초록 ▼

A display device locates a touch anywhere on a conductive display faceplate by measuring plural electrical impedances of the faceplate conductive coating. The impedances are at electrodes located on different edges of the faceplate. A touch locating circuit determines the location of a touch using k

A display device locates a touch anywhere on a conductive display faceplate by measuring plural electrical impedances of the faceplate conductive coating. The impedances are at electrodes located on different edges of the faceplate. A touch locating circuit determines the location of a touch using known pulsed signals and, in another embodiment, using a tuned measuring signal.

대표청구항 ▼

In a touch-responsive display device having a faceplate, the improvement comprising A. at least a first electrode disposed on the faceplate at a known relative location along at least a first direction, B. an electrically-conductive coating on said faceplate connected in circuit with said coating an

In a touch-responsive display device having a faceplate, the improvement comprising A. at least a first electrode disposed on the faceplate at a known relative location along at least a first direction, B. an electrically-conductive coating on said faceplate connected in circuit with said coating and extending continuously therefrom along at least said first direction, said coating presenting to said first electrode an electrical impedance responsive to the relative location along said first direction of a capacitive touch of the faceplate, and C. measuring means for applying an impedance-measuring signal of selected character to said electrode, and for responding to the response of said electrical impedance of said faceplate coating to said measuring signal for identifying the location along said first direction relative to said electrode of a capacitive touch of the faceplate.