Efficiency improvement and image quality of organic light-emitting display by attaching cylindrical microlens arrays

Abstract

In this paper, cylindrical microlens arrays with two different alignments were proposed to be applied in a commercial mobile phone having an organic light-emitting diode (OLED) panel. It was found that the parallel-aligned cylindrical array had better performance than the vertical-aligned one for the OLED panel. The parallel-aligned cylindrical microlens array can increase the luminous current efficiency at surface normal and the luminous power efficiency of the OLED panel by 45% and 38%, respectively. Besides, it can also make the spectrum of the OLED panel more insensitive to the viewing angle. Though it can slightly blur the image on the OLED panel, the universal image quality index can be maintained at a level of 0.8630.

Emission Characteristics of Organic Light-Emitting Diodes and Organic Thin-Films with Planar and Corrugated Structures

“…However, due to the light ray redirection, it also resulted in image blurring for display applications. Using a micro-cylinder may result in lower blur [85]. It is also possible to combine the microcavity effect and microlense structure [86].…”

Enhancing the Out-Coupling Efficiency of Organic Light-Emitting Diodes Using Two-Dimensional Periodic Nanostructures

“…There have been various methods to increase the extraction efficiency of OLEDs. These methods can be divided into two categories, one is to place some nanostructures or low index materials on the substrate-air interface for the extraction of substrateguided modes, such as, substrate surface roughening [5] and use of microlenses arrays [6] . The other is to insert some periodic nanostructures between the metallic cathode and the substrate layer to recover the waveguide loss in the ITO/organic layer, for example, using a refractive index modulation layer [7] or photonic band gap structure [8].…”

33.2: Spatial Resolution Characteristics of Organic Light‐emitting Diode Displays: A comparative Analysis of MTF for Handheld and Workstation Formats

“…There, handheld displays are being used in X-ray, computed tomography, magnetic resonance, and ultrasound imaging [5], where images have to be interpreted accurately and rapidly particulary in emergency cases. While a few papers have reported on the contrast and luminance characteristics of OLED displays [6,7], a comprehensive study of the spatial characteristics has not yet been presented. The spatial resolution and noise characteristics of the device could affect the image interpretation performance [8,9].…”