Journal of the Society for Information Display最新文献

In recent years, techniques for accelerating rendering by exploiting the limitations of the human visual system have become increasingly prevalent. The foveated rendering method significantly reduces the computational requirements during rendering by reducing image quality in peripheral regions. In this paper, we propose a scene-content-sensitive real-time adaptive foveated rendering method. First, we pre-render the three-dimensional (3D) scene at a low resolution. Then, we utilize the low-resolution pre-rendered image as input to extract edge, local contrast, and color features. Subsequently, we generate a screen-space region division map based on the gaze point position. Next, we calculate the visual importance of each 16 × 16 pixel tile based on edge, local contrast, color, and screen-space region. We then map the visual importance to the shading rate to generate a shading rate control map for the current frame. Finally, we complete the rendering of the current frame based on variable rate shading technology. Experimental results demonstrate that our method effectively enhances the visual quality of images near the foveal region while generating high quality foveal region images. Furthermore, our method can significantly improve performance compared to per-pixel shading method and existing scene-content-based foveated rendering methods.

In field operations with large machines, onsite large task spaces have been typically required. In these cases, remote skilled workers have to provide a step-by-step guide by observing the onsite situation around the large task spaces in three dimensions, instructing onsite unskilled workers on how to perform the tasks with the correct hand gestures at the right position, and switching between observation and instruction frequently during the remote support. In this study, we developed a Metaverse-based remote support system with a seamless user interface for switching between free viewpoint observation and hand gesture instruction. The proposed system enables remote skilled workers to observe the onsite field from any viewpoint, transfer hand gesture instruction to onsite workers, and seamlessly switch between free viewpoint observation and free hand gesture instruction without having to change devices. We compared the time efficiency of the proposed system and a conventional system through experiments with 28 users and found that our system improved the observation time efficiency by 65.7%, the instruction time efficiency by 27.9%, and the switching time efficiency between observation and instruction by 14.6%. These results indicate that the proposed system enables remote skilled workers to support onsite workers quickly and efficiently.

We fabricated a microdisplay with a 1.50-in. organic light-emitting diode (OLED) and a pixel density as high as 3207 ppi. An ideal display with high luminance, low power consumption, an ultrahigh aperture ratio, and a wide color gamut can be fabricated using a metal maskless lithography technology for patterning OLED layers and an oxide semiconductor large-scale integration (OSLSI)/silicon LSI backplane. We designed a virtual reality device that exhibited less ghosting and a field of view of 90° or greater by combining the microdisplay and a novel pancake lens.

As ultra-high-definition displays have gained popularity, mitigating the horizontal crosstalk effect in 8K LCD panels is crucial. High display resolution requires narrower signal line integration, intensifying the coupling effect. Traditional methods like Vcom feedback and increasing analog voltage drain-drain (AVDD) load are slower and less accurate, leading to increased power consumption. In response, we propose an advanced digital signal compensation method. In this study, we developed a predictive model and investigated the intricate relationships among AVDD, Vcom, and storage capacity (Cst) ripples on horizontal crosstalk. Optimizing the ripple change (∆G) by varying the compensation coefficient (a) and decay ratio (τ) significantly reduces crosstalk effects. The digital compensation method allows rapid and precise compensation without delays, reducing horizontal crosstalk in 8K LCD panels from 4% to below 0.9%. This surpasses the requirement of minimizing crosstalk to less than 2%, substantially enhancing the image quality of high-resolution displays.

A wide-viewing-angle dual-view integral imaging display is proposed. A micro-lens array, a polarizer parallax barrier, and a display panel are aligned in sequence. The display panel is covered with the polarizer parallax barrier. Two types of orthogonal polarizer slits in the polarizer parallax barrier are alternately aligned. Two types of orthogonal polarizer slits polarize the lights from two types of elemental images. The micro-lens array propagates two types of polarized lights into two primary viewing zones, which coincide at the optimal viewing distance. Different 3D images are, respectively, observed through two types of polarizer glasses. The viewing angle is enhanced and unrelated to the number of elemental images.

Ha, J, Lee, S, Park, M, Kim, H, Jung, YK, Han, C, Hwang, J, Park, G, Lee, HJ, Bae, WK, Noh, S, Kwak, D, Kim, S, Yoon, YG, Lee, C Dual ligand exchange of Cd-free quantum dots and optimal control of ink formulation for improving the performance of all-inkjet-printed qunatum dot light-emitting diodes. J Soc Inf Display. 2024; 32(5): 332–340. https://doi.org/10.1002/jsid.1296

In the article title, the word “quantum” was mistakenly misspelled. The correct article title is below.

“Dual ligand exchange of Cd-free quantum dots and optimal control of ink formulation for improving the performance of all-inkjet-printed quantum dot light-emitting diodes”

We apologize for this error.

Antireflection surfaces are widely used in optical devices (such as vehicle display, solar cells, and architectural glass) to reduce the reflection and increase transmittance. Plasma etching shows great potential in making subwavelength antireflection structures for its advantage of scalable, low-cost, and applicable in flexible substrates. Here, we demonstrate an antireflection nanostructure by O₂ plasma etching on poly (ethylene terephthalate) (PET) substrate without additional corrosive gas species or antireflective coatings. Nanopores on the surface were formed due to the different etching rates of the organic region and silica region of the surface. The solar weighted average transmittance was improved from 91.6% to 94.8% for single-side treated PET with silica antiblocking layer. The transmission increment was attributed to the gradient refractive index of the nanostructured surface due to the elimination of step discontinuity in refractive index. The result shows a highly efficient, eco-friendly, solvent-free, economical, and sputtering target-free method for reducing the reflection and increasing the transmittance of the substrates.

This study developed a technology for a vertical field-effect transistor (VFET) incorporating c-axis aligned crystal oxide semiconductor on a Gen 3.5 glass substrate. VFETs, with a channel length of 0.5 μm, demonstrated stable characteristics with minimal variation, higher on-state current compared with low-temperature polysilicon FETs, and extremely low off-state leakage current. A prototype 513-ppi organic light-emitting diode display that features a red, green, and blue stripe arrangement and includes an internal compensation circuit with a configuration of six transistors and two capacitors was fabricated by harnessing the advantageous features of VFETs. Such a display was previously unattainable with planar FETs. Thus, the developed VFET technology presents a viable pathway for achieving ultrahigh-resolution panels on glass substrates.

In this study, the PEDOT:PSS conductive polymer material was spin-coated on the ITO surface to improve the surface roughness of the ITO and reduce the spikes on the ITO surface, so as to avoid the burning spots generated in the green organic light emitting diode (OLED) when the voltage was applied to light it up. The OLED emitting is successfully survived. Deuterium atoms (isotopes of hydrogen) with heavier atomic weights can strengthen C-D bonds, slow down the kinetic rate for unwarranted chemical reactions, and improve the performance and stability of OLEDs. In this study, deuterated D-Ir (mppy)₃ was employed as the dopant in the emitting layer of green OLED to replace the general Ir (mppy)₃ to improve the optoelectronic properties and extend the lifetime of green OLED. At a constant voltage of 4 V, the initial luminance and half lifetime of general Ir (mppy)₃ doped and deuterated D-Ir (mppy)₃ doped OLEDs are 188.1 cd/m², 7.2 h and 438.3 cd/m², 42.8 h, respectively. It is shown that doping the deuterated D-Ir (mppy)₃ material in the emitting layer has the effect of prolonging the lifetime of OLED. Compared with the general Ir (mppy)₃, the lifetime of deuterated D-Ir (mppy)₃ doped OLED achieved an extension by 5.9 times.

Micro LED is an extremely small-sized LED where each individual LED operates independently, providing high brightness, excellent contrast ratio, wide color gamut, and other outstanding visual characteristics. We have developed the transfer technology for micro LED chips using our proprietary PR (photoresist) expansion technique. This exclusive PR expansion technology, leveraging semiconductor photo processes, enables pitch conversion between micro LED chips and maintains a high level of accuracy in chip transfer at a sub-micron scale. This innovative transfer technology allows for high-density integration of micro LED chips, effectively reducing the cost per chip, and serving as a key driver for rapid growth in the micro LED market.