Window manufacturing device and window manufacturing method using the same

A window manufacturing method comprising:

• preparing a tank defining a concave groove;
• arranging a preliminary window including a first area and a second area next to the first area with the first area interposed therebetween in the concave groove of the tank;
• arranging an upper film defining an opening overlapping the first area of the preliminary window on the preliminary window;
• preparing a control module including a pad attaching part to which a first pad and a second pad spaced apart from the first pad are coupled;
• moving the control module so that the first pad and the second pad are arranged inside the opening of the upper film;
• providing an etchant to the concave groove of the tank;
• primarily etching the preliminary window non-contacting the first pad and the second pad;
• moving the control module in a direction away from the preliminary window so that first portions of the first pad and the second pad are exposed from the opening of the upper film;
• secondarily etching the preliminary window non-contacting the first pad and the second pad;
• and
• forming a window from the preliminary window.