Led or led ( rhymes with head ) is the past tense of "lead" ( rhymes with bead ), meaning to direct or to go in advance of--
"Seventy-six trombones led the big parade..."
The captain led his troops into battle.
LED ( always capitalized, "ell ee dee" ) stands for "light-emitting diode"--
An LED looks like a miniature light bulb.
Your digital display may be an example of an LED.
Now that you know that, you can say--
"The invention of the LED led to the development of a low-energy light bulb for home use."
Note--"lead" may also mean the metal or element ( pronounced to rhyme with head )--
Lead protects Superman from kryptonite.
The dentist puts an apron full of lead pellets on patients before an x-ray.
Note # 2--"LCD" ( ell cee dee ) stands for "liquid crystal display"--
New TV's usually have an LCD screen.
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