Rapid changes in technology solutions for digital signage displays have created multiple emerging trends, which will impact the next two to three years. This paper will explore recent innovations for a range of new and existing display technologies including LCD, OLED, Direct View LED, Micro LED as well as some interesting novel approaches, highlighting the potential advantages for digital signage.
Thick‐shell quantum dots (QDs) with green and red emission as well as high absorbance values are fabricated and dispersed in a commercial photoresist with density larger than 20 wt %. Such QD‐photoresist composites enable next‐generation displays with high brightness and wide color gamut (> 90 % Rec. 2020 coverage) through traditional lithography process for color filters. The emissive QD‐color...
Through a series of diffracted see‐through images of transparent displays, “multiscale structural similarity” is demonstrated to be the most adapted for quality assessment among several mainstream algorithms. Then aperture ratios, resolutions, and pixel geometries are evaluated and revealed to affect see‐through image quality from the most significantly to the least.
In this study, we have developed an image transforming optical element which realized a zero‐bezel flat panel display module. The zero‐bezel display module worked not only at the front view but also did at the oblique view, so that omnidirectional image expression was achieved. In addition, resolution of the display was not degraded after addition of the optical element because the resolution of the...
We investigated the laser‐phosphor light source by using inorganic phosphor wheel. We experimentally confirmed the light extraction efficiency of the inorganic phosphor wheel which is 8% higher than conventional phosphor wheel. In addition, we explain about the cause of improvement of the efficiency by showing fluorescence emission model.
We propose a novel pixel circuit using source‐follower structure to be independent of frequency effect of blue‐phase liquid crystal displays (BPLCDs). Simulation results indicated that required gray‐level‐voltages across the BPLC could be achieved accurately when a proper threshold voltage of the driving TFT was chosen. We also successfully fabricated a 12.7‐inch prototype BPLCD using the proposed...
The 2.7 inch flexible AMOELD is successfully demonstrated through FTIR analysis and mechanical simulation. Through FTIR analysis we can optimize the CVD parameter to realize the SiNx of WVTR~10−5 (60°/90% R.H.). According to the simulation result, the curvature radius can be reduced to 10mm by modulating the Organic Coating for Planarization(OCP) layer thickness.
Physics based continuous Technology Computer Aided Design (TCAD) models and organic/oxide TFT compact models are key for technology innovation. The encapsulated underlying physics produce predictive models that empower designers to explore all available design space. To achieve this, a number of challenges must be met. These include stable and reproducible fabrication with quantified material parameters...
A new approach for fabricating very‐small pixel pitch GaN microdisplays is proposed. MicroLEDS obtained from silicon grown epi GaN layers exhibit performances comparable to those obtained on classical sapphire templates. This technology shows very great promises in the fabrication of high brightness, ultra‐high‐resolution microdisplays required for augmented reality systems.
Key enabling technology for stretchable hybrid electronic is
presented, which includes rigid/soft strain‐engineered
stretchable PCB platform, inkjet‐printed programmable routing
interconnects with printed cross‐over, stable direct chip bonding,
and modulus‐gradient conductive core‐shell structured via. Pre‐stretching
combined with an inkjet‐printing process enabled us
to fabricate stretchable...
A digital modulation is the use of pulse width modulation on
liquid crystal to create gray scale and phase level. The operation
in time domain has greater RMS voltage accuracy for finer gray
scale and high pulse frequency by Terminated Write Pointer let
liquid crystal behaves more smoothly.
A 4.3‐inch 1058‐ppi 4K liquid crystal display was fabricated
using top‐gate field‐effect transistors (FETs) comprising a cloud‐aligned composite oxide semiconductor. For transparent pixels
comprising an oxide semiconductor/oxide conductor (OS/OC),
FETs, wirings, capacitors, and contacts in the pixels are
transparent. This display achieves a 63.6% aperture ratio and low
Substrate stress state determines the light leakage (LL) from dark state VA and IPS liquid crystal (LC) curved panels. Membrane stress creates VA but not IPS LL. Shear and bending stress create IPS but not VA LL. This result enables mitigation, design, and possibly new processes/components to enable non‐traditional form factor LCDs.
An oxide semiconductor (OS) display system built with normally‐off
devices, nonvolatile OS LSI and an OS display, is proposed.
The power consumption of the system is reduced by the
nonvolatile OS LSI performing power gating without vanishing
setting data when the OS display is in an idling stop (IDS) mode.
A novel 4T2C pixel circuit is proposed to realize a high‐resolution 7.8‐µm pixel pitch OLED microdisplay. In order to achieve high luminance uniformity, the pixel circuit compensates its Vth variation of the MOSFET for the driving transistor internally by using self‐discharging method. 0.5‐inch Quad‐VGA and 1.25‐inch Wide Quad‐XGA microdisplays with the proposed compensation architecture are also...
This paper presents a high dynamic range (HDR) imaging
method that generates and fuses multiple exposures from a single
image. We approximately estimate illumination using an edge‐preserving
smoothing filter and adjusts it to several levels for
generating multiple illuminations that correspond to multiple
exposures in HDR image acquisition techniques. The low
dynamic range (LDR) images of multi‐exposures...
We report liquid crystal functionalized smart fabrics fabricated
by gas jet spinning or electrospinning. These fabrics retain all
the stimuli‐responsive properties of liquid crystals. Because they
are flexible, self‐supporting and have large surface‐area‐to‐volume
ratios, these fabrics are ideally suited for an array of
Vitriflex has developed transparent flexible ultra‐barrier films for
use in OLED displays and lighting. We will present our current
results including scale‐up of optically tuned barrier films. We will
describe the end‐application needs that drive the selection of
substrates to be used for flexible ultra‐barriers.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.