SJ/T 11746-2019 English PDF (SJ/T11746-2019)

Delivery: 2 working-hours manually (Sales@ChineseStandard.net)
Need delivered in 3-second? USA-Site: SJ/T 11746-2019
Get Quotation: Click SJ/T 11746-2019 (Self-service in 1-minute)
Historical versions (Master-website): SJ/T 11746-2019
Preview True-PDF (Reload/Scroll-down if blank)

SJ/T 11746-2019: Measurement methods of display performence for UHD television
SJ/T 11746-2019
SJ
ELECTRONICS INDUSTRY STANDARD
ICS 33.160.25
M 74
Measurement methods of display performance for UHD
television
ISSUED ON. DECEMBER 14, 2019
IMPLEMENTED ON. JULY 01, 2020
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 4
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 General... 7
4.1 General requirements... 7
4.2 Video test signal... 7
4.3 Test instruments... 15
4.4 Test conditions... 15
5 TV test method... 17
5.1 Brightness... 17
5.2 Contrast... 18
5.3 Brightness uniformity... 20
5.4 White chromaticity coordinates... 21
5.5 Primary color chromaticity coordinates... 21
5.6 Correlated color temperature... 22
5.7 Color gamut coverage... 22
5.8 White chromaticity non-uniformity... 24
5.9 Reproduction rate... 25
5.10 Static clarity... 26
5.11 Dynamic clarity... 26
5.12 Brightness viewing angle... 27
5.13 Chromaticity viewing angle... 28
5.14 Pixel defects... 31
5.15 Residual image... 32
5.16 White balance error... 34
5.17 Relationship between brightness uniformity and viewing angle... 34
5.18 On-off ratio... 35
5.19 Response time... 36
5.20 Grayscale response time... 37
5.21 Electro-optical transfer characteristics... 38
5.22 Brightness start-up characteristics... 39
5.23 Light leakage... 39
5.24 Black level stability... 40
5.25 Display format... 41
5.26 Gamma viewing angle... 41
5.27 Color sharpness... 43
5.28 Dark field uniformity... 44
5.29 Mura... 45
5.30 Curvature... 45
5.31 Curved edge on-off ratio... 46
5.32 Resolution... 47
Appendix A (Informative) Image contrast and brightness adjustment process... 49
References... 50
Measurement methods of display performance for UHD
television
1 Scope
This standard describes the test conditions and test methods for ultra-high-definition
televisions (hereinafter referred to as televisions).
This standard applies to ultra-high-definition televisions and ultra-high-definition
displays with display modes such as LCD; other types of display modes can use it as a
reference.
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.
SJ/T 11324 Terminology of digital television receiving equipment
GY/T 307 Parameter values for ultra-high definition television systems for
production and program exchange
3 Terms and definitions
The terms and definitions defined in SJ/T 11324, as well as the following terms and
definitions, apply to this document.
3.1
Response time
The response process of each pixel point changing from dark to bright and from
bright to dark under the action of the excitation signal. The response time is equal
to the sum of the rise time and the fall time.
3.2
Rise time
4 General
4.1 General requirements
4.1.1 Test environment conditions
The test is carried out under the following standard atmospheric conditions for
measurement.
- Temperature. 15 °C ~ 35 °C, preferably 25 °C;
- Relative humidity. 25% ~ 75%;
- Air pressure. 86 kPa ~ 106 kPa.
4.1.2 Power supply
The test shall be carried out under the condition of rated power supply voltage. The
power supply voltage shall vary within ±2% during the test; the power supply frequency
shall fluctuate within ±2%; the harmonic component shall fluctuate within ±5%.
4.1.3 Test site
The test shall be carried out indoors without interference from external electromagnetic
fields. If interference can affect the test results, the test shall be carried out in a shielded
room. The test shall be carried out in a dark room. The stray light illumination on the
TV screen surface shall not exceed 1 lx, that is, when the TV is in the off mode, the
illumination on the screen surface shall not exceed 1 lx.
4.2 Video test signal
4.2.1 Overview
The signal shall comply with the provisions of GY/T 307.The 4K ultra-high-definition
test uses a 3840×2160/50/1.1 format signal; the 8K ultra-high-definition test uses a
7680×4320/50/1.1 format signal. The encoding format is 10 bit.
4.2.2 Extreme eight gray scale signal
The extreme eight gray scale signal is a brightness signal, that generates two rows of
gray scales on a 50% gray background, as shown in Figure 1.The full black field level
= 0%; the full white field level = 100%; the first row of gray scales is. 0%, 5%, 10%,
15%; the second row of gray scales is. 85%, 90%, 95%, 100%; each gray scale rectangle
occupies 5% of the full screen area and has an aspect ratio consistent with the entire
display image.
4.3 Test instruments
4.3.1 Video test signal generator
The video test signal generator shall be able to generate the test signals required for the
test; the output interface adopts a digital video interface.
4.3.2 Luminance meter and colorimeter
The luminance meter measures the brightness of a small area on the screen; its
measurement range is at least 0.2 cd/m2 ~ 2000 cd/m2.
The colorimeter shall be able to measure the chromaticity coordinates (x, y) or (u', v')
of a small area on the screen, when the brightness is less than 2 cd/m2.It is
recommended to use a spectrophotometer.
4.4 Test conditions
4.4.1 Adjustment of standard working state
Unless otherwise specified, the standard working state of the TV is adjusted according
to the following steps.
a) Initialization state. Restore the image settings of the TV to the factory setting. If
there is no factory setting, adjust the image mode to "standard" or a corresponding
mode; set other menus to the settings after powering on. The state at this time is
the initialization state of the TV. Record this state.
b) Ambient light control adjustment. Turn off the ambient light control of the TV. If
it cannot be turned off, in order to ensure the smooth progress of the display
performance test, only provide an illumination of not less than 300 lx at the light
sensor; ensure that the screen illumination of the TV is less than or equal to 1 lx
in the off mode. Record this state.
c) Dynamic backlight adjustment. If there is no special provision, turn off the
dynamic backlight of the TV. If it cannot be turned off, record this state.
d) Aspect ratio adjustment. Adjust the aspect ratio of the TV to full-screen display
mode, that is, the aspect ratio mode with a re-display rate of 100%. If there is no
such mode, adjust the aspect ratio to the display mode with the highest re-display
rate. Record this state.
e) Contrast and brightness adjustment. Input the extreme eight grayscale signal;
change the position of the contrast and brightness controller; adjust to the extreme
state where the extreme eight grayscale signal can be clearly distinguished. If the
b) White window signal.
5.1.2.2 Test steps
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1; the position of the
optical measuring instrument meets the requirements of 4.4.3;
b) Display the white window signal; use a luminance meter to measure the brightness
value of point P0 specified in the uniformity test point position diagram; the
measured value is the brightness;
c) Display the full white field signal; use a luminance meter to measure the
brightness value of point P0 specified in the uniformity test point position diagram;
the measured value is the useful average brightness.
5.1.3 Result expression
The unit of measurement of the test result is candela per square meter (cd/m2).
5.2 Contrast
5.2.1 Overview
This article tests the contrast of the TV. Among the following two test methods, test
method 1 is the arbitration method.
5.2.2 Test method 1
5.2.2.1 Test conditions
Video test signal. black and white window signal. During the test, the displayed image
other than the tested window is shielded. The exposed image range shall not be larger
than the tested window size.
5.2.2.2 Test steps
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1.The position of the
optical measuring instrument meets the requirements of 4.4.3;
b) Display the black and white window signal. The luminance meter is placed on the
perpendicular lines of the white window and the 4 black windows, respectively;
c) Measure the brightness values of the five windows respectively; record them as
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1; the position of the
optical measuring instrument meets the requirements of 4.4.3;
b) Display the full red field, full green field, full blue field signals respectively;
measure their chromaticity coordinates (u', v') with a colorimeter at the P0 point
specified in the uniformity test point position diagram.
5.5.3 Result expression
The test results are expressed in chromaticity coordinates.
5.6 Correlated color temperature
5.6.1 Overview
This article tests the color temperature of the TV screen.
5.6.2 Test method
5.6.2.1 Test conditions
Video test signal. Full white field signal.
5.6.2.2 Test steps
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1; the position of the
optical measuring instrument meets the requirements of 4.4.3;
b) Display the full white field signal; use a colorimeter to measure its color
temperature value at the P0 point specified in the uniformity test point position
diagram.
5.6.3 Result expression
The test results are expressed in Kelvin (K).
5.7 Color gamut coverage
5.7.1 Overview
The color gamut coverage is the percentage of the triangular color gamut area, which
is composed of the chromaticity points of the three primary colors (R, G, B), on the
b) Adjust the horizontal moving speed of the test card to 5.0 ppf; observe the
distinguishable parallel line clusters; record the clarity value of each gray target
under each gray background.
5.11.3 Result expression
The test result takes the worst value at 5.0 ppf and is expressed in TV lines.
5.12 Brightness viewing angle
5.12.1 Overview
For the brightness viewing angle, measure the horizontal and vertical viewing angles
when the brightness of the center of the screen is reduced to 1/3.
5.12.2 Test method
5.12.2.1 Test conditions
Video test signal. Full white field signal.
5.12.2.2 Test steps
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1; the position of the
optical measuring instrument meets the requirements of 4.4.3;
b) Display the full white field signal; use a luminance meter to measure the
brightness value L of point P0, as specified in the uniformity test point position
diagram, at the rated observation position S0;
c) Move the position of the luminance meter horizontally to S1 and S2; obtain the left
and right viewing angles when the brightness of point P0 becomes L/3.The
horizontal viewing angle of 1/3 brightness is the sum of the left and right viewing
angles;
d) Move the luminance meter vertically to S3 and S4.When the brightness of point
P0 becomes L/3, obtain the upper and lower viewing angles. The vertical viewing
angle of 1/3 brightness is the sum of the upper and lower viewing angles. If the
lower viewing angle between S0 and the floor of the room is not enough to
measure 1/3 brightness, the screen can be tilted to increase the angle, as long as
it does not affect the display performance.
5.16 White balance error
5.16.1 Overview
This clause characterizes the degree to which the white chromaticity coordinates of the
TV change with the change of image brightness.
5.16.2 Test method
5.16.2.1 Test conditions
Video test signal. White window signal.
5.16.2.2 Test steps
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1; the position of the
optical measuring instrument meets the requirements of 4.4.3;
b) Display the white window signal; change the level of the window signal from 10%
to 100% at 10% steps; use a colorimeter to measure the chromaticity coordinates
of the white window (u', v').
5.16.3 Representation of results
The test results are expressed as the sum of the differences Δu' and Δv' between the
chromaticity coordinates of each level and the chromaticity coordinates at 50% gray
level.
5.17 Relationship between brightness uniformity and viewing angle
5.17.1 Overview
Due to the directionality of the TV screen, the brightness will change with the change
of viewing angle. This article is to observe the brightness uniformity from the horizontal
and vertical viewing angles, when the brightness at the center of the screen is reduced
to 1/3.
5.17.2 Test method
5.17.2.1 Test conditions
Video test signal. Full white field signal.
5.17.2.2 Test steps
The test steps are as follows.
a) Adjust the TV to the standard working state specified in 4.4.1; the position of the
optical measuring instrument meets the requirements of 4.4.3.
b) Display the full white field signal; use a luminance meter to measure the
brightness value L of point P0 specified in the uniformity test point position
diagram, at the rated observation position S0.
c) Move the position of the luminance meter horizontally to S1 and S2; obtain the left
and right viewing angles when the brightness of point P0 becomes L/3.Then
measure the uniformity of brightness from the left and right viewing angles
according to 5.3.2.
d) Move the position of the luminance meter vertically to S3 and S4; obtain the u...