초록 ▼

A portable cellular telephone comprising a main body for housing at least a microcontroller, a display screen, an audio receiver and a microphone. An extendible section that houses a number of function keys such as the standard telephone keys, slides out of the main body to expose the display screen

A portable cellular telephone comprising a main body for housing at least a microcontroller, a display screen, an audio receiver and a microphone. An extendible section that houses a number of function keys such as the standard telephone keys, slides out of the main body to expose the display screen in its entirety. The extendible section also includes LED's to back light the keys when desirable. The electrical connections between the extendible section and the main body are achieved through wiper contacts in the main body that slide over conductive strips on the under surface of the extendible section. The keys in the extendible section are each connected to resistors of different values, these resistor/key combinations are all connected in parallel to two conductive strips. A resistor bridge is formed by connecting a resistor in the main body to the resistor key combinations. The voltage change at the junction between the resistor and the combinations is detected to sense the closure of a key, and the voltage value is used to identify the key that is closed. The device also detects when the extendible section is in the open or closed positions. The extendible section is mounted such that it will detach from the main body when a force is applied to it such as by dropping the telephone; the section may be simply replaced by snapping it back into place without damage to the telephone.

대표청구항 ▼

[ What is claimed is:] [1.]1. A portable wireless communications device comprising:a main body including at least a microcontroller and a display screen attached to the microcontroller;an extendible section slidably mounted in the main body to cover a significant partial portion of the display scree

[ What is claimed is:] [1.]1. A portable wireless communications device comprising:a main body including at least a microcontroller and a display screen attached to the microcontroller;an extendible section slidably mounted in the main body to cover a significant partial portion of the display screen in a fully non-extended position and extending from the main body in a fully extended position to uncover the entire display screen, the extendible section having a user input component mounted thereon and electrically connected to the microcontroller, said portable wireless communications device being fully functional in both the extended position and the non-extended position.