Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Implementation of Optimal Flicker Free Display Controller for LED Display System

LED 디스플레이 시스템을 위한 최적의 플리커 프리 디스플레이 제어장치 구현

  • Lee, Juyeon (J_LITECH) ;
  • Kim, Daesoon (Department of Digital Electronics & Information, VISION University College of Jeonju) ;
  • Lee, Jongha (Department of Digital Electronics & Information, VISION University College of Jeonju)
  • 이주연 (제이라이텍) ;
  • 김대순 (전주비전대학교 디지털전자정보과) ;
  • 이종하 (전주비전대학교 디지털전자정보과)
  • Received : 2016.11.29
  • Accepted : 2017.05.16
  • Published : 2017.06.25
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Abstract

In this paper, we developed an optimal flicker-free control algorithm operating within 16 luminance implementation bits and 512 brightness implementation pulses irrespective of LPM(LED Pixel Matrix) module configuration on dynamic driving method of LED display system. As an implementation method, we turned the refresh rate up by increasing the number of scans through multiple shift-latches which were devised from conventional shift-latch scheme for full color representation. As a result, the LED display system of this method has no flicker phenomenon because of the novel refresh rate higher than 2,040[Hz] incomparable to 240~480[Hz] of conventional system.

본 논문에서는 LED 디스플레이 시스템의 동적인 구동방식에서 LPM 모듈의 구성에 관계없이 휘도구현 비트를 16비트 이내, 휘도 구현 펄스를 512개 이내에서 최적의 플리커 프리 제어 알고리즘을 개발하고 이 알고리즘을 이용하여 디스플레이 제어장치를 구현하였다. 구현방법으로는 완전한 색 표현을 위한 기존의 시프트-래치 방법을 변형하여 여러 번의 시프트-래치를 수행하게 하여 스캔횟수를 늘림으로써 리플레시율을 증가시키는 방법을 사용하였다. 그 결과로 기존의 LED 디스플레이 시스템은 리플레시율이 240~480[Hz]를 수행하지만 제안된 방법을 사용하면 리플레시율을 2,040[Hz] 이상으로 높게 구현할 수 있기 때문에 플리커 현상을 감지할 수 없게 된다.

Keywords

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