A gamma correction circuit for AMOLED display driver chip

YU Yue-feng; YIN Yong-sheng; XIE Xi-ming; QUAN Lei; JIA Chen

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A gamma correction circuit for AMOLED display driver chip

更新时间：2026-09-04

- A gamma correction circuit for AMOLED display driver chip
- Vol. 38, Issue 2, Pages: 34-39(2021)
- 作者机构：
  
  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机构,广东,深圳,518057
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2021
- 稿件说明：
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宇跃峰, 尹勇生, 谢熙明, 权磊, 贾晨. 一种应用于AMOLED显示驱动芯片的伽马校正电路[J]. 微电子学与计算机, 2021, 38(2): 34-39.

YU Yue-feng, YIN Yong-sheng, XIE Xi-ming, et al. A gamma correction circuit for AMOLED display driver chip[J]. 2021, 38(2): 34-39.
宇跃峰, 尹勇生, 谢熙明, 权磊, 贾晨. 一种应用于AMOLED显示驱动芯片的伽马校正电路[J]. 微电子学与计算机, 2021, 38(2): 34-39. DOI：

YU Yue-feng, YIN Yong-sheng, XIE Xi-ming, et al. A gamma correction circuit for AMOLED display driver chip[J]. 2021, 38(2): 34-39. DOI：

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.

Abstract

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

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

Keywords

references

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MENG Y, YIN Y S, YU Y F, et al. High precision DAC design for AMOLED source drive[J]. Chinese Journal of Liquid Crystals and Displays, 2019, 34(4): 379-385. DOI: 10.3788/YJYXS20193404.0 379.

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LIU H G, GENG W D, GAO P T, et al. Research of LCoS Gamma Correction Circuit[J]. Semiconductor Optoelectronics, 2009, 30(6): 958-961. DOI: 10.16818/j.issn1001-5868.2009.06.041.

WANG D, GUO G L, JIANG Y, et al. Analysis and design of a rail-to-rail operational amplifier based on chopper technology[J]. Microelectronics % Computer, 2017, 34(10): 97-100. DOI: 10.19304/j.cnki.issn1000-7180.2017.10.020.

JIANG M M. Research on gamma correction of LCD based on FPGA[D]. Nanjing: Nanjing Forestry University, 2016.

HUANG W. Study on a high precision rail-to-rail input and output operational amplifier[D]. Chengdu: University of Electronic Science and Technology of China, 2018.

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