JP2006350382A - Method for manufacturing liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress element breakage caused by static electricity along a division line in a liquid crystal display device which divides a scanning area into two and drives them. <P>SOLUTION: A short circuit wiring 15 which electrically connects a short ring 9a and a short ring 9b to each other is formed in an area inside a dividing line 11b of a liquid crystal cell and at least a portion of the short circuit wiring is formed in an area enclosed with a line dividing the short rings and the dividing line 11b of the liquid crystal cell. Consequently, no potential difference is generated across the dividing line of the scanning area even while the liquid crystal cell is cut out of mother glasses 2a and 2b, so discharge breakdown of a switching element can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a liquid crystal display device, and in particular, a liquid crystal display device having a two-terminal non-linear element and dividing a display screen into a plurality of regions and scanning and driving the regions. It is related with the manufacturing method.

In recent years, liquid crystal display devices are required to have a large screen and high image quality. In a conventional liquid crystal display device, a plurality of stripe electrodes are provided in parallel on the opposing surfaces of a pair of opposing glass substrates, and both substrates are bonded so that the stripe electrodes on the opposing surfaces of the glass substrates are orthogonal to each other. In addition, a TN (Twisted Nematic) liquid crystal or STN (Super Twisted Nematic) liquid crystal is injected into the gap between the pair of opposing glass substrates, and a simple matrix by a voltage averaging method is used. I was driving.

  However, according to the driving method, a sufficient contrast ratio cannot be obtained as the number of scanning lines increases, so that a large screen and high-quality display cannot be realized sufficiently.

  For this reason, an active driving method in which a switching element is provided for each pixel constituting the display screen has been developed. As the switching element, a thin film transistor (TFT) element or a two-terminal nonlinear element has been put into practical use. By providing the switching element in this manner, a large screen and a high-capacity display with high image quality that require a large number of scanning lines can be realized.

  However, when an attempt is made to realize a liquid crystal display device with a larger screen and higher image quality, it is necessary to further increase the number of scanning lines accordingly, so that even when a switching element is used, good display cannot be performed. For this reason, for example, the signal lines are divided into two groups and scanned within each group for driving display, that is, by dividing the scanning area on the display screen into two, By driving with the number of scanning lines substantially halved without changing the number of lines, an even larger screen and higher image quality are realized.

  FIG. 3 is an exploded perspective view showing a state before the liquid crystal display cell according to the conventional manufacturing method is cut out from the mother glass. In this figure, a liquid crystal display device using a two-terminal nonlinear element as a switching element and driving and displaying the area to be scanned on the display screen in two parts is shown.

  In general, one pixel is composed of a signal wiring 4, a two-terminal nonlinear element 5, a pixel electrode 7, and a counter electrode 12 so that one pixel is enlarged and displayed in the circle of FIG. 3. The two-terminal nonlinear element 5 includes a lower electrode 4a, a thin insulator (not shown) formed so as to cover the lower electrode 4a, and an upper electrode 6. These wirings and electrodes are formed on the element-side mother glass 2b by using a photolithography method.

  The insulator on the lower electrode 4a is formed by using, for example, an anodic oxidation method. For this reason, the element-side mother glass 2b on which the two-terminal nonlinear element is formed is provided with an anodic oxidation wiring 10 for connecting the lower electrode 4a of the element-side mother glass 2b to the anode during the anodic oxidation process. Since this insulator is very thin and has a thickness of about 400 to 700 mm, it is susceptible to dielectric breakdown due to static electricity during the manufacturing process. Therefore, countermeasures against static electricity during the manufacturing process are important. Further, element side terminal groups 8a and 8b are formed on the element side mother glass 2b as terminals for supplying an electric signal for driving the liquid crystal display cell.

  In order to prevent destruction of the two-terminal nonlinear element due to static electricity, short rings 9a and 9b for connecting signal wirings to each other are formed on the element-side mother glass 2b. The short ring is not removed until just before the drive circuit member is attached. As a result, the concentration of charges on one terminal can be avoided, and this is particularly effective in preventing element destruction of pixels near the terminal side.

  Thus, the element-side mother glass 2b in which the matrix-like pixels, the two-terminal nonlinear element, and the signal wiring are formed is completed.

  Further, the element-side mother glass 2 b and the opposed-side mother glass 2 a on which the stripe-shaped opposed electrode 12 is formed are bonded together with a sealing material 14 interposed therebetween. The opposing mother glass 2a is provided with an opposing terminal 13 as a terminal for supplying an electric signal for driving.

  By dividing along the dividing lines 11a and 11b of both the mother glasses bonded in this way, one liquid crystal display cell 1 as shown in FIG. 4A can be obtained.

  Although FIG. 3 shows an example in which one liquid crystal display cell is cut out, usually, a plurality of liquid crystal display cells are formed at the same time, and the production efficiency is improved by cutting out from a large mother glass.

  Liquid crystal is injected into and sealed in the liquid crystal display cell 1 in the state shown in FIG. 4A, and a lighting inspection and an appearance inspection are performed.

Thereafter, as shown in FIG. 4B, the short rings 9a and 9b are removed, and the individual terminals included in the element-side terminal groups 8a and 8b are made electrically independent. As a method for removing the short ring, for example, there is a method in which the edge portions of the element side substrate 3b are cut and chamfered to simultaneously scrape the short rings 9a and 9b at the substrate end. Thus, a liquid crystal display device has been completed by attaching a driving circuit member to the terminal of the liquid crystal display cell 1 from which the short ring has been removed.
Japanese Patent Laid-Open No. 5-158076 JP-A-2-190820 JP-A-7-175086 JP-A-10-31225 Japanese Patent Laid-Open No. 10-96951 JP-A-2-190820

  However, a switching element having an insulating thin film such as a two-terminal nonlinear element has a low electrical withstand voltage, and thus is easily broken down by static electricity generated during the manufacturing process.

  In particular, in the case of a liquid crystal display device that drives and displays an area to be scanned on the display screen, a potential difference may occur at the dividing line as a boundary. Therefore, the discharge generated here is provided in the pixels along the dividing line. In some cases, the switching elements such as the two-terminal nonlinear elements are intensively destroyed.

  Further, as shown in FIG. 3, in the state before the liquid crystal display cell is cut out from the large mother glass, since there is the anodic oxidation wiring 10, one element side terminal group 8a and the other element side terminal group 8b are electrically connected. The potential difference is not generated. However, as shown in FIG. 4A, after being cut out as the liquid crystal display cell 1, the element side terminal group 8a and the element side terminal group 8b are electrically independent. Therefore, electrostatic breakdown of the switching element along the dividing line of the scanning region is likely to occur in the process and handling after the liquid crystal display cell is cut into a single unit.

  For this reason, it has been proposed to control the humidity during the process, to provide the worker with grounding, or to apply an ion blower as countermeasures against static electricity, but it has not been possible to completely prevent dielectric breakdown of the switching element.

  As a result, for example, in a two-terminal nonlinear element, the upper and lower electrodes are short-circuited and do not function as a switching element, and the connected pixel appears as a point defect on the screen. There was a problem of worsening.

  The present invention has been made in view of the above-described conventional problems, and in particular, there is provided a method for manufacturing a liquid crystal display device capable of suppressing defects generated in switching elements in the vicinity of dividing lines when there are a plurality of regions to be scanned. It is intended to provide.

  A method of manufacturing a liquid crystal display device according to the present invention includes a plurality of pixel electrodes arranged in a matrix, a plurality of signal lines formed between the pixel electrodes, and a switching element that connects the pixel electrodes and the signal lines. A liquid crystal display cell in which liquid crystal is sealed between the element side substrate and the counter substrate, and the signal wiring is divided into two groups that are driven independently. A method of manufacturing a liquid crystal display device divided by line, wherein the pixel electrode, the signal wiring, and the switching element are formed on the mother glass, and the mother glass is divided along a rectangular substrate dividing line. A substrate forming step of forming an element side substrate, and a cell forming step of forming a liquid crystal display cell by enclosing a liquid crystal between the substrates with the element side substrate facing the counter substrate, The plate forming step forms a short ring for electrically connecting the signal wiring for each of the groups, outside the signal wiring terminal and inside the substrate cutting line, along the opposing substrate cutting lines. The short ring forming step and the short-circuit wiring for electrically short-circuiting each group of short rings are arranged inside the substrate dividing line, and partly outside the counter substrate in the cell forming step. A liquid crystal display that passes through the extended line of the short ring so as to be positioned, is a region on one side of the other pair of two opposite sides of the substrate cutting line, and the element side substrate and the counter substrate face each other And a short-circuit wiring forming step for forming the cell so as to pass along one side region of the cell.

  The method for manufacturing a liquid crystal display device according to the present invention includes a plurality of pixel electrodes arranged in a matrix, a plurality of signal lines formed between the pixel electrodes, and a plurality of element side terminals for supplying an electric signal. A liquid crystal display cell having an element side substrate having a group and a switching element for connecting the pixel electrode and the signal wiring, and having liquid crystal sealed between the element side substrate and the counter substrate; The element side terminal group is a manufacturing method of a liquid crystal display device that is divided into two groups that are independently driven, and the pixel electrode, the signal wiring, and the element side terminal group are provided on a mother glass. And forming a switching element and dividing the mother glass along a rectangular substrate dividing line to form an element side substrate, the element side substrate facing the opposite substrate, and encapsulating liquid crystal between the substrates The A cell forming step for forming a crystal display cell, wherein the substrate forming step includes a short ring for electrically connecting the element side terminal group for each of the groups, outside the signal wiring terminals and on the substrate. Inside the dividing line, a short ring forming process for forming along the two opposing substrate dividing lines and a short-circuit wiring for electrically short-circuiting each group of short rings are all arranged inside the dividing line. And one side of the other pair of two sides facing each other in the substrate cutting line, passing over the extension of the short ring so that a part is located outside the counter substrate in the cell forming step And a short-circuit wiring forming step for forming the element-side substrate and the counter substrate so as to pass along one side region of the liquid crystal display cell. It is.

  The method for manufacturing a liquid crystal display device according to the present invention includes a plurality of pixel electrodes arranged in a matrix, a plurality of signal lines formed between the pixel electrodes, and an element side terminal group for supplying an electric signal. A method of manufacturing a liquid crystal display device in which a switching element for connecting a pixel electrode and a signal wiring is formed on a mother glass to manufacture an element side substrate of a liquid crystal display cell. The element side terminal group and the first element side terminal are finally electrically independent, and the second element side is formed at a position facing the first element side terminal group across the pixel region. An anodizing wiring for supplying current to the lower electrode of the switching element from the first element side terminal group and the second element side terminal group on the mother glass, and a liquid crystal display On the mother glass in the cell area The short-circuit wiring that extends from the first element-side terminal group to the second element-side terminal group and does not depend on the driving of the liquid crystal display is formed separately from the anodizing wiring and with the same material as the anodizing wiring And finally the anodizing wiring, the first element-side terminal group, the second element-side terminal group, and the short-circuit wiring are cut from each other.

  The liquid crystal display device manufacturing method of the present invention is characterized in that, in the above-described liquid crystal display device manufacturing method, the switching element is a two-terminal nonlinear element.

  Further, the method for manufacturing a liquid crystal display device according to the present invention is the above-described method for manufacturing a liquid crystal display device, wherein the part of the short-circuit wiring is formed on the substrate end face on the extension line of the short ring and in the vicinity of the dividing line of the liquid crystal display cell It is characterized by forming.

  Hereinafter, the operation of the above configuration will be described. According to the present invention, the short-circuit wiring that electrically connects one short ring and the other short ring is provided inside the line that divides the liquid crystal display cell. Therefore, even when a plurality of liquid crystal display cells are cut out from a large mother glass and divided into a single liquid crystal display cell, one signal wiring pattern and the other signal are separated by dividing lines between the plurality of scanning regions. No potential difference occurs between the wiring patterns. Therefore, even when the liquid crystal display cell is in a single state, it is possible to prevent the switching element from being destroyed by discharge.

  Further, according to the present invention, at least a part of the short-circuit wiring that electrically connects one short ring and the other short ring is surrounded by a line that divides the short ring and a line that divides the liquid crystal display cell. Formed in the region. For this reason, by finally dividing the short ring, it is possible to simultaneously cut a part of the short-circuited wiring and electrically disconnect the short-circuited wiring.

  Further, since the insulating thin film is particularly thin, it is possible to prevent breakdown due to discharge even in a two-terminal nonlinear element that is vulnerable to electrostatic breakdown.

  In addition, since a part of the short-circuit wiring that electrically connects the one short ring and the other short ring is disposed on the substrate end face near the dividing line of the liquid crystal display cell on the extension line of the short ring, By chamfering the end face of the substrate facing the short ring, both the short-circuit wiring and the short ring can be easily divided.

  According to the present invention, even after the liquid crystal display cell is cut out, the two element side terminal groups 8a and 8b are electrically connected by the short rings 9a and 9b and the short-circuit wiring 15 provided in the liquid crystal display cell. Therefore, there is an effect that it is possible to suppress the switching element destruction near the divisional line in the scanning region due to static electricity, which occurs in the process from cutting out the liquid crystal display cell alone to removing the short ring.

  In addition, since a part of the short-circuit wiring 15 is disposed on the end face near the element-side dividing line 11b, the short ring and the removal of the short-circuit wiring 15 can be simultaneously cut.

  Further, since the short-circuit wiring 15 can be formed simultaneously with the switching element, a process associated with the formation and removal of the short-circuit wiring 15 does not occur. Therefore, there is an effect that it is possible to provide a liquid crystal display device with few defects without an increase in cost.

  Embodiment Modes of the present invention will be described below with reference to FIGS. 1, 2A, and 2B.

  FIG. 1 is an exploded perspective view showing a state before a liquid crystal display cell manufactured by a manufacturing method according to an embodiment of the present invention is cut out from mother glasses 2a and 2b. For explanation, FIG. 1 shows a case where one liquid crystal display cell is cut out from the mother glass. However, the method for manufacturing a liquid crystal display device of the present invention is also effective when a plurality of liquid crystal display cells are cut out from the mother glass.

  FIG. 2A is a perspective view showing a state of the liquid crystal display cell immediately after being cut out from the mother glass. FIG. 2B is a perspective view showing the liquid crystal display cell immediately after removing the short ring. FIG. 2A shows a part of the opposite substrate 3a cut out for the sake of explanation.

  1, 2 </ b> A, and 2 </ b> B, the manufacturing method according to the embodiment of the present invention includes a short-circuit wiring 15 that electrically connects the short rings 9 a and 9 b of the liquid crystal display cell on the element side. It has a novel feature relating to including a step of forming on the substrate 3b. However, configurations common to the conventional manufacturing method shown in FIGS. 3, 4A, and 4B are also denoted by the same reference numerals in FIGS. 1, 2A, and 2B.

  As shown in FIGS. 1 and 2A, all the sections of the short-circuit wiring 15 are formed so as to be inside the element-side dividing line 11b of the liquid crystal display cell. Further, a part of the short-circuit wiring 15 is formed so as to be positioned on the extension line of the short ring, and as a result, a part of the short-circuit wiring 15 is positioned outside the dividing line of the short ring. Formed.

  By forming the short-circuit wiring 15 in this way, even if the liquid crystal display cell 1 is cut out as shown in FIG. 2A from the state before cutting out from the mother glasses 2a and 2b as shown in FIG. The respective terminals of the side terminal group 8a and the element side terminal group 8b could be kept electrically connected via the short rings 9a and 9b and the short-circuit wiring 15. Further, since the entire section of the short-circuit wiring 15 is formed outside the seal material 14 (that is, the region filled with liquid crystal), even if a part of the short-circuit wiring 15 remains after the liquid crystal display device is completed. The voltage applied between the counter electrode 12 and the counter electrode 12 did not disturb the alignment of the liquid crystal molecules or cause any troubles such as unnecessary lighting.

  In the present embodiment, the short-circuit wiring 15 is formed of Ta simultaneously with the signal wiring 4 (and the lower electrode 4a of the two-terminal nonlinear element, the element side terminal groups 8a and 8b, and the short rings 9a and 9b). Further, instead of Ta, patterning may be performed using a conductive material, for example, an upper electrode material (for example, Ti) or a pixel electrode material (for example, ITO). Even if any of the signal wiring material, the upper electrode material, and the pixel electrode material is used, the short-circuit wiring 15 can be patterned by using the conventional element forming process, so that it is necessary to increase the number of manufacturing processes for forming the short-circuit wiring 15. There is no.

  Next, the liquid crystal display cell is cut out from the mother glasses 2a and 2b along the opposing side dividing line 11a and the element side dividing line 11b. As a result, it is cut out like a liquid crystal display cell 1 as shown in FIG. Thereafter, liquid crystal injection / sealing, lighting inspection, and the like are performed on the liquid crystal display cell 1. In the conventional case, the liquid crystal display cell 1 is in a state where the element side terminal group 8a and the element side terminal group 8b are not connected as shown in FIG. In such a process, the element breakage of the dividing line in the scanning region was frequent. However, according to the manufacturing method according to the present embodiment, since the element side terminal group 8a and the element side terminal group 8b are electrically connected, discharge due to static electricity is applied to the two-terminal nonlinear element near the dividing line in the scanning region. Since generation | occurrence | production can be suppressed, the yield rate of the liquid crystal display device was able to be improved.

  Thereafter, the short rings 9a and 9b are removed by chamfering, for example, and a necessary circuit member is attached. However, since a part of the short-circuit wiring 15 is arranged on the element side dividing line 11b of the element side substrate 3b, the short ring 9a and Simultaneously with the removal of 9b, a part of the short-circuit wiring 15 could be removed. Therefore, it is not necessary to add a new process (for example, laser irradiation) for cutting off the connection between the short rings 9a and 9b and the short-circuit wiring 15, and the two edges facing the short rings 9a and 9b are chamfered as in the conventional case. Only the short-circuit wiring 15 could be cut. 2B, even if a part of the short-circuit wiring 15 remains on the element-side substrate 3b, as long as a part of the short-circuit wiring 15 is cut, the element-side terminal group 8a and the element The electrical short circuit of the side terminal group 8b could be cut.

  As described above, the method for manufacturing a liquid crystal display device according to the present invention includes a plurality of pixel electrodes in which a liquid crystal is held between a pair of opposing substrates and arranged in a matrix on at least one opposing surface of the substrate, and the pixels A plurality of signal lines are formed between the electrodes, and the signal lines are divided into a plurality of groups by using a liquid crystal display cell in which the signal lines and the pixel electrodes are connected via switching elements. A method of manufacturing a liquid crystal display device that scans and displays a plurality of liquid crystal display cells on a pair of opposing substrates and then divides each of the liquid crystal display cells. In the method, a step of forming a short ring for electrically connecting the signal wirings for each group inside a line that divides the liquid crystal display cell; and All the sections pass through the inner area of the line that divides the liquid crystal display cell, and at least some of the sections divide the short ring. Forming a line and a region surrounded by the line dividing the liquid crystal display cell.

  In the method for manufacturing a liquid crystal display device according to the present invention, the switching element is a two-terminal nonlinear element.

  In the method for manufacturing a liquid crystal display device according to the present invention, a part of the short-circuit wiring is formed on an end face of the substrate on the extension line of the short ring and in the vicinity of the dividing line of the liquid crystal display cell.

It is a disassembled perspective view which shows the state before cutting out from the mother glass of the liquid crystal display cell concerning the manufacturing method of this invention. It is a perspective view which shows the liquid crystal display cell (A) concerning the manufacturing method of this invention immediately after cutting out from mother glass, and the liquid crystal display cell (B) concerning the manufacturing method of this invention immediately after removing a short ring. It is a disassembled perspective view which shows the state before cutting out from the mother glass of the liquid crystal display cell concerning the conventional manufacturing method. It is a perspective view which shows the liquid crystal display cell (A) concerning the conventional manufacturing method immediately after cutting out from mother glass, and the liquid crystal display cell (B) concerning the conventional manufacturing method immediately after removing a short ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display cell 2a Opposite side mother glass 2b Element side mother glass 3a Opposite side substrate 3b Element side substrate 4 Signal wiring 4a Lower electrode of two-terminal nonlinear element 5 Two-terminal nonlinear element 6 Upper electrode of two-terminal nonlinear element 7 Pixel electrode 8a Element side terminal 8b Element side terminal 9a Short ring 9b Short ring 10 Anodizing wiring 11a Opposing side dividing line 11b Element side dividing line 12 Counter electrode 13 Opposing side terminal 14 Sealing material 15 Short circuit wiring

Claims (5)

An element-side substrate including a plurality of pixel electrodes arranged in a matrix, a plurality of signal lines formed between the pixel electrodes, and a switching element that connects the pixel electrodes and the signal lines;
It has a liquid crystal display cell in which liquid crystal is sealed between the element side substrate and the counter substrate,
A method of manufacturing a liquid crystal display device in which the signal wiring is divided into two groups that are driven independently by dividing lines,
A substrate forming step of forming the pixel electrode, the signal wiring, and the switching element on the mother glass, and forming the element side substrate by dividing the mother glass along a rectangular substrate dividing line;
A cell forming step of forming a liquid crystal display cell by enclosing the element side substrate to the counter substrate and enclosing a liquid crystal between the substrates,
The above substrate forming process
Forming a short ring for electrically connecting the signal wiring for each group, outside the terminal of the signal wiring and inside the substrate cutting line, along the opposing substrate cutting lines; ,
Short-circuit wiring that electrically short-circuits the short rings of each group so that the whole is arranged inside the substrate dividing line and partly located outside the counter substrate in the cell formation process. Along one side region of the liquid crystal display cell that is on the extension line of the ring and that is on one side of the other pair of two sides facing each other on the substrate cutting line, and on which the element side substrate and the counter substrate face each other A method of manufacturing a liquid crystal display device, comprising: a step of forming a short circuit wiring so as to pass through. Switching connecting a plurality of pixel electrodes arranged in a matrix, a plurality of signal wirings formed between the pixel electrodes, a plurality of element side terminal groups for supplying an electric signal, and the pixel electrodes and the signal wirings An element-side substrate provided with an element;
It has a liquid crystal display cell in which liquid crystal is sealed between the element side substrate and the counter substrate,
The element side terminal group is a method of manufacturing a liquid crystal display device that is divided into two groups that are independently driven,
A substrate forming step of forming the element side substrate by forming the pixel electrode, the signal wiring, the element side terminal group, and the switching element, and dividing the mother glass along a rectangular substrate dividing line with respect to the mother glass,
A cell forming step of forming a liquid crystal display cell by enclosing the element side substrate to the counter substrate and enclosing a liquid crystal between the substrates,
The above substrate forming process
A short ring for electrically connecting element side terminal groups for each group is formed outside the signal wiring terminals and inside the substrate dividing line along the opposing substrate dividing lines. Process,
Short-circuit wiring that electrically short-circuits the short rings of each group so that the whole is arranged inside the substrate dividing line and partly located outside the counter substrate in the cell formation process. Along one side region of the liquid crystal display cell that is on the extension line of the ring and that is on one side of the other pair of two sides facing each other on the substrate cutting line, and on which the element side substrate and the counter substrate face each other A method of manufacturing a liquid crystal display device, comprising: a step of forming a short circuit wiring so as to pass through. A plurality of pixel electrodes arranged in a matrix, a plurality of signal lines formed between the pixel electrodes, an element side terminal group for supplying an electric signal, and a switching element for connecting the pixel electrodes and the signal lines A method for manufacturing a liquid crystal display device for manufacturing an element-side substrate of a liquid crystal display cell by forming a substrate on a mother glass,
On the mother glass
A first element-side terminal group;
A second element side terminal group formed at a position that is finally electrically independent from the first element side terminal and is opposed to the first element side terminal group across the pixel region;
Anodizing wiring for energizing the lower electrode of the switching element is disposed from the first element side terminal group and the second element side terminal group on the mother glass, and
On the mother glass in the region that becomes the liquid crystal display cell, a short-circuit wiring that extends from the first element-side terminal group to the second element-side terminal group and does not depend on driving of the liquid crystal display is separated from the anodizing wiring. In addition, the liquid crystal is formed of the same material as the anodizing wiring, and finally the anodizing wiring, the first element side terminal group, the second element side terminal group, and the short circuit wiring are cut from each other. Manufacturing method of display device.   4. The method of manufacturing a liquid crystal display device according to claim 1, wherein the switching element is a two-terminal nonlinear element.   4. The method of manufacturing a liquid crystal display device according to claim 1, wherein a part of the short-circuit wiring is formed on an end face of the substrate on an extension line of the short ring and in the vicinity of a dividing line of the liquid crystal display cell.

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