The structure comprises a light sensitive element (37) arranged on a silicon substrate (31), and a multi-layer structure used for a standard CMOS device.
The light-sensitive circuit (21) is used for sensing the luminous brightness of an LED string (11), and generating a corresponding light-sensitive signal value.
When it's exposed to UV light, that triggers special light-sensitive receptors called rhodopsin, which stimulate the production of melanin to shield cells from damage.