ON Semiconductor showcases fast autofocus technology for use in low light

     ON Semiconductor, which is driving energy efficient innovation, has successfully demonstrated its second generation phase detection autofocus (PDAF) technology featuring a unique pixel micromirror technology that enables fast focus at 25 Lux light levels. This unique technology has been successfully implemented in a 13-megapixel (MP) test chip with 1.1 micrometers (um) pixels and will be used in new products introduced to customers in the mobile end market this year.

     Traditional smartphone autofocus (AF) algorithms use contrast detection measurements and multiple frames to adjust the lens focal length. This trial and error method can take more than 1.2 seconds to find the focus of the image. On Semiconductor's PDAF technology uses two pixels to measure the phase information of the target image. This phase information is used to calculate the direction and distance needed to focus the lens in less than 0.3 seconds, depending on the speed of the focusing actuator.

     In addition, ON Semiconductor has implemented a unique pixel micromirror structure that maintains the sensitivity of the PDAF pixels and ensures that enough light is captured for the PDAF to operate at a low light level of 25 Lux (similar to a dimly lit room). Competing technologies on the market employ approaches that compromise on pixel sensitivity and low-light autofocus performance.

     Shung Chieh, Vice president, Mobile and Consumer Division, ON Semiconductor, said: "ON Semiconductor's PDAF technology is the result of innovations in pixel and optical laminated design. This reduces autofocus time by nearly a quarter, resulting in a great experience for mobile device users. Our technologically leading low light capability enables smartphone manufacturers to give their customers fast autofocus in all lighting situations."