AVS Forum Special Member
Join Date: Jun 2005
Location: Northern, VA - Washington, DC
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I think the OP is asking the wrong question.
Resolution is NOT the question. If you have a garbage video, it will look like garbage, regardless of the projector that it is showing on.
But, as video quality improves, there is still a step, which is of significant importance, and that is the quality of the video processor that is in the projector itself. This used to be a very common test with displays to use lower quality DVD content, and then run it through a HDTV and see how the lower resolution was handled by the display. I haven't seen this test in a while, but it is the main crux of the question.
The answer is that your LG 4K display is NOT the issue, but the video processing of the display you have isn't up to the task of dealing with lower resolution content.
When people pay more for displays, that is one of those costs that they often ask about.
"Why am I paying more for this display?" - "It has better video processing!" - "Why would I care about that?"
Now you know why you care about that.
Your 4K LG doesn't look bad with lower resolution content because of the resolution of the displays.
It looks bad because the video processing isn't as good as it needs to be to convert that lower resolution up to 4K smoothly.
Same is going to be the case with projectors and it really depends on the projector in use as to whether or not you get any real quality boost from the onboard video processing with low-quality content. Some may do a very good job, and some will not. Unfortunately, that's not a test I often go through when I try my displays out because the lowest quality I go with may be 720p HDTV or 1080i, from the cable box. When I stream from the Internet, off of YouTube or similar, I am not looking for, nor expecting quality video and I don't look at my display and blame the display for the cruddy video. I don't blame YouTube either. I blame myself for choosing to put cruddy video on my display.
Garbage in... garbage out.
Blaming your display for your poor choice of video content is ludicrous. If you have a projector, don't stream weak content from the Internet. Get good quality HD content and see how it performs.
That said, there are some excellent 1080p projectors out there which are almost a steal these days. They have great optics and fully developed processing engine with years of engineering behind them and an industry that is almost fully saturated in the resolution.
4K is an toddler technology by comparison with weak content support, so-so processing, and poor industry coherence on standardization and information. Especially when we get to the best quality HDR content.
AV Integrated - Theater, whole house audio, and technology installation in the Washington DC metro area.