Screen state control method, device, and mobile terminal

A screen state control device, comprising:

• a ratio determining module configured to determine a ratio of a characteristic curve of a proximity sensor to an ideal curve of the proximity sensor in each of a plurality of intervals, wherein the characteristic curve of the proximity sensor reflects a relationship between an infrared intensity value input to an analog to digital converter and a proximity value of the analog to digital converter output;
• a signal compensation module configured to obtain a first intensity value of a receiving end signal when a transmitting end of the proximity sensor is turned on, and obtain a second intensity value of a receiving end signal when the transmitting end of the proximity sensor is turned off, and to compensate the first intensity value and the second intensity value respectively according to a ratio corresponding to an interval where the first intensity value belongs to and a ratio corresponding to an interval where the second intensity value belongs to;
• and
• a first screen control module configured to determine a corrected proximity value of the proximity sensor according to a compensated first intensity value and a compensated second intensity value, and to control the state of backlight of the screen, according to a comparison result between the corrected proximity value and a preset threshold;
• wherein the ratio determining module is configured to:
• divide the characteristic curve of the proximity sensor into a plurality of line segments by the plurality of intervals, and divide the ideal curve of the proximity sensor into a plurality of line segments by the plurality of intervals, wherein the plurality of intervals each has an equal length;
• determine a first difference between two endpoints of each of the plurality of line segments of the characteristic curve, and a second difference between two end points of the plurality of line segments of the ideal curve, respectively;
• and
• determine the ratio of the characteristic curve to the ideal curve in each of the plurality of intervals, according to a ratio of the first difference value to the second difference value in each of the plurality of intervals.

A mobile terminal comprising a memory, a processor, and a computer program stored therein and executable on the processor, the processor executing the computer program to implement a method comprising the steps of:

• determining, a ratio of a characteristic curve of a proximity sensor to an ideal curve of the proximity sensor in each of a plurality of intervals;
• obtaining a first intensity value of a receiving end signal when a transmitting end of the proximity sensor is in a first state, obtaining a second intensity value of a receiving end signal when the transmitting end of the proximity sensor is in a second state different fron the first state, and respectively compensating the first intensity value and the second intensity value respectively according to the ratio;
• and
• determining a corrected proximity value of the proximity sensor according to a compensated first intensity value and a compensated second intensity value, and controlling a screen, according to a comparison result between the corrected proximity value and a preset threshold, to be selectively in a screen on state or a screen off state;
• wherein determining a ratio of a characteristic curve of the proximity sensor to an ideal curve in each of a plurality of intervals comprises:
• dividing the characteristic curve of the proximity sensor into a plurality of first line segments by the plurality of intervals, and dividing the ideal curve of the proximity sensor into a plurality of second line segments by the plurality of intervals, wherein the plurality of intervals each has an equal length;
• obtaining first patterns formed by each of the first line segments of the characteristic curve and an orthographic projection of each of the first line segments of the characteristic curve on the abscissa axis;
• obtaining second patterns formed by each of the second line segments of the ideal curve and an orthographic projection of each of the second line segments of the ideal curve on the abscissa axis;
• and
• determining the ratio of the characteristic curve to the ideal curve in each of the plurality of the intervals according to an area ratio of the first pattern to the second pattern in each of the plurality of the intervals.