Motion Picture Quality Research Articles

Charge transport dynamics and emission response in quantum-dot light-emitting diodes for next-generation high-speed displays

Inorganic quantum-dot light-emitting diodes (QD-LEDs) have gained significant attention as optoelectronic devices for next-generation display systems due to their superior colour properties. A comprehensive understanding of the charge transport dynamics and transient emission responses of the QD-LED is crucial to achieving high motion picture quality next-generation QD-LED display systems. In this study, we investigated the transient emission response of QD-LED devices through an advanced charge transport simulation model tailored to the quantum-dots (QDs). The dynamic response of the QD-LED devices is evaluated using the time-resolved electroluminescence measurement method for both cadmium-based and cadmium-free red, green, and blue QD-LEDs. The QD-LED devices exhibit notable emission drops during pulse voltage application. The charge transport simulation quantitatively reveals that the on and off switching speeds and the emission drops are intricately influenced by the electron and hole injection balance and a combination of carrier recombination factors within the QD layer. The charge transport simulation also shows that space-charge accumulation, due to the combined effects of charge imbalance and Auger recombination, quantitatively explains a potential device degradation mechanism. Therefore, the QD-specified charge transport model provides a crucial approach in designing and optimizing QD-LED devices for next-generation high-speed QD-LED displays with ultimate colour quality and long lifetimes.

32‐3: Late‐News Paper: Development of 540Hz LCD with Low Resistance Gate LTPS Technology

Rapid growth of the gaming monitor market in recent years has increased the demand for high frame rate display. We have developed a fast‐response liquid crystal LCD with high frame rate driving backplane based on low resistance gate LTPS‐TFT technology. The 540Hz refresh rate LCD with advanced of LTPS backplane technology has good moving picture quality and fulfills the requirement for product reliability test.

An Analysis of Gaming Display Based on Relationship between Response Time and Refresh Rate for Moving Picture Quality

An Analysis of Gaming Display Based on Relationship between Response Time and Refresh Rate for Moving Picture Quality

46‐4: High Frame Rate Scanning Backlight System For Gaming PC Display with IGZO‐TFT Technology

The rapid expansion of the gaming PC market in recent years has increased the demand for high frame rate display modules. Especially for laptops, the demand for thinner profiles and narrower borders also continues to be strong. We have developed an LCD module with a combination of a high frame rate LC panel based on IGZO‐TFT technology and a scanning backlight that enables high moving picture quality in a thin profile with narrow borders on three sides. The scanning backlight has fewer segmented areas. Nevertheless, our LCD achieves higher moving picture quality by using a fast response LC.

20‐2: Novel LCD Frame Frequency Switching Method with Minimized Flicker

Variable frame frequency driving such as driving at 120 Hz to 1 Hz is valuable for satisfying both moving picture quality and low power consumption. When driving frequency is switched in LCDs, flickering of images could arise due to fluctuation in the DC voltage component. We report a novel frame frequency switching method for minimizing image flicker after frame frequency switching.

85‐2: Subjective Evaluation of Moving Picture Quality on 4K OLED and LCD TVs for Analyzing Device Response in Detail

Subjective study was conducted on moving picture quality of 4K TVs using OLED and LCD to analyze the impact of panel device response on overall moving picture quality. By optimized test patterns and camera images, benefit of ultra‐fast response, device‐oriented motion artifacts, and overall performance including blur are efficiently evaluated.

招待論文]ディスプレイの時間応答と動画の高画質化(発光型/非発光型ディスプレイ合同研究会)

招待論文]ディスプレイの時間応答と動画の高画質化(発光型/非発光型ディスプレイ合同研究会)

Correlation Between Peak Velocity of Saccades and Susceptibility to Motion Blur

A major problem in the subjective evaluation of TV image quality is individual variability among viewers. If observers are not carefully selected for viewing studies, large individual differences in the susceptibility to image blurring result in imprecise evaluations and loss of power to detect statistically significant differences between experimental conditions. In assessments of the picture quality of traditional television, which has a narrow field of view (FOV), observers’ visual acuity (VA) should be screened before the subjective evaluations. For emerging TV systems with wide FOV (Ultra-High-Definition TV: UHDTV), in which objects move quickly relative to the display frame, it is unclear whether screening viewers’ VA is sufficient for selecting viewers to subjectively evaluate moving picture quality or sharpness. Here, we evaluated saccadic eye movement parameters to identify adequate methods to screen participants for studies evaluating UHDTV motion image quality. Each participant's evaluation of two moving pictures were highly correlated, suggesting that participants evaluated sharpness consistently. A significant correlation was observed between the average subjective evaluation score and the peak saccade velocity, but not the VA of each participant. We conclude that each participant has a certain susceptibility to image blur when evaluating moving pictures, and that this susceptibility correlates with the participant's peak saccade velocity. Thus, the objective measure of peak saccade velocity can be used to screen participants for motion picture evaluation studies.

7.3: Depletion‐Mode Oxide‐TFT Shift Register with Wide Operating Frequency Range for AMOLED Displays

This paper proposed a shift register circuit for GIP (Gate driver In Panel) in active matrix organic light emitting diode displays which enable cost innovation and narrow bezel. The shift register circuit which is made up with depletion mode oxide TFTs is designed to be driven at low operation frequency for power reduction in still image as well as to be driven at high operation frequency for motion picture quality improvement in moving image. However, it is especially difficult to operate at low frequency because oxide TFTs easily have negative Vth and zero gate‐source voltage turns out to be unable to shut down current path. The proposed shift register is integrated in a 15‐inch HD (1366 × 768, 105ppi) AMOLED panel, it is ensured that the shift register have wide operating frequency range from 1Hz to 240 Hz. In Addition, it is verified that the panel operates at high temperature(60°C) during 1,000 hours without any problems.

Network centric QoS performance evaluation of IPTV transmission quality over VANETs

Internet Protocol Television (IPTV) traffic streaming over vehicular ad hoc networks (VANETs) challenge could be distinguished by the frequent VANETs topology change, paired with real-time streaming of IPTV traffic which requires high bandwidth and strict performance service quality. For VANETs to deliver better quality IPTV traffic, the network must satisfy the compelling Quality of Service (QoS) requirement of real-time traffic streaming, such as jitter, bandwidth, delay, and loss. There are numerous metrics defined in the literature for evaluating multimedia streaming traffic QoS such as: video quality metric, peak-signal-to-noise-ratio, moving picture quality metric and many more. However, these metrics relied upon the objective approach of quality evaluation that requires the original signal as reference, and cannot isolate the impact of network impairments on the video quality. Therefore, fail to provide any mapping between the network QoS parameters and the respective deteriorated quality of the multimedia traffic. Similarly, such procedures are not practically applicable to VANETs whose network characteristics make it practically impossible to access the reference video sequence. Hence, in this paper, we conduct an experiment to determine the feasibility of delivering a qualitative IPTV service over VANETs. We derived analytical model to quantify the IPTV QoS influencing parameters, where we establish relationships between the variables of each parameter and their impacts on the IPTV traffic QoS. Through extensive experiment, we evaluate the IPTV transmission QoS parameters, to assure a priority for handling bandwidth allocation, delay and loss control to a negligible level.

High-Frame-Rate Motion Picture Quality and Its Independence of Viewing Distance

In recent years, television systems having a wider field of view (FOV) and higher spatial resolution than conventional systems have been proposed to offer an immersive viewing experience. However, few studies have investigated the effects of increasing the temporal resolution or frame rate of television systems. Assuming that people will likely use wide-FOV TVs at home in the future, we quantitatively analyzed the effects of increased frame rate and the viewing distance through a subjective evaluation of the moving picture quality. The results indicated that the moving picture quality improved more with an increase in frame rate from 60 to 120 frames per second (fps) than from 120 to 240 fps when viewing from a distance of 3 H (three times the image height). Furthermore, the effect of viewing distance on the moving picture quality was not statistically significant, and the degree of improvement depended upon the picture content.

27.2: The Study of Picture Quality of OLED TV with WRGB OLEDs Structure

AbstractAfter introducing the world first OLEDs TV with WRGB structure this year, we present results of the picture quality study of OLEDs TV. The motion picture quality is better than the conventional LCD TVs in addition to well‐known advantages like high contrast ratio, color gamut and wider viewing angle.

Top-emission AMOLED display driven by organic TFTs with semiconductor layer patterned by inkjet process

We have developed an inkjet process for laying down an organic semiconductor layer in organic thin-film transistors (OTFTs). The organic semiconductor crystallinity was improved by adjusting the contact angles of the bank, the gate insulator, and the source/drain electrodes. The threshold voltage of the OTFT was controlled by means of several surface treatments of the silicon dioxide gate insulator. The OTFTs showed a high mobility of 2.5 cm2/Vs and uniform threshold voltages of −0.4 ± 0.7 V. We also fabricated a 4-in., 80-ppi active-matrix organic light-emitting diode on a glass substrate that showed good luminance uniformity and high moving picture quality.

Super Hi-Vision Video Parameters for Next-Generation Television

The crux of the move to ultrahigh-definition television is to simply deliver a wider field of view, which only requires an increase in pixel count to 3840 × 2160 or 7680 × 4320 pixels, which are well accepted standards. However, this overlooks important factors such as color/tone rendition and motion portrayal, which could be crucial to delivering an enhanced visual experience with next-generation television (next-gen TV) systems. To this end, system parameters are proposed including colorimetry and frame frequency for next-gen TV. The proposed colorimetry system is based on the real RGB color system and has a color gamut covering 99.9% of real surface colors while using physically realizable RGB primaries. Further, a frame frequency of 120 Hz is proposed on the basis of subjective assessments of motion picture quality.

2-2 高フレームレート撮像TVの動画質改善効果(第2部門ヒューマンインフォメーション1)

2-2 高フレームレート撮像TVの動画質改善効果(第2部門ヒューマンインフォメーション1)

P‐88: Active Local Dimming System for Low Power and Motion Blur Enhancement

AbstractRecently, as the light‐emitting diodes (LEDs) technology has improved, especially LED brightness is remarkable increased, the brightness of LCD panel is enough even if LED sources are located in only short edge sides (left and right) of the LCD module. As a result, the smart local dimming system is needed to use the invented LED back light unit (BLU) efficiently. In this paper, we proposed the new local dimming system to reduce power consumption and enhance motion picture quality for a new edge LED BLU. The proposed system is applied to active 2D local dimming algorithm and scanning technique at the same time. Our local dimming system has 3 advantages, 25% power saving, 1:100,000 contrast ratio and average MPRT 3.9ms with 240Hz panel. We verified performances by measurement. Finally, our 2D dimming technique was developed as AISC IP type which was merged in timing controller (TCON), so we can apply our system for mass product in 2011 year.

2-1. 高フレームレート映像システムの動画質改善効果

2-1. 高フレームレート映像システムの動画質改善効果

高フレームレート撮像テレビジョンシステムの動画質改善効果

高フレームレート撮像テレビジョンシステムの動画質改善効果

Analysis of the Motion Picture Quality of Stereoscopic Three-dimensional Images

The stereoscopic three-dimensional (3D) display provides a 3D image by inducing binocular disparity for the observers who wear special glasses. With the rapid progress in flat panel display technologies, the stereoscopic 3D display is becoming a new benefit-model of the current display industry, and several kinds of commercial stereoscopic 3D products have been released and are attracting people. Nowadays, the motion picture quality of the 3D image becomes as important as resolution or luminance since most of the commercial 3D products are 3D televisions or 3D monitors which are required to display a clear motion 3D image. In this paper, an analysis and simulation of the motion picture quality of stereoscopic 3D image is proposed, and a comparison of the motion picture performance among the current stereoscopic 3D technologies is also provided.

Dynamic Visual Acuity (DVA) Binocular Summation and DVA Performance Factors

Recent developments in video technology enable us to view wider field-of-view (FOV) images using wide flat-panel displays, as one would a television monitor. New video systems with high resolution beyond HDTV have been proposed, but it is not clear that their motion picture quality will be sufficient if traditional video system frame rates are used. In the assessment of picture quality, it is recommended to screen viewers' static visual acuity (SVA), but not their dynamic visual acuity (DVA). Furthermore, the methodology to measure the DVA appropriate for the participants in such an assessment of picture quality has not yet been clearly established. In this paper, we have studied, experimentally, the changes in DVA performance by looking at differences in DVA measurement conditions as the first step to establish the methodology. We successfully verified the improvement of DVA performance in binocular viewing compared to monocular viewing. We also looked at the differences in DVA performance as a function of viewing conditions, including eye rotation direction (nasal or temporal direction), shape of the visual target (a Landolt C or E chart), ocular dominance (dominant or non-dominant eye), and the anisotropy or the difference in target orientation of a laterally moving target.