Liquid Crystal Displays 2 Symmetry Smaller, lighter, with no radiation problems. Found on portables and notebooks, and starting to appear and more on desktops ASymmetry: Point Symmetry rather than emitted. Use of super-twisted crystals pace Symmetry have improved the viewing angle, and response rates 832 Point Groups of Crystals are improving all the time (necessary for tracking .Unit Cell, 7 Crystal Systems, Lattice Planes cursor accurately) Miller indices .Lattices and 14 Bravias Types of Lattices ●230 Space Group Crystal Symmetry Symmetry in Nature, Art and Math Symmetry is one idea by which man through the ages has tried to comprehend and create order Mathematics of Symmetry beauty and perfection. - Hermann Weyl Crystals Symmetry Physical Properties caused by Symmetry 米" Eiffel tower in Paris. France is a wonderful example of symmetry Macroscopic Symmetry Elements Point Symmetry Elements) Mirror Plane Symmetry mirror plane symmetry arise E Point symmetry elements operate to change the a°。o。°° when one half of an object is orientation of structural motifs A point symmetry operation does not alter at °。。o。 the mirror image of the other least one point that it operates on Symmetry Elements and Symmetry Operations 1. Mirror Planes -Reflection or Mirror 2. Center of Symmetry 3. Rotation axis -Rotate Can be folded in half 4. Rotoinversion axis -Rotate and inverse Seen externally with animals6 Smaller, lighter, with no radiation problems. Found on portables and notebooks, and starting to appear more and more on desktops. Less tiring than c.r.t. (Cathode -ray tube) displays, and reduce eye-strain, due to reflected nature of light rather than emitted. Use of super -twisted crystals have improved the viewing angle, and response rates are improving all the time (necessary for tracking cursor accurately). Liquid Crystal Displays 2 Symmetry Symmetry: Point Symmetry Space Symmetry 32 Point Groups of Crystals Unit Cell, 7 Crystal Systems, Lattice Planes, Miller indices Lattices and 14 Bravias Types of Lattices 230 Space Groups Crystal Symmetry ß Mathematics of Symmetry ß Crystal’s Symmetry ß Physical Properties caused by Symmetry Symmetry in Nature, Art and Math Symmetry is one idea by which man through the ages has tried to comprehend and create order, beauty and perfection. ¾ Hermann Weyl Eiffel tower in Paris, France is a wonderful example of symmetry Macroscopic Symmetry Elements (Point Symmetry Elements) Point symmetry elements operate to change the orientation of structural motifs A point symmetry operation does not alter at least one point that it operates on Symmetry Elements and Symmetry Operations: 1. Mirror Planes — — Reflection or Mirror 2. Center of Symmetry — — Inverse 3. Rotation Axis — — Rotate 4. Rotoinversion Axis — — Rotate and inverse Mirror Plane Symmetry Mirror plane symmetry arises when one half of an object is the mirror image of the other half •Can be folded in half •Seen externally with animals s s