Mother substrate for display device, method for manufacturing the same, and method for manufacturing display device

A mother substrate for a display device comprising:

• a first substrate and a second substrate each comprising a panel region comprising the display device, and facing each other;
• the first substrate facing the second substrate, further comprising:
• a first contact electrode, a second contact electrode and a third contact electrode each outside the panel region of the first substrate,
• a gate line, a data line and a storage electrode line,
• a first switching element, a second switching element and a third switching element each connected to a same gate line and a same data line,
• the third switching element connected to the same gate line, the second switching element and the storage electrode line,
• a first subpixel electrode connected to the first switching element, and
• a second subpixel electrode connected to the second switching element;
• the second substrate facing the first substrate, further comprising:
• a common electrode, and
• a first voltage application electrode and a second voltage application electrode separated from each other and each outside the panel region of the second substrate;
• and
• a liquid crystal layer between the first substrate and the second substrate facing each other,
• wherein among the first and second substrates facing each other,
• the first voltage application electrode of the second substrate is connected to the first contact electrode and the third contact electrode of the first substrate,
• the second voltage application electrode of the second substrate is connected to the second contact electrode of the first substrate,
• the first voltage application electrode connected to the first contact electrode of the first substrate is applied with a first voltage, and the second voltage application electrode connected to the second contact electrode of the first substrate is applied with a second voltage different from the first voltage,
• the first contact electrode is connected to the same data line,
• the second contact electrode is connected to the storage electrode line, and
• the third contact electrode is connected to the same gate line to which the first to third switching elements are connected.