With the HyperPixel 4.0 Square, Pimoroni has developed a comparatively high-resolution display, especially for single-board computers like the Raspberry Pi. The model supports capacitive input too has a resolution of 720 x 720 pixels with a pixel density of 254 PPI.
https://www.notebookcheck.net/HyperPixel-A-High-resolution-touch-display-for-the-Raspberry-Pi.454507.0.html