一种应用于AMOLED显示驱动芯片的伽马校正电路  

A gamma correction circuit for AMOLED display driver chip

作　　者：宇跃峰 尹勇生[1] 谢熙明 权磊 贾晨 YU Yue-feng;YIN Yong-sheng;XIE Xi-ming;QUAN Lei;JIA Chen(Hefei University of Technology Institute of VLSI Design,IC Design Web-cooperation Research Center of MOE,Hefei 230601,Anhui,China;Research institute of Tsinghua University in Shenzhen,Shenzhen 518057,Guangdong,China)

机构地区：[1]合肥工业大学微电子设计研究所教育部IC设计网上合作研究中心,安徽合肥230601 [2]深圳清华大学研究院,广东深圳518057

出　　处：《微电子学与计算机》2021年第2期34-39,共6页Microelectronics & Computer

基　　金：国家自然科学基金(61704043);中央高校基本科研业务费专项资金(JD2016JGPY0003);深圳市科创委技术攻关项目(JSGG20170413153845042)。

摘　　要：基于UMC80nm工艺,本文采用非线性数据变换结合线性DAC的结构,设计了一种应用于1080 p分辨率AMOLED显示驱动的伽马校正电路.其中,非线性变换电路采用分段线性拟合的方法设计;DAC位宽设计为11 bit,采用“6+5”两级结构;第一级为阻值相等的电阻串组成的6 bit二进制加权DAC,第二级DAC设计为class-AB输出的插值运放结构,不仅作为11 bit DAC一部分,还用于驱动R、G、B像素电路,节省了芯片面积.对电路进行Spectre仿真,非线性数据转换误差为0.77%,11 bit DAC的INL最大为+0.33LSB/-0.51LSB,DNL最大为+0.24LSB/-0.16LSB,整体伽马校正电路的误差为0.96%,满足1080 p分辨率AMOLED驱动芯片的需求,具有一定的应用价值.Based on the UMC80nm process,this paper uses a non-linear data transformation combined with a linear DAC structure to design a gamma correction circuit for 1080 p resolution AMOLED display drive.Among them,the non-linear transformation circuit is designed by piecewise linear fitting method,which is simple and flexible,and easy to implement;in order to meet the high-precision requirements of gray-scale voltage,the DAC bit width is designed to be 11 bit,and the“6+5”two-stage structure is adopted;The stage DAC is designed as a class-AB output interpolation op amp structure,not only as part of the 11 bit DAC,but also used to drive R,G,B pixel circuits,saving chip area.Spectre simulation of the circuit,the non-linear data conversion error is 0.77%,the maximum INL of the 11 bit DAC is+0.33LSB/-0.51LSB,the maximum DNL is+0.24LSB/-0.16LSB,and the error of the overall gamma correction circuit is 0.96%,Meeting the needs of AMOLED driver chips with 1080 p resolution,which has certain application value.

关 键 词：伽马校正 非线性数据处理 高精度DAC 插值运放 

分 类 号：TN432[电子电信—微电子学与固体电子学]