Pressure detection method, pressure detection method of bonding device using the same, and bonding system including the same

A bonding system comprising:

• a chamber having a space;
• a stage located in the chamber, the stage on which a backplane substrate including a light emitting element is mounted, a pressure detection sheet disposed on the light emitting element of the backplane substrate;
• a pressurizing member located in the chamber and pressurizing the pressure detection sheet;
• a pressurization source supplying a gas into the chamber and providing air pressure to the pressurizing member;
• and
• an image capturing device photographing the pressure detection sheet and detecting a color developing area of the pressure detection sheet.

A pressure detection method comprising:

• pressurizing a pressure detection sheet;
• photographing the pressure detection sheet;
• acquiring an image of an area of the pressure detection sheet;
• detecting, in the image, a color developing area color-developed by a color component and a peripheral area which is not color-developed;
• setting a plurality of detection pixels by splitting the image;
• detecting a number of color pixels having a ratio of the color developing area equal to or greater than a predetermined ratio among the plurality of detection pixels;
• and
• detecting an area of the color developing area of the pressure detection sheet, based on the number of the color pixels.