tailieunhanh - Organic Light Emitting Diode Material Process and Devices Part 10

Tham khảo tài liệu 'organic light emitting diode material process and devices part 10', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 216 Organic Light Emitting Diode - Material Process and Devices Fig. 1. The schematic layout of a 2T1C pixel driver for AMOLED backplanes Using a high temperature foil like polyimide PI which can sustain temperature of 260 C allows a process flow very similar to the flow used for a-Si backplanes. On the other hand if a low-temperature low-cost foil such as polyethylenetheraphtalate PET 120 C or polyethylene naphtalate PEN 160 C is used it will necessitate the development of low temperature materials and processes for the backplanes. To produce a highly efficient OLED display at the end of the process the choice for a top emitting OLED on top of the pixel engine as shown in Figure 2 is most favorable to generate a larger emitting surface. In order to electrically isolate the OLED from the pixel engine an interlayer is required. This implements also the necessity to have a connection between the OTFT and the OLED anode. This connection or via hole will have to be generated through the interlayers that protect the OTFT from degrading and ideally without impacting the performance of the OTFT. Fig. 2. Schematic cross section of an AM-OLED stack The OLED pixels red green and blue will be deposited by evaporation using a shadowmask patterning technique to create different colors. Prior to this deposition the Interlayer Processing for Active Matrix Organic Light Emitting Diode OLED Displays 217 anode material has to be deposited and patterned on top of the interlayers. Considering solely performance the most favorable anode material is silver due to its low resistivity and high reflectivity There are several challenges in realizing top emitting OLEDs on organic TFTs which have a long lifetime because of their limited chemical physical and environmental stability. In this chapter we address processing issues for the interlayers and the anode. Another issue will be the adhesion of materials on top of each other. Organic materials generally have a pronounced polarity which .

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