Light-adaptable display for the future advertising service

Abstract

In this paper, a new light-adaptable display (LAD) structure with minimum power consumption is proposed for the future advertising service, and the demonstrated results are reported. An organic light-emitting diode with color reflection (colored OLED) was applied for the reflective-and emissivemode device, and a guest-host liquid-crystal device (GH-LC) was adopted for the light shutter device. The current efficiency and reflectance of the colored OLED were 35.15 cd/A at 457 cd/m 2 luminance and 63% for the yellow color, respectively. The measured contrast ratio of GH-LC was 15.5:1 at darkroom conditions, respectively. Transparent oxide thin-film transistors were used for the backplane, and their average mobility was 9.08 cm 2 /V s, with a 0.5 standard deviation. Through the optimization of the fabrication process and the structures of each device, the LAD adaptively operating according to the environmental illuminance from dark to 10,000 nits was successfully demonstrated. Moreover, a new LAD driving method was proposed for minimizing the power consumption. ARTICLE HISTORY

Optical Analysis of Power Distribution in Top-Emitting Organic Light Emitting Diodes Integrated with Nanolens Array Using Finite Difference Time Domain

“…As replacements for the typical fluorescent blue OLEDs, many researchers have adopted phosphorescent materials and have focused on their design and synthesis to obtain high EQE. ,,− Nevertheless, blue phosphorescent emitters had short lifetimes that are not suitable for real applications . A thermally activated delayed fluorescent (TADF) device can be another alternative that provides a different emitting layer (EML) material.…”

Thin-film transistor-driven vertically stacked full-color organic light-emitting diodes for high-resolution active-matrix displays

“…The C ST was designed to be 65 pF, which was~200 times higher than the parasitic capacitor. The W/L ratio of the SW TFT was designed to be 100/10, to ensure sufficient charging time for our test platform active-matrix OLED, with a 60 Hz frame rate 46 . The aperture ratio for each OLED was 63%, which is a significant advantage of the vertically stacked OLED over a laterally arranged, three sub-pixel structure, where each aperture ratio cannot exceed 33.4%.…”

Improvement of Colour Gamut in Bottom-Emission Organic Light-Emitting Diodes Using Micro-Cavity Structure Embedded Cathodes

“…The multi-layer structure of HIL/HTL was used to drive the voltage reduction in OLEDs [14]. The thin metal cathode layer of Ag 20 nm may pose a problem for large-sized display panels due to the increase of electric resistance, but it can be sufficiently applied to a small-sized display panel [15].…”