Apple Thunderbolt Display - Technical Specifications

* 27-inch (diagonal viewable image size) thin film transistor (TFT) active-matrix liquid crystal display (LCD) with in-plane switching (IPS)
* Resolution: 2560 by 1440 pixels
* Colors (maximum): 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

https://support.apple.com/en-us/112597