The amount of images produced to be viewed as soft copies on output displays are significantly increasing. This
growing occurs at the expense of the images targeted to hard copy versions on paper or any other physical support. Even
in the case of high quality hard copy production, people working in professional imaging uses different displays in
selecting, editing, processing and showing images, from laptop screen to specialized high end displays. Then, the quality
performance of these devices is crucial in the chain of decisions to be taken in image production. Metrics of this quality
performance can help in the equipment acquisition. Different metrics and methods have been described to determine the
quality performance of CRT and LCD computer displays in clinical area. One of most important metrics in this field is
the device spatial frequency response obtained measuring the modulation transfer function (MTF). This work presents a
comparison between the MTF of three different LCD displays, Apple MacBook Pro 15", Apple LED Cinema Display
24" and Apple iPhone4, measured by the white noise stimulus method, over vertical and horizontal directions.
Additionally, different displays show particular pixels structure pattern. In order to identify this pixel structure, a set of
high magnification images is taken from each display to be related with the respective vertical and horizontal MTF.