基于遗传算法的场堆叠硅基OLED微显示器伽玛校正研究  

Research on Gamma Correction of Field-stacked Silicon-based OLED Micro-displays Based on Genetic Algorithm

作　　者：陈宝良 季渊[1,2] 黄忻杰 刘俊恺 CHEN Baoliang;JI Yuan;HUANG Xinjie;LIU Junkai(Microelectronics Research and Development Center,Shanghai University,Shanghai 200444,China;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;LUMICORE(shanghai)Co.,Ltd.,Shanghai 200072,China)

机构地区：[1]上海大学微电子研究与开发中心,上海200444 [2]上海大学机电工程与自动化学院,上海200444 [3]昀光微电子(上海)有限公司,上海200072

出　　处：《光子学报》2024年第8期194-207,共14页Acta Photonica Sinica

基　　金：国家自然科学基金(Nos.61674100,61774101)。

摘　　要：硅基有机发光二极管(OLED)微显示器的驱动方式主要分为数字驱动和模拟驱动。在数字驱动中,OLED器件的等效电容导致开启过程中产生亮度脉冲,特别是在场堆叠驱动方式中,固定小数子场的开关过程带来的亮度脉冲直接影响显示的亮度,导致灰阶曲线呈现出非线性递增,这为Gamma校正带来了挑战。为改善Gamma校正的过程及其结果,基于场堆叠数字驱动提出了一个新型亮度模型。该模型结合场顺序、场权值、Vcom电压值和Vcom电压配置,组成一个综合的参数空间。基于该模型,运用遗传算法对灰阶曲线进行了优化,并在分辨率为2560×2560×3的全彩硅基OLED微显示器上进行了实验验证。实验结果表明,通过优化参数空间,白色光灰阶曲线的均根方差和无效灰度点数从21.65 cd/m^(2)、15395个降至1.62 cd/m^(2)、2977个,得到显著改善。这一改进不仅使灰阶曲线更加线性和单调,还有效减少了无效灰度点,成功地实现了白色光Gamma 2.2曲线的精确校正。相比于模拟驱动,场堆叠数字驱动在低灰阶显示上展现出更佳的区分度,更符合人眼对显示效果的感知。In the context of the emerging and evolving concept of the Metaverse,the technology of Virtual Reality(VR)has incrementally unveiled its substantial importance.Within this particular domain,microdisplays,functioning as a pivotal interface bridging the virtual world with the tangible reality,have assumed an immensely crucial role.Silicon-based OLED micro-displays,in particular,distinguished by their attributes of high resolution,superior contrast,and exceptionally vivid colors,have emerged as cornerstone products in the arena of next-generation micro-display technologies.The operational methodologies for these silicon-based OLED micro-displays are primarily bifurcated into two types:digital driving and analog driving.Digital driving,acclaimed for its prompt response and elevated contrast levels,has been extensively embraced in the industry.This specific mode of operation predominantly utilizes the technique known as Pulse Width Modulation(PWM),a method employed to generate an array of distinct grayscale levels.This is achieved by meticulously adjusting the proportional duration of pixel activation and deactivation.Within the diverse landscape of PWM methodologies,the technique of field-stacked driving is particularly noteworthy.This method ingeniously orchestrates fields with varying weights in a meticulously structured sequence,effectively diminishing the instantaneous bandwidth while proficiently representing diverse levels of grayscale.Nevertheless,one can not overlook the significance of the brightness pulses that are generated by the equivalent capacitive characteristics of OLED devices during their activation phase.In the scenario of field-stacked driving,the brightness pulses emanating from fixed fractional subfields that undergo on-off transitions have a direct and profound impact on the displayed brightness,consequently leading to a nonlinear escalation in the grayscale curve.This issue predominantly manifests in two forms:the nonlinearity of the grayscale curve itself,and a paradoxical decrease in bright

关 键 词：GAMMA校正 遗传算法 硅基OLED微显示器 场堆叠数字驱动 灰阶曲线 OLED等效模型 视觉建模 

分 类 号：TN27[电子电信—物理电子学]