Final answer:
Twisted Nematic (TN) technology pertains to LCD display technology, utilizing liquid crystals that can rotate light's polarization to create images on the screen, with the process being controlled by voltage applications.
Step-by-step explanation:
The technology known as Twisted Nematic (TN) relates to LCD display technology. TN panels are a type of liquid crystal display that is widely used due to its ability to offer fast response times and high refresh rates, which are advantageous for tasks such as gaming and dynamic video playback. These panels include molecules that can be oriented, or twisted, and are sandwiched between two polarizing layers. When an electric voltage is applied, the alignment of the liquid crystal molecules changes, and this modulation of the light passing through them allows for the display of images on the screen.
Twisted Nematic technology is capable of rotating the polarization of light to allow the light to pass through a filter. This effect is manipulated to create contrast patterns, as seen in Figure 27.47. The system described in the figure shows how light can be rotated 90° by a liquid crystal and passed by a polarizing filter when no voltage is applied and blocked when voltage is applied, hence making the region appear dark. This is central to how images and text are displayed in LCD devices.
In contrast, OLED display technology utilizes organic compounds that emit light when an electric current is applied, eliminating the need for a backlight. Plasma display technology involves illuminating small colored fluorescent lights to make up an image. CRT technology, or Cathode Ray Tube, uses a beam of electrons that strikes a phosphor-coated screen to create images but is now considered obsolete compared to modern flat screen technologies like LCD.