Element Density and Percent Active Area Design Requirements for Liquid Crystal Displays.

摘要

A study was performed to determine the impact of two important matrix display design variables on tactical target recognition performance. Element density (i.e., the visual angle subtended by individual display resolution elements) and the percent active area on the display surface were experimentally manipulated by adjusting viewing distance from a rear projection screen on which a grid mask was placed. The targets were presented to subjects using zoom imagery at a simulated slant range which initially precluded recognition. As the target size increased, subjects were asked to press a remote projector control button when they were 'virtually certain' of their responses. The results indicate little effect of percent active area (i.e., down to 55%) on target recognition performance for element angular subtense values between 0.75 and 3.0 minutes of arc (corresponding to element densities of from approximately 165 to 40 elements per inch at a 28 inch viewing distance). The effects of element density, however, were large and conformed to expectations derived from the limiting resolution of the visual system.