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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?

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    I think your premise is incorrect. I've seen spec sheets for old monochrome LCD panels, and they had an optimal viewing angle slightly below orthogonal.
    – sawdust
    Dec 12, 2015 at 6:54
  • @sawdust That's very interesting. Were those specs for illuminated or reflective displays? BTW, I think I convoluted the issue by interchangeably using LCD and LED, when I really meant LED. Dec 12, 2015 at 7:14
  • The spec sheets were for reflective panels. Backlighting was quite rare back then. BTW please avoid using "LED" for "LCD with LED backlighting". To promote the backlight method to the status of the display technology is misleading, and is purely a marketing (not a technical) terminology.
    – sawdust
    Dec 12, 2015 at 7:43
  • @sawdust You are correct. When I submitted this question, I used LCD most of the time. Then I read your comment, which made me realize that using LCD was a bit misleading because I'm not talking about old reflective panels. I'll try another edit to see if I can improve the wording. :-) Dec 12, 2015 at 7:56
  • Yes, LED backlighting has nothing to do with this issue. Look into TN LCD screen technology, which is cheap, versus something like IPS screens, which have much larger viewing angles. tnpanel.com/tn-vs-ips-va
    – paradroid
    Dec 12, 2015 at 7:57

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