一种改善旋转LED屏亮度显示的算法研究
2020-05-21郭帅张弛吴晓光刘念
郭帅 张弛 吴晓光 刘念



摘 要:旋转LED显示屏的旋转特性导致了其靠近中心区域的亮度整体偏高,靠近边缘区域的亮度整体偏低,有效的校正这种屏幕的亮度不一致性是提升该类型屏幕的显示效果的有效手段。文章针对旋转LED显示屏上的这种缺陷,提出一种基于PWM调节原理的旋转LED显示屏的亮度校正算法。与未进行校正算法校正之前相比,文章利用该算法校正了单位面积内LED灯的光度,降低了整体屏幕的亮度不一致性。实验表明:文章算法的校正效果良好,校正速度快,有效地提高了屏幕亮度一致性。
关键词:旋转;LED屏幕;光度调节;PWM技术
中图分类号:TN141.9 文献标志码:A 文章编号:2095-2945(2020)15-0007-03
Abstract: The rotating characteristics of a rotating LED display screen cause its overall brightness near the center to be high, and its brightness near the edge to be low. Effectively correcting the brightness inconsistency of this screen is effective to improve the display effect of this type of screen means. Aiming at such defects in rotating LED display screens, this paper proposes a brightness correction algorithm for rotating LED display screens based on the principle of PWM adjustment. Compared with the correction algorithm before correction, this paper uses this algorithm to correct the luminosity of LED lights per unit area, reducing the brightness inconsistency of the overall screen. Experiments show that the algorithm in this paper has good correction effect, fast correction speed, and effectively improves the consistency of screen brightness.
Keywords: rotation; LED display screen; photometric adjustment; PWM technology
1 概述
隨着控制技术的高速发展,对LED的控制研究越来越深入,一种基于旋转式线阵LED的显示屏的概念被提出并得以实现。旋转LED显示屏作为一款新型显示屏,其利用POV原理,通过旋转LED灯条实现了裸眼即可观看到3D视频的效果,常用做裸眼3D显示屏。[1]其旋转特性导致了旋转LED显示屏的亮度不一致性,越靠近旋转中心,亮度越高,该现象对于图像的显示很不利。因此,针对旋转LED屏的亮度均匀性的研究是很有必要的。
传统LED显示屏中对各灯点的亮度修正方式是采用检测与校正两个步骤去改善亮度均匀性。[2]文献[3]运用数字图像处理技术对显示屏上每个灯点的亮度进行检测与提取计算出各个灯点的校正系数并运用脉冲宽度调制PWM方法调节相应灯点的亮度,该方法适用于静态LED灯的亮度调节,但是未考虑旋转运动过程中每个LED灯发光区域大小不一致的问题。……
