Color conversion substrate and related display device

A display device comprising:

• a display substrate;
• a first pixel electrode, a second pixel electrode and a third pixel electrode disposed on the display substrate;
• and
• a color conversion substrate overlapping the display substrate and configured to display a first color, a second color, and a third color,
• wherein the color conversion substrate comprises:
• a base substrate;
• a first light-blocking portion disposed on a surface of the base substrate facing the display substrate, overlapping the first pixel electrode, and configured to block first light of the third color;
• a second light-blocking portion disposed on the surface of the base substrate, overlapping the second pixel electrode, and configured to block second light of the third color;
• a pattern layer disposed on the first light-blocking portion and the second light-blocking portion and comprising a first optical pattern, wherein the first optical pattern comprises first-set protrusions protruding toward the display substrate;
• a first color conversion layer overlapping the first light-blocking portion and configured to convert a first portion of incident light into light of the first color;
• and
• a second color conversion layer overlapping the second light-blocking portion and configured to convert a second portion of the incident light into light of the second color,
• wherein a first-set protrusion of the first-set protrusions protrudes into a recess of the first color conversion layer in a direction perpendicular to the surface of the base substrate, and wherein the recess of the first color conversion layer does not include any portion which does not overlap the first light-blocking portion in the direction perpendicular to the surface of the base substrate.