Optical module for preventing cross talk due to undesirable refection light, manufacturing process thereof and electronic device comprising the same

A process of manufacturing an optical module, comprising:

• providing a carrier, the carrier having a first surface;
• disposing a light source structure adjacent to the first surface, the light source structure configured to emit light in a first polarization direction;
• disposing a light detection structure adjacent to the first surface, the light detection structure configured to admit light in a second polarization direction, wherein the first polarization direction is substantially perpendicular to the second polarization direction;
• and
• disposing a transparent sheet above the light source structure and the light detection structure, the transparent sheet having a first surface and a second surface opposite to the first surface, the first surface of the transparent sheet facing the first surface of the carrier, the second surface of the transparent sheet comprising a waveplate configured to transform the light emitted from the light source structure and passing through the waveplate into light having a different polarization state.

An electronic device, comprising:

• a light source;
• a light detector;
• an enclosure encapsulating the light source and the light detector;
• a waveplate configured to cover the light source and the light detector such that a first light beam emitted from the light source passes through the waveplate and reaches an object, and the first light beam reflected by the object passes through the waveplate and reaches the light detector;
• and
• a transparent sheet, having a first surface and a second surface opposite to the first surface, the first surface of the transparent sheet facing the light source, wherein the waveplate is disposed adjacent to one of the first surface or the second surface of the transparent sheet.