Inventions on Tree Navigators used in Graphical User Interface
  A tree view or tree navigator is used to display hierarchical data organized in the form of a tree. In a tree structure there are parent and child nodes. The child nodes may further have descendants to n levels.   There are many methods to make the navigation easy. Some of these are expanding and collapsing branches, splitting the tree, displaying a parent node in a separate tree, zooming branches, scrolling in various directions etc. It is still a difficult exercise to handle large trees efficiently. The effort still continues to manage large number of nodes with faster speed, greater control, user friendliness and aesthetics.   This article illustrates five inventions on tree navigators selected from US patent database. Each of them tries to solve various problems relating to the tree navigator in different ways. Each invention is also analyzed from a TRIZ perspective. 
Umakant Mishra
cs.HC