the entire lower surface of the base film (polyethylene terephthalate film). A mask formed of a metal material and capable of forming a pattern was placed under the coating layer and UV was irradiated. Areas irradiated with UV are cured, while areas not irradiated with UV are uncured. The uncured region was removed by wiping with ethanol to prepare a base film having a light blocking pattern formed on the lower surface of FIG. 1 . An antireflection layer was formed on the upper surface of the base film to form the functional film of FIG. 4 . A module for a display device was manufactured in the same manner as in Example 1.

Comparative Example 1

The same composition as in Example 1, but except for the solvent. The composition was applied between the diode angles on the panel. An antireflection layer was formed on the upper surface of the base film in the same manner as in Example 1 to manufacture a display device module as shown in FIG. 5 .

5 is a schematic cross-sectional view of a display device module manufactured in Comparative Example 1; Referring to FIG. 5 , a light blocking pattern ( 231), an intermediate layer 120 (PSA), a base film 210, and an antireflection layer 220 sequentially formed on the light blocking pattern 231 are formed.

When the method shown in FIG. 5 is applied, light-blocking materials must be finely applied in order to block light in all regions where no diodes are located. In both the heat curing method and the photocuring method, it is difficult to block light in a uniform area due to the constant flow of the coating liquid. In addition, heat generated during the curing process causes shrinkage in the substrate and module.

Reflection color values L*, a*, and b* were measured by irradiating light from the outside with the display device modules of Examples and Comparative Examples. For the measurement method, a CM3600A (Konica Minolta) colorimeter was used, and for measurement conditions, a D65 light source was used, 2-degree reflection conditions, and L*, a*, and b* of SCI and SCE were measured for reflection color values. Nine points were measured on a module of 10 to 13 inches. The measured 9 points are each corner when the entire area is equally divided into 4 equal parts. Measurements were made 9 times each per module and then the deviation was calculated.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 SCI L* 0.14 0.11 0.10 0.11 0.41 a* 0.11 0.09 0.09 0.1 0.44 b* 0.15 0.14 0.15 0.17 0.51 SCE L* 0.44 0.33 0.21 0.38 0.71 a* 0.14 0.11 0.10 0.12 0.35 b* 0.13 0.11 0.09 0.11 0.27

As shown in Table 1, it can be confirmed that the light emitting diode display according to the present invention exhibits remarkably excellent uniformity of reflective color due to low deviation of each of L*, a*, and b*.

On the other hand, it can be confirmed that the modules of Comparative Example, which do not satisfy the configuration of the present invention, have significantly low uniformity of reflective color due to high deviation of each of L*, a*, and b*.

Simple modifications or changes of the present invention can be easily performed by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (11)

a panel for a display device having a plurality of light emitting diode elements on an upper surface thereof; and a functional film laminated on a light exit surface of the display panel,
The functional film may include a non-light blocking area formed to correspond to the plurality of light emitting diode elements; And it is patterned as a light-shielding area of the remaining area except for the non-light-shielding area,
Wherein the light blocking area is formed by a light blocking pattern formed on the functional film, the light emitting diode display device.
The light emitting diode display device according to claim 1 , wherein an area ratio of the light-blocking region to the entirety of the non-light-shielding region and the light-shielding region is 60% or more.
The light emitting diode display device according to claim 1, wherein the light blocking pattern is formed outside or inside the functional film.
According to claim 1, wherein the functional film is a base film; A light emitting diode display comprising a functional coating layer formed on an upper surface of the base film, wherein the light blocking pattern is formed on a portion of the upper surface of the base film.
The light emitting diode display device according to claim 4, wherein the light blocking pattern is formed inside the functional coating layer.
According to claim 1, wherein the functional film is a base film; a functional coating layer formed on an upper surface of the base film; and the light blocking pattern formed on a portion of a lower surface of the base film.
The light emitting according to claim 4 or 6, wherein the functional coating layer includes at least one of a hard coating layer, a scattering layer, a low reflection layer, an ultra low reflection layer, a primer layer, an anti-fingerprint layer, an anti-reflection layer, and an antiglare layer. diode display.
The light emitting diode display device according to claim 1, wherein the functional film has a reflectance of 5% or less.
The light emitting diode display device according to claim 1, wherein the light emitting diode element is a micro light emitting diode.
The light emitting diode display device according to claim 1, wherein the plurality of light emitting diode elements includes a plurality of light emitting diode assemblies including red light emitting diodes, green light emitting diodes, and blue light emitting diodes.
The light emitting diode display device according to claim 10, wherein the light blocking pattern is formed between the light emitting diode assemblies.

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