|Transmissive LCDs always require a backlight and provide the highest brightness display. They are best suited for applications where direct sunlight viewing is not involved.||Reflective polarizers are used in high ambient light environments or whenever sufficient power is not available to drive the backlight.||
Transflective polarizers have both reflecting and transmitting properties and offer the most versatile viewing characteristics. They can be viewed in direct sunlight and when combined with a backlight in low light conditions.
Twisted Nematic (TN)
This technology consists of nematic liquid crystal sandwiched between two plates of glass. When power is applied to the electrodes, the liquid crystals twist 90°.
Super Twisted Nematic (STN)
This technology has rapidly become a standard for most monochrome passive-matrix LCDs. It uses the same principle as TN displays but uses less power and is typically less expensive. The liquid crystals in STN technology have a 210° - 270° twist which allows for a broader transition region for gray scaling. STN displays can also be made purely reflective for viewing under direct sunlight.
Film Compensated Super Twisted Nematic (FSTN)
This technology uses a film compensating layer between the STN display and rear polarizer. This additional film increases the overall sharpness and contrast of the display.
Positive Display Type
Positive displays provide an image with dark pixels on a light background. Ambient light or a backlight can be used for this type of display and is capable of multiple background colors.
Negative Display Type
Negative displays provide an image with light pixels on a dark background. The backlight must be used for this type of display and is capable of multiple pixel colors.