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Semiconductor device and driving method of the same

  • US 10,222,911 B2
  • Filed: 04/02/2014
  • Issued: 03/05/2019
  • Est. Priority Date: 04/12/2013
  • Status: Active Grant
First Claim
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1. A semiconductor device comprising:

  • a display portion comprising a plurality of pixels, each pixel comprising;

    a display element, the display element comprising;

    a first transistor;

    a first storage capacitor electrically connected to the first transistor;

    anda liquid crystal element electrically connected to the first transistor,a first ultrasonic wave transmitter configured to output a first ultrasonic wave;

    a second ultrasonic wave transmitter configured to output a second ultrasonic wave;

    a first ultrasonic wave receiver configured to detect the first ultrasonic wave reflected by an object;

    a second ultrasonic wave receiver configured to detect the second ultrasonic wave reflected by the object;

    an arithmetic unit configured to calculate a distance between the display portion and the object based on the first ultrasonic wave and the second ultrasonic wave detected by the first ultrasonic wave receiver and the second ultrasonic wave receiver,wherein the first ultrasonic wave receiver includes a first plurality of ultrasonic wave sensors arranged in a first direction,wherein the second ultrasonic wave receiver includes a second plurality of ultrasonic wave sensors arranged in a second direction different from the first direction,wherein a location of the object is identified with a photosensor or the first plurality of ultrasonic wave sensors and the second plurality of ultrasonic wave sensors,wherein the location of the object is solely identified with the photosensor where an illuminance is higher than or equal to a reference illuminance, andwherein the location of the object is solely identified with the first plurality of ultrasonic wave sensors and the second plurality of ultrasonic wave sensors where the illuminance is lower than the reference illuminance.

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