Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1994-04-28
1996-11-26
Hjerpe, Richard
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
178 18, G09G 500
Patent
active
055790364
ABSTRACT:
A bracket for shielding a capacitive touch screen from external noise arising from stray capacitance comprises upper and lower complementary rectangular conductive metal shield elements which are joined together inside a housing with a transparent touch screen retained therebetween. The upper shield element is provided with a large central aperture so that the touch screen is accessible to a user. The lower shield element is also provided with a large central aperture to enable a display, such as an LCD, to be viewed through the transparent touch screen. The display is secured to the lower shield element with an insulating member interposed between the display and the lower shield element. The shielding bracket provides a full shield for the upper, lower and edge surfaces of the touch screen to prevent the capacitance of a hand resting upon the housing from interfering with the touch screen.
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"Methods to Minimize the Effects of LCD M-Signal Noise on the Operation of an Attached Sensor Screen" IBM Technical Disclosure Bulletin, vol. 34, No. 7B, Dec. 1991.
AT&T Global Information Solutions Company
Hjerpe Richard
Martin Paul W.
Mengistu Amare
Sessler Jr. Albert L.
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