Hi DiTBho,
The IBM display seems obscure but the other ones have some detailed specs on PanelLook.com, you can use the tool to find some decent brighter xga displays that have wled backlights. Amazon has a few too that are 12.1 in and 1024x768 that would likely fit made by VSDisplay. I’ve ordered one for mine since the cathode backlight is getting very weak on mine.
LCD Cable - IBM, Apple part number922-5087
TFT Panel - IBM 03L5040 (BL P/N:03L5090)
LCD Cable - LG, Apple part number 922-5368
TFT Panel - LG LP121SA (A2QT)
LCD Cable - Samsung, Apple part number 922-4769
TFT Panel - Samsung LT121SU-123
As noted elsewhere, the commonality of displays (and matching cables) for the clamshells is Samsung was reported to be a plurality or a majority of all produced, followed by IBM, and lastly, LG.
Of the several iBook clamshells to come into my possession over the years, all but one was supplied with the Samsung combination. The other was IBM (in an indigo 366).
At least, with respect to OEM display performance, discolouration, as both backlight phosphors and anti-glare protecting laminate, plagued the Samsung displays (pinkish when display was newly powered on, yellowing in the laminate, etc.). The IBM display had an issue with occasional stuck/failed pixels appearing over time, but otherwise maintaining colour integrity and luminosity better than the Samsungs.
All LG displays I’ve used have come from post-clamshell iBooks, PowerBooks, and MacBook Pros; at minimum, these were at least XGAresolution or greater. This includes the LG XGA display which, ultimately, went into my key lime 466.