Pen input to liquid crystal display
First Claim
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1. In a liquid crystal display having multiple pixels, the improvement comprising:
- a plurality of sensor devices, each of said sensor devices being physically positioned adjacent a corresponding one of the pixels and each of said sensor devices being adapted for producing a detectable signal in response to input excitation from a hand-held stylus;
a first plurality of sense lines connected to respective ones of said sensor devices for carrying signals produced by said sensor devices;
a second plurality of pixel energization lines which are distinct from said first plurality of sense lines, said energization lines being connected to respective ones of the pixels; and
a third plurality of excitation lines connected to both said sensor devices and the pixels whereby said sensor devices are independently operable from the pixels.
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Abstract
A liquid crystal display comprises multiple capacitors which apply electric fields to liquid crystal material located between the capacitor plates. In the invention, each capacitor is associated with a sensor which detects the presence of a hand-held stylus. The detection can be done optically, acoustically, by pressure, by temperature, or by other means.
213 Citations
9 Claims
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1. In a liquid crystal display having multiple pixels, the improvement comprising:
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a plurality of sensor devices, each of said sensor devices being physically positioned adjacent a corresponding one of the pixels and each of said sensor devices being adapted for producing a detectable signal in response to input excitation from a hand-held stylus; a first plurality of sense lines connected to respective ones of said sensor devices for carrying signals produced by said sensor devices; a second plurality of pixel energization lines which are distinct from said first plurality of sense lines, said energization lines being connected to respective ones of the pixels; and a third plurality of excitation lines connected to both said sensor devices and the pixels whereby said sensor devices are independently operable from the pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification
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Current AssigneeNCR Corporation
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Original AssigneeNCR Corporation
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InventorsBaur, Peter F.
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Primary Examiner(s)Kuntz, Curtis
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Assistant Examiner(s)CHIN, VIVIAN C
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Application NumberUS08/275,465Time in Patent Office971 DaysField of Search341/34, 341/23, 345/156, 345/173, 345/182, 345/104, 345/87, 345/98, 345/100, 345/103, 178/18, 178/19US Class Current345/104CPC Class CodesG06F 3/0412 Digitisers structurally int...G06F 3/042 by opto-electronic meansG06F 3/046 by electromagnetic means
