硅基OLED数字型像素驱动电路MOS管尺寸对数据写入的影响

以传统的6T SRAM(5T+1MOS驱动管)结构硅基OLED像素电路为例，分析了开关管尺寸对数据写入的影响。提出了一种新型数字型硅基OLED像素电路，用5T(4T+1MOS驱动管)实现与6T SRAM(5T+1MOS驱动管)结构相同的功能。另外新型的像素电路与传统的SRAM结构相比，其数据写入不受开关管尺寸的影响，可以采用最小尺寸的开关管。基于SMIC 0.18 μm 1.8 V/5 V混合信号工艺设计，通过仿真得出6T SRAM结构像素电路能正常写入的开关管最小尺寸为540 nm/600 nm，像素单元版图面积为4.3 μm×4.3 μm；新型5T结构像素电路中的开关管尺寸可以为工艺最小尺寸，即300 nm/600 nm，版图面积为3.91 μm×3.91 μm，相比之下单个像素单元版图面积缩小了17.3%。

Abstract

The traditional 6T SRAM (5T and a driving MOS transistor) OLED-on-silicon pixel circuit is taken as an example to analyze the influence of switch size on data writing. A novel digital OLED-on-silicon pixel circuit is proposed, which uses 5T (4T and a driving MOS transistor) to achieve the same function as 6T SRAM (5T and a driving MOS transistor). In addition, compared with the traditional SRAM structure, the data writing of the new pixel circuit is not affected by the switch size, and the smallest switch size can be used. Based on SMIC 0.18 μm 1.8 V/5 V mixed signal process design, the simulation results show that the minimum size of the switch in 6T SRAM pixel circuit is 540 nm/600 nm, and the pixel unit layout area is 4.3 μm × 4.3 μm. The switch in new 5T pixel circuit can be the minimum size of the process, that is, 300 nm / 600 nm, and the layout area is 3.91 μm × 3.91 μm. In contrast, the area of a single pixel unit layout is reduced by 17.3%.

参考文献

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徐勇, 祁鹏赫, 黄苒, 赵博华, 刘梦新. 硅基OLED数字型像素驱动电路MOS管尺寸对数据写入的影响[J]. 液晶与显示, 2021, 36(5): 680. XU Yong, QI Peng-he, HUANG Ran, ZHAO Bo-hua, LIU Meng-xin. Influence of MOS transistor size on data writing in digital driving pixel circuit of OLED-on-silicon[J]. Chinese Journal of Liquid Crystals and Displays, 2021, 36(5): 680.

硅基OLED数字型像素驱动电路MOS管尺寸对数据写入的影响

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