What produces the light to make images on a television or computer screen?
Answers
cathod ray discharged tube
Being pedantic, it doesn't.
The GPU (Graphics Processing Unit) constructs an image in the video frame buffer (I think) pixel by pixel (pixel = picture element — pix el). Once the frame buffer is full, that data is pushed to the correct port (HDMI, DVI et al).
The monitor receives the data and, with an LCD (Liquid Crystal Display) monitor, activates or deactivated the corresponding LCD cell with the correct current to produce the required colour.
For an HD — 1,920 x 1,080 — display that is 2,077,036 pixels and for a UHD (4K) — 3,840 x 2,160 — display that is 8,294,400 pixels. These are refreshed at either 30 fps or 60 fps (frames per second) depending on the configuration of the system.
In short, the GPU constructs an image of between 2,077,036 and 8,294,400 pixels and pushes that to the correct port between 30 and 60 times a second…
It is exceptionally computationally intensive, hence why most systems have a dedicated GPU and large amount video memory.