The Sony VAIO P used an unusually wide 1600 x 768 LVDS panel. Reusing that display means solving more than connector fit: the panel needs correctly timed video, LVDS signaling, backlight control, and a mechanical plan for the rest of the computer.
Project Koyomi began with a Raspberry Pi HAT designed to test that display before committing to a complete replacement motherboard.
The display path
The Raspberry Pi exposes parallel DPI video over GPIO. A Texas Instruments SN75LVDS83B converts those RGB signals into LVDS for the Toshiba LT080EE04100 panel. The display connects through an I-PEX 20374-series 30-position connector.
Because DPI consumes the normal hardware I²C pins, the test setup uses software I²C on GPIO 23 and 24 for backlight control.
Shrinking the board
The original HAT format was useful for proving the display path. The compact R2.6 variant replaces the 2 x 20 Pi header with a 40-contact FH41 FFC and reduces the board to 65.0 x 28.25 mm while keeping all 23 fitted parts on one side.
The production-candidate directory includes KiCad source, rendered views, a STEP model, DRC/ERC output, interface audits, and a checksumed manufacturing package.
R2.7 explores a still smaller 58.0 x 22.2 mm base. Its placement is mechanically clear, but its 138 connections are intentionally unrouted. It is documented as a floorplan—not quietly presented as a manufacturable revision.
Explore the public Koyomi project page or inspect the canonical source on GitHub.