Flat-panel detector comprising light-transmission layer between ray-conversion layer and photoelectric conversion layer and method of manufacturing flat-panel detector

A flat-panel detector comprising:

• a ray-conversion layer configured to convert a ray into a light having a first wavelength;
• and
• a plurality of imaging units, at least one imaging unit of the plurality of imaging units comprising:
• a photo sensor configured for receiving the light and converting the light to an electrical signal;
• a light guider located at a first side of the photo sensor adjacent to the ray-conversion layer, the light guider having a light entry surface adjacent to the ray-conversion layer and a light exit surface adjacent to the photo sensor, the light entry surface being configured to receive the light from the ray-conversion layer and having an area greater than an area of the light exit surface, and an orthogonal projection of the light exit surface in a direction perpendicular to the ray-conversion layer at least partially overlapping that of the photo sensor;
• and
• a read circuit electrically connected to the photo sensor and configured to read the electrical signal provided by the photo sensor;
• and
• wherein the light guider comprises:
• a fiber optic taper comprising a first end and a second end that are opposite to each other, the first end is a light entry portion, the second end is a light exit portion, and the fiber optic taper is disposed in a one-to-one correspondence with the photo sensor so that the light having the first wavelength is transmitted, via the light exit portion of the second end of the fiber optic taper, to the photo sensor;
• and
• a reflective layer disposed on a tapered wall of the fiber optic taper.