JPS62147426A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE:To precisely divide elements or remove unnecessary side parts along scribing lines by cutting glass substrates by the pressing force exerted thereto while heating an org. adhesive agent to form empty cells and injecting a liquid crystal into such empty cells by a vacuum method or the like then sealing the injection ports. CONSTITUTION:Two sheets of glass substrates are superposed via the epoxy adhesive agent as a cell forming seal intervened therebetween and are heated for 90min at 150 deg.C to cure the adhesive agent, by which the cell is constituted. The scribing lines for dividing the elements or removing the unnecessary parts are thereafter formed by a diamond wheel, etc., then the pressing force is exerted to the glass substrates to cut the substrates to the individual empty cells while the org. adhesive agent is directly or indirectly heated. After the liquid crystal is injected into such empty cells by the vacuum method, etc., the injection ports are sealed. The glass substrates are thereby precisely cut along the scribing lines and the merchandise value as the liquid crystal display element is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method of manufacturing a liquid crystal display element, and particularly to a step of dividing cells into individual cells or cutting off unnecessary sides.

(Prior art) A cell is constructed by overlapping two glass substrates on which transparent electrodes have been adhered and oriented on the surfaces that will become the inner surface of the cell, with a frame-shaped sealant interposed between them. When liquid crystal is injected through the injection port (a cutout in a portion of the sealant) using a vacuum method, etc., and the injection port is then sealed to obtain a liquid crystal display element, empty cells for many elements are created at the same time. In some cases, it is necessary to divide the cell into individual element cells, and unnecessary parts around the periphery must be cut out.

To perform such division or cutting, scribe lines are provided using a diamond wheel or the like, and then a pressing force is applied to the glass substrate.

However, since this process of applying pressure to the glass substrate and cutting it along the scribe line is done at room temperature, a sealant (such as an adhesive using epoxy resin) is present at the cut part. As a result, cutting in and around that area will not be carried out along the scribe line, and the cut surface will become uneven and the appearance will be impaired.

(Objective of the Invention) An object of the present invention is to provide a method for manufacturing a liquid crystal display element that can accurately divide the element or cut off unnecessary sides along scribe lines.

(Summary of the Invention) The present invention produces cells by laminating at least two glass substrates on which transparent electrodes have been adhered and which have been subjected to an orientation treatment, with an organic adhesive for cell formation such as an epoxy adhesive interposed therebetween. After structuring, scribe lines for dividing the element or cutting out unnecessary sides are formed using a diamond wheel or the like, and then cutting is performed by applying pressing force to the glass substrate while directly or indirectly heating the organic adhesive. The method is characterized in that a liquid crystal is injected into each empty cell by a vacuum method or the like, and then the injection port is sealed.

(Embodiment) First, at least two glass substrates on which transparent electrodes have been adhered and which have been subjected to orientation treatment are stacked together with an organic adhesive for cell formation such as epoxy adhesive interposed therebetween, and then heated and cured. Configure cells.

Next, scribe lines are formed using a diamond wheel or a super steel wheel to divide the element and cut out unnecessary edges. After that, the organic adhesive is heated at 30 to 100° using a heating furnace, an infrared lamp, or a laser beam.
Heat to C.

Then, when a pressing force is applied to the substrate surface in this heated state (for example, when taken out from the heating furnace and placed on a workbench at room temperature, the temperature may be higher than room temperature, for example, 30 to 100 ° C), Cut along the scribe line. That is, it is divided into empty cells for each element, and unnecessary sides are removed.

Thereafter, liquid crystal is injected into each empty cell through the injection port using a vacuum method or the like, and then the injection port is sealed to complete the liquid crystal display element.

Example A cell was constructed by stacking two glass substrates with an epoxy adhesive interposed therebetween as a cell-forming seal, and curing them by heating at 150° C. for 90 minutes. Then, a scribe line is formed using a diamond wheel on the center line of the seal on the side other than the terminal portion of the side substrate surface, and the product is placed in a constant temperature bath at 100'O for 30 minutes. Thereafter, the substrate was taken out and cut by pressing from both sides of the substrate.

This cutting was performed accurately along the scribe line on the center line of the seal, and an empty cell, ie, a liquid crystal display element, with a good appearance was obtained.

(Effects) As described above, according to the present invention, since the organic adhesive used as the sealant is heated and a pressing force is applied when it is in a soft state, the glass substrate can be accurately cut along the scribe line. This makes it possible to improve the appearance and increase the commercial value of the liquid crystal display element.

Patent applicant: Stanley Electric Co., Ltd.-2

Claims (1)

[Claims] After forming a cell by overlapping at least two glass substrates on which transparent electrodes have been adhered and which have been subjected to an orientation treatment, with an organic adhesive for cell formation such as an epoxy adhesive interposed therebetween,
A scribe line for dividing the element or removing unnecessary sides is formed using a diamond wheel or the like, and then pressing force is applied to the glass substrate while directly or indirectly heating the organic adhesive to cut the glass substrate into individual holes. 1. A method for manufacturing a liquid crystal display element, comprising: forming a cell, injecting liquid crystal into the empty cell by a vacuum method or the like, and then sealing an injection port.