Repairs for any Phone or Tablet at Cellhelmet (50% Off). Two Options Available.

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94% of 34 Groupon Customers Recommend

from $25
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Over time, cell phones have become man's best friend, much to the chagrin of dogs and Jeremy, who's known man since elementary school. Get a better connection with this Groupon.

Choose Between Two Options

  • $25 for $50 worth of phone or tablet repairs
  • $35 for $70 worth of phone or tablet repairs

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Liquid Crystals and LCDs: How Cell Phones Resemble Carrots

A smartphone's tiny screen relies on the strange properties of liquid crystals. Check out Groupon's study of LCDs to learn how they create the vivid pictures in your pocket.

The term liquid crystal seems a contradiction, but a liquid crystal is actually neither a liquid nor a solid—it's both, stuck in a sort of chemical limbo with its molecules somewhere between the liquid and solid phases. When an electrical current passes through a liquid crystal, its molecular orientation changes, and so does the direction of light that passes through it. By sandwiching these crystals between polarized glass and manipulating the current passing through them, your phone is able to control the light they channel, resulting in the high-contrast images that appear on screen. Although our brains only see each pixel as a single dot, each consists of red, blue, and green subpixels that, when lit at various intensities, can emit more than 16 million colors.

Despite their advanced applications, liquid crystals are not a recent discovery. They were first identified in the late 19th century by a scientist studying cholesterol extracted from carrots—a natural source of liquid crystals, as are human beings and most other living things, which tend to have them in their cell membranes. Liquid crystals and LCDs were the subject of research and patent applications throughout the early 20th century—including one filed by Marconi’s Wireless Telegraph Company in 1936—and finally hit consumer electronics in the early 1970s, when they were introduced in wristwatches.


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In a Nutshell

Level 3 Certified Repair Technicians provide general repairs on phones or tablets; brands such as Apple, Blackberry, Nokia, and Samsung

The Fine Print

Expires 90 days after purchase. Limit 1 per person, may buy 1 additional as gift. Valid only for option purchased. Lifetime repair guarantee provided for all services. By appointment only (regardless of location); Monday through Friday between 9:00 AM and 5:00 PM. Appointments at the Wexford location will be done "while you wait," while all additional locations will be offering 48-business-hour turn around. Promotional value must be used in one visit and by the same person. Merchant is solely responsible to purchasers for the care and quality of the advertised goods and services.

High-tech products, such as smart phones and GPS receivers