A personal communicator has a touch sensitive overlay coupled with a liquid crystal display (LCD). The communicator has two external (non-screen) up/down buttons for adjusting the volume of a cellular phone speaker. These volume buttons are also used to allow the user to adjust contrast. In accordance...http://www.google.es/patents/US5422656?utm_source=gb-gplus-sharePatente US5422656 - Personal communicator having improved contrast control for a liquid crystal, touch sensitive display
Personal communicator having improved contrast control for a liquid crystal ...
