SEMI D33 - Measuring Method of Optical Characteristics for Backlight Unit -

This Standard was technically approved by the Flat Panel Display Global Technical Committee. This edition was approved for publication by the global Audits and Reviews Subcommittee on April 28, 2003. Available at www.semi.org in July 2003.

NOTICE: This Standard or Safety Guideline has an Inactive Status because the conditions to maintain Current Status have not been met. Inactive Standards or Safety Guidelines are available from SEMI and continue to be valid for use.

The electro optical characteristics of backlight unit (BLU) have a great influence on the characteristics of LCD like uniformity, luminance and chromaticity etc. There are many measurement methods for BLU of electro optical characteristics. It is so different that the measurement method for BLU in each company (e.g., the testing position, test condition, equipment concept etc.). Therefore, this Standard will present the general measurement method.

This Standard is applicable to BLU for liquid crystal display (LCD) and the measurement includes only the optical area. The other areas (electric characteristics, reliability, and so forth) are dealt with by other SEMI Standards.