Novel Impulsive Driving Schemes for 120Hz LCD Panels

  • Nam, Hyoung-Sik (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD. Member, KIDS) ;
  • Oh, Jae-Ho (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD. Member, KIDS) ;
  • Shin, Byung-Hyuk (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD. Member, KIDS) ;
  • Oh, Kwan-Young (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD. Member, KIDS) ;
  • Berkeley, Brian H. (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD.) ;
  • Kim, Nam-Deog (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD. Member, KIDS) ;
  • Kim, Sang-Soo (LCD Technology Center, LCD Business, SAMSUNG ELECTRONICS CO., LTD. Member, KIDS)
  • Published : 2008.03.31

Abstract

Two new impulsive driving technologies for 120Hz liquid crystal display (LCD) panels are proposed to improve moving picture quality. One technology generates the dark frame using an adder and a shifter simply without using any look up tables (LUTs). It results in a cost effective impulsive scheme with motion picture quality comparable to that of high speed driving. The other is a backlight flashing method designed to avoid ghost images. The issue of ghost images caused by the slow response time of liquid crystal (LC) is solved by means of 120Hz overdriving and 120Hz backlight flashing. Using the perceived blur edge time (PBET) metric, measured moving picture response time (MPRT) values were 10.8ms and 4.4ms, respectively, while that of 120Hz high speed driving was 10.1ms.

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