Being clear on the HDTV Types for you
There are many different types of high definition television sets and HDTV types of sources. The former is about the different kinds of television hardware that can display HDTV types of programming. The latter is about sources of HDTV from television broadcasters.
HDTV broadcasts require a new television setup where the traditional analog broadcast of images and sound will be replaced by higher definition digital images and digital surround audio broadcasts from Television content providers. There are basically 6 HDTV types namely Cathode-ray Tube (CRT) direct view, Rear Project CRT, Liquid-Crystal Display (LCD), Plasma, Microdisplays and Front Video Projector TVs.
The CRT direct view tv uses a cathode-ray tube, grids, an anode and a sealed vacuum glass housing. CRTs make pictures using analog signals though they can be driven by digital signal processing circuits to produces images of high quality. This type has been in service for a long time and is still very effective in translating adequate video and audio from HDTV type networks.
The CRT rear projection TV uses the same CRT set up but project the images unto a much bigger screen using lenses and mirrors. This is an easy way to make TVs with very large screens; however, the resolution will be found inadequate without the help of digital signal processing circuits to make the resolution of the images better. Most of these types come with built-in stands. They are very good for home theaters.
Liquid Crystal Display TVs use thousands of tiny elements, each of which has a liquid crystal solution wherein super-small transistors are mounted to make the crystals twist into different positions. A fluorescent backlight source is polarized before its light reaches the elements. By manipulating these crystals to open and close or twist into different positions and using miniature color filters you can have a full-color video. LCD displays are popular in laptops, PDAs, cellphones and handheld electronic games. LCD TVs weight less than their CRT counterparts.
Plasma TVs have fixed pixel structure. Red, green and blue pixels are shaped inside an assembly of intersecting struts sealed between 2 glass plates and a static gas mixture is present in any given pixel. When an electric voltage is applied to any individual pixel, the gas is ionized to produce ultraviolet light which strikes the different colored phosphors to produce colors. When the voltage is removed, a black color is achieved. Additional electrodes are used to speed up the charging and discharging of the gases making it possible to show full-motion video.
Microdisplay TVs uses digital micro mirror technology to refract light which is then projected to a wider screen.
Front Video Projector TVs have the same technology as the CRT rear projection TVs.
There are several HDTV types of subscription a viewer can choose from. There are the over-the-air, satellite, closed cables, fiber-optic and internet broadcasts of HDTV types of events.
