Radiant Imaging is a leading global provider of technology and products for color and brightness measurement of CCD imaging systems. Its newly released Vision system optimizes the visual quality of LED displays throughout their lifecycle. Recently, Optoelectronics News Network had the honor to participate in a press conference organized by Radiant Imaging China agent Sha Yibo Design Systems Trading (Shanghai) Co., Ltd., and had a face-to-face exchange with Radiant Imaging CEO Ronald Rykowski, let us The latest LED display correction technology has a deeper understanding.
Compared with other display products, LED display has the advantages of clear image, bright color, good stability, high brightness, high luminous efficiency, long life and low power consumption. In addition, LED display is not limited by space and can be designed according to user requirements. The size of the screen, representing text, graphics, images. At present, LEDs are developing towards higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, and full colorization. Nowadays, the global LED large-screen industry and China's LED large-screen industry are in a stage of rapid growth. Especially in recent years, driven by the trend of energy saving and consumption reduction, LED technology has been widely used, and the market capacity will maintain a growth rate of about 15% per year.
According to DIGITIMES forecast, the output value of domestic large-scale LED display screens was 1.18 billion US dollars, 1.64 billion US dollars, and 2.32 billion US dollars from 2008 to 2010, with annual growth rates of 34.1%, 39%, and 41.5%, respectively. Among the mobile phone backlights, car lights, lighting, electronic equipment, etc., the products with the most significant annual growth rate.
LED technology shines in the Beijing Olympics. This is the LED drawing axis designed by Beijing Liard.
LED display calibration technology is the key to ensure quality
All along, the characteristics of LEDs are very different due to manufacturing processes, etc. When integrating the display modules made of these LEDs into LED displays, if there is no sufficient compensation for these differences, it will lead to LED display. The difference in brightness and color is clearly visible; at the same time, after the LED display is installed for a period of time, the brightness and chromaticity of the LED will change with time, but the degree of attenuation of each LED is different, which will lead to LED display. The visual quality of the screen is greatly reduced; in addition, the replacement of the damaged LED module during the use of the LED display causes the new module to be mismatched with the entire screen, which will greatly reduce the visual quality of the LED display.
At present, the number of LED display screens is relatively large, and its technology is relatively mature. The structure and principle of the display screens manufactured by various enterprises are basically similar. How to improve the technical performance of the display screen and reduce the cost is the key to competition among enterprises. Now, the prices of LED displays sold on the market are basically the same. However, the quality of displays produced by different companies is different. The reasons are various, including the quality, brightness, brightness uniformity, packaging, etc. of LED display modules. The difference in technology, the way data is transmitted, the difference in anti-interference ability, and the difference in control circuits, and the correction of LED displays can effectively help companies solve these problems. “We found in the application that the LED-corrected display not only has better uniformity, but also shows better brightness, color effect and longer life. Radiant Imaging CEO Ronald Rykowski said that Radiant Imaging is a company. The world's leading provider of technology and products for color and brightness measurement of CCD imaging systems, the latest release of the Vision system optimizes the visual quality of LED displays throughout their lifecycle.
Rykowski pointed out that there are still few companies using LED display correction technology, but as the industry demands more and higher quality displays, LED display correction technology will be greatly promoted and eventually become quality assurance. One of the key technologies.
Mr. Ronald Rykowski, CEO of Radiant Imaging
Innovative technology helps LED display manufacturers
According to Rykowsk, in order to meet the company's need for LED display modules, the correction of existing LED screens, and the uniformity of replacement modules and other modules (remaining screens), Radiant Imaging introduced the Vision system for the entire life cycle of LED displays. Offering a special solution to enhance its visual quality, the system includes the VisionCAL LED display calibration system, the VisionLINK LED display correction video processor and the VisionMATCH LED display module replacement calibration system.
VisionCAL is Radiant Imaging's LED display calibration system, formerly known as PM-LED C. VisionCAL combines RadiantImaging's ProMetric imaging brightness/colorimeter to perform pixel-level measurements on LED displays and VisionCAL software to generate correction factors. The correction factor adjusts each individual LED in the LED display through the control system of the LED display to achieve the desired brightness and chromaticity consistency.
As for VisionLINK, it is the latest product of Radiant Imaging, which calibrates the video processor online. “Not all LED displays currently support and implement correction factors, especially those of the early LED displays. VisionLINK solves this by applying the VisionCAL generated correction coefficients directly to the DVI video signal and then to the LED display. The screen is used to achieve the corrective effect.†Rykowsk said that VisionCAL can interface directly with VisionLINK for the correction factor, which allows the previous “uncorrectable LED display to be calibrated.â€
isionMATCH is also the latest product of Radiant Imaging, which belongs to the LED display module replacement correction system. VisionMATCH provides fast, accurate LED module calibration. When the module is replaced in the LED display field, VisionMATCH can adjust the correction factor of the new module to match the surrounding LED module. Currently VisionMATCH has entered the field test phase.
All of these products are based on Radiant Imaging's scientific CCD imaging system for testing brightness and chromaticity, wide viewing angle measurement systems and application software.
In addition to these products, Radiant Imaging also offers VisionTUNE LED display calibration services, and VisionTUNE is Radiant Imaging's new business for LED display measurement and calibration services. Radiant Imaging provides consulting, qualification and on-site calibration services for LED displays and annual calibration support services. The VisionTUNE service can be applied to any LED display or panel, including rental screens. Tuning throughout the life cycle ensures the visual quality of the LED screen.
The best effect is the comfort of your eyes.
Rykowsk said that the best way to show the effect of LED display is to look at the comfort level of the human eye. Of course, to meet the needs of the human eye, it is necessary to put forward certain requirements for the correction technology.
An LED display calibration system with a CCD seems simple, but it is actually very complicated, and the following points need to be met to complete the calibration requirements.
One is the accurate measurement of color. To do this is difficult for a narrow spectrum source, so a wide spectrum source (wearing CIE tristimulus filter) is required. The second is the need for accurate brightness measurement, which requires a high dynamic range CCD (14bit). "At present, the brightness tester that has been introduced in China can meet the needs of manufacturers, but the color measurement technology is still not very mature." Beijing Liard Electronic Technology Co., Ltd. Lu Changjun, technical director, said at the press conference that the company was also the most successful LED display manufacturer with the Radiant calibration system.
In addition to accurate measurement of color and brightness, it is also necessary to provide independent control of each color filter in the event of excessive exposure, with built-in automatic ND filter. In addition, a Full Frame CCD is required to eliminate moirs or aliasing. It also needs to accurately register and identify each LED, with powerful data processing capability and high-resolution CCD. It should be noted that the CCD used here is essentially different from the traditional camera. The 6 million pixels used here. The CCD is equivalent to an ordinary 18 megapixel RGB CCD.
Of course, it is also necessary to have the ability to adjust the tilt angle. Usually, some LED displays are installed at a high position, or a certain angle or tilt angle is installed on the spot. The shooting is easy to cause uneven brightness, and Radiant Imaging can provide tilt angle correction.
Lu Changjun, technical director of Liard Electronic Technology Co., Ltd., said that LED display will develop in two aspects in the future. In terms of outdoor display, the spacing is not necessarily small, but customers' requirements for stability and reliability will be more and more. High, which also reflects the fact that the customers that have emerged have become more realistic and rational. In addition to the performance improvement, a creative new product like Suzhou Tianmu is also a hot spot in the future. In terms of indoor display screens, it will be developed in the direction of fine spacing, and it is expected to replace traditional display technology in some fields. "Of course, this will also bring new challenges to the calibration technology, such as whether the existing 16bit can meet the demand, and the number of points required for measurement is more."
After correction, LED display effect comparison
Rykowsk said that in the future, Radiant will continue to develop advanced calibration measurement technology according to market and user needs, and he is very optimistic about the market demand for LED display correction technology in the future. "Few manufacturers used correction technology two years ago, but in recent years, the world More and more companies are beginning to pay attention to and adopt calibration technology. I believe that more manufacturers will adopt LED display correction technology in the future. With the wider application of LED display, we believe that the need for on-site inspection and correction in the future. It will be the biggest."
CYBERNET provides relevant Radiant Imaging training and services
LED display calibration service and LED (and other small light source) luminous intensity distribution test services
Based on more than 20 years of industry experience and strong support from Radiant Imaging, Cybernet provides customers with quality project services, including LED display calibration services, LED (and other small light sources) luminous intensity distribution testing services, LEDs and other light sources. , optical properties detection of lamps (near field and far field optical characteristics detection), calibration services for PM series CCD cameras, etc.
LED display point-by-point calibration technology training
Cybernet offers a range of LED display point-by-point calibration technology training and other training, which is demonstrated by our experienced engineers on-site and scheduled for on-board operation. Please refer to the website for the training schedule and registration method.
Attached company introduction:
CYBERNET Group
It is the world's largest CAE (including electronics, optics, machinery, etc.) technology service company. It was established in Tokyo, Japan in 1985. Since 2006, the company has actively expanded its international service concept and established branches in China, Taiwan and the United States. the company. CYBERNET Group is a Japanese listed company specializing in CAE software, industry solutions and related technical services. Over the past 20 years, it has established long-term partnerships with more than 20 top technology companies worldwide, providing customers with more than 50 CAE design simulation software. And check calibration hardware products. RandiantImaging is our long-term strategic partner.
RadiantImaging
Located in Seattle, USA, it is a company with more than 20 years of history in optical measurement and inspection. Since its inception in 1992, it has become a world-class supplier of optical measurement systems and services. RI's measurement systems can be used in a wide range of industries including lighting, display, R&D, product manufacturing and quality control. On June 11 this year, RI Company released the "Vision Family" brand for the large-screen display correction products, which satisfies the needs of different users.
Beijing Liard Electronic Technology Co., Ltd.
A company dedicated to providing customers with video and information publishing solutions and LED lighting system solutions. Since its establishment in 1995, it has built nearly 3,000 projects across the country (except Taiwan Province), installed tens of thousands of displays, and is recognized as a leader in the field of LED video and information release displays.
Reporter: Rao Chuhong, Yang Qiuni, Editor: Yu Zhantao
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