I’m just used to it working but I don’t understand at all how it works. Like how do the electric signals coming from the computer lead to each individual pixel showing the rexactly right color at the exactly right time?
In: Technology
The screen always expects the pixel data to come in the same order: starting from the top row, from left pixel to the right, then the next row, and so on.
OLED screens have a small capacitor inside each pixel that acts as an analog memory cell: the charge in that capacitor regulates power to the LED. This means that the screen can remember the picture for a brief moment: you can partially charge the capacitor, and then seal the pixel – it will remember the brightness until the next update.
The capacitors are charged or discharged through *column wires*, that run vertically along the screen. *Row wires* control the seal/unseal of the rows: when a row wire is activated, pixels are connected to their column wires. When the wire is deactivated – transistor switches disconnect them.
A controller chip receives the data from the computer and stores it in the internal RAM. When one full row is received, it sets the voltages on column wires and activates one row wire.The capacitors are recharged, changing the brightness of LEDs that are connected to them.
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