GB/T 2 2181.21 - 2008 focuses on the measurement of Optical inspection parameters of plasma display devices, which belongs to part 2-1 of this series of standards. The standard elaborates the Measuring method of key Optical inspection parameters such as luminance, color gamut, and viewing angle, and clearly specifies the Measurement principle, required equipment, operation process and data processing. Through this standard, the Optical Property data of plasma display devices can be accurately obtained, providing a unified and reliable basis for Product Research & Development, mass inspection and performance evaluation, and effectively promoting the standardization and standardization of Optical inspection parameter measurement in the display device industry.