Next time, you must remember to go to a regular place to buy a large size. Don't just go to the rented booth. Be sure to go to a special brand store.

You can ask him to return it. You can tell him that I am not satisfied with the quality of the picture.

Actually, I think it's psychological. You can go to other computers to see, the computer's graphics card configuration is different, and the effect is naturally different. So is the player, a player and an effect monitor. You can connect the TV to see if it's ok. If you are not satisfied, ask him for a guarantee to exchange.