Method for operating bi-directional display

A method for operating a bidirectional display comprising a substrate, on which a display array comprising a plurality of light-generating image elements and a sensor array comprising a plurality of light-detecting elements are formed, each light-detecting element being assigned at least one of the light-generating image elements, and each light-detecting element including at least a photodetector, a reset switch, a transfer switch, a memory, and a select switch, the method comprising:

• subdividing an exposure phase of a light-detecting element between two successive readout phases of the light-detecting element into at least two exposure subphases chronologically separated from one another;
• activating, at least temporarily between the two exposure subphases of the light-detecting element, the at least one of the light-generating image elements assigned to the light-detecting element;
• and
• carrying out, after an initial instant at which the reset switch and the transfer switch are closed and the select switch is opened, the following phases:
• a) a reset phase, which ends with a first opening of the reset switch;
• b) an exposure subphase, which starts with the first opening of the reset switch and ends with a first opening of the transfer switch;
• c) an emit phase, in which the at least one of the light-generating elements is activated;
• d) a reset phase, which starts with a first closure of the reset switch and ends with a second opening of the reset switch;
• e) an exposure subphase, which starts with a first closure of the transfer switch and ends with a second opening of the transfer switch;
• f) an emit phase, in which the at least one of the light-generating elements is activated;
• and
• g) a readout phase, which starts with a closure of the select switch and ends with an opening of the select switch.