Outdoor
LED shop lcd full-color display online automatic detection
The
color difference or brightness difference in outdoor LED shop lcds is caused by
the inadequate control of a single module in the production process, but the
lack of testing in the module process or the inability to implement 100%
testing will bring uncertain factors to the quality of the entire screen after
assembly. This article discusses the online automatic detection of outdoor LED
shop lcd modules, hoping to provide help for the development of the industry.
According
to the inspection requirements of the outdoor LED shop lcd module, the original
manual inspection was transformed, and the system was designed to integrate
machine vision technology into the inspection process of the LED module. The
LED module was realized without changing the hardware of the LED module. The
online, automatic, and rapid quality inspection of the LED module meets the
inspection requirements of customers and realizes the standardization of module
production. It will certainly have a larger application market in the field of
rapid on-site inspection of LED unit boards. It is not only conducive to
improving the economic efficiency of the enterprise itself, but also can
promote the technological progress of the industry, promote the development of
China\'s optoelectronic industry, improve the technical level of my country\'s
industry, reduce and replace imports, and have significant economic benefits.
Develop
a set of control system software to control the display pattern of the outdoor
LED shop lcd module, use a high-precision color brightness sensor probe to
detect the brightness and chromaticity of the module, and then use the
self-developed data acquisition and analysis software to determine the display
module Whether the brightness and chromaticity uniformity is qualified,
statistics and records are carried out, so as to realize the online automatic
detection and industrialization of the brightness and chromaticity consistency
of a large number of outdoor LED shop lcd modules.
The
principle of realizing the online detection of LED full-color screen modules is
that the camera (including brightness and chromaticity probes) collects the
luminous signal of the LED full-color display module on-site and the software
analyzes the results in real-time. The camera brightness and chromaticity
calibration are realized by standard luminance and colorimeter, as shown in
Figure 1 below.
Outdoor
LED shop lcd design flow chart
(1)
Outdoor LED shop lcd module automatic positioning detection
The
LED full-color display module automatically enters the online detection system
through the assembly line and triggers the online detection system for
detection after automatic positioning. The positioning system is also
responsible for supplying power to the module and realizes the color conversion
of the module under several conditions, such as plus or minus 45 degrees, 90
degrees, and so on. After the signal is stable, the detection system is
triggered to test the brightness and chromaticity distribution.
(2)
Outdoor LED shop lcd brightness, chromaticity distribution detection, and
quality classification
The
LED full-color screen brightness and chromaticity distribution detection system
is composed of a camera and a high-precision CCD. The camera can change lenses
with different focal lengths as needed. The detection system collects image
signals, and realizes the positioning of LED pixels through technologies such
as image binarization processing and image threshold segmentation of histograms;
uses the RGB color model in the image to calculate tristimulus values for color coordinates, color purity, and
correlated color temperature Equal chromaticity parameter calculation; convert
the RGB color model used in the image into XYZ and YUV color models (Y
represents brightness, U and V are the two components of color), and the
brightness of each pixel can be calculated conveniently and quickly value. On
this basis, the statistical analysis and processing of the uniformity of the
brightness and chromaticity distribution of the full screen are carried out,
and the quality of the screen is classified according to the production
requirements to meet the requirements of the quality consistency of the control
screen.
(3)
Calibration of outdoor LED shop lcd detection system
The
response of the detection system composed of the camera and the high-precision
CCD does not meet the requirements of the XYZ tristimulus color matching
function in the chromaticity system, so the response signal must be calibrated
to complete the chromaticity and brightness test requirements. The calibration
of the LED full-color screen detection system is completed by a calibration
system composed of a standard lamp, a standard spectrum colorimeter and a
high-precision spectrometer. Use the standard signal generated by the
calibration system to construct a mathematical model to establish the response
function of the detection system corresponding to the color matching function
of the XYZ tristimulus value. The model contains a series of response functions
under different test conditions such as different lenses and different
apertures, which can be automatically called in actual tests to achieve
one-time calibration and continuous use. Simplify the complexity of use and
greatly improve production efficiency.
The
shop lcd application
1.Information
display: passenger flow in the scenic spot, publicity in the scenic spot, event
announcements, broadcast announcements, etc.;
When
there is a lot of traffic during holidays, the shop lcd will play a bigger
role. The RISINGLCD shop lcd can show scenic spots, release warm reminders,
real-time environmental monitoring information, temperature reports, etc.,
which not only allows scenic visitors to take the lead in enjoying the beauty
of the scenery but also makes playing more convenient, safe and enjoyable.
2.
Performing stage beauty: folklore art performances, presenting wonderful
moments;
Now
the scenic spots will fully excavate local art and folk culture to produce rich
programs to attract tourists. RISINGLCD shop lcd makes full use of its
excellent video playback function and color display effect. The stage is
designed with a shop lcd, a flexible and changeable background, and the sound
and light effects of the stage are also true and magical. It brings a strong
visual impact to the visitors, makes the audience feel immersive, and allows
visitors to appreciate the strong Regional style stage performances.
3.
Inquiry and interaction: practical interactive screens in scenic spots;
For
example, query maps, tour routes, watch introductions to scenic spots, conduct
interactive visits, and other rich activities (query interaction). At present,
the RISINGLCD shop lcd has been widely used. Ticket collection machines,
inquiry machines, etc. all use the Internet + cultural tourism to realize the
conversion from offline to online and increase user retention.
RISINGLCD
shop lcd relies on the advantages of excellent performance, ultra-high price,
spot supply, and localized services. The installation of S-LCD displays in
scenic spots has become a trend and trend in the development of smart tourism.
In the future, S-LCD displays will undoubtedly have more room for development
and penetrate into more application areas in scenic spots.
The
shop lcd supplier
RISINGLCD (WITH BRAND OF RISING STAR)
is a professional highlight LCD manufacturer from China, as a superior global
supplier, a modernized high-tech enterprise with 100 employees including 20
highly qualified and well-trained engineers. Due to our 2, 000 square meters’
factory and a monthly production capacity of 10, 000 pieces, we can meet your
demands. Specializes in manufacturing and distributing all types of LCD
modules, LCD monitors, LCD digital signage, Touch Screen, etc. Now our products
have been widely used in games, finance, communication, electricity,
transportation, hospitals, estates, travel and government lines, stations, 4S
shops, museums, exhibitions, libraries, hotels, and entertainment KTV. Our markets
cover Asia, North America, Africa, the Middle East, Europe, Central, and South
America, and Oceania. For more information about LCD, welcome to contact us
via: risinglcd@foxmail.com