4 digits 7 segments blinking problem

hi,
i use 5461bs 4 digit 7 seg module. i can display on each of the 4 digit , but i am having problem when i want to use all of them one after the other in order to get 4 digits number display.
i get blinking display of the digits instead of stable one as expected , even that the delay is: delay(2);
how can i get it work without blinking?

my code is attached.

four_7seg.ino (3.77 KB)

Wiring diagram?

Read the instructions for posting.

Note particularly point 7.

Define "blinking". Or better yet, post a video.

Do you like to acquire the principles of programming a '4-digit CC7SD type multiplexed display unit' of the following figure? You may consult this post.
4digit7seg.png

4digit7seg.png