Parallax compensating color filter and black mask for display apparatus

A display device comprising:

• at least two substrates spaced from each other, the substrates each having an internal and an external surface, the internal surfaces of the two substrates facing each other, at least one of the substrates being transparent;
• electrodes positioned to establish a field in the space between the two substrates;
• an optically active material occupying at least a portion of the space between the two substrates and having optical properties influenced by the field;
• a continuous seal is formed between the two substrates creating a cavity between the two substrates and circumscribed by the seal perimeter;
• at least one fill port in the form of a hole in one or both of the substrates within the inner area of the seal perimeter, through which optically active material can be inserted into the space between the two substrates;
• a flexible film cover overlying and sealed to the fill port,
• wherein the film cover and fill port are sized and positioned so that a predetermined quantity of optically active material may be sealed in place inside the film cover after the space between the substrates is evacuated, and so that the film cover will deflect inwardly at the fill port to force the optically active material into the space between the substrates when the device is exposed to ambient pressure.