A display device comprising: a pixel array comprising a plurality of pixels (12; 512), each of the pixels comprising a plurality of sub-pixels (14; 506); a black matrix located between the sub-pixels (14; 506); and an optical sensing array over the black matrix, the optical sensing array comprising a row conductor (54; 508), and a column conductor that crosses the row conductor (54; 508) at a crossing region,wherein the optical sensing array further comprises: a sensing diode (64; 502) for every four pixels (12; 512) of the pixel array, wherein the sensing diode is coupled to the row conductor (54; 508) and to the column conductor at the crossing region, wherein the sensing diode (64; 502) is configured to generate current in response to light incident on the sensing diode (64; 502) and an anode of the sensing diode (64; 502) is coupled to the column conductor; and one blocking diode (62; 504) for every four pixels (12; 512) of the pixel array, wherein the blocking diode (62; 504) is coupled to the row conductor (54; 508) and to the column conductor at the crossing region, and coupled in series with the sensing diode (64; 502), wherein a cathode of the blocking diode (62; 504) faces a cathode of the sensing diode (64; 502) and an anode of the blocking diode (62; 504) is coupled to the row conductor (54; 508), wherein the sensing diode (64; 502) is provided between each sub-pixel (14; 506) of a top-right, a top-left, a bottom-left, and a bottom-right pixels (12; 512), and between the top-left and top-right pixels (12; 512), and between the top-left and bottom-left pixels (12; 512), and between the top-right and bottom-right pixels (12; 512), and wherein the blocking diode (62; 504) is provided adjacent the sensing diode (64; 502) between the bottom-left and the bottom-right pixels (12; 512), and wherein the sensing diode (62; 504) and the blocking diode (64; 502) are not provided over an active region of each sub-pixel (14; 506). a pixel array comprising a plurality of pixels (12; 512), each of the pixels comprising a plurality of sub-pixels (14; 506); a black matrix located between the sub-pixels (14; 506); and an optical sensing array over the black matrix, the optical sensing array comprising a row conductor (54; 508), and a column conductor that crosses the row conductor (54; 508) at a crossing region,wherein the optical sensing array further comprises: a sensing diode (64; 502) for every four pixels (12; 512) of the pixel array, wherein the sensing diode is coupled to the row conductor (54; 508) and to the column conductor at the crossing region, wherein the sensing diode (64; 502) is configured to generate current in response to light incident on the sensing diode (64; 502) and an anode of the sensing diode (64; 502) is coupled to the column conductor; and one blocking diode (62; 504) for every four pixels (12; 512) of the pixel array, wherein the blocking diode (62; 504) is coupled to the row conductor (54; 508) and to the column conductor at the crossing region, and coupled in series with the sensing diode (64; 502), wherein a cathode of the blocking diode (62; 504) faces a cathode of the sensing diode (64; 502) and an anode of the blocking diode (62; 504) is coupled to the row conductor (54; 508), a sensing diode (64; 502) for every four pixels (12; 512) of the pixel array, wherein the sensing diode is coupled to the row conductor (54; 508) and to the column conductor at the crossing region, wherein the sensing diode (64; 502) is configured to generate current in response to light incident on the sensing diode (64; 502) and an anode of the sensing diode (64; 502) is coupled to the column conductor; and one blocking diode (62; 504) for every four pixels (12; 512) of the pixel array, wherein the blocking diode (62; 504) is coupled to the row conductor (54; 508) and to the column conductor at the crossing region, and coupled in series with the sensing diode (64; 502), wherein a cathode of the blocking diode (62; 504) faces a cathode of the sensing diode (64; 502) and an anode of the blocking diode (62; 504) is coupled to the row conductor (54; 508), wherein the sensing diode (64; 502) is provided between each sub-pixel (14; 506) of a top-right, a top-left, a bottom-left, and a bottom-right pixels (12; 512), and between the top-left and top-right pixels (12; 512), and between the top-left and bottom-left pixels (12; 512), and between the top-right and bottom-right pixels (12; 512), and wherein the blocking diode (62; 504) is provided adjacent the sensing diode (64; 502) between the bottom-left and the bottom-right pixels (12; 512), and wherein the sensing diode (62; 504) and the blocking diode (64; 502) are not provided over an active region of each sub-pixel (14; 506).