Research On Driving And Contorlling Of Flexible Panels

Flexible display，a new display device，is thin and flexible，with the advantages ofsmall size, resistance to crack down and low power consumption. The study of thisdisplay is based on the problems existing on flat panel display, such as large size,limitations of application places and high power power dissipation, all of which can notsatisfy increasingly compact demand for electronic products.As the key link of display technology,driving and controlling determines the theentire display performance. For different display device, the driver circuit is differentfrom each other. Currently,there are OLED, LCD and electrophoretic displays can beused in flexible display. In this paper, driver technology for polymer dispersed liquidcrystal PDLC flexible display is researched.As one of the liquid crystal material displaymode,it is a better choice to achieve flexible display, because it does not requirepolarizers and exists in the form of a solid film, and because of its simple preparationprocess. However, different from ordinary liquid crystal displays, PDLC driving voltageis high and current IC can not meet its requirement.Based on the principle of dot matrix LCD driver, a passive matrix driving&controlling scheme for PDLC flexible screen is designed, which use average voltagemethod to inhibit crosstalk and AC driving mechanism to avoid material aging. And forits high driving voltage characteristics, a switching circuit using transistors is build toachieve power conversion from the scanning signal to the bias signal. The hardwarecircuit includes MCU controlling and bias circuit module, as well as the driving circuitmodule of ranks; The software design is divided into two parts, generation of rowscanning and the AC driving signal M and the establishment of the column data, i.e.glyph signal. Such bias signals according to the ranks timing signals is sent to the drivingelectrode.Finally, according the scheme, corresponding PCB circuit board is drawn andassembled, then, the output results of each module are recorded and analyzed when V0is50V. Experimental results show that: the the waveform of sequential logic part is more ideal and consistent with the software simulation waveforms. The six bias signals isprovided by the paired switching circuit, the waveform of which has good switchescharacteristics. The output waveforms of driving electrodes match logic control signals inaddition to unrelated interference sharp pulse. In the debugging process, addingacceleration capacitor and Schottky diode to the switch circuit, switch time has beenimproved. Filter capacitor is joined into output portion, but the effect of suppressinginterference signals is limited. On the basis of studing existing display devicesdrive&control principle, the design of this system is an exploration for drive&controlmethod of new flexible display, which has a certain significance.