Thursday, November 18, 2010

Explain and differentiate among Plasma, LCD and LED television technologies – Civil Services Main Exam 2010 Question.

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LCD TV
·        A polymer which holds the liquid crystals between two transparent oppositely polarized layers these crystals can pass or block light depending upon their current consumption. Each pixel produces their respective color using their respective RGB sub pixels.

·        Low refresh rate meaning that motion blur often occurs and aren’t good for fast motion pictures (sports and movies).

·        Very little chance of a pixel burn-in or Dead pixel problem.

·        Unlike the standard CRT or Plasma, there are no phosphors to be lit so there is no radiation from the screen.

·        LCD TVs require backlit which is either a CCFL lamp or LEDs while plasma and LED TVs does require backlit. 

·        Higher image brightness over Plasma.

·        Color reproduction is not great as Plasma.

·        Lower contrast ratio, not as good for rendering deep blacks.

·        The size of LCD TV ranges from 14 inches to 102 inches. 

·        Viewing angle is lower than that of LED and plasma TVs.

·        Power consumption is less when compared to Plasma and higher when compared to LED TV.

·        Lower carbon emissions therefore eco-friendly. 

·        Cost effective and physically lighter than Plasma TVs and slightly larger than LED TVs as LCD TV requires backlit. 

·        The In plane switching panels (IPS) in LCD TVs significantly improves the contrast ratio and viewing angle.

LED TV

·        LED TVs are actually the next generation of LCD screens. LED TVs are similar to LCD but here each pixel is actually a Light Emitting Diode (LED) instead of liquid crystals. LEDs do not require backlit as LCD which has either CCFL or LED backlit. 

·        LEDs have better black level and contrast ratio than LCD. 

·        As there is no need of backlit it consumes less power when compared to plasma and LCD.

·        The refresh rates are better than LCD and slightly lower or equal that of plasma displays.

·        Lower carbon emission than LCD and plasma.

·        High viewing angle than LCD.

·        Costlier than LCD TV.

·        Have higher life time than plasma.

·        The size of LCD TV ranges from 16 inches to 102 inches.

Plasma TV

·        Each pixel in Plasma TV is filled with xenon, neon and argon gasses which when electrically charged; the gas is ionized and will hit respective RGB colored phosphors produce colors respectively.

·        High contrast ratio than LCD due to its ability to show deeper blacks.

·        Excellent color accuracy reproduction therefore produces bright, clear images.

·        Very high viewing angle view the full screen from up to 178 degrees from either side.

·        Better pixel response time so excellent for motion playback especially for watching sports.

·        Overall image quality is better than that of an LCD and LED. 

·        They have short life spans Most are now rated in the 60,000 to 100,000 hours range or lifespan of about 10-15 years.

·        They won't work in high altitude because of problems for the plasma gasses in low pressures.

·        Prone to pixel burn-out problems. 

·        More heat generation.

·        Plasma TV sizes range from 42 inches to 65 inches or more. 

·        Plasma TV needs rooms with controlled low to normal lighting for better viewing experience.

·        Much Higher carbon emissions than both LCD and LED.