• Title/Summary/Keyword: liquid-crystal-display (LCD)

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The Edge-Based Motion Vector Processing Based on Variable Weighted Vector Median Filter (에지 기반 가변 가중치 벡터 중앙값 필터를 이용한 움직임 벡터 처리)

  • Park, Ju-Hyun;Kim, Young-Chul;Hong, Sung-Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.11C
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    • pp.940-947
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    • 2010
  • Motion Compensated Frame Interpolation(MCFI) has been used to reduce motion jerkiness for dynamic scenes and motion blurriness for LCD-panel display as post processing for high quality display. However, MCFI that directly uses the motion information often suffers from annoying artifacts such as blockiness, ghost effects, and deformed structures. So in this paper, we propose a novel edge-based adaptively weighted vector median filter as post-processing. At first, the proposed method generates an edge direction map through a sobel mask and a weighted maximum frequent filter. And then, outlier MVs are removed by average of angle difference and replaced by a median MV of $3{\times}3$ window. Finally, weighted vector median filter adjusts the weighting values based on edge direction derived from spatial coherence between the edge direction continuity and motion vector. The results show that the performance of PSNR and SSIM are higher up to 0.5 ~ 1 dB and 0.4 ~ 0.8 %, respectively.

A study on the Molding Stability of Hydro-mechanical High Speed Injection Molding for Thin-Walled(0.3mm) LGP (초박형(0.3t) 도광판 적용을 위한 유압식 고속사출성형의 성형 안정성 연구)

  • Kim, J.S.;Oh, J.G.;Jeong, C.;An, H.J.;Hwang, C.J.;Kim, J.D.;Yoon, K.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.422-425
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    • 2008
  • Recently, electronic products and related parts are required to have thin thickness because of small form factor. To go with the trend, LGP(light guide plate) of LCD BLU(Liquid Crystal Display Back light unit: It is one of kernel parts of LCD) for cell phone has the thickness of 0.3 mm and the battery case of cell phone has 0.25 mm. Accordingly, high speed injection molding is required to make products which have thin thickness. High speed injection molding means that the resin is injected into the cavity at higher than normal speed avoiding short shot. In the case of hydro-mechanical high speed injection machine, it requires the design for hydraulic unit to make high injection speed and the design for control unit to control hydraulic unit. In the present paper, we concentrated on the molding stability of hydro-mechanical high speed injection machine to make an LGP of 0.3 mm thickness.

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Flat Fluorescent Lamp(FFL) and Analysis of Optical Efficiency of FFL Lighting (면광원 램프 및 이를 이용한 조명 기기의 효율 특성 연구)

  • Park, Jong-Lee;Lim, Sung-Kyoo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.7
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    • pp.6-12
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    • 2007
  • A flat fluorescent lamp (FFL) developed as a light source for LCD TV backlight was used as a light source for general lighting application and its electro-optical characteristics were measured and evaluated. The channels of FFL were formed from a flat glass at high temperature by using a mold. The performance of FFL with lighting future was shown to improve by optimizing the channel profile of FFL. In this paper, the brightness efficiency of FFL with lighting fixture was evaluated and compared with that of the hot cathode fluorescent lamp (HCFL), the major light source for general lighting. The optical efficiency of FFL with future was shown to be 72.7[1m/W].

An Effective Medical Image System using TFT-DXD Method's Digital X-ray Detector (TFT-DXD 방식의 디지털 X-ray Detector를 이용한 고효율 의료 영상처리시스템)

  • Hwang, Jae-Suk;Lee, Jae-Kyun;Lee, Chae-Wook
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.32 no.4C
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    • pp.389-395
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    • 2007
  • The Film X-ray and the CCD method of current medical image system have the disadvantages such as required large place and diagnosis time. In this paper, we implement an effective medical image system using TXT-DXD method's digital X-ray detector(DR1000C). The implemented medical image system has advantages of placing efficiency and short diagnosis time. In order to make the image out of the system more effective, we develop an LCD(Liquid Crystal Display) control driver, having the resolution of 1900*1200. And we propose an enhancement unsharp masking method to update image enhancement of DR1000C medical image system, and compare it with the current methods.

A basic study on the development of intelligent tower crane using IT (멀티미디어와 RFID 등 IT를 활용한 지능형 타워크레인 개발 기초연구)

  • Han Yong-Woo;Cho Hun-Hee;Lee You Seop;Kang Tai Kyung;Kim Jong Sum
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2004.11a
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    • pp.625-628
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    • 2004
  • Even though the tower crane is a major equipment in a construction of high rise buildings, there are lack of studies of it. This study is presenting a framework of developing a intelligent tower crane applied with the technology of machine-vision, RFID(Radio Frequency Identification), or GPS(Global positioning System) and proposing the prototype of machine-vision module, sub module of this Framework. Through monitoring form CCTV(Closed Circuit Television) and LCD(Liquid Crystal Display) in machine-module the real time communication between in-site workers and crane operator is possible. this will improve the productivity and safety of the tower crane.

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Design of Alignment Mark Stamper Module for LED Post-Processing

  • Hwang, Donghyun;Sohn, Young W.;Seol, Tae-ho;Jeon, YongHo;Lee, Moon G.
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.2
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    • pp.155-159
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    • 2015
  • Light emitting devices (LEDs) are widely used in the liquid crystal display (LCD) industry, especially for LCD back light units. Therefore, much research has been performed to minimize manufacturing costs. However, the current process does not process LED chips from broken substrates even though the substrate is expensive sapphire wafer. This is because the broken substrates lose their alignment marks. After pre-processing, LED dies are glued onto blue tape to continue post-processing. If auxiliary alignment marks are stamped on the blue tape, post-processing can be performed using some of the LED dies from broken substrates. In this paper, a novel stamper module that can stamp the alignment mark on the blue tape is proposed, designed, and fabricated. In testing, the stamper was reliable even after a few hundred stamps. The module can position the stamp and apply the pattern effectively. By using this module, the LED industry can reduce manufacturing costs.

Design of the Half-bridge inverter for driving CCFL using manufactured PAN-PZT piezoelectric transformer (PAN-PZT 압전변압기 제작과 CCFL 구동용 하프브리지 인버터 설계)

  • Han, Jae-Hyun;Lim, Young-Cheol;Yang, Seung-Hak;Kweon, Gie-Hyoun
    • Proceedings of the KIEE Conference
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    • 2002.11d
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    • pp.194-196
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    • 2002
  • 액정표시장치(LCD; Liquid Crystal Display)는 표현된 정보를 가시화하기 위해 램프의 백라이트가 필수적인데 대부분 부피가 작고 효율과 휘도특성이 좋은 냉음극 방전램프가 사용된다. 램프는 고압으로 구동되며 높은 전압을 얻기 위해 일반적으로 권선 변압기를 사용한다. 그러나 권선 변압기의 경우 자체의 철심이나 권선의 손실로 인하여 출력 효율의 한계가 있으며, 고압을 위해 감긴 코일은 부피를 크게 하며 무겁게 만든다 이를 해결하기 위해 변압기 자체 손실을 줄이고 소형화가 가능하며 높은 승압비을 가진 PAN-PZT계의 적층형 압전 변압기를 제작하였다. 또한 회로의 손실을 줄이기 위한 영전압 스위칭(ZVS; Zero Voltage Switching)과 그리고 LCD패널과 인버터의 불필요한 간섭현상(EMI; Electro-Magnetic Interference)을 줄일 수 있으며 소형화가 가능한 하프 브리지형 압전 인버터를 설계하였다.

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A Study on the Surface Characteristics of Injection Mold and Injection Molded Part depending on LGP-Mold Fabrication Methods (도광판 금형의 제작 방법에 따른 사출금형 및 성형품의 표면특성에 관한 연구)

  • Do, Y.S.;Kim, J.S.;Ko, Y.B.;Kim, J.D.;Yoon, K.H.;Hwang, C.J.
    • Transactions of Materials Processing
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    • v.16 no.8
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    • pp.596-602
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    • 2007
  • LGP (Light Guiding Plate) of LCD-BLU (Liquid Crystal Display - Back Light Unit) is one of the major components that affect the product quality of LCD. The optical patterns of LGP(2.2") molds are fabricated by three different methods, namely, (1) laser ablation, (2) chemical etching and (3) LiGA-reflow, respectively. The characteristics of surface patterns and roughnesses of molds and injection molded parts were compared to evaluate the optical characteristics. The optical patterns of injection molded LGP with mold fabricated by LiGA - reflow method showed the best geometric structure. The surface roughness (Ra) of LGP#s with molds fabricated by (1) laser ablation: $Ra={\sim}31nm$, (2) chemical etching: $Ra={\sim}22nm$, and (3) LiGA-reflow: $Ra={\sim}4nm$.

Molding Stability of Hydro-Mechanical High Speed Injection Molding for Thin-Wall(0.3mm) LGP (박판(0.3mm) 도광판 성형을 위한 유압식 고속사출성형의 성형 안정성 연구)

  • Hwang, C.J.;Kim, J.S.;Oh, J.G.;Jeong, C.;An, H.J.;Heo, Y.M.;Kim, J.D.;Yoon, K.H.
    • Transactions of Materials Processing
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    • v.17 no.8
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    • pp.657-661
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    • 2008
  • Recently, products of electronic industry and related parts are required to have the thickness thinner and thinner to reduce the part weight. To go with this trend, LGP(light guide plate) of LCD-BLU(Liquid Crystal Display-Back Light Unit: It is one of kernel parts of LCD) for cell phone has the thickness of ${\sim}0.3mm$ and the battery case of cell phone has ${\sim}0.25mm$. Accordingly, high speed injection molding is required to mold products which have thinner parts. To achieve high speed injection and proper control of hydraulic unit, various design was applied to conventional injection unit. In the present paper, we concentrated on the molding stability of hydro-mechanical high speed injection machine to make an LGP of 0.3mm thickness.

Surface Effects on the Optical Performance of Liquid Crystal Displays

  • Youn, Hyung-Jin;Lee, Cheol-Soo;Jung, Moo-Sung;Kim, Dae-Woo;Yoon, Suk-In;Yoon, Sang-Ho;Won, Tae-Young
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.515-518
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    • 2005
  • In this paper, we report on our theoretical study on the effect of surface anchoring. Molecular dynamics as well as optical characteristics of PVA cell are computer-simulated with 3D-FEM numerical solver, TechWiz $LCD^{(R)}$. Although simulation parameters are the same except for the consideration of surface anchoring, the simulation reveals that optical transmittance is improved by more than 8% for the weak anchoring case with comparison to the strong anchoring case. Moreover, capacitance between pixel and common electrode is 7% lower for the strong anchoring than that for the weak anchoring. This implies that there exists an appreciable difference between the strong anchoring case and the weak anchoring case. It is very important to take the effect of surface anchoring into account in order to figure out the optical characteristics of an LCD cell more accurately.

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