How do LCD resolution limits relate to the liquid nature of liquid crystals?
In nematic arrangements the crystals are randomly positioned with all their long axes pointing in essentially the same direction, given by a vector known as the director. In smectic arrangements the crystals are further constrained to parallel planes; in smectic A the director is perpendicular to these planes, while in smectic C the director is at some other angle to the planes.
The liquid nature of liquid crystals impacts display resolution because the molecules are not fixed in rigid positions; they can flow past one another. Because of this fluid property, it is difficult to completely isolate adjacent areas of the crystal from one another. This lack of total isolation means that the influence of an electric field applied to one pixel can potentially affect neighboring regions, which limits the maximum resolution achievable by the display.12
To mitigate these limitations and achieve higher resolutions, modern liquid crystal displays often utilize an "active matrix" design. This involves a grid of thin-film transistors and capacitors that allows for more precise control over specific portions of the crystal, enabling them to respond rapidly and independently.2