Thin film transistor liquid crystal display (TFT-LCD) is a variant of liquid crystal display (LCD) which uses thin-film transistor (TFT) technology to improve image quality (e.g., addressability, contrast). TFT LCD is one type of active matrix LCD, though all LCD-screens are based on TFT active matrix addressing. TFT LCDs are used in television sets, computer monitors, mobile phones, handheld video game systems, personal digital assistants, navigation systems, projectors, etc.The development of a thin-film transistor (TFT) technology for use with plastic substrates is still in its infancy. There is significant room for improvement in ultra-low temperature fabricated poly-Si TFTs. High mobilities, low leakage currents and threshold voltages are desirable for high-performance active-matrix LCD applications, particularly for the integration of driver circuitry, but low processing temperatures (<150ºC) must be maintained for compatibility with low-cost plastic substrate materials. In general, superior poly-Si TFT performance is achieved with higher-temperature fabrication processes, because the quality of the critical gate-dielectric interface is highly sensitive to process temperature. The inexpensive twisted nematic display is the most common consumer display type. The pixel response time on modern TN panels is sufficiently fast to avoid the shadow-trail and ghosting artifacts of earlier production.In-plane switching was developed by Hitachi Ltd. in 1996 to improve on the poor viewing angle and the poor color reproduction of TN panels at that time. Its name comes from the main difference from TN panels, that the crystal molecules move parallel to the panel plane instead of perpendicular to it. This change reduces the amount of light scattering in the matrix, which gives IPS its characteristic wide viewing angles and good color reproduction
Archive for June, 2010
Thin film transistor liquid crystal display (TFT-LCD)
June 21st, 2010Biggest Snake in the World
June 3rd, 2010
Snakes are some of the most peculiar reptiles on Earth. They slither their way around the world on land and their dominion extends even in lakes, rivers and oceans. Snakes evolved from aquatic and burrowing lizards and today there are over 2900 species of them around the world. So, let us see among all these species, which one qualifies to be the biggest snake in the world.The biggest snake in the world by length, that is, the longest snake is the ‘Reticulated Python’ or Python Reticulatus found in South East Asia. Growing up to an average length of over 28 feet (that is 8.7 meters), this is the longest species of snake in the world. These snakes belong to the family of pythons, which are all non-venomous giant snakes, who kill their prey by constriction. They also happen to be the longest living reptiles on Earth. Their name ‘Reticulated’ or ‘Net Like’ comes from the net like patterns on their bodies.
