Ambient light sensor

Patent metadata

Field	Value
Publication number	US-10088359-B2
Application number	US-201715825557-A
Country	US
Kind code	B2
Filing date	Nov 29, 2017
Priority date	Aug 10, 2016
Publication date	Oct 2, 2018
Grant date	Oct 2, 2018

Abstract

Presented here are devices and methods to correct ambient light measurements made in the presence of optical elements, such as the curved edge of the cover glass associated with the mobile device. In one embodiment, a film with optical properties is placed within the ambient light sensor to diffuse the high-intensity light beam coming from the optical element. In another embodiment, an aperture associated with the ambient light sensor is disposed to prevent the high-intensity light beam from entering the ambient light sensor. In another embodiment, a processor coupled to the ambient light sensor smooths the peak associated with the high intensity light beam produced by the optical element.

First claim

What is claimed:

1. An apparatus comprising:
a light sensor that measures light intensity;
a light focusing element comprising a focusing surface positioned proximate to the light sensor, the light focusing element to receive light and to focus light onto the light sensor;
a processor coupled to the light sensor, the processor configured to:
receive a signal from the light sensor comprising a peak corresponding to light focused onto the light sensor by the light focusing element;
determine a plurality of points associated with the signal such that the plurality of points are outside the peak associated with the signal;
replace the peak with a plurality of values interpolated based on the plurality of points to produce a smooth signal; and
based on the smooth signal, determine light intensity.

2. The apparatus of claim 1 , the light sensor comprising an ambient light sensor.

3. The apparatus of claim 1 , the peak comprising a high frequency.

4. The apparatus of claim 3 , the processor configured to smooth the peak comprising the processor configured to:
perform a low-pass filter operation on the signal to remove the high frequency corresponding to the peak and to produce the smooth signal.

5. The apparatus of claim 1 , the light focusing element comprising a substantially curved portion of a cover glass associated with an electronic display.

6. The apparatus of claim 1 , the signal correlating an incident angle of light to light intensity, the incident angle of light defined with respect to the light sensor.

7. The apparatus of claim 1 , the plurality of values defining a second plurality of points axially symmetric with the plurality of points.

8. A method comprising:
receiving a signal from a light sensor, wherein the signal correlates an incident angle to light intensity, wherein the signal comprises a peak corresponding to incoming light focused by a light focusing element;
determining a plurality of points associated with the signal such that the plurality of points are outside the peak associated with the signal;
replacing the peak with values interpolated based on the plurality of points to produce a smooth signal; and
based on the smooth signal determining light intensity.

9. The method of claim 8 , said replacing the peak comprising interpolating a plurality of values between at least two points associated with the signal and proximate to the peak.

10. The method of claim 8 , wherein the peak comprises a high frequency; said replacing the peak comprising:
performing a low-pass filter operation on the signal to remove the high frequency corresponding to the peak and to produce the smooth signal.

Assignees

• Essential Products Inc

Inventors

• Evans V David John
• Jiang Xinrui
• Rubin Andrew E
• Hershenson Matthew
• Miao Xiaoyu
• Tate Joseph Anthony
• Gagne-Keats Jason Sean
• Zavin Rebecca Schultz

Classifications

• G01J1/0214

  Constructional arrangements for removing stray light · CPC title

• G01J1/4204 Primary

  with determination of ambient light (solar light G01J2001/4266) · CPC title

• G01J1/44 Primary

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

• G01J2001/4433

  Peak sensing · CPC title

• G01J1/0437

  using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters · CPC title