Difference between revisions of "Display Technology"

Revision as of 01:27, 6 April 2007

Project Documents

• CSE561 Modeling and Simulation Project Preliminary Report (.doc)
• Project Slides presented on 5 March 2007 (.ppt)
• Project document as of 5 March 2007 (.doc)

Paper Search

"LCD power model" search on ACM

Display Technologies

General

• > Qualcomm report on competitive modern display technologies
• Display Technologies for Portable Communication Devices, 2002

Liquid Crystal Displays (LCD)

• Liquid Crystal Display (LCD)
• > LCD background
• > Thin Film Transistor (TFT LCD) Overview (plasma.com)
• TFT on Wikipedia
• Active Matrix LCD

Flexible Displays

Electrophroetic Displays (EPD)

• Electronic paper prototype
• Electrophoretic technology
• (1.21) Comiskey, Albert, Yoshizawa, Jacobson, An electrophoretic ink for all-printed reflective electronic displays, Nature 394, 253-255 (16 July 1998)
• (1.12) Dalisa, Electrophoretic Display Technology, IEEE Transactions on Electron Devices, Vol. ED-24, No. 7, July 1977

Some current characterization for electrophoretic suspension fluid.

• (1.13) Katase, Method and circuit for driving electrophoretic display, electrophoretic display and electronic device using same, U.S. Patent 6961047, 2005
• (1.14) Hopper, Novotny, An Electrophoretic Display, Its Properties, Model, and Addressing, IEEE Transactions on Electron Devices, VOL. ED-26, No. 8, August 1979

Addressing. With a display thickness of 50micrometer and an average dielectric constant of 5.0, the capacitance per element would be ~0.055 pF.

• (1.15) Neyts, Beunis, Schlangen, A 1-Dimensional Simulation Tool for Electophoretic Displays, Fourth FTW PhD Symposium, Ghent University, 2003
• (1.17) Herz, Electrophoretic Display technology: The beginnings, the improvements, and a future in flexible electronics, May 19, 2006
• (1.19) Takao, Miyasaka, Kawai, Hara, Miyazaki, Kodaira, Tam*, Inoue, Shimoda, Flexible Semiconductor Devices: Fingerprint Sensor and Electrophoretic Display on Plastic, IEEE, 2004

EPD driver information and pixel level model

Section 3. To compensate for the leakage current, the storage capacitor must be very large; here, the capacitance is 34 pF. A polysilicon TFT is preferable to an amorphous silicon TFT for the switching transistor, because the large capacitor must be charged during the short pixel selection period.

• (1.20) Inoue, Kawai, Kanbe, Saeki, Shimoda, High-Resolution Microencapsulated Electrophoretic Display (EPD) Driven by Poly-Si TFTs With Four-Level Grayscale, IEEE Transactions, August 2002

EPD driven to produce greyscale

I. ...we have reported the world's first active-matrix EPD at an international electron device meeting (IEDM 2000)[12]. Since then, a few displays combining TFTs and microencapsulated electrophoretic materials have also been introduced [13]-[16].

I. Microencapsulated electrophoretic material in this EPD was driven by poly-Si TFTs fabricated with a low temperature process...

• (1.22) Kim, Lee, Park, Sung, Chin, Choi, Lee, Synthesis and characteristics of microcapsules containing electrophoretic particle suspensions, Springer-Verlag, 11 January 2006
• Tokiwa, Imamura, Electrophoretic Mobility Studies of Colloidal Particles in Aqueous Solutions of Various Phosphates, Journal of the American Oil Chemists' Society, June 1969
• (1.23) Bert, Smet, Beunis, Neyts, Complete electrical and optical simulation of electronic paper, Science Direct, 13 October 2005
• (1.24) Strubbe, Determination of the valency of pigment particles in electrophoretic ink, Ghent University, 30 November 2005

Colloidal suspension physics

• Poise and viscosity, units of viscosity

Electro-wetting displays

• Hayes and Feenstra, Video-speed electronic paper based on electrowetting, Nature 425, 383-385, 25 September 2003

Organic Light Emitting Diode (OLED)

Display Power

• (1.1) Pedram, Cheng, Hou, Power Minimization in a Backlit TFT-LCD Display by Concurrent Brightness and Contrast Scaling, 2004

LCD greyscale single pixel power consumption formula

• [10] LG Phillips, LP064V1 LCD specifications (640x480px, 0.9W-1.54W)
• [13](1.2) (13) Aoki, Dynamic Characterization of a-Si TFT-LCD Pixels
• (apparently related) Simrata, Subhasis, Gupta, Gate capacitance characteristics of a poly-Si thin film transistor

• (1.6) Iranli, Lee, Pedram, Backlight Dimming in Power-Aware Mobile Displays, 2006
• (1.4) Cheng, Chao, Minimization for LED-backlit TFT-LCDs, 2006

Addresses independant scaling of three color LED backlights based on image histogram

• (1.8) Iranli, Pedram, DTM: Dynamic Tone Mapping for Backlight Scaling, June 2005
• (1.5) Gatti, Acquaviva, Benini, Ricco’, Low Power Control Techniques For TFT LCD Displays, CASES, October 2002
• (1.3) Benini, Hodgson, Siegel, System-level Power Estimation And Optimization, August 1998
• (1.7) Zhong, Jha, Graphical User Interface Energy Characterization for Handheld Computers, October 2003

3.1: Whenever there is a screen change, the processor generates new data for the changing screen pixels and stores them into the framebuffer. This implies a higher energy consumption with increased temportal changes in the screen. Meanwhile, to maintain a screen on the LCD, the LCDC must sequentially read screen data from the frame-buffer and refresh the LCD pixels even when there is no screen change.

3.1: The display itself consists of several parts: LCD power circuitry, a front light, and an LCD. The LCDs used in the systems we studied are color active thin film transistor (TFT) LCDs. In such LCDs, each pixel has three comonents: R, G and B, signifying red, green and blue, respectively. Liquid crystals for each component are independently oriented by two polarizers, which are connected to a storage capacitor. The capacitor is in turn charged and discharged through a TFT to accommodate screen changes. Moreover, the capacitor must be refreshed at a high rate to maintain an appropriate voltage across the polarizers so that the corresponding liquid crystals remain properly oriented.

• (1.9) Kudurshian, Techniques in Decreasing Power Consumption for Handheld Displays, 2002
• (1.10) Choi, Shim, Chang, Low-Power Color TFT LCD Display for Hand-Held Embedded Systems, 2002
• (1.11) Marks, Power Consumption in Multiplexed Liquid-Crystal Displays, IEEE Transactions on Electron Devices, Vol. ED-29, No. 8, August 1982
• (1.16) Ruckmongathan, Govind, Deepak, Reducing Power Consumption in Liquid-Crystal Displays, 2006
• (1.18) Aerts, Verlaak, Heremans, Design of an Organic Pixel Addressing Circuit for an Active-Matrix OLED Display, 2002
• Chung, Chen, Cheng, Yeh, A Physically-Based Built-in Spice Poly-Si TF" Model for Circuit Simulation and Reliability Evaluation, IEEE 1996
• Jagar, Cheng, Zhang, Wang, Poon, Kok, Chan, A SPICE Model for Thin-Film Transistors Fabricated on Grain-Enhanced Polysilicon Film

Active Matrix (Thin Film Transistor, TFT)

• Guo, Silva, Circuit simulation of current-modulated field emission display pixel driver based on carbon nanotubes, Electronics Letters, September 2nd, 2004
• MOS16(2.0) poly-Si TFT model AIM-SPICE, HSPICE

Display Drivers

• Display Buffer Formats, MSDN Library

Image Quality

• Universal Image Quality Index
• The Structureal Similarity (SSIM) Index for Image Quality Assessment
• MSU image quality software tool from Russian developer

Last printed: 1.24