Measuring method and liquid crystal display panel

A liquid crystal display panel comprising an array substrate and a test electrode, the array substrate comprising:

• a plurality of data lines, a plurality of scan lines, and pixel units;
• wherein the plurality of data lines are used for transmitting data signals;
• the plurality of scan lines are used for transmitting scan signals;
• the pixel units are constituted by the plurality of data lines and the plurality of scan lines which are interlaced, and an image is displayed according to the scan signals and the data signals;
• the pixel unit comprises a thin film transistor and a pixel electrode;
• the thin film transistor is used for transmitting the data signals to the pixel electrode according to the scan signals;
• the test electrode is disposed on an outside of the liquid crystal display panel for measuring a voltage of the pixel electrode;
• a connecting circuit configured to connect the test electrode with the pixel electrode, wherein the connecting circuit comprises a trace on a metal layer of the array substrate;
• a first preliminary welded region formed on the trace on the metal layer;
• a second preliminary welded region formed on the pixel electrode, wherein position of the first preliminary welded region on the trace corresponds to position of the second preliminary welded region on the pixel electrode;
• and
• a middle layer disposed between the first preliminary welded region and the second preliminary welded region and configured to electrically insulate the trace from the pixel electrode.