Why do screens have refresh rates?
Show answer & explanation
Answer: Create smooth motion illusion
Create smooth motion illusion ✓ — Correct! Refresh rate (Hz) measures screen redraws per second. 60Hz = 60 frames/second. Higher rates (120Hz, 144Hz) make motion smoother—less blur, more responsive. Our eyes perceive rapid still images as motion (persistence of vision). Low refresh rates cause flicker or stutter. Gaming monitors use high refresh for smooth gameplay. Most movies are 24fps, but displays refresh faster to reduce flicker!
Save battery power — Wrong. Lower refresh can save battery, but primary purpose is creating smooth motion by rapidly updating displayed images.
Increase display brightness — Wrong. Refresh rate doesn't affect brightness. It controls update frequency—how many times per second the screen redraws the image.