Calculator Woes: Dark Spots and Viscous Liquid on Screens.

[Jeff_Birt]

Many older LCDs will develop leaks between the two pieces of glass which results in dark spots that look like ink. Eventually it will cover the whole surface. There are some replacement LCDS made for certain Sharp calculators/pocket computers now.

The polarizer film can also darken and detach from the front and/or back surface of the glass. The front polarizer failure tends to look like a cloudy patch starting in the middle and spreading out. The rear polarizer also has a silver reflective backing which can sperate and/or get lots of small black spots on it. You can obtain new polarizing films, but they can be a bit tricky to put on.

https://polarizingsheet.com/lcd-polarizing-sheet.php