The Research On Driving Technology For OLED-on-Silicon Micro-display

Micro-display technology is rising display technology, and it greatly promotesindustrial product design, reduces the space volume of the display and the powerconsumption of portable products, extends lifetime of the equipment. It has a verywide range of applications in military and civilian industry. Therefore, the study ofmicro-display technology will have a wide range of practical significance andcommercial value.With the development of organic light-emitting technologies in recent years,Organic Light-Emitting Diode on Silicon micro-display begins to become a hotresearch gradually. But the technology is still in the accumulation phase, most of thekey technologies are dominated by developed countries. This dissertation uses theOrganic Light-Emitting Diode on Silicon micro-display driving technology as theresearch object, and studies the pixel driving circuit and scan driving controltechnology, then proposes a practical driving method. The dissertation’s work ismainly in the following aspects:(1) Analyzes the current situation of micro-display technology, and introducesthe Organic Light-Emitting Diode display technology, then uses Matlab for fittingmodel function according to laboratory test data prepared with OLED devices,obtaining fitting parameters and using Verilog-A language to establish OLEDsimulation model, and the simulation model can accurately reflect the V-Icharacteristics of OLED. This method provides a fast, easy way to build OLEDmodel.(2) Analyzes Organic Light-Emitting Diode on Silicon pixel driving circuit fordetail and discusses the voltage and current pixel compensation circuit, and eventuallyuses SRAM circuit as OLED-on-Silicon pixel driving circuit, and designs pixel circuitincluding data memory circuits and voltage driving circuits, giving detailed designsteps of transistor size and simulation data. It determines the size of the pixel cell driving circuit transistor according to stability, speed, area and so on.(3) Introduces the realization principle of existing scanning strategies, anddefines three scan matrixes, then compares and analyzes advantages anddisadvantages of various strategies qualitatively, and uses linear weights bit scanningsubspace partitioning strategy ultimately, and gives specific partitioning schemes andalgorithms to improve the scanning efficiency.(4) Introduces genetic algorithms based on the value of the weight to scan matrixsearch strategy in detail, designs two encodes and penalty function to search high graylevel weights scan matrix, and search out256level weights scan matrix to meet therequirements through experiments.(5) Gives the design of Organic Light-Emitting Diode on Silicon micro-display,including a pixel region, row, column control module and a scan driver module.Developed a silicon chip based on SMIC0.35μm2P4M, the total chip area is26.20mm×21.36mm, micro-display with a resolution of1024×1280×3, the gray levelof256. Test results show that the emission luminance can meet the requirements ofdirect viewing of human eyes basically.