photon78s
Finally installed B140QAN02.0 glossy wqhd screen in T480 that originally came with FHD touchscreen. Replaced display cable to 01YR503 type and had to file down and remove the bottom standoffs from the screen lid in order for the new screen to fit. The wqhd screen is a bit wider on the bottom than the FHD screen where the panel electronics and ribbon cables are located. Screen is on first glance much brighter and more vibrant than any of the FHD panels I've installed previously.
Will add test results here (T480 running stock Linux Mint 21.3 Cinnamon):
Polarization direction: screen is black through polarized sunglasses viewed horizontally. Many other displays is black only when sunglasses are 90 degrees vertical..
300 fps 100% brightness PWM test footage on gray background (unedited out of camera 355 MB video file)
20dB photodetector sensitivity:
This is a better result than the previous T480 compatible FHD panels (see post)
40dB photodetector sensitivity:
No screen I've tested shows flat signal at 40dB sensitivity. Note the 60Hz dips
Screen has poor color spectrum even for LED displays. Ra value is low at 56.7 when sampled on white patch of screen with no software color adjustment.
The R9 value/score (deep red) is extremely low meaning that it cannot reproduce deep red tones accurately.
White patch color spectrum results using QRedshift to adjust color temperature to 3000K (spectrometer reports as 2404K)
:
Pixel flicker is as expected significant when sampled from dark grey patch in lagom's gradient (left side of the upper gradient). This is without any tweaks to linux/compositor/rendering engine/intel graphics registries…
https://imgur.com/a/P4MdyWi
