CN101655759A - Touch control display panel - Google Patents

Abstract

The present invention provides a touch display panel, the touch display panel comprising a display panel and a touch circuit. The touch circuit is arranged on the display panel, and the touch circuit comprises a plurality of first sensing series, a plurality of second sensing series, and a plurality of sensing signal transmission circuits. Each first sensing series comprises a plurality of first sensing sub-series and a plurality of first branch wires connected between the first sensing sub-series. Each second sensing series comprises a plurality of second sensing sub-series and a plurality of second branch wires connected between the second sensing sub-series, and the first sensing series and the second sensing series are interlaced with each other. Each first sensing series and each second sensing series are respectively connected to a sensing signal transmission circuit.

Description

touch display panel

technical field

The present invention relates to a touch-sensing display panel, and in particular to a capacitive touch-sensing display panel.

Background technique

Touch panels are roughly classified into resistive touch panels, capacitive touch panels, optical touch panels, acoustic wave touch panels, and electromagnetic touch panels according to their sensing methods. Since the capacitive touch panel has the advantages of fast response time, good reliability and high durability, the capacitive touch panel has been widely used in electronic products. According to different structures and manufacturing methods, capacitive touch panels can be roughly divided into two types: surface mount type and integrated/built-in type (on-cell/in-cell). For surface-mounted capacitive touch panels, the sensing series is usually fabricated on an auxiliary substrate, and then the auxiliary substrate on which the sensing series has been fabricated is attached to the outer surface of the display. Obviously, , the externally mounted touch panel will have a certain thickness. Compared with the surface-mounted touch panel, the integrated/built-in touch panel is very beneficial to the thinning and lightening of the display.

Regardless of the integrated/built-in touch panel or the surface-mounted touch panel, they all face the problem of insufficient yield in the manufacturing process or a decrease in yield caused by electrostatic discharge. For example, most of the current integrated/built-in touch panels are made on one surface of the substrate first to make the touch circuit, and then make a color filter film on the other surface of the substrate. At the same time, the touch circuit is often broken due to insufficient yield in the manufacturing process, or damaged by electrostatic discharge. In addition, no matter the integrated/built-in touch panel or the surface-mounted touch panel, when the user touches the integrated/built-in touch panel or the surface-mounted touch panel with a finger, electrostatic discharge will occur. Phenomena may also occur, which will lead to the damage of the touch circuit.

1A and 1B are schematic diagrams of known touch circuits. Referring to FIG. 1A and FIG. 1B , a known touch circuit 100 includes a plurality of first sensing series 110 and a plurality of second sensing series 120 . Each first sensing series 110 extends along a first direction D1, and each first sensing series 110 is electrically insulated from each other. It can be seen from FIG. 1A and FIG. 1B that each first sensing series 110 includes a plurality of first sensing pads 112 and a plurality of first bridge portions 114, and each first bridge portion 114 is electrically connected to two adjacent first bridge portions 114 respectively. between a sensing pad 112 . Each second sensing series 120 extends along a second direction D2, and each second sensing series 120 is electrically insulated from each other. Each second sensing series 120 includes a plurality of second sensing pads 122 and a plurality of second bridge portions 124 , and each second bridge portion 124 is electrically connected between two adjacent second sensing pads 122 . In addition, the first sensing series 110 and the second sensing series 120 are electrically insulated from each other.

When the yield is insufficient in the manufacturing process or the electrostatic discharge phenomenon causes damage, the first sensing series 110 and the second sensing series 120 often have disconnection, as shown in the area A in FIG. 1B . Since the electrostatic discharge phenomenon cannot be completely avoided during the process and use, how to improve the electrostatic discharge protection capability of the touch circuit 100 is one of the important issues faced by designers.

When the disconnection occurs in the display area, it is difficult to repair, which often results in waste and waste. Therefore, how to reduce the need for repair has become an important issue.

Contents of the invention

The invention provides a touch display panel, which can effectively reduce the need for repairing.

The invention provides a touch display panel, which includes a display panel and a touch circuit. The touch circuit is configured on the display panel, and the touch circuit includes a plurality of first sensing series, a plurality of second sensing series and a plurality of sensing signal transmission lines. Each first sensing series includes a plurality of first sensing sub-serials and a plurality of first branch wires connected between the first sensing sub-serials. Each second sensing series includes a plurality of second sensing sub-series and a plurality of second branch wires connected between the second sensing sub-series, and the first sensing series and the second sensing series Columns are interleaved with each other. Each sensing signal transmission line is respectively connected to one of the first sensing series or one of the second sensing series.

In an embodiment of the present invention, the aforementioned display panel includes a first substrate, a second substrate and a display medium layer, wherein the second substrate is disposed above the first substrate, and the display medium layer is disposed on the first substrate and the second substrate.

In an embodiment of the present invention, the aforementioned display medium layer includes a liquid crystal layer, an electrophoretic display medium layer or an organic electroluminescence display medium layer.

In an embodiment of the present invention, the aforementioned touch circuit is disposed on an outer surface of the display panel.

In an embodiment of the present invention, the aforementioned touch circuit is built in the display panel.

In an embodiment of the present invention, each of the aforementioned first sub-sensing series includes a plurality of first sensing pads and a plurality of first bridge wires, wherein each first bridge wire is respectively connected to two adjacent first sense pads. between the test pads.

In an embodiment of the present invention, the aforementioned first branch wires are connected between first sensing pads in different first sub-sensing series.

In an embodiment of the present invention, each of the aforementioned second sub-sensing series includes a plurality of second sensing pads and a plurality of second bridging wires, wherein each second bridging wire is respectively connected to two adjacent second sensing pads. between the test pads.

In an embodiment of the present invention, the aforementioned second branch wires are connected between second sensing pads in different second sub-sensing series.

In an embodiment of the present invention, the first sensing pads, the first bridging wires and the first branch wires in each of the aforementioned first sensing series are arranged into a first network structure, and the first network structure has A plurality of first mesh holes, and the position of each first mesh hole corresponds to the position of one of the second sensing pads.

In an embodiment of the present invention, the second sensing pads, the second bridging wires and the second branch wires in the aforementioned second sensing series are arranged to form a second network structure, and the second network structure has A plurality of second mesh holes, and the position of each second mesh hole corresponds to the position of one of the first sensing pads.

In an embodiment of the present invention, the aforementioned touch display panel may further include a sensing signal readout circuit, wherein the sensing signal readout circuit communicates with the first sensing series and the second sensing series through the sensing signal transmission line. Measure the series electrical connection.

In an embodiment of the present invention, the aforementioned first sensing pad includes a transparent conductive sensing pad, and the material of the transparent conductive sensing pad includes indium tin oxide, indium zinc oxide or aluminum zinc oxide.

In an embodiment of the present invention, the aforementioned first sensing pad includes a metal mesh sensing pad, and the material of the metal mesh sensing pad includes aluminum, copper, molybdenum, tungsten or gold. In addition, the line width of the metal mesh sensing pad is, for example, between 0.1 μm and 10 μm.

Based on the above, since the sensing sub-series in the sensing series of the present invention are connected to each other through a plurality of branch wires, the sensing series of the present invention is not prone to the problem that the sensing signal cannot be transmitted due to disconnection, and further Reduce the need for patching. In addition, the branch wires in the sensing series can further reduce the damage to the sensing series caused by Electro-Static Discharge (ESD).

Description of drawings

1A and 1B are schematic diagrams of known touch circuits.

2A to 2F are schematic cross-sectional views of different touch display panels of the present invention.

3A , 3B-3C and 4A-4B are schematic diagrams of the touch circuit according to the first embodiment of the present invention.

5A , 5B to 5C and 6A to 6B are schematic diagrams of the touch circuit according to the second embodiment of the present invention.

Reference number

100: touch line

110: first sensing series

120: Second sensing series

200: touch display panel

210: display panel

212: First Substrate

214: second substrate

216: display medium layer

220: touch line

222: first sensing series

222a: the first sensing sub-serial

P1: first sensing pad

C1: First bridge wire

222b: first branch wire

224: second sensing series

224a: the second sensing sub-series

P2: Second sensing pad

C2: Second bridge wire

224b: second branch wire

226: Sensing signal transmission line

M1: first mesh

M2: second mesh

A, A1, A2, A3, A4: Areas

S: Substrate

R: Alternate Path

Detailed ways

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

2A to 2F are schematic cross-sectional views of different touch display panels of the present invention. Referring to FIG. 2A to FIG. 2F , the touch display panel 200 of this embodiment includes a display panel 210 and a touch control circuit 220 disposed on the display panel 210 . In this embodiment, the display panel 210 includes a first substrate 212, a second substrate 214, and a display medium layer 216, wherein the second substrate 214 is disposed above the first substrate 212, and the display medium layer 216 is disposed on the second substrate. Between the first substrate 212 and the second substrate 214 . For example, the first substrate 212 can be a thin film transistor array substrate (TFT array substrate) with a pixel array 212a, the second substrate 214 can be a color filter substrate (Color filter substrate), and the display medium layer 216 can be a liquid crystal layer. However, in other feasible embodiments, the first substrate 212 can be a TFT array substrate (Color filter on Array, COA) integrated with a color filter layer, and the second substrate 214 can be a TFT array substrate (Color filter on Array, COA) with a common electrode (common electrode ) against the substrate. In addition, the display medium layer 216 used in this embodiment can be an electrophoretic display medium layer, an organic electroluminescent display medium layer or other display mediums.

In this embodiment, the touch circuit 220 can be disposed on an outer surface of the display panel 210, in other words, the touch circuit 220 can be disposed on the first substrate 212 or the second substrate 214 (as shown in FIG. 2A, FIG. 2D), it can also be built into the display panel 210 (as shown in FIG. 2B, FIG. 2E). In addition, the touch circuit 220 can also be disposed on the auxiliary substrate S first, and then the auxiliary substrate S is attached to the first substrate 212 or the second substrate 214 (as shown in FIG. 2C and FIG. 2F ). When the touch circuit 220 is disposed on the outer surface of the display panel 210, the touch display panel 200 is a so-called integrated (on-cell) touch display panel (as shown in FIGS. 2A and 2D ). When the touch circuit 220 When the auxiliary substrate S is externally attached to the outer surface of the display panel 210, the touch display panel 200 is a so-called external touch display panel (as shown in FIG. 2C and FIG. 2F ). When the touch circuit 220 is built into the display When the panel 210 is inside, the touch display panel 200 is a so-called in-cell touch display panel ( FIG. 2B , FIG. 2E ).

In detail, the touch control circuit 220 may be directly formed on the outer surface of the second substrate 214 of the display panel 210, as shown in FIG. 2A. In addition, the touch circuit 220 can also be formed on an auxiliary substrate S first, and then the substrate S on which the touch circuit 220 has been formed is pasted on the outer surface of the second substrate 214 of the display panel 210, as shown in FIG. 2C . Similarly, the touch control circuit 220 can be directly formed on the outer surface of the first substrate 212 of the display panel 210, as shown in FIG. 2D. In addition, the touch circuit 220 can also be formed on a substrate S first, and then the substrate S with the touch circuit 220 formed on the outer surface of the first substrate 212 of the display panel 210 is pasted, as shown in FIG. 2F .

Based on the above, the touch circuit 220 can be directly formed on the inner surface of the second substrate 214 of the display panel 210, as shown in FIG. 2B, or directly formed on the inner surface of the first substrate 212 of the display panel 210, as shown in FIG. 2E is shown.

The touch circuit 220 will be described in detail in conjunction with FIGS. 3A , 3B-3C and 4A-4B below.

First embodiment:

3A , 3B-3C and 4A-4B are schematic diagrams of the touch circuit according to the first embodiment of the present invention. Please refer to FIG. 3A , FIG. 3B to FIG. 3C , the touch circuit 220 of this embodiment includes a plurality of first sensing series 222 , a plurality of second sensing series 224 and a plurality of sensing signal transmission lines 226 . Each first sensing series 222 includes a plurality of first sensing sub-series 222a and a plurality of first branch wires 222b connected between the first sensing sub-series 222a. Each second sensing series 224 includes a plurality of second sensing sub-series 224a and a plurality of second branch wires 224b connected between the second sensing sub-series 224a, and the first sensing series 222 and The second sensing series 224 are interlaced with each other. Each sensing signal transmission line 226 is respectively connected to one of the first sensing series 222 or one of the second sensing series 224 .

In this embodiment, each of the aforementioned first sub-sensing series 222a includes a plurality of first sensing pads P1 and a plurality of first bridge wires C1, wherein each first bridge wire C1 is respectively connected to two adjacent first between sensing pad P1. It can be seen from FIG. 3A , FIG. 3B and FIG. 3C that the first branch wire 222b is connected between the first sensing pads P1 in different first sub-sensing series 222a. In addition, each of the aforementioned second sub-sensing series 224a includes a plurality of second sensing pads P2 and a plurality of second bridge wires C2, wherein each second bridge wire C2 is respectively connected to two adjacent second sensing pads P2 between. It can be seen from FIG. 3B and FIG. 3C that the second branch wire 224b is connected between the second sensing pads P2 in different second sub-sensing series 224a. 3A, 3B to 3C, in this embodiment, taking two first sub-sensing series 224a and two second sub-sensing series 224b as an example, four adjacent first sensing series The measuring pad P1 constitutes a first sensing unit along the first direction (for example, the direction D1), and four adjacent second sensing pads P2 constitute a second sensing unit along the second direction (for example, the direction D2). unit. The first sub-sensing series 224 a and the second sub-sensing series 224 b of the present invention also use multiple sub-sensing series, such as three or four sub-sensing series, to increase the sensing effect.

In design, the side length L of each first sensing pad P1 and each second sensing pad P2 is between 0.5 millimeters (mm) and 8 millimeters (mm), and preferably between 1 mm and 6 mm. Between, for example, 4mm. The distance g between the first sensing pad P1 and the second sensing pad P2 is between 0.01 mm and 1 mm, and preferably between 0.1 mm and 0.8 mm, such as 0.5 mm. The side length L and distance g of the first sensing pad P1 and the second sensing pad P2 can be modified according to actual design requirements.

In an embodiment of the present invention, the first sensing pad P1 or the second sensing pad P2 includes a transparent conductive sensing pad, and the material of the transparent conductive sensing pad includes indium tin oxide, indium zinc oxide, or aluminum zinc oxide. things. In other embodiments of the present invention, the first sensing pad P1 or the second sensing pad P2 includes a metal mesh sensing pad, and the material of the metal mesh sensing pad includes aluminum, copper, molybdenum, tungsten or gold. . In addition, the line width of the metal mesh sensing pad is, for example, between 0.1 μm and 10 μm. The mesh pattern of the metal mesh sensing pad can be triangle, rectangle, rhombus, hexagon, polygon and circle, etc., taking the metal mesh sensing pad composed of a rectangular pattern as an example, the side length of the rectangular pattern is, for example, between Between 10 microns and 600 microns.

Referring to FIG. 3A, FIG. 3B to FIG. 3C, the first sensing pads P1, the first bridge wires C1 and the first branch wires 222b in each first sensing series 222 are arranged into a first mesh structure (meshed structures), The first mesh structure has a plurality of first meshes M1, and the position of each first mesh M1 corresponds to the position of one of the second sensing pads P2. In addition, the second sensing pads P2, the second bridge wires C2 and the second branch wires 224b in each second sensing series 224 are arranged in a second network structure, and the second network structure has a plurality of second networks. hole M2, and the position of each second mesh M2 corresponds to the position of one of the first sensing pads P1. Since the first sensing pad P1 is interlaced in the second sensing unit, and the second sensing pad P2 is interlacing in the first sensing unit, it is easier for the user's fingers to simultaneously touch the first sensing pad P1 and the second sensing pad. Two sensing pads P2, so this design is easier to achieve the purpose of position detection, and can avoid misoperation.

It should be noted that since the first bridging wire C1 intersects with the second branch wire 224b, the first bridging wire C1 and the second branch wire 224b need to be made of different layers of patterned films to avoid the first bridging wire C1 Short circuit with the second branch wire 224b at the intersection. In a preferred embodiment, an insulating layer may be disposed between the first bridging wire C1 and the second branch wire 224b to prevent the first bridging wire C1 and the second branch wire 224b from being short-circuited at the intersection. Similarly, since the second bridge wire C2 and the first branch wire 222b intersect, the second bridge wire C2 and the first branch wire 222b need to be made of different layers of patterned thin films to avoid the second bridge wire C2 and the first branch wire 222b. The bridging wire C2 and the first branch wire 222b are short-circuited at the intersection. In a preferred embodiment, an insulating layer may be arranged between the second bridging wire C2 and the first branch wire 222b to avoid short circuit at the intersection of the second bridging wire C2 and the first branch wire 222b. In a variant embodiment, and the insulating layer can be replaced by multiple patterned insulating blocks, the patterned insulating blocks are only arranged at the intersections, which can avoid short circuits at the intersections, and at the same time make the first sensing pad P1 and the second sensing pad P1 Measuring pad P2 is made of the same layer, which can not only increase the light transmittance, but also improve the uniformity of sensing.

For example, when the first bridge wire C1, the first sensing pad P1, and the second sensing pad P2 are fabricated together, the second branch wire 224b can be fabricated using another layer of metal film (variation embodiment 1) . Similarly, when the second branch wire 224b, the first sensing pad P1 and the second sensing pad P2 are fabricated together, the first bridge wire C1 can be fabricated using another layer of metal film (variation embodiment 2). In addition, when the second bridge wire C2 , the first sensing pad P1 and the second sensing pad P2 are fabricated together, the first branch wire 222 b can be fabricated using another layer of metal film (variation embodiment 3). Similarly, when the first branch wire 222b, the first sensing pad P1, and the second sensing pad P2 are fabricated together, the second bridge wire C2 can be fabricated using another layer of metal film (variation embodiment 4).

Based on the above, the manufacturer can choose the variation embodiment 1 or the variation embodiment 2 to make the first bridging wire C1 and the second branch wire 224b interlaced with each other. Of course, the manufacturer can choose the variation embodiment 3 or the variation embodiment 4 to make The second bridging wires C2 and the first branch wires 222b intersect with each other. In addition, the above-mentioned variation embodiment 1 can be arbitrarily matched with the variation embodiment 3 or the variation embodiment 4. Similarly, the aforementioned variation embodiment 2 can also be arbitrarily matched with the variation embodiment 3 or the variation embodiment 4.

In this embodiment, the touch display panel 200 may further include a sensing signal readout circuit 230, wherein the sensing signal readout circuit 230 communicates with the first sensing series 222 and the second sensing series 222 through the sensing signal transmission line 226. The test series 224 is electrically connected.

4A to 4B, when the first bridge wire C1 in the area A1 is disconnected, the first sensing series 222 can still maintain the connection between the first sensing pads P1 through the adjacent first branch wire 222b. The electrical connection relationship, so that the sensing signal can still be transmitted (such as the alternative path R in the figure). Similarly, when the second bridge wire C2 in the area A2 is disconnected, the second sensing series 224 can still maintain the electrical connection between the second sensing pads P2 through the second branch wire 224b, so that the sense The test signal can still be transmitted (as shown in the alternative path R). Due to the design of the first branch wire 222 b and the first bridging wire C1 , the replacement path R is quite close to the resistance of the original transmission path, so it is not easy to cause the problem of sensing signal delay. Accept the above. In this embodiment, the first sensing series 222 and the second sensing series are less likely to fail to transmit sensing signals due to disconnection, thus reducing the need for repairs.

Second embodiment:

5A , 5B to 5C and 6A to 6B are schematic diagrams of the touch circuit according to the second embodiment of the present invention. Please refer to FIG. 5A, FIG. 5B to FIG. 5C, the touch circuit 200' of this embodiment is similar to the touch circuit 200 of the first embodiment, the main difference lies in the first touch pad P1 and the second touch pad P2 is arranged differently.

It can be seen from FIG. 5A, FIG. 5B to FIG. 5C that the first touch pads P1 in the same first sensing sub-series 222a are arranged in a zigzag (zigzag), and the first touch pads P1 are arranged through a plurality of The inclined first bridge wires C1 are electrically connected to each other.

6A to 6B, when the first bridge wire C1 in the area A3 is disconnected, the first sensing series 222 can still maintain the electrical connection between the first sensing pads P1 through the first branch wire 222b. connection relationship. Likewise, when the second bridge wire C2 in the area A4 is disconnected, the second sensing series 224 can still maintain the electrical connection relationship between the second sensing pads P2 through the second branch wire 224b. Accept the above. In this embodiment, the first sensing series 222 and the second sensing series are less likely to fail to transmit sensing signals due to disconnection, thus reducing the need for repairs.

Based on the above, since the sensing sub-series in the sensing series of the present invention are connected to each other through a plurality of branch wires, the sensing series of the present invention is less prone to the problem that the sensing signal cannot be transmitted due to disconnection, and further Reduce the need for patching. In addition, the branch wires in the sensing series can further reduce the damage of the electrostatic discharge to the sensing series.

In addition, since the sub-sensing series in the two directions are interlaced with each other, it is easier for the user's finger to touch the first sensing pad P1 and the second sensing pad P2 at the same time, so this design is easier to achieve the purpose of position detection .

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore The protection scope of the present invention shall be determined by the scope defined in the claims.

Claims (18)

1. A touch display panel, characterized in that, the touch display panel comprises: a display panel; A touch circuit configured on the display panel, wherein the touch circuit includes: A plurality of first sensing series, wherein each of the first sensing series includes a plurality of first sensing sub-serials and a plurality of first branches connected between the first sensing sub-serials wire; A plurality of second sensing series, wherein each of the second sensing series includes a plurality of second sensing sub-series and a plurality of second branches connected between the second sensing sub-series wires, and the first sensing series are interleaved with the second sensing series; and A plurality of sensing signal transmission lines, wherein each of the sensing signal transmission lines is respectively connected to one of the first sensing series or one of the second sensing series. 2. The touch display panel according to claim 1, wherein the display panel comprises: a first substrate; a second substrate disposed above the first substrate; and A display medium layer is disposed between the first substrate and the second substrate. 3. The touch display panel according to claim 2, wherein the display medium layer comprises a liquid crystal layer, an electrophoretic display medium layer or an organic electroluminescent display medium layer. 4. The touch display panel as claimed in claim 2, wherein the touch control circuit is disposed on an outer surface of the display panel. 5 . The touch display panel according to claim 4 , further comprising an auxiliary substrate disposed between the touch circuit and the display panel. 6. The touch display panel as claimed in claim 1, wherein the touch control circuit is built in the display panel. 7. The touch display panel according to claim 1, wherein each of the first sub-sensing series comprises: a plurality of first sensing pads; and A plurality of first bridging wires, wherein each of the first bridging wires is respectively connected between two adjacent first sensing pads. 8. The touch display panel as claimed in claim 7, wherein the first branch wires are connected between the first sensing pads in different first sub-sensing series. 9. The touch display panel according to claim 7, wherein each of the second sub-sensing series comprises: a plurality of second sense pads; and A plurality of second bridging wires, wherein each of the second bridging wires is respectively connected between two adjacent second sensing pads. 10 . The touch display panel as claimed in claim 9 , wherein the second branch wires are connected between the second sensing pads in different second sub-sensing series. 11 . 11. The touch display panel according to claim 9, wherein the first sensing pads, the first bridge wires and the first sensing pads in each of the first sensing series A branch wire is arranged into a first mesh structure, and the first mesh structure has a plurality of first mesh holes, and the position of each first mesh hole corresponds to the position of one of the second sensing pads. 12. The touch display panel according to claim 9, wherein the second sensing pads, the second bridge wires and the first sensing pads in each of the second sensing series The two branch wires are arranged into a second mesh structure, and the second mesh structure has a plurality of second mesh holes, and the position of each second mesh hole corresponds to the position of one of the first sensing pads. 13. The touch display panel according to claim 1, wherein the touch display panel further comprises a sensing signal readout circuit, wherein the sensing signal readout circuit passes the sensing signals The transmission line is electrically connected to the first sensing series and the second sensing series. 14. The touch display panel as claimed in claim 7, wherein the first sensing pads comprise transparent conductive sensing pads. 15. The touch display panel as claimed in claim 14, wherein the material of the transparent conductive sensing pads comprises indium tin oxide, indium zinc oxide or aluminum zinc oxide. 16. The touch display panel as claimed in claim 7, wherein the first sensing pads comprise metal mesh sensing pads. 17. The touch display panel as claimed in claim 16, wherein the metal mesh sensing pads are made of aluminum, copper, molybdenum, tungsten or gold. 18 . The touch display panel as claimed in claim 16 , wherein the line width of the metal mesh sensing pads is between 0.1 μm and 10 μm.

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