Method and device for detecting ambient light, and storage medium

Patent metadata

Field	Value
Publication number	US-11250791-B2
Application number	US-202016886655-A
Country	US
Kind code	B2
Filing date	May 28, 2020
Priority date	Jan 3, 2020
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

A first brightness value and a second brightness value are determined. The first brightness value relates to display performed by the display during a display time window. The second brightness value relates to an off state of the display during an off time window. The display is off during the off time window. A first drop depth value is determined according to the first brightness value and the second brightness value. A second ambient brightness value is acquired by adjusting a first ambient brightness value detected by the light sensor based on a brightness adjusting model acquired under predetermined ambient light and the first drop depth value.

First claim

What is claimed is:

1. A method for detecting ambient light, the method comprising:
determining, by a mobile User Equipment (UE) comprising a display and a light sensor, a first brightness value during a display time window and a second brightness value during an off time window, wherein the first brightness value is obtained by the light sensor in a display state of the display during the display time window, the second brightness value is obtained by the light sensor in an off state of the display during the off time window, the display is off during the off time window;
determining a first drop depth value according to the first brightness value and the second brightness value; and
acquiring a second ambient brightness value by adjusting a first ambient brightness value detected by the light sensor based on a brightness adjusting model acquired under predetermined ambient light and the first drop depth value,
wherein the brightness adjusting model is acquired under the predetermined ambient light by:
determining, under the predetermined ambient light, a third brightness value and a fourth brightness value, the third brightness value relating to display performed by the display during the display time window, the fourth brightness value relating to the off state of the display during the off time window;
determining a second drop depth value according to the third brightness value and the fourth brightness value; and
determining the brightness adjusting model for adjusting the first ambient brightness value according to the second drop depth value and a third ambient brightness value under the predetermined ambient light.

2. The method of claim 1 , wherein the display has M display brightness levels, wherein the M is a positive integer,
wherein the determining, under the predetermined ambient light, the third brightness value and the fourth brightness value comprises:
determining, under the predetermined ambient light, an mth third brightness value and an mth fourth brightness value, the mth third brightness value relating to display performed by the display at an mth display brightness level during the display time window, the mth fourth brightness value relating to the off state of the display during the off time window after the display has performed display at the mth display brightness level, the m being a positive integer no greater than the M,
wherein the determining the second drop depth value according to the third brightness value and the fourth brightness value comprises:
determining an mth second drop depth value according to the mth third brightness value and the mth fourth brightness value,
wherein the determining the brightness adjusting model for adjusting the first ambient brightness value according to the second drop depth value and the third ambient brightness value under the predetermined ambient light comprises:
determining the brightness adjusting model for adjusting the first ambient brightness value based on a first second drop depth value to an Mth second drop depth value, and the third ambient brightness value under the predetermined ambient light.

3. The method of claim 2 , wherein the determining the brightness adjusting model for adjusting the first ambient brightness value based on the first second drop depth value to the Mth second drop depth value, and the third ambient brightness value under the predetermined ambient light comprises:
acquiring the brightness adjusting model by performing data fitting on the first second drop depth value to the Mth second drop depth value, and the third ambient brightness value under the predetermined ambient light,
wherein the acquiring the second ambient brightness value by adjusting the first ambient brightness value detected by the light sensor based on the brightness adjusting model acquired under the predetermined ambient light and the first drop depth value comprises:
acquiring an adjustment value by inputting the first drop depth value to the brightness adjusting model; and
acquiring the second ambient brightness value by adjusting the first ambient brightness value using the adjustment value.

4. The method of claim 3 , wherein the acquiring the brightness adjusting model by performing data fitting on the first second drop depth value to the Mth second drop depth value, and the third ambient brightness value under the predetermined ambient light comprises:
acquiring S alternative functions for the brightness adjusting model corresponding respectively to S fitting modes by performing, in the S fitting modes, data fitting on at least two second drop depth data of the first second drop depth value to the Mth second drop depth value;
acquiring S outputs output by the S alternative functions by inputting the at least two second drop depth data respectively to the S alternative functions;
determining a difference between the fourth brightness value and the third ambient brightness value under the predetermined ambient light; and
determining an alternative function with an output differing the least from the difference as the brightness adjusting model.

5. The method of claim 1 , wherein the light sensor has p light sensing channels, wherein the p is a positive integer, wherein the first brightness value comprises p first brightness values detected by the p light sensing channels, wherein the second brightness value comprises p second brightness values detected by the p light sensing channels, wherein the determining the first drop depth value according to the first brightness value and the second brightness value comprises:
respectively determining p brightness differences between the p first brightness values and the p second brightness values detected by the p light sensing channels according to the first brightness value and the second brightness value;
determining a weighted average of the p brightness differences according to the p brightness differences and weighting factors of the p light sensing channels; and
determining the first drop depth value according to the weighted average.

6. The method of claim 1 , wherein the first brightness value comprises n first brightness values relating respectively to n images displayed by the display during the display time window, wherein the second brightness value comprises n second brightness values relating respectively to the n images when the display is in the off state during the off time window,
wherein the determining the first drop depth value according to the first brightness value and the second brightness value comprises:
respectively determining n brightness differences between the n first brightness values and the n second brightness values according to the first brightness value and the second brightness value; and
determining the first drop depth value according to an average of the n brightness differences.

7. The method of claim 1 , further comprising:
acquiring a set of brightness data collected within a display cycle at a preset sampling frequency, wherein the preset sampling frequency is no less than twice a refreshing frequency corresponding to the display cycle, wherein the display cycle comprises the display time window and the off time window,
wherein the determining the second brightness value comprises:
determining a minimum brightness value of the set of brightness data as the second brightness value.

8. The method of claim 7 , wherein the determining the first brightness value comprises:
determining an average of brightness data in the set of brightness data other than the minimum brightness value; and
determining the average as the first brightness value.

9. The method of claim 1 , further comprising:
acquiring a set of brightness data collected within a

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Chen Chaoxi

Classifications

• G09G3/34

  by control of light from an independent source · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G2360/144

  the light being ambient light · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title