• 대한인간공학회지
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• 제26권4호
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• pp.33-39
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• 2007

In the full white pattern, white uniformity means the degree of uniform distribution of white color and luminance across the whole screen. Among the FPDs(Flat Panel Displays), the TFT-LCD has weak point of viewing angle. The viewing angle considering location and direction can cause different image quality of the TFT-LCD. Therefore, white uniformity of the TFT-LCD must consider viewing angle. Based on international standards, this study proposes an alternative that is realistic and ergonomic measurement of white uniformity of the TFT-LCD.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.598-600
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• 2002

To improve the luminance and efficiency of AC PDP, the effects of a square pulse applied to the address electrode during a sustain-period is investigated. Through this experiment, we confirmed the improvement of luminance and efficiency. We performed the temporal behavior measurement for the light emitted from AC PDP at floating state of the address electrode and at various auxiliary voltages (including ground state) applied to the address electrode using the scanned point detecting system. In the case of using an auxiliary voltage pulse, emission starts at the inner edges of the anode and cathode simultaneously. Also, we obtained the larger two discharge volumes compared with the normal sustain discharge where address electrode is floated.

• 반도체디스플레이기술학회지
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• 제8권1호
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• pp.27-31
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• 2009

A characteristic of new waveform, called a negative waveform, was studied during reset and address periods. IR distribution, black luminance and time delay were measured to compare the negative waveform with the conventional positive waveform. Based on the analysis of IR measurement, the negative waveform could accumulate more wall charges than the positive waveform. Also the black luminance of negative waveform was lower than that of positive waveform under the same bias and ramp-slope conditions. During address period, the discharge time lag was measured. The negative waveform was showed 0.25 us faster formative time lag and 0.1 us faster average time lag than those of positive waveform.

• 조명전기설비학회논문지
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• 제20권4호
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• pp.1-6
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• 2006

터널은 밝기가 급변하는 장소로서 자동차 운전자가 터널 진입 시 도로의 상황이나 교통상황을 정확히 파악하여 안전하고 불안감 없이 도로를 통행할 수 있도록 조명설비가 관리되어야 한다. 터널내의 충분한 밝기 유지를 위하여 터널내부의 조도를 정기적으로 측정하여야 하는데 기존의 수동식 측정법으로는 신속하고 신뢰성 높은 조도측정에 한계가 있다. 따라서 본 논문에서는 차량을 이용한 터널조도 및 휘도 측정시스템을 개발하고 그 운용타당성에 대한 결론을 도출하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.1
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• pp.220-223
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• 2004

Inductively coupled plasma is commonly used for electrodeless lamp due to its ease of plasma generation. Optical characteristics significantly depend on the RF power and gas pressure of the plasma. This paper describes the measurement of luminance as a function of RF power and gas pressure with a goal of finding optimal operating conditions of the electrodeless lamp. The gas pressure was varied from 10[mTorr] to 300[mTorr] or 500[mTorr] and the RF power was varied from 10[W] to 200[W]. It was found that the luminance tends to be decreased when argon and neon pressure is increased, and the luminance is increased as RF power is increased. It was also found that the luminance per unit RF power is high when the argon and neon pressure is low and when the RF power is in the range of $30[W]{\sim}40[W]$ or 10[W].

• 한국전기전자재료학회논문지
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• 제37권3호
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• pp.314-321
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• 2024

Low road lighting is a lighting device that complements the shortcomings of existing pillar-type street lights. It is a lighting device that emits light from the side of the road surface and adjusts the luminance of the road surface like a light carpet. In this paper, to achieve full commercialization, we analyzed the luminance of the installed road surface and studied whether lighting could replace existing road lighting. In this study, the LMK (Luminance Measurement Camera) LABSOFT program was used to measure and analyze the surface luminance of road lighting, and the RELUX program was used to evaluate and analyze the simulation performance to determine light-based lighting conditions. A study was conducted to determine whether replacing pillar-type road lighting with low-level road lighting in a real environment would ensure comfortable and safe night vision for drivers at night.

• 한국자기학회지
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• 제26권5호
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• pp.168-172
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• 2016

MRI 검사실의 최적환경을 목적으로 검사실 및 모니터의 휘도와 조도를 측정하였다. 대학병원(n = 6)의 MRI(n = 10)에서 휘도와 조도를 Unfors Xi Light Probe(Unfors Instruments AB, Billdal, Sweden)를 이용하여 측정하였다. 휘도는 black level과 white level을 조도는 모니터의 측면의 중앙에서 3회 반복하여 평균과 표준편차를 구하여 t-test를 이용하여 유의성 검정의 통계적 처리를 하였다. 모니터 휘도는 black level에서 평균 $1.78cd/m^2$, 표준편차 $0.85cd/m^2$이었고, white level에서는 평균 $43.58cd/m^2$, 표준편차 $13.19cd/m^2$로 측정되었다. MRI 검사실 조도는 최저값 30.5 lux, 최대값 601.3 lux, 평균 177.86 lux로 측정되었고, 휘도와 조도는 통계학적으로 유의한 차이가 있다(p < .05). MRI 모니터 및 검사실 휘도와 조도의 권고 기준을 참고하여 최적인 환경을 조성하도록 한다.

• 한국재난정보학회 논문집
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• 제18권4호
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• pp.806-816
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• 2022

연구목적:본 연구에서는 지하공동구 내 실시간 탈출 유도를 위한 비주얼 시그널 표출 광색에 대하여 연기발생 상태의 휘도측정 분석 결과에 대하여 고찰하고자 한다. 연구방법: 대기 중의 빛의 산란 특성 및 시인성 이론에 근거한 광학적 기술을 분석하고 탈출 유도를 위한 비주얼 시그널 표출 장치 시작품을 통하여 유도기능으로서의 요소기술을 분류하고자 한다. 연구결과: 연기 발생 조건 상태에서 수행한 실험에서 적색, 녹색, 황색 순으로 휘도비가 낮고 가시성이 좋은 것으로 결과가 도출되었다. 단, 본 결과는 연색성이 고려되는 일반 조명과는 다른 결과로 신호용, 감지용 등의 시그널에 국한된다. 결론: 신호용, 감지용 비주얼 시그널의 표출 광색에 대한 연기 발생 이벤트 상황에서의 휘도 측정 결과와 선행 연구에서 실시된 선호도 조사 결과를 모두 반영하여 결론을 도출하였다. 연기발생 이벤트 발생 시 적색 또는 녹색의 광색으로 탈출 유도 비주얼 시그널을 적용하는 것이 좋을 것으로 판단된다.

• 한국정밀공학회지
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• 제23권4호
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• pp.91-98
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• 2006

A light guide panel (LGP) is an element of the LCD back light unit, which is used for display devices. In this study, the laser marking process is applied to the fabrication of light guide panels as the new fabrication process. In order to obtain a light guide panel which has high luminance and uniformity, four principal parameters such as power, scanning speed, ratio of line gap, and number of line were selected. A Web-based design tool was developed to generate patterns of light guide panel at any location, and the tool may assist the designer to develop optimized patterns. Topcon-BM7 was used for luminance measurement of each specimen with $100mm{\times}100mm$ area. By Taguchi method optimized levels of each parameters were found, and luminance of $3523cd/cm^2$ and uniformity of 92% were achieved using the laser machined BLU.

• 소성∙가공
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• 제17권5호
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• pp.322-327
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• 2008

LGP is a key component of LCD back light unit because it determines brightness and sharpness of the display image. Usually, it has optical patterns fabricated on the bottom surface. These optical patterns convert point or line sources placed in the side of LGP to plane source at the top surface by changing the propagating direction of the incident light. In the present paper the LiGA-reflow method was applied to fabricate the LGP mold. Furthermore, the optical simulation considering the replication ratio of pattern height was applied to the pattern design. The optical simulation through systematic correction scheme was adopted to find the optimum distribution of pattern density. Finally, the stamper fabricated by this method was installed in the mold and LGP was produced by injection molding. As a result of luminance measurement for the final product, the average luminance and luminance uniformity was measured 3,180 nit and 84%, respectively. Consequently, the mold fabrication method using the LiGA-reflow and optical simulation(CAE) can save the expense and time compared with the existing fabrication methods(laser ablation and chemical etching).