How To Make A LCD Controller Board? Step By Step Guide

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Do you know How To Make A LCD Controller Board? The LCD controller board is a piece of hardware that helps to control how LCD Monitors operate. The most common function of the LCD Controller Board is to send data from the computer to the monitor so that it can be displayed on the screen.

There are many different types of LCD controller boards, and some have more features than others, depending on how they were designed for use in a specific application. In this article, we will explore how you can make your own LCD controller board, what its functions are, and how it works with other parts of the system.

Make A LCD Controller Board

LCD Controller Board Introduction

The first LCD controller boards were used mostly in laptops and had a resolution of 640 x 480. As technology has advanced, the new LCD controller boards have been improved to work on higher resolutions with better color and depth.

A newer system of LCD controller boards is how it connects with other pieces of hardware – how the data from the CPU is transmitted to the monitor for processing and how the pixels are organized on the screen.

How To Make A LCD Controller Board?

Step One: Collect Materials: This step is fairly self-explanatory. Here is what you will need to complete the project:

  • 1x Arduino UNO
  • 1x 3.3-volt power source
  • 2x 220 ohm resistor
  • 4x jumper wires
  • 1x solderless breadboard
  • 1x LCD with an I2C backpack

Step Two: Determine how you want to connect your LCD to the board. This is dependent on how many buttons you want to use for control and how you want them to be labeled. For this tutorial, we will connect one button-up with its corresponding character using jumpers. If you plan on using a laptop keyboard, you’ll need a different setup, but the process is similar.

Step Three: Set up your circuit on the solderless breadboard. Set up your circuit like in the diagram below, making sure you use all 220-ohm resistors for each LED connection and using female-to-male jumper wires wherever necessary.

To connect two pieces of wire, it’s best practice to strip both ends with a pair of wire strippers (or scissors if that’s how you roll), twist them around each other tightly, then solder over the top before covering in electrical tape or shrink-wrap tubing.

This will ensure they stay connected properly when plugging into components later on during assembly; don’t forget this step! Make sure everything works by testing out one button at a time so you can see what the corresponding letter is set to on the LCD screen.

Step Four: Determine how you want your buttons labeled and place them accordingly on the solderless breadboard. The row of holes that are closer together should be used for all connections between components, while those further apart can be used as input/outputs (I/O) with other devices like switches or sensors.

You may need jumpers depending on how many I/Os you have in use at once, so keep some handy! Now it’s time to put all this information into practice by wiring up our button circuit, determining how we’re going to label each one, then programming our Arduino board. There are plenty of resources available online that will help you through how everything works.

How Do LCD Controller Boards Work?

LCD controller boards operate by converting the data from the micro-computer into a form that can be displayed on an LCD Monitor. When displaying one byte of information at a time, each type of controller board has its own way to convert that byte into four signals or commands to generate one complete screen’s worth of information.

There are two common types: The HD44780 and the ILI9341. These commands are sent as either 16-bit or 8-bit binary numbers with additional control codes for various functions such as cursor positioning, text positioning, refreshing the display, changing colors, and many others.

To create these multiple levels of commands from a single ASCII byte is completely hardware-specific and cannot be done by software alone. Thinking about how the controller board works and how each command is generated for one screen’s worth of information can be confusing at first. Have a look below to get an idea; they vary slightly per type, but most follow this pattern:

For example, in order to write “Hello World” on your LCD, you will need 22 bytes:

21 ASCII characters (bytes) + zero byte termination code = 21 Bytes total or 16 bits (22 – (one start bit and one stop bit))

20 control codes for positioning purposes + four display commands which make up two lines x eight columns of pixels = 40 bits/commands total or 32 bits with no extra terminating byte needed since it always has a value zero when sent via I²C communication.

And for a 16-bit controller, that is how it works! You can see how the amount of information needed to write something as simple as “Hello World” on an LCD screen can be quite large and how much memory you would need just for text alone if sending each byte individually over I²C or SPI without compression methods.

And this example was only 21 characters long; depending on how big your word processor documents are, they could quickly start using multiple screens worth of space which surely isn’t feasible with current microcontroller technology!

But there’s no reason to panic because thankfully, we have smart people working hard every day trying to figure out new ways around these problems, so someday soon, future generations will look back thinking what primitive devices we once had to deal with all this.


So, we hope this blog post has given you some insights on How To Make A LCD Controller Board? and what the benefits of building your own LCD Controller Boards are.

Frequently Asked Questions

Is there a universal LCD controller board?

Yes, the controller board is universal for any LCD display that will work with a controller board.

What is an LCD controller board used for?

The main function of the LCD controller board is to control how information gets displayed on your screen and how it reacts with other components like switches, buttons, or sensors. More complex devices can be made by adding multiple types of input and output circuits together, which we will look at in future blog posts.

How can I convert my laptop monitor to LCD?

The answer to your question is “no.” You can’t convert a monitor. In general, with LCD monitors, the backlight uses an inverter that converts Direct Current into what’s called Switched Current, which acts as a light driver. What this process does is turn on and off the electricity from the wall socket to create that backlight or glow you see in any kind of flat panel display.

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