液晶表示素子の表示むらとセルギャップ偏差に関する研究

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The purposes of this study are to understand the relation between brightness uniformity of LCDs and its cell gap deviation caused by flatness of their substrates and to propose a flatness criterion of substrates considering human sensibility to the uniformity. Examinations are performed using periodic linear deviations in brightness uniformity on LCD cell samples. Result of psychophysical test shows that human sensibility to the linear defects depends on a cross gradient for the brightness signal projection to a linear direction. Therefore linear defects in uniformity can be evaluated by the gradient value. To demonstrate correlation between the deviation to brightness uniformity of LCDs and the cell gap deviation caused by flatness deviations of their substrates, some cross sections on LCD cell samples are tested. Brightness deviations are measured by image processing technique and cell gap deviations are calculated from measured surface profiles of their front and rear substrates that were pieces of the cells. Strong similarity between both deviations is observed. From this result it becomes clear that periodic linear deviations to the brigbtness uniformity on LCDs can come from surface corrugation of substrates caused by glass surface or coated layers. Then flatness of substrates can be evaluated according to the human sensibility to the brightness uniformity of LCDs by using gradient value of surface profiles and allowable limits of substrate corrugation can be determined by this experimental process in the same cell production condition.
公益社団法人精密工学会の論文
2001-03-05

液晶表示素子の表示むらとセルギャップ偏差に関する研究

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