The invention provides a thin-film diode, a dual scanning diode array substrate and a liquid crystal display panel, wherein the thin-film diode is suitable for being configured on a substrate. The thin-film diode comprises a first electrode, an insulating layer, an active layer and a second electrode, wherein the first electrode is configured on the substrate, the insulating layer is configured on the substrate so as to cover the first electrode, and the insulating layer is provided with an opening so as to expose the partial area of the first electrode; the active layer is configured on the first electrode, and extends to the insulating layer from the first electrode exposed through the opening; the second electrode is respectively configured on the insulating layer and the active layer; and the active layer is at least positioned in the coverage range of the second electrode. The invention also provides a liquid crystal display panel and a dual scanning diode array substrate with the thin-film diode.