Method and apparatus for injecting liquid into display device cell

摘要

Injection of a functional liquid into a display device cell having an inlet opening and a relatively narrow space between front and back substrates. The liquid is a liquid crystal for a liquid crystal display device or an electrolyte solution for an electrochromic device. The cell is placed in a chamber such that the inlet opening is in an uppermost section of the cell. Also a vessel containing the liquid is placed in the chamber, and vacuum is created in the chamber. In that state the inlet opening of the cell is connected to the liquid in the vessel by a pipe. After that the lever of the liquid surface in the vessel is suitably varied with respect to the level of the inlet opening of the cell by vertically moving the vessel containing the liquid and/or the cell, while an inactive gas is gradually introduced into the chamber to produce a controlled pressure difference between the interior of the cell and the inactive gas atmosphere in the chamber. By this method the injection of the liquid is accomplished easily and efficiently without producing bubbles in the display device cell and without distorting the planar and parallel substrates of the cell.