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ENERGY STAR Most Efficient 2015 — Computer Monitors 20 to 23 inches

ENERGY STAR Most Efficient in 2015The ENERGY STAR Most Efficient 2015 designation recognizes the most efficient products among those that qualify for the ENERGY STAR program. These exceptional computer monitors represent the leading edge in energy efficient products this year. Access the full ENERGY STAR Most Efficient qualified products list in Excel.

View computer monitors under 20 inches

View computer monitors over 23 inches

Screen Size (Inches) 21.5

This Philips USB monitor is ideal for usage in mobile clinical environments where AC power may not be conveniently accessible. Simply connect it with a single USB cable form your notebook to deliver video and power.

Resolution 1080 x 1920
Display Type TFT LCD
Annual Energy Use (kWh)* 16
Annual Operation Cost** $1.84
MSRP $303.32
CX model 21.5WCX
Screen Size (Inches) 21.5


  • Signal Compatibility 1080p,1080i,720p,480p,480i
  • Panel Resolution 1920×1080(1080p)
  • Panel Type 21.5" TFT LCD
  • Backlight Type LED
  • Backlight Rated Hours 30000
  • Refresh Rate 60Hz
  • Brightness 300cd/m2
  • Contrast Ratio (Native,Dynamic) 1000:1(typical)
  • Response Time 5ms(typical)
  • Colors 16.7M
  • Viewing Angel(H/V) 170/160
Resolution 1080 x 1920
Display Type TN LCD
Annual Energy Use (kWh)* 20
Annual Operation Cost** $2.32
MSRP $210
EIZO model FlexScan S2133
FlexScan S2133
Screen Size (Inches) 21.3

With its IPS panel and 1600 x1200, resolution, the FlexScan S2133 is ideal for businesses and control rooms that need to display a large volume of data as well as for CAD and other design work that require brilliant color display.

Resolution 1200 x 1600
Display Type IPS LCD
Annual Energy Use (kWh)* 22
Annual Operation Cost** $2.56
*Based on 4 hours of active use a day.
**Based on a 2012 national average cost of 11.5 cents per kilowatt-hour of electricity.