Device having reduced optical crosstalk

Patent metadata

Field	Value
Publication number	US-2025164311-A1
Application number	US-202318838966-A
Country	US
Kind code	A1
Filing date	Feb 9, 2023
Priority date	Feb 15, 2022
Publication date	May 22, 2025
Grant date	—

Abstract

A device comprising a display and a sensor is disclosed. The display comprises a plurality structures in a regular arrangement. The sensor comprises a radiation-sensitive device and radiation-emitting device arranged on a first axis. The display is configured to scatter a portion of radiation emitted by the radiation-emitting device with an intensity profile defined by the regular arrangement, the intensity profile having a first region of peak intensity extending along at least a second axis different to the first axis. Also disclosed is a method of reducing crosstalk in such a device.

First claim

1 . A device comprising:
a display comprising a plurality structures in a regular arrangement; and a radiation-sensitive device and a radiation-emitting device arranged on a first axis; wherein the display is configured to scatter a portion of radiation emitted by the radiation-emitting device with an intensity profile defined by the regular arrangement, the intensity profile having a first region of peak intensity extending along at least a second axis different to the first axis.

2 . The device of claim 1 , wherein the first axis is rotated relative to the second axis such that the radiation-sensitive device is substantially outside the region of peak intensity.

3 . The device of claim 1 , wherein the first axis is rotated relative to the second axis such that the radiation-sensitive device is within a region of minimum intensity.

4 . The device of claim 1 , wherein the first axis is rotated relative to the second axis by an angle of substantially +/−45 degrees.

5 . The device of claim 1 wherein the intensity profile has a second region of peak intensity extending along a third axis substantially orthogonal to the second axis.

6 . The device of claim 1 wherein the radiation-sensitive device and the radiation-emitting device are disposed behind the display and configured as a sensor for sensing one or more characteristics of a target disposed in front of the display.

7 . The device of claim 6 , wherein the sensor is configured as one of:
a proximity sensor; a direct Time-of-Flight sensor; an indirect Time-of-Flight sensor; a gas sensor; a spectral sensor; a sensor for health monitoring applications.

8 . The device of claim 1 , wherein:
the regular arrangement of structures is configured to anisotropically reflect and/or scatter the portion of radiation emitted by the radiation-emitting device to provide the reflected/scattered portion of radiation with the intensity profile; and/or the regular arrangement corresponds to a grid, array, lattice and/or periodic pattern of the plurality of structures.

9 . The device according to claim 1 , wherein the first region of peak intensity, and when dependent on claim 5 also the second region of peak intensity, comprises a plurality of maxima and minima due to diffraction of the portion of radiation by the display.

10 . The device of claim 1 , wherein the plurality of structures comprise Organic Light Emitting Diodes (OLEDs) and/or micro-Light Emitting Diodes (μLEDs).

11 . The device of claim 1 , wherein the radiation-sensitive device and the radiation-emitting device are provided as a packaged device.

12 . A method of reducing crosstalk between a radiation-sensitive device and a radiation-emitting device arranged on a first axis,
wherein a display comprises a plurality of structures in a regular arrangement, the display configured to scatter a portion of radiation emitted by the radiation-emitting device with an intensity profile defined by the regular arrangement, the intensity profile having a first region of peak intensity extending along at least a second axis, the method comprising: positioning the radiation-sensitive device relative to the display such that the second axis is different to the first axis.

13 . The method of claim 12 , comprising providing the first axis rotated relative to the second axis such that the crosstalk is minimised.

14 . The method of claim 12 , comprising providing the first axis rotated relative to the second axis such that the crosstalk is below a maximum level and above a minimum threshold level.

15 . The method of claim 14 , wherein the radiation-sensitive device and the radiation-emitting device are configured as a sensor, the method comprising a step of calibration of the sensor, wherein the minimum threshold level defines an amount of crosstalk required for calibration of the sensor.

Assignees

• Ams Int Ag

Inventors

• Malkmus Stephan
• Muschick Sebastian
• Hirmer Michael
• Jacobs Dan

Classifications

• G01J2001/444

  Compensating; Calibrating, e.g. dark current, temperature drift, noise reduction or baseline correction; Adjusting · CPC title

• G01J1/44 Primary

  Electric circuits {(for command of an exposure part G03B7/02)} · CPC title

• G09G3/32 Primary

  semiconductive, e.g. using light-emitting diodes [LED] · CPC title