Turn Non-Backlit LCD Into Backlit LCD | TI-89 Graphing Calculator

[JerryG]

Is there a way to turn a non-backlit LCD into a backlit LCD? My TI-89 graphing calculator is difficult to see in dim lighting. Got any ideas? You would think that by now, TI and HP would have some color/backlit LCDs on the calculators.

 

[berkeman]

Is there a way to turn a non-backlit LCD into a backlit LCD? My TI-89 graphing calculator is difficult to see in dim lighting. Got any ideas? You would think that by now, TI and HP would have some color/backlit LCDs on the calculators.

There's no practical way that I know of. Is there a contrast/viewing angle adjustment for the display in the menus?

 

[ranger]

Is there a way to turn a non-backlit LCD into a backlit LCD? My TI-89 graphing calculator is difficult to see in dim lighting. Got any ideas? You would think that by now, TI and HP would have some color/backlit LCDs on the calculators.

I know that its possible to make a TI86 calc with backlight by using an electroluminescent (EL) panel.

 

[berkeman]

I know that its possible to make a TI86 calc with backlight by using an electroluminescent (EL) panel.

Well that's kind of a teaser ranger! We need pictures and links!

 

[ranger]

Well that's kind of a teaser ranger! We need pictures and links!

Woops! Forgot to attach some demo pics and instructions :shy:
http://web.archive.org/web/20010125213600/http://www.genetech.net/dknaack/
http://web.archive.org/web/20080523123622rn_1/www.michaelv.org/programs/calcs/calc_mods.php