Steve Jobs did a great job at Apple, but he also changed the world. A simple
7-segment display is not enough for even the most simple of applicatio today;
custome are asking for bigger displays with more impressive graphics.
Marketing teams are therefore asking engineering teams to implement this on the
next generation of products. This is true for many applicatio, such as coffee
machines, ove, factory automation and household boile, and is naturally
presenting a new and interesting challenge for engineering teams. So the simple
question is how to add a display into your application?
Let us fit have a look at what different optio you have in picking a
display. There are lots of TLA’s (three letter acronyms) used in the industry
which are actually very simple but can lead to a bit of confusion.
Everyone in the engineering community is familiar with the Liquid Crystal
Display (LCD) concept; even if they have subsequently moved to the dark side and
are now working in “sales” they will likely remember the calculator that they
once had to use for real work, that had an LCD screen on it.
The basic concept is very simple. A layer of liquid crystals is arranged
between two polarized laye (at 90 degrees to each other), such that without
the liquid crystal, no light would pass through at all, but the crystal is
arranged in a kind of helix pattern which rotates the polarization of the light
between the two polarized scree, meaning all the light can pass though.
However, when an electric charge is applied to the liquid crystals they unroll
or straighten out, thus no longer rotating the light and will appear black.