A light-emitting diode (LED) is a semiconductor light source that emits light when current flows through it. Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. The color of the light (corresponding to the energy of the photons) is determined by the energy required for electrons to cross the band gap of the semiconductor. White light is obtained by using multiple semiconductors or a layer of light-emitting phosphor on the semiconductor device. 

In an organic light-emitting diode (OLED), the electroluminescent material composing the emissive layer of the diode is an organic compound. The organic material is electrically conductive due to the delocalization of pi electrons caused by conjugation over all or part of the molecule, and the material therefore functions as an organic semiconductor. The organic materials can be small organic molecules in a crystalline phase, or polymers. 

An OLED display works without a backlight because it emits visible light. Thus, it can display deep black levels and can be thinner and lighter than a liquid crystal display (LCD). In low ambient light conditions (such as a dark room), an OLED screen can achieve a higher contrast ratio than an LCD, regardless of whether the LCD uses cold cathode fluorescent lamps or an LED backlight.

Manufacturers have developed in-cell touch panels, integrating the production of capacitive sensor arrays in the AMOLED module fabrication process. In-cell sensor AMOLED fabricators include AU Optronics and Samsung. Researchers at DuPont used computational fluid dynamics (CFD) software to optimize coating processes for a new solution-coated AMOLED display technology that is competitive in cost and performance with existing chemical vapor deposition (CVD) technology. 

In today’s world where Virtual is the new Real, let your display take you to wonderful, ethereal places. 


Arduino based smart traffic control system

In this project we are constructing a density based traffic light controller using Arduino Mega 2560. The main purpose of this project is, if there will be no traffic on the other signal, one shouldn’t wait for that signal. The system will skip that signal and will move on the next one. This distance will tell us if any vehicle is near the signal or not and according to that the traffic signals will be controlled. As a result, the duration and relative phases of each traffic light cycle change dynamically.


[1] Breadboard: To provide the base for various connections and components.

[2] Arduino Mega 2560: For distribution and management of current through various components based on the given input.

[3] Jumper Cables: For interconnection of various components of the circuit.

[4] 220Ω resistors: To control the current through the circuit and protect the circuit from damage due to over voltage.

[5] LED: To show the various types of input or the position of hand where sensor is touched.

[6] HC-SR04 Ultrasonic sensors: It useful for accurate distance measurement of the target objects and mainly works on the sound waves.


If there is traffic at all the signal, then the system will work normally by controlling the signals one by one. If there is no traffic near a signal, then the system will skip this signal and will move on to the next one. For example, if there is no vehicle at signal 2, 3 and currently the system is allowing vehicles at signal 1 to pass. Then after signal 1, the system will move on to signal 4 skipping signal 2 and 3. If there is no traffic at all the 4 signals, system will stop at the current signal and will only move on the next signal if there will be traffic at any other signal.




It’s been more than 4 months since we left college. Back in March, we thought that this might end soon and it is just our pre-summer summer vacation. Guess we were wrong. Very wrong.

We’ve all heard life is unpredictable and what better than a pandemic to teach us that. Never in a million years had I thought I’d be spending the last year of college like this, sitting at home instead of my hostel room, eating good food instead of the weekly 5 variations of uthappam and mix veg, talking to my friends on zoom instead of going to their room or hanging out in foodies(then going somewhere else because you can’t really hear people in foodies) and attending classes on my phone while sleeping instead of using my phone and sleeping in the classroom. Like everyone, even I had several plans for this year. This was the year we were supposed to get our farewell. This was the year I had planned to go to Goa with my friends (like every other year). But now, this is the year I hope to just meet my friends and attend classes with them for one last time. From dreaming of Goa to settling for TT, that’s how unpredictable life is guys. Since you’ll still have plenty of time after all this is over (hopefully) make the most of it, learn, grow, have fun, go out with your friends even if it means walking from SJT to main gate, click a ton of pictures because in the end these memories are what you’re going to take away with you. Also, probably a job but memories for sure. Yes, I know it is a cliché but it is also very true. Take care and stay safe.

VIT, Vellore

Instrument society of India

Vellore institute of technology, vellore

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