They aren’t attached.
More accurately the ‘screen’ is a series of layers. Generally you will have the backlight, the diffuser, the pixels(liquid Crystal based), and then the front glass/cover and some other layers as needed.
These layers could just be placed next to each other and work but for durability/reliability they are often glued together in some way.
If you’re interested in how the pixel layer is made let me know and I can go into that as well. In short: microfabrication.
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