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[ "解红军(1981-), 男, 黑龙江桦南人, 学士, 工程师, 2004年于哈尔滨理工大学获得学士学位, 主要从事AMOLED显示屏电学补偿技术的研究。E-mail:xiehj01@visionox.com" ]
[ "张小宝(1985-), 男, 江苏省徐州人, 硕士, 经理, 2016年于苏州大学获得硕士学位, 主要从事AMOLED显示技术的研究。E-mail:zhangxb@visionox.com" ]
收稿日期:2018-10-18,
录用日期:2019-3-4,
纸质出版日期:2019-04
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解红军, 张小宝. 一种针对AMOLED器件劣化的电学补偿技术[J]. 液晶与显示, 2019,34(4):335-341.
Hong-jun XIE, Xiao-bao ZHANG. Electronic-compensation technique for improving the degradation of AMOLED devices[J]. Chinese journal of liquid crystals and displays, 2019, 34(4): 335-341.
解红军, 张小宝. 一种针对AMOLED器件劣化的电学补偿技术[J]. 液晶与显示, 2019,34(4):335-341. DOI: 10.3788/YJYXS20193404.0335.
Hong-jun XIE, Xiao-bao ZHANG. Electronic-compensation technique for improving the degradation of AMOLED devices[J]. Chinese journal of liquid crystals and displays, 2019, 34(4): 335-341. DOI: 10.3788/YJYXS20193404.0335.
AMOLED显示屏经过长时间的使用,不可避免地会有OLED器件劣化的问题。同一显示屏内不同位置的像素器件的劣化程度不同,造成显示屏整体亮度下降和显示残像。使用越久、亮度越高的像素,器件劣化就越严重。本文提出一种电学补偿技术,用以改善OLED器件劣化造成的亮度下降和显示残像。采用电学侦测的方法获得各个像素的OLED器件的
V
TH
,将其存储于闪存芯片内,显示时通过查找表找到对应的OLED发光效率,计算得出各个像素的补偿后灰阶值,实现实时补偿的效果。本技术可以使劣化越严重的像素,获得越大的像素电流,从而弥补由于劣化造成的发光效率下降,最终得到理想的像素亮度。使用该方法可以补偿由于OLED劣化造成的亮度下降和显示残像,残像指标JND小于3.1。
After long-term use of AMOLED display
the problem of OLED device degradation will inevitably occur. Sometimes
the rate of degradation may be different in different areas of panel. Thus
the OLED device degradation can cause some issues
such as general decrease of luminance and static image sticking. As usual
the longer pixel is used or the higher luminance for display
the more serious OLED device degradation occurred. In this paper
a new technology to improve OLED device degradation by external electronic-compensation method was proposed. In this solution
the threshold voltage of OLED device in every pixel can be sensed by external voltage detection. And the
V
TH
data
concerning the degradation level of OLED device
can be stored in flash IC. Then
the image data can be calculated pixel-by-pixel according to compensation data stored in flash IC. Finally
new image data
after revised by compensation algorithm
can be send to source driver IC. The degraded pixels can get bigger current. Then
we can get desired pixel luminance. This solution can compensate the luminance decrease and long-term image sticking caused by OLED device degradation. Image sticking feature JND
<
3.1.
皇甫鲁江, 郑灿, 李云飞, 等.一种LTPS-TFT AMOLED像素电路的理论研究[J].液晶与显示, 2017, 32(8):614-621.
HUANGFU L J, ZHENG C, LI Y F, et al . LTPS-TFT threshold voltage compensation pixel circuit for AMOLED[J]. Chinese Journal of Liquid Crystals and Displays, 2017, 32(8):614-621. (in Chinese)
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XIE H J. Display panel optical compensation device, display panel and optical compensation method: CN, CN104064141A[P]. 2014-09-24. (in Chinese)
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JEONG J T, SHINGO K. Pixel and organic light emitting display using the same: CN, CN102314829A[P]. 2012-01-11. (in Chinese)
王宇, 田朝勇, 周刚. AMOLED像素驱动电路参数设计[J].液晶与显示, 2013, 28(4):587-592.
WANG Y, TIAN C Y, ZHOU G. AMOLED pixel driving circuit parameter design[J]. Chinese Journal of Liquid Crystals and Displays, 2013, 28(4):587-592. (in Chinese)
陈峰. OLED驱动芯片设计及其测试验证平台构建[D].上海: 上海大学, 2006.
CHEN F. Design of OLED driver IC and structure of test platform[D]. Shanghai: Shanghai University, 2016. (in Chinese)
李哲源, 金承泰.感测电路及具有该感测电路的有机发光二极管显示装置: 中国, CN105741782A[P].2016-07-06.
LEE C, KIM S. Sensing circuit and organic light emitting diode display including: CN, CN105741782A[P]. 2016-07-06. (in Chinese)
翁梦婷. OLED显示驱动控制电路的设计[D].杭州: 浙江大学, 2016.
WENG M T. Design of OLED display driver control circuit[D]. Hangzhou: Zhejiang University, 2016. (in Chinese)
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