Real pixel is each LED of three red, green, blue LED which constitute a display is only involved in the use of an imaging pixel, in order to obtain sufficient brightness.

Virtual screen is to use software algorithms to control the LED of each color to partcipate in the final number of adjacent pixels of the image, making the lamp with less LED to achieve greater resolution, it can increase four times resolution.

Virtual Pixel Pitch as following picture, the RGB LEDs are placed in average distance, and each LED is considered as a pixel.

Real Pixel pitch as following picture, the RGB LEDs are placed nearby each other to compose a real pixel.