From TSG Doc
Jump to: navigation, search

The standard lab monitor is the Benq XL2420Z. For support monitors, the Dell Professional P2213 and the Dell Ultrasharp U2312HM are used. For experiments requiring touch-based interaction with the display, an ELO capacitive monitor can be made available.


Image: 200 pixels Image: 200 pixels Image: 200 pixels Image: 200 pixels
Benq XL2420Z Dell Professional P2213 Dell Ultrasharp U2312HM ELO 2244L
Screen Size (diagonal) 24" 22" 23" 21.5"
Aspect Ratio 16:9 16:10 16:9 16:9
Resolution 1920 * 1080 1680 * 1050 1920 * 1080 1920 * 1080
Pixel Pitch (mm) 0.276 0.282 0.265 0.248
Brightness (cd/m2) [fn 1] 350 250 350 250
Contrast [fn 1] 1000:1 1000:1 1000:1 1000:1
Panel Type TN TN IPS TN
Viewing Angle (horizontal/vertical) [fn 1] 170°/160° 170°/160° 178°/178° 178°/178°
Vert. Refresh Rate (Hz) 120[fn 2] 60 60 60
Response Time GtG (ms) [fn 1] 1 5 8 14
Display Colors 16.7 mln 16.7 mln 16.7 mln 16.7 mln
Color Gamut [fn 1] 72% 83% 82%
Touch No No No Yes, capacitive
Display Connections D-Sub, DVI-DL, HDMI *2, DisplayPort D-Sub, DVI-D, DisplayPort D-Sub, DVI-D, DisplayPort D-Sub, DVI
Other Connections Headphone jack, USB 2.0 Hub USB 2.0 Hub Headphone jack, USB 2.0 Hub USB 2.0 Hub
  1. 1.0 1.1 1.2 1.3 1.4 As specified by manufacturer, measured values may differ.
  2. Default value. Maximum refresh rate is 144 Hz.


Our Benq XL2429Z lab monitors are individually color-calibrated using a Datacolor Spyder4 Elite colorimeter, based on a fixed hardware profile as specified below. This calibration is used to normalize the color representation of all lab monitors, which allows users to transfer their stimuli from one lab to the other with a minimized change in color perception. The color profile for each monitor will be automatically loaded or refreshed when a user logs into Windows, and will be periodically updated to provide the best possible representation of the ICC standard the monitor's display panel can deliver.

Benq XL2420Z
Hardware Settings  
Picture Mode sRGB
Brightness 31 (~200 lumen)
Contrast 50
Gamma 5


The color profile should be pre-installed on all lab computers and cannot be changed by the default user. Contact our Administrator if you are not sure whether the correct profile is loaded.

KVM Switches

Aten CS1642 KVM Switch

A KVM switch is a hardware device that allows a user to control multiple computers from one or more sets of keyboards, monitors and mice.

Aten CS1642


Motion blur reduction

full persistence mode shows a steady image
low persistence mode ('blur reduction') shows a pulsed image

By default the Benq XL2420Z is in 120 Hz mode. This means that the minimum time that a stimulus is shown is 8.3 ms. The monitor menu, reachable with the touch buttons on the right side of the monitor has a blur reduction setting. This changes the backlighting of the LCD screen in such a way that it is lighted only a quarter of the time. A stimulus present on the screen for one frame will now be visible for only 2ms.

This setting is useful when the participant is moving with respect to the screen or is watching a moving object on the screen. The perceived blur will be reduced with 75%.

See for more information on (motion) blur.

Additionally the setting is useful when not only the onset (moment of appearing) but the moment the object is perceived is important. Do note that the latency of the onset does not change.