US 6,288,766 B1Granted

Manufacturing method of liquid crystal element for injecting the liquid crystal into the cell and liquid crystal injecting device

AssigneesSharp Kabushiki Kaisha, The Secretary of State for Defence in Her Britanic Majesty's Goverment of the United Kingdom of Great Britain and Northern Ireland

InventorsRyutaro Mashiko, Mitsuhiro Shigeta, Tomoo Furukawa, Teiyu Sako, Hirokazu Sasaki

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Abstract

A liquid crystal injecting device has a jig which seals an opening used as a liquid crystal inlet of the cell and another opening used as an air outlet of the cell separately. When obtaining a liquid crystal element by injecting liquid crystal into the cell, the liquid crystal is applied to the inlet before the injection, and after an internal pressure of the cell is reduced by releasing air from the jig, the liquid crystal is injected to the cell by being supplied to the inlet through a liquid crystal supplying tube. During the injection, a temperature of the cell is set to a temperature at which the liquid crystal takes a nematic, cholesteric, or isotropic phase, while air is kept being released. When the injection ends, the liquid crystal is further applied to the inlet and outlet, while being reinjected into the cell through all the openings at room temperature or above under atmospheric pressure or above, after which the cell is cooled.

Claims16

Dependent claims

A manufacturing method of a liquid crystal element by injecting liquid crystal into a cell composed of a pair of opposing substrates, at least one of which transmitting light, and provided with at least two openings, said method comprising:

a liquid crystal applying step of applying liquid crystal to at least one of the openings and a vicinity thereof;
a cell's internal pressure reducing step of releasing air from an interior of said cell through at least one of the openings to lower an internal pressure of said cell than an external pressure thereof;
a cell temperature setting step of setting a temperature of said cell to a temperature at which the liquid crystal to be injected therein takes one of a nematic, cholesteric, and isotropic phase;
a liquid crystal injecting step of injecting the liquid crystal into said cell through the opening to which the liquid crystal has been applied while air being kept released from said cell;
a liquid crystal re-injecting step of applying the liquid crystal to all the openings of said cell, and re-injecting the liquid crystal through all the openings at room temperature or above under atmospheric pressure or below;
and
a cell cooling step of cooling said cell to room temperature after the liquid crystal has been re-injected into said cell.

4 more elements

Dependencies are inferred from the claim text.