Hardware Reference
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added, it became the perfect screen for calculators. An example is shown in
Figure 11-1.
Figure 11-1:
LCD screen of a calculator, displaying numbers
Although this works great for numbers, it doesn't work as well for letters. Some
letters can be approximated, and some words can be guessed. Hands up; how
many of you used calculators to write words? For example, entering 77345993
on a calculator and turning it upside down for EGGSHELL? I did.
To allow letters to be printed, the previous system was modii ed, adding
more segments. This did indeed work, even if it increased the complexity of
the LCD screen and the electronics needed to control it. It still wasn't perfect,
and some letters were slightly difi cult to read: for example, the letter V. Also,
it did not allow for uppercase and lowercase letters to coexist; only uppercase
letters were displayed and not every lowercase letter could be easily displayed.
An example is shown in Figure 11-2.
Figure 11-2:
LCD screen showing text
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