Context: Alphanumeric LEDs are available in seven-segment, starburst and dot-matrix format. Seven-segment displays handle all numbers and a limited set of letters. Starburst displays can display all letters. Dot-matrix displays typically use 5x7 pixels per character. Seven-segment LED displays were in widespread use in the 1970s and 1980s, but rising use of liquid crystal displays, with their lower power needs and greater display flexibility, has reduced the popularity of numeric and alphanumeric LED displays.

Question: What type of LEDs are available in seven-segment format?
Answer: Alphanumeric

Question: What is another format that Alphanumeric LEDs are available in?
Answer: dot-matrix

Question: Which alphanumeric LED display can display all letters?
Answer: Starburst

Question: What type of pixels does a dot matrix display use?
Answer: 5x7

Question: What has reduced the popularity of numeric LED displays?
Answer: liquid crystal displays

Question:  What type of LEDs are available in eight-segment format?
Answer: Unanswerable

Question: What is another format that non-Alphanumeric LEDs are available in?
Answer: Unanswerable

Question:  Which non-alphanumeric LED display can display all letters?
Answer: Unanswerable

Question:  What type of pixels does a dot matrix display not use?
Answer: Unanswerable

Question: What has reduced the popularity of numeric non-LED displays?
Answer: Unanswerable