Output the picture on Maixduino screen

I just begin to learn the Maixpy
May I ask how to output the picture or graph on Maixduino screen
My firmware is maixpy_v0.6.2_44_gd9dc6c58c_with_lvgl.bin
Is lvgl necessary?
I have seen the example here, but it was blank.:disappointed_relieved::disappointed_relieved: