The following question s relate to LED Backlight LCD Monitors. (Please feel free

Question

The following question s relate to LED Backlight LCD Monitors. (Please feel free to use more paper if need be). See Resources. Please explain the differences between LED Backlight LCD Monitor, LCD and CCFL Monitors (Cold Cathode Fluorescent Lamp) Monitors. What are some advantages o f LED Backlight LCD Monitors when compared with LCD a n d CCFL Monitors? What color LEDs are used in the creation o f an LED Backlight LCD Monitor ? Does a Black Back ground use less energy than a White Background? If you can believe the hype, how and why are LED Backlight LCD Monitors among the most energy efficient, higher than heirs apparent ?

Explanation / Answer

Answer or part Ist part

Cold Cathode Fluorescent Lamp (CCFL)

It is a technology. CCFL's are an older technology, and for the moment are the most widely used backlights in laptops LCDs. They are made of a fluorescent tube connected to a voltage inverter board which provides power to the backlight. Sometimes the backlight contains 2 tubes along with 2 pairs of inverters; these are called "Dual Backlights" or 2-CCFL.

Light-Emitting Diode (LED)

LED's are a newer technology and use a matrix or a strip of LED's instead of a tube. Most LED based backlights do not need inverters. LED backlights are already used in most mobile devices like phones and GPS devices. LED use in laptop screens has recently become popular due to advantages in size, power consumption, etc.
Image credit: Wikipedia

Differences in CCFL and LED Backlight Technologies

Answer for 2nd part

the advantage of Led over ccfl

answer for 3rd part

Yes,Black background uses less energy than white

explanation->All types of screens use the majority of their energy to produce light. LCDs emit this light energy from the backlight. A smaller amount of energy is used to refresh the image on screen. As a general LCD rule, dark images use slightly more energy than light images because energy is required to "activate" the pixel (electricity flows through the pixel causing the liquid crystals to darken).

This may seem counter intuitive--a darker screen produces less light so it should use less energy, right? Unfortunately, conventional LCDs don't dim the backlight for dark images. Instead, the backlight remains on and dark pixels just block out most of that light.

A "smart" LCD screen uses less energy than a standard LCD. Smart LCDs can dynamically adjust the brightness level of the screen's backlight based on the current image. For example, if most of the pixels are black, there's no need to turn the backlight up to full brightness, so the screen reduces power to the backlight, saving energy.

CCFL LED Size Thicker and heavier Thinner and lighter Cost Cheaper and more cost effective More expensive, but are becoming more affordable as more laptop manufacturers are using LED backlights Power Higher power consumption and heat generation Lower power consumption and heat generation Brightness Lower brightness Generally higher brightness Finish Available in Matte or Glossy Available in Matte or Glossy Lifespan Shorter lifespan Last longer than CCFL's

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