硅基OLED微显示的数模融合驱动电路设计

Design of digital analog hybrid driving circuit for OLED-on-silicon microdisplay

当前,硅基OLED(organic light-emitting diode,OLED)微显示器正向高分辨率、高刷新频率方向发展。为了实现像素面积微小型化、降低扫描数据流量从而更好满足高分辨率、高刷新率的要求,提出了一种新型的有源矩阵硅基微显示驱动电路结构。该电路采用数模融合的扫描策略,该策略结合了数字脉宽调制方式和模拟幅值调制方式;设计了多列像素复用列驱动通道的结构,满足数模融合扫描方式的时序要求。最后通过对列驱动单元后仿真,得到关键时序参数,结合数模融合扫描策略确定了几个具体结构方案。在保证红绿蓝三色像素尺寸在10μm以下的情况下,与单纯的数字扫描策略相比,每秒数据流量降低了25%~64%。结果表明:基于数模融合扫描策略的硅基OLED微显示驱动电路在保证像素面积微小型化基础上,降低了扫描数据流量,有利于高分辨率高刷新率的显示。

The OLED-on-silicon microdisplay with high resolution and high refresh frequency is required in future applications.A novel active matrix OLED-on-silicon microdisplay driver architecture is proposed to reduce the pixel area and the data throughput to meet the new requirements.The proposed architecture adopts the digital-analog-hybrid scan strategy,which combines the digital pulse width modulation method and the analog amplitude modulation method.The multi-column multiplexing column drive channel is designed to meet the timing requirements.The critical timing parameters are obtained through the simulation of the column driving units.Several circuit structure schemes are compared by combining the digital-analog-hybrid scan strategy.The data throughput decreases 25%to 64% per second compared with the simple digital scanning strategy with the pixel pitch below 10μm.The results show that the OLED-on-silicon microdisplay driver circuit based on digital-analoghybrid scan strategy can reduce the scanning data throughput and help to realize the high resolutionand high refresh rate OLED microdisplay.