Terminal and method for detecting luminance of ambient light

A terminal, comprising:

• a screen;
• an ambient light sensor, wherein a light-sensitive element of the ambient light sensor faces the screen and is located on a lower surface of the screen;
• and
• a processor coupled to the screen and the ambient light sensor and configured to:
• repeatedly control image data within a visual persistence time of human eyes after the screen is lit up to make a grayscale value of the controlled image data is less than or equal to a first threshold;
• and
• average two or more consecutive values of luminance of first ambient light to produce an average luminance of the first ambient light when the two or more consecutive values of the luminance of the first ambient light are within a second threshold,
• wherein the ambient light sensor is configured to detect luminance of first ambient light of the terminal within the visual persistence time of human eyes.

A method for detecting luminance of ambient light, comprising:

• adjusting, by a terminal, first luminance of a screen to a value below a first threshold within a visual persistence time of human eyes after the screen of the terminal is lit up;
• detecting, by an ambient light sensor of the terminal, luminance of first ambient light of the terminal within the visual persistence time of human eyes;
• and
• average two or more consecutive values of luminance of the first ambient light to produce an average luminance of the first ambient light when the two or more consecutive values of the luminance of the first ambient light are within a second threshold.