Abstract
This study proposes an innovative design method for functional optical film microstructures used in displays and applies this design to LCD backlighting to replace multi-layer optical film functional integration with composite optical film. We design a novel optical film microstructure based on light uniformity and wide-angle lumination distribution and determine the optimal optical microstructure parameters by combining the global optimization of a genetic algorithm with ray tracing. The purpose of this study is to develop substitutes for traditional multi-layer prism brightness enhancers and light-diffusing film stacks and to examine the structural changes during calculations and summarize the characteristics. In this study, we focus on determining the optimal light uniformity of new optical film microstructures. The seven-inch LED backlight module of the method proposed in this study achieved 94.59% uniformity and 168° lumination distribution while reducing thickness by 66% to 82% compared to a traditional multi-layer optical film stack.
Highlights
In recent years, green energy-saving and ultra-thin displays have become the demand for the mainstream market
In 2009, Sang-HoonBaik used the full width at half maximum (FWHM) to define the angular luminance distribution of optical films to determine the size of the view angle [10], which was examined against an orthogonally arranged dual prismatic sheet for performance comparison
We proposed the idea of combining geometric shapes to design new compound function optical microstructures
Summary
Green energy-saving and ultra-thin displays have become the demand for the mainstream market. Multiple optical films with various effects are stacked in layers in backlight modules to focus the light energy and equalize the light distribution. Backlight modules for displays typically comprise brightness enhancing films with prismatic structures to enhance luminance in the normal direction. This approach is likely to cause significant declines in luminance at minor angles away from the normal direction. The aim was to widen the luminance distribution viewing angle and resolve the uneven luminance in the central viewing angles of older structures to achieve one-to-two or one-to-many performances, replace the traditional process of stacking multiple optical films together, reduce the thickness of backlight modules, design an easy-to-manufacture structure, and effectively reduce costs
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