Sports Venue LED Displays Technology Showcase
Jan 5, 2011 12:00 PM, By Bennett Liles
Using an automated vision calibration process, Mitsubishi Electric adjusts the brightness tolerance of each LED on the Diamond Vision display modules to match brightness across the entire display. The face of each unit uses a pixel-placement-and-louver combination to eliminate color shift and maintain contrast in high-ambient-light conditions. Three display controllers are available, the most advanced of which provides simultaneous presentation of live video, data, messaging, animation, and graphics on any part of the screen. The most spectacular example of Mitsubishi's Diamond Vision is the 544-ton center-hung screen in the Dallas Cowboys Stadium, where each sideline display—composed of AVL-ODQ10 modules—is nearly 11,500 square feet and contains more than 2.5 million LEDs. The two smaller end-zone screens are nearly 1500 square feet. The Diamond Vision LEDs are arranged so that each pixel has one green, one blue, and two red lights, while the processing allows sharing of LEDs between adjacent pixels to create dynamic pixels. In total, the Cowboys Stadium screen has 30 million LEDs for showing 1080p video signals using a pitch of 20mm on the side screens and 16mm on the end displays, consuming a total of 1430kW.
The LED-15BF1 large screen "true pixel" LED panel from NEC Display Solutions has discrete red, blue, and green LEDs in a through-hole design using 15.625mm pitch with 64-level dimming capability and 14/16-bit color processing for a maximum of 7500 cd/m² brightness and 4500:1 contrast ratio. The viewing angle to half brightness is 70 degrees to either side, 15 degrees up and 30 degrees down from center. The weight of each module is 31lbs., and maximum power consumption at full white is 135W. Using long-life Nichia LED lamps for accurate color matching between modules, the IP65-rated unit has an expected lifetime of more than 100,000 hours and uses a DVI-D dual-link connection for video and control. The low-latency video processing with 800Hz refresh rate features tearless frame-rate conversion for connection of any source to any display. The control software provides automapping of pixel allocation and auto locating in the videowall to ensure each module gets the correct portion of the overall display image. Each module offers both front and rear service ports to accommodate any installation structure.
For outdoor, fixed installation with IP65/IP43 front/rear ingress protection, the VL-12 in Toshiba's Vista-Light series is a 12mm LED screen module producing 6000 nits brightness and a viewing angle of 160 degrees horizontal and 60 degrees vertical. Using discrete Nichia LEDs in a 1R, 1B, 1G oval pattern, the unit has an average power consumption of 240W and 685W maximum. The VL-12 unit is 31.5in. high, 47.24in. wide, and 5.51in. deep with an operating temperature range from –4 degrees to 122 degrees Fahrenheit. It weighs 158lbs., and it can be assembled into videowall displays from 56.78in. to 1574.8in. diagonal. With 16-bit processing and a 1440Hz refresh rate, the unit provides a physical resolution of 1600 pixels per square meter, and with its virtual pixel sharing technology, it yields an effective resolution of 6400 pixels per square meter. The Vista-Light series modules are available in indoor/outdoor configurations from 6mm to 15mm in pixel pitch.
The 20mm TL Vision TL-OV20 from Trans-Lux uses a static-scanned 2R/1G/1B pixel arrangement with IP65/IP43 front/rear ingress protection and produces a brightness of 6000 nits with 16-bit processing and a contrast ratio of 1500:1. The unit provides a viewing angle of 140 degrees horizontal and 70 degrees vertical with a pixel density of 2500 per square meter and a 1000Hz refresh rate. The display offers levels of manual dimming and 16 automatic levels while consuming 684W per square meter maximum and 227W per square meter on average. Pixel sharing produces a virtual pixel pitch of 10mm, and the modules can be cabinet mounted in a number of configurations and allow front or rear service access.
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