Apparatus and method
AssigneeTouch Biometrix Limited
InventorsHenricus Derckx, Wilhelmus Van Lier, Michael A. Cowin
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Abstract
Disclosed herein is a pixel structure comprising a plurality of layers for providing a touch sensitive pixel of a sensing array. The pixel comprises: a thin film transistor, a capacitive sensing electrode, and a reference capacitor comprising a first plate and a second plate. The capacitive sensing electrode and the second plate of the reference capacitor are connected to a gate region of the thin film transistor. Methods of manufacturing such a touch sensitive pixel are also disclosed herein.
Claims11
A pixel structure comprising a plurality of layers for providing a touch sensitive pixel of a sensing array, the pixel comprising:
- a thin film transistor, a capacitive sensing electrode, and a reference capacitor comprising a first plate and a second plate,
- wherein the capacitive sensing electrode and the second plate of the reference capacitor are connected to a gate region of the thin film transistor,
- wherein the gate region and the second plate of the reference capacitor are provided on a first layer of the structure.
A pixel structure comprising a plurality of layers for providing a touch sensitive pixel of a sensing array, the pixel comprising:
- a thin film transistor, a capacitive sensing electrode, and a reference capacitor comprising a first plate and a second plate,
- wherein the capacitive sensing electrode and the second plate of the reference capacitor are connected to a gate region of the thin film transistor,
- wherein the pixel structure comprises a dielectric shield comprising a first surface to be touched by an object to be sensed, and a second surface and wherein the capacitive sensing electrode is disposed between the second surface and the reference capacitor.
A touch sensitive pixel for a touch sensing array, the pixel comprising:
- a thin film transistor comprising:
- a gate region, a source region, and a drain region, wherein the source region is separated from the drain region by a channel region;
- a reference capacitor comprising a first plate and a second plate, and
- a capacitive sensing electrode,
- wherein the first plate of the reference capacitor is arranged for coupling to a control signal for activating the pixel, the source region is arranged for coupling to a reference signal input, and the second plate of the reference capacitor is connected to the gate region and to the capacitive sensing electrode;
- a dielectric shield comprising a first surface to be touched by an object to be sensed, and a second surface;
- wherein the capacitive sensing electrode is disposed adjacent the second surface and covered by an insulating layer and a conductive via through the insulating layer connects the capacitive sensing electrode to the gate electrode and to the second capacitor plate;
- and
- wherein the second capacitor plate and the gate region are separated from the drain region, the source region and the channel region.
Dependencies are inferred from the claim text.