Two-Dimensional Pixel-Level Photometric and Colorimetric Mass-Distribution Measurement of Micro-Displays

Zheng, Lili; Guo, Ziquan; Lin, Wansheng; Lei, Shuo-Di; Zhu, Lihong; Wu, Tingzhu; Guo, Weijie; Xu, Hui-Neng; Chen, Ya-Yong; Chen, Zhong; Lu, Yijun

doi:10.1109/led.2021.3064044

Cited by 9 publications

(6 citation statements)

References 12 publications

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“…Here, the advanced microscopic hyper-spectral imaging technique is adopted to test the luminescent and color performances of mini-LEDs. This method is introduced in detail in our groups' previous works [10], [11]. The experimental setup in this study mainly contains a hyperspectral imager (GaiaFieldF-2 IEEE Journal of the Electron Devices Society V10) and a metallographic microscope (MSHOT-TZTM1000).…”

Section: A Sample and Experimental Setupmentioning

confidence: 99%

Explore Luminance Attenuation and Optical Crosstalk of RGB Mini Light-Emitting Diode via Microscopic Hyperspectral Imaging

Zheng

Guo

et al. 2022

IEEE J. Electron Devices Soc.

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In this article, we experimentally and quantitatively investigate the luminance attenuation for red, green, and blue mini light-emitting diodes (LEDs), and the optical crosstalk in the RGB mini-LED array under different working currents via the microscopic hyperspectral imaging technique. The evaluation metrics of luminance attenuation for one single mini-LED subpixel and luminance influence among all three colored mini-LEDs are well defined to quantitatively describe the optical crosstalk among three mini-LED subpixels in the array. We also compare the size-dependent behaviors of luminance attenuation for blue and green mini-LEDs with an emission peak of about 465 nm and 529 nm, respectively. The minimum pixel pitch of blue and green mini-LEDs with different chip sizes is obtained through optical simulation based on LightTools software, so that the optical crosstalk can be reduced. Finally, we believe that this study could provide a useful guidance for selecting suitable working current conditions while driving the mini-LED display with suitable pixel size and pixel pitch to reduce both the optical and color crosstalk in the mini-LED display.

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Section: A Sample and Experimental Setupmentioning

confidence: 99%

Explore Luminance Attenuation and Optical Crosstalk of RGB Mini Light-Emitting Diode via Microscopic Hyperspectral Imaging

Zheng

Guo

et al. 2022

IEEE J. Electron Devices Soc.

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“…Along this line, several reviews have been published [ 15 , 16 , 17 , 18 , 19 ]. Various detection systems can provide the readout of colorimetric sensors, including simple visual color interpretations, hand-held reading devices [ 20 , 21 ], commercial spectrometers [ 22 , 23 ], custom embedded systems [ 24 , 25 ], and complementary metal-oxide semiconductor (CMOS) chips embedded in commercial cameras and smartphones [ 15 , 26 , 27 , 28 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Threshold-Responsive Colorimetric Sensing System for the Continuous Monitoring of Gases

Hota

et al. 2023

Sensors

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Colorimetric sensors are widely used because of their inherent advantages including accuracy, rapid response, ease-of-use, and low costs; however, they usually lack reusability, which precludes the continuous use of a single sensor. We have developed a threshold-responsive colorimetric system that enables repeated analyte measurements by a single colorimetric sensor. The threshold responsive algorithm automatically adjusts the sensor exposure time to the analyte and measurement frequency according to the sensor response. The system registers the colorimetric sensor signal change rate, prevents the colorimetric sensor from reaching saturation, and allows the sensor to fully regenerate before the next measurement is started. The system also addresses issues common to colorimetric sensors, including the response time and range of detection. We demonstrate the benefits and feasibility of this novel system, using colorimetric sensors for ammonia and carbon dioxide gases for continuous monitoring of up to (at least) 60 detection cycles without signs of analytical performance degradation of the sensors.

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“…The microscopic hyperspectral imaging (µ-HSI) which features 3D data integrating image and spectra (i.e. each pixel of an image contains an independent spectrum) can directly present the luminescence distribution of the optoelectronic devices [11,12], which indicate the technique of µ-HSI is very crucial for both industry and academia [13]. In this case, we used both spectrometer-based spectroradiometer and µ-HSI techniques to evaluate the properties of mini-LEDs in this study.…”

Section: Introductionmentioning

confidence: 99%

The impacts of sidewall passivation via atomic layer deposition on GaN-based flip-chip blue mini-LEDs

Lai¹,

Lin²,

Chen³

et al. 2022

J. Phys. D: Appl. Phys.

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In order to investigate the photoelectric characteristics of 80×120 µm2 Mini-LEDs with sidewall passivation by atomic layer deposition (ALD), this paper uses the techniques of spectrometer-based spectroradiometer and microscopic hyperspectral imaging. The temperature-dependent electroluminescence (TDEL) is measured using a spectrometer-based spectroradiometer. By analyzing the rising parts of external quantum efficiency at room temperature with a two-level model, the difference of physical mechanisms between Mini-LEDs with ALD and without ALD are determined. In addition, the thermal quenching indicates that the ALD sidewall passivation can enhance the temperature stability of the Mini-LEDs. The ALD sidewall passivation also enhances the light extraction efficiency according to the theoretical calculation of transmittance. Moreover, the microscopic hyperspectral imaging technique is used to evaluate different local areas of Mini-LEDs. The obtained results reveal the optimization on lateral distribution of current density within the chip after sidewall passivation.

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Two-Dimensional Pixel-Level Photometric and Colorimetric Mass-Distribution Measurement of Micro-Displays

Cited by 9 publications

References 12 publications

Explore Luminance Attenuation and Optical Crosstalk of RGB Mini Light-Emitting Diode via Microscopic Hyperspectral Imaging

Explore Luminance Attenuation and Optical Crosstalk of RGB Mini Light-Emitting Diode via Microscopic Hyperspectral Imaging

Threshold-Responsive Colorimetric Sensing System for the Continuous Monitoring of Gases

The impacts of sidewall passivation via atomic layer deposition on GaN-based flip-chip blue mini-LEDs

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