Answer:
More pixels
Step-by-step explanation:
Pixel is the unit that represents one dot on your screen. Any screen is made of many dots and the combination of that dots that will show your picture. When someone said 1920x1080 resolution that means there are 1920 dots aligned horizontally and 1080 dots aligned vertically of that product.
The limit for the perceptible difference of pixels for human eyes around 300 pixels per inch density. A device that was seen from far like television will need a higher resolution compared to a smartphone that we see at a closer range.