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Wednesday, July 20, 2005
NEC Presents High-End LCD with LED Backlight Technology


NEC Display Solutions has announced the launch of the SpectraView Reference 21 (SpectraView LCD2180 WideGamut LED), a 21.3-inch LCD monitor with LED backlight technology.

Equipped with a colour calibration system for accurate colour matching, NEC Display Solutions has taken the next step in display technology.

Recent technology advances in digital image acquisition, colour-processing systems, colour printers and other photographic I/O devices have been remarkable. As well as ever-higher resolutions, the range and depth of colour reproduction has also shown significant improvements. A standardised colour space promises the benefit of consistent colour reproduction across all digital platforms and devices (the so-called colour workflow) from the point of acquisition to the point of delivery. Accurate colour consistency in large colour spaces is required for professional users from the DTP and colour-proofing areas, as well as for the use of specialist devices for image processing and industrial 4-colour printers. These requirements are now fulfilled by the introduction to the market of the NEC SpectraView Reference 21.

In recent years, LCD technology has become the dominant force in the display market due to the excellent performance in picture quality and ergonomics, reduced energy needs, space saving and low cost of ownership benefits. New developments mean that LCD monitors can now be used for wide colour space applications, which have historically been the domain of CRTs.

Technical Specifications of the NEC SpectraView Reference 21

The basis for the SpectraView Reference 21 is the Super Advanced Super Fine Technology (SA-SFT) Dual-IPS panel and LED backlight technology. The technical challenge has been to develop display technology that covers more than 100% of the Adobe RGB colour space and ensures absolute colour accuracy in all areas of colour processing on the monitor. The principle of operation of a traditional LCD screen is based on placing a bright white-light source (typically a mercury-filled fluorescent tube) behind a series of colour matrix LC filters. The LCD filter matrices are controlled digitally to provide fine adjustment of the light throughput and therefore generate a grayscale image retrieving its colour due to the colour filters in front of the LCD. The backlight determines the colour temperature and colour space available, which has typically been approx 72% of the NTSC colour space (CRT monitors achieve around 84% NTSC).

The innovative RGB LED backlight, consisting of red, green and blue LEDs (Light Emitting Diodes), generates white light allowing a wider range of spectral colours to be displayed. More than 100% of the Adobe RGB and NTSC colour space can now be reproduced with an LCD monitor. On top of this, the LED backlight allows for accurate adjustment of the white point between 5000K and 9300K without loss of brightness, as the LCD layer does not change the white colour temperature as in the case of LCD's with conventional CCFL backlighting. The LED backlight itself is capable of changing its white point by varying the ratio of the red, green and blue mixture. A feedback sensor ensures that the display operates consistently with a pre-defined performance.

As a result of this feedback system, the monitor does not need a warm-up phase, but displays stable colours after just a minute. The new mercury-free LED backlight system and the optimised colour filters of the LCD generate an enhanced colour space allowing a wider range of spectral colours to be displayed. The Adobe RGB colour space can be more than covered and therefore consistently reproduced. This innovative solution has been developed by NEC Display Solutions in close co-operation with professionals from the colour processing industry.

With the NEC SpectraView Reference 21, NEC Display Solutions provides the optimum solution for demanding users in the colour management sector with a very wide colour space, a screen diagonal of 21.3 inches and a high resolution of 1600 x 1200 pixels. In addition, a high-accuracy internal feedback system for colour calibration has been integrated to control colour temperature and brightness. The backlight system achieves a delta-E of below 1 within less than one minute. The NEC SpectraView Reference 21 is equipped with a Dual-Domain S-IPS panel, the Super Advanced Super Fine Technology (SA-SFT) panel produced by NEC LCD Technologies, which provides high-speed response times and ultra-wide viewing angles with less colour shift.

The integrated 10-bit gamma table allows an accurate gamma correction function - one each for red, green and blue - for optimum hardware calibration. 1,021 tonal values per colour mean that gradation adjustment is much more precise. Even the most subtle tonal value gradations and grayscales are displayed with extraordinary precision and clarity, which enables the highest quality of colour accuracy to be achieved. Also integrated into the NEC SpectraView Reference 21 is the ColourComp function, a colour uniformity correction improving the Delta-E (colour uniformity variances), which is already improved in the factory by profile validation. These measurement results are interpolated to correct the colour uniformity of each of the 1600x1200 pixels. This correction function is uploaded to the hardware of each monitor.

Hardware calibration without compromises

The SpectraView Profiler software supplied with the unit allows the brightness and the white point to be calibrated, creating the ICC profiles.

Included with each monitor is the light shield, secured by magnetic strips, the SpectraView Profiler software, digital cable and the SpectraView Certifier certification document with the proven and tested performance characteristics recorded for each individual unit during final inspection.


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