Summary and Response to Stakeholder Comments
ENERGY STAR Program Test Method for Displays Version 6.0 Draft Final (Rev. Jun-2012)

I.

TEST SETUP
Comment #Topic

CommentResponse

A stakeholder commented that a display may have different
kinds of peripheral and network connections.

In section 6.2 of Version 6.0 Test Method for Displays Final Draft (Rev.
June-2012), DOE specified that if the unit under test (UUT) has bothdata and network capabilities the UUT shall be configured andconnected to a single active data source or a single network source,
while maintaining a video signal connection. However the intent of thissection is to configure and connect the UUT to one data source(bridging) and to one network source (networking). DOE has modified
this section in the Final Test Method (Sep-2012).

Case1: The UUT has a Display Port and a USB port
The stakeholder’s concern is whether the DisplayPort on theUUT shall be connected, in addition to loading the USB dongle,
or they do not need to connect both these ports while testingfor sleep mode power consumption.
Case2: The display has a Display Port, USB port, Fast Ethernetport and WiFi

1Bridging andNetworking

The stakeholder’s concern is whether the UUT’s DisplayPort,
the USB port, the Ethernet port and the WiFi must beactivated and connected for sleep mode testing or if just asingle data port and a single network port are required forsleep mode testing.

In addition, DOE has added clarifying language in section 5.2 of the Final
Test Method (Sep-2012) for Displays to better define what constitutes abridge (data) connection and what constitutes a network connection. In
the Final Test Method (Sep-2012), DOE specifies that for UUT’s having
bridging capabilities, a bridge connection shall be made between theUUT and the host system. DOE has also provided examples to clarify
what constitutes a bridge connection and what constitutes a network
connection.
Case 1:In the case where a DisplayPort is used as an input signal interface, theFinal Test Method (Sep-2012) requires that the DisplayPort, along with
the USB, shall be connected while testing in sleep mode.
Case2:In the case where the DisplayPort is used as an input signal interface,
the Final Test Method (Sep-2012) requires that the DisplayPort, the WiFi
(if the display is capable of exchanging data over the network without
the connection of an additional client) and USB (if the UUT has bridgingcapabilities) shall be connected while testing in sleep mode. The USB
port shall be connected to the host system so that the UUT and the hostsystem act as two hub controllers.
In the Final Test Method (Sep-2012), the UUT shall not be connected tothe WiFi if the Display is a standalone unit and is not capable ofexchanging data over the network.

August 31, 2012

Page 1 of 5Summary and Response to Stakeholder Comments
ENERGY STAR Program Test Method for Displays Version 6.0 Draft Final (Rev. Jun-2012)
Comment #TopicCommentThe Test Method Section 6.1)A) Testing at Factory Default
Settings requires power measurements be performed with theproduct in its as-shipped condition except as otherwise
specified by the Test Method. Regarding the measurement ofthe On Mode and Sleep Mode power of signage displays, webelieve the data and network capabilities should remain in
their as-shipped condition.

234Bridging andNetworking

Bridging andNetworking

Bridging andNetworking

These signage displays are designed and marketed for
professional applications as opposed to consumer use. The
factory defaults are implemented to match the usage
requirements of the majority of these professional
installations. Consequently, the stakeholder agrees thatsignage displays should be tested in their as-shipped
condition. However, the stakeholder does not recommend
these signage displays be taken out of their default conditionin order to enable data or network capabilities during On
Mode or Sleep Mode power measurements.

Response
DOE understands that professional/signage displays are implemented tomatch the usage requirements of professional applications. However,DOE believes that the use of any network/bridging capabilities in thedisplays require additional configuration by the end user to be enabledregardless of the as-shipped status of the device. For example, a WiFi
connection cannot be simply enabled by default, as the user mustchoose which network to connect to and enter security information
related to the WiFi connection. Thus, the as-shipped configuration ofthese capabilities is not typical of real world usage.
As such, DOE recommends that displays be tested with network andbridging capabilities configured and connected even if these are notactivated as-shipped for the display. DOE has made no changes tosections 6.4 and 6.5 in the Final Test Method (Sep-2012).

As per the test conditions mentioned in section 6.2 C) of the
final draft of the test method, either one of the data ornetwork capabilities should be configured and connectedduring the On Mode and Sleep Mode testing, correct?

See response to comment # 1.

A stakeholder had questions regarding the definition of USB
capabilities of the display. The UUT must have bridging
capability similar to two USB hub controllers, correct? For thepurpose of testing no other peripherals (like mouse, keyboard,external HDD…etc.) are considered as data connections, right?

There shall be no peripheral devices like mouse, keyboard, etc. attachedto the USB port. The simplest way of using a USB bridge connection
would be to connect the USB port of the UUT to the USB port of thehost system; this allows the host machine, along with the UUT, to act as
USB bridged controllers.
Section 5.2 C) of the Final Test Method (Sep-2012) has been updated toclarify that no peripheral devices shall be attached to the USB port
during testing.

August 31, 2012

Page 2 of 5

Summary and Response to Stakeholder Comments
ENERGY STAR Program Test Method for Displays Version 6.0 Draft Final (Rev. Jun-2012)
Comment #Topic

5Bridging and
Networking

6

Bridging and
Networking

7Bridging andNetworking

August 31, 2012

CommentResponse

If the product has network capability, should it be activated nomatter if it’s enabled in default mode or not?

Yes. If the UUT has network capability it shall be activated andconnected to a live network during On Mode and Sleep Mode testing,even if network capability is not activated as the default for the UUT.
While the network capability is activated and connected, there is noactive transfer of data over the network during the test.

As per the final draft test method, if the product has
numerous ports, we could choose either one of the bridging
or network capabilities to proceed with the test rather thanconnecting both of them at the same time. Is that correct?

See response to comment # 1.

A stakeholder had a question on the DisplayPort being usedfor network connectivity. For a display having an Ethernet
connection for the use of monitor control and a DisplayPort
providing DDC/CI function via the aux channel, will theDisplayPort act as a single connection for signal interface anddata capability?

As per the final draft of the test method (Rev. June-2012), the additional
connections beyond the video connection are connected to support
either networking or bridging functionality. These definitions do notinclude just any type of data connection.

Note: The DDC/CI function is used for monitor control.

The DisplayPort in this example does not actually provide network orbridging functionality as defined in the Final Test Method (Sep-2012)and specification. Thus, the DisplayPort connection would only beconnected for the video signal connection, but would not fulfill thenetworking or bridging connection requirement. The Ethernet
connection would need to be made if it supported connection to a livenetwork.

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Summary and Response to Stakeholder Comments
ENERGY STAR Program Test Method for Displays Version 6.0 Draft Final (Rev. Jun-2012)
Comment #8Topic

Light SourceandIlluminance
LevelsAugust 31, 2012

Comment

Response

The direct light method defined by DOE does not reflect
typical overhead lighting in offices and residences. When thedisplay is installed in an office or residence, the angle of theoverhead lighting in relation to the display results in much
lower levels of light detected by the ambient light sensor in
the display. Consequently, the display automatically adjusts
the brightness using sensor data that indicates the room isvery dimly lit, when in fact, the room is well lit from overheadlighting. The end result is that the display luminance is very
dim and the user is forced to override the default luminancesettings. In some cases, users actually return their displays tothe manufacturer under the incorrect assumption that thedisplay is defective.

DOE recognizes that the ABC sensor is likely to respond differently to
direct versus diffuse light. However, substantial testing by DOE
indicates that testing with diffuse lighting or diffuse light set ups may
result in increased test variability. DOE is further investigating therelationship between lux values seen by the unit’s sensor when createdby direct and diffuse test setups, as well as methods to minimize
variability in diffuse light set ups. However, the test approach outlinedin the Final Draft Test Method (Rev. June-2012) is consistent with DOE’s
Test Procedure Notice of Proposed Rulemaking (NOPR) for TVs, and DOE
believes the Displays and TVs test procedures should be harmonized asmuch as possible.

We recommend that the test method be changed to reflect
real world lighting conditions by either changing the angle ofthe lighting to better reflect overhead lighting conditions or by
reducing the illuminance of horizontal lighting to compensate
for the reduced level of lighting that is measured by thedisplay's ambient light sensor in a real-world office orresidence. Ultimately, the display's automatic brightness
control should perform in a similar manner when tested using
the Energy Star test method and when tested in a real-world
300 lux ambient lighting of an office or residence.

However, to address these concerns EPA has removed the requirement
to test and report the On Mode power consumption at 100 lux and 500
lux for products that qualify with ABC enabled by default in the Version
6.0 Final specification. As such, DOE has removed testing of ABC
enabled displays at lighting levels of 100 and 500 lux from the Final TestMethod (Sep-2012). Going forward, DOE and EPA will reevaluate theneed for data at additional illuminance points and will likely reach out toits Partners to gather necessary information to inform the next
specification revision.

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Summary and Response to Stakeholder Comments
ENERGY STAR Program Test Method for Displays Version 6.0 Draft Final (Rev. Jun-2012)
Comment #91011Topic

Light Source
AlignmentCommentThe stakeholder generally supports the clarification details
presented in the Test Method Section 5)G)2) Light Source
Alignment. However, Figures 1 and 2 include a note requiringthat “D1=D2 with respect to vertical reference plane”. We
understand that the dimensions, D1 and D2, are from thefront of the UUT to the rear wall. Many of the test
laboratories implement a dark room for these measurements
using blackout curtains forming “walls” which are not always
square. Panasonic recommends this note either be removed,or relaxed by allowing a reasonable tolerance. A single
measurement from the center of the front of the UUT to therear wall would suffice. We also recommend modifying theD1 and D2 dimensions shown in Figures 1 and 2 in accordancewith our request.

ResponseIn section 5 G) of the Test Method Final Draft (Rev. June-2012) DOE
specifies that the center of the lamp shall be aligned at a horizontal
angle of 0° with respect to the center of the UUT’s automatic brightness
control (ABC) sensor. This specification was based on DOE’s observationthat On Mode power consumed by the UUT varied with a small variationin the horizontal angle of the lamp with respect to the ABC sensor.
In order to maintain this alignment of the UUT’s ABC sensor with thelamp, DOE requires that all four corners of the UUT be an equal distancefrom a vertical reference plane. A single measurement from the centerof the front of the UUT will not assure that the UUT’s ABC sensor ishorizontally aligned with the lamp.
However, DOE understands that black out curtains may be used toimplement a dark room, in which case the curtains may not serve as areference plane. As such, DOE has relaxed the maximum distancecriteria of 2.5 ft specified in the final draft of the test method. Section 4F) of the Final Test Method (Sep-2012) states that “All four corners of
the face of the Unit Under Test shall be equidistant from a verticalreference plane”.

Occupancy
SensorCould you tell us how to measure the power consumption insleep mode with an occupancy sensor? Shall the occupancy
sensor be active during sleep mode measurement? Shall thevideo signal connection be maintained while you measure thesleep mode power consumption with an occupancy sensor?

For UUT’s with the occupancy sensor enabled as-shipped, no person
shall be within close proximity of the occupancy sensor for the durationof the Sleep Mode test. This is to prevent the UUT from entering ahigher power state (e.g. On Mode). DOE has added clarification
language to section 5.2 of the Final Test Method (Sep-2012) specifying
additional testing conditions for products shipped with the occupancy
sensor enabled. The Video signal connection shall be maintained for theduration of the Sleep Mode test period.

Connectivity

Should a monitor with a HDMI connector, having thecapability to support a cable used to charge mobile phones, betested with DVI port present as the signal interface?

Since the UUT supports HDMI connectivity (i.e. to a Blu-ray player),
the HDMI port shall be used for testing all power mode tests asindicated by the Final Draft of the ENERGY STAR Test Method (Rev.
June-2012).

Note: A Blu-ray player can feed signal to the display via theHDMI port.

August 31, 2012

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