After simulated the text in different screen resolution and compare to the images. It's sad to acknowledge that a quad-sized screen resolution (640x960) is not possible to be happened on it.
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It's more sad that unchanged resolution (320x480) is also possible as the font clearness is kinda similar to the screen in the video.
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Even if the screen shown in the video has a higher resolution, it seems more likely that it's only about 1.5x (480x720) for a reasonable pixel scale up without affecting current applications.
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