Light sensor module, method for acquiring light sensor data, and electronic equipment

Patent metadata

Field	Value
Publication number	US-2021266483-A1
Application number	US-202016925784-A
Country	US
Kind code	A1
Filing date	Jul 10, 2020
Priority date	Feb 26, 2020
Publication date	Aug 26, 2021
Grant date	—

Abstract

A light sensor module includes a substrate. A first detection region is provided on the substrate. At least one photosensitive device is provided inside the first detection region. The at least one photosensitive device is adapted to collecting first light sensor data from the first detection region under current incident light. The first light sensor data are used for determining whether light sensor data collected by the light sensor module under the current incident light are to be compensated.

First claim

1 . A light sensor module, comprising a substrate, wherein:
a first detection region is provided on the substrate; at least one photosensitive device is provided in the first detection region; the at least one photosensitive device is configured to collecting first light sensor data from the first detection region under current incident light; and the light sensor module is configured to determine, based on the first light sensor data, whether light sensor data collected by the light sensor module under the current incident light are to be compensated.

2 . The light sensor module of claim 1 , wherein:
the substrate further comprises a second detection region; and the first detection region is provided outside the second detection region.

3 . The light sensor module of claim 2 , wherein:
the first detection region comprises at least one sub detection region; and the at least one sub detection region is provided respectively at a vertex of the second detection region.

4 . The light sensor module of claim 2 , wherein:
a number of photosensitive devices are provided inside the second detection region; and an area of a photosensitive device is greater than an area of a photosensitive device.

5 . The light sensor module of claim 4 , wherein:
the at least one photosensitive device comprises multiple photosensitive devices; gate lines of the multiple photosensitive devices are connected to each other; and data lines of the multiple photosensitive devices are connected to each other.

6 . The light sensor module of claim 1 , further comprising:
a readout integrated circuit (ROIC) and a compensating circuit provided at a front end of the ROIC; and the compensating circuit is adapted to compensating the light sensor data collected by the light sensor module under the current incident light.

7 . The light sensor module of claim 6 , wherein:
the compensating circuit comprises a current compensating circuit; the current compensating circuit comprises an operational amplifier, a feedback capacitor, a compensating current source, and a first switch, an inverting input of the operational amplifier is connected to a photosensitive device inside a second detection region, wherein a non-inverting input of the operational amplifier is grounded, wherein the feedback capacitor is connected in parallel between an output of the operational amplifier and the inverting input of the operational amplifier; and wherein the compensating current source is connected to the inverting input of the operational amplifier via the first switch.

8 . The light sensor module of claim 6 , wherein:
the compensating circuit comprises a voltage compensating circuit; the voltage compensating circuit comprises an operational amplifier, a feedback capacitor, a compensating voltage source, a second switch, and a compensating capacitor; an inverting input of the operational amplifier is connected to a photosensitive device inside a second detection region, wherein a non-inverting input of the operational amplifier is grounded, wherein the feedback capacitor is connected in parallel between an output of the operational amplifier and the inverting input of the operational amplifier; and a first end of the compensating capacitor is connected to the compensating voltage source, wherein a second end of the compensating capacitor is connected to the inverting input of the operational amplifier via the second switch.

9 . The light sensor module of claim 6 , wherein:
the compensating circuit comprises a voltage compensating circuit and a current compensating circuit; the voltage compensating circuit and the current compensating circuit share an operational amplifier and a feedback capacitor; the current compensating circuit further comprises a compensating current source and a first switch; the voltage compensating circuit further comprises a compensating voltage source, a compensating capacitor, and a second switch; an inverting input of the operational amplifier is connected to a photosensitive device inside a second detection region; a non-inverting input of the operational amplifier is grounded; the feedback capacitor is connected in parallel between an output of the operational amplifier and the inverting input of the operational amplifier; the compensating current source is connected to the inverting input of the operational amplifier via the first switch; a first end of the compensating capacitor is connected to the compensating voltage source; and a second end of the compensating capacitor is connected to the inverting input of the operational amplifier via the second switch.

10 . A method for acquiring light sensor data, comprising:
acquiring first light sensor data from a first detection region in a light sensor module under incident light; comparing the first light sensor data to a set threshold; and in response to determining that the first light sensor data exceed the set threshold, compensating light sensor data collected by the light sensor module.

11 . The method of claim 10 , wherein the compensating the light sensor data collected by the light sensor module comprises:
acquiring compensating data corresponding to the first light sensor data based on set-threshold-compensating-data correspondence; determining, based on the compensating data, compensating current or compensating voltage of a compensating circuit in the light sensor module; compensating, via the compensating circuit, second light sensor data collected by a photosensitive device inside a second detection region in the light sensor module; and setting compensated light sensor data as final detected light sensor data.

12 . The method of claim 10 , further comprising:
in response to determining that the first light sensor data are no greater than the set threshold, setting second light sensor data collected by a photosensitive device inside a second detection region in the light sensor module as final detected light sensor data.

13 . The method of claim 10 , wherein the compensating the light sensor data collected by the light sensor module comprises:
determining whether the first light sensor data meet a trigger condition; in response to determining that the trigger condition is met, triggering compensating, by a current compensating circuit, the light sensor data collected by the light sensor module; in response to determining that the trigger condition is not met, triggering compensating, by a voltage compensating circuit, the light sensor data collected by the light sensor module.

14 . The method of claim 10 , wherein the compensating the light sensor data collected by the light sensor module comprises:
triggering compensating, by a current compensating circuit, the light sensor data collected by the light sensor module.

15 . The method of claim 10 , wherein the compensating the light sensor data collected by the light sensor module comprises:
triggering compensating, by a voltage compensating circuit, the light sensor data collected by the light sensor module.

16 . The method of claim 10 , wherein the first detection region comprises multiple sub detection regions, wherein the acquiring the first light sensor data from the first detection region in the light sensor module under the incident light comprises:
simultaneously reading light sensor data collected by pixels inside the multiple sub detection regions; and determining maximal light sensor data as the first light sensor data.

17 . The method of claim 10 , wherein the first detection region comprises

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Cheng Chihjen

Classifications

• G01J1/4204 Primary

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

• H04N25/585

  with pixels having different sensitivities within the sensor, e.g. fast or slow pixels or pixels having different sizes · CPC title

• G01J2001/444

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

• G01J1/46

  using a capacitor · CPC title

• G01J1/4228 Primary

  arrangements with two or more detectors, e.g. for sensitivity compensation · CPC title