user61755: I have multiple LCD displays and one Arduino and I just want to show some text on each display separately.

Is it possible to Wiring multiple LCD Displays for the single Arduino board?
Or maximum how many display can I connect one single Arduino?

user4143: For HD44780 based displays all the data, register select and read/write pins can be shared. A display only exists at the moment the E pin is toggled. They are designed to share a microprocessor's data bus.
So if you have 50 displays then you can (theoretically, see "fan out" below) run them from 50 "E" pins plus 6 (or 10 depending on if you want to run in 4 or 8 bit mode) shared pins.
Here's an example with 2 displays in 4-bit mode - just replicate for more:

simulate this circuit – Schematic created using CircuitLab
Note: power, ground and contrast connections omitted for brevity.
As you can see the LCDs share all their pins except the E pin. A third display will connect to the same pins, except its E pin would be unique.
Fan out
Fan out is an important concept in digital electronics. An IO pin can only deliver a certain amount of current and each device a pin connects to adds "load" to that pin. Too many devices and the IO pin will struggle to control the devices properly.
To combat this a "bus transceiver" (such as the 74HC245) is commonly used. If one IO pin is capable of driving, for the sake of argument, 5 devices, and one bus transceiver is also capable of driving 5 devices then the IO pin could drive 5 bus transceivers giving you control over a potential 25 devices.

61755: <p>I have multiple LCD displays and one Arduino and I just want to show some text on each display separately.</p>
<p><a href="https://i.stack.imgur.com/unHfj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/unHfj.png" alt="enter image description here" /></a></p>
<p>Is it possible to Wiring multiple LCD Displays for the single Arduino board?</p>
<p>Or maximum how many display can I connect one single Arduino?</p>
 4143: <p>For HD44780 based displays all the data, register select and read/write pins can be shared. A display only exists at the moment the E pin is toggled. They are designed to share a microprocessor's data bus.</p>
<p>So if you have 50 displays then you can (theoretically, see &quot;fan out&quot; below) run them from 50 &quot;E&quot; pins plus 6 (or 10 depending on if you want to run in 4 or 8 bit mode) shared pins.</p>
<p>Here's an example with 2 displays in 4-bit mode - just replicate for more:</p>

<p><img src="https://i.stack.imgur.com/D3u0O.png" alt="schematic" /></p>

<p><sup><a href="/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2fD3u0O.png">simulate this circuit</a> &ndash; Schematic created using <a href="https://www.circuitlab.com/" rel="nofollow">CircuitLab</a></sup></p>
<p>Note: power, ground and contrast connections omitted for brevity.</p>
<p>As you can see the LCDs share all their pins except the E pin. A third display will connect to the same pins, except its E pin would be unique.</p>
<h2>Fan out</h2>
<p>Fan out is an important concept in digital electronics. An IO pin can only deliver a certain amount of current and each device a pin connects to adds &quot;load&quot; to that pin. Too many devices and the IO pin will struggle to control the devices properly.</p>
<p>To combat this a &quot;bus transceiver&quot; (such as the 74HC245) is commonly used. If one IO pin is capable of driving, for the sake of argument, 5 devices, and one bus transceiver is also capable of driving 5 devices then the IO pin could drive 5 bus transceivers giving you control over a potential 25 devices.</p>
