I bought several inexpensive tablets in a range of sizes. Each is from a different manufacturer. I have not taken them apart, but using a magnifying glass, I can tell that each screen appears to be using a slightly different LCD (LED illuminated) manufacturing processes.
What is common across all the screens is that viewing them straight-on is not the best viewing angle. Tilting them about 10 degrees generates the best results.
What's interesting is that, historically, you needed to view inexpensive LCD (LED illuminated) screens straight-on for the best results. Any angle diverging from straight-on resulted in poor image quality.
What has changed in LCD (LED illuminated) manufacturing technology that viewing them straight-on is no longer the best angle?