Pattern identification device and display apparatus

A pattern identification device for identifying a pattern over a first surface thereof, comprising:

• a photosensitive layer comprising a plurality of photosensitive elements, each configured to convert a light shedding thereon into an electrical signal;
• and
• a light-guiding layer disposed between the photosensitive layer and the first surface;
• wherein:
• the light-guiding layer comprises a plurality of light-guiding units, each positionally corresponding to one of the plurality of photosensitive elements, wherein:
• each of the plurality of light-guiding units comprises a plurality of light-transmitting portions, each configured to guide a light beam reflected from a feature of the pattern positionally corresponding thereto to transmit therethrough and reach one of the plurality of photosensitive elements corresponding to the each of the plurality of light-guiding units;
• each of the plurality of light-transmitting portions comprises a through-hole surrounded by at least one light-shielding portion;
• an angle of the light beam transmitting through the each of the plurality of light-transmitting portions and reaching the one of the plurality of photosensitive elements corresponding to the each of the plurality of light-guiding units relative to a plane substantially perpendicular to the through-hole is within a range of 88.8°-90°;
• the pattern identification device further comprises a transparent cover, disposed between the light-guiding layer and the first surface;
• a cross-sectional shape of the through-hole in the each of the plurality of light-transmitting portions in a plane parallel to the transparent cover is circular;
• a diameter of the circular cross-section of the through-hole in the each of the plurality of light-transmitting portions is denoted by d;
• a minimum distance between central points of two adjacent through-holes corresponding to different photosensitive elements is denoted by L1;
• a distance between the surface of the transparent cover opposing to the photosensitive layer and a surface of the light-guiding layer facing the transparent cover is denoted by a;
• a thickness of the light-guiding layer is denoted by h;
• and
• h
• ≥
• 2
• ⁢
• a
• ⁢
• d
• L
• ⁢
• 1
• -
• d
• .