HP-45 Green LED display

[LEDfan]

Blue would look good, I can certainly see the appeal, especially if it gets a HP-35 with a failed display fully working again. Those original displays seem hard to get hold of; it took me a while to get hold of one to replace one of mine with a missing segment.

Personally I like the style of the 1970s LED display, mainly due to nostalgia and my calculators during school days (sadly not HP), but wish that the development of LEDs had been such that there was greater colour choice, hence my interest in the HP-45 with the green display.

There’s a few people who have developed TIL305 clones in a range of colours, but the form factor of this 5x7 matrix LED display lends itself to modern LEDs, and is still a relatively common display due to its long product lifecycle.

Blackjetrock’s current project with the HP-41 and the pico is interesting to me, as it uses an OLED display to show a copy of the calculator display, and could theoretically be used to replace the original LCD. I no longer have my HP-41C, as the LCD failed, and I sold on for spares. I like the idea of an HP-41 with a LED display.