Browse > Article

Dual Modulation Driving for Poly-Si TFT Active Matrix OLED Displays  

김재근 (수원대학교 전자공학과)
정주영 (수원대학교 전자공학과)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.41, no.10, 2004 , pp. 17-22 More about this Journal
Abstract
We developed a new ANGLED display driving method which used both amplitude and pulse width modulation. For pulse width modulation, we divided a picture frame time into S sub-frames. For amplitude modulation, we used three OLED luminance(or current) levels which were controlled by TFT's gate voltages. By combining these two modulation methods, we obtained 35(=243) grey levels. And we designed a new data electrode driving circuit block with two shift registers without using DAC's. To verify the feasibility, we simulated the key circuit components by HSpice with TFT parameters extracted from current-voltage characteristics of 6${\mu}{\textrm}{m}$ channel length polysilicon TFT's. From the simulation results, we found that 320${\times}$240, dual scan, 243 grey level AMOLED display can be designed with this method.
Keywords
AMOLED; TFT; Half-luminance; Full-liminance; Gray levels; Sub-frame;
Citations & Related Records
연도 인용수 순위
  • Reference
1 C. W. Tang, 'An overview of organic electrolu-minescent materials and devices,' SID 96 Digest, pp.181-184(1996)
2 M. Stewart et al., 'Polysilicon VGA active matrix OLED displays-technology and performance,' 1998 IEDM Teeh. Digest, pp.871-874(1998)   DOI
3 R.M.A. Dawson et al., 'Design of an improved pixel for a polysilicon active-matrix Organic LED display,' SID'98 Digest, pp.11-14 (1998)
4 K. Inukai et al., '4.0-in TIT-OLED displays and a novel digital driving method,' SID 00 Digest, pp.924-927 (2000)
5 R.M.A. Dawson et al., U.S. Pat. 6,307,322 (2001)
6 '5V 100MHz low-temperature poly-Si TFT shift register,' NEC Res. & Develop., vol. 42, no. 1, pp. 84 (2001)