Patent ID: 8537339

Claim:
A method of performing distance measurement, comprising: utilizing a light source to transmit detecting light toward an object, wherein the detecting light is reflected by a surface of the object to form reflected light; utilizing a sensor to sense the reflected light; performing luminance convergence on the reflected light according to luminance of the reflected light sensed by the sensor, wherein performing the luminance convergence on the reflected light comprises: increasing exposure time of the sensor until a predetermined time when the luminance of the reflected light sensed by the sensor is too low, and meanwhile switching a sensing mode of the sensor to a high sensitivity mode and adjusting the exposure time of the sensor down from the predetermined time to an adjusting value, then amplifying a light signal sensed by the sensor when the exposure time is increased from the adjusting value to the maximum exposure time of the sensor; and increasing supply current of the light source before increasing the exposure time of the sensor for increasing the luminance of the detecting light and the luminance of the reflected light; and detecting a distance between the object and the light source and/or the sensor according to an image position of the reflected light on the sensor.