• Title, Summary, Keyword: LCD

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A Study on the Efficient Technique of LCD Brightness Control in the Mobile System (모바일 제품의 효율적인 LCD 밝기 조절 기법에 관한 연구)

  • Kim, JongDae;Park, YoungJoon;Kim, YoungKil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.451-454
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    • 2009
  • There are a lot of multimedia functions getting included in mobile devices recently, not only simple audio but visual functions as well, such as video playing, game and web browsing. Such the visual multimedia functions brought the strong requirement for much bigger LCD Display and high resolution. And the brightness of LCD is also one of major requirements and it is required to be more bright However, LCD brightness is limited to increase because of power consumption. It occupies nearly 30% of the whole system power. This thesis suggests an effective and simple method of adjusting the LCD backlight brightness, considering a characteristic of battery and user pattern.

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Hardware Design of 240*320 TFT-LCD Controller (240*320 TFT-LCD의 컨트롤러 하드웨어 설계)

  • Sung, Kwang-Ju;Ha, Chang-Soo;Choi, Byeong-Yoon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.167-169
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    • 2010
  • This paper describes hardware design and FPGA verification of TFT-LCD controller used in mobile devices widely. TFT-LCD controller outputs pixel's color information red, green, blue and Hsync, Vsync synchronization signals. We used verilog-hdl to describe TFT-LCD controller and simulated it using modelsim software and verified it's exact operation on Xilinx FPGA. Framebuffer made up Block RAM form in FPGA and TFT-LCD displayed image file.

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Super-PVA LCD Technology for Wide Viewing Angle Performance

  • Kim, Sang-Su;Park, Jin-Hyeok;Kim, Tae-Seong
    • Information Display
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    • v.6 no.4
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    • pp.11-21
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    • 2005
  • 평판 디스플레이 장치가 LCD-TV에 사용되는 경우 시야각 특성과 동화상 성능은 보다 중요한 성능이 된다. 전반적인 LCD의 화질 특성은 시야각 특성과 동화상 응답 속도를 제외한 모든 부문에서 경쟁 기술보다 우세하다. 이러한 디스플레이의 시야각 특성을 개선하기 위해 LCD업계에서는 IPS, MVA, PVA 등 시야각 특성이 개선된 광시야각 액정 Mode를 개발하여 사용하고 있지만 여전히 LCD는 자발광 디스플레이에 비하여 측면 시인성 측면으로 열세에 있었다. 최근에는 LCD의 측면 시인성을 획기적으로 개선 할 수 있는 기술이 개발되어 더 이상 LCD-TV 응용에서 문제가 되지 않을 수준이 되고 있다. 본 논문에서는 여러가지 광시야각 액정모드 LCD의 측면 시인성 향상 기술에 대한 개략적인 사항을 알아보고, 그 중 Super PVA 액정 기술의 기본원리와 동작 방법에 대하여 상세히 기술하기로 한다.

AMBA-based LCD controller design and implementation (AMBA기반의 LCD 컨트롤러 설계)

  • Hong Jae-In;Cho Tae-Kyung
    • The Journal of the Korea Contents Association
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    • v.4 no.4
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    • pp.179-187
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    • 2004
  • In this paper, we have designed an LCD controller based on AMBA. Normally display systems using the LCD are adopted independent bus architecture for high speed data access. Proposed LCD controller complies with AMBA data format and has an image scaler that executes interpolation for full screen display. This image scaler employs FOI for horizontal scaling and H-Shape pseudomedian filter for vertical scaling. It has been designed with VHDL and verified on prototype board using Xilinx FPGA and LCD panel.

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Characteristics of a-Si:H TFTs with Silicon Oxide as Passivation Layer

  • Chae, Jung-Hun;Jung, Young-Sup;Kim, Jong-Il;Kim, Chang-Dong;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.940-943
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    • 2005
  • The characteristics of a-Si:H TFTs with silicon oxide as passivation layer were reported. It was studied that the insulating characteristics and step coverage characteristics of low temperature silicon oxide before applying to a-Si:H TFT fabrications. With the optimum deposition conditions considering electrical and deposition characteristics, low temperature silicon oxide was applied to a-Si:H TFTs. The changes in characteristics of a-Si:H TFTs were analyzed after replacing silicon nitride passivation layer with low temperature silicon oxide layer. This low temperature silicon oxide can be adapted to high resolution a-Si:H TFT LCD panels.

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New S-PVA Technology for Advanced LCD Performance

  • Um, Yoon-Sung;Park, Seung-Beom;Kim, Hoon;You, Hye-Ran;Lyu, Jae-Jin;Kim, Kyeong-Hyeon;Kim, Sang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.403-406
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    • 2007
  • A New S-PVA which is named as charge-shared super PVA (CS S-PVA) LCD mode is proposed. CS SPVA controls the voltage ratio of low pixel by sharing system between low pixel and control cap, resulting in improved off-axis image quality and transmittance increase without any side effects. Moreover, the new S-PVA LCD mode is free of image-sticking. Operating schemes and display performance of CS S-PVA are presented.

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AMLCD for TV Applications;New Challenge for LCD

  • Jun, Hyung-Souk;Kim, K.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.223-224
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    • 2000
  • As technology level of TFT-LCD advances, application to TV becomes an emerging important area for LCD makers. In this paper, we review current LCD technology level to be used in TV such as liquid crystal response behavior, color accuracy, contrast ratio, brightness and panel size. Based on the understanding of current limitations in LCD compared with CRT, the improvement plan to render 'near perfect motion picture' reproduction with LCD is proposed. Digital TV is a great opportunity for digital LCD panels, but we have to solve remaining technical and cost issue in order to be competitive with other large size TV technologies such as PDP, CRT or projection type. In preparing the upcoming digital TV era with advanced TFT-LCD, the hurdles and prospect of larger size LCD-TV panels will be discussed.

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ON LCD CODES OVER FINITE CHAIN RINGS

  • Durgun, Yilmaz
    • Bulletin of the Korean Mathematical Society
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    • v.57 no.1
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    • pp.37-50
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    • 2020
  • Linear complementary dual (LCD) codes are linear codes that intersect with their dual trivially. LCD cyclic codes have been known as reversible cyclic codes that had applications in data storage. Due to a newly discovered application in cryptography, interest in LCD codes has increased again. Although LCD codes over finite fields have been extensively studied so far, little work has been done on LCD codes over chain rings. In this paper, we are interested in structure of LCD codes over chain rings. We show that LCD codes over chain rings are free codes. We provide some necessary and sufficient conditions for an LCD code C over finite chain rings in terms of projections of linear codes. We also showed the existence of asymptotically good LCD codes over finite chain rings.

A Cost-effective 60Hz FHD LCD Using 800Mbps AiPi Technology

  • Nam, Hyoung-Sik;Oh, Kwan-Young;Kim, Seon-Ki;Kim, Nam-Deog;Kim, Sang-Soo
    • Journal of Information Display
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    • v.10 no.1
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    • pp.37-44
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    • 2009
  • AiPi technology incorporates an embedded clock and control scheme with a point-to-point bus topology, thereby having the smallest possible number of interface lines between a timing controller and column drivers. A point-to-point architecture boosts the data rate and reduces the number of interface lines, because impedance matching can be easily achieved. An embedded clock and control scheme is implemented by means of multi-level signalling, which results in a simple clock/data recovery circuitry. A 46" AiPi-based 10-bit FHD prototype requires only 20 interface lines, compared to 38 lines for mini-LVDS. The measured maximum data rate per data pair is more than 800 Mbps.