硅基有机发光二极管微显示器的驱动技术研究

发布时间：2019-02-12 10:33

【摘要】：微显示技术是新兴的显示技术，它的出现极大的方便了工业产品的设计，减少了显示器的空间占有体积，降低了便携产品的功耗，延长了设备的使用续航时间，在军用及民用产业中都有着非常广泛的应用。因此，对微型显示技术的研究就有着广泛的现实意义和商业价值。随着有机发光技术的兴起，近几年来硅基有机发光二极管微显示器也开始逐渐成为业内研究的热点，但这项技术目前尚处于积累阶段，各项关键技术大都被发达国家所垄断。本文把硅基有机发光二极管微显示器的驱动技术作为研究对象，对像素驱动电路、扫描驱动控制等技术进行了研究，提出了一套切实可行的驱动方法。论文的工作主要有以下几方面： (1)分析了微显示技术的发展现状，介绍了有机发光二极管显示技术，并根据实验室制备的OLED器件的测试数据，使用Matlab工具进行模型函数的拟合，求得拟合参数并采用Verilog-A语言建立了OLED的仿真模型，经仿真该模型能准确反映OLED的V-I特性。此方法提供了一种快速、简便建立OLED模型的途径。 (2)对硅基有机发光二极管的像素驱动电路进行了详细的分析，讨论了电压型和电流型的像素补偿电路，最终采用静态存储电路作为OLED-on-Silicon像素驱动电路，并设计了包括数据存储电路和电压驱动电路在内的像素电路，给出了详细的晶体管尺寸设计步骤和仿真数据。从稳定性、速度与面积等角度进行了分析，确定了像素单元驱动电路晶体管的尺寸。 (3)介绍了现有的扫描策略的实现原理，定义了三种扫描矩阵，定性地对比分析了各种策略的优点和不足，最终采用线性权值按位扫描子空间划分策略，并给出了具体的划分方案算法，提高了扫描利用率。 (4)详细介绍了基于遗传算法的权值扫描矩阵搜索策略，设计了两种编码方式和罚函数应用于搜索高灰度级的权值扫描矩阵，并通过实验验证可搜索出满足要求的256级权值扫描矩阵。 (5)给出了硅基有机发光二极管微显示器的设计方案，包括像素区域、行、列控制模块以及扫描驱动模块的设计方案。开发了一款基于SMIC0.35μm2P4M工艺下的硅基芯片，芯片总面积为26.20mm×21.36mm，微显示器的分辨率为1024×1280×3、灰度等级为256级。测试结果表明，，其发光亮度可以基本满足人眼直接观看的要求。
[Abstract]:Microdisplay technology is a new display technology, which greatly facilitates the design of industrial products, reduces the volume of display space, reduces the power consumption of portable products, and prolongs the service life of the equipment. It is widely used in military and civil industries. Therefore, the research of micro display technology has a wide range of practical significance and commercial value. With the rise of organic light-emitting technology, silicon based organic light-emitting diode microdisplays have gradually become the focus of research in recent years, but this technology is still in the accumulation stage, and the key technologies are mostly monopolized by developed countries. In this paper, the driving technology of silicon based organic light-emitting diode (OLED) microdisplay is studied. The pixel driving circuit and scanning driving control are studied, and a set of feasible driving methods are proposed. The main work of this paper is as follows: (1) the development status of microdisplay technology is analyzed, the organic light-emitting diode display technology is introduced, and according to the test data of OLED devices prepared in the laboratory, The fitting parameters are obtained by using Matlab tool and the simulation model of OLED is established by using Verilog-A language. The simulation model can accurately reflect the V-I characteristics of OLED. This method provides a fast and simple way to establish OLED model. (2) the pixel driving circuit of silicon based organic light-emitting diode is analyzed in detail, and the pixel compensation circuit of voltage mode and current mode is discussed. Finally, the static storage circuit is used as the OLED-on-Silicon pixel driving circuit. The pixel circuit including data storage circuit and voltage drive circuit is designed, and the detailed design steps of transistor size and simulation data are given. The stability, speed and area of the transistor are analyzed, and the size of the pixel unit driving circuit transistor is determined. (3) the realization principle of the existing scanning strategy is introduced, three scanning matrices are defined, the advantages and disadvantages of these strategies are analyzed qualitatively and qualitatively, and finally, the linear weighted bit-scan subspace partition strategy is adopted. The specific partition algorithm is given to improve the scanning efficiency. (4) the search strategy of weighted scan matrix based on genetic algorithm is introduced in detail, and two encoding methods and penalty function are designed to search the weight scan matrix of high gray level. The 256 order weight scan matrix can be searched by experiment. (5) the design scheme of silicon based organic light emitting diode (OLED) microdisplay is presented, including pixel area, row, column control module and scan drive module. A silicon chip based on SMIC0.35 渭 m2P4M technology is developed. The total area of the chip is 26.20mm 脳 21.36mm, the resolution of microdisplay is 1024 脳 1280 脳 3, and the gray level is 256-level. The test results show that the luminance can basically meet the requirement of direct viewing by human eyes.
【学位授予单位】：上海大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TN873

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