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Wide Colour Gamuts & Image Quality On Displays

Wide Colour Gamuts & Image Quality On Displays - Wider colour gamuts are driving demand for technologies that increase image quality.

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General Photography

Expanding LCD monitor colour gamuts results in the capacity to reproduce a wider range of colours and more opportunities to check colours or adjusting images on monitor screens. However, as a result, problems such as breakdowns in tonal gradations, variations in chromaticity caused by narrow viewing angles, and screen display irregularities, less conspicuous at color gamuts in the sRGB range, have become more pronounced.

As mentioned before, an LCD panel with a wide colour gamut does not ensure that an LCD monitor offers high image quality but there are a few technologies putting these wider colour gamuts to use and these are listed here: 

First on the list are technologies that increase gradation. The key here is the internal gamma-correction function for multi-level gradation which improves tonal gradations and gaps in hue by improving the gamma curve.

A uniformity-correction function is a technology for reducing display irregularities. The uniformity referred to here refers to colours and brightness (luminance) on screen. An LCD monitor with superior uniformity has low levels of screen luminance irregularities or colour irregularities. High-performance LCD monitors feature systems that measure luminance and chromaticity at each position on screen and correct them internally.

Here is a comparison of monitors with and without uniformity correction. An LCD monitor with uniformity correction (left photo) has more uniform luminance and colour on screen than one lacking uniformity correction (right photo). The two photographs below have been adjusted to equalise levels to emphasise display irregularities. Actual irregularities would be less conspicuous.
uniformity-correction function
In regards to viewing angle, while larger screen sizes generally make it easier to see differences, particularly with products with wide color gamuts, variations in chromaticity can be an issue. For the most part, chromaticity variation due to viewing angle is determined by the technology of the LCD panel, with superior ones showing no variation in colour even when viewed from a moderate angle.

Setting aside the various particulars of LCD panel technologies, these generally include in-plane switching (IPS), vertical alignment (VA), and twisted nematic (TN) panels, listed from smaller to larger chromaticity variation. While TN technology has advanced to the point at which viewing angle characteristics are much improved, a significant gap remains between this technology and VA and IPS technologies. If colour performance and chromaticity variation are important, VA or IPS technology remains the better choice.

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