最新刊期
期 5 ， 2009
- 摘要：White organic light-emitting diodes (OLEDs) have shown potential applications in flat-panel displays and illuminations due to the simple processing, low cost, easy adjustment of emissive wavelength in visible region and flexibility. This paper reviews the various approaches to achieve white OLEDs and their recent progresses, and introduces the fabrication methods of white OLEDs based on our recent work. The existing problems and the trends are also discussed.关键词：white light;OLED;illuminate;fluorescence;phosphorescence
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发布时间：2020-08-12
Invited Paper
- 摘要：Three kinds of isothiocyanate (NCS) liquid crystal materials with biphenyl group were synthesized by coupling reaction, nitration, reduction reaction, etc. The final products were confirmed with IR, NMR spectra. The phase transition temperatures were measured by polarizing microscopy accompanied with a thermal stage and DSC, the results indicated that all of them did not exhibit nematic phase. The Δn of the NCS LC materials detected by ellipsometer via mixed LC materials method was about 0.27, which is higher than other liquid crystal materials with biphenyl group. The response time of the liquid crystal mixture containing NCS material was 20% faster than the original LC material when the concentration of the NCS LC material is 10%. These data indicated that the NCS materials synthesized have high birefringence and fast response properties, and would have some application potential in liquid crystal modulators.关键词：isothiocyanate liquid crystals;synthesis;high birefringence;fast response
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发布时间：2020-08-12 - 摘要：Ethyl α-cyano-4-hydroxycinnamate was synthesized by 4-hydroxybenzaldehyde and ethyl cyanoa-cetate. Four ester liquid crystal compounds were synthesized by four chloride and ethyl α-cyano-4-hydroxycinnamate. 4-propylphenol α-cyano-4-hydroxycinnamate was synthesized by 4-hydroxybenzaldehyde and 4-propylphenol cyanoacetate. Two ester liquid crystal compounds were synthesized by two alkyl-cyclohexyl carbonyl chloride and 4-propylphenolα-cyano-4-hydroxycinnamate. All the compounds were characterized by MS, and their phase transition temperatures were measured by DSC. Ultraviolet absorption spectra of them were measured by UV spectrophotometer. Their properties of anti-UV in the liquid crystal mixtures were studied. The result shows that such compounds can be added to liquid crystal mixtures as UV absorbent, thus improving liquid crystal mixtures anti-UV properties.关键词：liquid crystal;α-cyancinnamate;ethyl cyanoacetate;Knoevenagel condensation
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发布时间：2020-08-12 - 摘要：The electrostatic potential (ESP) and dipole moments of typical oxygen-containing groups in nematic liquid crystals (NLC), for which the oxygen atom can lie in different position or connected with different groups, have been calculated by the DFT B3LYP/6-31G(d) level theory. When fluorinated groups connected with oxygen atom directly, their impacts on the ESP and dipole moments were analyzed. The connections between these ESP and dipole moments with the viscosity of NLC have been studied. The conclusions here are really helpful for the understanding of the electronic structure-viscosity relationship and for the molecule design of low viscosity NLC compounds.关键词：liquid crystal;oxygen atom;viscosity
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发布时间：2020-08-12 - 摘要：Red phosphor (Y, Gd)BO3 : Eu3+ was prepared by coprecipitation method with Y2O3,Gd2O3,Eu2O3 and H3BO3 as the starting material, oxalic acid as precipitant. The effect of the synthetic conditions on the relative luminescence intensity was discussed with orthogonal test. The optimal synthetic conditions were achieved as follows: noxalic acid/ncationic＝1.2 : 1, pH=8, supersonic time of cation mixing was 20 min, super-sonic time of precipitation was 1 h, calcined temperature was 650 ℃ and the time was 1 h, sintering temperature was 950 ℃ and the time was 2 h. The phosphor was characterized by Vacuum Ultraviolet test system for PDP, XRD and ESEM, respectively. The results showed that the samples exhibited the same diffraction patterns as appeared in JCPDS card No.188-0356 corresponding to the intrinsic diffraction patterns of hexagonal structure of YBO3 with the P63/m space group. The average particle size was about 300 nm.关键词：phosphor;coprecipitation method;relative luminescence intensity;orthogonal test
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发布时间：2020-08-12 - 摘要：This article reported three derivatives of 2,3,2',3' -terafluotolanes, which are prepared with 1-ethoxy-4-ethynyl-2,3-difluorobenzene and 1-alkylcyclohexyl-2,3-difluoro-4-iodobenzene (or 1-alkyl-2,3-difluoro-4-iodobenzene) by Sonogashira reactions.And the iodides are prepared with metal lithium reagents in low temperature from n-BuLi, alkylcyclohexanone and 1,2-difluorobenzene(or 1-alkyl-2,3-difluobenzene ) by a series of reactions. These compounds not only have large optical anisotropy(Δn) and large negative dielectric ansotropy(Δε) ,but also have wider nematic phase temperature rang by a series photoelectricity test and DSC analysis. These materials can improve the respond time and drive voltage in LCD.关键词：fluorinated liquid crystal;tolanes;Sonogashira cross-coupling reaction
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发布时间：2020-08-12 - 摘要：Polyimide(PI) is widely used as alignment layers in liquid crystal display industry, owing to their many excellent properties, such as heat resistance, dielectric properties, mechanical properties, chemical resistance, film-forming ability. One of the important parameters of alignment layers is pretilt angles of liquid crystal molecules. In this paper, a series of PIs containing biphenyl side chain polymerized from C6-DABBE/ODA/ODPA were synthesized via one-step method and two-step method. By means of ATR-FTIR,atomic force microscope (AFM), surface energy,X-ray photoelectron spectroscopy(XPS),the basic characters of PI films were investigated.The LC molecule alignment ability induced by polyimide alignment films and the profile of polyimide surfaces rubbed were also studied through pretilt angles.The results showed that liquid crystal on PI (C6-DABBE/ODA/ODPA) prepared by both one-step method and two-step method both could get good alignment.The pretilt angles of LC increased along with the density of side chain for higher enrichment of side chain on the surface, polyimides prepared by two-step method could show bigger pretilt angles.
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发布时间：2020-08-12
Material Physics & Chemistry
- 摘要：The triode-structure field emission display was a new vacuum flat display device, and the acquirement and maintenance of high-vacuum was one of necessary condition for the normal working display device. With the low-melting glass frit sintering process and glass spacer element, the high vacuum flat packaging for field emission display device was realized, and the packaging process including the device structure, device sintering, device exhausting and device getter-baking was improved. With the packaging technology, the triode-structure high-vacuum field emission display sample with carbon nanotube emitters was developed.关键词：display device;field emission;packaging;triode;vacuum
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发布时间：2020-08-12 - 摘要：ZnO thin films were grown on two kinds of substrates of Corning glass and α-Al2O3 by metal organic chemical vapor deposition. The properties of the films were studied. It was found the sharp diffraction peak for ZnO (002) by X-ray diffraction method, not only in the sample of the substrate of α-Al2O3(A), but also in the sample of the substrate of Corning glass(B), showing the two samples were highly c-axis oriented. The photoluminescence (PL) spectra of the ZnO films were studied. The UV emission at ~374 nm was found in sample A and B. The deep level emissions was found in the sample A, but not in the sample B, showing that the high quality ZnO films was grown on the substrate of glass. The surface morphology was studied by the AFM also. Though the average size of grain and the RMS(root-mean-square) value of the two samples is diffe-rent, comparing sample A with B, the result shows that sample A is more smooth. It can be found that the samples A and B were all grown in a column-by-column growth process.
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发布时间：2020-08-12 - 摘要：According to the characters of LCOS display and the various input video signal, the functions of the interface circuit are summarized. Taking the realization of the control circuit for LCOS FSC (field-sequential-colorization) display as an example, the design method has been particularly presented.
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发布时间：2020-08-12 - 摘要：Flexible transparent conductive oxide films have become a focus of research because of some unique advantages, such as light weight, flexibility, cost effective, etc. They are widely used in plastic liquid crystal display, flexible solar cell and unbreakable heat reflecting mirror. In this paper, the preparation techniques of flexible transparent conductive oxide films were reviewed. The advantages and disadvantages of the preparation techniques were analyzed. The treatments of flexible substrates were discussed. Finally, the application fields and future development of flexible transparent conductive oxide films are suggested.关键词：transparent;conductive;oxide films;flexible substrate
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发布时间：2020-08-12 - 摘要：A design method of the light guide plate microstructure with V-Cut slot was proposed, the principle that the V-Cut slot parameters effected the performances of the light guide plate was summarized. Then, different kinds of design methods of microstructure were compared through simulation and verification, and a prime arrangement was achieved, that was an arrangement of polynomial, the meanings of the parameters in the polynomial were summarized also and a design method of the V-Cut slot was concluded. Using this design method,high-performance light guide plate could be designed, the light utilization is high and the uniformity is more than 80%.关键词：light guide plate;V-Cut slot;capacity usage ratio;uniformity;LCD backlighting system
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发布时间：2020-08-12
Device Technology & Physics
- 摘要：By analyzing and studying the old gray scale modulation driving circuit and the characteristics of low work function printable field emission display(FED), a novel image restoration sub-row driving(SRD) technology was put forward. SRD technology can be applied to the display panel which does not have storage characteristic. Less buffer memory demand and higher display time usage ratio and so on can be obtained so that it is more suitable for FED panels driving. The working principle of the new image driving system and the execution method were introduced in detail. In order to satisfy the demand of the chip driving high-speed of the SRD method, some image data bits were reduced, while the application of error diffusion method was used to achieve true color image restoration. The technology had been successfully applied to FED driving system and developed a prototype color FED display. It can display color video images. Its diagonal is 63.5 cm(25 in), brightness is 300 cd/m2 and contrast ratio is 800 : 1.关键词：field emission display;gray-scale modulating;sub-row driving
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发布时间：2020-08-12 - 摘要：The hardware and software design thought and implemented method of Chinese character display system based on MCU control by taking graphical liquid crystal display LM3229 as an example have been dealt with. The display mechanism of Chinese character display is taken apart in detail. System program designing and analyzing adopts two display ways, text display way and graphical display way, comparing the advantage of each way in realizing Chinese character display. Meanwhile, system design and simulation have been completed on embedded system design platform Proteus ISIS. Therefore, the optimizing design project is obtained and the typical design example of Chinese character liquid crystal display control system is given.关键词：graphical liquid display;Chinese character liquid display;address coded of display RAM;module acquirement of Chinese character;system simulation
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发布时间：2020-08-12 - 摘要：TMS320F2812 digital signal processor and MGLS-12032 LCD module are introduced. The interface circuit between the digital signal processor and the LCD module is discussed. By designing a proper interface circuit between the DSP controller and the LCD module, the problem of electrical level compatibility is settled. According to the timing chart of the LCD module, this paper shows how to design LCD display program to control the LCD module properly. By this way the compatibility problem between a high speed device and a low speed one is solved well.关键词：TMS320F2812;MGLS-12032;LCD;interface;compatibility
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发布时间：2020-08-12 - 摘要：The article put out the problem of messy code appeared in dynamic display of LCD controlled by MCU. By studying the characteristic of eyes and the process of the display, the article analyzed the causes of confusion display when the LED was controlled by the MCU program. The experiments pros and cons proved the analysis of this article was right. The method how to solve the problem was given out.关键词：LED;dynamic display;MCU;messy code
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发布时间：2020-08-12 - 摘要：Application of TFT6448-5.7, a new type of TFT-LCD in controller of real time injection of die casting machine is introduced. The graphic liquid crystal display based on DSP is discussed combining with the application of TFT6448-5.7 in real time injection controller of die casting machine. With the environment of CCS exploring, programming design is written and debugged in the meaning while the hardware circuit is given.The junction circuit between TMS320C2812, the core chip adopted in this project and TFT6448-5.7 are provided for better understanding.关键词：TFT6448-5.7;TMS320C2812;die casting machine;C programming language
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发布时间：2020-08-12 - 摘要：By studying and analyzing the knowledge about how to use TMS320LF2407A DSP chip and LCM12864ZK LCD module, a LCD clock system which was the smallest system board based on TMS320LF2407A DSP chip was constructed. The system can display time on the LCM12864ZK LCD module and adjust time using button. The LCD clock system included two parts, hardware circuits and system program design. The hardware principles of the LCD clock system and main program flow charts were explained. The timers initialization procedures and the initialization procedure of the LCM12864ZK LCD module which was in accordance with the instructions of the LCM12864ZK LCD modules interface provided read and write timing under the conditions of the TMS320LF2407A DSP chip were provided.关键词：DSP;TMS320LF2407A;LCM12864ZK LCD module;interface
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发布时间：2020-08-12 - 摘要：An idea of TFT touch-screen display system design based on SOPC was presented. The hardware interface and the flowchart of software with relevant programs were introduced, the main procedure that the system hardware constitutes to design with software was given. After the design and debugging of the software were completed, the entire project was compiled in Quartus Ⅱ environment and was downloaded in EPCS4 chip. The display result of the system was clear and stable,the design requirements was achieved entirely.关键词：Nios Ⅱ;SOPC system;TFT touch-screen;FPGA
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发布时间：2020-08-12
Driving & Controlling
- 摘要：For a typical portable handset, substantial energy savings can be achieved by dimming backlight intensity levels, but it also decreases the contrast and brightness of the displayed image. This paper analyzes the characteristics of TFT-LCD and Human Visual System (HVS), and then presents a dynamic dimming backlight algorithm to reduce power consumption while complementing image luminance and contrast to maintain the image quality. The algorithm proposed can choose backlight complementary method according to the contents of images, so it can achieve higher luminance than traditional methods. The experimental results indicate that the power dissipation of backlight can be significantly reduced while the desired image quality is maintained.关键词：TFT-LCD;backlight;image luminance complement;contrast
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发布时间：2020-08-12 - 摘要：An approach for reducing LCD motion blur with using focusing all-pole techniques is presented in this paper. A two-dimension all-pole filter is established and employed in processing video signal. The image display properties is also tested by a imitation method. The results show that focusing all-pole filter can reduce the LCD motion blur, especially suited to the higher frequency band of the images signal.关键词：TFT-LCDs;motion blur;focusing all-pole filter;video processing
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发布时间：2020-08-12 - 摘要：The inner structure of an array CCD device with 33M pixels made by Dasal corporation is introduced, and the driving schedule is analyzed in detail. Since the disadvantage of high sensitivity CCD which has lower frame rate, a design method of the full frame CCD drivers based on FPGA is put forward. To increase the frame rate by getting four outputs at the same time, the bias voltage circuit is improved. The frame rate reaches 2.7 f/s, effectively increased by about 4 times, compared with 0.7 f/s with single output. The system takes Field Programmable Gate Array (FPGA) as the key device and driving schedule generator has been described with VHDL. The designed generator has successfully fulfilled system simulation with ISE and Modelsim. It is proved that the driving system can meet the demand of the CCD in high frame rate application.关键词：array CCD;driving circuit;high frame rate;field programmable gate array;simulation
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发布时间：2020-08-12 - 摘要：According to the communication protocol of inner system of certain aerial camera focusing system, this paper investigated the real-time display method of the aerial camera focusing system during communication. A new method of real-time display using simulation technology was presented based on computer arithmetic control and communication control circuit.The work principle of the aerial camera focusing system was described;the circuit was designed; the flow of the software was described. The camera crew under the simulation software basing on VC ++ 6.0, can also focus on the four camera system control with the features of simple operation and high reliability.关键词：aerial camera;focusing system;simulation control;encoder
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发布时间：2020-08-12 - 摘要：The method of controlling the speed of cooling wheel with the position of the adhesive tape is proposed. The position of the adhesive tape is gained with the CMOS digital camera. Based on the core of FPGA, two pieces of SRAM are used in the system to achieve ping-pong operation . According to the synchronous signal produced by CMOS camera, the image is sampled and stored into one of the two SRAMs by FPGA. At the same time, the image data stored in the other SRAM is read out and processed. To detect the position of the adhesive tape, the method of grey is used. One sampled image and the simulation result are given. The sampled image shows that the image quality of the CMOS camera satisfy the need of the project. The simulation result shows that the SRAM ping-pong operation is realized and the position detection of the adhesive tape is completed. The system is connected with the cooling wheel speed control system and works reliably.关键词：CMOS digital camera;position detection;FPGA;OV6620
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发布时间：2020-08-12 - 摘要：In order to monitor the state of control cell of TDI CCD of multi spectrum space optics remote device and test the function and reliability, a novel detection system of CCD signals for space optics system is designed. By using the FPGA, 48 clock drivers and 31 DC bias signals are all analyzed and detected simultaneously. At the same time, solutions of the detection are transmitted to PC. All models such as A/D control, logic analysis and UART are integrated in the FPGA. Experiment results show the detection system can exactly monitor the state of the controlling cell of TDI CCD. It totally satisfies the requirements for detection of TDI CCD of multi spectrum space optics remote sensing device.关键词：space optics remote sensing device;FPGA;TDI CCD;detection
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发布时间：2020-08-12 - 摘要：An image sharpening algorithm for small size TFT-LCD was proposed based on the architecture character of one-chip TFT-LCD driver IC. The proposed algorithm uses a novel unsharp masking algorithm. By considering the characteristics of the human visual system and adding the energy dispersion filter, the proposed algorithm improves the sharpen result by reducing the noise and overshoot artifacts and avoiding the color distortion. The proposed algorithm is easy to be implemented and has a very low hardware cost, furthermore, the quality of image can be optimized by adjusting registers values. The proposed algorithm especially suits for small size TFT-LCD devices,such as cell phone, etc.关键词：unsharp masking algorithm;image sharpening;TFT-LCD
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发布时间：2020-08-12 - 摘要：A S-form functional representation of tone reproduction curve of liquid crystal displays was proposed by analyzing on the S-shape function and the S-curve function. In the experiments, tone reproduction curves (TRCs) of two LCD displays and a CRT display were measured by X-Rite Monitor Optimizer, and were fitted by the S-shape function, the S-curve function and the S-form function. Experimental results showed that S-form function fit the measured TRCs better than S-shape function and S-curve function, and that the S-form function is applicable to not only LCD displays but also CRT displays.关键词：LCD display;tone reproduction curve;fitting
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发布时间：2020-08-12
Imaging Technology & Image Processing
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