Electroluminescent Light-emitting Device Drive Circuit

Organic Light Emitting device is a new display device; it is the hottest research subject in display field recently. This dissertation focuses on the driving circuit of OLED (Organic Light Emitting Device).First we introduce the emitting theory and the structure of OLED, and then we introduce the photo electricity characteristic of OLED, analyze the driving requirement. we expounded the characteristic between current driving method and voltage driving method, AC driving method and DC driving method, passive driving method and active driving method。Through theory research we find the DC driving method is also suitable for OLED driving。An AC-Voltage driving circuit is proposed and designed. We test the characteristic of OLED under AC-Voltage driving; meanwhile we investigate the characteristic of OLED under AC-Voltage driving and DC-Voltage driving. The relevant test and research show that the AC-driving circuit functions excellently, realizing AC driving and restraining the cross talk, and the lifetime of OLED can be improved greatly. We also find the luminance efficiency of OLED under AC-Voltage driving is lower than DC-Voltage driving. In the study of OLED performance under AC-Voltage driving, we also found the performance of OLED is largely impacted by driving frequency and duty ratio, the frequency around 50Hz and duty ratio around 50% is most fit for OLED.The other key point of this paper is the driving circuit for OLED. With the aid of the design thoughts of other flat panel displays, A control circuit is designed firstly, which can be applied on small scale of OLED, and does a hardware implementation based on programmable logic device. The simulation result is gotten by using software, and a hardware implementation is done by CPLD. The control circuits which we designed could realize control logic。The circuits which have simple structure could be easily integrated and applied on Passive-Matrix OLED by the aid of AC driving circuit which we have designed. Under simple development, it could be applied on Active-Matrix OLED directly. Finally we design power circuit, through the design of a stable current circuit, we solve the disaffiliate luminance in OLED...