High-resolution LCDs with large work information area are required for PC and monitor applications.However, the high resolution leads to finer lines and smaller size in characters. In order to investigaterelationship between LCD resolution and character readability, the authors performed an ergonomic evaluation of character readability using a 15-inch XGA TFT-LCD (86ppi) and UXGA TFT-LCD (133ppi) . The results indicated that the 15-inch UXGA offered superior readability. Additionally, we were able to find some factors affecting character readability, including the balance of character size and stroke width.