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GB 21520-2023: Minimum allowable values of energy efficiency and energy efficiency grades for displays
GB 21520-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.010
CCS F 01
Replacing GB 21520-2015
Minimum allowable values of energy efficiency and energy
efficiency grades for displays
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: JUNE 1, 2024
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Abbreviations ... 7
5 Technical requirements ... 8
6 Calculation method of energy efficiency and power ... 10
7 Test methods ... 11
Appendix A (Normative) Test methods for the energy efficiency of displays, and the
power of sleep mode and the power of off mode of LCD and OLED displays ... 12
Appendix B (Normative) Test method for display performance of high-performance
LCD and high-performance OLED displays ... 20
Appendix C (Normative) Test method for display performance of high-performance
LED panel-controller integrated display terminals ... 25
Minimum allowable values of energy efficiency and energy
efficiency grades for displays
1 Scope
This document specifies the minimum allowable values of energy efficiency and energy
efficiency grades for displays, and energy efficiency calculation and test methods.
This document is applicable to flat and curved general-purpose and commercial
displays with a screen diagonal size of not less than 40 cm, powered by AC or DC, and
using liquid crystal (LCD) and organic light-emitting diode (OLED) as display methods.
This document is applicable to LED panel-controller integrated display terminals
powered by AC or DC, with light-emitting diodes (LED) as the display mode, pixel
pitch greater than 0.30 mm and not greater than 2.60 mm, and maximum luminance not
greater than 3000 cd/m2.
This document does not apply to:
a) Professional-purpose monitors for image evaluation during the shooting,
production, and broadcasting of TV programs;
b) Dual screen displays;
c) Displays used for industrial equipment, medical equipment, movie projection,
virtual reality (VR), augmented reality (AR), merged reality (MR), extended
reality (XR), LCD console (KVM/KMM), and other professional uses, and
display products used only as accessories;
d) Displays that are only powered by battery.
2 Normative references
The following documents contain the provisions which, through normative reference in
this document, constitute the essential provisions of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB/T 8170 Rules of rounding off for numerical values and expression and judgment
of limiting values
GB 20943 Minimum allowable values of energy efficiency and evaluating values
of energy conservation for single voltage external AC-DC and AC-AC power
supplies
SJ/T 11141 Generic specification for LED displays
SJ/T 11281 Measure methods of light emitting diode (LED) displays
IEC 62087-2:2015 Audio, video, and related equipment - Determination of power
consumption - Part 2: Signals and media
ITU-R BT.2100 Image parameter values for high dynamic range television for use
in production and international program exchange
3 Terms and definitions
The terms and definitions defined in SJ/T 11141 and the following apply to this
document.
3.1 LED panel-controller integrated display terminal
A standardized LED display device that has a variety of standard input and output
interfaces, displays information such as text, images, and videos with LED pixels, has
a built-in display control system and image processing unit, and can provide services
including but not limited to playback, information release, power management, human-
computer interaction, wireless projection, and other functions.
3.2 on mode
The state in which the display is connected to the power supply and displays
information such as video, images, and text.
3.3 off mode
The state in which the display is connected to the power supply, does not display video,
image, and text information, and cannot enter other states through the remote-control
unit, internal signals, or external signals.
3.4 sleep mode
A low-power state in which the display can provide one or more functions without being
turned off.
NOTE 1: There may be multiple sleep modes.
NOTE 2: The functions that the display can provide in sleep mode include but are not limited to:
Appendix A
(Normative)
Test methods for the energy efficiency of displays, and the power of sleep
mode and the power of off mode of LCD and OLED displays
A.1 Test conditions
A.1.1 Environmental conditions
The test shall be carried out under conditions of temperature, humidity, and air pressure
within the following ranges:
a) Temperature: 23 ℃±5 ℃;
b) Relative humidity: 45%~75%;
c) Atmospheric pressure: 86 kPa~106 kPa.
A.1.2 Power supply
A.1.2.1 The power supply mode and electrical parameters of the display shall be
specified by the manufacturer.
A.1.2.2 In the case of AC power supply, the power supply voltage, power frequency,
and total harmonic distortion shall meet the following requirements:
a) Power supply voltage: AC 220×(1±1%)V or 380×(1±1%)V;
b) Power frequency: 50×(1±1%)Hz;
c) Total harmonic distortion: ≤2%.
A.1.2.3 In the case of DC power supply, the fluctuation of the power supply voltage
shall not exceed ±5% of the value specified by the manufacturer.
A.2 Test instruments
A.2.1 Luminance colorimeter
When used for testing LCD displays and OLED displays, the measuring range of the
luminance colorimeter shall be at least 0.02 cd/m2~2000 cd/m2, and the luminance
resolution shall be at least 0.01 cd/m2.
When used for testing the LED panel-controller integrated display terminal, the
measuring range of the luminance colorimeter shall at least be 0.02 cd/m2~10000 cd/m2,
and the luminance resolution shall be at least 0.01 cd/m2.
A.2.2 Power meter
The power meter is an active power meter with a crest factor greater than or equal to 3
and a minimum current range of less than or equal to 10 mA. When measured power is
less than or equal to 1 W, the reading shall be accurate to 0.001 W.
A.2.3 Test signal generating equipment
The test signal generating equipment shall have the following characteristics:
a) At least it shall have test output interfaces such as HDMI, DP, USB, DVI, and
VGA;
b) It can generate image test signals consistent with the inherent resolution of the
display under test;
c) The frame rate can be adjusted, supporting at least 120 Hz or more.
NOTE 1: The format of the test signal is related to the interface version. It is recommended to use test
signal generating equipment with a certificate of reference material.
NOTE 2: The test signal generating equipment only supports the provision of signals, and cannot
consume the power consumption of the display.
NOTE 3: The test unit selects the test signal generating equipment with the corresponding test interface
according to the situation of its own test products.
A.3 Test method
A.3.1 Test interface
If the display has more than one video input interface, the energy efficiency is tested in
the first order available as follows, and only tested once:
a) HDMI;
b) DP;
c) DVI;
d) USB...