Position sensing display
First Claim
Patent Images
1. An active matrix display, comprising:
- a front panel and a rear panel;
wherein the front panel includes;
a transparent substrate;
a common electrode for cooperating with the rear panel for driving liquid crystal;
a plurality of sense electrodes extending across the display, wherein the sense electrodes include first sense electrodes and second sense electrodes extending across the first sense electrodes and the first sense electrodes are x sense electrodes extending across the display in a column direction and the second sense electrodes are y sense electrodes extending across the display in a row direction;
the rear panel includes;
a substrate; and
an array of display pixels arranged as rows and columns;
a plurality of sense circuits coupled to the respective sense electrodes; and
coupling capacitors capacitively coupling the sense electrodes to the respective sense circuits for coupling sense signals from the sense electrodes to the sense circuits,wherein the coupling capacitors comprise;
respective coupling electrodes connected to each of the sense electrodes on the front panel, the coupling electrodes extending beyond the common electrode to a coupling region; and
respective coupling electrodes connected to each of the sense circuits on the rear panel aligned with respective coupling electrodes on the front panel, and the respective coupling electrodes and the coupling region are arranged outside the array of display pixels, and for the coupling capacitors, the liquid crystal acts as a dielectric.
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Abstract
A position sensing display integrates a touch sensor with an active matrix LCD panel. X sense electrodes and y sense electrodes in respective layers on a front panel are coupled capacitatively to respective sense circuits on active rear panel. A common electrode is driven, and the resulting signal on the x-sense electrodes and y sense electrodes is measured by the respective sense circuits. Changes in the resulting signal when sensed object approaches are measured to locate the sensed object.
11 Citations
9 Claims
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1. An active matrix display, comprising:
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a front panel and a rear panel; wherein the front panel includes; a transparent substrate; a common electrode for cooperating with the rear panel for driving liquid crystal; a plurality of sense electrodes extending across the display, wherein the sense electrodes include first sense electrodes and second sense electrodes extending across the first sense electrodes and the first sense electrodes are x sense electrodes extending across the display in a column direction and the second sense electrodes are y sense electrodes extending across the display in a row direction; the rear panel includes; a substrate; and an array of display pixels arranged as rows and columns; a plurality of sense circuits coupled to the respective sense electrodes; and coupling capacitors capacitively coupling the sense electrodes to the respective sense circuits for coupling sense signals from the sense electrodes to the sense circuits, wherein the coupling capacitors comprise; respective coupling electrodes connected to each of the sense electrodes on the front panel, the coupling electrodes extending beyond the common electrode to a coupling region; and respective coupling electrodes connected to each of the sense circuits on the rear panel aligned with respective coupling electrodes on the front panel, and the respective coupling electrodes and the coupling region are arranged outside the array of display pixels, and for the coupling capacitors, the liquid crystal acts as a dielectric. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of sensing the position of a sensed object with an active matrix liquid crystal display with a transparent front substrate with a common electrode, a plurality of first sense electrodes extending across the display in a first x direction, and a plurality of second sense electrodes extending across the display in a second y direction across the row sense electrodes and an active rear substrate with an array of display pixels and a plurality of row sense circuits and column sense circuits, coupling capacitors capacitively coupling the sense electrodes to the respective sense circuits for coupling sense signals from the sense electrodes to the sense circuits,
wherein the coupling capacitors comprise: -
respective coupling electrodes connected to each of the sense electrodes on the front panel, the coupling electrodes extending beyond the common electrode to a coupling region; and respective coupling electrodes connected to each of the sense circuits on the rear panel aligned with respective coupling electrodes on the front panel, and the respective coupling electrodes and the coupling region are arranged outside the array of display pixels, and for the coupling capacitors, the liquid crystal acts as a dielectric, the method comprising; driving the common electrode with a drive signal;
capacitatively coupling the drive signal on the first sense electrodes and second sense electrodes to respective row sense circuits and column sense circuits; anddetecting the capacitatively coupled drive signal on the row sense circuits and column sense circuits; and
detecting the changes in the detected drive signal on particular row sense circuits and column sense circuits caused by the presence of a sensed object adjacent to respective row sense electrodes and column sense electrodes to locate the sensed object. - View Dependent Claims (9)
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Specification