Optical feedback system with integrated color sensor on LCD

Lee, Ki‐Chan; Moon, Seong-Yong; Berkeley, Brian H.; Kim, Sang Soo

doi:10.1016/j.sna.2006.01.028

Cited by 19 publications

(11 citation statements)

References 7 publications

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“…This was due to the immediate availability of highly accumulated information in the literature in terms of the optical properties of a-Si:H-based TFTs and their understanding on device behaviors. a-Si:H has been used as conventional TFTs in the display industry, and photodetectors integrated with active matrix are conjugated as imaging scanners, optical feedback systems, or/and touch panels for interactive display operation [ 28 , 29 , 30 , 31 ]. Compared to a-Si:H TFTs, MoS 2 TFTs have demonstrated potential for both display backplane TFTs and photodetectors [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Photodetective Properties on Multilayered MoS2 Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors

et al. 2021

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Photodetectors and display backplane transistors based on molybdenum disulfide (MoS2) have been regarded as promising topics. However, most studies have focused on the improvement in the performances of the MoS2 photodetector itself or emerging applications. In this study, to suggest a better insight into the photodetector performances of MoS2 thin film transistors (TFTs), as photosensors for possible integrated system, we performed a comparative study on the photoresponse of MoS2 and hydrogenated amorphous silicon (a-Si:H) TFTs. As a result, in the various wavelengths and optical power ranges, MoS2 TFTs exhibit 2~4 orders larger photo responsivities and detectivities. The overall quantitative comparison of photoresponse in single device and inverters confirms a much better performance by the MoS2 photodetectors. Furthermore, as a strategy to improve the field effect mobility and photoresponse of the MoS2 TFTs, molecular doping via poly-L-lysine (PLL) treatment was applied to the MoS2 TFTs. Transfer and output characteristics of the MoS2 TFTs clearly show improved photocurrent generation under a wide range of illuminations (740~365 nm). These results provide useful insights for considering MoS2 as a next-generation photodetector in flat panel displays and makes it more attractive due to the fact of its potential as a high-performance photodetector enabled by a novel doping technique.

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Section: Introductionmentioning

confidence: 99%

Enhancement of Photodetective Properties on Multilayered MoS2 Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors

et al. 2021

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“…Light sensors can also be used to control the brightness of LCD monitors in order to improve the efficiency of electric power consumption and add to the comfort of the eyes. These two systems can smartly combine ambient light intensity and set point values in order to control brightness, from the lowest to the highest levels [6].…”

Section: Introductionmentioning

confidence: 99%

Using a Fuzzy Light Sensor to Improve the Efficiency of Solar Panels

et al. 2018

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Abstract. Solar panel efficiency can be increased by improving the quality of photovoltaic material, the effectiveness of electronic circuit, and the light source tracking model. This research is aimed at improving the quality of solar panels by tracking light source using a fuzzy logic sensor. A fuzzy light sensor property is obtained from two LDR (light dependent resistor) light sensors installed in parallel to each other and is given a light separator in between them. Both sensors are mounted on a solar panel. Sensor output is acquired using a 12 bit ADC from an ATSAM3XE microcontroller and is then sent to a computer using WIFI radio. A PID (Proportional-Integral-Derivative) control algorithm is used to manage the position of the solar panel in line with the input given by the fuzzy light sensor. This control mechanism works based on the margin of fuzzy membership from both sensors that is used to move a motor DC that in turn moves the solar panel. Experimental results show a characteristically symmetrical fuzzy membership of both sensors with a reflected correlation of R=0.9981 after gains from both sensors are arranged with a program. Upon being tested in the field, this system was capable of improving the performance of solar panels in gaining power compared to their original fixed position. The discrepancy was evident when the angle of incoming sunlight approached both 0 and 180. Further calculations of data acquired by the fuzzy light sensor show increased solar panel power efficiency by up to 5.6%.

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“…The interest in the study of new applications [18] and the difficulty in taking measurements, which occurs in some cases, have sparked interest in novel models to perform experiments, and to develop light control applications more accurately and at a lower cost. The applications for photodetectors are manifold, the most common are varying photometric measurements [19][20][21], applications where infrared radiation is utilized [22][23][24][25][26] and where color measurement is required [27][28][29][30][31][32][33], intelligent lighting control [19,[34][35][36], the derivation of measures such as CCT (Correlated Color Temperature) [37], the estimation of the CRI (Color Rendering Index) [38] and the determination of power measurements in more particular cases such as PAR (Photosynthetically Active Radiation) [39]. However, the response of low-cost photodetectors is not adjusted to the referred measurements and approximations or transformations are necessary, i.e.…”

Section: Introductionmentioning

confidence: 99%

Characterization Of Photodectors Using A Monochromator And A Broadband Light Source In The Xyz Color Space

Vargas-Bonilla

2016

International Journal on Smart Sensing and Intelligent Systems

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Abstract-Photodetectors are sensors, which respond to the electromagnetic radiation of the spectrum. Their spectral response depends on many factors of the manufacturing process, e.g. the type of diode that is used or, in some cases, the optical elements that are added to limit the response band. In this paper, we propose an experimental methodology to obtain the spectral response of a photodetector by constructing the characteristic curve using the monochromatic response. For this purpose, we use a broadband source as input of the monochromator to vary the wavelength each five nm. The characteristic curves of one commercial color sensor were obtained (including the loss) using the output ratio of the monochromator.Via the numerical expression of the response curve, it is possible to model the actual response of the photodetectors to known or simulated spectra of electromagnetic radiation, and thus to generalize photometric measurements. Previously we have demonstrated the importance of obtaining such measurements to study light sources. Finally, this newly developed method helps studying the behavior of a photodetector in detail; hence, it enables the derivation of photometric measurements from known data or simulations.

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Optical feedback system with integrated color sensor on LCD

Cited by 19 publications

References 7 publications

Enhancement of Photodetective Properties on Multilayered MoS2 Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors

Enhancement of Photodetective Properties on Multilayered MoS2 Thin Film Transistors via Self-Assembled Poly-L-Lysine Treatment and Their Potential Application in Optical Sensors

Using a Fuzzy Light Sensor to Improve the Efficiency of Solar Panels

Characterization Of Photodectors Using A Monochromator And A Broadband Light Source In The Xyz Color Space

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