The simple Diode and LED Tester presented here costs under £5 to build (including all components, the battery and a cheap case) and will indicate the polarity of almost all types of LED and other ...
The tl;dr is that if all you care about is picture quality, OLED is the way to go. If you want something extremely large (100-plus inches), extremely bright (too much ambient light in your room), or ...
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