Liquid Crystal Display Projector Research Articles

Hubungan Penggunaan Media LCD (Liquid Crystal Display) Proyektor Terhadap Hasil Belajar Matematika Siswa Kelas V SDN Sungkai 1 Kabupaten Banjar

This study aims to determine the effect of using LCD projectors on Mathematics learning outcomes in grade V students of SDN Sungkai 1 Banjar Regency. The population in this study was all grade V students of SDN Sungkai 1 Banjar Regency with a total of 56 students. The research method used in this study is quasi experiments with non-equivalent control group design. Data collection techniques are observation and tests. Data analysis techniques use quantitative data analysis, namely correlation analysis. When viewed from the average posttest value and calculation using the N-Gain formula with results of 0.22 where 0.22 ≤ 0.30 in the low category for the control class and 0.52 where 0.30 ≤ 0.52 ≤ 0.70 with the medium category for the experimental class, it can be concluded that there is an influence of the use of LCD (Liquid Crystal Display) projector media on the mathematics learning outcomes of grade V students of SDN Sungkai 1 Banjar Regency. Teachers should be able to use LCD projectors in learning to increase students' interest in learning

IMPLEMENTASI PENGENDALI LAYAR PROYEKTOR DENGAN ANDROID

The use of Liquid Crystal Display (LCD) in daily activities is often hampered because you still have to use a laptop or computer for features to deliver presentations, therefore this research designed an LCD projector control system using a smartphone, where the LCD projector can be controlled using a smartphone, either it turns on, turns off, or whoever the source of information or video that wants to be displayed on the LCD projector can only use a smartphone. This system uses a Raspberry Pi as the link between the LCD projector and the smartphone, the screen display from the smartphone will be sent to the Raspberry Pi via a wifi network, which will then be displayed on the LCD projector. As well as in tests that try to measure the strength of the WIFI signal against the distance obtained if this system can run properly with a maximum distance between the smartphone and raspberry pi 18 meters. And the ideal distance is 10 meters. As well as for the Quality of Service (QoS) test, the average delay value resulting from measurements from various points is 359ms. And the average throughput value is 169.3KBps.

Large size lenticular shaped phosphors-in-glass by Isobam-APS gel casting to act for converting and condensing in LCD projector

White light diodes (WLEDs) composed of blue chip and phosphor-converter are widely used in liquid crystal display (LCD) projectors as backlights. And it often needs a condenser lens to irradiate white light onto the LCD screen. In this paper, a large size lenticular shaped phosphors-in-glass (PiG) was prepared by Isobam-APS gel casting for the first time. The PiG could act for converting and condensing in LCD projector. Then a rectangular light spot similar to the shape of LCD screen was obtained to reduce the loss of light. The maximum temperatures of the chip and PiG were 62.1 °C and 57.3 °C respectively after working for 600 s and gradually stabilized by simulation. It was proved that simulation result was reliable through comparing with the actual measured value and the lenticular shaped PiG had good heat dissipation capacity for its large area. In conclusion, this is a successful application of PiG in LCD projector, which has guidance and promoting effect.

Low-Cost 3D-PTV Utilizing Rainbow Light Illumination And Artificial Neural Network Applied To Rayleigh-Bénard Convection

Building on the novel methodology for three-dimensional (3D) color particle tracking velocimetry (PTV) proposedearlier by our research group, an improvement and an evaluation of the method is presented in this study. The method utilizes only a color camera and a consumer-grade liquid crystal display projector (LCDP), and thus cost for implementation is greatly lower than that required for a tomographic system. Employment of artificial neural network system enables to eliminate human decisions in constructing a color-to-depth conversion function. That is, the calibration can be performed automatically once relationship between particle color and depth are associated in actual measurement environments. The method was tested in a Rayleigh–Bénard convection of water, which is expected to have horizontally isotropic structures. Two different flow states were successfully measured. The results showed that the 3D color PTV can measure the same statistics of velocity components in the in-plane and out-of-plane directions. Considering all the results, the proposed method using only a single camera and an LCDP has a potential to be an alternative to the state-of-art tomographic measurements.

Medical student’s perception on teaching-learning methods of pharmacology in a medical college

Background: To know the Medical student’s perception on teaching and learning methods of pharmacology in a medical college attached to tertiary care hospital.Methods: This is a questionnaire based study conducted in a medical college. A pre-validated, pre-designed questionnaire containing 22 points was given to 5th semester students to know their perception on teaching and learning methods.Results: Analysis was done on 150 medical students of a tertiary care hospital. Among them, 80 % wanted the faculty members to make more utilization of Audio-Visual aids for effective learning. 78.67 % students wanted to include case based learning in the curriculum and 86.67% wanted more of the clinical pharmacology to be introduced. A 28% wanted MCQs (Multiple Choice Questions) to be included in the assessment of academic performance. A 13.33% felt that the ideal teaching method for learning pharmacology was didactic lectures. A 65% thought ideal teaching/learning media for pharmacology was the combination of LCD (Liquid Crystal display) projector and blackboard.Conclusions: The study revealed the ideal teaching and learning methods in pharmacology for the betterment of students.

Barriers in using computer related teaching aids among faculty members in a newly established medical college - a Cross Sectional Study

International Journal of Medicine and Public Health,2016,6,4,170-174.DOI:10.5530/ijmedph.2016.4.5Published:November 2016Type:Original ArticleBarriers in using computer related teaching aids among faculty members in a newly established medical college - a Cross Sectional StudyBishwalata Rajkumari Bishwalata Rajkumari* Department of Community Medicine Jawaharlal Nehru Institute of Medical Sciences, Porompat Imphal, Manipur, INDIA. Abstract:Introduction: Teaching aids are tools which make teaching easier and learning more effective and enjoyable. Newer aids like computers and LCD (Liquid Crystal Display) projectors have been widely adopted in education system to make teaching process more effective. The study plans to assess the knowledge, attitude & practice of newer form of teaching aids and identify the barriers to use among faculty members of a newly established medical college. Methods: A cross sectional study was conducted using both quantitative and qualitative methods among faculty members of Jawaharlal Nehru Institute of Medical Sciences, Imphal during September 2014 to Feb 2015 using a self-administered semi-structured questionnaire along with interview guides for in-depth interview. Approval from the Institutional Ethics committee was obtained. Descriptive statistics and chi-square test were performed and qualitative data was grouped into domains and coded responses were analysed in consonance with stated objectives. Results: Out of the 88 respondents 55 (62.5%) were males and 23 (26.1%) faculty were above 65 years of age. Around 13.6% of the respondents said they do not have basic knowledge of computer. ‘Feel too old to learn’, 7 (58.3%) was main reason for not having knowledge of computers. Majority of the respondents, 78 (88.6%) used computer in taking theory/lecture class. One-third of the faculty, 33 (37.5%) said they need help/assistance in preparing power-point presentations and almost two third of them, 53 (60.2%) have undergone Basic training course in MET (Medical Education Technology). Senior faculty expressed that ‘Older generation thinks old is gold and are more habituated to older teaching methods’. Conclusion: Old age and lack of computer knowledge were the major barriers identified. Compulsory training in basic course on MET along with faculty development programs with short course on computer is the need of the h. Keywords:Computers, Faculty Development, Information Technology, Medical education, Teaching AidsView:PDF (135.78 KB)

Parametric study using distributed computing and genetic algorithm in TFT‐LCD projector

AbstractWe present an analysis of the parameters affecting light engines in liquid crystal display (LCD) projectors, using actual LCD projectors as examples. The significant parameters affecting light engines in LCD projectors are evaluated using the light uniformity as the determining standard. Optimization is performed on those parameters that affect the uniformity as well as the rendering effects of the projectors, by employing our own distributed genetic algorithm. The rotation angle of the collimator and its position are shown to improve the uniformity of the LCD projection, but we find that their effect on improving the brightness is not significant. Increased length of a projectors' light tube promotes better integration results. In our study, we effectively improved the performance index of an LCD projector, increasing projection uniformity by 4% (to 91.5%) and the brightness by 12% (to 7.9 lm).

Development of Microfabrication Technology with Maskless Photolithography Device Using LCD Projector

The maskless photolithography device we developed requires no photomask, by modifying Liquid Crystal Display (LCD) projector optics from magnified to reduced projection. The second-generation device we developed produces a practical centimeter-scale micropattern by dividing a large mask pattern and divisionally exposing it synchronized with an auto-XY stage, applying it to cellmicropattern and microfluidic device production. Although advantageous in producing maskless micropatterns, problems arise in jagged pattern boundaries due to the liquid crystal panel structure and collapse pattern of the boundary divided on divisional exposure using the auto-XY stage. The third-generation maskless photolithography device we developed had a more accurate auto-XY stage and solved problems caused by hardware through software such as control of the auto-XY stage.

Simplified electroholographic color reconstruction system using graphics processing unit and liquid crystal display projector

We have constructed a simple color electroholography system that has excellent cost performance. It uses a graphics processing unit (GPU) and a liquid crystal display (LCD) projector. The structure of the GPU is suitable for calculating computer-generated holograms (CGHs). The calculation speed of the GPU is approximately 1,500 times faster than that of a central processing unit. The LCD projector is an inexpensive, high-performance device for displaying CGHs. It has high-definition LCD panels for red, green and blue. Thus, it can be easily used for color electroholography. For a three-dimensional object consisting of 1,000 points, our system succeeded in real-time color holographic reconstruction at rate of 30 frames per second.

10301 X線CTを活用したリバースエンジニアリング(計算機シミュレーションとその応用(1),OS.14 計算機シミュレーションとその応用)

A system of Voxel CFD (Computational Fluid Dynamics) simulation technology cooperated with high energy X-ray CT (Computed Tomography) is developed. Computational model is obtained from "real object" using industrial X-ray CT, and then several CAE (Computer Aided Engineering) simulations are executed. These simulations are called "convergence technology simulations". They are expected to investigate the effect of difference between real product and 3D-CAD (Computer Aided Design) model, and improve the quality of products. Many of the past convergence technology simulations treated single material mechanical part because of the simplicity to obtain the model and to generate computational grid. In this study, a detailed 3D model of LCD (Liquid Crystal Display) projector, which is made of some materials such as glass, resin and metals, is obtained, by high energy X-ray CT, and flow simulation inside the whole body of the product is executed using Voxel CFD simulation to enable to generate computational grid, even if the geometry is highly complicated. The computational results are compared with the result of simulation from 3D-CAD model.

Maskless liquid-crystal-display projection photolithography for improved design flexibility of cellular micropatterns

We previously developed an all-in-one photopolymerization device by modifying a commercially available liquid crystal display projector (LCDP) for the preparation of micropatterned surfaces and microfluidic channels without the need for expensive photomasks. In the present study, we demonstrate a simple and reliable method for rapid prototyping of cell micropatterning with high resolution using the modified LCDP device. Fabrication of complicated and flexible patterns was achieved using this device with positive-type photoresist in a two-step process. First, micropatterns on the silanized coverslips were fabricated from positive photoresist. Second, acrylamide monomer solution containing polymerization initiator was dropped onto the micropatterned positive photoresist and copolymerized on the silanized coverslips in situ by thermally initiated radical polymerization. After the reaction, the remnant micropatterned photoresist is easily dissolved, resulting in a polyacrylamide-silane micropattern on the coverslip. The resultant polyacrylamide layer is highly hydrophilic and repels both protein adsorption and cell adhesion. Cells seeded on the micropatterned surfaces therefore attach and spread only on unpolymerized silanized glass surfaces, conforming to the pattern design. This technique is therefore useful for inexpensive, rapid prototyping of surface micropatterns using polymer materials.

A new liquid crystal display-based polarized stereoscopic projection method with improved light efficiency

In this paper, a new liquid crystal display (LCD)-based polarized stereoscopic projection method with improved light efficiency is suggested. In the proposed system, two external polarizers are taken away from the conventional LCD polarized stereoscopic projection system by effectively taking into account of inherent polarization properties of the LCD projectors, so that light efficiency of the proposed system can be dramatically improved. From some experimental results with the Type-1 LCD projectors of NEC MT 1060R, it is found that the proposed system shows minimum light loss in the polarization process and the resultant stereoscopic image projected from this system is 213%, 75% and 300% brighter than those projected from the conventional Type-1 LCD projector-based, Type-2 LCD projector-based and Type-3 projector-based systems, respectively.

Numerical Simulation of Unsteady Turbulent Flow by Voxel Method

A fluid analysis system that automatically and quickly generates meshes by the so-called voxel method was developed. This system was applied to calculate the flow characteristics in a magnetic disk drive, an LCD (Liquid Crystal Display) projector, a volute-type mixed-flow pump, and around an elevator. These calculations agreed well with the experimentally measured characteristics; thus it can be concluded that the developed voxel-method-based fluid analysis system can be successfully applied to numerical simulation of the fluid flow for designing turbomachinery and other fluid-engineering devices with complicated boundary forms.

Preparing Medical Students for a Filmless Environment: Instruction on the Preparation of Electronic Case Presentations from PACS

Rationale and Objectives As the use of picture archiving and communication systems (PACS) expands and radiology departments become increasingly filmless, it will become increasingly necessary to teach physicians how to use PACS and download diagnostic images. The authors developed an instruction method in which medical students enrolled in a radiology clerkship were taught how to use the PACS, download digital images, and incorporate them into an electronic case presentation. The feasibility and potential benefits of this instructional method were studied prospectively. Materials and Methods Between June and October 1999, all 36 medical students enrolled in Harvard Medical School' core radiology clerkship at Massachusetts General Hospital, Boston, were required to give an electronic radiology case presentation with images downloaded from the departmental PACS. They were taught how to download images, edit them, and then import them into PowerPoint software. They were also given access to the hospital information system to obtain pertinent clinical information. At the formal presentations, the images were displayed with a liquid crystal display (LCD) projector. The students were surveyed on the 1st and last days of the clerkship regarding their learning experiences. Results Before the radiology clerkship, 81% of the students had never given an electronic presentation with computer and LCD projector, 83% had no PACS experience, and 56% had no PowerPoint experience. All students learned to prepare and deliver electronic presentations of radiologic cases downloaded from PACS. Their presentations were informative, innovative, and entertaining, and the images were well displayed. The students praised the instruction highly and thought their new skills would serve them well. Conclusion Teaching medical students how to prepare and deliver electronic presentations of radiologic cases downloaded from PACS proved to be very feasible and well appreciated by the students.

P‐80: Novel Polarization Conversion System for LCD Projectors

AbstractA novel polarization conversion system for liquid crystal display (LCD) projectors is presented to improve light efficiency and uniformity. An offset design is employed in array plates to provide dual light paths for converting random polarized light into linearly polarized light. Additionally, the system performs shape conversion to yield a uniform illumination beam with a rectangular cross section.

Liquid-crystal-display projector-based modulation transfer function measurements of charge-coupled-device video camera systems

We demonstrate the ability to measure the system modulation transfer function (MTF) of both color and monochrome charge-coupled-device (CCD) video camera systems with a liquid-crystal-display (LCD) projector. Test matrices programmed to the LCD projector were chosen primarily to have a flat power spectral density (PSD) when averaged along one dimension. We explored several matrices and present results for a matrix produced with a random-number generator, a matrix of sequency-ordered Walsh functions, a pseudorandom Hadamard matrix, and a pseudorandom uniformly redundant array. All results are in agreement with expected filtering. The Walsh matrix and the Hadamard matrix show excellent agreement with the matrix from the random-number generator. We show that shift-variant effects between the LCD array and the CCD array can be kept small. This projector test method offers convenient measurement of the MTF of a low-cost video system. Such characterization is useful for an increasing number of machine vision applications and metrology applications.

Hybrid LCD panel system and its color coding algorithm

A color liquid crystal display (LCD) panel typically used in consumer products is composed of R, G, and B subpixels. Due to the subpixel structure and color microfilters, a single LCD panel system (SLPS) using such a panel has a low resolution, low brightness, and a poor appearance of the individual color pixel elements. These problems are solved by having a three LCD panel system (TLPS) which is composed of three black/white (B/W) LCD panels. However, this system requires high cost and high hardware (H/W) complexity. We propose a new LCD system using B/W and color LCD panels called the hybrid LCD panel system (HLPS) to overcome the drawbacks of other types of LCD panel applications. Also, the associated color coding algorithm for maximizing the effect of the proposed system is developed. In spite of using the simplified H/W structure, little visual difference has been attained in comparison with the TLPS in the terms of the resolution and brightness, and the color fidelity is better than the SLPS. Among the three types of the LCD projector, the 7.34% light utilization efficiency of the HLPS is the highest. Also, the HLPS is compact and relatively inexpensive.

Photochemical decomposition mechanisms for AZ-type photoresists : J. Pacansky and J. R. Lyeria. IBM J. Res. Dev.23, (1) 42 (January 1979)

Photolithography has been applied to biological applications such as cell and protein micropatterning and the fabrication of microfluidic channels. However, the preparation of photomasks for projecting micropattern lighting images is often time consuming and costly. Therefore, we have developed maskless photolithography devices by modifying the optics of commercially available liquid crystal display (LCD) projectors from extended to reduced projection. The developed second and third devices produce practically a centimeter-scale micropattern by dividing an original large mask pattern into several patterns, which are individually and synchronously exposed to substrates with a motorized XY-stage, applying them to cell micropatterning and polydimethylsiloxane (PDMS) microfluidic device production. The first part of this chapter describes the developments of the maskless photolithography devices. The second part describes the exposure control system with a motorized XY-stage. The third part describes the applications of devices to cell micropatterning. The last part describes the application of the devices to the fabrication of the PDMS microfluidic channel. Maskless photolithography with an LCD projector has a large advantage with no requirement for a photomask. In particular, the maskless photolithography devices show a greater power by optimizing the conditions of pattern size and shape.

Packaging with laser welding : J. E. Jackson, SCP and Solid St. Technology, May (1966), p. 21

Photolithography has been applied to biological applications such as cell and protein micropatterning and the fabrication of microfluidic channels. However, the preparation of photomasks for projecting micropattern lighting images is often time consuming and costly. Therefore, we have developed maskless photolithography devices by modifying the optics of commercially available liquid crystal display (LCD) projectors from extended to reduced projection. The developed second and third devices produce practically a centimeter-scale micropattern by dividing an original large mask pattern into several patterns, which are individually and synchronously exposed to substrates with a motorized XY-stage, applying them to cell micropatterning and polydimethylsiloxane (PDMS) microfluidic device production. The first part of this chapter describes the developments of the maskless photolithography devices. The second part describes the exposure control system with a motorized XY-stage. The third part describes the applications of devices to cell micropatterning. The last part describes the application of the devices to the fabrication of the PDMS microfluidic channel. Maskless photolithography with an LCD projector has a large advantage with no requirement for a photomask. In particular, the maskless photolithography devices show a greater power by optimizing the conditions of pattern size and shape.