• Title/Summary/Keyword: photo sensor

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Integrated IR Photo Sensor for Display Application (디스플레이 패널에 집적이 가능한 적외선 포토센서)

  • Jeon, Ho-Sik;Heo, Yang-Wook;Lee, Jae-Pyo;Han, Sang-Youn;Bae, Byung-Seong
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.11
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    • pp.1164-1169
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    • 2012
  • This paper presents a study of an integrated infrared (IR) photo sensor for display application. We fabricated hydrogenated amorphous silicon thin film transistor (a-Si:H TFT) and hydrogenated amorphous silicon germanium thin film transistor (a-SiGe:H TFT) which were bottom gate structure. We investigated the dependence of a-SiGe:H TFT characteristics on incident wavelengths. We proposed photo sensor which responded to wavelengths of IR region. Proposed pixel circuit of photo sensor was consists of switch TFT and photo TFT, and one capacitor. We developed integrated photo sensor circuit and investigated the performance of the proposed sensor circuit according to the input wavelengths. The developed photo sensor circuit with a-SiGe:H TFT was suitable for IR.

Development of Photo-sensor for Integrated Lab-On-a-Chip (집적화된 Lab-On-a Chip을 위한 광센서의 제작 및 특성 평가)

  • 김주환;신경식;김용국;김태송;김상식;주병권
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.4
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    • pp.404-409
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    • 2004
  • We fabricated photo-sensor for fluorescence detection in LOC. LOC is high throughput screening system. Our LOC screens biochemical reaction of protein using the immunoassay, and converts biochemical reaction into electrical signal using LIF(Laser Induced Fluorescence) detection method. Protein is labeled with rhodamine intercalating dye and finger PIN photodiode is used as photo-sensor We measured fluorescence emission of rhodamine dye and analyzed tendency of fluorescence detection, according to photo-sensor size, light intensity, and rhodamine concentration. Detection current was almost linearly proportional to two parameters, intensity and concentration, and was inversely proportional to photo-sensor size. Integrated LOC consists of optical-filter deposited photo-sensor and PDMS microchannel detected 50 (pg/${mu}ell$) rhodamine. For integrated LOC including light source, we used green LED as the light source and measured emitted fluorescence.

Implementation of the Discriminating System for Surround Illuminants Using Output Voltage Ratio of Photo Sensor (광센서 출력비를 이용한 조명광 판별 시스템의 구현)

  • Kim, Eun-Su;Park, Kyung-Nam
    • Journal of the Korea Industrial Information Systems Research
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    • v.15 no.5
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    • pp.29-35
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    • 2010
  • In this paper, We implemented discriminating system for various surround illuminants using photo sensor. To discriminate surround illuminants of display device we implemented discriminating system using photo sensor which has output of Ye and Cy. Experimental results shows that we could discriminate surround illuminants by output voltage ratio (Ye/Cy) of photo sensor in the variable luminous intensity of surround illuminants.

Smart LCD using a-Si photo sensor

  • Hong, Sung-Jin;Kim, Jin-Hong;Shin, Kyung-Ju;Chai, Chong-Chul;Choi, Jung-Ye;Park, Cheol-Woo;Suk, Jun-Hyung
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.280-284
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    • 2005
  • Recently, the demands of the high quality LCD display device have increased. We have developed the smart LCD that photo sensor is integrated in. Amorphous silicon TFTs have photo leakage current characteristics when the channel of TFTs are lighted on. This characteristic has applied in our device. We expect that photo sensor integrated LCDs have lots of merits in mobile display device, note PC panel and LCD TV.

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Accuracy Analysis of Pulse Wave Sensor Data of Ear Label of Husbandry Livestock (축산 가축 이표용 맥파 센서의 데이터 정확도 분석)

  • Kim, Il-Gon;Kang, So-Hyung
    • Journal of Digital Convergence
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    • v.12 no.11
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    • pp.387-393
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    • 2014
  • In this research, we aimed to investigate the most optimum pulse wave sensor to ear label of live stocks among pulse wave piezo film sensor, conductive textile sensor, photo sensor. As a result of this research with application to 10 cattle, 10 pigs objects with pulse wave piezo film sensor, conductive textile sensor, photo sensor, photo sensor shows less standard deviation to average value than piezo film sensor or conductive textile sensor which means it is the most stable for the cattle. With pigs, piezo film sensor, conductive textile sensor and photo sensor all show stable pulse rate. Thus, to take pulse rate of livestock with curved body and long and dense coat such as cow, photo sensor will be considered as the most efficient mean.

Optimal Driving of Photo-Sensor for Control of A Mixed Environment (복합환경제어를 위한 광량 센서장치의 최적구동)

  • Kim, Jong-Man;Kim, Won-Sop;Kim, Hyung-Suk
    • Proceedings of the KIEE Conference
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    • pp.2110-2111
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    • 2011
  • Optimal Driving of Photo-Sensor for Control of a Mixed Environment was realized. The control system was carried out to investigate into the characteristics of Real time control of temperature and humidity at sprouts cutivators. Especially, for led's control for the cultivation of sprouts we have composed a Combined Automatic Control System possible for the control of temperature and humidity at the same time. The applied Photo-Sensor measurement are blue, green, red, white, yellow leds. And we had also designed the Web Programming for the automatic control about sprouts plants.

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An optical instrumentation using a sensor with a sensordummy against noises on sensor and transmission line

  • Mine, Katsutoshi;Kubota, Nobuhisa;Morimoto, Fumio;Sanada, Mizuho;Qi, Zhang
    • 제어로봇시스템학회:학술대회논문집
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    • pp.550-553
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    • 1993
  • Methods of Alternating Noise Canceling were previously developed for the optical instrumentation;one using a dual photo sensor and another using a single photo sensor that could cancel normal mode noise on a transmission line, even if the noise was of equal status noise. But the methods could not remove noise on sensor line. This paper discusses a new method of using a photo sensor with a resistance sensordummy, effectively canceling equal status normal mode noise not only on a sensor line but also on a transmission line of an optical instrumentation. The accuracy of this method has been verified by experiments using sinusoidal wave as an equal status noise on a sensor line and/or rectangular wave as an equal status wide band noise on a transmission line respectively.

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An Automatic Back-Light Brightness Control System of Mobile Display Using Built-In Photo Sensor (내장형 광센서를 이용한 모바일 디스플레이의 자동 광원 밝기 조정 시스템)

  • Ryu, Jee-Youl;Noh, Seok-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.713-716
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    • 2008
  • This paper presents an automatic back-light brightness control system for mobile displays. One of the most important factors in mobile display is the power consumption due to the limited and movable power source. More than 80% of power of the LCD display is consumed by LED bark-light unit (BLU). The target brightness also becomes higher because of its moving picture and high resolution image, so there are some side effects for not only excessive power consumption but also ergonomic inconvenience in dark environment. To prevent this discomfort and reduce power consumption, this paper proposes automatic brightness control (ABC) technique in mobile displays. Developed system contains TFT-LCD panel with built-in photo sensor, driver IC capable of controlling photo sensor, and BLU. Since the photo sensor array built in panel detects automatically outdoor ambient light intensity, the power of BLU in dark environment is reduced. Developed ABC system showed reduced power consumption of 50% in dark environment. We believe that the proposed system is very useful to control power of mobile TFT-LCD.

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The Vision-based Autonomous Guided Vehicle Using a Virtual Photo-Sensor Array (VPSA) for a Port Automation (가상 포토센서 배열을 탑재한 항만 자동화 자을 주행 차량)

  • Kim, Soo-Yong;Park, Young-Su;Kim, Sang-Woo
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.2
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    • pp.164-171
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    • 2010
  • We have studied the port-automation system which is requested by the steep increment of cost and complexity for processing the freight. This paper will introduce a new algorithm for navigating and controlling the autonomous Guided Vehicle (AGV). The camera has the optical distortion in nature and is sensitive to the external ray, the weather, and the shadow, but it is very cheap and flexible to make and construct the automation system for the port. So we tried to apply to the AGV for detecting and tracking the lane using the CCD camera. In order to make the error stable and exact, this paper proposes new concept and algorithm for obtaining the error is generated by the Virtual Photo-Sensor Array (VPSA). VPSAs are implemented by programming and very easy to use for the various autonomous systems. Because the load of the computation is light, the AGV utilizes the maximal performance of the CCD camera and enables the CPU to take multi-tasks. We experimented on the proposed algorithm using the mobile robot and confirmed the stable and exact performance for tracking the lane.

Realtime controlling for the improvement of the fluctuation ratio on the $CO_2$ laser power by a CdS Photo sensor (CdS 광센서를 활용한 $CO_2$ 레이저의 출력변동율 개선을 위한 실시간 제어)

  • Jung, Yong-Ho;Choi, Jin-Young;Chung, Hyun-Ju;Song, Gun-Ju;Kim, Whi-Young;Kang, Uk;Kim, Hee-Je
    • Proceedings of the KIEE Conference
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    • pp.1733-1735
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    • 2002
  • The important parameters deciding the fluctuation of laser beam are smoothing capacitor, frequency and the characteristics of laser resonator. In this thesis, we control the fluctuation of $CO_2$ laser in realtime by changing Duty-Ratio of IGBT and switching frequency with fixed the smoothing capacitor to improve the fluctuation of laser beam. We detect the light on laser resonator using a CdS photo sensor to improve ripple factor of laser beam and feedback fluctuated signals refined by a band pass filter into the control circuit to stabilize fluctuation actively. There is much to be desired in the realtime controlling technique of the light on laser discharge tube in electrical signal. We propose switching control technique with microprocessor and photo sensing technique by controlling switch devices optimum operation and feedback signals detected by a photo sensor into the laser power supply in order to improve ripple factor of the $CO_2$ laser beam.

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