The GB21520-2023 "Limits and Grades of Energy Efficiency for Displays" released on May 23, 2023, will come into effect on June 1, 2024 and replace the GB21520-2015 (the old standard). At the same time, the China Quality Certification Center (abbreviated as CQC) has revised the certification rules related to this standard, namely CQC31-452629-2016 "Energy Efficiency Certification Rules for Computer Displays", covering sub-class number 701008.

　　The main changes to the GB21520-2023 regulation are as follows:

　　1) The product name and application scope have been modified. The product name has been changed from "computer monitor" to "monitor". In terms of display method, organic light-emitting diode (OLED) monitors and light-emitting diode (LED) integrated display terminals have been added; in terms of power supply method, DC-powered monitors have been added; in terms of product application, commercial monitors have been added.

　　2) The normative reference documents SJ/T 11141, SJ/T 11281, IEC 62087-2:2015, and ITU-R BT.2100 have been added.

　　3) Added "LED integrated display terminal", "working status", "working status power"; Changed the terms and definitions of "off state", "sleep state", "energy efficiency"; Deleted the terms and definitions of "energy-saving evaluation value", "high-performance display" and "standard display".

　　4) Computer monitor energy efficiency grades: The requirements for energy efficiency at various levels for LCD monitors have been revised. Requirements for energy efficiency have been added for OLED monitors and LED integrated display terminals. Criteria for determining energy efficiency for high-performance LCD monitors, high-performance OLED monitors, and high-performance LED all-in-one machines have been increased. This requires additional differential testing. In principle, at least one sample from the same application unit should be sent for energy efficiency testing.

　　5), The energy efficiency limits for displays have been increased, including the energy efficiency limits for OLED displays and LED integrated display terminals.

　　6) The power limit values for the display's sleep state and off state have been revised. The sleep state power test results and off state power test results in the original report should be verified in accordance with the new standard 5.3/5.4. If necessary, additional tests should be conducted.

　　7), Appendix A: The test method for display energy efficiency has been revised. In principle, at least one sample of the same application unit should be sent for energy efficiency testing. If necessary, additional tests for sleep state power and off state power should also be conducted. Appendix B/C: The criteria for determining high-performance displays have been changed. The test method for display performance of high-performance LCD displays in Appendix B has been modified, and the test methods for display performance of high-performance OLED displays have been added; the test method for display performance of high-performance LED all-in-one machines in Appendix C has also been added. This requires additional difference tests. In principle, at least one sample of the same application unit should be sent for the tests in Appendix B such as horizontal viewing angle, inherent resolution, NTSC color gamut coverage, refresh rate and HDR peak brightness, and the high-performance display status should be re-determined.

　　8) The list information of key components of the display has been revised.