67‐2: Invited Paper: Ambient Processing of Quantum Dot Photoresist for Emissive Displays

Abstract

Moving the light conversion by quantum dots (QDs) from the backlight to the front of the LCD has the potential to further improve both the overall efficiency and color gamut of the display. In order to accomplish this change of architecture, the QDs have to be patterned at the sub‐pixel pitch of the display. This requires the QDs to be integrated into a photoresist at high concentration in order to produce pixels of the required size and optical density. Here we report on our fabrication and characterization of red and green QD photoresist, as well as how we model its performance in displays.

Enhancement of Optical Efficiency in White OLED Display Using the Patterned Photoresist Film Dispersed With Quantum Dot Nanocrystals

“…This significant architectural change replaces the color filter layer with a quantum dot conversion layer, thus creating a Quantum Dot Color Filter (QDCF). 2 In addition, not only can QDCFs be used to replace the color filter layer in LCD panels, they can also be used as color conversion layers in OLED and micro-LED (µLED) displays. 3,4 Quantum dot conversion layers can be deposited using conventional lithographic methods, but material usage, pixel pitch and yield requirements present many challenges.…”

A New Frontier for Quantum Dots in Displays

“…With these additional improvements to cadmium-free quantum dots, Nanosys and collaborators have demonstrated patterned QDCC layers using both photoresist and inkjet printing. 12 Figure 4 shows an RGBprinted array with 280 µm × 80 µm subpixels demonstrated by Nanosys and ink maker DIC. 13 The green and red subpixels contain thermal-cure quantum-dot ink, while the blue subpixel contains a scattering media to better match the angular distribution of the emissions.…”

62‐7: Invited Paper: Quantum Dot Color Conversion for OLED and microLED Displays

“…A variety of manufacturing technologies are currently being explored for QDCC fabrication. Additive methods such as inkjet printing 5 are attractive due to lower material usage, while photolithography 6 and transfer printing 7 can leverage installed equipment in fabs around the world. In all cases, the deposited and patterned QDCC film must be very thin (5-10 µm).…”