Repair of Back of iPhone, New Battery for iPhone, or $25 for $50 Worth of Cellphone Repair at CPR Cell Phone Repair

Homewood, Birmingham

Give as a Gift
Over 50 bought
Limited quantity available

Cell phones are more popular than ever thanks to cool apps such as Friend Party and FindMeAGarbageCan. Satisfy your app-etite with this Groupon.

Choose from Three Options

  • $25 for $50 worth of cellphone repair
  • $15 for repair and replacement of the back of an iPhone 4 or 4s ($39.99 value)
  • $25 for battery replacement on an iPhone 4, 4s, or 5 ($50 value)

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.

In a Nutshell

Techs specialize in cellphone and smartphone repair, with an emphasis on glass and battery replacement as well as issues like broken LCDs

The Fine Print

Expires 180 days after purchase. Limit 1 per person, may buy 1 additional as a gift. Limit 1 per visit. Valid only for option purchased. Back glass repair valid for white or black iPhones only. 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

All Locations

  • Homewood (648.3 miles)

    231 State Farm Pkwy.

    Suite 109

    Birmingham, Alabama 35209

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