New FPD Standard – Test Method for Measuring the Spatial Contrast Ratio of FPD

New FPD Standard – Test Method for Measuring the Spatial Contrast Ratio of FPD

By Natalie Shim, SEMI Korea

For several decades in the FPD industry, metrics such as contrast ratio and contrast modulation have been widely used to quantify contrast performance, and sequential test patterning was one of the most popular methods to measure contrast ratio.

However, the sequential full screen test pattern does not give consistent results for the new display technologies that dynamically adjust gray levels based on image contents. In addition, they do not fully consider the real situation of display image contents.

The Korea Spatial Contrast Ratio Task Force, formed in late 2009, has been worked on this issue for the past year and a half.  Now, they have successfully developed their first standard, “Test method for measuring the spatial contrast ratio of Flat Panel Display”, which will be published as SEMI D64-0811 in August, 2011.

The benefit of this new standard is better reliability in assessing the display device in terms of contrast ratio by using the spatial test pattern.  This shows the maximum and minimum luminance area on the same screen at the same time. Consequently, a new metrology including the test pattern which is considered the average picture level can help to evaluate the contrast ratio with the objective way to all types of display technologies.

For more information, please contact Natalie Shim (eshim@semi.org )