US 12,449,940 B2
Photo-sensing enabled display for stylus detection
Mohammad Yeke Yazdandoost, San Francisco, CA (US); and Christopher J. Butler, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 6, 2023, as Appl. No. 18/462,330.
Claims priority of provisional application 63/496,258, filed on Apr. 14, 2023.
Claims priority of provisional application 63/377,003, filed on Sep. 23, 2022.
Prior Publication US 2024/0118773 A1, Apr. 11, 2024
Int. Cl. G06F 3/042 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/0425 (2013.01) [G06F 3/0412 (2013.01); G06F 3/0421 (2013.01); G06F 3/0428 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An integrated touch screen for performing display operations and optical object sensing, comprising:
a cover material having a detection surface;
an array of photodetectors, including a first photodetector, arranged below the cover material;
a first light-blocking layer, including a first light-blocking element corresponding to the first photodetector, arranged between the array of photodetectors and the cover material, the first light-blocking layer including a first plurality of apertures configured as detector angular filters for blocking light having a detection angle less than a first critical angle from impinging on the photodetectors; and
an array of illuminators, including a first illuminator, arranged below the cover material, the first light-blocking layer further including a second light-blocking element corresponding to the first illuminator, and a second plurality of apertures configured as illuminator angular filters for blocking light, emitted by the illuminators, having an illumination angle greater than a second critical angle, different from the first critical angle, from impinging on the cover material,
wherein:
the first light-blocking element is offset from the first photodetector, toward the cover material, and the first light-blocking element comprises an annular structure, and
the first critical angle is determined in accordance with the cover material and a first medium in contact with the cover material, and is defined with respect to a normal to the detection surface.