Difference between revisions of "Display Technology"

Revision as of 23:42, 1 March 2007

Paper Search

"LCD power model" search on ACM

Display Technologies

• > Qualcomm report on competitive modern display technologies

• Liquid Crystal Display (LCD)

• > LCD background

• Thin Film Transistor (TFT LCD)

• Active Matrix LCD

• Display Technologies for Portable Communication Devices, 2002

• Electronic paper prototype

Flexible Displays

Electrophroetic Displays

• Electrophoretic technology

• An electrophoretic ink for all-printed reflective electronic displays, 1998

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

[13](1.2) (13) Aoki, Dynamic Characterization of a-Si TFT-LCD Pixels

• (1.9) Iranli, Lee, Pedram, Backlight Dimming in Power-Aware Mobile Displays
• (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

• (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

Other Resources

Display Buffer Formats, MSDN Library