JP2008268640A - Method for manufacturing display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend the life of a drill, to form a through-hole without generating defects such as a crack on an electrode substrate and to improve yield in the manufacturing of a display panel on which the through-hole is formed. <P>SOLUTION: A pair of cutting bodies 12a, 12b on each of which an inclined surface 18A projected from the center part to the outer peripheral part is formed on a top surface are used. The tip part 18 of the first cutting body 12a is abutted on a first electrode substrate 6a, and while rotating the first cutting body 12a, a first hole 13a penetrated in the first electrode substrate 6a is formed, and after ejecting the first cutting body 12a from the first hole 13a, the tip part 18 of the second cutting body 12b is abutted on a portion of a second electrode substrate 6b which is faced to the first hole 13a, and while rotating the second cutting body 12b, a second hole 13b is formed in the second electrode substrate 6b and a through-hole 7 for the liquid crystal display panel 1 is formed by the first hole 13a and the second hole 13b. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display panel manufacturing method for manufacturing a display panel having a pair of electrode substrates and having through holes penetrating both electrode substrates.

  Conventionally, by selectively applying a voltage to a plurality of electrodes provided on opposing surfaces of a pair of substrates, the liquid crystal sealed in the gap between the two electrode substrates on which the electrodes are formed is driven to generate characters. A display panel such as a liquid crystal display panel that displays an image such as an image is frequently used as a display unit for an operation display device such as a vehicle or a control / monitoring display device for a machine (for example, see Patent Document 1).

  As shown in FIG. 4, such a display panel transmits a liquid crystal display unit 21 that performs display by driving liquid crystal in a part and a display body disposed on the non-viewing side of the liquid crystal display panel 27 in another part. As the display body, a meter 23 or the like that indicates a current state of a vehicle or a machine by a numerical value or the like is used. In this meter 23, a pointer 25 for indicating a numerical value or the like is rotated about a support shaft 26, and the support shaft 26 is inserted into a through hole formed in the liquid crystal display panel 27. It has become. Therefore, in recent years, a liquid crystal display panel 27 in which a through hole is formed has been manufactured.

  In this method of manufacturing the liquid crystal display panel 27, an electrode, an alignment film or the like is disposed on a predetermined portion of the inner surfaces of a pair of substrates facing each other, and display is performed in the gap between the electrode substrates on which the electrodes and the like are formed. Sealing material is disposed in the peripheral portion of the display area and the portion through which the support shaft 26 is inserted. Both electrode substrates are integrally formed with this sealing material, and a spacer and liquid crystal are enclosed in the interior surrounded by the sealing material and both electrode substrates, thereby manufacturing the liquid crystal display panel 27.

  In order to form a through hole in the liquid crystal display panel 27, a tip 31 of a cutting part 30 of a drill 29 as a cutting body as shown in FIG. , The drill 29 is rotated, and predetermined portions of both electrode substrates are cut by the cutting body 30 to manufacture the liquid crystal display panel 27 in which the through holes are formed.

  The cutting body 30 of the drill 29 used when forming the through hole in the liquid crystal display panel 27 has a flat tip portion 31 that contacts the electrode substrate, and diamond particles (not shown) are formed in the cutting portion. It is mixed. The drill 29 is configured to cut the electrode substrate by rotating the tip portion 31 of the cutting body 30 in contact with the electrode substrate, and heat is generated by friction between the tip portion 31 and the electrode substrate. . For this reason, the cutting body 30 has a cylindrical shape in which a cooling water passage 32 for supplying cooling water to the distal end portion 31 is formed in the central portion along the axial direction.

JP 2005-274438 A

  However, according to the drill 29 used in the method for manufacturing a display panel described above, the tip 31 of the cutting body 30 that is in contact with the electrode substrate is flat. As a result, if the central axis is deviated, the substrate constituting the electrode substrate may be chipped. Further, in order to prevent the center axis of the cutting body 30 from shaking, trial cutting for habituation when using a new drill 29 has to be performed, which is troublesome.

  Further, the drill 29 performs cutting while rotating the tip portion 31 of the cutting body 30 in contact with the electrode substrate. At the time of rotation, the speed of the outer peripheral portion of the tip portion 31 is compared with the speed of the inner peripheral portion. Since it is fast, the frictional force applied to the outer peripheral part is larger than the frictional force applied to the inner peripheral part when the tip 31 of the cutting body 30 contacts the electrode substrate while rotating. Therefore, as the tip 31 of the cutting body 30 continues to be used, as shown in FIG. 6, the outer peripheral portion is worn faster than the inner peripheral portion, and a chamfered portion is formed on the outer peripheral edge. End up. And when forming a through-hole in a display panel using the cutting body 30 which only the outer peripheral part was worn in this way, if a chamfering part contact | abuts to an electrode substrate, a load will be added to a chamfering part perpendicularly | vertically. The substrate may be cracked, and the manufacturing yield of the liquid crystal display panel 27 in which the through holes are formed is reduced. Further, the drill 29 that has been worn in this way cannot be used, and the product life of the drill 29 is short.

  The present invention has been made in view of these points, and can extend the life of a drill, and can form a through-hole without causing defects such as cracks in the electrode substrate. It is an object of the present invention to provide a method for manufacturing a display panel that can improve the manufacturing yield of the manufactured display panel.

  In order to achieve the above object, the display panel manufacturing method according to the present invention is characterized in that it has a pair of electrode substrates including a first electrode substrate and a second electrode substrate, and a through-hole penetrating both the electrode substrates is formed. In the display panel manufacturing method described above, a first cutting body is formed using a pair of cutting bodies including a first cutting body and a second cutting body in which an inclined surface protruding from the center toward the outer periphery is formed at the tip portion. The first cutting body is brought into contact with the first electrode substrate, the first cutting body is rotated to form a first hole penetrating the first electrode substrate, and the first cutting body is removed from the first hole. After the extraction, the tip of the second cutting body is brought into contact with a portion of the second electrode substrate facing the first hole, and the second cutting body is rotated to form a second hole in the second electrode substrate. The display panel is formed by the first hole and the second hole. It lies in forming the through hole.

  According to the display panel manufacturing method of the present invention, an inclined surface protruding from the center toward the outer periphery is formed at the tip of the cutting body of the drill used for forming the through hole in the display panel. Therefore, since the flat surface portion is narrow or there is no flat surface, the center axis of the cutting body is prevented from being shaken at the start of cutting, and defects such as cracks and chips are generated in the electrode substrate. Can be prevented. In addition, since the outer peripheral part is formed to protrude from the inner peripheral part in the inclined surface formed at the tip part, the inclined part of the tip part is not worn away until the tip part becomes flat, It is possible to prevent the chamfered portion from being immediately formed on the outer peripheral edge of the distal end surface.

  Furthermore, the cutting body includes a cutting part having a length longer than the thickness dimension of the electrode substrate, a support part having a width dimension longer than the width dimension of the cutting part, a rear edge of the cutting part, and A taper-shaped connecting portion for connecting the front end edge of the support portion with an inclined surface, and after forming the second hole by the second cutting body, the second cutting body is connected with the connecting portion of the second cutting body. The opening edge of the two holes is chamfered, the second cutting body is removed from the second hole, and the cutting portion of the first cutting body is inserted into the first hole, and the first hole is formed by the connecting portion. The opening edge may be chamfered. Here, in the present invention, the surface of the electrode substrate refers to a surface opposite to the inner surface where both electrode substrates face each other. Thereby, since the chamfering of the opening edge of each hole can be performed, it is possible to prevent the occurrence of defects such as cracks and chips in the opening edge of each hole.

  Further, diamond particles may be mixed in the cutting portion, and an outer peripheral portion at the tip portion may be a horizontal plane. Thereby, it is possible to prevent the sharp tip portion from coming into contact with the electrode substrate and causing defects such as chipping in the electrode substrate.

  Furthermore, a cooling water channel for supplying cooling water to the tip portion may be formed in the cutting portion along the axial direction in the central portion. As a result, the temperature of the tip portion heated by heat generated by friction between the tip portion of the cutting portion and the electrode substrate can be cooled, and a through hole can be formed without causing defects such as cracks in the electrode substrate. In addition, it is possible to prevent the chamfered portion from being immediately formed on the outer peripheral edge of the tip portion, and to extend the life of the drill.

  As described above, according to the method for manufacturing a display panel according to the present invention, since the central axis of the cutting body can be cut at the start of cutting, defects such as cracks and chips occur in the electrode substrate. Without this, a through hole can be formed in the display panel. Thereby, the yield of manufacture of the display panel in which the through-hole was formed can be improved. Further, it is not necessary to perform trial cutting for leveling even when a new cutting body is used, and the efficiency of the cutting work can be improved. Furthermore, by using the cutting body, even if the outer peripheral portion of the tip of the cutting body is worn by friction, a chamfered portion is formed on the outer peripheral edge of the tip until the tip is worn and flattened. Since it is possible to prevent this, it is possible to extend the life of the cutting body.

  Hereinafter, an embodiment of a method for manufacturing a display panel according to the present invention will be described with reference to FIGS. Here, in this embodiment, a liquid crystal display panel is used as the display panel.

  1A to 1E are schematic cross-sectional views showing respective steps of a method of manufacturing a liquid crystal display panel in which through holes are formed in the present embodiment, and FIG. 2 is a manufacturing step of the liquid crystal display panel of FIG. It is a typical sectional view showing a cutting body which performs cutting in a drill used in.

  As shown in FIGS. 1A to 1E and FIG. 2, the manufacturing method of the liquid crystal display panel 1 according to the present embodiment first determines a predetermined inner surface of a pair of transparent substrates 2 made of glass or the like. A transparent electrode 3 made of ITO (Indium Tin Oxide) or the like, an alignment film 5 and the like are laminated and disposed on this portion, and both electrode substrates 6 (6a, 6b) on which the transparent electrode 3 and the like are formed. The sealing material 8 is disposed in the peripheral portion of the display area where the display is performed in the gap) and the portion where the through hole 7 is formed in the liquid crystal display panel 1. Both electrode substrates 6 are integrally formed by this sealing material 8, and a spacer (not shown) and liquid crystal 9 are enclosed in the interior surrounded by the sealing material 8 and both electrode substrates 6 to manufacture the liquid crystal display panel 1.

  Subsequently, the through hole 7 is formed in a predetermined portion of the liquid crystal display panel 1 using a pair of drills 11 (11a, 11b).

  Each of the cutting bodies 12 (12a, 12b) for cutting with both drills 11 has a cutting part 15 having a length longer than the thickness of the electrode substrate 6 constituting the liquid crystal display panel 1 and a width dimension of the cutting part 15. And a support portion 16 having a long width, and a tapered connection portion 17 that connects the rear end edge of the cutting portion 15 and the front end edge of the support portion 16 with an inclined surface.

  Diamond particles (not shown) are mixed in the cutting body 12, and the tip 18 of the cutting body 12 is formed with an inclined surface 18A protruding from the center toward the outer periphery, and the outer periphery of the tip is It is set as the horizontal surface 18B. Further, the cutting body 12 is formed with a cooling water passage 19 for supplying cooling water to the tip 18 at the time of cutting along the axial direction in the central portion of the cutting body 12. It is formed in a substantially cylindrical shape.

  In the present embodiment, the outer peripheral portion of the ring-shaped tip end portion ½ of the width dimension in the radial direction is the horizontal surface 18B, and the remaining half inner peripheral portion is the inclined surface 18A. The inclined surface 18A is formed so as to be inclined by 15 ° with respect to the horizontal surface 18B.

  First, as shown in FIG. 1A, the tip 18 of the first cutting body 12 a in the first drill 11 a of both drills 11 is replaced with the first one of both electrode substrates 6 constituting the liquid crystal display panel 1. It is made to contact | abut to the surface of the part in which the through-hole 7 in the electrode substrate 6a is formed. Here, the surface of the electrode substrate 6 is an inner surface on which the transparent electrode 3 is disposed and an opposite surface. Then, the first cutting body 12a is rotated and the first electrode substrate 6a is cut by the tip 18 mixed with the diamond particles while supplying the coolant to the tip 18 via the cooling water channel 19 to cut the first electrode substrate 6a. The cutting part 15 of the cutting body 12a is inserted into the first electrode substrate 6a. Then, as shown in FIG. 1 (b), after the first cutting body 12a forms the first hole 13a penetrating the first electrode substrate 6a in a part of the first electrode substrate 6a and the sealing material 8, the first cutting is performed. The body 12a is extracted from the first hole 13a.

  Next, the tip 18 of the second cutting body 12b is brought into contact with a portion of the surface of the second electrode substrate 6b facing the first hole 13a in the first electrode substrate 6a to rotate the second cutting body 12b. . And while supplying cooling water to the front-end | tip part 18 via the cooling water channel 19, the 2nd electrode board | substrate 6b is cut by the front-end | tip part 18 in which the diamond particle was mixed, and the cutting part 15 of the 2nd cutting body 12b is made into 2nd. As shown in FIG. 1C, the second hole 13b penetrating through the second electrode substrate 6b is formed in a part of the second electrode substrate 6b and the sealing material 8 as inserted into the electrode substrate 6b.

  Subsequently, the chamfering of the opening edge of the second hole 13b is performed by further rotating the second cutting body 12b and bringing the tip of the connecting portion 17 in the second cutting body 12b into contact with the surface of the second electrode substrate 6b. After performing, the 2nd cutting body 12b is extracted from the 2nd hole 13b.

  Further, the first cutting body 12a is inserted into the first hole 13a again, and the first cutting body 12a is rotated so that the tip portion of the connecting portion 17 in the first cutting body 12a contacts the surface of the first electrode substrate 6a. Then, after chamfering the opening edge of the first hole 13a, the first cutting body 12a is removed from the first hole 13a. Thus, the through hole 7 is formed in the liquid crystal display panel 1 by the first hole 13a and the second hole 13b.

  The first electrode substrate 6 a that performs cutting first is preferably the electrode substrate 6 on the lower surface side of the pair of electrode substrates 6. The electrode substrate 6 is cut by the cutting body 12, and the shape of the electrode substrate 6 is cut into a donut shape, and the fragments of the electrode substrate 6 corresponding to the central portion of the hole are lowered by the cutting of the second electrode substrate 6b. It can be easily removed. That is, during the chamfering operation of the opening edge of the second hole 13b of the second electrode substrate 6b after the formation of the second hole 13b, the fragments of the electrode substrate 6 at the time of cutting are not automatically present in the through hole. The broken pieces of the electrode substrate 6 can prevent the through hole from being damaged.

  Further, when forming the first hole 13a, it is preferable that the insertion dimension of the first cutting body 12a exceeds the thickness dimension of the first electrode substrate 6a and is one third of the thickness of the second electrode substrate 6b. . As the number of cuts is increased, the outer peripheral edge of the horizontal surface 18B of the tip 18 of the cutting body 12 is gradually chamfered. That is, the size of the hole becomes smaller at the tip end portion 18 of the cutting body 12 and the base portion of the cutting portion 15 as the tip end portion 18. In order to keep the hole size of the through-hole constant at any part, the insertion size of the cutting body 12 with respect to the electrode substrate 6 is equal to or larger than the thickness size of the electrode substrate 6 and further to 3/3 of the thickness size of the second electrode substrate 6b. The dimensions are up to 1.

  According to the present embodiment, the inclined surface 18A that protrudes from the central portion toward the outer peripheral portion is formed at the distal end portion 18 of the cutting body 12 of the drill 11 used for forming the through hole 7 in the liquid crystal display panel 1. Therefore, since the portion of the horizontal surface 18B is narrow, it is possible to prevent the center axis of the cutting body 12 from being shaken at the start of cutting. Further, in the inclined surface 18A formed at the distal end portion 18, the outer peripheral portion is formed so as to protrude from the inner peripheral portion, so that the inclined surface 18A of the distal end portion 18 is worn as shown in FIG. It is possible to prevent the chamfered portion from being immediately formed on the outer peripheral edge of the tip end portion 18 until the tip end portion 18 becomes flat.

  Accordingly, since the center axis of the cutting body 12 can be cut at the start of cutting, the through holes 7 are formed in the liquid crystal display panel 1 without causing defects such as cracks and chips in the electrode substrate 6. be able to. Thereby, the yield of manufacture of the liquid crystal display panel 1 in which the through-hole 7 was formed can be improved. In addition, it is not necessary to perform trial cutting for leveling when a new drill 11 is used, and the efficiency of the cutting operation can be improved.

  Further, by using the drill 11, even if the outer peripheral portion of the tip 18 in the cutting body 12 is worn by friction, the outer periphery of the tip 18 is faced until the tip 18 is worn and flattened. Since it is possible to prevent the catch from being formed, the life of the drill 11 can be extended.

  Thereby, when the drill 11 with the tip 18 of the conventional cutting body 12 having a horizontal surface 18B is used, 2000 liquid crystals are formed until a chamfer is formed on the outer peripheral edge of the tip 18 of the cutting body 12. Whereas the through-hole 7 can be formed in the display panel 1, when using the drill 11 in which the inclined surface 18A is formed at the tip 18 of the cutting body 12 of this embodiment, 2500 or more liquid crystal displays A through hole 7 could be formed in the panel 1.

  Also, diamond particles are mixed in the cutting body 12 and the outer peripheral portion of the tip 18 is a horizontal surface 18B, so that the sharp cutting portion 15 comes into contact with the electrode substrate 6 to cause defects such as chipping in the electrode substrate 6. Can be prevented.

  Further, in the cutting body 12 in which the cooling water channel 19 for supplying the cooling water to the leading end portion 18 of the cutting body 12 is formed along the axial direction in the central portion of the cutting body 12, the leading end portion of the cutting body 12 is also provided. The temperature of the tip 18 heated by heat generated by friction between the electrode 18 and the electrode substrate 6 can be cooled, the through-hole 7 can be formed without causing defects such as cracks in the electrode substrate 6, and The life of the drill 11 can be extended.

  Furthermore, by chamfering the opening edge of each hole by bringing the tapered connecting portion 17 of the cutting body 12 into contact with the surface of the electrode substrate 6, there is a defect such as a crack or a chip in the opening edge of each hole. It can be prevented from occurring.

  In addition, this invention is not limited to the said embodiment, A various change is possible as needed.

  For example, in the present embodiment, a part of the sealing material 8 disposed in a portion where the through hole 7 is formed by the first cutting body 12a is cut from the first hole 13a side, and the sealing material 8 is cut by the second cutting body 12b. The through hole 7 is formed by cutting the other part from the second hole 13 side, but the present invention is not limited to this, and the sealing material 8 is formed by either the first cutting body 12a or the second cutting body 12b. May be penetrated.

(A)-(e) is typical sectional drawing which shows each process in an example of the manufacturing method of the display panel which concerns on this invention. Typical sectional drawing which shows the cutting body of the drill used for the manufacturing method of the display panel of FIG. Typical sectional drawing which shows the state which the front-end | tip part of the cutting body shown in FIG. 2 worn out Typical top view which shows an example of the display panel manufactured in the manufacturing method of the conventional display panel Typical sectional drawing which shows the cutting body of the drill used in the manufacturing method of the display panel of FIG. Typical sectional drawing which shows the state which the front end surface of the cutting body shown in FIG. 5 worn out

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Transparent substrate 3 Transparent electrode 5 Orientation film 6a (6) 1st electrode substrate 6b (6) 2nd electrode substrate 7 Through-hole 8 Sealing material 9 Liquid crystal 11a (11) 1st drill 11b (11) 2nd Drill 12a (12) 1st cutting body 12b (12) 2nd cutting body 13a 1st hole 13b 2nd hole 15 Cutting part 16 Support part 17 Connection part 18 Tip part 18A Inclined surface 18B Horizontal surface 19 Cooling channel 19

Claims (2)

In a method for manufacturing a display panel, which includes a pair of electrode substrates including a first electrode substrate and a second electrode substrate, and a through-hole penetrating the both electrode substrates is formed,
A pair of cutting bodies each composed of a first cutting body and a second cutting body each having an inclined surface projecting from the center toward the outer periphery at the tip portion is used, and the tip portion of the first cutting body is defined as the first electrode. Contacting the substrate, rotating the first cutting body to form a first hole penetrating the first electrode substrate, and after removing the first cutting body from the first hole, The tip portion is brought into contact with a portion of the second electrode substrate facing the first hole, the second cutting body is rotated to form a second hole in the second electrode substrate, and the first hole and The method for manufacturing a display panel, wherein the through hole of the display panel is formed by the second hole. The cutting body includes a cutting part having a length longer than the thickness dimension of the electrode substrate, a support part having a width dimension longer than the width dimension of the cutting part, a rear edge of the cutting part, and the support part A taper-shaped connecting portion for connecting the tip edge of the head by an inclined surface,
After the second hole is formed by the second cutting body, the opening edge of the second hole is chamfered by the connecting portion of the second cutting body, and the second cutting body is removed from the second hole, Furthermore, the manufacturing method of the display panel of Claim 1 which inserts the said cutting part of a said 1st cutting body in the said 1st hole, and chamfers the opening edge of the said 1st hole with the said connection part.

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