A Monolithic Micromachined Thermocouple Probe With Electroplating Nickel for Micro-LED Inspection

Shih, Fuchi; Tsou, Chingfu; Fang, Weileun

doi:10.1109/jmems.2021.3112769

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…Although the authors contended that the surface of a 200 µm diameter thermocouple experiences minimal influence from incident or reflected light, they did not address the potential effects of light blocking on the LEDs themselves. Similarly, Shih et al [52] utilized micromechanical monolithic thermocouples with probe sizes of 78 µm and 118 µm to perform electrical and thermal measurements on micro LEDs. Mechanical tests confirmed that the probe tip could make accurate contact with the miniature LED electrodes with low contact force, thus effectively determining the thermal and electrical characteristics.…”

Section: Micro-thermocouple Methodsmentioning

confidence: 99%

LED Junction Temperature Measurement: From Steady State to Transient State

Zhao,

Gong,

Zhu

et al. 2024

Sensors

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In this review, we meticulously analyze and consolidate various techniques used for measuring the junction temperature of light-emitting diodes (LEDs) by examining recent advancements in the field as reported in the literature. We initiate our exploration by delineating the evolution of LED technology and underscore the criticality of junction temperature detection. Subsequently, we delve into two key facets of LED junction temperature assessment: steady-state and transient measurements. Beginning with an examination of innovations in steady-state junction temperature detection, we cover a spectrum of approaches ranging from traditional one-dimensional methods to more advanced three-dimensional techniques. These include micro-thermocouple, liquid crystal thermography (LCT), temperature sensitive optical parameters (TSOPs), and infrared (IR) thermography methods. We provide a comprehensive summary of the contributions made by researchers in this domain, while also elucidating the merits and demerits of each method. Transitioning to transient detection, we offer a detailed overview of various techniques such as the improved T3ster method, an enhanced one-dimensional continuous rectangular wave method (CRWM), and thermal reflection imaging. Additionally, we introduce novel methods leveraging high-speed camera technology and reflected light intensity (h-SCRLI), as well as micro high-speed transient imaging based on reflected light (μ_HSTI). Finally, we provide a critical appraisal of the advantages and limitations inherent in several transient detection methods and offer prognostications on future developments in this burgeoning field.

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Section: Micro-thermocouple Methodsmentioning

confidence: 99%

LED Junction Temperature Measurement: From Steady State to Transient State

Zhao,

Gong,

Zhu

et al. 2024

Sensors

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show abstract

“…Shih et al [ 228 ] micromachined monolithic thermocouples with 78 and 118 μm probe sizes for electrical and thermal inspection of micro-LEDs. Mechanical tests verified that the probe tips could exactly contact the micro-LED electrodes with low contact forces, and, consequently, thermal and electrical properties were successfully determined.…”

Section: Other Approachesmentioning

confidence: 99%

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

2022

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In the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to other lighting systems, LEDs operate at low temperatures while junction temperature (Tj) is is among the main factors dictating their lifespan, reliability, and performance. This indicates that accurate measurement of LED temperature is of great importance to better understand the thermal effects over a system and improve performance. Over the years, various Tj measurement techniques have been developed, and existing methods have been improved in many ways with technological and scientific advancements. Correspondingly, in order to address the governing phenomena, benefits, drawbacks, possibilities, and applications, a wide range of measurement techniques and systems are covered. This paper comprises a large number of published studies on junction temperature measurement approaches for LEDs, and a summary of the experimental parameters employed in the literature are given as a reference. In addition, some of the corrections noted in non-ideal thermal calibration processes are discussed and presented. Finally, a comparison between methods will provide the readers a better insight into the topic and direction for future research.

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“…Thermocouples are employed to determine the temperature at specific points, such as hot spots in boilers, ovens, furnaces, and other heat sources. At higher temperatures, thermocouples can only be used two or three times before they fail, necessitating periodic thermocouple replacement due to their breakage [7,8]. Hence, it is necessary to turn off the entire unit in order to replace a thermocouple within a furnace or boiler.…”

Section: Introductionmentioning

confidence: 99%

Guided Co-operative Waderhunt Neural Network for Measuring the Temperature of Visible Heat Source

2023

IJIES

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In this article, a novel optimization-assisted deep learning (OptiA-DL) strategy is proposed to effectively measure the temperature of visible heat sources. Initially, the image is acquired from the heat source and filtered using gelatin paper. The guided co-operative trilateral filter (GCTF) is used for image smoothening and HSV (Hue, Saturation, Value) or RGB (Red, Green, Blue) structure for colour transformation. Then, an improved Gaussian mixture model (IG-MM) is applied to segment the image into various portions. Accordingly, the compact split attention-based convolutional waderhunt autoencoder network (CSAtt-CWAN) is used for temperature prediction. In CSAtt-CWAN, the parameters are tuned using the waderhunt optimization algorithm (WHOA). The proposed OptiA-DL strategy is implemented in the Python platform through the candle flame dataset and assessed the performance in terms of different evaluation measures. Moreover, a proposed OptiA-DL's performance is compared with existing methods to determine its efficiency in temperature measurement. The minimum mean square error (MSE) value obtained by the proposed OptiA-DL strategy is 0.076, which is lower than the existing methods for measuring the temperature of the visible heat source.

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A Monolithic Micromachined Thermocouple Probe With Electroplating Nickel for Micro-LED Inspection

Cited by 5 publications

References 36 publications

LED Junction Temperature Measurement: From Steady State to Transient State

LED Junction Temperature Measurement: From Steady State to Transient State

A Critical Review on the Junction Temperature Measurement of Light Emitting Diodes

Guided Co-operative Waderhunt Neural Network for Measuring the Temperature of Visible Heat Source

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