JP2006276372A - Liquid crystal display panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display panel whose manufacturing yield is improved and its manufacturing method. <P>SOLUTION: The liquid crystal display panel 1 is equipped with a pair of substrates 10 and 20 which are provided with various electrodes, an alignment film 35, etc., on surfaces, a sealing material 31 which is arranged at the peripheral parts of the pair of substrates and stick the surfaces of the pair of substrates together opposite each other, a liquid crystal injection hole 32 which is formed by boring a portion of the sealing material, liquid crystal injected into the space formed of the pair of substrates and the sealing material, and a sealing agent 33 sealing the liquid crystal injection hole. The liquid crystal injection hole 32 is formed between the lengthwise center part and one end part of one flank 13a of the substrates 10 and 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display panel and a method for manufacturing the same, and more particularly, to a liquid crystal display panel having an improved manufacturing yield of the liquid crystal display panel and a method for manufacturing the same.

  2. Description of the Related Art In recent years, thin and power-saving liquid crystal display devices are rapidly spreading in various applications as display devices that replace conventional cathode ray tube displays. A liquid crystal display panel used in this liquid crystal display device is formed by bonding a pair of substrates made of glass or the like with a sealing material made of epoxy resin or the like facing each other, injecting liquid crystal therein, and then setting the injection port with an ultraviolet curable resin. Or it manufactures by sealing with the sealing material which consists of thermosetting resins etc.

  In such a method of manufacturing a liquid crystal display panel, various methods for injecting liquid crystal into a space formed by a substrate and a sealing material have been devised, and have been introduced in patent literature (for example, the following patent literature 1). reference).

FIG. 4 is a diagram showing a liquid crystal injection process of the liquid crystal display of Patent Document 1 below. In the liquid crystal display 100 disclosed in the following Patent Document 1, as shown in FIG. 4, the first and second substrates 101 and 102 are opposed to each other with a gap therebetween, and the peripheral edges are bonded to each other. The first and second substrates 101 and 102 are accommodated in the liquid crystal injection chamber 130 in a state where the sub injection port 111 is not in contact with the liquid crystal tank 120 while being immersed in the tank 120, and the injection treatment is performed in the liquid crystal injection chamber 130. The outside of the first and second substrates 101 and 102 is hermetically held by the tool, the pressure on the liquid crystal injection port 110 side is made higher than that on the sub injection port 111 side, and the liquid crystal 121 is injected into the empty cell 101. .
JP-A-6-180457 (FIG. 1, paragraph [0018]) JP-A-5-61054

  As shown in Patent Document 1, liquid crystal is injected into a liquid crystal display panel by immersing a liquid crystal injection port in a liquid crystal tank filled with liquid crystal. At the time of this injection, a method of injecting by emptying the inside of an empty cell, a method of injecting by providing a sub-injection port part and creating a pressure difference between the two injection ports as shown in Patent Document 1, or Since the cell is a fine gap, there is a method of injecting by utilizing a capillary phenomenon. However, regardless of which method is used, in this liquid crystal injection step, it is necessary to immerse the liquid crystal injection port in the liquid crystal tank.

  Patent Document 2 discloses a liquid crystal display element in which a liquid crystal injection port is provided at the center of one side surface of a substrate. Like this liquid crystal display element, the one with the liquid crystal injection port provided at the center of one side of the substrate has the best liquid crystal injection efficiency because the liquid crystal is drawn into the empty cell in the liquid crystal injection process. However, when liquid crystal is injected by immersing the liquid crystal inlet in the liquid crystal tank as described above, it is necessary to immerse the entire side surface provided with the liquid crystal inlet in the liquid crystal tank. One side that was immersed in the tank when the liquid crystal inside the tank was contaminated by dust attached to the immersed side of the liquid crystal display panel or when the liquid crystal display panel was pulled up from the liquid crystal tank after the liquid crystal injection was completed In other words, the liquid crystal is taken out in a state where a large amount of the liquid crystal is attached to the liquid crystal, and expensive liquid crystal is wasted.

  In addition, a liquid crystal display panel with a liquid crystal injection port provided in the center of the panel, for example, when stress is applied to the panel from the plane direction, the pressure acts directly on the liquid crystal injection port, thereby peeling off the sealing material. There is a fear.

  Furthermore, some liquid crystal display panels have driver LSIs built on a substrate, such as a low temperature poly-silicon (LTPS) type liquid crystal panel. When injecting liquid crystal, the space between the substrate end face and the sealing material is relatively wide in order to mount the driver LSI. There are cases where the driver LSI crawls up to the mounting position of the driver LSI due to a capillary phenomenon, and the driver LSI is damaged by the scooped liquid crystal.

  In order to solve such a problem, as in the liquid crystal display disclosed in Patent Document 1, a liquid crystal injection port is formed at the end of the substrate to reduce the area immersed in the liquid crystal tank. In some cases, the liquid crystal in the liquid crystal tank is prevented from being contaminated and a large amount of liquid crystal is taken out, and the driver LSI is prevented from being damaged by increasing the distance from the liquid crystal inlet to the driver LSI.

  However, for example, in the case of manufacturing a small liquid crystal display panel, generally, a plurality of panel regions are generally formed on a large mother substrate, and various processing steps are performed collectively on the mother substrate. . When liquid crystal is injected in such a small liquid crystal display panel, since injection can be performed at one time, liquid crystal injection and liquid crystal injection are performed on a strip-like mother substrate in which panel regions before being divided into individual panel regions are arranged in a line. The inlet can be sealed. When the liquid crystal is injected and the liquid crystal injection port is sealed by this method, the liquid crystal injection and the liquid crystal injection are performed when the liquid crystal injection port is provided at the end of the substrate as in the liquid crystal display disclosed in Patent Document 1. After the entrance is sealed, when it is divided into a plurality of panel regions, the sealing material sealing the liquid crystal injection port provided in the corner often overlaps the scribe line. In some cases, it becomes difficult to divide or the substrate is chipped.

  In view of the above-mentioned problems, the present inventors can perform liquid crystal injection satisfactorily and improve the division even when dividing into a plurality of panel regions after liquid crystal injection and liquid crystal injection port sealing. As a result of various examinations of a liquid crystal display panel that can be performed and a method for manufacturing the same, the present inventors have found that all of the above problems can be solved by devising the installation position of the liquid crystal injection port.

  That is, an object of the present invention is to provide a liquid crystal display panel and a method for manufacturing the liquid crystal display panel with improved manufacturing yield of the liquid crystal display panel.

In order to achieve the above object, a liquid crystal display panel according to claim 1 of the present application includes a pair of substrates provided with various electrodes and an alignment film on a surface thereof, and the above-described liquid crystal display panel disposed in a peripheral portion of the pair of substrates. A sealing material that is bonded with the surfaces of a pair of substrates facing each other, a liquid crystal injection port formed by opening a part of the sealing material, and a space formed by the pair of substrates and the sealing material. A liquid crystal display panel comprising a liquid crystal and a sealing material for sealing the liquid crystal injection port,
The liquid crystal injection port is formed between a longitudinal center portion and one end portion of one side surface of the substrate.

  The invention according to claim 2 relates to the liquid crystal display panel according to claim 1, wherein the liquid crystal injection port is located at a position 5 to 10 mm away from one longitudinal end portion of one side surface of the pair of substrates. It is provided so that the center part of the said inlet may be located.

  The invention according to claim 3 relates to the liquid crystal display panel according to claim 1 or 2, wherein one of the pair of substrates is close to a side surface facing one side surface where the liquid crystal injection port is provided. A driver LSI for driving the liquid crystal is mounted at the position where the liquid crystal is mounted.

5. The method of manufacturing a liquid crystal display panel according to claim 4, wherein a pair of strip-shaped mother substrates each having a plurality of panel regions arranged in a row are opposed to each other, and a liquid crystal injection port provided on one long side of the mother substrate. Applying a sealing material so as to cover the peripheral portion of the panel area excluding
Bonding the pair of mother substrates with the sealing material;
Injecting liquid crystal from the liquid crystal injection port;
Sealing the liquid crystal injection port with a sealing material after injecting liquid crystal into the panel region;
A step of dividing the pair of mother substrates formed by the respective steps into the panel regions;
A liquid crystal display panel manufacturing method comprising:
The liquid crystal injection port formed in the sealing material application step is formed between a central portion and one end portion in the longitudinal direction of one side surface of the panel region.

  The invention according to claim 5 relates to the method of manufacturing a liquid crystal display panel according to claim 4, wherein the liquid crystal injection port is spaced 5 to 10 mm from one end in the longitudinal direction on one side surface of the panel region. It is provided so that the center of the injection port is located at a position.

  The invention described in claim 6 relates to the method of manufacturing a liquid crystal display panel according to claim 4 or 5, wherein the liquid crystal injection port of the panel region is provided on one of the pair of mother substrates. A driver LSI for driving liquid crystal is mounted at a position close to the side surface facing one side surface.

  By providing the above configuration, the present invention has the following excellent effects. That is, according to the first aspect of the present invention, since the liquid crystal injection port is provided between the longitudinal center portion and one end portion of one side surface of the substrate, the liquid crystal display panel is a small-sized liquid crystal display panel. In this case, the sealing material is not formed even at the end of the substrate, and a liquid crystal display panel with a good manufacturing yield can be provided, and the liquid crystal injection port is provided at a position other than the central portion, so that the plane direction of the panel The liquid crystal display panel can be provided in which the pressure is not directly applied to the liquid crystal injection port directly against the stress from the liquid crystal, and the liquid crystal leakage or the like hardly occurs.

  According to the invention of claim 2, the position where the sealing material does not reach the end of the side surface of the substrate and is close to the end is preferably 5 to 10 mm away from the end, more preferably the end. A position 8 mm away from the part is good.

  According to the invention of claim 3, in addition to the effect of claim 1, it is possible to provide a liquid crystal display panel in which the driver LSI is not damaged even in the liquid crystal display panel in which the driver LSI is mounted on the substrate.

  According to the invention of claim 4, even when a liquid crystal display panel is manufactured from a mother substrate having a plurality of panel regions, the liquid crystal injection port is formed between the central portion and one end portion in the longitudinal direction of one side surface of the substrate. Therefore, it is possible to prevent unnecessary liquid crystal from being taken out at the time of liquid crystal injection, and it is possible to suppress disconnection failure and chipping of the substrate because the sealing material does not overlap the scribe line even when the panel area is divided. it can.

  Moreover, according to invention of Claim 5, 6, the manufacturing method of the liquid crystal display panel which has the effect of Claim 2, 3 can be provided.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings. However, the embodiment shown below exemplifies a liquid crystal display panel and a manufacturing method thereof for embodying the technical idea of the present invention, and is not intended to specify the present invention. Other embodiments within the scope of the claims are equally applicable. In the following embodiments, a COG (Chip On Glass) type liquid crystal display panel in which a driver LSI is mounted on a substrate will be described.

  1 is a plan view of a liquid crystal display panel according to an embodiment of the present invention, FIG. 2 is a plan view showing a mother substrate including a plurality of panel regions of the array substrate of the liquid crystal display panel of FIG. 1, and FIG. It is a top view which shows one of several panel area | regions.

  The liquid crystal display panel 1 of the present invention is, for example, a small-sized liquid crystal display panel, which is applied to a pair of rectangular glass substrates 10 and 20 and a peripheral portion of the pair of glass substrates 10 and 20, and both substrates are pasted. A sealing material 31 made of an epoxy resin to be worn, a liquid crystal injection port 32 formed by opening a part of the sealing material 31, a sealing material 33 for sealing the liquid crystal injection port 32, and one glass A rectangular plate-like body having a pair of short sides 1a, 1b and long sides 1c, 1d which are placed on one side of the substrate 10 and which drives the liquid crystal display panel 1 and which drives the liquid crystal display panel 1, The part is a display area 34.

  Of the pair of glass substrates 10 and 20, one glass substrate 10 is an array substrate provided with driving wiring and transparent electrodes on its surface, and the other glass substrate 20 has a color filter layer on its surface. And a color filter substrate on which common electrodes and the like are formed. Further, the array substrate 10 has one side surface extended by a predetermined length as compared with the color filter substrate 20, and a driver LSI 30 is mounted on the extended portion.

  Next, a method for manufacturing the liquid crystal display panel 1 will be described below with reference to FIGS. The array substrate 10 and the color filter substrate 20 of the liquid crystal display panel 1 of the present invention are each formed from a large mother substrate. Therefore, FIG. 2 illustrates the mother substrate M1 on the array substrate 10 side.

  The mother substrate M1 for forming the array substrate 10 is provided with a plurality of panel regions 10a to 10d for forming the array substrate 10. Note that four panel regions of the array substrate 10 are formed in parallel in the horizontal direction on the mother substrate M1 of FIG.

  First, a plurality of panel regions 10a to 10d are formed on the mother substrate M1, and the panel regions 10a to 10d are partitioned by scribe lines 15. On the plurality of panel regions 10a, as shown in FIG. 3, first, transparent electrodes made of ITO (Indium Tin Oxide) are patterned in a matrix to form scanning lines and signal lines. An active switching element made of a thin film transistor (TFT) or the like is formed near the intersection of the scanning line and the signal line, and a pixel electrode is formed in a region surrounded by the scanning line and the signal line. The The transparent electrode is routed to the driver placement area 11 where the driver LSI 30 provided at a position adjacent to one short side 13b of the panel area is placed by wiring, and the driver LSI 30 placed in this area 11 is placed. Thus, a drive voltage is supplied. 3 is a panel alignment mark for positioning the panel region 10a.

  Next, an alignment film 35 made of polyimide or the like is applied and baked on the transparent electrode or the like disposed by the above process. Then, after the surface is rubbed, a sealing material 31 is applied to the periphery of the panel region so as to cover the alignment film. When the sealing material 31 is applied, after the mother substrate M1 is bonded to the color filter substrate-side mother substrate (not shown), a liquid crystal injection port 32 for injecting liquid crystal therein is provided in the panel region 10a. Of these sides 13a to 13d, the driver placement region 11 is formed at a position adjacent to the short side 13a that is not provided in the vicinity thereof.

  The liquid crystal injection port 32 formed in the sealing material 31 application step is provided between the central portion of the short side 13a and one end thereof. More specifically, it is provided at a position away from one end of the short side 13a by a predetermined distance L1. This distance L1 is longer than at least half of the application width L2 of the sealing material 33 shown in FIG. 1, and more specifically, for example, in a liquid crystal display panel having a diagonal size of 2 inches, the application width L2 of the sealing material 33 is longer. Since both are about 10 mm, 5-10 mm is preferable, and it is 8 mm desirably.

  The mother substrate M1 to which the sealing material 31 is applied in the above-described process has the same panel region, the counter electrode and the color filter layer are formed on the surface thereof, and the color filter substrate side mother on which the spacer is disposed. Affixed to face the substrate. Note that the color filter substrate-side mother substrate does not need to be provided with the driver placement region 11, and is accordingly smaller than the array substrate-side mother substrate M1.

  In the panel assembly formed by bonding a pair of mother substrates, the liquid crystal injection port 32 is then immersed in a liquid crystal tank filled with liquid crystal in the same manner as the conventional one, whereby liquid crystal is displayed in the display region 34. Inject. In this injection method, for example, capillary action is used. Moreover, in this liquid crystal injection process, it is preferable to reduce the area immersed in the liquid crystal tank of the panel assembly as much as possible. When removing the liquid crystal from the liquid crystal tank after the liquid crystal has been sealed, the panel assembly is inclined obliquely (the one long side 13c and the short side 13b in the panel region 10a in FIG. 3 are on the upper side). And take out the unnecessary liquid crystal adhering to the side edge of the panel.

  After the liquid crystal injection is completed by the above process, the panel assembly is pressurized from both the display surface and the back surface thereof to make the internal liquid crystal uniform and discharge the extra liquid crystal, and then each of the panel regions 10a to 10d. The liquid crystal injection port 32 is sealed with a sealing material 33. Then, the panel assembly in which the liquid crystal injection port 32 is sealed is divided along the scribe line 15 for each of the panel regions 10a to 10d to complete the liquid crystal display panel 1.

  As described above, in the liquid crystal display panel 1 manufactured by the above steps, the liquid crystal is provided in the vicinity of the short side of the short side 13a away from the driver placement region 11 in the liquid crystal injection step. It is possible to prevent the liquid crystal from being damaged due to contact with the liquid crystal and to reduce the loss of liquid crystal. Further, since the position of the liquid crystal injection port 32 is separated from one end of the short side 13a by a distance L1 longer than the half of the coating width L2 of the sealing material 33, the sealing material overlaps the scribe line 15. Therefore, it is possible to easily cut the substrate and to suppress the chipping of the substrate.

  In the above embodiment, the mother substrate is described in which the panel region is provided in a row in the horizontal direction. For example, the liquid crystal display panel is formed by a mother substrate in which a plurality of panel regions are provided in the horizontal direction and the vertical direction. When manufactured, a plurality of strip-shaped mother substrates are obtained by dividing only one scribe line (for example, in the vertical direction) so that the liquid crystal injection port is exposed at the end of the liquid crystal injection process. Later, liquid crystal is injected.

FIG. 1 is a plan view of a liquid crystal display panel according to an embodiment of the present invention, 2 is a plan view showing a mother substrate including a plurality of panel regions of the array substrate of the liquid crystal display panel of FIG. FIG. 3 is a plan view showing one of the plurality of panel regions of FIG. FIG. 4 is a diagram showing a liquid crystal injection process of a conventional liquid crystal display.

Explanation of symbols

1 Liquid crystal display panel M1 Mother substrate 10 Array substrate (glass substrate)
10a to 10d Panel area 11 Driver mounting area 12 Panel alignment marks 13a and 13b Short side 13c and 13d Long side 20 Color filter substrate (glass substrate)
30 Driver LSI
31 Sealing material 32 Liquid crystal injection port 33 Sealing material 34 Display area 35 Alignment film

Claims (6)

A pair of substrates provided with various electrodes, alignment films, and the like on the surface; a sealing material that is attached so that the surfaces of the pair of substrates disposed on the periphery of the pair of substrates face each other; and one of the sealing materials A liquid crystal display panel comprising: a liquid crystal injection port formed by opening a portion; a liquid crystal injected into a space formed by the pair of substrates and a sealing material; and a sealing material for sealing the liquid crystal injection port. There,
The liquid crystal display panel according to claim 1, wherein the liquid crystal injection port is formed between a central portion in the longitudinal direction and one end portion on one side surface of the substrate.   2. The liquid crystal injection port is provided so that a central portion of the injection port is located at a position 5 to 10 mm away from one longitudinal end portion of one side surface of the pair of substrates. A liquid crystal display panel as described in 1.   The driver LSI for driving the liquid crystal is mounted on one of the pair of substrates at a position close to a side surface facing the one side surface on which the liquid crystal injection port is provided. 2. A liquid crystal display panel according to 2. A pair of strip-shaped mother substrates each having a plurality of panel regions provided in a row are opposed to each other, and a sealing material is provided so as to cover a peripheral portion of the panel region excluding a liquid crystal injection port provided on one long side of the mother substrate. A step of applying
Bonding the pair of mother substrates with the sealing material;
Injecting liquid crystal from the liquid crystal injection port;
Sealing the liquid crystal injection port with a sealing material after injecting liquid crystal into the panel region;
A step of dividing the pair of mother substrates formed by the respective steps into the panel regions;
A liquid crystal display panel manufacturing method comprising:
The method of manufacturing a liquid crystal display panel, wherein the liquid crystal injection port formed in the sealing material application step is formed between a central portion and one end portion in the longitudinal direction of one side surface of the panel region.   The liquid crystal injection port is provided so that a central portion of the injection port is located at a position 5 to 10 mm away from one end portion in the longitudinal direction on one side surface of the panel region. The manufacturing method of the liquid crystal display panel of description.   One of the pair of mother substrates is mounted with a driver LSI for driving liquid crystal at a position close to a side surface of the panel region facing the one side surface where the liquid crystal injection port is provided. The manufacturing method of the liquid crystal display panel of Claim 4 or 5.

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