In-cell touch liquid crystal display apparatus, method of manufacturing the same, method of manufacturing thin film transistor array substrate, and method of manufacturing color filter array substrate
Disclosed are an in-cell touch liquid crystal display (LCD) device based on a twisted nematic (TN) mode, a method of manufacturing the same, a method of manufacturing a thin film transistor (TFT) array substrate, and a method of manufacturing a color filter array substrate. The TFT array substrate includes a TFT disposed in a pixel area defined by an intersecting gate line and data line, a conductive line disposed on the TFT, and a transparent conductive layer in electrical contact with the conductive line. The color filter array substrate includes a light shield layer, a color filter, an overcoat layer covering the light shield layer and the color filter, a column spacer disposed on the overcoat layer, and a common electrode disposed on the overcoat layer and the column spacer, where the conductive line supplies the common electrode with a common voltage or a touch driving signal.
1. An in-cell touch liquid crystal display (LCD) device comprising:
a thin film transistor (TFT) array substrate including:
a gate line and a data line that intersect each other to define a pixel area on a first glass substrate,
a TFT disposed in the pixel area,
a first passivation layer disposed above the TFT,
a conductive line disposed on the first passivation layer to horizontally overlap with the data line, and
a transparent conductive layer disposed above the conductive line and in electrical contact with the conductive line;
a pixel electrode disposed above the first passivation layer, the pixel electrode electrically connected to the TFT through a first contact hole in the first passivation layer, the pixel electrode being on a same layer as at least a part of the transparent conductive layer,
a color filter array substrate including:
a light shield layer and a color filter disposed on a second glass substrate,
an overcoat layer covering the light shield layer and the color filter,
a column spacer disposed on the overcoat layer to horizontally overlap with the light shield layer, and
a common electrode disposed on the overcoat layer and the column spacer, the conductive line configured to supply the common electrode with a common voltage or a touch driving signal through the transparent conductive layer in electrical contact with the common electrode; and
a liquid crystal layer disposed between the TFT array substrate and the color filter array substrate.
2. The in-cell touch LCD device of claim 1 , further comprising:
a first buffer layer disposed between the first passivation layer and the TFT; and
a second buffer layer disposed between the conductive line and the first passivation layer.
3. The in-cell touch LCD device of claim 1 , further comprising a second passivation layer disposed on an upper surface of the conductive line, the transparent conductive layer electrically connected to the conductive line through a second contact hole in the second passivation layer.
4. The in-cell touch LCD device of claim 3 , wherein the second passivation layer contacts the TFT through the first contact hole in the first passivation layer.
5. The in-cell touch LCD device of claim 3 , wherein the transparent conductive layer and the pixel electrode are each on the second passivation layer.
6. The in-cell touch LCD device of claim 1 , wherein the transparent conductive layer is composed of a same material as the pixel electrode.
7. The in-cell touch LCD device of claim 1 , wherein the transparent the conductive line is configured to supply the common electrode with the common voltage during a display period and to supply the common electrode with a touch driving signal during a touch period.