LCD legibility as a function of resolution

We proposed a new method to evaluate display legibility as a function of re solution. This method was able to evaluated display legibility without bein g restricted to the display resolution. Using this method, subjective psych ological experiments were carried out to investigate display resolution, wh ich provides legibility, in observing small characters. Samples viewed by s ubjects were images displayed on a high-resolution TFT-LCD that we develope d, CRT images and printed documents for comparison. We have found that TFT- LCD legibility was much better than that of CRT, and that minimum resolutio n of about 175 dpi was needed for use in legible document viewers.