主動式有機發光顯示面板畫素負載波型分析與研究

The Study and Analysis of the Loading Waveform of the Active-Matrix Organic Light-Emitting Displays

陳星臣(Sing-Chen Chen)

指導教授 ： 楊恆隆

國立臺北科技大學/電資學院/光電工程系研究所/碩士(2008年)

https://doi.org/10.6841/NTUT.2008.00597

摘要

此論文主要探討AMOLED完整系統的穩態負載電流、OLED畫素跨壓、驅動電流、負載功率的波型分析。畫素電路是由2個電晶體和1個電容所構成，掃描及資料電路是由複雜可程式邏輯元件數位晶片加上數位類比轉換IC，建構2×2主動式有機發光顯示面板系統。各波型的FFT分析結果可知相較於純電阻的理想負載而言，OLED畫素負載電流訊號波形有明顯高次諧波產生，也就意味著在時間軸上波峰與波谷有其它電流產生。OLED畫素負載電流在低頻308Hz時為0mA~0.6mA，理想負載電流1.6mA~4mA，而在高頻1262Hz時OLED畫素負載電流為0mA~0.5mA，理想負載電流1.3mA~4mA。在低頻時，OLED負載實功率等於總功率，虛功率為總功率的0.28倍。在高頻時，OLED負載實功率為總功率的1.76倍，虛功率為總功率的2.35倍。從FFT的分析可看出OLED畫素負載電流與OLED功率的高次諧波項次皆多於理想負載，代表OLED負載電流與功率雜訊大於理想負載，且OLED負載高頻雜訊大於低頻。

關鍵字

主動式有機發光顯示面板 ； 畫素驅動電流波型 ； 快速傅立葉轉換 ； 複雜可程式邏輯元件

並列摘要

This thesis research is to investigate and analyze steady-state waveforms of loading current, voltage across an OLED pixel, driving current, as well as power-loading in an experimental AMOLED system. The pixel circuitry is composed of 2 transistors and 1 storage capacitor. The experimental 2×2 AMOLED system consists of a CPLD as scan/data driver and digital/analog converter. The FFT analysis of OLED loading current signals revealed the existence of higher-order harmonic waves compared to that of pure-resistance loading current signals. The magnitudes of OLED and pure-resistance loading currents are 0mA~0.6mA and 1.6mA~4mA respectively at lower frequency 308Hz. The magnitudes of OLED and pure-resistance loading currents are 0mA~0.5mA and 1.3mA~4mA respectively at higher frequency 1262Hz. The real power of OLED loading equals the total power at lower frequency. The ratio of virtual power to total power is 0.28 at lower frequency. The real power of OLED loading is 1.76 times greater than the total power at higher frequency. The virtual power of OLED loading is 2.35 times greater than the total power at higher frequency.

並列關鍵字

Active-Matrix Organic Light-Emitting Displays ； Waveform of pixel driving current ； Fast Fourier Transform ； Complex Programmable Logic Device

參考文獻

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