NOVELTY - A substrate structure (10) applied in flexible devices comprises carrier (12); release layer (14) with first area (A1) formed on carrier and having first adhesion force to carrier; and flexible substrate (16) with second area (A2) overlying part of first area of the release layer and contacting the carrier, and has second adhesion force to release layer and third adhesion force to the carrier. The first area is larger than or equal to the second area. The third adhesion force is greater than the first adhesion force. The first adhesion force is greater than the second adhesion force.    USE - As a substrate structure which may be applied to various flexible devices such as flexible electronic display, flexible electronic touch panel, flexible solar cell, flexible electronic sensor, and flexible bioprobe; preferably the flexible display for mobile devices e.g. digital camera, personal digital assistant (PDA), smart phone, or tablet; and also used in present semiconductor or thin film transistor fabrication equipment and handling apparatus.    ADVANTAGE - In the substrate structure, the second adhesion force of the flexible substrate to the release layer is less than or equal to 50 gf/inch, and the third adhesion force of the flexible substrate to the carrier is greater than 50 gf/inch. Also, the area of the flexible substrate is less than or equal to the area of the release layer and the adhesion force of the release layer to the carrier is greater than the adhesion force of the flexible substrate to the release layer. Thus, during or after thin film transistor (TFT) processing and display making, the flexible substrate remains attached to the carrier, without peeling off. After a separation step, the flexible substrate is de-bonded from the original structure and the release layer is left on the carrier.    DESCRIPTION OF DRAWING(S) - The figure shows a top view of substrate structure applied in flexible devices.    Substrate structure (10)    Carrier (12)    Release layer (14)    Flexible substrate (16)    First area (A1)    Second area (A2)