Active matrix substrate, liquid crystal display device with touch sensor using active matrix substrate, and method for manufacturing active matrix substrate

An active matrix substrate comprising:

• a substrate;
• a plurality of TFTs supported on the substrate;
• an interlayer insulating layer that covers the plurality of TFTs;
• a common electrode disposed on the interlayer insulating layer and divided into a plurality of segments each of which functions as a touch sensor electrode;
• a first dielectric layer that covers the common electrode;
• a plurality of pixel electrodes disposed on the first dielectric layer, each of which is electrically connected to any one of the plurality of TFTs;
• a second dielectric layer that covers the plurality of pixel electrodes;
• a plurality of touch wirings disposed on the second dielectric layer, each of which is electrically connected to any one of the plurality of touch sensor electrodes, wherein
• the common electrode k between the plurality of touch wirings and the substrate, the first dielectric layer is between the plurality of touch wirings and the common electrode, the second dielectric layer is between the first dielectric layer and the plurality of touch wirings, and the plurality of pixel electrodes are between the first dielectric layer and the second dielectric layer,
• each of the pixel electrodes at least partially overlaps the common electrode via the first dielectric layer, to define an auxiliary capacitor which includes each of the pixel electrodes, the common electrode, and the first dielectric layer,
• the plurality of touch sensor electrodes include a first electrode, the plurality of touch wirings include a first wiring electrically connected to the first electrode and a second wiring electrically connected to another electrode other than the first electrode in the plurality of touch sensor electrodes, the second wiring extends to the other electrode across the first electrode when viewed from a normal direction of the substrate, and
• a portion of the second wiring overlaps the first electrode via the first dielectric layer and the second dielectric layer, so that a touch wiring capacitance including the second wiring, the first electrode, the first dielectric layer, and the second dielectric layer is formed.