Design method for area-efficient and uniform channel DACs

A current-mode driving scheme has significant advantages over other competing driving method, and the scheme does not require the time-consuming threshold voltage sampling process used in recent voltage-mode driving methods. Design considerations for compact and uniform channel DACs in current-mode AMOLED display data drivers are addressed in detail. Furthermore, an 8 bit area-efficient cascaded-dividing DAC and a 9 bit segmented DAC are designed in accordance with the suggested DAC design method. The presented DACs perform outstandingly when compared in terms of a composite DAC performance that comprises chip area, power consumption, sampling frequency, and DAC bit resolution.

[1]  Christofer Toumazou,et al.  Regulated Cascade Switched-Current Memory Cell , 1990 .

[2]  Jing Cao,et al.  A 10-bit 1GSample/s DAC in 90nm CMOS for Embedded Applications , 2006, IEEE Custom Integrated Circuits Conference 2006.

[3]  Hiroshi Takahara,et al.  9.4: A Novel Current Programmed Pixel for Active Matrix OLED Displays , 2003 .

[4]  Yonghua Cong,et al.  A 1.5 V 14 b 100 MS/s self-calibrated DAC , 2003, 2003 IEEE International Solid-State Circuits Conference, 2003. Digest of Technical Papers. ISSCC..

[5]  Gyu-Hyeong Cho,et al.  Transient Charge Feedforward Driver for High-Speed Current-Mode Data Driving in Active-Matrix OLED Displays , 2010, IEEE Transactions on Circuits and Systems I: Regular Papers.

[6]  Yong-Min Ha,et al.  41.1: Invited Paper: LTPS Technology for Improving the Uniformity of AMOLEDs , 2007 .

[7]  E.K.F. Lee,et al.  Design of low-power ROM-less direct digital frequency synthesizer using nonlinear digital-to-analog converter , 1999, IEEE J. Solid State Circuits.

[8]  W. Groeneveld,et al.  A self calibration technique for monolithic high-resolution D/A converters , 1989, IEEE International Solid-State Circuits Conference, 1989 ISSCC. Digest of Technical Papers.

[9]  R.J. Bowman,et al.  A 250/spl mu/W 0.042mm2 2MS/s 9b DAC for Liquid Crystal Display Drivers , 2006, 2006 IEEE International Solid State Circuits Conference - Digest of Technical Papers.

[10]  Gyu-Hyeong Cho,et al.  A cascaded-dividing current DAC with fine pitch for high-resolution AMOLED display drivers , 2007 .

[11]  Tae Jin Kim,et al.  A Current Driver IC using a S/H for QVGA FullColor Active-Matrix Organic LED Mobile Displays , 2006, 2006 IEEE International Solid State Circuits Conference - Digest of Technical Papers.

[12]  Yannis Tsividis,et al.  Current copier cells , 1988 .

[13]  Yong-Joon Jeon,et al.  Improved Transient Current Feedforward Output Buffer for Fast and Compact Active-Matrix OLED Column Drivers , 2009, IEEE Transactions on Circuits and Systems II: Express Briefs.

[14]  W. Sansen,et al.  A 10-bit 1-GSample/s Nyquist current-steering CMOS D/A converter , 2001, Proceedings of the IEEE 2000 Custom Integrated Circuits Conference (Cat. No.00CH37044).

[15]  M.J.M. Pelgrom,et al.  Matching properties of MOS transistors , 1989 .

[16]  Dong-Hun Lee,et al.  A Compact Low-Power CDAC Architecture for Mobile TFT-LCD Driver ICs , 2008, 2008 IEEE International Solid-State Circuits Conference - Digest of Technical Papers.

[17]  K. Bult,et al.  A 10-b, 500-MSample/s CMOS DAC in 0.6 mm2 , 1998, IEEE J. Solid State Circuits.

[18]  Reiji Hattori,et al.  P-43: Single DAC Current Delivery System for Driving AMOLED Panel with Increased Pixel Uniformity , 2005 .

[19]  S. Pearson,et al.  The impact of the transient response of organic light emitting diodes on the design of active matrix OLED displays , 1998, International Electron Devices Meeting 1998. Technical Digest (Cat. No.98CH36217).

[20]  Oh-Kyong Kwon,et al.  P‐11: An Improved Voltage Programmed Pixel Structure for Large Size and High Resolution AM‐OLED Displays , 2004 .