Optical proximity sensor and manufacturing method thereof

A complex optical proximity sensor, comprising:

• a substrate;
• a light emitter coupled to the substrate;
• an application-specific integrated circuit chip coupled to the substrate with a proximity sensor installed on the chip and a barrier disposed between the chip and the light emitter;
• and
• an ambient light detection chip separately manufactured and then coupled to the application-specific integrated circuit chip, the ambient light detection chip extending to a pre-determined height relative to a laterally extended surface of the application-specific integrated circuit chip;
• said ambient light detection chip being offset in position from the proximity sensor to be laterally spaced therefrom and to thereby form a complex optical proximity sensor;
• whereby a light is emitted from the light emitter and reflected to the proximity sensor for detection;
• the barrier is arranged at a pre-determined height to prevent interference from the emitted light to the proximity sensor and to minimize a detection angle of the proximity sensor;
• and the ambient light detection chip is manufactured separately with a height in accordance with the height of the barrier to maximize a detection angle of the ambient light detection chip.