What is an LED matrix?

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What is an LED matrix?

Post by Admin on Tue Sep 12, 2017 3:00 am






We often see signs like the one above in the streets or even in establishments that we go to like stores, restaurants etc. But have you ever wondered how they work? Well I guess not until you've known this subject Smile


So signs like the one above are examples of displays that use light emitting diode or LED matrix.




What is an LED matrix?


LED matrix is a collection of LEDs arranged in matrix pattern. A matrix defines a rectangular or square consisting of rows and columns. The intersection of these rows and columns are important to how we talk to the matrix and address individual LEDs.




Structure of LED Matrix

In a matrix format LEDs are arranged in rows and columns. You can also think of them as y and x coordinates. Lets assume we have 4x4 matrix. Rows would be marked from A to D and columns from 1 to 4. Now we can address each LED by row and column. Top left led would be (A,1). Bottom down led would be (D,4).

LED matrices come in two arrangements. Common-row anode (left) and common-row cathode (right).




Figure above shows the different configurations. The difference between these two configurations determine how you would call on a specific LED. With common-row anode (left), the current sources (positive voltage) are attached to rows A – D. Currents sinks (negative voltage, ground) are attached to columns 1 – 4.


Conversely, with common-row cathode (right) the current sinks (negative voltage, ground) are attached to rows A – D and currents sources (positive voltage) runs through columns 1 – 4.



Applying this knowledge, to light the top-right LED (A,4) in a common-row cathode matrix you would feed positive voltage to column 4 and connect row A to ground.


That's what an LED matrix is and how it works.

Now, what does this technique/process
for controlling many components wired together in a matrix/array called? The person who answers first will receive a thank you point.


Last edited by Admin on Mon Sep 18, 2017 4:04 am; edited 2 times in total
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Re: What is an LED matrix?

Post by pandagrrrr on Fri Sep 15, 2017 7:50 am

it is called multiplexing

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Re: What is an LED matrix?

Post by ndreanicoke on Fri Sep 15, 2017 8:24 am

What's inverse multiplexing and how does it differs from MUX and DEMUX?

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Re: What is an LED matrix?

Post by Jennielym on Fri Sep 15, 2017 8:33 am

it is possible to drive an LED matrix without a resistor?
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Re: What is an LED matrix?

Post by Admin on Fri Sep 15, 2017 9:29 pm

pandagrrrr wrote:it is called multiplexing
Yes, it is called multiplexing. Thank you for answering Smile
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Re: What is an LED matrix?

Post by Admin on Fri Sep 15, 2017 9:35 pm

ndreanicoke wrote:What's inverse multiplexing and how does it differs from MUX and DEMUX?
Basically inverse multiplexing is the opposite of multiplexing. While multiplexing is the combination of multiple low-speed links into one high-speed link, inverse multiplexing is dividing one high-speed link into multiple low-speed links.
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Re: What is an LED matrix?

Post by Admin on Fri Sep 15, 2017 9:39 pm

Jennielym wrote:it is possible to drive an LED matrix without a resistor?
Well yes, it is possible but the LEDs might be damaged in doing so.
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Re: What is an LED matrix?

Post by Jo-Ann Pretty on Mon Sep 18, 2017 8:51 am

what if I am going to connect the matrix to push button? Where should I place the connection?

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Re: What is an LED matrix?

Post by Jedjed on Sun Sep 24, 2017 10:21 pm

Jo-Ann Pretty wrote:what if I am going to connect the matrix to  push button? Where should I place the connection?

As I learned how to turn on a LED using a push button.. lol here. First, a foot of a push button should be connected to the positiv side of the breadboard. Then, the positive side of the matrix should also be connected to the other foot of the push button. Last, the negative side of the matrix should be connected to the ground. On the other hand, we are not sure which LEDs will be turned on. Lol

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Re: What is an LED matrix?

Post by herbuela on Mon Sep 25, 2017 8:52 pm

Jennielym wrote:it is possible to drive an LED matrix without a resistor?
yes, but your LEDmatrix might be destroy or might be burn, because without resistor, the current that's flowing on your circuit will directly go on your output display Laughing

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Re: What is an LED matrix?

Post by vidal on Tue Sep 26, 2017 6:42 pm

is there a 3x3 LED matrix? ano po ung pinaka maliit na LED matrix? Smile

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Re: What is an LED matrix?

Post by ardeneil on Fri Sep 29, 2017 5:30 am

Meron pong 3x3 led matrix

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Re: What is an LED matrix?

Post by RTAGUDIN on Wed Oct 11, 2017 6:33 pm

This is such a big help. My microprocessor project is somehow related to this though I don't actually use a matrix. It gives me an idea how would I work on my circuit .

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Re: What is an LED matrix?

Post by Dezza on Thu Oct 12, 2017 7:12 pm

Jennielym wrote:it is possible to drive an LED matrix without a resistor?
The answer is POSSIBLE to drive an LED matrix without a resistor but there's a possibility that your LED may be destroyed because if you will attach a LED to a 5V power supply you will burn it instantly.

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Re: What is an LED matrix?

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