Method and device for calibrating ambient light sensor

A technology of ambient light sensor and calibration value, which is applied in the field of calibration, can solve problems such as poor brightness adjustment of the display screen, and achieve the effect of avoiding errors and improving accuracy

Active Publication Date: 2018-07-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method and device for calibrating an ambient light sensor, which is used to solve the problem in

Method used

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  • Method and device for calibrating ambient light sensor
  • Method and device for calibrating ambient light sensor

Examples

Experimental program
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Embodiment 1

[0023] This embodiment provides a method for calibrating an ambient light sensor. figure 1 is a flowchart of a method for calibrating an ambient light sensor according to the first embodiment of the present invention.

[0024] Step S110, determining the illuminance range according to the preset standard illuminance, standard transmittance and transmittance tolerance.

[0025] Standard transmittance refers to the standard transmittance of the terminal IR aperture. The transmittance tolerance refers to the tolerance of the transmittance. In this embodiment, the ambient light sensor is arranged in the terminal to measure the illuminance of the light passing through the IR hole of the terminal, and the terminal adjusts the brightness of the display screen according to the illuminance. The IR hole consists of a part of the display glass cover and a layer of black semi-transparent film, so the IR hole is light-transmitting. When producing the terminal, the transmittance of the IR...

Embodiment 2

[0044] This embodiment provides a device for calibrating an ambient light sensor. figure 2 is a structural diagram of an apparatus for calibrating an ambient light sensor according to a second embodiment of the present invention. The device is arranged on the terminal side.

[0045] The unit includes:

[0046] The determination module 210 is configured to determine the illuminance range according to the preset standard illuminance, standard transmittance and transmittance tolerance.

[0047] The setting module 220 is configured to divide the illuminance range into multiple illuminance intervals, and set corresponding weights for each illuminance interval.

[0048] An acquisition module 230, configured to acquire a predetermined amount of illuminance measured by the ambient light sensor.

[0049] The determining module 210 is further configured to determine the illuminance interval in which each illuminance is located, and determine the illuminance interval in which the ill...

Embodiment 3

[0056] A more specific embodiment is provided below to illustrate the method for calibrating the ambient light sensor and the method for adjusting the brightness of the display screen of the present invention. image 3 is a structural diagram of calibrating an ambient light sensor according to a third embodiment of the present invention.

[0057] Determine Calibration Value Phase:

[0058] Use a fixed light source to simulate strong outdoor light, and the fixed light source illuminates the terminal display so that the illuminance on the surface of the terminal display is 5000 lux.

[0059] The configuration module is based on a standard light transmittance of 10%, and a standard illuminance of 500lux can be obtained. When the light transmittance tolerance is -5%, the light transmittance is 5% (10%+(-5%)=5%), and one end value of the illuminance range is 250lux. When the light transmittance is +5%, the light transmittance is 15% (10%+(+5%)=15%), and the other end value of the...

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Abstract

The invention discloses a method and device for calibrating an ambient light sensor. The method comprises the steps of determining an illumination range according to the preset standard illumination,the standard transmittance and the transmittance tolerance; dividing the illumination range into a plurality of illuminance intervals, and setting corresponding weights for the illumination intervals;obtaining a predetermined number of illumination intensities measured by the ambient light sensor; determining the illumination interval where each illumination intensity is located, and determiningan illumination interval with the most accumulative illumination intensities; enabling the weight corresponding to the illumination interval with the most accumulative illumination intensities to serve as a calibration value, and calibrating the illumination intensity measured by the ambient light sensor according to the calibration value. According to the invention, calibration is performed on the ambient light sensor, that is, calibration is performed on the illumination intensity measured by the ambient light sensor, so that the accuracy of brightness adjustment of a display screen is improved. A problem that the transmittance tolerance is easy to introduce an error is considered in the process of determining the calibration value, so that the error introduced by the transmittance tolerance is avoided.

Description

technical field [0001] The invention relates to the technical field of calibration, in particular to a method and device for calibrating an ambient light sensor. Background technique [0002] The terminal needs to adjust the brightness of the display screen according to the brightness of the ambient light. At present, when the ambient light illuminates the terminal, the terminal usually uses an ambient light sensor to measure the illuminance, and adjusts the brightness of the display screen based on the measured illuminance. When measuring illuminance, light is irradiated to the ambient light sensor through an IR (Infrared Radiation, infrared) hole, and the AR hole includes a part of the display glass cover and a layer of semi-transparent film. The translucent film is generally black and is used to hide the internal components of the terminal. The light transmittance requirement of the black semi-transparent film is 10%, but the light transmittance tolerance is plus or minu...

Claims

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Application Information

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IPC IPC(8): G01J1/00
CPCG01J1/00G09G3/34G09G5/10
Inventor 张晓亮刘辉冯磊吴宏超孙卫山
Owner ZTE CORP
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