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It's very uncommon to find a monitor or TV that actually does non filtered integer scaling, most apply a blurry bilinear scale that looks awful. And afaik there are no external HDMI pixel doublers on the market, I would buy one in a heartbeat.

Native 720p does look slightly better than integer scaling to 2x because of subpixel stuff, and generally liking that LCD look. But integer scaling would be enough really.

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> And afaik there are no external HDMI pixel doublers on the market, I would buy one in a heartbeat.

Sounds like a fun project, you should build one.

I did look into it a little bit, I think the reason none exist is because it's actually pretty difficult.

Taking in a 720p hdmi signal and pixel doubling to 1440p or tripling to 4k and outputting that as a valid HDMI signal without adding more than a frame or two of lag would require custom chips. Although maybe a software solution involving a gpu might be possible?

FPGA is probably a safer bet if you want to minimize latency.

Implementation is left an as exercise for the reader.

Interesting. Did you investigate FPGAs?

Take a look at the HDFury products. The X4 should do what you need with those lower resolutions.

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