Display Power Consumption: CRTs Versus TFT-LCDs

Test CRT And Setup

Iiyama Vision Master Pro 454 (19”, 2003)

We reviewed this monitor in 2002. It was an upper-mainstream 19” unit enabling impressive resolutions and supporting high frequencies of 115 kHz on its DiamondTron tube. This was enough to run up to 1920x1440 at 77 Hz. We used a 1600x1200 resolution at 85 Hz for our testing. Iiyama's specifications say that it consumes up to 145 W. We didn't get that high. At 100% brightness, it pulled just over 100 W.

Sony Multiscan G420 (19”, 2002)

Test Environment

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System HardwareHeader Cell - Column 1
Motherboard (Socket LGA1156)Zotac H55 ITX-WiFi (Rev. 1.0), Chipset: Intel H55, BIOS: 1.3
CPU IntelIntel Core i3-530 (32 nm, 2.93 GHz, 4 x 256 KB L2 and 4 MB L3 Cache, TDP: 73 W)
Display I (CRT)Iiyama Vision Master Pro 454, 1920x1440, 19", 4:3, 115 Hz
Display II (CRT)Sony CPD-G420, 1920x1440, 19", 4:3, 110 Hz
Display I (TFT)Philips 190BW9, 1680x1050, 16:9, 19", TN panel
Display II (TFT)Samsung SyncMaster 245B Plus, 1920x1200, 16:10, 24", TN panel
Display III (TFT)Samsung SyncMaster 204B, 1600x1200, 4:3, 20", TN panel
Display IV (TFT)Acer P225HQL, 1920x1080, 22", 16:9, LED Backlight, TN panel
Display V (TFT)BenQ FP937S, 1280x1024, 4:3, 19", TN panel
RAM2 x 2 GB DDR3-1333 (OCZ3G2000LV4GK 8-8-8-24), dual-channel mode
HDDSeagate Barracuda 7200.11, 500 GB (ST3500320AS),7200 RPM, SATA 3Gb/s, 32 MB Cache
Power SupplyEnermax Pro 82+, EPR425AWT, 425 W
System Software & Drivers
Operating SystemWindows 7 Ultimate x64, Updated on 2010-03-03
Drivers and Settings
Intel Chipset DriversChipset Installation Utility Ver.
Intel Storage DriversMatrix Storage Drivers Ver. 8.​9.​0.​1023
Intel GraphicsIntel Graphics Media Accelerator 15.17

All LCD-based displays operate at their native resolutions and 60 Hz. The CRT display runs at 1600x1200, 85 Hz. Brightness was always set to 100%, which may not be realistic, but it represents the worst-case scenario. The last test results demonstrate power consumption at decreased brightness.