最新刊期
期 1 ， 2011
- 摘要：A conjugated polyfluorene copolymer with broad emission in the visible region was synthesized by Stille coupling reaction through the polymerization between 2,5-bis(tributylstannyl) thiophene, 4,7-dibromo-2,1,3-benzothiadiazole and 2,7-dibromo-9,9-dioctylfluorene. The obtained copolymer possessed of broad emission spectrum in visible region with the peak of 470.7, 498.9, 654.2 nm, indicating the potential application in polymer white emission materials.关键词：broad emission;polyfluorene;copolymer;optical spectral property
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发布时间：2020-08-12 - 摘要：A series of chiral liquid crystals were synthesized through Mitsunobu reaction and the yields varied from 63% to 71%. The compounds were characterized by IR, 1H NMR, MS. The mesomorphic property of objective compounds was investigated by DSC and POM. The helical twisting power (HTP) was determined by Canos wedge method. It was found that HTP increased with the increase of the number of Fluorine atom attached to aromatic ring.The inducing of fluorine atom to aromatic ring influence the rotation of C—O bond, then chiral moleculer has small number of conformation and exhibits high HTP.关键词：chiral liquid crystals;Mitsunobu reaction;helical twisting power;conformational isomers
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发布时间：2020-08-12 - 摘要：A white organic light-emitting device was realized by using TBPe and DCJTB as fluorescent dopant. The configuration of the devices is ITO/2T-NATA(15 nm)/NPB(25 nm)/ADN ∶ TBPe ,ADN ∶ TBPe ∶ DCJTB(x nm)/Alq3(20 nm)/LiF(1 nm)/Al(100 nm),and the ADN ∶ TBPe/ADN ∶ TBPe ∶ DCJTB layer are used as emitting layer. The emission properties of devices by adjusting the thickness of ADN ∶ TBPe ∶ DCJTB layer has been researched. The results show that when the thickness of the ADN ∶ TBPe ∶ DCJTB layer gradually ranges from 2 nm to 8 nm, the electroluminescence spectra shift from blue-light region to white-light region. A white light with CIE coordinates of (0.38, 0.34) was achieved when the ADN ∶ TBPe ∶ DCJTB layer was 8 nm, which is located in the white-light region.关键词：OLED;white emission;mixed deposition
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发布时间：2020-08-12
Table of contents
- 摘要：Polyimide (PI) was synthesized by copolymerization of PMDA, MDA and TBCA in this paper. The films prepared by PI can induce the same vertical alignment before and after rubbing. The effect of content of TBCA on the alignment property was discussed, the relative content of surface side chains was observed by the ATR-FTIR spectra of the PI films surface, and the effect of the microgrooves on the liquid crystal was investigated by atomic force microscope (AFM). The PI films without microgrooves before rubbing can align liquid crystal molecules. Moreover, the content of surface side chains of this PI films before rubbing is the same as that after rubbing.关键词：vertical alignment;polyimide;alignment films;side chains;microgrooves
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：A low dielectric material, acrylate resin has been investigated as a passivation dielectric layer for thin-film transistor (TFT) arrays in this paper. Compared with the conventional nitride film (SiNx, ε≈7), the acrylate resin passivation layer exhibits a flat surface and a low dielectric constant (ε≈4.5) which lowers the RC delay in a device. The high transmittance and good planarization characteristics of the low dielectric acrylate resin film enhance the brightness and aperture ratio of thin film transistors liquid crystal displays (TFT-LCDs), and lower the manufacture cost.关键词：TFT LCD;low dielectric constant;acrylate resin;passivation layer
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发布时间：2020-08-12 - 摘要：The pinholes on the surface of alignment layer was studied, which formed during the TFT-LCD manufacturing process and caused defects of the products. Herein, a vitally typical defect, black spot, was analyzed via FIB, SEM and OMS. The analysis results of statistical software BO (Business Objects) show that the pinhole is the main cause of the black spot. Based on theoretical analysis and further experimental results, it is found that the hydrodynamic instability of the solution may lead to the pinholes on the alignment layer surface, and the pre-cure time of the alignment film solution is significantly responsible for hydrodynamic instability. It is noteworthy that the instability needs times to grow full enough and then to influence the film structure. Therefore, the pinholes on the alignment layer surface will be reduced or eliminated if the pre-cure time is less than or equal to that time.关键词：TFT-LCD;alignment;pinhole;pre-cure;failure analysis;hydrodynamic instability
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发布时间：2020-08-12 - 摘要：A channel thermal impedance model for amorphous silicon thin film transistor is derived from a system of coupled energy equation, heat flowing equation and boundary conditions. By the use of this model, the average temperature in the active region can be calculated. Then, by considering of the effects of field oxide and interconnects between devices, a two dimensional thermal model is developed. By the use of this model, the temperature distribution in the channel can be described and the maximum junction temperature can be calculated. The accuracy of the proposed model has been verified with the device simulation data.关键词：amorphous silicon thin film transistor;thermal resistance;self-heating effect;temperature distribution
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发布时间：2020-08-12 - 摘要：How to compensate OCB mode and get the optimal parameters of the compensation films for high contrast ratio are analyzed. The iso-contrast contour and response time were calculated for four compensating schemes with the optimization results. The maximal contrast ratio is greater than or equal to 2 200 and the response time is less than 2 ms in any compensating schemes.关键词：optical compensated bend;film-compensated;response time;contrast ratio;viewing angle
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发布时间：2020-08-12 - 摘要：The performance of yellow organic light-emitting devices (OLEDs) based on a novel material with an emitting/hole-transporting layer as an acceptor was investigated. These devices were fabricated as follows: ITO/2T-NATA(30 nm)/NPBX ∶ 25% CzHQZn(x nm)/BCP(10 nm)/Alq3(60-x) nm/LiF(0.5 nm)/Al(x: the thickness of doping layer). The x is 15,20,25,30 nm, respectively, the thickness of Alq3 is correspondingly changed, the total thickness of doping layer and Alq3 is a constant of 60 nm.When x is 20 nm, the thickness of Alq3 is 40 nm, a yellow OLED can be obtained with the CIE coordinates of (0.514 6,0.470 5),the luminance of 1.078 cd/m2 at 4 V. The maximum luminance is 449 0 cd/m2 at 14 V, and the maximum luminous efficiency is 0.98 cd/A.关键词：organic light-emitting devices;emitting layer;CzHQZn;performance
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发布时间：2020-08-12 - 摘要：Transparent conducting Ti, Ga co-doped zinc oxide films(TGZO) with high transparency and relatively low resistivity have been successfully prepared by DC magnetron sputtering at room temperature. Micro-structural, optical and electrical properties of TGZO films were investigated. XRD photos indicate that the sputtering pressure plays an important role on the microstructure and electrical resistivity of TGZO films. The electrical resistivity decreases when the sputtering pressure increases from 1.0 Pa to 11 Pa. When the sputtering pressure is 11 Pa, it is obtained that the lowest resistivity is 1.48×10-4 Ω·cm. The electrical resistivity increases when the sputtering pressure increases from 11 Pa to 16 Pa. All the films present a high transmittance of above 90% in the visible range.
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发布时间：2020-08-12 - 摘要：An optoelectronic device current-voltage (I-V) testing platform was established based on the software LabVIEW, including a PCI-GPIB card from American National Instrument (NI) Corporation as well as 6517 Electrometer/High Resistance Meter from Keithley Corporation. Using the LabVIEW program to control Keithley6517, the system has the function of collecting, displaying, storing and analyzing the voltage and current data through the GPIB card. It can also draw the I-V characteristic curve according to the measured data and figure out the relevant parameters of different devices.In this paper, taking solar cell as an example, it figures out the open voltage (Voc), short current (Isc), maximum power (Pm), fill factor (FF) and percentage of conversion efficiency (PCE) of the solar cell. Through contrast test and correction, this system has a maximum error of 0.18%. This system not only has a high degree of automation, but also has a high degree of accuracy and reliability. And it not only can be used in laboratory teaching, also can be used in the factory for solar cell and thin film transistor products performance testing.关键词：optoelectronic device;virtual instrument;Labview;SCPI commands
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发布时间：2020-08-12 - 摘要：In order to improve the current manual testing situation based on discrete devices, a comprehensive photoelectric property testing system with a core of microcontroller is introduced in this paper, and the software and hardware design of this system are discussed in detail. The photoelectric properties of luminescent devices can be measured simultaneously by using a single platform which makes the experiment computerized,and has advantages of high integrity, convenient and accuracy.关键词：OLED;photoelectric properties;testing system
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发布时间：2020-08-12
Device Technology & Physics
- 摘要：A kind of universal serial TFT-LCD display terminal with ATmega128L as the 2nd driver is designed and implemented. SPI serial Flash is employed to store multiple sets of ASCII and GB2312 character matrix data and background images. High level display commands from external master controller could be received through RS232 or RS485 standard interface and trigger requested display operations. Actual applications reveal that this terminal could help to reduce display control burden for master controller and could be used as universal information output device for many kinds of microcontroller-based systems.关键词：TFT-LCD;LCD driving;serial interface;serial Flash;ATmega128L
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发布时间：2020-08-12 - 摘要：A single driver chip based on dynamic scanning is developed for Liquid Crystal Display (LCD). The chip is a high voltage CMOS IC with mixed signals and offers optional output frequencies. The input data frequency of the chip is 13.5 MHz, and the 256 columns output voltage signals directly drive the LCD. The output signal range of every column is over 12 V, which is divided into 1 024 levels. The max-range rising/falling time of the output signal can be less than 5 μs when load capacitor is 200 pF. The chip has been realized in Chartered 0.35 μm 18 V high voltage process and the layout is designed carefully to minimize the mismatch error. Post layout simulation results illustrate that the design can well accord with the specification.关键词：LCD;display driver;CMOS;high voltage mixed-signal
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发布时间：2020-08-12 - 摘要：In order to satisfy the need of industry automation and the revelation requirement of the testing system, the control system of LCD module LM6800 is designed based on high-speed MCU. The hardware principle graphics and the software flow chart are provided in this paper. The testing results demonstrates that the control system is correct and practical.关键词：LCD;high-speed MCU;C8051F120;LM6800
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发布时间：2020-08-12 - 摘要：Based on the characteristics of low-power MSP430 MCU, the paper proposes an idea that constant current source control the brightness of LED. In a specified time, MCU selects the brightness of LED’s demand by collecting the background light and detecting the infrared signal of human, writes the number of output voltage in D/A converter. And the output voltage by D/A is the input voltage of constant current source which control the voltage of transistor base pole indirectly and lets it produce different output current value. Then the system can accomplish adjustable brightness of LED through the number and finally complete LED’s light intensity of intelligent control.
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发布时间：2020-08-12
Driving & Controlling
- 摘要：A kind of solid volumetric true 3D display device was developed in this paper. The sample device consists of a single DMD, a UHP of 200 W power, a color wheel of RGBRGB and 240 Hz, 20 LC shutters, projection lens, folder mirrors, control circuits, etc. The colorimetric characters of the display device were studied. The color gamut reaches 53.8% of NTSC standard, and the color temperature is 5 401 K. Color wheel is one of key factors affecting the gamut. The color gamut can increase to 69.7% of NTSC standard with the involvement of a new color wheel.关键词：colorimetric characters;true 3D display;color gamut
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发布时间：2020-08-12 - 摘要：This paper put forward an available method aimed at the requirements of aerial camera with multi-mode. Driving schedules of interline transfer progressive scan KAI-2093 CCD sensor produced by Kodak corporation have been examined based on the structure and theory of dual-channel transmission. Three kinds of driving mode have been designed: binning,no-binning and TDI mode. The design takes the FPGA EP1C6Q240 produced by Altera corporation as the schedule generator to realize data cache and mosaics. QUARTUSII7.0 has been chosen as the software design platform. Driving schedule generator is described with VHDL. The design of data cache and mosaics has been fulfilled though simulation by Modelsim AE6.1b.Experimental results indicate that the schedule can output CCD signals at the speed of 60 frames/s, 120 frames/s etc in binning mode, which can meet the requirements of moving target tracking with high speed; and can output full frame at the speed of 30 frames/s in no-binning mode;and does not affect image quality for long-time working in TDI mode. The system integration and anti-jamming capability have been improved.关键词：aerial camera;binning mode;TDI mode;data cache;data mosaics;FPGA
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发布时间：2020-08-12
Imaging Technology & Image Processing
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