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6-post thread, 6 images, HIGHEST engagement NOTimothyLottes thread in
corpus (98 likes, 18 reposts, 12960 views). CRT emulation on LCDs can
trigger LCD hardware bugs - Steam Deck example: 2x1 {G,RB} checker
inside a window affects the scan outside the window (Deck scan is
90deg rotated). Theory: 90deg scan gives {(bottom)R, G, B (top)}
sub-pixel components; alternate {G,RB} per pixel for new sub-pixel
pattern at different virtual resolution. Linear-energy-conserving in
theory, breaks down in practice. Tangent post 6 from
@realtimekeith on voltage-inversion crosstalk varying across TN/IPS/VA.
112 lines
4.3 KiB
JSON
112 lines
4.3 KiB
JSON
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"post_id": "1688491417109196800",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "CRT emulation on LCDs can be hard. For example it's often easy to generate a pattern that causes a LCD hardware bug. NOT joking. Here is an example on the Steam Deck. The pattern in the window affects the scan (Deck scan is rotated) outside the window.",
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"timestamp": "2023-08-07 10:04:59",
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"post_id": "1688492237775142912",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "The actual pattern is this (it's a 2x1 pixel checker of {G,RB}).",
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"timestamp": "2023-08-07 10:08:14",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "The theory: Deck's 90deg scan results in {(bottom)R, G, B (top)} sub-pixel components. So could alternate {G,RB} only per pixel in a checker pattern to generate a new sub-pixel pattern at a different resolution. In this case trying for 640x400 virtual resolution.",
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"timestamp": "2023-08-07 10:14:00",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "For virtual pixel, shift energy into masked virtual phosphor. So 50% brightness red, would be {100%, 0%} for {in, out} of phosphor pixels. Over 50% one starts to increase non-phosphor pixels until some maximum so mask is still visible, but brightness isn't too compromised.",
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"timestamp": "2023-08-07 10:18:28",
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"author": "NOTimothyLottes",
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"handle": "NOTimothyLottes",
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"text": "Of course this is done in linear, so it's energy conserving in theory. But when the panel fails, it breaks down and doesn't work. I see this problem on a bunch of different devices. My personal AMD laptop has the exact same fail case (but rotated differently).",
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"timestamp": "2023-08-07 10:23:35",
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"post_id": "1689479056448684032",
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"author": "Blur Busters",
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"handle": "BlurBusters",
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"text": "@NOTimothyLottes Very interesting \"crosstalk from voltage inversion\" artifact. Some repeating patterns or flicker patterns can trigger crosstalk artifacts too. Behavior varies a lot between TN, IPS, and VA, but all of them have to alternate voltage polarity spatially and temporally.",
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"timestamp": "2023-08-10 03:29:30",
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