KR102162880B1 - TRANSPARENT DIGITAL SIGNAGE AND PRINTED CIRCUIT BOARD WITH DECREASED Linear Resistance FOR THE SAME - Google Patents

Abstract

The present invention relates to a transparent digital signage display for reducing a line resistance of a driving line by configuring an LED driving line formed on a transparent circuit board into three or more layers including a baseline layer, an electrode line layer, and an oxidation protection film layer; and a printed circuit board having a reduced line resistance therefor. Moreover, the present invention relates to the transparent digital signage display which reduces the length of a control wiring from an input terminal to the end in half by each controlling LEDs that make up the screen pixels of the digital signage at both ends of a screen; and the printed circuit board having the reduced line resistance therefor.

Description

Transparent digital signage display and printed circuit board with reduced line resistance therefor {TRANSPARENT DIGITAL SIGNAGE AND PRINTED CIRCUIT BOARD WITH DECREASED Linear Resistance FOR THE SAME}

The present invention is a transparent digital signage display for reducing the line resistance of the driving line by configuring an LED driving line formed on a transparent circuit board with three or more layers including a base line layer, an electrode line layer, and an antioxidant layer, and line resistance therefor. This relates to a reduced printed circuit board.

Further, the present invention is a transparent digital signage display that reduces the control wiring length from the input terminal to the end by half by controlling the LEDs constituting the screen pixels of the digital signage at both ends of the screen, and the line resistance therefor is reduced. It relates to a printed circuit board.

In general, digital signage refers to a display device providing one-way and two-way services that provides various information including video advertisements to the public in real time.

In addition, in recent years, a transparent display using LED as a pixel is applied to digital signage to deliver various contents including news, weather information, sports, public service advertisements, facility information, etc. installed indoors or outdoors.

Transparent LED digital signage aims to provide a high-resolution, transparent digital display by being installed in places with large population movements such as airports, bus terminals, stadiums, hotels, shopping malls, museums, and hospitals.

As shown in FIG. 1, in the transparent digital signage, a printed circuit board on which LEDs constituting pixels are mounted is stacked on a transparent base panel, and a transparent window cover is stacked thereon to configure a transparent display.

To this end, the printed circuit board consists of a circuit pattern on a transparent film such as PET (Polyethylene Terephthalate), and an RGB LED chip is mounted thereon, and in some cases, a flexible PCB. In addition, polycarbonate, acrylic, and chemically tempered glass are used as transparent panel materials.

However, in the case of a digital signage transparent display, when a circuit pattern is formed on a transparent PET film printed circuit board and a rated voltage and current are applied by mounting an LED, linear resistance increases according to the length of the circuit pattern.

Therefore, there is a problem in that there is a difference in power supplied to the starting point and the ending point of the circuit pattern, and the LED chips constituting the pixel emit light with uneven luminance due to the difference in supply power, resulting in incomplete color expression and distorted color expression. .

If a number of LEDs are arranged in a string structure in one row and a plurality of LED strings are arranged in parallel to form the pixels of the screen with LEDs, the light emission characteristics of the LEDs arranged according to the length of the circuit pattern are different due to line resistance Screen characteristics deteriorate.

For example, a large-screen transparent digital signage constructs pixels by arranging a plurality of single circuit patterns in parallel to display high-resolution digital information or content as an image, and a 5.0V voltage is applied as an operating power source.

Therefore, since the length of the circuit pattern gradually increases as the distance from the power supply start point increases, the 5.0V voltage supplied to the operating power of the LED gradually decreases as the length increases due to the liners resistance generated in the circuit pattern.

Moreover, in order to secure transparency, digital signage displays have to narrow the width of the circuit pattern on which the LED is mounted. As the circuit pattern becomes thinner, the line resistance increases according to the length of the circuit.

The increased line resistance generates a voltage and current difference between the starting point and the ending point of the circuit pattern, causing the LED to emit light with uneven brightness and brightness, resulting in incomplete color expression and distorted color expression. This phenomenon gets worse as the screen gets bigger.

Republic of Korea Patent Publication No. 10-2019-0082683 Korean Patent Registration No. 10-1947113

The present invention is to solve the above-described problem, by configuring an LED driving line formed on a transparent circuit board with three or more layers including a base line layer, an electrode line layer, and an oxidation preventing layer layer, thereby reducing the line resistance of the driving line. It is intended to provide a digital signage display and a printed circuit board with reduced line resistance therefor.

Further, the present invention is a transparent digital signage display that reduces the control wiring length from the input terminal to the end by half by controlling the LEDs constituting the screen pixels of the digital signage at both ends of the screen, and the line resistance therefor is reduced. To provide a printed circuit board.

To this end, the printed circuit board with reduced line resistance for transparent digital signage according to the present invention comprises: a transparent circuit board; A driving line stacked on the transparent circuit board and a plurality of driving lines spaced apart from each other; A plurality of LEDs mounted on the driving line at regular intervals to form pixels of a screen; And an input terminal provided at an end of the driving line, wherein the driving line comprises: a first circuit pattern made of a conductive material formed on the transparent circuit board; A second circuit pattern made of a conductive material formed on the first circuit pattern; And a third circuit pattern made of a conductive material formed on the second circuit pattern, thereby reducing a line resistance of the driving line by increasing a cross-sectional area of the driving line.

In this case, it is preferable that the first circuit pattern is a base line made of a copper material, the second circuit pattern is an electrode line made of a copper material, and the third circuit pattern is an oxidation prevention film made of a tin material.

In addition, it is preferable that the first circuit pattern is a base line printed with a thin metal plate, the second circuit pattern is an electrode line electroplated with a metal layer, and the third circuit pattern is an oxidation prevention film electroplated with a metal layer.

In addition, it is preferable that the driving line on which the first to third circuit patterns are stacked has a higher height from one side of the transparent circuit board compared to a single-layer driving line having the same width and thus has a smaller resistance value. Do.

In addition, the driving lines each include a first driving line and a second driving line separated from each other, and the input terminal is a first input terminal connected to an outer end of the first driving line and an outer end of the second driving line It is preferable to configure the screen by flashing the LED by receiving signals from both sides of the driving line, including a second input terminal connected to.

In addition, it is preferable that the driving line is formed in a linear pattern, a plurality of driving lines of the linear pattern are arranged in parallel, and the LEDs are arranged in series for each driving line.

In addition, the driving line includes a power line for supplying power to the LED and a data line for controlling blinking of the LED, wherein the power line includes a first power line and a second drive provided in the first driving line. A second power line provided in a line, the data line including a first data line provided in the first driving line and a second data line provided in the second driving line, the power line and data It is desirable to control the line in both directions.

In addition, it is preferable that the number of LEDs 13 installed on the first power line and the first data line and the number of LEDs installed on the second power line and the second data line are the same.

On the other hand, the transparent digital signage display according to the present invention includes the printed circuit board as described above; A transparent base panel laminated on the bottom of the printed circuit board; And a transparent window cover laminated on the upper surface of the printed circuit board.

In the present invention as described above, the LED driving line formed on the transparent circuit board is configured in a multilayer structure including a base line, an electrode line, and an oxidation prevention film. Therefore, it is possible to reduce the line resistance compared to the circuit pattern of the same width by increasing the cross-sectional area.

Accordingly, by minimizing an increase in line resistance according to the length of the circuit pattern in transparent digital signage, it is possible to prevent the LED from emitting unevenly between the start point and the end point of the circuit pattern, and prevent the color expression characteristics of the screen from deteriorating.

In addition, it is possible to further reduce the line resistance by halving the length of the control wiring from the input terminal to the end and line resistance by supplying power and controlling the LEDs constituting the screen pixels of the digital signage from both ends of the screen. .

1 is a block diagram showing a transparent digital signage according to the prior art.
2 is an exploded view showing a transparent digital signage display according to the present invention.
3 is an assembled state diagram showing a transparent digital signage display according to the present invention.
4 is a view showing a driving line of a bidirectional driving printed circuit board according to the present invention.
5 is a flowchart for manufacturing a printed circuit board with reduced line resistance according to the present invention.
6 is an embodiment showing a bidirectional driving printed circuit board according to the present invention.
7A is an embodiment showing a driving line of a bidirectional driving printed circuit board according to the present invention.
7B is a partially enlarged view of FIG. 7A.

Hereinafter, a transparent digital signage display and a printed circuit board therefor according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 and 3, the transparent digital signage display according to the present invention has a printed circuit board 10 interposed therebetween, a base panel 20 is stacked on one side (for example, a bottom surface), and the other side of the opposite side A window cover 30 is stacked on (for example, the upper surface).

As an embodiment, the printed circuit board 10 is made of transparent polycarbonate (PC), the base panel 20 is made of transparent acrylic, and the window cover 30 is made of tempered glass.

Accordingly, the digital signage is composed of a transparent display, and the transparent base panel 20, the printed circuit board 10, and the transparent window cover 30 are stacked in the order from one side, or a structure stacked in the opposite order. Will have.

In addition, the frame has a finishing frame 40. For example, the finishing frame 40 serves as a spacer along with a rectangular frame surrounding the outer surface of the transparent base panel 20 or the transparent window cover 30, and the printed circuit board 10 is inserted into the gap therebetween. .

In the present invention of this configuration, a transparent base panel 20 and a transparent window cover 30 made of a transparent material are disposed in the front and rear directions, respectively, and a screen is provided by the printed circuit board 10 therebetween.

As described in detail below, the printed circuit board 10 has an LED string structure in which a plurality of LEDs (Light Emitting Diodes) 13 are arranged in series along a driving line, and a plurality of LED strings are parallel to each other. Arranged in a way.

In a structure of a plurality of LED strings spaced apart in parallel, when a plurality of LEDs 13 are mounted for each LED string structure, the LEDs 13 are arranged in grid-shaped pixels to realize a display screen of digital signage. .

On the other hand, the printed circuit board 10 of the present invention as briefly described above is a printed circuit board 10 with reduced line resistance, and constitutes a transparent digital signage together with a transparent base panel 20 and a transparent window cover 30 It is a component.

To this end, the printed circuit board 10 with reduced line resistance according to a preferred embodiment of the present invention includes a transparent circuit board 11, a driving line 12, an LED 13 and an input terminal 14.

At this time, the driving line 12 is formed on the transparent circuit board 11 and the LED 13 is mounted on the driving line 12. The input terminal 14 is electrically connected to the end of the drive line 12.

In particular, as described in more detail with reference to FIG. 4 below, the driving line 12 includes a first circuit pattern 12-1 made of a conductive material, and made of a conductive material formed on the first circuit pattern 12-1. It includes a second circuit pattern 12-2 and a third circuit pattern 13-3 made of a conductive material formed on the second circuit pattern 12-2.

Accordingly, as the cross-sectional area of the line increases due to an increase in the height of the drive line 12, the linear resistance of the drive line 12 decreases, thereby causing the LED to emit light unevenly between the start point and the end point of the circuit pattern. And the color expression characteristics of the screen are prevented from deteriorating.

In addition, as described later, the drive line 12 includes a first drive line 12L and a second drive line 12R separated from each other, and the input terminal 14 is connected to the outer end of the first drive line 12L. And a second input terminal 14R connected to an outer end of the first input terminal 14L and the second drive line 12R.

Accordingly, signals (power and control signals) are received from both sides of the driving line 12 through the input terminals 14, respectively, and the LED 13 is flashed to form a screen, through which digital signage of a two-way driving method Configure.

That is, a signal is transmitted from one side through the first input terminal 14L and the first driving line 12L, and at the same time, the signal is transmitted from the other side through the second input terminal 14R and the second driving line 12R. , Control in both directions at the same time at both ends.

More specifically, the transparent circuit board 11 is made of a transparent material to implement a transparent display. Transparent glass or a polyethylene terephthalate (PET) film may be used as the transparent material, and when the transparent circuit board 11 is implemented as an FPCB, the PET film is applied.

The driving lines 12 are formed in plural and are stacked on the above-described transparent circuit board 11. In addition, a plurality of driving lines 12 are disposed to be spaced apart from each other, and a plurality of LEDs 13 are mounted in a string structure on each of the driving lines 12.

The LEDs 13 are mounted on the driving line 12 at regular intervals. The mounting of the LED 13 is usually bonded on a pad formed on the driving line 12 in a SMT (Surface Mounting Technology) method, and a plurality of LEDs are mounted for each driving line 12. The LED 13 is applied with an RGB LED chip to constitute a color pixel.

In an embodiment, the driving lines 12 are formed in a straight pattern, and a plurality of driving lines 12 of the linear pattern are disposed in parallel. The LEDs 13 are arranged in series for each driving line 12 to compose a screen.

The input terminal 14 is provided at the end of the drive line 12, and power (rated voltage, rated current) and data signals are input through the input terminal 14 connected to the drive line 12. The data line may include a main data line (see “DL1” in FIG. 7B) and an auxiliary data line (see “DL2” in FIG. 7B).

On the other hand, in the above configuration, the present invention reduces the line resistance through a method of increasing the cross-sectional area of the drive line 12. This is because the line resistance is proportional to the length L and inversely proportional to the cross-sectional area A.

Accordingly, as shown in FIG. 4, the driving line 12 includes a first circuit pattern 12-1 made of a conductive material formed on the transparent circuit board 11 and a first circuit pattern 12-1 made of a conductive material formed on the first circuit pattern 12-1. It includes a second circuit pattern 12-2 and a third circuit pattern 13-3 made of a conductive material formed on the second circuit pattern 12-2.

As described above, as the drive line 12 of the present invention has a three-layer structure, the cross-sectional area of the drive line 12, which is a resistor, increases, and it is possible to reduce the increase in line resistance that increases from the start point to the end of the drive line 12. There will be.

Specifically, the driving line on which the first to third circuit patterns 12-1 to 12-3 are stacked has a height from one surface of the transparent circuit board 11 compared to a single-layer driving line having the same width. It is configured to be higher and the resistance value is smaller.

For example, the reduction in line resistance is based on the condition that the height of the three-layer structure is higher than that of the conventional single-layer structure in a state where the width is the same as that of a conventional driving line (not shown). Therefore, if the height of the third layer is three times that of the first layer, the line resistance decreases three times.

At this time, the first circuit pattern 12-1 is a base line made of copper (CU) material, the second circuit pattern 12-2 is an electrode line made of copper material, and the third circuit pattern 13-3 is tin It is preferably an antioxidant film made of (SN) material.

In addition, the first circuit pattern 12-1 is a base line printed by a method such as sputtering a thin metal plate, and the second circuit pattern 12-2 is an electrode line electroplated with a metal layer. It is preferable that the circuit pattern 13-3 is an oxidation prevention film obtained by electroplating a metal layer.

As shown in FIG. 5, the first circuit pattern 12-1 to the third circuit pattern 12-3 cut a transparent PET film according to the designed size, and laminated copper foil thereon to form the first circuit pattern 12-1. ) To form.

Further, the second circuit pattern 12-2 is formed by plating copper for an electrode on the first circuit pattern 12-1, thereby lowering the insulation resistance. After that, a circuit pattern is determined and developed through semiconductor processes such as masking, exposure, and etching (peeling).

In addition, after forming the third circuit pattern 12-3 by plating tin on the second circuit pattern 12-2, the outer shape and guide holes are processed, and a test current is applied to the PCB to complete the inspection. Ship the product.

The drive line 12 formed as described above is laminated with 0.5 oz (0.0175 mm) by sputtering copper foil (CU, 0.175 mm) on the transparent circuit board 11 of transparent PET as an embodiment, and copper for electrode ( CU, 0.12mm) is electroplated, and then tin (SN, 0.05mm) is plated again to stack a pattern circuit having a thickness of 1 ounce (0.035mm). By configuring such a circuit pattern, a printed circuit board with reduced line resistance is manufactured.

Conventionally, the thickness of the circuit pattern constituting the driving line 12 was 0.5 ounce (0.0175 mm) as a single layer, whereas the present invention reduced the thickness of the circuit pattern constituting the driving line 12 to 1 ounce (0.035 mm). To reduce line resistance and stabilize power supply. In addition, heat generated when the LED 13 is emitted is minimized to show high-resolution content in a clear image.

In addition, stable power is supplied by reducing the line resistance, and since many pixels can be used on the same area of the screen, it is possible to manufacture a large-screen transparent digital signage display showing a high-resolution image.

In addition, stable and improved power is supplied when power (DC power) is supplied, and the line width of the circuit pattern can be made thinner, thereby providing a transparent digital signage display with improved transparency and visibility.

On the other hand, from above, by applying a multilayer structure including the first circuit pattern 12-1 to the third circuit pattern 12-3 to the driving line 12, the cross-sectional area of the driving line 12, which is a resistor, is reduced. It has been described to reduce the line resistance.

However, in the present invention, in addition to the method of increasing the cross-sectional area of the driving line 12, the line resistance may be reduced through a method of reducing the length of the driving line 12. This is because the line resistance is proportional to the length L and inversely proportional to the cross-sectional area A.

Accordingly, the present invention divides the circuit into two to enable bidirectional driving in the above configuration. For example, a signal is applied from the left in the first divided part, and a signal is applied from the right in the second divided part.

To this end, the driving line 12 includes a first driving line 12L and a second driving line 12R separated from each other, and the input terminal 14 is connected to the outer end of the first driving line 12L. And a second input terminal 14R connected to an outer end of the first input terminal 14L and the second drive line 12R.

In FIGS. 6A and 6B, a first driving line 12L is disposed on the left side of the driving line 12 based on the drawing, and a first input terminal 14L is connected to the left end. Correspondingly, the second driving line 12R is disposed on the right side of the drawing, and the second input terminal 14R is connected to the right end of the second driving line 12R.

Accordingly, signals are received from both sides of the driving line 12 to flash the LED 13 and generate a screen. That is, a signal is transmitted from the left through the first input terminal 14L and the first driving line 12L, and at the same time, a signal is transmitted from the right through the second input terminal 14R and the second driving line 12R. , It is driven simultaneously on both left and right sides.

7A is a specific embodiment showing a driving line of a printed circuit board according to the present invention, and FIG. 7B is a partially enlarged view (a portion of the left first driving line) of FIG. 7A.

As shown in FIG. 7A, the driving line 12 includes a first driving line 12L and a second driving line 12R.

In addition, as shown in FIG. 7B, the driving line 12 includes a power line (DC: DC+, DC-) and a data line DL. The power lines DC+ and DC- supply power to the LED 13, and the data line DL transmits a control signal for controlling the blinking of the LED 13.

In this case, the power lines DC+ and DC- include a first power line provided in the first driving line 12L and a second power line provided in the second driving line 12R, and the data line DL is And a first data line provided in the first driving line 12L and a second data line provided in the second driving line 12R.

The LED 13 is mounted on the power line (DC+, DC-) and the data line DL, and the LED 13 selected in a manner of receiving operation power and control signals is flickered. At this time, it is preferable that the LEDs 13 are mounted in the same number on the power lines DC+ and DC- divided into two and the data lines DL.

When the number of LEDs 13 installed on the first power line and the first data line and the number of LEDs 13 installed on the second power line and the second data line are the same, as an embodiment, 80 LEDs ( 13) When 80 are installed, 40 are distributed to the left and right.

Through this, the power line (DC+, DC-) and the data line (DL) are also controlled in both directions, and the LED 13 installed thereon is also controlled to blink in both directions. In addition, the same number of the left and right side groups of the LEDs 13 have equal light emission conditions.

In the present invention as described above, since one driving line 12 is divided into two including the first driving line 12L and the second driving line 12R, the power line (DC+, DC-) and the data line (DL) are ) Is also divided into two, reducing linear resistance according to the line length.

As an example, if 80 LEDs (#1 to #80) were sequentially driven from the left start point to the right end at a voltage of 5.0V, the printed circuit board 10 of the present invention is in both directions (left side) of the driving line 12. , On the right), respectively, supply 5.0V voltage to the LEDs 13.

According to this, the present invention is supplied only to the end point (#40) in the conventional half length starting from the LED of the left start point (#1) sequentially. At the same time, starting from the LED of the right start point (#80) sequentially, it is supplied only to the end point (#41) in the conventional half length.

When power (DC power) is applied in both directions (left and right) of the printed circuit board 10 as described above, power loss (DC power) due to line resistance generated in the circuit pattern can be reduced by 50%.

Accordingly, when the rated voltage and current are supplied to the driving line 12 pattern in both left and right directions of the printed circuit board 10, the power decrease according to the length is reduced. In particular, operating power is stably supplied to each LED 13 using a current driving method.

In addition, the length from the starting point to the end point of power supply among the drive lines 12 of the set length is reduced compared to the prior art, so that the luminance uniformity and the screen brightness of the plurality of LEDs 13 installed in a row are reduced toward the end. Let it.

In other words, as power is supplied in both directions (left and right), the line resistance generated in the circuit pattern decreases, and a stable voltage and current are supplied to display high-resolution clear images and digital information with uniform screen brightness and brightness. Make it possible to provide signage.

In the above, specific embodiments of the present invention have been described above. However, the spirit and scope of the present invention are not limited to these specific embodiments, and that various modifications and variations are possible within the scope of not changing the subject matter of the present invention. You will understand when you grow up.

Therefore, the embodiments described above are provided to completely inform the scope of the invention to those of ordinary skill in the technical field to which the present invention belongs, and should be understood as illustrative and non-limiting in all respects, The invention is only defined by the scope of the claims.

10: printed circuit board
11: Transparent circuit board
12(12L, 12R): drive line
12-1: first circuit pattern
12-2: second circuit pattern
12-3: 3rd circuit pattern
13: LED
14 (14L, 14R): input terminal
20: transparent base panel
30: transparent window cover
40: finishing frame

Claims (9)

In the printed circuit board with reduced line resistance for transparent digital signage,
A transparent circuit board 11;
A driving line 12 stacked on the transparent circuit board 11 and arranged to be spaced apart from each other;
A plurality of LEDs 13 mounted on the driving line 12 at regular intervals to form pixels of a screen; And
Including; an input terminal 14 provided at the end of the drive line 12,
The drive line 12,
A first circuit pattern 12-1 made of a conductive material formed on the transparent circuit board 11;
A second circuit pattern 12-2 made of a conductive material formed on the first circuit pattern 12-1; And
Including; a third circuit pattern (13-3) made of a conductive material formed on the second circuit pattern (12-2),
As the cross-sectional area of the drive line 12 is increased, linear resistance of the drive line 12 is reduced,
The first circuit pattern 12-1 is a base line made of copper (CU),
The second circuit pattern 12-2 is an electrode line made of the same material,
The third circuit pattern (13-3) is a printed circuit board with reduced line resistance, characterized in that the anti-oxidation film made of tin (SN). delete The method of claim 1,
The first circuit pattern 12-1 is a base line printed on a thin metal plate,
The second circuit pattern 12-2 is an electrode line formed by electroplating a metal layer,
The third circuit pattern (13-3) is a printed circuit board with reduced line resistance, characterized in that the anti-oxidation film electroplated a metal layer. The method of claim 1,
The driving line 12 on which the first to third circuit patterns 12-1 to 12-3 are stacked is compared to a single-layer driving line having the same width from one surface of the transparent circuit board 11. A printed circuit board having reduced line resistance, characterized in that the height is higher and the resistance value is smaller. The method of claim 1,
Each of the driving lines 12 includes a first driving line 12L and a second driving line 12R separated from each other,
The input terminal 14 includes a first input terminal 14L connected to an outer end of the first driving line 12L and a second input terminal 14R connected to an outer end of the second driving line 12R. So,
A printed circuit board with reduced line resistance, characterized in that the LED (13) is flashed to configure a screen by receiving signals from both sides of the driving line (12). The method of claim 5,
The driving line 12 is formed in a linear pattern,
A plurality of driving lines 12 of the linear pattern are arranged in parallel,
The LED (13) is a printed circuit board with reduced line resistance for transparent digital signage, characterized in that arranged in series for each driving line (12). The method of claim 5,
The drive line 12,
Including a power line (DC+, DC-) for supplying power to the LED 13 and a data line DL for controlling the blinking of the LED 13,
The power lines DC+ and DC- include a first power line provided in the first driving line 12L and a second power line provided in the second driving line 12R,
The data line DL includes a first data line provided in the first driving line 12L and a second data line provided in the second driving line 12R,
The printed circuit board with reduced line resistance, characterized in that bidirectional control of the power lines (DC+, DC-) and data lines (DL). The method of claim 7,
Print with reduced line resistance, characterized in that the number of LEDs 13 installed on the first power line and the first data line and the number of LEDs 13 installed on the second power line and the second data line are the same Circuit board. A printed circuit board (10) as in any one of claims 1, 3 to 8;
A transparent base panel 20 laminated on the bottom of the printed circuit board 10; And
A transparent digital signage display comprising: a transparent window cover (30) stacked on the upper surface of the printed circuit board (10).

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