标准白场仪及视角测量方法的研究

Standard white field instrument for measuring viewing angle

针对目前主流彩色电视与平板显示器,建立了能够溯源到国家光谱辐射度、光度与色度基准的标准白场仪装置,可用于显示器光色特性参数测量。对该装置进行了定标,提供了标准白场仪光谱、稳定性以及光色参数。应用该标准装置对主流的液晶显示器进行了视角研究,主要考虑了测量过程中所忽略的被测发光面积因素对视角特性的影响。结果表明,基于绝对亮度的视角阈值方法,差别可达8%以上,是测量过程中需要考虑和避免的。

The standard white field instrument traceable to the national spectral radiometric,photometric and colorimetric primary standard was set up for characterizing the photometric and colorimetric parameters of displays.The instrument was calibrated and its spectrum,stability and photometric-colorimetric parameters were given.Using the instrument to study the viewing angle of prevail liquid crystal displays,the influence of the variation of the light-emitting surface during the measurement process was considered,which was usually ignored.The results indicate a difference of more than 8% for the absolute-luminance-based viewing-angle threshold method,which should be considered and avoided in the measurement.