Laser control structure and laser bonding method using the same

A laser bonding method comprising:

• forming bonding portions on a substrate;
• providing a bonding object onto the bonding portions;
• providing a laser control structure onto the bonding object or the substrate;
• irradiating a laser using a surface light source toward the laser control structure;
• controlling quantity of laser light absorbed through the laser control structure;
• using the controlled quantity of laser light to heat the bonding portions and the bonding object to a bonding temperature;
• and
• bonding the bonding portions and the bonding object,
• wherein the laser control structure includes:
• a first substrate including a first region and a second region;
• a first thin film laminate on the first region;
• and
• a second thin film laminate on the second region,
• wherein:
• the first thin film laminate includes a plurality of first thin film layers and a plurality of second thin film layers, which are alternately and repeatedly laminated on the first region,
• the second thin film laminate includes at least one third thin film layer and at least one fourth thin film layer, which are laminated on the second region,
• each of the first thin film layers and the third thin film layer comprise a first material,
• each of the second thin film layers and the fourth thin film layer comprise a second material different from the first material,
• a thickness of each of the first thin film layers is less than a thickness of the third thin film layer,
• a thickness of each of the second thin film layers is less than a thickness of the fourth thin film layer,
• a number of laminated first thin film layers is greater than a number of the third thin film layer,
• a number of laminated second thin film layers is greater than a number of the fourth thin film layers,
• reflectance or absorptivity of the first thin film laminate with respect to laser is different from reflectance or absorptivity of the second thin film laminate, and
• the bonding temperature varies according to the quantity of laser light absorbed.