JP2012027272A - Manufacturing method of display panel, and display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a display panel that can suppress cracking in a product and can improve workability, and a display panel.SOLUTION: A manufacturing method of a display panel includes a step of cutting a mother glass substrate 10 by forming first and second scribe lines 31, 32 orthogonal to each other on a surface 11 of the mother glass substrate 10 and extending cracks in a substrate thickness direction from the first and second scribe lines 31, 32. In the method, when forming the first scribe line 31 corresponding to a long side of the display panel (i.e., a long side 6 of a cell 4), a first wheel cutter 50 having zero to five notches along an outer periphery is used, and when forming the second scribe line 32 corresponding to a short side of the display panel (i.e., a short side 8 of the cell 4), a second wheel cutter 60 having 50 to 300 notches 63 along an outer periphery is used.

Description

  The present invention relates to a display panel manufacturing method and a display panel, and more particularly to a liquid crystal panel manufacturing method and a liquid crystal panel.

  As a method for efficiently manufacturing a liquid crystal panel (LCD), a liquid crystal material is sealed between two mother glass substrates (hereinafter simply referred to as “substrates”) to produce a panel, and the panel is cut into a plurality of cells. A method of manufacturing is widely used (see, for example, Patent Document 1). In this method, a scribe break method is used when the panel is cut.

  In the scribe / break method, first, the outer peripheral blade of the wheel cutter is pressed on one substrate constituting the panel and moved while rotating to form first and second scribe lines (initial cracks) orthogonal to each other. To do. Thereafter, the panel is turned over, and a break bar is pressed at a predetermined position on another substrate to apply bending stress to one substrate. Thus, tensile stress is applied to the bottoms of the first and second scribe lines, the cracks are extended in the thickness direction, and one substrate is cut. Next, other substrates are cut in the same manner. In this way, the panel is cut to produce a plurality of cells.

  By the way, when the first scribe line is formed in the vertical direction and then the second scribe line is formed in the horizontal direction, a so-called intersection jump may occur. Intersection line jumping is considered to occur when the wheel cutter forming the second scribe line jumps due to a sudden change in resistance when crossing the first scribe line. When the line jump occurs, the substrate is cut at an unintended position, and the cutting quality deteriorates.

  On the other hand, Patent Document 1 proposes to use a blade having a coarser degree of polishing than the wheel cutter forming the first scribe line as the outer peripheral blade of the wheel cutter forming the second scribe line. Since the rough blade is easy to bite into the substrate, it is possible to suppress the occurrence of crossing jumps when crossing the first scribe line. The degree of polishing is determined by the edge angle of the outer peripheral blade.

  Further, Patent Document 1 proposes forming the first scribe line on a surface that requires higher strength among the cut surfaces of the substrate. As the outer peripheral blade of the wheel cutter that forms the first scribe line, a sharp blade with a fine degree of polishing is used, so that the cut surface becomes smooth and the edge strength increases.

  In recent years, a blade (so-called high penetration blade) provided with a large number of notches along the outer periphery has been developed as an outer peripheral blade of a wheel cutter that forms a scribe line (see, for example, Patent Document 2). . When a scribe line is formed using a high penetration blade, the load is concentrated on the convex portion of the high penetration blade. %. For this reason, the substrate can be cut along the scribe line so that the worker can apply force with the thumb.

JP 2007-140131 A JP 2010-6672 A

  However, in the method described in Patent Document 1, since tensile stress is applied to the bottoms of the first and second scribe lines orthogonal to each other, the direction of the break bar is changed and the break is performed twice, so that workability is poor.

  On the other hand, the method described in Patent Document 2 also has room for improving workability because the worker needs to apply force with the thumb.

  Further, in the method described in Patent Document 2, when the convex portion of the high penetration blade bites into the substrate, stress concentrates on the corner of the biting region (the region indicated by the slanted line in FIG. 9), and the scribe line 101 and Cracks 102 are also formed in the intersecting direction. Therefore, the edge strength of the display panel is low and the display panel is easily broken.

  The present invention has been made in view of the above, and an object of the present invention is to provide a method for manufacturing a display panel that can suppress cracking of a product and can improve workability.

In order to solve the above problems, the first invention is
Forming the first and second scribe lines orthogonal to each other on the surface of the mother glass substrate, and extending the cracks in the thickness direction from the first and second scribe lines, thereby cutting the mother glass substrate; In the manufacturing method of the display panel,
When forming the first scribe line corresponding to the long side of the display panel, using a first wheel cutter having 0 to 5 notches along the outer periphery,
When forming the second scribe line corresponding to the short side of the display panel, a second wheel cutter having 50 to 300 notches along the outer periphery is used.

A second invention is a method of manufacturing a display panel according to the first invention,
After forming the first scribe line using the first wheel cutter, the second scribe line is formed using the second wheel cutter.

  According to the first aspect of the present invention, it is possible to provide a method for manufacturing a display panel that can suppress product breakage and improve workability.

  According to 2nd invention, when a 2nd wheel cutter crosses a 1st scribe line, it can suppress jumping and can suppress that a 2nd scribe line interrupts.

It is process drawing of the manufacturing method of the display panel by one Embodiment of this invention. It is explanatory drawing (1) of a cell preparation process. It is explanatory drawing (2) of a cell preparation process. It is explanatory drawing (3) of a cell preparation process. It is explanatory drawing (4) of a cell preparation process. It is explanatory drawing (5) of a cell preparation process. It is explanatory drawing (1) of the cutting method of a mother glass substrate. It is explanatory drawing (2) of the cutting method of a mother glass substrate. It is a perspective view of a 1st wheel cutter. It is sectional drawing of the mother glass substrate in the use condition of a 1st wheel cutter. It is a perspective view of a 2nd wheel cutter. It is sectional drawing of the mother glass substrate in the use condition of the 2nd wheel cutter. It is a perspective view (1) which shows an example of the mounting state to the portable apparatus of a display panel. It is a perspective view (2) which shows an example of the mounting state to the portable apparatus of a display panel. It is a plane enlarged view of the scribe line formed by the conventional high penetration blade.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In addition, this invention is not restrict | limited to the below-mentioned embodiment, A various deformation | transformation and substitution can be added to below-mentioned embodiment, without deviating from the scope of the present invention.

  FIG. 1 is a process diagram of a method for manufacturing a display panel according to an embodiment of the present invention. In this embodiment, a method for manufacturing a liquid crystal panel (LCD) will be described. However, the present invention may be applied to a method for manufacturing another display panel such as a plasma display panel (PDP) or an organic EL panel.

  As shown in FIG. 1, the liquid crystal panel manufacturing method includes a TFT substrate manufacturing process (step S11), a CF substrate manufacturing process (step S12), a panel manufacturing process (step S13), and a cell manufacturing process (step S14). And a module assembly process (step S15).

  In the TFT substrate manufacturing step (step S11), TFTs (thin film transistors) and the like are formed in a predetermined pattern on one mother glass substrate (hereinafter simply referred to as “substrate”) to manufacture a TFT substrate. In the CF substrate manufacturing step (step S12), a CF substrate is manufactured by forming CF (color filter) or the like in a predetermined pattern on another substrate. There is no restriction | limiting in the order of these process S11, S12, You may implement simultaneously.

  In the panel manufacturing process (step S13), the TFT substrate and the CF substrate are bonded together via a spacer. At that time, the TFT substrate and the CF substrate are bonded together so that the TFT, CF, or the like is disposed between the two substrates. Subsequently, a liquid crystal material is sealed between the TFT substrate and the CF substrate to produce a panel.

  In the cell manufacturing process (step S14), the panel is cut to manufacture a plurality of cells. At that time, as will be described in detail later, each substrate is cut to cut the panel.

  In the module assembling step (step S15), a liquid crystal panel is manufactured by attaching components such as a control circuit for electrically controlling TFTs and a backlight as a light source to the cell.

  In this embodiment, the two substrates are cut after sealing the liquid crystal material. However, the liquid crystal material may be sealed after cutting the two substrates.

  Next, the cell manufacturing process shown in FIG. 1 will be described in detail with reference to FIGS. 2A to 2E and FIGS. 3A to 3B. In the cell manufacturing process, each substrate is cut to cut the panel.

  First, as shown in FIGS. 2A and 3A to 3B, first and second scribe lines (initial cracks) 31 and 32 that are orthogonal to each other are formed on the outer surface 11 of one substrate 10 constituting the panel 2. . A plurality of the first scribe lines 31 are provided in parallel with each other at intervals. Similarly, a plurality of second scribe lines 32 are also provided in parallel with each other at intervals. The intervals may be non-uniform as shown in FIGS. 3A to 3B or may be equal. Note that a TFT or CF (not shown) is formed in advance on the inner surface 12 of one substrate 10.

  Next, as shown in FIG. 2B, the panel 2 is turned over, the break bar 3 is pressed to a predetermined position on the outer surface 21 of the other substrate 20, and bending stress is applied to one substrate 10. As a result, a tensile stress is applied to the bottoms of the first and second scribe lines 31 and 32, cracks are extended from the bottom in the thickness direction, and one substrate 10 is cut.

  Subsequently, as shown in FIG. 2C, the first and second scribe lines orthogonal to each other are shown on the outer surface 21 of the other substrate 20 as in FIG. 2A (only the first scribe line 41 is shown in FIG. 2C). ). Note that a CF or TFT (not shown) is formed in advance on the inner surface 22 of the other substrate 20.

  Finally, as shown in FIG. 2D, the panel 2 is turned over again, the break bar 3 is pressed to a predetermined position on the outer surface 11 of one substrate 10, and the other substrate 20 is cut in the same manner as in FIG. 2B. In this way, as shown in FIG. 2E, the panel 2 is cut to produce a plurality of cells 4.

  In this embodiment, after forming the first and second scribe lines 31 and 32 on the outer surface 11 of one substrate 10, the first and second scribe lines are formed on the outer surface 21 of the other substrate 20. However, these steps may be performed simultaneously.

  Next, the cutting process of the substrate 10 shown in FIGS. 2A to 2B will be described in detail. Note that the cutting process of the substrate 20 shown in FIGS. 2C to 2D is the same and will not be described.

  In the present embodiment, when forming the first scribe line 31 corresponding to the long side of the liquid crystal panel, that is, the long side 6 of the cell 4 shown in FIGS. 3A to 3B in the step shown in FIG. A first cutter wheel 50 having 0 to 5 notches along it is used. On the other hand, when forming the 2nd scribe line 32 corresponding to the short side of a liquid crystal panel, ie, the short side 8 of the cell 4, the 2nd cutter wheel 60 which has 50-300 notches along outer periphery is used. Use. The first and second wheel cutters 50 and 60 may be incorporated in one holder and configured to be movable between a use position and a non-use position, and may be used properly depending on the situation.

  FIG. 4 is a perspective view of the first wheel cutter 50. FIG. 5 is a cross-sectional view of the substrate when the first wheel cutter 50 is in use.

  As shown in FIG. 4, the first wheel cutter 50 is a disk-shaped body having a shaft hole 51 at the center, and has an outer peripheral blade 52. The outer peripheral blade 52 is made of diamond or super steel alloy. The outer peripheral blade 52 is a so-called normal blade, and has 0 to 5 (0 in FIG. 4) notches along the outer periphery. By setting the number of notches to 5 or less, the smooth first scribe line 31 can be formed, and the edge strength of the long side 6 of the cell 4 can be increased. As a result, the edge strength of the long side of the liquid crystal panel can be increased.

  When using the 1st wheel cutter 50, as shown in FIG. 5, the 1st scribe line 31 is formed by moving the outer periphery blade 52 on the board | substrate 10, and rotating it, rotating. At this time, the outer peripheral blade 52 only bites into the substrate 10 by several μm, but the first scribe line 31 is formed to a position deeper than the outer peripheral blade 52.

  The depth D1 of the first scribe line 31 is determined by the load pressing the outer peripheral blade 52, the cutting edge angle of the outer peripheral blade 52, etc., but is preferably 5 to 25% of the plate thickness T of the substrate 10. By setting it to 5% or more, when a tensile stress acts on the bottom of the first scribe line 31, it can be cut along the first scribe line 31. On the other hand, if it exceeds 25%, the load becomes too high, so cracks are also formed in the direction intersecting the first scribe line 31, and the strength of the cut surface is reduced. In addition, the board thickness T of the board | substrate 10 is 0.1-3 mm normally.

  FIG. 6 is a perspective view of the second wheel cutter 60. FIG. 7 is a cross-sectional view of the substrate when the second wheel cutter 60 is in use.

  As shown in FIG. 6, the second wheel cutter 60 is a disk-shaped body having a shaft hole 61 at the center, and has an outer peripheral blade 62. The outer peripheral blade 62 is made of diamond or super steel alloy. This outer peripheral blade 62 is a so-called high penetration blade, and has 50 to 300 notches 63 along the outer periphery.

  When the second wheel cutter 60 is used, the second scribe line 32 is formed by pressing the outer peripheral blade 62 on the substrate 10 and moving it while rotating as shown in FIG. At this time, the outer peripheral edge 62 only bites into the substrate 10 by several μm, but the second scribe line 32 is formed to a position deeper than the outer peripheral edge 62.

  The depth D2 of the second scribe line 32 is determined by the load pressing the outer peripheral blade 62, the edge angle of the outer peripheral blade 62, the number of notches 63, and the like. For example, as the number of the notches 63 increases, the load concentrates on the convex portion 64 of the outer peripheral blade 62, so that the depth D2 of the second scribe line 32 increases. On the other hand, if the number of the notches 63 is too large, the individual notches 63 are too small, and the effect of providing the notches 63 cannot be sufficiently obtained. Therefore, the number of notches 63 is 50 to 300. In the case of 50 to 300, the depth D2 of the second scribe line 32 is about 80% of the plate thickness T of the substrate 10. For this reason, the glass on both sides of the second scribe line 32 can be divided by the force of the thumb.

  Next, as shown in FIG. 2B, the panel is turned over, and the break bar 3 is pressed against the portion of the outer surface 21 of the other substrate 20 facing the first scribe line 31 to apply bending stress to one substrate 10. . As a result, tensile stress acts on the bottom of the first scribe line 31, and a crack extends from the bottom in the thickness direction to reach the inner surface 12 of one substrate 10.

  As a result, stress, impact, and the like act on the second scribe line 32. Then, since the glass on both sides of the second scribe line 32 can be divided by the force of the thumb, cracks extend from the bottom of the second scribe line 32 in the thickness direction, It reaches the inner surface 12 of the substrate 10.

  Thus, in this embodiment, since the board | substrate 10 can be cut | disconnected only by performing a break operation once, without changing the direction of the break bar 3, workability | operativity can be improved.

  In the present embodiment, the cutting process of the substrate 10 shown in FIGS. 2A to 2B and the cutting process of the substrate 20 shown in FIGS. 2C to 2D are the same, but the present invention is not limited to this. For example, any of the cutting steps may be the same as the conventional one.

  By the way, as shown in FIG. 8A to FIG. 8B, a first housing having an input key 73 and the like is provided in a portable device (for example, a mobile phone) 70 on which a liquid crystal panel (including a liquid crystal pen tablet and a touch panel) is mounted. There is one in which a second casing 72 including a liquid crystal panel 74 is connected to 71 so as to be openable and closable. As a connection mechanism, there is one that connects the first housing 71 and the second housing 72 so as to be rotatable. In this case, as shown in FIG. 8A, the short side 78 of the liquid crystal panel 74 is often parallel to the rotation shaft 75.

  FIG. 8A shows a state where the mobile device 70 is opened. In this state, the operator operates the input key 73 and the like based on the screen display of the liquid crystal panel 74 to perform various processes. When not in use, the second housing 72 is rotated with respect to the first housing 71 and folded as shown in FIG. 8B. As a result, the portable device 70 is closed, and an erroneous operation of the input key 73 is prevented and the liquid crystal panel 74 is protected.

  When the portable device 70 is opened and the rod-shaped object 80 such as a pen-type input device or a ballpoint pen is placed on the first or second casing 71 or 72, the portable device 70 is closed. In this case, the long side 76 of the liquid crystal panel 74 is often pressed by the rod-shaped object 80. This is because the rod-like object 80 is easily disposed so as to cross the long side 76 of the liquid crystal panel 74 due to the presence of the rotation shaft 75.

  In the present embodiment, since the corresponding first scribe line 31 is formed with a normal blade, the long side 76 of the liquid crystal panel 74 has a smooth cut surface of the glass as compared with the case where it is formed with a high penetration blade. is there. Therefore, the long side 76 of the liquid crystal panel 74 has high edge strength and is not easily broken even when pressed. Therefore, cracking of the liquid crystal panel 74 can be suppressed.

  In the present embodiment, the liquid crystal panel 74 is mounted on the foldable portable device 70. However, the use of the liquid crystal panel 74 is not limited, and for example, the portable device without the rotating shaft 75 shown in FIGS. 8A to 8B. A liquid crystal panel 74 may be mounted. Also in this case, if the edge strength on the long side 76 side of the liquid crystal panel 74 is high, the average edge strength of the entire outer edge of the liquid crystal panel 74 is high, so that cracking of the liquid crystal panel 74 can be suppressed.

  Next, the order of forming the first scribe line 31 and the second scribe line 32 will be described with reference to FIGS. 3A to 3B again.

  First, as shown to FIG. 3A, the 1st scribe line 31 is formed using the 1st wheel cutter 50 which has a normal blade. A plurality of the first scribe lines 31 are provided in parallel with each other at intervals.

  Next, as shown in FIG. 3B, the second scribe line 32 is formed using the second wheel cutter 60 having a high penetration blade. The second wheel cutter 60 is easy to bite into the substrate 10 because a sufficient number of notches 63 are provided along the outer periphery. Therefore, when the 2nd wheel cutter 60 crosses the 1st scribe line 31, it can suppress jumping by the rapid change of resistance, and it can suppress that the 2nd scribe line 32 interrupts. As a result, the cut surface quality can be improved.

2 Panel 4 Cell 6 Long side 8 Short side 10 Mother glass substrate 11 Outer surface 12 Inner surface 20 Mother glass substrate 21 Outer surface 22 Inner surface 31 First scribe line 32 Second scribe line 50 First wheel cutter 60 Second wheel cutter 63 Notch 74 LCD panel (display panel)
76 Long side 78 Short side

Claims (3)

Forming the first and second scribe lines orthogonal to each other on the surface of the mother glass substrate, and extending the cracks in the thickness direction from the first and second scribe lines, thereby cutting the mother glass substrate; In the manufacturing method of the display panel,
When forming the first scribe line corresponding to the long side of the display panel, using a first wheel cutter having 0 to 5 notches along the outer periphery,
A method of manufacturing a display panel using a second wheel cutter having 50 to 300 notches along an outer periphery when forming the second scribe line corresponding to the short side of the display panel.   2. The method of manufacturing a display panel according to claim 1, wherein after forming the first scribe line using the first wheel cutter, the second scribe line is formed using the second wheel cutter.   A display panel obtained by the method for manufacturing a display panel according to claim 1.

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