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Frequency Selection Concurrent Sensing Technique for High-Performance Touch Screens 高性能触摸屏的频率选择并行传感技术
Journal of Display Technology Pub Date : 2016-09-08 DOI: 10.1109/JDT.2016.2607168
Mohamed G. A. Mohamed;Kyoungrok Cho;HyungWon Kim
{"title":"Frequency Selection Concurrent Sensing Technique for High-Performance Touch Screens","authors":"Mohamed G. A. Mohamed;Kyoungrok Cho;HyungWon Kim","doi":"10.1109/JDT.2016.2607168","DOIUrl":"https://doi.org/10.1109/JDT.2016.2607168","url":null,"abstract":"In this paper, we present a frequency selection concurrent sensing (FSCS) technique for multi-touch detection of the projected mutual capacitance touch screens. The proposed technique improves the signal-to-noise ratio (SNR) and the frame scan rate of large touch screens. With the proposed technique, the controller concurrently applies sine waves with different frequencies to all drive lines. It converts the output signals of each sense line to the frequency domain using a Fast Fourier Transform, and measures the touch signal strength at the frequency corresponding to each touch position. We show that the proposed method can substantially improve the SNR by properly selecting the frequencies for the excitation signals to avoid the ambient noise. We also demonstrate that the FSCS technique can significantly increase the frame scan rate by concurrently driving all lines. Experimental results show that the proposed technique provides a frame scan rate of 128.2 Hz and an SNR of 70.5 dB with a large touch screen of 23 in.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1433-1443"},"PeriodicalIF":0.0,"publicationDate":"2016-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2607168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50399946","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
High Uniformity and Tolerance Design for Direct-Lit LED Backlight Illumination Using Lagrange Interpolation 拉格朗日插值法实现直光LED背光照明的高均匀度和高容限设计
Journal of Display Technology Pub Date : 2016-09-07 DOI: 10.1109/JDT.2016.2606649
Tsung-Xian Lee;Bo-Song Chen
{"title":"High Uniformity and Tolerance Design for Direct-Lit LED Backlight Illumination Using Lagrange Interpolation","authors":"Tsung-Xian Lee;Bo-Song Chen","doi":"10.1109/JDT.2016.2606649","DOIUrl":"https://doi.org/10.1109/JDT.2016.2606649","url":null,"abstract":"This paper proposes the use of a Lagrange interpolation polynomial to meet the illumination distribution requirements of single-LED units, in both a square and a triangular arrangement, for direct-lit backlighting to obtain uniform illumination to be used for designing secondary optical lenses. In addition, we propose the use of a wider illumination coverage of LED units to achieve excellent assembly displacement tolerance. We also define an evaluation formula for combining the uniformity and tolerance of the LED unit to select its ideal corresponding light intensity distribution as the target of the lens design in direct-lit LED backlight modules.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1403-1410"},"PeriodicalIF":0.0,"publicationDate":"2016-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2606649","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50399951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
OLED Power Control Algorithm Using Optimal Mapping Curve Determination 基于最优映射曲线确定的OLED功率控制算法
Journal of Display Technology Pub Date : 2016-09-07 DOI: 10.1109/JDT.2016.2606645
Suk-Ju Kang
{"title":"OLED Power Control Algorithm Using Optimal Mapping Curve Determination","authors":"Suk-Ju Kang","doi":"10.1109/JDT.2016.2606645","DOIUrl":"https://doi.org/10.1109/JDT.2016.2606645","url":null,"abstract":"In this study, a new organic light-emitting diode power control algorithm that uses optimal gray-level mapping curve determination is proposed. In general, conventional approaches produce color distortion or they require additional circuits for power reduction, whereas the proposed algorithm only changes the gray levels of an input image by considering the original image quality without additional circuits. In particular, the proposed algorithm generates an objective function after estimating the image degradation and power consumption. Next, it searches for the minimum value of the function and determines the final gray-level mapping curve. According to the results of simulations, the proposed algorithm reduces the power consumption by up to 10.964% compared with the conventional algorithm, while still preserving the high image quality.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1278-1282"},"PeriodicalIF":0.0,"publicationDate":"2016-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2606645","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50281229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Evaluating Visual Fatigue to Keep Eyes Healthy Within Circadian Change During Continuous Display Operations 在连续显示操作期间，在昼夜节律变化范围内评估视觉疲劳以保持眼睛健康
Journal of Display Technology Pub Date : 2016-09-07 DOI: 10.1109/JDT.2016.2606509
Tetsuya Muraoka;Shunji Uchimura;Hiroaki Ikeda
{"title":"Evaluating Visual Fatigue to Keep Eyes Healthy Within Circadian Change During Continuous Display Operations","authors":"Tetsuya Muraoka;Shunji Uchimura;Hiroaki Ikeda","doi":"10.1109/JDT.2016.2606509","DOIUrl":"https://doi.org/10.1109/JDT.2016.2606509","url":null,"abstract":"Visual fatigue is caused by display operations on a PC for a long time in a day, which might be serious if it exceeds the circadian limit. To avoid this kind of events, any action to check them by oneself needs to be done if these continue for multiple hours. This paper employs a simple method to check for visual fatigue with declines in visual accommodation during the display operations on the PC as indexes. Testing the fatigue of human eyes was sensed by using Landolt rings displayed on a smartphone newly used as a tiny high precision display. The daily check will help the display operators on the PC to keep visual health, avoiding them from the fatigue exceeding the circadian change limit. The visual distance was successfully set at 0.5 m on a smartphone for checking declines in visual accommodation.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1464-1471"},"PeriodicalIF":0.0,"publicationDate":"2016-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2606509","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50281501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Psychophysical Assessment of Perceptual Performance With Varying Display Frame Rates 不同显示帧率下感知性能的心理物理评估
Journal of Display Technology Pub Date : 2016-09-02 DOI: 10.1109/JDT.2016.2603222
Sihem Kime;Francesco Galluppi;Xavier Lagorce;Ryad B. Benosman;Jean Lorenceau
{"title":"Psychophysical Assessment of Perceptual Performance With Varying Display Frame Rates","authors":"Sihem Kime;Francesco Galluppi;Xavier Lagorce;Ryad B. Benosman;Jean Lorenceau","doi":"10.1109/JDT.2016.2603222","DOIUrl":"https://doi.org/10.1109/JDT.2016.2603222","url":null,"abstract":"This study assesses the impact of display refresh rate on the perception of dynamic visual stimuli in humans. A projection platform was developed in that context, allowing control of the frame rate on a trial-by-trial basis. Using this display, we introduce a series of psychophysical experiments aimed to quantitatively assess objective perceptual performance at different frame rates. Tasks that are often implicitly performed when watching movies on a television set, or when wearing a head mounted display, were chosen: speed discrimination, spatial discrimination, and reading abilities, with stimuli undergoing horizontal motion in a wide range of speeds (\u0000<inline-formula> <tex-math>$16-38;text{deg/s}$</tex-math></inline-formula>\u0000). The results show that whatever the stimuli or the task, performance is significantly better at high frame rate (HFR) compared to 60 Hz, providing clear-cut evidence that low refresh rates limit the ability to reliably analyze moving stimuli. These results extend those of previous psychophysical experiments performed at low refresh rates, further characterize genuine visual performance in humans and provide an objective benchmarking methodology allowing to assess visual performance with a variety of displays. Results indicate that for low resolution displays, where increasing spatial resolution is not an option, increasing frame rate could benefit motion perception. We discuss these results and their implications with regards to current and emerging categories of visual displays, such as head mounted displays.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1372-1382"},"PeriodicalIF":0.0,"publicationDate":"2016-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2603222","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50281500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Capping Ti-Doped GaZnO on InGaZnO Layer As the Composite-Channel Structure for Enhancing the Device Performances and Stability of Thin-Film Transistors 在InGaZnO层上覆盖Ti掺杂的GaZnO作为复合沟道结构以提高薄膜晶体管的器件性能和稳定性
Journal of Display Technology Pub Date : 2016-09-02 DOI: 10.1109/JDT.2016.2605703
Wei-Sheng Liu;Ying-Fu Chen;Yu-Ming Wang
{"title":"Capping Ti-Doped GaZnO on InGaZnO Layer As the Composite-Channel Structure for Enhancing the Device Performances and Stability of Thin-Film Transistors","authors":"Wei-Sheng Liu;Ying-Fu Chen;Yu-Ming Wang","doi":"10.1109/JDT.2016.2605703","DOIUrl":"https://doi.org/10.1109/JDT.2016.2605703","url":null,"abstract":"The device performances of an amorphous indium gallium zinc oxide transparent thin-film transistor (a-IGZO TFT) were improved by using a Ti-doped GaZnO (GTZO) as the channel capping layer in this study. The GTZO thin film exhibited a high carrier concentration of 1.5 × 10\u0000<sup>21</sup>\u0000cm\u0000<sup>-3</sup>\u0000 and served as both a carrier supplement and passivation layer for reducing the absorption of oxygen and moisture as well as the back-channel charge trapping in the composite-channel TFT. An enhanced carrier mobility with high electron concentration in the composite GTZO/IGZO heterostructure was verified in the Hall measurement. The GTZO/IGZO composite-channel TFT was demonstrated to show an improved carrier mobility of 15.5 cm\u0000<sup>2</sup>\u0000/V-s, subthreshold swing of 0.35 V/decade, off current of 1.4 × 10\u0000<sup>-11</sup>\u0000 A, threshold voltage of 1.4 V, and ON/OFF current ratio of 1.2 × 10\u0000<sup>7</sup>\u0000. Stable operation with unchanged device characteristics was observed following a bias-stress test. Thus, the fabricated GTZO/IGZO TFTs exhibited advantageous device performance and improved device operation stability.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 12","pages":"1554-1559"},"PeriodicalIF":0.0,"publicationDate":"2016-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2605703","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50306567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Influence of Temperature on the Steady State and Transient Luminance of an OLED Display 温度对OLED显示器稳态和瞬态亮度的影响
Journal of Display Technology Pub Date : 2016-08-31 DOI: 10.1109/JDT.2016.2605038
Frédérique Chesterman;Bastian Piepers;Tom Kimpe;Patrick De Visschere;Kristiaan Neyts
{"title":"Influence of Temperature on the Steady State and Transient Luminance of an OLED Display","authors":"Frédérique Chesterman;Bastian Piepers;Tom Kimpe;Patrick De Visschere;Kristiaan Neyts","doi":"10.1109/JDT.2016.2605038","DOIUrl":"https://doi.org/10.1109/JDT.2016.2605038","url":null,"abstract":"In this paper, the influence of temperature on the luminance of an organic light-emitting device (OLED) display is investigated. Luminance, temperature, and power measurements are executed on a 55-in white-red-green-blue active-matrix OLED display with a resolution of 1920 × 1080 and an oxide-thin-film-transistor (TFT) backplane, under a controlled, static temperature environment. The measurements indicate a strong influence of temperature on the luminance of the display, resulting from the temperature dependence of both the TFT and the OLED. The influence of temperature on the luminance of an OLED display is also investigated in a dynamic context. Measurements show that temperature changes resulting from losses in the display have an important influence on the luminance stability of the display. The measurements linking luminance and temperature in a static temperature environment allow estimating the change in luminance in a dynamic context. Finally, this paper presents the results of a number of experiments that were set up to show scenarios in which the temperature dependence of the display's luminance has a direct negative impact on the picture quality of the display. The results of this work show that the thermal behavior of an OLED display must be taken into account when working towards a high-performing OLED display.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1268-1277"},"PeriodicalIF":0.0,"publicationDate":"2016-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2605038","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50281356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Analysis of Condition for Integral Floating Display Inducing Proper Accommodation Responses 积分浮动显示器产生适当调节响应的条件分析
Journal of Display Technology Pub Date : 2016-08-30 DOI: 10.1109/JDT.2016.2604321
Ki-Hong Choi;Myoung Ju Won;Mincheol Whang;Sung-Wook Min
{"title":"Analysis of Condition for Integral Floating Display Inducing Proper Accommodation Responses","authors":"Ki-Hong Choi;Myoung Ju Won;Mincheol Whang;Sung-Wook Min","doi":"10.1109/JDT.2016.2604321","DOIUrl":"https://doi.org/10.1109/JDT.2016.2604321","url":null,"abstract":"The condition for the integral floating display is analyzed and evaluated, which elicits the distinguished accommodation responses to different axial locations of targets. The analysis is carried out to derive condition which helps to devise such a system. And measurements of accommodation response from four subjects are conducted to confirm the agreements with the analytical results, by using the auto-refractometer. The two sample Kolmogorov-Smirnov test is applied to evaluate the measurement results qualitatively. The robust agreements between the analysis and the empirical results are observed. This research can be applied in the optimization of augmented reality or virtual reality devices to provide effective three-dimensional depth cues and relieve viewing discomforts.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1352-1363"},"PeriodicalIF":0.0,"publicationDate":"2016-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2604321","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50281499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Efficient Image Warping in Parallel for Multiview Three-Dimensional Displays 多视图三维显示器的高效并行图像扭曲
Journal of Display Technology Pub Date : 2016-08-25 DOI: 10.1109/JDT.2016.2602386
Nan Guo;Xinzhu Sang;Songlin Xie;Peng Wang;Chongxiu Yu
{"title":"Efficient Image Warping in Parallel for Multiview Three-Dimensional Displays","authors":"Nan Guo;Xinzhu Sang;Songlin Xie;Peng Wang;Chongxiu Yu","doi":"10.1109/JDT.2016.2602386","DOIUrl":"https://doi.org/10.1109/JDT.2016.2602386","url":null,"abstract":"Three-dimensional (3D) display technologies make great process in recent years. View synthesis for 3D content requires the hole-filling, which is a challenging task. The increase of resolution and the number of views for view synthesis brings new challenges on memory and processing speed. A predicted hole mapping (PHM) algorithm is presented, which requires no filling priority and smoothing operation, allowing parallel computation that facilitates a real-time 3D conversion system. In experiments, the proposed PHM is evaluated and compared with some other methods in terms of peak signal to noise ratio and structural similarity index measurement, and the result shows the advantages in the numbers. The method can operate on the 32-view display with 4K × 2K resolution in real time on GPU.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1335-1343"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2602386","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50400092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Gate Driver Circuit Using Pre-Charge Structure and Time-Division Multiplexing Driving Scheme for Active-Matrix LCDs Integrated with In-Cell Touch Structures 采用预充电结构和时分复用驱动方案的有源矩阵LCD栅驱动电路
Journal of Display Technology Pub Date : 2016-08-24 DOI: 10.1109/JDT.2016.2601948
Chih-Lung Lin;Ming-Yang Deng;Chia-En Wu;Po-Syun Chen;Ming-Xun Wang
{"title":"Gate Driver Circuit Using Pre-Charge Structure and Time-Division Multiplexing Driving Scheme for Active-Matrix LCDs Integrated with In-Cell Touch Structures","authors":"Chih-Lung Lin;Ming-Yang Deng;Chia-En Wu;Po-Syun Chen;Ming-Xun Wang","doi":"10.1109/JDT.2016.2601948","DOIUrl":"https://doi.org/10.1109/JDT.2016.2601948","url":null,"abstract":"This paper presents a new gate driver circuit for active-matrix liquid crystal displays with an in-cell touch structure designed by hydrogenated amorphous silicon thin-film transistors. To increase the reporting rate of a touch panel, the proposed circuit can be used to pause display operations to perform touch sensing operations several times per frame. The proposed circuit exploits a pre-charge structure that alleviates the leakage current and long-term stress of a driving TFT during the touch sensing operation. Simulation results confirm that the proposed gate driver circuit can generate a highly uniform output waveform after each touch sensing operation that lasts for 200 μs when the circuit is operate at 85 °C. The variations of the rising and falling time are suppressed below 3.71%, confirming the feasibility of use of the proposed gate driver circuit for an in-cell touch panel.","PeriodicalId":15588,"journal":{"name":"Journal of Display Technology","volume":"12 11","pages":"1238-1241"},"PeriodicalIF":0.0,"publicationDate":"2016-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1109/JDT.2016.2601948","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50399945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
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