Difference between LCD and LED Televisions

Key Difference: LCDs are type of television screens that use liquid crystals sandwiched between two sheets of polarizing material. LED (Light emitting diode) TVs are still LCD TVs that replace the original LCD’s CCFL (Cold Cathode Fluorescent Lamp) technology with LED technology. An LED TV’s screen is also made up of liquid crystals.

LED TVs have become a new trend, an upgrade to LCDs if you must. Companies have been labeling the LED TVs as new technology, which is not true. LCDs and LEDs have a lot in common. Let’s look at the definition of an LCD first.

An LCD is type of television screen that uses liquid crystals sandwiched between two sheets of polarizing material. LCDs provide significant benefits compared to CRTs and plasmas, such as they consume less power than both. Both CRTs and Plasmas are susceptible to burn-ins while LCDs are not. LCDs are also best to display in small sizes, anything bigger than 40 inches becomes expensive compared to plasmas. It also faces a dead pixel problem, where pixels can die causing a spot to appear on the screen. However, LCDs require a backlight as it cannot emit light. This is the major difference between an LCD and a LED, while LCDs require a backlight; LEDs can emit light by themselves.

LED (Light emitting diode) TVs are still LCD TVs that replace the original LCD’s CCFL (Cold Cathode Fluorescent Lamp) technology with LED technology. An LED TV’s screen is also made up of liquid crystals. A LED is a semiconductor device and when it is switched on, electrons are able to recombine with electron holes within the device and release energy in form photons or light. This light emitted from an LED is used as a backlighting for an LCD TV. There are two forms in which and LED is used to light up an LCD; edge lighting and full array lighting.

In edge lighting, a series of diodes are arranged along the outside edges of the screen, when a current is applied the light is then distributed evenly along the screen. This is similar to using CCFL lighting as it does not have local-dimming capabilities (where images are dimmed in response to their surroundings). In fully-array, the diodes are spread across the entire surface of the screen. These are faster in response and include the local-dimming feature as they have the capability of turning on and off independently.

As you can see a better term for a LED TV would be LED-backlit LCD TV. A few benefits that an LED backlight provides is that it extends the life span of the TV, provides a better image, has the ability to provide Jet black level, and is thinner and lighter compared to the CCFL LCDs. These are however more expensive compared to the original LCDs.

 

LCD

LED

Thickness

Thicker compared to LED

Thinner compared to LCD

Power consumption

Consumes more power compared to LED

Consumes less power than LCD

Screen Refresh Rate

Less than LED

Greater than LED

Screen glare

Glare is minimum

Glare is minimum

Running Temperature

Cool

Cool

Burn-in

No burn-in occurs; but burn-outs can occur

No burn-in occurs; but burn-outs can occur

Dead pixels

Can occur

Can occur

Viewing angle

Up to 165 degrees

Up to 165 degrees

Contrast Ratio

15000:1

15000:1

Life span

60,000 hours

100,000 hours

Black level

Gray to Dark Gray

Jet Black

Weight

Heavier compared to LED

Lighter compared to LCD

Uses

Computer monitors, laptop screens, TV screens and cell phone screens

Computer monitors, laptop screens, TV screens and cell phone screens

Price

Cheaper

More expensive

Benefits

Panels weigh less than plasma; use less energy; light; thinner; emits less electromagnetic radiation; no bleeding or smearing

Weight less than LCD; have a longer life; more environment friendly; lower power consumption; more reliable

Limitations

Slower refresh rate; limited viewing angle; blacks are brighter; susceptible to burn-out and image persistence; dead or stuck pixels may appear; smearing or ghosting can appear; loss of contrast in higher temperatures; poor display in sunlight

Expensive

Image Courtesy: televisions.com, ledvslcd.com

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