-- Why there are two kinds DVB-T Format? which one can be used in my country?
There are two kinds DVB-T program, MPEG-2 Format and MPEG-4 Format, In most European countries, MPEG-2 and MPEG-4 both ok, but for following countries, just MPEG-4 works: Cyprus/Estonia/Greece/Hungary/Ireland/Norway/Poland/Portugal/Slovenia/India/Israel, so for these buyers, in order to receive Digital TV program, please check carefully if the item you want supports MPEG-4 format. Till now our company has this units that support MPEG-4: ES966D(Built-in MPEG-4 Receiver) and ES498D/ES499D(TV Box)
-- What is 1 DIN, 2 DIN, and half DIN?
DIN refers to a standardized radio/stereo size for vehicles (large enough to accept a CD). 1 DIN is the standard DIN specification. 2 DIN or double DIN refers to units that are twice as high as the standard DIN, half DIN is half high as 1 DIN.
International standard ISO 7736 defines a standard size for car audio head units. The standard was originally established by the German standards body Deutsches Institut fur Normung, and is therefore commonly referred to as the "DIN car radio size". It was adopted as an international standard in 1984.
-- How do I know which broadcasting format it is in my country? NTSC or PAL or SECAM?
NTSC stands for North American Television Standards Commission.
PAL stands for the Phase Alternating Line.
SECAM stands for System electronic Color and Memory.
NTSC: USA, Canada, Japan, Korea, Mexico, Latin America, Taiwan, etc.
PAL : Singapore, China, Australia, United Kingdom, Western Europe, Brazil, South America, etc.
SECAM: France, Russia, Eastern Europe, Hungary, Iran, Iraq, some African countries, etc.
-- What is TFT and LCD?
TFT: which is also known as active matrix stands for Thin Film Transistor. In a TFT screen, one transistor is located for each color (RGB) of each pixel. The transistor is to control whether light is allowed to pass from the backlight. Each pixel is made up of three sub-pixels with each having its own transistor.
LCD stands for liquid crystal display. It consists of several layers: polarizing filter, sheet of glass, electrode, alignment layer, liquid crystals, alignment layer, electrode, sheet of glass and polarizing filter. Applying an electric current to the crystals will untwist them to varying degrees, subject to the current's voltage. The amount of light passage is controlled by the twist/untwist mechanism.
Unlike CRT monitors, LCD monitors are digital in nature, making possible a direct digital connection to the computer. Because digital-to-analog conversion is not needed, loss of signal is virtually eliminated, resulting in a better image quality.