Red LED displays

[Katie Wasserman]

(02-12-2014 04:29 PM)Jim Horn Wrote:  But that is not to be. Seven segment displays that will fit are apparently no longer available from *any* source I've been able to identify. The world has moved on to LCD, OLED and other ideas. While Avago (HP => Agilent => spinoffs) still makes small 5x7 dot matrix displays, they won't fit enough digits in the case - and cost a small fortune anyway.

If anyone is aware of good displays for this, please let us all know!

I've considered doing this too. I would use the Avago alpha-numeric displays The serial interface, 5x7 dot matrix, color choice, small size and high efficiency look great for calculator use. Using the .15" height displays you should be able to get a 1 x 8 display + 1 x 4 display into the display space on HP Classic series calculator -- maybe not the Woodstocks, though. There's no magnifier bubble but I think a .15" display would be readable from about the same distance as the original 7-segment display (with bubble).

They are kind of expensive but not terrible.

[edit]

More on this...

Osram make a line of display similar to Avago's. The 1414 4-digit display here, should end-to-end stack to be 53.34mm when 3 are used. The Woodstock's display is just over 55mm so they should fit. But the small Avago display's are exactly the same size so they should fit too.