Apple Thunderbolt display vs iMac

[Unimodule]

What is the difference in picture quality between a 27in iMac and a 27in Apple Thunderbolt display?

 

[wrinkster22]

What is the difference in picture quality between a 27in iMac and a 27in Apple Thunderbolt display?

They are the same panel so there is no difference.

 

[S.B.G]

Thunderbolt Display:

Technical Specifications

Screen size: 27 inches (diagonal viewable)
Screen type: TFT active-matrix LCD with in-plane switching (IPS)
Resolution: 2560 by 1440 pixels
Colors: 16.7 million
Aspect ratio: 16:9
Viewing angle: 178° horizontal; 178° vertical
Brightness: 375 cd/m2
Contrast ratio: 1000:1
Response time: 12 ms

iMac display:

27-inch (viewable) LED-backlit glossy widescreen TFT display with support for millions of colors
Resolution: 2560 by 1440 pixels

 

[CWallace]

I own both (the ATD is my iMac's second monitor) and I cannot tell a difference between them.