how lcds work - document camera with built in projector

Backlit vs.
External light sources are required for our simple LCD.
The liquid crystal material itself does not shine.
Small and cheap LCD displays are usually reflective, meaning they have to reflect light from an external light source to show anything.
Look at the LCD watch: small electrodes charge the liquid crystal and unlock the layer so that the light is not transmitted through the polarized film and the numbers appear.
Most computer monitors are built in.
Above, next to, and sometimes in the fluorescent tube behind the LCD.
The white diffuse panel at the back of the LCD redirects and scatter the light evenly to ensure that the display is uniform.
In the process of passing through the filter, the liquid crystal layer and the electrode layer, a lot of this light is lost-
More than half often!
In our case, we have a common electrode plane and a single electrode rod that controls the liquid crystal's reaction to the charge.
If you add some layers that contain a single electrode, you can start making more complex displays. Common-plane-
LCD-based displays are good for simple displays that need to display the same information over and over again.
Watches and microwave timers fall into this category.
Although the hexagonal bar shown earlier is the most common form of electrode arrangement in this device, almost any shape is possible.
Take a look at some cheap handheld games: playing cards, aliens, fish and slot machines are just some electrode shapes you'll see.