Conventional liquid crystal modes such as twisted nematic (TN) have problems such as brightness change an color shift depending on the viewing angle. In TN mode, liquid crystal molecules stand up as a voltage is applied to them. When liquid crystals are in an upright position, their optical characteristics vary significantly depending on the viewing angle. This results in variation in color and brightness from different viewing angles. In in-plane switching (IPS) mode, liquid crystal molecules rotate in parallel with the panel. This means that the variation depending on the viewing angle is limited. Therefore, IPS LCD provides limited changes in brightness and color irrespective of the viewing angle to produce high image quality.
Difference between TN mode and IPS mode
IPS-NEOTM, which is evolved from IPS, focuses on true-black appearance. Conventional IPS displays had a slight light leak when viewed from a slanted angle. They had difficulty in expressing dark black. IPS-NEOTM adopts a photo alignment technology to prevent light leak at the time of displaying black. On LCD, it is necessary to align liquid crystal molecules uniformly in a specific direction. In the past, a method of rubbing the substrate surface with a cloth in a single direction, called rubbing orientation, was used. However, as the resolution heightened, fine unevenness on the substrate surface made it difficult to align liquid crystal molecules uniformly and eventually caused the light leak in black display. Our IPS-NEOTM irradiates a special ultraviolet (UV) ray to successfully align liquid crystals quite uniformly even for high definition displays and to suppress light leak.
Comparison between IPS-NEOTM and Conventional IPS