JP2005138213A - Grinding device for display panel, grinding method therefor, and manufacturing method for plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding device for a display panel shortening the time for grinding, preventing local wear of a grinding wheel, and extending the service life of the grinding wheel, a grinding method therefor, a manufacturing method for a plasma display panel, and a manufacturing method for a plasma display device, in a grinding process of the display panel. <P>SOLUTION: The display panel grinding device 10 is provided with a plurality of grinding wheel 21, 22, 23, a rotating mechanism rotating the plurality of grinding wheels 21, 22, 23, and a moving mechanism moving the plurality of grinding wheel 21, 22, 23 in a first direction X. This plurality of grinding wheel 21, 22, 23 process the display panel 40 formed of a first substrate 41 and a second substrate 42 which overlap each other forming steps. At that time, the plurality of grinding wheel 21, 22, 23 are rotated by the rotating mechanism to grind each of a plurality of edge parts E1, E2, E3 running in the first direction X of the display panel 40 as it is moved in the direction X by the moving mechanism. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus and method for processing a substrate constituting a display panel, and more particularly to an apparatus and method for polishing an edge portion of a substrate constituting a display panel.

  In order to form a display panel, for example, a plasma display panel (hereinafter referred to as PDP; Plasma Display Panel), a glass substrate is used. In the manufacturing process of the PDP, a large patterned glass plate may be divided to form individual glass substrates. The edge part (end part) of the glass substrate after division | segmentation is sharp, and it is necessary to grind the edge part in order to prevent an edge part chipping and to ensure the safety at the time of handling.

  FIG. 1 is a plan view showing a conventional configuration when polishing an edge portion of a substrate constituting a PDP. FIG. 1 shows the positional relationship between the PDP and the polishing grindstone when the edge portion is polished. A PDP 1 that is a member to be polished includes a front substrate 2 and a back substrate 3. The two substrates are bonded together via a spacer, and a rare gas is sealed in a region between the two substrates. Here, the front substrate 2 and the rear substrate 3 are bonded together so that a terminal region is secured at the peripheral edge of the PDP 1. That is, the front substrate 2 and the rear substrate 3 are different in size or in shape. As a result, a margin structure for forming electrode terminals and the like is secured on the four sides of the PDP 1 and a step structure is formed at the same time. An edge portion corresponding to the step structure is defined as a step portion. The other edge part, that is, the edge part existing on the outermost part of the PDP 1 is defined as the peripheral part.

  The PDP 1 is transferred to the polishing apparatus by a robot hand or the like and set on the table in the polishing area. Here, the PDP 1 is positioned in the polishing region and held horizontally on the table by a vacuum suction mechanism or the like. Thereafter, by using the grindstone 4, any one side of the PDP 1 is polished. The polishing apparatus includes an X-axis moving mechanism so that the grindstone 4 can move along the extending direction of the side to be polished (X-axis direction in FIG. 1). In addition, the polishing apparatus includes a Z-axis moving mechanism and a position so that the position in the vertical direction (Z-axis direction in FIG. 1) of the grindstone 4 and the position in the front-back direction (Y-axis direction in FIG. Each is provided with a Y-axis moving mechanism.

  2A and 2B are side views of the configuration shown in FIG. The grindstone 4 has a central polishing surface 5, an upper polishing surface 6, and a lower polishing surface 7. The central polishing surface 5 is formed in a valley shape on the side surface of the grindstone 4 and is used for polishing the peripheral edge of the PDP 1. Further, the upper polishing surface 6 and the lower polishing surface 7 are formed such that the side surface of the grindstone 4 is wavy. The upper polishing surface 6 and the lower polishing surface 7 are used for polishing the step portion of the PDP 1. That is, the grindstone 4 has an integral structure so that various edge portions can be polished (hereinafter, the grindstone 4 is referred to as the integral grindstone 4). The rotation axis of the integrated grindstone 4 is along a direction perpendicular to the display surface of the PDP 1, and the integral grindstone 4 always rotates in a plane parallel to the display surface. Such an integrated grindstone 4 is described, for example, in Patent Document 1 (FIG. 14 or FIG. 15).

  Next, a conventional method for polishing the edge portion of the PDP 1 will be described with reference to FIGS. 1, 2A, and 2B. First, as shown in FIG. 1, the PDP 1 is positioned so that the direction in which the integrated grindstone 4 moves (X-axis direction) and the side to be polished are parallel. The PDP 1 is held horizontally on a rotatable table by a vacuum suction mechanism or the like. At this time, the integrated grindstone 4 is retracted to a position where it does not come into contact with the PDP 1. Next, by adjusting the position of the integrated grindstone 4 using the Y-axis moving mechanism and the Z-axis moving mechanism, as shown in FIG. 2A, the edge portions E1 and E2 (PDP1 of the PDP1) of the front substrate 2 to be polished are obtained. Peripheral edge) and the central polishing surface 5 of the integrated grindstone 4 are brought into contact with each other. Thereafter, the integrated grindstone 4 is rotated at a set speed determined according to various conditions, and the integral grindstone 4 is moved in the X-axis direction as shown in FIG. 1, whereby the edge portions E1 and E2 are polished.

  After the polishing of the peripheral edge portion of the PDP 1 is completed, the edge portion E3 (the step portion of the PDP 1) of the back substrate 3 is subsequently polished. By adjusting the position of the integrated grindstone 4 using the Y-axis moving mechanism and the Z-axis moving mechanism, as shown in FIG. 2B, the upper polishing of the edge portion E3 of the back substrate 3 to be polished and the integrated grindstone 4 is polished. The surface 6 is brought into contact. Thereafter, the edge E3 is polished by moving the integrated grindstone 4 in the direction opposite to the previous step (−X axis direction). Thus, in order to grind the peripheral part and step part in one side of PDP1, it is necessary to perform two processes.

  After the polishing of the peripheral edge portion and the step portion of one side of the PDP 1 is completed, the table on which the PDP 1 is placed rotates 90 degrees. Thereafter, by moving the integrated grindstone 4 in the same manner as described above, the peripheral edge and the stepped portion are polished with respect to another side. However, at this time, the peripheral portion belongs to the back substrate 3 and the step portion belongs to the front substrate 2. Further, the stepped portion is polished by the lower polishing surface 7 of the integrated grindstone 4. Thereafter, the same operation is repeated, and the polishing of the edge portion of one PDP 1 is completed.

JP-A-8-197402

  An object of the present invention is to provide a display panel polishing apparatus, a polishing method thereof, a plasma display panel manufacturing method, and a plasma display apparatus manufacturing method capable of reducing the time required for the polishing process of the display panel. .

  Another object of the present invention is to provide a display panel polishing apparatus, a polishing method thereof, and a plasma display panel manufacturing method capable of preventing local wear of the grindstone in the polishing process of the display panel and extending the service life of the grindstone. And a method of manufacturing a plasma display device.

  Still another object of the present invention is to provide a display panel polishing apparatus, a polishing method thereof, a plasma display panel manufacturing method, and a plasma display apparatus manufacturing method capable of stabilizing the amount of polishing when the display panel is polished. There is to do.

  Still another object of the present invention is to provide a display panel polishing apparatus, a polishing method thereof, and a plasma display panel manufacturing method capable of simplifying the movement control mechanism of the grindstone and improving the controllability of the grindstone in the display panel polishing process. And a method of manufacturing a plasma display device.

  [Means for Solving the Problems] will be described below using the numbers and symbols used in [Best Mode for Carrying Out the Invention]. These numbers and symbols are added in parentheses in order to clarify the correspondence between the description of [Claims] and [Best Mode for Carrying Out the Invention]. However, these numbers and symbols should not be used for the interpretation of the technical scope of the invention described in [Claims].

  A polishing apparatus (10) for a display panel (40) of the present invention includes a plurality of grindstones (21, 22, 23), a rotation mechanism for rotating each of the plurality of grindstones (21, 22, 23), and a plurality of grindstones. And a moving mechanism for moving (21, 22, 23) in the first direction (X). The plurality of grindstones (21, 22, 23) process the display panel (40) in which the first substrate (41, 42) and the second substrate (41, 42) are overlapped so as to have a step. At that time, the plurality of grindstones (21, 22, 23) rotate along the first direction (X) of the display panel (40) by rotating by the rotation mechanism and moving in the first direction (X) by the moving mechanism. The plurality of edge portions (E1 to E3, E4 to E6) are polished. Each of the plurality of grindstones (21, 22, 23) rotates on a plane parallel to the arrangement plane (XY) on which the display panel (40) is arranged.

  The first substrate (41, 42) has the first edge portions (E1, E5) and the second edge portions (E2, E6) along the first direction (X) as a plurality of edge portions (E1-E6). Have. The 2nd board | substrate (41, 42) has the 3rd edge part (E3, E4) along the 1st direction (X) corresponding to a level | step difference as several edge part (E1-E6). At this time, the plurality of grindstones (21, 22, 23) are a first grindstone (21) that grinds the first edge portion (E1, E5) and a second grindstone that grinds the second edge portion (E2, E6). (22) and a third grindstone (23) for polishing the third edge portion (E3, E4).

  In the polishing apparatus (10) of the display panel (40) of the present invention, at least one (23) of the first grindstone (21), the second grindstone (22), and the third grindstone (23) is polished on two sides. Surfaces (33, 34) are provided. The two polished surfaces (33, 34) are formed symmetrically with respect to a plane parallel to the arrangement surface (XY).

  In the polishing apparatus (10) of the display panel (40) of the present invention, the first grindstone (21) includes a first polishing surface (31). The second grindstone (22) includes a second polishing surface (32). The third grindstone (23) includes a third polishing surface (33) and a fourth polishing surface (34). The first polishing surface (31) and the second polishing surface (32) are formed symmetrically with respect to a plane parallel to the arrangement surface (XY). The third polishing surface (33) and the fourth polishing surface (34) are formed symmetrically with respect to a plane parallel to the arrangement surface (XY).

  In the polishing apparatus (10) of the display panel (40) of the present invention, the first grindstone (21) includes a first polishing surface (31). The second grindstone (23) may include a third polishing surface (33) and a fourth polishing surface (34). The third grindstone (22) includes a second polishing surface (32). The first polishing surface (31) and the second polishing surface (32) are formed symmetrically with respect to a plane parallel to the arrangement surface (XY). The third polishing surface (33) and the fourth polishing surface (34) are formed symmetrically with respect to a plane parallel to the arrangement surface (XY).

  In the polishing apparatus (10) of the display panel (40) of the present invention, each of the first polishing surface (31), the second polishing surface (32), the third polishing surface (33), and the fourth polishing surface (34) The angle formed by the placement surface (XY) is approximately 45 degrees.

  The polishing apparatus (10) of the display panel (40) of the present invention further includes a grindstone unit (11) that supports a plurality of grindstones (21, 22, 23) so as to be movable. At this time, the plurality of grindstones (21, 22, 23) are arranged substantially along the first direction (X) of the grindstone unit (11). When processing the display panel (40), the grindstone unit (11) is disposed so as to cover the display panel (40). Moreover, a some grindstone (21, 22, 23) is arrange | positioned so that a display panel (40) may be pinched | interposed. The grindstone unit (11) moves in the first direction (X).

  In the present invention, the display panel (40) may be a plasma display panel (130).

  The method for polishing the display panel (40) of the present invention is a method for polishing the display panel (40) in which the front substrate (41) and the rear substrate (42) having different shapes are arranged to face each other. This polishing method is a first polishing in which the stepped portion (E3) of the front substrate (41) and the back substrate (42) and the peripheral portions (E1, E2) of the front substrate (41) and the back substrate (42) are simultaneously polished. Process. In the first polishing step, a front substrate (41) and a rear substrate (42) corresponding to two opposing sides of the display panel (40) when viewed from a direction perpendicular to the display surface (XY) of the display panel (40). ) Are simultaneously polished with a grindstone (21, 22, 23) that moves relatively in the direction (X) in which the two sides extend (E3) and the peripheral edge (E1, E2).

  The polishing method of the display panel (40) according to the present invention includes a step of rotating the display panel (40) in a plane (XY) parallel to the display surface after polishing of the two sides, and a display surface of the display panel (40). The step portion (E4) and the peripheral portion (E5, E6) of the front substrate (41) and the rear substrate (42) corresponding to the other two opposite sides of the display panel (40) when viewed from the direction perpendicular to And a second polishing step of simultaneously polishing with the grindstone (21, 22, 23) moving relatively in the extending direction (X) of the other two sides. In the first polishing step and the second polishing step, the polishing grindstones (21, 22, 23) of the stepped portions (E3, E4) and the polishing grindstones (21, 22, 5) of the peripheral portions (E1, E2, E5, E6) 23) The sequence is different.

  In the polishing method for the display panel (40) of the present invention, the grindstone (21) rotates the end face (E1, E2, E3) of the display panel (40) in a plane parallel to the display face (XY) of the display panel (40). , 22, 23), a step of moving the grindstone (21, 22, 23) in a direction (X) perpendicular to a plane parallel to the display surface (XY) of the display panel (40), and after the movement A grindstone (21, 22, 23) that rotates an end surface (E4, E5, E6) of a display panel (40) or a different display panel (40) in a plane parallel to the display surface (XY) of the display panel (40). And polishing.

  The method for polishing the display panel (40) of the present invention is a method for polishing the display panel (40) in which the first substrate (41, 42) and the second substrate (41, 42) are overlapped so as to have a step. In this polishing method, (a) a plurality of grindstones (21, 22, 23) that rotate a plurality of edge portions (E1, E2, E3) along the first direction (X) of the display panel (40). And polishing in a first direction (X).

In the display panel (40) polishing method of the present invention, the plurality of grindstones (21, 22, 23) are supported by the grindstone unit (11) so as to be movable. In the polishing step (a), (a-1) the plurality of grindstones (21, 22, 23) are brought into contact with the plurality of edge portions (E1, E2, E3) along the first direction (X). And (a-2) a step of moving the grindstone unit (11) in the first direction (X). This step (a-1) is preferably performed such that the display panel (40) is sandwiched between the plurality of grindstones (21, 22, 23).

  The display panel (40) polishing method of the present invention includes (b) a step of rotating the display panel (40) within a plane (XY) on which the display panel (40) is disposed, and (c) the display panel (40 ) Aligning the plurality of edge portions (E4, E5, E6) along the second direction (Y) along the first direction (X), and (d) along the second direction (Y). And further polishing each of the plurality of edge portions (E4, E5, E6) using the plurality of grindstones (21, 22, 23). The first direction (X) and the second direction (Y) are substantially perpendicular.

  The first substrate (41) has a first edge portion (E1) and a second edge portion (E2) along the first direction (X). The second substrate (42) has a third edge portion (E3) along the first direction (X) corresponding to the step. The first substrate (41) has a fourth edge portion (E4) along the second direction (Y) corresponding to the step. The second substrate (42) has a fifth edge portion (E5) and a sixth edge portion (E6) along the second direction (Y).

  In the polishing method for the display panel (40) of the present invention, the plurality of grindstones (21, 22, 23) include a first grindstone (21), a second grindstone (22), and a third grindstone (23). . In the step (a) for polishing, the first grindstone (21) polishes the first edge portion (E1). The second grindstone (22, 23) polishes the second edge portion (E2). The third grindstone (23, 22) polishes the third edge portion (E3). In the step (d), the first grindstone (21) polishes the fifth edge portion (E5). The second grindstone (32) polishes the sixth edge portion (E6). The third grindstone (23) polishes the fourth edge portion (E4). The first grindstone (21) may polish the fourth edge portion (E4). The second grindstone (23) may polish the fifth edge portion (E5). The third grindstone (22) may polish the sixth edge portion (E6).

  The manufacturing method of the plasma display panel (130) of the present invention includes the polishing method of the display panel (40).

  The method for manufacturing a plasma display device (150) according to the present invention includes a first process for manufacturing a plasma display panel (130), a circuit for driving the plasma display panel (130), and a module ( 152) and a third process of converting the format of the image signals (162, 163) and electrically connecting the interface (151) to be transmitted to the module (152) to the module (152). . In the first step of the manufacturing method, the manufacturing method of the plasma display panel (130) is performed.

  According to the display panel polishing apparatus, the polishing method, the plasma display panel manufacturing method, and the plasma display device manufacturing method according to the present invention, the time required for the polishing process of the display panel can be shortened.

  According to the display panel polishing apparatus, the polishing method thereof, the plasma display panel manufacturing method, and the plasma display apparatus manufacturing method according to the present invention, it is possible to prevent local abrasion of the grindstone in the polishing process of the display panel. The service life can be extended.

  According to the display panel polishing apparatus, the polishing method, the plasma display panel manufacturing method, and the plasma display apparatus manufacturing method according to the present invention, the polishing amount can be stabilized when the display panel is polished.

  According to the display panel polishing apparatus, the polishing method thereof, the plasma display panel manufacturing method, and the plasma display apparatus manufacturing method according to the present invention, the grindstone movement control mechanism is simplified, and the grindstone is controlled in the display panel polishing process. Can be improved.

  A display panel polishing apparatus, a display panel polishing method, a plasma display panel manufacturing method, and a plasma display device manufacturing method according to the present invention will be described with reference to the accompanying drawings.

  FIG. 3 is a plan view showing the configuration of the display panel polishing apparatus according to the embodiment of the present invention. As shown in FIG. 3, the polishing apparatus 10 includes a grindstone unit 11 and a plurality of grindstones 21, 22, and 23. The plurality of grindstones 21, 22, and 23 are supported by the grindstone unit 11 via rotating shaft rods, and are configured to be freely movable in directions along the Y axis and Z axis in the drawing. The movement along the Y axis and the Z axis is achieved by a Y axis movement mechanism and a Z axis movement mechanism (not shown). Further, the grindstone unit 11 is configured to move in a direction along the X axis by using an X axis moving mechanism (not shown). Here, the movement along the X-axis is performed as a whole including the plurality of grindstones 21, 22, and 23. Further, as the X-axis moving mechanism, a rail and a moving part disposed on the side part of the grindstone unit 11 are exemplified.

  The plurality of grindstones 21, 22, and 23 are arranged substantially along the X-axis direction. Here, the positions of the plurality of grindstones 21, 22, and 23 are finely adjusted along the Y-axis and the Z-axis during the polishing process described later, so that the plurality of grindstones 21, 22, and 23 are perfectly aligned. Unaligned situations can also occur. The plurality of grindstones 21, 22, and 23 may be arranged at equal intervals. In addition, as shown in FIG. 3, it is more preferable that the plurality of grindstones 21, 22, and 23 are arranged in two rows in the direction along the X-axis direction. At this time, since the display panel as the object to be processed is sandwiched between the plurality of grindstones 21, 22, and 23 as will be described later, it is possible to polish two opposing sides of the display panel in one polishing process. Become.

  In the embodiment of the present invention, the plurality of grindstones include a first shape grindstone 21, a second shape grindstone 22, and a third shape grindstone 23. 4A, 4B, and 4C are side views showing the structures of the first shape grindstone 21, the second shape grindstone 22, and the third shape grindstone 23, respectively. Each grindstone has a disk-like structure and is arranged on a plane parallel to the XY plane in the drawing. Here, the XY plane may be a horizontal plane. At this time, the + Z-axis direction indicates a vertically upward direction.

  As shown in FIG. 4A, the first-shaped grindstone 21 has a rotation axis a1, and rotates on a plane parallel to the XY plane by a rotation mechanism (not shown). The first shape grindstone 21 is supported by the grindstone unit 11 via the rotation axis a1 so as to be movable in a direction along the Y axis and the Z axis. A first polishing surface 31 is formed on the side portion of the first shape grindstone 21. The first polishing surface 31 is formed so as to face obliquely downward, and the first shape grindstone 21 is used to polish an edge portion of the substrate facing obliquely upward. In order to polish the edge portion uniformly, the angle formed by the first polishing surface 31 and the XY plane is preferably 45 degrees.

  As shown in FIG. 4B, the second-shaped grindstone 22 has a rotation axis a2, and rotates on a plane parallel to the XY plane by a rotation mechanism (not shown). The second shape grindstone 22 is supported by the grindstone unit 11 via the rotation axis a2 so as to be movable in the direction along the Y axis and the Z axis. A second polishing surface 32 is formed on the side portion of the second shaped grindstone 22. The second polishing surface 32 is formed so as to face obliquely upward, and the second shaped grindstone 22 is used to polish the edge portion of the substrate facing obliquely downward. In order to uniformly polish the edge portion, the angle formed by the second polishing surface 32 and the XY plane is preferably 45 degrees. The first polishing surface 31 and the second polishing surface 32 are preferably formed symmetrically with respect to the XY plane.

  As shown in FIG. 4C, the third-shaped grindstone 23 has a rotation axis a3, and rotates on a plane parallel to the XY plane by a rotation mechanism (not shown). The third shape grindstone 23 is supported by the grindstone unit 11 via the rotation axis a3 so as to be movable in a direction along the Y axis and the Z axis. The third shape grindstone 23 has a grinding surface formed in a mountain shape or at a right angle. That is, a third polishing surface 33 facing obliquely upward and a fourth polishing surface 34 facing obliquely downward are formed on the side portion of the third shape grindstone 23. That is, the third shape grindstone 23 is used to polish the edge portion of the substrate that faces obliquely upward or obliquely downward. In order to polish the edge portion uniformly, the angle formed by the third polishing surface 33 and the XY surface and the fourth polishing surface 34 and the XY surface is preferably 45 degrees. The third polishing surface 33 and the fourth polishing surface 34 are preferably formed symmetrically with respect to the XY plane.

  In FIG. 3, the second shape grindstone 22 is arranged between the first shape grindstone 21 and the third shape grindstone 23, but the arrangement order of the plurality of grindstones 21, 22, 23 is arbitrary.

  FIG. 5 is a plan view showing a configuration when the edge portion of the display panel is polished in the embodiment according to the present invention. The display panel 40 that is a member to be polished includes a front substrate 41 and a back substrate 42. The front substrate 41 and the back substrate 42 have a rectangular shape with a vertical and horizontal length of about 500 to 1500 mm. The two substrates are bonded together via a spacer, and a rare gas is sealed in a region between the two substrates.

Further, as shown in FIG. 5, the front substrate 41 and the rear substrate 42 are overlapped (attached) so that a terminal region is secured at the peripheral portion of the display panel 40. That is, the front substrate 41 and the rear substrate 42 have different sizes or different shapes. Thus, a margin structure for forming electrode terminals and the like is secured on the four sides of the display panel 40, and a step structure is formed at the same time. The edge portion corresponding to the step in the step structure is defined as a step portion. The other edge part, that is, the edge part existing on the outermost part of the display panel 40 is defined as the peripheral part. Note that the width of the margin structure is, for example, about 6 to 8 mm.

  Such a display panel 40 is arranged in parallel to the XY plane in FIG. Here, it is assumed that the polishing step is performed on a plurality of edge portions along the X axis. In the state shown in FIG. 5, among the plurality of edge portions to be polished, the peripheral edge portion belongs to the front substrate 41, and the step portion belongs to the rear substrate 42. When polishing is performed from the other side surface of the display panel 40, the peripheral edge portion belongs to the back substrate 42 and the step portion belongs to the front substrate 41. As a specific arrangement method, the display panel 40 is transferred onto the table in the polishing work area by a robot hand or the like, and positioned so that the side surface to be polished is parallel to the X axis. This positioning is performed by using an outside width alignment positioning or marker recognition alignment not shown. The display panel 40 is horizontally held on a rotatable table by a vacuum suction mechanism or the like.

  On the other hand, the polishing apparatus 10 includes the X-axis movement mechanism as described above, and retracts to a predetermined position in the X-axis direction so as not to contact the display panel 40 when the display panel 40 is set. After the setting of the display panel 40 is completed, the polishing apparatus 10 moves to a predetermined polishing start position. At this time, as shown in FIG. 5, the above-described grindstone unit 11 is disposed so as to cover the display panel 40, and a plurality of grindstones 21, 22, and 23 are opposed to two side surfaces along the X axis of the display panel 40 ( 2 sides). Three types of grindstones are used as one set for polishing one side. Thereafter, the position of each of the plurality of grindstones 21, 22, 23 is adjusted by using the Y-axis moving mechanism and the Z-axis moving mechanism.

  FIG. 6A is a side view of the configuration shown in FIG. The position of the first-shaped grindstone 21 is adjusted such that the obliquely downward first polishing surface 31 is in contact with the obliquely upward edge portion E1 (peripheral portion) of the front substrate 41. Further, the position of the second-shaped grindstone 22 is adjusted so that the diagonally upward second polishing surface 32 is in contact with the diagonally downward edge E2 (peripheral edge) of the front substrate 41. Further, the position of the third-shaped grindstone 23 is adjusted so that the obliquely upward third polishing surface 33 is in contact with the obliquely downward edge portion E3 (stepped portion) of the back substrate 42. The other grindstones 21, 22, and 23 are similarly arranged on the other opposing side surface of the display panel 40.

  Or the some grindstones 21, 22, and 23 may be arrange | positioned as FIG. 6B shows. 6B is also a side view of the configuration shown in FIG. The position of the first-shaped grindstone 21 is adjusted such that the obliquely downward first polishing surface 31 is in contact with the obliquely upward edge portion E1 (peripheral portion) of the front substrate 41. Further, the position of the third-shaped grindstone 23 is adjusted so that the obliquely upward third polishing surface 33 is in contact with the obliquely downward edge portion E2 (peripheral portion) of the front substrate 41. Further, the position of the second-shaped grindstone 22 is adjusted so that the obliquely upward second polishing surface 32 is in contact with the obliquely downward edge portion E3 (stepped portion) of the back substrate. The other grindstones 21, 22, and 23 are similarly arranged on the other opposing side surface of the display panel 40. 6A and 6B are plan views, and the actual positions in the depth direction of the plurality of grindstones 21, 22, and 23 are different from each other (see FIG. 5).

  Thereafter, the plurality of grindstones 21, 22, and 23 are rotated at a set speed determined according to various conditions, and the grindstone unit 11 is moved in the X-axis direction as shown in FIG. E3 is polished. That is, each of the first, second, and third shaped grindstones 21, 22, and 23 polishes each of the plurality of edge portions E1, E2, and E3 (or E1, E3, and E2) simultaneously (in a single step). To do. As shown in FIG. 5, when the plurality of grindstones 21, 22, and 23 are arranged so as to sandwich the two opposite sides of the display panel 40, the plurality of edge portions E <b> 1, E <b> 2, and E <b> 3 on the two sides are Polished at the same time.

  As described above, according to the polishing apparatus 10 according to the present invention, the plurality of edge portions E1, E2, and E3 along the X direction of the display panel 40 are polished in a single process. It can be shortened. The plurality of grindstones 21, 22, and 23 do not need to be separately controlled and moved, and can be easily moved at the same speed by moving the entire grindstone unit 11 in the X direction. That is, the movement control mechanism of the grindstone is simplified, and the controllability of the grindstone in the polishing process is improved.

  Subsequently, the edge portions for the remaining two sides of the display panel 40 are polished. FIG. 7 is a plan view showing a configuration when the remaining edge portion of the display panel 40 is polished in the embodiment according to the present invention. After the pre-process is completed, the table on which the display panel 40 is placed is rotated by 90 degrees, and the remaining side surface to be polished is positioned so as to be parallel to the X axis. This positioning is performed by using an outside width alignment positioning or marker recognition alignment not shown. At this time, the polishing apparatus 10 is retracted to a predetermined position in the X-axis direction so as not to contact the rotating display panel 40.

  In the state shown in FIG. 7, contrary to the state shown in FIG. 5, the peripheral portion of the plurality of edge portions to be polished belongs to the back substrate 42, and the step portion belongs to the front substrate 41. The arrangement of the plurality of grindstones 21, 22, and 23 is changed so as to correspond to this configuration. That is, by using the Y-axis movement mechanism and the Z-axis movement mechanism, the positions of the plurality of grindstones 21, 22, and 23 are adjusted again.

  FIG. 8A is a side view of the configuration shown in FIG. The position of the first-shaped grindstone 21 is adjusted such that the obliquely downward first polishing surface 31 is in contact with the obliquely upward edge portion E5 (peripheral portion) of the back substrate. In addition, the position of the second-shaped grindstone 22 is adjusted so that the diagonally upward second polishing surface 32 contacts the diagonally downward edge E6 (peripheral edge) of the back substrate 42. Further, the position of the third-shaped grindstone 23 is adjusted so that the fourth polishing surface 34 obliquely downward contacts the obliquely upward edge E4 (stepped portion) of the front substrate 41. The other grindstones 21, 22, and 23 are similarly arranged on the other opposing side surface of the display panel 40.

  Or the some grindstones 21, 22, and 23 may be arrange | positioned as FIG. 8B shows. FIG. 8B is also a side view of the configuration shown in FIG. The position of the first-shaped grindstone 21 is adjusted such that the obliquely downward first polishing surface 31 is in contact with the obliquely upward edge portion E4 (stepped portion) of the front substrate 41. Further, the position of the third-shaped grindstone 23 is adjusted so that the obliquely downward fourth polishing surface 34 contacts the obliquely upward edge portion E5 (peripheral portion) of the back substrate 42. Further, the position of the second-shaped grindstone 22 is adjusted so that the diagonally upward second polishing surface 32 contacts the diagonally downward edge E6 (peripheral edge) of the back substrate 42. The other grindstones 21, 22, and 23 are similarly arranged on the other opposing side surface of the display panel 40.

  That is, the plurality of grindstones 21, 22, and 23 may be changed from the arrangement shown in FIG. 6A to the arrangement shown in FIG. 8A or may be changed to the arrangement shown in FIG. 8B. Or the some grindstones 21, 22, and 23 may be changed into the arrangement | positioning shown by FIG. 8A from the arrangement | positioning shown by FIG. 6B, and may be changed to the arrangement | positioning shown by FIG. 8B. Moreover, it is sufficient that at least one of the plurality of grindstones 21, 22, and 23 has the structure shown in FIG. 4C. The plurality of grindstones 21, 22, and 23 may all have the same structure as the third shape grindstone 23. Even in such a case, the same effect as the present embodiment can be obtained.

  Thereafter, the plurality of grindstones 21, 22, 23 are rotated at a set speed determined according to various conditions, and the grindstone unit 11 is moved in the opposite direction (−X axis direction) to the previous step as shown in FIG. The plurality of edge portions E4, E5, E6 are polished. That is, each of the first, second, and third shaped grindstones 21, 22, and 23 polishes each of the plurality of edge portions E5, E6, and E4 (or E4, E6, and E5) simultaneously (in a single step). To do. In this way, the polishing of the edge portion of one display panel 40 is completed.

  In summary, the display panel polishing method according to the present invention includes the following steps.

  (1) The display panel 40 is arranged on the XY plane so that the side to be polished is parallel to the X axis (see FIG. 5).

  (2) The arrangement of the plurality of grindstones 21, 22, 23 is set to the Y axis so that the plurality of grindstones 21, 22, 23 are in contact with the plurality of edge portions E1, E2, E3 along the X axis of the display panel 40. Adjustment is performed using the moving mechanism and the Z-axis moving mechanism (see FIG. 6A or FIG. 6B).

  (3) The grindstone unit 11 is moved in the X-axis direction, and the plurality of edge portions E1, E2, and E3 are simultaneously polished by the plural grindstones 21, 22, and 23 (see FIG. 5).

  (4) The polishing apparatus 10 is retracted in the X axis direction.

  (5) The display panel 40 is rotated 90 degrees in the XY plane (see FIG. 7).

  (6) The arrangement of the plurality of grindstones 21, 22, 23 is arranged in the Y axis so that the plurality of grindstones 21, 22, 23 are in contact with the plurality of edge portions E4, E5, E6 along the X axis of the display panel 40. It changes using a moving mechanism and a Z-axis moving mechanism (refer FIG. 8A or FIG. 8B).

  (7) The grindstone unit 11 is moved in the −X-axis direction, and the plurality of edge portions E4, E5, E6 are simultaneously polished by the plurality of grindstones 21, 22, 23 (see FIG. 7).

  (8) The polishing of the edge portion of one display panel 40 is completed.

  As described above, according to the display panel polishing apparatus 10 and the polishing method according to the present invention, each of the plurality of grindstones 21, 22, 23 has a plurality of edge portions along the X direction of the display panel 40. Each of (E1-E3, E4-E6) is polished in a single step. Further, the plurality of grindstones 21, 22, and 23 are arranged in two rows on the grindstone unit 11, and the edge portions of two opposite sides (two side surfaces) parallel to the X direction of the display panel 40 are polished in one step. Is possible. As in the conventional example shown in FIG. 1, two steps are not required to polish one side of the display panel. Therefore, the time required for the polishing process of the display panel 40 is shortened.

  Further, the plurality of grindstones 21, 22, and 23 are supported by the grindstone unit 11 without being completely independent. That is, it is not necessary to control the plurality of grindstones 21, 22, and 23 separately, and the plurality of grindstones 21, 22, and 23 are moved at the same speed by moving the entire grindstone unit 11 in the X direction using the X-axis moving mechanism. It is possible to move in the X direction. Therefore, the movement control mechanism of the plurality of grindstones 21, 22, 23 is simplified, and the controllability of the plurality of grindstones 21, 22, 23 in the polishing process is improved.

  Further, in the prior art shown in FIG. 2A, the peripheral edge portions E1 and E2 of the substrate are always in contact with the same point of the central polishing surface 5 of the integrated grindstone 4. In the polishing process of a display panel, for example, a plasma display panel, the glass substrate has a thickness of about 3 mm, and the glass substrate is polished to about 0.5 mm. On the other hand, a grindstone having a thickness of about 5 to 10 mm is used. That is, in the case of the prior art, the integrated grindstone 4 is always in contact with the glass substrate only in the range of about 0.5 mm. Therefore, the wear of the grindstone is accelerated and the life of the grindstone is shortened.

  However, according to the polishing apparatus 10 and the polishing method of the present invention, the plurality of grindstones 21, 22, and 23 are formed separately, and the edge portions (E1 to E6) of the substrate within the thickness range of the grindstone. It is possible to freely change the contact position with. That is, it is possible to change the position where the polishing surface (31 to 34) of the grindstone and the edge portions (E1 to E6) of the substrate are in contact each time. For example, the first-shaped grindstone 21 is finely adjusted using a Y-axis moving mechanism and a Z-axis moving mechanism, so that one of the edge portions (E1 to E6) of the substrate is different from the first polishing surface 31. It is possible to touch every time. Accordingly, local abrasion of the grindstone in the display panel polishing process is prevented. Further, the service life of the grindstone can be extended by making the amount of wear of the grindstone uniform. Furthermore, local deformation of the polished surface is prevented, and the amount of polishing of the edge portion in the polishing process can be stabilized.

Moreover, it is preferable that the angle | corner which the some grindstone 21, 22, 23 and the surface (XY surface) by which a display panel is arrange | positioned makes is 45 degree | times (refer FIG. 6A, FIG. 6B, FIG. 8A, FIG. 8B). . At this time, the edge portion in the polishing process is uniformly polished. Moreover, when finely adjusting the position of the grindstone to prevent local wear of the grindstone, the ratio of the amount of movement by the Y-axis movement mechanism and the Z-axis movement mechanism can be made simple one-to-one. .

  The display panel polishing apparatus 10 and the polishing method as described above can be applied to a plasma display panel (PDP), a plasma display apparatus, and a plasma television.

  FIG. 9 illustrates a plasma display panel 130 processed by the polishing method according to the present invention. The plasma display panel 130 is formed of a front structure board 131 (front substrate 41) and a rear structure board 132 (back substrate 42). The front structural plate 131 includes a first transparent glass substrate 133, a transparent dielectric layer 134 bonded to the back side of the first transparent glass substrate 133, and a surface protective layer 135 bonded to the back side of the transparent dielectric layer 134. Is formed. A scan electrode 136 and a sustain electrode 137 are disposed between the first transparent glass substrate 133 and the transparent dielectric layer 134. Scan electrode 136 and sustain electrode 137 are arranged in parallel to each other. Scan electrode 136 and sustain electrode 137 are each formed of a transparent electrode and a bus electrode. The transparent dielectric layer 134 covers the scan electrode 136 and the sustain electrode 137.

  The back structure board 132 includes a second transparent glass substrate 138, a white dielectric layer 139 bonded to the front side of the second transparent glass substrate 138, and a plurality of barrier ribs 141 bonded to the front side of the white dielectric layer 139. Formed from. The partition wall 141 partitions display cells. A data electrode 142 is disposed between the second transparent glass substrate 138 and the white dielectric layer 139. The data electrode 142 is orthogonal to the scan electrode 136 and the sustain electrode 137. The white dielectric layer 139 covers the data electrode 142. On the side surface of the partition wall 141 and the front surface of the white dielectric layer 139, a phosphor layer 143 that converts ultraviolet rays generated by the discharge of the discharge gas into visible light is formed. The phosphor layer 143 is coated in three primary colors R, G, and B for each cell.

  The front structural plate 131 and the rear structural plate 132 are assembled while being fixed to each other with a gap provided between the front structural plate 131 and the rear structural plate 132. The width of the gap is designed to be about 100 μm. The periphery of the side surfaces of the front structural plate 131 and the rear structural plate 132 is hermetically sealed with a sealing material, and the gap is formed in a sealed space. The sealed space is filled with helium, neon, xenon, or a mixed gas containing these. A vent pipe (not shown) that passes through the second transparent glass substrate 138 and opens in a sealed space is passed through the rear structural plate 132. The outer end opening of the vent pipe is connected to an exhaust / gas filling device (not shown), and after the air or other gas is sucked and exhausted from the opening, the above-mentioned gas is sealed from the opening. After being injected, the opening is chipped on by heating means and the opening end is closed, and the injected gas is hermetically filled in the sealed space.

  FIG. 10 shows a plasma display device 150 including a plasma display panel 130 assembled as described above with reference to FIG. The plasma display device 150 is modularized. The modularized plasma display device 150 includes an analog interface 151 and a plasma display panel module 152.

  The analog interface 151 includes a Y / C separation circuit 153 including a chroma decoder, an A / D conversion circuit 154, an image format conversion circuit 155, a synchronization signal control circuit 157 including a PLL circuit 156, and an inverse γ conversion circuit 158. And a system control circuit 159 and a PLE control circuit 161. The analog interface 151 converts the received analog video signal (analog RGB signal 162 and analog video signal 163) into a digital video signal, and then outputs the digital video signal 164 to the plasma display panel module 152. More specifically, the analog video signal 163 transmitted from the TV tuner is decomposed into RGB luminance signals by the Y / C separation circuit 153 and then converted into the digital signal 164 by the A / D conversion circuit 154. If the pixel configuration of the plasma display panel module 152 and the pixel configuration of the analog video signal 163 are different, the digital signal 164 is converted into an appropriate image format by the image format conversion circuit 155.

  The analog video signal 163 does not include a sampling clock and data clock signal for A / D conversion. The PLL circuit 156 included in the synchronization signal control circuit 157 generates a sampling clock 165 and a data clock signal 166 based on the horizontal synchronization signal supplied simultaneously with the analog video signal 163. The sampling clock 165 and the data clock signal 166 are output from the analog interface 151 and input to the plasma display panel module 152. The PLE control circuit 161 increases the display luminance when the average luminance level is equal to or lower than a predetermined value, and decreases the display luminance when the average luminance level is equal to or higher than the predetermined value. The system control circuit 159 generates various control signals 167. The control signal 167 is output from the analog interface 151 and input to the plasma display panel module 152.

  The plasma display panel module 152 includes a digital signal processing / control circuit 168, a panel portion 169, and an in-module power supply circuit 171 having a built-in DC / DC converter. The panel portion 169 includes the plasma display panel 130 described above. The digital signal processing / control circuit 168 includes an input interface signal processing circuit 172, a frame memory 173, a memory control circuit 174, and a driver control circuit 175. The average luminance level of the digital video signal 164 input from the analog interface 151 to the input interface signal processing circuit 172 is calculated by an input signal average luminance level calculation circuit (not shown) in the input interface signal processing circuit 172. It is output as data of appropriate bits (example: 5 bits). The PLE control data 176 set corresponding to the average luminance level by the analog interface 151 is input to a luminance level control circuit (not shown) in the input interface signal processing circuit 172.

  The digital signal processing / control circuit 168 processes the above-described signal in the input interface signal processing circuit 172 and transmits the processed control signal 177 to the panel portion 169. The memory control circuit 174 and the driver control circuit 175 generate a memory control signal 178 and a driver control signal 179, respectively, and transmit them to the panel part 169 simultaneously with the transmission of the post-processing control signal 177.

  The panel part 169 drives the plasma display panel 130, a scan driver (mounted on the panel part 169 in the same body) 181 for driving the scan electrode 136 (see FIG. 9), and the data electrode 142 (see FIG. 9). The data driver 182 (mounted on the panel portion 169 and the same body) is formed. The panel portion 169 further includes a high voltage pulse circuit 183 that supplies a pulse voltage to the plasma display panel 130, the scan driver 181, and the data driver 182. The high voltage pulse circuit 183 is arranged and mounted in a plurality of parts of the panel part 169 as a part of the panel part 169.

  The plasma display panel 130 has 1365 × 768 pixels arranged in 1365 (pieces) × 768 (pieces). In the plasma display panel 130, the scanning driver 181 controls the scanning electrode 136 and the data driver 182 controls the data electrode 142, thereby controlling lighting or non-lighting of a predetermined pixel among the number of pixels. Perform the default display.

  A logic power supply (not shown) supplies logic power to the digital signal processing / control circuit 168 and the panel portion 169 via the power input terminal 184. The in-module power supply circuit 171 is supplied with DC power from a display power supply (not shown) via another power input terminal 185, converts the DC power voltage into a predetermined voltage, and supplies it to the panel portion 169. doing.

  The plasma display panel 130, the scan driver 181, the data driver 182, and the high voltage pulse circuit 183 are arranged and mounted on a single substrate constituting the main body of the panel portion 169 together with the power recovery circuit 186. The panel portion 169 integrally constitutes the main body, the plasma display panel 130, the scan driver 181, the data driver 182, the high voltage pulse circuit 183, and the power recovery circuit 186. The digital signal processing / control circuit 168 is separated from the panel portion 169 and formed mechanically independently.

  The in-module power supply circuit 171 is separated from the digital signal processing / control circuit 168 and the panel portion 169 and is formed mechanically independently. The digital signal processing / control circuit 168, the panel portion 169, and the in-module power supply circuit 171 are assembled as one module. The plasma display panel module 152 forms one module assembled in this way. The analog interface 151 is separated from the plasma display panel module 152 and formed mechanically independently. The plasma display panel module 152 is electrically connected to the analog interface 151 by electrical wiring for transmitting a control signal 167, a digital video signal 164, a sampling clock 165, a data clock signal 166, PLE control data 176, and other signals. .

  After the analog interface 151 and the plasma display panel module 152 are separately formed, the analog interface 151 and the plasma display panel module 152 are incorporated in the casing of the plasma display apparatus 150 and are fixedly supported to perform plasma display. The device 150 is assembled. In the plasma display device 150 modularized in this way, the analog interface 151 and the plasma display panel module 152 can be manufactured separately from other device parts. For this reason, when the plasma display device 150 breaks down, the plasma display panel module 152 of the broken plasma display device 150 is replaced with another new plasma display device 150, and the plasma display device 150 is repaired. The repair time can be shortened.

FIG. 1 is a plan view showing a conventional configuration when polishing an edge portion of a display panel. FIG. 2A is a side view showing a conventional configuration when polishing an edge portion of a display panel. FIG. 2B is a side view showing a conventional configuration when the edge portion of the display panel is polished. FIG. 3 is a plan view showing the configuration of the display panel polishing apparatus according to the embodiment of the present invention. FIG. 4A is a side view showing the structure of the grindstone according to the embodiment of the present invention. FIG. 4B is a side view showing the structure of the grindstone according to the embodiment of the present invention. FIG. 4C is a side view showing the structure of the grindstone according to the embodiment of the present invention. FIG. 5 is a plan view showing a configuration when the edge portion of the display panel is polished according to the embodiment of the present invention. FIG. 6A is a side view showing a configuration when the edge portion of the display panel is polished according to the embodiment of the present invention. FIG. 6B is a side view showing a configuration when the edge portion of the display panel is polished according to the embodiment of the present invention. FIG. 7 is a plan view showing a configuration when the edge portion of the display panel is polished according to the embodiment of the present invention. FIG. 8A is a side view showing a configuration when the edge portion of the display panel is polished according to the embodiment of the present invention. FIG. 8B is a side view showing a configuration when the edge portion of the display panel is polished according to the embodiment of the present invention. FIG. 9 is a perspective view showing the configuration of the plasma display panel. FIG. 10 is a schematic diagram showing a circuit configuration of the plasma display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Polishing apparatus 11 Grinding wheel unit 21 1st shape grindstone 22 2nd shape grindstone 23 3rd shape grindstone 31 1st grinding | polishing surface 32 2nd grinding | polishing surface 33 3rd grinding | polishing surface 34 4th grinding | polishing surface 40 Display panel 41 Front substrate 42 Back surface substrate

Claims (27)

A plurality of whetstones;
A rotation mechanism for rotating each of the plurality of grindstones;
A moving mechanism for moving the plurality of grindstones in a first direction,
When processing a display panel in which the first substrate and the second substrate are overlapped so as to have a step,
Each of the plurality of grindstones is rotated by the rotating mechanism, and moved in the first direction by the moving mechanism, thereby polishing each of the plurality of edge portions along the first direction of the display panel. Panel polishing equipment. In claim 1,
Each of the plurality of grindstones rotates on a plane parallel to a plane on which the display panel is arranged. In claim 1 or 2,
The surface on which the display panel is disposed is a placement surface,
The first substrate has a first edge portion and a second edge portion along the first direction as the plurality of edge portions,
The second substrate has a third edge portion along the first direction corresponding to the step as the plurality of edge portions,
The plurality of grindstones are:
A first grindstone for polishing the first edge portion;
A second grindstone for polishing the second edge portion;
A display panel polishing apparatus comprising: a third grindstone for polishing the third edge portion. In claim 3,
At least one of the first, second, and third grindstones includes two polished surfaces,
The display panel polishing apparatus, wherein the two polishing surfaces are formed symmetrically with respect to a plane parallel to the arrangement surface. In claim 3,
The first grindstone includes a first polishing surface,
The second grindstone includes a second polishing surface,
The third grindstone includes a third polishing surface and a fourth polishing surface,
The first polishing surface and the second polishing surface are formed symmetrically with respect to a plane parallel to the arrangement surface,
The display panel polishing apparatus, wherein the third polishing surface and the fourth polishing surface are formed symmetrically with respect to a plane parallel to the arrangement surface. In claim 3,
The first grindstone includes a first polishing surface,
The second grindstone includes a third polishing surface and a fourth polishing surface,
The third grindstone includes a second polishing surface,
The first polishing surface and the second polishing surface are formed symmetrically with respect to a plane parallel to the arrangement surface,
The display panel polishing apparatus, wherein the third polishing surface and the fourth polishing surface are formed symmetrically with respect to a plane parallel to the arrangement surface. In claim 5 or 6,
An angle formed between each of the first, second, third, and fourth polishing surfaces and the arrangement surface is approximately 45 degrees. In any one of Claims 1 thru | or 7,
A display panel polishing apparatus, further comprising a grindstone unit that supports the plurality of grindstones so as to be movable. In claim 8,
The plurality of grindstones are arranged substantially along the first direction of the grindstone unit. In claim 9,
When processing the display panel,
The grindstone unit is disposed so as to cover the display panel,
The plurality of grindstones are arranged so as to sandwich the display panel. A display panel polishing apparatus. In any one of Claims 8 thru | or 10.
When processing the display panel,
The grindstone unit moves in the first direction. A display panel polishing apparatus. In any one of Claims 1 thru | or 11,
The display panel is a plasma display panel. A display panel polishing method in which a front substrate and a rear substrate having different shapes are arranged to face each other,
A polishing method for a display panel, comprising: a first polishing step of simultaneously polishing a step portion between the front substrate and the back substrate and a peripheral portion between the front substrate and the back substrate. In claim 13,
The first polishing step includes
A direction in which the two sides extend the stepped portion and the peripheral portion of the front substrate and the back substrate corresponding to two opposing sides of the display panel when viewed from a direction perpendicular to the display surface of the display panel A method for polishing a display panel, wherein the polishing is performed simultaneously with a grindstone that moves relative to the surface. In claim 14,
A step of rotating the display panel in a plane parallel to the display surface after the polishing of the two sides;
The front substrate, the stepped portion and the peripheral portion of the back substrate corresponding to the other two opposite sides of the display panel when viewed from the direction perpendicular to the display surface of the display panel, the other two And a second polishing step of simultaneously polishing with a grindstone that moves relatively in the direction in which the side extends. A display panel polishing method. In claim 15,
The display panel polishing method, wherein the first polishing step and the second polishing step have different arrangements of the polishing grindstone at the stepped portion and the polishing grindstone at the peripheral portion. Polishing the end face of the display panel with a grindstone rotating on a plane parallel to the display face of the display panel;
Moving the grindstone in a direction perpendicular to a plane parallel to the display surface of the display panel;
Polishing the display panel or an end surface of the display panel different from the display panel with a grindstone rotating on a plane parallel to the display surface of the display panel after the movement. A method of polishing a display panel in which a first substrate and a second substrate are overlapped so as to have a step,
(A) A method of polishing a display panel, comprising: polishing each of a plurality of edge portions along a first direction of the display panel by moving a plurality of rotating grindstones in the first direction. In claim 18,
The plurality of whetstones are supported by a whetstone unit so as to be movable,
The step (a) polishing comprises:
(A-1) contacting the plurality of grindstones with the plurality of edge portions along the first direction;
(A-2) A method of polishing the display panel, comprising: moving the grindstone unit in the first direction. In claim 19,
The step of contacting (a-1) is performed such that the display panel is sandwiched between the plurality of grindstones. In any of claims 18 to 20,
(B) rotating the display panel within a plane on which the display panel is disposed;
(C) aligning a plurality of edge portions along the second direction of the display panel along the first direction;
(D) A method of polishing a display panel, further comprising: polishing a plurality of edge portions along the second direction using the plurality of grindstones, respectively. In claim 21,
The display panel polishing method, wherein the first direction and the second direction are substantially perpendicular. In claim 21 or 22,
The first substrate has a first edge portion and a second edge portion along the first direction,
The second substrate has a third edge portion along the first direction corresponding to the step,
The first substrate has a fourth edge portion along the second direction corresponding to the step,
The second substrate has a fifth edge portion and a sixth edge portion along the second direction,
The plurality of grindstones are:
The first whetstone,
A second whetstone,
Including a third whetstone,
In the step (a) polishing,
The first grindstone polishes the first edge portion,
The second grindstone polishes the second edge portion,
The third grindstone polishes the third edge portion. A display panel polishing method. In claim 23,
In the step (d) polishing,
The first grindstone polishes the fifth edge portion,
The second grindstone polishes the sixth edge portion,
The third grinding wheel polishes the fourth edge portion. A display panel polishing method. In claim 23,
In the step (d) polishing,
The first grindstone polishes the fourth edge portion,
The second grindstone polishes the fifth edge portion,
The third grinding wheel polishes the sixth edge portion. A display panel polishing method. A method for manufacturing a plasma display panel, comprising the method for polishing a display panel according to claim 13. A first step of manufacturing a plasma display panel;
A second step of manufacturing the plasma display panel as a module together with a circuit for driving the plasma display panel;
A method of manufacturing a plasma display device, comprising: a third step of performing format conversion of an image signal and electrically connecting an interface for transmission to the module to the module;
The method for manufacturing a plasma display panel according to claim 26 is performed in the first step.

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