Radios were the first mass medium in the world
in the 1930s later in the month of
September 15th, 1959
televisions were introduced in India and which was first tested in Delhi. These
were the basic television which is called CRT (Cathode Ray Tube) model. The
images are displayed through a tube known as a vacuum
which carries electron gun and bright screens these deflect the electron beam into the screen in order to create images.
Later in 21st century LCD screens which
stands for (Liquid Crystal Display) were introduced. LCD’s are mostly used for
the displays of the laptops, computers and then as television screens. This television
has a flat panel which can block the light or allows to pass it. These panels
are made with the segments with each and single block which are filled with the
liquid crystals. Using the electrical current the colour transparency can be
made for these blocks. The most important thing to be noted is the light is not
produced by the LCD crystals. So, these can get through
the external lightings like a fluorescent
bulb to make an image.
