Weired Gameboy Shader on AMOLED Device like Galaxy S10

Hi. I have some problem with gameboy shader with AMOLED device.

As you see, This is gameboy dmg shader(in handheld folder). On my galaxy s10, There are several problems for showing shader(blurry dots, not green dots but inky black dots, blurry grids…). So i wonder why this is happenning. I also have Sony Xperia which has LCD screen and it shows amazing sharp grid and exact colors for same shader. Is there anyone have this problem like this?