A 1280 x 720 Micro-LED Display Driver with 10-Bit Current-Mode Pulse Width Modulation

Pei Yi Lai Lee, Ya Wen Yang, Sih Han Li, Jian Jhih Sun, Tzu Yi Hung, Chih Wen Lu, Yen Hsiang Fang, Wei Hung Kuo, Li Chun Huang, Guo Dung John Su, Poki Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Micro-light-emitting diode (micro-LED) displays are the most promising next-generation displays that use tiny LEDs acting as pixels [1-2]. Micro-LED displays are considerably brighter than are organic LED displays, which makes micro-LED displays suitable for head-up display (HUD), virtual-reality (VR), and augmented-reality (AR) applications [3]. A mass transfer technology is used to transfer a micro-LED array from epitaxy to a Si substrate. Pulse width modulation (PWM) is generally employed to generate gray levels in these arrays [4]. Micro-LED display drivers with voltage-mode PWM have strong driving ability but poor display uniformity. By contrast, current-mode PWM is a suitable driving method for achieving display uniformity. However, for high-resolution micro-LED displays, a large number of pixels must be connected to the data line, which creates a large capacitive load on the data line. A micro-LED consumes only tens of microamperes of current; thus, designing a display driver that uses a small current to drive a high-resolution and high-frame-rate display with current-mode PWM is challenging. In this paper, a precharge scheme and a pixel circuit with two transistors and one LED (2T1D) are proposed to solve the aforementioned issue. A 1280 \times 720 micro-LED display driver with 10-bit current-mode PWM was designed and fabricated in this study. Furthermore, a micro-LED array was successfully integrated into the designed display driver chip, which verified the feasibility of the designed display driver.

Original languageEnglish
Title of host publicationProceedings - A-SSCC 2021
Subtitle of host publicationIEEE Asian Solid-State Circuits Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665443500
DOIs
StatePublished - Nov 2021
Event2021 IEEE Asian Solid-State Circuits Conference, A-SSCC 2021 - Busan, Korea, Republic of
Duration: 7 Nov 202110 Nov 2021

Publication series

NameProceedings - A-SSCC 2021: IEEE Asian Solid-State Circuits Conference

Conference

Conference2021 IEEE Asian Solid-State Circuits Conference, A-SSCC 2021
Country/TerritoryKorea, Republic of
CityBusan
Period7/11/2110/11/21

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