最新刊期
期 1 ， 2016
- 摘要：Optical measurements and the optical application of liquid crystal materials are the main research techniques and areas of practical implementation in liquid crystal physics. It follows that, just as the optical methods for studying liquid crystals continually advance in step with widening comprehensions and deepening understandings in the discipline of liquid crystals, so those optical methods themselves drive the fascinating study of liquid crystals to evermore spectacular outlooks. Travelling along the timeline of developments in the liquid crystal field, this review introduces and analyses certain standard optical techniques found in liquid crystal research that are based upon a single crystal model, including a consideration of their principles, applications, limitations and fallacies. Further, in view of how liquid crystal materials are anchored and limited to a thin cell gap during most incidences of optical measurements and applications, this review focuses on introducing a technique of liquid crystal optics based upon a multi-layered system of anisotropic-isotropic films, which correctly describes the optical measurement and response of liquid crystal cells. Also included are detailed introductions to and comparisons of recent developments in modern optics, such as optical guided waves and optical surface waves, their interactions, coupling influences, modulation by liquid crystals, and their applications, etc. Finally, this review introduces and discusses a very recently developed material-that composed of an ordered mixture of liquid crystals, an organic anisotropic material, and metallic non-spherical nano-particles, an inorganic anisotropic material-its behaviour in liquid crystal cells, its potential applications, and the challenge it presents to optical measurements and modelling.关键词：crystal optics;liquid crystal optics;liquid crystal physics;optical guided wave;optical surface wave
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发布时间：2020-08-12
Invited Paper
- 摘要：In order to improve the view angle of twisted nematic liquid crystal display (TN LCD), we synthesized a triphenylene discotic liquid crystals and prepared simple optical compensation film by using this material. This triphenylene discotic compound was synthesized from 4-chlorobutyl acetate,methyl 4-hydroxybenzoate and 1,2-dimethoxybenzene by seven steps in high yield. The construction was confirmed by nuclear magnetic resonance (NMR) and elemental analysis (EA). We also measured the parameters and the performances of this compound by polarizing optical microscope (POM), pretilt angle tester and differential scanning calorimetry (DSC). Simple optical compensation film was prepared by several steps including substrate surface treatment, rubbing-alignment, coating and so on. This triphenylene discotic compound has negative optical anisotropy (Δn=-0.0608), wide nematic phase range (54.6~166.4℃), the optical compensation film has a certain compensative effect (Rth=137 nm). This triphenylene discotic compound can be used in optical compensation film of the TN LCD. The preparation method is of simple operation and low cost, which can also realize industrialization easily.关键词：triphenylene;discotic liquid crystals;optical compensation film;negative optical anisotropy
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发布时间：2020-08-12 - 摘要：In order to analyze the influencing mechanism of sublimate components on performance of photo spacer, a comparative research between material A of mass production and material B contained sublimate components is studied. By method of FTIR, 3D scanning microscope, elasticity test and mass production test, the sublimate components, profile, mechanical property and stability of mass production about photo spacer are analyzed. The experiment results show that the additive sublimate component is a kind of acrylate monomer which has lower melting and boiling point, it can increase about 1.5μm of top CD at the same process condition. The acrylate monomer can also decrease about 1μm of bottom CD, but it will form sublimate curved film on the mask during the process of mass production, and increase sub photo spacer size and height. The additive sublimate components can improve compressive strength of photo spacer and meet the requirement of high PPI TFT-LCD products, but it will increase the risk of cold bubble.关键词：TFT-LCD;photo spacer;sublimate
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发布时间：2020-08-12 - 摘要：In order to overcome the inconsistent contact area between SD line and P-Si caused by the difference of etching rate in via hole dry etching technology, as well as to solve the point contact between SD line and P-Si made by P-Si surface convex during the ELA process, we explored the influence of various via hole dry etching technology upon the property of TFT-LCD, so as to find the optimal via hole dry etching technology.Two different samples of LTPS array were prepared by using BOE production line equipment, wherein the sample 1 was prepared by adopting conventional Just Contact Method, while the sample 2 was prepared by adopting a new type of Side Contact Method. Besides the differences of contacting methods, there is no other differences of technological processes during making these two samples.The experimental results show that the multipoint U-I curve changes from a divergent curve to a concentration curve, and electron mobility increases in some degree. In addition, the SEM data show that the P-Si can be cut through completely by Side Contact Method. Side Contact Method is able to overcome the inconsistent contact area between SD line and P-Si caused by the difference of etching rate of via hole dry etching technology, as well as to solve the point contact between SD line and P-Si made by P-Si surface convex during the ELA process,so that the TFT-LCD electrical performance can be improved. In addition, the Side Contact Method can reduce the process time, and improve the productivity.关键词：dry etch;Just Contact Method;contact hole;TFT-LCD;low-temperature polysilicon technology
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发布时间：2020-08-12 - 摘要：In order to reduce the response time of liquid crystal wavefront corrector, the effect of pretilt angle and anchoring strength on the device response performance are studied in this paper, using photo-alignment technology. The liquid crystal molecular dynamic equation is solved to obtain the relation between pretilt angle and response time. According to the quantitative relationshios among the pretilt angle, the anchoring strength and the response time, a formula is derived to describe the relation between anchoring strength and pretilt angle. This study can be used to simplify the measuring method of anchoring strength. The order parameter of photo-alignment film were measured by spectrometry. Based on this study, several photoaligned LC cells with different pretilt angle are fabricated with four different exposure modes. Theoretical simulation and experimental results consistently showed that:after azo dye molecules (SD1) obtained a certain anchoring strength, the response performance of device will be optimized by reducing the pretilt angle.关键词：pretilt angle;anchoring strength;response time;photoaligned LC cell
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发布时间：2020-08-12 - 摘要：With the gradual introduction of high resolution products, the process parameter margin of TFT-LCD array is getting stricter. In order to control the wet etching parameters better, the influence factors of wet etching FI CD uniformity and how to improve the uniformity of wet etching are studied. Firstly, we study and testify the influence of parameters of wet etching equipment on uniformity, including the etching temperature, flowrate, pressure, concentration, Nozzle Sliding, Oscillation Speed, etching time, etc. Secondly, we study how the deposition process, exposure procedure and product design may affect the uniformity and try to improve them. Research result shows that a stable parameter can significantly help the etch uniformity. By stabilizing the parameters of temperature, flowrate and pressure, the uniformity of FICD has decrease from 1.0 to 0.5. Testing and adjusting the parameters of wet etching equipment accordingly can effectively improve the etching uniformity and improve the effect significantly.关键词：TFT-LCD;wet etching;FI CD;uniformity
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发布时间：2020-08-12 - 摘要：A metal/oxide/metal (M1/O/M2) stack Ag/MoO3/Ag is introduced to fabricate organic light-emitting devices (OLEDs) as a anode instead for ITO. Effects of different structures of the anode on transmittance, brightness, spectrum of OLEDs are researched in this paper. A series of devices is fabricated by the means of vacuum evaporating with the structure of Ag/MoO3/Ag/MoO3(10 nm)/NPB(40 nm)/Alq3(60 nm)/LiF(1 nm)/Al(150 nm). Current density-voltage characteristic, brightness-voltage characteristic, spectrogram characteristic of the devices are analyzed. It is found that brightness of the device which is applied Ag/MoO3/Ag 20/20/10(nm) as the anode reaches the maximum of 18421 cd/m2 and the best current efficiency of 2.45 cd/A with the operating voltage of 11 V. Because of microcavity effect, the center wavelength of EL spectra is blue-shifted and the full width at half maximum becomes narrower. But considering its electrode transmittance is only 17% at 530 nm, the OLED device is actually brighter than the ITO electrode device by the conversion. They can be used as anodes for top-emitting and transparent flexible OLED because of the simplicity of the production.关键词：stack;silver;transparent anode;OLED
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发布时间：2020-08-12
Material and Device
- 摘要：Ultra-slim display has been a trend in the market. The chemical slimming of semi-finished display panels was studied by the alternation process of etching and cleaning. Under the protection of photoresist and sealant, the etching rate was effectively improved by adjusting HF concentration, adding a certain amount of nitric acid, hydrochloric acid, sulphuric acid, and increasing ultrasonic intensity. The surface roughness and the precipitation of white adhesive matter on the surface were effectively reduced by alternative cleaning process. The thickness of display panel decreased from 0.8 mm to 0.3 mm, the substrate surface roughness reached to 11.32 nm, and the thickness uniformity was 4.26%. The intermittent slimming process can be applied to the present production process of display panels, and provides a practical plan for producing ultra-slim liquid crystal display panels and ultra-slim organic light emitting display panels.关键词：display panel;chemical slimming;intermittent process;etching
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：In order to acquire synchronously and transfer four channels signal outputted by quadrant detector, a high-resolution, high-rate synchronous data acquisition and transmission system is designed. Firstly, an FPGA chip named EP1C12Q240 is selected as the core to control the acquisition of AD (ADS1274) and buffer data into FIFO on chip. Then the data is packaged into images consist of 32×40 pixels according to Camera Link protocol, and transferred to PC via Camera Link interface. Finally, the images are acquired by image acquisition, decoded using software programmed with MATLAB, and stored in PC. Experimental results show that the system, whose effective resolution is up to 18.79 bit, achieves a resolution of 24 bit, sampling rate of 100 kHz and 4-channel synchronous data acquisition, and can transfer data stably and reliably. The system meets the requirements of high resolution, high sample rate and synchronous acquisition. In addition, it has good scalability and could be ported to other applications.关键词：data acquisition;FPGA;Camera Link protocol
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发布时间：2020-08-12 - 摘要：The pixel transmittance will increase over 20% by using UV2A technology, compared with MVA. This means that the UV2A results in reduction of power consumption and component for the back-light unit of LCD-TV. We have successfully developed 165 cm(65 in) UHD TFT-LCD panel using UV2A technology, which shows excellent optical performance, such as omni viewing angle, faster response time, ultra-high contrast ratio, etc. Cs-Swing 8-domain technology was adopted to further reduce the color shift. Cs lines with mesh structure were designed, in order to reduce the RC delay of Cs lines. We also developed a new hG-2D pixel structure with a new driving scheme to solve the problem of charging time shortage in 65 in panel with UHD resolution at 120 Hz.关键词：UV2A;8-domain;ultra high definition;pixel;charging time
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发布时间：2020-08-12 - 摘要：Based on R61581 display driver chip, a LCD drive method is proposed. It uses variable Static Memory Controller (FSMC) interface of STM32 to drive the LCD screen by R61581. paper proposes method about STM32 connected with R61581 and FSMC software configuration, and puts forward the basic character graphic display authentication methods. Experiment results of the method about FSMC is simple, LCD display costs less system CPU resources, 800×480 resolution screen refresh rate is 36FPS, can support most of the LCD screen driver.关键词：R61581;FSMC;refresh rate
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发布时间：2020-08-12 - 摘要：Due to the tiny pixel area of OLED-on-silicon microdisplay and the weak driving current, the driving MOS transistor operated in sub-threshold region is generally applied in the pixel driving circuit of OLED microdisplay. Unfortunately the sub-threshold current of MOS transistor is sensitive to the mismatch of threshold voltage and gate-source voltage and its peripheral circuit becomes complex, but a driving MOS transistor operated in saturation region instead of in sub-threshold region can avoid these problems. In this paper a pixel driving circuit for OLED microdisplay using the pulse width modulation (PWM) technique is proposed, in which the driving MOS transistor operates in saturation region, and the small average driving current and brightness are realized by shortening the operating time of OLED during a frame period. In the meanwhile the OLED pulse current is enlarged and the area of the MOS transistor operated in saturation region is decreased. The simulation results show that the average OLED current of the proposed PWM pixel driving circuit is from 27 pA to 2.635 nA, and the brightness of pixel is 2.19~225.1 cd/m2 correspondingly. The layout of the pixel driving circuit on silicon is realized among the pixel size of 15μm×15μm using double-pixel layout sharing technique.关键词：OLED-On-Silicon microdisplay;pixel driving circuit;pulse width modulation (PWM);driving MOS transistor;saturation region
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发布时间：2020-08-12
Driving and Controlling
- 摘要：Classic Retinex algorithm, applied in image enhancement with fixed Gaussian filter,couldn't meet demand of human vision. The result of Single Scale Retinex algorithm was unable to satisfy effective enhancement of the whole image, and it was difficult to use Multi-scale Retinex algorithm estimating illumination correctly without suitable coefficient. As a result, a novel scale varies algorithm of Retinex theory based on human visual masking effects was proposed. The results of human visual masking function, which can estimate how much details exist in the pixel neighborhood efficiently, was used to design the scale of Gaussian filter. The new algorithm was designed to get the correct illumination of a infrared image. At last, a practical solution was presented to cut down time consuming.Experimental results show that the proposed algorithm improves the contrast and enhance the details of infrared images. Moreover, the proposed algorithm is better than histogram equalization, Modified Contrast Limited Adaptive Histogram Equalization, single scale Retinex, Multi-scale Retinex and Stationary Wavelet and Retinex in subjective visual effects and objective evaluation parameters.关键词：image processing;image enhancement;Retinex method;human visual system
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发布时间：2020-08-12 - 摘要：Aiming at fuzzy C-means clustering algorithm lacking spatial information and large amount of calculation, an algorithm combined graph theory with fuzzy C-means clustering is presented in this paper. Firstly, the graph is divided into subgraph by graph theory algorithm. After that, clustering center of the subgraph is obtained by FCM algorithm. And then, a weighted distance based on the color of clustering center and space information is proposed as the merging criterion of union-find sets algorithm. Finally, the improved union-find sets is used to merge the regions of clustering results. The experimental results indicate that the proposed algorithm can ensure the quality of image segmentation with better performance.关键词：FCM;graph theory;union-find sets;image segmentation
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发布时间：2020-08-12 - 摘要：In order to detect all kinds of salient object in nature scene, we present a detection method which adds regional depth information of image to saliency computation, to apply to object detection. Firstly, we get several region through multi-level image segmentation. Then, we build the regression random forest by learning varieties of regional features, and use the supervised learning approach to map the regional feature vector to a saliency score. Finally, we fuse the saliency scores across multiple levels by least square method, yielding the saliency map. Experiments show our method can accurately locate the salient objects from RGBD images.关键词：object detection;depth information;regional feature;random forest;supervised learning
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发布时间：2020-08-12
Display and Image
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