Don’t explain me what they are i wanna know how they’re made and how they work. Do they make millions of little lights? Is each pixel connected to a chip? Why don’t you need a nasa computer to orchestrate each position of a picture [_] times per second (frames)
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OLED displays do have a small light in each subpixel. LCD screens do not: they change their transparency instead, and they require a backlight lamp installed on the other side.
The entire display is essentially one big chip. Each subpixel has its own small power regulator, controlled by its own analog memory cell. The memory cell is essentially a tiny, very weak battery (capacitor, to be exact). Its only job is to store a brightness level as charge, and provide it to a power regulator.
Each memory cell is connected to a “charge” wire, that runs through the entire screen. This connection is blocked by two electric valves, controlled by “row select” and “column select” wires. To set a brightness of a pixel, you put voltage on one of “row selects”, and one of “column selects” and then you put new brightness level on the “charge” wire. The display controller does that each frame for every pixel on the screen.
Displays are produced the same way other chips are produced:
1. the surface is covered with a special paint
2. a “photo” of the chip is projected on the paint. The paint dissolves, if hit by light from a photo
3. the display is submerged into chemical, or is shot with chemicals from a particle gun. The chemical only reacts with parts that are not covered by paint
4. the paint is dissolved and removed
5. the process is repeated with a different photo and a different chemical – each adds another “layer” to the final circuit.
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