Touch sensor and organic light emitting display apparatus

An organic light-emitting display comprising:

• a substrate;
• a thin film transistor formed over the substrate, wherein the thin film transistor comprises an active layer, a gate electrode, a gate insulating layer, a source electrode, and a drain electrode;
• an organic light emitting element electrically connected to the thin film transistor;
• and
• a sensing element formed over the substrate, wherein the sensing element is spaced apart from i) the gate, source and drain electrodes and ii) the active layer, wherein the gate insulating layer extends to the sensing element, and wherein the sensing element is configured to sense that the substrate is touched or approached.

A method of manufacturing an organic light-emitting display, wherein the organic light-emitting display comprises:

• a substrate;
• a thin film transistor formed over the substrate, wherein the thin film transistor comprises an active layer, a gate electrode, a gate insulating layer, a source electrode, and a drain electrode;
• an organic light emitting element electrically connected to the thin film transistor;
• and
• a sensing element formed over the substrate, wherein the sensing element is spaced apart from i) the gate, source and drain electrodes and ii) the active layer, wherein the gate insulating layer extends to the sensing element, and wherein the sensing element is configured to sense that the substrate is touched or approached,
• wherein the sensing element comprises:
• a sensing layer formed over the substrate, wherein the sensing layer is spaced apart from the gate, source and drain electrodes and active layer, and wherein the sensing layer contains ions;
• a touch sensor active layer formed over the sensing unit, wherein the ions are configured to move toward the touch sensor active layer when the substrate is touched or approached by an object or a user;
• a touch sensor source electrode and a touch sensor drain electrode that are electrically connected to the touch sensor active layer, wherein an electrical current is configured to flow between the touch sensor source and drain electrodes;
• a protective layer covering the touch sensor source electrode and the touch sensor drain electrode;
• and
• an opposite electrode formed on the protective layer, wherein at least part of the opposite electrode is formed substantially directly above the touch sensor active layer,
• wherein the method comprises:
• forming at least one of the sensing element substantially simultaneously with at least one element of the thin film transistor.