May 23, 2012 2:20 PM, By Mark Johnson
LED BACKLIGHT TECHNOLOGY
The other implementation is with LEDs as the light source for LCD displays. Here, LEDs are used instead of cold cathode fluorescent CCFL backlighting. Some of the advantages presented by LED backlighting include a thinner panel, brighter display, and increased contrast, along with lower power consumption and more efficient heat dissipation. The LCD (TFT-Thin Film Transistor) technology remains the same whether the backlighting is LED or CCFL.
There are a few different implementations of LED backlighting: Edge-lit LEDs provide the ability for displays to be very thin. A special panel allows the light from the LEDs to diffuse evenly over the screen area. Full-array LED backlighting has the LEDs situated behind the full screen area. Local dimming provides for dimming or brightening of individual zones of LEDs, affording better black levels and uniformity. Local dimming is more commonplace on full-array designs, though there are a few manufacturers that have applied local dimming to edge-lit models as well.
Apple ’s 27in. Thunderbolt display incorporates a Thunderbolt port, three USB 2.0 ports, a FireWire 800 port and Gigabit Ethernet port, and features two channels of bi-directional 10Gbps throughput. The LED backlit display offers a 16:9 aspect ratio and 2560x1440 resolution and a 178-degree viewing angle. Also included is a built-in speaker system with subwoofer and FaceTime HD camera and microphone.
Asus’ VS series backlit LED monitors are available in four models with 1920x1080 HD resolution. The display sizes range form 21.5in. to 24in. and feature an internal power adapter.
The EW2730 from BenQ is a 27in. monitor with 1920x1080 resolution. The display features Vertical Alignment (VA) LED liquid crystal display technology for improved contrast and 8-bit color range and BenQ’s Senseye Human Vision Technology presets for image optimization. Input connectors include D-sub, DVI-D, two HDMI plus audio line in and out, and a headphone jack. The viewing angle is 178-degrees horizontal and vertical. The EW2730 is Window 7 compatible.
The Dell P2412H full HD monitor features a 24in. backlit LED screen. Menu rotation software allows the screen to be used in either landscape or portrait orientation. Connectivity includes DVI-D, VGA, and USB (one USB 2.0 upstream and two USB 2.0 downstream) ports.
The HP 2311gt 23in. LED Backlit 3D monitor comes with passive polarized glasses for 3D viewing and also includes Film Patterned Retarder (FPR) technology to transfer 2D media to 3D. The monitor features full HD resolution, VGA, DVI-D, HDMI and HDCP inputs, and Energy Star compliance.
JVC’s DT-E21L4 is a 21in. full HD monitor that comes with HDMI and HD-SDI interfaces and is designed for professional applications including postproduction and broadcasting. The monitor also features and embedded 16-channel audio level meter and a built-in IMD (in-monitor display) that indicates the monitor identifier as text and include tally lamps.
NEC offers the 46in. X461S and the 55in. X551S LED edge-lit displays that feature 1920x1080 FHD native resolution. The displays support Intel’s Open Pluggable Specification (OPS) standardization of option slots and also include DisplayPort, HDMI, DVI-D, 15-pin D-sub, and BNC composite inputs. Both displays meet Energy Star 5.1 guidelines and feature a carbon footprint meter that calculates and tracks carbon savings.
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