TV Energy Consumption Trends and Energy-Efficiency Improvement Options

Park, Won Young; Phadke, Amol; Shah, Nihar; Letschert, Virginie

doi:10.2172/1026814

Cited by 29 publications

(49 citation statements)

References 12 publications

(3 reference statements)

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“…This estimation is mainly based on combining the results in [19] (which provides a detailed estimation of TV electricity use in the USA) and [40] (which estimates the worldwide TV electricity consumption based on present and future TV energy-efficiency levels, but doesn't seem to take into account the electricity consumption of legacy TVs).…”

Section: Power Consumption Of the Remaining Ict Equipmentmentioning

confidence: 99%

Trends in worldwide ICT electricity consumption from 2007 to 2012

Heddeghem

Lambert

Lannoo

et al. 2014

Computer Communications

424

206

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Information and Communication Technology (ICT) devices and services are becoming more and more widespread in all aspects of human life. Following an increased worldwide focus on the environmental impacts of energy consumption in general, there is also a growing attention to the electricity consumption associated with ICT equipment.In this paper we assess how ICT electricity consumption in the use phase has evolved from 2007 to 2012 based on three main ICT categories: communication networks, personal computers, and data centers. We provide a detailed description of how we calculate the electricity use and evolution in these three categories.Our estimates show that the yearly growth of all three individual ICT categories (10%, 5%, and 4% respectively) is higher than the growth of worldwide electricity consumption in the same time frame (3%). The relative share of this subset of ICT products and services in the total worldwide electricity consumption has increased from about 3.9% in 2007 to 4.6% in 2012. We find that the absolute electricity consumption of each of the three categories is still roughly equal. This highlights the need for energy-efficiency research across all these domains, rather than focusing on a single one.

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Section: Power Consumption Of the Remaining Ict Equipmentmentioning

confidence: 99%

Trends in worldwide ICT electricity consumption from 2007 to 2012

Heddeghem

Lambert

Lannoo

et al. 2014

Computer Communications

424

206

View full text Add to dashboard Cite

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“…8 An existing 3D display in 3D mode requires additional 3D image processing and results in a relatively lower brightness level due to additional films or 3D glasses in comparison to 2D mode. Therefore, manufacturers may increase brightness level and correspondingly increasing power consumption in 3D mode in comparison to 2D mode (Park et al 2011). Manufacturers are overcoming this increase in energy consumption by improving screen technologies, including 3D technologies.…”

Section: Emerging Trendsmentioning

confidence: 99%

“…3 Global PC monitor shipment distribution by screen size (actual shipment: Q1 2010-Q2 2011, forecast: Q3 2011-Q4 2015) luminance delivered out of the LCD is generally less than 10 % of the initial luminance coming out of the backlight unit. This is because two crossed polarizers, a color filter, and TFT arrays in the LCD panel absorb a significant amount of light from the backlight unit (Shieh et al 2009;Park et al 2011). The required backlight luminance is therefore highly sensitive to the panel transmittance and optical film efficiency, making even small improvements in these yielding large payoffs in terms of required luminance and therefore overall efficiency.…”

Section: Efficiency Improvement Options and Related Trends For Pc Monmentioning

confidence: 99%

“…Material cost reduction is an intrinsic motivation for manufacturers to achieve high efficiency in their LED backlights. The luminous efficacy of LEDs available for use in LCD monitors is 70-90 lm/W in 2011-2012, and expected to go beyond 100 lm/W in 2013 (DisplaySearch 2011b; Park et al 2011;US DOE 2011). Driven by this efficiency improvement, the average number of LED lamps used for a 23-in.…”

Section: Backlight Sourcesmentioning

confidence: 99%

“…For example, lowvoltage-driven LC materials would allow manufacturers to use narrower low-resistance data lines, resulting in high cell aperture ratio and therefore higher LC panel transmittance than can currently be used. It is expected that LCD panel transmittance for IPS and VA structures will improve from 4-6 % to levels of 6-10 % in 2015, compared to levels of 5-6.5 % in 2010 (DisplaySearch 2011b; Park et al 2011). …”

Section: High Panel Transmittancementioning

confidence: 99%

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Efficiency improvement opportunities for personal computer monitors: implications for market transformation programs

2013

Self Cite

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Displays account for a significant portion of electricity consumed in personal computer (PC) use, and global PC monitor shipments are expected to continue to increase. We assess the market trends in the energy efficiency of PC monitors that are likely to occur without any additional policy intervention and estimate that PC monitor efficiency will likely improve by over 40 % by 2015 with saving potential of 4.5 TWh per year in 2015, compared to today's technology. We discuss various energyefficiency improvement options and evaluate the cost-effectiveness of three of them, at least one of which improves efficiency by at least 20 % cost effectively beyond the ongoing market trends. We assess the potential for further improving efficiency taking into account the recent development of universal serial bus-powered liquid crystal display monitors and find that the current technology available and deployed in them has the potential to deeply and cost effectively reduce energy consumption by as much as 50 %. We provide insights for policies and programs that can be used to accelerate the adoption of efficient technologies to further capture global energy saving potential from PC monitors which we estimate to be 9.2 TWh per year in 2015.

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42.2: Invited Paper: Ambient Light Levels During Television Viewing

Sills

Papamichael

Graeber

et al. 2014

Symp Digest of Tech Papers

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The results of the CLTC study show the television light sensor measured illuminance levels from less than 1 lux to more than 300 lux (lx). The vast majority of viewing (79.5%) occurred at illuminance levels below 50 lx, while very little viewing (3.6%) occurred at illuminance levels greater than 300 lx. The results of this study indicate that 0 lx illuminance is unnecessary and that other illuminance levels (10, 50, and 100 lx) should be considered for power measurements, to better reflect actual illuminance levels during TV viewing in residential applications. Author KeywordsAutomatic-Brightness-Control (ABC); Ambient Light; EnergyStar; Residential; Energy Savings; Test Procedures; Television Background and ObjectiveTelevision energy consumption has been a growing portion of residential energy use. Globally, televisions account for approximately 168 terawatt hours (TWh) of electricity consumption (Park, Phadke, Shah, & Letschert, 2011). A 2011 study showed that the adoption of more efficient televisions could potentially result in 37.6 TWh of cumulative electricity savings by the year 2020. This includes 7.3 TWh of cumulative potential savings in the United States (Park, Phadke, Shah, & Letschert, 2011).The Environmental Protection Agency (EPA) has managed an Energy Star endorsementlabeling program for televisions since 1998. In 2010 the U.S. Department Of Energy (DOE) appliance standards program initiated efforts to develop a range of policies aimed at reducing television energy consumption.Energy efficiency standards require test procedures that describe how to measure energy consumption. It is important that measurements be done under typical operating conditions that are repeatable, reproducible and accurate. To support the development of federal efficiency standards for televisions, the Collaborative Labeling and Appliance Standards Program (CLASP) launched a study in 2010 to assess the energy performance of televisions and the Energy Star test procedure for energy consumption measurements (Jones 2011). This study addressed several issues related to television energy performance, including the Energy Star procedures for measuring energy use for televisions that use automatic brightness control (ABC) based on ambient light levels. The ABC feature adjusts the brightness of the television screen based on ambient light levels, aiming at reducing brightness at low ambient levels to reduce television energy consumption. Energy Star test procedure required energy measurements at ambient levels of 0 and 300 lx illuminance on the television screen.The 2011 study included television energy consumption measurements of 39 televisions, following Energy Star test procedure at 10, 50, 100, 150, 200, 250, and 300 lx to determine energy consumption changes with the ABC feature enabled. The results showed that only 10 of the 39 televisions reduced power consumption as the ambient light level was lowered.The study found that the Energy Star Version 5 testing procedure, which calculates energy consumption as an average of cons...

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TV Energy Consumption Trends and Energy-Efficiency Improvement Options

Cited by 29 publications

References 12 publications

Trends in worldwide ICT electricity consumption from 2007 to 2012

Trends in worldwide ICT electricity consumption from 2007 to 2012

Efficiency improvement opportunities for personal computer monitors: implications for market transformation programs

42.2: Invited Paper: Ambient Light Levels During Television Viewing

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