Based on the needs of TCO members, TCO 95 approval is aimed at promoting technical development which allows professional employees continuously to improve their professional skills, says Dr Kjell Fransson of TCO Development Unit. He stresses the global nature of TCO 95, requiring that the approved product and its production process meet the same standards regardless of where the product is manufactured or sold. The specific criteria that PC equipment must satisfy to qualify for TCO 95 approval are based on TCO members accumulated knowledge and working life experience. As far as the display is concerned, the demands and expectations of the professional PC user centre on the quality and adjustability of the picture. The picture must be sharp and undistorted across the screen.
Defects make themselves felt as undue strain on the eyes.
TCO 95 standards for the quality of the display image are mainly based on the ISO 9241 international standard. Some of the requirements are tighter than the corresponding ISO requirements. All the Nokia displays of the new family to which the Nokia 447Za belongs have both ISO 9241 and TCO'95 approval. The standards define a testable minimum level for the ergonomic visual qualities of the display image. The image is free of flicker if the display s refresh rate is sufficiently high.