Is the connector the only difference between a Cinema Display and a Thunderbolt Display, or are there other features that changed between the two models as well?
Is the connector the only difference between a Cinema Display and a Thunderbolt Display
cinema-displayhardwarethunderbolt-display
Related Solutions
Your calculation is solid. Everywhere I've seen it 109 PPI (which is probably what you intend with DPI) is what people report for the Thunderbolt Cinema Display:
The TUAW article has this nice picture to catalog various pixels per inch densities:
The linked article above even has a Google-hosted spreadsheet with details on the data behind the table.
There's no good way to open it. Use a Dremel to carefully cut around the seam until it was thin enough to crack apart.
There's one huge capacitor (Rubycon KXW 450V 150 uF) that needs to be discharged before the power supply will start up.
Be careful, because it's charged to over 100 volts. Solder a 600 k ohm resistor across it to bleed off the charge a little faster.
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Best Answer
The Thunderbolt monitor includes a number of integrated peripherals as well as being a monitor:
The actual connector for MiniDisplayPort and Thunderbolt is the same, but Thunderbolt can pass many protocols over the same cable, not just A/V signals.