How to place/add a HD image/picture in background of my game?

Now i am working on a racing game for my final year project and what basically i am try to do is to add a hd image in the background and on that image i can place some buttons so i am doing it with taking cube/quad and applying that image has a texture and pointing camera towards it but problem is that the image is to much blur that even a single word is unreadable so is there any other way to do this my images are attached below need urgent help

thanks in advance