There are two important points to pay attention before purchasing LCD television. One is contrast ratio and the other one is response time. High contrast and brightness ratios provide high definition display even in luminious ambient. Response time is based on the quantity of square an LCD TV can show in a second and it`s performance. Faster response timing prevents shadows may occur behind images which are sharper and does not irritate eyes. For Plasma TV`s , quality is defineted by total performance. The most effective factors that leads decision of purchasing Plasma are display quality and brightness. And color, definition, design and lifetime of panel are the others which should have been carefully examinated and evaluated by the purchaser. Providing the highest effect is regarded to high contrast ratio. Black color shown grey, is displayed real black in high contrast ratio plasmas. And all of the other colors are displayed the most living like in reality regarding black.