【 Weak current College 】 led display system theory and engineering 】

(1) use of imported high-quality LED full colour display for chip production: a perspective on the big, small power consumption, color uniform, panel thickness thin and the screen light weight, high reliability, easy maintenance, etc.
(2) use of PCTV card: this card is a high-performance set display, capture, video capture capabilities of multimedia display card, the card accompanied by a Studio editing software. Studio is a Pinnacle Systems company's award-winning software, it with the existing universal ordinary multimedia card compare it with the following advantages:
① enabling users to your own PC making a digital movie, capture video, edit, and add the style of the title, conversion, and even your own musical and narrative in digital video production.
② S t u d I o can let the user choose to MPEG or AVI file format output video and save to CD disc, or displayed on the Web site, or create a video email. Because the Studio can and Pinnacle Systems Company of a series of capture devices, video capture is not easy before.
③ S t u d I o application software like a VCR from easy to use with good, better, best quality forms and calculate how much video can be stored on computer. Studio automatically find and record the scene change, make editing changes easily.
④ use Studio to author is a fast and interactive process. Use the instant preview window you can edit at any time in the preview of the film, see is what you get.
⑤ If you don't like a title or effect, may make a change and you can immediately see the change, video editing has never been like this fast and fun. Free, personalized enough is enough, but also has background music, voiceover, and more. (3) uses the latest technology: DVI interface DVI interface (Digital Visual Interface) is a PC and digital flat panel monitor (including) interface of industry standards, as we all know, is a digital, i.e. it deals with information on all digital, but so far the most widely used CRT monitor(such as TV sets) is analogue. Therefore the computer processing of data sent to the monitor display, you must be a d/a conversion (D/A), this process has resulted in the loss of information and displays the result of a defect. HDTV LCD, PDP, etc, a new generation of the monitor itself is digital, using traditional methods, computer graphics card output (analog) but also through the ADC (A/D) to be sent to the monitor, which in turn caused new loss and trouble. Using DVI interface, the development of LED display system directly from the PC DVI connector fetch, you do not need Galaxy card such as a dedicated video card or a special card to the PC machine, in the absence of D/A and MD conversion process, to avoid the loss of image detail, thereby ensuring the computer image in the display of a perfect reproduction. At the same time as the DVI is an industry standard although bandwidth of up to 83MHZ, also work well. Now with support for DVI VGA (640 × 480) to HDTV (1920 × 1080) and QXGA (2048 × 1536) of all display modes. In addition to a DVI connector, the development of LED display system, in a stable and reliable display data, you can set many important features integrated together, for example: ① ② without data loss, do not be PC, ③ easy upgrades, General display card memory to the memory card, but 8M to 128-256M, ④ window position and size adjustments; ⑤ frame rate as high as $ 60HZ; ⑥ nonlinear adjust output, better suited to the human eye watch; ⑦ 100 level screen brightness control; ⑧ constant current driver; ⑨ cell plate red, green, and blue brightness separately adjustable, elimination of mosaic. (4) use of the indoor full color system: this chip to display the data in addition to the completion of assigned tasks, its characteristic is to receive 8-bit (8 bit) display data converted to 12-bit PWM output pulse, so that the display screen for 4096 (12bit)-level grayscale, control, assurance of nonlinear 256-level grayscale, vision reaches full-color visuals,able to fundamentally resolve the digital display system because the amount of data transferred is too large and complex systems. Has the following characteristics:
① simplicity as the system is the most complex data conversion part to chip implements internal logic so that the system becomes very simple.
② serviceability and simplicity is directly related to the system for easy maintenance, eliminating the complex control section, system maintenance became a junior technical staff can complete the work, both to reduce overall maintenance costs, and improve user satisfaction.
③ high reliability system control part of simple further brings the system's high reliability, and this is mainly due to the integrated chip technology compared to separator technology has several times of stability.
④ cost-effective system with the most reliable performance screen color 4096 shades of control, the image displays a vivid, natural, achieving the same display control effect.
⑤ UCSD, structured design and development direction of the current industry, large screen display system screen body structure using cell-based design, system wiring of intuitive and easy to not only ensure the display of size can be adjusted according to need stitching, and makes the system installation, commissioning and maintenance become extremely simple, so as to minimize the display system's invisible failure rate.
⑥ industrialization reliability design system adopts unit design, replaced the traditional design of a large number of separator parts so that the system's reliability and stability increases.
⑦ full programmes system contains the data source, transport, equipment, data processing, data distribution and software management tools that enable the construction of the LED display screen into a simple standardized. The technology in practical application process is constantly developing and perfecting, has become a most mature, stable, easy to implement system programme.
>⑧ equivalent CRT display led display most core performance indicators for each primary color (red, green, blue) implements the brightness levels of gray, the display of the current international standard is to require every base reached 256-level gradation of vision. Special grayscale control chip built-in processing logic can output reached 4096-level grayscale, and select and CRT monitor phase fitting 256-level gradation of output, so that the overall image effects more clear, lifelike, contagious.
⑨ high resolution and high refresh rate in addition to the levels of gray, the display of the other two performance indicators is the resolution and refresh rate. Thanks to led display itself features and requirements, the traditional solution is often to lose one or two criteria as another indicator of increased price. As a result of chip each pin per second data output reaches 1 trillion, far more than the traditional scheme of data export capabilities, thereby making the problem fundamentally. This full-color systems can also support 1024 × 768 screen resolution and up to 300Hz screen refresh rate, far more than the traditional solution of performance indicators that display a stable, flicker-free, non-smearing. (5) use of constant current driver: the circuit technology is mature, reliable operation is already in full color on a wide range of use, high performance price ratio, as at present companies commonly used constant current driver IC, better resolution LED pipe pressure drop discrete defects and of good performance, eliminating mosaic. (6) fiber-optic transmission, do not decay of fiber-optic transmission technology:
① fiber transmission frequency bandwidth, communications capacity. Fiber available bandwidth of about 1.25G, frequency bandwidth, improves scanning frequency and the refresh rate, the company design LED full color screen refresh rate ≥ 200Hz/s.
② fiber transmission loss low, the relay and long distance. The maximum distance you can reachthe relay 15000 m, increased reliability and stability.
③ fiber transmission resistance to electromagnetic interference. Fiber is an insulator materials, it is not affected by the nature of the lightning, ionospheric changes and sunspot activity of interference or electrified railway feeders and high-voltage equipment and other industrial electrical interference.
④ fibre diameter thin, light and soft. Optical fiber core diameter is very thin, approximately 0.1mm, it has only one percent of single-tube coaxial cable; cable diameter is also very small, 8-core cable cross-section diameter approximately 10 mm instead of the standard coaxial cable for 47mm. The use of fiber make transmission system in occupies small space. Enable easy construction of wiring.
⑤ fiber transmission in addition to the above outstanding advantages, but also has strong corrosion resistance, resistance to nuclear radiation, energy consumption small advantages.