Generation of diffuser dot patterns for light guides using fuzzy scheme strategy

Abstract

We propose a fuzzy scheme strategy for the generation of the diffuser dot patterns in the light guide of an edge-lit backlight. The fuzzy scheme strategy is based on fuzzy logic and rules, which are closely related to the physical luminance properties of the light guide. During the process of generating diffuser dot patterns, two inputs are the dot radius and the distance from dots to a light source, and one output is the luminance of the light guide panel. This strategy converts the linguistic strategy based on expert knowledge the optimal dot-generation strategy. Furthermore, this study includes the discussion of fuzzification and defuzzification strategies, the derivation of fuzzy logic rules, and the analysis of fuzzy reasoning mechanisms. Experiment results reveal that the proposed strategy can achieve an even luminance condition by establishing dot patterns. Compared to conventional methods, the fuzzy scheme strategy has two advantages. It effectively integrates the dot generation scheme into the subsequent optical design phase to make dot patterns more efficient and easy to control. Moreover, optimized dot patterns realize sufficient luminance uniformity.

An Iterative Method for the Uniformity Improvement of Edge-Lit Backlight

“…However, the dot patterns generated by this method are randomly distributed on the bottom surface of the LGP; such dot patterns are difficult to manufacture. Zhao et al [10] developed a fuzzy scheme strategy to generate dot patterns for light guide plate. However, this method includes fuzzification and defuzzification strategies, and it is somewhat complex when compared with other methods.…”