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Make this LED Driver Circuit for Backlighting Small LCD Screens

Last Updated on June 15, 2019 by Swagatam Leave a Comment

In this post we study a LED driver circuit specially designed for backlighting LCD screens applications, Introductionlet' learn more about this interesting device.

Table of Contents
  • Introduction
  • Circuit Operation

Introduction

Today LCD products have become very common and a part of our everyday life. Whether it's your cell phone, DVD player, TV set, car, all incorporate LCD screens for indicating or displaying purposes.

warning message: electricity is dangerous, proceed with caution

The big reason of LCDs getting so popular is probably the presence of the back lighting that illuminates the entire surface of the unit brightly, making the relevant readings distinct and full of life.

LEDs are the prime components which are used for the above illumination applications. Genarally a group of high efficient LEDs are placed behind a responsive surface for getting the desired LCD effect or the back light illuminations.

For smaller color LCD units, around 8 white LEDs are usually sufficient for the required intensities. When placed uniformly, they almost present a perfectly balanced illumination of the LCD.

Circuit Operation

An effective LED driver circuit for LCD back lighting application has been discussed here which utilizes the IC ZXLD1100/1101/1937 from ZETEX.

The proposed circuit is based on the principle of PFM inductive boost converter concept.
The circuit is able to handle six series connected LEDs, powered by a Li-Ion cell and up to eight LEDs from a supply of 5 volts.

The ZETEX ICs are able to provide a good 350 mAof current for driving the above LEDs through a boost of up to 28 volts from the above discussed supply sources.

The minimum current required for keeping the IC operational is around 0.5uA, below which the IC shuts down itself.

The converter output is variable and can be varied by applying definite PWM control pulses across the enable pin out of the IC.

Depending upon the frequency of the fed PWM, the generated output is either chopped or a true continuous analogue.

LEDdrivercircuitforbacklightingsmallLCDscreens

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Filed Under: Lamps and Lights Tagged With: Backlighting, Driver, LCD, LED, Screens, Small

About Swagatam

I am an electronics engineer and doing practical hands-on work from more than 15 years now. Building real circuits, testing them and also making PCB layouts by myself. I really love doing all these things like inventing something new, designing electronics and also helping other people like hobby guys who want to make their own cool circuits at home.

And that is the main reason why I started this website homemade-circuits.com, to share different types of circuit ideas..

If you are having any kind of doubt or question related to circuits then just write down your question in the comment box below, I am like always checking, so I guarantee I will reply you for sure!

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