【作者】 郑大勇；

【导师】 刘式墉；

【作者基本信息】 吉林大学 ， 微电子学与固体电子学， 2006， 硕士

【摘要】 有机发光显示器(OLED)因其具有超薄、主动发光、高亮度、高对比度、宽视角、宽工作温度范围、低功耗、低成本、全固态等优点,成为当今光电显示领域的研究焦点和热点之一。按照驱动方式的不同,OLED可分为无源驱动(Passive Matrix,PM)和有源驱动(Active Matrix,AM)。AMOLED的驱动技术,正处于各国竞相发展的阶段。虽然如此,但是针对显示数字视频图像的驱动技术还不多见。鉴于此,本文通过对AMOLED显示驱动技术以及DVI接口技术的深入研究,设计了分辨率为96×3×128的基于DVI接口的AMOLED显示屏的外围驱动电路系统,具体的工作有:1、通过对DVI接口以及其解码芯片的研究与分析,设计了需要送往FPGA的控制时序和数据信号,以及送达FPGA前数据的缓存方案。2、对分辨率为96×3×128的AMOLED进行研究,分析其工作原理,建立了产生显示屏所需的各种控制信号和数据信号的算法模型。确定了各控制信号的幅值以及相互之间的时序逻辑关系,以及根据AMOLED显示特性的要求,得到其驱动数据电压的幅度范围;3、分析研究当前的平板显示器的常用驱动方法,根据所研究的AMOLED的特性和结构,提出针对本设计的灰度产生办法和驱动电路系统结构;4、利用现场可编程逻辑门阵列(FPGA)的优越特性,设计了一种分辨率为96×3×128的AMOLED的可编程专用集成电路外围驱动芯片,并对设计的芯片进行Verilog仿真验证。5、设计完成分辨率为96×3×128的AMOLED显示屏的整体外围驱动电路系统。更多还原

【Abstract】 In modern information society, the display devices play an important role.CRT (cathode ray tube) display has been existed more than 100 years and isfacing the strong challenge from FPD (flat-panel display). LCD (liquid-crystaldisplay) is the dominant FPD technology. Presently, OLED (organiclight-emitting device) display is recognized that it is the most developmentaldisplay technology of next generation by this field, and it become one of thestudy focus and hotspot in the field of photoelectricity display today. Due to highbrightness, high contrast(100:1), full colour, wide visual angle(largest angle to170°), fast response time, high efficiency, low-voltage driving etc, OLED isregarded as the most strongly challenger of LCD. So the peripheral drivingsystem and driving chip is an important and integrant OLED technology. In ageneral way,OLED display according to type of drive classify twain genera:passive type(passive matrix,namely PM-OLED)and active type(active matrix,namely AM-OLED). A 96×3×128 resolution AMOLED has been designed inthis paper. The display’s lead lines include 18 analog voltage data and 14 rowand column control signals. Some power signals are also needed.Many driving IC is designed for the PMOLED currently. There is few ofdriving IC which is designed to drive the AMOLED. And the most of them drivethe displays that display some words, numbers and simple pictures or cartoons.But this can’t be satisfied with the expectation to OLED display for people;theyhope they can enjoy the vivid digital video image on the OLED display. Thus theengineer hope to regard the computer that affords digital video image as one ofdata source, make it play synchronously on the OLED display. In order to attainsuch effect, the data transmission from computer to OLED display is veryimportant, DVI interface provides us very large advantage as a new generation ofdigital transmission interface, it has many advantages such as far transmissiondistance, wide data bandwidth and hot plug detection etc. Thus this paperdesigned a chip of driving circuit that can drive the coloured AM-OLED display.The target of this paper is using EDA tools to realize the driving system for the96×3×128 resolution AMOLED display. The system can offer the AMOLEDthe right data and control signals.1. Universal Project of the driving systemTo realize required functions of this study, the project design is shown infigure1. The FPGA controller gets the display data from the DVI interface byway of SRAM. The data are processed in the FPGA. After enlarging its bits andDAC processing, the data are sent to the AMOLED pixels. The FPGA controller,which is droved by a global clock, will generate the row and line driving signals.These signals must be transformed by DC-DC chip and analog switch chip, sotheir wave shape and meet the use of AMOLED.Figure 1 AMOLED driving system project designThe paper’s stress is the design of the outer driving system, which includethe digital circuit portion and the analog circuit portion.The digital portion include FPGA controller, DVI data register (SRAM),Configuration device etc.FPGA controller is the core of the whole design, it offer the OLED displaydata and control signals referencing the control strategy. At the same time, FPGAcan do the data processing work. The OLED display data from DVI interface arestored in the DVI data register. Configuration device match the type of FPGA,the configuration data of FPGA are storied in the configuration device. Whenpowered, FPGA read the configuration data from the configuration device andstore it to its SRAM inherent and begin to have the function as designed.The analog portion includes the DAC module and the voltage convertermodule. The DAC chip translate the digital data output by FPGA into analogvoltage data and transfer them to the OLED pixels. And by the effort of DC-DCconverter and analog switch, the required control signals which have the rightshape and voltage are generated.2. Main work of the design(1) Through the study and research to DVI interface and decoding chip, attainthe controlling logic and data signal, and the memory project of data beforebeing sent FPGA.(2) Studying the 96×3×128 resolution AMOLED, analyzed its work principle,built the arithmetic model about all kinds of controlling and data signal thatdisplay needs, confirmed the value of controlling signal and its logic eachother, attained the range of the driving data voltage value based on therequest of AMOLED display processing characteristic.(3) Analyzing the common driving method of the plane display today, based onthe characteristic and configuration of the researching AMOLED, offered themethod of gray-scale generation and the system structure of driving circuit.(4) Designed a kind of peripheral driving circuit integrate chip using the superiorcharacteristic, and attained right simulation result by doing much Verilogsimulation to this chip.(5) Completed the whole peripheral driving circuit system of 96×3×128resolution AMOLED display, offered a kind of feasible project for theperipheral driving technology of AMOLED.In this paper we have studied the AMOLED technology and DVI interface.We have designed a peripheral driving system for the 96×3×128 resolutioncoloured AMOLED display based on DVI interface. We have tested the FPGAcontroller by doing much Verilog simulation. We also have designed andanalyzed the hardware system and have gotten the right control signals anddisplay data stream. And our design has met the needs of the 96×3×128resolution AMOLED display.更多还原