I am interested in designing and building a low-power Raspberry Pi-based palmtop computer to use a (FS)TN monochrome transflective LED-backlit LCD, like that in the HP 300LX or the Psion Series 5. Those devices use a 640x240 (HVGA) resolution. I have found a ton of graphic LCDs up to a resolution of 320x240 (QVGA), including the following:
- https://www.andersdx.com/display-products/?48%5B%5D=FSTN
- https://www.phoenixdisplay.com/product/monochrome-displays/graphic-display/
- https://www.raystar-optronics.com/products.php?func=p_list&sub=filter&lang=eng&pc_parent=253&pc_id_str=11%2C30%2C39%2C48%2C57%2C66%2C75%2C210%2C129%2C111%2C138%2C84%2C400%2C436%2C401%2C228%2C442%2C430%2C336%2C403&pst_id_11_3=%23&pst_id_30=320%C3%97240&pst_id_39=%23&pst_id_48=%23&pst_id_57=%23&pst_id_66=%23&pst_id_75=%23&pst_id_129=%23&pst_id_111_3=%23&pst_id_84=%23&pst_id_400=%23#content
Even the memory LCDs stop at 340x240.
However, it is extremely difficult - I have had no success - finding FSTN graphic LCDs at resolutions higher than 320x240. Why is this so? And are there leads to find an (FS)TN monochrome transflective LED-backlit LCD at a resolution more like 640x240?
I know I could repurpose a display from a late-90s palmtop for my project, create a custom LCD, or use e-ink, but I am curious why the resolution of FSTN graphic LCDs available for purchase nowadays seems to stop at 320x240.
