Introduction to GB 21520-2023 "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Displays"
I. Background and Timeline of the New Standard Release
On May 23, 2023, GB 21520-2023 "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Displays" was officially released. This standard will be implemented on June 1, 2024, replacing the older GB 21520-2015 standard. This update aims to adapt to technological development and increased environmental awareness, placing higher requirements on the energy-saving performance of displays such as LED screens.
II. Main Changes in the New Standard
Product Name and Scope of Application Adjustment
The product name has been changed from "computer monitor" to "display," and the scope of application has been expanded to include organic light-emitting diode (OLED) displays and integrated light-emitting diode (LED) display terminals, as well as DC-powered displays and commercial displays.
Increased Normative References
New normative references have been added, including SJ/T 11141, SJ/T 11281, IEC 62087-2:2015, and ITU-R BT.2100, providing more comprehensive technical support for the implementation of the standard.
Updated Terminology and Definitions
Terms and definitions have been added, including "LED integrated display terminal," "operating state," and "operating state power."
Definitions for terms such as "off state," "sleep state," and "energy efficiency" have been revised.
Terms such as "energy-saving evaluation value," "high-performance display," and "standard display" have been deleted.
Changes in Testing Requirements
Energy efficiency requirements for various levels of LCD displays have been revised, and energy efficiency requirements for various levels of OLED displays and LED integrated display terminals have been added.
Judgment requirements for high-performance LCD displays, high-performance OLED displays, and high-performance LED integrated displays have been added.
Power limits for sleep state have been revised, and energy efficiency limits for OLED displays and LED integrated display terminals have been added.
Test Method Improvements
The requirements for power supply voltage and total harmonic distortion (THD) accuracy under AC power conditions have been increased, and power supply voltage requirements under DC power conditions have been added.
The accuracy and measurement range of the luminance meter and power meter have been improved, and requirements for the test signal generation equipment have been added.
Requirements for the test interface test sequence, test signal requirements, and DC power supply test system have been added.
Specific setup requirements for displays with batteries, built-in speakers, or built-in computers have been clarified, and the preheating signal and the measurement distance between the luminance meter and the display have been modified.
Related test requirements for OLED displays and integrated LED display terminals have been added.
III. Scope of Application of the New Standard
GB 21520-2023 applies to the following products:
Planetary 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 display (LCD) or organic light-emitting diode (OLED) displays;
LED integrated display terminals (LED all-in-one machines) powered by AC or DC, using light-emitting diodes (LEDs) as the display method, with a pixel pitch greater than 0.30 mm and not greater than 2.60 mm, and a maximum brightness not greater than 3000 cd/m².
This standard does not apply to the following products:
Professional monitors used for image evaluation in television program shooting, production, and broadcasting;
Dual-screen displays;
Professional-purpose displays for industrial equipment, medical equipment, cinema projection, virtual reality (VR), augmented reality (AR), merged reality (MR), extended reality (XR), and LCD control consoles (KVM/KMM), and display products used only as accessories;
Battery-powered displays are supported only.
IV. Benefits of Obtaining New National Standard Energy Efficiency Certification
Improved Energy Efficiency: Energy efficiency certification encourages companies to continuously improve product design, material selection, and production processes, thereby enhancing product energy efficiency.
Reduced Energy Consumption: LED displays that have passed energy efficiency certification have their energy efficiency recognized, effectively reducing energy consumption and carbon emissions.
Reduced Environmental Pollution: Energy efficiency certification encourages companies to produce more environmentally friendly products, reducing pollution and damage to the environment.
Enhanced Product Competitiveness: LED display manufacturers that obtain the new national standard energy efficiency certification can be included in the government procurement list, improving product competitiveness and giving them an advantage when participating in government bidding projects.
Protecting Consumer Rights: Energy efficiency certification protects the legitimate rights and interests of consumers with energy-saving requirements, allowing them to obtain high-quality products that meet the requirements.
In conclusion, the implementation of the GB21520-2023 standard, "Minimum Allowable Values of Energy Efficiency and Energy Efficiency Grades for Displays," will place higher demands on the energy efficiency performance of displays such as LED displays, promoting the green development of the industry.
