US 12,475,733 B2
Pattern recognition module and display apparatus
Xiaoquan Hai, Beijing (CN); Xue Dong, Beijing (CN); Guangcai Yuan, Beijing (CN); Xiaochuan Chen, Beijing (CN); and Yingzi Wang, Beijing (CN)
Assigned to Beijing BOE Technology Development Co., Ltd., Beijing (CN)
Appl. No. 18/705,177
Filed by BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Oct. 29, 2021, PCT No. PCT/CN2021/127297
§ 371(c)(1), (2) Date Apr. 26, 2024,
PCT Pub. No. WO2023/070498, PCT Pub. Date May 4, 2023.
Prior Publication US 2024/0428609 A1, Dec. 26, 2024
Int. Cl. G06V 40/13 (2022.01)
CPC G06V 40/13 (2022.01) 20 Claims
OG exemplary drawing
 
1. A print recognition module, comprising:
a print recognition substrate, wherein the print recognition substrate comprises a base substrate and a plurality of photosensitive devices arranged in an array on a side of the base substrate;
a light restriction layer, arranged in direct contact with a side of the print recognition substrate providing with the plurality of photosensitive devices; wherein the light restriction layer comprises at least one diaphragm layer, and a micro-lens layer on a side of the diaphragm layer facing away from the print recognition substrate;
wherein the diaphragm layer comprises light-transmitting holes arranged in an array;
orthographic projections of the light-transmitting holes on the base substrate are located in orthographic projections of the photosensitive devices on the base substrate;
the micro-lens layer comprises a plurality of micro-lenses arranged at intervals; and
orthographic projections of the micro-lenses on the base substrate cover and are larger than the orthographic projections of the light-transmitting holes on the base substrate;
wherein the light restriction layer comprises at least two diaphragm layers;
the light-transmitting holes in each of the diaphragm layers correspond to each other one-to-one; and orthographic projections of the light-transmitting holes in each of the diaphragm layers on the base substrate are at least partially overlapped with each other;
wherein in a direction facing away from the print recognition substrate, the diaphragm layers comprise a first diaphragm layer, a second diaphragm layer and a third diaphragm layer arranged in sequence;
the first diaphragm layer comprises first light-transmitting holes arranged in an array, the second diaphragm layer comprises second light-transmitting holes arranged in an array, and the third diaphragm layer comprises third light-transmitting holes arranged in an array;
orthographic projections of the second light-transmitting holes on the base substrate cover and are larger than orthographic projections of the first light-transmitting holes on the base substrate; and
the orthographic projections of the second light-transmitting holes on the base substrate are located in orthographic projections of the third light-transmitting holes on the base substrate;
wherein the micro-lenses are arranged in one-to-one correspondence with the light-transmitting holes, and each micro-lens comprises a convex surface and a flat surface; the convex surface is arranged at a side of the flat surface facing away from the light-transmitting hole;
wherein the light restriction layer further comprises a plurality of support layers alternately arranged with the diaphragm layers;
the aperture D1 of the first light-transmitting hole satisfies a following relationship:

OG Complex Work Unit Math
wherein, D represents an aperture of the micro-lens, hs represents a height of the micro-lens, n represents a refractive index of the micro-lens, nx represents a refractive index of at least one of the plurality of support layers, and θ represents a light receiving angle.