Patent ID: 6901273

Claim:
A portable phone, the portable phone comprising: at least one touch screen display, said at least one touch screen display comprising at least one inner and one outer essentially transparent conducting plate, the inner and outer conducting plates being movable in relation to each other between a first position, in which the plates are spaced apart, and a second position, in which the plates substantially contact each other by the outer plate being depressed by a user of the portable phone; a single power supply for providing power to the voltage controlled switch and the at least one touch screen display; a voltage controlled switch connected to said plates, said voltage controlled switch being adapted to turn on the power of the portable phone upon receipt of a signal indicating that a power-on key or a power-on area has been depressed by the user; a control block connected to the voltage controlled switch, the control block being arranged to perform an initial detection and evaluation whether a touch position is a valid pressed position on the touch-screen display before powering-on the phone; and wherein the control block is arranged to detect whether the touch position lies within an area defined by four co-ordinates or less defining the maximal area of an on-button of an input-means, or whether the touch position lies within any of the areas of two or more on-buttons or within a combined area of adjoining on-buttons.