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The latest in monitor and television display technology

Comparing visual, environmental and ergonomic properties of the modern LCD with a classic CRT display; the LCD comes out as a winner in all aspects except for color range. Last week we have seen the new JVC Xiview monitor, with 96% coverage rate of for Adobe RGB, and at next week's SID Week 2009 the latest developments will be shown. NEC will showcase an LCD that achieves 100% of the AdobeRGB range, and Sharp will exhibit a five-primary-color display that faithfully reproduces the real surface colors that we are capable of perceiving...

PRESS SUMMARY

Key Highlights and Must-Sees at Display Week 2009NEC develops White LED-Based LCD Module

NEC LCD Technologies, and its sales and marketing channel in the Americas, NEC Electronics America, Inc., today announced the development of a new amorphous-silicon color thin-film-transistor (TFT) liquid crystal display (LCD) module that achieves an ultra-wide color gamut for 100 percent of the Adobe®RGB color range by incorporating a newly developed LED light-source unit into the backlight system and a newly developed color filter.

The white LED that serves as the light source for the backlight unit in this LCD module achieves its white light by mixing light generated through the irradiation of red, green, and blue (RGB) phosphors with light from a near-ultraviolet LED chip (excitation), making it superior to traditional white LEDs in terms of color-rendering properties. Combining these newly developed white LEDs with newly developed color filters optimized for this application makes it possible to reproduce a wider range of colors covering 100 percent of the AdobeRGB color range, which is generally beyond the reach of conventional standard white LEDs.

In recent years, there has been an increase in customer demand for LCD displays using white LEDs as light sources in backlight units due to the many benefits achieved with LED backlight systems versus cold-cathode-fluorescent-(CCFLs)-based backlights. Such benefits include smaller module dimensions, lighter-weight designs, and reduced power consumption. The LEDs are also mercury free and do not require the use of high-voltage circuitry, allaying concerns related to safety and the generation of harmonic currents and high-frequency noise. The LEDs offer superior vibration and shock resistance as well as superior characteristics with respect to low-temperature startup and a wider dimming range.

The white LEDs currently in widespread use typically have weaker output in their red and green wavelength components than CCFLs, since they create white light by exciting the yellow phosphors that cover the blue LED chips. For this reason, when used as backlight light sources, traditional white LEDs, even when combined with color filters having a wide color gamut, impose limits on the expansion of the red and green color reproduction range, making it difficult to cover the Adobe®RGB color range.

NEC LCD Technologies overcame these problems with its newly developed LCD module that is compatible with applications requiring an ultra-wide color gamut, a capability difficult to achieve with traditional white LEDs.

The white LED-based LCD module will be showcased in NEC Electronics America's booth (#459) at the Society for Information Display (SID) Display Week 2009 at the Henry B. Gonzalez Convention Center in San Antonio, Texas, June 2-4.


Sharp Develops Five-Primary-Color LCD

Sharp Corporation has developed a five-primary-color display that faithfully reproduces the real surface colors that humans are capable of perceiving. A prototype of this display will be exhibited at the international symposium of the Society for Information Display (SID) to be held in San Antonio, Texas, US from May 31 through June 5, 2009.

Demand for displays that can render colors in a manner faithful to the appearances of naturally occurring surface colors or designed colors is growing stronger in fields such as industrial design, digital archiving, network-based remote medical care, and electronic commerce. Thus various efforts to satisfy these requests are intensifying, prompting, for example, the development of natural vision technology*1.

This five-primary-color display comprises “Multi-Primary-Color Technology” that features special image processing circuitry, in addition to the display panel whose pixel structure is based on five-color filters that add the colors C (cyan) and Y (yellow) to the three colors of R (red), G (green), and B (blue). This combination expands the color gamut (range of reproducible colors) that can be rendered within the color spectrum that humans can discern with the unaided eye, and enables the display to reproduce more than 99% of real surface colors*2. Nearly all real surface colors can be rendered faithfully, including colors that have been difficult to render using conventional LCD monitors—the color of the sea (emerald blue), brass instruments (golden yellow), and roses (crimson red), for example. As adoption of this technology will enable more efficient use of light energy produced by the backlight, this display will also provide greater energy savings.

In the future, Sharp will be working to further improve the basic performance of this display and making efforts toward its practical application.

Additional information: Key Highlights and Must-Sees at Display Week 2009
May 31, 2009
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