It is important if you care about our environment and your eyes. TCO-99 are guidelines set forth by the Swedish governments (National Board for Measurement and Testing, MPR) and the Swedish Confederation of Professional Employees (TCO) to regulate emission properties of electrical equipment.
The guidelines cover such things as emissions, ergonomics, resolution, refresh rate, power consumption, and safety to name a few. Every few years TCO updates the requirements for display devices. TCO-99 is the latest standard.
For more information on TCO see the following link
TCO
Most LCD and CRT monitors meet TCO-99 requirments. Most Black color monitors do not. For example: TCO-99 requires manufacturers to use plastics that are recyclable. Most black color plastics are not easily recyclable and do not meet the TCO requirements, thus odds are they will end up in a landfill. Not very good for our environment.
Jim Witkowski
Chief Hardware Engineer
Cornerstone / Monitorsdirect.com