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

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Discussion Overview

The discussion revolves around the possibility of converting a non-backlit LCD in a TI-89 graphing calculator into a backlit version. Participants explore various ideas and methods to enhance visibility in low-light conditions, including references to other calculator models and modifications.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about methods to retrofit a non-backlit LCD with backlighting, expressing frustration with visibility in dim lighting.
  • One participant suggests that there is no practical way to achieve this modification, questioning if there are any contrast or viewing angle adjustments available in the calculator's menus.
  • Another participant claims it is possible to backlight a TI-86 calculator using an electroluminescent (EL) panel, implying a potential method for similar modifications.
  • A later reply requests additional information, specifically pictures and links related to the modification process.
  • One participant provides links to demo pictures and instructions for modifying other calculators, indicating resources for further exploration.

Areas of Agreement / Disagreement

Participants express varying opinions on the feasibility of modifying the TI-89 for backlighting. While some suggest possible methods, others remain skeptical about the practicality of such modifications. No consensus is reached regarding a definitive solution.

Contextual Notes

Limitations include the lack of detailed technical specifications for the TI-89 and the absence of confirmed methods for backlighting this specific model. The discussion also relies on anecdotal evidence from modifications of other calculator models.

JerryG
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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.
 
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JerryG said:
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?
 
JerryG said:
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.
 
ranger said:
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! :smile:
 
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