4670-PPI OLEDoS pixel circuit design for wide data voltage range in a 5 V 0.13 μm CMOS process

IF 1.7 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Hyeon-Jun Shin, Yong-Duck Kim, Byong-Deok Choi
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引用次数: 0

Abstract

OLEDoS displays hold great promise for AR/VR applications, but the ultra-high pixel density required for microdisplays, exceeding several thousand PPI, presents significant challenges for pixel circuit design. Above all, the maximum OLED current of each OLEDoS sub-pixel is extremely low, on the order of several nanoamperes or less, resulting in a data voltage range narrower than a few hundred millivolts. Consequently, for example, when expressing 10-bit grayscale, designing data driver circuits to divide the data voltage range into 1024 levels becomes exceedingly challenging. Furthermore, circuit techniques that compensate for variations in transistor characteristics are nearly inapplicable due to the ultra-small pixel area. This paper proposes a pixel circuit design method to expand the data voltage range for a 4670-PPI OLEDoS display while considering current uniformity. The effectiveness of the proposed pixel circuit was verified through measurements on 40 × 120 pixel arrays fabricated in a 5 V 0.13 μm CMOS process.

Abstract Image

在 5 V 0.13 μm CMOS 工艺中实现宽数据电压范围的 4670-PPI OLEDoS 像素电路设计
OLEDoS 显示器在 AR/VR 应用中大有可为,但微型显示器所需的超高像素密度(超过数千 PPI)给像素电路设计带来了巨大挑战。最重要的是,每个 OLEDoS 子像素的最大 OLED 电流极低,仅为几纳安或更低,导致数据电压范围小于几百毫伏。因此,例如在表示 10 位灰度时,设计数据驱动电路将数据电压范围划分为 1024 个电平就变得极具挑战性。此外,由于像素面积极小,补偿晶体管特性变化的电路技术几乎不适用。本文提出了一种像素电路设计方法,在考虑电流均匀性的同时,扩大了 4670-PPI OLEDoS 显示屏的数据电压范围。通过对以 5 V 0.13 μm CMOS 工艺制造的 40 × 120 像素阵列进行测量,验证了所提像素电路的有效性。
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来源期刊
Journal of the Society for Information Display
Journal of the Society for Information Display 工程技术-材料科学:综合
CiteScore
4.80
自引率
8.70%
发文量
98
审稿时长
3 months
期刊介绍: The Journal of the Society for Information Display publishes original works dealing with the theory and practice of information display. Coverage includes materials, devices and systems; the underlying chemistry, physics, physiology and psychology; measurement techniques, manufacturing technologies; and all aspects of the interaction between equipment and its users. Review articles are also published in all of these areas. Occasional special issues or sections consist of collections of papers on specific topical areas or collections of full length papers based in part on oral or poster presentations given at SID sponsored conferences.
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