JP2006106204A - Method for manufacturing liquid crystal display panel, and liquid crystal display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal display panel, with which a high yield is achieved. <P>SOLUTION: A predetermined position of an inside surface of at least one substrate out of a pair of substrates 2, 3 is prescribed, and a predetermined position of an outside surface thereof is scribed. At least one substrate out of the pair of substrates 2, 3 is cut off to predetermined sizes, according to the site to be prescribed (Lai or Lbi) and the site to be scribed (Lao or Lbo). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method of manufacturing a liquid crystal display panel and a liquid crystal display panel, and in particular, a pair of substrates (more specifically, a TFT substrate and a CF substrate) are provided with a predetermined size. More particularly, the present invention relates to a method for manufacturing a liquid crystal display panel that prevents cracks and chips from occurring on a cut surface of a substrate, and a liquid crystal display panel manufactured by such a method for manufacturing a liquid crystal display panel.

  Recently, liquid crystal displays have been widely used in display units of notebook computers, electronic notebooks, videophones, mobile phones, video cameras, car navigation systems, and other electrical / electronic devices.

  FIG. 4 is a diagram schematically showing the configuration of a liquid crystal display panel of a conventional liquid crystal display, and FIG. 4A is a cross-sectional view schematically showing the configuration of a conventional liquid crystal display panel. 4 (b) is a side view schematically showing a state in which the liquid crystal display panel shown in FIG. 4 (a) is viewed in the arrow direction shown in FIG. 4 (a) with one substrate (TFT substrate) as the center. FIG.

  As shown in FIG. 4A, the liquid crystal display panel 101 includes two thin glass substrates 102 and 103, and the two thin glass substrates 102 and 103 have a gap Sp at a predetermined interval. The liquid crystal Lc is confined in the gap Sp.

  In FIG. 4A, the member denoted by 104 is an alignment film, the member denoted by 105 indicates a sealing material, the member denoted by 106 indicates a spacer, and denoted by 107. The member indicates a polarizing film.

  FIG. 5 is a manufacturing process diagram of a liquid crystal display panel schematically showing a conventional method for manufacturing a liquid crystal display panel.

  Conventionally, when the liquid crystal display panel 101 is manufactured, first, as shown in FIG. 5A, a substrate (TFT substrate) 102 on which a TFT element is formed is manufactured, and a color filter is formed. The substrate (CF substrate) 103 on the side that is formed is manufactured.

  Next, the substrate (TFT substrate) 102 and the substrate (CF substrate) 103 are cleaned.

  Further, the alignment film 104 is printed on both the substrate (TFT substrate) 102 and the substrate (CF substrate) 103, and then both substrates are baked at about 200 degrees.

  Next, for example, using a device in which a cloth is wound around a roller, each of the substrate (TFT substrate) 102 and the substrate (CF substrate) 103 is rubbed in a predetermined direction, and then washed, and then the substrate (TFT substrate) 102 and the substrate (CF substrate) The cloth hair adhering to each of 103 is removed.

  Next, a portion for confining the liquid crystal is formed by screen printing.

  As the sealing material 105 for confining the liquid crystal, an adhesive (for example, an epoxy resin adhesive) or the like is used.

  In this adhesive, glass fiber is mixed in order to keep the thickness of the sealing material 105 constant.

  Next, when the substrate (TFT substrate) 102 and the substrate (CF substrate) 103 are bonded together, a conductive material for electrically connecting the counter electrode of the substrate (CF substrate) 103 to a specific portion of the substrate (TFT substrate) 102 (Carbon paste) (not shown) is adhered.

  Further, a plastic bead (spacer) 106 having a constant sphere diameter for keeping the gap Sp between the substrate (TFT substrate) 102 and the substrate (CF substrate) 103, that is, the thickness of the liquid crystal layer, is dispersed.

  Next, as shown in FIG. 5B, the substrate (TFT substrate) 102 and the substrate (CF substrate) 103 are bonded to each other with a predetermined interval. More specifically, after the substrate (TFT substrate) 102 and the substrate (CF substrate) 103 are bonded together, the sealing material 105... Is heated and cured under pressure.

  Next, as shown in FIG. 5C, a scribe line La is formed on the outer surface of the substrate (CF substrate) 103 using a cutter 122 (or a laser beam).

  Next, as shown in FIG. 5D, a roller 123 is used to apply pressure from the outer surface side of the substrate (TFT substrate) 102 to the substrate (CF substrate) 103 on which the scribe line La is formed, The formed substrate (CF substrate) 103 is divided into a predetermined size according to the scribe line La.

  Thereafter, as shown in FIG. 5E, a scribe line Lb is formed on the outer surface of the substrate (TFT substrate) 102 using a cutter 122 (or a laser beam).

  Thereafter, as shown in FIG. 5 (f), a roller 123 is used to apply pressure to the substrate (TFT substrate) 102 from the outer surface side of the substrate (CF substrate) 103 to form a scribe line Lb (TFT substrate). ) 102 is divided into a predetermined size according to the scribe line Lb.

  In the step shown in FIG. 5D, an example is shown in which the substrate (CF substrate) 103 on which the scribe line La is formed is divided using a roller, but the substrate (CF substrate) 103 on which the scribe line La is formed is shown. The substrate (CF substrate) 103 on which the scribe line La is formed may be laser beam heated in the vicinity of the scribe line La and then rapidly cooled to divide the scribed substrate (CF substrate) 103 into a predetermined size.

  In the step shown in FIG. 5F, the roller 123 is used to divide the substrate (TFT substrate) 102 on which the scribe line Lb is formed. However, the substrate on which the scribe line Lb is formed (TFT substrate). 102 may divide the scribed substrate (TFT substrate) 102 by heating the laser beam near the scribe line Lb in the vicinity of the substrate (TFT substrate) 102 on which the scribe line Lb is formed and then rapidly cooling it.

  In the above-described method for manufacturing a liquid crystal display panel, first, the scribe line La is formed on the substrate (CF substrate) 103, and the substrate (CF substrate) 103 on which the scribe line La is formed is divided into a predetermined size. The example in which the scribe line Lb is formed on the substrate (TFT substrate) 102 and the TFT substrate (mother glass) 102 on which the scribe line Lb is formed is divided is shown. First, the scribe line Lb is formed on the TFT substrate (mother glass) 102. After the substrate (TFT substrate) 102 on which the scribe line Lb is formed is divided, the scribe line La is formed on the substrate (CF substrate) 103, and the substrate (CF substrate) 103 on which the scribe line La is formed It may be divided into sizes.

  Thereafter, as described above, liquid crystal is injected by a vacuum injection method into the gap between the substrate (TFT substrate) and the substrate (CF substrate) cut into a predetermined size.

  After injecting liquid crystal into the gap between the substrate (TFT substrate) and the substrate (CF substrate) cut into a predetermined size, the liquid crystal injection port into which the liquid crystal Lc is injected is used as a sealing material (for example, an ultraviolet curable resin). To obtain a liquid crystal display panel 101.

  Thereafter, the liquid crystal display panel 101 manufactured by the above steps is washed, and the liquid crystal and the like attached to the periphery of the liquid crystal display panel 101 is washed away.

  Thereafter, a polarizing film is attached to the glass surface of the liquid crystal display panel 101 with care so that dust does not enter between the glass and the polarizing film.

  Thereafter, a backlight (not shown) is provided on the back surface of the liquid crystal display panel 101 to produce a liquid crystal display (not shown).

  In addition, the glass cut surface of the liquid crystal display panel 101 manufactured by the manufacturing method as described above has a glass substrate (in FIG. 4B, the substrate (TFT substrate) 102) as shown in FIG. A rib mark R is formed on the outer surface side.

  In FIG. 4B, a region indicated by MC is a mechanical crack region formed when the scribe line La is formed on the outer surface of the substrate (TFT substrate) 102 using a cutter. The region shown is a region of a mark generated on a divided section of the divided substrate when the substrate (TFT substrate) 102 is divided into a predetermined size.

Here, the configuration of the cut surface of the substrate (TFT substrate) 102 has been mainly described, but a rib mark is also formed on the outer surface side of the cut surface on the substrate (CF substrate) 103 side.
JP 2004-157145 A

  However, the above-described method for manufacturing a liquid crystal display panel has a problem that when a pair of substrates is divided into a predetermined size, the cut surface is cracked or chipped, and the cut surface is not formed in a desired direction. There is.

  The present invention has been made to solve the above-described problem, and can produce a liquid crystal display panel that can suppress the generation of cracks and chips on a cut surface when dividing a pair of substrates into a predetermined size. An object of the present invention is to provide a liquid crystal display panel manufactured by the method and the method of manufacturing the liquid crystal display panel.

  The method for manufacturing a liquid crystal display panel according to claim 1 is a method for manufacturing a liquid crystal display panel in which a liquid crystal is sandwiched between a pair of substrates, and the inner surface of at least one of the pair of substrates is predetermined. This part was press-scribed and a predetermined part on the outer surface was scribed, and at least one of the pair of substrates was divided into a predetermined size according to the pre-scribe part and the scribe part.

  Note that the term “press scribe” used in this specification is used to distinguish the scribe on the inner surface of the substrate from the scribe on the outer surface of the substrate because the scribe is formed before the pair of substrates are bonded together. .

  According to a second aspect of the present invention, there is provided a liquid crystal display panel manufacturing method comprising: a press scribe portion provided on an inner surface of at least one of a pair of substrates; It provided so that it might align with the provided scribe part.

  The method for producing a liquid crystal display panel according to claim 3 is the method for producing a liquid crystal display panel according to claim 1 or 2, wherein the press scribe and the scribe are performed by using a cutter or a laser beam.

  The method for manufacturing a liquid crystal display panel according to a fourth aspect is the method for manufacturing a liquid crystal display panel according to any one of the first to third aspects, wherein the press scribe and the scribe are formed by different methods.

  In the liquid crystal display panel according to claim 5, rib marks are formed on both the outer surface side and the inner surface side of at least one cut surface of the pair of substrates forming the liquid crystal display panel.

  The liquid crystal display panel according to claim 6 is the liquid crystal display panel according to claim 5 on both the outer surface side and the inner surface side of the cut surface of at least one of the pair of substrates forming the liquid crystal display panel. The formed rib marks are different.

  In the manufacturing method of the liquid crystal display panel according to claim 1, since the press scribe portion for dividing the pair of substrates into a predetermined size is formed on the inner surface, when dividing at least one of the pair of substrates, It is possible to suppress cracks and chips on the substrate cross section.

  In the method for manufacturing a liquid crystal display panel according to claim 2, the press scribe portion provided on the inner surface of at least one of the pair of substrates and the scribe portion provided on the outer surface are provided so as to be aligned. When dividing at least one of the pair of substrates into a predetermined size, a desired cut surface is formed, and cracks and chips can be suppressed in the divided section of the substrate.

  In the method of manufacturing the liquid crystal display panel according to claim 3, the scribe line is formed by a cutter or a laser beam without using a special method, so that the scribe line can be easily formed on the mother glass. Can be formed.

  The method for manufacturing a liquid crystal display panel according to claim 4, when the press scribe and the scribe are formed by different methods, when dividing at least one of the pair of substrates into a predetermined size, A desired cut surface can be formed, and cracks and chips can be suppressed in the cross section of the substrate.

  Since the liquid crystal display panel according to claim 5 or 6 can be manufactured by the method for manufacturing a liquid crystal display panel according to the present invention, the yield is high.

  Hereinafter, an example of a method for manufacturing a liquid crystal display panel according to the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a diagram schematically illustrating a configuration of a liquid crystal display panel according to the present invention, and FIG. 1A is a cross-sectional view schematically illustrating a configuration of a liquid crystal display panel according to the present invention. FIG. 1B is a side view schematically showing the liquid crystal display panel shown in FIG. 1A viewed from the substrate (TFT substrate) in the arrow direction shown in FIG. It is.

  As shown in FIG. 1A, the liquid crystal display panel 1 includes two thin glass substrates 2 and 3, and the two thin glass substrates 2 and 3 have a gap Sp at a predetermined interval. The liquid crystal Lc is confined in the gap Sp.

  In FIG. 1A, a member indicated by 4 is an alignment film, a member indicated by 5 indicates a sealing material, a member indicated by 6 indicates a spacer, and is indicated by 7. The member indicates a polarizing film.

  FIG. 2 is a process diagram schematically showing an example of a method for manufacturing a liquid crystal display panel according to the present invention.

  When the liquid crystal display panel 1 is manufactured, first, as shown in FIG. 2A, a substrate (TFT substrate) 2 on which a TFT element is formed is manufactured, and a color filter is formed. The side substrate (CF substrate) 3 is manufactured.

  Next, the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are cleaned.

  Next, the alignment film 4 is printed on both the substrate (TFT substrate) 2 and the substrate (CF substrate) 3, and then both substrates are baked at about 200 degrees.

  The above steps are the same as the conventional method for manufacturing a liquid crystal display panel shown in FIG. 5. In this method for manufacturing a liquid crystal display panel, a substrate (TFT substrate) 2 and a substrate (CF substrate) 3 are bonded together. Then, a scribe line (press scribe part) Lbi is formed on the surface (inner surface of the TFT substrate 2) of the substrate (TFT substrate) 2 opposite to the surface of the substrate (CF substrate) 3, and the substrate (CF substrate) 3, a scribe line (press scribe part) Lai is formed on the surface (inner surface of the substrate (CF substrate) 2) facing the surface of the substrate (TFT substrate) 2.

  In this example, the scribe line (press scribe portion) Lbi and the scribe line (press scribe portion) Lai are formed by using the laser irradiation means 21 and a laser beam. ) Lbi and scribe line (press scribe part) Lai may be formed using a cutter.

  Next, for example, using a device in which a cloth is wound around a roller, each of the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 is rubbed in a predetermined direction, washed, and then cleaned. (CF substrate) The hair of the cloth adhering to each of the 3 is removed.

  Next, a portion for confining the liquid crystal is formed by screen printing.

  As the sealing material 5 for confining the liquid crystal, an adhesive (for example, an epoxy resin adhesive) or the like is used.

  In this adhesive, glass fiber is mixed in order to keep the thickness of the sealing material 5 constant.

  Next, when the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are bonded together, a conductive material for electrically connecting the counter electrode of the substrate (CF substrate) 3 to a specific portion of the substrate (TFT substrate) 2 (Carbon paste) (not shown) is adhered.

  Further, a plastic bead (spacer) 6 having a constant spherical diameter for keeping the gap Sp between the substrate (TFT substrate) 2 and the substrate (CF substrate) 3, that is, the thickness of the liquid crystal layer, is dispersed.

  Next, as shown in FIG. 2B, the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are bonded together. More specifically, after the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are bonded to each other, the sealing material 5 is heated and cured in a state where pressure is applied.

  Next, as shown in FIG. 2C, a scribe line Lao is formed on the outer surface of the substrate (CF substrate) 3 using a cutter 22.

  Here, an example in which the scribe line Lao is formed using the cutter 22 is shown, but the scribe line Lao may be formed using a laser beam.

  Next, as shown in FIG. 2 (d), a substrate (CF substrate) on which a scribe line (press scribe portion) Lai and a scribe line Lao are formed from the outer surface side of the substrate (TFT substrate) 2 using a roller 23. ) A pressure is applied to 3, and the substrate (CF substrate) 3 on which the scribe line (press scribe portion) Lai and the scribe line Lao are formed is divided into a predetermined size.

  Thereafter, as shown in FIG. 2E, a scribe line Lbo is formed on the outer surface of the substrate (TFT substrate) 2 using a cutter 21.

  Here, an example in which the scribe line Lbo is formed using the cutter 22 is shown, but the scribe line Lbo may be formed using a laser beam.

  Thereafter, as shown in FIG. 2 (f), a substrate (TFT substrate) on which a scribe line (press scribe portion) Lbi and a scribe line Lbo are formed from the outer surface side of the substrate (CF substrate) 3 using a roller 23. A pressure is applied to the substrate 2 to divide the substrate (TFT substrate) 2 on which the scribe line (press scribe portion) Lbi and the scribe line Lbo are formed into a predetermined size.

  Through the above process, at this stage, the pair of substrates (TFT substrate 2 and CF substrate 3) is divided into the panel size of the liquid crystal display.

  In the step shown in FIG. 2D, an example is shown in which a substrate (CF substrate) 3 on which a scribe line (press scribe site) Lai and a scribe line Lao are formed is divided into a predetermined size using a roller. However, the substrate (CF substrate) 3 on which the scribe line (press scribe site) Lai and the scribe line Lao is formed is the CF substrate (mother glass) 3 on which the scribe line (press scribe site) Lai and the scribe line Lao is formed. The vicinity of the scribe line Lao may be heated with a laser beam and then rapidly cooled to divide the scribed substrate (CF substrate) 3 into a predetermined size.

  In the step shown in FIG. 2F, an example is shown in which a substrate (TFT substrate) 2 on which a scribe line (press scribe portion) Lbi and a scribe line Lbo are formed is divided into a predetermined size using a roller. However, the substrate (TFT substrate) 2 on which the scribe line (press scribe portion) Lbi and the scribe line Lbo are formed is the scribe of the substrate (TFT substrate) 2 on which the scribe line (press scribe portion) Lbi and the scribe line Lbo are formed. The vicinity of the line Lbo may be laser beam heated and then rapidly cooled to divide the scribed substrate (TFT substrate) 2 into a predetermined size.

  Further, in the above-described liquid crystal display panel manufacturing method, first, the scribe line Lao is formed on the substrate (CF substrate) 3, and the substrate (CF substrate) 3 on which the scribe line Lao is formed is divided into a predetermined size. An example in which the scribe line Lbo is formed on the substrate (TFT substrate) 2 and the substrate (TFT substrate) 2 on which the scribe line Lbo is formed is divided into a predetermined size is shown. After the line Lbo is formed and the substrate (TFT substrate) 2 on which the scribe line Lbo is formed is divided into a predetermined size, the scribe line Lao is formed on the substrate (CF substrate) 3, and the substrate (CF on which the scribe line Lao is formed) Substrate) 3 may be divided into a predetermined size.

  Thereafter, liquid crystal is injected by a vacuum injection method into a gap between a pair of substrates (TFT substrate and CF substrate) cut into a predetermined size as described above.

  After injecting liquid crystal into a gap between a pair of substrates (TFT substrate 2 and CF substrate 3) cut into a predetermined size, the liquid crystal injection port into which the liquid crystal has been injected is sealed with a sealing material (for example, an ultraviolet curable resin). The liquid crystal display panel 1 is obtained.

  Thereafter, the liquid crystal display panel manufactured by the above steps is washed, and the liquid crystal adhering to the periphery of the liquid crystal display panel is washed away.

  Thereafter, the polarizing film 7 is attached to the glass surface of the liquid crystal display panel 1 with care so that dust or the like does not enter between the glasses 2 and 3 and the polarizing film 7.

  Thereafter, a backlight is provided on the back surface of the liquid crystal display panel 1 to produce a liquid crystal display.

  In this method of manufacturing the liquid crystal display panel 1, a scribe line for dividing a pair of substrates (TFT substrate 2 and CF substrate 3) into a predetermined size is formed on the outer surface of each of the pair of substrates (TFT substrate 2 and CF substrate 3). (See scribe line Lao and scribe line Lbo), and scribe lines were formed on the inner surface side of each of the pair of substrates (TFT substrate 2 and CF substrate 3) (scribe line (press scribe site). ) Lai and scribe line (press scribe part) Lbi.) Therefore, when dividing a pair of substrates (TFT substrate 2 and CF substrate 3) into a predetermined size, a pair of substrates (TFT substrate 2 and CF substrate) It can suppress that a crack and a chip | tip arise in the cut surface of 3).

  In the method of manufacturing the liquid crystal display panel 1, an example in which scribe lines are provided on the inner surfaces of both of the pair of substrates (TFT substrate 2 and CF substrate 3) has been shown (scribe line (press scribe part) Lai and Scribe line (press scribe part) Lbi)), a scribe line is provided only on one inner surface of a pair of substrates (TFT substrate 2 and CF substrate 3), and a pair of substrates (TFT substrate 2 and CF substrate 3) A liquid crystal display panel manufacturing method in which scribe lines are provided on both outer surfaces is also included in the liquid crystal display panel manufacturing method according to the present invention.

  In such a liquid crystal display panel manufacturing method, a scribe line for dividing a pair of substrates (TFT substrate 2 and CF substrate 3) into a predetermined size is formed on at least one of the pair of substrates (TFT substrate 2 and CF substrate 3). Since it was formed not only on the outer surface of the mother glass (see scribe line Lbo or scribe line Lao) but also on the inner surface (see scribe line (press scribe site) Lbi or scribe line (press scribe site) Lai). When dividing at least one pair of substrates (TFT substrate 2 and CF substrate 3) into a predetermined size, a pair of substrates (TFT substrate 2 and CF substrate 3). ) Can be prevented from being cracked or chipped.

  In this liquid crystal display panel manufacturing method, the press scribe line provided on the inner surface of at least one of the pair of substrates (TFT substrate 2 and CF substrate 3) and the scribe line provided on the outer surface are aligned. Thus, when at least one of the pair of substrates is divided into a predetermined size, the occurrence of cracks in an unexpected direction is suppressed, and a desired cut surface is formed.

  Further, a substrate (TFT substrate) 2 on which a scribe line (press scribe portion) Lbi and a scribe line Lbo are formed using a roller 23, and a substrate (CF substrate) 3 on which a scribe line (press scribe portion) Lai is formed. In the step of dividing the substrate (TFT substrate) 2 in the pasted state, if the substrate (CF substrate) 3 is divided together with the substrate (TFT substrate) 2, the outside of the substrate (CF substrate) 3 is removed. It is not necessary to provide the scribe line Lao on the surface, and conversely, the substrate (CF substrate) 3 and the scribe line (press scribe part) Lbi on which the scribe line (press scribe part) Lai and the scribe line Lao are formed. The substrate (CF substrate) 3 in a state in which the substrate (TFT substrate) 2 on which the substrate is formed is pasted It goes without saying that it is not necessary to provide the scribe line Lb on the outer surface of the substrate (TFT substrate) 2 when the substrate (TFT substrate) 2 is divided together with the substrate (CF substrate) 3 in the step of performing. .

  In Embodiment 1 of the invention described above, an example in which the roller 23 is used has been described. Needless to say, a break bar (also referred to as a squeegee or a blade) may be used instead of the roller 23.

  FIG. 3 is a process diagram schematically showing another example of the method for manufacturing a liquid crystal display panel according to the present invention.

  When the liquid crystal display panel 1 is manufactured, first, as shown in FIG. 3A, a substrate (TFT substrate) 2 on which a TFT element is formed is manufactured, and a color filter is formed. The side substrate (CF substrate) 3 is manufactured.

  Next, the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are cleaned.

  Next, the alignment film 4 is printed on both the substrate (TFT substrate) 2 and the substrate (CF substrate) 3, and then both substrates are baked at about 200 degrees.

  The above steps are the same as the conventional method for manufacturing a liquid crystal display panel shown in FIG. 5. In this method for manufacturing a liquid crystal display panel, a substrate (TFT substrate) 2 and a substrate (CF substrate) 3 are bonded together. In this case, a scribe line (press scribe part) Lbi is formed on the surface (inner surface of the substrate (TFT substrate) 2) of the substrate (TFT substrate) 2 facing the surface of the substrate (CF substrate) 3. A scribe line (press scribe part) Lai is formed on the surface of the CF substrate 3 facing the surface of the substrate (TFT substrate) 2 (the inner surface of the substrate (CF substrate) 2).

  The scribe line (press scribe site) Lbi and the scribe line (press scribe site) Lai are formed using, for example, a laser irradiation means 21 and a laser beam.

  In addition, although the example which formed the scribe line (press scribe part) Lbi and the scribe line (press scribe part) Lai using the laser beam was shown here, the scribe line (press scribe part) Lbi and the scribe line (press scribe part) The part) Lai may be formed using a cutter.

  Next, for example, using a device in which a cloth is wound around a roller, each of the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 is rubbed in a predetermined direction, washed, and then cleaned. (CF substrate) The hair of the cloth adhering to each of the 3 is removed.

  Next, a portion for confining the liquid crystal is formed by screen printing.

  As the sealing material 5 for confining the liquid crystal, an adhesive (for example, an epoxy resin adhesive) or the like is used.

  In this adhesive, glass fiber is mixed in order to keep the thickness of the sealing material 5 constant.

  Next, when the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are bonded together, a conductive material for electrically connecting the counter electrode of the substrate (CF substrate) 3 to a specific portion of the substrate (TFT substrate) 2 (Carbon paste) (not shown) is adhered.

  In addition, the gap Sp between the substrate (TFT substrate) 2 and the substrate (CF substrate) 3, that is, plastic beads (spacers) 6 having a constant sphere diameter for keeping the thickness of the liquid crystal layer constant is dispersed. .

  Next, as shown in FIG. 3B, the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are bonded to each other at a predetermined interval. More specifically, after the substrate (TFT substrate) 2 and the substrate (CF substrate) 3 are bonded to each other at a predetermined interval, the sealing material 5 is heated and cured under pressure.

  Next, as shown in FIG. 3C, a scribe line Lao is formed on the outer surface of the substrate (CF substrate) 3 by using the laser irradiation means 21 and a laser beam.

  At this time, the vicinity of the scribe line Lao of the substrate (CF substrate) 3 is heated by the laser beam, but water or other coolant is sprayed around the heated scribe line Lao with a spray or the like, and rapidly cooled. The substrate (CF substrate) 3 is divided into a predetermined size using thermal stress strain.

  Thereafter, as shown in FIG. 3D, a scribe line Lbo is formed on the outer surface of the substrate (TFT substrate) 2 using the laser irradiation means 21 and a laser beam.

  At this time, the vicinity of the scribe line Lbo of the substrate (TFT substrate) 2 is heated by the laser beam. However, water or other coolant is sprayed around the heated scribe line Lbo with a spray or the like, and rapidly cooled. The substrate (TFT substrate) 2 is divided using thermal stress strain.

  Through the above process, at this stage, the pair of substrates (TFT substrate 2 and CF substrate 3) is divided into the panel size of the liquid crystal display.

  In the above liquid crystal display panel manufacturing method, first, the scribe line Lao is formed on the substrate (CF substrate) 3, and the substrate (CF substrate) 3 on which the scribe line Lao is formed is divided into a predetermined size. Although the example in which the scribe line Lbo is formed on the substrate (TFT substrate) 2 and the substrate (TFT substrate) 2 on which the scribe line Lbo is formed is divided is shown, the scribe line Lbo is formed on the substrate (TFT substrate) 2 first. Then, after the substrate (TFT substrate) 2 on which the scribe line Lbo is formed is divided into a predetermined size, the scribe line Lao is formed on the substrate (CF substrate) 3, and the substrate (CF substrate) 3 on which the scribe line Lao is formed is formed. It may be divided into a predetermined size.

  Thereafter, liquid crystal is injected by a vacuum injection method into the gap SP between the pair of substrates (TFT substrate and CF substrate) cut into a predetermined size as described above.

  After injecting liquid crystal into the gap SP between the substrate (TFT substrate) and the substrate (CF substrate), the liquid crystal injection port into which the liquid crystal has been injected is sealed with a sealing material (for example, an ultraviolet curable resin), and a liquid crystal display panel 1 is produced.

  Thereafter, the liquid crystal display panel 1 manufactured by the above steps is washed, and the liquid crystal or the like attached to the periphery of the liquid crystal display panel 1 is washed away.

  Thereafter, the polarizing film 7 is attached to the glass surface of the liquid crystal display panel 1 with care so that dust does not enter between the glass and the polarizing film 7.

  Thereafter, a backlight is provided on the back surface of the liquid crystal display panel 1 to produce a liquid crystal display.

  In this method of manufacturing the liquid crystal display panel 1, the scribe lines for dividing the pair of substrates (TFT substrate 2 and CF substrate 3) into a predetermined size are not limited to the outer surfaces of each of the pair of mother glasses (the scribe lines Lao and Scribe line Lbo), and scribe lines (press scribe part) Lai and scribe line (press scribe part) Lbi are also formed on the inner surface side of each of the pair of mother glasses 2 and 3. Therefore, when the pair of substrates (TFT substrate 2 and CF substrate 3) is divided into a predetermined size, the cut surfaces of the pair of substrates (TFT substrate 2 and CF substrate 3) are cracked or chipped. Can be suppressed.

  In this liquid crystal display panel manufacturing method, the press scribe line provided on the inner surface of at least one of the pair of substrates (TFT substrate 2 and CF substrate 3) and the scribe line provided on the outer surface are aligned. Thus, when at least one of the pair of substrates is divided into a predetermined size, the occurrence of cracks in an unexpected direction is suppressed, and a desired cut surface is formed.

In the method of manufacturing the liquid crystal display panel 1, an example in which scribe lines are provided on the inner surfaces of both the pair of substrates (TFT substrate 2 and CF substrate 3) has been shown (scribe line (press scribe part) Lai and Scribe line (press scribe part) Lbi), and a scribe line is provided only on one inner surface of a pair of substrates (TFT substrate 2 and CF substrate 3), and both outer surfaces of a pair of mother glasses 2 and 3 A method for manufacturing a liquid crystal display panel provided with a scribe line is also included in the method for manufacturing a liquid crystal display panel according to the present invention.
In such a liquid crystal display panel manufacturing method, a scribe line for dividing a pair of substrates (TFT substrate 2 and CF substrate 3) into a predetermined size is formed on at least one of the pair of substrates (TFT substrate 2 and CF substrate 3). Not only the outer surface (see scribe line Lbo or scribe line Lao) of the substrate (TFT substrate 2 or CF substrate 3) but also the inner surface (scribe line (press scribe part) Lbi or scribe line (press scribe line). Therefore, when dividing at least one of the pair of substrates (TFT substrate 2 and CF substrate 3 (TFT substrate 2 or CF substrate 3) into a predetermined size), the substrate is broken into divided sections. The occurrence of chipping can be suppressed.

  Further, referring to FIG. 1B, the cut surface of the substrate of the liquid crystal display panel 1 manufactured in the first and second embodiments of the present invention is clearly shown in FIG. The liquid crystal display panel 1 includes at least one of a pair of substrates (TFT substrate 2 and CF substrate 3) (in this example, the outer surface S2o side and the inner surface S2i side of the cut surface of the substrate (TFT substrate 2)). Rib marks R are formed on both sides.

  In addition, the area | region shown by MC in FIG.1 (b) is a mechanical crack area | region formed when the scribe line Lao was formed in the outer surface of mother glass using a cutter, The area | region shown by T is This is a region of traces generated when the substrate is divided into a predetermined size.

  In the mechanical crack region MC, when a scribe line is formed using a laser beam, a cutting line formed by the laser beam (usually referred to as a blind line) cannot be recognized.

  In addition, here, the description has focused on the configuration of the cut surface of the substrate (TFT substrate), but in the case where scribe lines are provided on both the inner surface side and the outer surface side of the substrate (CF substrate), Rib marks are also formed on the outer surface side and the inner surface side of the cut surface on the substrate (CF substrate) side.

  Further, rib marks R are provided on both the outer surface S2o side and the inner surface S2i side of the cut surface of at least one substrate (in this example, the substrate (TFT substrate) 2) of the pair of substrates (TFT substrate 2 and CF substrate 3). Any liquid crystal display panel that is formed is included in the liquid crystal display panel according to the present invention.

FIG. 1 is a diagram schematically illustrating a configuration of a liquid crystal display panel according to the present invention, and FIG. 1A is a cross-sectional view schematically illustrating a configuration of a liquid crystal display panel according to the present invention, and FIG. FIG. 2B is a side view schematically showing a state in which the liquid crystal display panel shown in FIG. 1A is viewed from the substrate (TFT substrate) in the arrow direction shown in FIG. It is process drawing which shows typically an example of the manufacturing method of the liquid crystal display panel which concerns on this invention. It is process drawing which shows typically another example of the manufacturing method of the liquid crystal display panel which concerns on this invention. FIG. 4A is a diagram schematically illustrating the configuration of a conventional liquid crystal display panel, FIG. 4A is a cross-sectional view schematically illustrating the configuration of a conventional liquid crystal display panel, and FIG. 4A is a side view schematically showing a state in which the liquid crystal display panel shown in FIG. 4A is viewed from the substrate (TFT substrate) in the arrow direction shown in FIG. It is process drawing which shows typically an example of the manufacturing method of the conventional liquid crystal display panel.

Explanation of symbols

1 Liquid crystal display panel 2 Substrate (TFT substrate)
3 Substrate (CF substrate)
Lai, Lbi scribe line (press scribe part)
Lao, Lbo scribe line R rib mark

Claims (6)

A method of manufacturing a liquid crystal display panel in which a liquid crystal is sandwiched between a pair of substrates, wherein a predetermined portion on the inner surface of at least one of the pair of substrates is pressed and a predetermined portion on the outer surface. A method of manufacturing a liquid crystal display panel in which at least one of the pair of substrates is divided into a predetermined size according to the prescribe portion and the scribe portion. The method for manufacturing a liquid crystal display panel according to claim 1, wherein a press scribe portion provided on an inner surface of at least one of the pair of substrates and a scribe portion provided on an outer surface are provided so as to be aligned. The manufacturing method of the liquid crystal display panel of Claim 1 or Claim 2 which performs the said press scribe and the said scribe by the method of using a cutter or a laser beam. The method for manufacturing a liquid crystal display panel according to claim 1, wherein the press scribe and the scribe are formed by different methods. A liquid crystal display panel in which rib marks are formed on both an outer surface side and an inner surface side of at least one cut surface of a pair of substrates forming the liquid crystal display panel. 6. The liquid crystal display panel according to claim 5, wherein rib marks formed on both the outer surface side and the inner surface side of at least one cut surface of the pair of substrates forming the liquid crystal display panel are different.

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