Liquid Crystal Display (LCD) technology can be used to create small or large display panels. They consist a layer of liquide crystal molecules between 2 polarising filters. The filters are at 90 degrees to each other, so no light will pass through them. When an electric field is applied across the liquid crystal it assumes a helical structure and rotates the polarised light passing through it from the back polarised filter, allowing it pass through the front polarised filter.
Advantages Of LCD
- LCD panels are much low power than plasma and projection large display technologies, saving electricity.
- Do not suffer from "burn in" problems often associated with plasma displays.
There are a few disadvantages also:
- Large displays are expensive.
- Usually LCDs have slower response times, causing blur on fast moving video sequences.
- The manufacturing process can result in defective pixels (either stuck on or off). Most manufacturers assume a certain number of defective pixels to be acceptable and will not replace products which come within this range. You should check the allowed number of defects when comparing prices on LCD TVs.
- The LCD array always allows a small amount of light to pass through, resulting in a brighter black level than other technologies.