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Active Mode Discussion Chris Calwell Ecos Consulting Summary of NRDC/Ecos Research Process Reviewed independent monitor research from DisplaySearch, IDC, Europeans, and others Met with monitor manufacturers at COMDEX, CES, DisplaySearch, and one-on-one

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active mode discussion

Active Mode Discussion

Chris Calwell

Ecos Consulting

summary of nrdc ecos research process
Summary of NRDC/Ecos Research Process
  • Reviewed independent monitor research from DisplaySearch, IDC, Europeans, and others
  • Met with monitor manufacturers at COMDEX, CES, DisplaySearch, and one-on-one
  • Analyzed self-reported data from manufacturers in STAR database
  • Independently measured monitor power use
  • Compared data with LBNL, ADL studies
  • Made recommendations to EPA. EPA weighed them with others and created draft specification.
slide3

What Does The Term “Energy Efficient Monitor” Mean?

  • Efficiency = Useful Output or Service Provided / Total Energy Input
  • Useful output or service could be diagonal inches of screen size, square inches of screen size, or total pixels displayed
  • Monitor not displaying information (providing useful output) in sleep or standby modes, so minimize power use at those times to achieve high overall efficiency
  • Can account for all energy use in all three modes separately or with a duty cycle
  • ENERGY STAR seeks to recognize top 25% efficiency
the advantages of pixels watt
The Advantages of Pixels/Watt
  • Pixels/watt approach has a number of key advantages:
  • More technology neutral – avoids difference between viewable screen size and total
  • Screen area (square inches) unknown to consumers
  • Credits CRTs for their present resolution advantage, yet allows for very high resolution options like IBM’s new 9.1 million pixel LCD
  • Emphasizes display quality over physical size
  • Avoids difficulty of trying to estimate a representative “duty cycle” for all monitors
  • Simple, like lumens/watt (lighting) or CFM/watt (fans). Can also be characterized as watts/megapixel
effect of resolution and monitor type on active power consumption for monitors 17 and less
Effect of Resolution and Monitor Type on Active Power Consumption for Monitors 17” and Less
slide7

Effect of Resolution and Monitor Type on Active Power Consumption for Monitors Greater than 17”

need for consistent measurement
Need for Consistent Measurement
  • STAR database contains self-reported data from manufacturers
  • Not all monitors measured under identical conditions in active or “on” mode
  • Depending on user settings and image displayed, CRT power variations can be +/- 30%. LCD variations can be +/- 50%.
  • ENERGY STAR has helped develop common test methods to the ventilation and lighting industries – may be able to bring standardization to monitor measurements as well.
key market research findings
Key Market Research Findings
  • Laptops were first major market for LCD technology; Desktops now shifting decisively from CRTs to LCDs
  • LCDs provide size, weight, comfort, clarity, and energy advantages to users. Even better technologies (OLEDs, others) coming soon
  • LCDs are often more profitable for manufacturers to sell (CRTs have become a commodity)
  • Presently hard to market LCDs on an energy efficiency basis – virtually all monitors have ENERGY STAR® label and no standardized power use information is shown on packaging
  • Need for a new specification and test method to fairly compare monitors on total energy use in active, sleep and off modes.