Presentation is loading. Please wait.

Presentation is loading. Please wait.

Liquid Crystals A Unique State of Matter Prepared By: Joseph A. Castellano, Ph.D., RESEED Silicon Valley, 2008.

Similar presentations


Presentation on theme: "Liquid Crystals A Unique State of Matter Prepared By: Joseph A. Castellano, Ph.D., RESEED Silicon Valley, 2008."— Presentation transcript:

1 Liquid Crystals A Unique State of Matter Prepared By: Joseph A. Castellano, Ph.D., RESEED Silicon Valley, 2008

2 Solid or Crystal State

3 Liquid Crystal State

4 Liquid Crystal Ordering Single Molecules Attractive Forces Hold Molecules in Line Each line of molecules can slide past each other

5 Normal Liquid State

6 Solid Liquid Crystal Liquid Heat Cool Changes from One State to Another A Completely Reversible Physical Change

7 Liquid Crystal Molecule Licristal K-18 made by E. Merck, Darmstadt, Germany

8 Liquid Crystals under a Microscope Scanning Tunneling Microscope photo of a liquid crystal mixture 100 x 100 Angstrom Units Molecular model of the mixture Source: Frommer, J., Liquid Crystals Today, 3 (2) 1993; Photos taken at IBM Almaden Research Center

9 Observing the Liquid Crystal State Heat Cool Solid (Crystals) Liquid Crystal (Opaque) Clear Liquid A Completely Reversible Physical Change

10 Phase Change Diagram For K-18 Liquid Crystal

11 Drop of Liquid Crystal on Glass

12 Thin Layer of Liquid Crystal in Nematic (Thread-like) Phase

13 Motion of Liquid Crystals in Electric Fields

14 Liquid Crystals Uses Displays for Electronic Products Displays for Electronic Products -Computers -Television -Cell Phones -iPODs -Clocks and watches -Instrument gauges -Thermometers Temperature Sensors Temperature Sensors Biological Research Biological Research Chemical Structure Analysis Chemical Structure Analysis

15 Liquid Crystals Displays (LCDs) Why Liquid Crystals? Why Liquid Crystals? -Very Low Power Consumption -Low Voltage Operation -Very Thin Display -Compatible with Digital Electronics -Can be made in many different sizes

16 First Liquid Crystal Display 1967 – RCA Laboratories

17 First Watches to use LCDs

18 First LCD Computer Displays 8 x 3-inch Screens1983

19 First LCD Color Television 2-inch diagonal screen -1983

20 Simple Version of Liquid Crystal TV Display Assembly

21 Cross-section of One Picture Element In Color Liquid Crystal TV Display

22 Increasing Screen Size of LCD Televisions

23 45-inch screen Sharp inch screen LG.Philips

24 Increasing Screen Size of LCD Televisions 82-inch screen Samsung – 2005

25 Increasing Screen Size of LCD Televisions 100-inch screen LG.Philips – 2006


Download ppt "Liquid Crystals A Unique State of Matter Prepared By: Joseph A. Castellano, Ph.D., RESEED Silicon Valley, 2008."

Similar presentations


Ads by Google