DB35T1753-2018 PDF in English
DB35T1753-2018 PDF English
Standards related to (historical): DB35T1753-2018
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DB35T1753-2018: PDF in English DB35/T 1753-2018
DB35
LOCAL STANDARD OF FUJIAN PROVINCE
ICS 31.120
L 63
The Energy Efficiency Grades of LED Display Module
LED显示模组能效等级
ISSUED ON. APRIL 3, 2018
IMPLEMENTED ON. JULY 3, 2018
Issued by. Fujian Province Bureau of Quality and Technical Supervision
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Technical Requirements... 6
4.1 Energy efficiency... 6
4.2 Power density for sleep mode... 6
4.3 Evaluation of energy conservation of LED display module... 6
5 Calculation Method... 7
5.1 Specification factors of LED display modules' LEDs... 7
5.2 Calculation of power value per unit time... 7
5.3 Calculation of energy efficiency... 8
5.4 Calculation of power density for sleep mode... 8
6 Test Method... 8
6.1 Test conditions... 8
6.2 Test instrument... 9
6.3 Test method... 9
7 Inspection Rules... 10
7.1 Inspection classification... 10
7.2 Exit-factory inspection... 11
7.3 Type test... 11
The Energy Efficiency Grades of LED Display Module
1 Scope
This Standard specifies the energy efficiency grade, test method and result judgment of LED
display module.
This Standard applies to indoor and outdoor full-color LED display modules that operate
normally under grid voltage.
This Standard does not apply to LCD displays using LED backlights or curved LED display
module.
2 Normative References
The following documents are essential to the application of this Document. For the dated
documents, only the versions with the dates indicated are applicable to this Document; for the
undated documents, only the latest version (including all the amendments) is applicable to this
Document.
SJ/T 11141-2012 General specification for LED panels
SJ/T 11281 Test methods of LED panels
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in SJ/T 11141 and the
following apply.
3.1 LED black light
LED component that is encapsulated in black material.
3.2 Pixel pitch
The center distance between two adjacent pixels.
3.3 White filed mode
The LED display module is connected to the power supply and displays completely white. The
LED display module is at the highest grayscale level and the highest brightness level.
NOTE. The white field color coordinates shall comply with the provisions of Table 8 in SJ/T 11141-2017.
3.4 Black filed mode
The LED display module is connected to a power supply and displays completely black. The
LED display module is at the lowest grayscale level and the lowest brightness level.
3.5 Energy efficiency; Eff
Under the measurement conditions specified in this Standard, the ratio of the luminous intensity
of the LED display module screen to the actual input power of the LED display module (also
known as working efficiency).
NOTE. The unit of energy efficiency is candela per watt (cd/W).
3.6 Sleep mode
The LED display module is in a state of low energy consumption without turning off the power.
NOTE. This state can be entered by user selection or automatically after a period of time without signal
input.
3.7 Power density for sleep mode; E
The energy consumption per unit area of the LED display module in the sleep mode.
NOTE. The power density for sleep mode is expressed in watts per square meter (W/m2).
3.8 Evaluating values of energy conservation
Under the measurement methods specified in this Standard, the minimum energy efficiency and
maximum power density for sleep mode allowed for energy-saving LED display modules.
3.9 Small pitch LED displays
LED indoor (outdoor) display screens with a pitch of no more than 2.5 mm (4.0 mm) are
collectively referred to as indoor (outdoor) small pitch display screens.
3.10 Specification factor; n
The influence coefficient of the lamp bead specifications on the brightness and power of the
LED display module per unit area.
--- ambient temperature. 15 ℃ ~ 35 ℃;
--- Ambient humidity. 25% ~ 75%;
--- Atmospheric pressure. 86 kPa ~ 106 kPa.
Tested at rated voltage and rated frequency.
6.2 Test instrument
The test shall use calibrated power meter, brightness meter and steel ruler.
The power meter has a resolution of 0.01 W, when measuring active power no greater than 10
W; has a resolution of 0.1 W, when measuring active power greater than 10 W and less than
100 W; and has a resolution of 1 W, when measuring active power greater than or equal to 100
W.
The brightness meter error shall be no greater than 5%.
The steel ruler graduation value is 1 mm.
The test loop in the energy loss test shall be as short as possible to avoid measurement errors
caused by the test circuit.
6.3 Test method
6.3.1 Test setup
6.3.1.1 Brightness measurement conditions
Under a certain ambient illumination, the LED display module changes less than ±10%; and
the brightness meter acquisition range shall be no less than 16 adjacent pixels.
6.3.1.2 Brightness uniformity
The brightness non-uniformity of the LED display module shall not exceed 10%, and the test
method shall be in accordance with SJ/T 11281.
6.3.2 Brightness test
The brightness test shall follow the following procedures.
a) After the LED display module is adjusted to the white field mode for 30 min, the
brightness test shall be carried out;
b) The display module is measured with a brightness meter; and the white field brightness
is measured using the 9-point method; and the arithmetic mean of the brightness of the 9
points is taken as the maximum brightness LW;
c) The display module is adjusted to the black field mode; and the display module is
measured with a brightness meter; and the black field brightness is measured using the
9-point method; and the arithmetic mean of the brightness of the 9 points is taken as the
background brightness LD; and the average brightness, L, of the LED display module is
calculated according to Formula (5).
6.3.3 Energy loss test
The energy loss test shall follow the following procedures.
a) After the LED display module is adjusted to the white field mode for 30 min, the
maximum energy loss, Et, of the display module in the white field mode is measured with
a power meter. The measurement cycle shall be no less than 10 min;
b) Adjust the LED display module to the sleep mode for at least 30 min, and measure the
sleep mode energy loss, Ets, of the display module with a power meter. The test cycle
shall be no less than 10 min;
c) Calculate the power value per unit time according to the provisions of 5.2.
NOTE. If the product does not have a sleep mode, adjust the LED display module to enter the black field
mode.
6.3.4 Calculation
The calculation method of LED display module energy efficiency.
a) Use a steel ruler to measure the height and width of the display area of the LED display
module; and calculate the display area, S, of the display module according to the product
of the two;
b) Calculate the energy efficiency according to the provisions of 5.3;
c) Calculate the power density for the sleep mode according to the provisions of 5.4.
7 Inspection Rules
7.1 Inspection classification
Inspection is divided into exit-factory inspection and type test.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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