Nanostructure based display devices

A display device comprising:

• an organic light emitting diode (OLED);
• a phosphor film configured to receive a primary light, from the OLED, having a first peak wavelength and to convert a portion of the primary light to emit a secondary light having a second peak wavelength that is different from the first peak wavelength;
• and
• a filter element comprising nanostructured materials that exhibit light absorption properties and do not exhibit luminescent properties, wherein the filter element is optically coupled to the phosphor film and is optically coupled to the phosphor film and is configured to allow the secondary light to pass through the filter element and to block an unconverted portion of the primary light from passing through the filter element.

A display device comprising an array of pixels, a pixel of the array of the pixels comprising:

• a sub-pixel having:
• a quantum dot (QD) film configured to receive a primary light having a first peak wavelength and to convert a portion of the primary light to emit a secondary light having a second peak wavelength that is different from the first peak wavelength, wherein the QD film comprises QDs disposed in a polymeric matrix;
• and
• a filter element configured to allow the secondary light to pass through the filter element and to block an unconverted portion of the primary light from passing through the filter element, wherein the filter element comprises nanostructured non-phosphor materials that exhibit light absorption properties and do not exhibit luminescent properties are disposed in the polymeric matrix.