A PDM-Based Digital Driving Technique Using Delta-Sigma ($\Delta \Sigma $ ) Modulation for QVGA Full-Color AMOLED Display Applications

We propose a digital driving technique using pulse-density modulation (PDM) for an active-matrix organic light-emitting diode (AMOLED) to effectively suppress the false image contour in conventional pulsewidth modulation (PWM) while achieving considerably low operating frequency. A compact first-order digital ΔΣ modulator provides the PDM signal to the panel. A 2.2-inch QVGA AMOLED system using the proposed technique shows no false image contour problem while allowing relaxed minimum gate scan time.

[1]  Y. Maekawa,et al.  $V_{T}$ Compensation Circuit for AM OLED Displays Composed of Two TFTs and One Capacitor , 2007, IEEE Transactions on Electron Devices.

[2]  Rae-Hong Park,et al.  Two-stage false contour detection algorithm using re-quantization and directional contrast features and its application to adaptive false contour reduction , 2006, 2006 Digest of Technical Papers International Conference on Consumer Electronics.

[3]  Gerard de Haan,et al.  IC for motion compensated de-interlacing, noise reduction, and picture rate conversion , 1999, 1999 Digest of Technical Papers. International Conference on Consumer Electronics (Cat. No.99CH36277).

[4]  Byong-Deok Choi,et al.  Hybrid 8-bit Digital-to-Analog Converter for Mobile Active Matrix Flat Panel Displays Using Low-Temperature Polycrystalline Silicon Thin Film Transistors , 2007 .

[5]  Jun Koyama,et al.  36.1: 6‐Bit Digital VGA OLED , 2000 .

[6]  S. W-B Tam.  A self-biased TFT-OLED pixel driver circuit , 2002 .

[7]  Sang Uk Lee,et al.  P‐83: Histogram‐Based Subfield LUT Selection for Reducing Dynamic False Contour in PDPs , 2005 .

[8]  J. R. Hughes,et al.  Time and temperature dependence of instability mechanisms in amorphous silicon thin-film transistors , 1989 .

[9]  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).

[10]  Jeffrey P. Spindler,et al.  3.2: Digital Drive with White OLEDs , 2009 .

[11]  Yojiro Matsueda,et al.  New Current Demultiplexer TFT Circuits for AMOLED , 2005, IEICE Trans. Electron..

[12]  Tetsuya Shigeta,et al.  19.4: Improvement of Moving‐Video Image Quality on PDPs by Reducing the Dynamic False Contour , 1998 .

[13]  T. Sasaoka,et al.  24.4L: Late‐News Paper: A 13.0‐inch AM‐OLED Display with Top Emitting Structure and Adaptive Current Mode Programmed Pixel Circuit (TAC) , 2001 .

[14]  Minho Kwon,et al.  A digital driving technique for an 8b QVGA AMOLED display using ΔΣ modulation , 2009, 2009 IEEE International Solid-State Circuits Conference - Digest of Technical Papers.

[15]  Young Hwan Kim,et al.  Image-Dependent Code Optimization to Improve Motion Picture Quality of Plasma Displays , 2006, IEICE Trans. Electron..

[16]  Gyu-Hyeong Cho,et al.  P‐40: A Novel Data Driving Method and Circuits for AMOLED Displays , 2006 .

[17]  Charles M Higgins,et al.  The computational basis of an identified neuronal circuit for elementary motion detection in dipterous insects. , 2004, Visual neuroscience.

[18]  Oh-Kyong Kwon,et al.  Voltage-programming method with transimpedance-feedback technique for threshold voltage and mobility compensations in large-area high-resolution AMOLED displays , 2006 .

[19]  Zuley Rivera-Alvidrez,et al.  Contrast saturation in a neuronally-based model of elementary motion detection , 2005, Neurocomputing.

[20]  Jun Koyama,et al.  36.1:6-Bit Digital VGA OLED(2.内容)(2-1.セッション36:AM-OLEDs and Low-Temperature Polysilicon Technologies)(Society for Information Display 00 Report) , 2000 .

[21]  G. de Haan,et al.  IC for motion-compensated 100 Hz TV with natural-motion movie-mode , 1996 .

[22]  Hajime Akimoto,et al.  32.2: An Innovative Pixel‐Driving Scheme for 64‐Level Gray‐Scale Full‐Color Active Matrix OLED Displays , 2002 .