A 5.46inch WQHD foldable AMOLED display having thin thickness, wide color gamut, high brightness and low reflectivity was obtained. These properties, which outperform those of a conventional RGB OLED and circular polarizer system, were achieved with a novel structure of RGB emitter, thin film encapsulation and low temperature color filter directly patterned on TFE.

A novel under‐display camera structure with high transmittance up to 40.8% was proposed to increace transmittance, in which all pixel circuits and metal traces were moved to the transition zone which is right next to the UDC zone, and the circular polarizer was replaced with COE, and then the metal cathode is patterned by self‐assembly method, and the disconnected cathodes are connected together by transparent auxiliary cathode.

Quantum dot display with blue light excitation has attracted a lot of attention recently. In this work, rigid 13.6 inch 1920×1080 FHD full color active matrix quantum dot OLED display (QDOLED) on glass substrate and another evolutional flexible Quantum dot Filter On Electroluminescence display (QFOE) on polyimide (PI) substrate were fabricated with different device configuration. Cd‐free InP QD was introduced into photo‐curable resin and patterned by inkjet‐printing or photolithography process as the color conversion material (CCM). The 2‐stack blue OLED (B‐OLED) device designed under the balance of efficiency and uniformity was employed to excite QD pixel patterns by active matrix driving of coplanar oxide thin‐film transistor (TFT) backplane. The display performances of wide viewing angle, high color purity and excellent contrast ratio are preserved after the flexible process integration into QFOE to show more application potentials in near future.

The quantum dot light emitting diodes (QLEDs) based on solution process are reported for its stability and efficiency. Our work demonstrate that the thickness of hole transporting layer (HTL) play an important role in the QLEDs device. HTL may be corroded by the QD solvent with the process of spin-coating. And so the quality of HTL, such as roughness, compactness, reliability, becomes worse. The HTL thickness loss more, the quality of QDs layer will be worse. By reducing HTL initial thickness, HTL thickness loss was reduced and the roughness and uniformity of QDs layer which is on the HTL layer was improved. Meanwhile, the efficiency and brightness of QLEDs were improved and the threshold voltage was lowered. However, leakage current increased. In the other hand, if HTL initial thickness is increased, the hole injecting layer (HIL) can be covered completely and leakage current will decrease, meanwhile, the life time can be improved. Therefore, an optimized initial thickness of HTL is very important for QLEDs. In this paper, we also will show the red passive-matrix QLED device color.

A 6.2inch WQHD+ R1 foldable AMOLED display with FLI structure having thin thickness, wide color gamut, high brightness and low reflectivity was obtained. FLI means a structure of RGB emitter, thin film encapsulation, On-TFE-Touch and low temperature color filter.