Biometric imaging device comprising color filters and method of imaging using the biometric imaging device

Method of biometric imaging in a display arrangement comprising a display panel with an array of light emitting elements and an optical biometric imaging device, the optical biometric imaging device comprising:

• an image sensor comprising a plurality of photodetector pixels;
• a lens arrangement comprising at least one lens configured to focus light reflected by a biometric object onto the image sensor;
• an aperture layer arranged between an object to be imaged and the image sensor, wherein the aperture layer comprises an aperture configured to limit the amount of light reaching the image sensor;
• a filter element arranged in the aperture and configured to block light within a first wavelength range, wherein an area of the filter element is smaller than an area of the aperture so that a portion of light within the first wavelength range reaching the aperture layer pass through the aperture, wherein the method comprises:
• controlling least a portion of the display corresponding to a location of the biometric imaging to operate in a first biometric imaging mode to emit light comprising wavelengths within the first wavelength range or in a second biometric imaging mode to emit light comprising wavelengths outside of the first wavelength range;
• and
• by the image sensor, capturing an image of a biometric object illuminated with light emitted by the display.