05949408 is referenced by 141 patents and cites 27 patents.

A computer device, for instance a palmtop personal organizer, has a dual-orientation display device with both portrait and landscape modes of viewing the display. The keyboard is automatically disabled when the portrait mode is selected by a user. The display has two digitized regions separated by a workspace, which is preferably also digitized to provide input commands to a processor unit when touched. The display further includes indicia, such as icons or symbols shown on the display, which may be selected to activate a computer program, function or command. These icons are slanted and permanently fixed to the display, so they may be readily understood when viewed from either the portrait or landscape modes. A method is also provided of displaying indicia for viewing from two orthogonal directions. The invention further includes a way to use an analog touch-sensitive panel, having opposing resistive layers, to trigger an interrupt line used for returning the palmtop from a sleep mode. In addition, screen image rotation is accomplished by alternately configuring sets of LCD select lines either as column lines or row lines.

Title
Dual orientation display handheld computer devices
Application Number
535411
Publication Number
5949408
Application Date
February 13, 1997
Publication Date
September 7, 1999
Inventor
Jin Meng Tan
Singapore
SG
Eswin Tedja
Singapore
SG
Chun Wun Yeung
Santa Clara
CA, US
Beng Hong Kang
Farrer Ct
SG
Assignee
Hewlett Packard Company
CA, US
IPC
G06F 3/33
View Original Source