JP2006284879A - Liquid crystal display element and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a liquid crystal remaining surface in a filling port smooth even when liquid crystal remaining nearby the filling port is cleaned by using an ultrasonic wave. <P>SOLUTION: A liquid crystal display element is constituted by sticking a pair of substrates together across a sealant provided with the filling port in a projection shape, and filling liquid crystal from the filling port, and the liquid crystal display element is characterized in that two sides of a projection part of the filling port are slant to the normal of the substrate end surface closest to the filling port and spreads in a chevron shape from the substrate end surface to the center. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a liquid crystal display element and a method for manufacturing the same.

  Conventionally, in a liquid crystal display element, the peripheral portions of a pair of substrates are sealed with a sealing agent, and liquid crystal is injected between the substrates from a liquid crystal injection port provided in the sealing agent, and then a sealing agent is applied to the liquid crystal injection port Thus, a sealed configuration is known. After the liquid crystal is injected from the liquid crystal injection port, the vicinity of the liquid crystal injection port, the end surface of the sealing agent, and the end surface of the substrate are wet with the liquid crystal. Therefore, after removing the liquid crystal in the vicinity of the liquid crystal injection port with a nonwoven fabric, blowing it off with air blow, or removing it by suction or the like, a sealing agent is applied to the liquid crystal injection port.

  In the conventional configuration, it is difficult to completely remove the liquid crystal in the vicinity of the liquid crystal injection port, and there is a slight gap between the end surface of the sealing agent and the sealing agent, or between the end surface of the substrate and the sealing agent. However, the liquid crystal is present. In addition, when there is a step between the end surface of the sealing agent and the end surface of the substrate, liquid crystal may accumulate in the step portion. And in these states, the adhesive force between the sealing agent and the sealing agent decreases due to the liquid crystal between the sealing agent and the sealing agent, and the sealing agent peels off due to external stress or the like, or A so-called leak path is created by the liquid crystal accumulated between the end surface of the sealing agent and the sealing agent, or between the end surface of the substrate and the sealing agent, and air and contaminants enter the inside of the substrate from the liquid crystal inlet. However, there is a problem that causes display defects.

As a technique for solving the above problem, the liquid crystal near the liquid crystal inlet is removed by ultrasonic cleaning by immersing the liquid crystal inlet near the liquid crystal display element in a solvent before sealing, and the portion where the liquid crystal is removed The manufacturing method of the liquid crystal display element made to harden | cure after being filled with sealing agent is disclosed.
For example, see Patent Document 1.

FIG. 3 is a schematic view showing a shape of a sealant in the vicinity of a liquid crystal injection port of a liquid crystal display element according to the prior art, and FIG. 4 is a top view after ultrasonic cleaning. In FIG. 3, reference numeral 1 denotes a first substrate, 2 denotes a second substrate, which is a transparent substrate, and the first substrate 1 and the second substrate 2 are bonded together with a sealant 3. A protruding portion that becomes the liquid crystal injection port 4 is formed in a part of the sealing agent 3 by the sealing agents 3a and 3b. The sealing agents 3a and 3b forming the protruding portions are formed perpendicular to the end surface 2a of the second substrate. When the space formed by the first substrate 1, the second substrate 2, and the sealant 3 is evacuated and the liquid crystal dropped in advance near the liquid crystal injection port 4 is heated and liquefied, the liquid crystal is filled into the space. The The amount of liquid crystal to be dropped is set to be slightly larger even if the space is filled, and remains in the vicinity of the liquid crystal injection port 4 as shown in FIG. As described above, the liquid crystal in the vicinity of the liquid crystal inlet is removed by immersing the liquid crystal inlet in the vicinity of the liquid crystal display element in a solvent and ultrasonically cleaning the liquid crystal before sealing.
JP 2004-258556 A

  In the liquid crystal display element, after the liquid crystal is injected (before sealing), the vicinity of the liquid crystal inlet is immersed in a solvent, and ultrasonic cleaning is performed until the vicinity of the liquid crystal inlet is sufficiently clean. The liquid crystal inside (4) is displaced. As shown in FIG. 4, the liquid crystal in the vicinity of the liquid crystal injection port 4 is removed, but the remaining surface of the liquid crystal is not a smooth surface as in 5a, and in particular, the vicinity of the wall surface of the sealant 3a may be removed. Many. Liquid crystals at room temperature have low fluidity, and in particular, ferroelectric liquid crystals have low fluidity. Therefore, it is assumed that they are generated by the propagation of ultrasonic waves for cleaning. Will not change.

  When the liquid crystal remaining surface has a shape as shown in 5a, the sealing agent does not adhere to the liquid crystal remaining surface 5a, and a space is generated between the sealing agent and the liquid crystal remaining surface 5a. The space may move in the liquid crystal display element, and when the space moves to the display pixel portion, a display defect occurs.

  In the liquid crystal display element, in which a pair of substrates are bonded through a sealant provided with a liquid crystal injection port having a protruding shape, and liquid crystal is injected from the liquid crystal injection port, each of the protrusions of the liquid crystal injection port A liquid crystal display element in which two sides are inclined with respect to the normal line of the substrate end surface closest to the liquid crystal injection port, and the two sides have a square shape and spread from the substrate end surface toward the center. .

  In order to solve the above-described problem, the method for manufacturing a liquid crystal display element of the present invention has at least two sides of the protruding portion of the liquid crystal injection port closest to the liquid crystal injection port on one of the pair of substrates. Forming a sealing agent that is inclined with respect to the normal of the substrate end face and has two sides in the shape of a letter C and extends from the end face of the substrate toward the center; A liquid crystal display element comprising: a step of bonding through a liquid crystal; a step of injecting liquid crystal from the liquid crystal injection port; a step of immersing the vicinity of the liquid crystal injection port in a solvent; and a step of ultrasonically cleaning; Let it be a manufacturing method.

  According to the liquid crystal display element and the manufacturing method of the present invention, the vicinity of the liquid crystal inlet is immersed in a solvent after the liquid is injected, and the ultrasonic cleaning is performed until the liquid crystal in the vicinity of the liquid crystal inlet is sufficiently removed. Therefore, no space is formed inside the liquid crystal display element, and the sealing quality can be improved.

  A feature of the embodiment of the present invention is that two sides of each protrusion of the liquid crystal injection port are inclined with respect to the normal line of the substrate end surface closest to the liquid crystal injection port, and the two sides are cross-shaped. It is in a shape that spreads from the substrate end surface toward the center.

  Hereinafter, the manufacturing method of the liquid crystal display element according to the present invention will be described together with the description of the liquid crystal display element according to the present invention. FIG. 1 is a top view schematically showing a sealant shape in the vicinity of a liquid crystal inlet of a liquid crystal display device according to the present invention. Reference numeral 1 denotes a first substrate, 2 denotes a second substrate which is a transparent substrate, and the first substrate 1 and the second substrate 2 are bonded to each other with a sealing agent 6 formed on one substrate. Protrusions that serve as the liquid crystal injection ports 4 are formed in a part of the sealing agent 6 by the sealing agents 6a and 6b. The sealing agents 6a and 6b forming the protrusions are inclined with respect to the normal A of the end surface 2a of the second substrate 2 where the liquid crystal injection port 4 is formed, and the two sides (6a and 6b) are It has a letter shape and is formed in a shape spreading from the end face 2a toward the center. The space formed by the first substrate 1, the second substrate 2, and the sealant 6 is evacuated, the liquid crystal dripped in the vicinity of the liquid crystal injection port 4 is heated, and the liquid crystal 5 is injected as in the prior art. It is.

  The liquid crystal display element into which the liquid crystal has been injected is vertically oriented so that the liquid crystal injection port 4 faces upward, soaked in a solvent, and subjected to ultrasonic waves. At that time, the liquid crystal injection port 4 is completely hidden in the liquid.

  As the solvent, semiconductor grade IPA is used, and as the ultrasonic cleaning apparatus, “Ultrasonic Cleaning Machine UT-205 manufactured by SHARP” is used. The ultrasonic cleaning conditions were 80% output and 4 minutes 30 seconds.

  FIG. 2 is a top view of the vicinity of the liquid crystal inlet after the ultrasonic cleaning according to the present invention. In the case of a conventional projecting portion (liquid crystal inlet) shape in which the two sides of the projecting portion of the liquid crystal inlet 4 are not inclined with respect to the normal A of the substrate end surface 2a closest to the liquid crystal inlet 4 As compared with the above, it can be seen that the liquid crystal remaining surface 5b is flat, and in particular, no pitting occurs near the inner wall surface of the sealant 6a.

  In FIG. 1, the sealing agents 6 a and 6 b are inclined, but it goes without saying that the inner walls of the sealing agents 6 a and 6 b are substantially inclined (including curved lines) and have a square shape.

The top view with the schematic diagram which shows the sealing agent shape of the liquid crystal inlet vicinity of the liquid crystal display element by this invention Top view near the liquid crystal inlet after ultrasonic cleaning according to the present invention. A top view with a schematic diagram showing the shape of the sealant near the liquid crystal inlet of a liquid crystal display device according to the prior art Top view after ultrasonic cleaning

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 2a 2nd board | substrate end surface 3 Sealing agent 3a Protrusion part sealing agent 3b Protrusion part sealing agent 4 Liquid crystal injection port 5 Liquid crystal 5a Liquid crystal residual surface 5b Liquid crystal residual surface 6 Sealing agent 6a Protrusion part sealing agent 6b Protrusion Sealant

Claims (2)

  In the liquid crystal display element, in which a pair of substrates are bonded through a sealant provided with a liquid crystal injection port having a protruding shape, and liquid crystal is injected from the liquid crystal injection port, each of the protrusions of the liquid crystal injection port Two sides are inclined with respect to a normal line of a substrate end surface closest to the liquid crystal injection port, and the two sides are shaped like a letter C and are spread from the substrate end surface toward the center. Liquid crystal display element.   At least two sides of the protrusion of the liquid crystal injection port on at least one of the pair of substrates are inclined with respect to the normal line of the end surface of the substrate closest to the liquid crystal injection port, and the two sides are cross-shaped. Forming a sealing agent spreading in shape from the substrate end surface toward the center, bonding a pair of substrates through the sealing agent, injecting liquid crystal from the liquid crystal injection port, and liquid crystal A method of manufacturing a liquid crystal display element, comprising: a step of immersing the vicinity of the inlet in a solvent and ultrasonically cleaning; and a step of sealing the inlet.

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