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The Passive Oled256 Gray Level Sub-field Control Technology Program

Posted on:2006-08-08Degree:MasterType:Thesis
Country:ChinaCandidate:X FanFull Text:PDF
GTID:2208360152497350Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
After the LCDs(liquid crystal dispays)'success, the OLEDs(organic light-emitting diodes) have become the new research focus in the information display field, especially in the flat-panel display field. As a kind of implement of the information display, the OLEDs have many advantages, for example, they can be made into ultra-lightweight flat-panel displays, and they can emit photons by themselves that means the displaying images are very vivid and vigorous. In addition the unique physical properties of organic thin films allow for flexible, conformable, or foldable display which are unobtainable with conventional, inorganic semiconductor technologies. And the driving voltage is not high, it means the OLEDs can be used on the portable devices. So many famous universities and companies all over the world are engaged in the study of this field. Today, we can see that the industrialization has started. In our country, many universities, companies ,laboratories and graduate schools are attracted by the OLEDs too, and they have made much progress in this field. But it seems that the most attention is paied to the stuff and the technics. About the driving circuits, they mostly buy the developed especial OLEDs ICs. So we choose the study project. In this paper, we put forward a method to realize gray-scale on OLED panel based on sub-frame technique. We divide the display time up in the rate 1:2:4:8…with the Field Programmable Gate Array(FPGA) and design the column driving module with FPGA. To sum up, we do the study on the principles of realizing the gray-scale display in information display, then analyse and compare the methods in existence to realize gray-scale on OLED panel. After that, we choose the method based on sub-frame technique. In this way a new driving circuit system has been designed, which is achieved by FPGA devices. FPGA is an efficient and flexible device for designing all kinds of digital circuit. The display controlling circuit and the column's driving circuit are designed by using the Aletera 's MAX+PLUSⅡand QuartusⅡ. Finally, the simulation results for 160×128(3RGBs)matrixs to achieve 256-grade of gray-scale on OLED panel can be obtained by FPGA devices easily. The system based on sub-frame technique is suitable for the PMOLED matrix display.
Keywords/Search Tags:OLED, Gray-scale, FPGA, Driving-Circuit
PDF Full Text Request
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