Monitorspecrevision classlecture notes.ppt

Monitorspecrevision classlecture notes.ppt

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  1 Proposed ENERGY STAR Specificationsfor Computer Monitors Craig W. Hershberg ENERGY STAR Office Equipment and Consumer Electronics www.energystar.gov
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  2 Agenda Computer monitor specification •Objectives • History • Specification highlights • Industry feedback • Next steps • Questions from EU - EPA agreement • Your comments / questions • Our questions for you
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  3 Agenda (cont’d) • Doyou need specifics ? – Sleep, Off , On, Non-energy aspects • Test method • The time is right - LCDs
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  4 Agenda (cont’d) Logistics andother issues • How to collaborate when revising the specifications • Subsequent meetings • Summary of meeting, including action items and schedule for follow-up • Preliminary plans for other Office Equipment Products – procedure for collaboration
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  5 Objectives • Provide understandingand disclosure of draft monitor specification • Provide detailed answers to questions • Receive constructive feedback from you • Develop consensus on direction identified today • Agree on next steps
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  6 The history: • Whatmonitor specs. exist in Europe now ? – GEEA – TCO • Reviewed independent monitor research from DisplaySearch, IDC, Europeans, and others • Met with monitor manufacturers at COMDEX, CES, DisplaySearch, and one-on-one (HANS-PAUL) • 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.
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  7 Revising the ENERGYSTAR Computer Monitor Specification: Highlights
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  8 Terminology ON: “active”, “fullpower” SLEEP: After x minutes of inactivity, monitor goes to lower power usage mode. “low power” OFF: “Standby” Remember: ON, SLEEP, AND OFF
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  9 Current ENERGY STAR Specification •Sets minimum wattage levels in low- power or “sleep” mode. – First Sleep Mode:  15 watts – Second or “Deep Sleep” Mode  8 watts
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  10 Why Revise theCurrent Specification? • Virtually all monitors meet current ENERGY STAR specification. • Large percentage of monitors are not sleep enabled (i.e., we are not getting the energy savings we could be). • Recent NRDC research shows energy use in “on” mode is 80 –90% of total kWh/yr. • For “on” and “off” modes, wide range of performance between similar-sized models. • Broad interest in limiting standby power use.
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  11 Goals for RevisedSpecification • Incorporate all 3 operating modes: – On (active) – Sleep (inactive) – Off (standby) • Performance-based specification. • One specification for all monitors, not one for CRTs, one for LCDs, etc. • Equal or better performance compared to non-ENERGY STAR labeled models.
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  12 The Core Requirements •Maximum allowable power consumption levels for each mode: On, Sleep, Off • Consensus test method for measuring active power usage. • Minimum consumer acceptance criteria (brightness, warranty, etc.) • Product and package labeling.
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  13 Why Active Power? •Feasible without negatively affecting product performance; in fact, some manufacturers are already meeting the proposed specifications • Limited additional energy savings potential in sleep and off modes; ; 90% of savings with proposed spec is from “active” • Not dependent on enabling rates • Allows a variety of technologies (e.g., CRT and LCD) to qualify
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  14 LCDs • Highlight anew technology in the marketplace • Additional benefits: – Space – Heat – Power consumption – Useful life – Installation – Disposal
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  15 On Mode: ActivePower Use • Sets maximum allowable active power (W) Power as a function of mega pixels: W = 30 + 20X Example: monitor has resolution of: 1280 x 1024 = 1,310,720 or 1.31 mega pixels W = 30 + 20 (1.31) = 56 W
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  16 On Mode (cont.) •Technology neutral, agnostic to monitor type (LCD or CRT), size (15”, 17”, etc.). • If monitor yields more information, allow a little more power consumption.
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  17 Sleep Mode • Justone sleep mode level. • Maximum allowable power: 4 W • If multiple sleep modes, all must meet 4W requirement.
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  18 Sleep Mode AdvisoryLanguage • For consideration in updated ENERGY STAR computer specification: Maximum default time: 15 minutes Maximum recovery time: 5 seconds • Goal – increase likelihood that users actually use and are not annoyed by energy management features.
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  19 Off Mode • Synonymouswith standby. • Power consumed when device is plugged in, but switched off:  2 W. • Working to harmonize with US Executive Order for Standby Power Consumption (1 watt executive order)
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  20 Non-energy Reqts. • Mustbe: bright enough, easy-to-read, reliable. • Brightness: minimum luminance of 100 nits (candelas/m2 ). • Contrast: minimum contrast ratio of 200:1. • Defective Pixels:  5 sub-pixel faults per million sub-pixels. • Warranty: at least 2 years. • User Interface: UI Standard recommended
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  21 Labeling Requirements ENERGY STARlogo must be displayed on: • top/front of product, • product package, • product literature.
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  22 Time Line forRevision of Computer Monitor Specification April 2002 May 2002 June 2002 July 2002 August 2002 Sept. 2002 Oct. 2002 Nov. 2002 Dec. 2002 Jan. 2003 EPA to distribute first draft of specification to industry and other stakeholders  18 EPA to meet with industry in San Francisco to discuss first draft of specification  29 EPA to work with Test Method Development Committee to refine test method 20 24 EPA to work with interested manufacturers on non-energy aspects of specification 20 15 EPA to work with ITI and interested manufacturers on product labeling ideas and other aspects of Partnership Agreement 20 15 Prior to EU meeting, EPA to update the draft specification per feedback received to date  20-24 EPA to meet with EU representatives in Nice, France to present and discuss draft monitor specification  27-31 EU to send comments to EPA and EPA to review them 01 15 Industry to meter current models based on refined test method 25 15 Final day for industry to submit test data to EPA  15 EPA to analyze data and prepare draft two of the specification 16 04 EPA to confer with TCO during the preparation of draft two 16 04 EPA to distribute second draft of specification to industry and other stakeholders  05
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  23 Industry and EUto send comments to EPA and EPA to review them 06 09 EPA to prepare final specification 10 29 EPA to distribute final specification to industry and other stakeholders  30 EPA to work with industry to identify potential venues to announce/promote new specification. Prepare announcement, etc. 01 Interested manufacturers sign Partnership Agreement 01 Tentative effective date of specification  01 Time Line for Revision of Computer Monitor Specification (cont’d.)
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  24 What did themonitor industry think about our draft specification?
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  25 Key Industry FeedbackRegarding Draft Specification • Industry expressed few concerns on having the new specification include requirements for all three operating modes: on, sleep, and off. • With few exceptions, industry agreed to a pixel per watt approach for on mode • EPA and industry agreed to define a common test method for measuring on mode power consumption. Manufacturers to test and submit data once test method is finalized
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  26 Key Industry FeedbackRegarding Draft Specification (cont’d) • Should ENERGY STAR set one specification (one line) that covers all CRT and LCD monitors, or should the specification differentiate between CRTs and LCDs (2 lines) ? • Specification too stringent for CRTs, particularly for the desktop publishing environment (e.g., large screen sizes) • Wake-up time for monitor. Industry wants more guidance on how to measure/define wake-up time
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  27 Key Industry FeedbackRegarding Draft Specification (cont’d) • Industry supports a single sleep mode specification, as opposed to the current sleep and deep sleep design • 4-watt sleep mode specification is agreeable • off mode of 2 watts may be difficult for LCDs
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  28 Key Industry FeedbackRegarding Draft Specification (cont’d) • Several manufacturers questioned non-energy requirements • Specific concerns include: – Brightness level will be harder to meet for larger CRT monitors. – EPA should reference ISO standards for contrast ratio; CRTs and LCDs are measured differently. – Pixel faults only applies to LCD monitors. – Warranties could be a serious challenge with retailers, and may not work in international markets.
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  29 Next Steps...
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  30 Key Next Stepsfor EPA and Industry • Establish test procedure • Industry to submit input to EPA on non-energy parameters • Manufacturers to test monitors according to new test procedure and submit data to EPA. • EPA to analyze new data and revise specifications, as necessary.
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  31 Changes to specificationbased on Industry Response • May need to allow more CRTs to qualify • large screen CRTs issue • Scale down non-energy attributes • Monitor wake-up time ? • Test procedure
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  32 Questions ? Comments ?
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  33 • Were theirquestions or comments on the first draft? – Test procedure, non-energy attributes, etc.... • Like to submit next draft to you first provided we receive comments in timely fashion (3 weeks) • Can you provide data from European manufacturers? Questions for You...
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  34 Sleep, Off, OnMode and non-energy attributes The Specifics
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  35 Sleep Mode Current ENERGYSTAR Specification: • First Sleep:  15 W; Second Sleep:  8W Proposed Specification: • Just one level :  4 W; simplifies spec • Under the new spec, sleep mode power is about 10% of active mode power • Roughly two-thirds of existing models can meet the proposed sleep requirement.
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  36 Sleep Mode Questions Verifyconsensus: • Only 1 tier (no deep sleep)? • Maximum power level : 4 W? • Advisory levels set at right levels? -Default time till sleep: < 15 minutes -Recovery time: < 5 seconds
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  37 Off Mode • Currentspecification: no standby power limit. • Current measured levels: some as high as 8-9 W, several at 4-5 W. • Proposed specification:  2 W. • Lots of models currently meet the 2W limit.
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  38 “Off” Mode Questions •Verify Consensus: – Is 2W the right level? – Beneficial to have same level set in Executive Order (not simply 1W)? – Suggestions on how to harmonize with European Union. (TCO)
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  39 On (Active) ModeDiscussion
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  40 What Does TheTerm “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
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  Estimated Annual EnergyUse for CRTs and LCDs
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  42 The Advantages ofPixels/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
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  Effect of Resolutionand Monitor Type on Active Power Consumption
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  Effect of Resolutionand Monitor Type on Active Power Consumption for Monitors 17” and Less
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  Effect of Resolutionand Monitor Type on Active Power Consumption for Monitors Greater than 17”
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  46 Effect of Resolutionand Monitor Size on Active Power Consumption for LCD Monitors 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 0.00 250000.00 500000.00 750000.00 1000000.00 1250000.00 1500000.00 1750000.00 2000000.00 2250000.00 2500000.00 2750000.00 3000000.00 Millions of Pixels (horizontal X vertical resolution) Watts in Active Mode < 16" 16-17" 18-20" > 20" Proposed Specification
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  47 Effect of Resolutionand Monitor Size on Active Power Consumption for CRT Monitors 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 0.00 250000.00 500000.00 750000.00 1000000.00 1250000.00 1500000.00 1750000.00 2000000.00 2250000.00 2500000.00 2750000.00 3000000.00 Millions of Pixels (horizontal X vertical resolution) Watts in Active Mode < 16" 16-17" 18-20" > 20" Proposed Specification
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  48 Applying Active PowerSpec to Standard Resolutions 93 watts 3,145,728 2048 x 1536 82 watts 2,592,000 1800 x 1440 69 watts 1,920,000 UXGA 1600 x 1200 57 watts 1,310,720 SXGA 1280 x 1024 46 watts 786,432 XGA 1024 x 768 40 watts 480,000 SVGA 800 x 600 37 watts 307,200 VGA 640 x 480 Maximum Power Use Total Pixels Category Resolution
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  49 Need for ConsistentMeasurement • 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.
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  50 0 20 40 60 80 100 120 140 160 Resolution Refresh RateBrightness Contrast # of Colors Image Displayed Extremes Setting Watts High Low Average Effects of User Settings on Power for a 21” CRT Monitor
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  51 0 5 10 15 20 25 30 35 40 Resolution Refresh RateBrightness Contrast # of Colors Image Displayed Extremes Setting Watts High Low Average Effects of User Settings on Power for a 17” LCD Monitor
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  52 Non-Energy Aspects ofthe Specification
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  53 Why Include Non-EnergyAttributes? • Goal is to ensure a level playing field – maintain or enhance quality while saving energy • What aspects of product quality or performance could be compromised if a manufacturer looked for a “quick fix” to meet the new ENERGY STAR spec? • ENERGY STAR and the utilities that support it want to ensure that customers will have a satisfying experience with labeled products. • Reliability -- Saving energy is the product of power savings and time (kwh = w*h). An energy efficient product that fails early won’t save much energy.
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  54
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  55 Key Non-Energy SpecProvisions • Brightness – Minimum of 100 nits at default brightness and contrast settings – LCDs typically 150 to 250 nits – CRTs typically 80 to 120 nits • Contrast ratio – Minimum of 200:1 (can adjust settings to achieve this level) – LCDs typically 200:1 to 400:1 – CRTs typically >400:1 • Without these specs, very dim or low contrast screens could more easily meet ENERGY STAR but may not satisfy users
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  56 Other Key Attributes •Refresh rate – Minimum of 85 Hz for CRTs and 60 Hz for LCDs – attempt to preserve ergonomic quality • Pixel faults – No more than 5 sub-pixel faults per million sub-pixels (Class II, ISO 13406-2) – seek to minimize quality differences between CRT & LCD • Warranty – At least 2 years - 3 years common from many major manufacturers, but spec recognizes retailer preference for selling extended warranties
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  57 Other Possible Non-Energy Attributes •Viewing angle – How far from the horizontal and vertical axes of the screen can it still be clearly seen? • Wake from sleep time – How long before information is legible on screen after wakeup? Is there a consensus way to measure that? • Pixel density – pixels per inch (PPI) • Resolution/Addressability Ratio (RAR) – VESA Section 6.6 – ability of a screen to resolve individual lines or pixels • Others?
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  58 Test Method Discussion
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  59 Elements of aStandard Test Procedure • Identical on-screen image (alternating black and white lines 1 pixel in height?) filling full viewable area of screen • Default brightness and contrast settings (balance between simplicity and risk of manipulation) • Highest VESA supported resolution with a refresh rate of at least 85 Hz for CRTs, native resolution and 60 Hz refresh rate for LCDs – is other timing language needed?
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  60 Other Test ProcedureElements • Reference VESA specifications for power measurement – true RMS power at 3 combinations of voltage and frequency, averaged across at least 5 test samples – 100 VAC, 50 Hz; 117 VAC, 60 Hz; 230 VAC, 50 Hz • Leave off or disconnect any included peripheral features – TV tuner, microphone, speakers, USB hubs, etc. • Others?
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  61 Standardized Labeling Informationon the Box 48,000 pixels/watt 1600 x 1200 pixels 2 watts 4 watts 40 watts Energy Efficiency Resolution Energy Efficiency measures how much information can be displayed per watt of power used. Higher numbers are better. Off Power Use Sleep Power Use Active Power Use
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  62 ENERGY STAR Office Equipmentspecification revisions… What does the future hold?
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  63 Future Specification Revisions •Other Office Equipment • Laptops (initiate research March 2002) • Scanners, printers, copiers, MFDs, fax machines – (Scanner USB issue; initiate research Sept. 2002) • computer (initiate research mid-2003) • Vision • EU-EPA collaboration • sleep, active power and standby power • energy efficient power supplies • USB driven products • universal imaging specification