Display device with embedded biometric detection function in active region

A display device comprising:

• a display panel having a plurality of pixels that are configured to display an image, wherein the plurality of pixels comprise a plurality of display and photo sensing pixels that are arranged in a plurality of photo sensing channels, each of the plurality of display and photo sensing pixels comprising:
• a display region configured to emit light;
• and
• a photo sensing region adjacent to the display region, the photo sensing region configured to detect the light emitted by the display region and reflected from a biometric object and to convert the reflected light into photo detection signals;
• and
• a detection circuit comprising:
• a plurality of first differential signal processing circuitries that are coupled to the photo sensing regions of the display and photo sensing pixels, each of the first differential signal processing circuitries configured to perform a differential operation on the photo detection signals of adjacent two of the photo sensing channels to generate a difference signal that is used to construct a biometric pattern corresponding to the biometric object;
• a second differential signal processing circuitry configured to perform a differential operation on a voltage reference signal and the photo detection signal of the first photo sensing channel of the photo sensing channels to generate a first output reference signal for constructing the biometric pattern;
• and
• an accumulator that is configured to perform accumulative operations on the first output reference signal and the difference signals to restore the photo detection signals relative to the voltage reference signal.