Design of the broadband retarders for 3D display
Date Issued
2010
Date
2010
Author(s)
Chang, Yu-Hsun
Abstract
BBR has been widely applied for LCD display. However, the previous studies did not include rotatable analyzer and the compensated retarder. When the analyzer rotates, the retardation vs. wavelength relationship is failed to represent both the transmittance vs. wavelength property and the color performance.
In this paper, the authors proposed multiple evaluation metrics to measure the image quality. The total luminance ratio, crosstalk and color shift metrics are defined and used to evaluate the image quality. The optimization of broadband retarder shows improvement of 26.17% for white crosstalk, 38.55% for red color shift and 21.1% for green color shift problems.
Then, we use the numerical solution to analyze the performance by varying material, number of layer, structure, and retarder’s angle. For one retarder layer, the crosstalk of white light is less than 0.015 and color-shift of white light is less than 0.014 when viewer’s rotation angle is 90°. For two retarder layers, the crosstalk of white light is less than 0.0007 and color-shift of white light is less than 0.001 when viewer’s rotation angle is 90°. For three retarders layers, the crosstalk and color-shift of white light can be reduced to less than 0.00004 when viewer’s rotation angle is 90°.
Finally, because the previous study is focused on green light, we propose the three color based design method for improving the performance in red and blue light. Comparing with the previous study, the color-shift of three color based design is better. For two retarders layers, the ratio of color shift by using three color based design with respect to the previous study are 11%、82.14% and 12.53% for white, red and blue light. For three retarders layers, the ratio of color shift by using three color based design with respected to the previous study are 9.09% and 13.4% for white and blue light.
Subjects
3D display
polarization
retarder
Type
thesis
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