被動式有機發光二極體顯示器之行驅動電路設計

The Column Driver Circuit Design for Passive Organic Electroluminescence Display

曾郁潔(Yu-Chieh Tseng)

指導教授 ： 鍾文耀

中原大學/工學院/電子工程研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500672

摘要

本論文以實現有機發光顯示器之行驅動電路為研究主題，討論其中關鍵性的類比電路方塊，並且以面板的精確電流輸出為目的，嘗試設計相關的電路。論文中詳細記錄整個系統設計流程、電路工作原理與電路模擬結果。
在系統設計方面，藉由相關文獻的研讀與各廠家規格書的內容比較，詳細研析需開發的IC應具備的機制，然後提出設計考量。本論文所設計之系統，其電路主體是由八位元的二階矩陣平面區塊的相等加權數位類比轉換器設計為亮度控制功能，灰階電流產生電路，完成六位元的數位訊號對63階的類比灰階電流轉換。此外，利用切換電流式技術使輸出電流更加精準。在輸入亮度電流1uA時，切換取樣精確度近似於-0.005%。動態模擬輸入訊號頻率1kHz時SNDR可達51.6dB。
為了探討切換電流式技術於行-行電路間的電流誤差消除，分別變動標準差大小與亮度電流大小，模擬行電路因距離遠近不同，在不同環境存在參數變異，以30次蒙地卡羅分析方式模擬。在臨界電壓的標準差 時，行與行的匹配程度仍然保持在2%的誤差量以下。所設計之電路皆使用VIS 0.35μm High Voltage 2P4M Polycide 13.5V製程模型完成模擬。

關鍵字

精確電流電路 ； 有機發光二極體顯示器 ； 數位類比轉換器 ； 切換電流式電路

並列摘要

The subject of the thesis is to realize the column driver circuit of OLED, discuss the critical analog circuit block, and try to design those related circuit to get an accurate output current. Besides, the design procedures of the system, principles and simulation results of these circuits are detailed recorded in the thesis.
About the system design, by studying the related papers and comparing with the specifications of other commercial products, we study and analyze the mechanisms and then propose the corresponding designs. In the system, the main unit is a 8 bits Digital-to-Analog converter with two-stage current cell matrix architecture for the function of brightness control. And the gray current generator is to perform a 6 bits digital signal conversion for the current of 63 levels gray. Besides, use switching current to get more accurate output current. When the input brightness current is 1uA, the accuracy rate of switch-hold is about –0.005%. When the frequency of input signal is 1kHz, the SNDR could achieve 51.6dB.
For discussing the performance of the variations elimination between different column circuits of the switch current circuit, we change the standard deviation and the brightness current to simulate to verify if there is any variation of column current due to the different distance. We perform the Monte Carlo simulation for 30 times, and get the current variation in different column is under 2% when the standard deviation of threshold voltage is 0.18. The proposed circuit uses VIS high voltage process（0.35μm, 2P4M, 13.5V）to design and simulate.

並列關鍵字

accurate current design ； OLED ； switched-current ； DAC

參考文獻

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