DB41T848-2013 PDF in English
DB41T848-2013 PDF English
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DB41T848-2013: PDF in English DB41/T 848-2013
DB41
LOCAL STANDARD OF HENAN PROVINCE
LED light source for micro display projection
ISSUED ON. SEPTEMBER 26, 2013
IMPLEMENTED ON. DECEMBER 26, 2013
Issued by. Quality and Technical Supervision Bureau of Henan Province
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Requirements... 7
5 Test method... 11
6 Inspection rules... 15
7 Marking, packaging, transportation, storage... 16
LED light source for micro display projection
1 Scope
This standard specifies the terms and definitions, requirements, test methods, inspection
rules, marking, packaging, transportation, storage of LED light sources for micro
display projection.
This standard applies to LED light sources for micro display projection (hereinafter
referred to as LED light sources), which is composed of LED light-emitting
components, drive modules, heat dissipation systems.
This standard does not apply to the lighting system of micro display projection,
projection optical system, LED light source for general lighting.
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 standard.
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 2423.1-2008 Environmental testing for electric and electronic products - Part
2.Test methods - Tests A. Cold
GB/T 2423.2-2008 Environmental testing for electric and electronic products - Part
2.Test methods - Tests B. Dry heat
GB/T 2423.3-2006 Environmental testing for electric and electronic products - Part
2.Testing method - Test Cab. Damp heat, steady state
GB/T 2423.10-2008 Environmental testing - Part 2.Test methods - Test Fc.
Vibration (sinusoidal)
GB/T 2829 Sampling procedures and tables for periodic inspection by attributes
(apply to inspection of process stability)
GB/T 2900.65 Electrotechnical terminology - Lighting
GB/T 5465.2 Graphical symbols for use on electrical equipment - Part 2.Graphical
symbols
GB 8898-2011 Audio, video and similar electronic apparatus - Safety requirements
GB 9254 Information technology equipment - Radio disturbance characteristics -
Limits and methods of measurement
GB/T 17618 Information technology equipment - Immunity characteristics - Limits
and methods of measurement
GB 17625.1 Electromagnetic compatibility - Limits - Limits for harmonic current
emissions (equipment input current ≤ 16 A per phase)
GB/T 18313 Acoustics - Measurement of airborne noise emitted by information
technology and telecommunications equipment
SJ/T 11394-2009 Measure methods of semiconductor light emitting diodes
3 Terms and definitions
The terms and definitions as defined in GB/T 2900.65, as well as the following terms
and definitions, apply to this document.
3.1
Micro display projection
Micro display projection (MD Projection) refers to rear projection and front
projection systems based on micro display panel technology (such as DMD (digital
mirror device), LCOS (liquid crystal on silicon), LCD micro display panel
technology).
3.2
LED for micro display projection
The LEDs used for micro display projection are mainly red (R), green (G), blue (B)
three-primary color LEDs. The micro display panel is illuminated by time
modulation (single-chip structure) or spatial modulation (three-chip structure), and
projected onto a screen (rear projection or front projection screen) to obtain a color
image. Different micro display projection systems have different requirements for
LED light sources.
3.3
Effective synthetic white luminous flux
The luminous flux of neutral color temperature synthetic white light as synthesized
by RGB three-primary color LED light sources. The unit is lumen (lm). It is the size
display panel, enter the projection system.
3.8
Luminous brightness of LED light source
The luminous brightness of LED light source refers to the luminous flux of the LED
light source per beam expansion, which is defined as the ratio of the effective
synthetic white light luminous flux to its beam expansion. The unit is lm/mm2 • Sr.
3.9
Luminous efficiency of LED light source
The luminous efficiency of LED light source refers to the ratio -- of the luminous
flux emitted by the LED light source TO the input electrical energy; the unit is lm/W.
Together with the luminous flux, it specifies the power consumption of the LED
light source.
3.10
Lumen maintenance rate
Lumen maintenance rate refers to the ratio -- of the luminous flux output by the LED
light source at a specific moment TO the luminous flux at its initial moment,
expressed as a percentage (%).
3.11
Average lifespan
When a batch of LED light sources work at the same time, and more than 50% of
the light sources still have a lumen maintenance rate of 50%, the cumulative lighting
time of the LED light source is the average lifespan of the LED, in hours (h).
3.12
Color coordinate drift
At a certain moment, the chromaticity coordinates of the LED light source deviate
from the value of the initial chromaticity coordinates, which are described by the
chromaticity coordinates (x, y) in the CIE 1931-XYZ colorimetric system.
4 Requirements
4.1 Power adaptability
4.4.4.1 Power
The power of the LED light source is directly related to the luminous flux required by
the specific application system. See Table 3 for the light source power of different micro
display projection systems.
4.4.4.2 Overload
The LED light source shall be able to withstand an overload test of 1.15 times the rated
power; the temperature of the LED light source chip shall not exceed the temperature
value specified in 4.4.6.
4.4.5 Average life
The average life of the LED light source is not less than 40000 hours.
4.4.6 Heat dissipation
The LED light source shall have good heat dissipation performance. The temperature
of each part of the outer surface of the LED light source shall not exceed 60 °C, in an
indoor working environment of 35 °C.
4.4.7 Noise
During normal operation, the noise shall not be higher than 36 dB at 1 m away from the
LED light source.
4.5 Electrical safety
The insulation resistance and electrical strength shall meet the requirements of 10.3 in
GB 8898-2011.The electrical clearance and creepage distance shall meet the
requirements of Chapter 13 of GB 8898-2011; the pollution level shall be level 2.
4.6 Environmental adaptability
4.6.1 Low temperature
The LED light source shall be able to withstand a low temperature working test of -
10 °C for 2 h.
4.6.2 High temperature
The LED light source shall be able to withstand a high temperature working test of
50 °C for 2 h.
4.6.3 Constant damp heat
The LED light source shall be able to withstand a constant damp heat working test of
5.4 Test of beam expansion and luminous brightness
According to the test device in Figure 7 of SJ/T 11394-2009, the luminous flux collected
by the integrating sphere at different radiation angles is measured, by moving the LED
light source to change the position with the standard detector, so as to obtain the
relationship curve between the luminous flux and the radiation angle. Using the
relationship between the luminous flux and the radiation angle obtained by the test, the
light collection efficiency at different radiation angles can be obtained, so as to obtain
the divergence angle of the light source according to the requirements of the light
collection efficiency; the beam expansion and luminous brightness are calculated with
the measured luminous area of the light source. The test results of the beam expansion
shall meet the requirements of different micro display projection systems.
5.5 Measurement of color performance parameters
The measurement of the main wavelength and spectral line width of the LED light
source shall be carried out, according to the test method specified in 5.3.5 of SJ/T
11394-2009.
5.6 Color coordinate drift
The color coordinate drift of the LED light source can be tested with a colorimeter. By
setting the test mode of the colorimeter, it can directly read out the color temperature,
color coordinates, color coordinates of the three primary colors of RCB of the synthetic
white light. By using the color temperature and color coordinates obtained by test,
through comparing them with the color coordinates at the initial moment, the color
coordinate drift can be obtained.
5.7 Electrical performance test
5.7.1 Power test
The input power of the LED light source is tested using an electrical parameter tester.
5.7.2 Overload test
The input power of the LED light source is adjusted to 1.15 times the rated power by
adjusting the input voltage, working for 15 minutes; the temperature of the LED light
source chip is measured with a thermocouple.
5.8 Average life measurement
Batch size N ≥ 10, under rated working conditions, the LED light sources of the batch
are lit for 15 minutes, to measure the initial luminous flux of each light source. After
that, the batch of light sources is turned off once after 12 hours of continuous operation,
each time is not less than 1 hour. The off time is not included in the life.
When the lumen maintenance rate of N/2 (rounded to the nearest integer after the
decimal point) LED light sources reaches 50%, the cumulative lighting time of the N/2-
th lamp in the detection order is the average life of the batch of LED light sources,
expressed in hours.
5.9 Heat dissipation test
The temperature is measured by thermocouples at 35 °C indoor temperature
environment, when the LED light source works for 30 minutes. Measure on the metal
surface, plastic surface, fan exhaust respectively; make 3 measurements at each location
and take the average value. Measure the temperature value of the LED light source 3
times and take the average value.
5.10 Noise test
After the LED light source is preheated for at least 30 minutes, measure according to
the requirements of GB/T 18313.
5.11 Electrical safety test
The test method for insulation resistance and electrical strength shall be carried out in
accordance with the test method specified in 10.3 of GB 8898-2011.The test method
for electrical clearance and creepage distance shall be carried out in accordance with
the test method specified in 13 of GB 8898-2011.
5.12 Environmental adaptability test
5.12.1 Lower limit test of working temperature
Performed in accordance with GB/T 2423.1-2008 "Test Ad". The test sample shall be
initially tested. After the temperature reaches the specified value, it shall be powered on
for 2 hours, to check whether the test sample is working normally. After 2 hours of
recovery, the final testing shall be carried out.
5.12.2 Upper limit test of working temperature
Performed in accordance with GB/T 2423.2-2008 "Test Bd". The test sample shall be
initially tested. After the temperature reaches the specified value, it shall be powered on
for 2 hours, to check whether the test sample is working normally. After 2 hours of
recovery, the final testing shall be carried out.
5.12.3 Constant damp heat test
Performed according to GB/T 2423.3-2006 "Test Cab". The test sample shall be initially
tested. After the temperature and humidity reach the specified value, power on and work
for 2 hours, to check whether the test sample is working normally. After 2 hours of
recovery, the final testing is carried out. The sample shall still be able to work normally.
rejection quality level (RQL) is 65, the judgment array is Ac = 1, Re = 2.
6.2.3 Samples of type inspection shall not be delivered to the ordering party as qualified
products.
7 Marking, packaging, transportation, storage
7.1 Marking
The LED light source component shall have the following clear and firm markings.
Product name, trademark, model and product number (batch number) and product
barcode; nature of power supply, rated voltage, power frequency, power consumption
and user warning signs to prevent electric shock; inspection certificate, production date,
Chinese name of the manufacturer, address.
The packaging, storage, transportation graphic signs shall comply with the provisions
of GB/T 191.
7.2 Packaging
7.2.1 Each packaging box shall be marked on the surface.
a) Manufacturer's trademark and name, address, barcode;
b) Product name, model;
c) Standard number.
7.2.2 The outer packaging box of the product shall indicate.
a) The name, address, trademark of the manufacturer;
b) The name and model specifications of the product;
c) Weight;
d) External dimensions;
e) Quantity;
f) Production date.
7.3 Transportation
During transportation, the product shall avoid severe vibration, rain and snow, sun
exposure, contact with corrosive gases, or mechanical damage.
7.4 Storage
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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