用脉冲宽度调制驱动的三色发光二极管器件再现透镜彩色滤光片的色效应

T. Freitas, Antônio Maia, Meinhard Sesselmann, Maria Brasil
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摘要

视觉应激(Visual Stress, VS)是一种由于光适应能力不平衡而导致阅读障碍的视觉异常状况。它在1983年首次被描述,从那时起,一直使用彩色光谱滤光片进行治疗,要么作为Irlen覆盖,要么作为透镜来缓解症状。然而,覆盖的有限选择损害了对患者最佳滤镜的追求,因此可以提供更广泛颜色范围的设备将提高筛查人员和患者的成就。目前的工作旨在开发一种微控制RGB LED器件,其目标是通过彩色光计重现Irlen叠加组合色度。这种设备可以为筛查者提供比常规覆盖层和眼镜更广泛的颜色范围,从而为更好地诊断视觉压力(VS)提供可能性,因此,可以更准确地检查患者的最佳色点。为了实现这一目标,构建了基于电流脉宽调制(PWM)的LED控制器,并开发了一种色彩再现方法来确保色度匹配。在考虑的47个过滤器中,有22个显示比率ΔE/JND < 6,因此,放置在可以提供与其相应过滤器相关的读取性能的范围内。再现方法是有效的,需要5个主要输入:LED个体和白点颜色坐标加上LED表征曲线。事实证明,该控制器可以有效地在设备的色域内进行色彩操作,如果发现色度随患者年龄的变化而变化,则可以重新调整色度,并进一步连接眼动仪以缩短寻找最佳点的时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Chromatic Effect Reproduction of Irlen Colored Filters by a Pulse Width Modulation-Driven Three-Chromatic Light Emitting Diode Device
Visual Stress (VS) is an abnormal visuoperceptual condition caused by an imbalance in light adaptation ability which yields reading deficits. It was first described in 1983 and, since then, has been treated with the usage of colored spectral filters, either as Irlen overlays either as lenses for symptoms relief. However, the limited options of overlays compromise the pursuit for the patient’s optimal filter so that a device that could provide a broader range of colors would improve achievements for both screeners and patients. The present work aims to develop a micro-controlled RGB LED device whose goal is to reproduce Irlen overlays combinations chromaticities through colored light metamers. Such a device can open possibilities for better diagnosing Visual Stress (VS) by providing screeners a much more extensive range of colors than regular overlays and glasses and, therefore, allowing more accurate scrutiny of the optimal chromatic point for the patient. For the pursuit of this goal, a LED controller based on PWM (Pulse Width Modulation) of currents was built, and a color reproduction methodology was developed to ensure chromaticity matching. From the 47 filters considered, 22 showed a ratio ΔE/JND < 6 and, thus, laid within a range that could provide the reading performance associated with its corresponding filter. Reproduction methodology was effective and demanded 5 main inputs: LED individual and white point color coordinates plus LED characterization curves. The controller proved to be effective for color manipulation inside the device’s gamut, which opens the possibility for both readjustment of the chromaticity, if it is found to vary with patient’s aging, and further connection to an eye tracker to shorten the search for the optimal point.
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