From ff80c9e4ac992ee6cba202dda71432c3fef3ffd2 Mon Sep 17 00:00:00 2001 From: MangaValk Date: Sun, 18 Oct 2026 18:55:26 +0200 Subject: [PATCH] Note row-stripe brightness drift as panel behaviour Co-Authored-By: Claude Opus 5.5 --- docs/README.md | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/docs/README.md b/docs/README.md index 6585913..0d73aa5 100644 --- a/docs/README.md +++ b/docs/README.md @@ -75,9 +75,11 @@ Hardware checks: scope (HS 256 clocks high / 16 low, T6-T8). - [x] VCLK edge phase: with `INVERT_VCLK = false` the image jittered (rising edge on the byte-pair boundary); `true` puts it mid-pair and the jitter is gone. -- [ ] "row stripes" test image: brightness drifts in slow waves. Unexplained; - suspected beat between the alternating full/empty row load and the panel's - DC/DC converter or row drive. +- [x] "row stripes" test image: brightness drifts in slow waves. Panel behaviour, + not the signal: unchanged at 73.7 Hz (260 clocks/row) vs 70.4 Hz, on a 15 V 4 A + Vcc2 supply, while the checkerboard (same average load, spread within each row) + and all other images are stable. Attributed to the panel's drive reacting to + whole rows alternating fully on / fully off; kept 272 clocks/row. - [ ] Confirm the `^ 2` byte order. HS edges sit on word boundaries, so a wrong order does not show on HS; on the panel it shuffles pixels in groups of 8 (a 1-pixel line at x = 0 lands at x = 4).