LCD is also different

The moment of the LCD screen body mainly uses TFT (ThinFilmTransistor) technology as the underlying drive technology to achieve high-speed, high brightness, high contrast, color reproduction, wide viewing angle display, while in display technology , there are now often used in TN screen , IPS screen , CPA screen , PVA and MVA panel screen, which is used widely TN screen is also the cheapest , the disadvantage is small and pseudo-color viewing angle , which have a modified version of the TN + film panel . The main difference between these screen contrast , viewing angle , color performance and speed of response show detail , it should be said that their own merits. Which IPS ( hard screen ) , with better overall display, with high viewing angle , fast response , accurate color reproduction , etc., more serious drawback is leaked , black pure enough .
A variety of display technologies against each other at the same time , "LED LCD screen" is intentionally or unintentionally vague concept , and as a selling point to the market . In fact, LED is the acronym for Light Emitting Diode LightEmittingDiode , which itself can be luminous and colored , can be applied directly as a display unit , has a good price , and now the vast majority of all outdoor advertising screen with LED screen, but because of the direct use of LED as the display unit pixel is too large and can not be done at close range high-definition display , it can not be applied in the security industry . Back to recent hot LED LCD screen , which displays as a principle or through the liquid crystal light valve control pass , but different from the traditional CCFL (cold cathode fluorescent lamp ) , which uses LED as backlight LCD screen . Because the LED backlight can be done uniformly distributed and therefore able to achieve a good local dimming , and its wider color gamut backlight , the relative CCFL light source, which has a longer life, low light decay , energy saving and environmental protection, and effectively eliminate the black edges and other visible advantages , but also to some extent reduces the distance patchwork .
It should be noted that, although the mosaic screen of the display depend on the quality of the liquid crystal panel, a single screen , but the choice of video solutions mosaic screen (DSP) will directly affect the merits of the input video image decode the picture quality.