Novel Method for Viewing Angle Evaluation based on Color Difference

• Main Authors: Yan-yu Lin, 林晏羽
• Other Authors: Chou-hua Wen
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/03294884335250233432

碩士 === 國立臺灣科技大學 === 色彩與照明科技研究所 === 101 === The advance in display technology has lead the satisfaction for display image quality become higher and higher. The criteria for evaluating viewing angles, contrast ratio > 10:1, has not been updated since 1980. Therefore, many researchers, industrial manufacturers and standard organizations have attempted to formulate a novel evaluation metric. However, from previous researches on viewing angles, many subjective image quality evaluations revealed that insufficient correlation with optical measurements. The aim of this study is to discover the relationship between human visual perception and viewing angle of the novel displays. In experiments, three most popular types of large panel display for TV applications were selected. Seven different viewing angles were evaluated based upon the most frequently used viewing angles in daily life. Meanwhile, here proposed themetric of Total Quality of Color Viewing Angle (TQCVA) that offered a convenient and subjective measurement to evaluate the viewing angle ranges. The metric was devised and verified through the results of performing subjective evaluations. There are three major advantages of this new computation model are listed as follows. First,the method can analyze color difference, luminance difference and hue difference of displays at varied fixation viewing angles separately. Second, the pooled difference energy stands for the quality of each viewing angle can be calculated in real time. Final, this computation model is suitable for different types of display technologies. TQCVA defines a more stringent requirement for color quality of displays, and overcomes the quality rank issues for different display panel types as well. This new metric can offer the display makers a new computation formula which uses current metrology and equipment of viewing angles in display industry. TQCVA can categorize of the viewing angle ranges for all panel types, and assist display makers in improving the color image quality. In addition, a single or specific index of the viewing angle range is necessary for end-users to make decision during purchasing TVs in store. The proposed metric has served the purpose of measuring viewing angel ranges and the quality management of processes in the production line. It is expected that the metric can avoid the confusion when customers choose a TV display among different technologies, and advance the development of display industry as well.