Display device including detection sensor and method of manufacturing the detection sensor

A method of manufacturing a detection sensor, comprising:

• forming a biometric information sensing layer comprising a transistor on a base layer;
• forming an initial optical pattern layer on the biometric information sensing layer;
• patterning the initial optical pattern layer to form a plurality of transmissive portions spaced apart from each other and having a negative (−) zeta potential;
• coating a light blocking material to form an initial light blocking portion that covers a side surface and an upper surface of the transmissive portions and has a positive (+) zeta potential;
• spraying an abrasive having the negative (−) zeta potential on the initial light blocking portion;
• and
• polishing the initial light blocking portion such that the upper surface of the transmissive portions is exposed to form a light blocking portion, wherein the initial light blocking portion is polished by the abrasive using a pad.

A method of manufacturing a detection sensor, comprising:

• forming a biometric information sensing layer comprising a transistor on a base layer;
• forming an initial optical pattern layer on the biometric information sensing layer;
• patterning the initial optical pattern layer to form a plurality of transmissive portions spaced apart from each other;
• coating a light blocking material to form an initial light blocking portion that covers a side surface and an upper surface of the transmissive portions;
• spraying an abrasive on the initial light blocking portion;
• and
• polishing the initial light blocking portion to form a light blocking portion, wherein the abrasive comprises about 0.005 wt % of polyacrylic acid (PAA) and about 0.005 wt % of polystyrene sulfonate (PSS) or comprises about 0.005 wt % of polyacrylic acid (PAA) and about 0.007 wt % of polystyrene sulfonate (PSS), and the initial light blocking portion is polished by the abrasive using a pad.

A display device comprising:

• a display module comprising a pixel;
• and
• a detection sensor disposed under the display module and comprising a base layer, a biometric information sensing layer disposed on the base layer, an optical pattern layer disposed on the biometric information sensing layer, and a sensing insulating layer disposed on the optical pattern layer, the optical pattern layer comprising:
• a plurality of transmissive portions providing a light incident thereto through the display module from an outside to the biometric information sensing layer ;
• and
• a light blocking portion surrounding the transmissive portions, wherein an upper surface of each of the transmissive portions is in contact with the sensing insulating layer.