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Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

Impedance Combination

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Consider a string of christmas lights, each bulb symbolizing an impedance element. In this series configuration, the flow of electric current remains uniform across every component. This behavior aligns with Kirchhoff's Voltage Law (KVL), which asserts that the total impedance in such a setup equals the sum of individual impedances—akin to resistors in series. It follows that the voltage from the power source is distributed proportionally among these components, adhering to the voltage division...

Modeling of Diode Reverse Characteristics

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In electronic circuits, reverse-biased diode configurations are critical for regulating voltage levels. Zener diodes exploit the reverse breakdown phenomenon and exhibit a controlled breakdown at a specific Zener voltage (VZ). They are designed to maintain a constant voltage across their terminals and are commonly used for voltage regulation in circuits.
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Diode: Reverse bias

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A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...

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Related Experiment Video

Updated: May 31, 2026

In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography (CT) and Light Microscopy (LM) Correlated with Scanning Electron Microscopy (SEM)

In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography (CT) and Light Microscopy (LM) Correlated with Scanning Electron Microscopy (SEM)

Published on: June 16, 2016

New reversing design method for LED uniform illumination.

Kai Wang¹, Dan Wu, Zong Qin

¹Division of MOEMS, Wuhan National Laboratory for Optoelectronics, College of Optoelectronics Science and Engineering, Huazhong University of Science & Technology, Wuhan 430074, China.

|July 13, 2011

Summary

This study introduces a novel reversing design method for optimizing light intensity distribution curves (LIDCs) in light-emitting diode (LED) applications. The method achieves superior uniform illumination with fewer LED modules, especially for slim backlighting designs.

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Area of Science:

Optics and Photonics
Illumination Engineering

Background:

Optimizing light intensity distribution curves (LIDCs) for uniform illumination in light-emitting diode (LED) applications is a significant challenge, particularly with varying distance-height ratios (DHRs).
Existing methods often struggle to achieve high uniformity efficiently, especially in space-constrained designs like slim backlighting.

Purpose of the Study:

To propose and validate a new reversing design method for optimizing LIDCs and designing freeform lenses for uniform LED illumination.
To demonstrate the effectiveness of this method in achieving high illuminance uniformity and reducing component count in slim direct-lit LED backlighting.

Main Methods:

Development of a reversing design methodology for LIDC optimization.
Implementation of a novel algorithm for designing freeform lenses to generate the required LIDC from LED light sources.
Integration of freeform lenses into new LED modules for slim backlighting applications.

Main Results:

Achieved significant increases in illuminance uniformity, from 0.446 to 0.915 (DHR=2) and 0.155 to 0.887 (DHR=3), using the new LED modules.
Reduced the number of LED modules required by a factor of 9 compared to traditional designs while maintaining similar uniform illumination.
Successfully designed 10mm thick slim direct-lit LED backlighting modules.

Conclusions:

The proposed reversing design method offers a practical and simple approach for optical design of uniform LED illumination, especially for large DHRs.
This method enables the creation of highly uniform and efficient LED lighting solutions with reduced form factors and component counts.
The findings are particularly relevant for advanced display technologies and energy-efficient lighting systems.