In this era of various flat screen TVs, one has to be very sure of what TV suits their room lighting, angles of viewing and your budget. The major TV types available in the market include: Plasma, LCD, LED & OLED . We’ll try to explain these types as simply as possible.
Plasma displays are generally considered to offer better dark-room viewing and wider viewing angles than LCD. Plasma TVs are available in sizes from 37 inches to over 100 inches, measured diagonally. Plasma can be vulnerable to burn-in, a phenomenon in which faint, permanent “ghosts” appear on displays that have maintained a fixed image for long periods of time. Examples of such images include the bars seen when watching 4:3 video on a widescreen display or the constantly running ticker seen on some shows or channels. Most newer models have burn-in prevention features, but these may not always be 100% effective. However, some plasma TVs also have the ability to remove burn-in should it occur.
Vendors of plasma TVs include Fujitsu, Funai, Gradiente, Lanix, LG, Panasonic, Proscan, Samsung and Sanyo.
Pros: Wide viewing angles. The black-level performance (the intensity of black in the display) compensates for ambient light and sharpens the picture. Excellent picture quality in higher-end models. Not as bulky as rear projection TVs. Wall-mountable. High refresh rate means that the picture is smoother and there is no motion blur. Burn-in is possible but not usually a problem with newer models.
Cons: Consume significantly more power than LCD TV of similar size. Slightly heavier than LCD. Glass screen can reflect light unless treated to be less reflective.
2. LCD TV is a television display technology based on a liquid crystal display. LCD TVs consume much less power than plasma displays because they work on the principle of blocking light rather than emitting it.
An LCD display uses either a passive matrix or an active matrix display grid. The active matrix LCD is also known as a thin film transistor (TFT) display. The passive matrix LCD has a grid of conductors with pixels located at each intersection in the grid. A current is sent across two conductors on the grid to control the light for any pixel. An active matrix has a transistor located at each pixel intersection, requiring less current to control the luminance of a pixel. For this reason, the current in an active matrix display can be switched on and off more frequently, which improves the refresh rate.
Pros: Not prone to burn-in. Available in smaller sizes than plasma, so may be a better option depending on the available space.
Cons: Can suffer from slower response, which can create a ghosting effect. Some models are also prone to the screen door effect, which means that a faint mesh pattern may be visible.
3. LED TV is a type of LCD television that uses light-emitting diodes (LEDs) to backlight the display instead of the cold cathode fluorescent lights (CCFLs) used in standard LCD televisions. LED TVs are more formally known as LED-backlight LCD television.
4. OLED TV is a television display technology based on the characteristics of organic light-emitting diodes (OLED). OLED TV is a different technology than LED TV.
The OLED display is based an organic substance used as the semiconductor material in light-emitting diodes (LEDs). The display is created by sandwiching organic thin films between two conductors. When an electrical current is applied to this structure, it emits a bright light. Because OLED displays don’t require backlighting, they can be thinner and weigh less than other display technologies. OLED displays also have a wide viewing angle — up to 160 degrees even in bright light — and use only two to ten volts to operate.
OLED technology was pioneered at Kodak, by Dr. Ching W. Tang. OLED variations include the FOLED (flexible organic light-emitting display), which promises to bring portable, roll-up displays to the consumer market.
Vendors of OLED TVs include LG and Samsung.
Pros: Extremely thin displays, with the best picture quality of any of the flat-panels. Low power requirements. Very wide viewing angle, contrast ratio of 1.000.000:1.
Cons: Very expensive. However, the prices are expected to drop as the technology matures.