The advantage of positive text-background polarity is due to high display luminance

Reading text from computer screens is better when text is printed in dark letters on light background (positive polarity) than when it is printed in light letters on dark background (negative polarity). An experiment is presented that tests whether this positive polarity advantage is due to the fact that overall display luminance is typically higher for positive than for negative polarity displays. To this end, text-background polarity and display luminance were manipulated independently. No positive polarity advantage was observed when overall display luminance of positive and negative polarity displays was equivalent. There was only an effect of display luminance, with better performance for the higher-luminance displays. This suggests that the positive polarity advantage is in fact due to the typically higher luminance of positive polarity displays. Readability of text presented on computer screens (e.g. on websites) is better when the overall display luminance level is high, as in positive polarity displays (dark letters on light background). Display polarity per se does not affect readability.

[1]  An-Hsiang Wang,et al.  Effects of VDT leading-display design on visual performance of users in handling static and dynamic display information dual-tasks , 2003 .

[2]  Edgar Erdfelder,et al.  A short tutorial of GPower , 2007 .

[3]  An-Hsiang Wang,et al.  Effects of polarity and luminance contrast on visual performance and VDT display quality , 2000 .

[4]  S Saito,et al.  How display polarity and lighting conditions affect the pupil size of VDT operators. , 1990, Ergonomics.

[5]  W. Cushman.  Reading from Microfiche, a VDT, and the Printed Page: Subjective Fatigue and Performance , 1986, Human factors.

[6]  Jacob Cohen.  Statistical Power Analysis for the Behavioral Sciences , 1969, The SAGE Encyclopedia of Research Design.

[7]  Stephen E. Newstead,et al.  Efforts of display format on proof-reading with VDUs , 1988 .

[8]  S. Pastoor,et al.  Legibility and Subjective Preference for Color Combinations in Text , 1990, Human factors.

[9]  Hsi-Hao Chung,et al.  Contrast‐ratio analysis of sunlight‐readable color LCDs for outdoor applications , 2003 .

[10]  Gordon E. Legge,et al.  Psychophysics of reading—V. The role of contrast in normal vision , 1987, Vision Research.

[11]  Paul van Schaik,et al.  The effect of text and background colour on visual search of Web pages , 2002 .

[12]  Chin-Chiuan Lin.  Effects of screen luminance combination and text color on visual performance with TFT-LCD , 2005 .

[13]  A. Sockloff,et al.  Statistical power analysis for the behavioral sciences: (revised edition), by Jacob Cohen. New York: Academic Press, 1977, xv + 474 pp., $24.50. , 1978 .

[14]  Alan H. S. Chan,et al.  Effect of display factors on Chinese reading times, comprehension scores and preferences , 2005, Behav. Inf. Technol..

[15]  Chin-Chiuan Lin,et al.  Effects of ambient illumination and screen luminance combination on character identification performance of desktop TFT-LCD monitors , 2006 .

[16]  An-Hsiang Wang,et al.  Effects of bending curvature and text/background color-combinations of e-paper on subjects' visual performance and subjective preferences under various ambient illuminance conditions , 2007, Displays.

[17]  V Barnes,et al.  Reading Is Slower from CRT Displays than from Paper: Attempts to Isolate a Single-Variable Explanation , 1987, Human factors.

[18]  A. Buchner,et al.  Text – background polarity affects performance irrespective of ambient illumination and colour contrast , 2007, Ergonomics.

[19]  G. Legge,et al.  Psychophysics of reading—I. Normal vision , 1985, Vision Research.

[20]  Kong-King Shieh,et al.  Effects of reflection and polarity on LCD viewing distance , 2000 .

[21]  E. Grandjean,et al.  Ergonomic aspects of visual display terminals , 1980 .

[22]  Richard H. Hall,et al.  The impact of web page text-background colour combinations on readability, retention, aesthetics and behavioural intention , 2004, Behav. Inf. Technol..

[23]  Knut Nordby,et al.  Time course of contrast adaptation to VDU-displayed text , 1992 .

[24]  Kong-King Shieh,et al.  Effect of character size and lighting on legibility of electronic papers , 2008, Displays.

[25]  Edgar Erdfelder,et al.  G*Power 3: A flexible statistical power analysis program for the social, behavioral, and biomedical sciences , 2007, Behavior research methods.