应用于AMOLED源极驱动的高精度DAC设计

孟宇; 尹勇生; 宇跃峰; 邓红辉; 贾晨

doi:10.3788/YJYXS20193404.0379

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应用于AMOLED源极驱动的高精度DAC设计

材料与器件 | 更新时间：2020-07-05

- 应用于AMOLED源极驱动的高精度DAC设计
- High precision DAC design for AMOLED source drive
- 液晶与显示 2019年34卷第4期页码：379-385
- 作者机构：
  
  1.合肥工业大学微电子设计研究所, 安徽合肥 230009
  2.深圳清华大学研究院, 广东深圳 518057
- 作者简介：
  
  [ "孟宇(1994-), 男, 安徽宿州人, 硕士研究生, 2019年于合肥工业大学获得硕士学位, 主要研究方向为模拟集成电路设计和OLED显示驱动。E-mail:18883285803@139.com" ]
  [ "贾晨(1978-), 男, 山西临汾人, 博士, 副研究员, 2009年于清华大学获得博士学位, 主要研究方向包括显示驱动电路芯片设计、电源管理电路和高速串行接口电路等。E-mail:jiachen@tsinghua.edu.cn" ]
- 基金信息：
  
  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);National Natural Science Foundation of China(61704043);Fundamental Research Funds for the Central Universities(JD2016JGPY0003);Technological Breakthrough Project of Shenzhen Science and Technology Innovation Commission(JSGG20170413153845042)
- DOI：10.3788/YJYXS20193404.0379
  中图分类号： TP394.1;TH691.9
- 收稿日期：2018-10-17，
  
  录用日期：2019-1-22，
  
  纸质出版日期：2019-04
- 稿件说明：
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孟宇, 尹勇生, 宇跃峰, 等. 应用于AMOLED源极驱动的高精度DAC设计[J]. 液晶与显示, 2019,34(4):379-385.

Yu MENG, Yong-sheng YIN, Yue-feng YU, et al. High precision DAC design for AMOLED source drive[J]. Chinese journal of liquid crystals and displays, 2019, 34(4): 379-385.
孟宇, 尹勇生, 宇跃峰, 等. 应用于AMOLED源极驱动的高精度DAC设计[J]. 液晶与显示, 2019,34(4):379-385. DOI： 10.3788/YJYXS20193404.0379.

Yu MENG, Yong-sheng YIN, Yue-feng YU, 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/YJYXS20193404.0379.

摘要

针对OLED显示面板更高分辨率、更高精度的需求，本文提出了一种应用于高分辨率AMOLED源极驱动的高精度10 bit DAC结构。设计的DAC由6 bit的GAMMA校正电阻串DAC及4 bit的基于尾电流源插值的输出缓冲器级联构成，达到高精度的同时占用较小的芯片面积。为进一步提高AMOLED驱动的灰阶电压精度，增加了一个DAC斜率可编程单元对线性DAC输出曲线进行进一步调节，以更好地拟合AMOLED显示屏所需的灰阶-电压曲线，此外，输出缓冲器采用尾电流源插值的方法来实现高精度的第二级DAC。在UMC 80 nm CMOS工艺下，仿真结果表明设计的DAC的最大INL和DNL分别为0.47 LSB、0.24 LSB。在10 kΩ电阻及30 pF电容负载下，DAC电压从最低灰阶到最高灰阶的建立时间为3.38

s。驱动电路可以快速、精确地将图像数据转换为建立在像素电路上的电压，满足分辨率为1080×2 160驱动芯片的应用需求。

Abstract

The paper proposes a high-precision 10-bit DAC structure for high resolution AMOLED source drive for higher resolution and higher precision of OLED display panel.The DAC consists of a 6-bit GAMMA correction resistor-string DAC and a 4-bit output buffer based on interpolation of the tail current

achieve high precision while occupying a small chip area.In order to further improve the gray-voltage precision of AMOLED drive

a DAC slope programmable unit is added to further adjust the linear DAC output curve to better fit the gray-voltage curve required by AMOLED display. In addition

the output buffer adopts the interpolation method of tail current to realize the high-precision sub-DAC. The simulation results under UMC 80 nm CMOS process show that the proposed DAC with INL and DNL of 0.47 LSB and 0.24 LSB

respectively. The settling time of DAC voltage from the lowest gray-scale to the highest gray-scale is 3.38

s with a 10 kΩ resistance and 30 pF capacitance load. The drive circuit can quickly and accurately convert the image data to the voltage established on the pixel circuit

it can satisfy the application requirements of drive chip with resolution of 1 080×2 160.

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references

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