JP2715067B2 - Liquid crystal device manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal device . [0002] In a conventional method of manufacturing a liquid crystal device , a spacer seal is a thermosetting adhesive. For example, glass beads of about 8 μm are formed in an epoxy-based adhesive to form a predetermined thickness. those obtained by mixing, by screen printing in a predetermined shape on one of the substrates, the other substrate placing it into position, and pressed while crushing the adhesive layer of about 20μm to 8～9Myuemu, held while 120 ° C. the crimp Drying
A spacer seal was formed by leaving the product in an oven for one hour. [0003] However, in the above-mentioned prior art, since a thermosetting adhesive is used as a spacer seal, the adhesive is hardened at a high temperature (120 ° C). Time (1 hour to 1.5 hours). Here, in particular, in the case of a combination of two substrates made of different materials, for example, quartz glass and Pyrex glass, or Pyrex glass and a transparent plastic film, when left at a high temperature , the two substrates have different thermal expansion coefficients. The positions of the substrates are displaced, and the adhesive hardens without the electrode patterns formed on the two substrates being matched. Therefore, when the temperature is returned from a high temperature to a normal temperature, the positions of the electrodes formed on the upper and lower two substrates are shifted by 10 to 20 μm, and stress is left on the mutual substrates. However, there is a problem that warpage occurs and cracks occur. Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to cure the bonding between two substrates at room temperature and to eliminate a pressing step by a long batch process. . [0005] A method of manufacturing a liquid crystal device according to the present invention is directed to a method of manufacturing a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates adhered with an adhesive. The adhesive made of a cured adhesive is formed on one substrate of the pair of substrates, and a liquid crystal cell is configured to face the other substrate of the pair of substrates, and at least one substrate side of the pair of substrates A member made of a quartz substrate arranged in, and a pressing means constituted by a member and a member opposed to the liquid crystal cell in between, pressurizes the pair of substrates, while sending room temperature air or cooling air, Ultraviolet rays from an ultraviolet ray generation source are transmitted through the quartz substrate to irradiate the pair of substrates to cure the adhesive. FIG. 1 is a partial cross-sectional view of a TFT (thin film transistor) switch matrix laminated liquid crystal display. Reference numeral 1 denotes an upper glass substrate made of Pyrex glass on which green (G), blue (B), and red (R) color filters are formed in one pixel, and 2 denotes quartz glass on which a TFT electrode 5 is formed. Lower and upper and lower glass substrates 1
And 2 are bonded by a spacer seal 3. At this time, one pixel of the color filter 6 and the TFT electrode 5 are bonded so as to face each other. The coefficient of thermal expansion of quartz glass is 0.53 × 10 ⁻⁶ / deg. Since 4 × 10 ^-6 / deg, 1
00 child maximum one pixel or more and a high temperature of ℃ deviate
Therefore , it is necessary to cure the adhesive at room temperature. Therefore, as the spacer seal 3, an ultraviolet-curable adhesive which does not react with the TN liquid crystal 7 after curing and does not disturb the alignment is selected, and the diameter is 8 μm in order to keep the gap constant. Is mixed and printed on the glass substrate 1 in a predetermined shape. Thereafter, the color filter 6 of the upper glass substrate 1 and the TF of the lower glass substrate 2 are removed.
They are overlapped so that the T electrodes 5 face each other. FIG. 2 shows the present invention.
FIG. 3 is a conceptual diagram of pressure curing by ultraviolet light according to the present invention. As shown in FIG.
Between the quartz glass 22 and the pressure plate 23. here,
The quartz glass 22 is a transparent material, and most preferably transmits ultraviolet light, and is used from the viewpoint of accelerating the curing of the adhesive. The upper substrate is fixed by the pressure holding jig 25, and the two substrates are pressed by the pressure cylinder 26 so that the space between the two substrates is 8 to 9 μm while the upper and lower substrates are kept parallel. Then, it is set under ultraviolet rays emitted from the ultraviolet lamp 24 and collimated by the cold mirror 27 for 30 to 60 seconds. Here, curing is performed under normal temperature air or cooling air so that the liquid crystal cell 21 is not heated.
The room temperature air and the cooling air may be air obtained by drying compressed air. The liquid crystal cell 21 thus hardened is taken out, a TN liquid crystal 7 is injected between the spaces, and a polarizing plate 8 is attached to the upper and lower sides. As described above, the reaction with the liquid crystal and the disorder of the alignment by the adhesive do not occur. Finally, the board
Polarizing plates 8 are provided above and below. As described above, the present invention relates to a method for manufacturing a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates adhered with an adhesive, comprising an ultraviolet-curable adhesive. Forming the adhesive on one of the pair of substrates,
A liquid crystal cell is configured to face the other substrate of the pair of substrates, and a member made of a quartz substrate disposed on at least one substrate side of the pair of substrates, and the member is opposed to the member with the liquid crystal cell interposed therebetween. By pressurizing means constituted by a member, pressurizing the pair of substrates, while sending room temperature air or cooling air, irradiates the pair of substrates with ultraviolet light from an ultraviolet light source passing through the quartz substrate, Curing the adhesive has the following effects. (A) It is possible to prevent a temperature rise due to an ultraviolet ray generating source when the adhesive is cured, and to prevent cracks and cracks in the substrate. (B) Since the side of the pressure means to which the ultraviolet rays are irradiated is formed of a quartz substrate, the gap between the substrates can be maintained at a desired thickness, and the ultraviolet rays can be sufficiently transmitted and bonded. The curing of the agent can be accelerated.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a TFT (thin film transistor) switch matrix.
FIG. 2 is a partial cross-sectional view of a liquid crystal display device. FIG. 2 is a conceptual diagram of pressure curing by ultraviolet light according to the present invention. [Description of Signs] 1. Upper glass substrate 2 Lower glass substrate 3 Spacer seal 4 Common electrode 5 TFT electrode 6 Color filter 7 TN liquid crystal 8 Polarizer 21 Liquid crystal cell 22, quartz glass 23, pressure plate 24, ultraviolet lamp 25, pressure holding jig 26, pressure cylinder 27, cold mirror

Claims (1)

(57) [Claims] In a method for manufacturing a liquid crystal device in which a liquid crystal is sandwiched between a pair of substrates adhered via an adhesive, the adhesive made of an ultraviolet curing adhesive is formed on one of the pair of substrates, A liquid crystal cell is configured to face the other substrate of the pair of substrates, and a member made of a quartz substrate disposed on at least one substrate side of the pair of substrates, and the member is opposed to the member with the liquid crystal cell interposed therebetween. By pressurizing the pair of substrates by a pressurizing means constituted by a member and irradiating the pair of substrates by transmitting ultraviolet light from an ultraviolet ray generation source through the quartz substrate while sending room temperature air or cooling air, A method for manufacturing a liquid crystal device, comprising curing the adhesive.