JPS62129817A - Manufacture of liquid crystal display device - Google Patents

Abstract

PURPOSE:To shorten the time of a seal curing process and to facilitate the operation by scattering adhesive particles and a gap control material at the same time, heating and curing them during a press process for gap adjustment, and coupling both substrates with their adhesive strength. CONSTITUTION:The gap control material 23, liquid crystal 24, and adhesive particles 25 are interposed between two glass substrates 21 and 22 which have transparent electrodes on internal surfaces and a thermosetting seal agent 27 which contains a gap control material 26 is arranged on the peripheral edge part to form a cell shape. The adhesive particles 25 cure to adhere at temperature higher than the dislocation temperature between liquid crystal and liquid and seal curing temperature and need to be larger in size than the gap control material. When the gap of this cell-shaped assembly is adjusted while external force is applied between a pedestal 31 and a pressure plate 33, the adhesive particles 25 are heated up to temperature of curing and adhesion. Then, they are cooled and the application of the external pressure is stopped; and the cell-shaped assembly is heated to temperature lower than the curing temperature of the adhesive 25 to cure the seal agent 27. Consequently, the time of the seal curing process is shortened.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a liquid crystal display device in which a gap control material and a liquid crystal are interposed between two glass substrates on which transparent electrodes are formed, and a sealant is provided on the periphery of the gap control material and the liquid crystal. It relates to a manufacturing method.

[Prior Art] When manufacturing a liquid crystal display device, for example, as shown in FIG. 4 interposed therebetween, and a thermosetting sealant 5 mixed with a gap control material 6 on the periphery thereof in a cell state, which is sandwiched between metal plates 9.10 from above and below with a cushioning material 7.8 in between, Temporarily tighten bolts 11 and nuts 12 and attach them to a press (not shown), apply external force to crush the sealant 5 to a predetermined thickness, and tighten bolts 11 and nuts 12 according to the numbers. The sealant 5 is cured by heat treatment while maintaining the pressurized state (pressure by the press device is released).

However, in such a method, the substrate 1.
2 is sandwiched between metal plates 9 and 10 with large heat capacity,
In order to heat the substrate 1.2 together with this metal plate, the substrate 1.
. Further, it is time-consuming to insert the seal between the metal plates 9 and 10 and to take it out after the seal has hardened.

[Object of the Invention] An object of the present invention is to provide a method for manufacturing a liquid crystal display device that can shorten the time of the seal curing process and simplify the work.

[Summary of the Invention] The present invention provides a gap control material and a liquid crystal interposed between two glass substrates having transparent electrodes on their inner surfaces, and a thermosetting sealant disposed on the periphery of the gap control material. In a method for manufacturing a liquid crystal display device in which a press treatment for adjustment is performed and then a heat treatment is performed for seal hardening, when the gap control material is sprayed, the temperature is higher than the transition temperature between the liquid crystal and the liquid and the seal hardening temperature. Adhesive particles that soften and adhere at temperature and have a diameter larger than that of the gap control material were simultaneously sprayed, and during press processing for gap adjustment, the adhesive particles were heated to a temperature at which they softened and adhered while remaining in the pressurized state. Thereafter, the adhesive is cooled and the external pressure is removed, and then the adhesive is heated for a predetermined time at a seal hardening temperature lower than the softening temperature of the adhesive to harden the seal.

[Example] Fig. 1 shows an example of the present invention, in which two glass substrates 21 are formed with transparent electrodes on their inner surfaces and subjected to alignment treatment.
．． A gap control material 23, a liquid crystal 24 and adhesive particles 25 are interposed between Vl and a gap control material 26 on the peripheral edge thereof.
A thermosetting sealant 27 containing the following is disposed to form a cell shape. The adhesive particles 25 are those that soften and bond at a temperature higher than the transition temperature between liquid crystal and liquid and the seal hardening temperature, and have a diameter larger than that of the gap control material 23.

Then, the cellular aggregate is placed on the cushion material 3 on the upper surface of the pedestal 31.
2 and sandwich it between the holding plate 33 and the cushioning material 34 on the lower surface of the holding plate 33. The presser plate 33 is attached to the shaft 3 of the press device.
5, and press down to adjust the gap. In this case, the adhesive particles 25 are heated to a temperature at which they are softened and bonded while applying external pressure. Heating for several minutes softens the adhesive particles 25 and connects both substrates 21 and 22 with a predetermined gap maintained.

After this, it is cooled and the external pressure is removed.

Next, the cellular aggregate is transferred to a heat treatment process for seal hardening, and heated at a seal hardening temperature lower than the softening temperature of the adhesive for the required time (about 1 hour), the sealant 27 is hardened, and by cooling A liquid crystal display cell is formed.

[Effect] As described above, according to the present invention, adhesive particles are
It is sprayed at the same time as the rtIl material, heated and softened during the press process to adjust the gap, and its adhesive force connects both substrates, so only the cellular aggregate needs to be heated during the heat process to harden the seal. Therefore, the time required for the temperature of the substrate to reach a predetermined seal hardening temperature and the cooling time can be shortened, and the time required for the seal hardening process can be shortened. In addition, time-consuming operations such as sandwiching the board between metal plates, tightening the pole 1 and the nut, and releasing the same are no longer necessary, and the process can be simplified. Furthermore, since the gap is controlled using the gap control material and adhesive particles, it is possible to obtain a liquid crystal display device in which the gap is uniformly controlled over the entire substrate.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a gap control process showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a gap control process showing a conventional example. 21 and 22...Substrates 23 and 26...Geared TII material 24...Liquid crystal 25...Adhesive particles 27...Thermosetting sealant 31...Base

Claims (1)

[Claims] A gap control material and a liquid crystal are interposed between two glass substrates having transparent electrodes on their inner surfaces, and a thermosetting sealant is placed on the periphery of the two glass substrates, and a press process is performed to adjust the gap. In the manufacturing method of a liquid crystal display device in which a heat treatment is subsequently performed for seal hardening, when the gap control material is sprayed, the gap control material is softened and bonded at a humidity higher than the transition temperature between the liquid crystal and the liquid and the seal hardening temperature, and the gap control material is Adhesive particles having a diameter larger than that of the control material are simultaneously sprayed, and during press processing for gap adjustment, the adhesive particles are heated to a temperature at which they soften and bond while still in the pressurized state, and then cooled and the external pressure is removed. . A method for manufacturing a liquid crystal display device, characterized in that the seal is cured by heating for a predetermined period of time at a seal curing temperature lower than the softening temperature of the adhesive.