To choose a good screen for a tablet, we must consider the pixel density, the type of screen and, of course, the resolution.
The main types of screens are LCD and AMOLED, however, high-end tablets often come with AMOLED screens. LCDs are thin, light and have low refresh rate flicker, while AMOLEDs emit light directly thanks to their active-matrix light emitting diodes, thus giving much higher contrast ratios.