In some examples, the plurality of second sensors 316 may correspond to at least one of a photodetector, a photodiode, or a photo resistor that may detect the plurality of light signals received from an ambient environment of the display screen 110 (e.g., external light source). In such an example, the plurality of second sensors 316 may be configured to detect the plurality of light signals that originate in the ambient environment around the display screen 110 and that passes through the glass substrate layer 306 and the touch panel 304. Therefore, the intensity of the plurality of light signals detected by the plurality of second sensors 316 is dependent on a transmissivity of the glass substrate layer 306 and the touch panel 304 (hereinafter referred to as the transmissivity of the display screen 110). In an example embodiment, the transmissivity of the display screen 110 may correspond to a measurement of the intensity of a light signal that the display screen 110 allows to pass through. Because the measurement of the one or more characteristics associated with each of the plurality of second signals is indicative of the intensity of the light signal detected by the plurality of second sensors 316, the measurement of the one or more characteristics associated with the plurality of the second signals corresponds to the transmissivity measurement of the display screen 110.